Invention Grant
- Patent Title: Lamp end of life (EOL) detection circuit
- Patent Title (中): 灯寿命终止(EOL)检测电路
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Application No.: US12986596Application Date: 2011-01-07
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Publication No.: US08410713B2Publication Date: 2013-04-02
- Inventor: Nitin Kumar , Shashank Bakre , Christian Breuer
- Applicant: Nitin Kumar , Shashank Bakre , Christian Breuer
- 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: H05B41/16
- IPC: H05B41/16 ; H05B41/24 ; H05B37/00 ; H05B39/00 ; H05B41/14 ; H05B37/02 ; H05B39/02 ; H05B39/04

Abstract:
A lamp driver circuit to selectively energize one or more lamps is provided. The inverter circuit has a transformer with primary and secondary windings to provide voltage to the lamps. A filter is connected to the primary winding to receive a primary winding signal representative of the voltage across the primary winding. The primary winding signal has a frequency spectrum and the filter detects a particular characteristic of the frequency spectrum that is indicative of an end of life (EOL) condition of the one or more lamps. A control circuit is connected to the inverter circuit and to the filter. The control circuit is configured to discontinue energizing of the one or more lamps by the inverter circuit when the particular characteristic of the frequency spectrum of the primary winding signal is detected by the filter.
Public/Granted literature
- US20110163685A1 Lamp End of Life (EOL) Detection Circuit Public/Granted day:2011-07-07
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