| 摘要 |
PURPOSE:To accurately detect the phase voltage and phase of the AC side output of an inverter without using a transformer by providing signal detecting means for integrating and producing the ON and OFF control signal of a switching element. CONSTITUTION:When the output of a hysteresis comparator 6 becomes positive signal, a base drive circuit 7 drives a switching element 20 of an inverter, flows a current in the direction for flowing the current in a motor 3. When the output of the comparator 5, on the other hand, becomes negative signal, it drives a switching element 21 and flows a current in the direction for producing it from the motor 3. This current is detected by an integrator 50 forming a current detector. The output of the integrator 50 represents the voltage and phase of the AC side output of the inverter. |
