Power supply circuit and power supply device

Abstract

The utility model provides a power supply circuit and a power supply device. The power supply circuit comprises a power supply module, a first switch module and a second switch module. The input end of the power supply module is used for accessing a power supply bus. The output end of the power supply module is used for connecting a target circuit. The first end of the first switch module is connected with the output end of the power supply module. The first switch module is used for outputting a first control signal when the voltage of the output end of the power supply module is smaller than or equal to preset voltage. The first end of the second switch module is connected with the second end of the first switch module, the second end of the second switch module is connected with the controlled end of the power supply module, and the second switch module is used for outputting a circuit break signal to the controlled end of the power supply module when receiving the first control signal, so that the power supply module disconnects the access between the power supply bus and the target circuit. The power supply circuit can solve the problem that the bus voltage is lowered when the target circuit is short-circuited.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply circuit and a power supply device. Background Art

[0002] The auxiliary power supply is used to provide the operating voltage required by the target circuit at the initial start-up of other circuits, and stops supplying power after the output of other circuits is stable. In practical applications, the auxiliary power supply can convert the bus voltage of the power supply bus through the power supply circuit and transmit it to the target circuit, thereby providing the required voltage to the target circuit. However, if the target circuit connected to the power supply circuit is short-circuited, the voltage at the output end of the power supply circuit will be quickly lowered, thereby lowering the bus voltage and affecting the normal operation of other circuits connected to the power supply bus. Utility Model Content

[0003] The main purpose of the present application is to provide a power supply circuit and a power supply device, aiming to solve the problem of a short circuit in a target circuit causing a lower bus voltage.

[0004] In a first aspect, the present application provides a power supply circuit, comprising:

[0005] A power supply module, wherein the input end of the power supply module is used to connect to a power supply bus, and the output end of the power supply module is used to connect to a target circuit; the power supply module is used to supply power to the target circuit using a bus voltage provided by the power supply bus;

[0006] a first switch module, wherein a first end of the first switch module is connected to an output end of the power supply module, and the first switch module is configured to output a first control signal when a voltage at the output end of the power supply module is less than or equal to a preset voltage;

[0007] A second switch module, wherein the first end of the second switch module is connected to the second end of the first switch module, and the second end of the second switch module is connected to the controlled end of the power supply module, and the second switch module is used to output a circuit-breaking signal to the controlled end of the power supply module when receiving the first control signal, so that the power supply module disconnects the path between the power supply bus and the target circuit.

[0008] In one embodiment, the first switch module includes a first voltage stabilizing unit, a first switch unit and a filter unit;

[0009] The first end of the first voltage stabilizing unit serves as the first end of the first switch module, and the second end of the first voltage stabilizing unit is connected to the controlled end of the first switch unit;

[0010] The first end of the first switch unit is used for grounding, the second end of the first switch unit serves as the second end of the first switch module, and the second end of the first switch unit is also used for connecting to a first voltage source;

[0011] The filter unit is connected between the controlled end and the first end of the first switch unit.

[0012] In one embodiment, the first voltage stabilizing unit includes a first diode and a second diode; the cathode of the first diode serves as the first end of the first voltage stabilizing unit, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode serves as the second end of the first voltage stabilizing unit.

[0013] In one embodiment, the first switch unit includes a first resistor, a first switch tube and a second resistor;

[0014] The gate of the first switch tube serves as the controlled end of the first switch unit, the source of the first switch tube serves as the first end of the first switch unit, and the drain of the first switch tube serves as the second end of the first switch unit;

[0015] The first resistor is connected between the gate of the first switch tube and the second end of the first voltage stabilizing unit; the second resistor is connected between the drain of the first switch tube and the first voltage source.

[0016] In one embodiment, the second switch module includes a second switch unit, and the second switch unit includes a third resistor, a second switch tube and a fourth resistor;

[0017] The gate of the second switch tube is connected to the second end of the first switch module through the third resistor, the source of the second switch tube is used for grounding, and the drain of the second switch tube is connected to the controlled end of the power supply module through the fourth resistor.

[0018] In one embodiment, the power supply circuit further includes a power restoration module, which is connected to the first switch module; the power restoration module is used to output a power restoration signal to the first switch module based on a received power restoration instruction;

[0019] The first switch module is also used to output a second control signal to the second switch module when receiving the power-reply signal; the second switch module is also used to output a path signal to the controlled end of the power supply module when receiving the second control signal, and the path signal is used to instruct the power supply module to open the circuit between the power supply bus and the target circuit.

[0020] In one embodiment, the power restoration module includes a signal trigger unit and a control unit, the signal trigger unit is connected to the control unit, and the control unit is connected to the first switch module;

[0021] The signal trigger unit is used to output a trigger signal to the control unit when a power-on operation to the target circuit is detected; the control unit is also used to output the power-on signal to the first switch module when receiving the trigger signal.

[0022] In one embodiment, the signal triggering unit includes a signal triggering subunit, a switch subunit and a voltage stabilizing subunit;

[0023] The signal trigger subunit is connected to the first end of the switch subunit, and the signal trigger subunit is used to output a first level signal to the switch subunit when detecting a power-on operation on the target circuit;

[0024] The second end of the switch subunit is used to connect to the second voltage source, and the third end of the switch subunit is connected to the voltage stabilizing subunit; the switch subunit is used to output a second level signal to the voltage stabilizing subunit when receiving the first level signal;

[0025] The voltage stabilizing subunit is connected to the control unit, and is used for stabilizing the second level signal to obtain a trigger signal, and outputting the trigger signal to the control unit.

[0026] In one embodiment, the first switch module is provided with a voltage sampling point, and the control unit is also connected to the voltage sampling point; the control unit is also used to determine the number of short circuits of the target circuit according to the voltage information of the voltage sampling point, and enter a locked state when the number of short circuits is greater than or equal to a set number; the control unit in the locked state does not output the power-on signal when receiving the trigger signal.

[0027] In a second aspect, an embodiment of the present application further provides a power supply device, comprising a power supply circuit as described in any one of the embodiments of the present application.

[0028] The power supply circuit provided in the embodiment of the present application includes a power supply module, a first switch module and a second switch module. Among them, the input end of the power supply module is used to access the power supply bus, the output end of the power supply module is used to connect the target circuit, and the power supply module is used to use the bus voltage provided by the power supply bus to power the target circuit. The first end of the first switch module is connected to the output end of the power supply module, and the first switch module is used to output a first control signal when the voltage at the output end of the power supply module is less than or equal to the preset voltage. The first end of the second switch module is connected to the second end of the first switch module, and the second end of the second switch module is connected to the controlled end of the power supply module. The second switch module is used to output a disconnection signal to the controlled end of the power supply module when receiving the first control signal, so that the power supply module disconnects the passage between the power supply bus and the target circuit. The power supply circuit of the present application adds a first switch module and a second switch module on the basis of the power supply module. When a short circuit occurs in the target circuit, the disconnection signal can be output to the power supply module through the first switch module and the second switch module, so that the power supply module can be controlled to disconnect the passage between the power supply bus and the target circuit in time, so as to avoid the bus voltage provided by the power supply bus from being quickly pulled down, and ensure the normal operation of other circuits connected to the power supply bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A circuit diagram of an implementation of a power supply circuit provided in an embodiment of the present application;

[0031] Figure 2 A circuit diagram of an implementation of a first switch module provided in an embodiment of the present application;

[0032] Figure 3 A circuit diagram of another implementation of the first switch module provided in an embodiment of the present application;

[0033] Figure 4 A circuit diagram of an implementation of a second switch module provided in an embodiment of the present application;

[0034] Figure 5 A circuit diagram of an implementation of a power supply module provided in an embodiment of the present application;

[0035] Figure 6 A circuit diagram of another implementation of the power supply module provided in an embodiment of the present application;

[0036] Figure 7 A circuit diagram of another implementation of a power supply circuit provided in an embodiment of the present application;

[0037] Figure 8 A circuit diagram of an implementation of a power recovery module provided in an embodiment of the present application;

[0038] Fig. 9 A circuit diagram of another implementation of the power recovery module provided in an embodiment of the present application;

[0039] Fig.10 A circuit diagram of another implementation of the power recovery module provided in an embodiment of the present application;

[0040] Fig.11 A circuit diagram of another implementation of a power supply circuit provided in an embodiment of the present application;

[0041] Fig.12 A schematic block diagram of a power supply device provided in an embodiment of the present application.

[0042] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects rather than to describe a specific order or sequence.

[0044] It should also be noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart includes one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchangeable with each other, and some of the steps can also be deleted.

[0045] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] See also Figure 1 , Figure 1 A circuit diagram of an implementation of a power supply circuit provided in an embodiment of the present application.

[0047] like Figure 1 As shown, the power supply circuit 100 includes a power supply module 110 , a first switch module 120 and a second switch module 130 .

[0048] Among them, the input end of the power supply module 110 is used to connect to the power supply bus 10, the output end of the power supply module 110 is used to connect the target circuit 20, and the power supply module 110 is used to use the bus voltage Vg provided by the power supply bus 10 to provide power to the target circuit 20. The power supply module 110 can be, for example, a power supply module 110 of a BMS (Battery Management System) board, and of course, it can also be a power supply module 110 of other circuits. The target circuit 20 can be, for example, a PD (Power Delivery) circuit, a Bluetooth circuit, etc., and the embodiments of the present application do not specifically limit this.

[0049] The first end of the first switch module 120 is connected to the output end of the power supply module 110, and the first switch module 120 is used to output a first control signal when the voltage at the output end of the power supply module 110 is less than or equal to a preset voltage. The preset voltage may be determined according to the short-circuit voltage of the power supply module 110, and the short-circuit voltage is, for example, the voltage at the output end of the power supply module 110 when a short circuit occurs in the target circuit 20. The preset voltage may be slightly greater than the short-circuit voltage of the power supply module 110, so as to ensure that the first switch module 120 can output the first control signal when a short circuit occurs in the target circuit 20.

[0050] It should be noted that the first switch module 120 can change the conduction state according to the voltage at the output end of the power supply module 110, thereby outputting signals of different levels. For example, when the voltage at the output end of the power supply module 110 is greater than the preset voltage, the first switch module 120 is turned on to output a low-level signal. When the voltage at the output end of the power supply module 110 is less than or equal to the preset voltage, the first switch module 120 is turned off to output a high-level first control signal.

[0051] The first end of the second switch module 130 is connected to the second end of the first switch module 120, and the second end of the second switch module 130 is connected to the controlled end of the power supply module 110. The second switch module 130 is used to output a disconnection signal to the controlled end of the power supply module 110 when receiving the first control signal, so that the power supply module 110 disconnects the path between the power supply bus 10 and the target circuit 20.

[0052] It should be noted that the disconnection signal is used to control the power supply module 110 to disconnect the path between the power supply bus 10 and the target circuit 20, thereby disconnecting the power supply provided to the target circuit 20. The conduction state of the second switch module 130 can change with the change of the conduction state of the first switch module 120. For example, when the first switch module 120 is turned on and outputs a low-level signal, the second switch module 130 can be turned off according to the received low-level signal, and at this time, the second switch module 130 outputs a high-level signal to the controlled end of the power supply module 110, so that the power supply module 110 maintains the path between the power supply bus 10 and the target circuit 20. When the first switch module 120 is turned off and outputs a high-level first control signal, the second switch module 130 can be turned off according to the high-level first control signal, thereby outputting a low-level disconnection signal to the controlled end of the power supply module 110.

[0053] It can be understood that when the voltage at the output end of the power supply module 110 is greater than the preset voltage, the first switch module 120 outputs a voltage signal, and the second switch module 130 outputs a holding signal to the controlled end of the power supply module 110 when receiving the voltage signal, thereby controlling the power supply module 110 to maintain the path between the power supply bus 10 and the target circuit 20, and the voltage at the output end of the power supply module 110 will not be quickly pulled down, and the bus voltage Vg provided by the power supply bus 10 will not drop. When the voltage at the output end of the power supply module 110 is less than or equal to the preset voltage, the first switch module 120 outputs a first control signal, and the second switch module 130 outputs a disconnection signal to the controlled end of the power supply module 110 based on the first control signal, thereby controlling the power supply module 110 to disconnect the path between the power supply bus 10 and the target circuit 20, which can prevent the bus voltage Vg provided by the power supply bus 10 from being affected by the short circuit of the target circuit 20 and causing a voltage drop, and can effectively ensure that the normal operation of other circuits connected to the power supply bus 10 is not affected.

[0054] In the implementation manner of the present application, by adding a first switch module 120 and a second switch module 130 on the basis of the power supply module 110, when a short circuit occurs in the target circuit 20, a circuit breaker signal can be output to the power supply module 110 through the first switch module 120 and the second switch module 130, so that the power supply module 110 can be controlled to disconnect the power supply of the power supply bus 10 to the target circuit 20 in time, which can effectively prevent the bus voltage Vg provided by the power supply bus 10 from being quickly pulled down and causing power failure, and can solve the problem of a voltage drop in the bus voltage Vg caused by a short circuit in the target circuit 20.

[0055] In one embodiment, please refer to Figure 2 , Figure 2 This is a circuit diagram of an implementation of the first switch module provided in an embodiment of the present application. Figure 2As shown, the first switch module 120 includes a first voltage stabilizing unit 121, a first switch unit 122 and a filter unit 123. The first end Va of the first voltage stabilizing unit 121 is connected to the output end of the power supply module 110 as the first end of the first switch module 120. The second end of the first voltage stabilizing unit 121 is connected to the controlled end of the first switch unit 122. The first end of the first switch unit 122 is used for grounding, and the second end Vb of the first switch unit 122 is used as the second end of the first switch module 120, and is connected to the first end of the second switch module 130. The second end Vb of the first switch unit 122 is also used to access the first voltage source VCC1. The filter unit 123 is connected between the controlled end and the first end of the first switch unit 122.

[0056] It should be noted that the first voltage source VCC1 is used to provide a first preset voltage, and the first preset voltage is, for example, 3.3V. The first switch unit 122 outputs a first control signal when the voltage at the output end of the power supply module 110 is less than or equal to a preset voltage, and the preset voltage can be set according to the voltage drop of the first voltage stabilizing unit 121 and the first switch unit 122. For example, the preset voltage can be equal to the sum of the stabilizing voltage of the first voltage stabilizing unit 121 and the cut-off voltage of the first switch unit 122. Therefore, the value of the preset voltage can be changed by adjusting the voltage drop of the first voltage stabilizing unit 121 and the first switch unit 122. In practical applications, the specific structure of the first switch module 120 can also be different from Figure 2 different.

[0057] In some examples, such as Figure 3 As shown, the first voltage stabilizing unit 121 includes a first diode D1 and a second diode D2. The cathode of the first diode D1 serves as the first end Va of the first voltage stabilizing unit 121, and is connected to the output end of the power supply module 110. The anode of the first diode D1 is connected to the anode of the second diode D2. The cathode of the second diode D2 serves as the second end of the first voltage stabilizing unit 121, and is connected to the controlled end of the first switch unit 122. Among them, the first diode D1 is a voltage stabilizing diode, and the second diode D2 is an anti-reverse diode. The voltage drop of the first voltage stabilizing unit 121 can be equal to the sum of the voltage stabilizing value of the first diode D1 and the voltage drop value of the second diode D2. The voltage stabilizing effect of the first voltage stabilizing unit 121 is achieved by the first diode D1 and the second diode D2, which is simple and reliable.

[0058] In some examples, such as Figure 3As shown, the first switch unit 122 includes a first resistor R2, a first switch tube Q1 and a second resistor R3. The gate (G pole) of the first switch tube Q1 serves as the controlled end of the first switch unit 122, and the source (S pole) of the first switch tube Q1 serves as the first end of the first switch unit 122, which is used for grounding. The drain (D pole) of the first switch tube Q1 serves as the second end of the first switch unit 122. The first resistor R2 is connected between the gate (G pole) of the first switch tube Q1 and the second end of the first voltage stabilizing unit 121. The second resistor R3 is connected between the drain (D pole) of the first switch tube Q1 and the first voltage source VCC1. Among them, the first switch tube Q1 may include a triode, a MOS tube (metal oxide semiconductor field effect tube) and an IGBT tube (insulated gate bipolar transistor), etc.

[0059] In some examples, such as Figure 3 As shown, the filter unit 123 includes a resistor R1 and a capacitor C3 connected in parallel, and the resistor R1 and the capacitor C3 are connected between the gate (G pole) and the source (S pole) of the first switch tube Q1. In practical applications, the filter unit 123 can also be removed, or different from Figure 3 The specific structure shown is not specifically limited in this application.

[0060] In one embodiment, please refer to Figure 4 , Figure 4 This is a circuit diagram of an implementation of the second switch module provided in an embodiment of the present application. Figure 4 As shown, the second switch module 130 includes a second switch unit, and the second switch unit includes a third resistor R4, a second switch tube Q2 and a fourth resistor R5. The gate (G pole) of the second switch tube Q2 is connected to the second end Vb of the first switch module 120 through the third resistor R4, the source (S pole) of the second switch tube Q2 is used for grounding, and the drain (D pole) of the second switch tube Q2 is connected to the controlled end Lock of the power supply module 110 through the fourth resistor R5.

[0061] Among them, the second switch tube Q2 may include a triode, a MOS tube, an IGBT tube, etc. The second switch tube Q2 outputs a disconnection signal when receiving the first control signal, and the disconnection signal may be a high level signal or a low level signal. After receiving the disconnection signal, the power supply module 110 disconnects the path between the power supply bus 10 and the target circuit 20, thereby causing a short circuit in the target circuit 20 to avoid a voltage drop in the bus voltage Vg. Figure 4 The second switch module 130 shown is only an example. In actual applications, the specific structure of the second switch module 130 may be different from the above. Figure 4 different.

[0062] In one embodiment, if Figure 5As shown, the power supply module 110 includes a third switch unit 111, a fourth switch unit 112 and a voltage output unit 113. Among them, the controlled end of the third switch unit 111 serves as the controlled end Lock of the power supply module 110 and is connected to the second end Vb of the first switch unit 122. The first end of the third switch unit 111 is grounded, and the second end of the third switch unit 111 is connected to the controlled end of the fourth switch unit 112. The first end of the fourth switch unit 112 serves as the input end of the power supply module 110 and is used to access the bus voltage Vg provided by the power supply bus 10. The second end of the fourth switch unit 112 is connected to the first end of the voltage output unit 113, and the second end of the voltage output unit 113 serves as the output end of the power supply module 110 and is connected to the first end Va of the first voltage stabilizing unit 121. The second end of the voltage output unit 113 is also used to connect the target circuit 20.

[0063] In some examples, such as Figure 6 As shown, the third switch unit 111 includes a switch tube Q3, a resistor R6, a capacitor C2, a diode D3 and a resistor R8. Among them, the gate (G pole) of the switch tube Q3 serves as the controlled end Lock of the power supply module 110, the source (S pole) of the switch tube Q3 is grounded, and the drain (D pole) of the switch tube Q3 is connected to the controlled end of the fourth switch unit 112 through the resistor R8. Among them, the gate of the switch tube Q3 can also be connected to the voltage source B+ through the resistor R7 and the diode D4, and the voltage source B+ is, for example, the positive electrode of the battery voltage. Resistor R6, capacitor C2, and diode D3 are connected in parallel between the gate and source of the switch tube Q3. Diode D3 is a damping diode, which can provide a discharge path for the reverse electromotive force extraction, thereby protecting the switch tube Q3.

[0064] In some examples, such as Figure 6 As shown, the fourth switch unit 112 includes a switch tube Q4, a resistor R9, a capacitor C3 and a diode D5. Among them, the gate (G pole) of the switch tube Q4 serves as the controlled end of the fourth switch unit 112, the source (S pole) of the switch tube Q3 is used to access the bus voltage Vg, and the drain (D pole) of the switch tube Q3 is connected to the first end of the voltage output unit 113. Among them, the resistor R9, the capacitor C3 and the diode D5 are connected in parallel between the gate and the source of the switch tube Q4. The diode D5 is a damping diode that can provide a discharge path for the reverse electromotive force extraction, thereby protecting the switch tube Q4.

[0065] In some examples, such as Figure 6As shown, the voltage output unit 113 includes a resistor R10, a resistor R11, a resistor R12, and a resistor R14 connected in series and parallel. In practical applications, the voltage output unit 113 can be composed of a larger number of resistors, and the connection relationship between the resistors can be set as needed. In some examples, the voltage output unit 113 can also be connected to the target circuit 20 through an anti-reverse diode D6 to prevent voltage shocks in the target circuit 20.

[0066] In one embodiment, please refer to Figure 7 , Figure 7 This is a circuit diagram of an implementation of a power supply circuit provided in an embodiment of the present application. Figure 7 As shown, the power supply circuit 100 further includes a power restoration module 140, which is connected to the first switch module 120. The power restoration module 140 is configured to output a power restoration signal to the first switch module 120 based on the received power restoration instruction.

[0067] The first switch module 120 is also used to output a second control signal to the second switch module 130 when receiving the power recovery signal. The second switch module 130 is also used to output a path signal to the controlled end of the power supply module 110 when receiving the second control signal, and the path signal is used to instruct the power supply module 110 to open the circuit between the power supply bus 10 and the target circuit 20.

[0068] It should be noted that the power-on instruction can be triggered by the user, for example, the user generates the power-on instruction by triggering the power-on button. The power-on instruction can also be triggered automatically, for example, the control unit can start timing after the power supply module 110 disconnects the power supply, and output the power-on instruction to the power-on module 140 after the timing time reaches the set time. The power-on signal is used to control the first switch module 120 to output the second control signal to the second switch module 130, and the second control signal is used to control the second switch module 130 to output a path signal to the power supply module 110, so as to control the power supply module 110 to conduct the circuit breakers between the power supply bus 10 and the target circuit 20, so that the power supply to the target circuit 20 can be restored after the power supply module 110 disconnects the power supply.

[0069] For example, Figure 8 This is a circuit diagram of an implementation of a power recovery module provided in an embodiment of the present application. Figure 8 As shown, the power restoration module 140 includes a signal trigger unit 141 and a control unit 142, the signal trigger unit 141 is connected to the control unit 142, and the signal trigger unit 141 is connected to the first switch unit 122. The signal trigger unit 141 is used to output a trigger signal to the control unit 142 when a power restoration operation on the target circuit 20 is detected. The control unit 142 is also used to output a power restoration signal to the first switch unit 122 when receiving the trigger signal.

[0070] It should be noted that after the target circuit 20 has been cleared of the circuit breaker or other faults, the target circuit 20 can be restored to power, for example, the user can trigger a restoration button or a power-on button. The signal trigger unit 141 can detect the restoration of power to the target circuit 20, and can output a trigger signal to the control unit 142 when the restoration of power to the target circuit 20 is detected. The control unit 142 can output a restoration signal to the first switch unit 122 upon receiving the trigger signal. The restoration module 140 composed of the signal trigger unit 141 and the control unit 142 can conveniently implement the restoration function, and has high practicality.

[0071] For example, Fig. 9 As shown, the signal trigger unit 141 includes a signal trigger subunit 1411, a switch subunit 1412 and a voltage stabilizing subunit 1413. The signal trigger subunit 1411 is connected to the first end of the switch subunit 1412, and the signal trigger subunit 1411 is used to output a first level signal to the switch subunit 1412 when detecting a power-on operation on the target circuit 20. The second end of the switch subunit 1412 is used to connect to a second voltage source, and the third end of the switch subunit 1412 is connected to the voltage stabilizing subunit 1413; the switch subunit 1412 is used to output a second level signal to the voltage stabilizing subunit 1413 when receiving the first level signal. The voltage stabilizing subunit 1413 is connected to the control unit 142, and the voltage stabilizing subunit 1413 is used to stabilize the second level signal to obtain a trigger signal, and output the trigger signal to the control unit 142.

[0072] Among them, the signal trigger subunit 1411 may include a trigger device, through which a first level signal can be generated, and the trigger device is, for example, a power-on button or a power-on button. The second voltage source is used to output a second preset voltage, and the second preset voltage is, for example, 13.2V. Through the signal trigger subunit 1411, the switch subunit 1412 and the voltage stabilizing subunit 1413, the signal trigger function of the signal trigger unit 141 can be realized, and the circuit performance is relatively stable and not prone to errors.

[0073] For example, Fig.10As shown, the signal trigger subunit 1411 includes a button SW1, the switch subunit 1412 includes a resistor R14 and a switch tube Q5, the voltage stabilizing subunit 1413 includes an LDO chip (low dropout voltage stabilizing chip), and the control unit 142 includes an MCU chip. The switch subunit 1412 is also connected to a third voltage source, which may include a battery voltage positive electrode B+ and a first voltage source VCC1, the battery voltage positive electrode B+ can be connected to the S pole of the switch tube Q5 through a DC-DC circuit (DC / DC conversion circuit), and the first voltage source VCC1 can be connected to the S pole of the switch tube Q5 through an LDO chip. The user can trigger the button SW1 to output a low-level first-level signal to the controlled end of the switch tube Q5 through the resistor R14. The switch tube Q5 is turned on when receiving the low-level first-level signal, thereby outputting a high-level second-level signal to the voltage stabilizing subunit 1413. After the second-level signal is stabilized by the LDO chip, it is output to the MCU chip, and the MCU chip outputs a repower signal oBTPwrEn.

[0074] In one embodiment, the first switch module 120 is provided with a voltage sampling point, and the control unit 142 is also connected to the voltage sampling point; the control unit 142 is also used to determine the number of short circuits of the target circuit 20 according to the voltage information of the voltage sampling point, and enter a locked state when the number of short circuits is greater than or equal to a set number of times; the control unit 142 in the locked state does not output a power-on signal when receiving a trigger signal.

[0075] It should be noted that, by setting the voltage sampling point, it is possible to continue to detect whether the target circuit 20 has a short circuit after the target circuit 20 is powered on. If the short circuit still exists after the target circuit 20 is powered on, the voltage information of the voltage sampling point can be a low level to a high level. Therefore, according to the voltage information of the voltage sampling point, it is possible to accurately determine whether the target circuit 20 has a short circuit and record the number of short circuits of the target circuit 20, so that when the number of short circuits of the target circuit 20 is greater than or equal to the set number, the control unit 142 can enter a locked state, thereby locking the control unit 142, so that the control unit 142 does not output a power-on signal when receiving a trigger signal, that is, the control unit 142 in the locked state cannot realize the power-on of the target circuit 20.

[0076] For example, Fig.11 As shown, the first switch module is provided with a voltage sampling point iLock, and the control unit is also connected to the voltage sampling point iLock; the control unit is also used to determine the number of short circuits of the target circuit according to the voltage information of the voltage sampling point iLock, and enter the locked state when the number of short circuits is greater than or equal to the set number of times. The control unit in the locked state does not output the power-recovery signal oBTPwrEn when receiving a trigger signal.

[0077] The power supply circuit 100 of the above embodiment includes a power supply module 110, a first switch module 120 and a second switch module 130. The input end of the power supply module 110 is used to connect to the power supply bus 10, the output end of the power supply module 110 is used to connect to the target circuit 20, and the power supply module 110 is used to use the power supply bus 10 to provide power to the target circuit 20. The first end of the first switch module 120 is connected to the output end of the power supply module 110, and the first switch module 120 is used to output a first control signal when the voltage at the output end of the power supply module 110 is less than or equal to a preset voltage. The first end of the second switch module 130 is connected to the second end of the first switch module 120, and the second end of the second switch module 130 is connected to the controlled end of the power supply module 110. The second switch module 130 is used to output a disconnection signal to the controlled end of the power supply module 110 when receiving the first control signal, so that the power supply module 110 disconnects the passage between the power supply bus 10 and the target circuit 20. The power supply circuit of the present application adds a first switch module 120 and a second switch module 130 on the basis of the power supply module 110. When a short circuit occurs in the target circuit 20, a circuit-breaking signal can be output to the power supply module 110 through the first switch module 120 and the second switch module 130, so that the power supply module 110 can be controlled to disconnect the passage between the power supply bus 10 and the target circuit 20 in time, thereby preventing the bus voltage Vg provided by the power supply bus 10 from being quickly pulled down and causing power failure, and ensuring the normal operation of other circuits connected to the power supply bus 10.

[0078] See also Fig.11 The following is a specific description of the application of the power supply circuit provided in the embodiment of the present application to a BMS (battery management system) board as an example:

[0079] Among them, illustratively, B+ is the positive pole of the battery output, the bus voltage Vg can be 13.2V (always powered) generated by the auxiliary source, the bus voltage Vg can be output through the power supply bus at the DC-DC, VCC1 is the 3.3V (always powered) of the internal RTC clock chip (RTC, Real Time Clock / Calendar), BTPwr is the output end of the power supply module (can be used to power the Bluetooth module or PD board), VDD1 is used to power the MCU, and VDD1 can also be 3.3V.

[0080] First, if there is no increase Fig.11The first switch module and the second switch module in the dotted box. When a short circuit occurs in the target circuit, the voltage BTPwr at the output end of the power supply module is pulled down to zero. Since Q4 is in the on state, the bus voltage Vg drops and is also pulled down to zero. At this time, the other circuits of the BMS board are powered off and cannot work. When the BMS board is assembled to the battery cell, B+ and the bus voltage Vg are both energized, so that Q3 and Q4 are turned on. At this time, BTPwr is connected to the bus voltage Vg.

[0081] Second, increase Fig.11 After the first switch module and the second switch module in the dotted box. When the BMS board is assembled to the battery cell, B+, Vg and VCC1 are powered on first, at this time Q2 is turned on, Q1 is turned off, Q3 is turned off, Q4 is turned off, and BTPwr has no output voltage, ensuring that BTPwr is not powered during the assembly process.

[0082] If the target circuit is not short-circuited, the output oBTPwrEn signal is high, Q1 is turned on, Q2 is turned off, Q3 is turned on, and Q4 is turned on. If the target circuit is short-circuited, the output oBTPwrEn signal is low, Q1 is turned off, and the gate of Q2 is pulled high by VCC1, Q2 is turned on, and the LOCK signal is pulled to the ground, so that Q3 is turned off, thereby turning off Q4, and the power supply module stops supplying power to the target circuit.

[0083] Subsequently, after the SW1 button is turned on, Q5 is turned on, and after the MCU is powered on, oBTPwrEn is pulled high, Q1 is turned on, Q2 is turned off, Q3 is turned on, and Q4 is turned on, so that Vg and BTPwr are connected, and BTPwr can output normally.

[0084] Please refer to Fig.12 , Fig.12 A schematic block diagram of a power supply device provided in an embodiment of the present application.

[0085] like Fig.12 As shown, the power supply device 200 includes: a power supply circuit 210 .

[0086] The power supply circuit 210 may be the power supply circuit 100 of the above embodiment. The power supply device 200 may also include but is not limited to circuit modules such as a DC power supply, a rectifier circuit, and a voltage regulating circuit (such as an inverter circuit, a DC-AC conversion circuit).

[0087] In one embodiment, the power supply device 200 may further include a target circuit, and the target circuit may be, for example, a PD (Power Delivery) circuit, a Bluetooth circuit, or the like.

[0088] In one embodiment, the power supply device 200 further includes a battery module, which includes one or more electrical energy storage units, such as one or more batteries. Multiple batteries can be connected in series or in parallel to form the battery module.

[0089] It can be understood that the beneficial effects that can be achieved by the power supply device provided in the embodiment of the present application can refer to the beneficial effects of the power supply circuit in the corresponding embodiment provided above, and will not be repeated here.

[0090] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A power supply circuit, characterized in that: include: A power supply module, wherein the input end of the power supply module is used to connect to the power supply bus, and the output end of the power supply module is used to connect to the target circuit; The power supply module is used to use the bus voltage provided by the power supply bus to supply power to the target circuit; a first switch module, wherein a first end of the first switch module is connected to an output end of the power supply module, and the first switch module is configured to output a first control signal when a voltage at the output end of the power supply module is less than or equal to a preset voltage; A second switch module, wherein the first end of the second switch module is connected to the second end of the first switch module, and the second end of the second switch module is connected to the controlled end of the power supply module, and the second switch module is used to output a circuit-breaking signal to the controlled end of the power supply module when receiving the first control signal, so that the power supply module disconnects the path between the power supply bus and the target circuit.

2. The power supply circuit according to claim 1, characterized in that: The first switch module includes a first voltage stabilizing unit, a first switch unit and a filter unit; The first end of the first voltage stabilizing unit serves as the first end of the first switch module, and the second end of the first voltage stabilizing unit is connected to the controlled end of the first switch unit; The first end of the first switch unit is used for grounding, the second end of the first switch unit serves as the second end of the first switch module, and the second end of the first switch unit is also used for connecting to a first voltage source; The filter unit is connected between the controlled end and the first end of the first switch unit.

3. The power supply circuit according to claim 2, characterized in that: The first voltage stabilizing unit includes a first diode and a second diode; the cathode of the first diode serves as the first end of the first voltage stabilizing unit, the anode of the first diode is connected to the anode of the second diode, and the cathode of the second diode serves as the second end of the first voltage stabilizing unit.

4. The power supply circuit according to claim 2, characterized in that: The first switch unit includes a first resistor, a first switch tube and a second resistor; The gate of the first switch tube serves as the controlled end of the first switch unit, the source of the first switch tube serves as the first end of the first switch unit, and the drain of the first switch tube serves as the second end of the first switch unit; The first resistor is connected between the gate of the first switch tube and the second end of the first voltage stabilizing unit; the second resistor is connected between the drain of the first switch tube and the first voltage source.

5. The power supply circuit according to claim 1, characterized in that: The second switch module includes a third resistor, a second switch tube and a fourth resistor; The gate of the second switch tube is connected to the second end of the first switch module through the third resistor, the source of the second switch tube is used for grounding, and the drain of the second switch tube is connected to the controlled end of the power supply module through the fourth resistor.

6. The power supply circuit according to any one of claims 1 to 5, characterized in that: The power supply circuit further includes a power restoration module, which is connected to the first switch module; the power restoration module is used to output a power restoration signal to the first switch module based on a received power restoration instruction; The first switch module is also used to output a second control signal to the second switch module when receiving the power-reply signal; the second switch module is also used to output a path signal to the controlled end of the power supply module when receiving the second control signal, and the path signal is used to instruct the power supply module to open the circuit between the power supply bus and the target circuit.

7. The power supply circuit according to claim 6, characterized in that: The power restoration module includes a signal trigger unit and a control unit, the signal trigger unit is connected to the control unit, and the control unit is connected to the first switch module; The signal trigger unit is used to output a trigger signal to the control unit when a power-on operation to the target circuit is detected; the control unit is also used to output the power-on signal to the first switch module when receiving the trigger signal.

8. The power supply circuit according to claim 7, characterized in that: The signal trigger unit includes a signal trigger subunit, a switch subunit and a voltage stabilization subunit; The signal trigger subunit is connected to the first end of the switch subunit, and the signal trigger subunit is used to output a first level signal to the switch subunit when detecting a power-on operation on the target circuit; The second end of the switch subunit is used to connect to the second voltage source, and the third end of the switch subunit is connected to the voltage stabilizing subunit; the switch subunit is used to output a second level signal to the voltage stabilizing subunit when receiving the first level signal; The voltage stabilizing subunit is connected to the control unit, and is used for stabilizing the second level signal to obtain a trigger signal, and outputting the trigger signal to the control unit.

9. The power supply circuit according to claim 7, characterized in that: The first switch module is provided with a voltage sampling point, and the control unit is also connected to the voltage sampling point; the control unit is also used to determine the number of short circuits of the target circuit according to the voltage information of the voltage sampling point, and enter a locked state when the number of short circuits is greater than or equal to a set number; the control unit in the locked state does not output the power-on signal when receiving the trigger signal.

10. A power supply device, characterized in that: The invention comprises a power supply circuit as claimed in any one of claims 1 to 9.

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