Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1998-01-12
1999-12-07
Riley, Shawn
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 17, 363 47, H02M 75387, H02M 3335
Patent
active
059994339
ABSTRACT:
A method and apparatus for maintaining relatively low ripple current in a dc-dc converter while minimizing the size of an inductive line filter utilizes a transformer having at least a pair of secondary windings in which the secondary windings are selected to have different numbers of winding turns depending on the specific design of the ideal duty factor at which the converter will be operated. In addition, the converter is provided with an active pre-load which establishes a continuous conduction current when load current is below some selected minimum value in order to provide control stability during light load conditions without converter oscillations. In an illustrated embodiment, the active pre-load circuit comprises a resistor connected in series with a transistor across the voltage output of the converter with the gate terminal of the transistor connected through a zener diode to the control circuit so that when the control voltage feedback signal drops to a selected low value, the transistor is biased into conduction to connect the resistor as a load to maintain a minimum load current. Alternatively, the transistor can be connected across one of the diodes in the transformer secondary and arranged so as to conduct current in a direction opposite to the direction of current through the diode so that under low current conditions, a current loop is formed through the transformer to maintain continuous current flow and allow the converter to operate at very light loads.
REFERENCES:
patent: 4387418 (1983-06-01), Koike
patent: 4860184 (1989-08-01), Tabisz et al.
patent: 5245520 (1993-09-01), Imbertson
patent: 5325283 (1994-06-01), Farrington et al.
Static And Dynamic Analysis of Zero-Voltage-Switched Half-Bridge Converter with PWM Control Tamotsu Ninomiya, Norio Matsumoto, Masatoshi Nakahara, Koosuke Harada 4/91/0700-0230 1991 IEEE, pp. 230-237.
Hua Guichao
Sable Daniel M.
Zhuang Xinfu
Beusse James H.
Han Y. J.
Riley Shawn
VPT, Inc.
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