Hysteresis type power supply circuit

Abstract

The invention discloses a hysteresis type power supply circuit, which comprises an input circuit, a switch combination circuit, a sampling and controlling circuit, a feedback circuit and an output circuit. The input circuit is connected to the input end of a power supply, rectifies the power input and provides isolation protection for the input end. The switch combination circuit is connected to the input circuit, turns on or turns off the input circuit to control the output power from the output end of the power source. The sampling and controlling circuit samples the output voltage, compares the output voltage with the reference voltage, and controls the opening and closing of the switch combination circuit according to the comparison result. The feedback circuit is arranged between the switch combination circuit and the sampling and controlling circuit. The switch combination circuit outputs positive feedback signals to the sampling and controlling circuit through the feedback circuit. The positive feedback signals cause a hysteretic effect of the comparison action of a reference power supply chip. The output circuit is connected to the switch combination circuit so as to filter the output of the switch combination circuit and to provide isolation protection for the output end and the output of the output circuit is used as the output of the hysteresis type power supply circuit.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, and more specifically, to a power circuit for powering a circuit breaker. Background technique [0002] With the continuous progress of the low-voltage electrical industry, plastic case circuit breakers (molded case circuit breakers) are becoming more intelligent, and communication is constantly developing. The intelligence of the molded case circuit breaker is mainly realized by electronic devices, therefore, a power circuit for powering the element and the circuit breaker is also required. The reliability and stability of the intelligent controller are inseparable from the improvement of the performance and reliability of the power circuit. At the same time, because the power circuit is converted between strong and weak current circuits, it is prone to problems such as overvoltage, overcurrent, breakdown, and electromagnetic interference. It is urgent to improve its stability a...

AI Technical Summary

Problems solved by technology

In this scheme, three series resistors are used as voltage divider resistors, which makes the calculation more complicated, and an auxiliary DC power supply must also be used

[0007] In short, there are common problems in the prior art, such as complex circuits, large volume, many devices, complicated calculation process, and high cost.

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