Controlled switching circuit for d. c. supply for inductive or regenerative loads

Claim 1

AN ELECTRIC CIRCUIT ARRANGEMENT FOR CONTROLLING THE FLOW OF CURRENT BETWEEN A DIRECT CURRENT SUPPLY SOURCE AND AN INDUCTIVE DIRECT CURRENT LOAD CIRCUIT, THE ARRANGEMENT COMPRISING IN COMBINATION A SWITCHING CIRCUIT HAVING POSITIVE AND NEGATIVE TERMINALS FOR CONNECTION TO THE SUPPLY SOURCE AND INCLUDING IN SERIES BETWEEN THE TERMINALS, FIRST AND SECOND CONTROLLABLE ELECTRONIC SWITCHING DEVICES AND A TAPPED LINEAR INDUCTOR, THE INDUCTOR BEING CONNECTED BETWEEN THE SWITCHING DEVICES AND THE SWITCHING DEVICES BEING CONNECTED SO AS TO ENABLE CURRENT TO FLOW TOWARDS THE NEGATIVE TERMINAL, A CAPACITOR CIRCUIT CONNECTED IN PARALLEL WITH THE SWITCHING CIRCUIT FOR PREVENTING THE POTENTIAL OF THE TAPPING CHANGING AT A RATE GREATER THAN A PREDETERMINED VALUE AND INCLUDING IN SERIES TWO CAPACITORS CONNECTED TOGETHER BY A COMMON CONNECTION, A DIODE CIRCUIT CONNECTED IN PARALLEL WITH THE SWITCHING CIRCUIT AND INCLUDING IN SERIES TWO DIODES CONNECTED TOGETHER BY A COMMON CONNECTION AND IN A MANNER SO AS TO ENABLE CURRENT TO FLOW TOWARDS THE POSITIVE TERMINAL, MEANS FOR ELECTRICALLY CONNECTING TOGETHER THE TAPPING OF THE INDUCTOR AND THE SAID COMMON CONNECTIONS CONNECTING THE DIODES AND THE CAPACITORS, OUTPUT CIRCUIT CONNECTIONS FOR ENABLING THE LOAD CIRCUIT TO BE CONNECTED BETWEEN THE TAPPING OF THE INDUCTOR AND ONE OF THE TERMINALS OF THE SWITCHING CIRCUIT, AND CONTROL MEANS FOR RENDERING THE SWITCHING DEVICES REPEATEDLY AND ALTERNATELY CONDUCTIVE AT INSTANTS IN EACH CYCLE OF OPERATION WHICH ARE DEPENDENT ON A CONTROL SIGNAL TO BE SUPPLIED TO THE CONTROL MEANS WHEREBY TO CONTROL THE SAID FLOW OF DIRECT CURRENT BETWEEN THE SUPPLY SOURCE AND THE LOAD CIRCUIT.