Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1997-05-22
1998-12-08
Sterrett, Jeffrey
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323282, 363 16, G05F 1613
Patent
active
058475508
ABSTRACT:
This invention allows conversion from AC or DC line voltage between 70 and 424 volts to small loads between 2.5V and 18V DC for charging of batteries and operating of small loads. The invention uses a topology including two flyback stages in tandem. This invention has many uses and we are believed to be the first to apply it to battery charging and the operation of small loads. The invention is very cost effective and has feedback both from the input line voltage and output voltage to allow different loads and to allow the universal voltage input. The invention operates at high frequency and thus eliminates large transformers and uses surface mount components. All of this results in its very small size, low heat generation, and high efficiency. The invention draws very little power when connected only to a battery without the AC having been cycled. Primary applications for this invention include low powered uninterrupted power supply (UPS) devices. As disclosed herein, our first application is an emergency lighting device combined with an exit sign. However, we may use the same power supply for lighting equipment, lighting sensors, smoke detectors, burglar alarms, passive receivers, infrared detectors, ultrasonic detectors, stand-alone battery chargers, communications equipment or any other device which has a small load or requires charging with a battery from high input line voltages, such as 120V and higher.
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Application Notes published by Unitrode on pulse switching integrated circuits, Type UCC3889 and related types, comprising 22 pages of copies, Sep. 1996.
Rekowski James A.
Schie David
Juno Lighting, Inc.
Palmatier Francois N.
Sterrett Jeffrey
Zummer Anthony S.
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