Security apparatus for power converter

Details Security apparatus for power converter Security apparatus for power converter

1987-11-19

1989-04-04

Tolin, Gerald P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 86, 361 87, 307 87, 363 56, H02H 326

Patent

active

048191213

ABSTRACT:
A security apparatus adapted to a power converter, including a power converting circuit connected between a DC power source and an AC system; a phase detector circuit for detecting the voltage phase of the AC system to provide a phase detection signal; a reference signal generator circuit for generating a voltage reference in accordance with the phase detection signal; a control circuit for controlling an output voltage of the power converting circuit in accordance with the voltage reference. The security apparatus is characterized by a disturbance generator circuit for applying a disturbance to the phase detector circuit; and a detector circuit for detecting an abnormal state in which the phase or frequency of the output voltage of the power converting circuit deviates from a normal one.

REFERENCES:
patent: 4330816 (1982-05-01), Imazeki
patent: 4366389 (1982-12-01), Hussey
patent: 4443709 (1984-04-01), Genuit et al.
patent: 4528457 (1985-07-01), Keefe et al.
"High-Frequency Isolated 4kW Photovoltaic Inverter for Utility Interface"; Proceedings of the 7th International PCI '83 Conference, Sep. 13-15, 1983, Geneva, Switzerland.

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