POWER SUPPLY APPARATUS AND AIR CONDITIONER

PROBLEM TO BE SOLVED: To propose a power supply apparatus which can detect welding of a relay while preventing or suppressing increase in circuit size and cost. SOLUTION: When power supply is started from an external power source to a control unit by turning on a breaker (#1), a time counting sectio...

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Bibliographische Detailangaben
1. Verfasser:	SARUWATARI HIROTAKA
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To propose a power supply apparatus which can detect welding of a relay while preventing or suppressing increase in circuit size and cost. SOLUTION: When power supply is started from an external power source to a control unit by turning on a breaker (#1), a time counting section counts an elapse of time from the power supply start time (#2), and when the time counting section counts a preset elapse of time (#3), a relay welding detecting section detects the output voltage of the capacitor (#4). The relay welding detecting section compares the magnitude of an output voltage with that of a threshold value, and when the output voltage is larger than the threshold value (YES in #5), it is determined that there is welding at least in either of a main relay and the rush current preventing relay (#6), and a notifying section notifies the determination (#7). On the other hand, when the output voltage is less than or equal to the threshold value (NO in #5), it is determined that there is no welding in the main relay and the rush current preventing relay (#8). COPYRIGHT: (C)2010,JPO&INPIT