Portable spare starting apparatus for vehicle

Abstract

The present application relates to the technical field of automobiles. Disclosed is a portable spare starting apparatus for a vehicle, the apparatus comprising: an internal power supply, a switch circuit, a first voltage measuring circuit, a first electrode clip and a second electrode clip. The first electrode clip and the second electrode clip are configured to connect to a first end and a second end of a vehicle load; the internal power supply is provided with a first electrode and a second electrode, the first electrode being coupled to the first electrode clip, and the second electrode being coupled to the switch circuit; the switch circuit is coupled to the second electrode clip; the first voltage measuring circuit is coupled to the switch circuit, the first electrode and the second electrode, and is configured to measure a first voltage between the first electrode and the second electrode before the switch circuit is turned on; when the first voltage satisfies a first preset condition, the switch circuit is not configured to be turned on. The apparatus can effectively solve the problem of safety in the prior art during processes of starting vehicles.

Description

Portable backup starting device for vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 2024101856944, filed with the Patent Office of China on February 19, 2024, entitled “A Portable Backup Starting Device for Vehicles,” the entire contents of which are hereby incorporated by reference into this application. This application also claims priority to Chinese Patent Application No. 2024203125597, filed with the Patent Office of China on February 19, 2024, entitled “A Portable Backup Starting Device for Vehicles,” the entire contents of which are hereby incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of automobile technology, and in particular to a portable backup starting device for a vehicle. Background Art

[0004] Cars often experience problems with starting. For example, when a car battery fails to start due to various reasons, such as low temperature, aging, or prolonged disuse, a portable backup emergency starting device can be used to jump-start the vehicle. However, in actual use, various abnormal conditions often occur, such as excessive output current and insufficient internal power supply voltage. If the starting device is unable to cope with these conditions, it may cause damage to the vehicle's circuitry or the starting device itself. Summary of the Invention

[0005] In view of this, an embodiment of the present application provides a portable backup starting device for a vehicle, which can effectively solve the safety and other problems in the vehicle starting process in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a portable backup starting device for a vehicle, comprising: an internal power supply, a switch circuit, a first voltage detection circuit, a first electrode clamp and a second electrode clamp,

[0007] The first electrode clamp and the second electrode clamp are configured to be connected to a first end and a second end of a vehicle load,

[0008] The internal power supply has a first electrode and a second electrode, the first electrode is coupled to the first electrode clamp, and the second electrode is coupled to the switch circuit.

[0009] The switch circuit is coupled to the second electrode clamp,

[0010] The first voltage detection circuit is coupled to the switch circuit, the first electrode and the second electrode, and is configured to detect a first voltage between the first electrode and the second electrode before the switch circuit is turned on. The switch circuit is not turned on when the first voltage meets a first preset condition.

[0011] The embodiments of the present application have the following beneficial effects:

[0012] The portable backup starting device for a vehicle according to an embodiment of the present application includes an internal power supply, a switching circuit, a first voltage detection circuit, a first electrode clamp, and a second electrode clamp, wherein the first electrode clamp and the second electrode clamp are configured to be connected to the first end and the second end of the vehicle load, and the internal power supply has a first electrode and a second electrode, the first electrode is coupled to the first electrode clamp, the second electrode is coupled to the switching circuit, and the switching circuit is coupled to the second electrode clamp. The first voltage detection circuit is coupled to the switching circuit, the first electrode, and the second electrode, and the first voltage detection circuit is configured to detect a first voltage between the first electrode and the second electrode before the switching circuit is turned on, and the switching circuit is turned off when the first voltage meets a first preset condition. This device can effectively solve safety and other problems in the vehicle starting process in the prior art. For example, when the internal power supply voltage is insufficient, the control of the switching circuit is suspended to enter a state of protecting the internal power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0014] FIG1 shows a first structural diagram of a portable backup starting device for a vehicle according to an embodiment of the present application;

[0015] FIG2 shows a second structural diagram of the portable backup starting device for a vehicle according to an embodiment of the present application;

[0016] FIG3 shows a first circuit diagram of a portable backup starting device for a vehicle according to an embodiment of the present application;

[0017] FIG4 shows a third structural diagram of the portable backup starting device for a vehicle according to an embodiment of the present application;

[0018] FIG5 shows a second circuit diagram of the portable backup starting device for a vehicle according to an embodiment of the present application;

[0019] FIG6 shows a first schematic diagram of a first voltage detection circuit according to an embodiment of the present application;

[0020] FIG7 shows a fourth structural diagram of a portable backup starting device for a vehicle according to an embodiment of the present application;

[0021] FIG8 shows a second schematic diagram of the first voltage detection circuit according to an embodiment of the present application;

[0022] FIG9 shows another circuit diagram of the switch circuit according to an embodiment of the present application.

[0023] Explanation of main component symbols: 10-vehicle portable backup starting device; BAT-internal power supply; CLIP-electrode clip; 100-switching circuit; 101-first voltage detection circuit; 102-second voltage detection circuit; 103-first indication circuit; 104-voltage stabilizing circuit; 105-first voltage maintaining circuit; 106-second voltage maintaining circuit; 107-first current detection circuit; 108-third voltage detection circuit; 109-first detection signal circuit; 110-second current detection circuit; 111-first resistance detection circuit; 112-second indication circuit; 113-second detection signal circuit; 114-temperature detection circuit. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0025] The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but rather merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0026] Hereinafter, the terms "including", "having" and their cognates used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the aforementioned items, and should not be understood as excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the aforementioned items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the aforementioned items. In addition, the terms "first", "second", "third" and the like are only configured to distinguish descriptions and should not be understood as indicating or implying relative importance.

[0027] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meaning as in the context of the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning unless clearly defined in the various embodiments of the present application.

[0028] Please refer to Figures 1 to 8 for a detailed description of some embodiments of the present application. In the absence of conflict, the following embodiments and features of the embodiments may be combined with each other.

[0029] FIG1 shows a schematic structural diagram of a portable backup starting device 10 for a vehicle according to an embodiment of the present application.

[0030] Exemplarily, the portable vehicle standby starting device 10 includes: an internal power supply BAT, a switching circuit 100, a first voltage detection circuit 101, and an electrode clip CLIP, including a first electrode clip and a second electrode clip. Specifically, the first electrode clip and the second electrode clip are configured to connect to the first and second ends of a vehicle load. The internal power supply BAT has a first electrode and a second electrode, the first electrode being coupled to the first electrode clip, the second electrode being coupled to the switching circuit 100, and the switching circuit 100 being coupled to the second electrode clip. The first voltage detection circuit 101 is coupled to the switching circuit 100, the first electrode, and the second electrode. The first voltage detection circuit 101 is configured to detect a first voltage between the first electrode and the second electrode before the switching circuit 100 is turned on. The switching circuit 100 is turned off when the first voltage meets a first preset condition, and is turned on when the first voltage does not meet the first preset condition.

[0031] In the present application, the vehicle load mainly refers to the vehicle battery. It can be understood that the "first" and "second" in the present application are only configured to distinguish two different electrode clips or electrodes for the convenience of description. Among them, the first electrode clip can be a negative polarity electrode clip CLIP- or a positive polarity electrode clip CLIP+. The first electrode on the internal power supply BAT can be a negative electrode BAT- or a positive electrode BAT+. For example, when the first electrode clip is a negative polarity electrode clip CLIP- and the second electrode clip is a positive polarity electrode clip CLIP+, correspondingly, the first electrode coupled to the first electrode clip should be the negative electrode BAT-, and the second electrode coupled to the second electrode clip should be the positive electrode BAT+. Alternatively, when the first electrode clip is a positive polarity electrode clip CLIP+ and the second electrode clip is a negative polarity electrode clip CLIP-, correspondingly, the first electrode coupled to the first electrode clip is the positive electrode BAT+, and the second electrode coupled to the second electrode clip is the negative electrode BAT-.

[0032] Considering that if the internal power supply BAT voltage drops too low while continuing to power the vehicle, irreversible damage to the internal power supply BAT may occur. For example, the active materials on the electrodes of the internal power supply BAT may be damaged, causing them to lose their responsiveness, thereby shortening the lifespan of the internal power supply BAT. In this embodiment, the voltage state of the internal power supply BAT is detected by the first voltage detection circuit 101 to determine whether it meets a first preset condition. If so, the switch circuit 100 is controlled to be non-conductive, and the internal power supply BAT is no longer powered by the vehicle.

[0033] Exemplarily, when it is detected that the value of the first voltage is less than or equal to the set low voltage threshold, the switch circuit 100 is turned off to enter the state of protecting the internal power supply BAT. It can be understood that the first preset condition is mainly related to the low voltage threshold of the internal power supply BAT. It is worth noting that for different types and quantities of battery positive electrode materials, the low voltage protection point of the corresponding single battery may be different, which may cause the low voltage threshold of the entire internal power supply BAT to be different. For example, the low voltage threshold U in_L = U1 × N, where U1 is the low voltage protection point of a single battery. In this application, the setting of the first preset condition can be adjusted according to the type and quantity of the battery positive electrode material used, and is not specifically limited here.

[0034] For example, in the first case, if a ternary lithium battery or a lithium cobalt oxide battery is used, that is, N ternary lithium batteries or N lithium cobalt oxide batteries are connected in series between the first electrode and the second electrode to form the above-mentioned internal power supply BAT, wherein the voltage range of the ternary lithium battery or the lithium cobalt oxide battery is 3.0V to 3.7V, and the typical value is 3.2V. At this time, the first preset condition can be set as: the value of the first voltage is less than or equal to 3.2N, wherein N is the number of batteries connected in series in the internal power supply BAT. For example, if the internal power supply BAT is composed of 4 ternary lithium batteries connected in series, then the corresponding voltage threshold U in_L The value is 3.2 V*4=12.8 V. That is, if the value of the first voltage is detected to be less than or equal to 12.8 V, the switch circuit 100 is controlled to be non-conductive.

[0035] In the second case, if lithium iron phosphate batteries are used, that is, N lithium iron phosphate batteries are connected in series between the first electrode and the second electrode, where the voltage range of the lithium iron phosphate battery is 2.0V~3.2V, and the typical value is 2.5V. At this time, the first preset condition may be: the value of the first voltage is less than or equal to 2.5N, where N is the number of batteries connected in series in the internal power supply BAT.

[0036] In the third case, if the internal power supply BAT uses a supercapacitor, that is, N supercapacitors are connected in series between the first electrode and the second electrode, where the voltage range of the supercapacitor is 1.8V to 2.5V, and the typical value is 2.0V. At this time, the first preset condition can be set to: the value of the first voltage is less than or equal to 2N, where N is the number of supercapacitors connected in series in the internal power supply BAT.

[0037] In one embodiment, as shown in Figure 2, the first voltage detection circuit 101 includes a sub-first voltage detection circuit 1011 and a microprocessor MCU, wherein the sub-first voltage detection circuit 1011 is coupled to the first electrode, the second electrode and the microprocessor MCU, and the sub-first voltage detection circuit 1011 is configured to detect the first voltage between the first electrode and the second electrode before the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100. When the first voltage meets the first preset condition, the microprocessor MCU is configured to control the switch circuit 100 to not be turned on. Conversely, when the first voltage does not meet the first preset condition, the microprocessor MCU is configured to control the switch circuit 100 to be turned on.

[0038] For example, as shown in FIG3 , the sub-first voltage detection circuit 1011 includes resistors R2 and R6, wherein one end of the resistor R2 is configured to be connected to the first electrode or the second electrode of the internal power supply BAT to collect the voltage signal VIN_VFB of the first voltage. Furthermore, the voltage signal VIN_VFB is configured to be connected to the first pin of the microprocessor MCU (not shown in FIG2 ) so that the microprocessor MCU reads the value U of the first voltage. in , when the value of the first voltage U in Less than or equal to the low voltage threshold U in_L When , the microprocessor MCU controls the switch circuit 100 to be non-conductive and enters a state of protecting the internal power supply BAT.

[0039] Further optionally, in addition to being configured to detect whether the voltage of the internal power supply BAT is too low, the first voltage detection circuit 101 of the above embodiment can also be configured to detect whether the voltage of the internal power supply BAT is too high in some embodiments, thereby implementing protection against excessive voltage of the internal power supply BAT.

[0040] Exemplarily, when the first voltage detection circuit 101 detects that the value of the first voltage of the internal power supply BAT is greater than or equal to the set high voltage threshold, the switch circuit 100 is controlled to be non-conductive to enter a state of protecting the internal power supply BAT. The high voltage threshold mainly depends on the type and quantity of the positive electrode material of the internal power supply BAT. For example, the high voltage threshold U in_H=U2×N, where U2 is the high voltage protection point of a single battery. For example, the high voltage protection point range of a ternary lithium battery is 4.2V~4.5V, with a typical value of 4.3V; the high voltage protection point range of a lithium iron phosphate battery is 3.65V~4.0V, with a typical value of 3.7V; the high voltage protection point range of a supercapacitor is 2.5V~3.6V, with a typical value of 3.0V; N is the number of batteries in series in the internal power supply BAT, etc. For example, when four ternary lithium batteries are connected in series, the high voltage threshold U in_H It is 4.3V×4=17.2V.

[0041] It can be understood that the first voltage detection circuit 101 is used to protect the internal power supply BAT and prevent the internal power supply BAT from being damaged.

[0042] In another embodiment, as shown in FIG5 , the sub-first voltage detection circuit 1011 includes a resistor R4, a resistor R30, a resistor R6, and a capacitor C2, wherein one end of the resistor R4 is configured to be connected to the first electrode or the second electrode of the internal power supply BAT to collect a voltage signal of the first voltage (output from the P44 node in FIG5 ), and then, the collected voltage signal is input to the 13th pin of the microprocessor MCU, so that the microprocessor MCU reads the value U of the first voltage. in , when the value of the first voltage U in Less than or equal to the low voltage threshold U in_L When, or when the value of the first voltage U in Greater than or equal to the high voltage threshold U in_H When , the microprocessor MCU controls the switch circuit 100 to be non-conductive and enters a state of protecting the internal power supply BAT.

[0043] In addition, in order to achieve protection against low voltage of the internal power supply BAT, in some other embodiments, the first voltage detection circuit 101 can adopt the circuit shown in FIG6 , which is composed of an op amp comparator IC3A, diodes D1, D6, D10, D23, D33, a capacitor C7, resistors R15, R27, R28, R13, R16, etc. Among them, the anode of the diode D1 is connected to the anode of the internal power supply BAT, and the cathode of the diode D10 is connected to the switch circuit 100. It can be understood that when the value of the first voltage U in Less than or equal to the low voltage threshold U in_L When the voltage is high, pin 1 of op amp comparator IC3A outputs a high-level signal through diode D10. This high-level signal is configured to control switch circuit 100 to be non-conductive (or disconnected). Further, optionally, this high-level signal can also be configured to drive a buzzer to sound and a light-emitting diode (LED) to light up, indicating that the device has entered a state of protecting the internal power supply BAT.

[0044] As another optional solution, in some other embodiments, the first voltage detection circuit 101 includes a sub-first voltage detection circuit 1011 and a microprocessor MCU, wherein the sub-first voltage detection circuit 1011 can adopt the circuit shown in FIG6. in Less than or equal to the low voltage threshold U in_L When , the first pin of the operational amplifier comparator IC3A outputs a high level signal through the diode D10, and the microprocessor MCU controls the switch circuit 100 to be non-conductive (or disconnected) based on the high level signal.

[0045] Of course, in some other embodiments, the first voltage detection circuit 101 can also protect the internal power supply BAT through a communication cable or other communication methods. For example, if the vehicle portable standby starting device 10 includes a host side containing the internal power supply BAT and a wiring side containing the electrode clip CLIP, and the host side and the wiring side are connected through a physical connector (such as an EC5 connector, etc.), as shown in Figure 7, the host side includes the internal power supply BAT, the first voltage detection circuit 101 and the first microprocessor MCU1, and the wiring side includes the electrode clip CLIP, the switch circuit and the second microprocessor MCU2, wherein the second microprocessor MCU2 and the first microprocessor MCU1 use a cable method, such as a serial port (COM) cable method, etc., of course, other methods can also be used for communication, which is not limited here. Therefore, when the first microprocessor MCU1 detects that the first voltage meets the first preset condition through the first voltage detection circuit 101, it is transmitted to the second microprocessor MCU2 through the communication cable, so that the second microprocessor MCU2 controls the switch circuit 100 to be non-conductive. Optionally, the vehicle portable backup starting device 10 also includes a detection unit for monitoring the temperature of the internal power supply BAT. When the battery temperature of the internal power supply BAT reaches a preset temperature range (such as 65°C to 90°C, with a typical value greater than 80°C), the first microprocessor MCU1 can also use a communication cable or other communication method to transmit it to the second microprocessor MCU2, so that the second microprocessor MCU2 controls the switch circuit 100 to be non-conductive (or disconnected) to enter a state of protecting the internal power supply BAT.

[0046] Similarly, in conjunction with FIG6 , in order to achieve protection against excessive voltage of the internal power supply BAT, in some other embodiments, the first voltage detection circuit 101 further includes a circuit as shown in FIG8 , which is composed of an op amp comparator IC4A, a diode D30, resistors R53, R25, R19, R47, R46, etc., wherein one end of the resistor R19 is connected to the positive electrode of the internal power supply BAT, and the first pin of the op amp comparator IC4A is connected to the negative electrode of the diode D23 in the circuit shown in FIG6 . Thus, when the value of the first voltage U in Greater than or equal to the high voltage threshold U in_HWhen the voltage is 0, pin 1 of op amp comparator IC4A outputs a low-level signal to the cathode of diode D23. At this time, op amp comparator IC3A outputs a high-level signal to control switch circuit 100 to be non-conductive, entering a state to protect internal power supply BAT. Furthermore, this high-level signal can also be configured to drive a buzzer to sound and a light-emitting diode (LED) to illuminate, indicating that the device has entered an overvoltage protection state.

[0047] In another embodiment, referring to FIG. 1 , the portable vehicle backup starting device 10 further includes a second voltage detection circuit 102 coupled to the switch circuit 100, the first electrode clamp, and the second electrode clamp. The second voltage detection circuit 102 is configured to detect a second voltage between the first and second terminals of the vehicle load before the switch circuit 100 is turned on. The switch circuit 100 is turned off when the first voltage satisfies a first preset condition or the second voltage satisfies a second preset condition, and is turned on when the first voltage does not satisfy the first preset condition and the second voltage does not satisfy the second preset condition. It will be appreciated that utilizing the second voltage detection circuit 102 to detect the voltage status of the vehicle load and thereby control the on / off switching of the switch circuit 100 can further improve the operating safety and system reliability of the device.

[0048] For example, the second preset condition may include but is not limited to, the second voltage is a reverse voltage, etc. It can be understood that

[0049] The connection states between the first electrode clamp and the second electrode clamp and the first end and the second end of the vehicle load include a first connection state and a second connection state, wherein the first electrode clamp has the same electrical polarity as the first end of the vehicle load, and the second electrode clamp has the same electrical polarity as the second end of the vehicle load, wherein the first connection state is that the first electrode clamp is connected to the first end and the second electrode clamp is connected to the second end; and the second connection state is that the first electrode clamp is connected to the second end and the second electrode clamp is connected to the first end. In the first connection state, the second voltage is a forward voltage, and in the second connection state, the second voltage is a reverse voltage. If the voltage across the vehicle load is detected to be a reverse voltage, the switch circuit 100 is controlled to not conduct. Further optionally, the absolute value of the reverse voltage is greater than or equal to 0.1V.

[0050] In other embodiments, the second preset condition may also be: the second voltage is a forward voltage, and the absolute value of the forward voltage is less than or equal to 9 V. It is understood that when it is detected that the voltage difference across the vehicle load is a forward voltage, but the forward voltage value is too small, that is, it is lower than the normal output voltage of 9 V, in order to protect the vehicle load, the switch circuit 100 needs to be controlled to be non-conductive.

[0051] In one embodiment, as shown in FIG3 , the second voltage detection circuit 102 primarily includes an op amp comparator U3, resistors R17 and R19, and a diode D5. The input terminal of resistor R17 is configured to connect to a vehicle load. When the voltage at the input terminal of resistor R17 is detected to be lower than a reference voltage, pin 4 of the op amp comparator U3 outputs a high-level signal, which is configured to control the switch circuit 100 to be non-conductive. The reference voltage setting should satisfy the following requirement: the voltage at the inverting input terminal of pin 3 of the op amp comparator U3 is lower than the voltage at the non-inverting input terminal of pin 1 of the op amp comparator U3.

[0052] As an optional solution, the second voltage detection circuit 102 includes a sub-second voltage detection circuit 1021 and a microprocessor MCU (not shown in the figure), wherein the sub-second voltage detection circuit 1021 is coupled to the first electrode clamp, the second electrode clamp, and the microprocessor MCU. The sub-second voltage detection circuit 1021 is configured to detect a second voltage between the first end and the second end before the switch circuit 100 is turned on; the microprocessor MCU is coupled to the switch circuit 100, and when the second voltage meets a second preset condition, the microprocessor MCU controls the switch circuit 100 to be non-conductive. For example, based on the second voltage detection circuit 102 configured to detect the vehicle load voltage shown in Figure 3, the fourth pin of the operational amplifier comparator U3 therein can be further connected to the microprocessor MCU. When the microprocessor MCU receives a high-level signal output by the fourth pin of the operational amplifier comparator U3, it controls the switch circuit 100 to be non-conductive (or disconnected).

[0053] Optionally, the portable vehicle standby starting device 10 further includes a first indicator circuit 103, which is coupled to the second voltage detection circuit 102 and generates a sound and / or light when the second voltage meets a second preset condition. It is understood that the sound / light indication allows the user to intuitively understand the current operating status of the device, allowing appropriate action to be taken when a corresponding fault occurs, such as forced starting or disconnecting the electrode clip CLIP from the vehicle load.

[0054] For example, as shown in FIG3 , the first indicator circuit 103 includes a buzzer LS1, a resistor R22, a light-emitting diode LED3, a resistor R24, a MOS transistor Q6, and a resistor R26 (constituting a driving unit). The first indicator circuit 103 is configured to drive the buzzer LS1 to emit an audible alarm and the light-emitting diode LED3 to emit a red light when the second voltage detection circuit 102 detects that the second voltage satisfies a second preset condition. The operating voltage of the buzzer LS1 is 3V to 24V, with typical values ​​being 3.3V, 5V, and 12V.

[0055] In one embodiment, after the portable vehicle backup starting device 10 is connected to the vehicle load and the conditions for turning on the switch circuit 100 are met, the switch circuit 100 is first turned on to connect the internal power supply BAT to the vehicle load, and then waits for the user to perform an ignition operation. To prevent the internal power supply BAT from being connected to the vehicle load for a long time, this embodiment will automatically disconnect the switch circuit 100 after a certain period of time, that is, disconnect the internal power supply BAT from the vehicle load.

[0056] Exemplarily, the portable vehicle standby starting device 10 further includes a first time control circuit coupled to the switch circuit 100. The first time control circuit is configured to begin counting a first time after the internal power source BAT is connected to the vehicle load. When the first time satisfies a third preset condition, the switch circuit 100 disconnects the internal power source BAT from the vehicle load. For example, the first time control circuit may be a microprocessor MCU, or a timing module.

[0057] Among them, the third preset condition can be set as: the above-mentioned first time is within the range of 10s-120s, such as 20s, 30s, 60s, 80s, etc., which is not limited here and can be set according to actual conditions.

[0058] Furthermore, to stabilize the voltage output by the internal power supply BAT and reduce fluctuations, in some other embodiments, as shown in FIG1 , 2 , or 4 , the portable vehicle backup starting device 10 further includes a voltage stabilizing circuit 104. The voltage stabilizing circuit 104 is coupled to the internal power supply BAT and configured to supply power to the switch circuit 100 and the first voltage detection circuit 101. For example, the voltage provided by the voltage stabilizing circuit 104 is within the range of 2.0-6.0V, and can be specifically set to values ​​such as 2.7V, 3.3V, or 5V.

[0059] For example, as shown in FIG3 , the voltage stabilizing circuit 104 includes a voltage stabilizing chip U1 , capacitors C1 , C2 , C3 , and a resistor R1 , which stabilizes the input voltage and outputs a voltage (such as 5V) to power the microprocessor MCU and various unit circuits in the device.

[0060] Further optionally, to increase the reliability of the voltage stabilizing circuit 104, the portable vehicle backup starting device 10 also includes a first voltage maintaining circuit 105. The first voltage maintaining circuit 105 is coupled to the internal power supply BAT and the voltage stabilizing circuit 104 and is configured to prevent sudden changes in the input voltage of the voltage stabilizing circuit 104. For example, in one embodiment, the first voltage maintaining circuit 105 includes a capacitor and a diode, with the cathode of the diode coupled to the anode of the capacitor. As shown in FIG2 , when the voltage of the internal power supply BAT is pulled low during vehicle starting, the first voltage maintaining circuit 105, consisting of the diode D1 and the capacitor C4, maintains the stability of the system power supply for a certain period of time. The output voltage is generally in the range of 2.5V-13.0V, with a typical value of 5.0V.

[0061] In addition, considering that the internal power supply BAT voltage may be pulled down due to high current discharge during the vehicle startup process, for example, if the internal power supply BAT voltage is 12V and the output current is 400A, the voltage will be instantly pulled down to about 7V. In winter, at low temperatures, this voltage may even be pulled down to 1-2V. At this time, due to the low voltage, the system power supply voltage will be seriously insufficient and the switch circuit 100 cannot be reliably maintained on. Therefore, it is necessary to use corresponding technologies to ensure the reliability of the input voltage of the switch circuit 100. For example, the following solutions can be met, namely, method 1: design a voltage maintenance circuit that can maintain the voltage for a certain period of time; method 2: select (or design) an electronic switch that can remain stably turned on at very low voltage after being turned on; method 3: select an electronic switch that operates at a lower voltage and, if necessary, add a step-down circuit to power the electronic switch.

[0062] In some embodiments, referring to Figures 1, 2, or 4 above, the portable vehicle backup starting device 10 further includes a second voltage maintaining circuit 106, which is coupled to the internal power supply BAT and the switch circuit 100 and is configured to prevent sudden changes in the input voltage of the switch circuit 100. For example, in one embodiment, the second voltage maintaining circuit 106 includes a capacitor and a diode, the cathode of the diode being coupled to the anode of the capacitor. As shown in Figure 2, the second voltage maintaining circuit 106 is composed of a diode D6 and a capacitor C12. The switch circuit 100 is maintained on for a certain period of time (typically greater than 10ms), where the length of time is determined by the capacitance of the capacitor C12.

[0063] When the vehicle load is connected and the switch circuit 100 is normally turned on, considering that the internal power supply BAT may have abnormal conditions such as excessive current after the conduction, for safety reasons, the vehicle portable backup starting device 10 of the present application will also monitor the output current of the internal power supply BAT in real time so as to disconnect it in time when an abnormality occurs.

[0064] In some other embodiments, referring to FIG. 1 above, exemplarily, the vehicle portable backup starting device 10 further includes a first current detection circuit 107, the switch circuit 100 is coupled to the first current detection circuit 107, the first current detection circuit 107 is coupled to the first electrode or the second electrode, and the first current detection circuit 107 is configured to detect a first current flowing through the first current detection circuit 107 after the switch circuit 100 is turned on. The switch circuit 100 is coupled to the first current detection circuit 107, and when the first current meets a fourth preset condition, the internal power supply BAT is disconnected from the vehicle load.

[0065] The fourth preset condition may be set as: the first current is greater than or equal to 1000A, for example, it may be specifically set to 1100A, 1200A, 1300A, etc.

[0066] In one embodiment, as shown in Figure 2, the first current detection circuit 107 includes a sub-first current detection circuit 1071 and a microprocessor MCU. The sub-first current detection circuit 1071 is coupled to the first electrode or the second electrode and is configured to detect the first current flowing through the first current detection circuit 107 after the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100 and the sub-first current detection circuit 1071, and when the first current meets the fourth preset condition, the switch circuit 100 is controlled to disconnect.

[0067] For example, the sub-first current detection circuit 1071 can use a device such as a current-sense resistor to collect current signals, and then transmit the collected current signals to the microprocessor MCU via differential wiring, so that the microprocessor MCU reads and calculates the magnitude of the first current and controls the switch circuit 100 to disconnect when the current is greater than or equal to a set current threshold. It is understood that when performing current detection, in addition to using a current-sense resistor, devices that can collect current, such as Hall current sensors, current transformers, wires, etc., can also be used, and this is not limited here.

[0068] Alternatively, in some other embodiments, the first current detection circuit 107 includes a first current acquisition circuit 1072 and a first circuit 1073. The first current acquisition circuit 1072 is coupled to the first electrode or the second electrode and is configured to acquire the first current. The first circuit 1073 is coupled to the first current acquisition circuit 1072 and the switch circuit 100 and is configured to determine whether the first current satisfies a fourth preset condition. The first current acquisition circuit 1072 may be composed of components such as a current-sense resistor, a Hall current sensor, a current transformer, and a wire. The first circuit 1073 may be a microprocessor MCU with an analog-to-digital conversion (i.e., ADC) function, or may be composed of components such as a discrete ADC module and a comparator. This is not specifically limited here, as long as the first current can be acquired and compared with a set current value to obtain a control signal configured to control the switch circuit 100.

[0069] For example, as shown in FIG3 , the first current acquisition circuit 1072 includes a detection resistor R25, and the first circuit 1073 includes a transistor Q5, resistors R23 and R21, and a microprocessor MCU. When the first current exceeds a threshold value I1, the transistor Q5 turns on and outputs a level signal to pin 10 of the microprocessor MCU. The microprocessor MCU then quickly outputs a shutdown signal to the switch circuit 100 to immediately disconnect the output. Typically, this response time (denoted as T1) should be short to ensure a fast response. The threshold value I1 is typically greater than 800A, with a typical value of 1000A. The typical value of T1 is less than 100ms.

[0070] Considering the possibility of manually forcibly starting the device, in some other embodiments, the portable vehicle backup starting device 10 exemplarily further includes a forced start switch K2, the second voltage detection circuit 102 includes a sub-second voltage detection circuit 1021 and a microprocessor MCU. The sub-second voltage detection circuit 1021 is coupled to the first electrode clamp, the second electrode clamp, and the microprocessor MCU, and is configured to detect a second voltage between the first terminal and the second terminal before the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100, the first voltage detection circuit 101, and the forced start switch K2. When the switch circuit 100 is not turned on when the first voltage does not meet the first preset condition, the second voltage is a positive voltage, and the equivalent resistance RL corresponding to the externally connected vehicle load calculated from the voltage output of the third voltage detection circuit 108 is within a normal range (e.g., greater than or equal to 1Ω), the microprocessor MCU directly controls the switch circuit 100 to turn on after the forced start switch K2 is manually pressed, or controls the switch circuit 100 to turn on when a certain voltage drop is detected between the first terminal and the second terminal of the vehicle load. It can be understood that only when the first voltage does not meet the first preset condition, the second voltage is a forward voltage, and the resistance value of the equivalent resistance RL corresponding to the vehicle load is within the normal range, can the microprocessor MCU control the switch circuit 100 to be turned on based on the operation of the forced start switch K2.

[0071] Exemplarily, the forced start switch K2 can be implemented by a button, specifically connected to one of the pins of the microprocessor MCU. For example, when the voltage between the first and second terminals of the vehicle load drops from UC1 to UC2 ​​to generate a voltage drop value UCD (UCD=UC1-UC2), and the voltage drop value UCD is greater than or equal to the voltage drop threshold UC3 (usually in the range of 0.5V to 2V, with a typical value of 1V), it indicates that the voltage drop is caused by the ignition of the vehicle. To ensure the normal start of the vehicle, the microprocessor MCU needs to output a control signal within time T0 to turn on the switch circuit 100, so that the internal power supply BAT supplies power to the vehicle. Among them, the typical value of time T0 is less than 100ms. It can be understood that if the voltage drop value UCD is less than UC3, the switch circuit 100 is not turned on, which can prevent interference and misoperation.

[0072] In some other embodiments, the portable vehicle backup starting device 10 further includes a third voltage detection circuit 108. The third voltage detection circuit 108 is coupled to the switch circuit 100, the first electrode clamp, and the second electrode clamp. The third voltage detection circuit 108 is configured to detect a third voltage and / or voltage drop between the first terminal and the second terminal before the switch circuit 100 is turned on. The switch circuit 100 is turned off when the first voltage satisfies a first preset condition, the third voltage satisfies a fifth preset condition, or the voltage drop satisfies a sixth preset condition. The third voltage between the first terminal and the second terminal of the vehicle load can be acquired using, for example, a resistor divider or a voltage sensor.

[0073] When the third voltage is detected, the fifth preset condition can be set to: the third voltage is a forward voltage and is less than or equal to 9V, indicating insufficient vehicle load voltage. Alternatively, when a voltage drop is detected, the sixth preset condition can be set to: the voltage drop is less than 1V. It will be understood that when any of the following three conditions occurs: the first voltage satisfies the first preset condition, the third voltage satisfies the fifth preset condition, or the voltage drop between the first and second terminals satisfies the sixth preset condition, the switch circuit 100 is controlled to be non-conductive.

[0074] In one embodiment, as shown in FIG2 , the third voltage detection circuit 108 includes a first detection signal circuit 109, a sub-third voltage detection circuit 1081, and a microprocessor MCU. The first detection signal circuit 109 is coupled to the first electrode clamp or the second electrode clamp and is configured to provide a first signal to the first terminal and the second terminal before the switch circuit 100 is turned on. The sub-third voltage detection circuit 1081 is coupled to the first electrode clamp and the second electrode clamp and is configured to detect a third voltage and / or voltage drop between the first terminal and the second terminal based on the first signal before the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100 and the sub-third voltage detection circuit 1081 and controls the switch circuit 100 to be non-conductive when the first voltage satisfies a first preset condition, the third voltage satisfies a fifth preset condition, or the voltage drop satisfies a sixth preset condition. The first signal can be configured to assist in determining whether the first electrode clamp and the second electrode clamp have been properly connected to the vehicle load.

[0075] For example, as shown in FIG3 , the third voltage detection circuit 108 includes a first detection signal circuit 109 composed of a transistor Q4, a MOS transistor Q1, resistors R12, R11, R3, and a diode D3, a sub-third voltage detection circuit 1081 composed of resistors R4 and R8, and a microprocessor MCU. The specific detection process is as follows: first, the 11th pin of the microprocessor MCU outputs a low level to the first resistor detection circuit 111, turning off the MOS transistor Q1 in the first detection signal circuit 109. At this time, the 2nd pin of the microprocessor MCU reads the voltage value of the sub-third voltage detection circuit 1081 to calculate the voltage value UC1 of the vehicle load. When the voltage value UC1 is within a reasonable range (typical range of 1V to 15V), the microprocessor MCU determines that the electrode clip CLIP has been properly connected to the vehicle load. Next, the magnitude of the voltage value UC1 is judged again. If the voltage value UC1 is greater than the threshold value UC2 (UC2 range is 8 to 11V, typical value is 9V), at this time, the microprocessor MCU controls the switch circuit 100 to turn on when it detects that a certain voltage drop value has been generated between the first end and the second end of the vehicle load; if the voltage value UC1 is less than or equal to the threshold value UC2, it indicates that the vehicle load is in a low voltage state. In this state, the user needs to manually press the forced start switch K2 to make the portable vehicle backup starting device 10 enter the forced start mode. Furthermore, when voltage value UC1 is zero (e.g., no voltage value is read, indicating that the vehicle load is not present or not connected), pin 11 of the microprocessor MCU outputs a high level to the first detection signal circuit 109. At this point, MOS transistor Q1 in the first detection signal circuit 109 turns on, outputting a voltage value to the third voltage detection circuit 1081. Pin 2 of the microprocessor MCU then reads the voltage value output by the third voltage detection circuit 1081 and calculates the equivalent resistance RL corresponding to the externally connected vehicle load based on this voltage value. If the resistance of equivalent resistance RL is very low (e.g., close to 0Ω, with a typical value of RL being less than 1Ω), pin 12 of the microprocessor MCU controls the switch circuit 100 to be turned off. Conversely, if the resistance of equivalent resistance RL is within a normal range (e.g., greater than or equal to 1Ω), it is determined that the first and second electrode clamps are properly connected to the vehicle load. Pin 12 of the microprocessor MCU outputs a high level to control the switch circuit 100 to be turned on.

[0076] Of course, in some other embodiments, the first detection signal circuit 109 can be independent of the third voltage detection circuit 108 and exist in the portable vehicle standby starting device 10, so as to be configured to control whether the switch circuit 100 is conductive or non-conductive based on the second voltage and the first signal. Exemplarily, the portable vehicle standby starting device 10 further includes the first detection signal circuit 109, which is coupled to the switch circuit 100, the first electrode clamp, and the second electrode clamp, and is configured to provide a first signal to the first terminal and the second terminal before the switch circuit 100 is conductive. When the first voltage does not meet the first preset condition and the second voltage does not meet the second preset condition, the switch circuit 100 selectively connects the internal power supply BAT to the vehicle load based on the second voltage and the first signal.

[0077] For example, when the microprocessor MCU outputs a low-level first signal and the second voltage is within a reasonable range (typically 1V to 15V), the switch circuit 100 is controlled to conduct, connecting the internal power supply BAT to the vehicle load. When the second voltage is less than a set voltage threshold or is zero, the switch circuit 100 is initially turned off. After the first signal is output at a high level, the equivalent resistance of the vehicle load can be detected based on the second voltage read again, thereby determining whether the first and second electrode clamps are properly connected to the vehicle load, and thus controlling whether the switch circuit 100 needs to be turned on.

[0078] In one embodiment, as shown in FIG4 , the first detection signal circuit 109 includes a sub-first detection signal circuit 1091 and a microprocessor MCU. The sub-first detection signal circuit 1091 is coupled to the first electrode clamp and the second electrode clamp and is configured to provide a first signal to the first end and the second end before the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100 and the sub-first detection signal circuit 1091. When the first voltage does not meet the first preset condition and the second voltage does not meet the second preset condition, the microprocessor MCU controls whether the switch circuit 100 is turned on or off based on the second voltage and the first signal. For example, the sub-first detection signal circuit 1091 includes the transistor Q4, MOS transistor Q1, resistors R12, R11, R3, diode D3, etc., as shown in FIG3 .

[0079] In some other embodiments, the portable vehicle standby starting device 10 further includes a second time control circuit, a third voltage detection circuit 108 configured to detect a third voltage and a voltage drop between the first terminal and the second terminal before the switch circuit 100 is turned on, and the second time control circuit is coupled to the switch circuit 100. The second time control circuit is configured to start calculating a second time after the first voltage does not meet the first preset condition, the third voltage does not meet the fifth preset condition, and the voltage drop does not meet the sixth preset condition, and the switch circuit 100 is turned on when the second time meets the seventh preset condition. For example, the second time control circuit can be a microprocessor MCU, or a timing module, etc.

[0080] The seventh preset condition may be set to that the second time is less than or equal to 100 ms. It is understood that when it is determined that the internal power supply BAT voltage and the third voltage or voltage drop between the first terminal and the second terminal of the vehicle load meet the conduction condition, the switch circuit 100 is controlled to be turned on in a timely manner within the 100 ms time range.

[0081] As an alternative, unlike the above embodiment, the second time calculation starts at a different time. In some other embodiments, the portable vehicle backup starting device 10 further includes a second time control circuit coupled to the switch circuit 100. The second time control circuit is configured to begin calculating the second time after the first voltage fails to meet the first preset condition, and to turn on the switch circuit 100 when the second time meets the seventh preset condition. It will be understood that in this embodiment, the second time control circuit begins counting as soon as it determines that the internal power supply BAT is not experiencing a voltage shortage, thereby controlling the switch circuit 100 to promptly turn on within a certain period of time.

[0082] Considering that the output current of the portable vehicle standby starting device 10 may be too large after the switch circuit 100 is turned on, in order to protect the internal power supply BAT in time when the current is too large, the device also sets a current detection circuit to detect the current output by the internal power supply BAT.

[0083] In some other embodiments, the vehicle portable backup starting device 10 further includes a second current detection circuit 110, which is coupled to the first electrode or the second electrode and configured to detect a second current flowing through the second current detection circuit 110 after the switch circuit 100 is turned on. The switch circuit 100 is coupled to the second current detection circuit 110, and when the second current meets an eighth preset condition and the second current duration meets a ninth preset condition, the internal power supply BAT is disconnected from the vehicle load.

[0084] The eighth preset condition may be set as: the second current is greater than or equal to 300 A. The ninth preset condition may be set as: the second current duration is greater than 10 ms.

[0085] In one embodiment, the second current detection circuit 110 includes a sub-second current detection circuit 1101 and a microprocessor MCU. The sub-second current detection circuit 1101 is coupled to the first electrode or the second electrode and is configured to detect the second current flowing through the second current detection circuit 110 after the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100 and the sub-second current detection circuit 1101, and controls the switch circuit 100 to disconnect when the second current meets the eighth preset condition and the second current duration meets the ninth preset condition.

[0086] For example, as shown in FIG3 , the sub-second current detection circuit 1101 includes resistors R18 and R20, wherein pin 5 of the microprocessor MCU is connected to the series node between resistors R18 and R20. Optionally, pin 5 of the microprocessor MCU is also grounded via a capacitor C10. The operating process is as follows: pin 5 of the microprocessor MCU reads the voltage signal output by resistor R20 and further calculates the magnitude of the corresponding second current. Then, when the second current reaches a preset current threshold I2, the microprocessor MCU begins timing. After a time T3 has elapsed, pin 12 of the microprocessor MCU outputs a shutdown signal to the switch circuit 100 to shut down the output. For example, time T3 is typically 1s-120s, with a typical value of 5s. The current threshold I2 is typically 50A-200A, with a typical value of 100A.

[0087] In another embodiment, the second current detection circuit 110 includes a second current acquisition circuit 1102 and a second circuit 1103 (neither of which is shown in the figure), the second current acquisition circuit 1102 is coupled to the first electrode or the second electrode, and is configured to acquire the second current, and the second circuit 1103 is coupled to the second current acquisition circuit 1102 and the switching circuit 100, and is configured to determine whether the second current meets a fourth preset condition.

[0088] The second current acquisition circuit 1102 can adopt the structure of the sub-second current detection circuit 1101 shown in FIG3 , namely, including resistors R18 and R20. The second circuit 1103 can adopt the first circuit 1073 shown in FIG3 , namely, including transistor Q5, resistors R23 and R21, and a microprocessor MCU. Specifically, pin 10 of the microprocessor MCU is connected to transistor Q5 in the second circuit. When the second current reaches a current threshold I3 and is maintained for a certain time T2, pin 12 of the microprocessor MCU outputs a shutdown signal to the switch circuit 100 to shut down the output. The current threshold I3 is typically 400A-1000A, with a typical value of 500A. The time T2 is typically 10ms-1s, with a typical value of 300ms. It will be appreciated that the response time allowed by the second current can be longer than the response time allowed by the first current.

[0089] It is worth noting that, since the first circuit 1073 in the first current detection circuit 107 and the second circuit 1103 in the second current detection circuit 110 have the same structure, in actual application, it is preferred to implement the first current detection and the second current detection of the internal power supply BAT through time-sharing multiplexing of the circuits (i.e., sharing the same circuit).

[0090] Furthermore, due to certain component errors, this embodiment also calibrates the first current detection circuit 107 and / or the second current detection circuit 110 in the device. It is understood that by first disconnecting the loop where the first current detection circuit 107 and / or the second current detection circuit 110 resides and measuring the voltage as the zero point, and then obtaining the voltage value when the loop is connected, a calibrated voltage value is obtained by performing a difference process, thereby improving the accuracy of current measurement.

[0091] Taking the first current detection circuit 107 shown in FIG3 as an example, the microprocessor MCU calibrates the connected first current detection circuit 107 via pin 5 each time power is applied. The method is as follows: upon power application, pins 11 and 12 of the microprocessor MCU are both closed, so that the first current detection loop is in an open circuit state. Then, pin 5 of the microprocessor MCU reads the current voltage value UI0 across the current-sense resistor R25 and uses the voltage value UI0 as the zero point. Subsequently, when the switch circuit 100 is turned on to form a loop, current flows through the current-sense resistor R25 to generate a voltage value UI1. By subtracting the zero point value UI0, that is, dividing (UI1-UI0) by the resistance value of the current-sense resistor R25, the actual current value Io can be calculated.

[0092] In some other embodiments, the portable vehicle jump starter 10 exemplarily further includes a first resistance detection circuit 111 coupled to the switch circuit 100, the first electrode clamp, and the second electrode clamp. The first resistance detection circuit 111 is configured to detect the resistance of the vehicle load before the switch circuit 100 is turned on. The switch circuit 100 is turned off when the first voltage satisfies a first preset condition or the resistance satisfies a tenth preset condition. The tenth preset condition is that the resistance is less than 1Ω.

[0093] In one embodiment, as shown in FIG2 , the first resistance detection circuit 111 includes a sub-first resistance detection circuit 1111 and a microprocessor MCU. The sub-first resistance detection circuit 1111 is coupled to the first electrode clamp and the second electrode clamp, and is configured to detect the resistance value of the vehicle load before the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100 and the sub-first resistance detection circuit 1111. When the first voltage meets the first preset condition or the resistance value meets the tenth preset condition, the switch circuit 100 is controlled to not be turned on. It can be understood that the microprocessor MCU here is mainly configured to obtain the resistance value of the vehicle load and perform conditional judgment to control the switch circuit 100. Of course, this function of the microprocessor MCU can also be implemented by discrete devices. This is only an achievable example.

[0094] For example, the first resistance detection circuit 111 can be implemented using the same structure as the third voltage detection circuit 108. The first resistance detection circuit 111 includes the transistor Q4, the MOS transistor Q1, the resistors R12, R11, and R3, the diode D3, the resistors R4 and R8, and the microprocessor MCU shown in FIG3 . In actual use, if the device already includes the third voltage detection circuit 108, the third voltage detection circuit 108 can be reused to detect the resistance value of the vehicle load without the need to additionally provide the first resistance detection circuit 111, thereby simplifying the circuit and reducing costs.

[0095] In some other embodiments, the vehicle portable backup starting device 10 also includes a second indication circuit 112, the first resistance detection circuit 111 includes a sub-first resistance detection circuit 1111 and a microprocessor MCU, the sub-first resistance detection circuit 1111 is coupled to the first electrode clamp and the second electrode clamp, and is configured to detect the resistance value of the vehicle load before the switching circuit 100 is turned on, the microprocessor MCU is coupled to the switching circuit 100, the sub-first resistance detection circuit 1111 and the second indication circuit 112, and the second indication circuit 112 emits a sound and / or generates light when the resistance value meets the tenth preset condition.

[0096] As shown in FIG3 , the second indication circuit 112 includes a light-emitting diode LED1 and a resistor R15. It can be seen that the microprocessor MCU obtains the resistance value of the equivalent resistor RL corresponding to the vehicle load. If the resistance value of the equivalent resistor RL is very low (close to 0Ω, with a typical value of less than 1Ω), the microprocessor MCU outputs a high level at pin 15, causing the light-emitting diode LED1 of the second indication circuit 112 to emit a green indication signal. Of course, it is understood that the light-emitting diode in the second indication circuit 112 is not limited to LED1. Furthermore, other light-emitting diodes can also be included. As shown in FIG3 , the microprocessor MCU is connected to a red light-emitting diode LED2 at pin 16. It should be understood that the green light-emitting diode LED1 connected to pin 15 is configured to indicate the status when the connection is correct; and the red light-emitting diode LED2 connected to pin 16 can be configured to indicate the status when the connection is incorrect. In addition, the color of the light-emitting diodes in this application is not limited to a single color. For example, some can be green, some can be yellow, purple, etc. In actual practice, users can use light-emitting diodes of different colors to indicate different states according to actual needs, which is not limited here.

[0097] As an optional solution, the vehicle portable backup starting device 10 also includes a second detection signal circuit 113 (not shown in the figure), which is coupled to the switch circuit 100, the first electrode clamp and the second electrode clamp, and is configured to provide a second signal to the first end and the second end before the switch circuit 100 is turned on. When the first voltage does not meet the first preset condition, the switch circuit 100 selectively connects the internal power supply BAT to the vehicle load based on the first voltage and the second signal.

[0098] In one embodiment, as shown in Figure 4, the second detection signal circuit 113 includes a sub-second detection signal circuit 1131 and a microprocessor MCU. The sub-second detection signal circuit 1131 is coupled to the first electrode clamp and the second electrode clamp, and is configured to provide a second signal to the first end and the second end before the switch circuit 100 is turned on. The microprocessor MCU is coupled to the switch circuit 100 and the sub-second detection signal circuit 1131. When the first voltage does not meet the first preset condition, the switch circuit 100 is controlled to be turned on or off based on the first voltage and the second signal.

[0099] As shown in Figure 5, the second detection signal circuit 113 includes a sub-second detection signal circuit 1131 formed by resistors R22, R26, R2, and R27, and a MOS transistor Q10, and a microprocessor MCU. The signal output from pin 6 of the microprocessor MCU controls the on and off state of the MOS transistor Q10, causing the MOS transistor Q10 to generate different voltage values ​​in different states, thereby providing a second signal. For example, when Q10 is off, it is configured to generate a first voltage value UH, and when Q10 is on, it generates a second voltage value UL. The microprocessor MCU then determines whether to turn on the switch circuit 100 based on the first voltage value UH and the second voltage value UL. It can be understood that the aforementioned second signal includes the two different states of the MOS transistor Q10: on and off.

[0100] In some other embodiments, when including the above-mentioned second detection signal circuit 113, as shown in Figure 4, the vehicle portable standby starting device 10 also includes a common detection circuit 120, including: a first detection circuit 121, a second detection circuit 122 and a third detection circuit 123, so as to be configured to specifically determine whether the switch circuit 100 is turned on by detecting voltages of different levels.

[0101] For example, as shown in Figure 5, the first detection circuit 121 includes resistors R12, R15, R5, R7, and R17, a Zener diode ZD3, and a capacitor C5, which are configured to detect a higher voltage. The second detection circuit 122 includes resistors R16 and R8, a capacitor C3, and a Zener diode ZD1, which are configured to detect a normal (such as 12V) voltage. The third detection circuit 123 includes resistors R3 and R9, a Zener diode ZD2, and a capacitor C4, which are configured to detect a low voltage, such as the voltage when the current reaches 1000A. Among them, the Zener diodes ZD1, ZD2, and ZD3 are all configured to clamp the voltage to prevent the voltage from being too high and damaging the microprocessor MCU.

[0102] Specifically, pin 6 of the microprocessor MCU outputs a low level, turning on the MOS transistor Q10 of the first detection circuit. Pins 9, 10, and 11 of the microprocessor MCU read the values ​​U1L, U2L, and U3L of the first to third detection circuits, respectively, to obtain the voltage value UL. UL is determined as follows: if U1L is within the range, UL = U1L. If U1L is within the range, U2L is read. If U2L is within the range, UL = U2L. If U2L is within the range, UL = U3L is read. Pin 6 of the microprocessor MCU outputs a high level, turning on the MOS transistor Q10. Pins 9, 10, and 11 of the microprocessor MCU read the values ​​U1H, U2H, and U3H of the three detection circuits, respectively, to obtain the voltage value UH. (The method for determining the value of UH is the same as for UL). When UH is approximately equal to the voltage of the internal power supply BAT and UL is approximately equal to 0V, it is judged that there is no load; when UH is approximately equal to the voltage of the internal power supply BAT and UL is approximately equal to UH, it is judged that the resistance value of the vehicle load before the switching circuit 100 is turned on is less than 1Ω; when UH is greater than the voltage of the internal power supply BAT and UL is greater than the voltage of the internal power supply BAT, it is judged that the first electrode clamp and the second electrode clamp are in the second connection state with the first end and the second end of the vehicle load.

[0103] In the present application, there are multiple solutions for implementing the switch circuit 100 in the portable vehicle backup starting device 10 .

[0104] For example, in a first embodiment, the switch circuit 100 includes a first drive switch, a second drive switch, and a first switch K1. The first drive switch is coupled to the first voltage detection circuit 101 and the first switch K1. The second drive switch is coupled to the second voltage detection circuit 102 and the first switch K1. The first switch K1 is coupled to the second electrode clamp. The first drive switch controls the first switch K1 to be non-conductive when the first voltage satisfies a first preset condition. The second drive switch controls the first switch K1 to be non-conductive when the second voltage satisfies a second preset condition. The first switch K1 is non-conductive when the first voltage satisfies the first preset condition or the second voltage satisfies the second preset condition. Exemplarily, the first switch K1 can be a relay, a MOS transistor, etc., and needs to be able to withstand a current of 50A to 1000A within 5 seconds.

[0105] As shown in Figure 9, the switch circuit 100 includes a MOS transistor Q7 as a first drive switch, a MOS transistor Q2 as a second drive switch, and a first switch K1. Furthermore, it includes necessary peripheral components, such as resistors R5, R9, R10, and a diode D2. One end of the first switch K1 is connected to the electrode clip CLIP, and the other end is configured to connect to the internal power supply BAT. MOS transistor Q2 is coupled to the first switch K1. The control end of MOS transistor Q7 and the input end of resistor R9 are respectively configured to receive corresponding control signals. For example, when the voltage of the internal power supply BAT is detected to be low, the first voltage detection circuit 101 can generate a control signal to the MOS transistor Q7 to control the first switch K1 to be non-conductive. Alternatively, when the voltage across the vehicle load is detected to be reverse voltage or forward voltage but the magnitude of the forward voltage does not meet the forward conduction requirement, the second voltage detection circuit 102 can generate a control signal to the MOS transistor Q2 to control the first switch K1 to be non-conductive. It can be understood that when the first voltage detection circuit 101 or the second voltage detection circuit 102 adopts a solution including a microprocessor, the corresponding control signal can be sent by the microprocessor MCU to the corresponding MOS transistor Q7 or MOS transistor Q2.

[0106] Optionally, in a second embodiment, the switching circuit 100 includes a first drive switch, a second drive switch, a third drive switch and a first switch K1, the third drive switch is coupled to the second voltage detection circuit 102 and the second drive switch, the second drive switch is coupled to the first switch K1, the first drive switch is coupled to the first voltage detection circuit 101 and the first switch K1, the first switch K1 is coupled to the second electrode clamp, the third drive switch controls the second drive switch to be non-conductive when the second voltage satisfies the second preset condition, the first drive switch is non-conductive when the first voltage satisfies the first preset condition, and the first switch K1 is non-conductive when the first voltage satisfies the first preset condition or the second voltage satisfies the second preset condition.

[0107] Based on Figure 9, the switching circuit 100 also includes a transistor Q3 and a transistor Q8 as a third drive switch, and the required resistors R13, R27, R14, and R28. As shown in Figure 3, when the second voltage detection circuit 102 detects that the output voltage on the second electrode clamp is lower than the reference voltage, it will output a high level, thereby controlling the first switch K1 to be non-conductive through the third drive switch.

[0108] Optionally, in a third embodiment, the switch circuit 100 includes a first drive switch and a first switch K1. The first drive switch is coupled to the first voltage detection circuit 101 and the first switch K1. The first switch K1 is coupled to the second electrode clamp. The first drive switch controls the first switch K1 to be non-conductive when the first voltage satisfies a first preset condition. It is understood that in this embodiment, the control signal of the first drive switch may be derived from, in addition to the first voltage detection circuit 101, one or more combinations of the second voltage detection circuit 102, the third voltage detection circuit 108, the first time control circuit, the first current detection circuit 107, the second current detection circuit 110, the first detection signal circuit 109, the second detection signal circuit 113, etc., depending on the actual circuit design of the device and is not limited here.

[0109] As shown in FIG5 , the switch circuit 100 includes a MOS transistor Q6 serving as a first drive switch, as well as peripheral components such as resistors R1, R31, and a diode D3. When the MOS transistor Q6 receives different control signals, it controls whether the first switch K1 is conductive or non-conductive. For example, when the first voltage detection circuit 101 detects a low voltage on the internal power supply BAT, the MOS transistor Q6 controls the first switch K1 to be non-conductive. The MOS transistor Q6 can also be implemented as a transistor, etc., and this is not limited here.

[0110] In some other embodiments, the portable vehicle backup starting device 10 exemplarily further includes a temperature detection circuit 114 coupled to the switch circuit 100 and configured to detect the temperature of the switch circuit 100. The switch circuit 100 is non-conductive when the first voltage satisfies a first preset condition or the temperature satisfies an eleventh preset condition. For example, the temperature detection circuit 114 includes a temperature sensor, and the switch circuit 100 includes a first switch K1, which is disposed near the first switch K1. The eleventh preset condition is that the temperature is greater than or equal to 70°C, and the temperature value TMP1 is typically between 60°C and 120°C, with a typical value of 90°C.

[0111] In another embodiment, as shown in Figure 2 or 4, the temperature detection circuit 114 includes a sub-temperature detection circuit 1141 and a microprocessor MCU. The sub-temperature detection circuit 1141 is configured to detect the temperature of the switching circuit 100. The microprocessor MCU is coupled to the switching circuit 100 and the sub-temperature detection circuit 1141. When the first voltage meets the first preset condition or the temperature meets the eleventh preset condition, the switching circuit 100 is controlled to be non-conductive.

[0112] For example, as shown in FIG3 , the resistor R7 and the thermistor NTC1 form a sub-temperature detection circuit 1141. The thermistor NTC1 is placed near the first switch K1. When the temperature is too high, the resistance of the thermistor NTC1 decreases. The temperature value is calculated by the voltage value at the third pin of the microprocessor MCU. When the temperature rises to the temperature threshold TMP1, the over-temperature protection action is triggered, that is, the pin 12 of the microprocessor MCU outputs a shutdown signal or does not output an open signal to control the switch circuit 100 to be disconnected or not conductive.

[0113] In the above-mentioned embodiments, various circuits may include a microprocessor MCU. In actual applications, a microprocessor MCU and the like may appear.

[0114] The vehicle portable backup starting device 10 of the present application can effectively control the start and stop operations of the device when an abnormality occurs in the circuit by performing various functions such as voltage value detection, current value detection, and vehicle load resistance detection on the internal power supply BAT side, thereby greatly increasing the safety of the present application.

[0115] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, program segment or a part of the code contains one or more executable instructions configured to implement the specified logical function. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or flowchart, and the combination of boxes in the structure diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0116] The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the scope of protection of the present application. Industrial Applicability

[0117] An embodiment of the present application provides a portable backup starting device for a vehicle. A first voltage detection circuit is coupled to a switch circuit, a first electrode, and a second electrode. The first voltage detection circuit is configured to detect a first voltage between the first electrode and the second electrode before the switch circuit is turned on. The switch circuit is turned off when the first voltage meets a first preset condition. This device can effectively address safety issues and other issues associated with vehicle starting in the prior art. For example, when the internal power supply voltage is insufficient, the device temporarily stops controlling the switch circuit to protect the internal power supply, providing improved practicality.

Claims

1. A portable backup starting device for a vehicle, characterized in that: include: internal power supply, switch circuit, first voltage detection circuit, first electrode clamp and second electrode clamp, The first electrode clamp and the second electrode clamp are configured to be connected to a first end and a second end of a vehicle load, The internal power supply has a first electrode and a second electrode, the first electrode is coupled to the first electrode clamp, and the second electrode is coupled to the switch circuit. The switch circuit is coupled to the second electrode clamp, The first voltage detection circuit is coupled to the switch circuit, the first electrode and the second electrode, and is configured to detect a first voltage between the first electrode and the second electrode before the switch circuit is turned on. The switch circuit is not turned on when the first voltage meets a first preset condition.

2. The portable backup starting device for a vehicle according to claim 1, characterized in that: N ternary lithium batteries or N lithium cobalt oxide batteries are connected in series between the first electrode and the second electrode, and the first preset condition is that the value of the first voltage is less than or equal to 3.2N.

3. The portable backup starting device for a vehicle according to claim 1 or 2, characterized in that: N lithium iron phosphate batteries are connected in series between the first electrode and the second electrode, and the first preset condition is that the value of the first voltage is less than or equal to 2.5N.

4. The portable backup starting device for a vehicle according to any one of claims 1 to 3, characterized in that: N supercapacitors are connected in series between the first electrode and the second electrode, and the first preset condition is that the value of the first voltage is less than or equal to 2N.

5. The portable backup starting device for a vehicle according to any one of claims 1 to 4, characterized in that: The first voltage detection circuit includes a sub-first voltage detection circuit and a microprocessor, The sub-first voltage detection circuit is coupled to the first electrode, the second electrode and the microprocessor, and is configured to detect the first voltage between the first electrode and the second electrode before the switch circuit is turned on. The microprocessor is coupled to the switch circuit, and controls the switch circuit to be non-conductive when the first voltage meets the first preset condition.

6. The portable backup starting device for a vehicle according to any one of claims 1 to 5, characterized in that: It also includes a second voltage detection circuit, which is coupled to the switching circuit, the first electrode clamp and the second electrode clamp, and is configured to detect a second voltage between the first end and the second end before the switching circuit is turned on. The switching circuit does not turn on when the first voltage meets the first preset condition or the second voltage meets the second preset condition.

7. The portable backup starting device for a vehicle according to claim 6, characterized in that: The second preset condition is that the second voltage is a reverse voltage.

8. The portable backup starting device for a vehicle according to claim 7, characterized in that: The absolute value of the reverse voltage is greater than or equal to 0.1V.

9. The portable backup starting device for a vehicle according to claim 6, characterized in that: The second preset condition is that the second voltage is a forward voltage, and the absolute value of the forward voltage is less than or equal to 9V.

10. The portable backup starting device for a vehicle according to claim 6, characterized in that: The second voltage detection circuit includes a sub-second voltage detection circuit and a microprocessor, The sub-second voltage detection circuit is coupled to the first electrode clamp, the second electrode clamp and the microprocessor, and is configured to detect the second voltage between the first end and the second end before the switch circuit is turned on. The microprocessor is coupled to the switch circuit, and controls the switch circuit to be non-conductive when the first voltage satisfies a first preset condition or the second voltage satisfies a second preset condition.

11. The portable backup starting device for a vehicle according to claim 6, characterized in that: The switch circuit includes a first drive switch, a second drive switch, and a first switch, wherein the first drive switch is coupled to the first voltage detection circuit and the first switch, the second drive switch is coupled to the second voltage detection circuit and the first switch, and the first switch is coupled to the second electrode clamp. The first drive switch controls the first switch to be non-conductive when the first voltage satisfies the first preset condition, and the second drive switch controls the first switch to be non-conductive when the second voltage satisfies the second preset condition. The first switch is non-conductive when the first voltage satisfies the first preset condition or the second voltage satisfies the second preset condition.

12. The portable backup starting device for a vehicle according to claim 6, characterized in that: The switch circuit further includes a first drive switch, a second drive switch, a third drive switch, and a first switch, wherein the third drive switch is coupled to the second voltage detection circuit and the second drive switch, the second drive switch is coupled to the first switch, the first drive switch is coupled to the first voltage detection circuit and the first switch, and the first switch is coupled to the second electrode clamp. The third drive switch controls the second drive switch to be non-conductive when the second voltage satisfies the second preset condition, the first drive switch to be non-conductive when the first voltage satisfies the first preset condition, and the first switch to be non-conductive when the first voltage satisfies the first preset condition or the second voltage satisfies the second preset condition.

13. The portable backup starting device for a vehicle according to any one of claims 1 to 12, characterized in that: The switch circuit includes a first drive switch and a first switch, wherein the first drive switch is coupled to the first voltage detection circuit and the first switch, and the first switch is coupled to the second electrode clamp. The first driving switch controls the first switch to be non-conductive when the first voltage meets the first preset condition.

14. The portable backup starting device for a vehicle according to any one of claims 1 to 13, characterized in that: The first time control circuit is coupled to the switch circuit. The first time control circuit is configured to start counting a first time after the internal power supply is connected to the vehicle load, and the switch circuit disconnects the internal power supply from the vehicle load when the first time satisfies a third preset condition.

15. The portable backup starting device for a vehicle according to claim 14, characterized in that: The third preset condition is that the first time is within the range of 10s-120s.

16. The portable backup starting device for a vehicle according to claim 14, characterized in that: The first time control circuit is a microprocessor.

17. The portable backup starting device for a vehicle according to any one of claims 1 to 16, characterized in that: The invention also includes a first current detection circuit, the first current detection circuit is coupled to the first electrode or the second electrode, and the first current detection circuit is configured to detect a first current flowing through the first current detection circuit after the switch circuit is turned on. The switch circuit is coupled to the first current detection circuit, and disconnects the internal power supply from the vehicle load when the first current meets a fourth preset condition.

18. The portable backup starting device for a vehicle according to claim 17, characterized in that: The fourth preset condition is that the first current is greater than or equal to 1000A.

19. The portable backup starting device for a vehicle according to claim 17, characterized in that: The first current detection circuit includes a sub-first current detection circuit and a microprocessor, The sub-first current detection circuit is coupled to the first electrode or the second electrode and is configured to detect a first current flowing through the first current detection circuit after the switch circuit is turned on. The microprocessor is coupled to the switch circuit and the sub-first current detection circuit, and controls the switch circuit to be disconnected when the first current meets the fourth preset condition.

20. The portable backup starting device for a vehicle according to any one of claims 1 to 19, characterized in that: The system further includes a voltage stabilizing circuit, which is coupled to the internal power supply and configured to supply power to the switch circuit and the first voltage detection circuit.

21. The portable backup starting device for a vehicle according to claim 20, characterized in that: The voltage provided by the voltage stabilizing circuit is in the range of 2.0V-6.0V.

22. The portable backup starting device for a vehicle according to claim 20, characterized in that: The first voltage maintaining circuit is coupled to the internal power supply and the voltage stabilizing circuit and is configured to prevent a sudden change in the input voltage of the voltage stabilizing circuit.

23. The portable backup starting device for a vehicle according to claim 22, characterized in that: The first voltage maintaining circuit includes a capacitor and a diode, wherein the cathode of the diode is coupled to the anode of the capacitor.

24. The portable backup starting device for a vehicle according to any one of claims 1 to 23, characterized in that: It also includes a third voltage detection circuit, which is coupled to the switching circuit, the first electrode clamp and the second electrode clamp, and is configured to detect a third voltage and / or voltage drop between the first end and the second end before the switching circuit is turned on. The switching circuit does not turn on when the first voltage meets the first preset condition, or the third voltage meets the fifth preset condition, or the voltage drop meets the sixth preset condition.

25. The portable backup starting device for a vehicle according to claim 24, characterized in that: The fifth preset condition is that the third voltage is a forward voltage and is less than or equal to 9V.

26. The portable backup starting device for a vehicle according to claim 24, characterized in that: The sixth preset condition is that the voltage drop is less than 1V.

27. The portable backup starting device for a vehicle according to claim 24, characterized in that: The third voltage detection circuit includes a sub-third voltage detection circuit and a microprocessor, The sub-third voltage detection circuit is coupled to the first electrode clamp and the second electrode clamp, and is configured to detect a third voltage and / or a voltage drop between the first end and the second end before the switch circuit is turned on. The microprocessor is coupled to the switch circuit and the sub-third voltage detection circuit, and controls the switch circuit to be non-conductive when the first voltage satisfies the first preset condition, or the third voltage satisfies the fifth preset condition, or the voltage drop satisfies the sixth preset condition.

28. The portable backup starting device for a vehicle according to claim 24, characterized in that: A second time control circuit is further included, wherein the third voltage detection circuit is configured to detect a third voltage and a voltage drop between the first terminal and the second terminal before the switch circuit is turned on. The second time control circuit is coupled to the switch circuit, and the second time control circuit is configured to start calculating the second time after the first voltage does not meet the first preset condition, the third voltage does not meet the fifth preset condition, and the voltage drop does not meet the sixth preset condition, and the switch circuit is turned on when the seventh preset condition is met during the second time.

29. The portable backup starting device for a vehicle according to claim 28, characterized in that: The seventh preset condition is that the second time is less than or equal to 100 ms.

30. The portable backup starting device for a vehicle according to claim 28, characterized in that: The second time control circuit is a microprocessor.

31. The portable backup starting device for a vehicle according to any one of claims 1 to 30, characterized in that: It also includes a second time control circuit, which is coupled to the switch circuit. The second time control circuit is configured to start calculating the second time after the first voltage does not meet the first preset condition, and the switch circuit is turned on when the second time meets the seventh preset condition.

32. The portable backup starting device for a vehicle according to any one of claims 1 to 31, characterized in that: The invention also includes a second voltage maintaining circuit, which is coupled to the internal power supply and the switching circuit and is configured to prevent a sudden change in the input voltage of the switching circuit.

33. The portable backup starting device for a vehicle according to claim 32, characterized in that: The second voltage maintaining circuit includes a resistor, a capacitor, and a diode, wherein the cathode of the diode is coupled to the anode of the capacitor.

34. The portable backup starting device for a vehicle according to any one of claims 1 to 33, characterized in that: The second current detection circuit is coupled to the first electrode or the second electrode and is configured to detect a second current flowing through the second current detection circuit after the switch circuit is turned on. The switch circuit is coupled to the second current detection circuit, and disconnects the internal power supply from the vehicle load when the second current meets an eighth preset condition and the second current duration meets a ninth preset condition.

35. The portable backup starting device for a vehicle according to claim 34, characterized in that: The eighth preset condition is that the second current is greater than or equal to 300 A, and the ninth preset condition is that the duration of the second current is greater than 10 ms.

36. The portable backup starting device for a vehicle according to claim 34, characterized in that: The second current detection circuit includes a sub-second current detection circuit and a microprocessor. The sub-second current detection circuit is coupled to the first electrode or the second electrode and is configured to detect a second current flowing through the second current detection circuit after the switch circuit is turned on. The microprocessor is coupled to the switch circuit and the sub-second current detection circuit, and controls the switch circuit to be disconnected when the second current satisfies an eighth preset condition and the second current duration satisfies a ninth preset condition.

37. The portable backup starting device for a vehicle according to any one of claims 1 to 36, characterized in that: It also includes a first resistance detection circuit, which is coupled to the switching circuit, the first electrode clamp and the second electrode clamp, and is configured to detect the resistance value of the vehicle load before the switching circuit is turned on. The switching circuit is not turned on when the first voltage meets the first preset condition or the resistance value meets the tenth preset condition.

38. The portable backup starting device for a vehicle according to claim 37, characterized in that: The tenth preset condition is that the resistance value is less than 1Ω.

39. The portable backup starting device for a vehicle according to claim 37, characterized in that: The first resistance detection circuit includes a sub-first resistance detection circuit and a microprocessor. The sub-first resistance detection circuit is coupled to the first electrode clamp and the second electrode clamp and is configured to detect the resistance value of the vehicle load before the switch circuit is turned on. The microprocessor is coupled to the switch circuit and the sub-first resistance detection circuit, and controls the switch circuit to be non-conductive when the first voltage satisfies a first preset condition or the resistance value satisfies a tenth preset condition.

40. The portable backup starting device for a vehicle according to claim 6, characterized in that: The invention also includes a first detection signal circuit, which is coupled to the switch circuit, the first electrode clamp and the second electrode clamp, and is configured to provide a first signal to the first end and the second end before the switch circuit is turned on. The switch circuit selectively connects the internal power source to the vehicle load based on the second voltage and the first signal when the first voltage does not satisfy the first preset condition and the second voltage does not satisfy the second preset condition.

41. The portable backup starting device for a vehicle according to claim 40, characterized in that: The first detection signal circuit includes a sub-first detection signal circuit and a microprocessor, The sub-first detection signal circuit is coupled to the first electrode clamp and the second electrode clamp, and is configured to provide a first signal to the first end and the second end before the switch circuit is turned on. The microprocessor is coupled to the switch circuit and the sub-first detection signal circuit. When the first voltage does not meet the first preset condition and the second voltage does not meet the second preset condition, the microprocessor controls the switch circuit to be conductive or non-conductive based on the second voltage and the first signal.

42. The portable backup starting device for a vehicle according to any one of claims 1 to 41, characterized in that: The invention also includes a second detection signal circuit, which is coupled to the switch circuit, the first electrode clamp and the second electrode clamp, and is configured to provide a second signal to the first end and the second end before the switch circuit is turned on. The switching circuit selectively connects the internal power source to the vehicle load based on the first voltage and the second signal when the first voltage does not satisfy the first preset condition.

43. The portable backup starting device for a vehicle according to claim 42, characterized in that: The second detection signal circuit includes a sub-second detection signal circuit and a microprocessor. The sub-second detection signal circuit is coupled to the first electrode clamp and the second electrode clamp and is configured to provide a second signal to the first end and the second end before the switch circuit is turned on. The microprocessor is coupled to the switch circuit and the sub-second detection signal circuit, and controls the switch circuit to be conductive or non-conductive based on the first voltage and the second signal when the first voltage does not meet the first preset condition.

44. The portable backup starting device for a vehicle according to any one of claims 1 to 43, characterized in that: It also includes a temperature detection circuit, which is coupled to the switch circuit and configured to detect the temperature of the switch circuit. The switch circuit does not conduct when the first voltage meets the first preset condition or the temperature meets the eleventh preset condition.

45. The portable backup starting device for a vehicle according to claim 44, characterized in that: The eleventh preset condition is that the temperature is greater than or equal to 70°C.

46. ​​The portable backup starting device for a vehicle according to claim 44, characterized in that: The temperature detection circuit includes a sub-temperature detection circuit and a microprocessor. The sub-temperature detection circuit is configured to detect the temperature of the switching circuit. The microprocessor is coupled to the switching circuit and the sub-temperature detection circuit. When the first voltage meets the first preset condition or the temperature meets the eleventh preset condition, the microprocessor controls the switching circuit to be non-conductive.

47. The portable backup starting device for a vehicle according to claim 44, characterized in that: The temperature detection circuit includes a temperature sensor, the switch circuit includes a first switch, and the temperature sensor is arranged near the first switch.

48. The portable backup starting device for a vehicle according to any one of claims 1 to 47, characterized in that: The first switch is a relay or a MOS tube.

49. The portable backup starting device for a vehicle according to claim 6, characterized in that: The invention also includes a forced start switch, the second voltage detection circuit includes a sub-second voltage detection circuit and a microprocessor, the sub-second voltage detection circuit is coupled to the first electrode clamp, the second electrode clamp and the microprocessor, and is configured to detect the second voltage between the first end and the second end before the switch circuit is turned on, The microprocessor is coupled to the switch circuit, the first voltage detection circuit and the forced start switch. The switch circuit is not conductive when the first voltage meets the first preset condition or the second voltage meets the second preset condition. When the forced start switch is pressed, the microprocessor controls the switch circuit to be conductive when the second voltage meets the second preset condition.

50. The portable backup starting device for a vehicle according to claim 6, characterized in that: It also includes a first indication circuit, which is coupled to the second voltage detection circuit and generates sound and / or light when the second voltage meets a second preset condition.

51. The portable backup starting device for a vehicle according to claim 37, characterized in that: It also includes a second indicating circuit, the first resistance detection circuit includes a sub-first resistance detection circuit and a microprocessor, The sub-first resistance detection circuit is coupled to the first electrode clamp and the second electrode clamp, and is configured to detect the resistance value of the vehicle load before the switch circuit is turned on. The microprocessor is coupled to the switch circuit, the sub-first resistance detection circuit and the second indication circuit. The second indication circuit emits a sound and / or generates a light when the resistance value meets a tenth preset condition.

52. The portable backup starting device for a vehicle according to claim 17, characterized in that: The first current detection circuit includes a first current acquisition circuit and a first circuit. The first current acquisition circuit is coupled to the first electrode or the second electrode and is configured to acquire the first current. The first circuit is coupled to the first current acquisition circuit and the switching circuit and is configured to determine whether the first current meets a fourth preset condition.

53. The portable backup starting device for a vehicle according to claim 34, characterized in that: The second current detection circuit includes a second current acquisition circuit and a second circuit. The second current acquisition circuit is coupled to the first electrode or the second electrode and is configured to acquire the second current. The second circuit is coupled to the second current acquisition circuit and the switching circuit and is configured to determine whether the second current meets a fourth preset condition.

54. The portable backup starting device for a vehicle according to claim 42, characterized in that: It also includes a common detection circuit, which is configured to specifically determine whether the switch circuit is turned on by detecting voltages of different levels.

55. The portable backup starting device for a vehicle according to claim 54, characterized in that: The common detection circuit includes a first detection circuit, a second detection circuit and a third detection circuit.

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