Energy recoverable choke feed

Abstract

An improved choke feed is provided for minimizing the inductive fly-back tage phenomenon at the inputs of voltage chopper circuits. By using directional shunts, fly-back energy is recovered and passed through to the chopper circuit for improved efficiency.

I claim: 
     
       1. An energy recoverable choke feed for a converter power supply having a voltage source and a voltage chopper circuit means for converting direct current voltage to alternating current voltage, comprising: an input terminal connected to said voltage source;   first and second inductive branches, each having an input and an output, where said inputs of both of said inductive branches are connected to said input terminal;   first directional shunt means for passing current in a fixed direction connected between said outputs of said inductive branches;   second directional shunt means for passing current in a direction opposite to said first directional shunt means connected between said outputs of said inductive branches;   a first output terminal connected to said output of said first inductive branch; and   a second output terminal connected to said output of said second inductive branch, said first and second output terminals being connected to the first and second inputs, respectively, of said voltage chopper circuit means.   
     
     
       2. An energy recoverable choke feed circuit as set forth in claim 1 where said first and second inductive branches comprise inductive chokes. 
     
     
       3. An energy recoverable choke feed circuit as set forth in claim 2 above where said first and second directional shunt means comprise voltage clamping means. 
     
     
       4. An energy recoverable choke feed circuit as set forth in claim 3 above where said first and second shunt means further comprise current limiting means. 
     
     
       5. An energy recoverable choke feed circuit as set forth in claim 4 where said voltage clamping means comprises a capacitor. 
     
     
       6. An energy recoverable choke feed circuit as set forth in claim 5 above where said current limiting means comprises an inductor.