CN-122009047-A - Auxiliary power circuit, ignition clamp, starting power device and starting device

Abstract

The application relates to an auxiliary power supply circuit, an ignition clamp, a starting power supply and a starting device. When the potential difference between the two butting terminals is larger than the first voltage threshold value, the access detection module triggers the detection timing module to be maintained in an enabling state. The butt joint detection module is used for outputting detection voltage to the position between the two butt joint terminals, and the detection voltage is reduced along with the reduction of the resistance value between the two butt joint terminals. When the detection voltage is smaller than the second voltage threshold value, the docking detection module triggers the detection timing module to be maintained in an enabled state, voltage drop caused by ignition operation is avoided, the detection timing module is prevented from exiting the enabled state in a detection period, the switch module can be triggered by the detection timing module in time, the on state is restored, and charging and ignition power supply of the automobile storage battery are prevented from being influenced by voltage drop of the automobile storage battery.

Inventors

• ZHU CHUNYI
• LIU ZIYUAN

Assignees

• 深圳市天成实业科技有限公司

Dates

Publication Date

20260512

Application Date

20241031

Claims (20)

1. 1. An auxiliary power circuit, comprising: the switch module is used for being electrically connected between the electrode of the power supply piece and the butt-joint terminal and has a conducting state and a breaking state; the detection timing module is electrically connected with the switch module and is provided with an enabling state, and in the enabling state, the detection timing module alternately clocks the power-on period and the detection period in sequence in time; The access detection module is electrically connected with the detection timing module and is also used for detecting the potential difference between the two butting terminals, triggering the detection timing module to be maintained in an enabling state when the potential difference between the two butting terminals is larger than a first voltage threshold value, and A butt joint detection module for outputting a detection voltage between the two butt joint terminals, wherein the detection voltage decreases along with the decrease of the resistance value between the two butt joint terminals; when the detection voltage is less than a second voltage threshold, the docking detection module triggers the detection timing module to remain in an enabled state.
2. 2. The auxiliary power circuit of claim 1, wherein the access detection module is configured to be electrically connected between a reference voltage point and the detection timing module, and has a conducting state and a breaking state between the reference voltage point and the detection timing module, and wherein the access detection module is in the conducting state when a potential difference between the two docking terminals is greater than the first voltage threshold or the detection voltage is less than the second voltage threshold.
3. 3. The auxiliary power supply circuit according to claim 2, wherein the access detection module comprises a switch Q16 and an access driving unit, the switch Q16 is electrically connected between a reference voltage point and the detection timing module, the access driving unit is electrically connected to a control end of the switch Q16, the access driving unit is further electrically connected between two butting terminals, and the access driving unit is used for triggering the switch Q16 to be turned on when a potential difference between the two butting terminals is greater than the first voltage threshold.
4. 4. The auxiliary power circuit according to claim 3, wherein the access driving unit comprises a first voltage division branch and a switch Q10, the first voltage division branch is used for being electrically connected between two butt-joint terminals, an intermediate node of the first voltage division branch is electrically connected to a control end of the switch Q10, one through-flow end of the switch Q10 is electrically connected to a control end of the switch Q16, the other through-flow end is grounded, and the access driving unit further comprises a delay branch electrically connected between the control end of the switch Q10 and ground.
5. 5. The auxiliary power circuit of claim 2, wherein the docking detection module is electrically connected to the access detection module, wherein the docking detection module outputs a resistive access signal to the access detection module when the detection voltage is less than the second voltage threshold, the resistive access signal being used to trigger the access detection module to switch to a conductive state.
6. 6. The auxiliary power circuit of claim 1, wherein the docking detection module is electrically coupled to the detection timing module, and wherein the docking detection module outputs a resistive access signal to the detection timing module when the detection voltage is less than the second voltage threshold, the resistive access signal being configured to trigger the detection timing module to remain in an enabled state.
7. 7. The auxiliary power circuit of claim 6 wherein the access detection module outputs a voltage access signal to the detection timing module when the potential difference between the two docking terminals is greater than the first voltage threshold, the voltage access signal being used to trigger the detection timing module to remain in an enabled state.
8. 8. The auxiliary power supply circuit according to claim 1, wherein the docking detection module comprises a first resistive branch, a second resistive branch and a first judgment unit, the first resistive branch is used for being electrically connected between two docking terminals, the second resistive branch is connected with the first resistive branch in series between a reference voltage point and ground, a connection node between the first resistive branch and the second resistive branch is electrically connected with the first judgment unit and used for outputting the detection voltage, and the first judgment unit is used for triggering the detection timing module to be maintained in an enabling state when the potential difference of two ends of the first resistive branch is smaller than the second voltage threshold.
9. 9. The auxiliary power circuit according to claim 8, wherein the first judging unit comprises a comparator U7 and a second voltage dividing branch, wherein a connection node between the first resistive branch and the second resistive branch is electrically connected to a non-inverting input terminal of the comparator U7, the second voltage dividing branch is electrically connected between a reference voltage point and ground, an intermediate node of the second voltage dividing branch is electrically connected to an inverting input terminal of the comparator U7, and an output terminal of the comparator U7 is used for triggering the detection timing module to maintain an enabled state.
10. 10. The auxiliary power circuit of claim 1, wherein the detection timing module is maintained in an enabled state under the triggering of the docking detection module when the potential difference between the two docking terminals falls below the first voltage threshold and the detection voltage is less than the second voltage threshold for a window period.
11. 11. The auxiliary power supply circuit according to claim 10, wherein the access detection module comprises a switch Q16, an access driving unit and a short-circuit prevention unit, one current passing end of the switch Q16 is electrically connected to a reference voltage point, the other current passing end is electrically connected to the detection timing module and the short-circuit prevention unit, the access driving unit is used for triggering the switch Q16 to conduct when the potential difference between two butt terminals is larger than the first voltage threshold value, the conduction triggering signal of the access driving unit to the switch Q16 is eliminated after the window period when the potential difference between the two butt terminals falls below the first voltage threshold value, the short-circuit prevention unit is electrically connected to the control ends of the butt detection module and the switch Q16 respectively, and the short-circuit prevention unit triggers the switch Q16 to maintain in the conducting state when the switch Q16 is in the conducting state and the short-circuit prevention unit is triggered by the butt detection module.
12. 12. The auxiliary power circuit of claim 11, wherein the short circuit prevention unit comprises a switching element Q12, a switching element Q17, a first current limiting branch and a third voltage dividing branch, wherein the third voltage dividing branch is electrically connected between an output end of the docking detection module and the ground, an intermediate node of the third voltage dividing branch is electrically connected to a control end of the switching element Q17, the first current limiting branch is electrically connected between one through-flow end of the switching element Q17 and the other through-flow end of the switching element Q16, one through-flow end of the switching element Q17 is further electrically connected to the control end of the switching element Q12, the other through-flow end of the switching element Q17 is grounded, and one through-flow end of the switching element Q12 is electrically connected to the control end of the switching element Q16 and the other through-flow end is grounded.
13. 13. The auxiliary power circuit of claim 10, further comprising a power up module for triggering the detection timing module to switch to an enabled state when manually operated.
14. 14. The auxiliary power supply circuit according to claim 13, wherein the strong starting module comprises a switch Q13, a control unit and a time delay voltage division unit, one through-flow end of the switch Q13 is grounded, the other through-flow end is used for triggering the detection timing module to switch to an enabling state in a conducting state, the time delay voltage division unit is electrically connected between a control end of the switch Q13 and the control unit, the control unit can send an activation signal when being manually controlled, and the time delay voltage division unit triggers the switch Q13 to conduct when the duration of the activation signal is not less than a preset time period.
15. 15. The auxiliary power circuit of claim 14, wherein the power up module further comprises a locking unit for electrically connecting between a reference voltage point and a control terminal of the switching element Q13, the locking unit having a conducting state and a breaking state between the reference voltage point and the control terminal of the switching element Q13, and the other conducting terminal of the switching element Q13 further triggering the locking unit to switch to the conducting state when the other conducting terminal of the switching element Q13 triggers the detection timing module to switch to the enabling state in the conducting state.
16. 16. The auxiliary power circuit of claim 13, further comprising an enable timing module, wherein the enable timing module starts enabling timing when the detection timing module switches to an enabled state, wherein the switch module remains in a disconnected state under the triggering of the enable timing module after the enabling timing is ended, and wherein the triggering of the detection timing module by the forced starting module is inhibited by the enable timing module.
17. 17. The auxiliary power circuit of claim 13, wherein the docking detection module is further configured to inhibit triggering of the detection timing module by the power up module if the detection voltage is less than the second voltage threshold before the detection timing module enters an enabled state.
18. 18. The auxiliary power circuit of claim 13, further comprising an anti-reverse connection module for electrically connecting between two of said butt terminals, said anti-reverse connection module for inhibiting triggering of said detection timing module by said power up module when a reverse potential difference exists between two of said butt terminals.
19. 19. An ignition clip comprising an auxiliary power circuit as claimed in any one of claims 1 to 18 and a docking terminal electrically connected to the auxiliary power circuit.
20. 20. A start-up power supply comprising a power supply element and an auxiliary power supply circuit according to any one of claims 1 to 18, the switch module being electrically connected to the electrodes of the power supply element.

Description

Auxiliary power circuit, ignition clamp, starting power device and starting device Technical Field The application relates to the technical field of automobiles, in particular to an auxiliary power supply circuit, an ignition clamp, a starting power supply and a starting device. Background When the output capacity of the automobile battery cannot meet the ignition requirement, the automobile is started by means of an additional starting power supply. The starting power supply is connected with the automobile storage battery through the ignition clamp to charge the automobile storage battery or directly provide electric power required by starting and igniting the automobile. The ignition clip has a first clip and a second clip. In the case where the start voltage of the start power source is applied to the first clip and the second clip, if the first clip and the second clip are respectively removed from the positive electrode and the negative electrode of the battery of the automobile, there is a risk of short-circuit contact between the first clip and the second clip. In the start-up state of the ignition clamp or start-up power supply, several detection periods are provided which are spaced in time. In the detection period, the transmission of the starting voltage and the first clamp or the second clamp is interrupted, and then the voltage between the first clamp and the second clamp is detected. When the voltage between the first clamp and the second clamp is close to zero, the first clamp or the second clamp is judged to be removed from the automobile battery, the starting state of the ignition clamp or the starting power supply is ended, the standby state is entered, and the starting voltage is not applied between the first clamp and the second clamp any more. However, when the driver performs an ignition operation, since the output current of the automobile battery is large, the voltage between the positive electrode and the negative electrode of the automobile battery is close to zero. When the ignition operation occurs in the detection period, the voltage between the first clamp and the second clamp is close to zero, so that the first clamp or the second clamp is misjudged to be removed from the automobile battery, the starting state is ended in advance, and the ignition clamp or the starting power supply cannot continuously charge the automobile battery and cannot provide power for starting and igniting the automobile. Disclosure of Invention In view of the above, the present invention provides an auxiliary power supply circuit, an ignition clip, a starting power supply, and a starting device that can solve or at least alleviate the above-described technical problems. The invention provides an auxiliary power circuit, comprising: the switch module is used for being electrically connected between the electrode of the power supply piece and the butt-joint terminal and has a conducting state and a breaking state; the detection timing module is electrically connected with the switch module and is provided with an enabling state, and in the enabling state, the detection timing module alternately clocks the power-on period and the detection period in sequence in time; The access detection module is electrically connected with the detection timing module and is also used for detecting the potential difference between the two butting terminals, triggering the detection timing module to be maintained in an enabling state when the potential difference between the two butting terminals is larger than a first voltage threshold value, and A butt joint detection module for outputting a detection voltage between the two butt joint terminals, wherein the detection voltage decreases along with the decrease of the resistance value between the two butt joint terminals; when the detection voltage is less than a second voltage threshold, the docking detection module triggers the detection timing module to remain in an enabled state. According to the auxiliary power circuit, the automobile battery has resistance even if the voltage between the anode and the cathode drops to be close to zero due to the overlarge electric load in the automobile according to the circuit model of the automobile battery. When the two butt-joint terminals are respectively clamped to the positive electrode and the negative electrode of the automobile storage battery, other resistive devices between the two butt-joint terminals are in parallel connection with the internal resistance of the automobile storage battery, and the resistance value between the two butt-joint terminals is smaller than the resistance value of any one of the other resistive devices between the two butt-joint terminals and the internal resistance of the automobile storage battery. In the detection period, when the condition of the ignition operation of the automobile occurs at the same time, the potential difference between the two butting terminals cannot be ensured to b