Matching apparatus for connecting high frequency solid state electrical power generator to a load
AssigneeThermatool Corp.
InventorsPaul Scott, Michael Turzhitsky, Thomas Lee, Wallace C. Rudd
Life of this patent
Estimating the term…
Abstract
High frequency electrical heating apparatus in which metal parts are heated as they are advanced,either for annealing or forge welding purposes,and in which the electrical heating current is supplied by solid state D.C. to A.C. inverter through a load matching and frequency control circuit which maintains the desired load current and current frequency with changes in the load impedance caused by the metal parts as they are advanced.
Claims37
A high frequency electrical heating system for the heating of a portion or portions of a metal part of parts to a temperature of at least 1300.degree. F. but below the melting temperature of the metal as the portions are advanced, said system comprising:
- a solid state electrical inverter having an output for providing high frequency electrical power, the magnitude and frequency of which is dependent upon the impedance of a load connected thereto, said load comprising means for causing electrical heating current to flow in said portion or portions while advancing said part or parts;
- and
- load matching and frequency control means connected to said output of said inverter and to said means for causing heating current to flow in said portions, said load matching and frequency control means comprising:
- a first variable reactor electrically connected in series between said output and said load and a second variable reactor electrically connected in parallel with said output, each said first reactor and said second reactor producing energy fields when electrically energized, said field, and hence, the reactor, being variable in reactance, by energy field varying means adjacent thereto and movable with respect thereto;
- and
- a capacitor having an electrical connection to said output which is the same as the electrical connection of one said first reactor and said second reactor to said output.
A high frequency forge welding system for the heating of a pair of adjacent portions of a metal part or parts to forge welding temperature as the portions are advanced to a weld point and are pressed together at said weld point, said system comprising:
- a solid state electrical inverter having an output for providing high frequency electrical power, the magnitude and frequency of which is dependent upon the impedance of a load connected thereto, said load comprising means for causing electrical heating current to flow in said portion or portions while advancing said part or parts;
- and
- load matching and frequency control means connected to said output of said inverter and to said means for causing heating current to flow in said portions, said load matching and frequency control means comprising:
- a first variable reactor electrically connected in series between said output and said load and a second variable reactor electrically connected in parallel with said output, each said first reactor and said second reactor producing energy fields when electrically energized, said field and hence, the reactors being variable in reactance by energy field varying means adjacent thereto and movable with respect thereto;
- and
- a capacitor having electrical connection to said output which is the same as the electrical connection of one of said first reactor and said second reactor to said output.
Dependencies are inferred from the claim text.