发明名称 |
LED CONTROL USING MODULATION FREQUENCY DETECTION TECHNIQUES |
摘要 |
A light emitting diode (LED) controller for controlling a plurality of LED channels includes channel select circuitry, detection circuitry, and error processor circuitry. The channel select circuitry is configured to drive N−1 LED channels of a plurality of (N) LED channels at a nominal modulation frequency and to selectively drive a selected one of the N LED channels at a probe modulation frequency. The detection circuitry is configured to receive a composite brightness signal corresponding to brightness signals from the N LED channels. The detection circuitry is further configured to filter the composite bright signal and generate a selected brightness signal corresponding to a brightness of the selected LED channel at the probe modulation frequency. The error processor circuitry is configured to compare the selected brightness signal to user defined and/or preset photometric quantities and generate a control signal for adjusting the brightness of the selected LED channel. |
申请公布号 |
US2012049745(A1) |
申请公布日期 |
2012.03.01 |
申请号 |
US201113077669 |
申请日期 |
2011.03.31 |
申请人 |
LI MING;DENVIR KERRY;MOSKOWITZ PHILIP E.;OSRAM SYLVANIA INC. |
发明人 |
LI MING;DENVIR KERRY;MOSKOWITZ PHILIP E. |
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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