Patent ID: 6134131
Filing Date: 2000-10-17
Classification: H02M,Y02B

Abstract:
A rectifier apparatus for rectifying current in a selected branch of a circuit, comprising:a switch device including a control terminal, a first switch terminal and a second switch terminal;a first diode with its anode connected to said first switch terminal and its cathode connected to said second switch terminal;an input terminal;an output terminal attached to a node joining the cathode of said first diode and second switch terminal of said switch device;a transformer comprising a plurality of windings each with two terminals;a first winding of said transformer attached to said input terminal;a second winding of said transformer has one of its terminals connected to a terminal of said first winding and another terminal coupled to the control terminal of said switch device;a third winding of said transformer and a fourth winding of said transformer connected together at a node;a second diode having its anode connected to said third winding;a third diode having its anode connected to said fourth winding;a positive terminal which couples the cathodes of said second diode and said third diode together;a negative terminal connected to said node joining said third winding and fourth winding;said positive terminal and said negative terminal being attached to a voltage source;magnetic means to couple the first, second, third and fourth windings of said transformer such that when said switch turns on energy is transferred from said first winding to said third winding while voltage across said second winding is kept substantially constant by said voltage source during this on period; andmagnetic means to couple magnetizing energy of said transformer to said voltage source through said fourth winding when said switch turns off while voltage across said second winding is dept substantially constant by said voltage source during this off period.