Patent ID: 12237671

Reference signs:1. Battery;2. Auxiliary Device;201. Battery Interface;202. Protection Circuit;203. Selector;204. Internal Load;205. Boost-buck Chip;206. Digital-to-analog Converter;207. First Switch transistor;208. USB-PD Power Interface;209. Power Bus;210. Control Bus;211. LDO Regulator Chip;212. PD Protocol Chip;213. Second Switch transistor;3. Photographic Device;4. External Power Source.

DETAILED DESCRIPTION

To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and apparently, the described embodiments are not all but a part of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

First Embodiment

The drawing shows a schematic diagram of an exemplary operating environment in which an embodiment of the present application can be implemented. The operating environment includes a battery1, an auxiliary device2and a photographic device3, the battery1is a large-capacity battery1arranged outside the auxiliary device2, the battery1provides a voltage of 6.2V to 16.8V, and the battery1is configured to supply power to the auxiliary device2and the photographic device3.

Referring toFIG.2, the auxiliary device2includes an internal power supply apparatus and an internal load204, and the internal power supply apparatus is configured to receive electricity provided by the battery1, transfer the electricity to the internal load204, and output the electricity to the photographic device3, so as to achieve the purpose that the single battery1simultaneously supplies power to the auxiliary device2and the photographic device3. The internal loads204refer to other functional modules inside the auxiliary device2than the internal power supply apparatus, and these functional modules are original modules inside the auxiliary device2.

Specifically, the internal power supply apparatus includes a battery interface201, a USB-PD power interface208, a forward power supply circuit, a reverse power supply circuit, a power bus209, a control bus210, and a power supply control circuit. A first input end of the forward power supply circuit is connected with the battery1through the battery interface201, an input end of the power bus209is connected with an output end of the forward power supply circuit, an output end of the power bus209is connected with an input end of the reverse power supply circuit, an input end of the power supply control circuit, and the internal load204, an output end of the reverse power supply circuit is connected with the photographic device3through the USB-PD power interface208, and the electricity on the battery1sequentially passes through the battery interface201, the forward power supply circuit and the power bus209and then enters the internal load204; that is, the internal load204is powered on. In addition, the power supply control circuit controls a voltage value output by the reverse power supply circuit through the control bus210, such that after the power bus209transfers the electricity provided by the battery1into the reverse power supply circuit, the voltage value supplied by the reverse power supply circuit to the photographic device3is controlled by the power supply control circuit, so as to guarantee safe and stable operation of the photographic device3.

Further, the forward power supply circuit includes a protection circuit202and a selector203, the protection circuit202is arranged close to the first input end, and the protection circuit202plays a role in preventing reverse connection and an overvoltage of the battery1, thereby protecting the auxiliary device2from being damaged when the battery1is connected wrongly or the voltage of the battery1is over high. The selector203is provided close to the output end of the forward power supply circuit, and the selector203is a power selector for determining whether to connect the battery1and the power bus209. InFIG.2, an input end of the selector203connected with the protection circuit202is denoted by A.

Referring toFIG.3, in a specific example, the protection circuit202includes a NMOS transistor K1, a capacitor C1, and a diode T1connected in parallel. The NMOS transistor K1is provided towards a side where the battery1is arranged, a gate and a source of the NMOS transistor K1are interfaced with the battery1, and a drain of the NMOS transistor K1is connected with the input end A of the selector203. The capacitor C1and the diode T1are provided close to a side where the internal load204is arranged. In other examples, the protection circuit202may also be a transient voltage suppressor (TVS). In practical use, a specific structure of the protection circuit202is not limited herein, as long as the protection effect of preventing the reverse connection and the overvoltage of the battery1can be achieved.

Referring toFIG.2, the reverse power supply circuit includes a boost-buck chip205, a digital-to-analog converter206and a first switch transistor207, an input end of the boost-buck chip205is connected with the output end of the power bus209, an output end of the boost-buck chip205is connected with an input end of the first switch transistor207, and an output end of the first switch transistor207is connected with the USB-PD power interface208. An input end of the digital-to-analog converter206is connected to the input end and the output end of the boost-buck chip205, and configured to collect a voltage value entering the boost-buck chip205and a voltage value output by the boost-buck chip205. The power supply control circuit is connected with the selector203, the boost-buck chip205, the digital-to-analog converter206and the first switch transistor207through the control bus210, and the connection is indicated by a solid line with an arrow inFIG.2. Specifically, the power supply control circuit can dynamically adjust a parameter value of the boost-buck chip205according to the voltage value collected by the digital-to-analog converter206, and thus adjust the voltage value output by the boost-buck chip205, so as to meet a power demand of the photographic device3. InFIG.2, the boost-buck chip205is denoted by Boost_buck, and the digital-to-analog converter206is denoted by DAC.

Referring toFIG.4, the above first switch transistor207is composed of two PMOS transistors connected in series, the two PMOS transistors are a first MOS transistor Q1and a second MOS transistor Q2, a drain of the first MOS transistor Q1is connected with the power bus209, a source of the first MOS transistor Q1is connected with a source of the second MOS transistor Q2in series, a drain of the second MOS transistor Q2is connected with the USB-PD power interface208, and a gate of the first MOS transistor Q1and a gate of the second MOS transistor Q2are both connected to the control bus210and uniformly controlled by the power supply control circuit. In addition, parasitic diodes are arranged on the first MOS transistor Q1and the second MOS transistor Q2respectively, and configured to protect circuit safety of the first MOS transistor Q1and the second MOS transistor Q2.

It should be noted that the power bus209is an original circuit structure in the auxiliary device2, and the power bus209is a generic term of a structure which can convert the electricity supplied from the battery1into the electricity required by the internal load204. The control bus210is a cable provided between the power supply control circuit and modules controlled by the power supply control circuit, and is mainly configured to transmit control signals of the power supply control circuit. InFIG.2, the power bus209is denoted by a bold dashed line, and the control bus210is denoted by a bold solid line.

The power supply control circuit includes a LDO regulator chip211and a PD protocol chip212, the PD protocol chip212is connected with the power bus209through the LDO regulator chip211, and the PD protocol chip212is powered by the power bus209. In a specific example, a working voltage of the PD protocol chip212is 5V, and therefore, the LDO regulator chip converts the voltage obtained from the power bus209into a voltage of 5V, and then transmits the voltage to the PD protocol chip212. The PD protocol chip212is connected with the selector203, the boost-buck chip205, the digital-to-analog converter206, and the first switch transistor207through the control bus210, and configured to integrally control the battery1to supply power to the power bus209, and the reverse power supply circuit provides a required voltage for the photographic device3.

In conclusion, the internal power supply apparatus for an auxiliary device supporting a PD protocol according to the first embodiment of the present application has an implementation principle that when the USB-PD power interface208is connected with the photographic device3, the PD protocol chip212drives the selector203to connect the battery1and the power bus209, the power bus209obtains the electricity from the battery1, and then, the power bus209simultaneously supplies power to the internal load204, the reverse power supply circuit, and the power supply control circuit, the PD protocol chip212also switches on the first switch transistor207and controls the boost-buck chip205to output the working voltage required by the photographic device3, and at this point, the reverse power supply circuit supplies power to the photographic device3through the USB-PD power interface208, thereby achieving the purpose that one external large-capacity battery1simultaneously supplies power to the auxiliary device2and the photographic device3.

It should be noted that, in practical application, another electronic device supporting the PD protocol may be connected to the USB-PD power interface208, and therefore, the PD protocol chip212reads a working voltage of the electronic device and then controls the voltage value provided by the reverse power supply circuit for the electronic device, such that the internal power supply apparatus according to the present application has a wider application range.

Second Embodiment

Referring toFIG.5, the second embodiment is different from the first embodiment in that the forward power supply circuit further includes a second input end, the second input end of the forward power supply circuit is connected with the external power source4through the USB-PD power interface208, and the external power source4is, for example, a portable charger and an indoor power source; that is, the external power source4is a power source with power entering the auxiliary device2after subjected to voltage matching and voltage conversion.

Referring toFIG.6, a second switch transistor213is provided at an end of the forward power supply circuit close to the second input end, an input end of the second switch transistor213is connected with the USB-PD power interface208, an output end of the second switch transistor213is connected with the other input end of the selector203, and a port of the connection is denoted by B. The power supply control circuit is connected with the second switch transistor213through the control bus210.

It should be noted that the second switch transistor213is similar to the first switch transistor207, the second switch transistor213is also composed of two PMOS transistors connected in series, and a connection manner of the two PMOS transistors is the same as that of the two PMOS transistors in the first switch transistor207. For convenience of distinction, the two PMOS transistors in the second switch transistor213are referred to as a third MOS transistor Q3and a fourth MOS transistor Q4(not shown) respectively, a drain of the third MOS transistor Q3is connected with the USB-PD power interface208, a source of the third MOS transistor Q3is connected with a source of the fourth MOS transistor Q4in series, a drain of the fourth MOS transistor Q4is connected with the input end B of the selector203, a gate of the third MOS transistor Q3and a gate of the fourth MOS transistor Q4are both connected to the control bus210, and the PD protocol chip212controls the third MOS transistor Q3and the fourth MOS transistor Q4to be switched on or off. In addition, parasitic diodes are arranged on the third MOS transistor Q3and the fourth MOS transistor Q4respectively, and configured to protect circuit safety of the third MOS transistor Q3and the fourth MOS transistor Q4.

In conclusion, the internal power supply apparatus for an auxiliary device supporting a PD protocol according to the second embodiment of the present application has an implementation principle that when the USB-PD power interface208is connected with the external power source4, the PD protocol chip212drives the second switch transistor213to connect the external power source4and the power bus209, the power bus209obtains the electricity from the external power source4, the power bus209simultaneously supplies power to the internal load204and the power supply control circuit, the PD protocol chip212switches off the first switch transistor207and the boost-buck chip205, and at this point, the reverse power supply circuit stops outputting the voltage, thus achieving the purpose that the external power source4supplies power to the auxiliary device2through the USB-PD power interface208.

The foregoing description is only preferred embodiments of the present application and is illustrative of the principle of the employed technology. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the technical solution formed by a particular combination of technical features described above, but also encompasses other technical solutions formed by any combination of the technical features described above or equivalents thereof without departing from the concept of the disclosure, for example, technical solutions formed by mutually replacing the above features and the technical features (but not limited to) having similar functions disclosed in the present application.