GB1498397A - Circuits for supplying electrical current from an alternating voltage source to a load - Google Patents

Circuits for supplying electrical current from an alternating voltage source to a load

Info

Publication number
GB1498397A
GB1498397A GB3856376A GB3856376A GB1498397A GB 1498397 A GB1498397 A GB 1498397A GB 3856376 A GB3856376 A GB 3856376A GB 3856376 A GB3856376 A GB 3856376A GB 1498397 A GB1498397 A GB 1498397A
Authority
GB
United Kingdom
Prior art keywords
voltage
switch
generator
control
load
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.)
Expired
Application number
GB3856376A
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB3856376A priority Critical patent/GB1498397A/en
Publication of GB1498397A publication Critical patent/GB1498397A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/253—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using discharge tubes only

Abstract

1498397 Switching systems for power supplies MULLARD Ltd 17 Sept 1976 38563/76 Heading H2H A circuit for supplying power to a load L comprises a semi-conductor switch T, a generator I 1 for supplying trigger current to the switch and a control circuit for turning the trigger current generator on and off, the control circuit including a comparator COMP for comparing two control voltages Vc, Rr, a detector DET responsive to the voltage across the switch and a gate G1. The control voltage Vc is a variable D.C. reference voltage derived from a potentiometer Rc supplied with a voltage -V from a source 200. A generator 100 supplies the control voltage Vr which is a ramp waveform at twice the frequency of the mains A.C. supply connected to terminals 1, 2. In each half cycle of the mains supply waveform, when the ramp voltage Vr falls below the voltage Vc the comparator turns on the trigger current generator which causes the switch T to conduct. The switch may be a triac or a thyristor and when the voltage across it falls below a predetermined value which is close to zero volts, the detector DET causes the NAND gate G1 to disable the comparator. The trigger current pulse supplied to the switch T is therefore terminated to prevent consumption of energy dua to the unnecessary continuation of the supply of the trigger pulse. The source 200 disables the gate G1 to prevent triggering of the switch T if the voltage -V falls below a predetermined value. The load may be resistive, capacitive or inductive and may be a heating resistor in which case the voltage Vr is a temperature dependent D.C. voltage which is compared with the voltage Vc to provide thermostatic control. By modifying the generator 100 to provide a voltage Vr having a low frequency for example one thousandth that of the A.C. source burst firing control of the switch T may be provided. The transistor circuits constituting the components 100, 200, DET and COMP are described in detail, the ramp generator including a transistor circuit which detects the zero crossing region of the A.C. supply to enable charging of a capacitor for generating the rising portion of the ramp waveform.
GB3856376A 1976-09-17 1976-09-17 Circuits for supplying electrical current from an alternating voltage source to a load Expired GB1498397A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3856376A GB1498397A (en) 1976-09-17 1976-09-17 Circuits for supplying electrical current from an alternating voltage source to a load

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3856376A GB1498397A (en) 1976-09-17 1976-09-17 Circuits for supplying electrical current from an alternating voltage source to a load

Publications (1)

Publication Number Publication Date
GB1498397A true GB1498397A (en) 1978-01-18

Family

ID=10404293

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3856376A Expired GB1498397A (en) 1976-09-17 1976-09-17 Circuits for supplying electrical current from an alternating voltage source to a load

Country Status (1)

Country Link
GB (1) GB1498397A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3114433A1 (en) * 1981-04-09 1982-11-11 Siemens AG, 1000 Berlin und 8000 München Integrable semiconductor circuit for driving triacs
WO2005064794A1 (en) * 2003-12-30 2005-07-14 Empresa Brasileira De Compressores S.A.-Embraco A system and a method of controlling the triggering of a triac
EP2887525A1 (en) * 2013-12-19 2015-06-24 Electrolux Appliances Aktiebolag System for monitoring electric loads and for monitoring driving apparatuses of said electric loads

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3114433A1 (en) * 1981-04-09 1982-11-11 Siemens AG, 1000 Berlin und 8000 München Integrable semiconductor circuit for driving triacs
WO2005064794A1 (en) * 2003-12-30 2005-07-14 Empresa Brasileira De Compressores S.A.-Embraco A system and a method of controlling the triggering of a triac
US7751992B2 (en) 2003-12-30 2010-07-06 Empresa Brasileira De Compressores S.A. - Embraco System of controlling and triggering a TRIAC and a method of controlling the triggering of a TRIAC
AU2004309854B2 (en) * 2003-12-30 2010-07-15 Whirlpool S.A. A system and a method of controlling the triggering of a TRIAC
CN1951011B (en) * 2003-12-30 2010-09-08 巴西压缩机股份有限公司 A system and a method of controlling the triggering of a triac
KR101120187B1 (en) * 2003-12-30 2012-03-19 월풀 에쎄.아. A system and a method of controlling the triggering of a triac
EP2887525A1 (en) * 2013-12-19 2015-06-24 Electrolux Appliances Aktiebolag System for monitoring electric loads and for monitoring driving apparatuses of said electric loads
WO2015090872A1 (en) * 2013-12-19 2015-06-25 Electrolux Appliances Aktiebolag System for monitoring electric loads and for monitoring driving apparatuses of said electric loads
US10501882B2 (en) 2013-12-19 2019-12-10 Electrolux Appliances Aktiebolag System for monitoring electric loads and for monitoring driving apparatuses of said electric loads

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Legal Events

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