CN206806989U - A kind of battery charging detection protection circuit - Google Patents

Abstract

The utility model discloses a storage battery charging detection protection circuit, which comprises a switch S1, a rectifier bridge T, a capacitor C1 and a chip IC1, one end of the resistor R1 is connected to the capacitor C1 and 220V alternating current, and the other end of the resistor R1 is connected to the other end of the capacitor C1 and the Port 1 of the rectifier bridge T, port 2 of the rectifier bridge T are connected to pin 6 of the switch S1, and port 4 of the rectifier bridge T is connected to the resistor R1, resistor R2, capacitor C2, the cathode of the diode D2 and the cathode of the battery E. The battery charging detection and protection circuit of the utility model is combined with a capacitor and a voltage comparator, and only uses a small amount of electronic components. By detecting the battery voltage, it realizes the time control of the charging process and effectively avoids the phenomenon of overcharging. Therefore, it has the advantages of saving electric energy, low cost and long service life.

Description

A storage battery charging detection protection circuit

technical field

The utility model relates to the technical field of storage batteries, in particular to a storage battery charging detection protection circuit.

Background technique

Rechargeable batteries are a common item in people's daily life. Many portable mobile devices use rechargeable batteries, and the batteries themselves have a certain number of charge and discharge times. Generally, the service life of batteries is only 2 to 3 years. Therefore, after the battery is fully charged , if you cannot unplug the charger or turn off the power in time, it will not only cause a great waste of electric energy, but also greatly reduce the service life of the battery. Secondly, many people are used to taking away the charging load after using the charger and forget to unplug it. Disconnecting the charger also causes a waste of electric energy. Most smart chargers on the market use the trickle charging mode, which not only has a complex structure, but also consumes a lot of power, which is not conducive to energy conservation and environmental protection.

Utility model content

The purpose of this utility model is to provide a storage battery charging detection and protection circuit to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the utility model provides the following technical solutions:

A battery charging detection protection circuit, including a switch S1, a rectifier bridge T, a capacitor C1 and a chip IC1, one end of the resistor R1 is connected to the capacitor C1 and 220V AC, and the other end of the resistor R1 is connected to the other end of the capacitor C1 and the port of the rectifier bridge T 1. Port 2 of rectifier bridge T is connected to pin 6 of switch S1, port 4 of rectifier bridge T is connected to resistor R1, resistor R2, capacitor C2, cathode of diode D2 and negative pole of battery E, pin 5 of switch S1 is connected to capacitor C2, Pin 1 of switch S1 is connected to pin 2 of switch S1, pin 3 of switch S1 is connected to resistor R3 and the emitter of transistor V3, pin 4 of switch S1 is connected to the anode of diode D1, the other end of resistor R1 and pin 3 of chip IC1 , the other end of resistor R3 is connected to the other end of resistor R2 and pin 1 of chip IC1, pin 4 of chip IC1 is connected to resistor R4, the other end of resistor R4 is connected to the base of transistor V2, and the collector of transistor V2 is connected to resistor R5 , the other end of the resistor R5 is connected to the base of the triode V1, and the emitter of the triode V2 is connected to the anode of the diode D2.

As a preferred solution of the present invention: the diode D2 is a light emitting diode.

As a preferred solution of the utility model: the model of the chip IC1 is LM339.

As a preferred solution of the present utility model: the triode V1 is a P-type triode, and the triode V2 is an N-type triode.

As a preferred solution of the present utility model: the chip IC1, the resistor R3 and the resistor R2 form a voltage detection module.

Compared with the prior art, the beneficial effect of the utility model is: the battery charging detection and protection circuit of the utility model is combined with a capacitor and a voltage comparator, and only uses a small number of electronic components, and realizes charging by detecting the battery voltage. The time control of the process can effectively avoid the phenomenon of overcharging. Therefore, it has the advantages of saving electric energy, low cost and long service life.

Description of drawings

Figure 1 is a circuit diagram of the battery charging detection protection circuit.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figure 1, a battery charging detection protection circuit, including a switch S1, a rectifier bridge T, a capacitor C1 and a chip IC1, one end of the resistor R1 is connected to the capacitor C1 and 220V AC, and the other end of the resistor R1 is connected to the other end of the capacitor C1 One end is connected to port 1 of rectifier bridge T, port 2 of rectifier bridge T is connected to pin 6 of switch S1, port 4 of rectifier bridge T is connected to resistor R1, resistor R2, capacitor C2, cathode of diode D2 and negative electrode of battery E, switch S1 Pin 5 of switch S1 is connected to capacitor C2, pin 1 of switch S1 is connected to pin 2 of switch S1, pin 3 of switch S1 is connected to resistor R3 and the emitter of transistor V3, pin 4 of switch S1 is connected to the anode of diode D1 and the other end of resistor R1 And the pin 3 of the chip IC1, the other end of the resistor R3 is connected to the other end of the resistor R2 and the pin 1 of the chip IC1, the pin 4 of the chip IC1 is connected to the resistor R4, and the other end of the resistor R4 is connected to the base of the transistor V2, the transistor The collector of V2 is connected to the resistor R5, the other end of the resistor R5 is connected to the base of the transistor V1, and the emitter of the transistor V2 is connected to the anode of the diode D2.

Diode D2 is a light emitting diode. The model of chip IC1 is LM339. The transistor V1 is a P-type transistor, and the transistor V2 is an N-type transistor. Chip IC1, resistor R3 and resistor R2 form a voltage detection module.

The working principle of the utility model is: after the 220V mains is stepped down by the resistance-capacitance step-down circuit composed of the resistor R1 and the capacitor C1, it is rectified and outputted through the rectifier bridge T, and when the switch S1 is set to "off" (1 in the figure , 2, 5, and 6 feet are connected), the DC voltage output from the rectifier bridge T charges the capacitor C2. Make the voltage across C2 equal to the battery voltage. When S1 is set to "on" (pins 3, 4, 5, and 6 are connected in the figure), capacitor C2 is connected to pin 3 of the non-inverting input terminal of chip IC1 of the operational amplifier, and C1 is also discharged through R1 at the same time. R2 and R3 form a voltage divider circuit and add it to pin 1 of the inverting input terminal of the chip IC1. When the voltage is turned on, the voltage of pin 3 of the chip IC1 is higher than that of pin 1, and the chip IC1 outputs a high level. Therefore, both the triode V1 and the triode V2 are turned on, and the battery E is charged through the output voltage of the collector of V1, and the light-emitting diode D2 is lit at the same time. As the charging progresses, the capacitor C1 discharges continuously, and the voltage of the pin 3 of the chip IC1 keeps dropping. When the voltage of the pin 3 of the chip IC1 is lower than the voltage of the pin 1 of the chip IC1, the output of the chip IC1 is low, and V1 and V2 are cut off one after another. Charging, D2 goes out, so as to achieve the purpose of timing charging.

Claims (5)

1. a kind of battery charging detection protection circuit, including switch S1, rectifier bridge T, electric capacity C1 and chip IC 1, its feature exist In resistance R1 one end connection electric capacity C1 and 220V alternating current, the resistance R1 other end connects electric capacity the C1 other end and rectification Bridge T port 1, the rectifier bridge T connecting valve S1 of port 2 pin 6, rectifier bridge T port 4 connect resistance R1, resistance R2, electric capacity C2, diode D2 negative electrode and battery E negative pole, the pin 5 for switching S1 connect electric capacity C2, switch the S1 connecting valve S1 of pin 1 Pin 2, the pin 3 for switching S1 connects resistance R3 and triode V3 emitter stage, switch S1 pin 4 connect diode D1 anode, The resistance R1 other end and the pin 3 of chip IC 1, the resistance R3 other end connection resistance R2 other end and drawing for chip IC 1 Pin 1, the pin 4 of chip IC 1 connect resistance R4, resistance R4 other end connecting triode V2 base stage, triode V2 current collection Pole connects resistance R5, resistance R5 other end connecting triode V1 base stage, and triode V2 emitter stage connects diode D2's Anode.

2. a kind of battery charging detection protection circuit according to claim 1, it is characterised in that the diode D2 is Light emitting diode.

3. a kind of battery charging detection protection circuit according to claim 1, it is characterised in that the chip IC 1 Model LM339.

4. a kind of battery charging detection protection circuit according to claim 1, it is characterised in that the triode V1 is P-type triode, triode V2 are N-type triodes.

A kind of 5. battery charging detection protection circuit according to claim 1 or 3, it is characterised in that the chip IC1, resistance R3 and resistance R2 composition voltage detection modules.