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Inverter-control-circuit

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Inverter control circuit

Details

Inventors: Honjo, Kenji; Nakamura, Tooru;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Ip; Shik Luen Paul
Attorney, Agent or Firm: Bernard, Rothwell & Brown

An inverter control circuit for a power supply source comprising an inverter and a commercial power source (reserve power source) and adapted to connect the inverter normally to a load and to change the inverter with the commercial power source uninterruptedly by means of a thyristor switch to supply power uninterruptedly to the load in case the inverter malfunctions. The inverter control circuit comprises a digital PLL circuit for synchronism control, a bias signal, and a parallel connection of a synchronism control circuit and a synchronism detecting circuit, and is capable of uniterruptedly changing the inverter to the commercial power source by being switched to biasing signals by means of the switch at the timing of the synchronism detecting of the synchronism detecting circuit in case the synchronism control circuit malfunctions.

DETAILED DESCRIPTION It is the primary object of the present invention to provide a useful inverter control circuit eliminated of the disadvantages of the conventional inverter control circuit.
It is another object of the present invention to provide an inverter control circuit capable of transferring power source uninterruptedly from an inverter to a commercial power source when a trouble occurs in the synchronism control circuit of the inverter control circuit.
It is a further object of the present invention to provide an inverter control circuit capable of enabling the maintenance, inspection and repair of the control circuit of a no-break power unit or the like, in which service interruption should not occur.
These and other objects, features and advantages of the present invention will become more apparent from the following detailed description of a preferred embodiment thereof taken in connection with the accompanying drawings.

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