| 摘要 |
PROBLEM TO BE SOLVED: To provide a boosting chopper device which has a high switching frequency and little loss in a snubber discharging resistor while a switching element is turned on. SOLUTION: This boosting chopper device includes a snubber circuit which is connected with a DC power supply 1, stores energy in a DC reactor 3 by turning on the switching element 4, supplies a voltage higher than the voltage of the power supply 1 to a load 2 by charging the stored energy into an output side capacitor 7 through a diode 6 during an off-period of the switching element 4, and prevents the switching element 4 from being destructed due to an excess voltage by absorbing a surge voltage by a snubber capacitor 9 generated at turning off the switching element 4. The boosting chopper device is also provided with a snubber discharging reactor 12 connected in series with the snubber discharging resistor 11 for discharging the voltage of the snubber capacitor 9 charged up to the surge voltage during the off-period of the switching element 4 to the output side capacitor voltage. COPYRIGHT: (C)2004,JPO&NCIPI
|
