Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yong-Xing You0
Jin-Liang Xiong0
Xing-Jun Yang0
Date of Patent
April 17, 2007
0Patent Application Number
111438520
Date Filed
June 2, 2005
0Patent Primary Examiner
Patent abstract
A power supply switching circuit includes an input terminal (2) for receiving a signal from a motherboard, an output terminal (4) to output a control signal, a first Bipolar Junction Transistor (BJT) (5), and a second BJT (7). A base of the first BJT is connected to the input terminal via a base bleeder circuit. A collector of the first BJT is connected to a stand-by power supply terminal (10) via a collector resistor. A base of the second BJT is connected to the collector of the first BJT. A collector of the second BJT is connected to a system power supply terminal (12) via a collector resistor. The collector of the second BJT is connected to the output terminal. Emitters of the first and second BJTs are grounded.
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