- 专利标题: Control of light intensity using pulses of a fixed duration and frequency
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申请号: US12466688申请日: 2009-05-15
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公开(公告)号: US08421368B2公开(公告)日: 2013-04-16
- 发明人: Bassam D. Jalbout , Brian Wong
- 申请人: Bassam D. Jalbout , Brian Wong
- 申请人地址: US OH Cincinnati
- 专利权人: LSI Industries, Inc.
- 当前专利权人: LSI Industries, Inc.
- 当前专利权人地址: US OH Cincinnati
- 代理机构: McDermott Will & Emery LLP
- 主分类号: H05B37/02
- IPC分类号: H05B37/02
摘要:
A method and circuit to control the intensity of lights, illumination fixtures, and displays using pulses of a fixed duration and a fixed frequency (FD/FF) is provided. In particular, the method may be used to control one more light sources. By varying the number of pulses in a control burst, the total current flowing through the light source may be precisely controlled providing greater accuracy than other methods, such as, for example, PWM or variable pulse frequency. The FD/FF technique may be used in conjunction with any number of light sources, and finds particular application in LED displays and for any type of LED illumination fixture.