Power supply control circuit and electric equipment

Abstract

A power supply control circuit and electric equipment belong to the technical field of power supplies, are connected with a main power supply and a standby power supply, and convert a main power supply voltage into a power supply voltage through a DC conversion circuit; the communication circuit is powered on according to the power supply voltage, receives a forbidding instruction and outputs a turn-off signal in response to the forbidding instruction; the output circuit cuts off the output of the standby power supply voltage according to the turn-off signal; wherein the main power supply is used for outputting main power supply voltage, and the standby power supply is used for outputting standby power supply voltage; therefore, the standby power supply is disabled in a communication mode, the standby power supply does not need to be directly cut off manually, and the possibility that the standby power supply is damaged in the maintenance process is reduced.

Description

Technical Field

[0001] This application belongs to the field of power supply technology, and in particular relates to a power control circuit and an electrical device. Background Technology

[0002] In vehicle factory production lines and after-sales vehicle repair scenarios, there are situations where the vehicle's small battery power is disconnected. If the backup battery also starts working automatically at this time, the battery will be over-discharged and damaged. The conventional way to avoid this is to remove the backup power supply before disconnecting the main power supply. However, if the backup power supply is located inside the components, the time cost of the removal operation is relatively high.

[0003] Therefore, there is an urgent need to provide a power control circuit to disable the backup power supply from outputting externally, thereby reducing the possibility of accidental damage to the backup power supply during the engineering phase. Utility Model Content

[0004] The purpose of this application is to provide a power control circuit and electrical equipment, which aims to solve the problems of the inability of related electrical equipment to disable the external output of backup power and the accidental damage of backup power during the engineering phase.

[0005] This application provides a power control circuit connected to a main power supply and a backup power supply. The power control circuit includes a DC-DC conversion circuit, a communication circuit, and an output circuit.

[0006] The DC-DC conversion circuit is connected to the main power supply and is used to convert the main power supply voltage into the supply voltage.

[0007] The communication circuit is connected to the DC-DC conversion circuit and is used to power on according to the power supply voltage, receive a disable command, and output a shutdown signal in response to the disable command.

[0008] The output circuit is connected to the communication circuit and the backup power supply, and is used to disconnect the output of the backup power supply voltage according to the shutdown signal.

[0009] The main power supply is used to output the main power supply voltage, and the backup power supply is used to output the backup power supply voltage.

[0010] In one embodiment, when the main power supply voltage is disconnected, the DC-DC conversion circuit is further configured to output a first level signal and stop outputting the power supply voltage;

[0011] The output circuit is also connected to the DC-DC conversion circuit and is also used to maintain the disconnection of the backup power supply voltage based on the first level signal.

[0012] In one embodiment, a comparator circuit and a switching circuit are also included;

[0013] The communication circuit is also used to power on according to the power supply voltage, receive power supply commands, and output a power off signal in response to the power supply commands;

[0014] The DC-DC conversion circuit is also used to convert the main power supply voltage into a supply voltage and output a second level signal;

[0015] The output circuit is also configured to transmit the backup power supply voltage in response to the second level signal when the shutdown signal is disconnected.

[0016] The comparison circuit is connected to the main power supply and the output circuit, and is used to divide the main power supply voltage, and output a third level signal in response to the main power supply voltage being greater than the backup power supply voltage.

[0017] The switching circuit is connected to the comparator circuit, the output circuit, the DC-DC conversion circuit, and the backup power supply, and is used to disconnect the output of the backup power supply voltage based on the third level signal.

[0018] In one embodiment, a comparator circuit and a switching circuit are also included;

[0019] The DC-DC conversion circuit is also used to disconnect and stop the output of the power supply voltage based on the main power supply voltage, and to maintain the output of the second level signal for a preset time.

[0020] The comparison circuit is connected to the output circuit and is used to output a fourth level signal according to the backup power supply voltage in response to the disconnection of the main power supply voltage.

[0021] The switching circuit is connected to the comparator circuit, the output circuit, the DC-DC converter circuit, and the backup power supply, and is used to transmit the backup power supply voltage based on the fourth level signal;

[0022] The DC-DC conversion circuit is also used to convert the backup power supply voltage into the supply voltage and output the second level signal;

[0023] The output circuit is also used to maintain the output of the backup power supply voltage based on the second level signal.

[0024] In one embodiment, it further includes:

[0025] A boost circuit, connected to the switching circuit and the DC-DC conversion circuit, is used to boost the voltage of the backup power supply.

[0026] The DC-DC conversion circuit is specifically used to convert the boosted backup power supply voltage into a supply voltage and output the second level signal.

[0027] In one embodiment, an energy storage circuit is also included;

[0028] The energy storage circuit is connected to the DC-DC conversion circuit and the communication circuit, and is used to store energy according to the power supply voltage and output the energy storage voltage.

[0029] The communication circuit is also configured to power on according to the energy storage voltage, receive protection commands, and output the shutdown signal in response to the protection commands;

[0030] The output circuit is also used to disconnect the output of the backup power supply voltage according to the shutdown signal;

[0031] The comparison circuit is also configured to output a third-level signal in response to the disconnection of the backup power supply voltage and the main power supply voltage;

[0032] The switching circuit is also used to disconnect the output of the backup power supply voltage according to the third level signal;

[0033] The DC-DC conversion circuit is also used to stop outputting the power supply voltage according to the disconnection of the backup power supply voltage and the main power supply voltage, and to output the first level signal;

[0034] The output circuit is also used to maintain the disconnection of the backup power supply voltage according to the first level signal.

[0035] In one embodiment, the communication circuit includes a communication module and a first field-effect transistor;

[0036] The communication module is used to power on according to the power supply voltage, receive a disable command, and output a shutdown control signal in response to the disable command;

[0037] The gate of the first field-effect transistor is connected to the communication module to receive the shutdown control signal; the shutdown control signal is used to control the first field-effect transistor to turn off.

[0038] The drain of the first field-effect transistor forms the output terminal of the communication circuit, which is connected to the output circuit and the backup power supply to output the shutdown signal;

[0039] The source of the first field-effect transistor is connected to the power supply ground.

[0040] In one embodiment, the output circuit includes a second field-effect transistor, a third field-effect transistor, and a first resistor;

[0041] The first end of the first resistor is connected to the source of the third field-effect transistor and forms the input terminal of the output circuit, which is connected to the backup power supply to receive the backup power supply voltage.

[0042] The drain of the third field-effect transistor forms the output terminal of the output circuit, which is connected to the comparator circuit and the switching circuit to output the backup power supply voltage.

[0043] The gate of the second field-effect transistor constitutes the control terminal of the output circuit, and is connected to the DC-DC conversion circuit and the communication circuit to receive the first level signal, the second level signal and the turn-off signal;

[0044] The second end of the first resistor is connected to the gate of the third field-effect transistor and the drain of the second field-effect transistor, and the source of the second field-effect transistor is connected to the power supply ground.

[0045] In one embodiment, the comparison circuit includes a comparator, a second resistor, and a third resistor;

[0046] The first end of the second resistor constitutes the first input terminal of the comparator circuit, and is connected to the main power supply and the DC-DC conversion circuit to receive the main power supply voltage;

[0047] The non-inverting input terminal of the comparator forms the second input terminal of the comparator circuit, and is connected to the switching circuit and the output circuit to access the backup power supply voltage;

[0048] The output terminal of the comparator constitutes the output terminal of the comparator circuit, and is connected to the switching circuit to output the third level signal and the fourth level signal;

[0049] The second end of the second resistor is connected to the first end of the third resistor and the inverting input of the comparator, and the second end of the third resistor is connected to the power supply ground.

[0050] This utility model embodiment also provides an electrical device, which includes the power control circuit described above.

[0051] In one embodiment, the electrical device is an electric vehicle.

[0052] The beneficial effects of this utility model embodiment compared with the prior art are as follows: Since the communication circuit is powered on according to the power supply voltage, receives the disable command, and outputs a shutdown signal in response to the disable command, the output circuit disconnects the output of the backup power supply voltage according to the shutdown signal; therefore, the backup power supply is disabled through communication, without the need to manually cut off the backup power supply directly, reducing the possibility of damage to the backup power supply during maintenance. Attached Figure Description

[0053] To more clearly illustrate the technical utility model in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 A schematic diagram of a power control circuit provided in an embodiment of this application;

[0055] Figure 2 A schematic diagram of another structure of the power control circuit provided in one embodiment of this application;

[0056] Figure 3 A schematic diagram of another structure of the power control circuit provided in one embodiment of this application;

[0057] Figure 4 A schematic diagram of another structure of the power control circuit provided in one embodiment of this application;

[0058] Figure 5 A schematic diagram of another structure of the power control circuit provided in one embodiment of this application;

[0059] Figure 6 A schematic diagram of another structure of the power control circuit provided in one embodiment of this application;

[0060] Figure 7 Another example circuit schematic of a power control circuit provided in an embodiment of this application. Detailed Implementation

[0061] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0062] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0063] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0065] Figure 1 A schematic diagram of the power control circuit provided in a preferred embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below:

[0066] The power control circuit described above is connected to the main power supply 80 and the backup power supply 90. The power control circuit includes a DC-DC conversion circuit 01, a communication circuit 02 and an output circuit 03.

[0067] DC-DC converter circuit 01 is connected to main power supply 80 and is used to convert the main power supply voltage into the supply voltage.

[0068] The communication circuit 02 is connected to the DC-DC conversion circuit 01 and is used to power on according to the supply voltage, receive a disable command, and output a shutdown signal in response to the disable command.

[0069] Output circuit 03, connected to communication circuit 02 and backup power supply 90, is used to disconnect the output of backup power supply voltage according to the shutdown signal;

[0070] The main power supply is used to output the main power supply voltage, and the backup power supply is used to output the backup power supply voltage.

[0071] It should be noted that the communication circuit 02 is also connected to the host computer, which is used to output disable commands.

[0072] like Figure 2 As shown, when the main power supply voltage is disconnected, the DC-DC converter circuit 01 is also used to output a first level signal and stop outputting the power supply voltage.

[0073] The output circuit 03 is also connected to the DC-DC conversion circuit 01 and is also used to maintain the disconnection of the backup power supply voltage based on the first level signal.

[0074] It should be noted that the first level signal can be a low level signal.

[0075] The above technical solution maintains the disconnection of the backup power supply voltage when the mains power supply voltage is disconnected, further improving the reliability of the power control circuit.

[0076] like Figure 3 As shown, the power control circuit also includes a comparator circuit 04 and a switch circuit 05.

[0077] The communication circuit 02 is also used to receive a power supply command based on the power supply voltage mentioned above, and to output a power supply disconnection signal in response to the power supply command.

[0078] The DC-DC converter circuit 01 is also used to convert the main power supply voltage into the supply voltage and output a second level signal.

[0079] Output circuit 03 is also used to output a backup power supply voltage in response to a second level signal when the shutdown signal is disconnected.

[0080] Comparator circuit 04 is connected to main power supply 80 and output circuit 03. It is used to divide the main power supply voltage and output a third level signal in response to the main power supply voltage being greater than the backup power supply voltage.

[0081] The switching circuit 05, connected to the comparator circuit 04, the output circuit 03, the DC-DC conversion circuit 01, and the backup power supply 90, is used to disconnect the output of the backup power supply voltage based on the third level signal.

[0082] It can be understood that the first level signal can be a high level signal, and the third level signal can be a low level signal.

[0083] The above technical solution enables the main power supply 80 to be activated and the backup power supply 90 to be disconnected via communication, improving the convenience and reliability of use.

[0084] like Figure 4 As shown, the power control circuit also includes a comparator circuit 04 and a switch circuit 05.

[0085] The DC-DC conversion circuit 01 is also used to disconnect and stop the output of the power supply voltage based on the main power supply voltage, and to maintain the output of the second level signal for a preset time.

[0086] Comparator circuit 04, connected to output circuit 03, is used to output a fourth level signal based on the backup power supply voltage in response to the disconnection of the main power supply voltage.

[0087] The switching circuit 05, connected to the comparator circuit 04, the output circuit 03, the DC-DC conversion circuit 01, and the backup power supply 90, is used to transmit the backup power supply voltage based on the fourth level signal.

[0088] The DC-DC converter circuit 01 is also used to convert the backup power supply voltage into the supply voltage and output a second level signal.

[0089] Output circuit 03 is also used to maintain the output of backup power supply voltage based on the second level signal.

[0090] It can be understood that the fourth level signal can be a high level signal.

[0091] The above technical solution enables the backup power supply 90 to be activated and the main power supply 80 to be disconnected via communication, improving the convenience and reliability of use.

[0092] like Figure 4 As shown, the power control circuit described above also includes a boost circuit 06.

[0093] The boost circuit 06 is connected to the switching circuit 05 and the DC-DC conversion circuit 01, and is used to boost the backup power supply voltage.

[0094] DC-DC converter circuit 01 is specifically used to convert the boosted backup power supply voltage into the supply voltage and output a second level signal.

[0095] By using the above technical solution, the backup power supply voltage is boosted, achieving voltage matching between the backup power supply 90 and the DC-DC conversion circuit 01, improving the reliability of the power control circuit, and increasing the conversion efficiency.

[0096] like Figure 6 As shown, the power control circuit also includes an energy storage circuit 07.

[0097] The energy storage circuit 07 is connected to the DC-DC conversion circuit 01 and the communication circuit 02. It is used to store energy according to the supply voltage and output the stored energy voltage.

[0098] The communication circuit 02 is also used to power on according to the energy storage voltage, receive protection commands, and output a shutdown signal in response to the protection commands.

[0099] Output circuit 03 is also used to disconnect the output of the backup power supply voltage according to the shutdown signal.

[0100] Comparator circuit 04 is also used to output a third-level signal in response to the disconnection of the backup power supply voltage and the main power supply voltage.

[0101] Switching circuit 05 is also used to disconnect the output of the backup power supply voltage according to the third level signal.

[0102] The DC-DC conversion circuit 01 is also used to stop outputting the power supply voltage according to the disconnection of the backup power supply voltage and the main power supply voltage, and to output a first level signal.

[0103] Output circuit 03 is also used to maintain the disconnection of the backup power supply voltage according to the first level signal.

[0104] Through the above technical solution, in the scenario where the main power supply 80 is disconnected and the backup power supply is activated, after the maintenance personnel complete the rescue, the power of the backup power supply 90 is protected, reducing the possibility of ground damage caused by over-discharge of the backup power supply 90.

[0105] Figure 7 The diagram illustrates another partial example circuit structure of the power control circuit provided in an embodiment of the present invention. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown, and are described in detail below:

[0106] Communication circuit 02 includes a communication module and a first field-effect transistor M1;

[0107] The communication module powers on according to the supply voltage, receives a disable command, and outputs a shutdown control signal in response to the disable command. The gate of the first field-effect transistor M1 is connected to the communication module to receive the shutdown control signal. The shutdown control signal is used to control the first field-effect transistor M1 to turn off. The drain of the first field-effect transistor M1 forms the output terminal of the communication circuit 02, which is connected to the output circuit 03 and the backup power supply 90 to output a shutdown signal. The source of the first field-effect transistor M1 is connected to the power supply ground.

[0108] It is understood that the communication circuit 02 also includes a second capacitor C2 and a fifth resistor R5; the first end of the fifth resistor R5 and the first end of the second capacitor C2 are connected to the gate of the first field-effect transistor M1, and the second end of the fifth resistor R5 and the second end of the second capacitor C2 are connected to the power supply ground.

[0109] The first field-effect transistor M1 can be an N-type field-effect transistor; the communication module can be a wireless communication module or a wired communication module.

[0110] It should be noted that the communication module receives communication signals, which may carry a disable instruction. The communication module extracts the disable instruction based on the communication signal and outputs a high-level shutdown control signal in response to the disable instruction. The first field-effect transistor M1 is turned off according to the high-level shutdown control signal, so that a low-level shutdown signal is output at the drain of the first field-effect transistor M1.

[0111] The output circuit 03 includes a second field-effect transistor M2, a third field-effect transistor M3, and a first resistor R1.

[0112] The first terminal of the first resistor R1 is connected to the source of the third field-effect transistor M3 and forms the input terminal of the output circuit 03, which is connected to the backup power supply 90 to receive the backup power supply voltage; the drain of the third field-effect transistor M3 forms the output terminal of the output circuit 03, which is connected to the comparator power supply and the switching circuit 05 to output the backup power supply voltage; the gate of the second field-effect transistor M2 forms the control terminal of the output circuit 03, which is connected to the DC-DC conversion circuit 01 and the communication circuit 02 to receive the first level signal, the second level signal, and the turn-off signal; the second terminal of the first resistor R1 is connected to the gate of the third field-effect transistor M3 and the drain of the second field-effect transistor M2, and the source of the second field-effect transistor M2 is connected to the power supply ground.

[0113] The second field-effect transistor M2 can be an N-type field-effect transistor, and the third field-effect transistor M3 can be a P-type field-effect transistor; this output circuit 03 is simple and reliable.

[0114] The comparator circuit 04 includes a comparator U1, a second resistor R2, and a third resistor R3.

[0115] The first end of the second resistor R2 forms the first input terminal of the comparator circuit 04, which is connected to the main power supply 80 and the DC-DC conversion circuit 01 to receive the main power supply voltage; the non-inverting input terminal of the comparator U1 forms the second input terminal of the comparator circuit 04, which is connected to the switching circuit 05 and the output circuit 03 to receive the backup power supply voltage; the output terminal of the comparator U1 forms the output terminal of the comparator circuit 04, which is connected to the switching circuit 05 to output the third level signal and the fourth level signal; the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the inverting input terminal of the comparator U1, and the second end of the third resistor R3 is connected to the power supply ground.

[0116] The main power supply voltage is divided by the second resistor R2 and the third resistor R3. The comparator U1 compares the divided main power supply voltage with the backup power supply voltage. The circuit is simple and reliable.

[0117] The switching circuit 05 includes the fourth field-effect transistor M4.

[0118] The gate of the fourth field-effect transistor M4 forms the control terminal of the switching circuit 05 and is connected to the comparator circuit 04 to receive the third level signal and the fourth level signal; the source of the fourth field-effect transistor M4 forms the input terminal of the switching circuit 05 and is connected to the output circuit 03 and the comparator circuit 04 to receive the backup power supply voltage; the drain of the fourth field-effect transistor M4 forms the output terminal of the switching circuit 05 and is connected to the DC-DC conversion circuit 01 and the main power supply 80 to output the backup power supply voltage.

[0119] It is understood that the switching circuit 05 also includes a first capacitor C1 and a fourth resistor R4; the first end of the fourth resistor R4 and the first end of the first capacitor C1 are connected to the gate of the fourth field-effect transistor M4, and the second end of the fourth resistor R4 and the second end of the first capacitor C1 are connected to the power supply ground.

[0120] It includes an inductor L1 and a third capacitor C3; the first end of the inductor L1 and the first end of the third capacitor C3 are connected and together form the power supply voltage input terminal of the energy storage circuit 07, which is connected to the DC-DC conversion circuit 01 to receive the power supply voltage; the second end of the inductor L1 forms the energy storage voltage output terminal of the energy storage circuit 07, which is connected to the communication circuit 02 to output the energy storage voltage; the second end of the third capacitor C3 is connected to the power supply ground.

[0121] The energy storage circuit 07 uses both inductors and capacitors for energy storage, thereby increasing the capacity of energy storage.

[0122] It should be noted that the power control circuit described above may also include a first diode D1 and a sixth resistor R6; the cathode of the first diode D1 and the first terminal of the sixth resistor R6 are connected to the DC-DC conversion circuit 01; the anode of the first diode D1 and the second terminal of the sixth resistor R6 are connected to the communication circuit 02 and the output circuit 03.

[0123] Current limiting of the status signal is achieved by using the first diode D1 and the sixth resistor R6, which improves the reliability of the power control circuit.

[0124] The power control circuit described above may also include a second diode D2; the positive terminal of the second diode D2 is connected to the main power supply 80, and the negative terminal of the second diode D2 is connected to the boost circuit 06 and the DC-DC conversion circuit 01.

[0125] By using the second diode D2, the possibility of the boosted backup power supply voltage flowing back to the main power supply 80 is reduced, thus improving the reliability of the power control circuit.

[0126] The power control circuit described above may also include a third diode D3. The positive terminal of the third diode D3 is connected to the boost circuit 06, and the negative terminal of the third diode D3 is connected to the main power supply 80 and the DC-DC conversion circuit 01.

[0127] By using the third diode D3, the possibility of the main power supply voltage flowing back to the backup power supply 90 is reduced, thus improving the reliability of the power control circuit.

[0128] The power control circuit described above may also include a seventh resistor R7; wherein, the seventh resistor R7 is connected between the status signal output terminal of the DC-DC conversion circuit 01 and the power supply voltage output terminal of the DC-DC conversion circuit 01; the seventh resistor R7 is used to pull up the second level signal.

[0129] The following is based on the working principle.Figure 7 Further explanation is provided below:

[0130] Figure 7 The power control circuit shown operates in four ways:

[0131] In the first case, the DC-DC converter circuit 01 converts the main power supply voltage into the supply voltage; the communication module powers on according to the supply voltage, receives a disable command, and outputs a high-level shutdown control signal to the gate of the first field-effect transistor M1 in response to the disable command. The drain of the first field-effect transistor M1 outputs a low-level shutdown signal to the second field-effect transistor M2. The second field-effect transistor M2 and the third field-effect transistor M3 are turned off, thereby the output circuit 03 disconnects the output of the backup power supply voltage.

[0132] If the maintenance personnel disconnect the main power supply 80 and the DC-DC conversion circuit 01, the DC-DC conversion circuit 01 will output a first-level signal (low level) to the gate of the second field-effect transistor M2 when the main power supply voltage is disconnected, and stop outputting the supply voltage to the communication circuit 02. Therefore, the second field-effect transistor M2 is cut off based on the first-level signal, the third field-effect transistor M3 is cut off, and the output circuit 03 maintains the disconnection of the backup power supply voltage, thus achieving the disabling of the backup power supply 90.

[0133] In the second scenario, the communication module powers on based on the supply voltage, receives a power supply command, and responds by disconnecting the output of a high-level shutdown control signal. The first field-effect transistor M1 is turned off, ceasing to output a low-level shutdown signal. The DC-DC converter 01 converts the main power supply voltage to the supply voltage and outputs a second-level signal (high level) to the gate of the second field-effect transistor M2. The second and third field-effect transistors M2 and M3 are then turned on, allowing the output circuit 03 to output the backup power supply voltage. Since the non-inverting input of comparator U1 stops receiving the backup power supply voltage, and the inverting input of comparator U1 receives the divided main power supply voltage, the output of comparator U1 outputs a third-level signal (low level). The fourth field-effect transistor M4 disconnects the backup power supply voltage output based on the third-level signal. This enables the main power supply 80 and disconnects the backup power supply 90.

[0134] In the third case, when the main power supply 80 is disconnected, the DC-DC converter 01 stops outputting the supply voltage based on the disconnection of the main power supply voltage, and maintains the output of the second level signal (high level) for a preset time; the comparator U1 responds to the disconnection of the main power supply voltage and outputs the fourth level signal (high level); the fourth field-effect transistor M4 transmits the backup power supply voltage based on the fourth level signal; the DC-DC converter 01 converts the backup power supply voltage into the supply voltage and outputs the second level signal (high level); thus, the second field-effect transistor M2 and the third field-effect transistor M3 are turned on, and the output circuit 03 maintains the output of the backup power supply voltage; thus, the backup power supply 90 is enabled when the main power supply 80 is disconnected.

[0135] In the fourth scenario, where the main power supply 80 is disconnected and the backup power supply is activated, the first inductor L1 and the third capacitor C3 store energy according to the supply voltage and output the stored energy voltage; the communication module powers on according to the stored energy voltage, receives the protection command, and outputs a high-level shutdown control signal in response to the protection command; the first field-effect transistor M1 outputs a low-level shutdown signal from its drain according to the high-level shutdown control signal; the second field-effect transistor M2 and the third field-effect transistor M3 are turned off, thereby disconnecting the backup power supply voltage output from the output circuit 03; Comparator U1 responds to the disconnection of the backup power supply voltage and the main power supply voltage by outputting a third-level signal (low level); the fourth field-effect transistor M4 disconnects the output of the backup power supply voltage according to the third-level signal; thus, the DC-DC converter module stops outputting the supply voltage according to the disconnection of the backup power supply voltage and the main power supply voltage, and outputs a first-level signal (low level); the second field-effect transistor M2 and the third field-effect transistor M3 remain off, and the output circuit 03 maintains the disconnection of the backup power supply voltage; thus, in the scenario where the main power supply 80 is disconnected and the backup power supply is activated, the power protection of the backup power supply 90 is achieved after the maintenance personnel have completed the rescue.

[0136] This utility model embodiment also provides an electrical device, which includes the power control circuit described above.

[0137] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0138] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A power control circuit, characterized by comprising: The power supply control circuit is connected with a main power supply and a backup power supply, and comprises a direct current conversion circuit, a communication circuit and an output circuit; The direct current conversion circuit is connected with the main power supply and is configured to convert the main power supply voltage into a supply voltage; The communication circuit is connected with the direct current conversion circuit and is configured to be powered on according to the supply voltage, receive a disable instruction, and output an off signal in response to the disable instruction; The output circuit is connected with the communication circuit and the backup power supply and is configured to disconnect the output of the backup power supply voltage according to the off signal; The main power supply is configured to output the main power supply voltage, and the backup power supply is configured to output the backup power supply voltage.

2. The power control circuit of claim 1, wherein, In the case of disconnection of the main power supply voltage, the direct current conversion circuit is further configured to output a first level signal and stop outputting the supply voltage; The output circuit is further connected with the direct current conversion circuit and is further configured to maintain the disconnection of the backup power supply voltage based on the first level signal.

3. The power control circuit of claim 2, wherein, Further comprising a comparison circuit and a switch circuit; The communication circuit is further configured to be powered on according to the supply voltage, receive a power supply instruction, and disconnect the output of the off signal in response to the power supply instruction; The direct current conversion circuit is further configured to convert the main power supply voltage into a supply voltage and output a second level signal; The output circuit is further configured to transmit the backup power supply voltage in response to the second level signal in the case of disconnection of the off signal; The comparison circuit is connected with the main power supply and the output circuit and is configured to divide the main power supply voltage and output a third level signal in response to the divided main power supply voltage being greater than the backup power supply voltage; The switch circuit is connected with the comparison circuit, the output circuit, the direct current conversion circuit and the backup power supply and is configured to disconnect the output of the backup power supply voltage based on the third level signal.

4. The power control circuit of claim 3, wherein, Further comprising a comparison circuit and a switch circuit; The direct current conversion circuit is further configured to stop the output of the supply voltage based on the disconnection of the main power supply voltage and maintain the output of the second level signal within a preset time length; The comparison circuit is connected with the output circuit and is configured to output a fourth level signal according to the backup power supply voltage in response to the disconnection of the main power supply voltage; The switch circuit is connected with the comparison circuit, the output circuit, the direct current conversion circuit and the backup power supply and is configured to transmit the backup power supply voltage based on the fourth level signal; The direct current conversion circuit is further configured to convert the backup power supply voltage into a supply voltage and output the second level signal; The output circuit is further configured to maintain the output of the backup power supply voltage based on the second level signal.

5. The power control circuit of claim 4, wherein, Further comprising: A boost circuit connected with the switch circuit and the direct current conversion circuit and configured to boost the backup power supply voltage; The direct current conversion circuit is specifically configured to convert the boosted backup power supply voltage into a supply voltage and output the second level signal.

6. The power control circuit of claim 4, wherein, Further comprising an energy storage circuit; The energy storage circuit is connected with the direct current conversion circuit and the communication circuit and is configured to store energy according to the supply voltage and output a storage voltage; The communication circuit is further configured to receive a protection instruction according to the energization of the storage voltage, and output the off signal in response to the protection instruction; The output circuit is further configured to disconnect the output of the backup power voltage according to the off signal; The comparison circuit is further configured to output a third level signal in response to the disconnection of the backup power voltage and the main power voltage; The switch circuit is further configured to disconnect the output of the backup power voltage according to the third level signal; The DC conversion circuit is further configured to stop outputting the supply voltage and output the first level signal according to the disconnection of the backup power voltage and the main power voltage; The output circuit is further configured to maintain the disconnection of the backup power voltage according to the first level signal.

7. The power control circuit of any one of claims 1 to 6, wherein, The communication circuit comprises a communication module and a first field effect transistor; The communication module is configured to receive a disable instruction according to the energization of the supply voltage, and output an off control signal in response to the disable instruction; The off control signal is configured to control the first field effect transistor to be off; A gate of the first field effect transistor is connected to the communication module to access the off control signal; A drain of the first field effect transistor constitutes an output end of the communication circuit, and is connected to the output circuit and the backup power supply to output the off signal; A source of the first field effect transistor is connected to a power ground.

8. The power control circuit of claim 2, wherein, The output circuit comprises a second field effect transistor, a third field effect transistor and a first resistor; A first end of the first resistor and a source of the third field effect transistor are connected and constitute an input end of the output circuit, and are connected to the backup power supply to access the backup power voltage; A drain of the third field effect transistor constitutes an output end of the output circuit, and is connected to a comparison circuit and a switch circuit to output the backup power voltage; A gate of the second field effect transistor constitutes a control end of the output circuit, and is connected to the DC conversion circuit and the communication circuit to access the first level signal, a second level signal and the off signal; A second end of the first resistor is connected to a gate of the third field effect transistor and a drain of the second field effect transistor, and a source of the second field effect transistor is connected to a power ground.

9. The power control circuit of claim 4, wherein, The comparison circuit comprises a comparator, a second resistor and a third resistor; A first end of the second resistor constitutes a first input end of the comparison circuit, and is connected to the main power supply and the DC conversion circuit to access the main power voltage; A positive input end of the comparator constitutes a second input end of the comparison circuit, and is connected to the switch circuit and the output circuit to access the backup power voltage; An output end of the comparator constitutes an output end of the comparison circuit, and is connected to the switch circuit to output the third level signal and a fourth level signal; A second end of the second resistor is connected to a first end of the third resistor and a negative input end of the comparator, and a second end of the third resistor is connected to a power ground.

10. An electric device, characterized by The power utilization device comprises the power supply control circuit according to any one of claims 1 to 9.

11. The powered device of claim 10, wherein, The power utilization device is an electric vehicle.

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