POWER SUPPLY CIRCUIT AND LUMINAIRE
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United States of America Patent
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Issued Date -
Apr 2, 2015
app pub date -
Feb 25, 2014
filing date -
Sep 27, 2013
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Abandoned
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Abstract
A power supply circuit includes a bridge circuit, a transformer, and a rectifying and smoothing circuit. The bridge circuit includes at least one switching element and converts a direct-current voltage into an alternating-current voltage according to ON and OFF of the switching element. The transformer includes a primary winding wire and a secondary winding wire. The rectifying and smoothing circuit converts the alternating-current voltage into a direct-current output voltage and supplies the direct-current output voltage to a direct-current load. When the number of turns of the primary winding wire is represented as N1, the number of turns of the secondary winding wire is represented as N2, a voltage value of the direct-current voltage is represented as VDC, and a lower limit value of the output voltage is represented as Vmin, a turn ratio of the primary winding wire and the secondary winding wire is about N1:N2=(VDC/2):Vmin.
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