[특허]Constant brightness control for electro-luminescent lamp

Constant brightness control for electro-luminescent lamp 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G05F-001/00
출원번호	UP-0110426 (2008-04-28)
등록번호	US-7719210 (2010-06-10)
발명자 / 주소	Liang, Chih-Ping
출원인 / 주소	CeeLight, Inc.
대리인 / 주소	Connolly Bove Lodge & Hutz LLP
인용정보	피인용 횟수 : 0 인용 특허 : 81

초록 ▼

A ballast (11) includes a variable output DC converter source (12) and an inverter circuit (14) arranged to provide AC output voltage to an electro-luminescent (EL) lamp (16). A Q factor of EL lamp can characterize the age of the EL lamp. A series resonance-parallel loaded circuit and two voltage detector (18, 20) are constructed to measure the Q factor. A processor (17) controls the output of DC voltage source in accordance with a look-up table containing constant brightness algorithm based on the derived voltage and Q relationship.

대표청구항 ▼

What is claimed is: 1. A lighting device comprising: an electro-luminescent (EL) lamp; and A ballast for controlling brightness of the electro-luminescent (EL) lamp, the ballast comprising: a converter circuit that converts line AC voltage to a DC input voltage, an inverter circuit that inverts the DC input voltage to an AC output voltage, the ballast being constructed and arranged to provide the AC output voltage to the EL lamp, an input voltage detector constructed and arranged to measure the DC input voltage (Vin), an output voltage detector constructed and arranged to measure the AC output voltage (Vout), and a processor constructed and arranged to adjust Vin based on a ratio of measured values of Vout and Vin to thereby adjust brightness of the EL lamp. 2. The ballast of claim 1, wherein the inverter circuit is a half bridge, self-excited series resonance-parallel loaded circuit. 3. The ballast of claim 1, in combination with the EL lamp. 4. The ballast of claim 1, wherein a look-up table is associated with the processor, the look-up table including a quality factor Q, where Q is related to Vout/Vin, and Q relates to an age of the EL lamp. 5. The ballast of claim 4, wherein the processor is constructed and arranged to calculate Q and adjust Vin based on the look-up table. 6. The ballast of claim 4, wherein the look-up table is provided in memory of the processor. 7. A method of providing illumination, comprising: providing an electro-luminescent (EL) lamp, providing a ballast for powering the EL lamp, measuring DC input voltage (Vin) to the ballast, measuring AC output voltage (Vout) from the ballast, and adjusting Vin based on a ratio of measured values of Vout and Vin to thereby adjust brightness of the EL lamp. 8. The method of claim 7, wherein the method further includes: establishing a relationship between age of the EL lamp and a quality value Q, calculating Q, and the step of adjusting Vin includes adjusting Vin based on the relationship between Q and the age of the EL lamp. 9. The method of claim 8, further including controlling an end of lamp life by shutting-off the EL lamp based on an age of the EL lamp. 10. The method of claim 8, thither including controlling an end of lamp life of the EL lamp by accelerating a decay of the brightness of the EL lamp based on an age of the EL lamp. 11. The method of claim 8, further including displaying remaining lamp life at a set brightness level on the ballast. 12. The method of claim 8, wherein the step of adjusting Vin is performed automatically by a controller. 13. The method of claim 8, wherein the step of adjusting Vin is performed manually. 14. The method of claim 8, wherein the relationship is provided in a look-up table associated with a processor, the step of adjusting Vin being performed by the processor. 15. The method of claim 14, wherein the look-up table is provided in memory associated with the processor.

이 특허에 인용된 특허 (81)

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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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메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
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연합인증

Constant brightness control for electro-luminescent lamp 원문보기

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연합인증

Constant brightness control for electro-luminescent lamp 원문보기

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