Soft switching and interleaving for sinusoidal input current AC to DC step down converters

2002 ◽  
Author(s):  
D.J. Tooth ◽  
S.J. Finney ◽  
J.N. McNeill ◽  
B.W. Williams
Keyword(s):  
Soft Switching ◽  
Input Current ◽  
Sinusoidal Input ◽  
Step Down

A Single-Phase Soft-Switching Unipolar PWM Rectifier

2013 ◽  
Vol 284-287 ◽  
pp. 2439-2444
Author(s):  
Maoh Chin Jiang ◽  
Huang Kai Fu ◽  
Kao Yi Lu
Keyword(s):  
Power Flow ◽  
Single Phase ◽  
Low Frequency ◽  
Soft Switching ◽  
Input Current ◽  
Pwm Rectifier ◽  
Zero Voltage Switching ◽  
Zero Current Switching ◽  
Sinusoidal Input ◽  
Bidirectional Power Flow

This paper proposed a novel single-phase soft-switching unipolar PWM rectifier (SSUPR) using a simple auxiliary resonant unit. All main switches of high-frequency arm operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-off. All main switches of low-frequency arm operate at 60 Hz to greatly reduce switching losses. Moreover, a soft-switching unipolar PWM strategy is used for the proposed soft-switching rectifier. This strategy results in a better input current waveform than for the bipolar PWM strategy. Furthermore, the proposed rectifier achieves a near unity power factor, a sinusoidal input current and a bidirectional power flow capability. Some experimental results of the proposed SSUPR, rated 500 W and operated at 40 kHz, are presented for verification.

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