| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power source voltage detection device of an inverter capable of detecting a power source voltage precisely in a device in which a secondary winding voltage of a transformer for detecting the power source voltage changes, when a switching frequency of the inverter is made variable. <P>SOLUTION: A value of an output voltage Vd of a DC power source presumed from a voltage generated in the secondary winding N13 of the transformer 4 is adjusted based on a switching frequency of a drive signal that drives the switching elements of the inverter 2. More specifically, a duty correcting value Dadj of the drive signal for connecting and disconnecting a current flowing in the primary winding N11 is calculated based on a difference between the switching frequency fsw of the inverter and a reference switching frequency fsw1. Then, an output voltage estimate value after the correction is calculated based on a drive signal duty reference value Dref, which is a drive signal duty value in a case where the switching frequency of the inverter is the reference switching frequency fsw1, and the duty correcting value Dadj. <P>COPYRIGHT: (C)2007,JPO&INPIT |
