EP1350322A1 - Commutation sous commande en mode a deux fils - Google Patents

Commutation sous commande en mode a deux fils

Info

Publication number
EP1350322A1
EP1350322A1 EP01983290A EP01983290A EP1350322A1 EP 1350322 A1 EP1350322 A1 EP 1350322A1 EP 01983290 A EP01983290 A EP 01983290A EP 01983290 A EP01983290 A EP 01983290A EP 1350322 A1 EP1350322 A1 EP 1350322A1
Authority
EP
European Patent Office
Prior art keywords
switching
switching device
energy storage
circuit
gating
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Withdrawn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
EP01983290A
Other languages
German (de)
English (en)
Other versions
EP1350322A4 (fr
Inventor
Peter Birrell
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.)
HPM Industries Pty Ltd
Original Assignee
HPM Industries Pty Ltd
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 HPM Industries Pty Ltd filed Critical HPM Industries Pty Ltd
Publication of EP1350322A1 publication Critical patent/EP1350322A1/fr
Publication of EP1350322A4 publication Critical patent/EP1350322A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/041—Controlling the light-intensity of the source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Definitions

  • This invention relates to an electrical circuit which facilitates electrically controlled actuation of a switching device in a two-wire circuit where access may be gained only to an active or line conductor (herein referred to as an active conductor).
  • the invention has been developed in relation to remotely controlled lighting circuits, for example lighting circuits that are switched responsive to an output being obtained from a timer or a motion detector, and the invention is hereinafter described in such context. However, it will be understood that the invention does have broader application.
  • Lighting circuits in buildings typically are powered from twin-core (active and neutral) wiring that is located above ceilings of the buildings.
  • twin-core wiring normally is used for connecting a wall switch in circuit between an above-ceiling active conductor and the active side of a ceiling-mounted light fitting. That is, in a typical building situation a neutral conductor is not normally available below ceiling level and provision does not, therefore, exist for taking power from the circuit below ceiling level. Therefore, provision cannot conveniently be made for effecting electrically controlled switching of lighting, for example by using a relay that requires power to energise its coil.
  • the capacitor charge is then used to energise the relay ON coil, when the relay is to be actuated to a closed condition, but the relay may be maintained in a closed condition only for such time as it takes for the capacitor to discharge to a level below that at which the relay OFF coil is energised.
  • the present invention provides an alternative approach to the problem, one which facilitates sustained actuation of a controlled switching device, such as a relay and which, in a preferred form, provides for electrically controlled actuation of the switching device over a wide range of load currents.
  • the present invention provides a switching circuit which comprises:
  • circuit connections between the junction of the first and second switching devices and the first and second energy storage devices the circuit connections providing for charge replenishment of the first energy storage device and charging of the second energy storing device during the OFF gating periods of the second switching device.
  • the first energy storage device is employed as a source of energy for actuating and latching the first switching device.
  • the first energy storage device is charged to its full capacity over an initial time period following connection of the circuit to a supply voltage but prior to actuation of the first switching device to a conducting condition. Thereafter, when the first switching device has been actuated to a conducting condition, loss of charge from the first energy storage device is replenished with periodic OFF-ON gating of the second switching device. This process is described in more detail later in this specification.
  • the first switching device may comprise a solid state switching device when employed in relatively low power applications, but it preferably comprises a relay having a coil which is energised by an actuating signal that is derived from the first energy storage device. That is, the relay coil is provided with actuating/latching current that is derived from the first energy storage device under controlled conditions.
  • the solid state second switching device preferably comprises a low impedance device, that is one which, in its conducting state, exhibits an impedance that causes a voltage drop which is not greater than about 500 mV rms with a current flow of 10 amps rms.
  • the second switching device most preferably comprises a metal oxide semi-conductor field effect transistor (MOSFET) device.
  • MOSFET metal oxide semi-conductor field effect transistor
  • the gating circuitry preferably is arranged to gate the second switching device to an OFF condition during an initial time interval in each positive half-cycle of the supply and, thereafter, to gate the second switching device ON for the remaining positive half- cycle and the next succeeding negative half-cycle of the supply.
  • the voltage rise across the second switching device is employed to drive charging current to both the first and the second energy storage devices.
  • the gating circuitry is effectively disabled unless and until the first switching device is actuated to a conducting condition.
  • the time interval during which the second switching device is gated to an OFF condition preferably is selected to cause a voltage rise across the device in the order of 10 to 20 volts.
  • the switching circuit as above defined preferably incorporates a processor that is arranged to effect the controlled actuation of the first switching device responsive to an input signal from a manual switching device, a proximity detector, a light level sensor, a motion detector, a remote control (IR or rf) signal sensor or other such device.
  • a processor that is arranged to effect the controlled actuation of the first switching device responsive to an input signal from a manual switching device, a proximity detector, a light level sensor, a motion detector, a remote control (IR or rf) signal sensor or other such device.
  • Figure 1 shows a partly diagrammatic, partly schematic diagram of the switching circuit
  • Figure 2 shows a schematic wiring diagram which incorporates components of the switching circuit as shown in Figure 1 and, additionally, optional processing circuitry.
  • the switching circuit 10 is employed for controlling energisation of a incandescent lamp 11 that is mounted to a ceiling 12.
  • the lamp is mounted to a fitting 13 that includes a looping terminal 14, a switched-active terminal
  • the switching circuit is connected by a two-wire conductor 17 to the active and switched active terminals of the lamp fitting 13.
  • a two-wire single phase ac supply 18 is provided in the usual way above the ceiling 12.
  • the switching circuit 10 comprises an electrically actuated first switching device 19, in the form of an electromagnetic relay, and a series-connected solid state second switching device 20 in the form of a MOSFET.
  • the two switching devices 19 and 20 are connected in a series circuit with the lamp 11 and, thus, across the active-neutral supply 18.
  • a first energy storage device 21 (that includes two capacitors C 2 and C ) is connected across (i.e. in parallel with) the first and second switching devices 19 and 20 and is arranged under controlled conditions (as hereinafter described) to deliver actuating power to the coil 22 of the relay 19.
  • a second energy storage device 23 (that includes a capacitor G,) is connected across the MOSFET 20 and is arranged to store energy for gating the MOSFET 20.
  • Gating circuitry 24 associated with the MOSFET 20 is provided to effect periodic OFF- ON gating of the MOSFET 20 during the time when the relay 19 is actuated to a conducting condition.
  • a circuit connection 25 is made between the relay-MOSFET junction 27 and the first energy storage device 21 to provide charge replenishment of the first energy storage device (by way of capacitor C 2 ) following actuation of the relay 19 and during OFF gating periods of the MOSFET 20.
  • a circuit connection 26 (by which the second energy storage device 23 is connected across the MOSFET 20) provides for periodic charging of the second energy storage device 23 (i.e. charging of the capacitor C 3 ) during the OFF gating periods of the MOSFET 20.
  • control circuit 28 is provided for initiating operation of the switching circuit 10.
  • the control circuit 28 is shown schematically in Figure 1 as comprising a manually operable ON-OFF switch 29.
  • the control circuitry would normally comprise or incorporate some sort of processor circuitry of the type shown (by way of example only) in Figure 2 of the drawings.
  • the relay 19 is open (i.e. de-energised) and that, with no power available to the gating circuit 24, the MOSFET 20 is nonconducting. Then, current will pass through the lamp 11 during successive positive half-cycles (with the active at zero volts with respect to the energy storage devices, as indicated) to charge capacitor C 2 and through the active connection during successive negative half-cycles to charge the capacitor C .
  • the capacitors C 2 and C will normally be fully charged to a total (series) voltage level of 48 volts, as determined by Zener diodoes ZD2 and ZD4, over approximately a 20- cycle time period.
  • the relay 19 is actuated to a conducting condition. Energising power for the relay coil is derived from the capacitors C 2 and C . Thereafter, with the voltage rise that occurs over an initial period in the first and each subsequent positive half-cycle of the supply, the drain voltage at the MOSFET device 20 will cause current flow through the diode D4 to charge the capacitor C 3 and through diode D5 to replenish the charge at capacitor C 2 .
  • the latch reset U1B senses the voltage rise and functions to reset the latch U1A to an OFF condition, this in turn resulting in the MOSFET being gated OFF for an initial period of time as determined by the charging time of capacitor C 3 .
  • Charge replenishment of the first energy storage device 21 and charging of the second energy storage device 23 is effected during a minimum interval (say, 0.5 to 1.5 mS) of each positive half-cycle of the supply.
  • the switching circuit may be employed with lamps (or other loads) having a wide operating power range.
  • the circuit will operate in the manner as above described and current will flow through both the relay 19 and the MOSFET 20.
  • the load current is very small, a low voltage drop will appear across the resistor R4, the latch Ul A will not be operated and the load current will flow through the resistor R4, rather than through the MOSFET, during each positive half-cycle of the supply.
  • the current will flow through the MOSFET, utilising the intrinsic reverse diode characteristic of MOSFET devices.
  • the device may be adapted to accommodate a load current range of between 20 mA to 16 A, i.e. over nearly three orders of magnitude.

Landscapes

  • Electronic Switches (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un circuit de commutation facilitant la commande d'un dispositif de commutation du type relais, dans un circuit à deux fils qui permet uniquement l'accès à un conducteur actif. Le circuit de commutation (10) comporte un dispositif de commutation électrique (19) pouvant être relié en série avec une charge sous forme de lampe (11), dans un circuit à courant alternatif à phase unique (18). Un second dispositif de commutation transistorisé (20) est relié en série avec le premier (19). Un premier dispositif de stockage d'énergie (21) est couplé aux bornes des deux dispositifs de commutation, pouvant fonctionner sous commande pour alimenter un élément d'activation (22) du premier dispositif de commutation (19). Par ailleurs, un second dispositif de stockage d'énergie (23) est couplé aux bornes du second dispositif de commutation (20), alimentant la commande par porte du second dispositif de commutation. Des circuit de commande par porte (24) associés au second dispositif de stockage d'énergie (23) assurent la commande par porte périodique MARCHE-ARRET du second dispositif de commutation (20), durant la période de passage du premier dispositif de commutation (19) à l'état conducteur. Des connexions de circuit (25 and 26) sont établies avec les premier et second dispositifs de stockage d'énergie (21 and 23) depuis la jonction (27) des premier et second dispositifs de commutation (19 and 20), ces connexions assurant la recharge du premier dispositif de stockage d'énergie (21) et la charge du second dispositif de stockage d'énergie (23) pendant les périodes de commande par porte ARRET du second dispositif de commutation (20).
EP01983290A 2000-11-23 2001-11-09 Commutation sous commande en mode a deux fils Withdrawn EP1350322A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPR163500 2000-11-23
AUPR1635A AUPR163500A0 (en) 2000-11-23 2000-11-23 Two-wire controlled switching
PCT/AU2001/001451 WO2002043244A1 (fr) 2000-11-23 2001-11-09 Commutation sous commande en mode a deux fils

Publications (2)

Publication Number Publication Date
EP1350322A1 true EP1350322A1 (fr) 2003-10-08
EP1350322A4 EP1350322A4 (fr) 2005-02-09

Family

ID=3825675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01983290A Withdrawn EP1350322A4 (fr) 2000-11-23 2001-11-09 Commutation sous commande en mode a deux fils

Country Status (6)

Country Link
EP (1) EP1350322A4 (fr)
CN (1) CN1214527C (fr)
AU (2) AUPR163500A0 (fr)
CA (1) CA2429565A1 (fr)
NZ (1) NZ525729A (fr)
WO (1) WO2002043244A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4729617B2 (ja) * 2005-06-30 2011-07-20 ルートロン エレクトロニクス カンパニー インコーポレイテッド マイクロプロセッサで制御された電源を有する調光器
US8004122B2 (en) 2008-08-13 2011-08-23 Zarlink Semiconductor (U.S.) Inc. Bootstrap supply for switched mode power converter
US8680783B2 (en) 2011-08-10 2014-03-25 Cree, Inc. Bias voltage generation using a load in series with a switch
US8981673B2 (en) 2012-03-12 2015-03-17 Cree, Inc. Power supply that maintains auxiliary bias within target range

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4274045A (en) * 1979-04-09 1981-06-16 Richard Goldstein Power supply and control circuit for series connected controller
GB2213659A (en) * 1987-12-12 1989-08-16 Insta Elektro Gmbh & Co Kg Brightness control circuit for incandescent lamps
US4878010A (en) * 1987-12-10 1989-10-31 Weber Harold J Electric a.c power switch controller and d.c. power supply method and apparatus
EP0794608A2 (fr) * 1996-03-05 1997-09-10 Molex Incorporated Alimentation de puissance cyclique
GB2330704A (en) * 1997-10-21 1999-04-28 Timeguard Limited Semiconductor AC switch units
DE19807517A1 (de) * 1998-02-21 1999-08-26 Insta Elektro Gmbh & Co Kg 2-Drahtschalter
AU2242999A (en) * 1998-04-16 1999-10-28 H.P.M. Industries Pty Limited Controlled switching circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60117518A (ja) * 1983-11-28 1985-06-25 オムロン株式会社 リレ−装置
US5038081A (en) * 1987-12-16 1991-08-06 Lutron Electronics Co., Inc. Reverse phase-controlled dimmer
JP2780566B2 (ja) * 1992-06-10 1998-07-30 株式会社日立製作所 電力変換器
AU757994B2 (en) * 1999-03-25 2003-03-13 H.P.M. Industries Pty Limited Control circuit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4274045A (en) * 1979-04-09 1981-06-16 Richard Goldstein Power supply and control circuit for series connected controller
US4878010A (en) * 1987-12-10 1989-10-31 Weber Harold J Electric a.c power switch controller and d.c. power supply method and apparatus
GB2213659A (en) * 1987-12-12 1989-08-16 Insta Elektro Gmbh & Co Kg Brightness control circuit for incandescent lamps
EP0794608A2 (fr) * 1996-03-05 1997-09-10 Molex Incorporated Alimentation de puissance cyclique
GB2330704A (en) * 1997-10-21 1999-04-28 Timeguard Limited Semiconductor AC switch units
DE19807517A1 (de) * 1998-02-21 1999-08-26 Insta Elektro Gmbh & Co Kg 2-Drahtschalter
AU2242999A (en) * 1998-04-16 1999-10-28 H.P.M. Industries Pty Limited Controlled switching circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0243244A1 *

Also Published As

Publication number Publication date
NZ525729A (en) 2003-08-29
EP1350322A4 (fr) 2005-02-09
CN1214527C (zh) 2005-08-10
AU1480302A (en) 2002-06-03
CN1476671A (zh) 2004-02-18
AUPR163500A0 (en) 2000-12-14
CA2429565A1 (fr) 2002-05-30
WO2002043244A1 (fr) 2002-05-30

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