Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1997-10-27
1999-03-23
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 17, H02M 114
Patent
active
058868844
ABSTRACT:
The present invention is a circuit for zero voltage-zero current switching in a full-bridge DC-DC converter including a transformer for inducing the current and the voltage onto the secondary side by the switching operation of switches configured as full bridge; a full-bridge rectifier by which current of the secondary side flows in only one direction; a smoothing inductor and a capacitor as an output filter, the present circuit comprised of a capacitor and a discharge diode connected in series between the output of the full-bridge rectifier and a ground; a secondary winding of the smoothing inductor and a charge diode connected in series across the capacitor; and another capacitor connected in series with the charge diode. The present circuit configured in the above arrangement enables a full-bridge DC--DC converter to perform a switching operation at zero voltage and zero current without active elements or dissipative elements such as a saturation reactor, thereby achieving a reduction in cost in the manufacture of a converter. In addition, the present circuit reduces the ripples in the output current flowing through the inductor, and is consequently well suited for a DC--DC converter requiring high-frequency switching.
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Cho et al., IEEE, Jul. 1996, "Zero Voltage and Zero Current Switching Full Bridge PWM Converter Using Secondary Active Clamp".
Cho et al., IEEE, May 1997, "Novel Zero-voltage and Zero-Current-Switching (ZVZCS) Full Bridge PWM Converter Using Transformer Auxiliary Winding".
IEEE, Oct. 1978, "Switching DC-To-DC Converter with Zero Input or Output Current Ripple".
Kim et al., IEEE, Jul. 1996, "An Improved Soft Switching PWM FB DC/DC Converter for Reducing Condution Losses".
Baek Ju-Won
Cho Jung-Goo
Kim Eun-Soo
Rim Geun-Hie
Korea Electrotechnology Research Institute
Sterrett Jeffrey
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