Protection circuit

By designing a protection circuit including undervoltage protection circuit, shutdown protection circuit and logic activation circuit, the problem of voltage reduction in the body battery due to continuous power supply of electronic equipment is solved, and electronic equipment failure and over-discharge damage of the body battery is avoided.

CN222996223UActive Publication Date: 2025-06-17MAGICYO TECH CO LTD
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Patent Information

Application Number
CN202421738817.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-22
Publication Date
2025-06-17
Estimated Expiration
2034-07-22

AI Technical Summary

Technical Problem

When the body battery is not in use for a long time, the voltage drops due to the continuous power supply of electronic equipment, and reaches an undervoltage state, which cannot maintain the normal operation of the electronic equipment, resulting in repeated restarts and functional disorders, which ultimately leads to excessive discharge of the body battery and damage.

Method used

A protection circuit is designed, including an undervoltage protection circuit, a shutdown protection circuit, a first logic activation circuit and a second logic activation circuit. By receiving the power supply voltage output from the vehicle body battery and outputting control signals to the vehicle-mounted conversion module, electronic equipment avoids the problem of loss of power due to vehicle body battery.

Benefits of technology

It effectively avoids the problems of repeated restarting and functional disorders of electronic devices due to loss of power from the body battery, and prevents continuous loss of power from the body battery, which ultimately leads to damage to the body battery for a long time and protects the user's property.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The utility model discloses an under-voltage protection circuit of a protection circuit, an input end of which is connected with a vehicle body storage battery and an output end of which is connected with a vehicle-mounted conversion module. The input end of the shutdown protection circuit is connected with the main control circuit and the vehicle body storage battery, and the output end is connected with the under-voltage protection circuit; the first logic activation circuit is connected with the under-voltage protection circuit; and the second logic activation circuit is connected with the under-voltage protection circuit. The problems of repeated restart, dysfunction and the like of the electronic equipment due to power shortage of the vehicle body storage battery are avoided, and the situation that the vehicle body storage battery is damaged due to long-time over-discharge and property loss of a user is caused due to continuous power shortage of the vehicle body storage battery is also avoided.
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Description

Technical Field

[0001] The utility model relates to the technical field of vehicle body battery protection, in particular to a protection circuit. Background Art

[0002] With the development of science and technology, electronic devices (such as vehicle-mounted controllers, vehicle-mounted trackers, etc.) are more and more widely used in automobiles, motorcycles, and electric vehicles. After the vehicle is turned off, some vehicle-mounted devices (such as body controllers, body alarms, etc.) still need to rely on the vehicle body battery to continue working to achieve the safety protection of the whole vehicle. When the user has not used the vehicle for a long time, the voltage of the vehicle body battery will become lower and lower due to the continuous operation of the constantly powered devices, reaching an undervoltage state, and it cannot maintain the normal operation of the electronic devices. At this time, the electronic devices will have problems such as repeated restarting and malfunction due to the discharged vehicle body battery, resulting in continuous discharge of the vehicle body battery, and finally causing the vehicle body battery to be over-discharged for a long time and damaged, causing property losses to the user. Summary of the Utility Model

[0003] Based on this, it is necessary to propose a protection circuit for the above problems.

[0004] A protection circuit includes:

[0005] An undervoltage protection circuit, with its input end connected to the vehicle body battery and its output end connected to the vehicle-mounted conversion module, is used to receive the supply voltage output by the vehicle body battery and output a first control signal to the vehicle-mounted conversion module;

[0006] A shutdown protection circuit, with its input end connected to the main control circuit and the vehicle body battery and its output end connected to the undervoltage protection circuit, is used to receive a second control signal and a third control signal output by the main control circuit and make the undervoltage protection circuit output the first control signal to the vehicle-mounted conversion module;

[0007] A first logic activation circuit, connected to the undervoltage protection circuit, is used to output a first activation signal to the undervoltage protection circuit and make the undervoltage protection circuit output the first control signal to the vehicle-mounted conversion module;

[0008] A second logic activation circuit, connected to the undervoltage protection circuit, is used to output a second activation signal to the undervoltage protection circuit and make the undervoltage protection circuit output the first control signal to the vehicle-mounted conversion module.

[0009] In one embodiment, the undervoltage protection circuit includes:

[0010] A voltage dividing circuit, with its input end connected to the vehicle body battery and its output end connected to the output circuit, is used to divide the supply voltage output by the vehicle body battery to obtain a first voltage and output the first voltage to the output circuit;

[0011] The output circuit, whose output terminal is connected to the vehicle-mounted conversion module, is used to receive the first voltage and output a first control signal to the vehicle-mounted conversion module.

[0012] In one embodiment, the shutdown protection circuit includes:

[0013] A switch circuit, whose input terminal is connected to the main control circuit and the vehicle body battery, and whose output terminal is connected to the input terminal of the delay circuit, is used to receive the second control signal and the third control signal output by the main control circuit and output a fourth control signal to the delay circuit;

[0014] The delay circuit, whose output terminal is connected to the undervoltage protection circuit, is used to receive the fourth control signal and output the first control signal to the vehicle-mounted conversion module.

[0015] In one embodiment, the voltage division circuit includes: a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0016] One end of the first resistor is connected to the vehicle body battery, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded;

[0017] Both ends of the fourth resistor are also connected to the output circuit.

[0018] In one embodiment, the output circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, a first triode, a second triode, and a first diode;

[0019] One end of the fifth resistor is connected to one end of the first resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the base of the first triode;

[0020] The collector of the first triode is connected to one end of the fourth resistor, and the emitter of the first triode is grounded;

[0021] The collector of the second triode is connected to the base of the first triode, the base of the second triode is connected to one end of the seventh resistor, and the emitter of the second triode is grounded;

[0022] The other end of the seventh resistor is connected to the cathode of the first diode, and the anode of the first diode is connected to the vehicle-mounted conversion module.

[0023] In one embodiment, the switch circuit includes: a first switch, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a MOS transistor, a third triode, and a fourth triode;

[0024] One end of the first switch is connected to the vehicle body battery, and the other end is connected to one end of the eighth resistor. The other end of the eighth resistor is connected to one end of the ninth resistor. The other end of the ninth resistor is connected to one end of the tenth resistor, and the other end of the tenth resistor is grounded;

[0025] One end of the eleventh resistor is connected to the main control circuit, and the other end is connected to the collector of the fourth triode;

[0026] The base of the fourth triode is connected to one end of the tenth resistor, and the emitter of the fourth triode is grounded;

[0027] The emitter of the third triode is connected to the main control circuit. The collector of the third triode is connected to the delay circuit, and the base of the third triode is connected to one end of the twelfth resistor;

[0028] The other end of the twelfth resistor is connected to the drain of the MOS transistor. The gate of the MOS transistor is connected to the collector of the fourth triode, and the source of the MOS transistor is grounded.

[0029] In one embodiment, the delay circuit includes: a thirteenth resistor, a first capacitor, and a second diode;

[0030] The anode of the second diode is connected to the collector of the third triode. The cathode of the second diode is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the undervoltage protection circuit;

[0031] One end of the first capacitor is connected to the cathode of the second diode, and the other end of the first capacitor is grounded.

[0032] In one embodiment, the first logic activation circuit includes: a second switch and a third diode;

[0033] One end of the second switch is connected to the vehicle body battery. The other end of the second switch is connected to the anode of the third diode, and the cathode of the third diode is connected to the undervoltage protection circuit.

[0034] In one embodiment, the second logic activation circuit includes: a third switch, a thirteenth resistor, and a fifth triode;

[0035] One end of the third switch is grounded, the other end of the third switch is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the base of the fifth triode;

[0036] The collector of the fifth triode is grounded, and the emitter of the fifth triode is connected to the undervoltage protection circuit.

[0037] Implementing the embodiments of the present invention will have the following beneficial effects:

[0038] In this application, the undervoltage protection circuit receives the supply voltage output by the vehicle body battery and outputs a first control signal to the vehicle-mounted conversion module; the shutdown protection circuit receives the second control signal and the third control signal output by the main control circuit and enables the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module; the first logic activation circuit outputs a first activation signal to the undervoltage protection circuit and enables the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module; the second logic activation circuit outputs a second activation signal to the undervoltage protection circuit and enables the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module. This avoids problems such as repeated restarting and functional disorders of electronic devices due to the discharge of the vehicle body battery, and also avoids continuous discharge of the vehicle body battery, ultimately resulting in damage to the vehicle body battery due to long-term over-discharge and causing property losses to users. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Among them:

[0041] Figure 1 It is a structural block diagram of the protection circuit in one embodiment;

[0042] Figure 2 It is a circuit diagram of the protection circuit in one embodiment. Detailed Embodiments

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0044] With the development of science and technology, electronic devices (such as vehicle-mounted controllers, vehicle-mounted trackers, etc.) are increasingly widely used in automobiles, motorcycles, and electric vehicles. After the vehicle is turned off, some vehicle-mounted devices (such as body controllers, body alarms, etc.) still need to rely on the vehicle battery to continue working to achieve safety protection for the entire vehicle. When the user has not used the vehicle for a long time, the voltage of the vehicle battery will become lower and lower due to the continuous operation of the constantly powered devices, reaching an under-voltage state and being unable to maintain the normal operation of the electronic devices. At this time, the electronic devices will have problems such as repeated restarting and malfunction due to the discharged vehicle battery, resulting in continuous discharge of the vehicle battery and ultimately causing the vehicle battery to be over-discharged for a long time and damaged, causing property losses to the user. To solve the above technical problems, the present application provides a protection circuit, as Figure 1 shown, including: an under-voltage protection circuit 10, a shutdown protection circuit 20, a first logic activation circuit 30, and a second logic activation circuit 40. Among them, the input end of the under-voltage protection circuit 10 is connected to the vehicle battery, and the output end is connected to the vehicle-mounted conversion module, and is used to receive the supply voltage output by the vehicle battery and output a first control signal to the vehicle-mounted conversion module; the input end of the shutdown protection circuit 20 is connected to the main control circuit and the vehicle battery, and the output end is connected to the under-voltage protection circuit 10, and is used to receive the second control signal and the third control signal output by the main control circuit and make the under-voltage protection circuit 10 output the first control signal to the vehicle-mounted conversion module; the first logic activation circuit 30 is connected to the under-voltage protection circuit 10 and is used to output a first activation signal to the under-voltage protection circuit 10 and make the under-voltage protection circuit 10 output the first control signal to the vehicle-mounted conversion module; the second logic activation circuit 40 is connected to the under-voltage protection circuit 10 and is used to output a second activation signal to the under-voltage protection circuit 10 and make the under-voltage protection circuit 10 output the first control signal to the vehicle-mounted conversion module. The present application receives the supply voltage output by the vehicle battery through the under-voltage protection circuit and outputs a first control signal to the vehicle-mounted conversion module; the shutdown protection circuit receives the second control signal and the third control signal output by the main control circuit and makes the under-voltage protection circuit output the first control signal to the vehicle-mounted conversion module; the first logic activation circuit outputs a first activation signal to the under-voltage protection circuit and makes the under-voltage protection circuit output the first control signal to the vehicle-mounted conversion module; the second logic activation circuit outputs a second activation signal to the under-voltage protection circuit and makes the under-voltage protection circuit output the first control signal to the vehicle-mounted conversion module. This avoids problems such as repeated restarting and malfunction of the electronic devices due to the discharged vehicle battery, and also avoids continuous discharge of the vehicle battery, ultimately resulting in long-term over-discharge and damage of the vehicle battery, causing property losses to the user.

[0045] In one embodiment, as Figure 2As shown, the under-voltage protection circuit 10 includes: a voltage division circuit 101 and an output circuit 102. Among them, the input end of the voltage division circuit 101 is connected to the vehicle body battery, and the output end is connected to the output circuit 102, which is used to divide the supply voltage output by the vehicle body battery to obtain a first voltage and output the first voltage to the output circuit 102; the output end of the output circuit 102 is connected to the vehicle-mounted conversion module, which is used to receive the first voltage and output a first control signal to the vehicle-mounted conversion module.

[0046] In one embodiment, as Figure 2 As shown, the shutdown protection circuit 20 includes: a switch circuit 201 and a delay circuit 202. Among them, the input end of the switch circuit 201 is connected to the main control circuit and the vehicle body battery, and the output end is connected to the input end of the delay circuit 202, which is used to receive the second control signal and the third control signal output by the main control circuit and output a fourth control signal to the delay circuit 202; the output end of the delay circuit 202 is connected to the under-voltage protection circuit 10, which is used to receive the fourth control signal and output the first control signal to the vehicle-mounted conversion module.

[0047] In one embodiment, as Figure 2 As shown, the voltage division circuit 101 includes: a first resistor R1, a second resistor R2, a third resistor R13, and a fourth resistor R3; among them, one end of the first resistor R1 is connected to the vehicle body battery, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the third resistor R13, the other end of the third resistor R13 is connected to one end of the fourth resistor R3, and the other end of the fourth resistor R3 is grounded; both ends of the fourth resistor R3 are also connected to the output circuit 102.

[0048] In one embodiment, as Figure 2As shown, the output circuit 102 includes: a fifth resistor R6, a sixth resistor R15, a seventh resistor R5, a first triode Q1, a second triode Q2, and a first diode D2. Among them, one end of the fifth resistor R6 is connected to one end of the first resistor R1. The other end of the fifth resistor R6 is connected to one end of the sixth resistor R15. The other end of the sixth resistor R15 is connected to the base of the first triode Q1. The collector of the first triode Q1 is connected to one end of the fourth resistor R3. The emitter of the first triode Q1 is grounded. The collector of the second triode Q2 is connected to the base of the first triode Q1. The base of the second triode Q2 is connected to one end of the seventh resistor R5. The emitter of the second triode Q2 is grounded. The other end of the seventh resistor R5 is connected to the cathode of the first diode D2. The anode of the first diode D2 is connected to the vehicle-mounted conversion module.

[0049] In one embodiment, as Figure 2 As shown, the switch circuit 201 includes: a first switch S1, an eighth resistor R10, a ninth resistor R11, a tenth resistor R12, an eleventh resistor R9, a twelfth resistor R8, a MOS transistor Q8, a third triode Q5, and a fourth triode Q7. Among them, one end of the first switch S1 is connected to the vehicle body battery, and the other end is connected to one end of the eighth resistor R10. The other end of the eighth resistor R1 is connected to one end of the ninth resistor R11. The other end of the ninth resistor R11 is connected to one end of the tenth resistor R12. The other end of the tenth resistor R12 is grounded. One end of the eleventh resistor R9 is connected to the main control circuit, and the other end is connected to the collector of the fourth triode Q7. The base of the fourth triode Q7 is connected to one end of the tenth resistor R12. The emitter of the fourth triode Q7 is grounded. The emitter of the third triode Q5 is connected to the main control circuit. The collector of the third triode Q5 is connected to the delay circuit 202. The base of the third triode Q5 is connected to one end of the twelfth resistor R8. The other end of the twelfth resistor R8 is connected to the drain of the MOS transistor Q8. The gate of the MOS transistor Q8 is connected to the collector of the fourth triode Q7. The source of the MOS transistor Q8 is grounded.

[0050] In one embodiment, as Figure 2As shown, the delay circuit 202 includes: a thirteenth resistor R7, a first capacitor C1, and a second diode D3; wherein, the anode of the second diode D3 is connected to the collector of the third triode Q5, the cathode of the second diode D3 is connected to one end of the thirteenth resistor R7, and the other end of the thirteenth resistor R7 is connected to the undervoltage protection circuit 10; one end of the first capacitor C1 is connected to the cathode of the second diode D3, and the other end of the first capacitor C1 is grounded.

[0051] In one embodiment, as Figure 2 shown, the first logic activation circuit 30 includes: a second switch S2 and a third diode D1; wherein, one end of the second switch S2 is connected to the vehicle body battery, the other end of the second switch S2 is connected to the anode of the third diode D1, and the cathode of the third diode D1 is connected to the undervoltage protection circuit 10.

[0052] In one embodiment, as Figure 2 shown, the second logic activation circuit 40 includes: a third switch S3, a thirteenth resistor R4, and a fifth triode Q3; wherein, one end of the third switch S3 is grounded, the other end of the third switch S3 is connected to one end of the thirteenth resistor R4, and the other end of the thirteenth resistor R4 is connected to the base of the fifth triode Q3; the collector of the fifth triode Q3 is grounded, and the emitter of the fifth triode Q3 is connected to the undervoltage protection circuit 10.

[0053] This application receives the power supply voltage output by the vehicle body battery through the undervoltage protection circuit and outputs a first control signal to the vehicle-mounted conversion module; the shutdown protection circuit receives the second control signal and the third control signal output by the main control circuit and enables the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module; the first logic activation circuit outputs a first activation signal to the undervoltage protection circuit and enables the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module; the second logic activation circuit outputs a second activation signal to the undervoltage protection circuit and enables the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module. This avoids problems such as repeated restarting and function disorders of the electronic device due to the discharge of the vehicle body battery, and also avoids continuous discharge of the vehicle body battery, which ultimately leads to damage to the vehicle body battery due to long-term over-discharge and causes property losses to users.

[0054] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A protection circuit, characterized in that: include: An undervoltage protection circuit, the input end of which is connected to the vehicle body battery, the output end of which is connected to the vehicle-mounted conversion module, and is used to receive the power supply voltage output by the vehicle body battery and output a first control signal to the vehicle-mounted conversion module; A shutdown protection circuit, the input end of which is connected to the main control circuit and the vehicle body battery, and the output end of which is connected to the undervoltage protection circuit, for receiving the second control signal and the third control signal output by the main control circuit, and causing the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module; a first logic activation circuit, connected to the undervoltage protection circuit, configured to output a first activation signal to the undervoltage protection circuit and enable the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module; The second logic activation circuit is connected to the undervoltage protection circuit, and is used to output a second activation signal to the undervoltage protection circuit and enable the undervoltage protection circuit to output the first control signal to the vehicle-mounted conversion module.

2. The protection circuit according to claim 1, characterized in that: The undervoltage protection circuit comprises: a voltage divider circuit, the input end of which is connected to the vehicle body battery, the output end of which is connected to the output circuit, for dividing the supply voltage output by the vehicle body battery to obtain a first voltage, and outputting the first voltage to the output circuit; The output circuit has an output end connected to the vehicle-mounted conversion module, is used to receive the first voltage, and output a first control signal to the vehicle-mounted conversion module.

3. The protection circuit according to claim 1, characterized in that: The shutdown protection circuit comprises: A switch circuit, whose input end is connected to the main control circuit and the vehicle body battery, and whose output end is connected to the input end of the delay circuit, is used to receive the second control signal and the third control signal output by the main control circuit, and output a fourth control signal to the delay circuit; The output end of the delay circuit is connected to the undervoltage protection circuit, and is used to receive the fourth control signal and output the first control signal to the vehicle-mounted conversion module.

4. The protection circuit according to claim 2, characterized in that: The voltage divider circuit comprises: a first resistor, a second resistor, a third resistor and a fourth resistor; One end of the first resistor is connected to the vehicle body battery, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded; Both ends of the fourth resistor are also connected to the output circuit.

5. The protection circuit according to claim 4, characterized in that: The output circuit comprises: a fifth resistor, a sixth resistor, a seventh resistor, a first triode, a second triode and a first diode; One end of the fifth resistor is connected to one end of the first resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the base of the first transistor; The collector of the first transistor is connected to one end of the fourth resistor, and the emitter of the first transistor is grounded; The collector of the second transistor is connected to the base of the first transistor, the base of the second transistor is connected to one end of the seventh resistor, and the emitter of the second transistor is grounded; The other end of the seventh resistor is connected to the cathode of the first diode, and the anode of the first diode is connected to the vehicle-mounted conversion module.

6. The protection circuit according to claim 3, characterized in that: The switch circuit includes: a first switch, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a MOS transistor, a third transistor and a fourth transistor; One end of the first switch is connected to the vehicle body battery, and the other end is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to one end of the ninth resistor, the other end of the ninth resistor is connected to one end of the tenth resistor, and the other end of the tenth resistor is grounded; One end of the eleventh resistor is connected to the main control circuit, and the other end is connected to the collector of the fourth transistor; The base of the fourth triode is connected to one end of the tenth resistor, and the emitter of the fourth triode is grounded; The emitter of the third triode is connected to the main control circuit, the collector of the third triode is connected to the delay circuit, and the base of the third triode is connected to one end of the twelfth resistor; The other end of the twelfth resistor is connected to the drain of the MOS tube, the gate of the MOS tube is connected to the collector of the fourth transistor, and the source of the MOS tube is grounded.

7. The protection circuit according to claim 6, characterized in that: The delay circuit comprises: a thirteenth resistor, a first capacitor and a second diode; The anode of the second diode is connected to the collector of the third transistor, the cathode of the second diode is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the undervoltage protection circuit; One end of the first capacitor is connected to the cathode of the second diode, and the other end of the first capacitor is grounded.

8. The protection circuit according to claim 1, characterized in that: The first logic activation circuit includes: a second switch and a third diode; One end of the second switch is connected to the vehicle body battery, the other end of the second switch is connected to the anode of the third diode, and the cathode of the third diode is connected to the undervoltage protection circuit.

9. The protection circuit according to claim 1, characterized in that: The second logic activation circuit includes: a third switch, a thirteenth resistor and a fifth triode; One end of the third switch is grounded, the other end of the third switch is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the base of the fifth transistor; The collector of the fifth transistor is grounded, and the emitter of the fifth transistor is connected to the undervoltage protection circuit.