A power supply protection circuit

Abstract

The invention relates to an energy supply protection circuit, which includes a circuit input port for connecting an energy supply circuit, a circuit output port for connecting a load, a power switch arranged in series between the circuit input port and the circuit output port, and a power switch. The control circuit, the power switch control circuit controls and connects the power switch; it also includes a voltage sampling circuit, a voltage integrating operational amplifier circuit and a controller; the voltage sampling circuit sampling connection circuit output port is used to obtain the circuit output port voltage, and the signal output end of the voltage sampling circuit The input terminal of the voltage integral operational amplifier circuit is connected, the output terminal of the voltage integral operational amplifier circuit is connected to the power switch control circuit, and the controller is connected to the input terminal and the output terminal of the voltage integral operational amplifier circuit. The invention achieves the purpose of stabilizing and limiting the output voltage of the energy supply circuit by controlling the conduction degree of the power switch connected in series between the energy supply circuit and the load, and effectively protects the load.

Description

technical field [0001] The invention relates to an energy supply protection circuit, which belongs to the technical field of direct current transmission. Background technique [0002] The core device of the high-voltage DC circuit breaker is the power electronic device. In practical applications, the power electronic device forms a power electronic module, and the power electronic module realizes high potential through series connection. Each power electronic module needs to have its corresponding driving circuit, and the driving circuit and the power electronic module are directly connected electrically and are at the same potential. If the drive circuit wants to obtain energy, it can only obtain energy at a high level, or supply energy from a low potential through isolation. [0003] For high-voltage DC circuit breakers, because the capacitor of a single power electronic module does not store energy when it is closed, it cannot achieve high-level self-energy extraction, a...

AI Technical Summary

Problems solved by technology

[0005] 1. The peak current and voltage of the energy supply module due to insufficient adjustment rate will damage the subsequent control circuit;

[0006] 2. The output adjustment rate of the energy supply module is too low, resulting in a voltage drop when the load of the power electronic module changes rapidly;

[0007] 3. The energy supply module is damaged due to short circuit when the load control circuit of the power electronic module is out of control;

[0008] 4. Due to the lack of targeted on-site parameter setting capabilities of the general energy supply circuit, the output characteristics are poorly consistent when the load changes suddenly;

[0009] 5. When the internal control voltage stabilization circuit of the existing energy supply module fails, due to its current source characteristics, there is an abnormal increase in the output voltage when the load is low or no load, causing a risk of voltage breakdown to the load

Images