Invention Grant
- Patent Title: LED-based emergency lighting equipment and methodology
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Application No.: US15597491Application Date: 2017-05-17
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Publication No.: US10794555B2Publication Date: 2020-10-06
- Inventor: Lei Han , John Evan Lane
- Applicant: Hubbell Incorporated
- Applicant Address: US CT Shelton
- Assignee: Hubbell Incorporated
- Current Assignee: Hubbell Incorporated
- Current Assignee Address: US CT Shelton
- Agency: Michael Best & Friedrich, LLP
- Main IPC: H02J7/00
- IPC: H02J7/00 ; H02J7/04 ; H02J9/06 ; H03K5/24 ; F21S9/02 ; F21V29/507 ; F21V29/74 ; F21V21/30 ; H05B45/37 ; H05B45/50 ; H02J7/02 ; F21Y115/10

Abstract:
Systems and methods provide LED-based emergency lighting utilizing AC-DC switch mode power conversion technology, NiMH battery technology, and emergency lighting lamps that use high power white LEDs as the emergency lighting source. A low voltage microprocessor based circuit design reduces the battery input voltage for the unit to a nominal level of 2.4VDC. The microprocessor executes a pulse charging algorithm to lower battery maintenance mode power consumption levels and extend the useful life of the battery. Brownout detection technology does not require the determination of the AC input voltage level or transmission of the brownout detection signal to the secondary side of the circuit. A rechargeable battery is charged by a charge current selectively set to a bulk charge value, a trickle charge high value, or a trickle charge low value based on sampling of the voltage of the rechargeable battery and the charge current.
Public/Granted literature
- US20170250569A1 LED-BASED EMERGENCY LIGHTING EQUIPMENT AND METHODOLOGY Public/Granted day:2017-08-31
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