Voltage stabilizing circuit of switching power supply

Abstract

The invention belongs to the technical field of electronics, and provides a voltage stabilizing circuit of a switching power supply. The voltage stabilizing circuit of the switching power supply is provided with a switching power supply control chip IC (2). An error amplifier, a PWM controller and an 800 V avalanche breakdown high-voltage MOS transistor are arranged in the switching power supply control chip IC (2). The input end and the output end of the switching power supply control chip IC (2) are connected with an input rectifier and filter circuit (1) and an output filter protection circuit (6) respectively. The voltage stabilizing circuit of the switching power supply further comprises a boot-strap circuit (5) and a feedback network circuit (4). The feedback network circuit (4) is connected with a feedback pin FB of the switching power supply control chip IC (2). The voltage of the feedback pin FB and an internal reference voltage Vref are used as the reverse-phase input and the same-phase input of the error amplifier in the switching power supply control chip IC respectively. The voltage stabilizing circuit of the switching power supply has the advantages of being high in power switching efficiency, simple in circuit, low in fault rate and the like.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a switching power supply voltage stabilizing circuit. Background technique [0002] With the rapid development of power electronics technology, the relationship between power electronic equipment and people's work and life is becoming increasingly close, and electronic equipment is inseparable from a reliable power supply. A power supply is a device that provides power to electronic equipment, also known as a power supply, which provides the electrical energy required by all electronic components in electronic equipment. The size of the power supply, whether the current and voltage are stable will directly affect the working performance and service life of electronic equipment. [0003] The power supply voltage stabilization circuits currently on the market are mainly linear DC power supplies and high-frequency switching power supplies. Among them, ...

AI Technical Summary

Problems solved by technology

Among them, the linear power supply technology is very mature, the production cost is low, it can achieve high stability, the ripple is small, and its own interference and noise are relatively small, but because the volume of the linear DC power supply working at industrial frequency (50Hz) transformer is relatively small Large, low efficiency (generally the efficiency of full-load work is only about 80%), serious heat generation, large overall volume and bulky, and high requirements for input voltage range; and high-frequency switching power supply has small size and power consumption, but high efficiency High, light weight, wide range of voltage regulation, etc.; but the circuit structure is complex, the failure rate is high, maintenance is troublesome, and there are serious switching interferences

Images