Method of producing a ptc-resistor device
AssigneeABB Research Ltd.
InventorsRalf Strumpler, Ruzica Loitzl-Jelenic, Joachim Glatz-Reichenbach
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Abstract
The invention relates to a novel method of producing a resistor device comprising a PTC-polymer element 2 and a varistor element 4. Both elements are moulded in a common moulding process using one common mould. Preferred is co-injection moulding. The invention further relates to the resistor device thus produced and a current limit means including the resistor device and a switch (FIG. 4).
Claims14
A method of producing a resistor device, said resistor device comprising
- a PTC-polymer element (2) and
- a varistor element (4),
- said PTC-polymer element (2) and said varistor element (4) being, at least in part, electrically parallel to each other,
- said method being characterised in that,
- said PTC-polymer element (2) and said varistor element (4) are fabricated by moulding PTC-polymer material (2) and varistor polymer material (4) during one common moulding process into one common mould (1).
A method according to one of the preceding claims, wherein said moulding process is a co-injection moulding process.
A method according to one of the preceding claims, wherein metal contact elements (5) are inserted into said PTC-polymer material (2) during said moulding process.
A method according to one of the preceding claims, wherein said PTC-polymer element (2) includes a constriction (6) of the effective current carrying area perpendicular to a main current direction of said resistor device.
A method according to one of the preceding claims, wherein said resistor device, after fabrication, comprises metal contacts (5) being in contact exclusively with said PTC-polymer material (2), not with said varistor polymer material (4).
A resistor device produced by a method according to one of the preceding claims.
Dependencies are inferred from the claim text.