| 摘要 |
PROBLEM TO BE SOLVED: To control an inverter circuit and a converter circuit stably based on a control signal outputted from a single PWM output port, by outputting a converter control signal and an inverter control signal selectively from the single output port, and forming a switch circuit and a signal level setting circuit. SOLUTION: If an inverter conduction factor calculated by a control circuit 5 is less than 100%, the control circuit 5 outputs an inverter conduction factor signal from a PWM output port 505 to supply it into a switch circuit 6 through a signal level setting circuit 9. The switch circuit 6 supplies a DC voltage value of a filter capacitor 2C into a converter control circuit 7. If the inverter conduction factor is 100% or more, the control circuit 5 outputs a correction DC voltage value signal from the PWM output port 505, and the switch circuit 6 supplies the correction DC voltage value signal into the converter control circuit 7 through an integrating circuit 10 to output a maximum conduction factor signal for an inverter control circuit 8. |
