Overcurrent detection circuit and system, multi-bridge arm power system, power system and vehicle

Abstract

The utility model relates to an over-current detection circuit and system, a multi-bridge arm power system, a power system and a vehicle. The over-current detection circuit comprises a plurality of over-current detection branches; the overcurrent detection branch comprises an input end used for being electrically connected with a corresponding current sensor and an output end electrically connected to a common end, and the common end is used for being electrically connected with the controller; the over-current detection branch outputs an over-current state signal to the controller according to a current detection signal output by the current sensor, and the over-current state signal represents whether the current branch detected by the current sensor is over-current or not. According to the invention, only one interface of the controller needs to be occupied, the controller does not need to distribute processing resources to realize the judgment of each current detection signal, the overcurrent protection of all current branches can be still realized when the interfaces of the controller are insufficient or the processing resources are insufficient, and the reliability of the system is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply, in particular to an overcurrent detection circuit, system, multi-bridge arm power system, power system and vehicle. BACKGROUND

[0002] In a related system with multiple current branches, overcurrent protection is usually needed for each current branch. When overcurrent occurs, the controller needs to disconnect the current branch to limit the current, thereby achieving overcurrent protection.

[0003] Since overcurrent protection is needed for each current branch, current detection is needed for each current branch. In the traditional scheme, the current detection signal of each current branch is directly output to the corresponding interface of the controller, and the controller determines whether overcurrent occurs in the current branch after receiving the current detection signal.

[0004] When the number of current branches is large, the controller needs to occupy more interfaces and allocate more processing resources to realize the judgment of each current detection signal. When the controller lacks interfaces or processing resources, some current branches cannot realize overcurrent protection, which reduces the reliability of the system. CONTENT OF THE INVENTION

[0005] The present application provides an overcurrent detection circuit, system, multi-bridge arm power system, power system and vehicle, which sets multiple overcurrent detection branches. Each overcurrent detection branch can perform overcurrent judgment according to the current detection signal output by the corresponding current sensor and obtain an overcurrent state signal representing whether the current branch detected by the current sensor is overcurrent. The output end of each overcurrent detection branch is electrically connected to the controller through a common end, so that only one interface of the controller is occupied and the controller does not need to allocate processing resources to realize the judgment of each current detection signal, thereby at least partially solving the above technical problems.

[0006] To achieve the above purpose, according to the first aspect of the present application, an overcurrent detection circuit is provided, which includes multiple overcurrent detection branches.

[0007] The overcurrent detection branch includes an input end for electrical connection with the corresponding current sensor and an output end electrically connected to a common end, and the common end is used for electrical connection with the controller.

[0008] The overcurrent detection branch is used for outputting an overcurrent state signal to the controller according to the current detection signal output by the current sensor, and the overcurrent state signal represents whether the current branch detected by the current sensor is overcurrent.

[0009] Optionally, the overcurrent detection branch includes a comparison unit.

[0010] The comparison unit comprises a first input end for electrically connecting with the current sensor, a second input end for accessing a reference signal, and an output end electrically connected to a common end.

[0011] Optionally, the comparison unit comprises a first comparator.

[0012] The first comparator comprises a non-inverting input end for electrically connecting with the current sensor, an inverting input end for accessing a first reference signal, and an output end electrically connected to a common end.

[0013] Optionally, the overcurrent detection branch further comprises a full-bridge rectification unit.

[0014] The full-bridge rectification unit comprises an input end for electrically connecting with the current sensor, and an output end electrically connected to the non-inverting input end of the first comparator.

[0015] Optionally, the full-bridge rectification unit comprises a rectification bridge.

[0016] The rectification bridge comprises a positive input end for electrically connecting with the current sensor, a negative input end for accessing a platform signal referred to when the current sensor is used for current detection, a positive output end electrically connected to the non-inverting input end of the first comparator, and a negative output end for grounding.

[0017] Optionally, the comparison unit further comprises a second comparator.

[0018] The second comparator comprises an inverting input end electrically connected to the non-inverting input end of the first comparator, a non-inverting input end for accessing a second reference signal, and an output end electrically connected to a common end.

[0019] Optionally, the overcurrent detection branch further comprises an impedance matching unit.

[0020] The impedance matching unit comprises an input end for electrically connecting with the current sensor, and an output end electrically connected to the first input end of the comparison unit.

[0021] Optionally, the impedance matching unit comprises a voltage follower.

[0022] Optionally, the overcurrent detection branch further comprises a diode.

[0023] The diode comprises an anode electrically connected to the output end of the comparison unit, and a cathode electrically connected to a common end.

[0024] According to a second aspect of the present application, there is provided an overcurrent detection system comprising a plurality of current sensors, a controller, and an overcurrent detection circuit according to any one of the above embodiments, one current sensor being electrically connected to one overcurrent detection branch in the overcurrent detection circuit.

[0025] Optionally, the current sensor comprises a Hall element or a current transformer.

[0026] Optionally, the current sensor is also electrically connected with the controller to output the detected current detection signal to the controller.

[0027] The controller is configured to determine whether overcurrent occurs in the corresponding current branch according to the accessed current detection signal.

[0028] According to a third aspect of the present application, a multi-bridge-arm power system is provided, which comprises a multi-bridge-arm power circuit and the overcurrent detection system in any of the above embodiments.

[0029] The current sensor is configured to detect the current of the corresponding bridge arm in the multi-bridge-arm power circuit.

[0030] The controller is electrically connected with each bridge arm in the multi-bridge-arm power circuit and is configured to control the on-off state of each bridge arm.

[0031] According to a fourth aspect of the present application, a power system is provided, which comprises a power battery and the multi-bridge-arm power system in any of the above embodiments.

[0032] The multi-bridge-arm power system is electrically connected with the power battery and is configured to control the charging and / or discharging of the power battery.

[0033] According to a fifth aspect of the present application, a vehicle is provided, which comprises the overcurrent detection circuit in any of the above embodiments, or comprises the overcurrent detection system in any of the above embodiments, or comprises the multi-bridge-arm power system in any of the above embodiments, or comprises the power system in any of the above embodiments.

[0034] The overcurrent detection circuit in the present application is provided with multiple overcurrent detection branches, each of which is capable of making overcurrent determination according to the current detection signal output by the corresponding current sensor and obtaining a flow state signal representing whether the current branch detected by the current sensor is overcurrent, and the output end of each overcurrent detection branch is electrically connected with the controller through a common end; the present application only needs to occupy one interface of the controller and also does not need to make the controller allocate processing resources to realize the determination of each current detection signal, and can still realize overcurrent protection of all current branches when the controller interface is insufficient or the processing resource is insufficient, thereby improving the reliability of the system.

[0035] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0037] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0038] Figure 1 is a structural schematic diagram of an overcurrent detection circuit provided in the exemplary embodiments disclosed in the present application;

[0039] Figure 2 is a structural schematic diagram of an overcurrent detection circuit provided in the exemplary embodiments disclosed in the present application, wherein the overcurrent detection branch includes an impedance matching unit and a comparison unit;

[0040] Figure 3 is a specific circuit implementation schematic diagram of an overcurrent detection branch for detecting a forward current or a direct current in an alternating current by using one comparator, provided in the exemplary embodiments disclosed in the present application;

[0041] Figure 4 is a specific circuit implementation schematic diagram of an overcurrent detection branch for detecting an alternating current by using a rectifier bridge and one comparator, provided in the exemplary embodiments disclosed in the present application;

[0042] Figure 5 is a specific circuit implementation schematic diagram of an overcurrent detection branch for detecting an alternating current by using two comparators, provided in the exemplary embodiments disclosed in the present application. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the protection scope of the present application.

[0044] According to a first aspect of the present application, as shown in Figure 1 , an overcurrent detection circuit is provided, including a plurality of overcurrent detection branches.

[0045] The overcurrent detection branch includes an input end for electrically connecting with a corresponding current sensor and an output end electrically connected to a common terminal J1, and the common terminal J1 is used for electrically connecting with a controller.

[0046] Each current sensor is configured to detect the current of the corresponding current branch and output a corresponding current detection signal.

[0047] Each overcurrent detection branch is configured to output an overcurrent state signal to the controller according to the current detection signal output by the current sensor, the overcurrent state signal indicating whether the current branch detected by the current sensor is overcurrent.

[0048] Each overcurrent detection branch is configured to output an overcurrent state signal to the controller according to the current detection signal output by the current sensor, the overcurrent state signal indicating whether the current branch detected by the current sensor is overcurrent.

[0049] Each overcurrent detection branch is configured to output an overcurrent state signal to the controller according to the current detection signal output by the current sensor, the overcurrent state signal indicating whether the current branch detected by the current sensor is overcurrent.

[0050] Specifically, the first state signal can be a high level, and the second state signal can be a low level. When this mode is adopted, if the controller only needs to know whether there is a current branch that is overcurrent, the output end of each overcurrent detection branch can be directly electrically connected to the controller through the common terminal J1, and the high level and the low level output by each overcurrent detection branch can be integrated at the common terminal J1 in an OR manner, so that the controller receives the integrated target state signal CMP. For example, as long as there is one overcurrent detection branch outputting a high level, the target state signal CMP accessed by the controller through the common terminal J1 is a high level.

[0051] The overcurrent detection circuit in the present application is provided with multiple overcurrent detection branches, each of which can perform overcurrent judgment according to the current detection signal output by the corresponding current sensor and obtain an overcurrent state signal indicating whether the current branch detected by the current sensor is overcurrent. Moreover, the output end of each overcurrent detection branch is electrically connected to the controller through a common terminal. The present application only needs to occupy one interface of the controller and does not need to make the controller allocate processing resources to realize the judgment of each current detection signal, so that the overcurrent protection of all bridge arms can still be realized when the controller interface is insufficient or the processing resources are insufficient, and the reliability of the system is improved.

[0052] As shown in FIG. 1, the overcurrent detection circuit includes multiple overcurrent detection branches. Figure 2 Optionally, each overcurrent detection branch includes a comparison unit and an impedance matching unit.

[0053] The impedance matching unit comprises an input end electrically connected with the current sensor and an output end electrically connected with the first input end of the comparison unit, and the comparison unit comprises a second input end for accessing the reference signal Vref and an output end electrically connected with the common terminal J1.

[0054] The impedance matching unit can realize impedance matching of the front and rear stages, thereby improving the signal quality output to the rear stage and improving the detection precision. Specifically, the impedance matching unit is used to access the current detection signal output by the current sensor and output to the first input end of the comparison unit after impedance matching processing.

[0055] The comparison unit can compare the current detection signal accessed by the first input end and the reference signal Vref accessed by the second input end in a size comparison manner, thereby outputting an overcurrent state signal representing whether the current branch is overcurrent.

[0056] As shown in Figure 3 , optionally, the current sensor comprises a Hall element, the controller comprises a DSP (Digital signal processing), the impedance matching unit comprises a voltage follower U1-1, and the comparison unit comprises a first comparator U1-2.

[0057] The non-inverting input end of the voltage follower U1-1 is electrically connected with the output end of the Hall element to access the initial current detection signal OUT1, the inverting input end of the voltage follower U1-1 is electrically connected with the output end of the voltage follower U1-1, and the output end of the voltage follower U1-1 is also electrically connected with the non-inverting input end of the first comparator U1-2 to output the target current detection signal OUT1-1. The inverting input end of the first comparator U1-2 is used to access the first reference signal Vref1, and the output end of the first comparator U1-2 is electrically connected with the common terminal J1 to be electrically connected with the DSP through the common terminal J1.

[0058] It should be noted that Figure 3 only the specific circuit structure of one overcurrent detection branch is shown in the figure, and actually at least one other overcurrent detection branch is also included. In order to make the figure more concise, Figure 3 the outputs of multiple overcurrent detection branches are integrated into the common terminal J1 so that the DSP accesses the integrated target state signal CMP through the I / O port.

[0059] The Hall element is used to sense the current (in Figure 3 , which can be represented by Current+ and Current-) on the corresponding current branch, and then output the corresponding initial current detection signal OUT1.

[0060] When the current on the current branch is direct current, the initial current detection signal OUT1 output by the Hall element is always a positive value with a relatively fixed amplitude. When the current on the current branch is alternating current, the initial current detection signal OUT1 output by the Hall element is a variable value.

[0061] It should be noted that the Hall element needs to refer to the corresponding platform signal when implementing current detection. When the voltage of the platform signal is 0 and the current on the current branch is sinusoidal alternating current, the initial current detection signal OUT1 output by the Hall element is a sinusoidal variable value with 0 as the axis, and there is positive and negative alternation, specifically positive and negative variable values. When the voltage of the platform signal is a target positive value and the current on the current branch is sinusoidal alternating current with an amplitude less than the target positive value, the initial current detection signal OUT1 output by the Hall element is a sinusoidal variable value with the target positive value as the axis, and there is no positive and negative alternation, specifically a positive variable value.

[0062] Among them, Figure 3 The non-inverting input terminal of the first comparator U1-2 is connected to the target current detection signal OUT1-1 and the inverting input terminal is connected to the first reference signal Vref1. At this time, the first reference signal Vref1 serves as the upper limit of the current. When the target current detection signal OUT1-1 is greater than the first reference signal Vref1, it is determined that overcurrent occurs in the corresponding current branch, and the first comparator U1-2 outputs a high level. This method can only determine the upper limit, and the alternating current is a variable value, which leads to the fact that this method can only determine the positive current of the alternating current and cannot determine the negative current of the alternating current, and the reliability is low. Of course, when applied to direct current, since the direct current only has a fixed positive value, the method can reliably determine the overcurrent of the direct current.

[0063] Optionally, the overcurrent detection branch further comprises a full-bridge rectifier unit, such as Figure 4 As shown in FIG. 1, the full-bridge rectifier unit comprises a rectifier bridge B1.

[0064] Among them, the positive input terminal of the rectifier bridge B1 is electrically connected with the output terminal of the voltage follower U1-1, the negative input terminal of the rectifier bridge B1 is used for connecting the platform signal Vref0, the positive output terminal of the rectifier bridge B1 is electrically connected with the non-inverting input terminal of the first comparator U1-2, and the negative output terminal of the rectifier bridge B1 is used for grounding.

[0065] Among them, the rectifier bridge B1 can full-wave rectify the target current detection signal OUT1-1 output by the voltage follower, so as to output the rectified current detection signal OUT1-2 to the first comparator U1-2.

[0066] No matter whether it is direct current or alternating current, when overcurrent is judged, the rectified current detection signal accessed by the first comparator U1-2 only needs to consider whether it exceeds the upper limit, so that the overcurrent judgment of direct current and alternating current can be reliably realized.

[0067] In other embodiments, other ways other than the rectifier bridge B1 can also be used to realize full-wave rectification.

[0068] As shown in Figure 5 Optionally, the comparison unit further comprises a second comparator U1-3.

[0069] The inverting input terminal of the second comparator U1-3 is electrically connected to the non-inverting input terminal of the first comparator U1-2 to access the target current detection signal OUT1-1 output by the voltage follower U1-1, the non-inverting input terminal of the second comparator U1-3 is used to access the second reference signal Vref2, and the output terminal of the second comparator U1-3 is electrically connected to the common terminal J1.

[0070] When it is alternating current, it needs to be judged by setting the upper limit value and the lower limit value. As mentioned in the above embodiment, the inverting input terminal of the first comparator U1-2 accesses the first reference signal Vref1, at this time the first reference signal Vref1 serves as the upper limit value of the current, when the target current detection signal OUT1-1 is greater than the first reference signal Vref1, it is determined that the corresponding current branch has overcurrent; Similarly, in this embodiment, the non-inverting input terminal of the second comparator U1-3 accesses the second reference signal Vref2, at this time the second reference signal Vref serves as the lower limit value of the current, when the target current detection signal OUT1-1 is less than the second reference signal Vref2, it is also determined that the corresponding current branch has overcurrent.

[0071] Through the first comparator U1-2 and the second comparator U1-3, the upper limit and the lower limit of the alternating current can be judged respectively, so that the overcurrent judgment of the positive current and the negative current of the alternating current can be realized, and the overcurrent judgment of the alternating current can also be reliably realized without the full-bridge rectification unit.

[0072] Optionally, the overcurrent detection branch further comprises a diode, the diode comprising an anode electrically connected to the output terminal of the comparison unit and a cathode electrically connected to the common terminal.

[0073] Specifically, as shown in Figure 4 It comprises a diode D1-1, the anode of the diode D1-1 is electrically connected to the output terminal of the first comparator U1-2, and the cathode of the diode D1-1 is electrically connected to the common terminal J1.

[0074] Specifically, as shown in Figure 5As shown, including diode D1-1 and diode D1-2, the anode of diode D1-1 is electrically connected to the output terminal of the first comparator U1-2, the cathode of diode D1-1 is electrically connected to the common terminal J1, the anode of diode D1-2 is electrically connected to the output terminal of the second comparator U1-3, and the cathode of diode D1-2 is electrically connected to the common terminal J1.

[0075] By setting diodes at the output terminals of the comparators, the unidirectional conduction characteristics of the diodes can be utilized to avoid mutual interference of the overcurrent state signals output by the comparators, thereby improving the reliability of overcurrent detection.

[0076] It should be noted that, Figures 3 to 5 The components not mentioned in the above embodiments are basic components for realizing the basic functions of the circuit, such as resistors R1-1, R1-2, R1-3, R1-4, R1-5, R1-6, R1-7, R10, capacitors C1-1, C1-2, C1-3, C1-4, C1-5, and C1-6, which will not be described herein.

[0077] According to a second aspect of the present application, as Figure 1 As shown, an overcurrent detection system is provided, which includes a plurality of current sensors, a controller, and the overcurrent detection circuit in any of the above embodiments, one current sensor is electrically connected to one overcurrent detection branch in the overcurrent detection circuit.

[0078] The overcurrent detection system in the present application is provided with a plurality of overcurrent detection branches, each of which can perform overcurrent judgment according to the current detection signal output by the corresponding current sensor and obtain an overcurrent state signal representing whether the current branch detected by the current sensor is overcurrent, and the output terminal of each overcurrent detection branch is electrically connected to the controller through a common terminal; the present application only needs to occupy one interface of the controller and also does not need to make the controller allocate processing resources to realize the judgment of each current detection signal, so that the overcurrent protection of all bridge arms can still be realized when the controller interface is insufficient or the processing resource is insufficient, thereby improving the reliability of overcurrent protection.

[0079] Optionally, the current sensor includes a Hall element or a current transformer.

[0080] As mentioned in the above embodiments, a Hall element can be used to realize current detection, and in the present embodiment, in addition to a Hall element, a current transformer or the like can also be used.

[0081] Optionally, the current sensor is also electrically connected to the controller to output the detected current detection signal to the controller; the controller is configured to judge whether the corresponding current branch is overcurrent according to the accessed current detection signal.

[0082] Specifically, asFigure 3 , Figure 4 or Figure 5 As shown in the figure, the target current detection signal OUT1-1 output by the voltage follower U1-1 is directly output to the AD sampling interface of the DSP, and it can be understood that voltage followers U1-2, …, voltage follower U1-n which are not shown are also included, so that the DSP can respectively receive corresponding target current detection signals OUT1-2, …, target current detection signals OUT1-n, and the DSP can respectively make overcurrent judgments on the target current detection signals through its own processing resources.

[0083] Among them, the overcurrent detection circuit and the controller can both realize overcurrent judgment based on the current detection signal, and in this embodiment, the two schemes can exist at the same time, and the scheme corresponding to the controller plays a backup role.

[0084] According to a third aspect of the present application, a multi-bridge-arm power system is provided, comprising a multi-bridge-arm power circuit and an overcurrent detection system in any of the above embodiments.

[0085] The current sensor is used for current detection of the current branch corresponding to the bridge arm in the multi-bridge-arm power circuit.

[0086] The controller is electrically connected with each bridge arm in the multi-bridge-arm power circuit, and is used for controlling the on-off state of each bridge arm.

[0087] Among them, in this embodiment, the overcurrent detection system can be used for current control of the multi-bridge-arm power circuit. In other embodiments, it can also be used for current control of other circuits or devices involving multiple current branches.

[0088] Among them, the control of the controller on the multi-bridge-arm power circuit can adopt the way of limiting current by wave, such as closing all bridge arms in the multi-bridge-arm power circuit when it is detected that overcurrent occurs in a certain current branch, and when the overcurrent condition disappears, the corresponding drive waveform is output again to make the multi-bridge-arm power circuit work again.

[0089] The multi-bridge-arm power system in the present application is provided with multiple overcurrent detection branches, each of which can make overcurrent judgment according to the current detection signal output by the corresponding current sensor and obtain an overcurrent state signal representing whether the current branch detected by the current sensor is overcurrent, and the output end of each overcurrent detection branch is electrically connected with the controller through a common end; the present application only needs to occupy one interface of the controller and also does not need to make the controller allocate processing resources to realize the judgment of each current detection signal, and can still realize overcurrent protection of all bridge arms when the controller interface is insufficient or the processing resource is insufficient, thereby improving the reliability of overcurrent protection.

[0090] According to a fourth aspect of the present application, a power system is provided, comprising a power battery and the multi-bridge-arm power system in any of the above embodiments.

[0091] The multi-bridge-arm power system is electrically connected with the power battery, and is configured to control charging and / or discharging of the power battery.

[0092] In the embodiment, the multi-bridge-arm power system can be specifically a power factor correction (PFC) system. The PFC system can be configured to perform power factor correction when charging the power battery, so as to improve efficiency. The PFC system can also be configured to perform inversion when discharging the power battery, so as to invert direct current output by the power battery into alternating current output.

[0093] The power system in the present application is provided with multiple overcurrent detection branches. Each overcurrent detection branch can perform overcurrent judgment according to a current detection signal output by a corresponding current sensor, and obtain an overcurrent state signal representing whether a current branch detected by the current sensor is overcurrent. The output end of each overcurrent detection branch is electrically connected with the controller through a common terminal. The present application only needs to occupy one interface of the controller and does not need to allocate processing resources of the controller to realize judgment of each current detection signal. The overcurrent protection of all bridge arms can still be realized when the controller interface is insufficient or the processing resource is insufficient, and the reliability of the system is improved.

[0094] According to a fifth aspect of the present application, a vehicle is provided, comprising the overcurrent detection circuit in any of the above embodiments, or comprising the overcurrent detection system in any of the above embodiments, or comprising the multi-bridge-arm power system in any of the above embodiments, or comprising the power system in any of the above embodiments.

[0095] The vehicle in the present application is provided with multiple overcurrent detection branches. Each overcurrent detection branch can perform overcurrent judgment according to a current detection signal output by a corresponding current sensor, and obtain an overcurrent state signal representing whether a current branch detected by the current sensor is overcurrent. The output end of each overcurrent detection branch is electrically connected with the controller through a common terminal. The present application only needs to occupy one interface of the controller and does not need to allocate processing resources of the controller to realize judgment of each current detection signal. The overcurrent protection of all bridge arms can still be realized when the controller interface is insufficient or the processing resource is insufficient, and the reliability of the system is improved.

[0096] The vehicle can be a pure fuel automobile, a pure electric automobile, a plug-in hybrid electric vehicle, or a range-extended hybrid electric vehicle, and the present application does not make specific limitation on this.

[0097] In the description of the present application, the terms "first", "second", etc. are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0098] In the above embodiments, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0099] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0100] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. In the embodiments of the present application, the description of each embodiment is focused on, and the parts not described in detail in a certain embodiment can be referred to the related content of other embodiments. Any brief modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical solution content of the present application still belongs to the scope of the technical solution of the present application.

Claims

1. An overcurrent detection circuit, characterized by comprising: The overcurrent detection branch includes an input end for electrical connection with the corresponding current sensor and an output end electrically connected to a common end for electrical connection with the controller. The overcurrent detection branch is configured to output an overcurrent state signal to the controller according to a current detection signal output by the current sensor, the overcurrent state signal representing whether the current branch detected by the current sensor is overcurrent. The overcurrent detection branch includes a comparison unit.

2. The overcurrent detection circuit of claim 1, wherein The comparison unit includes a first input end for electrical connection with the current sensor, a second input end for accessing a reference signal, and an output end electrically connected to the common end. The comparison unit includes a first comparator.

3. The overcurrent detection circuit of claim 2, wherein, The first comparator includes a non-inverting input end for electrical connection with the current sensor, an inverting input end for accessing a first reference signal, and an output end electrically connected to the common end. The overcurrent detection branch further includes a full-bridge rectification unit.

4. The overcurrent detection circuit of claim 3, wherein The full-bridge rectification unit includes an input end for electrical connection with the current sensor and an output end electrically connected to the non-inverting input end of the first comparator. The full-bridge rectification unit includes a rectification bridge.

5. The overcurrent detection circuit of claim 4, wherein, The rectification bridge includes a positive input end for electrical connection with the current sensor, a negative input end for accessing a platform signal referenced when the current sensor detects current, a positive output end electrically connected to the non-inverting input end of the first comparator, and a negative output end for grounding. The comparison unit further includes a second comparator.

6. The overcurrent detection circuit of claim 3, wherein The second comparator includes an inverting input end electrically connected to the non-inverting input end of the first comparator, a non-inverting input end for accessing a second reference signal, and an output end electrically connected to the common end. The overcurrent detection branch further includes an impedance matching unit.

7. An overcurrent detection circuit according to any one of claims 2 to 6, wherein The impedance matching unit includes an input end for electrical connection with the current sensor and an output end electrically connected to the first input end of the comparison unit. The impedance matching unit includes a voltage follower.

8. The overcurrent detection circuit of claim 7, wherein, The overcurrent detection branch further includes a diode.

9. An overcurrent detection circuit according to any one of claims 2 to 6, wherein The diode includes an anode electrically connected to the output end of the comparison unit and a cathode electrically connected to the common end. The overcurrent detection system includes a plurality of current sensors, a controller, and the overcurrent detection circuit of any one of claims 1 to 9, one of the current sensors being electrically connected to one of the overcurrent detection branches in the overcurrent detection circuit.

10. An overcurrent detection system, characterized by, The current sensor includes a Hall element or a current transformer.

11. The overcurrent detection system of claim 10, wherein The current sensor is further electrically connected to the controller to output the detected current detection signal to the controller.

12. The overcurrent detection system of claim 10 or 11, wherein The controller is configured to determine whether the corresponding current branch is overcurrent according to the accessed current detection signal. The overcurrent detection system includes a multi-bridge-arm power circuit and the overcurrent detection system of any one of claims 10 to 12.

13. A multi-bridge power system, characterized by, The current sensor is configured to detect the current of the corresponding bridge arm of the multi-bridge-arm power circuit. The controller is electrically connected to each bridge arm of the multi-bridge-arm power circuit and is configured to control the on-off state of each bridge arm. The multi-bridge-arm power system includes a power battery and the multi-bridge-arm power system of claim 13.

14. A power system characterized by, ​ The multi-bridge-arm power system is electrically connected with the power battery, and is used for controlling charging and / or discharging of the power battery.

15. A vehicle characterized by comprising: The overcurrent detection circuit according to any one of claims 1 to 9, or the overcurrent detection system according to any one of claims 10 to 12, or the multi-bridge-arm power system according to claim 13, or the power system according to claim 14.

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