Invention Grant
- Patent Title: PWM control method and device and light adjusting device
- Patent Title (中): PWM控制方法及装置及调光装置
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Application No.: US12739504Application Date: 2008-10-24
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Publication No.: US08278834B2Publication Date: 2012-10-02
- Inventor: Nobuya Inamori
- Applicant: Nobuya Inamori
- Applicant Address: JP
- Assignee: Sumitomo Wiring Systems, Ltd.
- Current Assignee: Sumitomo Wiring Systems, Ltd.
- Current Assignee Address: JP
- Agent Gerald E. Hespos; Michael J. Porco
- Priority: JP2007-277733 20071025
- International Application: PCT/JP2008/069361 WO 20081024
- International Announcement: WO2009/054503 WO 20090430
- Main IPC: H05B41/16
- IPC: H05B41/16
Abstract:
A PWM control method increases/decreases a duty ratio of a PWM signal with a predetermined resolution so to control the duty ratio of the PWM signal in the case of a PWM control. The resolution of the duty ratio of the PWM signal is increased to make a high period in the duty ratio of the PWM signal longer than a rise time of the PWM signal if the high period is shorter than the rise time. The resolution of the duty ratio of the PWM signal is increased to make a low period in the duty ratio of the PWM signal longer than a fall time of the PWM signal if the low period is shorter than the fall time.
Public/Granted literature
- US20100253240A1 PWM CONTROL METHOD AND DEVICE AND LIGHT ADJUSTING DEVICE Public/Granted day:2010-10-07
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