Invention Grant
- Patent Title: Dimming electronic ballast with preheat current control
- Patent Title (中): 调光电子镇流器具有预热电流控制
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Application No.: US12547072Application Date: 2009-08-25
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Publication No.: US08294384B2Publication Date: 2012-10-23
- Inventor: Kenji Matsuda
- Applicant: Kenji Matsuda
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Waddey & Patterson, P.C.
- Agent Mark J. Patterson; Gary L. Montle
- Priority: JP2008-215809 20080825
- Main IPC: H05B41/16
- IPC: H05B41/16

Abstract:
An electronic ballast is capable of realizing high frequency lighting of a discharge lamp and switching between at least two lighting modes with different light outputs. The ballast includes a preheating circuit having a winding component connected in parallel with a main resonant circuit with a lamp current flowing therein for the discharge lamp. A constant preheating current for the lamp filaments is supplied from a secondary winding of the winding component during lighting of the discharge lamp and a path of a current flowing on a primary winding side of the winding component is switched by a switch according to the lighting mode.
Public/Granted literature
- US20100109548A1 DIMMING ELECTRONIC BALLAST WITH PREHEAT CURRENT CONTROL Public/Granted day:2010-05-06
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