| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a power supply device from being damaged even when a relay contact of the power supply device operates abnormally. <P>SOLUTION: A relay contact 26 is connected between positive power supply input terminals 16p and 22p of inverters 10 and 12. A relay contact 28 is connected between negative power supply input terminals 16n and 22n. A positive direct current power supply terminal 8p is connected to the positive power supply input terminal 16p of the inverter 10. A negative direct current power supply terminal 8n is connected to the negative power supply input terminal 22n of the inverter 12. When a voltage between the positive direct current power supply terminal 8p and the negative direct current power supply terminal 8n is larger than a predetermined value, a drive part 32 opens the relay contacts 26 and 28. When the direct current voltage is a predetermined value or lower, the drive part 32 closes relay contacts 26 and 28. An anode of a diode 30 is connected to the negative power supply input terminal 16n of the inverter 10, and a cathode of the diode 30 is connected to the positive power supply input terminal 22p of the inverter 12. <P>COPYRIGHT: (C)2012,JPO&INPIT |
