| 摘要 |
PROBLEM TO BE SOLVED: To obtain an output voltage eliminated with a fixed error voltage caused by a dead time circuit to increase the voltage controllability by installing a compensation signal adding means for adding a compensation signal having the polarity corresponding to that of a load current detected by a current detector to compensate a voltage command value. SOLUTION: A low-pass filter 41 outputs an average value I of a load current with respect to time. When the absolute value of the average value I is a specified value I0 or below, a compensation signal generator 42 outputs a compensation signal with its magnitude proportional to the average value I at a specified voltage value V0 or below. When the absolute value of the average value I exceeds the specified value I0, a compensation signal is outputted which has the polarity corresponding to that of a load current and which has a specified absolute value V0. The specified value V0 is a value corresponding to a fixed error voltage and can be found by multiplying a specified proportional constant, the chopper frequency, and the dead time of a dead time circuit 60. The compensation signal is added to a voltage command value outputted from the ACR 34 by an adder 43. |
