CN218498810U

CN218498810U - Power supply protection circuit

Info

Publication number: CN218498810U
Application number: CN202222281800.8U
Authority: CN
Inventors: 刘智伟; 胡俊强
Original assignee: Pateo Connect and Technology Shanghai Corp
Current assignee: Pateo Connect and Technology Shanghai Corp
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2023-02-17
Anticipated expiration: 2032-08-29

Abstract

The embodiment of the application discloses power supply protection circuit, wherein, power supply protection circuit includes: POC module, overcurrent protection module, switch module, host system and voltage acquisition module, wherein: one end of the over-current protection module is connected with one end of the switch module, and the other end of the over-current protection module is connected with one end of the POC module; the other end of the switch module is connected with the main control module; the overcurrent protection module is also connected with the voltage acquisition module; when the POC module is in overcurrent, the overcurrent protection module generates voltage drop or blockage; the voltage acquisition module acquires voltage values at two ends of the overcurrent protection module and feeds the voltage values back to the main control module, and the main control module controls the switch module to be in an open state or a closed state according to the voltage values, so that the POC module can be connected with or disconnected from a power supply.

Description

Power supply protection circuit

Technical Field

The embodiment of the application relates to a circuit protection technology, and relates to but is not limited to a power supply protection circuit.

Background

In the circuit design in the related technology, the power supplied by the vehicle machine to the camera is basically directly output, and at most one safety resistor is added, so that complete protection equipment cannot be damaged, and the problem is difficult to judge and quickly process and solve when a fault occurs.

SUMMERY OF THE UTILITY MODEL

An object of the present application is to provide a power supply protection circuit, which is advantageous in that the power supply protection circuit can actively control the output of a power supply, thereby ensuring that each module of a device is not damaged.

Another object of the present invention is to provide a voltage drop module of a power supply protection circuit, which is advantageous in that if a short circuit occurs before a device is started, the voltage drop module can directly turn off a power supply, thereby protecting each module of the device from being damaged.

Another object of the present invention is to provide an overcurrent protection module of a power supply protection circuit, which is advantageous in that the overcurrent protection module can generate a voltage drop or block in case of overcurrent, thereby protecting a POC module in the power supply circuit from being damaged.

Another objective of the present application is to provide a voltage acquisition module of a power supply protection circuit and a main control module of the power supply protection circuit, which are advantageous in that the main control module can actively control the output of a power supply according to the voltage values at two ends of an over-current protection module acquired by the voltage acquisition module in real time.

Another object of the present invention is to provide a switch module of a power supply protection circuit, which is advantageous in that the switch module can be controlled by a main control module to be in an on or off state, so as to connect or disconnect a power supply to or from a POC module.

Another object of the present application is to provide a transistor and a MOS transistor, which are advantageous in that the transistor can enable the MOS transistor to be in different operating states according to an output of a main control module, and the MOS transistor can enable a power supply to be connected to or disconnected from a POC module according to its operating state.

Another object of the present application is to provide a diode which is advantageous in that it can prevent reverse current from flowing back during power supply.

Another object of the present application is to provide a load, which is advantageous in that it can be secured that the load is not damaged in case of power supply abnormality, short circuit, or the like.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

the embodiment of the application provides a power supply protection circuit, power supply protection circuit includes: POC module, overcurrent protection module, switch module, host system and voltage acquisition module, wherein:

one end of the Over-current protection module is connected with one end of the switch module, and the other end of the Over-current protection module is connected with one end of the POC (Power Over coax, coaxial line transmission Power) module;

the other end of the switch module is connected with the main control module; the overcurrent protection module is also connected with the voltage acquisition module;

when the POC module is in overcurrent, the overcurrent protection module generates voltage drop or blockage;

the voltage acquisition module acquires voltage values at two ends of the overcurrent protection module and feeds the voltage values back to the main control module, and the main control module controls the switch module to be in an open state or a closed state according to the voltage values, so that the POC module can be connected with or disconnected from a power supply.

Drawings

Fig. 1 is a first schematic structural diagram of a power supply protection circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a power supply protection circuit according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a third component of the power supply protection circuit according to the embodiment of the present application;

fig. 4A is a schematic structural diagram of a component of a power supply protection circuit according to an embodiment of the present application;

fig. 4B is a schematic diagram of a working flow of the power supply protection circuit according to the embodiment of the present application.

Detailed Description

The technical solution of the present application is further elaborated below with reference to the drawings and the embodiments. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for the convenience of description of the present application, and have no specific meaning by themselves. Thus, "module", "component" or "unit" may be used mixedly.

It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application are only used for distinguishing similar objects and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may be interchanged under specific ordering or sequence if allowed, so that the embodiments of the present application described herein can be implemented in other orders than illustrated or described herein.

In the following, some technical terms related to the embodiments of the present application are explained:

coaxial: finger Coaxial Cable (Coaxial Cable)

360 degree around looking: the panoramic camera comprises four cameras in front, back, left and right.

POC: a technique for video signal, coaxial control and power superposition based on coaxial cable transmission.

In order to achieve better user experience, a high-definition camera device has been widely used in a vehicle control device in the related art, and a back-up image or a 360-degree around-view image is provided. The common connection is a power transmission that transmits video signals through a coaxial cable and simultaneously supplies power. Since high-definition video signals need to be subjected to data compression, signals transmitted coaxially can be transmitted by using high-frequency signals with very high frequency, and a POC network circuit is added for isolating mutual interference between power transmission and the high-frequency signals. The POC circuit is designed to be feasible, and the current is generally designed to be between 500MA (milliampere) and 1A (ampere). Thus, improper operation during equipment use, cable breakage, camera mismatching, installation errors and other accidents can all result in short circuits that directly damage POC components. Finally, the car machine or the camera equipment can be damaged, and the images of looking around and backing up cannot be normally watched.

Based on this, an embodiment of the present application provides a power supply protection circuit, fig. 1 is a schematic diagram of a composition structure of the power supply protection circuit according to the embodiment of the present application, and as shown in fig. 1, the power supply protection circuit includes: POC module 11, overcurrent protection module 12, switch module 13, main control module 14 and voltage acquisition module 15, wherein:

one end of the over-current protection module 12 is connected with one end of the switch module 13, and the other end of the over-current protection module 12 is connected with one end of the POC module 11;

the other end of the switch module 13 is connected with the main control module 14; the overcurrent protection module 12 is also connected with the voltage acquisition module 15;

when the POC module 11 is overcurrent, the overcurrent protection module 12 generates a voltage drop or a blockage;

the voltage collecting module 15 collects voltage values at two ends of the overcurrent protection module 12 and feeds the voltage values back to the main control module 14, and the main control module 14 controls the switch module 13 to be in an open state or a closed state according to the voltage values, so that the POC module 11 can be connected with or disconnected from a power supply.

In some embodiments, the power protection circuit further comprises a load connected with the POC module; therefore, the power supply protection circuit can ensure that the load connected with the POC module is not damaged under the conditions of abnormal power supply, short circuit and the like.

Based on the foregoing embodiment, an embodiment of the present application further provides a power supply protection circuit, and fig. 2 is a schematic diagram of a composition structure of the power supply protection circuit according to the embodiment of the present application, and as shown in fig. 2, the power supply protection circuit further includes: a pressure drop module 16, wherein:

one end of the voltage drop module 16 is connected between the overcurrent protection module 12 and the POC module 11, and the other end is connected to the switch module 13;

the voltage acquisition module 15 acquires voltage values at two ends of the overcurrent protection module 12 and feeds the voltage values back to the main control module 14, and the main control module 14 controls the switch module 13 to be in an open state or a closed state according to the voltage values, so that the POC module 11 can be connected with or disconnected from a power supply;

when a short circuit occurs before the device where the POC module 11 is located is started, the voltage drop module 16 is turned on, and the voltage output by the main control module 14 is pulled down, so that the switch module 13 is turned off; therefore, if short circuit occurs before the equipment is started, the voltage drop module can directly turn off the power supply, so that each module of the equipment is not damaged.

In some embodiments, the power supply protection circuit further comprises a second diode, one end of the second diode is connected to the overcurrent protection module, and the other end of the second diode is connected to the voltage drop module;

the second diode prevents reverse current from flowing back during power supply.

Based on the foregoing embodiments, an embodiment of the present application further provides a power supply protection circuit, where the power supply protection circuit includes: POC module, overcurrent protection module, switch module, host system and voltage acquisition module, wherein:

one end of the overcurrent protection module is connected with one end of the switch module, the other end of the overcurrent protection module is connected with one end of the POC module, and the overcurrent protection module comprises a safety resistor;

the voltage acquisition module comprises a first acquisition module and a second acquisition module;

one end of the first acquisition module is connected with one end of the safety resistor, and the other end of the first acquisition module is connected with the first analog-to-digital converter;

one end of the second acquisition module is connected with the other end of the safety resistor, and the other end of the second acquisition module is connected with the second analog-to-digital converter;

In some embodiments, the first acquisition module comprises a first resistor, a second resistor, and a first capacitor, and the second acquisition module comprises a third resistor, a fourth resistor, and a second capacitor;

the first resistor is connected with the first capacitor in parallel, one end of the first resistor is grounded, the other end of the first resistor is connected with one end of the second resistor and the first analog-to-digital converter, and the other end of the second resistor is connected with one end of the safety resistor;

the third resistor is connected with the second capacitor in parallel, one end of the third resistor is grounded, the other end of the third resistor is connected with one end of the fourth resistor and the second analog-to-digital converter, and the other end of the fourth resistor is connected with the other end of the safety resistor;

therefore, the voltage difference between the two ends of the overcurrent protection module can be acquired through the first resistor, the second resistor, the fourth resistor, the first capacitor and the second capacitor, and whether the power supply is abnormal or not is judged; meanwhile, the upper voltage limit of the main control module can be ensured not to exceed a preset threshold value.

one end of the over-current protection module is connected with one end of the switch module, and the other end of the over-current protection module is connected with one end of the POC module;

the other end of the switch module is connected with the main control module, and the switch module comprises a first switch tube and a second switch tube; the overcurrent protection module is also connected with the voltage acquisition module;

the first switch tube enables the second switch tube to be in different working states according to the output of the main control module;

the second switch tube enables the power supply to be connected with or disconnected from the POC module according to the working state of the second switch tube;

In some embodiments, the switch module further comprises fifth through ninth resistors;

the first end of the first switch tube is grounded, the second end of the first switch tube is connected with the main control module through a fifth resistor and a sixth resistor and is also connected with one end of a seventh resistor, and the other end of the seventh resistor is grounded;

the first end of the second switch tube is connected with the power supply and one end of an eighth resistor; the second end of the second switch tube is connected with the voltage acquisition module; the third end of the second switch tube is connected with the other end of the eighth resistor and is also connected with the third end of the first switch tube through the ninth resistor; therefore, the first switch tube can be used for enabling the second switch tube to be in different working states, and the second switch tube is further used for enabling the power supply to be connected with or disconnected from the POC module.

In some embodiments, the other end of the voltage drop module is connected between the fifth resistor and the sixth resistor;

the main control module comprises an MCU (Micro Controller Unit), and the voltage drop module comprises a first diode; therefore, whether the power supply supplies power to the POC module or not can be controlled by using the voltage output by the MCU.

In some embodiments, the first switch tube is a triode and the second switch tube is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS Transistor).

Based on the foregoing embodiment, an embodiment of the present application further provides a power supply protection circuit, and fig. 3 is a schematic diagram of a composition structure of the power supply protection circuit according to the embodiment of the present application, as shown in fig. 3, the power supply protection circuit includes: POC module, first diode D1, second diode D2, insurance resistance F1, first resistance R1 to ninth resistance R9, first electric capacity C1 and second electric capacity C2, triode Q1, MOS pipe Q2, first analog-to-digital converter ADC1, second analog-to-digital converter ADC2, master control MCU and POWER supply POWER, wherein:

one end of the POC module is connected to one end of the first diode D1 and is also connected to one end of the second diode D2, and the other end of the second diode D2 is connected to one end of the safety resistor F1;

the first resistor R1 is connected in parallel with the first capacitor C1, one end of the first resistor R1 is grounded, the other end of the first resistor R1 is connected with one end of the second resistor R2 and is further connected with the first analog-to-digital converter ADC1, and the other end of the second resistor R2 is connected with one end of the safety resistor F1;

the third resistor R3 is connected in parallel with the second capacitor C2, one end of the third resistor R3 is grounded, the other end of the third resistor R3 is connected with one end of the fourth resistor R4 and is further connected with the second analog-to-digital converter ADC2, and the other end of the fourth resistor R4 is connected with the other end of the safety resistor F1;

the first end of the triode Q1 is grounded, the second end of the triode Q1 is connected with the master control MCU through a fifth resistor R5 and a sixth resistor R6 and is also connected with one end of a seventh resistor R7, and the other end of the seventh resistor R7 is grounded;

the first end of the MOS tube Q2 is connected with the POWER supply POWER and one end of an eighth resistor R8; the second end of the MOS tube Q2 is connected with the other end of the safety resistor F1; a third end of the MOS transistor Q2 is connected to the other end of the eighth resistor R8, and is further connected to a third end of the triode Q1 through the ninth resistor R9;

when the POC module is in overcurrent, the fuse resistor F1 generates voltage drop or is blocked;

the first resistor R1 to the fourth resistor R4, the first capacitor C1, the second capacitor C2, the first analog-to-digital converter ADC1 and the second analog-to-digital converter ADC2 jointly form the voltage acquisition module, and the fifth resistor R5 to the ninth resistor R9, the triode Q1 and the MOS transistor Q2 jointly form the switch module;

the voltage acquisition module acquires voltage values at two ends of the fuse resistor F1 and feeds the voltage values back to the main control MCU, and the main control MCU controls the switch module to be in an open state or a closed state according to the voltage values, so that the POC module can be connected with or disconnected from a POWER supply (POWER);

when a short circuit occurs before the equipment where the POC module is located is started, the first diode D1 is conducted, and the voltage output by the main control MCU is pulled low, so that the switch module is closed;

the second diode D2 prevents reverse current from flowing back during power supply;

the triode Q1 enables the MOS tube Q2 to be in different working states according to the output of the master control MCU;

the MOS tube Q2 enables the POWER supply POWER to be connected with or disconnected from the POC module according to the working state of the MOS tube Q2.

Based on the foregoing embodiment, the embodiment of the present application further provides a power supply protection circuit, which mainly solves the problems that the vehicle-mounted camera is accidentally short-circuited in use, thereby causing permanent damage to the vehicle-mounted device, causing unnecessary property loss and bringing poorer user experience. Also, the power supply protection circuit can provide a reference suggestion for sustainable design improvement.

In order to realize the power supply protection circuit, design increase needs to be considered in the design stage of the car machine circuit, the MCU controls the power supply output of the POC through the added hardware entity circuit, the purpose of protecting equipment from being damaged is achieved, and the data can be fed back to engineers for the purposes of sustainability improvement and quick maintenance.

Fig. 4A is a schematic diagram illustrating a fourth configuration of the power supply protection circuit according to the embodiment of the present application, as shown in fig. 4A, the power supply protection circuit has an active control function and an online problem reporting function, and a power supply can be directly turned off even if a short circuit occurs without MCU control, so as to achieve a protection effect. And Q2 is an MOS (metal oxide semiconductor) tube and controls the power supply to be switched on or off. F1 is a safety resistor, and voltage drop or blocking is generated by overcurrent. D1 and D2 are diodes, which prevent reverse current from flowing back. Q1 is a triode which drives and controls the MOS tube to work. TP1 is a test point, and J1 is a port socket used for connecting a load (such as a vehicle-mounted camera). R is a resistor, C is a capacitor, L is an inductor, and RV is an electrostatic protection element. Of course, other test points may be disposed at any position in the circuit besides TP1, which is not limited in this embodiment of the application.

The working principle of the circuit is as follows:

(1) And a normal working mode: the MCU outputs high level, Q2 is controlled to work through Q1, the POWER supply POWER is output through Q2, F1 and D2, and the POWER supply is supplied to the POC circuit. When the 1-pin voltage of the D1 is higher than the 2-pin voltage (the pin number of the D1 is shown in the figure), the reverse cut-off has no influence on the circuit. ADC 1/ADC 2 is MCU sampling detection, since the current passing through F1 has no large deviation in the voltage of pin 1 and pin 2 of F1 in the designed use range (pin number of F1 is shown in the figure). And further the MCU with no large difference between the ADC1 and the ADC2 can judge that the normal working state is achieved.

(2) And an abnormal current overrun mode: when the external equipment works abnormally and the current demand is increased, F1 overflows, the resistance value begins to increase, the voltage of the pin 1 and the pin 2 of the F1 is different, and at the moment, the MCU can judge that the current exceeds the limit through the difference between the ADC1 and the ADC 2. At this time, the output of the MCU pin is turned off, so that the purpose of turning off the Q2 is achieved, and elements on the POC circuit are protected from being damaged by overcurrent.

(3) And abnormal short circuit generation mode in work: when external equipment or cables are short-circuited in the working process, the current passing through the F1 is increased rapidly, large voltage difference can be generated at two ends of the F1, even the F1 is blocked directly, when the MCU judges that the voltage difference between the ADC1 and the ADC2 exceeds a certain value, a short-circuit event is judged to occur, a POWER POWER supply is turned off, and elements in the POC circuit are protected from being damaged.

(4) And short circuit generation mode before starting the equipment: when external equipment or a cable is short-circuited, the voltage at the TP1 position before the equipment is started is 0V (volt), so that D1 is directly switched on, the output of the MCU is pulled down by D1, Q1 cannot be switched on, and Q2 is always kept switched off, thereby avoiding damaging elements in the POC circuit of the host. ADC 1/ADC 2 detection is all low level, and MCU can judge that the short circuit event happens to the outside.

(5) When the power is turned off, the MCU =0, the voltage of the ADC 1/ADC 2 position is not monitored any more, and MCU data misjudgment is prevented.

In some embodiments, the resistors R1 to R4 and the capacitors C1 and C2 in fig. 4A function to ensure that the upper limit of the MCU does not exceed a preset threshold (e.g. 3.3V), in this embodiment, MCU =1 represents that the MCU outputs a high level, and MCU =0 represents that the MCU outputs a low level.

In some embodiments, resistors R5 through R7 in fig. 4A function to assist the MCU in turning Q1 on. For example, normally the output of the MCU will open when it exceeds 0.6V Q1, and then it will open only after the resistance is increased by 2.5V-3V (for example). And when the MCU outputs a low level, Q1 is closed, and when the MCU outputs a high level, Q1 is opened.

For example, when the device works normally, the sampled voltage value of ADC1 and the voltage value of ADC2 are substantially equal, the port of the MCU outputs a high level, so that Q1 is turned on and Q2 is in a working state, and at this time, the POWER supply supplies POWER to the POC module and the like normally. When the current exceeds the limit or the short circuit occurs during operation, a voltage difference exists between the sampled voltage value of the ADC1 and the voltage value of the ADC2 (i.e., a difference exists between the voltages at the two ends of the F1). When the MCU detects that the voltage difference between the ADC1 port and the ADC2 port is larger than or equal to a preset value (for example, 1V), the judgment that the abnormality exists is made, and at the moment, the port of the MCU outputs a low level, so that Q1 is cut off, Q2 is disconnected, and the POWER supply of the POWER supply POWER is disconnected, so that each equipment module is protected from being damaged. When short circuit occurs before the equipment is started, the voltage of the TP1 test point is 0V before the equipment is started, so that D1 is conducted, the output of the MCU is pulled down by D1, Q1 is cut off, and Q2 is kept closed all the time, so that elements in the POC circuit of the host can be prevented from being damaged.

Fig. 4B is a schematic diagram of a working flow of the POWER supply protection circuit according to the embodiment of the present application, and as shown in fig. 4B, when the POWER supply is 8.5V, the MCU detects the following data to determine the operating state of the circuit:

(1) And if the MCU =1, the ADC 2=8.5V and the ADC 1=8.5V, the equipment works normally.

(2) And if the MCU =1, the ADC 2=8.5V and the ADC1 is less than 8V, the current is overrun, the equipment works in an overload mode, and the MCU turns off the power supply.

(3) And if the MCU =1, the ADC 2=8.5V and the ADC1 is less than or equal to 7.5V, the short circuit occurs in the working process of the equipment, and the MCU turns off the power supply.

(4) And if the MCU =1, the ADC 2=0V and the ADC 1=0V, the short circuit occurs before the equipment works, and the MCU cannot turn on the power supply.

(5) If MCU =0, the power supply value of the ADC (including ADC1 and ADC 2) is no longer monitored and the device is in an off state.

Certainly, in the process, logs can be saved, the MCU uploads the data logs to the TBOX, and then the data is stored in the background, so that engineering personnel can check related data to achieve the purposes of sustainability improvement and rapid maintenance.

The sampling data that above circuit hardware entity module returned, MCU does corresponding processing, the control power is opened and is closed, protective apparatus is not damaged, the operating condition who will judge simultaneously, upload the server backstage by car machine TBOX (Telematics-BOX, car networking system), save the data log, make things convenient for engineering technical staff data to draw, solve the problem, the feedback that the engineer can long-rangely pass through data, judge out the approximate reason of trouble, guide field technical staff to find the root cause of problem fast, reach the purpose of getting rid of the problem fast. The log accumulation can arrange and output reports of data distributed in different regions and different production stages so that engineers can judge regions with multiple faults and multiple links, and the experience accumulation can correct the design of subsequent products and achieve the aim of continuous design improvement.

In the embodiment of the application, the equipment protection mechanism can ensure that each equipment module is not damaged, and the risk of property loss is reduced. Meanwhile, the circuit is simple in design, low in cost and convenient to apply and popularize. Software diagnosis is added, so that the problems can be conveniently and quickly found and solved, and the labor input is reduced. And can realize background data arrangement statistics and realize remote technical support and analysis.

It should be appreciated that reference throughout this specification to "one embodiment" or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, article, or apparatus that comprises the element.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

Features disclosed in several of the circuit embodiments provided herein may be combined in any combination to yield new circuit embodiments without conflict.

The features disclosed in several of the apparatus embodiments provided in the present application may be combined arbitrarily, without conflict, to arrive at new apparatus embodiments.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A power supply protection circuit, characterized in that the power supply protection circuit comprises: POC module, overcurrent protection module, switch module, host system and voltage acquisition module, wherein:

2. The power supply protection circuit according to claim 1, further comprising a voltage drop module, wherein one end of the voltage drop module is connected between the over-current protection module and the POC module, and the other end of the voltage drop module is connected to the switch module;

when a short circuit occurs before the device where the POC module is located is started, the voltage drop module is turned on, and the voltage output by the main control module is pulled down, so that the switch module is turned off.

3. The power supply protection circuit according to claim 2, further comprising a second diode, wherein one end of the second diode is connected to the over-current protection module, and the other end of the second diode is connected to the voltage drop module;

4. The power supply protection circuit according to any one of claims 1 to 3, wherein the overcurrent protection module comprises a fuse resistor;

one end of the second acquisition module is connected with the other end of the safety resistor, and the other end of the second acquisition module is connected with the second analog-to-digital converter.

5. The power supply protection circuit of claim 4, wherein the first acquisition module comprises a first resistor, a second resistor and a first capacitor, and the second acquisition module comprises a third resistor, a fourth resistor and a second capacitor;

the third resistor is connected with the second capacitor in parallel, one end of the third resistor is grounded, the other end of the third resistor is connected with one end of the fourth resistor and the second analog-to-digital converter, and the other end of the fourth resistor is connected with the other end of the safety resistor.

6. The power supply protection circuit according to any one of claims 1 to 3, wherein the switch module comprises a first switch tube and a second switch tube;

and the second switch tube enables the power supply to be connected with or disconnected from the POC module according to the working state of the second switch tube.

7. The power supply protection circuit of claim 6, wherein the switch module further comprises fifth through ninth resistors;

the first end of the second switch tube is connected with the power supply and one end of an eighth resistor; the second end of the second switch tube is connected with the voltage acquisition module; and the third end of the second switch tube is connected with the other end of the eighth resistor and is also connected with the third end of the first switch tube through the ninth resistor.

8. The power supply protection circuit according to claim 7, wherein the other end of the voltage drop module is connected between the fifth resistor and the sixth resistor;

the main control module comprises an MCU, and the voltage drop module comprises a first diode.

9. The power supply protection circuit of claim 6, wherein the first switch tube is a triode and the second switch tube is a MOS tube.

10. The power supply protection circuit according to any of claims 1 to 3, further comprising a load, wherein the load is connected to the POC module.