Pulse charging method and a charger

摘要

PCT No. PCT/JP97/01721 Sec. 371 Date Jan. 21, 1998 Sec. 102(e) Date Jan. 21, 1998 PCT Filed May 21, 1997 PCT Pub. No. WO97/44878 PCT Pub. Date Nov. 27, 1997The present invention relates to a pulse charging method and charging system for use with non-aqueous secondary batteries, employing a pulse charge controlling method all the way from the start to the end of charging. This pulse charging method has an on-duty ratio of pulses in a next specified charge period reduced when an average battery voltage has exceeded a charge control voltage during a specified charge period, has an on-duty ratio of pulses in a next specified charge period increased when the average battery voltage has not exceeded the charge control voltage and has the pulse charging ended when an on-duty ratio of pulses has reached a specified value. The pulse charging system comprises an on-duty ratio reducing means for having an on-duty ratio of pulses reduced, an on-duty ratio increasing means for having an on-duty ratio increased and a means for determining pulse charge ending for having the pulse charging ended when an on-duty ratio of pulses has reached a specified value. Thus, it has become possible to provide a charging system that can be built in a battery pack, is inexpensive, free of heat generation and, in addition, allows the charging time to be reduced.