High speed load transfer system

专利名称：High speed load transfer system发明人：Alfred M. Hase申请号：US07/091022申请日：19870831公开号：US05142163A公开日：19920825

摘要：A high speed load transfer system for use with critical loads, e.g. computers,includes a high speed transfer logic circuit which has rapid sensing and rapid contactorenergizing means; so that in the event of power failure, power to the critical load can beswitched instantaneously to an alternative power supply. A solid state sensor, responsiveto a step change, detects instantaneous power failure and operates an output to acontactor. A voltage doubler circuit using an AC input capacitor and a DC outputcapacitor is provided at the contactor, with the DC capacitor connected across thecontactor; so that when a transfer signal is received at the contactor, the DC capacitor isdischarged across the contactor, so as to provide a surge of power through the switchmeans when the switch means closes and to minimize contactor response time--as well asto ensure connection to the critical load. The power supply can be a commercial AC line,or a hot standby inverter. In one embodiment, a differential voltage sensor is provided inparallel with the step sensor to sense voltage failure such as brown-outs, or failureswithin a set time interval e.g., 2-4 msec after the event. In another embodiment, aninverter voltage sensing circuit is provided for switching power from the inverter to abypass AC line in the event of overload.

申请人：HASE; ALFRED M.

代理人：Donald E. Hewson

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