Radio frequency pulse generator using dc charging

Claim 2

A radiofrequency generator comprising: a source of direct current energy producing a first predetermined voltage level; charging means; charging switch means connected between said source of direct current energy and said charging means and being operable to couple said source of direct current Energy to said charging means during a first predetermined time; a load; a radiofrequency tank circuit connected between said charging means and said source of direct current energy and connected in series with said load, said radiofrequency tank circuit including a storage means cooperating with said charging means to develop a second predetermined voltage level of greater magnitude than the first predetermined voltage level of said source of direct current energy; and power switch means connected in parallel with the seriesconnected radiofrequency tank circuit and load and being operative during a second predetermined time to discharge said storage means through said load.

Claim 3

A radiofrequency generator according to claim 1 wherein: said charging means includes a charging inductor; and said charging switch means includes a first transformer having primary and secondary windings and being operative to couple a trigger signal from said primary winding to said secondary winding; and a controlled rectifier having its gate electrode connected to the secondary winding of said first transformer and having its anode and cathode connected between said source of direct current energy and said charging means, said controlled rectifier being operative in response to a trigger signal at its gate electrode to provide a low impedance path between said direct current energy source and said charging means.

Claim 4

A radiofrequency generator according to claim 1 wherein: said charging means includes a plurality of inductors having one end of each connected together at a common connection; and said radiofrequency tank circuit includes an inductance element of predetermined value; and a plurality of capacitors of predetermined value, each having one end connected to the other end of a separate one of the inductors of said charging means to thereby form a plurality of resonant charging circuits with said charging means, and the other end connected to said inductive element to thereby form a radiofrequency tank circuit therewith.

Claim 5

A radiofrequency generator according to claim 3 wherein said power switch means includes: a second transformer adapted to couple a trigger pulse received across its primary winding to its secondary winding; and a plurality of rows of bipolar switches, each row connected between the common connection of the inductors of said charging means and the capacitors of said radiofrequency tank circuit and said load, each of said bipolar switches comprising a diode; and a controlled rectifier having its gate electrode connected to the secondary winding of said second transformer and having its anode and cathode connected in an opposite polarity arrangement with said diode, said controlled rectifier being operative in response to a signal at its gate electrode to substantially reduce the impedance between its anode and cathode electrodes whereby said tank circuit oscillates causing current to flow through said controlled rectifier during one half-cycle and through said diode during the alternate half-cycle.

Claim 6

A radiofrequency generator according to claim 4 wherein said charging switch means includes: a first transformer having primary and secondary windings and being operative to couple a trigger signal from said primary winding to said secondary winding; and a controlled rectifier having its gate electrode connected to the secondary winding of said first transformer and having its anode and cathode connected between said source of direct current energy and said charging means, said controlled rectifier being operative in response to a trigger signal at its gate electrode to provide a low impedance path between said direct current energy source and said charging means.