CHARGING CIRCUIT STRUCTURE OF STORAGE BATTERY CHARGER MOUNTED ON WORK VEHICLE AND CHARGING CIRCUIT CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a charging circuit structure of a storage battery charger mounted on a work vehicle which generates a current distortion of a commercial power supply in the process of converting AC voltage into DC voltage and which removes defects of a filter device provided to reduce a current distortion by commercial frequency which prevents generation of electromagnetic interference due to a harmonic current in a peripheral electric device, and a charging circuit control method.SOLUTION: In order to reduce a harmonic current, which is a defect of the previous charging circuits, an AC current of 50/60 Hz, which does not have much harmonic component, is input from a commercial power supply by a PFC circuit, and the control is done by a switch control of high frequency. Because the switch frequency is high, a filter circuit to prevent a harmonic current can be produced to be small and light, and the circuit voltage is maintained so that the charging circuit can operate normally even when the input commercial voltage is different voltage (100 V or 200 V).