LED DRIVE CIRCUIT - DONG GUAN NAT STATE LIGHTING CO LTD

Title:

LED DRIVE CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2016/109919

Kind Code:

A1

Abstract:

The present invention relates to an LED drive circuit, comprising an alternating current-direct current conversion unit, a transformer, a Q1 and a negative feedback unit between an emitter and a collector. A base of the Q1 is electrically connected to an R10 and a negative output end of the alternating current-direct current conversion unit in sequence. A C10, an R5 and a transformer winding T1B are further connected in series between the base of the Q1 and the negative output end of the alternating current-direct current conversion unit. A transformer winding T1A is electrically connected between the connector of the Q1 and a positive output end of the alternating current-direct current conversion unit. The base of the Q1 is further electrically connected to an R9, a reverse D2 and the positive output end of the alternating current-direct current conversion unit in sequence. A negative output end of the present circuit is electrically connected between the R9 and the reverse D2. An emitter of the Q1 is electrically connected to an R1 and the negative output end of the alternating current-direct current conversion unit in sequence. The connector of the Q1 is further electrically connected to a D1 and a positive output end of the present circuit in sequence. An R12 and a filter capacitor CE1 are further connected in parallel between the positive output end of the present circuit and the positive output end of the alternating current-direct current conversion unit. Such a circuit does not need an IC and has low costs.

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Inventors:

MOON DAISUNG (KR)
MOON SANGPIL (KR)

Application Number:

PCT/CN2015/070096

Publication Date:

July 14, 2016

Filing Date:

January 05, 2015

Export Citation:

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Assignee:

DONG GUAN NAT STATE LIGHTING CO LTD (CN)

International Classes:

H05B37/02; H05B44/00

Foreign References:

CN101227778A	2008-07-23
CN202634839U	2012-12-26
CN203467008U	2014-03-05

Attorney, Agent or Firm:

SHENZHEN HUIBANG INTELLECTUAL PROPERTY AGENCY FIRM (CN)
深圳市惠邦知识产权代理事务所 (CN)

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