[특허]Power factor correction controlled boost converter with an improved zero current detection circuit for operation under h

Power factor correction controlled boost converter with an improved zero current detection circuit for operation under h 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G05F-001/10
출원번호	US-0565268 (1995-11-30)
발명자 / 주소	Sodhi Sameer
출원인 / 주소	Motorola, Inc.
대리인 / 주소	Cunningham
인용정보	피인용 횟수 : 26 인용 특허 : 0

초록 ▼

An electronic power supply circuit (12) having a rectifier circuit (18) adapted to receive a source of alternating current (10), a power factor correction driven boost converter (20), and a bulk capacitance (22). The boost converter (20) includes a boost transformer (24) having a primary winding (32) and a secondary winding (34), a boost switch (26), a boost diode (28), a zener diode (46), and a power factor correction control circuit (30) having a zero current detect input (58). The presence of the zener diode (46) effectively adds a fixed offset to the voltage provided to the zero current detect input (58), thereby allowing the boost converter (20) to operate under high input line voltage conditions. The zener diode (46) may be oriented in various ways, and may be incorporated into an integrated circuit containing other elements of the power factor correction control circuit (30). One particular embodiment of the power supply circuit (12) is for use in an electronic ballast (70) for fluorescent lamps.

대표청구항 ▼

[ What is claimed is:] [1.] An electronic power supply circuit, comprising:a rectifying circuit having a pair of input terminals for receiving a source of alternating current and having a pair of output terminals;a boost converter having a pair of input terminals and having a pair of output terminals, the input terminals of the boost converter being coupled to the output terminals of the rectifying circuit, the boost converter comprising:a boost transformer having a primary winding and a secondary winding, the primary winding being coupled between a first node and a second node, the first node being coupled to a first input terminal of the boost converter;a boost switch coupled between the second node and a third node, the third node being coupled to a second input terminal of the boost converter and a second output terminal of the boost converter, the boost switch having an on state in which a current flows from the second node to the third node, and an off state in which no current flows from the second node to the third node;a boost rectifier coupled between the second node and a fourth node, the fourth node being coupled to a first output terminal of the boost converter;a power factor correction control circuit for driving the boost switch, the power factor correction control circuit having a zero current detect input and being operable to drive the boost switch into the on state in response to a voltage at the zero current detect input falling below a predetermined zero current detect threshold;a zero current detection circuit for providing to the zero current detect input of the power factor correction control circuit a voltage that is representative of the current flowing in the primary winding of the boost transformer when the boost switch is in the off state, the zero current detection circuit comprising the secondary winding of the boost transformer and a zener diode, the zener diode having an anode and a cathode, the zener diode being coupled between the third node and a fifth node, the secondary winding of the boost transformer being coupled between the fifth node and a sixth node, the sixth node being coupled to the zero current detect input of the power factor correction control circuit, the primary and secondary windings of the boost transformer being oriented in relation to each other such that a non-negative voltage is present from the fifth node to the sixth node while the boost switch is in the on state; anda bulk capacitance that is coupled across the output terminals of the boost converter, the bulk capacitance comprising at least one capacitor.

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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 factor correction controlled boost converter with an improved zero current detection circuit for operation under h 원문보기

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Power factor correction controlled boost converter with an improved zero current detection circuit for operation under h 원문보기

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이 특허를 인용한 특허 (26)

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