Patent
Power source for emergency lighting systems
TLDR
In this article, a buck/boost converter is driven by a high frequency dc-to-dc flyback converter to provide substantially constant output power, independent of the output voltage, to an inductor to provide current to a load having a v-i characteristic that is suitable for use with a current power source, such as a plurality of parallely connected LEDs.Abstract:
A buck/boost converter is driven by a high frequency dc-to-dc flyback converter to provide substantially constant output power, independent of the output voltage, to an inductor to provide current to a load having a v-i characteristic that is suitable for use with a current power source, such as a plurality of parallely-connected LEDs. The flyback converter repetitively generates a battery-simulated output voltage that is current-limited and which may be used to charge a battery as well as to provide power to the buck/boost converter. The buck/boost converter includes a switching circuit for repetitively transferring current to the load and a current sensor circuit operating in conjunction with the switching circuit to change the state of the buck/boost converter to repetitively open the switching means and initiate release of the current to the load.read more
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Patent
Power supply for light emitting diode array
TL;DR: In this article, an apparatus for supplying regulated voltage d.c. electrical power to an LED array (12) includes a rectifier (32) responsive to a.c power failure and a power factor correcting and voltage regulating buck/boost switchmode converter (38).
Patent
LED driver circuit with PWM output
TL;DR: The driver circuit for light emitting diodes (LEDs) of the present invention provides power to LEDs using pulse width modulation (PWM), and the driver circuit 100 uses current feedback to adjust power to LED arrays 54 and provides a full light and a dim mode as mentioned in this paper.
Patent
Circuit for interfacing between a conventional traffic signal conflict monitor and light emitting diodes replacing a conventional incandescent bulb in the signal
TL;DR: In this article, a circuit for interfacing between a conventional traffic signal's control monitor and a plurality of light emitting diodes (LEDs) replacing an incandescent lamp of the traffic signal is disclosed.
Patent
Automatic transfer switch
TL;DR: In this paper, an automatic transfer switch apparatus for use with a stand-alone generator, for supplying emergency power to a residence or small business, is presented, which is configured to sense a utility line failure, start up and stabilize the generator and switch over the household circuits from the utility to the generator, and switch back when the utility recovers.
Patent
Near unity power factor long life low cost LED lamp retrofit system and method
TL;DR: In this article, the authors present various LED lamp retrofit apparatuses that maximize the electro-mechanical-optical compatibility of seven interactive systems, such as: LEDs, LED Panel, Supply Adaptor, Housing, Lens/diffuser Shield, In/Out Electrical Wiring an LED driver.
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Patent
Switching regulator power supply
TL;DR: In this paper, a switching regulator power supply for low-current applications is proposed to provide a well-regulated voltage to a volatile memory device of the general complementary metaloxide semiconductor type (CMOS) on a standby basis in the event the primary DC source is lost.
Patent
Battery backup system for switched power supply
TL;DR: In this article, a battery back-up system providing short-term hold-up for a converter type switched power supply is described, which includes a regulated charger circuit for maintaining the battery in a charged condition and a direct current fan which cools the power supply in both the normal and battery backup modes.
Patent
AC-DC Switching regulator uninterruptible power supply
TL;DR: In this paper, a switching regulator is coupled to both the AC power line and a rechargeable battery, and makes automatic transitions between AC operation and battery operation, utilizing a transistor switch and an energy storage transformer coupled with both power sources and to the load.
Patent
Uninterruptible power supply with battery back-up
TL;DR: In this paper, a charger in the form of a primary switched rectifier and transformer charges a battery and carries a load when the operating voltage is available to a sufficient extent, when a voltage drop or break in voltage automatically disconnects the battery from the charger, the load is supplied with voltage from the battery.