Overvoltage protection circuit
By designing a circuit that includes an overvoltage protection module, a reverse connection protection module, and a control module, and by using a combination of Zener diodes and transistors to control the voltage, the protection problem of electronic equipment under overvoltage conditions is solved, thereby improving the stability and lifespan of the equipment.
Patent Information
- Application Number
- CN202422954211.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-02
AI Technical Summary
In the existing technology, electronic devices lack optimized protection circuit designs for different application scenarios when faced with overvoltage conditions, which leads to damage or destruction of the equipment.
Design an overvoltage protection circuit, including an overvoltage protection module, a reverse connection protection module, and a control module. The circuit uses a combination of Zener diodes, transistors, and MOSFETs to control and protect the voltage.
It effectively protects electronic equipment from overvoltage damage, optimizes circuit structure, and improves equipment lifespan and reliability.
Smart Images
Figure CN223613029U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to an overvoltage protection circuit. BACKGROUND
[0002] In the field of electronic technology today, the stable operation of circuits is crucial for the normal work of various electronic devices. With the continuous progress of technology, the types of electronic devices are increasingly diverse, and their application scenarios are becoming more and more widespread, from consumer electronics products to industrial control devices, from communication equipment to medical instruments, etc., covering almost all aspects of people's life and work.
[0003] However, during the operation of these electronic devices, they often face the problem of unstable voltage. Due to power grid fluctuations, lightning strikes, equipment failures, etc., overvoltage may occur in the circuit. Overvoltage phenomenon can cause serious damage to electronic devices, reduce the service life of the device, and even cause the device to be completely damaged and unable to work normally. There are some overvoltage protection circuits in the prior art, but how to design a structure-optimized protection circuit for different application scenarios still needs researchers to design reasonably. CONTENT OF THE INVENTION
[0004] One of the main purposes of the present application is to provide an overvoltage protection circuit, which sets an overvoltage protection circuit in the control circuit of the battery, and applies an overvoltage protection module, an anti-reverse connection module and a control module to jointly meet the needs of overvoltage protection, anti-reverse connection and current control, etc. The overvoltage protection module controls the voltage output through the combination of a voltage stabilizing tube, a triode and a field effect tube, realizes the on-off of the triode and the field effect tube, and thus at least to some extent overcomes one or more problems caused by the limitations and defects of related technologies.
[0005] To achieve the above application purposes, the present application adopts the following technical solutions:
[0006] According to one aspect of the present application, a kind of overvoltage protection circuit is provided, including overvoltage protection module, anti-reverse module and control module, the overvoltage protection module and the control module are connected respectively the anti-reverse module, the anti-reverse module is used to connect battery, the overvoltage protection module includes first resistance, second resistance, stabilivolt tube, triode and first field effect tube, the first resistance is connected with the stabilivolt tube in series and is connected input voltage, the anode of stabilivolt tube is grounded, the base of first triode is connected the output end of the first resistance, the emitter of first triode is connected the positive pole of input voltage, the collector of first triode is connected one end of the second resistance, the other end of the second resistance is grounded, the gate of first field effect tube is connected the collector of first triode, the source of first field effect tube is connected the emitter of first triode, the drain of first field effect tube is connected output voltage.
[0007] According to one embodiment of the present application, the stabilizing value of the stabilivolt tube is 6V.
[0008] According to one embodiment of the present application, the model of the first field effect tube is SI2301.
[0009] According to one embodiment of the present application, the resistance of the first resistance is 10K ohm, and the resistance of the second resistance is 10K ohm.
[0010] According to one embodiment of the present application, the model of the first triode is MMBT3906.
[0011] According to one embodiment of the present application, the anti-reverse module includes a second field effect tube, a diode, a third resistance and a fourth resistance, the drain of the second field effect tube is used to connect the positive pole of the battery, the source of the second field effect tube is connected to the cathode of the diode, the anode of the diode is connected to the drain of the first field effect tube, the third resistance is connected to the control module and the anode of the diode respectively, and the fourth resistance is connected to the gate of the second field effect tube and the anode of the diode respectively.
[0012] According to one embodiment of the present application, the control module is used to receive the control signal of the control chip, and the control module includes a second triode, a fifth resistance and a sixth resistance, the collector of the second triode is connected to the gate of the second field effect tube, the emitter of the second triode is connected to the sixth resistance, the base of the second triode is connected to the fifth resistance, the other end of the fifth resistance is connected to the third resistance and the control chip, and the other end of the sixth resistance is grounded.
[0013] In the application, the overvoltage protection circuit is applied to the control circuit of the lithium battery. By setting the overvoltage protection module, the reverse connection prevention module and the control module, better protection of the control circuit of the lithium battery is realized. The overvoltage protection module is connected in series and parallel with the voltage stabilizing tube, the triode and the field effect tube. The on-off of the field effect tube is changed by the on-off of the voltage stabilizing tube and the triode, so that the overvoltage protection during the output of the direct current is effectively controlled by the optimized circuit structure.
[0014] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS
[0015] The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
[0016] Figure 1 is a structural schematic diagram of an intelligent cleaning system according to an exemplary embodiment. DETAILED DESCRIPTION
[0017] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the implementations set forth in this disclosure; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus a detailed description of them will not be repeated.
[0018] Referring to Figure 1 In an embodiment, the overvoltage protection circuit includes an overvoltage protection module, a reverse connection prevention module and a control module. The overvoltage protection module and the control module are respectively connected with the reverse connection prevention module. The reverse connection prevention module is used for connecting the battery. The control module is used for receiving the control signal output by the control chip.
[0019] In an embodiment, the overvoltage protection module includes a first resistor R1, a second resistor R2, a voltage stabilizing tube D1, a first triode Q2 and a first field effect tube Q1. The first resistor R1 is connected in series with the voltage stabilizing tube D1 and is connected to the input voltage. The anode of the voltage stabilizing tube D1 is connected to the ground. The base of the first triode Q2 is connected to the output end of the first resistor R1. The emitter of the first triode Q2 is connected to the positive pole of the input voltage. The collector of the first triode Q2 is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the ground. The gate of the first field effect tube Q1 is connected to the collector of the triode Q1. The source of the first field effect tube Q1 is connected to the emitter of the first triode Q2. The drain of the first field effect tube Q1 is connected to the pin BAT IN of the output voltage.
[0020] In the specific embodiment, the positive pole of the direct current power supply is connected with one end of the first resistor R1, the emitter of the first triode Q2 and the source of the first field effect tube Q1. The other end of the first resistor R1 is connected with the positive pole of the stabilizing tube D1 and the base of the first triode Q2, and the negative pole of the stabilizing tube D1 is grounded. Preferably, the stabilizing value of the stabilizing tube D1 is 6V, the resistance value of the first resistor R1 is 10KΩ, and the resistance value of the second resistor R2 is 10KΩ. The model of the first triode Q2 is MMBT3906, and the model of the first field effect tube Q1 is SI2301.
[0021] When the input voltage is less than 6V, the stabilizing tube D1 is not conductive, the base voltage of the first triode Q2 is equal to the emitter voltage, and the first triode Q2 is also not conductive. At this time, the voltage difference between the gate and the source of the first field effect tube Q1 reaches the conductive condition, the first field effect tube Q1 is conductive, the normal output voltage, and the output voltage BAT IN can normally provide voltage for the load.
[0022] When the input voltage is greater than 6V, the stabilizing tube D1 is conductive, the voltage difference between the base and the emitter of the first triode Q2 reaches the conductive condition, and the first triode Q2 is also conductive. At this time, the gate voltage and the source voltage of the first field effect tube Q1 are equal, the first field effect tube Q1 is turned off, the output voltage is cut off, and the output voltage BAT IN cannot provide voltage for the load.
[0023] In an embodiment, the anti-reverse connection module includes a second field effect tube Q3, a diode D2, a third resistor R3 and a fourth resistor R4. The drain of the second field effect tube Q3 is used to connect the positive pole BAT+ of the battery, the source of the second field effect tube Q3 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the drain of the first field effect tube Q1, the third resistor R3 is connected with the control module and the anode of the diode D2 respectively, and the fourth resistor R4 is connected with the gate of the second field effect tube Q3 and the anode of the diode D2 respectively.
[0024] In the specific embodiment, the model of the second field effect tube Q3 is SI2301, and the model of the diode D2 is SS24.
[0025] In an embodiment, the control module includes a second triode Q4, a fifth resistor R5 and a sixth resistor R6. The collector of the second triode Q4 is connected with the gate of the second field effect tube Q3, the emitter of the second triode Q4 is connected with the sixth resistor R6, the base of the second triode Q4 is connected with the fifth resistor R5, the other end of the fifth resistor R5 is connected with the third resistor R3 and the control pin CHRG PWM of the control chip, and the other end of the sixth resistor R6 is grounded. Preferably, the model of the second triode Q4 is MMBT3904.
[0026] The above merely provides preferred embodiments of the application, and is not intended to limit the application. The application can be variously changed and modified by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall fall within the protection scope of the application.
Claims
1. An overvoltage protection circuit, characterized by, The application relates to a battery protection module, which comprises an overvoltage protection module, a reverse connection prevention module and a control module, wherein the overvoltage protection module and the control module are connected to the reverse connection prevention module, the reverse connection prevention module is used for connecting a battery, the overvoltage protection module comprises a first resistor, a second resistor, a voltage stabilizing tube, a first triode and a first field effect tube, the first resistor and the voltage stabilizing tube are connected in series and are connected to an input voltage, the anode of the voltage stabilizing tube is connected to ground, the base of the first triode is connected to the output end of the first resistor, the emitter of the first triode is connected to the positive pole of the input voltage, the collector of the first triode is connected to one end of the second resistor, the other end of the second resistor is connected to ground, the gate of the first field effect tube is connected to the collector of the first triode, the source of the first field effect tube is connected to the emitter of the first triode, and the drain of the first field effect tube is connected to an output voltage.
2. The overvoltage protection circuit of claim 1, wherein, The voltage stabilizing value of the voltage stabilizing tube is 6V.
3. The overvoltage protection circuit of claim 1, wherein, The model of the first field effect tube is SI2301.
4. The overvoltage protection circuit of claim 1, wherein, The resistance value of the first resistor is 10K ohms, and the resistance value of the second resistor is 10K ohms.
5. The overvoltage protection circuit of claim 1, wherein, The model of the first triode is MMBT3906.
6. The overvoltage protection circuit of claim 1, wherein, The reverse connection prevention module comprises a second field effect tube, a diode, a third resistor and a fourth resistor, the drain of the second field effect tube is used for connecting the positive pole of the battery, the source of the second field effect tube is connected to the cathode of the diode, the anode of the diode is connected to the drain of the first field effect tube, the two ends of the third resistor are respectively connected to the control module and the anode of the diode, and the two ends of the fourth resistor are respectively connected to the gate of the second field effect tube and the anode of the diode.
7. The overvoltage protection circuit of claim 6, wherein, The control module is used for receiving the control signal of a control chip, the control module comprises a second triode, a fifth resistor and a sixth resistor, the collector of the second triode is connected to the gate of the second field effect tube, the emitter of the second triode is connected to the sixth resistor, the base of the second triode is connected to the fifth resistor, the other end of the fifth resistor is connected to the third resistor and the control chip, and the other end of the sixth resistor is connected to ground.