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公开(公告)号：US5049805A
公开(公告)日：1991-09-17
申请号：US529030
申请日：1990-05-25
CPC分类号： H02J7/0026 , G05F1/577 , G06F1/28 , G06F1/305 , H02J7/0031 , H02J9/061 , Y10T307/625 , Y10T307/735
摘要： An apparatus which connects/disconnects battery from a load such as a computer system includes a first circuit arrangement which sets a first reference voltage level at which the energy source is connected through an FET device to the computer system, a second circuit arrangement that sets a second voltage level at which the energy source is disconnected by the FET device from the computer system and a third circuit arrangement which controls the FET device so that said FET device is forced into either its ON or OFF state once one of the reference voltages is reached. A second apparatus which reduces power dissipation in a battery charger power device by forcing the input voltage to track the battery voltage as the battery charges/discharges.
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公开(公告)号：US5089947A
公开(公告)日：1992-02-18
申请号：US546209
申请日：1990-06-29
CPC分类号： H02M3/33507
摘要： A full reset flyback regulator includes a power transformer having a primary winding and at least one secondary winding coupled to a load. A single control winding on a primary side of the power transformer is coupled through control circuitry to a gate electrode of a switching device that is connected to the primary winding. The voltage polarity on the control winding alternates so that if the switching device is "ON" a drive voltage is provided on its gate electrode and if the switching device is "OFF" a bias voltage is provided to the error amplifier control circuit. Each cycle of the regulator is initiated via a sync pulse which is provided from the high voltage flyback transformer of a display or monitor subsystem.
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