A new zero voltage and zero current power-switching technique

1992 ◽  
Vol 7 (4) ◽  
pp. 655-665 ◽  
Author(s):  
A.H. Weinberg ◽  
L. Ghislanzoni
Keyword(s):  
Power Switching ◽  
Zero Current ◽  
Zero Voltage

A high-efficiency regulation technique for a zero-voltage zero-current power switching converter

1998 ◽  
Vol 13 (4) ◽  
pp. 739-747 ◽  
Author(s):  
J.A. Carrasco ◽  
A.H. Weinberg ◽  
E. Maset ◽  
E.J. Dede
Keyword(s):  
High Efficiency ◽  
Power Switching ◽  
Switching Converter ◽  
Zero Current ◽  
Zero Voltage

scholarly journals Optimal Design of LLC Resonant DC Transformer under Adaptive Frequency Tracking Strategy

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2160
Author(s):  
Yu Tang ◽  
Dekai Kong ◽  
Chenxu Duan ◽  
Hao Sun
Keyword(s):  
Working Condition ◽  
Transmission Efficiency ◽  
Switching Frequency ◽  
Optimal Operating ◽  
Frequency Tracking ◽  
Zero Current ◽  
Llc Resonant Converter ◽  
Dc Transformer ◽  
Zero Voltage ◽  
Tracking Strategy

In recent years, the LLC (inductor–inductor–capacitor) DC transformer has been widely used in communication and computer power supply because of its advantages of zero voltage conduction of primary switch and zero current turn off concerning the output rectifier diode. To obtain higher transmission efficiency and make the LLC DC transformer always run at the optimal operating point, the switching frequency of the LLC DC transformer should work at the resonance frequency of the circuit. In actual conditions, the optimal operating frequency of the LLC DC transformer will be changed due to the influences of the working condition on the circuit parameters and the load change. Therefore, the LLC DC transformer controlled by the fixed frequency mode will not be in the best working condition. In this paper, an adaptive frequency tracking method is used to control the circuit; when the circuit parameters change, the LLC DC transformer can always be in the best working state. Then, the influence of circuit parameters such as output power and excitation inductor on the optimal working point of the LLC DC transformer is analyzed in detail. Finally, a 1 kW LLC resonant converter prototype is designed under laboratory conditions to verify the feasibility of the control strategy.

scholarly journals A new ZCZVT commutation cell for PWM DC-AC converters

2004 ◽  
Vol 15 (2) ◽  
pp. 162-171 ◽  
Author(s):  
C. M. de O. Stein ◽  
H. L. Hey ◽  
J. R. Pinheiro ◽  
H. Pinheiro ◽  
H. A. Gründling
Keyword(s):  
Design Procedure ◽  
Experimental Results ◽  
Cell Design ◽  
Load Range ◽  
Switching Operation ◽  
Full Load ◽  
Turn On ◽  
Zero Current ◽  
Ac Converters ◽  
Zero Voltage

This paper proposes a new auxiliary commutation cell for PWM inverters that allows the main switches to be turned on and off at zero voltage and zero current. The main switches zero current turn-on reduces the undesired effects of parasitic inductances related to the circuit layout. The main diodes reverse recovery losses are minimized since di/dt and dv/dt are controlled. The ZCZVT commutation cell is located out of the main power path of the converters and is activated only during switching transitions. Additionally, the auxiliary switches are turned on and off at ZCS and use the same ground signals of the upper main switches. The commutation losses are practically reduced to zero. Soft switching operation is guaranteed for full load range without changes in command strategy. The operation of the ZCZVT PWM full-bridge DC-AC Converter is analyzed and an auxiliary commutation cell design procedure based on the analysis is proposed. Experimental results are presented to demonstrate the feasibility of the proposed commutation cell.

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