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Title:
POWER CIRCUIT
Document Type and Number:
Japanese Patent JP2010252580
Kind Code:
A
Abstract:

To prevent contacts of main relays from deteriorating or welding on the occurrence of faults in refrigerating cycles.

A power circuit 1 of an air conditioner includes a rectification circuit RC, a capacitor C (smoothing circuit), the main relay 10 provided on a current path between the rectification circuit RC and the capacitor C, an inverter circuit 30, a microcomputer 100, and a delay circuit 40. The microcomputer 100 includes an inverter circuit control unit 110, a main relay open/close control unit 120, and a fault signal receiving unit 130. When a fault detection unit 200 detects a fault in the air conditioner to output an fault signal to the fault signal receiving unit 130, the inverter circuit control unit 110 outputs a drive signal for stopping the inverter circuit 30. After a first predetermined delay time from the output, the main relay open/close control unit 120 outputs a control signal for opening the main relay 10.


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Inventors:
SARUWATARI HIROTAKA
SHIMATANI KEISUKE
YAGI TATSU
NAKASHITA YUKO
Application Number:
JP2009101325A
Publication Date:
November 04, 2010
Filing Date:
April 17, 2009
Export Citation:
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Assignee:
DAIKIN IND LTD
International Classes:
H02P27/06
Domestic Patent References:
JP2007282318A2007-10-25
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Tanaka rice



 
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