EP2876655A1 - Circuit et procédé pour recycler un courant - Google Patents

Circuit et procédé pour recycler un courant Download PDF

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Publication number
EP2876655A1
EP2876655A1 EP13193637.9A EP13193637A EP2876655A1 EP 2876655 A1 EP2876655 A1 EP 2876655A1 EP 13193637 A EP13193637 A EP 13193637A EP 2876655 A1 EP2876655 A1 EP 2876655A1
Authority
EP
European Patent Office
Prior art keywords
power source
load
current
type switch
circuit
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Withdrawn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
EP13193637.9A
Other languages
German (de)
English (en)
Inventor
Marco Pastrello
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.)
Danfoss AS
Original Assignee
Danfoss AS
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 Danfoss AS filed Critical Danfoss AS
Priority to EP13193637.9A priority Critical patent/EP2876655A1/fr
Publication of EP2876655A1 publication Critical patent/EP2876655A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • H01F7/08Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • H01F7/1811Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current demagnetising upon switching off, removing residual magnetism
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00Magnets
    • H01F7/06Electromagnets; Actuators including electromagnets
    • H01F7/08Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F2007/1888Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings using pulse width modulation

Definitions

  • the present invention relates to a circuit and an associated method for automatic recirculation of currents within said circuit. I n particular the present invention facilitates that pulse width modulated (PWM) currents, DC currents with any polarity as well as AC currents may be recirculated in an automatic manner when the load is disconnected from the power source.
  • PWM pulse width modulated
  • Recirculation of AC currents in circuits including inductive loads is known to be complicated. I n particular, recirculation of AC currents and recirculation of DC currents with both positive and negative polarities is complicated.
  • US 6,670,792 discloses how a DC current with the help of a traditional diode may be recirculated. However, the arrangement presented in US 6,670,792 only allows that DC currents originating from a voltage of a certain polarity may be recirculated. A current driven by a voltage of the opposite polarity may not be recirculated.
  • WO 2012/021072 shows an arrangement where AC current may be recirculated by sequentially shunting diodes in the positive and the negative half periods. Controllable switches are applied for shunting the diodes.
  • the arrangement suggested in WO 2012/021072 appears to be a complicated and expensive arrangement.
  • a circuit for passing AC or DC power from a power source to a connected load comprising
  • the power source may in principle be any kind of power source including all sorts of AC and DC power source.
  • a PWM circuit may be applied to modulate the output of the power source.
  • the first current path may comprise a NPN type switch and a diode arranged to conduct in the first direction.
  • the second current path may comprise a PNP type switch and a diode arranged to conduct in the second direction.
  • the first and second direction may, at least through the load, be opposite current directions.
  • either the first or the second current path is activated automatically immediately after the main switch is opened.
  • the direction of the current in the load determines which of the two recirculating current paths to be activated. It is advantageous that no specific and dedicated actions need to be taken in order to activate a given recirculation path. The activation is performed automatically.
  • the NPN and the PNP switches may be connected to the power source via respective gate resistors.
  • At least part of the first and second current paths may be arranged in parallel.
  • the NPN type switch and the PNP type switch may be arranged in parallel to each other, and furthermore they may be arranged in parallel over the load.
  • the present invention relates to a power supply unit comprising a circuit according to the first aspect.
  • the present invention relates to a method for automatic recirculating AC or DC power within a circuit comprising a power source and a load connectable thereto, the method comprising the steps of
  • the load is disconnected from the power source by opening a main switch in the form of a controllable switch.
  • either the first or the second current path is activated automatically immediately after the main switch is opened, i.e. immediately after the load has been disconnected from the power source.
  • no specific and dedicated actions need to be taken in order to activate a given recirculation path.
  • the first current path may comprise a NPN type switch and a diode arranged to conduct in the first direction.
  • the second current path may comprise a PNP type switch and a diode arranged to conduct in the second direction.
  • the NPN type switch and the PNP type switch may be arranged in parallel over the load.
  • the present invention relates to a circuit and an associated method for recirculating a current within said circuit in an automatic manner.
  • the circuit comprises a power source and a load connectable thereto.
  • the current recirculation is a consequence of the load being abruptly disconnected from the power source.
  • the circuit is operable with both AC and DC power sources.
  • I n case of a DC power source the polarity of the power source voltage is of no importance.
  • pulse width modulated power source voltages may be applied to the load as well.
  • the load may in principle be any kind of load, such as a resistive, an inductive or a capacitive load.
  • a resistive such as a resistive
  • an inductive load the associated inductive current must be recirculated when the load is disconnected from the power source.
  • a circuit 100 according to an embodiment of the present invention is depicted.
  • a power source 101 is connected to a load 102 via a closed switch 103.
  • the circuit 100 depicted in Fig. 1 is designed to be operated at 24 V AC.
  • the power source may deliver AC or DC power having different voltage levels, such as voltage levels up to around 220 V.
  • the polarities of DC power sources are arbitrary.
  • the power source voltage may, without any complications, be pulse width modulated with a modulation frequency of up to 1 kHz. However, higher modulation frequencies may be applicable as well.
  • the circuit 100 comprises two oppositely directed recirculation paths.
  • the first path comprises switch 107 and diode 106 whereas the second path comprises switch 105 and diode 104.
  • Diodes 110 and 111 serve as overvoltage protection circuits for the switches 105 and 107, respectively.
  • the first and second recirculation paths are arranged parallel to each other and parallel to the load 1 02 as well.
  • the gates of the switches 1 05 and 1 07 are connected to the power source 1 01 via respective gate transistors 1 09 and 1 08.
  • the switches 1 05 and 1 07 are PNP and NPN type switches, respectively.
  • the circuit according to the present invention is capable of biasing the correct switch (105 or 107) automatically without applying additional drive circuits.
  • This automatic biasing of the correct switch (105 or 107) ensures that a current recirculation path is established automatically when the load is disconnected from the power source.
  • Fig. 2 shows how the load current, I, is automatically recirculated when the switch 203 is opened.
  • the "plus” shown in Fig. 2 indicates the polarity of the power source voltage.
  • the current, I automatically recirculates in the circuit containing the load 202, the switch 207 and the positively biased diode 206.
  • an oppositely directed current may recirculate in the loop comprising the load 202, the switch 205 and the diode 204.
  • diodes 210 and 211 serve as overvoltage protection circuits for the switches 205 and 207, respectively.
  • the current starts recirculating automatically as soon as the switch 103, 203 is opened.
  • no transistors or other types of switches are to be activated in order to allow recirculation of currents.
  • This automatic recirculation behaviour is completely independent of the polarity and the nature (DC or AC) of the currents.
  • PWM currents may be recirculated automatically.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
EP13193637.9A 2013-11-20 2013-11-20 Circuit et procédé pour recycler un courant Withdrawn EP2876655A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13193637.9A EP2876655A1 (fr) 2013-11-20 2013-11-20 Circuit et procédé pour recycler un courant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13193637.9A EP2876655A1 (fr) 2013-11-20 2013-11-20 Circuit et procédé pour recycler un courant

Publications (1)

Publication Number Publication Date
EP2876655A1 true EP2876655A1 (fr) 2015-05-27

Family

ID=49680808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13193637.9A Withdrawn EP2876655A1 (fr) 2013-11-20 2013-11-20 Circuit et procédé pour recycler un courant

Country Status (1)

Country Link
EP (1) EP2876655A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000184783A (ja) * 1998-12-15 2000-06-30 Omron Corp 交流電圧制御装置
JP2000293243A (ja) * 1999-04-07 2000-10-20 Mitsubishi Electric Corp 電圧可変装置
US6188203B1 (en) * 1996-11-01 2001-02-13 Lucas Aerospace Power Equipment Corporation Ground fault detection circuit
US6670792B1 (en) 2001-09-07 2003-12-30 International Rectifier Corporation Alternator regulation circuit having parallel field coil current re-circulation
JP2006333588A (ja) * 2005-05-25 2006-12-07 Nippon Inter Electronics Corp 交流電力調整器
US20110157942A1 (en) * 2009-12-28 2011-06-30 Flyback Energy Inc. Controllable Universal Supply with Reactive Power Management
WO2012021072A1 (fr) 2010-08-13 2012-02-16 Auckland Uniservices Limited Commande de transfert inductif d'énergie

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6188203B1 (en) * 1996-11-01 2001-02-13 Lucas Aerospace Power Equipment Corporation Ground fault detection circuit
JP2000184783A (ja) * 1998-12-15 2000-06-30 Omron Corp 交流電圧制御装置
JP2000293243A (ja) * 1999-04-07 2000-10-20 Mitsubishi Electric Corp 電圧可変装置
US6670792B1 (en) 2001-09-07 2003-12-30 International Rectifier Corporation Alternator regulation circuit having parallel field coil current re-circulation
JP2006333588A (ja) * 2005-05-25 2006-12-07 Nippon Inter Electronics Corp 交流電力調整器
US20110157942A1 (en) * 2009-12-28 2011-06-30 Flyback Energy Inc. Controllable Universal Supply with Reactive Power Management
WO2012021072A1 (fr) 2010-08-13 2012-02-16 Auckland Uniservices Limited Commande de transfert inductif d'énergie

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