Power supply circuit and vehicle battery management system

Abstract

The application relates to a power supply circuit and a vehicle battery management system. The power supply circuit comprises at least two power supply switching modules, each of which is used for accessing a group of external power supplies, and each of which comprises a first switch unit and an ideal diode controller. The first end of the first switch unit is connected with the external power supply and connected with the anode pin of the ideal diode controller. The second end of the first switch unit is connected with a load and connected with the cathode pin of the ideal diode controller. The control end of the first switch unit is connected with the gate pin of the ideal diode controller. The ideal diode controller is used for receiving an enable signal to control the conduction or cut-off of the first switch unit. The power supply circuit can improve the stability of redundant power supply.

Description

Technical Field

[0001] This application relates to the field of vehicle battery management system technology, and in particular to a power supply circuit and a vehicle battery management system. Background Technology

[0002] A vehicle battery management system (BMS) is a system that monitors vehicle batteries and is primarily used to ensure that batteries operate safely, reliably, and efficiently.

[0003] Traditional technologies often employ redundant power supply circuits composed of diodes to provide dual power to the vehicle battery management system. However, diodes often have significant voltage drops (e.g., 0.6-0.8V for silicon diodes and 0.2V-0.3V for germanium diodes). This results in substantial power loss in the diodes of the redundant power supply circuit. The redundant power supply circuit also needs to consider heat dissipation issues, and long-term use can lead to a shortened lifespan, affecting the reliability of the vehicle battery management system's power supply.

[0004] Therefore, redundant power supply circuits in traditional technologies suffer from low reliability. Utility Model Content

[0005] Therefore, it is necessary to provide a power supply circuit and vehicle battery management system that can improve the reliability of redundant power supply.

[0006] A power supply circuit, comprising:

[0007] At least two power switching modules, each power switching module is used to connect to a set of external power supplies, and each power switching module includes a first switching unit and an ideal diode controller;

[0008] The first terminal of the first switching unit is connected to the external power supply and to the anode pin of the ideal diode controller; the second terminal of the first switching unit is connected to the load and to the cathode pin of the ideal diode controller; the control terminal of the first switching unit is connected to the gate pin of the ideal diode controller.

[0009] The ideal diode controller is used to receive an enable signal to control the conduction or cutoff of the first switching unit.

[0010] In one embodiment, the power switching module further includes:

[0011] The control unit has a first terminal connected to the enable pin of the ideal diode controller; the control unit is used to output the enable signal.

[0012] In one embodiment, the power switching module further includes:

[0013] A power detection unit is provided, one end of which is connected to the external power source, and the other end of which is connected to the second end of the control unit. The control unit is used to collect voltage information of the external power source through the power detection unit.

[0014] In one embodiment, the power detection unit includes a first resistor, a second resistor, and a second switching unit;

[0015] The first terminal of the second switching unit is connected to the external power supply through the first resistor, the second terminal of the second switching unit is grounded through the second resistor, the control terminal of the second switching unit is connected to the first terminal of the control unit, and the second terminal of the second switching unit is connected to the second terminal of the control unit.

[0016] In one embodiment, the power detection unit further includes:

[0017] A third resistor, one end of which is connected to the second terminal of the second switching unit, and the other end of which is connected to the second terminal of the control unit.

[0018] In one embodiment, the enable pin of the ideal diode controller is connected to the external power supply so that the external power supply serves as the enable signal.

[0019] In one embodiment, the power switching module further includes:

[0020] An internal power supply is provided, and the enable pin of the ideal diode controller is connected to the internal power supply to use the internal power supply as the enable signal.

[0021] In one embodiment, the power switching module further includes:

[0022] A transient voltage suppressor diode, one end of which is connected to the external power supply, and the other end of which is grounded.

[0023] In one embodiment, the power switching module further includes:

[0024] A first capacitor, one end of which is connected to the external power supply, and the other end of which is grounded.

[0025] In one embodiment, the power switching module further includes:

[0026] The second capacitor has one end connected to the anode pin of the ideal diode controller and the other end connected to the capacitor pin of the ideal diode controller.

[0027] In one embodiment, the power switching module further includes:

[0028] The third capacitor has one end connected to the cathode pin of the ideal diode controller and the other end grounded.

[0029] A vehicle battery management system includes the power supply circuit described above.

[0030] The aforementioned power supply circuit includes at least two power switching modules, each used to connect to a set of external power supplies. Each module includes a first switching unit and an ideal diode controller. The first terminal of the first switching unit is connected to the external power supply and to the anode pin of the ideal diode controller. The second terminal of the first switching unit is connected to the load and to the cathode pin of the ideal diode controller. The control terminal of the first switching unit is connected to the gate pin of the ideal diode controller. This parallel connection allows the ideal diode controller to effectively control the first switching unit to turn on or off based on an enable signal, achieving automatic switching between dual power supplies. Furthermore, this power supply circuit features small size, low voltage drop and heat dissipation, simple wiring, and reliable control, effectively improving the operational reliability of vehicle battery management systems using this power supply circuit for redundant power supply. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a power supply circuit according to one embodiment;

[0033] Figure 2 for Figure 1 A modular structure of a power switching module;

[0034] Figure 3 for Figure 1 Another module structure for the power switching module;

[0035] Figure 4 for Figure 1 Another module structure for the power switching module;

[0036] Figure 5 This is a power supply circuit for another embodiment;

[0037] Figure 6 One embodiment is a power switching module;

[0038] Figure 7 Another embodiment of the vehicle battery management system.

[0039] Explanation of reference numerals in the attached figures: 100 is the power switching module; 102 is the first switching unit; 104 is the ideal diode controller; 106 is the control unit; 108 is the power detection unit; 110 is the internal power supply; 200 is the external power supply; 300 is the load. Detailed Implementation

[0040] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0042] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0043] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0044] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0045] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0046] like Figure 1 As shown, a power supply circuit of one embodiment includes: at least two power switching modules 100, each power switching module 100 is used to connect to a group of external power supplies 200, and each power switching module 100 includes a first switching unit 102 and an ideal diode controller 104.

[0047] The first terminal of the first switching unit 102 is connected to the external power supply 200 and to the anode pin of the ideal diode controller 104; the second terminal of the first switching unit 102 is connected to the load 300 and to the cathode pin of the ideal diode controller 104; and the control terminal of the first switching unit 102 is connected to the gate pin of the ideal diode controller 104.

[0048] The ideal diode controller 104 receives an enable signal to control the on or off state of the first switching unit 102. Specifically, when the enable pin (EN pin) of the ideal diode controller 104 receives a valid enable signal, the ideal diode controller 104 starts operating; when the enable pin of the ideal diode controller 104 does not receive an enable signal, the ideal diode controller 104 is in a low-power or off state and does not control the connected power path.

[0049] Since the anode pin of the ideal diode controller 104 is connected to the external power supply 200, and the cathode pin of the ideal diode controller 104 is connected to the load 300, the ideal diode controller 104 detects a forward voltage difference when current flows from the ANODE to the CHODE of the ideal diode controller 104. At this time, the ideal diode controller 104 applies a suitable drive voltage signal to the control terminal of the first switching unit 102 through the GATE pin, causing the first switching unit 102 to be in the conducting state. When the first switching unit 102 is in the conducting state, due to the extremely low on-resistance of the first switching unit 102, a current path with approximately zero voltage drop is formed, and the current flows smoothly from the anode to the cathode, just as there is no voltage loss when the ideal diode is forward-biased.

[0050] When current flows from the cathode to the anode of the ideal diode controller 104, the ideal diode controller 104 detects a reverse voltage difference. At this time, the ideal diode controller 104 can stop applying the drive voltage signal to the control terminal of the first switching unit 102, so that the first switching unit 102 is in the off state, thereby preventing the aforementioned reverse current from passing through and achieving a function similar to the reverse cutoff of an ideal diode, preventing the reverse current from damaging other parts of the circuit.

[0051] In practical applications, the first switching unit can use a single MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or multiple MOSFETs connected in parallel. The MOSFET can be either a P-type or an N-type MOSFET.

[0052] Optionally, the enable pin of the ideal diode controller can be connected to an external power supply to use the external power supply 200 as an enable signal, such as... Figure 2 As shown.

[0053] In practical applications, the enable signal can be at least one of external power supply, internal power supply, or internal pull-up voltage signal.

[0054] The aforementioned power supply circuit includes at least two power switching modules, each used to connect to a set of external power supplies. Each module includes a first switching unit and an ideal diode controller. The first terminal of the first switching unit is connected to the external power supply and to the anode pin of the ideal diode controller. The second terminal of the first switching unit is connected to the load and to the cathode pin of the ideal diode controller. The control terminal of the first switching unit is connected to the gate pin of the ideal diode controller. This parallel connection allows the ideal diode controller to effectively control the first switching unit to turn on or off based on an enable signal, achieving automatic switching between dual power supplies. Furthermore, the power supply circuit features small size, low voltage drop and heat dissipation, simple circuitry, and reliable control, effectively improving the operational reliability of redundant power supply.

[0055] In one embodiment, such as Figure 3 As shown, the power switching module 100 also includes a control unit 106, the first end of which is connected to the enable pin of the ideal diode controller 104; the control unit 106 is used to output an enable signal.

[0056] In a specific implementation, the power switching module 100 includes a control unit 106, whose enable signal output is connected to the enable pin of the ideal diode controller 104. The control unit 106 can trigger the ideal diode controller 104 to start working by applying a suitable enable signal (e.g., a pull-up voltage signal) to the enable pin of the ideal diode controller 104. If the enable pin of the ideal diode controller 104 does not receive an enable signal output from the control unit 106, the ideal diode controller 104 is in a low-power or off state and does not control the connected power path.

[0057] The technical solution of this embodiment, by setting a control unit in the power switching module, with the first end of the control unit connected to the enable pin of the ideal diode controller, can realize the control of the working state of the power switching module through the control unit.

[0058] In one embodiment, such as Figure 4 As shown, the power switching module 100 further includes a power detection unit 108, one end of which is connected to an external power supply 200, and the other end of which is connected to a second end of a control unit 106; the control unit 106 is used to collect voltage information of the external power supply 200 through the power detection unit 108.

[0059] In a specific implementation, the power switching module 100 also includes a power detection unit 108. One end of the power detection unit 108 is connected to the external power supply 200, and the other end of the power detection unit 108 is connected to the second end of the control unit 106. The control unit 106 can collect the voltage information of the external power supply 200 in real time through the power detection unit 108.

[0060] Specifically, the control unit 106 can collect the voltage information of the external power supply 200 in real time through the power detection unit 108. When the control unit 106 detects abnormal conditions such as voltage fluctuation, overvoltage, or undervoltage of the external power supply 200, the control unit 106 can apply an appropriate enable signal (e.g., a pull-up voltage signal) to the enable pin of the ideal diode controller 104 to trigger the ideal diode controller 104 to stop applying the drive voltage signal to the control terminal of the first switching unit 102, so that the first switching unit 102 is in the off state. This can realize automatic switching to another external power supply, avoid damage to the BMS controller due to power supply problems, and ensure the continuity and stability of the power supply of the BMS controller.

[0061] For ease of understanding by those skilled in the art, please refer to Figure 5 , Figure 5Another embodiment of the power supply circuit includes two power switching modules 100, namely a first power switching module and a second power switching module.

[0062] The first power switching module may include an ideal diode controller U1 and a MOSFET Q1, where Q1 is an N-MOS transistor. The source of MOSFET Q1 is connected to the external power supply VIN1 and to the anode (ANODE) ​​pin of the ideal diode controller U1. The drain of MOSFET Q1 is connected to the load via the output terminal VOUT and to the cathode (CATHODE) pin of the ideal diode controller U1. The gate of MOSFET Q1 is connected to the gate (GATE) pin of the ideal diode controller U1. The enable (EN) pin of the ideal diode controller U1 is connected to an enable signal. In practical applications, the enable signal can be at least one of the following: external power supply VIN1, internal 5V power supply, or internal pull-up voltage signal.

[0063] The second power switching module may include an ideal diode controller U2 and a MOSFET Q3, where Q3 is an N-MOS transistor. The source of Q3 is connected to the external power supply VIN2 and to the anode (ANODE) ​​pin of the ideal diode controller U2. The drain of Q3 is connected to the load via the output terminal VOUT and to the cathode (CATHODE) pin of the ideal diode controller U2. The gate of Q3 is connected to the gate (GATE) pin of the ideal diode controller U2. The enable (EN) pin of the ideal diode controller U2 is connected to an enable signal. In practical applications, the enable signal can be at least one of the following: external power supply VIN2, internal 5V power supply, or internal pull-up voltage signal.

[0064] In one embodiment, the power detection unit includes a first resistor, a second resistor, and a second switch unit; the first terminal of the second switch unit is connected to an external power source through the first resistor, the second terminal of the second switch unit is grounded through the second resistor, the control terminal of the second switch unit is connected to the first terminal of the control unit, and the second terminal of the second switch unit is connected to the second terminal of the control unit.

[0065] In practical applications, the second switching unit can be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). In practical applications, the MOSFET can be a P-type MOSFET or an N-type MOSFET.

[0066] In a specific implementation, taking an N-type MOSFET as an example, the power detection unit may include a first resistor, a second resistor, and an N-type MOSFET. The drain of the N-type MOSFET can be connected to the external power supply 200 through the first resistor, the source of the N-type MOSFET can be grounded through the second resistor, and the gate of the N-type MOSFET is connected to the enable signal output terminal of the control unit. Additionally, the source of the N-type MOSFET is connected to the acquisition terminal of the control unit.

[0067] The control unit 106 can trigger the N-type MOSFET to be in the conducting state by applying a suitable enable signal (e.g., a pull-up voltage signal) to the gate of the N-type MOSFET. When the N-type MOSFET is in the conducting state, the first resistor and the second resistor are connected in series to divide the voltage. Since the resistance values ​​of the first resistor and the second resistor are known, the control unit 106 can obtain the voltage of the external power supply 200 by measuring the voltage division across the second resistor, thereby realizing real-time acquisition of the voltage information of the external power supply 200.

[0068] Please see again. Figure 5 The first power switching module may also include resistors R1 and R2 and MOSFET Q2; wherein, the drain of MOSFET Q2 can be connected to the external power supply VIN1 through resistor R1, and the source of MOSFET Q2 can be grounded to GND through resistor R2; the source of MOSFET Q2 can also be connected to the acquisition terminal of the control unit; the gate of MOSFET Q2 is connected to the enable signal output terminal of the control unit.

[0069] The second power switching module may also include resistors R4 and R5 and a MOSFET Q4; wherein, the drain of MOSFET Q4 can be connected to the external power supply VIN2 through resistor R4, and the source of MOSFET Q4 can be grounded to GND through resistor R5; the source of MOSFET Q4 can also be connected to the acquisition terminal of the control unit; the gate of MOSFET Q4 is connected to the enable signal output terminal of the control unit.

[0070] In one embodiment, the power detection unit further includes a third resistor, one end of which is connected to the second terminal of the second switching unit, and the other end of which is connected to the second terminal of the control unit.

[0071] For specific implementation details, please refer to [link / reference]. Figure 5 The first power switching module may also include a resistor R3, one end of which is connected to the source of the MOSFET Q2, and the other end of which is connected to the acquisition terminal of the control unit; that is, the source of the MOSFET Q2 is connected to the acquisition terminal of the control unit through the resistor R3.

[0072] The second power switching module may also include a resistor R6, one end of which is connected to the source of the MOSFET Q4, and the other end of which is connected to the acquisition terminal of the control unit; that is, the source of the MOSFET Q4 is connected to the acquisition terminal of the control unit through the resistor R6.

[0073] The technical solution of this embodiment provides a third resistor in the power detection unit. One end of the third resistor is connected to the second end of the second switching unit, and the other end of the third resistor is connected to the second end of the control unit. This allows the third resistor to act as a current buffer in the power detection unit, thereby providing a certain degree of protection for the power detection unit.

[0074] In one embodiment, such as Figure 6 As shown, the power switching module also includes an internal power supply 110, and the enable pin of the ideal diode controller 104 is connected to the internal power supply 110 to use the internal power supply 110 as an enable signal.

[0075] Among them, internal power supply 110 can refer to internal 5V power supply.

[0076] In a specific implementation, the power switching module also includes an internal 5V power supply. The enable pin of the ideal diode controller can be connected to the internal 5V power supply to use the internal 5V power supply as an input to the ideal diode controller as an enable signal.

[0077] The technical solution of this embodiment, by setting an internal power supply in the power switching module and connecting the internal power supply to the enable pin of the ideal diode controller, can realize the control of the working state of the power switching module through the internal power supply.

[0078] In one embodiment, the power switching module further includes a transient voltage suppressor diode, one end of which is connected to an external power supply, and the other end of which is grounded.

[0079] Among them, transient voltage suppressor diodes can refer to transient surge suppressor (TVS) diodes, which are overvoltage protection devices with bidirectional voltage regulation and bidirectional negative resistance characteristics. They are mainly used to suppress instantaneous overvoltages and protect precision components in electronic circuits from damage by surge pulses.

[0080] Specifically, such as Figure 5As shown, the first power switching module also includes a transient voltage suppressor diode D1; one end of the transient voltage suppressor diode D1 is connected to the external power supply VIN1, and the other end of the transient voltage suppressor diode D1 is grounded to GND; the second power switching module also includes a transient voltage suppressor diode D2; one end of the transient voltage suppressor diode D2 is connected to the external power supply VIN2, and the other end of the transient voltage suppressor diode D2 is grounded to GND.

[0081] In its specific implementation, the power switching module also includes a transient voltage suppressor diode. One end of the transient voltage suppressor diode is connected to the external power supply, and the other end is grounded. When a surge voltage pulse occurs instantaneously in the power switching module, the transient voltage suppressor diode can quickly break down through Zener diode, changing from a high-resistance state to a low-resistance state, thereby shunting and clamping the surge voltage and precisely controlling the instantaneous overvoltage to a certain level, thus preventing excessively high voltage from damaging the subsequent circuits of the power switching module.

[0082] In one embodiment, the power switching module further includes a first capacitor, one end of which is connected to an external power source, and the other end of which is grounded.

[0083] In its implementation, the power switching module also includes a first capacitor, one end of which is connected to an external power source, and the other end is grounded. For more details, please refer to [link to relevant documentation]. Figure 5 The first capacitor can refer to Figure 5 The capacitor C1 of the first power switching module or the capacitor C4 of the second power switching module; one end of capacitor C1 is connected to the external power supply VIN1, and the other end of capacitor C1 is grounded to GND; one end of capacitor C4 is connected to the external power supply VIN2, and the other end of capacitor C4 is grounded to GND.

[0084] The technical solution of this embodiment, by setting a first capacitor in the power switching module, with one end of the first capacitor connected to an external power source and the other end grounded, can enable the first capacitor to play a voltage stabilizing role and provide a stable voltage for the subsequent circuits in the power switching module.

[0085] In one embodiment, the power switching module further includes a second capacitor, one end of which is connected to the anode pin of the ideal diode controller, and the other end of which is connected to the capacitor pin of the ideal diode controller.

[0086] In a specific implementation, the power switching module also includes a second capacitor. One end of the second capacitor is connected to the anode pin of the ideal diode controller, and the other end of the second capacitor is connected to the capacitor pin of the ideal diode controller. Specifically, as shown... Figure 5As shown, the second capacitor can refer to capacitor C2 of the first power switching module or capacitor C5 of the second power switching module; one end of capacitor C2 is connected to the anode pin of the ideal diode controller U1, and the other end of capacitor C2 is connected to the capacitor pin (Vcap pin) of the ideal diode controller U1; one end of capacitor C5 is connected to the anode pin of the ideal diode controller U2, and the other end of capacitor C5 is connected to the capacitor pin (Vcap pin) of the ideal diode controller U2.

[0087] The technical solution of this embodiment, by setting a second capacitor in the power switching module, with one end of the second capacitor connected to the anode pin of the ideal diode controller and the other end of the second capacitor connected to the capacitor pin of the ideal diode controller, can enable the second capacitor to play a voltage stabilizing role and protect the ideal diode controller in the power switching module.

[0088] In one embodiment, the power switching module further includes a third capacitor, one end of which is connected to the cathode pin of the ideal diode controller, and the other end of which is grounded.

[0089] like Figure 5 As shown, the third capacitor can be capacitor C3 of the first power switching module or capacitor C6 of the second power switching module; one end of capacitor C3 is connected to the cathode pin of the ideal diode controller U1, and the other end of capacitor C3 is grounded to GND; one end of capacitor C6 is connected to the cathode pin of the ideal diode controller U2, and the other end of capacitor C6 is grounded to GND.

[0090] In practice, one end of the third capacitor is connected to the cathode pin of the ideal diode controller and to the load, while the other end of the third capacitor is grounded. If the load has a certain current fluctuation or the voltage output by the ideal diode controller has a certain ripple component, the third capacitor can play a filtering role.

[0091] In addition, the third capacitor can store and release charge. It stores charge when the voltage rises and releases charge when the voltage drops, thereby smoothing the voltage waveform at the output of the power switching module, reducing voltage fluctuations and ripple, and making the output voltage of the power switching module more stable.

[0092] like Figure 7 As shown, one embodiment of a vehicle battery management system includes a power supply circuit. The vehicle battery management system further includes a BMS controller, and the power supply circuit is connected to the BMS controller, which serves as the load of the power supply circuit.

[0093] It should be noted that further limitations on the power supply circuit can be found in the limitations of one power supply circuit mentioned above, and will not be repeated here.

[0094] The aforementioned vehicle battery management system includes at least two power switching modules in its power supply circuit. Each power switching module is used to connect to a set of external power supplies, including a first switching unit and an ideal diode controller. The first terminal of the first switching unit is connected to the external power supply and to the anode pin of the ideal diode controller. The second terminal of the first switching unit is connected to the load and to the cathode pin of the ideal diode controller. The control terminal of the first switching unit is connected to the gate pin of the ideal diode controller. This parallel connection of the first switching unit and the ideal diode controller allows the ideal diode controller to effectively control the first switching unit to turn on or off based on an enable signal, achieving automatic switching between dual power supplies. This also results in a power supply circuit with small size, low voltage drop and heat dissipation, simple wiring, and reliable control, effectively improving the operational reliability of the vehicle battery management system.

[0095] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power supply circuit, characterized in that, include: At least two power switching modules, each power switching module is used to connect to a set of external power supplies, and each power switching module includes a first switching unit and an ideal diode controller; The first terminal of the first switching unit is connected to the external power supply and to the anode pin of the ideal diode controller; the second terminal of the first switching unit is connected to the load and to the cathode pin of the ideal diode controller; the control terminal of the first switching unit is connected to the gate pin of the ideal diode controller. The ideal diode controller is used to receive an enable signal to control the conduction or cutoff of the first switching unit.

2. The power supply circuit according to claim 1, characterized in that, The power switching module further includes: The control unit has a first terminal connected to the enable pin of the ideal diode controller; the control unit is used to output the enable signal.

3. The power supply circuit according to claim 2, characterized in that, The power switching module further includes: A power detection unit is provided, one end of which is connected to the external power source, and the other end of which is connected to the second end of the control unit. The control unit is used to collect voltage information of the external power source through the power detection unit.

4. The power supply circuit according to claim 3, characterized in that, The power detection unit includes a first resistor, a second resistor, and a second switch unit; The first terminal of the second switching unit is connected to the external power supply through the first resistor, the second terminal of the second switching unit is grounded through the second resistor, the control terminal of the second switching unit is connected to the first terminal of the control unit, and the second terminal of the second switching unit is connected to the second terminal of the control unit.

5. The power supply circuit according to claim 4, characterized in that, The power detection unit further includes: A third resistor, one end of which is connected to the second terminal of the second switching unit, and the other end of which is connected to the second terminal of the control unit.

6. The power supply circuit according to claim 1, characterized in that, The enable pin of the ideal diode controller is connected to the external power supply so that the external power supply is used as the enable signal.

7. The power supply circuit according to claim 1, characterized in that, The power switching module further includes: An internal power supply is provided, and the enable pin of the ideal diode controller is connected to the internal power supply to use the internal power supply as the enable signal.

8. The power supply circuit according to claim 1, characterized in that, The power switching module further includes: A transient voltage suppressor diode, one end of which is connected to the external power supply, and the other end of which is grounded.

9. The power supply circuit according to claim 1, characterized in that, The power switching module further includes: A first capacitor, one end of which is connected to the external power supply, and the other end of which is grounded.

10. The power supply circuit according to claim 1, characterized in that, The power switching module further includes: The second capacitor has one end connected to the anode pin of the ideal diode controller and the other end connected to the capacitor pin of the ideal diode controller.

11. The power supply circuit according to claim 1, characterized in that, The power switching module further includes: The third capacitor has one end connected to the cathode pin of the ideal diode controller and the other end grounded.

12. A vehicle battery management system, characterized in that, The power supply circuit includes any one of claims 1 to 11.

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