[특허]Power inverter for generating voltage regulated sine wave replica

Power inverter for generating voltage regulated sine wave replica 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02M-001/12
출원번호	US-0878639 (1992-05-05)
발명자 / 주소	Thomas Gregory H. (Bothell WA)
출원인 / 주소	Trace Engineering (Arlington WA 02)
인용정보	피인용 횟수 : 46 인용 특허 : 0

초록 ▼

A power inverter formed by several transformers having their secondary windings wired in series and their primary windings connected to respective switching bridges. The turns ratios of each of the primary windings vary from each other by a factor of 3 to provide good voltage resolution over a wide dynamic range. The switching bridges are controlled by a decoder and timing circuit which is, in turn, controlled by a microprocessor. The microprocessor closes the switches in the switching bridges in up to 27 different combinations to produce 27 different output voltages, thereby generating a relatively accurate replica of a sine wave. Voltage regulation is accomplished by sampling the A.C. voltage, comparing the magnitude of the A.C. voltage to a reference voltage, and adjusting the selection of output voltage values so that the A.C. voltage matches the reference voltage. The switching bridge may also be controlled to convert an A.C. voltage applied to the transformer secondaries to a D.C. voltage for battery charging purposes.

대표청구항 ▼

A power inverter for converting a D.C. voltage applied between first and second D.C. terminals to an A.C. voltage having a predetermined frequency and amplitude generated between first and second A.C. terminals, said inverter comprising: a plurality of transformers, each having a primary transformer winding coupled to a secondary transformer winding by a respective turns ratio, the secondary transformer windings for all of said transformers being connected in series with each other between said A.C. terminals such that the voltage across said A.C. terminals is proportional to the sum of the products of the turns ratio of each of said transformers and the voltage applied thereto; switch means connected between said D.C. terminals and the said primary transformer winding for each of said transformers, the switch means for each of said transformer windings being controllable by a respective set of control signals between an off state in which said primary transformer winding is shorted, a positive state in which said primary transformer winding is connected between said D.C. terminals in one direction, and a negative state in which said primary transformer winding is connected between said D.C. terminals in the opposite direction, thereby causing the voltages across the secondary transformer windings to be either positive, zero or negative, said switch means including a switching bridge formed by first and second pairs of series-connected semiconductor switches, each pair of said switches being connected in parallel between said first and second D.C. terminals, with said primary transformer winding being connected between the junctions between the semiconductor switches in said pairs, and wherein said control signals applied to said switch means during said positive state close the semiconductor switch in said first pair that is connected to said first D.C. terminal, close the semiconductor switch in said second pair that is connected to said second D.C. terminal, and open the remaining semiconductor switches, thereby causing current to flow through said primary transformer winding in one direction, and wherein said control signals applied to said switch means during said negative state close the semiconductor switch in said first pair that is connected to said second D.C. terminal, close the semiconductor switch in said second pair that is connected to said first D.C. terminal, and open the remaining semiconductor switches, thereby causing current to flow through said primary transformer winding in the opposite direction; and control means connected to said switch means for generating said control signals and applying said control signals to said switch means, said control means generating 3N combinations of said state control signals as a function of time, where N is the number of said primary transformer windings, said combinations of said control signals being generated to cause the A.C. signal generated across said A.C. terminals to approximate a predetermined waveform, said control means including decoder means for applying said control signals to each series-connected pair of said semiconductor switches, said decoder means generating control signals that cause both semiconductor switches in each pair to be off for a predetermined period each time said switch means are switched to a positive state or a negative state, thereby preventing both semiconductor switches in a pair to be simultaneously closed.

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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

Power inverter for generating voltage regulated sine wave replica 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (46)

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연합인증

Power inverter for generating voltage regulated sine wave replica 원문보기

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연구과제 타임라인

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이 특허를 인용한 특허 (46)

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