Hysteretic power supply circuit

Abstract

The invention discloses a hysteresis power supply circuit, comprising: an input circuit, a switch combination circuit, a sampling and control circuit, a feedback circuit and an output circuit. An input circuit is connected to the power input, rectifies the power input and provides isolation protection for the input. The switching combination circuit is connected to the input circuit, and is turned on or off to control the output power at the output terminal of the power supply. The sampling and control circuit samples the output voltage and compares the output voltage with the reference voltage, and controls the switch combination circuit to be turned on or off according to the comparison result. The feedback circuit is connected between the switch combination circuit and the sampling and control circuit, the switch combination circuit outputs a positive feedback signal to the sampling and control circuit through the feedback circuit, and the positive feedback signal makes the comparison action of the reference power chip produce a hysteresis effect. The output circuit is connected to the switch combination circuit, filters the output of the switch combination circuit and provides isolation protection for the output terminal, and its output is used as the output of the hysteresis power supply circuit.

Description

technical field [0001] The present invention relates to the field of low-voltage electrical appliances, and more particularly, to a power supply circuit for supplying power to circuit breakers. Background technique [0002] With the continuous progress of the low-voltage electrical industry, the plastic case circuit breaker (molded case circuit breaker) is becoming intelligent, and the communication is constantly developing. The intelligence of the molded case circuit breaker is mainly realized by electronic devices, therefore, the power supply circuit for the element and the circuit breaker is also required. The reliability and stability of the intelligent controller cannot be separated from the improvement of the performance and reliability of the power circuit. At the same time, the power supply circuit is prone to overvoltage, overcurrent, breakdown, electromagnetic interference and other problems due to the conversion between strong and weak current circuits. It is urg...

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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