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ZERO-CURRENT SWITCHING-MODE FORWARD QUASI-RESONANT DC-DC POWER CONVERTERS WITH HIGH-FREQUENCY TRANSFORMER LINK USING IGBTS
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| Author(s) |
L. Ding; M. Nakaoka; Y. Ogino |
| Abstract |
This paper presents two forward types of isolated quasi-resonant DC-DC power converters incorporating the resonant switch tank topologies operating under the principle of zero-current switching (ZCS) control scheme. These high power converters featured practically by using new bipolar-mode power semiconductor devices (lGBTs or SI thyristors) for high-frequency switching control are introduced in order to minimize switching losses and stresses, and to reduce EMI noise level, and to utilize the parasitic circuit parameters contained into the high-frequency transformer and power semiconductor devices. The one-switch / two-switch ZCS-forward quasi-resonant converters with high-frequency transformer link including DC regenerating feedback diode loops are newly derived from the conventional PWM forward converters using one-switch / two-switch on the basis of employing current-mode resonant switch concepts with unidirectional or bidirectional topology. The converter circuits demonstrated here are capable of operating in the ultrasonic frequency ranges up to about 1MHz with a significant improvement in performances and high-power density. ln particular, the worklng principle of the two-switch forward ZCS quasi-resonant converter with unidirectional half-cycle current switch is described In detail. Developed is the steady-state operating analysis for ZCS-forward quasi-resonant converter circuit both one-switch and two-switch topologies. The voltage regulation characteristics in steady-state under the operation restrictions and frequency-modulation strategy are illustrated and evaluated using the normalized expressions. The trially-produced forward ZCS quasi-resonant DC-DC converter breadboard using two-IGBTs with unidirectional switch topology suitable for high-power applicatlons are practically built and tested experimentally as battery charger for electrical vehicle system. |
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| Filename: | Unnamed file |
| Filesize: | 879.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-08 by System |
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