Power supply circuit and electric equipment

Abstract

The utility model provides a power supply circuit and electric equipment. The power supply circuit comprises a first power supply, a first switch module, a second power supply and a second switch module. The first switch module is electrically connected between the first power supply and the load circuit. The second switch module is electrically connected between the second power supply and the load circuit. The load circuit is used for controlling on and off of the second switch module. When the first switch module conducts the electric connection between the first power supply and the load circuit, and the second switch module conducts the electric connection between the second power supply and the load circuit when the load circuit is powered on, so that the first power supply and the second power supply can supply power to the load circuit at the same time. The power supply circuit can provide redundant dual power supply for the load circuit, and when the first power supply breaks down, the second power supply can continuously supply power, so that the power failure risk of the load circuit during power supply switching can be avoided, and the power supply reliability can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a power supply circuit and an electrical device. Background Art

[0002] At present, with the development of technology, there are more and more electronic devices on electric power-consuming equipment, and the requirements for power supply reliability are getting higher and higher. In the existing redundant power supply design scheme, the main power supply is usually used for power supply, and the backup power supply is on standby. When the main power supply fails, it switches to the backup power supply for power supply. However, there is a certain response time when the system switches the power supply. The switching delay caused by the response time is very dangerous for the electric equipment in motion. In addition, if there is a fault during switching, such as communication failure, contactor sintering, etc., the power supply switching failure will result in power failure, and the power supply reliability cannot be guaranteed. Utility Model Content

[0003] In order to solve the above technical problem or at least partially solve the above technical problem, the utility model provides a power supply circuit and an electrical device.

[0004] To achieve the above object, the first aspect of the present invention provides a power supply circuit, the power supply circuit comprising:

[0005] First power source;

[0006] A first switch module, electrically connected between the first power supply and a load circuit;

[0007] a second power source; and

[0008] A second switch module, electrically connected between the second power supply and the load circuit;

[0009] The load circuit is used to control the on and off of the second switch module;

[0010] Among them, when the first switch module conducts the electrical connection between the first power supply and the load circuit, the second switch module conducts the electrical connection between the second power supply and the load circuit when the load circuit is powered on, so that the first power supply and the second power supply can supply power to the load circuit at the same time.

[0011] The power supply circuit provided by the utility model controls the second switch module to be turned on after the load circuit receives the power of the first power supply through the first switch module, so that the first power supply and the second power supply can simultaneously power the load circuit. In this way, redundant dual power supply can be provided for the load circuit. When the first power supply fails, the second power supply can continue to supply power, thereby avoiding the risk of power failure of the load circuit when the power supply is switched, and improving the reliability of power supply.

[0012] In some embodiments, the power supply circuit further includes a first controller, the first controller is electrically connected to the first switch module, and the first controller controls the first switch module to conduct in response to a start-up instruction.

[0013] In some embodiments, the load circuit includes a second controller, the second controller is electrically connected to the second switch module, and the second controller is used to control the second switch module to be turned on when powered on.

[0014] In some embodiments, the power supply circuit also includes a first anti-reverse module, the first anti-reverse module and the first switch module are connected in series between the first power supply and the load circuit, and the first anti-reverse module is used to achieve unidirectional conduction from the first power supply to the load circuit.

[0015] In some embodiments, the power supply circuit also includes a detection module, which is electrically connected between the first anti-reverse module and the first power supply, and is used to detect the voltage of the first power supply, and determine whether the first power supply can supply power normally based on the voltage of the first power supply, and when it is determined that the first power supply cannot supply power normally, output a fault signal to the first controller so that the first controller records the fault.

[0016] In some embodiments, the power supply circuit also includes a power conversion module electrically connected between the second power supply and the second switch module, the power conversion module includes a first end and a second end, the first end is electrically connected to the second power supply, the second end is electrically connected to the second switch module, and the power conversion module is used to receive a first voltage provided by the second power supply through the first end, convert the first voltage into a second voltage, and output the second voltage through the second end.

[0017] In some embodiments, the power supply circuit also includes a second anti-reverse module, and the second anti-reverse module and the second switch module are connected in series between the second end of the power conversion module and the load circuit, and the second anti-reverse module is used to realize unidirectional conduction from the second end of the power conversion module to the load circuit.

[0018] In some embodiments, the power supply circuit also includes a first overcurrent protection module, which is connected in series with the first switch module between the first power supply and the load circuit, and the first overcurrent protection module is used to disconnect the electrical connection between the first power supply and the load circuit when the current output by the first power supply to the load circuit is greater than a first current threshold.

[0019] In some embodiments, the power supply circuit also includes a second overcurrent protection module, which is connected in series with the second overcurrent protection module and the second switch module between the second end of the power conversion module and the load circuit, and the second overcurrent protection module is used to disconnect the electrical connection between the second end of the power conversion module and the load circuit when the current output by the power conversion module to the load circuit is greater than a second current threshold.

[0020] In some embodiments, the power supply circuit also includes a third switch module, which is electrically connected between the second end of the power conversion module and the first power supply, and the third switch module is used to conduct the electrical connection between the second end of the power conversion module and the first power supply, so that the power conversion module can charge the first power supply through the third switch module.

[0021] In some embodiments, the first controller further controls the first switch module to be disconnected in response to a power-off instruction.

[0022] In some embodiments, the second controller further controls the second switch module to be disconnected in response to a power-off instruction.

[0023] In some embodiments, the second power source includes a power battery.

[0024] The second aspect of the present invention further provides an electrical device, wherein the electrical device comprises the power supply circuit described in the first aspect.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a power supply circuit provided in an embodiment of the utility model.

[0027] The following are the descriptions of the reference numerals:

[0028] Electrical equipment 1

[0029] Power supply circuit 100

[0030] Second power supply 200

[0031] The first power source 10

[0032] The first switch module S1

[0033] Load circuit 20

[0034] Second controller 21

[0035] Power conversion module 30

[0036] The second switch module S2

[0037] First controller 40

[0038] The first anti-reverse module 50

[0039] Detection module 60

[0040] The second anti-reverse module 80

[0041] The first overcurrent protection module 70

[0042] The second overcurrent protection module 90

[0043] Integrated controller 110

[0044] The third switch module S3

[0045] The following specific implementation manner will illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] In addition, the terms "first", "second", etc. in the specification of the utility model are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0049] See also Figure 1 , Figure 1The utility model provides a power circuit 100, which includes a first power supply 10, a first switch module S1, a second power supply 200 and a second switch module S2.

[0050] The first switch module S1 is electrically connected between the first power source 10 and the load circuit 20 .

[0051] The second switch module S2 is electrically connected between the second power source 200 and the load circuit 20 .

[0052] The load circuit 20 is used to control the on and off of the second switch module S2.

[0053] Among them, when the first switch module S1 conducts the electrical connection between the first power supply 10 and the load circuit 20, the second switch module S2 conducts the electrical connection between the second end of the power conversion module 30 and the load circuit 20 when the load circuit 20 is powered on, so that the first power supply 10 and the second power supply 200 can supply power to the load circuit 20 at the same time.

[0054] The power supply circuit 100 provided by the utility model controls the second switch module S2 to be turned on after the load circuit 20 receives the power from the first power supply 10 via the first switch module S1, so that the first power supply 10 and the second power supply 200 simultaneously power the load circuit 20. In this way, redundant dual power supply can be provided for the load circuit 20. When the first power supply 10 fails, since the second power supply 200 can continue to supply power, the risk of power failure of the load circuit 20 during power switching can be avoided, and the reliability of power supply can be improved.

[0055] Exemplarily, the first power source 10 includes but is not limited to a battery, a supercapacitor, etc. In this way, the power supply circuit 100 does not need to be provided with two batteries for power supply. On the one hand, there is no need to add wiring, insurance and contactors, so that the cost will not be increased; on the other hand, there is no need to set up multiple relays and two-way data sampling, and the control logic is simpler, so that sintering, network communication faults and other faults are not likely to occur, and the control is simple, stable and efficient.

[0056] Exemplarily, the second power source 200 includes a power battery, a super capacitor, and the like.

[0057] In some embodiments, the power supply circuit 100 also includes a power conversion module 30 electrically connected between the second power supply 200 and the second switch module S2, the power conversion module 30 includes a first end and a second end, the first end is electrically connected to the second power supply 200, the second end is electrically connected to the second switch module S2, the power conversion module 30 is used to receive a first voltage provided by the second power supply 200 through the first end, convert the first voltage into a second voltage, and output the second voltage through the second end.

[0058] In some embodiments, the power conversion module 30 is a DC / DC power conversion module. For example, the DC / DC power conversion module may include a buck chopper circuit. The first end of the power conversion module 30 is the input end of the DC / DC power conversion module, which is used to receive the first voltage provided by the second power supply 200 in the vehicle. The second end of the power conversion module 30 is the output end of the DC / DC power conversion module, which is electrically connected to the load circuit 20 through the second switch module S2. In other embodiments, the power conversion module 30 may also be an AC / DC power conversion module, or a buck-boost chopper circuit, a boost chopper circuit, etc., which are not limited here.

[0059] In some embodiments, the power supply circuit 100 further includes a first controller 40 , wherein the first controller 40 is electrically connected to the first switch module S1 , and the first controller 40 controls the first switch module S1 to be turned on in response to a start-up instruction.

[0060] In some embodiments, the load circuit 20 includes a second controller 21 , the second controller 21 is electrically connected to the second switch module S2 , and the second controller 21 is used to control the second switch module S2 to be turned on when powered on.

[0061] Exemplarily, the first controller 40 may be a vehicle controller unit (VCU) for controlling the vehicle. The first controller 40 and the second controller 21 may adopt one or more of various types of controllers such as FPGA (Field Programmable Gate Array), MCU (Micro Control Unit), DSP (Digital Signal Process), ARM (Advanced RISC Machines, modern computer processor chip) and single-chip microcomputer (Low Performance MCU), which are not listed one by one in the embodiments of the utility model.

[0062] In some embodiments, the power supply circuit 100 also includes a first anti-reverse module 50, and the first anti-reverse module 50 and the first switch module S1 are connected in series between the first power supply 10 and the load circuit 20, and the first anti-reverse module 50 is used to realize unidirectional conduction from the first power supply 10 to the load circuit 20.

[0063] In this way, the first anti-reverse module 50 can prevent the power conversion module 30 from reversely transmitting power to the first power source 10 through the second switch module S2 and the first switch module S1 in sequence, thereby improving the safety of the circuit.

[0064] In some embodiments, the power supply circuit 100 also includes a detection module 60, which is electrically connected between the first anti-reverse module 50 and the first power supply 10. The detection module 60 is used to detect the voltage of the first power supply 10, and determine whether the first power supply 10 can supply power normally based on the voltage of the first power supply 10, and when it is determined that the first power supply 10 cannot supply power normally, output a fault signal to the first controller 40 so that the first controller 40 records the fault.

[0065] The power supply circuit 100 can be applied to a vehicle. During operation, when a user starts the vehicle, the first controller 40 receives the start instruction and controls the first switch module S1 to be turned on, so that the load circuit 20 can receive the voltage provided by the first power supply 10 through the turned-on first switch module S1. At this time, if the first power supply 10 cannot supply power normally, the second controller 21 cannot be powered on, so that the second switch module S2 remains in a disconnected state. At the same time, the detection module 60 detects that the connection point between the first anti-reverse module 50 and the first power supply 10 is at a low level, and determines that the first power supply 10 cannot supply power normally, thereby outputting the fault signal to the first controller 40. The first controller 40 controls the dashboard in the vehicle to display a fault mark in response to the fault signal to remind the user that there is a fault in the first power supply 10; if the first power supply 10 can supply power normally, the second controller 21 in the load circuit 20 is successfully powered on and controls the second switch module S2 to turn on. In this way, the first power supply 10 and the power conversion module 30 simultaneously power the load circuit 20. At the same time, the detection module 60 detects that the connection point between the first anti-reverse module 50 and the first power supply 10 is at a high level.

[0066] After the vehicle is successfully started, if the first power supply 10 is powered off due to a fault, the detection module 60 detects that the connection point between the first anti-reverse module 50 and the first power supply 10 is at a low level, and determines that the first power supply 10 cannot supply power normally, thereby outputting the fault signal to the first controller 40. The first controller 40 controls the instrument panel to display a fault mark in response to the fault signal to remind the user that there is a fault in the first power supply 10. At this time, although the first power supply 10 is powered off, the power conversion module 30 can continue to supply power to the load circuit 20 through the second switch module S2. In this way, the load circuit 20 has no risk of power failure when the first power supply 10 fails, and is safer.

[0067] In some embodiments, the power supply circuit 100 also includes a second anti-reverse module 80, and the second anti-reverse module 80 and the second switch module S2 are connected in series between the second end of the power conversion module 30 and the load circuit 20, and the second anti-reverse module 80 is used to realize unidirectional conduction from the second end of the power conversion module 30 to the load circuit 20.

[0068] In this way, the second anti-reverse module 80 can prevent the first power source 10 from reversely transmitting power to the power conversion module 30 through the first switch module S1 and the second switch module S2 in sequence, thereby improving the safety of the circuit.

[0069] In some embodiments, the power supply circuit 100 also includes a first overcurrent protection module 70, which is connected in series with the first switch module S1 between the first power supply 10 and the load circuit 20, and the first overcurrent protection module 70 is used to disconnect the electrical connection between the first power supply 10 and the load circuit 20 when the current output by the first power supply 10 to the load circuit 20 is greater than a first current threshold.

[0070] In this way, when a short circuit fault occurs in the power supply circuit of the first power supply 10 , the first overcurrent protection module 70 can cut off the electrical connection between the first power supply 10 and the load circuit 20 , thereby improving the safety of the power supply circuit 100 .

[0071] In some embodiments, the power supply circuit 100 also includes a second overcurrent protection module 90, which is connected in series with the second overcurrent protection module 90 and the second switch module S2 between the second end of the power conversion module 30 and the load circuit 20, and the second overcurrent protection module 90 is used to disconnect the electrical connection between the second end of the power conversion module 30 and the load circuit 20 when the current output by the power conversion module 30 to the load circuit 20 is greater than a second current threshold.

[0072] In this way, when a short circuit fault occurs in the power supply circuit of the power conversion module 30, the second overcurrent protection module 90 can cut off the electrical connection between the second end of the power conversion module 30 and the load circuit 20, thereby improving the safety of the power circuit 100. The first current threshold and the second current threshold can be equal or different.

[0073] In some embodiments, the power supply circuit 100 further includes a third switch module S3, the third switch module S3 is electrically connected between the second end of the power conversion module 30 and the first power supply 10, and the third switch module S3 is used to conduct the electrical connection between the second end of the power conversion module 30 and the first power supply 10, so that the second power supply 200 can charge the first power supply 10 through the power conversion module 30 and the third switch module S3 in sequence. In addition, when charging the first power supply 10, the second power supply 200 can also supply power to the second controller 21 through the power conversion module 30, the third switch module S3, the first switch module S1 and the first anti-reverse module 50 in sequence.

[0074] In some embodiments, the first controller 40 further controls the first switch module S1 to be turned off, and controls the third switch module S3 to be turned off in response to the power-off instruction.

[0075] In some embodiments, the second controller 21 further controls the second switch module S2 to be disconnected in response to the power-off instruction.

[0076] Therefore, when the vehicle needs to be inspected or the vehicle is turned off, the second controller 21 controls the second switch module S2 to disconnect, so that the integrated controller 110 can be powered off. In this way, it can be avoided that the integrated controller 110 consumes power for a long time, fails to reset after reporting a fault, and the vehicle is powered off incompletely.

[0077] Furthermore, the third switch module S3 is electrically connected to the first controller 40 , and the first controller 40 controls the third switch module S3 to be turned on in response to the start-up instruction, and controls the third switch module S3 to be turned off in response to the power-off instruction.

[0078] In the present invention, the first switch module S1, the second switch module S2 and the third switch module S3 can adopt one or more of various types of switch tubes such as relays, metal oxide semiconductor field effect transistors (metal oxide semiconductor field effect transistors, MOSFET), bipolar junction transistors (bipolar junction transistors, BJT) and insulated gate bipolar transistors (insulated gate bipolar transistors, IGBT), etc. The embodiments of the present invention do not list them one by one.

[0079] In the present invention, the first anti-reverse module 50 and the second anti-reverse module 80 are both diodes.

[0080] In the present invention, the first overcurrent protection module 70 and the second overcurrent protection module 90 may be one or more of a fuse, a fuse, an electronic circuit breaker, a current protection switch and an overcurrent relay.

[0081] In some embodiments, the load circuit 20 may include multiple control boards, which may include a motor control board for controlling electric control, a battery management control board for controlling a battery main contactor, etc. The second switch module S2, the multiple control boards, the first anti-reverse module 50, the detection module 60, the first overcurrent protection module 70, the second anti-reverse module 80 and the second overcurrent protection module 90 may be integrated into one control module to form an integrated controller 110 in the vehicle, so that the degree of integration is higher and it is conducive to the miniaturization design of the control module.

[0082] Please refer again Figure 1 The utility model further provides an electrical device 1, wherein the electrical device 1 comprises the power supply circuit 100 described in any one of the above embodiments.

[0083] Exemplarily, the electrical equipment 1 includes but is not limited to vehicles, robots and other equipment.

[0084] The electrical equipment 1 provided by the utility model controls the second switch module S2 to be turned on after the load circuit 20 receives the power from the first power supply 10 via the first switch module S1, so that the first power supply 10 and the second power supply 200 simultaneously power the load circuit 20. In this way, redundant dual power supply can be provided for the load circuit 20. When the first power supply 10 fails, since the second power supply 200 can continue to supply power, the risk of power failure of the load circuit 20 during power switching can be avoided, and the reliability of power supply can be improved.

[0085] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power supply circuit, characterized in that: The power supply circuit comprises: First power source; A first switch module, electrically connected between the first power supply and a load circuit; a second power source; and A second switch module, electrically connected between the second power supply and the load circuit; The load circuit is electrically connected to the control end of the second switch module, and the load circuit is used to control the on and off of the second switch module; Among them, when the first switch module conducts the electrical connection between the first power supply and the load circuit, the second switch module conducts the electrical connection between the second power supply and the load circuit when the load circuit is powered on, so that the first power supply and the second power supply can supply power to the load circuit at the same time.

2. The power supply circuit according to claim 1, characterized in that The power supply circuit further includes a first controller, which is electrically connected to the first switch module. The first controller controls the first switch module to be turned on in response to a start-up instruction.

3. The power supply circuit according to claim 2, characterized in that: The load circuit includes a second controller, the second controller is electrically connected to the second switch module, and the second controller is used to control the second switch module to be turned on when powered on.

4. The power supply circuit according to claim 3, characterized in that: The power supply circuit also includes a first anti-reverse module, which is connected in series with the first switch module between the first power supply and the load circuit, and the first anti-reverse module is used to achieve unidirectional conduction from the first power supply to the load circuit.

5. The power supply circuit according to claim 4, characterized in that: The power supply circuit also includes a detection module, which is electrically connected between the first anti-reverse module and the first power supply, and is used to detect the voltage of the first power supply, and determine whether the first power supply can supply power normally according to the voltage of the first power supply, and when it is determined that the first power supply cannot supply power normally, output a fault signal to the first controller, so that the first controller records the fault.

6. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes a power conversion module electrically connected between the second power supply and the second switch module, the power conversion module includes a first end and a second end, the first end is electrically connected to the second power supply, the second end is electrically connected to the second switch module, the power conversion module is used to receive a first voltage provided by the second power supply through the first end, convert the first voltage into a second voltage, and output the second voltage through the second end.

7. The power supply circuit according to claim 6, characterized in that: The power supply circuit also includes a second anti-reverse module, which is connected in series with the second anti-reverse module and the second switch module between the second end of the power conversion module and the load circuit, and the second anti-reverse module is used to achieve unidirectional conduction from the second end of the power conversion module to the load circuit.

8. The power supply circuit according to claim 1, wherein: The power supply circuit also includes a first overcurrent protection module, which is connected in series with the first switch module between the first power supply and the load circuit. The first overcurrent protection module is used to disconnect the electrical connection between the first power supply and the load circuit when the current output by the first power supply to the load circuit is greater than a first current threshold.

9. The power supply circuit according to claim 6, characterized in that: The power supply circuit also includes a second overcurrent protection module, which is connected in series with the second switch module between the second end of the power conversion module and the load circuit. The second overcurrent protection module is used to disconnect the electrical connection between the second end of the power conversion module and the load circuit when the current output by the power conversion module to the load circuit is greater than a second current threshold.

10. The power supply circuit according to claim 6, characterized in that: The power supply circuit also includes a third switch module, which is electrically connected between the second end of the power conversion module and the first power supply. The third switch module is used to conduct the electrical connection between the second end of the power conversion module and the first power supply, so that the power conversion module can charge the first power supply through the third switch module.

11. The power supply circuit according to claim 2, characterized in that: The first controller also controls the first switch module to be disconnected in response to a power-off instruction.

12. The power supply circuit according to claim 3, characterized in that: The second controller also controls the second switch module to be disconnected in response to the power-off instruction.

13. The power supply circuit according to claim 1, wherein: The second power source includes a power battery.

14. An electrical device, characterized in that: The electrical equipment comprises the power supply circuit as claimed in any one of claims 1 to 13.

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