Patent
Self oscillation circuits
TLDR
In this paper, a small output transformer capable of producing sine wave oscillation at stability and high efficiency is presented, where a drive circuit including a switching circuit is connected to DC power source input units 12 a, 12 b, and an output transformer 10 is attached to the drive circuit.Abstract:
An object of the present invention is to provide a small size output transformer capable of producing sine wave oscillation at stability and high efficiency. A drive circuit including a switching circuit is connected to DC power source input units 12 a , 12 b , and an output transformer 10 is connected to the drive circuit. At the drive circuit, the switching circuit is turned on and off on the basis of a feedback signal of the primary side resonance voltage induced in the input side primary winding of the output transformer. The energizing direction of the DC power source to the output transformer is converted in clockwise and counter-clockwise direction by the on and off of the switching circuit, and the power source is applied as the AC signal to the input side primary winding of the output transformer. The phase detecting means detects the phase of the resonance waveform at the primary side of the output transformer 10 and outputs the phase signal. The control circuit connected to the drive circuit converts the signal of the phase detecting means to two phase signals of mutually reversal phases and outputs the drive signal for the on-off control of the switching circuit of the drive circuit.read more
Citations
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Matthias Radecker,Michael Lenz +1 more
TL;DR: In this article, a piezo transformer with an input and an output is coupled to a load, such that the output current flows through the same load, and the load is designed such that a useful power provided in the form of useful energy is substantially proportional to output current.
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Systems and methods for low-power lamp compatibility with a trailing-edge dimmer and an electronic transformer
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References
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Patent
High-efficiency adaptive DC/AC converter
TL;DR: In this paper, a CCFL power converter circuit is provided using a high-efficiency zerovoltage-switching technique that eliminates switching losses associated with the power MOSFETs.
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TL;DR: In this article, a DC-to-AC inverter is used to control the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL) by driving a symmetrical rectangular waveform into a second-order low pass filter at the resonant frequency of the filter for all conditions of line voltage and delivered power.
Patent
High frequency electronic ballast for multiple lamp independent operation
Gert W. Bruning,Chang Chin +1 more
TL;DR: An electronic ballast with a voltage-fed, LC or LLC resonant inverter for multiple gas discharge lamp independent operation which maintains a substantially constant voltage to lamps connected to the ballast even during a transition period when a lamp or lamps is ignited, extinguished, added or removed is described in this paper.
Patent
Inverter for multi-tube type backlight
Hisaharu Oura,Hironori Takaoka +1 more
TL;DR: In this article, two step-up transformers of one-side grounded type respectively output electric power to one or a plurality of cold cathode tubes, and the outputs of the two step up transformers are of identical frequency but of mutually reversed phases.
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Output protection for arc discharge lamp ballast
TL;DR: In this article, the authors apply sampled ballast current to a burden capacitor selected to present a low impedance across the winding to a substantially symmetrical waveform of the sample current, which results in charge buildup across the capacitor.