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A constant-power battery charger with inherent soft switching and power factor correction

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3 Author(s)
Poon, N.K. ; Dept. of Electr. & Electron. Eng., Univ. of Hong Kong, China ; Pong, B.M.H. ; Tse, C.K.

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.

Published in:

Power Electronics, IEEE Transactions on  (Volume:18 ,  Issue: 6 )

Date of Publication:

Nov. 2003

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