Constant current and voltage circuit

Abstract

The invention discloses a constant current and voltage circuit. The constant current and voltage circuit comprises a reference voltage source circuit, a resistance voltage dividing current voltage detection circuit, a comparison amplifying circuit, a current voltage difference output circuit, a photoelectric isolating feedback circuit, a power supply integration pulse width regulating circuit, a transistor switching circuit, a switch transformer, a rectifier and filter circuit, a transistor switch output circuit and an output filter circuit which are sequentially connected. A resistor-capacitor (RC) integrating feedback circuit is connected between the comparison amplifying circuit and the current voltage difference output circuit, an accuracy fine tuning circuit is connected onto the resistance voltage dividing current voltage detection circuit, the reference voltage source circuit is connected with the rectifier and filter circuit, and one end of the output filter circuit is connected with an output terminal and the resistance voltage dividing current voltage detection circuit. The constant current and voltage circuit has the advantages of being high in anti-interference capability, capable of stabilizing, detecting and controlling voltage; and avoiding out-of-control and halting phenomena.

Description

technical field [0001] The invention relates to a constant current and constant voltage circuit. Background technique [0002] Now the charger is widely used, and the quality requirements of the charger are getting higher and higher. If the charger is overcharged during actual use, it will have a great impact on the quality and safety hazards of the charger itself. In severe cases, it will generate heat and explode. Therefore, many designers usually use single-chip microcomputers to control and control when designing chargers. Detect the voltage level to protect the charger from overcharging, but the MCU program belongs to the software category. In actual use, the MCU has poor anti-interference ability, easily loses control, or even crashes, so the charger cannot be protected. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a constant current and constant voltage circuit capable of stabilizing voltage and well d...

AI Technical Summary

Problems solved by technology

If the charger is overcharged during actual use, it will have a great impact on the quality of the charger itself and potential safety hazards. In severe cases, it will generate heat and explode. Therefore, many designers usually use single-chip microcomputers to control and control when designing chargers. Detect the voltage level to protect the charger from overcharging, but the single-chip microcomputer program belongs to the software category. In actual use, the single-chip microcomputer has poor anti-interference ability, easy to lose control, or even crash, so the charger cannot be protected.

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