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公开(公告)号:US5418704A
公开(公告)日:1995-05-23
申请号:US66943
申请日:1993-05-24
申请人: Guichao C. Hua , Fred C. Lee
发明人: Guichao C. Hua , Fred C. Lee
CPC分类号: H02M3/158 , Y02B70/1425
摘要: To date, soft-switching techniques applied to the PWM converters, with the exception of a few isolated cases, are subjected to either high switch voltage stresses or high switch current stresses, or both. This invention presents a new class of zero-voltage-transition PWM converters, where both the transistor and the rectifier operate with zero-voltage switching, and are subjected to minimum voltage and current stresses. Breadboarded converters are constructed to verify the novelty of the proposed new family of converters.
摘要翻译: 到目前为止,应用于PWM转换器的软开关技术除了几个隔离的情况外,都受到高开关电压应力或高开关电流应力,或两者兼有。 本发明提出了一类新的零电压转换PWM转换器,其中晶体管和整流器都以零电压开关工作,并且经受最小的电压和电流应力。 构建面板式转换器以验证所提出的新系列转换器的新颖性。
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公开(公告)号:US5486752A
公开(公告)日:1996-01-23
申请号:US262049
申请日:1994-06-17
申请人: Guichao C. Hua , Fred C. Lee
发明人: Guichao C. Hua , Fred C. Lee
CPC分类号: H02M3/158 , Y02B70/1425
摘要: A zero-current transition pulse-width modulated (ZCT-PWM) d.c.-d.c. converter allows minority-carrier semiconductor devices such as, for example, bipolar junction transistors (BJTs), insulated gate bipolar transistors (IGBTs), MOSFET controlled thyristors (MCTs), and gate turn-off thyristors (GTOs), to be used as switches for high-power, high frequency applications. The ZCT-PWM converter comprises a shunt resonant branch inserted into a conventional PWM converter circuit. The resonant branch comprises a resonant inductor (Lr), a resonant capacitor (Cr), an auxiliary switch (S1), and an auxiliary diode (D1). The resonant branch is only active during a relatively short switching time in order to create a zero-current switch condition for the main pulse-modulating switch (S) without substantially increasing voltage or current stresses.
摘要翻译: 零电流转换脉宽调制(ZCT-PWM)直流 - 直流 转换器允许诸如例如双极结型晶体管(BJT),绝缘栅极双极晶体管(IGBT),MOSFET控制晶闸管(MCT)和栅极截止晶闸管(GTO))的少数载流子半导体器件用作开关 适用于大功率,高频应用。 ZCT-PWM转换器包括插入到常规PWM转换器电路中的并联谐振分支。 谐振支路包括谐振电感器(Lr),谐振电容器(Cr),辅助开关(S1)和辅助二极管(D1)。 谐振分支仅在相对短的开关时间期间是有效的,以便为主脉冲调制开关(S)创建零电流开关条件,而基本上不增加电压或电流应力。
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公开(公告)号:US5442540A
公开(公告)日:1995-08-15
申请号:US903859
申请日:1992-06-25
申请人: Guichao C. Hua , Fred C. Lee
发明人: Guichao C. Hua , Fred C. Lee
IPC分类号: H02M3/158 , H02M7/5387
CPC分类号: H02M3/158 , Y02B70/1425
摘要: A full-bridge zero-voltage-switching pulse-width-modulated converter employs a saturable reactor in place of the linear inductor in order to reduce current stress on the active switches, reduce voltage stress on the rectifier diodes, and reduce secondary parasitic ringing. The zero-current-switching full-bridge pulse-width-modulated converter embodiment of the invention contemplates the provision of active switches that are zero-current-switched and passive switches, such as diode switches, that are zero-voltage-switched.
摘要翻译: 全桥零电压开关脉宽调制转换器采用可饱和电抗器代替线性电感器,以减少有源开关上的电流应力,减少整流二极管的电压,并减少次级寄生振铃。 本发明的零电流切换全桥脉宽调制转换器实施例设想提供零电流开关和无电压开关(例如二极管开关)的有源开关,其为零电压切换。
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公开(公告)号:US5262930A
公开(公告)日:1993-11-16
申请号:US897674
申请日:1992-06-12
申请人: Guichao C. Hua , Fred C. Lee
发明人: Guichao C. Hua , Fred C. Lee
CPC分类号: H02M3/158 , Y02B70/1425
摘要: A pulse-width-modulated, quasi-resonant, d.c. to d.c. converter that has an auxiliary switch that periodically kills the resonance.
摘要翻译: 脉冲宽度调制,准谐振,直流。 到达 转换器具有周期性地消除共振的辅助开关。
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