Elongate electrical assemblies
AssigneeRaychem Corporation
InventorsJohn A. Midgley, Richard H. Hulett
Life of this patent
Estimating the term…
Abstract
Elongate electrical devices, comprising two conductors with electrical elements connected in parallel between them, have improved performance if the power supply is connected to one conductor at the near end and to the other conductor at the far end. Particularly useful devices are heaters, e.g. PTC conductive polymer heaters. The power supply is connected to the far end of the device through a connection means whose electrical properties can be correlated with those of the device in order to obtain a wide range of useful results. For example the connection means can have PTC, NTC or ZTC character and can be a simple conductor or another elongate device. The power supply can be DC or single-phase, two-phase or three-phase AC.
Claims14
An electrical circuit which comprises
- (1) a three phase power source;
- (2) a first elongate electrical heater which comprises
- (a) a first elongate electrical connection means having a near end and a far end;
- (b) a second elongate electrical connection means having a near end and a far end;
- and
- (c) a plurality of electrical heating elements which are connected in parallel with each other between the first and second electrical connection means;
- (3) a second elongate electrical heater which comprises
- (a) a first elongate electrical connection means having a near end and a far end;
- (b) a second elongate electrical connection means having a near end and a far end;
- and
- (c) a plurality of electrical elements which are connected in parallel with each other between the first and second electrical connection means;
- and
- (4) a third elongate electrical heater which comprises
- (a) a first elongate electrical connection means having a near end and a far end;
- (b) a second elongate electrical connection means having a near end and a far end;
- and
- (c) a plurality of electrical elements which are connected in parallel with each other between the first and second electrical connection means;
- one end of one of the connection means of each of the first, second and third heaters being connected to the first, second or third phase of the power source, and the other ends of the other connection means of each of the heaters being connected to a different phase or to each other.
Dependencies are inferred from the claim text.