| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power conversion circuit capable of surely detecting a state of a current by a voltage Vo using one threshold voltage ΔV. <P>SOLUTION: A desired current is made to flow in a coil 14 by controlling the switching of switching elements 18, 20 by a PWM controller 60. A voltage sensor 42 detects a value of Vo-ΔV, which is a difference from the pre-determined threshold voltage ΔV, and a value of Vo-(Vc-ΔV), which is a difference from a value obtained by subtracting threshold value ΔV from a voltage Vc of an upper side line, with regard to the middle point voltage Vo of the switching elements 18, 20. The detection results obtained from the voltage sensor are inputted into the PWM controller 60 through flip-flop circuits 44, 46 and a dead time compensator 48, and dead time compensation is performed with regard to an instruction in the generation of a PWM control signal, for instance. <P>COPYRIGHT: (C)2008,JPO&INPIT |
