WO2013071933A2 - Mise en correspondance de la consommation d'énergie d'un transformateur électrique avec l'énergie dont a besoin un système d'actionneur linéaire - Google Patents

Mise en correspondance de la consommation d'énergie d'un transformateur électrique avec l'énergie dont a besoin un système d'actionneur linéaire Download PDF

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Publication number
WO2013071933A2
WO2013071933A2 PCT/DK2012/000121 DK2012000121W WO2013071933A2 WO 2013071933 A2 WO2013071933 A2 WO 2013071933A2 DK 2012000121 W DK2012000121 W DK 2012000121W WO 2013071933 A2 WO2013071933 A2 WO 2013071933A2
Authority
WO
WIPO (PCT)
Prior art keywords
linear actuator
supply
actuator system
transformer
electrical
Prior art date
Application number
PCT/DK2012/000121
Other languages
English (en)
Other versions
WO2013071933A3 (fr
Inventor
Jeppe Christian Bastholm
Original Assignee
Linak A/S
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 Linak A/S filed Critical Linak A/S
Publication of WO2013071933A2 publication Critical patent/WO2013071933A2/fr
Publication of WO2013071933A3 publication Critical patent/WO2013071933A3/fr

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Classifications

    • 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
    • H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
    • 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/06—Linear motors

Definitions

  • the present invention relates to a method of adjusting energy consumption of a transformer.
  • the invention further relates to a device for adjusting energy consumption of a transformer and a transformer respectively and a control box for controlling a linear actuator comprising such a device.
  • Linear actuator systems comprising at least one linear actuator and a control box for controlling the linear actuator are used in different applications such as in connection with adjustable beds, e.g. hospital beds and adjustable tables.
  • Linear actuator systems are low voltage direct current systems.
  • the drive motor of the linear actuators is low voltage e.g. 20-40V DC-motors and the control electronics might be 5-12V DC.
  • the control box normally contains a network power supply based on an electrical transformer with a rectifier and output smoothing circuit. Normally the control box also comprises a rechargeable battery package as a power supply for running the linear actuator system when it is disconnected from the mains.
  • Use of a network power supply based on an electrical transformer has the benefit that it is very reliable, sturdy, can be heavy loaded even momentarily overloaded without damages and it is relatively inexpensive.
  • An example with dual linear actuators is shown in EP 0 372 032 B2 to Eckhart Dewert.
  • a further example with single linear actuators is shown in DE 298 00 016 U1 to Dewert Antrieb
  • the amount of power needed to be delivered from a transformer to the control box of a linear actuator system varies based on the number of actuators in the actuator system being activated or if no actuator is activated and only control lamps or other low energy consumers in the linear actuator system need energy from the electrical transformer. Further, a transformer constantly uses a small amount of idle power, even though there is a much lower need in the actuator system.
  • An example of such varying energy needs is a linear actuator system for a hospital bed.
  • Such a system comprises a control box for controlling linear actuators, but also other features of the actuator are controlled, such as indicator lamps and e.g. underbed lights, see e.g. US 7,874,695 B2 to Linak A/S.
  • the activation of one or more actuators requires a large amount of energy, whereas activation of only underbed light requires a low amount of energy from the transformer.
  • the object of the invention is therefore to solve the above mentioned problem.
  • the invention relates to a method, a device and a transformer comprising a device and a linear actuator system comprising a device.
  • the amount of power to be delivered can be determined either by measuring the needs or by receiving the information via a communication link, such as a wireless communication link, or it can be preprogrammed in the device. By measuring the current in the primary winding it is possible to calculate the power needed by the electrical device. Thereby the pulses can be adjusted whereby the transformer delivers power matching the needs of the electrical device.
  • the current in the second winding is measured making it possible to more precisely calculate the power needed by the electrical device.
  • the pulses can be adjusted and consequently the transformer delivers power matching the needs of the electrical device.
  • the invention can be used in connection with any linear actuator system, e.g. used in connection with adjustable beds or tables.
  • figure 1 illustrates a transformer with a downscaling device between the electrical network and a control box in a linear actuator system for a hospital bed
  • figure 2 illustrates a transformer with a detailed embodiment of the downscaling device between the electrical network and a control box in a linear actuator system for a hospital bed
  • figure 3 illustrates a transformer with another embodiment of the downscaling device between the electrical network and the control box in a linear actuator system for a hospital bed
  • figure 4 illustrates a specific embodiment where the primary winding current is being measured
  • figure 5 illustrates the principles of the logic in the microcomputer handling the disconnecting and connecting of the transformer
  • figure 6a-e illustrates examples of connecting and disconnecting timing relative to the AC supply.
  • Figure 1 illustrates a transformer 105 with a descaler 103 between the electrical supply (SP) 101 and a control box 109 in a linear actuator system for a hospital bed.
  • the control box is electrically connected to the secondary side 107 of the transformer 105 and the primary side of the transformer is connected to the electrical supply via a descaler 103.
  • the descaler has the functionality of disconnecting and connecting the primary winding to the electrical supply in predefined intervals.
  • the descaler functionality could be integrated in the transformer casing, but it could also be a separate unit adapted to be mounted between the electrical supply and the transformer.
  • both the transformer and the descaler are integrated in the control box.
  • FIG. 2 illustrates a transformer 105 with a detailed embodiment of the downscaling device 103 positioned between the electrical supply 101 and a control box 109 in a linear actuator system for a hospital bed.
  • the descaler 103 comprises a switch 201 for disconnecting and connecting the primary side of the transformer to the electrical supply 101 , and the timing of this disconnecting and connecting is controlled by a processing unit 203 based on the supply signal being input to the processing unit 203.
  • FIG. 3 illustrates an embodiment where the processing unit 203 provides a control signal to a transistor 301 which based on this control signal disconnects and connects the primary winding 106 of the transformer to the electrical supply 101.
  • the timing of disconnecting and connecting depends on the power needed at the input of the control box. In one embodiment this value could be programmed in the processing unit. Alternatively, the processing unit could receive this communication wirelessly, e.g. via an optocoupler.
  • Figure 4 illustrates an embodiment where the processing unit 203 receives input 401 from a sensor measuring the current in the primary winding 108.
  • the amount of current can be used to determine the power needed by the control box. Thereby the timing of disconnecting and connecting can be adjusted and controlled to fit the actual power requirements of the control box. Alternatively, the current in the secondary winding is measured this resulting in a more precise measuring of the power needed by the control box of the linear actuator system.
  • FIG. 5 illustrates the principles of the logic in the microcomputer 203 handling the disconnecting and connecting of the transformer to the electrical supply.
  • the input 307 to the microcomputer is the AC supply signal from the electrical supply, and in 301 it detects characteristics (DT_C) of the AC signal delivered by the electrical supply, whereas in 303 this data, together with input 308 regarding the power needed by the control box of the linear actuator system at the secondary side, is used to determine the timing data for connecting and disconnecting the primary winding to the electrical supply.
  • a switch for disconnecting and connecting is controlled based on the determined timing data.
  • the control signal being the output 309 of the microcomputer.
  • the primary winding is disconnected and then a predefined distance after the AC signal has passed zero the primary winding is connected shortly, where after it is disconnected again. Then the predefined distance after the AC signal has again passed zero the primary winding is connected shortly, where after it is disconnected again.
  • two pulses are obtained having the same length and in the same distance after the signal has passed zero. After these two pulses have been made the primary winding is disconnected for 0.5-1 second, and then the two similar pulses are made by connecting and disconnecting followed by a similar disconnect period.
  • the pulses in respectively the positive and the negative half period should be identical in order to ensure a uniform output power from the transformer.
  • Figure 6a-6e illustrates curves of the connecting and disconnecting timing relative to the AC supply, where the electrical transformer delivers different amount of energy.
  • the area below the switching pulses defines the delivered energy, where a small area or a narrow pulse results in a small amount of energy, whereas a larger area results in a larger amount of energy.
  • the pulses do not need to include the AC peak, it is more important that the distance between a zero transition and a positive pulse and a next zero transition and a negative pulse is equal to ensure a balanced output of the electrical transformer.
  • This connection could in one embodiment be performed continuously by slowly increasing the width of the positive and negative pulse until the power delivered corresponds to the needs of the control box.
  • the pulses in the positive and subsequent negative half period should be identical to ensure a uniform output power from the transformer.
  • the width can be changed immediately in both the positive and negative pulse to the width required for obtaining the necessary output.
  • the width is slowly changed and the output power is constantly measured and compared to a reference value.
  • the widths can be changed in a control loop to ensure that the delivered power and the needed power correspond to each other - thereby avoiding waste of power.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

Cette invention se rapporte à un procédé de réduction de la consommation d'énergie en veille d'un transformateur qui présente un côté primaire et un côté secondaire et qui est positionné entre un système d'actionneur linéaire raccordé au côté secondaire et une alimentation électrique alternative raccordée au côté primaire, l'alimentation électrique alternative provenant, par exemple, d'un réseau de distribution et alimentant en électricité le système d'actionneur linéaire et le transformateur étant conçu pour convertir la sortie de l'alimentation électrique afin de faire correspondre les critères d'entrée du système d'actionneur linéaire. Le procédé comprend les étapes consistant à connecter et à déconnecter la liaison entre le côté primaire et l'alimentation électrique pendant des périodes de temps prédéfinies. L'invention se rapporte en outre à un dispositif permettant de mettre en œuvre le procédé et à un transformateur qui comprend un dispositif permettant de mettre en œuvre le procédé.
PCT/DK2012/000121 2011-11-14 2012-11-13 Mise en correspondance de la consommation d'énergie d'un transformateur électrique avec l'énergie dont a besoin un système d'actionneur linéaire WO2013071933A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201100892 2011-11-14
DKPA201100892 2011-11-14

Publications (2)

Publication Number Publication Date
WO2013071933A2 true WO2013071933A2 (fr) 2013-05-23
WO2013071933A3 WO2013071933A3 (fr) 2014-03-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2012/000121 WO2013071933A2 (fr) 2011-11-14 2012-11-13 Mise en correspondance de la consommation d'énergie d'un transformateur électrique avec l'énergie dont a besoin un système d'actionneur linéaire

Country Status (1)

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WO (1) WO2013071933A2 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372032B1 (fr) 1988-05-07 1992-05-13 Dewert Antriebs- und Systemtechnik GmbH & Co. KG Agencement de reglage de grilles en lattes
DE29800016U1 (de) 1998-01-02 1998-04-09 Dewert Antriebs Systemtech Möbelantrieb
US7874695B2 (en) 2006-11-15 2011-01-25 Linak A/S Electrical actuator system for articles of furniture

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1323441A (en) * 1969-06-20 1973-07-18 Matsushita Electric Ind Co Ltd Converter for changing alternating current into direct current
US4658341A (en) * 1985-05-09 1987-04-14 Hewlett Packard Company Regulated DC power supply
DE19853430A1 (de) * 1997-12-05 1999-08-19 Samsung Kwangju Electronics Co Motorphasensteuervorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0372032B1 (fr) 1988-05-07 1992-05-13 Dewert Antriebs- und Systemtechnik GmbH & Co. KG Agencement de reglage de grilles en lattes
DE29800016U1 (de) 1998-01-02 1998-04-09 Dewert Antriebs Systemtech Möbelantrieb
US7874695B2 (en) 2006-11-15 2011-01-25 Linak A/S Electrical actuator system for articles of furniture

Also Published As

Publication number Publication date
WO2013071933A3 (fr) 2014-03-20

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