GB2002983A - Threshold circuits for alternating signals - Google Patents

Threshold circuits for alternating signals

Info

Publication number
GB2002983A
GB2002983A GB7833316A GB7833316A GB2002983A GB 2002983 A GB2002983 A GB 2002983A GB 7833316 A GB7833316 A GB 7833316A GB 7833316 A GB7833316 A GB 7833316A GB 2002983 A GB2002983 A GB 2002983A
Authority
GB
United Kingdom
Prior art keywords
comparator
delay
circuit
input
signal
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
GB7833316A
Other versions
GB2002983B (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.)
Danfoss AS
Original Assignee
Danfoss AS
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 Danfoss AS filed Critical Danfoss AS
Publication of GB2002983A publication Critical patent/GB2002983A/en
Application granted granted Critical
Publication of GB2002983B publication Critical patent/GB2002983B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • G01R19/1658—AC voltage or recurrent signals

Abstract

In monitoring an alternating signal it is known to rectify and smooth the signal and apply it to one input of a comparator which has a direct reference potential applied to its other input. Good smoothing is necessary to avoid a continuous change in the comparator output so that the comparator shall act as a threshold circuit but this unfortunately results in a correspondingly large time delay in response. In the present invention, a comparator circuit IC1 is arranged to respond to instantaneous changes in the waveform of the alternating signal IM and has its output connected to a bistable circuit IC2 which has a substantially instantaneous switching characteristic in one direction but has a delay characteristic in the opposite direction. A principal use of the invention lies in the automatic control of a refrigeration compressor driven by an alternating current motor. Feedback via R4 provides hysteresis by reducing the threshold voltage VE when two consecutive pulses exceed the original threshold level, R6, C2 providing the delay. <IMAGE>
GB7833316A 1977-08-16 1978-08-15 Threshold circuits for alternating signals Expired GB2002983B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2736783A DE2736783C3 (en) 1977-08-16 1977-08-16 Limit value reporting device for alternating signals

Publications (2)

Publication Number Publication Date
GB2002983A true GB2002983A (en) 1979-02-28
GB2002983B GB2002983B (en) 1982-01-20

Family

ID=6016450

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7833316A Expired GB2002983B (en) 1977-08-16 1978-08-15 Threshold circuits for alternating signals

Country Status (6)

Country Link
JP (1) JPS5432366A (en)
DE (1) DE2736783C3 (en)
DK (1) DK159336C (en)
GB (1) GB2002983B (en)
NL (1) NL185539C (en)
SE (1) SE431915B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2486207A1 (en) * 1980-07-07 1982-01-08 Dunham Bush Inc Air source heat pump system for heating buildings - has refrigerant charged bulb within air flow passing over outdoor coil for sensing ambient temp.
EP0078149A1 (en) * 1981-10-23 1983-05-04 Dresser Industries,Inc. Oil-flooded compressor with condensation control system
FR2735623A1 (en) * 1995-06-16 1996-12-20 Tricard Jean Pierre Electronic protection device for domestic refrigerators and freezers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3139598A1 (en) * 1981-10-06 1983-06-16 AEG-Telefunken Nachrichtentechnik GmbH, 7150 Backnang Circuit arrangement for recording telecommunications traffic
CN102033197B (en) * 2010-10-18 2014-04-23 中国电力科学研究院 Direct current (DC) converter valve non-periodic triggering test method using improved time delay method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011569B1 (en) * 1969-01-27 1975-05-02

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2486207A1 (en) * 1980-07-07 1982-01-08 Dunham Bush Inc Air source heat pump system for heating buildings - has refrigerant charged bulb within air flow passing over outdoor coil for sensing ambient temp.
EP0078149A1 (en) * 1981-10-23 1983-05-04 Dresser Industries,Inc. Oil-flooded compressor with condensation control system
FR2735623A1 (en) * 1995-06-16 1996-12-20 Tricard Jean Pierre Electronic protection device for domestic refrigerators and freezers

Also Published As

Publication number Publication date
DE2736783C3 (en) 1980-05-08
JPS5432366A (en) 1979-03-09
SE431915B (en) 1984-03-05
DE2736783A1 (en) 1979-02-22
DK159336B (en) 1990-10-01
DE2736783B2 (en) 1979-08-30
NL185539C (en) 1990-05-01
GB2002983B (en) 1982-01-20
NL7807981A (en) 1979-02-20
SE7808647L (en) 1979-02-17
NL185539B (en) 1989-12-01
DK159336C (en) 1991-03-11
DK357578A (en) 1979-02-17

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Legal Events

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

Effective date: 19920815