Patent Description:
An engine-generator set, which may be referred to as a generator or a genset, may include an engine and an alternator or another device for generating electrical energy or power. One or more generators may provide electrical power to a load through a power bus. The power bus, which may be referred to as a generator bus or common bus, transfers the electrical power from the engine-generator set to a load. In many examples, the electrical load on the engine-generator set may vary over time and challenges remain in providing an efficient generator that can adapt to varying loads. <CIT> discloses a hybrid inverter generator comprising generator, an engine and a battery. All components are arranged within a housing. <CIT> discloses a starter system for portable internal combustion engine electric generators using a portable universal battery pack. In order to facilitate starting the engine, the universal battery pack as known from cordless power tools can be inserted into a receptacle of the device in order to provide power to the starter.

The invention is defined in the independent Claims.

Exemplary embodiments are described herein with reference to the following drawings, according to an exemplary embodiment.

The following embodiments include an engine-generator set, which may be referred to as a generator or a genset, and may include an engine and an alternator. The alternator of the genset is an example electric machine. The alternator may include permanent magnets for the exciter of the generator or the main generator or the exciter. The generator may include a wound rotor generator with a permanent magnet exciter, the electrical machine may also act as a motor as well. Other embodiments of electrical machines include permanent magnet brush-type direct current (DC) machines, permanent magnet brushless DC machines, series-wound or universal machines, induction alternating current (AC) machines, synchronous AC machines, synchronous reluctance machines, switched reluctance machines, among others. Any machine may be used as a motor, selectively between a motor and a generator, or entirely as a generator.

It should be noted that while engine is used as a term to describe the prime mover converting fuel to a rotational speed and torque applied to a generator, any apparatus capable of providing mechanical torque and rotation or of requiring mechanical torque and rotation may be coupled to an electrical machine, operating as a motor or a generator. An electrical machine may also provide torque without causing rotation, such as to hold a position against a load. Thus, rotation is not required to define a device as an electrical machine. Further, the engine maybe be configured for a constant speed or a variable speed that varies based on the load. Likewise, the alternator may be included in a variable speed generator.

<FIG> illustrates an example portable generator <NUM>. The generator may be considered portable in that it is movable between various geographic locations. The generator may be transported via a truck or trailer. The generator may include a handle <NUM> and/or wheels <NUM>. The user may move the generator by grasping the handle <NUM> and pulling or pushing the generator along a surface on the wheels.

The generator <NUM> may comprise modular components (e.g., generator modules) that are attachable and removable from each other. The generator <NUM> may include a first generator module (e.g., engine module <NUM>) and a second generator module (e.g., inverter module <NUM>). The engine module <NUM> may include the engine and one or more additional components such as a fuel system, an exhaust system, a starter system, a coolant system or others. The inverter module <NUM> may include at least an alternator and may also include a battery or other storage device, an output system, and one or more coupling mechanisms. Additional, different, or fewer components may be included.

<FIG> illustrates an example portable generator having at least two separable generator modules including inverter module <NUM> and the engine module <NUM>.

The inverter module <NUM> may include a controller <NUM>, an inverter circuit <NUM>, a charging circuit <NUM>, and at least one battery <NUM>. The inverter module <NUM> may also include a coupling device including one or both of a mechanical coupling device <NUM> and an electrical coupling device <NUM>. The inverter module <NUM> may include an enclosure or housing that supported and encloses the battery <NUM>, the charging circuit, and the electric power outlet. The enclosure is detachable from the generator <NUM> as described herein. Additional, different, or fewer components may be included.

The output of the inverter module <NUM> may include an outlet <NUM>. As shown in <FIG>, the output of for the example portable generator <NUM> may include multiple types of outlets (e.g., first outlets <NUM>, second outlets <NUM>, and third outlets <NUM>). The outlets may have different shapes and sizes. The outlets may have different voltage ratings, current ratings, or other electrical parameters.

The inverter circuit <NUM> may be configured to convert electrical power stored in the battery <NUM> to an alternating current signal for the electric power outlet. The inverter circuit <NUM> is configured to change direct current (e.g., from the energy stored in the battery <NUM>) to alternating current for the output. The output may be a square wave, modified sine wave, pulsed sine wave, pulse width modulated wave or sine wave depending on circuit design.

The inverter circuit <NUM> may include an H-bridge having multiple transistor switches and one or more antiparallel diodes. The H-bridge may include four transistors or four transistor-diode pairs.

The inverter module <NUM> may include a charging circuit coupled to an output of a generator and configured to charge the battery <NUM>. The charging circuit may include an AC to DC converter. The charging circuit may include one or more diodes. The charging circuit may include a rectifier circuit, which may include four diodes and a smoothing capacitor.

The generator <NUM> may include a mechanical coupling device <NUM>. One side (e.g., connector <NUM>) of the mechanical coupling device <NUM> is on the inverter module <NUM> and the other side (e.g., connector <NUM>) of the mechanical coupling device <NUM> is on the engine module <NUM>. In addition, the wall mount may include a mechanical coupling device <NUM> configured to mate with another portion (e.g., connector <NUM>) of the mechanical coupling device <NUM> of the inverter module <NUM>.

The mechanical coupling device <NUM> may include a snap fit connection such as a tab and receiving hole. The tab is inserted into the receiving hole to secure the inverter module <NUM> to the engine module <NUM>. A release mechanism (e.g., release button) may be depressed to remove the tab from the receiving hole and detach the inverter module <NUM> from the engine module <NUM>. The mechanical coupling device <NUM> may include a first latch configured to secure the enclosure to the generator and a second latch configured to secure the enclosure to a mount. Other connections may include bolt and clevis pin, buckles, or other examples.

The mechanical coupling device <NUM> may align the inverter module <NUM> to the engine module <NUM> to attach and detach the generator and engine modules from each other in a first configuration. The mechanical coupling device <NUM> may align the inverter module <NUM> to the wall mount to attach and detach the inverter module <NUM> to an external circuit in a second configuration.

For example, different electrical connections may be made to the inverter module <NUM> depending on whether the inverter module <NUM> is in the first configuration or the second configuration. The generator <NUM> may include an electrical coupling device <NUM> including a generator output <NUM> on the engine module <NUM> side. On the inverter module <NUM> side, a first electrical contact <NUM> configured to connect the charging circuit to the alternator or the generator output <NUM> (e.g., via the charging circuit <NUM>) and a second electrical contact <NUM> configured to connect the battery <NUM> to the external circuit.

The inverter module <NUM> may include an electric power outlet configured to provide an output from the battery <NUM>, the generator, or a combination of the battery <NUM> and the generator. The controller <NUM> is configured to select a mode for the generator module. Example modes include a quiet mode, a maximum power mode, a no generator mode, and/or a hybrid mode. The controller <NUM> may select and cause the generator <NUM> to operate on a specific cycle.

In the quiet mode, the controller <NUM> may instruct the generator <NUM> (e.g., engine) only when the battery power has been depleted. Once, the battery power is no longer available, or below a predetermined threshold, the controller <NUM> instructs the generator <NUM> to resume operation. Thus, when possible, the generator <NUM> (e.g., engine) is not operated, which reduces noise when possible.

In the maximum power mode, the controller <NUM> may instruct the generator <NUM> (e.g., engine) to operate at all times, or any time there is a load on the generator.

In the no generator mode, the controller <NUM> may instruct the generator <NUM> (e.g., engine) to not operate. The engine may be turned off regardless of load and/or regardless of battery capacity.

<FIG> illustrates a circuit <NUM> to represent a hybrid mode of operation. In the hybrid mode, the controller <NUM> may instruct the engine to operate when the load is above a predetermined level (e.g., during a predetermined load condition). The predetermined level may be greater than both the rated output of the generator <NUM> and the output of the battery <NUM>. However, the predetermined level may be equal or less than the sum of the rated power of the generator <NUM> and the output of the battery <NUM>. <FIG> illustrates circuit <NUM> to represent a hybrid mode of operation in which the output of the inverter module <NUM> includes the sum of the output of the generator <NUM> and the output of the battery <NUM>.

<FIG> illustrates a circuit <NUM> to represent a remote mode of operation. In a wall mount mode (e.g., remote mode) of operation, the controller <NUM> may instruct the generator <NUM> (e.g., engine) to not operate. The wall mount mode corresponds to when the inverter module <NUM> is connected to the wall, and not coupled to the engine module <NUM>. The engine may be turned off regardless of load and/or regardless of battery capacity. Any available power is provided to the attached circuit from the battery <NUM>. <FIG> illustrates circuit <NUM> to represent a remote mode of operation and illustrates that the output of the battery <NUM> is the same as the output of the inverter module <NUM>.

In one example, the mode is determined by the controller <NUM> in response to sensor data. For example, a sensing circuit may generate sensor data indicative of the load on the generator. The load may be detected by measured electrical parameters at the output of the alternator. Example, electrical characteristics include power, current, and voltage. The load may be detected by measured electrical parameters at the field windings of the alternator. The amount of flux induced on the field coil by a current in the armature windings may be indicative of an output of the generator. Further, because a load on the generator impacts the current in the armature windings, the sensor data may be indicative of the load on the generator. The sensor data may be temperature data, which may indicate the resistance of the field coils or armature windings. The sensor data may be magnetic data measured on damper windings of the rotor, parallel or perpendicular to the primary rotor flux. The sensor data may describe a physical position of the rotor in any direction or a capacitance that is related to proximity to a surface, the sensor data may be acceleration data or strain data measured on the rotor, or the sensor data may be a deflection measurement on any axis or mode.

In one example, the mode is determined by the controller <NUM> in response to a user selection. That is, the user may provide input directly to the generator. One example is a user input device <NUM>. The user input device <NUM> may include a display, a touchscreen, a keypad, a button, or other device for providing the user selection to the controller <NUM>. The user input device <NUM> may include one or more indicators such as a batter level indicator configured to display the battery level or stored power in the inverter module <NUM>.

In one example, the mode is determined by the controller <NUM> in response to a time or day (e.g., calendar). Certain modes may be assigned to certain times of days, days of the week, or days of the year. For example, the quiet mode may be assigned to overnight hours such as <NUM> P. to <NUM> A.

<FIG> illustrates a wall mount for the output module. The wall mount includes a connector <NUM> for the mechanical coupling device <NUM> and an electrical connector <NUM> for the electrical coupling device <NUM>. The connector <NUM> attaches the inverter module <NUM> to the wall mount and the electrical connector <NUM> provides an electrical path from the output of the inverter module <NUM> to an electrical panel <NUM> including one or more circuit breakers <NUM>.

In some examples, as shown by <FIG> and <FIG> the inverter module <NUM> is connected to the electrical panel <NUM> and/or the home or building circuits via a transfer switch <NUM>. <FIG> illustrates an example home layout for the portable generator <NUM>. <FIG> illlustrates an example transfer switch <NUM> for the example home layout for the portable generator. The transfer switch <NUM> may include a detection circuit configured to detect that the inverter module <NUM> has been connected to the transfer switch <NUM> and/or that the utility has been disconnected or lost service. In response to the detection, the transfer switch <NUM> may switch power from being supplied by the home breaker circuit <NUM> to the invertor module <NUM> for a predetermined set of circuits. The predetermined set of circuits may include essential circuits (e.g., refrigeration, lights, medical equipment, etc.). The transfer switch <NUM> may include Silicon-controlled rectifiers (SCRs) to transfer the load of the predetermined set of circuits.

In some examples, as shown by <FIG>, the invertor module <NUM> is connected directed to the electrical panel <NUM> using a generator circuit breaker with integrated transfer switch.

<FIG> illustrates an example circuit breaker transfer switch <NUM>. The circuit breaker transfer switch <NUM> includes a selectable switch <NUM> and a current limiting switch <NUM>. The current limiting switch <NUM> is connected to the grid circuit and the load circuit.

The circuit breaker transfer switch <NUM> includes a first connection point <NUM>, a second connection point <NUM>, and a third connection point <NUM>. The first connection point <NUM> is electrically connected to a grid circuit. The second connection point <NUM> is electrically connected to a load circuit. The third connection point <NUM> is electrically connected to a generator circuit.

<FIG> illustrates example positions and indicators for the circuit breaker transfer switch <NUM>. <FIG> illustrates example connections for the circuit breaker transfer switch <NUM> in a side view of the circuit breaker transfer switch <NUM>.

The selectable switch <NUM> is connected to the load circuit and the generator circuit. The selectable switch <NUM> is configured for three positions including a first position in which the current limiting switch <NUM> is closed and the selectable switch <NUM> is open, a second position in which the current limiting switch <NUM> is open and the selectable switch <NUM> is closed, and a third position in which the current limiting switch <NUM> is open and the selectable switch <NUM> is open. The first position corresponds to utility operation, labeled "Grid" in <FIG>. The second position corresponds to generator operation, labeled "Gen" in <FIG>. The third position corresponds to an over current condition, labeled "Tripped" in <FIG>, in the home or building circuit.

The circuit breaker transfer switch <NUM> includes at least one indicator including a first status for the current limiting switch <NUM> and a second status for the selectable switch <NUM>.

The circuit breaker transfer switch <NUM> includes a connection outlet electrically connected to the third connection point and configured to receive a generator module, as described herein.

<FIG> illustrate the portable generator in various configurations that correspond to various modes of operation.

<FIG> illustrates an example circuit for the portable generator and the circuit breaker transfer switch <NUM> in a first configuration. In the first configuration, the inverter module <NUM> is connected to an indoor circuit outlet <NUM> for the circuit within the home or building. The circuit may have a corresponding circuit breaker transfer switch <NUM> within the panel <NUM>. The inverter module provides backup power to the indoor circuit outlet <NUM> and corresponding circuit, which may occur when the generator <NUM> is disconnected.

<FIG> illustrates an example circuit for the portable generator and the circuit breaker transfer switch in a second configuration. In the second configuration, the inverter module <NUM> is connected to the generator <NUM>. The inverter module <NUM> may be connected to outdoor circuit outlet <NUM>, which is connected to the same circuit within the home or the building as the indoor circuit outlet <NUM>. The inverter module provides backup power to the outdoor circuit outlet <NUM> and corresponding circuit.

<FIG> illustrates an example circuit for the portable generator and the circuit breaker transfer switch <NUM> in a third configuration. In the third configuration, the generator <NUM> is connectable to a secondary outlet <NUM>. The secondary outlet <NUM> may have a different size or shape than standard outlets. The secondary outlet <NUM> is coupled to the same indoor circuit that the inverter module <NUM> is connected to within the home or building. Therefore, the generator <NUM> may charge the battery <NUM> even when the inverter module <NUM> is mounted to the wall. In addition, the generator <NUM> and inverter module <NUM> may operate in the hybrid mode of operation, such that the circuit is provided with the sum of the output of the battery <NUM> and the generator, even with the generator located outside of the home or building and the inverter module located within the home or building.

<FIG> illustrates an example controller <NUM> for the portable generator system. The controller <NUM> may include a processor <NUM>, a memory <NUM>, and a communication interface <NUM> for interfacing with devices or to the internet and/or other networks <NUM>. In addition to the communication interface <NUM>. The components of the control system <NUM> may communicate using bus <NUM>.

Optionally, the control system <NUM> may include an input device <NUM> and/or a sensing circuit. The input device <NUM> may include the circuit breaker transfer switch <NUM>, a touchscreen coupled to or integrated with the circuit breaker transfer switch <NUM>, a keyboard, a microphone for voice inputs, a camera for gesture inputs, and/or another mechanism.

Optionally, the control system <NUM> may include a drive unit <NUM> for receiving and reading non-transitory computer media <NUM> having instructions <NUM>. Additional, different, or fewer components may be included. The processor <NUM> is configured to perform instructions <NUM> stored in memory <NUM> for executing the algorithms described herein. A display <NUM> may couple with the circuit breaker transfer switch <NUM>. The display <NUM> may be implemented via a mobile device such as a tablet or smartphone. The display <NUM> may be combined with the user input device <NUM>.

<FIG> illustrates a flow chart for the control system <NUM> for the operation of the portable generator system. The acts of the flow chart may be performed by any combination of the control system <NUM>, the network device or the server. Portions of one or more acts may be performed by the appliance. Additional, different of fewer acts may be included.

At act S101, the portable inverter module <NUM> is detached from the engine/generator. The engine/generator may be a portable generator (e.g., on wheels). The portable inverter module <NUM> may include an electrical connection to the engine/generator that provides electrical power from the engine/generator to the portable inverter module <NUM>. The portable inverter module <NUM> may include a first mechanical coupler that physically connects the portable inverter module <NUM> to the engine/generator. The first mechanical coupler may align the portable inverter module <NUM> may align the portable inverter module <NUM> and the engine/generator at a predetermined position so that the electrical connection is made. In order to detach the portable inverter module <NUM>, a latch, lever, or button may be depressed in order to decouple the first mechanical coupler.

At act S103, the portable inverter module <NUM> is attached to the wall mount and/or the external circuit via a second mechanical coupler. The portable inverter module <NUM> may be moved by the user (e.g., carried, lifted, etc.) from a first location of the engine/generator to a second location of the wall mount and/or external circuit. In some examples, the engine/generator is outdoors and the wall mount and/or external circuit is indoors.

At act S105, the controller <NUM> (e.g., through processor <NUM>) accesses a predetermined mode in response to the attachment of the inverter module to the wall mount and/or the external circuit. The predetermined mode may be a battery mode where one or more loads on the external circuit are provided power from the battery of the inverter module. At act S107, power is provided to the external circuit from the battery.

Processor <NUM> may be a general purpose or specific purpose processor, an application specific integrated circuit (ASIC), one or more programmable logic controllers (PLCs), one or more field programmable gate arrays (FPGAs), a group of processing components, or other suitable processing components. Processor <NUM> is configured to execute computer code or instructions stored in memory <NUM> or received from other computer readable media (e.g., embedded flash memory, local hard disk storage, local ROM, network storage, a remote server, etc.). The processor <NUM> may be a single device or combinations of devices, such as associated with a network, distributed processing, or cloud computing.

Memory <NUM> may include one or more devices (e.g., memory units, memory devices, storage devices, etc.) for storing data and/or computer code for completing and/or facilitating the various processes described in the present disclosure. Memory <NUM> may include random access memory (RAM), read-only memory (ROM), hard drive storage, temporary storage, non-volatile memory, flash memory, optical memory, or any other suitable memory for storing software objects and/or computer instructions.

The communication interface <NUM> may be connected to a network. The network may include wired networks (e.g., Ethernet), wireless networks, or combinations thereof. The wireless network may be a cellular telephone network, an <NUM>, <NUM>, <NUM>, or WiMax network, a Bluetooth pairing of devices, or a Bluetooth mesh network. Further, the network may be a public network, such as the Internet, a private network, such as an intranet, or combinations thereof, and may utilize a variety of networking protocols now available or later developed including, but not limited to TCP/IP based networking protocols.

While the computer-readable medium (e.g., memory <NUM>) is shown to be a single medium, the term "computer-readable medium" includes a single medium or multiple media, such as a centralized or distributed database, and/or associated caches and servers that store one or more sets of instructions. The term "computer-readable medium" shall also include any medium that is capable of storing, encoding or carrying a set of instructions for execution by a processor or that cause a computer system to perform any one or more of the methods or operations disclosed herein.

Claim 1:
A generator module (<NUM>) comprising:
a battery (<NUM>);
a charging circuit (<NUM>) coupled to an output of a generator (<NUM>) and configured to charge the battery (<NUM>);
an electric power outlet configured to provide an output from the battery (<NUM>), the generator (<NUM>), or a combination of the battery (<NUM>) and the generator (<NUM>); characterized by
an enclosure including the battery (<NUM>), the charging circuit (<NUM>), and the electric power outlet, the enclosure detachable from the generator (<NUM>).