| 摘要 |
<P>PROBLEM TO BE SOLVED: To make the gradient of a switching current of a switch component gentle at the start of the current, to reduce the turn-on loss of the switch component and the loss of the reverse current characteristic of a diode, to make a zero voltage turned-off via the low loss snubber circuit at the turn-off of the switch component, and improve the efficiency of a boost chopper circuit. Ž<P>SOLUTION: In order to make the zero-voltage turned off, the energy of a capacitor C2 is moved to a capacitor C3 by series resonance operation when a switch component Q1 is turned on and excess accumulative magnetic energy is absorbed by the capacitor C2 to discharge the capacitor C3 to a smoothing capacitor C1 and a load RL via a transformer T1 and a diode D5 when the switch component is turned off. In order to make the gradient of the switching current of the switch component gentle at the start thereof, the main coil 1A of a boost reactor L1 is provided with a coil 1B to accumulate magnetic energy while the switch component of a reactor L2 is turned off and to discharge magnetic energy while the switch component Q1 is turned on. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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