Invention Grant
US09307606B2 Light emitting device driver circuit and control circuit and control method thereof
有权
发光装置驱动电路及其控制电路及其控制方法
- Patent Title: Light emitting device driver circuit and control circuit and control method thereof
- Patent Title (中): 发光装置驱动电路及其控制电路及其控制方法
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Application No.: US14792909Application Date: 2015-07-07
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Publication No.: US09307606B2Publication Date: 2016-04-05
- Inventor: Chang-Yu Wu , Wei-Ming Chiu
- Applicant: Chang-Yu Wu , Wei-Ming Chiu
- Applicant Address: TW Zhubei, Hsinchu
- Assignee: RICHTEK TECHNOLOGY CORPORATION
- Current Assignee: RICHTEK TECHNOLOGY CORPORATION
- Current Assignee Address: TW Zhubei, Hsinchu
- Agency: Tung & Associates
- Main IPC: H05B33/08
- IPC: H05B33/08

Abstract:
The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit is used for driving a light emitting device circuit according to a rectified dimming signal. The light emitting device driver circuit includes a power stage circuit and a control circuit. The control circuit includes a pulse width modulation (PWM) circuit, a current limit (CL) circuit, and a determination circuit. The CL circuit generates a CL signal according to a current sense signal and a predetermined CL threshold. The determination circuit is coupled to the PWM circuit and the CL circuit, for generating an operation signal according to a PWM signal and the CL signal. The power stage circuit maintains an absolute level of an AC dimming current not lower than a holding current in an ON phase period.
Public/Granted literature
- US20160021715A1 LIGHT EMITTING DEVICE DRIVER CIRCUIT AND CONTROL CIRCUIT AND CONTROL METHOD THEREOF Public/Granted day:2016-01-21
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