| 摘要 |
PURPOSE:To improve the accuracy in control of charge voltage by preventing the influence of switching noise. CONSTITUTION:A subtraction and division circuit 31 calculates the number of times of switching required for charging a high voltage capacitor to a specified voltage from a voltage command value V8b and residual voltage detection value Vref. An A/D conversion circuit 32 converts the number of times of switching from an analog value to a digital value, and presets it in a counter circuit 33. The counter circuit 33 starts the count of the number of times of switching to the number of times of switching when a command signal S is input. A flip-flop circuit 34 outputs a signal corresponding to the operation command for starting or stopping the switching operation of an inverter switching circuit based on the number of times of switching. When the charge operation ends, the counter circuit 33 outputs a charge end signal EOC to the general control circuit. |
