Abstract: A three-phase converter and a control method thereof are provided. The three-phase converter includes an AC terminal, three filter circuits, three bridge arm circuits, a capacitor module and a DC terminal connected in sequence and a controller. The midpoints of the filter circuits are connected to the midpoint of the capacitor module. The controller controls each bridge arm circuit to work in the first and second modes at different time in one line voltage cycle of the AC source. In the first mode, the bridge arm circuit works in a clamping state. In the second mode, the bridge arm circuit selectively works in a DCM mode or a TCM mode. A switching frequency is limited to be lower than a preset frequency. When the three-phase converter works with over 80% of a rated load, a time length of working in the second mode is ?˜? of the line voltage cycle.

Abstract: A three-phase converter and a control method thereof are provided. The three-phase converter includes an AC terminal, three filter circuits, three bridge arm circuits, a capacitor module and a DC terminal connected in sequence and a controller. The midpoints of the filter circuits are connected to the midpoint of the capacitor module. The controller controls each bridge arm circuit to work in the first and second modes at different time in one line voltage cycle of the AC source. In the first mode, the bridge arm circuit works in a clamping state. In the second mode, the bridge arm circuit selectively works in a DCM mode or a TCM mode. A switching frequency is limited to be lower than a preset frequency. When the three-phase converter works with over 80% of a rated load, a time length of working in the second mode is ?˜? of the line voltage cycle.

Abstract: A control method for a power supply apparatus is provided. Firstly, at least one of an output voltage or an output current of the resonant converter is sampled. Then, an error signal is generated according to a reference value and at least one of the output voltage or the output current. While the resonant converter is in a burst mode, a first switching signal and a chopping signal are generated according to the error signal. The chopping signal has a chopping period and a duty cycle. The chopping period and the duty cycle are dynamically adjusted according to the error signal. Then, a second switching signal is generated according to the chopping signal and the first switching signal. A switch unit of the resonant converter is turned on or turned off according to the second switching signal.

Abstract: A control method for a power supply apparatus is provided. Firstly, at least one of an output voltage or an output current of the resonant converter is sampled. Then, an error signal is generated according to a reference value and at least one of the output voltage or the output current. While the resonant converter is in a burst mode, a first switching signal and a chopping signal are generated according to the error signal. The chopping signal has a chopping period and a duty cycle. The chopping period and the duty cycle are dynamically adjusted according to the error signal. Then, a second switching signal is generated according to the chopping signal and the first switching signal. A switch unit of the resonant converter is turned on or turned off according to the second switching signal.