Electronic ballasts with high-frequency-current blocking component or positive current feedback
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United States of America Patent
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May 27, 2014
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app pub date -
Dec 23, 2006
filing date -
Dec 23, 2006
priority date (Note) -
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Abstract
Methods and apparatus are described that can provide improved power factor correction and total harmonic distortion, efficiency and/or direct feedback of load current variations to a power source inverter. In one example, a power supply, for example, a ballast, can have an input circuit, an output circuit and an inverter circuit coupled between the input circuit and the output circuit. A current feedback circuit is coupled between the output circuit and the inverter circuit and configured to feed current back to the inverter circuit through a transformer stage separate from the inverter as a function of a current level in the output circuit.
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