| 摘要 |
PURPOSE:To obtain capacitor voltage from which a ripple component is removed by detecting currents flowing through a converter and adding the value to capacitor voltage detecting value containing the ripple through the DC component removing filter and an integrator. CONSTITUTION:The currents flowing through the power converter 4 are detected by means of a current detector 6, and the value is supplied to the high-pass filter 7 and the integrator 8 and the detecting output voltage of a voltage detector 5, voltage Vo having a waveform obtained by inverting a waveform of a pulsation component of the capacitor voltage and amplitude, to an adder 9. On the other hand, the detecting voltage Vv of the voltage detector 5 is applied to the adder 9. Accordingly, DC voltage having a flat waveform acquired by offseting and removing the pulsation component voltage of the capacity voltage, ripple voltage, from the adder 9 is obtained. |
