Patent ID: 7741811
Filing Date: 2010-06-22
Classification: H02J

Abstract:
1. The capacitor charging control circuit, a plurality of bypass devices which are connected to a plurality of series-connected capacitors to bypass currents respectively; a plurality of bypass device control units which control currents passed through the bypass devices respectively; and a control voltage setting unit which can switch control voltages while inputting an identical control voltage to each of the plurality of bypass device control units, wherein the bypass device control unit charges each of the capacitors, the bypass device control unit keeps the bypass device in a cut-off state when a charging voltage of the capacitor is lower than a predetermined voltage value determined by the control voltage, and the bypass device control unit causes the capacitor to discharge through the bypass device to keep the charging voltage of the capacitor constant when the charging voltage of the capacitor exceeds the predetermined voltage value, and wherein the control voltage setting unit includes: a voltage divider circuit which includes a plurality of series-connected resistors having an identical resistance value; and a switching unit which switches the control voltages by changing voltage take-out positions from the voltage divider circuit, and the predetermined voltage values are changed at equal intervals by changing the control voltage with the voltage setting unit.