Positive and negative charging protection circuit
By designing a forward and reverse charging protection circuit, and utilizing components such as a protection module, a filtering module, and a voltage regulator module to achieve bidirectional current conduction, the safety problem caused by the inconsistency between the polarity of the charger output line port and the battery protection board input port is solved, ensuring the safety and reliability of the charging process.
Patent Information
- Application Number
- CN202422162903.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-09-03
AI Technical Summary
If the positive and negative terminals of the output line port of the existing charger are inconsistent with the positive and negative terminals of the input port of the battery protection board, it may cause damage to the charger, damage to the battery, and safety hazards, such as fires.
Design a forward and reverse charging protection circuit, including a protection module, a filtering module, a voltage regulator module and an indicator module. The circuit uses components such as diodes, voltage regulators and transistors to achieve bidirectional current conduction, ensuring the normal operation of the charging process.
Even if the positive and negative terminals of the charger output line port are not the same as those of the battery protection board input port, it can still charge normally, avoiding charger failure and safety accidents.
Smart Images
Figure CN223567325U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to electric vehicle bicycle charging technology field, specifically to a positive and negative charging protection circuit. BACKGROUND
[0002] The battery protection board is a circuit for providing protection for the battery in time when the battery is charged abnormally. Its stability, reliability and the like have relatively high requirements. Some battery chargers on the market may not be original when charging the battery. The positive and negative levels of the output line port may not be consistent with the positive and negative poles of the battery protection board input port. At this time, the battery reverse connection will cause the charger to be damaged, the battery to be damaged, and even cause a fire and other events that endanger personal safety. Some battery chargers have anti-reverse connection function, but the instantaneous huge current of the battery reverse connection will still cause a part of the chargers with reverse connection protection function to fail, causing failure. The charger that does not fail cannot charge the battery because the output is not consistent with the polarity of the battery.
[0003] Therefore, the present application continues to provide a more reasonable circuit that does not cause safety problems even when the positive and negative levels of the output line port of the charger are inconsistent with the positive and negative poles of the input port of the battery protection board, and can also charge. Only a few simple components are needed to realize the battery positive and negative connection charging function. SUMMARY
[0004] The present application provides a positive and negative charging protection circuit, and the technical problem to be solved by the present application is the safety problem caused by the inconsistency between the positive and negative levels of the output line port of the charger and the positive and negative poles of the input port of the battery protection board. Therefore, a more reasonable and simpler battery protection board positive and negative connection charging circuit is provided. Only a few simple components are needed to realize the battery positive and negative connection charging function, so that the inconsistency between the positive and negative levels of the output line port of the charger and the positive and negative poles of the input port of the battery protection board does not cause the charger to fail, and even cause a fire and other accidents.
[0005] The technical scheme of the present application is as follows:
[0006] A positive and negative charging protection circuit is connected between the battery and the charger, comprising a protection module, a filtering module, a voltage stabilizing module and an indication module. The input of the protection module serves as the total input of the positive and negative charging protection circuit. The output of the protection module is connected to the input of the filtering module. The output of the filtering module is connected to the input of the voltage stabilizing module. The output of the voltage stabilizing module is connected to a diode D6 pointing to the battery. The indication module is connected in parallel with the diode D6. The output of the voltage stabilizing module is connected to the positive and negative poles of the battery.
[0007] As a further optimization of the present solution, the protection module comprises diodes D1-D4, the anode of the diode D1 is connected to the cathode of the diode D4, the anode of the diode D2 is connected to the cathode of the diode D3, the cathode of the diode D1 is connected to the cathode of the diode D2, the anode of the diode D4 is connected to the anode of the diode D3, the parallel point of the diode D1 and the diode D2 is the positive output of the protection circuit, and the parallel point of the diode D4 and the diode D3 is grounded.
[0008] As a further optimization of the present solution, the voltage stabilization module comprises an inductor L7, a diode D5 and a voltage stabilizing tube D7, the inductor L7 and the diode D5 are connected in series between the output of the diode D5 and the power supply ground, and the cathode of the voltage stabilizing tube points to the diode D5.
[0009] As a further optimization of the present solution, the voltage stabilization module comprises a voltage stabilizer U1, the input of the voltage stabilizer U1 is connected to the output of the filter module, the output of the voltage stabilizer U1 is connected with a diode D6, and the diode D6 points to the positive electrode of the battery.
[0010] As a further optimization of the present solution, the indication module comprises diodes LED1 and LED2 connected in parallel, and the pointing directions of the diodes LED1 and LED2 are opposite.
[0011] As a further optimization of the present solution, the anode of the diode LED2 is connected to an inductor L13, and the cathode of the diode LED1 is connected to a resistor R7.
[0012] As a further optimization of the present solution, a triode Q6 is further included, the collector of the triode Q6 is connected to the anode of the diode D5 through a resistor R5, the emitter of the triode Q6 is grounded, resistors R11-R13 are connected in parallel between the two levels of the battery, and the series point of the resistor R12 and the resistor R13 is connected to the base of the triode Q6.
[0013] The working principle and beneficial effects of the present application are as follows:
[0014] When the positive and negative levels of the charger output line port are consistent with the positive and negative levels of the battery protection plate input port, the current output by the charger passes through Vin+, D1, and then reaches the positive level of the battery B1 after the voltage and current are detected by the battery protection plate. Subsequently, the current flows out from the negative level of the battery B1, passes through the BMS and D3, and returns to Vin- to complete a whole charging process. When the positive and negative levels of the charger output line port are inconsistent with the positive and negative levels of the battery protection plate input port, the current output by the charger passes through Vin- and D2, and then reaches the positive level of the battery B1 after the voltage and current are detected by the battery protection plate. Subsequently, the current flows out from the negative level of the battery B1, passes through the BMS and D4, and returns to Vin+ to complete a whole charging process. Thus, it can be seen that the positive and negative connections do not affect the charging of the battery by the charger. BRIEF DESCRIPTION OF DRAWINGS
[0015] The application will be further described below in conjunction with the drawings and specific embodiments.
[0016] Figure 1 The circuit schematic diagram of the application. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative efforts are within the protection scope of the application.
[0018] A positive and negative charging protection circuit is connected between a battery and a charger, comprising a protection module, a filter module, a voltage stabilizing module and an indication module. The input of the protection module is the total input of the positive and negative charging protection circuit. The output of the protection module is connected to the input of the filter module. The output of the filter module is connected to the input of the voltage stabilizing module. The output of the voltage stabilizing module is connected to a diode D6 pointing to the battery. The indication module is connected in parallel with the diode D6. The output of the voltage stabilizing module is connected to the positive and negative levels of the battery.
[0019] The protection module comprises diodes D1-D4. The anode of the diode D1 is connected to the cathode of the diode D4. The anode of the diode D2 is connected to the cathode of the diode D3. The cathode of the diode D1 is connected to the cathode of the diode D2. The anode of the diode D4 is connected to the anode of the diode D3. The parallel point of the diode D1 and the diode D2 is the positive output of the protection circuit. The parallel point of the diode D4 and the diode D3 is grounded.
[0020] When the positive and negative levels of the charger output line port are consistent with the positive and negative levels of the battery protection plate input port, the current output by the charger passes through Vin+, D1, and then reaches the positive level of the battery B1 after the voltage and current are detected by the battery protection plate. Subsequently, the current flows out from the negative level of the battery B1, passes through the BMS and D3, and returns to Vin- to complete a whole charging process. When the positive and negative levels of the charger output line port are inconsistent with the positive and negative levels of the battery protection plate input port, the current output by the charger passes through Vin- and D2, and then reaches the positive level of the battery B1 after the voltage and current are detected by the battery protection plate. Subsequently, the current flows out from the negative level of the battery B1, passes through the BMS and D4, and returns to Vin+ to complete a whole charging process. Thus, it can be seen that the positive and negative connections do not affect the charging of the battery by the charger.
[0021] The voltage stabilizing module comprises an inductor L7 and a diode D5, the output of the diode D5 is connected between the inductor L7 and the power supply ground in series, and the cathode of the diode D5 points to the diode D5. The inductor L7 plays a filtering role to remove noise, and the diode D5 can ensure the flow direction of the current.
[0022] The voltage stabilizing module comprises a voltage stabilizer U1, the input of the voltage stabilizer U1 is connected to the output of the filtering module, and the output of the voltage stabilizer U1 is connected with a diode D6, and the diode D6 points to the positive pole of the battery.
[0023] The indicating module comprises a diode LED1 and a diode LED2 connected in parallel, the diodes LED1 and LED2 point in opposite directions, the anode of the diode LED2 is connected to an inductor L13, and the cathode of the diode LED1 is connected to a resistor R7. The indicating module further comprises a triode Q6, the collector of the triode Q6 is connected to the anode of the diode D5 through a resistor R5, the emitter of the triode Q6 is grounded, resistors R11-13 are connected in parallel between the two levels of the battery, and the series connection point of the resistors R12 and R13 is connected to the base of the triode Q6.
[0024] When the battery is in a low power state, the current flows to the battery. When the battery is in a high power state, the potential of the battery is higher or equal to the potential output by the voltage stabilizer U1. At this time, the current flows through the LED2, thereby playing a prompting role.
[0025] This scheme realizes that even if the positive and negative levels of the charger output line port are inconsistent with the positive and negative levels of the battery protection plate input port, the lithium battery charger, the battery protection plate, and the battery pack will not be damaged or cause some safety accidents, such as fire or explosion, due to this reason. Instead, the battery can continue to be normally charged.
[0026] Do not worry about the charger output line port of the positive and negative level and the battery protection plate input port of the positive and negative pole, consistent or not, does not affect the battery charging.
[0027] Embodiments of the application have been described above, with the understanding that these descriptions are exemplary only, and are not intended to be exhaustive or to limit the embodiments disclosed to the precise forms disclosed. Many modifications and variations are possible in light of the above teachings. The embodiments described are meant to be illustrative only and are not intended to limit the scope of the disclosure. The terms used in this document are to be interpreted in their broadest reasonable manner, such that the principles and practical application of the embodiments disclosed can be made available to others skilled in the art. The scope of the application is defined by the appended claims.
Claims
1. A forward / reverse charging protection circuit, the circuit being connected between a battery and a charger, characterized in that, It includes a protection module, a filtering module, a voltage regulator module, and an indicator module. The input of the protection module serves as the total input of the forward and reverse charging protection circuit. The output of the protection module is connected to the input of the filtering module. The output of the filtering module is connected to the input of the voltage regulator module. The output of the voltage regulator module is connected to a diode D6 pointing towards the battery. The indicator module is connected in parallel with the diode D6. The output of the voltage regulator module is connected to the positive and negative terminals of the battery.
2. The forward and reverse charging protection circuit according to claim 1, characterized in that, The protection module includes diodes D1-D4. The anode of diode D1 is connected to the cathode of diode D4, the anode of diode D2 is connected to the cathode of diode D3, the cathode of diode D1 is connected to the cathode of diode D2, and the anode of diode D4 is connected to the anode of diode D3. The parallel connection point of diodes D1 and D2 serves as the positive output of the protection circuit, and the parallel connection point of diodes D4 and D3 is grounded.
3. The forward and reverse charging protection circuit according to claim 1, characterized in that, The voltage regulator module includes an inductor L7, a diode D5, and a Zener diode D7. The inductor L7 and the diode D5 are connected in series, and the output of the diode D5 is connected to the power supply ground. The cathode of the Zener diode points to the diode D5.
4. The forward and reverse charging protection circuit according to claim 1, characterized in that, The voltage regulator module includes a voltage regulator U1. The input of the voltage regulator U1 is connected to the output of the filter module. The output of the voltage regulator U1 is connected to a diode D6, which points to the positive terminal of the battery.
5. The forward and reverse charging protection circuit according to claim 1, characterized in that, The indicating module includes diodes LED1 and LED2 connected in parallel, with LED1 and LED2 pointing in opposite directions.
6. The forward and reverse charging protection circuit according to claim 5, characterized in that, The anode of diode LED2 is connected to inductor L13, and the cathode of diode LED1 is connected to resistor R7.
7. The forward and reverse charging protection circuit according to claim 3, characterized in that, It also includes a transistor Q6, the collector of which is connected to the anode of the diode D5 via a resistor R5, the emitter of the transistor Q6 is grounded, and resistors R11-13 are connected in parallel between the two terminals of the battery. The series connection point of resistors R12 and R13 is connected to the base of the transistor Q6.