Refrigeration – Automatic control – Time or program actuator
Patent
1992-05-29
1993-01-19
Tanner, Harry B.
Refrigeration
Automatic control
Time or program actuator
62230, 361 22, 318778, 318811, 417 45, H02P 100, F25B 4900
Patent
active
051798425
ABSTRACT:
This invention provides an inverter controlled air conditioner capable of employing a rush current preventing relay having a small capacitance, thereby decreasing the cost. An inverter circuit includes a rectifying circuit connected to an AC power supply, a smoothing capacitor connected to the output terminals of the rectifying circuit, and a switching circuit, connected to the two terminals of the capacitor, for outputting a voltage having a predetermined frequency upon performing switching. An auxiliary power supply circuit has a rectifying circuit connected to the AC power supply. A control section drives the switching circuit with an output from the rectifying circuit as the operation voltage. Relay drive circuits for receiving the output from the rectifying circuit as the operation voltage are connected to an electromagnetic contactor and a relay. When the air conditioner is started, the control section energizes the relay for a predetermined period of time t.sub.s through the relay drive circuits and thereafter energizes the electromagnetic contactor. Normally-open contacts of the electromagnetic contactor are connected between the AC power supply and the inverter circuit. The capacitor of the inverter circuit is connected to the output terminals of the rectifying circuit of the auxiliary power supply circuit through a resistor and normally-open contacts of the relay.
REFERENCES:
patent: 4516912 (1985-05-01), Leitgeb et al.
patent: 4709292 (1987-11-01), Kuriyama et al.
patent: 4719398 (1988-01-01), Paice
patent: 4735058 (1988-04-01), Umezu et al.
Kabushiki Kaisha Toshiba
Tanner Harry B.
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