Power connection control circuit and power connection device

Abstract

The utility model relates to a power connection control circuit and a power connection device. The power connection control circuit comprises a switch module, a power supply detection module, an impedance detection module and a fault processing module. The switch module is used for being electrically connected to a loop where power supply equipment and electric equipment are located. The switch module has an on state and an off state. The power supply detection module is electrically connected between a positive electrode and a negative electrode of power supply equipment. A fault signal is generated when the output voltage of the power supply device exceeds a predetermined voltage range. The impedance detection module is electrically connected to the switch module. And when the resistance value of the electric equipment in the loop is within a preset impedance range, the impedance detection module triggers the switch module to be switched to a conducting state. The fault processing module is electrically connected to the switch module. And when the fault signal is received, the fault processing module triggers the switch module to be switched to the off state, so that the damage to the electric equipment caused by abnormal voltage is avoided, and the damage to the power supply equipment caused by the abnormity of the electric equipment is avoided.

Description

Technical Field

[0001] This application relates to the field of power supply equipment technology, and in particular to a jump-start control circuit and jump-start device. Background Technology

[0002] For electronic devices requiring high-power supplies, such as model airplanes, drones, energy storage power supplies, and emergency power supplies, the input current can reach hundreds or even thousands of amperes. When providing power to these devices, the power supply equipment operates under harsh conditions. It is generally unable to communicate with or control the electronic devices. Therefore, if either the power supply equipment or the electronic device malfunctions, it can easily affect the other, causing more serious malfunctions or dangers. Utility Model Content

[0003] Based on this, the present invention provides a jump-start control circuit and jump-start device that can solve or at least alleviate the above-mentioned technical problems.

[0004] This utility model provides a jump-start control circuit, including:

[0005] A switch module is used to electrically connect to the circuit of the power supply equipment and the power consumption equipment; the switch module has an on state and an off state.

[0006] A power supply detection module is electrically connected between the positive and negative terminals of the power supply device and generates a fault signal when the output voltage of the power supply device exceeds a predetermined voltage range.

[0007] An impedance detection module is electrically connected to the switching module; when the resistance of the electrical equipment in the circuit is within a predetermined impedance range, the impedance detection module triggers the switching module to switch to the on state; and

[0008] The fault handling module is electrically connected to the switch module; when a fault signal is received, the fault handling module triggers the switch module to switch to the off state.

[0009] The jump-start control circuit of this application forms an electrical circuit with both the power supply and the user equipment via a switching module. When the switching module is in the ON state, the circuits of the power supply and user equipment are connected, allowing the power supply to output current to the user equipment. When the switching module is in the OFF state, it cuts off the connection between the power supply and user equipment, interrupting current transfer. If the output voltage of the power supply exceeds a predetermined voltage range, the power supply detection module outputs a fault signal. Upon receiving the fault signal, the fault handling module triggers the switching module to the OFF state, thus preventing damage to the user equipment caused by abnormal voltage when the power supply's output voltage exceeds the predetermined range. Simultaneously, the impedance detection module determines whether a circuit has been formed between the user equipment and the power supply by judging the resistance value, and confirms the normal status of the user equipment. If the resistance of the user equipment in the circuit is within a predetermined impedance range, the impedance detection module triggers the switching module to the ON state, ensuring that the circuit of the power supply and user equipment automatically switches back to a closed state only when the user equipment is in good condition, preventing damage to the power supply due to equipment malfunction.

[0010] In one embodiment, the impedance detection module includes a first resistor branch, comparator U41, and comparator U42; the first resistor branch is electrically connected between the negative terminal of the power supply equipment and the negative terminal of the power consumption equipment; the middle node of the first resistor branch outputs a first feedback voltage to the inverting input terminal of the comparator U41; when the first feedback voltage is less than a first predetermined voltage value, the output terminal of the comparator U41 outputs a fault signal; one end of the first resistor branch outputs a second feedback voltage to the non-inverting input terminal of the comparator U42; when the second feedback voltage is greater than a second predetermined voltage value, the output terminal of the comparator U42 triggers the switching module to switch to the on state.

[0011] In one embodiment, the switching module includes a relay RLY, a switch Q1, and a second resistor branch; the relay RLY has a coil and a pair of normally open contacts; the switch Q1 has a control terminal and two current-carrying terminals; one end of the coil is electrically connected to one current-carrying terminal of the switch Q1, and the other end of the coil is used to electrically connect to the positive terminal of the power supply device, and the other current-carrying terminal of the switch Q1 is used to electrically connect to the negative terminal of the power supply device; one end of the second resistor branch is electrically connected to one current-carrying terminal of the switch Q1, and the other end of the second resistor branch is used to electrically connect to the positive terminal of the power supply device; when the resistance of the electrical device in the circuit is within a predetermined impedance range, the impedance detection module triggers the switch Q1 to conduct; one contact of the pair of normally open contacts is used to electrically connect to the negative terminal of the power supply device, and the other contact is used to electrically connect to the negative terminal of the electrical device.

[0012] In one embodiment, the system further includes a disconnection fault detection module electrically connected to the fault handling module and a load docking terminal; the disconnection fault detection module is also electrically connected to a current-carrying terminal of the switch Q1; when the switch Q1 is disconnected and the potential of the load docking terminal relative to the negative terminal of the power supply device is less than a third predetermined voltage value, the disconnection fault detection module outputs a fault signal.

[0013] In one embodiment, the system further includes a light indicator module and an audible alarm module that are electrically connected to the fault handling module respectively; when the fault signal is received, the fault handling module also triggers the light indicator module to generate an alarm light and triggers the audible alarm module to generate an alarm sound.

[0014] In one embodiment, a reverse current detection module is further included; the reverse current detection module is electrically connected between the negative terminal of the power supply device and a load docking terminal; when the potential of the load docking terminal is greater than the potential of the negative terminal of the power supply device, the reverse current detection module generates a fault signal.

[0015] In one embodiment, a delay module electrically connected to the switching module is further included; the delay module periodically interrupts the impedance detection module's control of the switching module and triggers the switching module to switch to an off state.

[0016] In one embodiment, the delay module has a button K1; when the button K1 is triggered, the delay module triggers the switch module to switch to the on state.

[0017] In one embodiment, a forward current detection module is further included; the forward current detection module is electrically connected between the negative terminal of the power supply device and the negative terminal of the power consumption device; when the potential of the negative terminal of the power consumption device relative to the negative terminal of the power supply device is greater than a fourth predetermined voltage value, the forward current detection module outputs a power-on signal; upon receiving the power-on signal, the delay module stops interrupting the impedance detection module and stops triggering the switch module.

[0018] This utility model provides a jump-start device, including the jump-start control circuit of any of the above embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a jump-start device according to an embodiment of this application.

[0020] Figure 2a for Figure 1 The diagram shows the structure of the switch module in the jump-start control circuit.

[0021] Figure 2b for Figure 1 The diagram shows the structure of the power supply detection module in the power-on control circuit.

[0022] Figure 3 for Figure 1 The diagram shows the structure of the impedance detection module in the jump-start control circuit.

[0023] Figure 4a for Figure 1 The diagram shows the structure of the fault handling module in the jump-start control circuit.

[0024] Figure 4b for Figure 1 The diagram shows the structure of the disconnection fault detection module in the jump-start control circuit.

[0025] Figure 5a This is a schematic diagram of the structure of the light indicator module in the power-on control circuit of one embodiment of this application.

[0026] Figure 5b This is a schematic diagram of the structure of the sound warning module in the power-on control circuit of one embodiment of this application.

[0027] Figure 6a This is a schematic diagram of the reverse current detection module in a jump-start control circuit according to an embodiment of this application.

[0028] Figure 6b This is a schematic diagram of the delay module in a power-on control circuit according to an embodiment of this application.

[0029] Figure 7a This is a schematic diagram of the forward current detection module in a power-on control circuit according to an embodiment of this application.

[0030] Figure 7b This is a schematic diagram of the reference source module in the power-on control circuit of one embodiment of this application.

[0031] Figure 8a This is a schematic diagram of the high-temperature detection module in the power-on control circuit of one embodiment of this application.

[0032] Figure 8b This is a schematic diagram of the low-temperature detection module in the power-on control circuit of one embodiment of this application.

[0033] Reference numerals: 100, jump-start device; 20, jump-start control circuit; 21, switch module; 22, power supply detection module; 23, impedance detection module; 231, reverse current detection module; 24, fault handling module; 241, light indicator module; 242, sound alarm module; 25, disconnection fault detection module; 26, delay module; 261, forward current detection module; 27, reference source module; 28, high temperature detection module; 29, low temperature detection module; 400, power supply equipment; 500, electrical equipment. Detailed Implementation

[0034] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] The technical solutions provided by the embodiments of this application are described below with reference to the accompanying drawings.

[0038] Combination Figure 1As shown, this application provides a jump-start device 100. The jump-start device 100 is used to electrically connect a power supply device 400 and a power user device 500. The output voltage or output current of the power supply device 400 is transmitted to the power user device 500 via the jump-start device 100. Specifically, the jump-start device 100 forms a circuit with both the power supply device 400 and the power user device 500, and the jump-start device 100 can control the on / off state of this circuit, thereby stopping or starting the current transmission between the power supply device 400 and the power user device 500.

[0039] Optionally, the power supply device 400 can be a car emergency power supply or an energy storage power supply. Optionally, the power consumption device 500 can be a car battery or a drone.

[0040] Specifically, the jump-start device 100 includes a jump-start control circuit 20, a power supply connection terminal B+, a power supply connection terminal B-, a load connection terminal P+, and a load connection terminal P-. Specifically, the power supply connection terminal B+ is used to electrically connect to the positive terminal of the power supply equipment 400, and the power supply connection terminal B- is used to electrically connect to the negative terminal of the power supply equipment 400. The load connection terminal P+ is used to electrically connect to the positive terminal of the electrical equipment 500, and the load connection terminal P- is used to electrically connect to the negative terminal of the electrical equipment 500.

[0041] Optionally, one or more of the power supply terminal B+, power supply terminal B-, load terminal P+, and load terminal P- may employ a clip-type mechanical structure. Optionally, the power supply terminal B+ and power supply terminal B- may be two conductive structures of the same connector. Optionally, the load terminal P+ and load terminal P- may be two conductive structures of the same connector.

[0042] In some embodiments, the power supply terminal B+ is electrically connected to the load terminal P+, and the power-off control circuit 20 is electrically connected between the load terminal P+ and the load terminal P-. The power-off control circuit 20 can control the on / off state between the load terminal P+ and the load terminal P-, thereby stopping or starting the current transfer between the power supply device 400 and the power consumption device 500.

[0043] This application also provides a jump-start control circuit 20, including: a switch module 21, a power supply detection module 22, an impedance detection module 23, and a fault handling module 24. The switch module 21 is electrically connected to the circuit containing the power supply device 400 and the user device 500. The switch module 21 has an on state and an off state. The power supply detection module 22 is electrically connected between the positive and negative terminals of the power supply device 400. A fault signal is generated when the output voltage of the power supply device 400 exceeds a predetermined voltage range. The impedance detection module 23 is electrically connected to the switch module 21. When the resistance of the user device 500 in the circuit is within a predetermined impedance range, the impedance detection module 23 triggers the switch module 21 to switch to the on state. The fault handling module 24 is electrically connected to the switch module 21. Upon receiving a fault signal, the fault handling module 24 triggers the switch module 21 to switch to the off state.

[0044] The power-on control circuit 20 of this application forms an electrical circuit with the power supply device 400 and the power consumption device 500 through the switch module 21. When the switch module 21 is in the ON state, the circuits of the power supply device 400 and the power consumption device 500 are connected, allowing the power supply device 400 to output current to the power consumption device 500. When the switch module 21 is in the OFF state, it cuts off the connection between the power supply device 400 and the power consumption device 500, interrupting the current transfer between them. If the output voltage of the power supply device 400 exceeds a predetermined voltage range, the power supply detection module 22 outputs a fault signal. Upon receiving the fault signal, the fault handling module 24 triggers the switch module 21 to switch to the OFF state, thus preventing damage to the power consumption device 500 caused by abnormal voltage when the output voltage of the power supply device 400 exceeds the predetermined voltage range. Simultaneously, the impedance detection module 23 determines whether a circuit has been formed between the power consumption device 500 and the power supply device 400 by judging the resistance value, and confirms whether the state of the power consumption device 500 is normal. When the resistance of the electrical equipment 500 in the circuit is within the predetermined impedance range, the impedance detection module 23 triggers the switch module 21 to switch to the conducting state. Thus, when the electrical equipment 500 is in good condition, the circuit containing the power supply equipment 400 and the electrical equipment 500 is automatically switched to the open circuit, avoiding damage to the power supply equipment 400 due to abnormality of the electrical equipment.

[0045] In some implementations, combined Figure 7a As shown, the power-on control circuit 20 also includes a reference source module 27. The reference source module 27 provides one or more different reference voltages. Optionally, the reference source module 27 has multiple reference voltage points that each provide a different reference voltage. Specifically, the reference source module 27 has reference voltage point VREF1 and reference voltage point VREF2.

[0046] Specifically, the reference source module 27 includes diode D8, resistors R2, R3, and R5, chip U6, resistor R9, and resistor R13. The reference source module 27 is powered by the power supply terminal B+. Specifically, the anode of diode D8 is electrically connected to the power supply terminal B+. One end of resistor R2 is connected to the cathode of diode D8. The other end of resistor R2, one end of resistor R3, one end of resistor R9, the cathode of chip U6, and one end of resistor R9 are connected together, serving as the reference voltage point VREF2. The other end of resistor R3, one end of resistor R5, and the adjustment terminal of chip U6 are connected together; by setting the resistance ratio between resistors R3 and R5, the output voltage of the reference voltage point VREF2 can be set. The other end of resistor R9 is connected to one end of resistor R13, serving as the reference voltage point VREF1. The other end of resistor R5, the anode of chip U6, and the other end of resistor R13 are respectively electrically connected to the power supply terminal B-.

[0047] Optionally, the reference source module 27 also includes at least one of capacitors C6 and C10. Capacitor C6 or C10 is a filter capacitor. One end of capacitor C6 is electrically connected to the cathode of diode D8, and the other end is electrically connected to the power supply terminal B-. One end of capacitor C10 is electrically connected to the cathode of chip U6, and the other end is electrically connected to the power supply terminal B-.

[0048] Understandably, resistors R9 and R13 form a voltage divider circuit to divide the second reference voltage at reference voltage point VREF2, thereby outputting the first reference voltage at reference voltage point VREF1 for use by related circuits.

[0049] For example, the reference voltage point VREF2 is set to 5V, and the reference voltage point VREF1 is set to 2.5V. Alternatively, the magnitude of the first reference voltage or the second reference voltage can be changed by adjusting the resistance values ​​of resistors R3, R5, R9, and R13.

[0050] For example, chip U6 can be a programmable precision voltage reference source chip or a programmable LDO device.

[0051] Specifically, in combination Figure 2a As shown, the switch module 21 has an on signal terminal KR_ON electrically connected to the impedance detection module 23. The impedance detection module 23 triggers the switch module 21 through the on signal terminal KR_ON.

[0052] Specifically, the impedance detection module 23 can send an on signal and an off signal to the switch module 21. When the on signal terminal KR_ON receives the on signal, the switch module 21 switches to the on state, short-circuiting the load terminal P+ and the load terminal P-. After the on signal terminal KR_ON receives the off signal, the switch module 21 switches to the off state, creating an open circuit between the load terminal P+ and the load terminal P-.

[0053] Optionally, the signal form of the turn-on signal is high level. The signal form of the turn-off signal is low level.

[0054] In some embodiments, the switching module 21 includes a relay RLY, a switch Q1, and a second resistor branch. The relay RLY has a coil and a pair of normally open contacts. The switch Q1 has a control terminal and two current-carrying terminals. One end of the coil is electrically connected to one current-carrying terminal of the switch Q1, and the other end of the coil is used to electrically connect to the positive terminal of the power supply device 400. The other current-carrying terminal of the switch Q1 is used to electrically connect to the negative terminal of the power supply device 400. One end of the second resistor branch is electrically connected to one current-carrying terminal of the switch Q1, and the other end of the second resistor branch is used to electrically connect to the positive terminal of the power supply device 400. When the resistance of the electrical device 500 in the circuit is within a predetermined impedance range, the impedance detection module 23 triggers the switch Q1 to conduct. One contact of the pair of normally open contacts is used to electrically connect to the negative terminal of the power supply device 400, and the other contact is used to electrically connect to the negative terminal of the electrical device 500.

[0055] Understandably, when the connection signal terminal KR_ON receives the connection signal, the two current-carrying terminals of the switch Q1 are connected under the action of the connection signal, creating a potential difference between the two ends of the coil and allowing current to flow. The magnetic force generated by the energized coil causes a pair of normally open contacts to close, thereby short-circuiting the negative terminal of the power supply device 400 and the negative terminal of the power consumption device 500, thus forming a circuit in the circuit containing the power supply device 400 and the power consumption device 500.

[0056] Optionally, one of the contacts is electrically connected to the negative terminal of the power supply device 400 via the power supply terminal B-, and the other contact is electrically connected to the negative terminal of the power consumption device 500 via the load terminal P-.

[0057] Optionally, one current-carrying terminal of the switching element Q1 is used as a signal terminal SW, which can provide feedback on whether the coil is energized.

[0058] For example, the relay RLY is a single-pole single-throw normally open relay. For example, the second resistor branch includes resistors R25 and R28. Resistors R25 and R28 are connected in series between the power supply terminal B+ and a current-carrying terminal of the switch Q1.

[0059] Optionally, the switching module 21 further includes resistors R1, R4, R75, capacitor C4, diodes D1 and D2, and a switching element Q4 to improve the stability of the switching module 21. Exemplarily, switching elements Q1 and Q4 are MOSFETs, transistors, or small relays.

[0060] In some implementations, combined Figure 4b As shown, the power-off control circuit 20 also includes a disconnection fault detection module 25 electrically connected to the fault handling module 24. The disconnection fault detection module 25 is also electrically connected to a current-carrying terminal of the switch Q1 and the load terminal P-. When the switch Q1 is open and the potential of the load terminal P- relative to the negative terminal of the power supply device 400 is less than a third predetermined voltage value, the disconnection fault detection module 25 outputs a fault signal. Understandably, if there is no potential at the load terminal P- relative to the negative terminal of the power supply device 400, and the coil is not energized, it indicates that either the load terminal P+ or the load terminal P- may not have made conductive contact with the electrical device 500. By outputting a fault signal, the disconnection fault detection module 25 prevents the switch module 21 from switching to the on state, thus preventing the output voltage of the power supply device 400 from being transmitted between the load terminals P+ and P-.

[0061] Specifically, the disconnect fault detection module 25 includes a comparator U22, resistors R52, R57, R58, and R39, a diode D4, and a capacitor C5. One end of resistor R52 is electrically connected to the load terminal P-. The other end of resistor R52 is electrically connected to the inverting input of comparator U22. One end of resistor R57 is electrically connected to the reference voltage point VREF2, and the other end of resistor R57 is electrically connected to the non-inverting input of comparator U22 and one end of resistor R58. One end of resistor R39 is electrically connected to the output of comparator U22, and the other end of resistor R39 serves as the fault signal terminal ZL_ERR, electrically connected to the fault processing module 24 and used to output a fault signal. The other end of resistor R39 is also electrically connected to the anode of diode D4 and one end of capacitor C5. The cathode of diode D4 is electrically connected to the signal terminal SW of switch module 21. The other ends of resistor R58 and capacitor C5 are respectively electrically connected to the power supply terminal B-.

[0062] Optionally, comparator U22 is powered by power supply device 400. Specifically, resistors R57 and R58 divide the reference voltage point VREF2, and the divided voltage signal relative to the power supply terminal B- is input to the non-inverting input of comparator U22. The inverting input of comparator U22 obtains the voltage of the load terminal P- through resistor R52. When the voltage at the inverting input of comparator U22 is less than the voltage at its non-inverting input, the output of comparator U22 outputs a high-level signal through resistor R39.

[0063] Furthermore, when comparator U22 outputs a high-level signal, if the signal terminal SW is in a high-level signal state, the fault signal output terminal ZL_ERR outputs a fault signal, thereby triggering the alarm state of the fault handling module 24. If the signal terminal SW is in a low-level signal state, the fault signal output terminal ZL_ERR outputs a low-level signal, indicating that the circuit detection is normal.

[0064] In some implementations, combined Figure 4a As shown, the fault handling module 24 includes resistors R85, R84, R50, R46, R99, R41, R29, R53, and a switch Q3. Resistors R85, R84, R50, R46, R99, R41, and R29 each receive a fault signal at one end and are electrically connected to the control terminal of switch Q3 at the other end. Resistor R53 is electrically connected between the power supply terminal B+ and one current-carrying terminal of switch Q3, and the other current-carrying terminal of switch Q3 is electrically connected to the power supply terminal B-. One current-carrying terminal of switch Q3 is also electrically connected to the ON signal terminal KR_ON of switch module 21.

[0065] Specifically, upon receiving a fault signal, the fault signal acts on the control terminal of the switch Q3, causing the two current-carrying terminals of the switch Q3 to conduct. One current-carrying terminal of the switch Q3 outputs a low level to the turn-on signal terminal KR_ON of the switch module 21, thereby switching the switch module 21 to the off state.

[0066] In some implementations, combined Figure 5a and Figure 5b As shown, the power-off control circuit 20 also includes a light indicator module 241 and an audible alarm module 242, which are electrically connected to the fault handling module 24, respectively. When a fault signal is received, the fault handling module 24 also triggers the light indicator module 241 to generate an alarm indicator light and triggers the audible alarm module 242 to generate an alarm alarm sound.

[0067] Specifically, in combination Figure 5aAs shown, the lighting indicator module 241 includes indicator LED2 and indicator LED1. Upon receiving a fault signal, the fault handling module 24 triggers the lighting indicator module 241, causing indicator LED2 to turn off and indicator LED1 to light up. Further, the lighting indicator module 241 also includes diodes D7, D14, R60, and switches Q10 and Q12. Understandably, after the two current-carrying terminals of switch Q3 are connected, diode D7 connects the control terminal of switch Q10 to the power supply terminal B-, triggering the disconnection between the two current-carrying terminals of switch Q10, thereby turning off indicator LED2. Simultaneously, diodes D14 and R60 directly illuminate indicator LED1, no longer controlled by switch Q12.

[0068] Specifically, in combination Figure 5b As shown, the sound alarm module 242 includes a buzzer BEE1. Upon receiving a fault signal, the fault processing module 24 triggers the sound alarm module 242, causing the buzzer BEE1 to sound. Furthermore, the sound alarm module 242 also includes resistors R19, R70, R71, and R72, a capacitor C2, and switches Q8, Q9, and Q11.

[0069] Specifically, resistor R71 is electrically connected between the control terminal of switch Q11 and one current-carrying terminal of switch Q3. One current-carrying terminal of switch Q11 is electrically connected to the power supply terminal B-. When the fault handling module 24 triggers the control terminal of switch Q11, it disconnects the two current-carrying terminals of switch Q11, allowing the PWM signal to be input to the control terminal of switch Q9 through resistors R19 and R72, generating a PWM pulse on one current-carrying terminal of switch Q9. Simultaneously, the pulse signal is input to the control terminal of switch Q8 through capacitor C2 and resistor R70, causing a PWM pulse that is opposite in phase and has the same frequency as the current-carrying terminal of switch Q9 to be generated on one current-carrying terminal of switch Q8, thereby causing the buzzer to sound.

[0070] In some implementations, combined Figure 3 As shown, the impedance detection module 23 includes a first resistor branch, comparator U41, and comparator U42. The first resistor branch is electrically connected between the negative terminal of the power supply device 400 and the negative terminal of the power consumption device 500. The middle node of the first resistor branch outputs a first feedback voltage to the inverting input terminal of comparator U41. When the first feedback voltage is less than a first predetermined voltage value, the output terminal of comparator U41 outputs a fault signal. One end of the first resistor branch outputs a second feedback voltage to the non-inverting input terminal of comparator U42. When the second feedback voltage is greater than a second predetermined voltage value, the output terminal of comparator U42 triggers the switching module 21 to switch to the on state.

[0071] Understandably, the electrical device 500 can be regarded as an impedance element. When the first resistor branch is connected in series with the electrical device 500 between the positive and negative terminals of the power supply device 400, and the first resistor branch is electrically connected between the negative terminal of the power supply device 400 and the negative terminal of the electrical device 500, the potential difference between the two ends of the first resistor branch can reflect the resistance of the electrical device 500.

[0072] Understandably, when the first feedback voltage is less than the first predetermined voltage value, the resistance of the applied electrical equipment 500 is lower than the lower limit of the predetermined impedance range. At this time, the electrical equipment 500 may be malfunctioning, so the output of the comparator U41 outputs a fault signal to the fault handling module 24 to prevent the switching module 21 from switching to the on state.

[0073] For example, the first resistor branch includes resistors R44 and R45. One end of resistor R44 is electrically connected to the load terminal P-, and the other end of resistor R44 is electrically connected to one end of resistor R45. The other end of resistor R45 is electrically connected to the power supply terminal B-.

[0074] Specifically, in combination Figure 3 As shown, the impedance detection module 23 also includes resistors R40, R42, and R43. One end of resistor R42 is electrically connected to the power supply terminal B+, and the other ends of resistors R42 and R43 are respectively electrically connected to the non-inverting input of comparator U41. One end of resistor R40 is electrically connected to the other end of resistor R44, and the other end of resistor R40 is electrically connected to the inverting input of comparator U41. The output of comparator U41 serves as the fault signal terminal DL_ERR and is electrically connected to the fault handling module 24.

[0075] Understandably, when the voltage at the inverting input of comparator U41 is lower than the voltage at the non-inverting input, it is equivalent to the resistance of the electrical equipment 500 falling below the lower limit of a predetermined impedance range. The output of comparator U41 then outputs a high-level fault signal, triggering the fault handling module 24 to enter an alarm state and disabling the triggering effect of comparator U42 on the switching module 21. Understandably, in the alarm state, the fault handling module 24 at least triggers the switching module 21 to switch to the off state.

[0076] Optionally, the impedance detection module 23 further includes at least one of capacitors C43 and C44. Capacitor C43 or capacitor C44 is a filter capacitor. Capacitor C43 is electrically connected between the non-inverting input terminal of comparator U41 and the power supply terminal B-. Capacitor C44 is electrically connected between one end of resistor R40 and the power supply terminal B-.

[0077] Specifically, the impedance detection module 23 also includes resistors R47, R48, R49, and R64. One end of resistor R47 is electrically connected to the load terminal P-, and the other end of resistor R47 is electrically connected to the non-inverting input of comparator U42. One end of resistor R48 is electrically connected to the reference voltage point VREF2. The other end of resistor R48 and one end of resistor R49 are electrically connected to the inverting input of comparator U42.

[0078] Optionally, the impedance detection module 23 further includes at least one of capacitors C42 and C41. Capacitor C42 or capacitor C41 is a filter capacitor. One end of capacitor C42 is electrically connected to the other end of resistor R47, and the other end of capacitor C42 is electrically connected to the power supply terminal B-. One end of capacitor C41 is electrically connected to the other end of resistor R48, and the other end of capacitor C41 is electrically connected to the power supply terminal B-.

[0079] Understandably, the higher the resistance of the electrical device 500, the lower the voltage at the non-inverting input of comparator U42. Understandably, when the voltage at the inverting input of comparator U42 is higher than the voltage at the non-inverting input, it is equivalent to the resistance of the electrical device 500 being higher than the upper limit of a predetermined impedance range. In this case, comparator U42 outputs a low-level signal, triggering switch module 21 to switch to the off state. When the voltage at the inverting input of comparator U42 is lower than the voltage at the non-inverting input, the resistance of the electrical device 500 is lower than the upper limit of a predetermined impedance range. In this case, comparator U42 outputs a high-level signal, triggering switch module 21 to switch to the on state.

[0080] For example, the lower limit of the predetermined impedance range is set to 3Ω; the upper limit of the predetermined impedance range is set to 20KΩ. Optionally, the upper or lower limit resistance can be adjusted by adjusting the values ​​of resistors R42, R43, R44, and R45. Understandably, any one or more of resistors R42, R43, R44, and R45 can be the equivalent resistance of multiple resistors connected in series and parallel.

[0081] Alternatively, comparators U41 and U42 are directly powered by the power supply device 400.

[0082] Furthermore, the impedance detection module 23 also includes a switch Q7, a resistor R66, a diode D11, a resistor R65, and a capacitor C15.

[0083] Specifically, capacitor C15 is a signal coupling capacitor. The output of comparator U42 is electrically connected to one end of resistor R64 and one current-carrying end of switch Q7. The other current-carrying end of switch Q7 is electrically connected to one end of resistor R66. The other end of resistor R66 is electrically connected to the anode of diode D11. The on signal terminal KR_ON is electrically connected to the other end of resistor R64 and the cathode of diode D11. One end of capacitor C15 is electrically connected to the signal terminal SW. The other end of capacitor C15 is electrically connected to the control terminal of switch Q7 and one end of resistor R65. The load-on-line circuit is used to output the output of comparator U42 to the on signal terminal KR_ON through resistor R66 when the signal at SW changes.

[0084] Understandably, when the voltage between the positive and negative terminals of the electrical device 500 is greater than the output voltage of the power supply device 400, the current in the circuit will flow from the positive terminal of the power supply device 400 to the negative terminal, forming a reverse current, which may damage the power supply device 400.

[0085] In some implementations, combined Figure 6a As shown, the power-off control circuit 20 also includes a reverse current detection module 231. The reverse current detection module 231 is electrically connected between the negative terminal of the power supply device 400 and the load connection terminal P-. When the potential of the load connection terminal P- is greater than the potential of the negative terminal of the power supply device 400, the reverse current detection module 231 generates a fault signal. Understandably, since the load connection terminal P- is electrically connected to the negative terminal of the electrical device 500, when a reverse current is generated, the potential of the load connection terminal P- is greater than the potential of the negative terminal of the power supply device 400. Triggered by the reverse current detection module, the fault handling module 24 triggers the switch module 21 to switch to the off state, thereby preventing damage to the power supply device 400.

[0086] Specifically, the reverse current detection module 231 includes resistors R30, R33, and R31, and comparator U32. One end of resistor R30 is electrically connected to the reference voltage point VREF2, and the other end of resistor R30 is electrically connected to one end of resistor R33 and the inverting input terminal of comparator U32. The other end of resistor R33 is electrically connected to the load terminal P-. One end of resistor R31 is electrically connected to the power supply terminal B-, and the other end of resistor R31 is electrically connected to the non-inverting input terminal of comparator U32. The output terminal of U32 serves as the fault signal terminal FC_ERR, and is electrically connected to the fault processing module 24 for outputting a fault signal. Optionally, comparator U32 is powered by the power supply device 400.

[0087] Understandably, when current flows from the negative terminal of power supply equipment 400 to the negative terminal of power consumption equipment 500, the potential of the load terminal P- is lower than that of the negative terminal of power supply equipment 400. Through resistor R33, the voltage between the load terminal P- and the negative terminal of power supply equipment 400 causes the voltage at the inverting input of comparator U32 to be less than or equal to the voltage at the non-inverting input of comparator U32, thereby triggering the output of comparator U32 to output a fault signal to fault processing module 24, causing fault processing module 24 to enter an alarm state.

[0088] Understandably, when the switch module 21 switches to the on state under the trigger of the impedance detection module 23, if the load docking terminals P+ and P- are disconnected from the positive and negative terminals of the power supply equipment 500, and if the output voltage of the power supply equipment 400 still exists, there is a risk of short circuit between the load docking terminals P+ and P-.

[0089] In some implementations, combined Figure 6b As shown, the power-on control circuit 20 also includes a delay module 26 electrically connected to the switch module 21. The delay module 26 periodically interrupts the impedance detection module 23's control of the switch module 21 and triggers the switch module 21 to switch to the off state. After the delay module 26 triggers the switch module 21 to switch to the off state, if the load terminals P+ and P- are still trying to connect to the electrical equipment, the impedance detection module 23 will re-trigger the switch module 21 to switch to the on state, allowing the circuit containing the power supply equipment 400 and the electrical equipment 500 to continue to maintain continuity. If the load terminals P+ and P- have actually disconnected from the positive and negative terminals of the electrical equipment 500, the switch module 21 will remain in the off state to prevent short-circuit discharge between the load terminals P+ and P-.

[0090] In some embodiments, the delay module 26 includes resistors R63 and R27, chip U5, and switch Q6. Chip U5 has several pins. Optionally, chip U5 integrates one or more of a first timer, a second timer, a third timer, and a fourth timer. Optionally, the timing period of the first timer is approximately 200 ms. The timing period of the second timer is approximately 1.5 seconds. The timing period of the third timer is approximately 3 seconds. The timing period of the fourth timer is approximately 30 seconds.

[0091] For example, the fourth pin of chip U5 is electrically connected to one end of resistor R27. The other end of resistor R27 is electrically connected to one end of resistor R63 and the control terminal of switch Q6. One current-carrying terminal of switch Q6 is electrically connected to the on signal terminal KR_ON of switch module 21, and the other current-carrying terminal of switch Q6 is electrically connected to the power supply terminal B- and the other end of resistor R63.

[0092] Specifically, the second timer has two timing states. The first state is that when chip U5 is powered on, the second timer starts timing. After the first timing overflow, pin 4 of chip U5 triggers switch Q6 to conduct, outputting a low-level pulse signal to signal terminal KR_ON. Afterward, the second timer automatically resets and restarts timing, returning to the initial timing state, looping infinitely until power is cut off. The second state is triggered by a low-level signal on pin 7 of chip U5. Optionally, the timing period of the second timer is 1.5 seconds; therefore, the delay module 26 will interrupt the impedance detection module 23 every 1.5 seconds.

[0093] In some implementations, the delay module 26 has a button K1. When the button K1 is triggered, the delay module 26 triggers the switch module 21 to switch to the ON state. Understandably, in some cases, when the resistance of the electrical equipment 500 is outside the predetermined impedance range, it may still be necessary to switch the switch module 21 to the ON state.

[0094] Specifically, the delay module 26 also includes a resistor R67. Pin 6 of chip U5 is electrically connected to one end of resistor R67; the other end of resistor R67 is electrically connected to one end of button K1, and the other end of button K1 is electrically connected to the power supply terminal B-. When pin 6 of chip U5 is connected to the power supply terminal B- via resistor R67 by button K1, the third timer is triggered to start counting. After the third timer overflows, the trigger chip U5 triggers the switch module 21 to switch to the ON state. Optionally, the counting period of the third timer is 3 seconds.

[0095] Furthermore, the switch module 21 is electrically connected to the ON signal terminal K1_ON of the delay module 26. The delay module 26 triggers the switch module 21 through the ON signal terminal K1_ON. More specifically, after the third timer overflows, the third pin of the trigger chip U5 outputs a high level to the signal terminal K1_ON. Further, the delay module 26 also includes a resistor R68 and a diode D3. The third pin of the chip U5 is connected to one end of the resistor R68, and the other end of the resistor R68 is electrically connected to the anode of the diode D3. The cathode of the diode D3 is electrically connected to the signal terminal K1_ON.

[0096] Furthermore, the delay module 26 also includes resistors R16 and R20, capacitor C19, and diode D5. One end of capacitor C19 is electrically connected to pin 1 of chip U5 and reference voltage point VREF2. The other end of capacitor C19 is electrically connected to power supply terminal B-. Specifically, reference voltage point VREF2 provides a high-precision reference voltage to the delay module 26. Capacitor C19 is a filter capacitor. Pin 2 of chip U5 is electrically connected to signal terminal LED_G. Pin 5 of chip U5 is connected to signal terminal LED_R. Pin 7 of chip U5 is electrically connected to one end of resistor R16 and one end of resistor R20. The other end of resistor R16 is electrically connected to reference voltage point VREF2. The other end of resistor R20 is electrically connected to the anode of diode D5. The cathode of diode D5 is electrically connected to signal terminal SW.

[0097] Specifically, when the reference voltage point VREF2 is powered on and chip U5 is powered on, the first timer starts counting. When the first timer overflows for the first time, it triggers pin 2 of chip U5 to output a high level to signal terminal LED_G, and pin 5 of chip U5 to output a low level to signal terminal LED_R. At the same time, the first timer is automatically reset and starts counting again from 0. When the first timer overflows for the second time, it triggers pin 2 of chip U5 to output a low level to signal terminal LED_G, and pin 5 of chip U5 to output a high level to signal terminal LED_R. At the same time, the first timer is automatically reset and starts counting again from 0, returning to the initial counting state. The counting of the first timer loops indefinitely until chip U5 is powered off.

[0098] Specifically, when signal terminal SW is at a low level, the trigger circuit of chip U5 causes pin 7 of chip U5 to receive a low-level signal, thereby triggering the fourth timer to start counting. After the fourth timer overflows, pin 4 of chip U5 will output a low-level signal to signal terminal KR_ON through switch Q6. At the same time, pin 3 of chip U5 outputs a low-level signal to signal terminal K1_ON.

[0099] Understandably, when current flows from the negative terminal of the electrical device 500 to the negative terminal of the power supply device 400, there is a positive current in the circuit containing both the power supply device 400 and the electrical device 500.

[0100] In some implementations, combined Figure 7aAs shown, the power-on control circuit 20 also includes a forward current detection module 261. The forward current detection module 261 is electrically connected between the negative terminal of the power supply device 400 and the negative terminal of the user device 500. When the potential of the negative terminal of the user device 500 relative to the negative terminal of the power supply device 400 is greater than a fourth predetermined voltage value, the forward current detection module 261 outputs a power-on signal. Upon receiving the power-on signal, the delay module 26 stops interrupting the impedance detection module 23 and stops triggering the switch module 21, thereby preventing the switch module 21 from switching from the on state to the off state when a positive current flows through it, thus avoiding interference with current transmission.

[0101] Specifically, the forward current detection module 261 includes resistor R55, capacitor C3, resistor R56, capacitor C53, resistor R21, resistor R22, comparator U23, resistor R38, resistor RB1, capacitor C7, switch Q5, resistor R15, resistor R23 and switch Q20.

[0102] Optionally, comparator U23 is directly powered by the power supply terminal. Capacitors C3, C53, and C7 are filter capacitors.

[0103] One end of resistor R55 is electrically connected to one end of capacitor C3 and the load terminal P-. The other end of capacitor C3 is electrically connected to the power supply terminal B-. The other end of resistor R55 is electrically connected to the non-inverting input of comparator U23.

[0104] One end of resistor R56 is electrically connected to one end of capacitor C53, one end of resistor R21, and one end of resistor R22. The other end of resistor R21 is electrically connected to the reference voltage point VREF2. The other end of resistor R56 is electrically connected to the inverting input of comparator U23. The other ends of capacitor C53 and resistor R22 are electrically connected to the power supply terminal B-.

[0105] The output of comparator U23 is electrically connected to one end of resistor R38. The other end of resistor R38 is electrically connected to one end of resistor R15 and one current-carrying terminal of switch Q5. The other end of resistor R15 is electrically connected to one end of resistor R23 and the control terminal of switch Q20. The other end of resistor R23 is electrically connected to one current-carrying terminal of switch Q20. Further, the other current-carrying terminal of switch Q20 serves as signal terminal Q6G. Specifically, signal terminal Q6G is electrically connected to the control terminal of switch Q6.

[0106] One end of resistor RB1 is electrically connected to the signal terminal SW. The other end of resistor RB1 is electrically connected to one end of capacitor C7 and the control terminal of switch Q5. The other end of capacitor C7 is electrically connected to the other current-carrying terminal of switch Q5 and the power supply terminal B.

[0107] When the non-inverting input of comparator U23 receives a voltage higher than the inverting input from the load terminal P-, it is equivalent to a positive current existing in the circuit containing power supply equipment 400 and power consumption equipment 500. At this time, the output of comparator U23 outputs a low level to signal terminal Q6G through switch Q20, thereby suppressing the triggering of the control terminal of switch Q6 by chip U5 and preventing switch module 21 from switching from the on state to the off state.

[0108] In some implementations, combined Figure 2b As shown, the power supply detection module 22 includes a comparator U11, resistors R10, R11, R12, and capacitor C12. One end of resistor R10 is electrically connected to the power supply terminal B+. The other end of resistor R10 is electrically connected to one end of resistor R12, one end of capacitor C12, and the non-inverting input of comparator U11. The other end of resistor R12 is electrically connected to the other end of capacitor C12 and the power supply terminal B-. The output of comparator U11 serves as the fault signal terminal VH_ERR and is electrically connected to the fault handling module 24. The inverting input of comparator U11 is electrically connected to one end of resistor R11; the other end of resistor R11 is electrically connected to the reference voltage point VREF1.

[0109] Understandably, a detection structure for the upper limit voltage of the power supply device 400 is formed by comparator U11, resistors R10 and R12, and capacitor C12. The power supply device 400 supplies power to comparator U11, and resistors R10, R12, and capacitor C12 provide a voltage divider to the non-inverting input of comparator U11. The inverting input of comparator U11 obtains a reference signal voltage for judgment from the reference voltage point VREF1 through resistor R11. When the voltage at the non-inverting input of comparator U11 is higher than that at the inverting input, the output of comparator U11 outputs a fault signal to the fault signal terminal VH_ERR, thereby triggering the alarm state of the fault processing module 24.

[0110] In some embodiments, the power supply detection module 22 includes resistors R14, R17, and R18, capacitors C11 and C13, and a comparator U12. One end of resistor R17 is electrically connected to the power supply terminal B+, and the other end of resistor R17 is electrically connected to one end of resistor R18, one end of capacitor C13, and the inverting input of comparator U12. The other end of resistor R18 is electrically connected to the other end of capacitor C13 and the power supply terminal B-. The output of comparator U12 is electrically used as a fault signal terminal VL_ERR and is electrically connected to the fault handling module 24. The non-inverting input of comparator U12 is electrically connected to one end of resistor R14; the other end of resistor R14 is electrically connected to the reference voltage point VREF1.

[0111] Specifically, comparator U12, resistors R17, R18, R14, and capacitor C13 form a detection structure for the lower limit voltage of the power supply device 400. Specifically, the power supply device 400 supplies power to comparator U12. The voltage divider circuit composed of resistors R17, R18, and capacitor C13 provides the divided voltage of the output voltage of the power supply device 400 to the inverting input terminal of comparator U12. The non-inverting input terminal of comparator U12 obtains the reference signal voltage for judgment from the reference voltage point VREF1 through resistor R14. When the voltage at the inverting input terminal of comparator U12 is lower than that at the non-inverting input terminal, the output terminal of comparator U12 outputs a fault signal to the fault signal terminal VL_ERR, thereby triggering the alarm state of the fault handling module 24.

[0112] Optionally, resistors R10, R17, R18, and R12 can be the equivalent resistance of multiple resistors connected in series or parallel. By adjusting the resistance values ​​of resistors R10, R12, R17, and R18, the voltage detection range between the upper and lower limits of the power supply detection module 22 for the power supply equipment 400 can be adjusted.

[0113] In some implementations, combined Figure 8a As shown, the jump-start control circuit 20 also includes a high temperature detection module 28 and a low temperature detection module 29 to implement protection based on the temperature conditions around the jump-start control circuit 20.

[0114] Specifically, the high-temperature detection module 28 includes a comparator U33, resistors R34, R35, and R36, capacitors C31 and C9, resistors R32 and R37, a switch Q30, resistors R24 and R26. Specifically, resistor R32 is an NTC thermistor. The output of comparator U33 is electrically connected to one end of resistor R24 ​​and the fault signal terminal TMH_ERR. The non-inverting input of comparator U33 is electrically connected to one end of resistor R36. The inverting input of comparator U33 is electrically connected to one end of resistor R35. One end of resistor R34 is electrically connected to the reference voltage point VREF2. The other end of resistor R35 is electrically connected to the other end of resistor R34, one end of capacitor C9, one end of resistor R32, and one end of resistor R37. The other end of resistor R36 is electrically connected to one end of capacitor C31 and the reference voltage point VREF1. The other end of resistor R37 is electrically connected to one current-carrying terminal of switch Q30. The other end of resistor R24 ​​is electrically connected to one end of resistor R26 and the control terminal of switch Q30. The other end of resistor R26 is electrically connected to the other current-carrying terminal of switch Q30, the other end of resistor R32, the other end of capacitor C9, the other end of capacitor C31, and the power supply terminal B-.

[0115] Optionally, comparator U33 is powered by power supply device 400. Capacitor C9 or capacitor C31 is a filter capacitor.

[0116] Specifically, the resistance of the NTC thermistor R32 is affected by the ambient temperature; the higher the temperature, the lower the resistance, and vice versa. A voltage is introduced from the reference voltage point VREF2 through resistor R34, converting the change in resistance of R32 with temperature into a voltage signal that changes synchronously with the temperature. This signal is then input to the inverting input of comparator U33 via resistor R35. A reference voltage signal is input from the reference voltage point VREF1 through resistor R36 to the non-inverting input of comparator U33. When the current temperature is higher than the set value, if the voltage at the inverting input of comparator U33 is lower than the voltage at the non-inverting input, the output of comparator U33 outputs a fault signal to the fault signal terminal TMH_ERR, thereby triggering the alarm state of the fault handling module 24.

[0117] When comparator U33 outputs a high-level signal, the voltage divider circuit composed of resistors R24 and R26 triggers switch Q30 to connect the two current-carrying terminals, thereby connecting resistors R37 and R32 in parallel and reducing the voltage at the inverting input of comparator U33. Therefore, the resistance of resistor R32 needs to rise back to a value exceeding that required for comparator U33 to output a high-level signal in order for comparator U33 to output a low-level fault clear signal and deactivate the temperature anomaly alarm. This is equivalent to the alarm deactivating only after the temperature drops below a set value.

[0118] Optionally, the high-temperature alarm is triggered at 100°C and deactivated at 80°C. Understandably, the resistance values ​​of resistors R34 and R37 can also be adjusted as needed to set these two temperatures.

[0119] Specifically, in combination Figure 8bAs shown, the low-temperature detection module 29 includes a comparator U73, resistors R7, R73, and R74, capacitors C8 and C20, resistors R6 and R8, a switch Q2, resistors R51 and R62. Specifically, resistor R7 is an NTC thermistor. Comparator U73 is directly powered by the power supply device 400. The output pin of comparator U73 is electrically connected to one end of resistor R51 and the fault signal terminal TML_ERR. The non-inverting input of comparator U73 is electrically connected to one end of resistor R74. The inverting input of comparator U73 is electrically connected to one end of resistor R73. One end of resistor R7 is electrically connected to the reference voltage point VREF2. The other end of resistor R73 is electrically connected to the other end of resistor R7, one end of capacitor C20, one end of resistor R6, and one end of resistor R8. The other end of resistor R74 is electrically connected to one end of capacitor C8 and the reference voltage point VREF1. The other end of resistor R8 is electrically connected to one current-carrying terminal of switch Q2. The other end of resistor R51 is electrically connected to one end of resistor R62 and the control terminal of switch Q2. The other end of resistor R62 is electrically connected to the other current-carrying terminal of switch Q2, the other end of resistor R6, the other end of capacitor C20, the other end of capacitor C8, and the power supply terminal B-.

[0120] Specifically, comparator U73 is powered by power supply device 400. Capacitors C8 and C20 are filter capacitors. The resistance of the NTC thermistor R7 is affected by ambient temperature; the lower the temperature, the higher the resistance, and vice versa. Resistor R7 draws voltage from the reference voltage point VREF2, converting its own resistance change with temperature, in conjunction with resistor R6, into a voltage signal that changes synchronously with temperature, and is then input to the inverting input of comparator U73 via resistor R73. The higher the resistance of resistor R7, the lower the voltage at the inverting input of comparator U73. In other words, the lower the temperature, the lower the voltage at the inverting input of comparator U73, and vice versa.

[0121] Specifically, resistor R74 inputs a reference voltage signal from the reference voltage point VREF1 to the non-inverting input of comparator U73. When the voltage at the inverting input of comparator U73 is lower than the voltage at its non-inverting input, the output of comparator U73 outputs a high-level signal to the fault signal terminal TML_ERR, thereby triggering the alarm state of fault handling module 24. In other words, the alarm is triggered when the current temperature is lower than the set value.

[0122] When comparator U73 outputs a high-level signal, the voltage divider circuit composed of resistors R51 and R62 triggers switch Q2 to connect the two current-carrying terminals. This connects resistors R8 and R6 in parallel, reducing the voltage at the inverting input of comparator U73. The resistance of resistor R7 must then decrease until the voltage at the inverting input is higher than the voltage at the non-inverting input before comparator U73 outputs a low-level fault clear signal, thus clearing the temperature abnormality alarm. Understandably, the alarm will only be cleared when the temperature rises above the set value.

[0123] Understandably, the low-temperature alarm is set to -30℃, and the deactivation temperature is set to 25℃. Understandably, these two temperatures can also be set by adjusting the resistance values ​​of resistors R6 and R8 as needed.

[0124] The above embodiments are merely descriptions of preferred embodiments of this application and are not intended to limit the scope of this application. Any modifications and improvements made by those skilled in the art to the technical solutions of this application without departing from the spirit of this application should fall within the protection scope defined by the claims of this application.

Claims

1. A jump-start control circuit, characterized in that, include: A switch module is used to electrically connect to the circuit of the power supply equipment and the power consumption equipment; the switch module has an on state and an off state. A power supply detection module is electrically connected between the positive and negative terminals of the power supply device and generates a fault signal when the output voltage of the power supply device exceeds a predetermined voltage range. An impedance detection module is electrically connected to the switch module; when the resistance of the electrical equipment in the circuit is within a predetermined impedance range, the impedance detection module triggers the switch module to switch to the on state. and The fault handling module is electrically connected to the switch module; when a fault signal is received, the fault handling module triggers the switch module to switch to the off state.

2. The jump-start control circuit according to claim 1, characterized in that, The impedance detection module includes a first resistor branch, comparator U41, and comparator U42. The first resistor branch is electrically connected between the negative terminal of the power supply equipment and the negative terminal of the power consumption equipment. The middle node of the first resistor branch outputs a first feedback voltage to the inverting input terminal of the comparator U41. When the first feedback voltage is less than a first predetermined voltage value, the output terminal of the comparator U41 outputs a fault signal. One end of the first resistor branch outputs a second feedback voltage to the non-inverting input terminal of the comparator U42. When the second feedback voltage is greater than a second predetermined voltage value, the output terminal of the comparator U42 triggers the switching module to switch to the on state.

3. The jump-start control circuit according to claim 1, characterized in that, The switching module includes a relay RLY, a switch Q1, and a second resistor branch. The relay RLY has a coil and a pair of normally open contacts. The switch Q1 has a control terminal and two current-carrying terminals. One end of the coil is electrically connected to one current-carrying terminal of the switch Q1, and the other end of the coil is used to electrically connect to the positive terminal of the power supply device. The other current-carrying terminal of the switch Q1 is used to electrically connect to the negative terminal of the power supply device. One end of the second resistor branch is electrically connected to one current-carrying terminal of the switch Q1, and the other end of the second resistor branch is used to electrically connect to the positive terminal of the power supply device. When the resistance of the electrical device in the circuit is within a predetermined impedance range, the impedance detection module triggers the switch Q1 to conduct. One contact of the pair of normally open contacts is used to electrically connect to the negative terminal of the power supply device, and the other contact is used to electrically connect to the negative terminal of the electrical device.

4. The jump-start control circuit according to claim 3, characterized in that, It also includes a disconnection fault detection module and a load docking terminal electrically connected to the fault handling module; the disconnection fault detection module is also electrically connected to a current-carrying terminal of the switch Q1; when the switch Q1 is disconnected and the potential of the load docking terminal relative to the negative terminal of the power supply equipment is less than a third predetermined voltage value, the disconnection fault detection module outputs a fault signal.

5. The jump-start control circuit according to claim 1, characterized in that, It also includes a light indicator module and a sound alarm module that are electrically connected to the fault handling module respectively; when the fault signal is received, the fault handling module also triggers the light indicator module to generate an alarm light and triggers the sound alarm module to generate an alarm sound.

6. The jump-start control circuit according to claim 1, characterized in that, It also includes a reverse current detection module; the reverse current detection module is used to electrically connect between the negative terminal of the power supply equipment and a load docking terminal; when the potential of the load docking terminal is greater than the potential of the negative terminal of the power supply equipment, the reverse current detection module generates a fault signal.

7. The jump-start control circuit according to claim 1, characterized in that, It also includes a delay module electrically connected to the switch module; the delay module periodically interrupts the impedance detection module's control of the switch module and triggers the switch module to switch to the off state.

8. The jump-start control circuit according to claim 7, characterized in that, The delay module has a button K1; when the button K1 is triggered, the delay module triggers the switch module to switch to the on state.

9. The jump-start control circuit according to claim 7, characterized in that, It also includes a forward current detection module; the forward current detection module is used to be electrically connected between the negative terminal of the power supply equipment and the negative terminal of the power consumption equipment; when the potential of the negative terminal of the power consumption equipment relative to the negative terminal of the power supply equipment is greater than a fourth predetermined voltage value, the forward current detection module outputs a power-on signal; upon receiving the power-on signal, the delay module stops interrupting the impedance detection module and stops triggering the switch module.

10. A jump-start device, characterized in that, Includes the jump-start control circuit as described in any one of claims 1 to 9.

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