Automobile emergency starting power supply

Abstract

The utility model discloses an automobile emergency starting power supply which comprises a power supply body, a power supply piece and a PCBA board which are electrically connected are arranged in the power supply body, and an alligator clip is connected to the PCBA board. The PCBA board is provided with an MCU, an alligator clip short circuit and load access identification circuit, an alligator clip port voltage sampling circuit, a source end voltage sampling circuit and a storage battery reverse connection identification circuit, and the alligator clip short circuit and load access identification circuit, the alligator clip port voltage sampling circuit, the source end voltage sampling circuit and the storage battery reverse connection identification circuit are respectively connected with the MCU. According to the alligator clip short circuit and load access identification circuit provided by the utility model, the short circuit and load access conditions of the alligator clip can be identified, and the alligator clip port voltage sampling circuit and the source end voltage sampling circuit are used for identifying the voltage of the alligator clip port and the voltage of a power supply piece. The storage battery reverse connection recognition circuit can recognize whether the two alligator clips are reversely connected with the storage battery or not, and the problem that short circuit is caused and an internal circuit of an automobile is burnt out is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile emergency power supplies, in particular to an automobile emergency starting power supply. Background Art

[0002] At present, with the continuous improvement of people's living standards, cars are becoming more and more popular. Correspondingly, there are more and more on-board devices, such as car chargers, car inverters and car refrigerators. As the number of on-board devices increases, a large amount of power will be consumed by the car battery. When the power of the car battery is too low, it will cause the car to be unable to start.

[0003] Moreover, the power of the car battery will generally decrease after two years of use, making it possible that the car cannot be started at any time. In addition, in cold winters, when the car battery cannot provide sufficient power, the car cannot be started.

[0004] In view of the above-mentioned various situations, when the car cannot be started, it is generally necessary for a car maintenance person to interconnect the car battery in order to start the car.

[0005] Based on this, car emergency starting power supplies began to emerge, and their main function is to start the car when the car is out of power or cannot be started for other reasons. Because of its portability, small size, convenience and practicality, it has become more and more popular.

[0006] However, in the prior art, when connecting the car battery, the car emergency starting power supply is usually connected through a matching battery clamp, and the corresponding battery clamp is divided into a positive terminal clamp and a negative terminal clamp. For unprofessional or uninstructed users, when using it, the corresponding battery clamp is often connected incorrectly, which may cause the internal circuit of the car to burn out. At the same time, when the corresponding positive terminal clamp and negative terminal clamp are not connected in a standardized manner, it is also easy to cause a short circuit or an open circuit, which may also cause the internal circuit of the car to burn out.

[0007] In view of this, it is necessary to propose further improvements to the current structure. Utility Model Content

[0008] Therefore, the purpose of the present invention is to at least to some extent solve the deficiencies in the prior art, thereby providing an automobile emergency starting power supply.

[0009] In order to achieve the above purpose, a technical solution adopted by the present utility model is:

[0010] The utility model provides an automobile emergency starting power supply, comprising a power supply body, wherein an electrically connected power supply component and a PCBA board are provided in the power supply body, and at least two alligator clips for connecting to the automobile are connected to the PCBA board;

[0011] Among them, the PCBA board is provided with an MCU, an alligator clip short circuit and load access identification circuit, an alligator clip port voltage sampling circuit, a source end voltage sampling circuit and a battery reverse connection identification circuit, and the alligator clip short circuit and load access identification circuit, the alligator clip port voltage sampling circuit, the source end voltage sampling circuit and the battery reverse connection identification circuit are respectively connected to the MCU.

[0012] Furthermore, the PCBA board is also provided with a CAR+ connection position, a CAR- connection position, a CAP5+ connection position and a CAP5- connection position, the CAR+ connection position and the CAR- connection position are respectively connected to the two crocodile clips, the CAP5+ connection position is connected to the positive pole of the power supply, and the CAP5- connection position is connected to the CAR- connection position.

[0013] Furthermore, the alligator clip short circuit and load access identification circuit is connected to the Open&Shortscan terminal of the MCU, and the alligator clip short circuit and load access identification circuit is also connected to the CAR+ connection bit and the CAP5+ connection bit.

[0014] Furthermore, the alligator clip short circuit and load access identification circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor and a first diode. The Open & Shortscan end of the MCU is connected to the first resistor, the first resistor is also connected to the second resistor and the base of the first transistor, the emitter of the first transistor is also connected to the second resistor and grounded, the collector of the first transistor is connected to the third resistor, the third resistor is also connected to the interconnected fourth resistor and the base of the second transistor, the fourth resistor is also connected to the interconnected CAP+ and the emitter of the second transistor, the collector of the second transistor is connected to the first diode, the first diode is also connected to the fifth resistor, and the fifth resistor is connected to the CAR+ connection bit.

[0015] Furthermore, the alligator clip port voltage sampling circuit is connected to the CarBattScan AD terminal of the MCU, and the alligator clip port voltage sampling circuit is also connected to the CAR+ connection bit.

[0016] Furthermore, the alligator clip port voltage sampling circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, and a switching diode. The switching diode includes a common end, a first end, and a second end. The MCU also includes multiple DG ends and VDD ends. The CarBattScan AD end of the MCU is connected to the common end of the sixth resistor, the first capacitor, and the switching diode. The sixth resistor is connected to the common end of the seventh resistor, the eighth resistor, the first capacitor, and the switching diode. The first end of the switching diode is connected to any one of the DG ends, and the second end of the switching diode is connected to any one of the VDD ends. The first capacitor is connected to the eighth resistor and any one of the DG ends. The eighth resistor is also connected to the seventh resistor, and the seventh resistor is also connected to the CAR+ connection bit.

[0017] Furthermore, the source terminal voltage sampling circuit is connected to the CAP+_SCAN_AD terminal of the MCU and the CAP5+ connection bit.

[0018] Furthermore, the source-end voltage sampling circuit includes a ninth resistor, a tenth resistor, an eleventh resistor and a second capacitor. The CAP+_SCAN_AD terminal of the MCU is connected to the ninth resistor and the second capacitor. The second capacitor is connected to any one of the DG terminals. The ninth resistor is also connected to the tenth resistor and the eleventh resistor that are interconnected. The tenth resistor is also connected to any one of the DG terminals. The eleventh resistor is also connected to the CAP5+ connection bit.

[0019] Furthermore, the battery reverse connection identification circuit includes a twelfth resistor, a thirteenth resistor, a second diode, a third diode and a third transistor, the base of the third transistor is connected to the CAR- connection position and grounded, the emitter of the third transistor is connected to the twelfth resistor and the second diode, the second diode is also connected to the CAR+ connection position, the collector of the third transistor is also connected to the third diode, the third diode is also connected to the thirteenth resistor and the MCU which are interconnected, and the thirteenth resistor is also connected to any one of the VDD terminals.

[0020] Furthermore, the power supply is a supercapacitor.

[0021] The utility model provides an automobile emergency starting power supply, comprising a power supply body, wherein an electrically connected power supply and a PCBA board are provided in the power supply body, and at least two crocodile clips for connecting to an automobile are connected to the PCBA board; wherein the PCBA board is provided with an MCU, an crocodile clip short circuit and load access identification circuit, an crocodile clip port voltage sampling circuit, a source end voltage sampling circuit, and a battery reverse connection identification circuit, and the crocodile clip short circuit and load access identification circuit, the crocodile clip port voltage sampling circuit, the source end voltage sampling circuit, and the battery reverse connection identification circuit are respectively connected to the MCU. Through the automobile emergency starting power supply provided by the utility model, the crocodile clip short circuit and load access identification circuit can identify the short circuit and load access of the crocodile clip, the crocodile clip port voltage sampling circuit and the source end voltage sampling circuit are used to identify the voltage of the crocodile clip port and the voltage of the power supply, respectively, and the battery reverse connection identification circuit can identify whether the two crocodile clips are reversely connected to the battery, thereby preventing the problem of short circuit and burning of the internal circuit of the automobile. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 This is a circuit connection block diagram of the automobile emergency starting power supply of the present utility model;

[0024] Figure 2 This is a circuit diagram of the alligator clip short circuit and load access identification circuit of the automobile emergency starting power supply of the utility model;

[0025] Figure 3 A schematic diagram of the load access current of the alligator clip short circuit and load access identification circuit of the automobile emergency starting power supply of the present invention;

[0026] Figure 4 This is a circuit diagram of a voltage sampling circuit for an alligator clip port of an automobile emergency starting power supply of the present utility model;

[0027] Figure 5 This is a circuit diagram of a source-end voltage sampling circuit for an automobile emergency starting power supply of the present utility model;

[0028] Figure 6 The utility model is a circuit diagram of a battery reverse connection identification circuit of an automobile emergency starting power supply. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that the descriptions of "first" and "second" in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0031] Please refer to Figures 1 to 6 The utility model provides a car emergency starting power supply, including a power supply body, an electrically connected power supply component and a PCBA board are provided in the power supply body, and at least two alligator clips for connecting to the car are connected to the PCBA board;

[0032] Among them, the PCBA board is equipped with an MCU, an alligator clip short-circuit and load connection identification circuit, an alligator clip port voltage sampling circuit, a source end voltage sampling circuit and a battery reverse connection identification circuit. The alligator clip short-circuit and load connection identification circuit, the alligator clip port voltage sampling circuit, the source end voltage sampling circuit and the battery reverse connection identification circuit are respectively connected to the MCU.

[0033] In this embodiment, the automobile emergency power supply is a special emergency power supply used to power a 12V battery car that cannot ignite and start after the battery is exhausted. It is also applicable to motorcycles, agricultural vehicles, motorboats, etc.; regardless of gasoline or diesel vehicles, any vehicle that uses a 12V battery can be used.

[0034] Specifically, the car emergency starting power supply includes a power supply body, which is equipped with a power supply component and a PCBA board. At least two crocodile clips are connected to the PCBA board. The crocodile clips are used to connect to the car, that is, the power supply component discharges the connected car battery through the crocodile clips.

[0035] The PCBA board is also provided with an MCU, an alligator clip short-circuit and load access identification circuit, an alligator clip port voltage sampling circuit, a source end voltage sampling circuit and a battery reverse connection identification circuit, wherein the alligator clip short-circuit and load access identification circuit is connected to the alligator clip port voltage sampling circuit, the source end voltage sampling circuit and the battery reverse connection identification circuit, and the alligator clip short-circuit and load access identification circuit, the alligator clip port voltage sampling circuit, the source end voltage sampling circuit and the battery reverse connection identification circuit are also connected to the MCU respectively.

[0036] When the alligator clip is clamped on the car battery, the alligator clip short-circuit and load connection identification circuit is used to identify whether the alligator clip is short-circuited and whether a load is connected; the alligator clip port voltage sampling circuit is used to detect the voltage at the alligator clip port; the source end voltage sampling circuit is used to detect the voltage of the power supply; and the battery reverse connection identification circuit is used to detect whether the two alligator clips are connected reversely.

[0037] The power supply body is also equipped with an EC5 charging / discharging interface, a DC charging interface, a USB-C charging interface, a power / forced discharge switch and a display screen.

[0038] Among them, the specific model of MCU is STM32F030CB / LQFP-48(7*7)128K; the power supply is a supercapacitor.

[0039] Furthermore, the PCBA board is also provided with a CAR+ connection position, a CAR- connection position, a CAP5+ connection position and a CAP5- connection position. The CAR+ connection position and the CAR- connection position are respectively connected to two crocodile clips, the CAP5+ connection position is connected to the positive pole of the power supply, and the CAP5- connection position is connected to the CAR- connection position.

[0040] In this embodiment, two alligator clips are respectively connected to the CAR+ connection position and the CAR- connection position on the PCBA board, and the alligator clips include an alligator clip positive electrode and an alligator clip negative electrode. The CAR+ connection position is connected to the positive electrode of the car battery through the alligator clip positive electrode, and the CAR- connection position is connected to the negative electrode of the car battery through the alligator clip negative electrode. In this way, the alligator clips can discharge the depleted car battery from the power supply connected to the PCBA board. Among them, the alligator clips specifically include red and black. The red alligator clip is connected to the CAR+ connection position, and the black alligator clip is connected to the CAR- connection position.

[0041] The CAP5+ connection position and CAP5- connection position are also set on the PCBA board. The CAP5+ connection position is connected to the positive pole of the power supply component, and the CAP5- connection position is connected to the negative pole of the power supply component. The CAP5+ connection position and CAP5- connection position are respectively connected to the CAR+ connection position and CAR- connection position connected to the positive and negative poles of the alligator clip.

[0042] The power supply component is specifically a supercapacitor. The specific type of the power supply component is not limited here and is set according to actual production needs.

[0043] Furthermore, the alligator clip short circuit and load access identification circuit is connected to the Open&Short scan terminal of the MCU, and the alligator clip short circuit and load access identification circuit is also connected to the CAR+ connection bit and the CAP5+ connection bit.

[0044] In this embodiment, the alligator clip short-circuit and load connection identification circuit is connected to the MCU's Open & Short Scan terminal. The Open & Short Scan terminal is an MCU output that allows the MCU to detect whether the alligator clip is properly connected to the vehicle. Regardless of whether the MCU detects a proper connection, it transmits this information to the alligator clip short-circuit and load connection identification circuit. If the MCU fails to detect a normal vehicle battery voltage, the alligator clip short-circuit and load connection identification circuit activates alligator clip short-circuit identification or alligator clip load connection identification. The alligator clip short-circuit and load connection identification circuit is connected to the CAR+ connector on the PCBA board, thereby connecting the alligator clip; the alligator clip short-circuit and load connection identification circuit is also connected to the CAP5+ connector on the PCBA board.

[0045] Furthermore, the alligator clip short circuit and load access identification circuit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor Q1, a second transistor Q2 and a first diode D1. The Open & Short scan end of the MCU is connected to the first resistor R1, the first resistor R1 is also connected to the second resistor R2 and the base of the first transistor Q1, the emitter of the first transistor Q1 is also connected to the second resistor R2 and grounded, the collector of the first transistor Q1 is connected to the third resistor R3, the third resistor R3 is also connected to the interconnected fourth resistor R4 and the base of the second transistor Q2, the fourth resistor R4 is also connected to the interconnected CAP+ and the emitter of the second transistor Q2, the collector of the second transistor Q2 is connected to the first diode D1, the first diode D1 is also connected to the fifth resistor R5, and the fifth resistor R5 is connected to the CAR+ connection bit.

[0046] In this embodiment, when the MCU fails to identify the normal car battery voltage, the alligator clip short circuit and load connection identification circuit will start short circuit identification: the Open & Short scan terminal is set to a high level, the first transistor Q1 and the second transistor Q2 are turned on, the source terminal voltage of the power supply obtained by the CAP5+ connection bit through the source terminal voltage sampling circuit is isolated by the first diode D1, and the fifth resistor R5 is loaded to the CAR+ connection bit, thereby forming a loop of CAP5+ connection bit → second transistor Q2 → first diode D1 → fifth resistor R5 → the resistor connected to the alligator clip port voltage sampling circuit connected to the CAR+ connection bit. When the alligator clip is short-circuited, the MCU will recognize that the alligator clip port sampling circuit connected to the CAP5+ connection bit will detect that the voltage of the port is equal to 0, and the MCU will recognize that the alligator clip is short-circuited.

[0047] If the MCU fails to detect a normal vehicle battery voltage, the alligator clip short-circuit and load connection identification circuit will also initiate load connection identification: setting the Open & Short scan terminal to a high level, turning on the first and second transistors Q1 and Q2. The port voltage of the power supply component obtained by the source voltage sampling circuit at the CAP5+ connection is isolated by the first diode D1, and the fifth resistor R5 is applied to the CAR+ connection. This forms a circuit connecting the circuit from the CAP5+ connection to the second transistor Q2, the first diode D1, the fifth resistor R5, and the alligator clip port voltage sampling resistor connected to the CAR+ connection. When the alligator clip is open, the MCU recognizes that the port voltage detected by the alligator clip port voltage sampling circuit connected to the CAP5+ connection is equal to the divided voltage of the above circuit. When a load is connected, a current iL flows through the first diode D1, the fifth resistor R5, and the load RL. An additional current II flows through the fifth resistor R5, causing a voltage drop across them, which is recognized by the MCU. When the MCU detects that the voltage of the alligator clip port sampling circuit connected to the CAP5+ connection exceeds the threshold, it identifies a load connection. Wherein, iL=2mA.

[0048] Among them, a first diode D1 is connected in series in the identification circuit of the crocodile clip short circuit and identification connection circuit to block the voltage of the crocodile clip from returning to the source end of the power supply; and a fifth resistor R5 is connected in series in the identification circuit, so as to realize current limiting and voltage drop changes generated when the load is connected.

[0049] Among them, the specific model of the first transistor Q1 in this embodiment is C3904, the specific model of the second transistor Q1 is S8550, and the specific model of the first electrode D1 is SS14. The specific models of the above components are not limited here and are set according to actual production requirements.

[0050] Furthermore, the alligator clip port voltage sampling circuit is connected to the CarBattScan AD terminal of the MCU, and the alligator clip port voltage sampling circuit is also connected to the CAR+ connection bit.

[0051] In this embodiment, the alligator clip port voltage sampling circuit is connected to the CarBattScan AD terminal of the MCU. The CarBattScan AD terminal is the AD input of the MCU and is used to detect the voltage of the alligator clip port. The alligator clip port voltage sampling circuit is also connected to the CAR+ connection bit and the negative pole of the power supply component, so that the power supply component can power the alligator clip port voltage sampling circuit, and it is connected to the alligator clip, so that the voltage of the alligator clip port can be detected.

[0052] Furthermore, the alligator clip port voltage sampling circuit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, and a switching diode D16. The switching diode D16 includes a common end, a first end, and a second end. The MCU also includes multiple DG ends and a VDD end. The CarBattScan AD end of the MCU is connected to the common end of the sixth resistor R, the first capacitor C1, and the switching diode D16. The sixth resistor R6 is connected to the seventh resistor R7, the eighth resistor R8, the first capacitor C1, and the common end of the switching diode. The first end of the switching diode D16 is connected to any one of the DG ends, the second end of the switching diode D16 is connected to any one of the VDD ends, the first capacitor C1 is connected to the eighth resistor R8 and any one of the DG ends, the eighth resistor R8 is also connected to the seventh resistor R7, and the seventh resistor R7 is also connected to the CAR+ connection bit.

[0053] In this embodiment, when the alligator clip is normally connected to the car, the CAR+ connection bit and CAR- connection bit terminals to which the alligator clip is connected obtain the car battery voltage, which is divided by the seventh resistor R7 and the eighth resistor R8. The sixth resistor R9 and the first capacitor C1 send the filtered voltage to the CarBattScan AD terminal of the MCU, so that the CarBattScan AD terminal of the MCU can recognize the normal car battery voltage, and then the MCU can recognize that the car battery is normally connected.

[0054] If the MCU's CarBattScan AD terminal fails to detect a normal vehicle battery voltage, it initiates short-circuit detection or load connection detection, setting the MCU's Open & Short scan terminal high. This triggers the alligator clip short-circuit and load connection detection circuits to detect the vehicle battery voltage. When the MCU's Open & Short scan terminal is set high, the specific circuit formed is: CAP5+ connection bit → second transistor Q2 → first diode D1 → fifth resistor R5 → seventh resistor R7 → eighth resistor R8 → ground GD. When the alligator clip is short-circuited, the CarBattScan AD terminal detects that the voltage at the alligator clip port is 0, and the MCU recognizes that the alligator clip is short-circuited. When the alligator clip is open-circuited, the CarBattScan AD terminal detects that the voltage at the alligator clip port is equal to the divided voltage.

[0055] The specific model of the switching diode D16 is BAV99, and the specific model of the first capacitor C1 is 473P.

[0056] Furthermore, the source voltage sampling circuit is connected to the CAP+_SCAN_AD terminal and the CAP5+ connection bit of the MCU.

[0057] In this embodiment, the CAP+_SCAN_AD terminal is the AD input of the MCU, which is used to detect the voltage of the source terminal of the power supply component, and the source terminal voltage sampling circuit is also connected to the CAP5+ connection bit, which is used to connect to the source terminal of the power supply component, so that the CAP+_SCAN_AD terminal can detect the voltage of the source terminal of the power supply component.

[0058] Furthermore, the source-end voltage sampling circuit includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a second capacitor C2. The CAP+_SCAN_AD end of the MCU is connected to the ninth resistor R9 and the second capacitor C2. The second capacitor C2 is connected to any one of the DG ends. The ninth resistor R9 is also connected to the tenth resistor R10 and the eleventh resistor R11 that are interconnected. The tenth resistor R10 is also connected to any one of the DG ends. The eleventh resistor R11 is also connected to the CAP5+ connection position.

[0059] The specific model of the second capacitor C2 is 473 / 10V.

[0060] Furthermore, the battery reverse connection identification circuit includes a twelfth resistor R12, a thirteenth resistor R13, a second diode D2, a third diode D3 and a third transistor Q3, the base of the third transistor Q3 is connected to the CAR-connection position and grounded, the emitter of the third transistor Q3 is connected to the twelfth resistor R12 and the second diode D2, the second diode D2 is also connected to the CAR+connection position, the collector of the third transistor Q3 is also connected to the third diode D3, the third diode D3 is also connected to the thirteenth resistor R13 and the MCU which are interconnected, and the thirteenth resistor R13 is also connected to any one of the VDD terminals.

[0061] In this embodiment, when the two alligator clips are connected to the car battery in the normal direction (i.e., the positive and negative alligator clips are connected to the corresponding positive and negative terminals of the car battery), the battery reverse connection detection circuit does not operate, the output is pulled high by the thirteenth resistor R13, and the MCU recognizes it as a high level. When the alligator clips are connected to the battery in the reverse direction (i.e., the positive and negative terminals of the alligator clips are connected reversely to the positive and negative terminals of the battery), as long as the input voltage greater than 2V is applied to the base circuit of the third transistor Q3 (the negative terminal of the alligator clip → the be terminal of the third transistor Q3 → the twelfth resistor R12 → the second diode D2 → the positive terminal of the alligator clip), the third transistor Q3 turns on, and the collector of the third transistor Q3 is pulled to ground through the third diode D3 and the thirteenth resistor R13, resulting in a low level output, and the MCU recognizes the reverse connection signal.

[0062] Among them, the twelfth resistor R12 plays a role in current limiting; the second diode D2 prevents the Vbe of the third transistor Q3 from being reverse biased when normally connected; the third transistor Q3 is turned on when the alligator clip is reversely connected, and the reverse connection signal is sent from the collector of the third transistor Q3 to the pin of the MCU; the third diode D3 can prevent the signal from outputting a negative voltage; the thirteenth resistor R13 outputs a pull-up resistor.

[0063] The specific models of the second diode D2 and the third transistor D3 are 1N4148, and the specific model of the third transistor Q3 is MMBT3904.

[0064] Furthermore, the specific working steps of the car emergency starting power supply are:

[0065] When the alligator clips are connected to the car battery, the battery reverse connection detection circuit determines whether the clips are connected reversely. When both alligator clips are connected to the car battery in the correct direction (i.e., the positive and negative alligator clips are connected to the corresponding positive and negative terminals of the car battery), the battery reverse connection detection circuit does not operate, the output is pulled high by the thirteenth resistor R13, and the MCU recognizes it as a high level. When the alligator clips are connected to the battery in the reverse direction (i.e., the positive and negative terminals of the alligator clips are connected reversely to the positive and negative terminals of the battery), as long as the input voltage greater than 2V is applied to the base circuit of the third transistor Q3 (the negative terminal of the alligator clip → the be terminal of the third transistor Q3 → the twelfth resistor R12 → the second diode D2 → the positive terminal of the alligator clip), the third transistor Q3 conducts, and the collector of the third transistor Q3 is pulled to ground through the third diode D3 and the thirteenth resistor R13, the output is low, and the MCU recognizes the reverse connection signal.

[0066] When the alligator clip is positively connected to the car battery, the CAR+ connection point and CAR- connection point connected to the alligator clip obtain the car battery voltage, which is divided by the seventh resistor R7 and the eighth resistor R8. The sixth resistor R9 and the first capacitor C1 send the filtered voltage to the CarBattScan AD terminal of the MCU, so that the CarBattScan AD terminal of the MCU can recognize the normal car battery voltage, and then the MCU can recognize that the car battery is normally connected.

[0067] If the MCU fails to detect a normal vehicle battery voltage, the alligator clip short-circuit and load connection identification circuit activates short-circuit detection: the Open & Short scan terminal is set to a high level, turning on the first transistor Q1 and the second transistor Q2. The source voltage of the power supply obtained by the source voltage sampling circuit at the CAP5+ connection is isolated by the first diode D1, and the fifth resistor R5 is loaded to the CAR+ connection, forming a loop: CAP5+ connection → second transistor Q2 → first diode D1 → fifth resistor R5 → seventh resistor R7 → eighth resistor R8 → ground GD. When the alligator clip is short-circuited, the MCU recognizes that the alligator clip port sampling circuit connected to the CAP5+ connection detects that the voltage at the port is equal to 0, and the MCU recognizes that the alligator clip is short-circuited.

[0068] If the MCU fails to detect a normal vehicle battery voltage, the alligator clip short circuit and load connection identification circuit will also initiate load connection identification: the Open & Short scan terminal is set to a high level, turning on the first transistor Q1 and the second transistor Q2. The port voltage of the power supply obtained by the CAP5+ connection bit through the source voltage sampling circuit is isolated by the first diode D1, and the fifth resistor R5 is loaded to the CAR+ connection bit, thus forming a loop: CAP5+ connection bit → second transistor Q2 → first diode D1 → fifth resistor R5 → seventh resistor R7 → eighth resistor R8 → ground GD. When the alligator clip is open, the MCU will recognize that the port voltage detected by the alligator clip port voltage sampling circuit connected to the CAP5+ connection bit is equal to the divided voltage of the above loop.

[0069] The utility model provides an automobile emergency starting power supply, comprising a power supply body, wherein an electrically connected power supply and a PCBA board are provided in the power supply body, and at least two crocodile clips for connecting to an automobile are connected to the PCBA board; wherein the PCBA board is provided with an MCU, an crocodile clip short circuit and load access identification circuit, an crocodile clip port voltage sampling circuit, a source end voltage sampling circuit, and a battery reverse connection identification circuit, and the crocodile clip short circuit and load access identification circuit, the crocodile clip port voltage sampling circuit, the source end voltage sampling circuit, and the battery reverse connection identification circuit are respectively connected to the MCU. Through the automobile emergency starting power supply provided by the utility model, the crocodile clip short circuit and load access identification circuit can identify the short circuit and load access of the crocodile clip, the crocodile clip port voltage sampling circuit and the source end voltage sampling circuit are used to identify the voltage of the crocodile clip port and the voltage of the power supply, respectively, and the battery reverse connection identification circuit can identify whether the two crocodile clips are reversely connected to the battery, thereby preventing the problem of short circuit and burning of the internal circuit of the automobile.

[0070] It should be noted that the various embodiments in the present invention are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0071] It should also be noted that, in the present invention, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0072] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be applied in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A car emergency starting power supply, characterized in that: The power supply comprises a power supply body, wherein an electrically connected power supply component and a PCBA board are provided in the power supply body, and at least two alligator clips for connecting to a car are connected to the PCBA board; Among them, the PCBA board is provided with an MCU, an alligator clip short circuit and load access identification circuit, an alligator clip port voltage sampling circuit, a source end voltage sampling circuit and a battery reverse connection identification circuit, and the alligator clip short circuit and load access identification circuit, the alligator clip port voltage sampling circuit, the source end voltage sampling circuit and the battery reverse connection identification circuit are respectively connected to the MCU.

2. The automobile emergency starting power supply according to claim 1, characterized in that: The PCBA board is also provided with a CAR+ connection position, a CAR- connection position, a CAP5+ connection position and a CAP5- connection position. The CAR+ connection position and the CAR- connection position are respectively connected to the two alligator clips, the CAP5+ connection position is connected to the positive pole of the power supply, and the CAP5- connection position is connected to the CAR- connection position.

3. The automobile emergency starting power supply according to claim 2, characterized in that: The alligator clip short circuit and load access identification circuit is connected to the Open&Short scan end of the MCU, and the alligator clip short circuit and load access identification circuit is also connected to the CAR+ connection bit and the CAP5+ connection bit.

4. The automobile emergency starting power supply according to claim 3, characterized in that: The alligator clip short circuit and load access identification circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, a second transistor and a first diode. The Open & Short scan end of the MCU is connected to the first resistor, the first resistor is also connected to the second resistor and the base of the first transistor, the emitter of the first transistor is also connected to the second resistor and grounded, the collector of the first transistor is connected to the third resistor, the third resistor is also connected to the interconnected fourth resistor and the base of the second transistor, the fourth resistor is also connected to the interconnected CAP+ and the emitter of the second transistor, the collector of the second transistor is connected to the first diode, the first diode is also connected to the fifth resistor, and the fifth resistor is connected to the CAR+ connection bit.

5. The automobile emergency starting power supply according to claim 2, characterized in that: The alligator clip port voltage sampling circuit is connected to the CarBattScan AD terminal of the MCU, and the alligator clip port voltage sampling circuit is also connected to the CAR+ connection bit.

6. The automobile emergency starting power supply according to claim 5, characterized in that: The alligator clip port voltage sampling circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, and a switching diode. The switching diode includes a common end, a first end, and a second end. The MCU also includes multiple DG ends and VDD ends. The CarBattScan AD end of the MCU is connected to the common end of the sixth resistor, the first capacitor, and the switching diode. The sixth resistor is connected to the common end of the seventh resistor, the eighth resistor, the first capacitor, and the switching diode. The first end of the switching diode is connected to any one of the DG ends, and the second end of the switching diode is connected to any one of the VDD ends. The first capacitor is connected to the eighth resistor and any one of the DG ends. The eighth resistor is also connected to the seventh resistor, and the seventh resistor is also connected to the CAR+ connection bit.

7. The automobile emergency starting power supply according to claim 6, characterized in that: The source terminal voltage sampling circuit is connected to the CAP+_SCAN_AD terminal of the MCU and the CAP5+ connection bit.

8. The automobile emergency starting power supply according to claim 7, characterized in that: The source-end voltage sampling circuit includes a ninth resistor, a tenth resistor, an eleventh resistor and a second capacitor. The CAP+_SCAN_AD terminal of the MCU is connected to the ninth resistor and the second capacitor. The second capacitor is connected to any one of the DG terminals. The ninth resistor is also connected to the tenth resistor and the eleventh resistor that are interconnected. The tenth resistor is also connected to any one of the DG terminals. The eleventh resistor is also connected to the CAP5+ connection bit.

9. The automobile emergency starting power supply according to claim 6, characterized in that: The battery reverse connection identification circuit includes a twelfth resistor, a thirteenth resistor, a second diode, a third diode and a third transistor. The base of the third transistor is connected to the CAR- connection position and grounded, the emitter of the third transistor is connected to the twelfth resistor and the second diode, the second diode is also connected to the CAR+ connection position, the collector of the third transistor is also connected to the third diode, the third diode is also connected to the thirteenth resistor and the MCU that are interconnected, and the thirteenth resistor is also connected to any one of the VDD terminals.

10. The automobile emergency starting power supply according to claim 1, characterized in that: The power supply is a supercapacitor.

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