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专利名称：Dual-input, automatic-switching power
supply
发明人：CURT G. NESBITT,JOSEPH B.
SKORJANEC,MICHAEL B. PULIZZI
申请号：AU7330800申请日：20000818公开号：AU7330800A公开日：20010827
摘要：A dual-input, automatic-switching power supply comprises a primary powerinput, a secondary power input, and a power output. Included are first and second DPSTmechanical relays and a third DPDT mechanical relay. A first relay input is connected tothe primary power input and a corresponding first relay output is connected to a thirdrelay input. A second relay input is connected to the secondary power input and acorresponding second relay output is connected to a different third relay input. The thirdrelay output is connected to the power output. The relays in combination provide a relaymoving contact gap spacing, source to source, of at least three millimeters. A first undervoltage control module maintains the first and third relays in states causing the primarypower input to be connected to the power output as long as voltage from the primarypower input remains above a preestablished primary voltage dropout level. A secondunder voltage control module maintains the second relay in a state causing the
secondary power input to be connected to the second input pin of the third relay as longas voltage from the secondary power input remains above a preestablished secondaryvoltage dropout level. A flip-flop is used to automatically switch the third relay to a state
causing the primary power input to be disconnected from, and the secondary powerinput to be connected to the power output when the primary power input voltage dropsbelow the primary voltage dropout level.
申请人：PULIZZI ENGINEERING, INC.
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