Method, circuit and apparatus for supplying an electrical current to a resistive heating element
US5138136A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jan 8, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/73715
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.