A low voltage protection circuit suitable for lead-acid batteries
By designing a hardware circuit including transistor Q1 and voltage comparator U1, the problem that lead-acid batteries cannot achieve factory low voltage protection is solved, and low-cost and easy-to-combust low voltage protection function is achieved.
Patent Information
- Application Number
- CN202421276487.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-05
AI Technical Summary
Lead-acid batteries cannot achieve factory low voltage protection, and the detection cost using a microcontroller is high and debugging is difficult.
A low voltage protection circuit including transistor Q1 and voltage comparator U1 is designed to realize low voltage protection of the battery through a hardware circuit.
It realizes low-voltage protection function, reduces costs, simplifies the debugging process, and is suitable for lead-acid battery products.
Smart Images
Figure CN222735800U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a protection circuit, in particular to a low-voltage protection circuit suitable for a lead-acid battery. Background Art
[0002] Due to structural reasons, lead-acid batteries cannot be fixed with PCBA, and the low-voltage protection function cannot be realized when leaving the factory, so they cannot be used directly. If the lead-acid battery is not protected against low voltage during discharge, the battery life will be shortened and the battery will be easily scrapped. A single-chip microcomputer detection can be added for low-voltage protection, but the cost is high, debugging is difficult, and it is easy to make mistakes. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide a low-voltage protection circuit suitable for lead-acid batteries, which uses hardware circuit design, has low cost, is easy to debug, and is suitable for lead-acid battery products.
[0004] In order to solve the above technical problems, the technical solution of the utility model is: a low-voltage protection circuit suitable for lead-acid batteries, including a transistor Q1 and a voltage comparator U1, the battery power VCC is connected to the positive input terminal of the voltage comparator U1 through resistors R41 and R42 in sequence, the battery power VCC is connected to the negative input terminal of the voltage comparator U1 through resistor R39, the positive input terminal of the voltage comparator U1 is grounded through resistor R43, the negative input terminal of the voltage comparator U1 is grounded through a voltage stabilizing diode D1, the battery power VCC is connected to the anode of the diode D2 through resistor R38, the output terminal of the voltage comparator is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the base of the transistor Q1, the base of the transistor is grounded after passing through diodes D3 and D4 in sequence, the emitter of the transistor Q1 is grounded through resistor R12, and the collector of the transistor Q1 is connected to a relay that controls the power supply end of the battery power VCC. The principle of the utility model is as follows: when the battery is discharged at a voltage higher than the normal voltage, the voltage at the positive input terminal of the voltage comparator U1 is higher than the negative input terminal, the output terminal of the voltage comparator U1 outputs a high level, the transistor Q1 is turned on, and the whole machine works; when the battery is discharged at a voltage lower than the normal voltage, the voltage at the positive input terminal of the voltage comparator U1 is lower than the negative input terminal, the output terminal of the voltage comparator U1 outputs a low level, the transistor Q1 is turned off, and the whole machine shuts down, thereby realizing low-voltage protection for the battery.
[0005] Compared with the prior art, the utility model has the following beneficial effects:
[0006] The utility model does not need single chip microcomputer control, uses hardware circuit design, has low cost, is convenient for debugging, and is suitable for lead-acid battery products. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 This is the circuit schematic diagram of the utility model.
[0008] Figure 2 This is the schematic diagram of the power amplifier charging circuit. DETAILED DESCRIPTION
[0009] The utility model will be further described below in conjunction with the accompanying drawings.
[0010] like Figure 1 , 2 As shown, a low-voltage protection circuit suitable for a lead-acid battery includes a transistor Q1 and a voltage comparator U1. The battery power supply VCC is connected to the positive input terminal of the voltage comparator U1 through resistors R41 and R42 in sequence, the battery power supply VCC is connected to the negative input terminal of the voltage comparator U1 through resistor R39, the positive input terminal of the voltage comparator U1 is grounded through resistor R43, the negative input terminal of the voltage comparator U1 is grounded through a voltage stabilizing diode D1, the battery power supply VCC is connected to the anode of the diode D2 through resistor R38, the output terminal of the voltage comparator is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the base of the transistor Q1, the base of the transistor is grounded through diodes D3 and D4 in sequence, the emitter of the transistor Q1 is grounded through resistor R12, and the collector of the transistor Q1 is connected to a relay that controls the power supply terminal of the battery power supply VCC. The principle of the utility model is as follows: when the battery is discharged at a voltage higher than the normal voltage, the voltage at the positive input terminal of the voltage comparator U1 is higher than the negative input terminal, the output terminal of the voltage comparator U1 outputs a high level, the transistor Q1 is turned on, and the whole machine works; when the battery is discharged at a voltage lower than the normal voltage, the voltage at the positive input terminal of the voltage comparator U1 is lower than the negative input terminal, the output terminal of the voltage comparator U1 outputs a low level, the transistor Q1 is turned off, and the whole machine shuts down, thereby realizing low-voltage protection for the battery.
Claims
1. A low voltage protection circuit suitable for lead-acid batteries, characterized in that: It includes a transistor Q1 and a voltage comparator U1. The battery power supply VCC is connected to the positive input terminal of the voltage comparator U1 through resistors R41 and R42 in sequence. The battery power supply VCC is connected to the negative input terminal of the voltage comparator U1 through resistor R39. The positive input terminal of the voltage comparator U1 is grounded through resistor R43. The negative input terminal of the voltage comparator U1 is grounded through a voltage stabilizing diode D1. The battery power supply VCC is connected to the anode of the diode D2 through resistor R38. The output terminal of the voltage comparator is connected to the anode of the diode D2. The cathode of the diode D2 is connected to the base of the transistor Q1. The base of the transistor is grounded after passing through diodes D3 and D4 in sequence. The emitter of the transistor Q1 is grounded through resistor R12. The collector of the transistor Q1 is connected to a relay that controls the power supply terminal of the battery power supply VCC.