WO1999065135A1 - Systeme de suppression de bruit pour alimentation en energie - Google Patents

Systeme de suppression de bruit pour alimentation en energie Download PDF

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Publication number
WO1999065135A1
WO1999065135A1 PCT/GB1999/001787 GB9901787W WO9965135A1 WO 1999065135 A1 WO1999065135 A1 WO 1999065135A1 GB 9901787 W GB9901787 W GB 9901787W WO 9965135 A1 WO9965135 A1 WO 9965135A1
Authority
WO
WIPO (PCT)
Prior art keywords
primary
power supply
feed
transformer
voltage
Prior art date
Application number
PCT/GB1999/001787
Other languages
English (en)
Inventor
William Miller
Original Assignee
Linn Products Limited
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 Linn Products Limited filed Critical Linn Products Limited
Priority to AU42774/99A priority Critical patent/AU4277499A/en
Publication of WO1999065135A1 publication Critical patent/WO1999065135A1/fr

Links

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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters

Definitions

  • the present invention relates to a noise suppression system for a Switch Mode Power Supply (SMPS) such as those typically found in audio amplifiers, televisions, monitors, computers and the like. More particularly, the invention relates to a system for suppressing noise arising from parasitic interwinding capacitance in a transformer forming part of a SMPS.
  • SMPS Switch Mode Power Supply
  • Appliances such as audio amplifiers, televisions, monitors, computers and the like operate from standard Alternating Current (AC) mains power supplies, and therefore require internal power supply units incorporating step-down transformers and rectifiers of a known type to step the voltage down to levels suitable for operating the appliance, and rectify to DC.
  • AC Alternating Current
  • the incoming AC mains voltage is converted to unregulated DC, and individual circuits are powered by separate DC-to-DC converters, most commonly switch mode converters, which may be regulated or unregulated.
  • a SMPS operates at a high frequency, which may commonly be in the range of 60-250 kHz, and thus is liable to generate electromagnetic noise.
  • One particular source of unwanted "noise" arises from the parasitic interwinding capacitance between the primary and secondary windings of a transformer (also referred to as the interwinding capacitance) .
  • the efficiency of a transformer is increased by improving the flux linkage between the transformer windings.
  • the flux linkage can be increased by increasing the proximity of the primary and secondary windings. However, this also has the effect of increasing the interwinding capacitance.
  • the interwinding capacitance has the effect of introducing noise to the output from the secondary winding, in the form of spikes at the edges of the square waveform.
  • this noise is reduced by filtering the output from the secondary winding; e.g. by the use of a capacitor connected between the secondary winding and the primary DC supply.
  • a switch mode power supply having a noise suppression system;
  • the power supply including a transformer having primary and secondary windings and means for switching an input voltage across the primary winding;
  • the noise suppressing system comprising a feed-forward system arranged to supply a feed- forward voltage to the transformer secondary, the feed-forward voltage being an inverted proportion of the voltage applied to the primary and the feed forward system including a capacitor such that the output from the feed-forward system substantially cancels noise arising in the transformer secondary as a consequence of the interwinding capacitance between the transformer primary and secondary windings.
  • said capacitor has a capacitance
  • C w is the interwinding capacitance of the transformer
  • x is the value of said proportion of the voltage applied to the primary.
  • the feed-forward system comprises an inverting operational amplifier having an output connected to the secondary via said capacitor.
  • said proportion of the voltage applied to A the primary is determined by a voltage divider resistance pair connected in the primary.
  • the power supply is a half-bridge arrangement, the switching means being a pair of MOSFETs, and the resistance pair is connected across one side of the primary.
  • the noise suppression system further includes a second capacitor connected between the transformer secondary and the primary DC supply.
  • Fig 1 is a circuit diagram of a switch mode power supply incorporating conventional means for suppressing noise arising from interwinding capacitance;
  • Fig 2 is a circuit diagram of a switch mode power supply incorporating improved means for suppressing noise arising from interwinding capacitance, in accordance with the present invention.
  • Figs 3A, 3B and 3C are waveforms in particular portions of the circuits of Fig 1 and Fig 2.
  • Fig. 1 there is shown generally at 1 an example of a circuit for a conventional switch mode power supply (SMPS) .
  • SMPS switch mode power supply
  • the SMPS includes a transformer shown generally at 2 having a primary coil 3 and a secondary coil 4.
  • the SMPS is driven by a DC power supply across lines 5 and 6.
  • Two Metal Oxide Silicon Field Effect Transistors (MOSFETs) 7 and 8 are provided between the power lines 5 and 6, and the MOSFETs 7 and 8 are switched alternately (by a conventional driving circuit not shown) to generate a substantially square wave voltage waveform V s which is applied to the transformer primary 3.
  • the transformer primary 3 is connected between the voltage V s and the power supply lines 5 and 6 via coupling capacitors 9 and 10.
  • the waveform of the voltage V s is shown generally in Fig 3A. It will be understood that the waveform V s applied to the primary winding 3 could be generated by any other suitable switching network.
  • the output from the secondary winding 4 is applied to a voltage rectifying and/or regulating circuit or the like, generally designated at 22, to produce the required final output from the SMPS.
  • Noise is introduced into the output from the secondary winding 4 as a result of the interwinding capacitance C w which exists between the primary and secondary windings 3 and 4.
  • the interwinding capacitance C w results in spikes being introduced into the output from the secondary winding 4 at locations corresponding to the edges of the square wave, as indicated in Fig. 3B.
  • this noise is filtered by means of a capacitor 20 connected between the secondary winding 4 and the primary DC supply.
  • the effectiveness of such passive filtering is limited by the size and cost of the capacitor 20 required to compensate for the interwinding capacitance C w .
  • the noise generated would have the waveform V 0 as shown in Fig 3B, having a peak to peak Voltage of the order of IV.
  • Fig 2 there is shown a circuit for a SMPS incorporating a noise suppression system according to a preferred embodiment of the invention, in which parts equivalent in function to the parts shown in Fig 1 have the same reference numerals.
  • a voltage divider shown generally at 11 is connected between V s and the primary ground 6, the voltage divider 11 having first and second resistors 12 and 13.
  • the centre voltage of the voltage divider 11 is supplied via line 14 to the inverting input 16 of an inverting operational amplifier 15, the non-inverting input 17 of the amplifier 15 being connected to the primary ground line 6.
  • the amplifier 15 is arranged in an inverting feedback implementation, with a feedback resistor 21.
  • the waveform of the output of the inverting amplifier 15 is a fraction of the switching voltage waveform V s applied to the transformer, its value being set by the values of the resistors 12, 13 and 21.
  • the inverting operational amplifier 15 inverts the waveform of the supply entering the amplifier 15 to 180° out of phase with the supply voltage V s , having a peak to peak voltage equivalent to a fraction of that of V s , as stated above.
  • This supply from the output 18 of the operational amplifier 15 is' fed to the secondary side of the circuit at the output of the secondary winding 4 of the transformer 2.
  • the arrangement is therefore a feed-forward voltage system.
  • the output from the operational amplifier 15 is fed to the secondary side of the circuit via a capacitor 19, the value of which is selected on the basis of the interwinding capacitance C w and the fraction of the switching voltage waveform determined by the voltage divider 11, as shall be discussed further below.
  • the capacitor 19 modifies the output from the operational amplifier 15 in the same way that the interwinding capacitance C w modifies the waveform V s . Since the output from the operational amplifier 15 is 180° out of phase with the waveform V s , the resultant signal is substantially equal and opposite to that generated by C w so that the two signals substantially cancel one another.
  • the circuit also includes capacitor 20A, corresponding to capacitor 20 of Fig. 1.
  • the value of capacitor 20A can be substantially less than that of capacitor 20. This provides a well balanced system wherein noise suppression is provided in the event of failure of one or both of the capacitors 19 or 20A or the amplifier 15.
  • the waveform after cancellation is shown at Fig 3C, showing that the peak to peak voltage without cancellation is of the order of 1 Volt (as in Fig 3B) , and with cancellation is of the order of 0.1 Volts.
  • the capacitance of filter capacitor 19 is preferably equivalent to C w (the interwinding capacitance of the transformer 2) multiplied by a factor x which, is equivalent to that factor by which the supply Voltage V s is reduced at the output 18 of the amplifier 15.
  • C 19 x.
  • C w and the voltage at output 18 of the amplifier 15 is equal to V s /x.
  • the cancelled or partially suppressed noise (the waveform of which is shown at Fig 3C) is reduced to acceptable levels which can be dissipated in known ways, for example leakage through earth wires.
  • the invention thus provides improved means for suppressing noise arising from the interwinding capacitance C w by generating a substantially equal and opposite signal which substantially cancels the noise at the output from the secondary winding 4. It will be understood that a similar noise-cancelling signal could be generated by means other than that described in the present embodiment. However, the present arrangement is preferred in view of its relative simplicity and low cost.
  • the invention can readily be implemented with an existing SMPS and could also be incorporated into an integrated SMPS unit.

Landscapes

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

Abstract

L'invention concerne une alimentation en énergie à mode commuté qui comprend un tranformateur à enroulements primaire et secondaire (3, 4) et un dispositif (7, 8) de commutation de tension d'entrée aux bornes de l'enroulement primaire (3). Le système est équipé d'un mécanisme de suppression du bruit à système de précompensation (15, 16, 17, 21) conçu pour fournir une tension de précompensation à l'enroulement secondaire (4) du transformateur, cette tension correspondant à une proportion inverse de la tension appliquée à l'enroulement primaire. Le système de précompensation comprend un condensateur (19) faisant que la sortie du système annule sensiblement le bruit naissant dans l'enroulement secondaire du transformateur suite à l'établissement d'une capacité interenroulement (Cw) entre les enroulements primaire (3) et secondaire (4) du transformateur. De plus, le système de suppression de bruit peut comprendre un second condensateur (20A) mis en circuit entre l'enroulement secondaire et la ligne d'alimentation en courant continu de l'enroulement primaire.
PCT/GB1999/001787 1998-06-06 1999-06-07 Systeme de suppression de bruit pour alimentation en energie WO1999065135A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42774/99A AU4277499A (en) 1998-06-06 1999-06-07 Noise suppression system for a power supply

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9812138.7 1998-06-06
GBGB9812138.7A GB9812138D0 (en) 1998-06-06 1998-06-06 Noise suppression system for a power supply

Publications (1)

Publication Number Publication Date
WO1999065135A1 true WO1999065135A1 (fr) 1999-12-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/001787 WO1999065135A1 (fr) 1998-06-06 1999-06-07 Systeme de suppression de bruit pour alimentation en energie

Country Status (3)

Country Link
AU (1) AU4277499A (fr)
GB (1) GB9812138D0 (fr)
WO (1) WO1999065135A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10048094A1 (de) * 2000-09-28 2002-04-18 Abb Patent Gmbh Schaltnetzteil mit einer Einrichtung zur Funkstörspannungskompensation
EP1760869A1 (fr) * 2005-09-05 2007-03-07 Ideassociates (IOM) Limited Une alimentation de puissance de courant continu à courant continue
WO2007028384A1 (fr) * 2005-09-05 2007-03-15 Ideassociates (Iom) Ltd. Procédé de commande de moteur électrique commuté mécaniquement
WO2009088895A2 (fr) * 2008-01-04 2009-07-16 Cue Acoustics, Inc. Dispositif audio doté d'une alimentation à commutation intégrée
US7952412B2 (en) 2008-01-04 2011-05-31 Cue Acoustics, Inc. Audio device using AC power clock reference
EP2787619A1 (fr) * 2013-03-29 2014-10-08 Hamilton Sundstrand Corporation Filtre anti-perturbation électromagnétique actif avant d'alimentation
EP2787618A1 (fr) * 2013-03-29 2014-10-08 Hamilton Sundstrand Corporation Filtre anti-perturbation électromagnétique actif en aval d'alimentation en tension
WO2020229413A1 (fr) * 2019-05-13 2020-11-19 Valeo Systemes De Controle Moteur Ensemble comprenant une carte définissant un convertisseur de tension

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3437218A1 (de) * 1984-10-10 1986-04-17 Heimann Gmbh, 6200 Wiesbaden Primaergetaktetes schaltnetzteil
EP0707435A2 (fr) * 1994-10-12 1996-04-17 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Alimentation à découpage pour lampes à incandescence
JPH08294275A (ja) * 1995-04-21 1996-11-05 Canon Inc スイッチング電源
US5724236A (en) * 1996-03-05 1998-03-03 Motorola, Inc. Power converter transformer having an auxilliary winding and electrostatic shield to suppress noise

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3437218A1 (de) * 1984-10-10 1986-04-17 Heimann Gmbh, 6200 Wiesbaden Primaergetaktetes schaltnetzteil
EP0707435A2 (fr) * 1994-10-12 1996-04-17 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Alimentation à découpage pour lampes à incandescence
JPH08294275A (ja) * 1995-04-21 1996-11-05 Canon Inc スイッチング電源
US5724236A (en) * 1996-03-05 1998-03-03 Motorola, Inc. Power converter transformer having an auxilliary winding and electrostatic shield to suppress noise

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31) *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10048094A1 (de) * 2000-09-28 2002-04-18 Abb Patent Gmbh Schaltnetzteil mit einer Einrichtung zur Funkstörspannungskompensation
DE10048094B4 (de) * 2000-09-28 2009-07-09 Abb Ag Schaltnetzteil mit einer Einrichtung zur Funkstörspannungskompensation
EP1760869A1 (fr) * 2005-09-05 2007-03-07 Ideassociates (IOM) Limited Une alimentation de puissance de courant continu à courant continue
WO2007028384A1 (fr) * 2005-09-05 2007-03-15 Ideassociates (Iom) Ltd. Procédé de commande de moteur électrique commuté mécaniquement
WO2007028385A1 (fr) * 2005-09-05 2007-03-15 Ideassociates (Iom) Ltd. Alimentation continu-continu
US8022652B2 (en) 2005-09-05 2011-09-20 Ideassociates (Iom) Ltd. Method for controlling a mechanically communicated electric motor
WO2009088895A3 (fr) * 2008-01-04 2009-10-08 Cue Acoustics, Inc. Dispositif audio doté d'une alimentation à commutation intégrée
US7952412B2 (en) 2008-01-04 2011-05-31 Cue Acoustics, Inc. Audio device using AC power clock reference
WO2009088895A2 (fr) * 2008-01-04 2009-07-16 Cue Acoustics, Inc. Dispositif audio doté d'une alimentation à commutation intégrée
CN101939789B (zh) * 2008-01-04 2013-07-31 Cue声学公司 带集成的开关式电源的音频设备
US8891250B2 (en) 2008-01-04 2014-11-18 Cue, Inc. Audio device with integrated switching power supply
EP2787619A1 (fr) * 2013-03-29 2014-10-08 Hamilton Sundstrand Corporation Filtre anti-perturbation électromagnétique actif avant d'alimentation
EP2787618A1 (fr) * 2013-03-29 2014-10-08 Hamilton Sundstrand Corporation Filtre anti-perturbation électromagnétique actif en aval d'alimentation en tension
WO2020229413A1 (fr) * 2019-05-13 2020-11-19 Valeo Systemes De Controle Moteur Ensemble comprenant une carte définissant un convertisseur de tension
FR3096196A1 (fr) * 2019-05-13 2020-11-20 Valeo Systemes De Controle Moteur Ensemble comprenant une carte définissant un convertisseur de tension

Also Published As

Publication number Publication date
AU4277499A (en) 1999-12-30
GB9812138D0 (en) 1998-08-05

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