Storage battery output under-voltage turn-off protection circuit
By designing a circuit that includes transistors and diodes, the battery voltage is monitored in real time and the output is quickly shut down when the voltage is low. This solves the problem of complex and costly undervoltage shutdown protection circuits in the prior art and achieves fast and reliable protection.
Patent Information
- Application Number
- CN202423319730.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing battery output undervoltage shutdown protection circuits are complex in structure, costly, and have low shutdown efficiency. They cannot monitor and immediately shut down the output in real time, causing equipment to malfunction or damage sensitive components.
The circuit, composed of transistor Q1, resistor Z1, resistor Z2, diode DZ1, capacitor C1, and transistor Q2, monitors the battery voltage in real time. Once the voltage is low, the output circuit is immediately shut down. The power supply is quickly cut off by the cooperation of diode DZ2 and transistor Q1.
It achieves fast and reliable undervoltage shutdown protection, has a simple structure and low cost, is suitable for widespread application, and ensures safe operation of equipment.
Smart Images
Figure CN223942410U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic circuits, and in particular to a battery output undervoltage shutdown protection circuit. Background Technology
[0002] Battery output undervoltage refers to a situation where the voltage supplied by the battery is lower than its nominal voltage or the minimum operating voltage required by the load. This situation may cause equipment relying on the battery to malfunction or even damage certain sensitive electronic components. However, existing battery output undervoltage shutdown protection circuits are generally complex in structure, expensive, have low shutdown efficiency, slow shutdown action, cannot monitor battery voltage in real time, and cannot immediately shut down the output when the battery is undervoltage.
[0003] The above problems urgently need to be solved. Utility Model Content
[0004] In view of this, the present invention provides a battery output undervoltage shutdown protection circuit to solve the problems mentioned in the background section above.
[0005] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:
[0006] This utility model embodiment provides a battery output undervoltage shutdown protection circuit, which includes: transistor Q1, resistor Z1, resistor Z2, diode DZ1, capacitor C1, transistor Q2, resistor Z3, resistor Z4, resistor Z5, resistor Z6, diode DZ2, resistor Z7, resistor Z8, diode D1, and diode D2; wherein, the base of transistor Q1 is connected to one end of resistor Z6 and one end of resistor Z5, the other end of resistor Z5 is connected to the anode of diode DZ1, the cathode of diode DZ1 is connected to the anode of diode D1, and the other end of resistor Z6 is connected to the collector of transistor Q1, the anode of resistor DZ2, and one end of resistor Z1. One end of resistor Z3 is connected to the other end of resistor Z1, one end of capacitor C1, one end of diode DZ2, and one end of resistor Z4. The other end of capacitor C1 is connected to one end of resistor Z2, the negative terminal of diode D1, and the negative terminal of diode DZ1. One end of resistor Z2 is grounded to GND. The other end of resistor Z4 is connected to the negative terminal of diode D2. The positive terminal of diode D2 is connected to the drain of transistor Q2. The source of transistor Q2 is connected to one end of resistor Z7 and then to the positive terminal BAT+ of the battery. The other end of resistor Z7 is connected to the gate of transistor Q2, one end of resistor Z8, and the other end of resistor Z8 is connected to the emitter of transistor Q1.
[0007] Preferably, both diodes DZ1 and DZ2 are Zener diodes.
[0008] Preferably, the transistor Q1 is, but is not limited to, an NPN transistor.
[0009] Preferably, the transistor Q2 is, but is not limited to, a MOSFET.
[0010] In normal operation, the battery BAT+ supplies power to the load V0+ through transistor Q2 and diode D2. If the battery discharges excessively, the output circuit is shut down by sampling via resistors Z4, Z1, Z3, and diode DZ2. Diode DZ2 is then turned off, and a control signal is sent through diode DZ1, resistor Z5, and transistor Q1 to pull down the gate level of transistor Q2. This invention can monitor the battery voltage in real time and immediately shut down the output when undervoltage occurs, effectively protecting the battery. It features fast response, stability, reliability, simple structure, low cost, and suitability for widespread application. Attached Figure Description
[0011] To more clearly illustrate and understand the technical solutions in the embodiments of this utility model, the accompanying drawings used in the background technology and embodiment description of this utility model will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0012] Figure 1 This is a structural diagram of a battery output undervoltage shutdown protection circuit provided in an embodiment of the present invention. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0014] like Figure 1 As shown, Figure 1 This is a structural diagram of a battery output undervoltage shutdown protection circuit provided in an embodiment of the present invention.
[0015] This embodiment provides an output overvoltage input protection circuit with a locking function. The circuit includes a transistor Q1, resistors Z1 and Z2, a diode DZ1, a capacitor C1, transistor Q2, resistors Z3, Z4, Z5, and Z6, diodes DZ2, Z7, and Z8, diode D1, and diode D2. The base of transistor Q1 is connected to one end of resistor Z6 and one end of resistor Z5. The other end of resistor Z5 is connected to the anode of diode DZ1. The cathode of diode DZ1 is connected to the anode of diode D1. The other end of resistor Z6 is connected to the collector of transistor Q1, the anode of resistor DZ2, and one end of resistor Z1. One end of resistor Z3 is connected to the battery. The other end of resistor Z3 is connected to the other end of resistor Z1, one end of capacitor C1, one end of diode DZ2, and one end of resistor Z4. The other end of capacitor C1 is connected to one end of resistor Z2, the cathode of diode D1, and the cathode of diode DZ1. One end of resistor Z2 is grounded to GND. The other end of resistor Z4 is connected to the cathode of diode D2. The anode of diode D2 is connected to the drain of transistor Q2. The source of transistor Q2 is connected to one end of resistor Z7 and then to the positive terminal BAT+ of the battery. The other end of resistor Z7 is connected to the gate of transistor Q2 and one end of resistor Z8. The other end of resistor Z8 is connected to the emitter of transistor Q1.
[0016] In this embodiment, both diodes DZ1 and DZ2 are Zener diodes. In this embodiment, transistor Q1 is, but is not limited to, an NPN transistor. In this embodiment, transistor Q2 is, but is not limited to, a MOSFET.
[0017] During normal operation, the battery BAT+ supplies power to the load V0+ through transistor Q2 and diode D2. If the battery over-discharges, the output circuit is shut down by sampling via resistors Z4, Z1, Z3, and diode DZ2. Diode DZ2 is then turned off, and a control signal is sent through diode DZ1, resistor Z5, and transistor Q1 to pull down the gate level of transistor Q2. This invention can monitor the battery voltage in real time and immediately shut down the output when undervoltage occurs, effectively protecting the battery. It features fast response, stability, reliability, simple structure, low cost, and suitability for widespread application.
[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A battery output undervoltage shutdown protection circuit, characterized in that, include: The following components are included: transistor Q1, resistors Z1 and Z2, diode DZ1, capacitor C1, transistor Q2, resistors Z3, Z4, Z5, and Z6, diodes DZ2, Z7, and Z8, diode D1, and diode D2. The base of transistor Q1 is connected to one end of resistor Z6 and one end of resistor Z5. The other end of resistor Z5 is connected to the anode of diode DZ1. The cathode of diode DZ1 is connected to the anode of diode D1. The other end of resistor Z6 is connected to the collector of transistor Q1, the anode of resistor DZ2, one end of resistor Z1, and one end of resistor Z3. The other end of resistor Z3... One end of the resistor is connected to the other end of resistor Z1, one end of capacitor C1, one end of diode DZ2, and one end of resistor Z4. The other end of capacitor C1 is connected to one end of resistor Z2, the negative terminal of diode D1, and the negative terminal of diode DZ1. One end of resistor Z2 is grounded to GND. The other end of resistor Z4 is connected to the negative terminal of diode D2. The positive terminal of diode D2 is connected to the drain of transistor Q2. The source of transistor Q2 is connected to one end of resistor Z7 and then to the positive terminal BAT+ of the battery. The other end of resistor Z7 is connected to the gate of transistor Q2 and one end of resistor Z8. The other end of resistor Z8 is connected to the emitter of transistor Q1.
2. The battery output undervoltage shutdown protection circuit according to claim 1, characterized in that, Both diodes DZ1 and DZ2 are Zener diodes.
3. The battery output undervoltage shutdown protection circuit according to any one of claims 1 or 2, characterized in that, The transistor Q1 is, but is not limited to, an NPN transistor.
4. The battery output undervoltage shutdown protection circuit according to claim 3, characterized in that, The transistor Q2 is, but is not limited to, a MOSFET.