CA2023286A1 - Temperature-compensated thermal protector - Google Patents

Temperature-compensated thermal protector

Info

Publication number
CA2023286A1
CA2023286A1 CA 2023286 CA2023286A CA2023286A1 CA 2023286 A1 CA2023286 A1 CA 2023286A1 CA 2023286 CA2023286 CA 2023286 CA 2023286 A CA2023286 A CA 2023286A CA 2023286 A1 CA2023286 A1 CA 2023286A1
Authority
CA
Canada
Prior art keywords
ptc device
temperature
protective
heater
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2023286
Other languages
French (fr)
Other versions
CA2023286C (en
Inventor
James A. Tennant
Charles Yagher Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Emerson Electric Co
Original Assignee
Therm O Disc Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/394,480 external-priority patent/US5153805A/en
Application filed by Therm O Disc Inc filed Critical Therm O Disc Inc
Publication of CA2023286A1 publication Critical patent/CA2023286A1/en
Application granted granted Critical
Publication of CA2023286C publication Critical patent/CA2023286C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

TEMPERATURE-COMPENSATED THERMAL PROTECTOR
ABSTRACT OF THE DISCLOSURE

A protective PTC device is heated by a heater PTC device or by a resistor to an elevated temperature greater than ambient but less than its switching temperature. The elevated temperature of the protective PTC device reduces its switching response time, and minimizes variations in such response time with variations in ambient temperature. The protective PTC
device is connected in series with an electrical load to reduce current to a load when the protective PTC device is switched to its high-resistance state by a temperature increase resulting from overcurrent. The heater PTC device or the heater resistor may be in parallel or in series with the protective PTC device.
The heater PTC device does not carry load current, but the heater resistor may be placed in series with the load and the protective PTC device so as to carry load current along with the protective PTC device.
CA 2023286 1989-08-16 1990-08-15 Temperature-compensated thermal protector Expired - Fee Related CA2023286C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US394,480 1989-08-16
US07/394,480 US5153805A (en) 1988-06-06 1989-08-16 Temperature-compensated thermal protector

Publications (2)

Publication Number Publication Date
CA2023286A1 true CA2023286A1 (en) 1991-02-17
CA2023286C CA2023286C (en) 1995-02-07

Family

ID=23559126

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2023286 Expired - Fee Related CA2023286C (en) 1989-08-16 1990-08-15 Temperature-compensated thermal protector

Country Status (1)

Country Link
CA (1) CA2023286C (en)

Also Published As

Publication number Publication date
CA2023286C (en) 1995-02-07

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Legal Events

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