EP3088985A1 - Connexion d'une source transformateur avec une gamme d'entrée étendue - Google Patents

Connexion d'une source transformateur avec une gamme d'entrée étendue Download PDF

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Publication number
EP3088985A1
EP3088985A1 EP15199276.5A EP15199276A EP3088985A1 EP 3088985 A1 EP3088985 A1 EP 3088985A1 EP 15199276 A EP15199276 A EP 15199276A EP 3088985 A1 EP3088985 A1 EP 3088985A1
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EP
European Patent Office
Prior art keywords
voltage
transformer
switches
input
connection
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.)
Withdrawn
Application number
EP15199276.5A
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German (de)
English (en)
Inventor
Vaclav JIROVSKY
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.)
Czech Technical University In Prague
Original Assignee
Czech Technical University In Prague
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Filing date
Publication date
Application filed by Czech Technical University In Prague filed Critical Czech Technical University In Prague
Publication of EP3088985A1 publication Critical patent/EP3088985A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices

Definitions

  • the invention deals with a connection of transformer power source with input voltage ranging within two limit values, which are rather distant from each other.
  • the connection allows to transform alternating voltage within wide range of input voltages where the primary voltage value is determined even before it is connected to the primary winding of the transformer, thus eliminating possible overloading of the primary winding and current surges.
  • a transformer For transformation of two different voltages with values rather distant from each other a transformer is usually equipped with multiple taps, which are switched from one to another by a servomotor.
  • the servomotor must always start from the tap with the highest transformation ratio and proceed towards the tap with the lowest transformation ratio because otherwise the high voltage connected to the tap with low transformation ratio would cause a current surge and could result in the transformer damage.
  • Another solution applies an array of relays, which suitably combine the taps on the primary winding so that they always proceed from the highest possible primary voltage to the lowest while monitoring whether the output voltage corresponds to required voltage. In many cases though only two different voltages are switched between, which however require very different transformation ratios of the transformer winding. Methods mentioned above mostly lead to costly and complex connection and high investments even in cases where the range of the input voltages is clearly defined but it is not clearly given when connecting to the distribution network.
  • transformer power source with wide input range according to the presented solution. Its principle is that it consists of the voltage converter where its output is connected to the input of the processor and further it consists of the auxiliary power supply source of direct voltage with wide range of input voltages where this range corresponds to the required parameters for the transformer power supply source and where its output is connected to the power supply input of the processor. Outputs of the processor are connected to control inputs of at least two switches. Inputs of the auxiliary source of direct voltage, voltage converter and the first switching contacts of switches are connected to the input voltage terminal. The second switching contacts of switches are connected to the transformer primary winding tap relevant for them. The output of the connection is the output terminals of the secondary winding. Switches may implement electromechanical relays or semiconductor switches with relevant parameters.
  • connection presented herein removes the disadvantages of currently known solutions since it uses a circuit for evaluation of the incoming voltage by means of connection of a voltage converter and a processor, which resets when one of the limit voltages turns off and then the other limit voltage turns on, and subsequently it finds out from the output of the voltage converter what voltage is being brought to the power supply source input and accordingly it switches the relevant switch, thus selecting the corresponding primary winding of the transformer. Anytime a voltage is brought to the processor, the processor resets because it is supplied from the auxiliary source of voltage with wide range, which delivers only low direct power and whenever the voltage on the input voltage terminal is switched off, also the voltage on the processor is lost. As a result, on the transformer secondary side only the correct voltage or zero voltage may occur.
  • Example of the connection of transformer power source with wide input range is shown by a block diagram in the attached drawing.
  • connection of transformer power source with wide input range is shown in closer detail in the attached drawing as a block diagram. In order to provide clear understanding the connection is shown with two switches only - the first switch 5 and the second switch 6 .
  • connection consists of the voltage converter 3 , with its output connected to the input of the processor 4 , and of the auxiliary source 2 of the direct voltage with wide range of input voltages, which delivers necessary low power for the processor 4 .
  • Range of the input voltages of the auxiliary power source 2 is selected based on requirements for the transformer power supply source parameters.
  • Output of the auxiliary source 2 of the direct voltage is connected to the power supply input of the processor 4 .
  • One output of the processor 4 is connected to the control input of the first switch 5 and the second output of the processor 4 is connected to the control input of the second switch 6 .
  • Inputs of the auxiliary source 2 of the direct voltage, of the voltage converter 3 , the first switching contact of the first switch 5 and the first switching contact of the second switch 6 are connected to the input voltage terminal 1 .
  • the second switching contact of the first switch 5 and the second switching contact of the second switch 6 are connected to the transformer 7 primary winding tap relevant for them.
  • the output terminals 8 of the secondary winding are the output of the transformer power supply source.
  • the auxiliary source 2 of direct voltage turns on and generates voltage that appears on the processor 4 thus resetting it to the initial state.
  • the signals controlling the first switch 5 and the second switch 6 are in the state that the contacts of the first switch 5 and the second switch 6 are open.
  • the voltage converter 3 converts the incoming voltage to the value acceptable by the processor 4 , which measures this value and sends corresponding signal to close the first switch 5 or the second switch 6 , and they connect the voltage on the terminal 1 to the corresponding tap on the transformer 7 .
  • On the output terminals 8 of the transformer 7 subsequently appears the corresponding output voltage.
  • Range of the input voltages is given by the requirements for the transformer power supply source with wide range of input voltages, where one of the voltages may be the extra low-voltage up to 50 V as defined by relevant standard, it means e.g. 24 V, and the second voltage may be within the range of low-voltages, i.e. from 50 V up to 1000 V, it means e.g. 230 V.
  • connection may be modified for greater number of different voltages on the terminal 1 by modifying the voltage converter 3 and by changing the number of taps on the transformer 7 and the number of switches. Every additional switch is then connected to another output of the processor 4 .
  • the first switching contacts of the switches are connected to the input voltage terminal 1 and the second switching contacts of the switches are connected to other transformer 7 primary winding taps relevant for them.
  • the switches may be realized as electromechanical relays or as semiconductor switches with relevant parameters.
  • the advantage of implementing this invention is less complex transformer design, saved space needed for installation, and eventually also lower costs of overall design and installation.
  • the invention may be implemented anywhere where alternating voltages of various values occur in the distribution network but the end-device requires to be supplied with the alternating voltage of specified value only that can change between the zero voltage state and the state with specified voltage and will not fluctuate due to switching between taps and gradual setting up to the correct value of the output voltage.
  • An example can be the installation of an electronic unit in a distribution network where alternately occurs the low operational voltage 230 V and the extra-low protection voltage 24 V, while such electronic unit needs to be supplied with power in either case.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Ac-Ac Conversion (AREA)
EP15199276.5A 2015-04-20 2015-12-10 Connexion d'une source transformateur avec une gamme d'entrée étendue Withdrawn EP3088985A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2015-264A CZ305925B6 (cs) 2015-04-20 2015-04-20 Zapojení transformátorového zdroje s velkým vstupním rozsahem

Publications (1)

Publication Number Publication Date
EP3088985A1 true EP3088985A1 (fr) 2016-11-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15199276.5A Withdrawn EP3088985A1 (fr) 2015-04-20 2015-12-10 Connexion d'une source transformateur avec une gamme d'entrée étendue

Country Status (2)

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EP (1) EP3088985A1 (fr)
CZ (1) CZ305925B6 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7014860A (fr) * 1969-10-20 1971-04-22
DE2700755A1 (de) * 1976-10-30 1978-05-03 Marconi Co Ltd Elektrische regeleinrichtung
US5808454A (en) * 1997-02-28 1998-09-15 Chung; Young Choon Alternating current power control device
US6417651B1 (en) * 2000-05-02 2002-07-09 James W. Kronberg Digitally-controlled AC voltage stabilizer
WO2008027052A2 (fr) * 2006-08-31 2008-03-06 Otis Elevator Company Gestion de variations de source d'énergie dans un système d'attaque d'un ascenseur

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50497Y1 (fr) * 1970-08-13 1975-01-09
DE3721591A1 (de) * 1987-06-30 1989-01-12 Siemens Ag Verfahren zum primaerseitigen umschalten des uebersetzungsverhaeltnisses eines transformators und einrichtung zur durchfuehrung des verfahrens
GB2464820A (en) * 2008-10-28 2010-05-05 Champion Aerospace Inc Regulation of aircraft power supply
CN201369705Y (zh) * 2009-03-04 2009-12-23 魏明 部分绕组调压变压器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7014860A (fr) * 1969-10-20 1971-04-22
DE2700755A1 (de) * 1976-10-30 1978-05-03 Marconi Co Ltd Elektrische regeleinrichtung
US5808454A (en) * 1997-02-28 1998-09-15 Chung; Young Choon Alternating current power control device
US6417651B1 (en) * 2000-05-02 2002-07-09 James W. Kronberg Digitally-controlled AC voltage stabilizer
WO2008027052A2 (fr) * 2006-08-31 2008-03-06 Otis Elevator Company Gestion de variations de source d'énergie dans un système d'attaque d'un ascenseur

Also Published As

Publication number Publication date
CZ2015264A3 (cs) 2016-05-04
CZ305925B6 (cs) 2016-05-04

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