[특허]Static power conversion and apparatus having essentially zero switching losses

Static power conversion and apparatus having essentially zero switching losses 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02M-005/458 H02M-007/162 H02M-007/5387
출원번호	US-0912080 (1986-09-25)
발명자 / 주소	Divan Deepakraj M. (Madison WI)
출원인 / 주소	Wisconsin Alumni Research Foundation (Madison WI 02)
인용정보	피인용 횟수 : 69 인용 특허 : 0

초록 ▼

A high efficiency power converter is achieved utilizing a resonant DC link between a DC source, such as a converter rectifying power from an AC power system, to a variable frequency voltage source inverter. A resonant circuit composed of an inductor and capacitor is connected to the DC power supply and to a DC bus supplying the inverter and is caused to oscillate stably at a high frequency to provide a uni-directional voltage across the DC bus which reaches zero volts during each cycle of oscillation of the resonant circuit. The switching devices of the inverter are controlled to switch on and off only at times when the DC bus voltage is zero, thereby eliminating switching losses in the inverter. The resonant circuit can be caused to oscillate utilizing pairs of switching devices in the inverter or a separate switching device across the capacitor, which again are caused to switch on and off only at times of zero voltage on the DC bus. For AC to AC conversion, enabling bi-directional power flow, the switching devices of the power source which converts AC power to DC power may have switching devices which are also switched only at the times of zero voltage so that switching losses in these devices is also minimized.

대표청구항 ▼

A power converter for converting DC power to AC power comprising: (a) a resonant circuit having an inductor adapted to receive a DC power input, a capacitor connected to the inductor, and a DC bus providing the output voltage from the resonant circuit; (b) means for causing the resonant circuit to oscillate stably at or below its resonant frequency and for the voltage across the DC bus to be maintained at an average DC level and to go to zero voltage at least once during each cycle of oscillation of the resonant circuit; and (c) an inverter connected to receive the voltage on the DC bus and having gated switching devices which are switched on and off only when the voltage on the DC bus is substantially zero. The power converter of claim 8 wherein the means for causing the resonant circuit to oscillate includes series connected pairs of switching devices connected across the DC bus which are switched at times of zero voltage on the DC bus to develop sufficient current in the inductor to maintain stable oscillations in the resonant circuit with the voltage across the capacitor of the resonant circuit going to zero during each cycle of oscillation.

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Static power conversion and apparatus having essentially zero switching losses 원문보기

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