发明名称 |
TRIAC DIMMABLE POWER SUPPLY UNIT FOR LED |
摘要 |
<p>A power-factor-corrected power supply adapted to supply power to one or more light emitting diodes (LEDs), comprises: a triac dimmer electrically connected between an alternating current source and a bridge rectifier; a damping circuit electrically connected between the alternating current source and the bridge rectifier; a bleeder circuit configured to conduct current between a supply terminal of the bridge rectifier and ground only when a triac in the triac dimmer is not conducting current; a fast startup circuit configured to conduct current between the supply terminal of the bridge rectifier and a voltage supply terminal of a power-factor-corrected controller when the triac dimmer is initially turned on until a supply voltage capacitor coupled to the voltage supply terminal of the power-factor-corrected controller has charged; a dimming slope control circuit configured to reduce a first voltage sensed at a current sensing terminal of the power-factor-corrected controller, such that a reduced amount of current is supplied to the one or more LEDs at a given firing angle, wherein the first voltage is representative of a current flowing through a primary winding of a flyback transformer; and a dummy load circuit provided in parallel with the one or more LEDs to draw a holding current for the triac only after the triac is turned on.</p> |
申请公布号 |
WO2011137646(A1) |
申请公布日期 |
2011.11.10 |
申请号 |
WO2010CN79474 |
申请日期 |
2010.12.06 |
申请人 |
HUIZHOU LIGHT ENGINE LTD.;LEUNG, WA-HING;SIU, KAM WAH |
发明人 |
LEUNG, WA-HING;SIU, KAM WAH |
分类号 |
H05B37/02 |
主分类号 |
H05B37/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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