초록 ▼

A control circuit for an inductive load, such as a phase winding of a reluctance motor, includes a boost flyback converter. The controller includes a dc link capacitor switchable across the load by means of a control switch and a suppressor switch for controlling the application of rectified current

A control circuit for an inductive load, such as a phase winding of a reluctance motor, includes a boost flyback converter. The controller includes a dc link capacitor switchable across the load by means of a control switch and a suppressor switch for controlling the application of rectified current to the dc link capacitor. The suppressor switch is operated independently of the control switch in order to control the rectified current so that it follows the sinusoidal input voltage waveform. By this technique, the harmonics generated by switching the rectified input current are substantially suppressed.

대표청구항 ▼

A unidirectional current (dc) control system for a switched reluctance machine having a stator defining stator poles, a rotor defining rotor poles and at least one phase winding, the system comprising: a rectifier, having an alternating current (ac) input and a dc output; a dc link capacitor; contro

A unidirectional current (dc) control system for a switched reluctance machine having a stator defining stator poles, a rotor defining rotor poles and at least one phase winding, the system comprising: a rectifier, having an alternating current (ac) input and a dc output; a dc link capacitor; control switch means arranged to control the current supply to the phase winding from the capacitor; a voltage booster including an inductor arranged in the path of the current from the ac input; suppressor switch means arranged to control the supply of current to the dc link capacitor from the rectifier; sensing means for sensing deviation of the ac input current from a desired waveform and being operable to produce an output indicative of the deviation; and actuating means responsive to the deviation for actuating the voltage booster to compensate for the deviation to maintain the ac input current substantially following the desired waveform to suppress harmonics of the ac input current, and to charge the capacitor to a voltage in excess of a peak value at the ac input to the rectifier.