Patent ID: 7570029
Filing Date: 2009-08-04
Classification: H02M,Y02B

Abstract:
1. An active power conditioner, comprising: an input filter having an input side and an output side, with the input side connecting with a AC power source in parallel and the output side providing a first output terminal and a second output terminal; an output filter comprising an inductor and a capacitor, and both of the inductor and the capacitor having a first terminal and second terminal, said capacitor connected in parallel with a load through the first terminal and the second terminal thereof, said inductor engaging with the first terminal of the capacitor through the first terminal of the inductor and with the first output terminal of the input filter through the second terminal of the inductor; a first power electronic switch set comprising two serial-connected power electronic switches, with a first connected point being formed between the two power electronic switches and connecting to the first output terminal of the input filter, with the first power electronic switch set further comprising a top terminal and a down terminal at two ends thereof; a second power electronic switch set comprising two serial-connected power electronic switches, with a second connected point being formed between the two power electronic switches of the second power electronic switch set and connecting to the second output terminal of the input filter, with the second power electronic switch set further comprising a top terminal and a down terminal at two ends thereof; a third power electronic switch set comprising two serial-connected power electronic switches, with a third connected point being formed between the two power electronic switches of the third power electronic switch set and connecting to the second terminal of the capacitor, with the third power electronic switch set further comprising a top terminal and a down terminal at two ends thereof; and a controller generating a set of driving signals to control the power electronic switches within the first, second and third power electronic switch sets; wherein the three power electronic switch sets connect with each other in parallel through the top and down terminals, and one of the second and third power electronic switch sets is controlled via high-frequency switching and the other power electronic switch sets that are not switched in high frequency controlled to switch in low-frequency switching.