| 摘要 |
PROBLEM TO BE SOLVED: To provide a power conversion circuit capable of varying an output voltage from a negative voltage lower than a ground voltage to a positive voltage higher than a power supply voltage, and a driving method and a drive unit therefor. SOLUTION: This power conversion circuit 10 includes: a transformer 12 at a turn ratio of 1:1 between the primary winding L1 and the secondary winding L2; a capacitor 14 for voltage output; and four switches SW1 to SW4. The power conversion circuit 10 can be operated as DC-DC converter of step-up type, step-up-and-down type, a step-down type, an inverted output step-up-and-down type, or an inverted output step-up type by selecting two switches used for control from among the four switches SW1 to SW4 and alternately turning on the two switches. Therefore, switching the operating mode of the power conversion circuit 10 as appropriate enables the output voltage to be continuously varied within a range from a negative voltage lower than a ground voltage to a positive voltage higher than a power supply voltage. COPYRIGHT: (C)2009,JPO&INPIT
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