| 摘要 |
PROBLEM TO BE SOLVED: To restrain fluctuation in anti-ground potential due to switching for restraint of noise by forming a cluster of switches between the positive and negative poles of a DC power source and the first and second output lines, connecting the identical type of reactors between the respective output lines and loads, and driving the cluster of switches simultaneously. SOLUTION: Outputted current control is conducted by a sine wave current command signal from a current command generator 11 and a main current feedback signal from a current detector 12. The current controller 13 has a proportional integral function, for example, to output an output command signal. A comparator 14 compares the output command signal with the outputted signal (carrier signal) of a triangular wave generator 15 to generate a PWM signal. Switches 4 to 7 which form an inverter bridge 2 are switched at the frequency of a carrier signal, so that increase/decrease of outputted current is repeated at the frequency. It is thus possible to eliminate fluctuation in anti-ground potential at respective DC parts caused by fluctuation in a switching pattern for difficult generation of EMI mouse. |
