| 摘要 |
PROBLEM TO BE SOLVED: To control the dead time correction to prevent in advance the case where hunting is induced by errors, etc., when the dead time correction of an inverter to be mounted on an air conditioner is performed by detecting the current of only one phase. SOLUTION: A dead time correction control device comprises an inverter 1 to convert the DC to the AC of variable frequency, a compressor 2 to be driven by the inverter 1, a motor current detection part 3 to detect the current flowing in a motor build in the compressor 2, a zero-cross phase detection part 4 to detect the mean value of the phase of the zero-cross of the motor current from the output of the motor current detection part 3, and a waveform operating part 6 which operates the PWM waveform taking into consideration the dead time correction from the output of the zero-cross phase detection part 4, the output frequency command value, and the dead time correction set value, and drives the inverter 1. Induction and expansion of the hunting can be effectively prevented in advance by using the mean value of the zero- cross phase to the value of the zero-cross phase of the motor current to correct the dead time. |
