Invention Grant
- Patent Title: Dimmable instant start ballast
- Patent Title (中): 可调光即时启动镇流器
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Application No.: US13352429Application Date: 2012-01-18
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Publication No.: US08547029B2Publication Date: 2013-10-01
- Inventor: Nitin Kumar , Shashank Bakre , Driss Baba
- Applicant: Nitin Kumar , Shashank Bakre , Driss Baba
- Applicant Address: US MA Danvers
- Assignee: OSRAM SYLVANIA Inc.
- Current Assignee: OSRAM SYLVANIA Inc.
- Current Assignee Address: US MA Danvers
- Agent Shaun P. Montana
- Main IPC: H05B37/00
- IPC: H05B37/00

Abstract:
A ballast for dimming a lamp is provided. The ballast includes an inverter circuit for providing a lamp current for energizing the lamp and a dim interface for receiving an input indicative of a selected lighting level. A control circuit is connected to the dim interface for generating a pulse-width-modulated signal having a duty cycle corresponding to the selected lighting level. A switching network is connected to the control circuit for receiving the pulse-width-modulated signal. The switching network operates between a conductive state and a non-conductive state as a function of the pulse-width-modulated signal. An impedance device is connected across the switching network and is configured for connecting in series with the lamp so that the impedance device receives the lamp current when the switching network is operating in the non-conductive state and the lamp current bypasses the capacitor when the switching network is operating in the conductive state.
Public/Granted literature
- US20130181627A1 DIMMABLE INSTANT START BALLAST Public/Granted day:2013-07-18
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