Invention Grant
- Patent Title: Current control for power converter
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Application No.: US16787343Application Date: 2020-02-11
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Publication No.: US10999905B2Publication Date: 2021-05-04
- Inventor: Hyunchul Eum , Gyumin Park , Minha Hwang
- Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
- Applicant Address: US AZ Phoenix
- Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
- Current Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
- Current Assignee Address: US AZ Phoenix
- Agency: Brake Hughes Bellermann LLP
- Main IPC: H05B45/10
- IPC: H05B45/10 ; H05B45/325 ; H05B45/38 ; H05B45/375 ; H05B45/385 ; H05B45/355 ; H02M3/156 ; H02M1/08

Abstract:
The present disclosure is related to accurate analog dimming of a light emitting diode (LED). Accurate dimming can require precise control of a power converter that supplies the LED with a current. The precise control relies on accurately sensing a level of the LED. When the power converter operates in a discontinuous conduction mode (DCM), for example at a low dimming ratio, the accuracy of the sensed LED-level can be affected by a resonant current offset, resulting from current ringing in the power converter. The disclosed circuits and methods provide accurate control of the LED-level by compensating for the resonant current offset in the sensed LED-level.
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