WO2023082083A1

WO2023082083A1 - Voltage measurement circuit, vehicle jump starter and battery clip

Info

Publication number: WO2023082083A1
Application number: PCT/CN2021/129739
Authority: WO
Inventors: 雷云; 张智锋; 林建平
Original assignee: 深圳市华思旭科技有限公司
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2023-05-19
Also published as: CN118044090A

Abstract

Provided in the present application are a voltage measurement circuit, a vehicle jump starter and a battery clip. The voltage measurement circuit comprises a voltage measurement module, a processing module and a switch module, wherein the voltage measurement module is electrically connected to a first positive electrode and a first negative electrode of a vehicle battery, and is used for measuring a voltage between the first positive electrode and the first negative electrode and obtaining a measurement signal according to the voltage between the first positive electrode and the first negative electrode; the switch module is electrically connected to the processing module and the first negative electrode; and the processing module is used for controlling the on-state of the switch module according to the measurement signal. The switch module is electrically connected to the first negative electrode and is used for controlling a loop where the first negative electrode is located, and the voltage measurement module is used for measuring a voltage value between the first positive electrode and the first negative electrode. The processing module can control, according to the voltage between the first electrode and the second electrode, the loop where the first negative electrode is located, thereby realizing automatic logic control.

Description

Voltage detection circuit, vehicle emergency start power supply and battery clip

technical field

The present application relates to the field of circuit technology, in particular to a voltage detection circuit, a vehicle emergency start power supply and a battery clip.

Background technique

Vehicles have always been one of the important means of transportation for human beings. At present, most of the vehicle emergency start power products on the market adopt the switching method of closing the positive pole of the circuit. The switch module of this switching method needs to use more electronic components, which has the problem of high cost.

Contents of the invention

The application discloses a voltage detection circuit, which can solve the technical problem of high cost.

In a first aspect, the present application provides a voltage detection circuit, the voltage detection circuit includes a voltage detection module, a processing module, a switch module and a load port, the load port includes a first positive pole and a first negative pole, the voltage detection The module includes an isolated sensing unit; where,

The voltage detection module is electrically connected to the first positive pole and the first negative pole respectively, and is used to detect the voltage between the first positive pole and the first negative pole, and according to the first positive pole and the first negative pole, A voltage between the first negative electrodes is obtained as a detection signal;

The switch module is electrically connected to the processing module and the first negative electrode respectively;

The processing module is used for controlling the conduction state of the switch module according to the detection signal.

The switch module is electrically connected to the first negative pole, and is used to control the loop of the first negative pole, and the voltage detection module is used to detect the voltage value between the first positive pole and the first negative pole . The processing module can control the circuit where the first negative electrode is located according to the voltage between the first electrode and the second electrode, so as to realize automatic logic control.

Optionally, the voltage detection circuit further includes a power supply terminal, and the switch module is further configured to be electrically connected to the second negative pole of the power supply terminal, and the first positive pole is electrically connected to the second positive pole of the power supply terminal, wherein,

When the switch module is turned on, the first negative electrode can be electrically connected to the second negative electrode through the switch module, so that the power supply terminal can output power for the load port.

Optionally, the isolated sensing unit includes a signal transmitting unit and a signal receiving unit, the signal transmitting unit is electrically connected to the first positive pole and the first negative pole, and the signal receiving unit is electrically connected to the processing module; in,

The signal transmitting unit is used to generate a signal that can be received by the signal receiving unit without electrical coupling based on the voltages of the first positive pole and the first negative pole, and the signal receiving unit is used to generate a signal based on the voltage transmitted from the signal The signal received by the unit sends the detection signal to the processing module.

Optionally, both the negative pole of the signal receiving unit and the ground terminal of the processing module are electrically connected to one end of the switch module, and the negative pole of the signal transmitting unit and the first negative pole are electrically connected to the other end of the switch module. one end.

Optionally, the voltage detection module includes a light emitting unit and a photosensitive unit, the light emitting unit is electrically connected to the first positive electrode and the first negative electrode respectively, and the photosensitive unit is electrically connected to the processing module; wherein,

The light emitting unit is used to send a light signal based on the voltage between the first anode and the first cathode;

The photosensitive unit is used for receiving the light signal and generating the detection signal based on the light signal.

Optionally, the voltage detection circuit further includes a driving module, the driving module is electrically connected to the processing module and the switching module, and the processing module is further configured to send a control signal to the driving module to drive The switch module is turned on.

Optionally, the switch module includes a plurality of NMOS transistors.

Optionally, when the processing module detects that the voltage value between the first positive pole and the first negative pole is greater than 0V, the processing module outputs a control signal, so that the The switch module is on.

Optionally, when the processing module detects that the voltage value between the first positive pole and the first negative pole is greater than or equal to a preset voltage threshold, the processing module outputs a control signal to pass through the The control signal turns on the switch module.

Optionally, when the processing module detects that the voltage value between the first positive pole and the first negative pole drops, or the falling rate reaches a preset falling rate, the processing module outputs a control signal to The switch module is turned on by the control signal.

Optionally, the voltage detection circuit further includes a power supply module, the power supply module is electrically connected to the processing module and the second positive electrode, and the power supply module is used to supply power to the processing module.

In a second aspect, the present application also provides a vehicle emergency start power supply, the emergency start power supply includes the voltage detection circuit and a power supply as described in the first aspect, and the power supply provides voltage/current for the power supply terminal.

In a third aspect, the present application further provides a battery clip, the battery clip includes a housing and the voltage detection circuit as described in the first aspect, at least part of the voltage detection circuit is disposed in the housing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of a framework of a voltage detection circuit provided by an embodiment of the present application.

FIG. 2 is a schematic circuit diagram of a voltage detection module provided in an embodiment of the present application.

FIG. 3 is a schematic circuit diagram of a voltage detection module provided in an embodiment of the present application.

FIG. 4 is a schematic circuit diagram of a switch module and a drive module provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of a voltage detection circuit provided by an embodiment of the present application.

Fig. 6 is a schematic diagram of a vehicle emergency start power supply device provided in an embodiment of the present application.

Fig. 7 is a schematic diagram of a battery clip provided in an embodiment of the present application.

Explanation of symbols: detection signal-CAR_AD, control signal-Mos_EN, voltage detection circuit-1, voltage detection module-11, isolated sensing unit-111, signal transmitting unit-1111, signal receiving unit-1112, light-emitting unit-112, photosensitive Unit-113, load port-12, first positive pole 121, first negative pole 122, processing module-13, switch module-14, power supply terminal-15, second positive pole-151, second negative pole-152, drive module-16 , Power supply module-17, vehicle emergency starting power supply 2, power supply-21, battery clip-3, housing-31, smart battery clip-32.

Detailed ways

The technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all of them. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The "electrical connection" mentioned in the embodiments of the present application may include direct electrical connection or indirect electrical connection, and "connection" may include direct connection or indirect electrical connection.

The present application provides a voltage detection circuit 1 , please refer to FIG. 1 . FIG. 1 is a schematic diagram of a framework of a voltage detection circuit provided in an embodiment of the present application. The voltage detection circuit 1 includes a voltage detection module 11, a processing module 13, a switch module 14 and a load port 12, the load port 12 includes a first positive pole 121 and a first negative pole 122, and the voltage detection module 11 includes an isolated sensor Unit 111; wherein, the voltage detection module 11 is electrically connected to the first positive pole 121 and the first negative pole 122, respectively, for detecting the voltage between the first positive pole 121 and the first negative pole 122, and according to The voltage between the first positive pole 121 and the first negative pole 122 obtains a detection signal CAR_AD; the switch module 14 is electrically connected to the processing module 13 and the first negative pole 122 respectively; the processing module 13 uses The conduction state of the switch module 14 is controlled according to the detection signal CAR_AD.

In the related art, if the circuit where the first positive electrode 121 is located is closed by a switch to realize the output of the power supply terminal to the load port 12, the cost of electronic components required by this switching method may be relatively large; The circuit where the first negative pole 122 is located realizes turning off the power terminal to output to the load port 12. This switching method makes it impossible for the processing module 13 to directly detect the voltage between the first positive pole 121 and the first negative pole 122. , so that the corresponding logic control cannot be realized.

It can be understood that, in this embodiment, the switch module 14 is electrically connected to the first negative pole 122 for controlling the loop of the first negative pole 122, and the voltage detection module 11 is used for detecting the The voltage value between the first positive electrode 121 and the first negative electrode 122 . The processing module 13 can control the circuit where the first negative electrode 122 is located according to the voltage between the first electrode and the second electrode, so as to realize automatic logic control.

In a possible implementation manner, please refer to FIG. 1 again, the voltage detection circuit 1 further includes a power supply terminal 15, and the switch module 14 is also configured to be electrically connected to the second negative pole 152 of the power supply terminal 15, so The first positive pole 121 is electrically connected to the second positive pole 151 of the power supply terminal 15, wherein, when the switch module 14 is turned on, the first negative pole 122 can be realized by the switch module 14 and the second negative pole 152. Electrically connected, so that the power terminal 15 can supply power to the load port 12 output.

Specifically, since the switch module 14 is electrically connected to the first negative pole 122 and the second negative pole 152 respectively, on-off control between the first negative pole 122 and the second negative pole 152 is realized. When the switch module 14 is turned off, the first negative pole 122 is not connected to the second negative pole 152, so that the power supply terminal 15 cannot supply power to the load port 12, and the power supply terminal 15 is cut off. The power supply effect of the load port 12; when the processing module 13 controls the switch module 14 to turn on, the first negative pole 122 and the second negative pole 152 conduct, so that the power supply terminal 15 is the The load port 12 supplies power.

In a possible implementation manner, please also refer to FIG. 2 . FIG. 2 is a schematic diagram of a framework of a voltage detection module provided in an implementation manner of the present application. The isolated sensing unit 111 includes a signal transmitting unit 1111 and a signal receiving unit 1112, the signal transmitting unit 1111 is electrically connected to the first positive pole 121 and the first negative pole 122, and the signal receiving unit 1112 is electrically connected to the processing module 13; wherein, the signal transmitting unit 1111 is configured to generate a signal that can be received by the signal receiving unit 1112 without electrical coupling based on the voltages of the first positive pole 121 and the first negative pole 122, the signal The receiving unit 1112 is configured to send the detection signal to the processing module 13 based on the signal received from the signal transmitting unit 1111 .

Specifically, since the signal transmitting unit 1111 can generate a signal that can be received by the signal receiving unit 1112 without electrical coupling based on the voltages of the first positive pole 121 and the first negative pole 122, so that in the switch When the module 14 is disconnected, the processing module 13 can still detect the voltage value between the first positive pole 121 and the first negative pole 122 through the voltage detection module 11 .

Exemplarily, the non-electrical coupling methods may include optical coupling, acoustic coupling, electromagnetic induction coupling, etc., or other coupling methods that do not require the electrical connection between the signal transmitting unit 1111 and the signal receiving unit 1112, all of which are described in this Within the scope of protection of the application embodiments.

In a possible implementation manner, please also refer to FIG. 3 , which is a schematic circuit diagram of a voltage detection module provided in an implementation manner of the present application. The negative pole of the signal receiving unit 1112 and the ground terminal of the processing module 13 are both electrically connected to one end of the switch module 14, and the negative pole of the signal transmitting unit 1111 is electrically connected to the first negative pole 122 of the switch module 14 the other end of the

In a possible implementation manner, the negative pole of the signal receiving unit 1112, the ground terminal of the processing module 13, and the second negative pole 152 are all electrically connected to one end of the switch module 14. At this time, the second The negative pole 152 provides a ground terminal for the signal receiving unit 1112 and the processing module 13 ; the negative pole of the signal transmitting unit 1111 and the first negative pole 122 are electrically connected to the other end of the switch module 14 .

In this embodiment, please refer to FIG. 3 again. The voltage detection module 11 includes a light emitting unit 112 and a photosensitive unit 113, the light emitting unit 112 is electrically connected to the first positive electrode 121 and the first negative electrode 122 respectively, and the photosensitive unit 113 is electrically connected to the processing module 13 ; Wherein, the light-emitting unit 112 is used to send an optical signal based on the voltage between the first positive electrode 121 and the first negative electrode 122; the photosensitive unit 113 is used to receive the optical signal, and based on the light signal generates the detection signal CAR_AD.

Specifically, the light emitting unit 112 serves as the signal transmitting unit 1111 , and the photosensitive unit serves as the signal receiving unit 1112 . When the two ends of the light-emitting unit 112 are forward current or voltage, the light-emitting unit 112 works normally and emits light. The magnitudes of the forward current or voltage at both ends are positively correlated, that is to say, the greater the forward current or voltage at both ends of the light emitting unit 112 , the greater the light intensity of the light emitted by the light emitting unit 112 .

When the photosensitive unit 113 receives light, the internal resistance of the photosensitive unit 113 decreases, and the degree of reduction of the internal resistance is positively correlated with the light intensity of the received light, that is, the light received by the photosensitive unit 113 The greater the light intensity, the smaller the internal resistance of the photosensitive unit 113 .

In this embodiment, as shown in FIG. 2 , the voltage detection module 11 further includes a voltage dividing resistor, and the photosensitive unit 113 and the voltage dividing resistor are connected to the ground in series. The smaller the internal resistance of the photosensitive unit 113 is, the larger the voltage value of one terminal of the photosensitive unit 113 electrically connected to the voltage dividing resistor is, so that the voltage value of the detection signal CAR_AD generated at one terminal of the photosensitive unit 113 is higher. That is to say, the voltage value of the detection signal CAR_AD is inversely correlated with the internal resistance of the photosensitive unit 113 .

It can be understood that, in this embodiment, through the light emitting unit 112 and the photosensitive unit 113, even when the first negative electrode 122 and the second negative electrode 152 are not conducting, the switch When the module 14 is turned off, the voltage value between the first positive pole 121 and the first negative pole 122 can also be coupled to the processing module 13 through the voltage detection module 11 . In other possible implementation manners, the embodiment of the present application does not limit the circuit of the voltage detection module 11 .

In a possible implementation manner, the light emitting unit 112 may include a light emitting diode, and the photosensitive unit 113 may include a photosensitive diode.

In a possible implementation manner, please refer to FIG. 1 again, the voltage detection circuit 1 further includes a driving module 16, and the driving module 16 is electrically connected to the processing module 13 and the switching module 14 respectively, and the The processing module 13 is further configured to send a control signal Mos_EN to the driving module 16 to drive the switching module 14 to turn on.

It should be noted that, in the circuit, the switch module 14 can use a transistor or a relay as one of the main electronic components. In order to realize automatic logic control, the voltage detection circuit 1 also includes the drive module 16, when When the processing module 13 also sends a control signal Mos_EN to the driving module 16, the driving module 16 can be used to drive the switch module 14 to turn on.

In a possible implementation manner, the switch module 14 includes one or more field effect transistors (MOSFET, MOS).

In a possible implementation manner, the switch module 14 includes one or more NMOS transistors. In a possible implementation manner, please refer to FIG. 4 together. FIG. 4 is a schematic circuit diagram of a switch module and a driving module provided in an implementation manner of the present application. The switch module 14 includes a plurality of NMOS transistors.

It should be noted that, in the circuit diagrams provided in the present application, nodes represented by the same symbols are electrically connected together, such as GND, BAT+, and the like. In each drawing, CAR+ is the first positive pole 121 , CAR- is the first negative pole 122 , BAT+ is the second positive pole 151 , and GND is the second negative pole 152 , which will not be described in detail below.

Specifically, since the momentary current when the vehicle is powered on is relatively large, in this embodiment, the switch module 14 includes a plurality of parallel-connected NMOS transistors, so that the power-on current is dispersed among multiple parallel-connected NMOS transistors, In this way, the electronic components in the switch module 14 are prevented from being damaged by excessive power-on current.

In this embodiment, the switch module 14 adopts NMOS transistors. The difference between NMOS transistors and PMOS transistors is that NMOS transistors have small on-resistance and are easy to manufacture. It can be understood that the switch module 14 adopts NMOS transistors, which can further reduce the material cost of the voltage detection circuit 1 .

In a possible implementation manner, when the processing module 13 detects that the voltage value between the first positive electrode 121 and the first negative electrode 122 is greater than 0V, the processing module 13 outputs the control signal Mos_EN , so that the switch module 14 is turned on by the control signal Mos_EN.

In this way, when the processing module 13 can detect that the voltage value between the first positive pole 121 and the first negative pole 122 of the load port 12 is greater than 0V, that is to say, the load port 12 is connected to the load device at this time (such as a vehicle battery), the two ends of the load device provide voltage to the first positive pole 121 and the first negative pole 122 to drive the light emitting unit 112 to emit light, so that the photosensitive unit 113 sends a corresponding signal to the processing module 13 Detection signal CAR_AD. At this moment, the processing module 13 may control the switch module 14 to be turned on, so that the power terminal 15 outputs power to the load port 12 , so as to supply power to the load device connected to the load port 12 .

In a possible implementation manner, when the processing module 13 detects that the voltage value between the first positive electrode 121 and the first negative electrode 122 is greater than or equal to a preset voltage threshold, the processing module 13 13 outputs a control signal Mos_EN to enable the switch module 14 to be turned on by the control signal Mos_EN.

In this way, when the processing module 13 detects that the voltage value between the first positive electrode 121 and the first negative electrode 122 is greater than or equal to a preset voltage threshold, the processing module 13 controls the switch module 14 to turn on, The power supply end 15 outputs power to the load port 12 , thereby supplying power to the load port 12 . The preset voltage threshold can be set based on the working voltage of the load device connected to the load port 12 , for example, the preset voltage threshold can be 7V, 8V, 9V, 9.5V or 10V. When the load device is a vehicle battery, the power supply terminal 15 is allowed to output power to the load device connected to the load port 12 when the load device reaches a preset voltage threshold, so as to ensure that the vehicle can work normally with its own battery after starting.

It can be understood that, in other possible implementation manners, the preset voltage threshold may change with actual conditions, and the change of the preset voltage threshold may be static or dynamic. The logic of the processing module 13 controlling the driving module 16 may also be different, which is not limited in this application.

In a possible implementation manner, when the processing module 13 detects that the voltage value between the first positive electrode 121 and the first negative electrode 122 drops, or the drop rate reaches a preset drop rate, the The processing module 13 outputs a control signal Mos_EN, so as to enable the switch module 14 to be turned on by the control signal Mos_EN.

In this way, when the voltage value between the first positive pole 121 and the first negative pole 122 drops, or the falling rate reaches a preset falling rate, it indicates that the vehicle is powered off, and the vehicle may be in ignition operation. , at this time, the processing module 13 controls the switch module 14 to turn on, so that the power supply terminal 15 supplies power to the load port 12, thereby supplying power to the connected vehicle and providing electric energy for starting the vehicle. In this way, when the processing module 13 detects that the vehicle is on fire, it is allowed to provide electric energy to the vehicle, so as to realize intelligent power supply and save electricity consumption.

In a possible implementation manner, when the voltage value between the first positive pole 121 and the first negative pole 122 is smaller than the voltage value of the power supply terminal, the processing module 13 sends the control signal to drive the switch module 14 to turn on. In this way, the load device connected to the first positive pole 121 and the first negative pole 122 can be prevented from feeding back current to the power supply at the power supply terminal 15 .

In a possible implementation manner, please refer to FIG. 1 again, the voltage detection circuit 1 further includes a power supply module 17, and the power supply module 17 is electrically connected to the processing module 13 and the second anode 151 respectively, so The power supply module 17 is used to supply power to the processing module 13 .

As an example, the current or voltage provided by the power supply terminal 15 is usually too large to directly supply power to the processing module 13, etc. Therefore, the power supply module 17 is required to adjust the current or voltage provided by the power supply terminal 15 pressure treatment. In this embodiment, the power supply module 17 is electrically connected to the second positive pole 151, and the voltage value provided by the second positive pole 151 is reduced to 5V by the power supply module 17 and transmitted to the processing module 13, In order to make the processing module 13 work normally. In another example, the current or voltage provided by the power supply terminal 15 may be unstable, and the power supply module may perform voltage stabilization processing on the current or voltage provided by the power supply terminal 15 to provide stable current or voltage to the processing module 13 . In addition, the power supply module 17 may also be a combination of the above two examples.

It can be understood that, in other possible implementation manners, as long as the normal operation of the processing module 13 is not affected, for example, an additional power supply is provided to power the processing module 13, the present application does not limit the arrangement of the power supply module 17 .

In a possible implementation manner, please also refer to FIG. 5 , which is a schematic diagram of a voltage detection circuit provided in an implementation manner of the present application. It should be noted that the electronic components and electrical connection shown in FIG. 5 are only an implementation mode provided by the present application, which does not mean that the present application limits the circuit structure of the voltage detection circuit 1 .

Wherein, U3 is the isolated sensing unit 111 , R15 is a current limiting resistor, and D4 is an anti-reverse diode. When CAR+ and CAR- are positively connected to the load device, the light-emitting unit 112 inside U3 starts to work. When the voltage between CAR+ and CAR- is higher, the light intensity of the light-emitting unit 112 inside is greater, and the receiving The better the conduction of the photosensitive unit 113 is, the smaller the internal resistance is. After the photosensitive unit 113 and R14 divide the voltage, the detection signal CAR_AD voltage signal is output, and the detection signal CAR_AD voltage is proportional to the CAR+ voltage value. The processing module 13 can determine the voltage value of the load device by detecting the voltage value of the detection signal CAR_AD. The processing module 13 outputs different control logics according to the voltage values of different load devices, and is used to output the control signal MOS_EN signal, so that the switch module 14 at the negative end of the loop is turned on or off.

In a possible implementation manner, the processing module 13 may include a driver board, a microprocessor, other general-purpose processors, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), One or more of off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components. Wherein, the driver board can include a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

The present application also provides a vehicle emergency starting power supply 2 , please refer to FIG. 6 together. FIG. 6 is a schematic diagram of a vehicle emergency starting power supply device provided in an embodiment of the present application. The vehicle emergency start power supply 2 includes the voltage detection circuit 1 and a power supply 21 as described above, and the power supply 21 provides voltage or current for the power supply terminal 15 . Specifically, for the voltage detection circuit 1, please refer to the above description, and details are not repeated here.

The present application also provides a battery clip 3 , please refer to FIG. 6 and FIG. 7 together. FIG. 7 is a schematic diagram of a battery clip provided in an embodiment of the present application. The battery clip 3 includes a housing 31 and the voltage detection circuit 1 as described above, and at least part of the voltage detection circuit 1 is disposed in the housing 31 .

Specifically, the battery clip 3 also includes two clips 32. Among the two clips 32, one is a positive pole clip, which is used to clamp the positive pole of a load device (such as a car battery), and the other is a negative pole clip. It is clamped on the negative pole of the load device. It can be understood that in other possible implementation manners, the battery clip 3 may also have other structures, which are not limited in this application.

In this paper, specific examples are used to illustrate the principle and implementation of the application. The description of the above implementation is only used to help understand the core idea of the application; at the same time, for those of ordinary skill in the art, according to the ideas of the application, There will be changes in specific implementation methods and application ranges. To sum up, the content of this specification should not be construed as limiting the application.

Claims

A voltage detection circuit, characterized in that the voltage detection circuit includes a voltage detection module, a processing module, a switch module, and a load port, the load port includes a first positive pole and a first negative pole, and the voltage detection module includes an isolated transmission sense unit; among them,

The voltage detection module is electrically connected to the first positive pole and the first negative pole respectively, and is used to detect the voltage between the first positive pole and the first negative pole, and according to the first positive pole and the first negative pole, A voltage between the first negative electrodes is obtained as a detection signal;

The switch module is electrically connected to the processing module and the first negative electrode respectively;

The processing module is used for controlling the conduction state of the switch module according to the detection signal.
The voltage detection circuit according to claim 1, wherein the voltage detection circuit further comprises a power supply terminal, and the switch module is further configured to be electrically connected to the second negative pole of the power supply terminal, and the first positive pole is connected to the The second positive electrode of the power supply terminal is electrically connected, wherein,

When the switch module is turned on, the first negative electrode can be electrically connected to the second negative electrode through the switch module, so that the power supply terminal can output power for the load port.
The voltage detection circuit according to claim 1, wherein the isolated sensing unit comprises a signal transmitting unit and a signal receiving unit, and the signal transmitting unit is electrically connected to the first positive pole and the first negative pole, so The signal receiving unit is electrically connected to the processing module; wherein,

The signal transmitting unit is configured to generate a signal that can be received by the signal receiving unit without electrical coupling based on the voltages of the first positive pole and the first negative pole;

The signal receiving unit is configured to send the detection signal to the processing module based on the signal received from the signal transmitting unit.
The voltage detection circuit according to claim 3, wherein the negative pole of the signal receiving unit and the ground terminal of the processing module are both electrically connected to one end of the switch module, and the negative pole of the signal transmitting unit is connected to the ground terminal of the processing module. The first negative pole is electrically connected to the other end of the switch module.
The voltage detection circuit according to claim 1, wherein the voltage detection module comprises a light-emitting unit and a photosensitive unit, the light-emitting unit is electrically connected to the first positive pole and the first negative pole respectively, and the photosensitive unit The unit is electrically connected to the processing module; wherein,

The light emitting unit is used to send a light signal based on the voltage between the first anode and the first cathode;

The photosensitive unit is used for receiving the light signal and generating the detection signal based on the light signal.
The voltage detection circuit according to claim 1, wherein the switch module comprises a plurality of NMOS transistors.
The voltage detection circuit according to claim 1, wherein when the processing module detects that the voltage value between the first positive pole and the first negative pole is greater than 0V, the processing module outputs a control signal, so as to enable the switch module to be turned on through the control signal.
The voltage detection circuit according to claim 1, wherein when the processing module detects that the voltage value between the first anode and the first cathode is greater than or equal to a preset voltage threshold, the The processing module outputs a control signal, so that the switch module is turned on by the control signal.
The voltage detection circuit according to claim 1, wherein when the processing module detects that the voltage value between the first positive electrode and the first negative electrode drops, or the rate of drop reaches a preset rate of drop Next, the processing module outputs a control signal, so as to turn on the switch module through the control signal.
The voltage detection circuit according to claim 1, wherein the voltage detection circuit further comprises a driving module, the driving module is respectively electrically connected to the processing module and the switching module, and the processing module is also used for Send a control signal to the drive module to drive the switch module to turn on.
The voltage detection circuit according to claim 2, wherein the voltage detection circuit further comprises a power supply module, the power supply module is electrically connected to the processing module and the second positive electrode, and the power supply module is used for Power is supplied to the processing module.
A vehicle emergency start power supply, characterized in that the vehicle emergency start power supply includes the voltage detection circuit and a power supply according to any one of claims 1-11, and the power supply provides voltage or current for the power supply terminal.
A battery clip, characterized in that the battery clip includes a housing and the voltage detection circuit according to any one of claims 1-11, at least part of the voltage detection circuit is arranged in the housing.