Patent Description:
In the field of energy technologies, a charging technology for electric vehicles is always an important research direction of researchers. In addition to a charger and a battery that are related to charging, a plurality of motors are further mounted on the electric vehicle, for example, a motor that drives the vehicle to travel and a motor in an air conditioner compressor. These functional components on the electric vehicle are all separately distributed, resulting in a complex structure layout, a low integration level, a large volume, and high costs of the electric vehicle.

To increase the vehicle integration level, simplify the structure layout of the electric vehicle, and reduce the costs and volume of the electric <CIT> discloses a traction network for a vehicle, where the charging unit and the traction inverter are combined to enable efficient and high-power charging using shared power electronics components. vehicle, it is necessary to integrate a charging function and a motor drive function of the electric vehicle.

<CIT> discloses that a charging device for a motor vehicle, having a charging terminal for the energetic coupling to a motor-vehicle-external charging station, a high-voltage terminal for the electrical connection of the charging device to a high-voltage vehicle electrical system of the motor vehicle, and a charging device energy converter electrically coupled to the charging terminal and the high-voltage terminal.

Embodiments of this application provide an energy conversion apparatus, a motor, a power system, and a vehicle. The apparatus integrates a charging function and a motor drive function. When the apparatus is installed on an electric vehicle, a vehicle integration level can be increased, a structure layout of the electric vehicle can be simplified, and costs and a volume of the electric vehicle can be reduced. The first aspect and the third aspect to the fifth aspect as follows are not part of the invention and are provided for illustrative purposes to provide a better understanding of the invention.

According to a first aspect, an example of this application provides an energy conversion apparatus, including a three-phase bridge arm converter, a motor winding, a two-phase two-bridge-arm converter, and a transformer. A direct current port of the three-phase bridge arm converter is connected to a battery; an alternating current port of the three-phase bridge arm converter is connected to the motor winding; a direct current port of the two-phase two-bridge-arm converter is connected to the battery; an alternating current port of the two-phase two-bridge-arm converter is connected to a secondary-side winding of the transformer; and a primary-side winding of the transformer is connected to an alternating current charging port.

The energy conversion apparatus provided in the first aspect of this application may integrate a motor drive function by using the three-phase bridge arm converter and the motor winding, and integrate an alternating current charging function by using the two-phase two-bridge-arm converter and the transformer. In this way, the energy conversion apparatus can integrate the charging function and the motor drive function. When the energy conversion apparatus is installed on an electric vehicle, a vehicle integration level can be increased, a structure layout of the electric vehicle can be simplified, and costs and a volume of the electric vehicle can be reduced.

According to a second aspect, an embodiment of this application provides an energy conversion apparatus, including a three-phase bridge arm converter, a motor winding, and a transformer. A direct current port of the three-phase bridge arm converter is connected to a battery; an alternating current port of the three-phase bridge arm converter is connected to the motor winding; two bridge arms of the three-phase bridge arm converter are connected to a secondary-side winding of the transformer through a first switch group, and the first switch group is configured to control connection and disconnection between the transformer and the two bridge arms of the three-phase bridge arm converter; a second switch group is further disposed between the motor winding and the two bridge arms of the three-phase bridge arm converter, and the second switch group is configured to control connection and disconnection between the motor winding and the two bridge arms of the three-phase bridge arm converter; and a primary-side winding of the transformer is connected to an alternating current charging port.

The energy conversion apparatus provided in the second aspect of this application may integrate a motor drive function by using the three-phase bridge arm converter and the motor winding, implement an alternating current charging function by reusing the two bridge arms of the three-phase bridge arm converter, and implement conversion between a motor drive mode and an alternating current charging mode by using the first switch group and the second switch group. Therefore, the energy conversion apparatus can not only integrate the charging function and the motor drive function, but also reuse some circuits. This further increases an integration level and reduces a volume.

With reference to the second aspect, in an implementation provided in this embodiment of this application, the first switch group and the second switch group include a flip-flop K1 and a flip-flop K2; one end of the flip-flop K1 is connected to an alternating current port of a first bridge arm of a two-phase two-bridge-arm converter, and the other end of the flip-flop K1 includes two contacts respectively connected to the motor winding and a secondary-side winding of the transformer; and one end of the flip-flop K2 is connected to an alternating current port of a second bridge arm of the two-phase two-bridge-arm converter, and the other end of the flip-flop K2 includes two contacts respectively connected to the motor winding and the secondary-side winding of the transformer. In this implementation, functions of the first switch group and the second switch group are implemented by using two flip-flops. This further increases an integration level and reduces a volume.

According to a third aspect, an example of this application provides an energy conversion apparatus, including a three-phase bridge arm converter, a motor winding, a bridge arm circuit, and a transformer. A direct current port of the three-phase bridge arm converter is connected to a battery; an alternating current port of the three-phase bridge arm converter is connected to the motor winding; an alternating current port of one bridge arm of the three-phase bridge arm converter is further connected to a secondary-side winding of the transformer; a direct current port of the bridge arm circuit is connected to the battery; an alternating current port of the bridge arm circuit is connected to the secondary-side winding of the transformer; and a primary-side winding of the transformer is connected to an alternating current charging port.

The energy conversion apparatus provided in the third aspect of this application may integrate a motor drive function by using the three-phase bridge arm converter and the motor winding, and implement an alternating current charging function by using the bridge arm circuit and reusing the bridge arm of the three-phase bridge arm converter. Therefore, the energy conversion apparatus can not only integrate the charging function and the motor drive function, but also reuse some circuits. This further increases an integration level and reduces a volume.

With reference to the third aspect, in an implementation of this embodiment of this application, the bridge arm circuit is two capacitors connected in series, two diodes connected in series, or two switching transistors connected in series. This implementation provides a plurality of implementation solutions, so that the solutions provided in embodiments of this application are more comprehensive.

According to a fourth aspect, an example of this application provides an energy conversion apparatus, including a three-phase bridge arm converter, a motor winding, and a transformer. A direct current port of the three-phase bridge arm converter is connected to a battery; an alternating current port of the three-phase bridge arm converter is connected to the motor winding; an alternating current port of one bridge arm of the three-phase bridge arm converter is specifically connected to the motor winding through a first switch and connected to one end of a secondary-side winding of the transformer through a second switch; the other end of the secondary-side winding of the transformer is connected to a busbar end of the motor winding through a third switch; and a primary-side winding of the transformer is connected to an alternating current charging port.

The energy conversion apparatus provided in the fourth aspect of this application may integrate a motor drive function by using the three-phase bridge arm converter and the motor winding, and implement an alternating current charging function by reusing three bridge arms of the three-phase bridge arm converter as a converter. Therefore, the energy conversion apparatus can not only integrate the charging function and the motor drive function, but also reuse some circuits. This further increases an integration level and reduces a volume.

With reference to the fourth aspect, in an implementation of this embodiment of this application, the first switch and the second switch are specifically a flip-flop K3; and one end of the flip-flop K3 is connected to the alternating current port of the bridge arm of the three-phase bridge arm converter, and the other end of the flip-flop K3 includes two contacts respectively connected to one winding in the motor winding and the end of the secondary-side winding of the transformer. In this implementation, functions of the first switch and the second switch are implemented by using one flip-flop. This further increases an integration level and reduces a volume.

According to a fifth aspect, an example of this application provides an energy conversion apparatus, including a three-phase bridge arm converter, a motor winding, a bridge arm circuit, and a transformer. A direct current port of the three-phase bridge arm converter is connected to a battery; an alternating current port of the three-phase bridge arm converter is connected to the motor winding; a direct current port of the bridge arm circuit is connected to the battery, and an alternating current port of the bridge arm circuit is connected to one end of a secondary-side winding of the transformer; the other end of the secondary-side winding of the transformer is connected to a busbar end of the motor winding through a third switch; and a primary-side winding of the transformer is connected to an alternating current charging port.

The energy conversion apparatus provided in the fifth aspect of this application may integrate a motor drive function by using the three-phase bridge arm converter and the motor winding, and implement an alternating current charging function by using the bridge arm circuit and reusing the three-phase bridge arm converter and the motor winding. Therefore, the energy conversion apparatus can not only integrate the charging function and the motor drive function, but also reuse some circuits. This further increases an integration level and reduces a volume.

With reference to the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect, in an implementation of embodiments of this application, a fourth switch is disposed between the primary-side winding of the transformer and the alternating current charging port, and is configured to control connection and disconnection between the primary-side winding of the transformer and the alternating current charging port. In this implementation, the connection and disconnection between the primary-side winding of the transformer and the alternating current charging port are controlled by using the fourth switch, so that the solutions provided in embodiments of this application are more comprehensive.

With reference to the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect, in an implementation of embodiments of this application, an alternating current filter is disposed between the primary-side winding of the transformer and the alternating current charging port. In this implementation, an alternating current that is input from the alternating current charging port is filtered by using the alternating current filter, so that the solutions provided in embodiments of this application are more comprehensive.

With reference to the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect, in an implementation of embodiments of this application, the transformer is specifically a power frequency transformer. In this implementation, the power frequency transformer is used as the transformer, so that the solutions provided in embodiments of this application are more comprehensive.

According to a sixth aspect, an embodiment of this application provides a motor. The motor includes a housing, and the energy conversion apparatus according to the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect is accommodated in the housing.

According to a seventh aspect, an embodiment of this application provides a power system, including a motor and the energy conversion apparatus according to the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect. A motor winding of the energy conversion apparatus is configured to drive the motor.

According to an eighth aspect, an embodiment of this application provides a vehicle, including the energy conversion apparatus according to the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect, the motor according to the sixth aspect, or the power system according to the seventh aspect.

Embodiments of this application provide an energy conversion apparatus, a motor, a power system, and a vehicle. The apparatus integrates a charging function and a motor drive function. When the apparatus is installed on an electric vehicle, a vehicle integration level can be increased, a structure layout of the electric vehicle can be simplified, and costs and a volume of the electric vehicle can be reduced.

In the specification, claims, and accompanying drawings of this application, the terms "first", "second", "third", "fourth", and the like (if existent) are intended to distinguish between similar objects but do not necessarily indicate a specific order or sequence. It should be understood that the data termed in such a way are interchangeable in proper circumstances, so that embodiments described herein can be implemented in an order other than the order illustrated or described herein. Moreover, the terms "include", "correspond to" and any other variants mean to cover the non-exclusive inclusion, for example, a process, method, system, product, or device that includes a list of steps or units is not necessarily limited to those expressly listed steps or units, but may include other steps or units not expressly listed or inherent to such a process, method, system, product, or device.

In embodiments of this application, words such as "example" or "for example" are used to indicate examples, instances, or descriptions. Any embodiment or solution described as "example" or "for example" in embodiments of this application is not to be construed as being more preferred or advantageous than other embodiments or solutions. Exactly, use of the word "example" or "for example" or the like is intended to present a relative concept in a specific manner.

For clear and brief description of the following embodiments, a related technology is briefly described first.

There are usually two types of solutions for integration of a charging function and a motor drive function of an electric vehicle. One type of solution is a non-isolated-type integrated charging solution, and non-isolated-type charging means that no transformer is used for isolation between a charging port and a high-voltage battery. To be specific, in this charging solution, the high-voltage battery and the charging port have a direct electrical connection relationship. Consequently, there is a safety risk. At present, this non-isolated-type charging solution is basically not used on the electric vehicle.

The other type of solution is an isolated-type integrated charging solution. To be specific, at least one transformer is used for isolation on a transformer circuit between a charging port and a high-voltage battery. After input from an alternating current port, rectification is performed and then a voltage is boosted. Subsequently, a next converter performs isolated conversion to charge the high-voltage battery. In this isolated-type charging solution, both a separate charging solution and an integrated charging solution are main forms of electric vehicle charging at present.

However, in a current solution, an integration level is relatively low, costs are relatively high, and a volume is relatively large. An embodiment of this application provides an energy conversion apparatus. The apparatus integrates a charging function and a motor drive function. When the apparatus is installed on an electric vehicle, a vehicle integration level can be increased, a structure layout of the electric vehicle can be simplified, and costs and a volume of the electric vehicle can be reduced.

<FIG> is a schematic diagram of an energy conversion apparatus according to an embodiment of this application. The embodiment corresponding to <FIG> is not part of the invention, but only for further understanding the invention. The energy conversion apparatus integrates a charging function and a motor drive function. The energy conversion apparatus includes a three-phase bridge arm converter <NUM>, a motor winding <NUM>, a two-phase two-bridge-arm converter <NUM>, and a transformer <NUM>. A direct current port of the three-phase bridge arm converter <NUM> is connected to a battery <NUM>, an alternating current port of the three-phase bridge arm converter <NUM> is connected to the motor winding <NUM>, a primary-side winding of the transformer <NUM> is connected to an alternating current charging port <NUM>, a secondary-side winding of the transformer <NUM> is connected to an alternating current port of the two-phase two-bridge-arm converter <NUM>, and a direct current port of the two-phase two-bridge-arm converter <NUM> is connected to the direct current port of the three-phase bridge arm converter <NUM>. The following describes components of the energy conversion apparatus in detail.

In this embodiment of this application, two ends of the battery <NUM> each may be used as an output port or an input port.

In this embodiment of this application, the battery <NUM> may be specifically a high-voltage battery. With development of electric vehicle technologies, a requirement for long endurance is increasingly high. Therefore, a higher requirement is imposed on a battery capacity, and a battery voltage is also increasingly high. Therefore, high-voltage batteries are used for more electric vehicles to provide energy for traveling of the vehicles. The battery <NUM> in this embodiment of this application may be a high-voltage battery, and is applicable to an electric vehicle with a higher requirement.

In this embodiment of this application, the three-phase bridge arm converter <NUM> may be specifically a three-phase three-bridge-arm converter, a three-phase four-bridge-arm converter, or the like. This is not limited in this embodiment of this application. For example, when the three-phase bridge arm converter <NUM> is a three-phase three-bridge-arm converter, the three-phase bridge arm converter <NUM> includes three bridge arms, and each bridge arm may be two switching transistors connected in series. A port for connecting the three bridge arms in parallel is the direct current port of the three-phase bridge arm converter <NUM>, and is configured to connect to a direct current device. In this embodiment of this application, the direct current port of the three-phase bridge arm converter <NUM> is connected to the battery <NUM>. Intermediate end points of the three bridge arms are three alternating current ports of the three-phase bridge arm converter <NUM>, and are configured to connect to the motor winding <NUM>. When an alternating current passes through the motor winding <NUM>, a corresponding motor is driven.

In some embodiments, a switching transistor used for the three-phase bridge arm converter <NUM> may be a transistor connected to a diode in parallel, a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), or the like. This is not limited in embodiments of this application.

In this embodiment of this application, the two-phase two-bridge-arm converter <NUM> may include two bridge arms, and each bridge arm may include two switching transistors connected in series. A parallel connection end of the two bridge arms is the direct current port of the two-phase two-bridge-arm converter <NUM>. The direct current port of the two-phase two-bridge-arm converter <NUM> may be connected to the battery <NUM>. Intermediate end points of the two bridge arms are two alternating current ports of the two-phase two-bridge-arm converter <NUM>. The two alternating current ports of the two-phase two-bridge-arm converter <NUM> are connected to two ends of the secondary-side winding of the transformer <NUM>.

In some embodiments, a power factor correction (PFC) inductor is further connected in series between one alternating current port of the two-phase two-bridge-arm converter <NUM> and the secondary-side winding of the transformer <NUM>, and is configured to cooperate with the two-phase two-bridge-arm converter <NUM> to implement a boost function.

In this embodiment of this application, a switching transistor used for the two-phase two-bridge-arm converter <NUM> may be a transistor connected to a freewheeling diode in parallel, an MOS transistor, an IGBT, or the like. This is not limited in this embodiment of this application. A type of the switching transistor used for the two-phase two-bridge-arm converter <NUM> may be the same as or different from a type of the switching transistor used for the three-phase bridge arm converter <NUM>. This is not limited in this embodiment of this application.

In this embodiment of this application, the motor winding <NUM> is a winding of a motor on an electric vehicle. Specifically, the motor winding <NUM> may be a stator winding.

The motor in this embodiment of this application may be a motor that drives the vehicle to travel on the electric vehicle, or may be a motor in a compressor used by an air conditioner on the electric vehicle. Certainly, another similar motor is also included in the motor in this embodiment of this application. A type of the motor is not limited in this embodiment of this application. Actually, because a power of the air conditioner compressor is equivalent to that of an alternating current charger of the electric vehicle, higher utilization can be achieved by integrating the charger and the compressor.

In this embodiment of this application, the transformer <NUM> may be a power frequency transformer, and is configured to isolate the alternating current charging port <NUM> from the battery <NUM>, so that the alternating current charging port <NUM> and the battery <NUM> are not directly electrically connected. This is safer.

In this embodiment of this application, the two ends of the secondary-side winding of the transformer <NUM> are connected to the two alternating current ports of the two-phase two-bridge-arm converter <NUM>, and the primary-side winding of the transformer <NUM> is connected to the alternating current charging port <NUM>, to isolate an alternating current that is input from the alternating current charging port <NUM> and then transmit the alternating current to the two-phase two-bridge-arm converter <NUM>. Then, the two-phase two-bridge-arm converter <NUM> may convert the alternating current into a direct current and transmit the direct current to the battery <NUM>, to charge the battery <NUM>.

In this embodiment of this application, mutual interference between a winding of the transformer <NUM> and a winding of the motor winding <NUM> should be avoided as much as possible. However, in some embodiments, the transformer <NUM> and the motor winding <NUM> are integrated into one motor together, and are relatively close to each other. Therefore, an embodiment of this application provides an integration manner, as shown in <FIG>, which is not part of the invention, but only for further understanding the invention. to avoid mutual interference between the winding of the transformer <NUM> and the winding of the motor winding <NUM>. <FIG> is a schematic diagram of an integration manner according to an embodiment of this application. A motor stator corresponding to the motor winding <NUM> is disposed coaxially with a transformer iron core corresponding to the transformer <NUM> in an aligned manner. The motor winding is wound on the motor stator, and the primary-side winding and the secondary-side winding of the transformer <NUM> are wound on the transformer iron core. In this case, interference between the winding of the transformer <NUM> and the winding of the motor winding <NUM> is relatively weak.

In some embodiments, an alternating current filter <NUM> is disposed between the primary-side winding of the transformer <NUM> and the alternating current charging port <NUM>, and is configured to perform filtering on an alternating current that is input from the alternating current charging port <NUM>. The alternating current filter <NUM> is similar to a conventional alternating current filter device.

In some embodiments, a switch <NUM> is disposed between the primary-side winding of the transformer <NUM> and the alternating current charging port <NUM> to implement connection or disconnection between the energy conversion apparatus and the alternating current charging port <NUM>. As shown in <FIG>, the switch <NUM> may be disposed between one end of the primary-side winding of the transformer <NUM> and one port of the alternating current charging port <NUM>. It may be understood that both the alternating current filter <NUM> and the switch <NUM> may be disposed between the primary-side winding of the transformer <NUM> and the alternating current charging port <NUM>.

In this embodiment of this application, the alternating current charging port <NUM> is configured to connect to a power grid or connect to an alternating current charging pile. For example, after the alternating current charging port <NUM> is connected to the alternating current charging pile, electric energy in the alternating current charging pile may be input to the energy conversion apparatus through the alternating current charging port <NUM>, to charge the battery <NUM>.

It may be understood that the alternating current charging port <NUM> may be in a shape of a standard charging port, or may be in a form of a fast charging port. In addition, a protocol supported by the alternating current charging port <NUM> may be a standard charging protocol or a fast charging protocol of electric vehicles. In this embodiment of this application, a shape, a size, a supported protocol, and the like of the alternating current charging port <NUM> are not limited.

In this embodiment of this application, the alternating current filter <NUM> may be disposed between the alternating current charging port <NUM> and the transformer <NUM>. The alternating current filter <NUM> is similar to another alternating current filter device.

In this embodiment of this application, the switch <NUM> may be disposed between the alternating current charging port <NUM> and the transformer <NUM>, to control connection and disconnection between the alternating current charging port <NUM> and the transformer <NUM>.

In this embodiment of this application, both the alternating current filter <NUM> and the switch <NUM> may be disposed. This is not limited in this embodiment of this application.

<FIG> is a schematic diagram of another energy conversion apparatus according to an embodiment of this application. The energy conversion apparatus includes a battery <NUM>, a three-phase bridge arm converter <NUM>, a motor winding <NUM>, a transformer <NUM>, and an alternating current charging port <NUM>. A direct current port of the three-phase bridge arm converter <NUM> is connected to the battery <NUM>, an alternating current port of the three-phase bridge arm converter <NUM> is connected to the motor winding <NUM>, a primary-side winding of the transformer <NUM> is connected to the alternating current charging port <NUM>, and a secondary-side winding of the transformer <NUM> is connected to two bridge arms of the three-phase bridge arm converter <NUM>. The following describes components of the energy conversion apparatus in detail.

In this embodiment of this application, the battery <NUM> is similar to the battery <NUM> in the foregoing embodiments corresponding to <FIG>, and details are not described herein again.

In this embodiment of this application, the three-phase bridge arm converter <NUM> is specifically a three-phase three-bridge-arm converter, a three-phase four-bridge-arm converter, or the like. This is not limited in this embodiment of this application. For example, when the three-phase bridge arm converter <NUM> is a three-phase three-bridge-arm converter, the three-phase bridge arm converter <NUM> includes three bridge arms, and each bridge arm is two switching transistors connected in series. A port for connecting the three bridge arms in parallel is the direct current port of the three-phase bridge arm converter <NUM>, and is configured to connect to a direct current device. In this embodiment of this application, the direct current port of the three-phase bridge arm converter <NUM> is connected to the battery <NUM>. Intermediate end points of the three bridge arms are three alternating current ports of the three-phase bridge arm converter <NUM>, and are configured to connect to the motor winding <NUM>. When an alternating current passes through the motor winding <NUM>, a corresponding motor is driven.

In some embodiments, a switching transistor used for the three-phase bridge arm converter <NUM> is a transistor connected to a diode in parallel, a metal-oxide-semiconductor field-effect transistor (MOSFET), an IGBT, or the like. This is not limited in embodiments of this application.

In addition, in this embodiment of this application, the two bridge arms of the three-phase bridge arm converter <NUM> is further used as two bridge arms of an inverter, that is, the two bridge arms of the three-phase bridge arm converter <NUM> is connected to the secondary-side winding of the transformer <NUM>, to invert a direct current at the direct current port to an alternating current and transmit the alternating current to the transformer <NUM>. Therefore, the three-phase bridge arm converter <NUM> in this embodiment of this application has two functions: One is to serve as a three-phase inverter by using the three bridge arms to provide electric energy for the motor winding <NUM>, and the other is to serve as a two-phase inverter to deliver electric energy to the transformer <NUM>. In actual application, the three-phase bridge arm converter <NUM> provides optionality for the foregoing two functions by using two switch groups (a first switch group <NUM> and a second switch group <NUM>). As shown in <FIG>, the two bridge arms of the three-phase bridge arm converter <NUM> is connected to the secondary-side winding of the transformer <NUM> through the first switch group <NUM>, and connected to the motor winding <NUM> (which is specifically two windings of the motor winding <NUM>) through the second switch group <NUM>.

In the embodiment of <FIG>, when the energy conversion apparatus is in an alternating current charging mode, the first switch group <NUM> is connected, and the second switch group <NUM> is disconnected. After alternating current power that is input from the alternating current charging port <NUM> is transformed by using the transformer <NUM>, the alternating current power is converted into direct current power by using the first switch group <NUM> and the two bridge arms of the three-phase bridge arm converter <NUM>, to charge the battery <NUM>. In addition, because the second switch group <NUM> is disconnected, a current on the three-phase bridge arm converter <NUM> does not affect the motor winding <NUM>. When the alternating current charging port <NUM> is not connected to a charging pile but connected to an electric device, electric energy in the battery <NUM> is converted into an alternating current by using the two bridge arms of the three-phase bridge arm converter <NUM>, to charge/supply power to the device connected to the alternating current charging port <NUM>. When the energy conversion apparatus is in a motor drive mode, the first switch group <NUM> is disconnected, and the second switch group <NUM> is connected. In this case, electric energy in the battery <NUM> is transmitted to the motor winding <NUM> through the three-phase bridge arm converter <NUM> and the second switch group <NUM>. Because the first switch group <NUM> is disconnected, electric energy that is input from the alternating current charging port cannot enter the three-phase bridge arm converter <NUM>.

In some other embodiments, in the energy conversion apparatus, the first switch group <NUM> and the second switch group <NUM> is replaced with a flip-flop K1 and a flip-flop K2, as shown in <FIG>. An alternating current port of a leftmost bridge arm of the three-phase bridge arm converter <NUM> is connected to one end of the flip-flop K1, and the other end of the flip-flop K1 has two contacts respectively connected to a leftmost winding of the motor winding <NUM> and the secondary-side winding of the transformer <NUM>. An alternating current port of a rightmost bridge arm of the three-phase bridge arm converter <NUM> is connected to one end of the flip-flop K2, and the other end of the flip-flop K2 has two contacts respectively connected to a rightmost winding of the motor winding <NUM> and the secondary-side winding of the transformer <NUM>. In <FIG>, when the energy conversion apparatus is in an alternating current charging mode, and the flip-flop K1 and the flip-flop K2 each are in contact with by using an upper contact, the alternating current ports of the left and right bridge arms of the three-phase bridge arm converter <NUM> are connected to the secondary-side winding of the transformer <NUM>. After alternating current power that is input from the alternating current charging port <NUM> is transformed by using the transformer <NUM>, the alternating current power is converted into direct current power by using the flip-flop K1, the flip-flop K2, and the three-phase bridge arm converter <NUM>, to charge the battery <NUM>. When the alternating current charging port <NUM> is not connected to a charging pile but connected to an electric device, electric energy in the battery <NUM> is converted into an alternating current by using the two bridge arms of the three-phase bridge arm converter <NUM>, to charge/supply power to the device connected to the alternating current charging port <NUM>. In another case, when the energy conversion apparatus is in a motor drive mode, and the flip-flop K1 and the flip-flop K2 each are in contact with by using a lower contact, the alternating current ports of the left and right bridge arms of the three-phase bridge arm converter <NUM> are connected to the motor winding <NUM>, and an alternating current port of a middle bridge arm of the three-phase bridge arm converter <NUM> is also connected to the motor winding <NUM>. Therefore, electric energy that is output from the battery <NUM> can be transmitted to the motor winding <NUM> through the three-phase bridge arm converter <NUM>, to drive a motor.

In the embodiment corresponding to <FIG>, the alternating current charging port <NUM> is further specifically connected to the primary-side winding of the transformer <NUM> through an alternating current filter <NUM> and a flip-flop K3. The alternating current filter <NUM> and the flip-flop K3 are similar to the alternating current filter <NUM> and the switch <NUM> in the foregoing embodiments corresponding to <FIG>, and details are not described herein again.

In this embodiment of this application, the flip-flop K1 and the flip-flop K2 each is replaced with a single-pole double-throw switch, and the flip-flop K3 is also replaced with another switch. This is not limited in this embodiment of this application.

<FIG> is a schematic diagram of another energy conversion apparatus according to an embodiment of this application. The embodiment corresponding to <FIG> is not part of the invention, but only for further understanding the invention. The energy conversion apparatus includes a battery <NUM>, a three-phase bridge arm converter <NUM>, a bridge arm circuit <NUM>, a motor winding <NUM>, a transformer <NUM>, and an alternating current charging port <NUM>. The battery <NUM> is similar to the battery <NUM> in the foregoing embodiments corresponding to <FIG>, and details are not described herein again. A connection between the three-phase bridge arm converter <NUM> and the motor winding <NUM> is similar to the connection between the three-phase bridge arm converter <NUM> and the motor winding <NUM> in the foregoing embodiments corresponding to <FIG>.

In this embodiment of this application, one bridge arm (which is a leftmost bridge arm in the example in <FIG>, or may be another bridge arm in actual application, where this is not limited in this embodiment of this application) of the three-phase bridge arm converter <NUM> is further connected to a secondary-side winding of the transformer <NUM>.

In this embodiment of this application, a direct current port of the bridge arm circuit <NUM> is connected to a direct current port of the three-phase bridge arm converter <NUM> in parallel, and an alternating current port of the bridge arm circuit <NUM> is connected to the secondary-side winding of the transformer <NUM>. In some embodiments, the bridge arm circuit <NUM> includes two switching transistors connected in series. As shown in <FIG>, the bridge arm circuit <NUM> includes transistors. In actual application, the bridge arm circuit <NUM> may alternatively include diodes connected in series, as shown in <FIG>. Alternatively, the bridge arm circuit <NUM> may include capacitors connected in series, as shown in <FIG>.

The energy conversion apparatus provided in this embodiment of this application may implement an alternating current charging mode. To be specific, alternating current power that is input from the alternating current charging port <NUM> may be rectified by using one bridge arm of the three-phase bridge arm converter <NUM> and the bridge arm circuit <NUM>, and direct current power is output to the battery <NUM>, to charge the battery <NUM>.

The energy conversion apparatus provided in this embodiment of this application may implement a motor drive mode. To be specific, the battery <NUM> outputs direct current power to the three-phase bridge arm converter <NUM>, the direct current power is inverted into three-phase alternating current power, and the three-phase alternating current power is transmitted to the motor winding <NUM>, to drive a motor.

The energy conversion apparatus provided in embodiments corresponding to <FIG> and <FIG> may implement an inversion mode. To be specific, direct current power that is output from the battery <NUM> may be inverted by using one bridge arm of the three-phase bridge arm converter <NUM> and the bridge arm circuit <NUM>, and output to the alternating current charging port <NUM>, to charge/supply power to a device connected to the alternating current charging port <NUM>.

In actual application, in embodiments corresponding to <FIG>, and <FIG>, an appropriate switch (such as a flip-flop or a relay) may be disposed in a related connection place to control switching between the foregoing modes. This is not limited in embodiments of this application.

In embodiments corresponding to <FIG>, and <FIG>, the alternating current charging port <NUM> may further be specifically connected to the transformer <NUM> through an alternating current filter <NUM> and a flip-flop <NUM>. The alternating current filter <NUM> and the flip-flop <NUM> are similar to the alternating current filter <NUM> and the switch <NUM> in the foregoing embodiments corresponding to <FIG>, and details are not described herein again.

<FIG> is a schematic diagram of another energy conversion apparatus according to an embodiment of this application. The embodiment corresponding to <FIG> is not part of the invention, but only for further understanding the invention. The energy conversion apparatus includes a battery <NUM>, a three-phase bridge arm converter <NUM>, a motor winding <NUM>, a transformer <NUM>, and an alternating current charging port <NUM>. The battery <NUM> is similar to the battery <NUM> in the foregoing embodiments corresponding to <FIG>, and details are not described herein again. A connection between the three-phase bridge arm converter <NUM> and the motor winding <NUM> is similar to that in the related description in the foregoing embodiments corresponding to <FIG>.

In this embodiment of this application, a busbar end of the motor winding <NUM> is further connected to a secondary-side winding of the transformer <NUM> through a switch K2. In actual application, the switch K2 may be a flip-flop, a relay, or the like. This is not limited in this embodiment of this application. In addition, an alternating current port of a rightmost bridge arm of the three-phase bridge arm converter <NUM> is connected to the motor winding <NUM> and the secondary-side winding of the transformer <NUM> through a switch K1. Specifically, one end of the switch K1 is connected to the alternating current port of the rightmost bridge arm of the three-phase bridge arm converter <NUM>, and the other end has two contacts respectively connected to the motor winding <NUM> and the secondary-side winding of the transformer <NUM>. The switch K1 may be a flip-flop, a single-pole double-throw switch, or the like. This is not limited in this embodiment of this application.

The alternating current charging port <NUM> may further be specifically connected to a primary-side winding of the transformer <NUM> through an alternating current filter <NUM> and a flip-flop K3. The alternating current filter <NUM> and the flip-flop K3 are similar to the alternating current filter <NUM> and the switch <NUM> in the foregoing embodiments corresponding to <FIG>, and details are not described herein again.

When the energy conversion apparatus shown in <FIG> runs in an alternating current charging mode, the switch K1 is connected to an upper contact, the switch K2 is closed, and the switch K3 is closed. In this case, alternating current power that is input from the alternating current charging port <NUM> may be transformed by using the transformer <NUM> and then rectified into direct current power by using the left bridge arm, the middle bridge arm, and the right bridge arm of the three-phase bridge arm converter <NUM>, and the direct current power is delivered to the battery <NUM>, to charge the battery <NUM>. In this case, when the alternating current charging port <NUM> is not connected to a charging pile but connected to an electric device, electric energy in the battery <NUM> may be converted into an alternating current by using the three-phase bridge arm converter <NUM>, to charge/supply power to the device connected to the alternating current charging port <NUM>.

When the energy conversion apparatus shown in <FIG> runs in a motor drive mode, the switch K1 is connected to a lower contact, the switch K2 is disconnected, and the switch K3 is disconnected. In this case, electric energy that is output from the battery <NUM> is output to the motor winding <NUM> through the three-phase bridge arm converter <NUM>, to drive a motor.

In this embodiment of this application, when a left winding and a middle winding of the motor winding <NUM> are in the alternating current charging mode, a function of an energy storage inductor (which may also be referred to as a power factor correction (PFC) inductor) can be implemented. In the motor drive mode, a winding of the motor winding <NUM> is used as a winding for driving a motor according to a conventional solution. Therefore, in this embodiment of this application, not only the bridge arm of the three-phase bridge arm converter <NUM> is reused, but also the winding of the motor winding <NUM> is reused. This further increases an integration level and reduces a volume of the energy conversion apparatus.

In this embodiment of this application, a direct current port of the bridge arm circuit <NUM> is connected to the battery <NUM>, and an alternating current port of the bridge arm circuit <NUM> is connected to a secondary-side winding of the transformer <NUM>. Specifically, one end of the secondary-side winding of the transformer <NUM> is connected to a busbar end of the motor winding <NUM> through a switch K2, and the other end of the secondary-side winding of the transformer <NUM> is connected to the alternating current port of the bridge arm circuit <NUM>.

It may be understood that the bridge arm circuit <NUM> may include switching transistors, diodes, or capacitors that are connected in series. This is not limited in this embodiment of this application.

In this embodiment of this application, the alternating current charging port <NUM> may further be specifically connected to a primary-side winding of the transformer <NUM> through an alternating current filter <NUM> and a flip-flop K3. The alternating current filter <NUM> and the switch K3 are similar to the alternating current filter <NUM> and the switch <NUM> in the foregoing embodiments corresponding to <FIG>, and details are not described herein again.

In this embodiment of this application, the switch K2 and the switch K3 each may be a flip-flop, a relay, or the like. This is not limited in this embodiment of this application.

When the energy conversion apparatus shown in <FIG> runs in an alternating current charging mode, the switch K2 and the switch K3 are closed. Alternating current power that is input from the alternating current charging port <NUM> is transformed (voltage-up or voltage-down) by using the transformer <NUM> and then rectified into direct current power by using three bridge arms of the three-phase bridge arm converter <NUM> and the bridge arm circuit <NUM>, and the direct current power is delivered to the battery <NUM>, to charge the battery <NUM>. In this case, when the alternating current charging port <NUM> is not connected to a charging pile but connected to an electric device, electric energy in the battery <NUM> may be converted into an alternating current by using the three-phase bridge arm converter <NUM> and the bridge arm circuit <NUM>, to charge/supply power to the device connected to the alternating current charging port <NUM>.

When the energy conversion apparatus shown in <FIG> runs in a motor drive mode, the switch K2 and the switch K3 are disconnected. Direct current power that is output from the battery <NUM> is delivered to the motor winding <NUM> through the three-phase bridge arm converter <NUM>, to drive a motor.

It may be understood that, when the energy conversion apparatus is in the alternating current charging mode, the energy conversion apparatus reuses the bridge arm of the three-phase bridge arm converter <NUM> and the winding of the motor winding <NUM>. This increases an integration level and reduces a volume of the energy conversion apparatus.

An embodiment of this application further provides a motor. The motor includes a housing, and the energy conversion apparatus shown in <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, or <FIG> is accommodated in the housing.

An embodiment of this application further provides a power system, including a motor and the energy conversion apparatus shown in <FIG>. A motor winding of the energy conversion apparatus is configured to drive the motor.

An embodiment of this application further provides a vehicle, including the energy conversion apparatus shown in <FIG>, or including the foregoing power system.

It may be clearly understood by a person skilled in the art that, for purpose of convenient and brief description, for a detailed working process of the foregoing system, apparatus, and unit, refer to a corresponding process in the foregoing method embodiments, and details are not described herein again.

Claim 1:
An energy conversion apparatus, comprising a three-phase bridge arm converter (<NUM>), a motor winding (<NUM>), and a transformer (<NUM>), wherein
a direct current port of the three-phase bridge arm converter is connected to a battery (<NUM>); each of three alternating current ports of the three-phase bridge arm converter (<NUM>) is connected to the motor winding (<NUM>);
two bridge arms of the three-phase bridge arm converter (<NUM>) are connected to a secondary-side winding of the transformer (<NUM>) through a first switch group (<NUM>), and the first switch group is configured to control connection and disconnection between the transformer and the two bridge arms of the three-phase bridge arm converter;
a second switch group (<NUM>) is further disposed between the motor winding (<NUM>) and the two bridge arms of the three-phase bridge arm converter (<NUM>), and the second switch group (<NUM>) is configured to control connection and disconnection between the motor winding (<NUM>) and the two bridge arms of the three-phase bridge arm converter (<NUM>); and
a primary-side winding of the transformer (<NUM>) is connected to an alternating current charging port (<NUM>).