[특허]Method for controlling a power converter using an auxiliary resonant commutation circuit

Method for controlling a power converter using an auxiliary resonant commutation circuit 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02M-007/521
출원번호	US-0583910 (1990-09-17)
발명자 / 주소	De Doncker Rik W. A. A. (Niskayuna NY) Lyons James P. F. (Niskayuna NY)
출원인 / 주소	General Electric Company (Schenectady NY 02)
인용정보	피인용 횟수 : 48 인용 특허 : 0

초록 ▼

A method for controlling a power converter and an associated auxiliary commutation circuit ensures soft-switching of all switching devices employed therein. Such a power converter includes an inverter with at least two main switching devices per phase. Across each main switching device are connected an antiparallel diode and a relatively large snubber capacitor. The auxiliary resonant commutation circuit comprises two antiparallel-coupled auxiliary switching devices coupled in series with a resonant circuit including an inductor and the snubber capacitors. The gating and conduction times of the main and auxiliary switching devices are controlled so as to add boosting energy to the resonant operation, thus ensuring that the inverter output voltage at least reaches the positive and negative inverter rail voltages during each resonant commutation cycle. As a result, the control achieves commutation of the converter pole with substantially no switching losses.

대표청구항 ▼

A method for controlling a power converter of the type including an inverter having at least one phase, said inverter having at least two series-coupled main switching devices per phase, said series-coupled main switching devices being coupled to positive and negative rails of a dc supply, the junction between said main switching devices being coupled to a load, said main switching devices each having a snubber capacitor coupled in parallel therewith and an antiparallel diode coupled thereacross, said power converter further including a pair of series-coupled bus-splitting capacitors coupled between said positive and negative rails of said dc supply, said power converter further including an auxiliary resonant commutation circuit coupled between the junction joining said main switching devices and the junction joining said bus-splitting capacitors, said auxiliary resonant commutation circuit comprising a pair of antiparallel-coupled auxiliary switching devices coupled in series with a resonant circuit, said resonant circuit including an inductor and said snubber capacitors, said method comprising commutating load current between one of said main switching devices and the opposing one of said antiparallel diodes coupled across the other one of said main switching devices, when commutation is initiated with load current in said opposing one of said antiparallel diodes, by: (a) applying a forcing potential of substantially one-half the dc supply voltage across said inductor by turning on one of said auxiliary switching devices; (b) allowing current in said inductor to increase to the load current level and displace the load current flowing through said opposing one of said antiparallel diodes; (c) turning on said other one of said main switching devices so as to enable the current through said inductor to increase to a predetermined boost current threshold above the load current level; (d) turning off said other one of said main switching devices when current therethrough reaches said predetermined boost current threshold, thereby allowing said resonant circuit to resonate from the voltage level of one of said rails of said dc supply to the voltage level of the opposite rail thereof; (e) clamping the output voltage of the respective inverter phase to the voltage level of the opposite rail of said dc supply by forward biasing the other one of said antiparallel diodes; (f) turning on said one of said main switching devices when the voltage thereacross is substantially zero; (g) allowing the current through said inductor to decrease to substantially zero; and ( (h) turning off said one of said auxiliary switching devices when the current therethrough is substantially zero; whereby the load current flows through said one of said main switching devices.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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연합인증

Method for controlling a power converter using an auxiliary resonant commutation circuit 원문보기

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Method for controlling a power converter using an auxiliary resonant commutation circuit 원문보기

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이 특허를 인용한 특허 (48)

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