GB1395889A – Ac power control unit
– Google Patents
GB1395889A – Ac power control unit
– Google Patents
Ac power control unit
Info
Publication number
GB1395889A
GB1395889A
GB5613071A
GB5613071A
GB1395889A
GB 1395889 A
GB1395889 A
GB 1395889A
GB 5613071 A
GB5613071 A
GB 5613071A
GB 5613071 A
GB5613071 A
GB 5613071A
GB 1395889 A
GB1395889 A
GB 1395889A
Authority
GB
United Kingdom
Prior art keywords
control
signal
load
square wave
generator
Prior art date
1971-12-03
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
GB5613071A
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.)
Howden Supertherm Ltd
Original Assignee
Howden Supertherm 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.)
1971-12-03
Filing date
1971-12-03
Publication date
1975-05-29
1971-12-03
Application filed by Howden Supertherm Ltd
filed
Critical
Howden Supertherm Ltd
1971-12-03
Priority to GB5613071A
priority
Critical
patent/GB1395889A/en
1972-12-04
Priority to FR7243050A
priority
patent/FR2165915A1/fr
1972-12-04
Priority to JP12144572A
priority
patent/JPS5710452B2/ja
1972-12-04
Priority to US00312214A
priority
patent/US3806784A/en
1975-05-29
Publication of GB1395889A
publication
Critical
patent/GB1395889A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G05—CONTROLLING; REGULATING
G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
G05F1/10—Regulating voltage or current
G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
G05F1/45—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load
G05F1/452—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load with pulse-burst modulation control
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
G05D23/1913—Control of temperature characterised by the use of electric means using an analogue comparing device delivering a series of pulses
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
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
H02M1/00—Details of apparatus for conversion
H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
H02P27/02—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using supply voltage with constant frequency and variable amplitude
H02P27/026—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using supply voltage with constant frequency and variable amplitude whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
Abstract
1395889 Automatic control systems HOWDEN SUPERTHERM Ltd 7 June 1972 [3 Dec 1971] 56130/71 Heading G3R A control system includes a semi-conductor switch 5 whose on/off period is altered to control the power supplied to a load C wherein a control signal which is the sum of a reference signal and the error signal produced from the comparison of an actual value with the reference value is used to produce from a staircase waveform a square wave, whose mark to space ratio corresponds to the value of the control signal, which square wave controls the application of firing pulses to the semi-conductor switch. The staircase generator 3 produces a waveform having a selectable number of steps (from 2 to 15) and is synchronized with the mains supply by oscillator 1 and shaper 2. The control input (control signal) is used in generator 4 to produce the variable mark/space ratio square wave which is used to enable the firing pulse generator 6 for the period of the cycle of the staircase waveform when power is to be supplied to the load. In the embodiment shown the load C is a heater and sensor 8 produces a signal representative of the actual temperature which signal is fed, along with the reference signal, to a difference amplifier 7. The control system can also be used for the control of a three phase heating system or single, or three phase motors. In a motor application it is stated that the speed of the motor may be sensed or, if it drives a fan the air-flow from the fan may be sensed.
GB5613071A
1971-12-03
1971-12-03
Ac power control unit
Expired
GB1395889A
(en)
Priority Applications (4)
Application Number
Priority Date
Filing Date
Title
GB5613071A
GB1395889A
(en)
1971-12-03
1971-12-03
Ac power control unit
FR7243050A
FR2165915A1
(en)
1971-12-03
1972-12-04
JP12144572A
JPS5710452B2
(en)
1971-12-03
1972-12-04
US00312214A
US3806784A
(en)
1971-12-03
1972-12-04
A.c. power control unit
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB5613071A
GB1395889A
(en)
1971-12-03
1971-12-03
Ac power control unit
Publications (1)
Publication Number
Publication Date
GB1395889A
true
GB1395889A
(en)
1975-05-29
Family
ID=10475808
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5613071A
Expired
GB1395889A
(en)
1971-12-03
1971-12-03
Ac power control unit
Country Status (4)
Country
Link
US
(1)
US3806784A
(en)
JP
(1)
JPS5710452B2
(en)
FR
(1)
FR2165915A1
(en)
GB
(1)
GB1395889A
(en)
Families Citing this family (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4400613A
(en)
*
1978-12-04
1983-08-23
General Electric Company
Temperature controller for a fusing roller
DE2855331C2
(en)
*
1978-12-21
1985-04-25
Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt
Circuit arrangement for controlling or regulating several consumers using the vibration packet control method
DE2855332A1
(en)
*
1978-12-21
1980-06-26
Licentia Patnetent Verwaltungs
SETTING UP A VIBRATION PACKAGE CONTROL WITH CONTROL BY A STATIC AC ACTUATOR
IT1135172B
(en)
*
1981-01-26
1986-08-20
Roy Electrotex Spa
ELECTRIC DEVICE FOR DRIVING WIRE FEEDING EQUIPMENT FOR TEXTILE MACHINES
FR2520949A1
(en)
*
1982-01-29
1983-08-05
Int Home Systems
DEVICE FOR POWER SUPPLY WITH ELECTRIC CHARGE
JPS58118243U
(en)
*
1982-02-05
1983-08-12
愛知機械工業株式会社
Heat shield plate in carburetor for internal combustion engine
ITUB20154187A1
(en)
2015-10-06
2016-01-06
Fameccanica Data Spa
PROCEDURE AND EQUIPMENT FOR THE PRODUCTION OF AN ABSORBENT STRUCTURE
Family Cites Families (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3377547A
(en)
*
1965-03-12
1968-04-09
Barber Colman Co
Automatic ac power control system with reset windup prevention
US3611086A
(en)
*
1970-01-14
1971-10-05
Reliance Electric Co
Integral carrier ratio inverter
US3703672A
(en)
*
1970-05-05
1972-11-21
Nat Res Dev
Three-phase induction-motor, speed-changing method and control circuit
US3662247A
(en)
*
1970-10-01
1972-05-09
Reliance Electric Co
Pulse width modulated inverter adaptive logic
US3694718A
(en)
*
1970-10-19
1972-09-26
Gen Electric
Methods of inverter voltage control by superimposed chopping
1971
1971-12-03
GB
GB5613071A
patent/GB1395889A/en
not_active
Expired
1972
1972-12-04
FR
FR7243050A
patent/FR2165915A1/fr
not_active
Withdrawn
1972-12-04
US
US00312214A
patent/US3806784A/en
not_active
Expired – Lifetime
1972-12-04
JP
JP12144572A
patent/JPS5710452B2/ja
not_active
Expired
Also Published As
Publication number
Publication date
JPS4876047A
(en)
1973-10-13
JPS5710452B2
(en)
1982-02-26
US3806784A
(en)
1974-04-23
FR2165915A1
(en)
1973-08-10
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Legal Events
Date
Code
Title
Description
1975-10-08
PS
Patent sealed [section 19, patents act 1949]
1976-06-30
435
Patent endorsed ‘licences of right’ on the date specified (sect. 35/1949)
1978-01-05
PLNP
Patent lapsed through nonpayment of renewal fees
