GB2011195A - Controlling the supply of a.c. to a load - Google Patents

Controlling the supply of a.c. to a load

Info

Publication number
GB2011195A
GB2011195A GB79979A GB7900979A GB2011195A GB 2011195 A GB2011195 A GB 2011195A GB 79979 A GB79979 A GB 79979A GB 7900979 A GB7900979 A GB 7900979A GB 2011195 A GB2011195 A GB 2011195A
Authority
GB
United Kingdom
Prior art keywords
load
pulses
supply
triac
circuit
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
GB79979A
Other versions
GB2011195B (en
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.)
MIDLAND BINDING MACHINES Ltd
Original Assignee
MIDLAND BINDING MACHINES Ltd
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
Application filed by MIDLAND BINDING MACHINES Ltd filed Critical MIDLAND BINDING MACHINES Ltd
Priority to GB79979A priority Critical patent/GB2011195B/en
Publication of GB2011195A publication Critical patent/GB2011195A/en
Application granted granted Critical
Publication of GB2011195B publication Critical patent/GB2011195B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

A circuit for controlling the supply of a.c. to a load RL comprises a triac TR1, the conduction angle of which is controlled by pulses from a pulse generator 4. The circuit includes a low voltage power supply 1 and a timer 2 which is adjustable to set the overall time period between 0-4 minutes during which the load is energised. A delay circuit 3 produces pulses at each zero crossing of the supply, the width of the pulses being determined by the resistance of a P.T.C. thermistor TH1 associated with the load. The trailing edges of the pulses trigger the pulse generator which in turn supplies trigger pulses to the triac TR1 so that the triac is switched on early in each half cycle when the load is cold and late in each half cycle when the load is hot. The load may be a heating element which melts adhesive in a book binding machine or the circuit may be used to dim a lamp. <IMAGE>
GB79979A 1977-10-11 1979-01-11 Thermal binding machines Expired GB2011195B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB79979A GB2011195B (en) 1977-10-11 1979-01-11 Thermal binding machines

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4221577 1977-10-11
GB79979A GB2011195B (en) 1977-10-11 1979-01-11 Thermal binding machines

Publications (2)

Publication Number Publication Date
GB2011195A true GB2011195A (en) 1979-07-04
GB2011195B GB2011195B (en) 1982-08-04

Family

ID=26264856

Family Applications (1)

Application Number Title Priority Date Filing Date
GB79979A Expired GB2011195B (en) 1977-10-11 1979-01-11 Thermal binding machines

Country Status (1)

Country Link
GB (1) GB2011195B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033822A1 (en) * 1979-10-29 1981-08-19 Arne Kullberg A process and a device for hot working
GB2134730A (en) * 1983-02-02 1984-08-15 Kannegiesser Martin Heating device for appliances for gluing sheet-like textile articles
GB2301716A (en) * 1995-06-01 1996-12-11 Yang Tai Her Phase angle control circuit for a switching device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033822A1 (en) * 1979-10-29 1981-08-19 Arne Kullberg A process and a device for hot working
GB2134730A (en) * 1983-02-02 1984-08-15 Kannegiesser Martin Heating device for appliances for gluing sheet-like textile articles
GB2301716A (en) * 1995-06-01 1996-12-11 Yang Tai Her Phase angle control circuit for a switching device

Also Published As

Publication number Publication date
GB2011195B (en) 1982-08-04

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19980111