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.

Analysis of Full Bridge Series Parallel Resonant Converter for Battery Chargers

2013 ◽  
Vol 768 ◽  
pp. 388-391
Author(s):  
M. Santhosh Rani ◽  
Julie Samantaray ◽  
Subhransu Sekhar Dash
Keyword(s):  
Resonant Frequency ◽  
Resonant Converter ◽  
Battery Charger ◽  
Passive Components ◽  
Turn On ◽  
Secondary Battery ◽  
Battery Chargers ◽  
Zero Current ◽  
Simulation Results ◽  
Zero Voltage

This paper presents a novel application of full-bridge series parallel resonant converter (FBSPRC) for dc source and secondary battery interface. Secondary batteries has been widely used in the application of residential, industrial and commercial energy storage systems because of its low energy conversion loss, which enhances the systems overall efficiency. A series parallel loaded resonant converter (SPRC) which is a subset of DC-DC converter can be operated with either zero-voltage turn-on (above resonant frequency) or zero current turn off (below resonant frequency) to eliminate the turn on and turn-off losses of the semiconductor devices. This converter is widely used to achieve reduction in size of the passive components of the converter such as inductor, capacitor and transformers. Simulation results based on a 12V 45Ah battery charger are proposed to validate the analysis and to demonstrate the performance of the proposed approach. Satisfactory performance is obtained from the measured results. The simulation results validate the effectiveness of the chosen battery charger.

An Improved Zero Voltage Transition PWM Boost Converter with an Active Snubber Cell

2016 ◽  
Vol 25 (10) ◽  
pp. 1650128 ◽  
Author(s):  
Sevilay Cetin
Keyword(s):  
Energy Transfer ◽  
Boost Converter ◽  
Maximum Efficiency ◽  
Current Stress ◽  
Zero Voltage Switching ◽  
Turn On ◽  
Zero Current Switching ◽  
Zero Current ◽  
Voltage Stress ◽  
Zero Voltage

This study presents an improved zero voltage switching (ZVS) boost converter with an active snubber cell providing soft switched operation for all semiconductors. The active snubber cell reduces the reverse recovery loss of the boost diode and also provides the zero voltage transition (ZVT) Turn-on and ZVS Turn-off for the boost switch. The zero current switching (ZCS) Turn-on and ZVS Turn-off for the snubber switch is also achieved. All diodes in the converter can be operated with soft switching (SS). In the snubber cell, SS energy can be transfered effectively to the output by the use of a snubber inductor and a capacitor. This energy transfer allows the use of additional parallel connected capacitor to the boost switch to provide ZVS turning off. There is no additional voltage and current stress on the boost switch and boost diode. The voltage stress of the snubber switch is also limited by the output voltage and the current stress of the snubber switch is reduced by the energy transfer to the output. SS operating of the semiconductors is maintained at very wide load ranges. The operation of the proposed converter is presented with a detailed steady state analysis. The predicted theoretical analysis is validated by a prototype with 500[Formula: see text]W output power and 100[Formula: see text]kHz operating frequency. The measured maximum efficiency values are obtained as approximately 97% and 85.4% at full load and 10% load conditions, respectively.

scholarly journals A family of improved ZVT PWM converters using an auxiliary resonant source

2003 ◽  
Vol 14 (4) ◽  
pp. 412-421 ◽  
Author(s):  
M. L. Martins ◽  
H. Pinheiro ◽  
J. R. Pinheiro ◽  
H. A. Gründling ◽  
H. L. Hey
Keyword(s):  
Resonant Circuit ◽  
Zero Voltage Switching ◽  
Full Load ◽  
Pwm Converters ◽  
Current Switching ◽  
Zero Current Switching ◽  
Zero Current ◽  
Zero Voltage ◽  
Additional Current ◽  
Voltage Switching

This paper presents a novel family of Zero Voltage Transition (ZVT) DC-DC PWM Converters that uses a resonant circuit as auxiliary commutation source to control the current through the auxiliary switch without additional current stresses on main devices. The improved ZVT commutation cell enables the main switch to be turned on and off at Zero Voltage Switching (ZVS) and the auxiliary switch to be turned on and off at Zero Current Switching (ZCS) from zero to full-load.

An AC/DC PFC Converter with Active Soft Switching Technique

2014 ◽  
Vol 3 (3) ◽  
pp. 101-121 ◽  
Author(s):  
S. Aiswariya ◽  
R. Dhanasekaran
Keyword(s):  
Power Factor ◽  
Input Voltage ◽  
Boost Converter ◽  
Soft Switching ◽  
Load Range ◽  
Turn On ◽  
Zero Current Switching ◽  
Zero Current ◽  
Output Side ◽  
Current Transition

This paper proposes an AC-DC converter with the application of active type soft switching techniques. Boost converter with active snubber is used to achieve power factor correction. Boost converter main switch uses Zero Voltage Transition switching for turn on and Zero Current Transition switching for turn off. The active snubber auxillary switch uses Zero Current Switching for both turn on and turn off. Since all the switches of the proposed circuit are soft switched, overall component stress has been greatly reduced and the output DC voltage is expected to have low ripples. A small amount of auxillary switch current is made to flow to the output side by the help of coupling inductor. The proposed circuit is simulated using MATLAB Simulink. All the related waveforms are shown for the reference. The power factor is measured as 0.99 showing that the input current and input voltage is in phase with each other. The PFC circuit has very less number of components with smaller size and can be controlled easily at a wide line and load range.

Novel true zero current turn-on and turn-off converter family: analysis and experimental results

2010 ◽  
Vol 3 (1) ◽  
pp. 33 ◽  
Author(s):  
E.C. Dias ◽  
L.C.G. Freitas ◽  
E.A.A. Coelho ◽  
J.B. Vieira ◽  
L.C. de Freitas
Keyword(s):  
Experimental Results ◽  
Turn On ◽  
Zero Current ◽  
Family Analysis
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