AC chopping circuit and associated single-phase AC motor driving system
AssigneeXiamen Kiwi Instruments Corporation
InventorsZongjie Zhou, Huijie Yu, Kunming Cai
Life of this patent
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Abstract
According to some embodiments, AC chopping circuit includes a switching circuit, a synchronizing signal generating circuit, a switch driving circuit and an auxiliary power supplying circuit. In some examples, the switching circuit are coupled to an AC power source and a load. In certain examples, the synchronizing signal generating circuit provides a synchronizing signal which is related to a polarity of the AC power source. In some examples, the switching circuit is controlled based at least in part on the synchronizing signal.
Claims20
An alternating current (AC) chopping circuit, comprising:
- a switching circuit comprising a first input terminal, a second input terminal, a first output terminal and a second output terminal, wherein the first input terminal is coupled to a first terminal of an AC power source, the second input terminal is coupled to a second terminal of the AC power source, the first output terminal is coupled to a first terminal of a load, and the second output terminal is coupled to a second terminal of the load;
- a synchronizing signal generating circuit configured to generate a synchronizing signal associated with a polarity of the AC power source;
- a switch driving circuit configured to control the switching circuit based at least in part upon the synchronizing signal;
- and
- an auxiliary power supplying circuit coupled to the switching circuit, the auxiliary power supplying circuit generating an auxiliary power signal coupled to the switch driving circuit based at least in part on a voltage signal generated by the switching circuit.
A driving method for driving an AC motor, comprising:
- coupling an AC power source to a switching circuit without a rectifying bridge coupled between the AC power source and the switching circuit;
- driving the switching circuit based on a polarity of the AC power source;
- generating an auxiliary power signal based at least in part on a signal generated by the switch signal;
- providing the auxiliary power signal to a control circuit coupled to the switching circuit;
- and
- generating, by the switching circuit, an output to the AC motor.
Dependencies are inferred from the claim text.