Patent ID: 6075345
Filing Date: 2000-06-13
Classification: H02J

Abstract:
A switching apparatus, comprising:a first input terminal receiving a first power from a first power supply;an output terminal outputting an output power;a first diode having a first anode and a first cathode, said first anode being coupled with said first input terminal, said first cathode being coupled with said output terminal;a second diode having a second anode and a second cathode said second diode being coupled in parallel with said first diode, said second anode being coupled with said first input terminal, said second cathode being coupled with said output terminal;a first transistor having a control electrode, a first electrode of a principal electrically conducting channel connected to said first input terminal and said first and second anodes, and a second electrode of said principal electrically conducting channel connected to said output terminal and said first and second cathodes, a drop voltage across said first and second electrodes being lower than a drop voltage across said first diode;a voltage detector detecting when a voltage of said first power is higher than a reference voltage and generating a detection signal as a result of said detecting; anda first controller receiving said detection signal and controlling said first transistor in response to said detection signal, said first controller switching said first transistor on and said first power being conveyed to said output terminal via said first transistor when said voltage of said first power is higher than said reference voltage.