| 摘要 |
PURPOSE:To suppress the generation of noise and improve reliability, by detecting the DC input voltage of each PWM inverter unit, and by controlling the difference between the current conducting rates of the switching elements of each PWM inverter according to the voltage difference. CONSTITUTION:When the power load of PWM inverter units 2a, 2b gets unbalanced, then it is detected by a substractor 12. The deviation value is amplified by a deviation signal amplifier 13, and is added to an adder 14a and a substractor 14b. In this manner, the difference between the current conducting rates of the switching elements of the PWM inverter units 2a, 2b is controlled. |
