Hardware overvoltage redundancy protection self-locking circuit

Abstract

The invention belongs to the field of generator controller protection functions, and relates to a hardware overvoltage redundancy protection self-locking circuit. Comprising an overvoltage protection main circuit and a self-locking protection circuit. The overvoltage protection main circuit comprises a voltage division sub-circuit, a following sub-circuit, an integration sub-circuit, a comparison sub-circuit and a self-locking signal generation sub-circuit. Three-phase voltage regulating point voltage sequentially passes through the voltage dividing sub-circuit, the following sub-circuit, the integration sub-circuit and the comparison sub-circuit, and then a voltage value UO3 is output. The connection relation of the self-locking signal generation sub-circuit is as follows: a voltage source, a resistor R13, a resistor R14 and a resistor R15 are sequentially connected in series, and the resistor R15 is grounded; the voltage UO3 is connected between the resistor R13 and the resistor R14; a first self-locking signal OVLOCK is led out between the resistor R14 and the resistor R15 and is transmitted to the self-locking protection circuit; a second self-locking signal OVLOCK1 is led out from the position between the resistor R13 and the resistor R14 and is input to the positive end of a comparator A4, and the negative end of the comparator A4 is connected with the reference voltage through a resistor R17; and the output end of the comparator A4 directly outputs a locking state signal OVSTATE.

Description

technical field [0001] The invention relates to the field of generator controller protection functions, and relates to a hardware overvoltage redundant protection self-locking circuit. Background technique [0002] In the power supply system, the overvoltage fault is the most harmful to the electrical load and the power supply system itself. Therefore, in the design process of the generator controller, the hardware overvoltage protection circuit provides redundant overvoltage protection for the controller through the hardware circuit to ensure that when the generator controller is designed When the software-based overvoltage protection function fails, the system still has the overvoltage protection capability. The hardware overvoltage protection performs the protection function by not relying on the voltage regulation point voltage (used for voltage control and voltage protection) collected and calculated by the CPU. When the software overvoltage protection of the controlle...

AI Technical Summary

Problems solved by technology

At this time, there is no protection action for the excitation circuit. When the voltage returns to the normal range, the overvoltage protection circuit will turn over and output a high level again, and the relay controlled by the FET will automatically pull in. In the case of unclear faults and no reset The lower main contactor will automatically restore the connection, and there are certain risks and hidden dangers

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