Linear solid-state lighting compatible with ballasts in double ends and operable with AC mains in a single end
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United States of America Patent
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May 30, 2017
Grant Date -
Oct 27, 2016
app pub date -
Jun 30, 2016
filing date -
Jun 15, 2012
priority date (Note) -
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Abstract
A linear light-emitting diode (LED) tube lamp using a six-diode combination and a ballast compatible and AC mains operable (BA) LED driving circuit operate normally with AC mains in a single end and with an electronic ballast in double ends. The BA LED driving circuit configured to operate in a wide range of input voltages and frequencies, especially for various high voltages and high frequencies associated with various electronic ballasts to provide a regulated power and a current from either electronic ballast or AC mains. With a cycle-by-cycle current control and power switching at a constant on-time and varied off-time, an over-rated surge current is limited, preventing occasional fire hazards occurred in the ballast. An additional frequency sensitive device is used to prevent a possible electric shock from occurring for both configurations during initial installation and re-lamping, thus no shock protection switches needed.
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