Patent ID: 6680641
Filing Date: 2004-01-20
Classification: H01L

Abstract:
A bidirectional bipolar transistor switch arrangement comprising a current sensing resistance means of predetermined value connected between a first node and a second node, a first bipolar transistor whose base element is connected to said first node and whose emitter element is connected to said second node, and a second bipolar transistor whose base element is connected to said second node and whose emitter element is connected to said first node, the first and second bipolar transistor's respective collector elements being connected together at a third node, said switch arrangement's connection means being formed by said second node and said third node, whereby when direct current is caused to flow between said first node and said second node through said current sensing resistance means to produce a voltage across the first and second nodes of a magnitude such that, depending on its polarity, either said first transistor or said second transistor is turned on thereby in a forward and reverse conduction mode, thereby providing an AC conducting path between said connection means via the turned on transistor's emitter/collector junction.