Single-Ended Forward Converter

Abstract

A single-ended forward converter of the present invention, has first and second switching element comprises a pair Lus N-Channel FET, a first driving circuit comprises the series-connected circuit of the first voltage drop resistor and first zener diode for driving first Lus N-Channel FET, a second driving circuit comprises the series-connected circuit of the second voltage drop resistor and second zener diode for driving second Lus N-Channel FET.

1 . A single-ended forward converter comprises:
 a first Lus N-Channel FET connected in series with a secondary winding of a transformer of said single-ended forward converter;   a second Lus N-Channel FET connected in parallel with a series circuit constituted by the secondary winding of said transformer and said first Lus N-Channel FET;   a first driving circuit connected in parallel with a secondary winding of said a transformer for driving first Lus N-Channel FET; and   a second driving circuit connected in parallel with second Lus N-Channel FET for driving second Lus N-Channel FET.   
     
     
         2 . A single-ended forward converter as in  claim 1 , wherein said driving circuit comprises a first and second driving element. 
     
     
         3 . A single-ended forward converter as in  claim 2 , wherein said first driving element comprises the series-connected circuit of the first voltage drop resistor and first zener diode. 
     
     
         4 . A single-ended forward converter as in  claim 3 , wherein said first voltage drop resistor and said first zener diode can be replace first driving resistor and second driving resistor. 
     
     
         5 . A single-ended forward converter as in  claim 2 , wherein said second driving element comprises the series-connected circuit of the second voltage drop resistor and second zener diode. 
     
     
         6 . A single-ended forward converter as in  claim 5 , wherein said second voltage drop resistor and said second zener diode can be replace third driving resistor and fourth driving resistor. 
     
     
         7 . A single-ended forward converter as in  claim 1 , wherein:
 said first terminal of first voltage drop resistor connected to terminal A of secondary winding of said transformer;   said secondary terminal of first voltage drop resistor and said first terminal of first zener diode connected together to said gate of Lus N-Channel FET; and   said second terminal of first zener diode connected to said terminal B of second winding of said transformer.   
     
     
         8 . A single-ended forward converter as in  claim 1 , wherein:
 said first terminal of second voltage drop resistor connected to drain of second Lus N-Channel FET and drain of first Lus N-Channel FET;   said second terminal of second voltage drop resistor and said first terminal of second zener diode connected together to said gate of second Lus N-Channel FET; and   said second terminal of second zener diode connected to terminal A of secondary Winding of said transformer and said source of second Lus N-Channel FET.   
     
     
         9 . A single-ended forward converter comprises:
 a first Lus P-Channel FET connected in series with a secondary winding of a transformer of said single-ended forward converter;   a second Lus P-Channel FET connected in parallel with a series circuit constituted by the secondary winding of said transformer and said first Lus P-Channel FET;   a first driving circuit connected in parallel with a secondary winding of said a transformer for driving first Lus P-Channel FET; and   a second driving circuit connected in parallel with second Lus P-Channel FET for driving second Lus P-Channel FET.   
     
     
         10 . A single-ended forward converter as in  claim 9 , wherein said driving circuit comprises a first and second driving element. 
     
     
         11 . A single-ended forward converter as in  claim 10 , wherein said first driving element comprises the series-connected circuit of the first driving resistor and second driving resistor. 
     
     
         12 . A single-ended forward converter as in  claim 11 , wherein said first driving resistor and second driving resistor can be replace first voltage drop resistor and first zener diode. 
     
     
         13 . A single-ended forward converter as in  claim 10 , wherein said second driving element comprises the series-connected circuit of the third driving resistor and fourth driving resistor. 
     
     
         14 . A single-ended forward converter as in  claim 13 , wherein said third driving resistor and fourth driving resistor can be replace second voltage drop resistor and second zener diode. 
     
     
         15 . A single-ended forward converter as in  claim 9 , wherein:
 said first terminal of first driving resistor connected to terminal A of secondary winding of said transformer;   said second terminal of first driving resistor and said first terminal of second driving resistor connected together to said gate of first Lus P-Channel FET; and   said terminal of second driving resistor connected to terminal B of secondary Winding of said transformer.   
     
     
         16 . A single-ended forward converter as in  claim 9 , wherein:
 said first terminal of third driver resistor connected to drain of first Lus P-Channel FET and drain of second Lus P-Channel FET;   said second terminal of third driving resistor and said first terminal of fourth driving resistor connected together to said gate of second Lus P-Channel FET; and   said second terminal of fourth driving resistor connected to terminal B of secondary winding of said transformer and said source of second Lus P-Channel FET.