Apparatus and circuit for power supply, and apparatus for controlling large current load

Abstract

A GaN-FET ( 10 ) having a small resistance at the time of conduction is disposed in the path of a main current that flows between an input terminal ( 11 ) and an output terminal ( 12 ). Moreover, there are provided a Zener diode (ZD) and a resistor (R) for setting an output voltage (Vout). As a result, reduction of size and weight is realized, and design including radiation design can be conducted flexibly. Time and labor required for design are remarkably reduced.

1 . A power supply apparatus comprising: 
 a semiconductor element, disposed in the path of a main current that is a subject of power control, and formed by using a GaN compound; and    a control unit which controls conduction of the main current flowing through said semiconductor element.    
   
   
       2 . The power supply apparatus according to  claim 1 , wherein said semiconductor element is provided in plurality, and said semiconductor elements are connected in parallel.  
   
   
       3 . The power supply apparatus according to  claim 2 , wherein said semiconductor elements are arranged so as to be adjacent to each other.  
   
   
       4 . The power supply apparatus according to  claim 1 , wherein said semiconductor element is a GaN-FET.  
   
   
       5 . A power supply apparatus comprising: 
 a semiconductor element, disposed in the path of a main current that is a subject of power control, and formed by using a GaN compound; and    a control unit which conducts switching control on conduction of the main current flowing through said semiconductor element.    
   
   
       6 . The power supply apparatus according to  claim 5 , wherein said semiconductor element is provided in plurality, and said semiconductor elements are connected in parallel.  
   
   
       7 . The power supply apparatus according to  claim 6 , wherein said semiconductor elements are arranged so as to be adjacent to each other.  
   
   
       8 . The power supply apparatus according to  claim 5 , wherein said semiconductor element is a GaN-FET.  
   
   
       9 . A power supply circuit having a transformer, and which conducts on/off control on voltage applied to a primary winding of said transformer, and thereby supplies a stabilized power supply voltage to a secondary winding side of said transformer, further comprising: 
 a GaN-FET connected to the primary winding of said transformer and on/off-controlled by a gate signal.    
   
   
       10 . A large current load current load control apparatus that conducts on/off control on a current supplied from a power source according to a predetermined instruction and supplies a resultant current to an electric load, said large current load current load control apparatus comprising: 
 a GaN-FET, connected to a power source line that connects said source to said load, and which conducts the on/off control.