Power supply circuit, power supply device, and vehicle system

Abstract

The utility model discloses a power supply circuit, a power supply device and a vehicle system, a plurality of power supply lines comprising a power supply module and an anti-reverse module are detected through a control module, and when the input voltage of the power supply lines is greater than the output voltage of the whole power supply circuit, the anti-reverse module on the power supply lines is conducted, so that the power supply lines are used for supplying power to a load; multi-power-source competitive power supply is completed; it can be understood that anti-reverse modules on other power supply lines are turned off, and anti-reverse control of multi-power-source competitive power supply is completed; moreover, the switched-on anti-reverse module is controlled to maintain the constant voltage drop, so that the problem that the stability of the output voltage is influenced by the voltage drop change of the anti-reverse module caused by the change of the output current, and the negative influence on the function or performance of a post-stage circuit is caused is solved.

Description

Technical Field

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

[0002] Conventional power supply systems use a single power supply. When the power supply is abnormal, such as loose power harness, poor connector contact due to aging, or single power fuse blowing, the system function will be degraded or even fail. In this case, dual power supplies can be used for competitive power supply, and metal-oxide-semiconductor field-effect transistors (MOSFETs) are used on the output side of the two power supplies to prevent reverse.

[0003] However, the voltage drop of MOSFET will change as the current flowing through it increases or decreases, which will cause the output voltage to be unstable and affect the function or performance of the module in the subsequent circuit due to the change of input voltage. Utility Model Content

[0004] In view of the above problems, the present application provides a power supply circuit, a power supply device and a vehicle system, which can solve the problem that the anti-reverse design of the current power supply circuit may cause unstable output voltage.

[0005] A first aspect of an embodiment of the present application provides a power supply circuit, including multiple power supply modules, multiple anti-reverse modules and a control module;

[0006] Each of the anti-reverse modules is respectively connected between the output end of each of the power modules and the output end of the power supply circuit;

[0007] The control module is connected to the output end of each of the power modules, the output end of the power supply circuit and the control end of each of the anti-reverse modules, and is used to control the anti-reverse module connected to the target power module to be turned on and maintain the voltage drop of the anti-reverse module connected to the target power module constant when the voltage of the output end of the target power module is greater than the voltage of the output end of the power supply circuit;

[0008] Wherein, the target power module is any one of the multiple power modules.

[0009] In the technical solution of the embodiment of the present application, a plurality of power supply lines including a power supply module and an anti-reverse module are detected by a control module. When the input voltage of the power supply line is greater than the output voltage of the entire power supply circuit, the anti-reverse module on the power supply line is turned on to use the power supply line to power the load, thereby completing the competitive power supply of multiple power supplies; it can be understood that the anti-reverse modules on other power supply lines are also turned off to complete the anti-reverse control of the competitive power supply of multiple power supplies; and the turned-on anti-reverse module is also controlled to maintain its own voltage drop constant, so as to improve the voltage drop change of the anti-reverse module caused by the change of the output current, thereby affecting the stability of the output voltage and having a negative impact on the function or performance of the subsequent circuit.

[0010] In some embodiments, the control module includes a plurality of sub-control modules and a plurality of sub-energy storage modules;

[0011] The first detection end of each sub-control module is connected to the output end of each power module in a one-to-one correspondence, the second detection end of each sub-control module is connected to the output end of the power supply circuit, and the output end of each sub-control module is connected to the control end of each anti-reverse module in a one-to-one correspondence; the input end of each sub-energy storage module is connected to the output end of each power module in a one-to-one correspondence, and the output end of each sub-energy storage module is connected to the power supply end of each sub-control module;

[0012] Each of the sub-energy storage modules is used to store electrical energy based on the output of the connected power supply module and to supply power to the connected sub-control module; each of the sub-control modules is used to output a drive signal to drive the connected anti-reverse module to turn on and maintain a constant voltage drop of the connected anti-reverse module when the voltage at the output end of the connected power supply module is greater than the voltage at the output end of the power supply circuit.

[0013] In the technical solution of the embodiment of the present application, each of the multiple power supply lines including the power module and the anti-reverse module is powered by the corresponding sub-energy storage module and detected and controlled by the corresponding sub-control module. Each sub-control module only needs to detect the input side voltage and the output side voltage of the connected anti-reverse module. When the input side voltage is greater than the output side voltage, the anti-reverse module can be controlled to be turned on and the voltage drop of the anti-reverse module can be maintained constant. Otherwise, it will be turned off. This completes the competitive power supply of multiple power sources and their anti-reverse control, reduces the circuit cost, and is simple and reliable.

[0014] In some embodiments, the sub-control module includes:

[0015] A differential amplifier unit, the two input ends of which are respectively connected to the corresponding output end of the power module and the output end of the power supply circuit, and is used to output an initial driving signal according to the voltage difference between the output end of the power module and the output end of the power supply circuit;

[0016] A driving adjustment unit, one input end of which is connected to a reference voltage, the other input end of which is connected to the output end of the differential amplifier unit, and the output end of which is connected to the control end of the corresponding anti-reverse module. The driving adjustment unit is used to generate and adjust the driving signal according to the reference voltage and the initial driving signal to maintain a constant voltage drop of the connected anti-reverse module.

[0017] In the technical solution of the embodiment of the present application, a differential amplifier unit is used to generate and adjust the driving signal of the anti-reverse module to control the anti-reverse module, so as to adjust the on-resistance of the anti-reverse module to maintain the voltage drop of the anti-reverse module constant, thereby improving the voltage drop change of the anti-reverse module caused by the change of the output current, which affects the stability of the output voltage and has a negative impact on the function or performance of the subsequent circuit.

[0018] In some embodiments, the drive adjustment unit includes:

[0019] A comparator circuit, one input end of which is connected to a reference voltage and the other input end is connected to the differential amplifier unit. The comparator circuit is used to generate and adjust the drive signal according to the voltage difference between the reference voltage and the initial drive signal to maintain a constant voltage drop of the connected anti-reverse module.

[0020] In the technical solution of the embodiment of the present application, the reference voltage is compared with the initial drive signal through a comparator circuit. When the voltage difference between the initial drive signal and the reference voltage becomes larger, the drive signal is adjusted to become larger, so that the on-resistance of the anti-reverse module is reduced, and the voltage drop of the anti-reverse module is maintained constant; when the voltage difference between the initial drive signal and the reference voltage becomes smaller, the drive signal is adjusted to become smaller, so that the on-resistance of the anti-reverse module is increased, and the voltage drop of the anti-reverse module is maintained constant, thereby improving the stability of the output voltage caused by the change in the output current. The function or performance of the subsequent circuit has a negative impact.

[0021] In some embodiments, the sub-control module is disposed in an integrated circuit, which is beneficial to miniaturization of the product and reduction of material cost.

[0022] In some embodiments, the sub-energy storage module includes a first capacitor, and the first capacitor is connected between the output terminal of the corresponding power module and the power terminal of the sub-control module. An implementation of a sub-energy storage module is provided, which uses capacitors to store and release electrical energy, is simple, reliable, and low in cost.

[0023] In some embodiments, the anti-reverse module includes a metal oxide semiconductor field effect transistor, the metal oxide semiconductor field effect transistor is connected between the output end of each power module and the output end of the power supply circuit, and the gate of the metal oxide semiconductor field effect transistor constitutes the control end of the anti-reverse module;

[0024] The control module is used to output a driving signal to drive the metal oxide semi-conductor field effect transistor to be turned on, and to adjust the voltage of the driving signal so that the metal oxide semi-conductor field effect transistor works in a linear region to maintain a constant voltage drop.

[0025] In the technical solution of the embodiment of the present application, a metal oxide semiconductor field effect transistor is used to form an anti-reverse module. When the metal oxide semiconductor field effect transistor operates in a linear region, its on-resistance can be changed by changing its gate drive signal. In this way, its own voltage drop can be maintained constant, and the voltage drop change caused by the change of the output current can be improved, which affects the stability of the output voltage and has a negative impact on the function or performance of the subsequent circuit.

[0026] In some embodiments, the MOSFET includes an N-channel MOSFET, a source of the N-channel MOSFET is connected to the positive output electrode of the corresponding power module, a drain of the N-channel MOSFET is connected to the positive output electrode of the power supply circuit, and a gate of the N-channel MOSFET constitutes a control end of the anti-reverse module; or

[0027] The metal oxide semiconductor field effect transistor includes a P-channel metal oxide semiconductor field effect transistor, the drain of the P-channel metal oxide semiconductor field effect transistor is connected to the output positive electrode of the corresponding power module, the source of the P-channel metal oxide semiconductor field effect transistor is connected to the output positive electrode of the power supply circuit, and the gate of the P-channel metal oxide semiconductor field effect transistor constitutes the control end of the anti-reverse module.

[0028] In the technical solution of the embodiment of the present application, two implementation methods of using metal oxide semi-conductor field effect transistors as anti-reverse modules are provided.

[0029] A second aspect of an embodiment of the present application provides a power supply device, comprising a power supply circuit having a plurality of output terminals and the above-mentioned power supply circuit;

[0030] The multiple output ends of the power supply circuit are respectively connected to the input ends of the multiple power modules of the power supply circuit in a one-to-one correspondence.

[0031] In the technical solution of the embodiment of the present application, the power supply device can implement multi-power competition power supply and anti-reverse control for the subsequent circuit through the above-mentioned power supply circuit; and can also maintain a stable output voltage.

[0032] A third aspect of an embodiment of the present application provides a vehicle system, which includes the power supply circuit as described above; or, includes the power supply device as described above.

[0033] In the technical solution of the embodiment of the present application, the vehicle system uses the above-mentioned power supply circuit or power supply device to provide a stable power supply voltage to various electronic devices of the vehicle.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of a power supply circuit provided in some embodiments of the present application;

[0037] Figure 2 A schematic diagram of the structure of a power supply circuit provided in some embodiments of the present application;

[0038] Figure 3 A schematic diagram of the structure of a power supply circuit provided in some embodiments of the present application;

[0039] Figure 4 A schematic diagram of the structure of a power supply circuit provided in some embodiments of the present application;

[0040] Figure 5 A schematic diagram of the structure of a power supply circuit provided in some embodiments of the present application;

[0041] Figure 6 A circuit diagram of a power supply circuit provided for some embodiments of the present application. DETAILED DESCRIPTION

[0042] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The phrase "second connection port" at various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] In the description of the embodiments of the present application, the term "multi-frame" refers to more than two (including two).

[0048] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0049] In vehicle systems, in order to ensure that important electronic equipment related to driving safety (such as brake devices, on-board computers, etc.) can operate normally under various conditions, it is often necessary to design redundant power supplies, for example, using multiple power supplies or gate competitive power supply methods to power these important electronic equipment.

[0050] The current redundant power supply has multiple power supplies competing for power supply. If MOSFET is used for reverse protection, the voltage drop of MOSFET will change with the increase or decrease of the current flowing through it, which will cause the output voltage to be unstable and the subsequent circuit will be affected by the change of input voltage on the function or performance of the module.

[0051] In order to solve the above technical problems, the embodiments of the present application provide a power supply circuit that can maintain a stable output voltage and prevent reverse connection of multiple power supplies competing for power supply. Figure 1 , Figure 1 Schematic diagram of the structure of the power supply circuit 100 provided in some embodiments of the present application. Figure 1 As shown, the power supply circuit 100 includes a plurality of power supply modules 110 , a plurality of anti-reverse modules 120 and a control module 130 .

[0052] Each anti-reverse module 120 is respectively connected between the output end of each power module 110 and the output end of the power supply circuit 100, and the output end of the power supply circuit 100 is used to connect the load 200;

[0053] The control module 130 is connected to the output end of each power module 110, the output end of the power supply circuit 100 and the control end of each anti-reverse module 120, and is used to control the anti-reverse module 120 connected to the target power module 110 to be turned on and maintain the voltage drop of the anti-reverse module 120 connected to the target power module 110 constant when the voltage at the output end of the target power module 110 is greater than the voltage at the output end of the power supply circuit 100; wherein the target power module 110 is any one of the multiple power modules 110.

[0054] The power module 110 may be a storage power source, a power interface or a power circuit. The anti-reverse module 120 is mainly used to control the on / off of the power supply line, and is turned on when the output voltage is required, and is turned off when the output voltage is not required, so as to prevent the current at the output end of the power supply circuit 100 from flowing back to the power module 110 of the power supply line, causing adverse effects.

[0055] In this embodiment, the control module 130 detects the voltage at the output end of each power module 110 and the voltage at the output end of the power supply circuit 100. If the voltage at the output end of the target power module 110 is greater than the voltage at the output end of the power supply circuit 100, it means that the voltage provided by the power module 110 of the power supply line is higher than the voltage provided by its power supply line, and the anti-reverse module 120 is controlled to be turned on to implement competitive power supply and output a higher voltage to the output end of the power supply circuit 100. At the same time, it can be understood that after an anti-reverse module 120 is controlled to be turned on, other anti-reverse modules 120 should be controlled to be turned off to prevent the output end circuit of the power supply circuit 100 from backflowing to other power modules 110, causing adverse effects.

[0056] In addition, in order to maintain the voltage stability provided to the subsequent circuit, the anti-reverse module 120 that has been turned on should maintain the stability of its own voltage drop, thereby reducing the negative impact on the function or performance of the subsequent circuit. Exemplarily, the voltage drop of the anti-reverse module 120 itself can be maintained by changing the driving current, driving signal, on-resistance, etc. of the anti-reverse module 120 that has been turned on.

[0057] In the technical solution of the embodiment of the present application, when the control module 130 detects that the input voltage of the power supply line is greater than the output voltage of the entire power supply circuit 100, the anti-reverse module 120 on the power supply line is turned on to use the power supply line to power the load 200, thereby completing the competition for power supply by multiple power sources; and, the turned-on anti-reverse module 120 is also controlled to maintain its own voltage drop constant, so as to improve the voltage drop change of the anti-reverse module 120 caused by the change of the output current, which affects the stability of the output side voltage and has a negative impact on the function or performance of the subsequent circuit.

[0058] Please refer to Figure 2 , Figure 2 Schematic diagram of the structure of the power supply circuit 100 provided in some embodiments of the present application. Figure 2 As shown, in some embodiments, the control module 130 includes a plurality of sub-control modules 131 and a plurality of sub-energy storage modules 132 .

[0059] The first detection end of each sub-control module 131 is connected to the output end of each power module 110 in a one-to-one correspondence, the second detection end of each sub-control module 131 is connected to the output end of the power supply circuit 100, and the output end of each sub-control module 131 is connected to the control end of each anti-reverse module 120 in a one-to-one correspondence; the input end of each sub-energy storage module 132 is connected to the output end of each power module 110 in a one-to-one correspondence, and the output end of each sub-energy storage module 132 is connected to the power supply end of each sub-control module 131.

[0060] Each sub-energy storage module 132 is used to store electrical energy based on the output of the connected power module 110 and to supply power to the connected sub-control module 131; each sub-control module 131 is used to output a drive signal to drive the connected anti-reverse module 120 to turn on when the voltage at the output end of the connected power module 110 is greater than the voltage at the output end of the power supply circuit 100, and to maintain a constant voltage drop of the connected anti-reverse module 120.

[0061] Among them, each sub-control module 131 detects the voltage of the output end of the connected power module 110 and the voltage of the output end of the power supply circuit 100 respectively. If the voltage of the output end of the connected power module 110 is greater than the voltage of the output end of the power supply circuit 100, the anti-reverse module 120 is controlled to be turned on, otherwise it is turned off, completing the multi-power supply competition and anti-reverse control. In addition, the self-voltage drop of the anti-reverse module 120 can be maintained constant by changing the driving current, driving signal, on-resistance, etc. of the connected anti-reverse module 120, so as to improve the voltage drop change of the anti-reverse module 120 caused by the change of the output current, which affects the stability of the output side voltage and has a negative impact on the function or performance of the subsequent circuit.

[0062] In addition, each sub-control module 131 is powered by a separate sub-energy storage module 132 based on the electric energy provided by the power module 110, without the need for external power supply, and the power supply method is simple and reliable.

[0063] Please refer to Figure 3 , Figure 3 Schematic diagram of the structure of the power supply circuit 100 provided in some embodiments of the present application. Figure 3 As shown, in some embodiments, the sub-control module 131 includes a differential amplification unit 1311 and a drive adjustment unit 1312 .

[0064] The two input ends of the differential amplifier unit 1311 are respectively connected to the output end of the corresponding power module 110 and the output end of the power supply circuit 100, and are used to output an initial driving signal according to the voltage difference between the output end of the power module 110 and the output end of the power supply circuit 100. One input end of the driving adjustment unit 1312 is connected to the reference voltage Vref, the other input end of the driving adjustment unit 1312 is connected to the output end of the differential amplifier unit 1311, and the output end of the driving adjustment unit 1312 is connected to the control end of the corresponding anti-reverse module 120. The driving adjustment unit 1312 is used to generate and adjust the driving signal according to the reference voltage Vref and the initial driving signal to maintain a constant voltage drop of the connected anti-reverse module 120.

[0065] Among them, the voltage difference between the voltage at the output end of the power supply module 110 and the voltage at the output end of the power supply circuit 100, that is, the voltage difference between the input side voltage and the output side voltage of the anti-reverse module 120, the differential amplifier unit 1311 samples and amplifies the voltage difference to obtain an initial drive signal input to the drive adjustment unit 1312; the drive adjustment unit 1312 compares the initial drive signal with the set reference voltage Vref, thereby outputting a drive signal, and adjusting the size of the drive signal at the control end of the anti-reverse module 120 based on the change in the voltage difference between the input side voltage and the output side voltage of the connected anti-reverse module 120, thereby adjusting the on-resistance of the anti-reverse module 120, so that the voltage drop of the anti-reverse module 120 is constant. Improve the stability of the output voltage affected by the change in the voltage drop of the anti-reverse module 120 caused by the change in the output current, and have a negative impact on the function or performance of the subsequent circuit.

[0066] In some embodiments, the drive adjustment unit 1312 includes a comparator circuit, one input end of the comparator circuit is connected to a reference voltage Vref, and the other input end of the comparator circuit is connected to the differential amplifier unit 1311. The comparator circuit is used to generate and adjust the drive signal according to the difference between the reference voltage Vref and the initial drive signal to maintain a constant voltage drop of the connected anti-reverse module 120.

[0067] For example, the comparator circuit compares the reference voltage Vref with the voltage value of the initial drive signal. When the voltage value of the initial drive signal increases, that is, the voltage difference between it and the reference voltage Vref becomes larger, the voltage / current of the drive signal is adjusted to increase, so that the on-resistance of the connected anti-reverse module 120 is reduced, and the voltage drop of the anti-reverse module 120 is maintained constant; when the voltage value of the initial drive signal decreases, that is, the difference between it and the reference voltage Vref becomes smaller, the drive signal is adjusted to decrease, so that the on-resistance of the connected anti-reverse module 120 is increased, and the voltage drop of the anti-reverse module 120 is maintained constant, thereby improving the stability of the output voltage caused by the change in the voltage drop of the anti-reverse module 120 due to the change in the output current, which has a negative impact on the function or performance of the subsequent circuit.

[0068] In some embodiments, the sub-control module 131 is disposed in an integrated circuit, which is beneficial to miniaturization of the product and reduction of material cost.

[0069] Please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of a power supply circuit 100 provided in some embodiments of the present application. Figure 5 Schematic diagram of the structure of the power supply circuit 100 provided in some embodiments of the present application. Figure 4 and Figure 5 As shown, in some embodiments, the sub-energy storage module 132 includes a first capacitor C1, and the first capacitor C1 is connected between the output terminal of the corresponding power module 110 and the power terminal of the sub-control module 131. An implementation of the sub-energy storage module 132 is provided, which uses capacitors to store and release electrical energy, is simple, reliable, and low in cost.

[0070] It is understandable that the first capacitor C1 may also be connected between the output end of the power supply circuit 100 and the power supply end of the sub-control module 131 to obtain power from the output end of the power supply circuit 100 .

[0071] Please refer to Figure 4 and Figure 5 In some embodiments, the anti-reverse module 120 includes a metal oxide semiconductor field effect transistor Q1, which is connected between the output end of the corresponding power module 110 and the output end of the power supply circuit 100, and the gate of the metal oxide semiconductor field effect transistor Q1 constitutes the control end of the anti-reverse module 120;

[0072] The control module 130 is used to output a driving signal to drive the MOSFET Q1 to be turned on, and to adjust the voltage amplitude of the driving signal so that the MOSFET Q1 works in a linear region to maintain a constant voltage drop.

[0073] The control module 130 or the corresponding sub-control module 131 detects the input side voltage and the output side voltage of the MOSFET Q1. Exemplarily, the MOSFET Q1 includes an N-channel MOSFET. The control module 130 or the corresponding sub-control module 131 detects the output current Id (see Figure 3 ) increases, the voltage of the output drive signal is adjusted to increase, that is, the voltage amplitude is increased, so that the on-resistance of the N-channel MOSFET is reduced, and the voltage drop itself is maintained constant. Exemplarily, the MOSFET Q1 includes a P-channel MOSFET. When the control module 130 or the corresponding sub-control module 131 detects that the output current Id flowing through the P-channel MOSFET increases, the voltage of the output drive signal is adjusted to decrease, that is, the voltage amplitude is increased, so that the on-resistance of the P-channel MOSFET is reduced, and the voltage drop itself is maintained constant.

[0074] In the technical solution of the embodiment of the present application, a metal oxide semiconductor field effect transistor Q1 is used to form an anti-reverse module 120. When the metal oxide semiconductor field effect transistor Q1 operates in the linear region, its on-resistance can be changed by changing its gate drive signal. In this way, it is possible to maintain its own voltage drop constant, improve the voltage drop change caused by the change of the output current, and affect the stability of the output voltage, thereby having a negative impact on the function or performance of the subsequent circuit.

[0075] Please refer to Figure 4 In some embodiments, the MOSFET Q1 includes an N-channel MOSFET, a source of which is connected to the positive output electrode of the corresponding power module 110, a drain of which is connected to the positive output electrode Vo+ of the power supply circuit 100, and a gate of which constitutes the control end of the anti-reverse module 120.

[0076] Please refer to Figure 5 In some embodiments, the MOSFET Q1 includes a P-channel MOSFET, the drain of the P-channel MOSFET is connected to the positive output electrode of the corresponding power module 110, the source of the P-channel MOSFET is connected to the positive output electrode Vo+ of the power supply circuit 100, and the gate of the P-channel MOSFET constitutes the control end of the anti-reverse module 120.

[0077] The technical solution of the embodiment of the present application provides two implementation methods of using the metal oxide semi-conductor field effect transistor Q1 as the anti-reverse module 120. In the two real-time methods, the conduction direction of the body diode of the metal oxide semi-conductor field effect transistor Q1 is related to the output current Id of the metal oxide semi-conductor field effect transistor Q1 when it is turned on (see Figure 3) The transmission direction is the same, in order to prevent the current at the output end of the power supply circuit 100 from flowing into the power module 110 through the body diode of the MOSFET Q1 during the cut-off stage, thereby causing a bad influence on the power module 110.

[0078] Please refer to Figure 6 , Figure 6 Schematic diagram of a power supply circuit 100 provided in some embodiments of the present application. Figure 6 As shown, in some embodiments, the differential amplifier unit 1311 includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1 and an operational amplifier U1, the non-inverting input terminal of the operational amplifier U1 is connected to the positive output terminal of the power module 110 through the resistor R1, the non-inverting input terminal of the operational amplifier U1 is also grounded through the resistor R3, the inverting input terminal of the operational amplifier U1 is connected to the positive output terminal Vo+ of the power supply circuit through the resistor R2, the inverting input terminal of the operational amplifier U1 is also connected to the output terminal through the resistor R4, and the capacitor C1 is connected in parallel with the resistor R.

[0079] The comparator circuit (i.e., the drive adjustment unit 1312) includes resistors R5, R6, R7, R8, capacitors C2, C3 and comparator U2. The non-inverting input of the comparator circuit is connected to the output of the operational amplifier U1 through resistor R5, the inverting input of the comparator U2 is connected to the reference voltage Vref through resistor R6, capacitor C2 is connected between the inverting input and output of the comparator U2, resistor R7 is connected in series with capacitor C3 and then connected in parallel with capacitor C2, and the output of the comparator U2 is connected to the control end of the anti-reverse module 120, i.e., the gate of the metal oxide semi-field effect transistor Q1, through resistor R8.

[0080] Take the MOSFET Q1 including an N-channel MOSFET as an example. The differential amplifier unit 1311 samples and amplifies the voltage difference between the drain and source of the MOSFET Q1, and outputs an initial drive signal to the comparator circuit; the comparator circuit compares the two input voltages, and generates an output voltage (i.e., a drive signal) according to the voltage difference, thereby controlling the output voltage of the comparator U2. By adjusting the gate voltage of the MOSFET Q1, the on-resistance value of the MOSFET Q1 is changed, and the MOSFET Q1 is ensured to work in the linear region, so that the voltage difference between the drain and source of the MOSFET Q1 is kept at a certain value, and the gate voltage is maintained higher than the drain voltage.

[0081] For example, when the output current Id increases, the voltage difference between the drain and source of the MOSFET Q1 increases, the voltage amplitude of the drive signal output by the comparator U2 increases after adjustment by the comparator circuit, the gate voltage of the MOSFET Q1 increases, the on-resistance of the MOSFET Q1 decreases, and the voltage difference between the drain and source decreases, thereby ensuring that the voltage drop on the isolated MOSFET Q1 is constant. When the output current Id decreases, the voltage difference between the drain and source of the MOSFET Q1 decreases, the voltage amplitude of the drive signal output by the comparator U2 also decreases after adjustment by the comparator circuit, the gate voltage of the MOSFET Q1 decreases, the on-resistance increases, and the voltage difference between the drain and source increases, thereby ensuring that the voltage drop on the MOSFET Q1 is constant.

[0082] The working principles of the embodiments in which the MOSFET Q1 includes a P-channel MOSFET and an N-channel MOSFET are similar, and are not described in detail here.

[0083] A second aspect of the embodiment of the present application provides a power supply device, a power supply circuit having multiple output terminals and the above-mentioned power supply circuit 100;

[0084] The multiple output terminals of the power supply circuit are respectively connected to the input terminals of the multiple power modules 110 of the power supply circuit 100 in a one-to-one correspondence.

[0085] In the technical solution of the embodiment of the present application, the power supply device can implement multi-power competition power supply and anti-reverse control for the subsequent circuit through the above-mentioned power supply circuit 100; and can also maintain a stable output voltage.

[0086] A third aspect of an embodiment of the present application provides a vehicle system, the vehicle system includes the power supply circuit 100 as described above; or includes the power supply device as described above.

[0087] In the technical solution of the embodiment of the present application, the vehicle system uses the above-mentioned power supply circuit 100 or power supply device to provide a stable power supply voltage to various electronic devices of the vehicle.

[0088] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0089] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0091] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0093] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: It includes multiple power modules, multiple anti-reverse modules and control modules; Each of the anti-reverse modules is respectively connected between the output end of each of the power modules and the output end of the power supply circuit; The control module is connected to the output end of each of the power modules, the output end of the power supply circuit and the control end of each of the anti-reverse modules, and is used to control the anti-reverse module connected to the target power module to be turned on and maintain a constant voltage drop of the anti-reverse module connected to the target power module when the voltage of the output end of the target power module is greater than the voltage of the output end of the power supply circuit; Wherein, the target power module is any one of the multiple power modules.

2. The power supply circuit according to claim 1, characterized in that: The control module includes a plurality of sub-control modules and a plurality of sub-energy storage modules; The first detection end of each sub-control module is connected to the output end of each power module in a one-to-one correspondence, the second detection end of each sub-control module is connected to the output end of the power supply circuit, and the output end of each sub-control module is connected to the control end of each anti-reverse module in a one-to-one correspondence; the input end of each sub-energy storage module is connected to the output end of each power module in a one-to-one correspondence, and the output end of each sub-energy storage module is connected to the power supply end of each sub-control module; Each of the sub-energy storage modules is used to store electrical energy based on the output of the connected power supply module and to supply power to the connected sub-control module; Each of the sub-control modules is used to output a drive signal to drive the connected anti-reverse module to turn on and maintain a constant voltage drop of the connected anti-reverse module when the voltage at the output end of the connected power supply module is greater than the voltage at the output end of the power supply circuit.

3. The power supply circuit according to claim 2, characterized in that: The sub-control module includes: A differential amplifier unit, the two input ends of which are respectively connected to the corresponding output end of the power module and the output end of the power supply circuit, and is used to output an initial driving signal according to the voltage difference between the output end of the power module and the output end of the power supply circuit; A driving adjustment unit, one input end of which is connected to a reference voltage, the other input end of which is connected to the output end of the differential amplifier unit, and the output end of which is connected to the control end of the corresponding anti-reverse module. The driving adjustment unit is used to generate and adjust the driving signal according to the reference voltage and the initial driving signal to maintain a constant voltage drop of the connected anti-reverse module.

4. The power supply circuit according to claim 3, characterized in that: The driving adjustment unit comprises: A comparator circuit, one input end of which is connected to a reference voltage and the other input end is connected to the differential amplifier unit. The comparator circuit is used to generate and adjust the drive signal according to the voltage difference between the reference voltage and the initial drive signal to maintain a constant voltage drop of the connected anti-reverse module.

5. The power supply circuit according to claim 3, characterized in that: The sub-control module is arranged in an integrated circuit.

6. The power supply circuit according to claim 2, characterized in that: The sub-energy storage module includes a first capacitor, which is connected between the output end of the corresponding power module and the power end of the sub-control module.

7. The power supply circuit according to any one of claims 1 to 6, characterized in that: The anti-reverse module includes a metal oxide semiconductor field effect transistor, which is connected between the output end of each power module and the output end of the power supply circuit, and the gate of the metal oxide semiconductor field effect transistor constitutes the control end of the anti-reverse module; The control module is used to output a driving signal to drive the metal oxide semi-conductor field effect transistor to be turned on, and to adjust the voltage amplitude of the driving signal so that the metal oxide semi-conductor field effect transistor works in a linear region to maintain a constant voltage drop.

8. The power supply circuit according to claim 7, characterized in that: The MOSFET includes an N-channel MOSFET, the source of which is connected to the positive output electrode of the corresponding power module, the drain of which is connected to the positive output electrode of the power supply circuit, and the gate of which constitutes the control end of the anti-reverse module; or The metal oxide semiconductor field effect transistor includes a P-channel metal oxide semiconductor field effect transistor, the drain of the P-channel metal oxide semiconductor field effect transistor is connected to the output positive electrode of the corresponding power module, the source of the P-channel metal oxide semiconductor field effect transistor is connected to the output positive electrode of the power supply circuit, and the gate of the P-channel metal oxide semiconductor field effect transistor constitutes the control end of the anti-reverse module.

9. A power supply device, characterized in that: A power supply circuit comprising a plurality of output terminals and a power supply circuit as claimed in any one of claims 1 to 8; The multiple output ends of the power supply circuit are respectively connected to the input ends of the multiple power modules of the power supply circuit in a one-to-one correspondence.

10. A vehicle system, characterized in that: The vehicle system comprises the power supply circuit according to any one of claims 1 to 8; or, comprises the power supply device according to claim 9.

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