CAJ | 학술논문

提出一种采用3个开关管的软开关推挽电路。增加的开关管 Q3串接在输入电源和变压器原边绕组中间抽头之间。一个LC网络并联在Q3两端。因为输出滤波电感能量大，2个原始的开关管能够在宽负载范围内实现零电压开通。并联的LC网络增加了Q3开通前变压器漏感中的能量，使得Q3也能在宽负载范围下实现零电压开通。分析电路各工作阶段原理，讨论软开关实现条件，阐述LC器件的设计。完成一台800 W、开关频率为132 kHz的原理样机，样机在86 W下就能实现所有开关管的零电压开通，样机最高效率达到94.14%。测试比较了所提电路和基本的三管推挽电路的效率，结果表明，所提电路在轻载下比基本电路效率高2.31%。
제출일충채용3개개관관적연개관추만전로。증가적개관관 Q3천접재수입전원화변압기원변요조중간추두지간。일개LC망락병련재Q3량단。인위수출려파전감능량대，2개원시적개관관능구재관부재범위내실현령전압개통。병련적LC망락증가료Q3개통전변압기루감중적능량，사득Q3야능재관부재범위하실현령전압개통。분석전로각공작계단원리，토론연개관실현조건，천술LC기건적설계。완성일태800 W、개관빈솔위132 kHz적원리양궤，양궤재86 W하취능실현소유개관관적령전압개통，양궤최고효솔체도94.14%。측시비교료소제전로화기본적삼관추만전로적효솔，결과표명，소제전로재경재하비기본전로효솔고2.31%。
One three-transistor push-pull converter (TTPP converter) was proposed. The additional transistor Q3 is inserted between the input power source and midpoint of primary windings of the transformer. One LC element parallels with the transistor Q3. Two primitive transistors can realize zero-voltage turn-on because of the big energy of output inductor Lf. The LC net increases the energy of the leakage inductance before Q3 turn-on. As a result, Q3 can also achieve zero-voltage turn-on over a wide load range. The operation theory was discussed. The ZVS conditions of the three transistors were explained. The design of the LC net is investigated. A 800 W, 132 kHz prototype was built. Tests showed all power transistors can achieve ZVS at 86 W load. The peak efficiency of the prototype reaches 94.14%. Comparing the proposed TTPP converter with the basic TTPP converter, the efficiency of proposed converter is 2.31%higher than that of the basic converter.