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Title:
CHARGER
Document Type and Number:
Japanese Patent JPH0646535
Kind Code:
A
Abstract:

PURPOSE: To improve harmonic distortion in a capacitor input type rectifier circuit by employing a switching power supply at a power converting section of a boosting charger.

CONSTITUTION: The charger comprises an AC input rectifier D1, a switch SW1 performing high frequency switching of rectified pulsating current, a transformer T1 transmitting the pulsating primary power to the secondary, rectifying/ smoothing circuits D2, D3, C1, CO for rectifying/smoothing the secondary power to produce DC current for charging a battery, a charge control circuit 3 producing a charging current control command, a current detecting circuit 2, and a circuit 1 for controlling the switch SW1 with a predetermined frequency and pulse width. Furthermore, full-wave rectified pulsating AC input waveform is subjected to high frequency switching with a pulse width limited by a current detecting circuit 2 thus widening the conduction angle of input current, suppressing harmonic distortion, and improving power factor.


Inventors:
Kikuchihara, Tsutomu
Application Number:
JP1992000155921
Publication Date:
February 18, 1994
Filing Date:
May 22, 1992
Export Citation:
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Assignee:
TAMURA SEISAKUSHO CO LTD
International Classes:
G05F1/10; H02J7/10; H02M1/12; H02M3/28; H02M7/06; H02M7/12; H02M7/21; (IPC1-7): H02J7/10; G05F1/10; H02M1/12; H02M3/28; H02M7/06; H02M7/21
Domestic Patent References:
JPH03203527A
Attorney, Agent or Firm:
高山 道夫