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Title of article :
A constant-power battery charger with inherent soft switching and power factor correction
Author/Authors :
C.K.، Tse, نويسنده , , N.K.، Poon, نويسنده , , B.M.H.، Pong, نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
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Abstract :
A battery charging circuit, which operates as a constant power source, is proposed in this paper. By maintaining a constant output power throughout the charging process, the circuit reduces the size of thermal installation which would normally be required in the cases of constant-voltage or constant-current charging. The proposed circuit takes the form of a half-bridge converter with an additional small inductor and two extra diodes connected in parallel to two dividing capacitors. Constant power delivery is achieved by the discontinuous-voltage-mode operation of the two dividing capacitors, each of which is connected in parallel with a diode. The circuit enjoys low voltage and current stresses, and achieves soft switching with no extra components. When used off-line, the converter maintains a high input power factor and a low level of input current harmonic distortion that meets international regulations. All the above characteristics are determined only by the values of the circuit parameters, the control mechanism being noncritical. A 12 V 65 W prototype was built to demonstrate the merits of this circuit.
Keywords :
Abdominal obesity , Food patterns , waist circumference , Prospective study
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