Method, circuit and apparatus for supplying an electrical curren

Details Method, circuit and apparatus for supplying an electrical curren Method, circuit and apparatus for supplying an electrical curren

1991-01-08

1992-08-11

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219494, 219501, 219535, 307 75, 307 43, H05B 102

Patent

active

051381362

ABSTRACT:
The invention relates to a system for processing an electrical power supply signal for a resistive heating element.
The circuit provided comprises an a.c. current source, a rectifier and a chopper for supplying the resistive element with a current having two superimposed components one being d.c. and the other being a.c., both at a variable voltage.
The invention applies particularly to the supplying, with a signal thus processed, of the resistive element of a connecting piece for electro-weldable plastic tubes, of an electro-heating envelope for the connection or protection of pipes, or of a heat-shrink sheath for operation on a cable having a conductor or conductors used for the carrying of electrical energy or for telecommunications.

REFERENCES:
patent: 3593197 (1971-07-01), Carreras
patent: 4105437 (1978-08-01), Liu
patent: 4475028 (1984-10-01), McGuire, Jr. et al.
patent: 4602193 (1986-07-01), Patonay et al.

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