A power supply protection circuit

Abstract

The invention relates to an energy supply protection circuit. The energy supply protection circuit comprises a circuit input port used for connecting an energy supply circuit, a circuit output port used for connecting a load, a power switch connected in series between the circuit input port and the circuit output port, and a power switch control circuit, wherein the power switch control circuit isin control connection with the power switch, a voltage sampling circuit, a voltage integral operation amplifying circuit and a controller are further comprised, the voltage sampling circuit is in sampling connection with the circuit output port and is used for obtaining the voltage of the circuit output port, a signal output end of the voltage sampling circuit is connected with an input end of the voltage integral operation amplifying circuit, an output end of the voltage integral operation amplifying circuit is connected with the power switch control circuit, and the controller is connectedwith the input end and the output end of the voltage integral operation amplifying circuit. The energy supply protection circuit is advantaged in that through controlling the conduction degree of thepower switch connected in series between the energy supply circuit and the load, so the purpose of stabilizing and limiting the output voltage of the energy supply circuit is achieved, and the load iseffectively protected.

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

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