H - Electricity – 02 – J
Patent
H - Electricity
02
J
320/4, 323/5
H02J 9/04 (2006.01) H02J 7/00 (2006.01) H02J 9/06 (2006.01)
Patent
CA 1246670
ABSTRACT OF THE DISCLOSURE Power supplies are known which normally derive power from commercial AC power mains but, in the event of a power inter- ruption, switch over to battery power. The switch-over is accom- plished by a relay which results in a brief interruption in the output of the power supply. This interruption cannot be toler- ated in some applications, e.g. computing devices and electronic cash registers. The present invention avoids this problem by providing an inverter which is normally connected to the output of a rectifier connected to the AC mains and also to a battery. During normal operation the battery is charged by a charger cir- cuit. In the event of a mains interruption, the battery continues to power the inverter with no interruption of the AC output of the power supply. If the rectifier voltage drops below a predetermined level, the battery is disconnected so as not to discharge it. If the output of the inverter drops below another predetermined level, the load is connected directly to the AC mains.
455780
Oulton David B.
Reginato Vittorino E.
Fetherstonhaugh & Co.
Pylon Electronic Development Company Ltd.
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