Control method of inverter circuit
First Claim
1. A control method for controlling an inverter circuit, the inverter circuit comprising at least one bridge arm, an inductor and a parasitic capacitor, the bridge arm comprising an upper switch element and a lower switch element connected in series, the upper switch element and the lower switch element being alternately turned on and turned off to convert a DC input voltage to an AC output voltage, the control method comprising steps of:
- dividing a half cycle of the AC output voltage into a first stage and a second stage;
controlling the upper switch element and the lower switch element of the bridge arm to be operated at a first switching frequency lower than a preset threshold frequency in the first stage, so that the inverter circuit is operated in a continuous current mode; and
controlling the upper switch element and the lower switch element of the bridge arm to be operated at a second switching frequency in the second stage, so that the upper switch element and the lower switch element are turned on at a preset voltage level and the inverter circuit is operated at a discontinuous current mode boundary mode.
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Abstract
A control method of an inverter circuit includes the following steps. Firstly, a half cycle of the AC output voltage is divided into a first stage and a second stage. Then, the upper switch element and the lower switch element are controlled to be operated at a first switching frequency lower than a preset threshold frequency in the first stage, so that the inverter circuit is operated in a continuous current mode. Then, the upper switch element or the lower switch element of the bridge arm is controlled to be operated at a second switching frequency in the second stage, so that the upper switch element and the lower switch element are turned on at a preset voltage level and the inverter circuit is operated at a discontinuous current mode boundary mode.
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Citations
11 Claims
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1. A control method for controlling an inverter circuit, the inverter circuit comprising at least one bridge arm, an inductor and a parasitic capacitor, the bridge arm comprising an upper switch element and a lower switch element connected in series, the upper switch element and the lower switch element being alternately turned on and turned off to convert a DC input voltage to an AC output voltage, the control method comprising steps of:
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dividing a half cycle of the AC output voltage into a first stage and a second stage; controlling the upper switch element and the lower switch element of the bridge arm to be operated at a first switching frequency lower than a preset threshold frequency in the first stage, so that the inverter circuit is operated in a continuous current mode; and controlling the upper switch element and the lower switch element of the bridge arm to be operated at a second switching frequency in the second stage, so that the upper switch element and the lower switch element are turned on at a preset voltage level and the inverter circuit is operated at a discontinuous current mode boundary mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification