Protection circuit of storage capacitor

Abstract

The invention provides a protection circuit of a storage capacitor, and relates to the electricity field. The protection circuit is used for solving the protection problem of a high-capacity storage capacitor, and comprises a rectifying circuit and the storage capacitor, wherein the rectifying circuit is connected with an alternating current (AC) input end; the storage capacitor is connected with an direct current (DC) output end; an overvoltage protection circuit for the storage capacitor is connected between the rectifying circuit and the storage capacitor in parallel and comprises a relay with a normally open contact and a normally closed contact, a first voltage-regulator diode, a second voltage-regulator diode and a current-limiting resistor; the normally closed contact of the relay is connected between the output of the rectifying circuit and the positive pole of the storage capacitor in series; the normally open contact of the relay is connected with a circuit in series, and the circuit comprises the current-limiting resistor and the second voltage-regulator diode; the first voltage-regulator diode is connected with a circuit in parallel, and the circuit comprises the current-limiting resistor and the normally open contact of the relay; the positive pole of the second voltage-regulator diode is connected with the current-limiting resistor and the negative pole of the first voltage-regulator diode; and the negative pole is connected with the positive pole of the storage capacitor. The protection circuit can realize the overvoltage protection for the storage capacitor.

Description

technical field [0001] The present invention relates to an energy storage capacitor, and further relates to a protection circuit for the energy storage capacitor. Background technique [0002] At present, in the operating mechanism of the power distribution network, the operating power is generally DC. Since the moment of operation of the operating mechanism requires a lot of energy (several amperes or even tens of amperes), large-capacity energy storage capacitors are often used to store the required energy. , the traditional implementation method is to charge the capacitor directly after rectifying the AC power. Since no necessary protection circuit is added, when the capacitor is charged, the current is very large, which may easily cause the circuit breaker to trip by mistake; when the operating mechanism is stuck or even short-circuited, It is easy to burn out the rectifier circuit; and when the voltage rises abnormally and exceeds the rated voltage of the capacitor, the...

AI Technical Summary

Problems solved by technology

[0002]At present, in the power distribution network operating mechanism, the operating power supply is generally DC, because the moment the operating mechanism operates requires a lot of energy (several amperes or even tens of amperes ), large-capacity energy storage capacitors are often used to store the required energy. The traditional implementation method is to charge the capacitor directly after rectifying the alternating current. Since the necessary protection circuit is not added, when the capacitor is charged, the current is very large, which is easy to cause The circuit breaker accidentally trips; when the operating mechanism is stuck or even short-circuited, it is easy to burn out the rectifier circuit; and when the voltage rises abnormally beyond the rated voltage of the capacitor, there may be vicious accidents such as capacitor discharge or even explosion

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