WO2003050937A1 - Alimentation electrique a mode commute a deux sorties - Google Patents

Alimentation electrique a mode commute a deux sorties Download PDF

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Publication number
WO2003050937A1
WO2003050937A1 PCT/FI2001/001085 FI0101085W WO03050937A1 WO 2003050937 A1 WO2003050937 A1 WO 2003050937A1 FI 0101085 W FI0101085 W FI 0101085W WO 03050937 A1 WO03050937 A1 WO 03050937A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
output voltage
power supply
current
output
Prior art date
Application number
PCT/FI2001/001085
Other languages
English (en)
Inventor
Jan Anders Jansson
Original Assignee
Vdsl Systems Oy
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 Vdsl Systems Oy filed Critical Vdsl Systems Oy
Priority to PCT/FI2001/001085 priority Critical patent/WO2003050937A1/fr
Priority to AU2002217190A priority patent/AU2002217190A1/en
Publication of WO2003050937A1 publication Critical patent/WO2003050937A1/fr

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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Definitions

  • the invention relates to a switched mode power supply with two output polarities.
  • the aim of the invention is to provide a negative output voltage in excess of the positive output voltage with a cost effective and simple way by adding only minimal circuitry and design work compared to the typical dual polarity switch mode power supply of e.g. buck type.
  • the power supply according to the invention is using the basic configuration of single output voltage switch-mode power supply and generating a second voltage of opposite polarity by causing a voltage difference on the current path of the first output voltages load.
  • the power supply according to the invention is cheaper and smaller than a dual supply, because it needs only one inductor, and the current through the inductor is not larger than that of a single voltage supply.
  • the switch 1 must resist higher voltages, but that makes only small difference of no difference on size or cost.
  • the minimum added components are: a capacitor and a zener-diode or a simple voltage triggered switch e.g. a silicon controlled rectifier with voltage triggering circuit. This makes a significant price and size difference for on-board regulated dual voltage supply. It is nice to use as few external inductors or transformers as possible. Inductors and transformers are in many senses unpleasant to use in electronic devices.
  • Figures are referred for explanation on some preferred embodiments; also a figure with waveforms of a live prototype is included for better understanding.
  • Figure 1 Basic well-known buck-mode switching power supply.
  • Figure 2 Currents in the Fig. 1 circuit, when the switch is closed.
  • Figure 3 Currents in the Fig. 1 circuit, when the switch is open.
  • Figure 4 An embodiment according the invention, using a zener-diode.
  • Figure 5 Currents in the Fig. 4 circuit, when the switch is closed.
  • Figure 7 Measured voltages in the prototype according the embodiment of figure 4.
  • Figure 8 An alternative solution, using switch as a voltage regulator for the negative output voltage.
  • Figure 9 A boost type configuration with linear regulation according the invention.
  • figure 1 there is a basic configuration of a buck-type switching mode power supply.
  • This circuit converts the voltage from direct current source 20 to a lower voltage with correspondingly larger current to the load 21.
  • the switching circuit 1 chops the current from the input voltage source 20 and the inductor 11 works like a fly-wheel and keeps the current nearly the same when the switch inside switching circuit is closed. This forces the current to flow through the diode 2.
  • the switching circuit 1 typically includes voltage and current sensors for output voltage, oscillator and control electronics to provide a good output voltage stability and to protect against short-circuiting or over-currents.
  • the figures 2 and 3 show the current paths, when the switch in the switching circuit 1 is open and closed.
  • the regulating device 3 can also be advantageously a silicon controlled rectifier, a CMOS-transistor or other type of switch or regulator that passes the current to flow to the inductor after the desired voltage is charged in the capacitor 13. If a switch is used, it is necessary to prevent the capacitor 13 to discharge through the switch. This is possible to make i.e. by applying a diode or by using several switches.
  • a switch mode power supply of buck type can be added a negative output voltage simply by adding a switch, resistor with a diode, zener-diode or any other kind of current limiting device 3 on the current path of the more negative side of the positive output voltage Ul ou t-
  • This resistance to current causes a voltage difference during the discharge cycle of the inductor 11. Because the inductor is working like a flywheel, that voltage difference is generating a voltage more negative than the earth-level of the input voltage supply 20. This same voltage difference causing a negative voltage on the other terminal of the inductor during the switch 1 open time appears over the diode 2 of the basic buck-type voltage supply, but it is normally considered as an unwanted effect, that lowers the efficiency of the power supply. If a switched type of regulating device is used, the voltage difference can be generated also during the open time of switch 1, and also the power loss of the linear regulator 3 is avoided.
  • the same kind of generation of negative voltage is realisable also in case of boost or buck-boost type of switching power supply.
  • the circuit configuration is essentially same as in the buck type switch mode supply.
  • the current path from the more negative terminal of the positive output voltage Voutl is provided to the inductor 11 so that it forms a closed loop during the inductors discharge period. So that the current loop essentially comprises both output voltages loads, shunt current regulating device for negative voltage or possible a branch to ground not included on the closed loop.
  • the switch mode power supply outputs at least a first output voltage Ul ou t and a second output voltage U2 0u t of opposite polarity to the first output voltage.
  • the first voltage is generated and controlled by switching current flow from a input voltage supply 20 to a inductor 11 so that current flows periodically to the inductor 11 from input power supply 20 or the current from the input voltage source 20 flows through the inductor 11 and the inductor 11 is periodically short- circuited to ground level to charge energy in the inductor 11, so that the inductor 11 is charged with the current from the input power supply.
  • the switch 1 opens the current stored in the inductor 11 is used to generate output voltages 21, 22.
  • a second output voltage U2 0u t is generated. If one terminal of the current limiting device is on the ground level, a voltage of opposite polarity to the voltage of the first output voltage Ul ou t is generated on the other terminal. At least during the current limiting period for creating the second output voltage, the current path of the second voltage includes the inductor that provides the energy for the power supply during discharge period.
  • the switching type of the second output voltages U2 0Ut regulation can bypass only the second output voltage U2 ou t- The discharge of filter capacitor 13 must be prevented to discharge during the by-pass of the current. That can be made by a switch or diode (not shown).
  • the highest possible current output of the second output voltage is limited to the current of the first load 21.
  • the maximum current depends on the duty-ratio of the switch 1 and the current through load 21.
  • the duty cycle depends greatly on the input voltage 20 and the ratio to the output voltage U2 ou t-
  • the second output voltage U2 o ut has an output current that is remarkably lower than the current of the first output voltage's load 21. It is possible to provide a current path to by-pass the first load 21 periodically so that the filter capacitors 12, 13 are not discharged. This is normally not needed in large variety of appliances.
  • the negative voltage is needed only for the analogue circuits and has much smaller maximum current than the smallest used positive current.
  • the embodiment according to the invention is included in the telecommunication devices circuit board, the mains power supply being a cheap unregulated DC-power supply. This makes possible to have a negative voltage onboard with minimal cost and use a cheap and well-available mains power supply for each country according the country's approval requirements.
  • a typical configuration is to use a mains power supply of higher output voltage than needed on-board. In this case the preferred embodiment is that of figure 4 or 8.
  • One preferred embodiment is to design an integrated circuit that comprises the active electronics needed for a embodiment according the invention or at least most of the necessary devices. This approach makes possible to get a dual polarity voltages with use of only one integrated circuit and one coil and the necessary filter capacitors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

La présente invention concerne une alimentation électrique à double tension à mode de commutation qui génère la seconde tension de sortie (U2out) par induction d'une différence de potentiel sur le trajet de courant de la charge (21) de la première tension de sortie (U1out) et par la commande de cette seconde tension de sortie (U2out) au moyen d'un dispositif (3) de régulation de courant commandé en tension qui permet de dériver le courant de la seconde sortie de tension (U2out), lorsqu'un niveau recherché de cette seconde tension de sortie est atteint sur les pôles du condensateur de filtrage (13) de cette seconde tension de sortie.
PCT/FI2001/001085 2001-12-12 2001-12-12 Alimentation electrique a mode commute a deux sorties WO2003050937A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/FI2001/001085 WO2003050937A1 (fr) 2001-12-12 2001-12-12 Alimentation electrique a mode commute a deux sorties
AU2002217190A AU2002217190A1 (en) 2001-12-12 2001-12-12 Switched mode power supply with two outputs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2001/001085 WO2003050937A1 (fr) 2001-12-12 2001-12-12 Alimentation electrique a mode commute a deux sorties

Publications (1)

Publication Number Publication Date
WO2003050937A1 true WO2003050937A1 (fr) 2003-06-19

Family

ID=8555934

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2001/001085 WO2003050937A1 (fr) 2001-12-12 2001-12-12 Alimentation electrique a mode commute a deux sorties

Country Status (2)

Country Link
AU (1) AU2002217190A1 (fr)
WO (1) WO2003050937A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT501512A1 (de) * 2005-02-22 2006-09-15 Felix Dipl Ing Dr Himmelstoss Dc/dc konverter für symmetrische spannungen mit nur einer spule
DE102011087087A1 (de) * 2011-11-25 2012-08-30 Semikron Elektronik Gmbh & Co. Kg Ansteuerschaltung zur Ansteuerung eines Leistungshalbleiterschalters

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3912849A1 (de) * 1988-04-19 1989-11-02 Ceag Licht & Strom Stromversorgungsgeraet
DE4021385A1 (de) * 1990-07-05 1992-01-16 Philips Patentverwaltung Schaltungsanordnung zur erzeugung von zwei gleichspannungen
EP0734009A2 (fr) * 1995-03-20 1996-09-25 Siemens Aktiengesellschaft Circuit pour la génération d'une tension de sortie réglable plus grande que la tension d'entrée, notamment pour la fourniture de tension de contraste pour des dispositifs d'affichage à cristaux liquides
US5701238A (en) * 1994-08-01 1997-12-23 Siemens Aktiengesellschaft Flow-through DC voltage changer having a further output circuit
US6130828A (en) * 1999-08-26 2000-10-10 Lucent Technologies, Inc. Multiple output converter having self-synchronized pulse width modulation regulation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3912849A1 (de) * 1988-04-19 1989-11-02 Ceag Licht & Strom Stromversorgungsgeraet
DE4021385A1 (de) * 1990-07-05 1992-01-16 Philips Patentverwaltung Schaltungsanordnung zur erzeugung von zwei gleichspannungen
US5701238A (en) * 1994-08-01 1997-12-23 Siemens Aktiengesellschaft Flow-through DC voltage changer having a further output circuit
EP0734009A2 (fr) * 1995-03-20 1996-09-25 Siemens Aktiengesellschaft Circuit pour la génération d'une tension de sortie réglable plus grande que la tension d'entrée, notamment pour la fourniture de tension de contraste pour des dispositifs d'affichage à cristaux liquides
US6130828A (en) * 1999-08-26 2000-10-10 Lucent Technologies, Inc. Multiple output converter having self-synchronized pulse width modulation regulation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT501512A1 (de) * 2005-02-22 2006-09-15 Felix Dipl Ing Dr Himmelstoss Dc/dc konverter für symmetrische spannungen mit nur einer spule
AT501512B1 (de) * 2005-02-22 2009-05-15 Felix Dipl Ing Dr Himmelstoss Dc/dc konverter für symmetrische spannungen mit nur einer spule
DE102011087087A1 (de) * 2011-11-25 2012-08-30 Semikron Elektronik Gmbh & Co. Kg Ansteuerschaltung zur Ansteuerung eines Leistungshalbleiterschalters

Also Published As

Publication number Publication date
AU2002217190A1 (en) 2003-06-23

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