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WO2015081367A1 - Arrangement gradateur à commande par flanc arrière à deux fils et procédé de commande de sa gradation - Google Patents

Arrangement gradateur à commande par flanc arrière à deux fils et procédé de commande de sa gradation Download PDF

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Publication number
WO2015081367A1
WO2015081367A1 PCT/AU2014/001052 AU2014001052W WO2015081367A1 WO 2015081367 A1 WO2015081367 A1 WO 2015081367A1 AU 2014001052 W AU2014001052 W AU 2014001052W WO 2015081367 A1 WO2015081367 A1 WO 2015081367A1
Authority
WO
WIPO (PCT)
Prior art keywords
comparator
trailing edge
load
arrangement
edge dimmer
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.)
Ceased
Application number
PCT/AU2014/001052
Other languages
English (en)
Inventor
Philip Tracy
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.)
Hendon Semiconductors Pty Ltd
Original Assignee
Hendon Semiconductors 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
Priority claimed from AU2013904677A external-priority patent/AU2013904677A0/en
Application filed by Hendon Semiconductors Pty Ltd filed Critical Hendon Semiconductors Pty Ltd
Publication of WO2015081367A1 publication Critical patent/WO2015081367A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • H05B39/044—Controlling the light-intensity of the source continuously
    • H05B39/048—Controlling the light-intensity of the source continuously with reverse phase control
    • 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 a two-wire trailing edge dimmer arrangement and more particularly to a method of controlling the operation and dimming of such two- wire trailing edge dimmers so as to moderate, eliminate and/or substantially ameliorate the effects of ripple injection and/or superimposi g of supply authority ripple control signals upon the AC voltage mains supply which the dimmer
  • Phase-cut dimmers operate by switching AC mains supply to the lamp or light ioad for only a chosen time portion of each AC mains supply half cycle. For the most part the objective is to maintain that timing as accurately and as stable as possible.
  • the time period for which AC mains supply is applied to the load is determined by an analogue or digital timer, controlling the load switching device, that must be started and stopped at exact times during each AC mains supply half cycle.
  • Two-wire trailing edge dimmers also referred to as reverse phase control dimmers remove power from the end or trailing edge of each AC mains supply cycle. These two terminal dimmers have replaced the conventional single pole light switches and for the most part are wired in series with the load and the time at which the timer is started and stopped, once again for the most part is derived by
  • the instant at which the dimmer terminal voltage falls to zero volts is used as the reference instant that stops and starts the timer wherein power is removed from the load.
  • the addition of AC voltages to the AC mains supply frequencies, that allow supply authorities to remotely switch equipment can cause variations in the instant at which the dimmer's terminal voltage will cross any particular voltage !eve!, including zero volts. Consequently that in turn causes variations in the time that the dimmer applies the mains AC supply to the lamp or light load and results in modulation of the power delivered to the lamp or light and hence causes flickering and/or changes in lamp brightness.
  • dimmers may introduce low-pass filtering of the dimmer's voltage into the controi circuitry in order to remove this unwanted injected ripple frequency interference.
  • a method for controlling dimming of a two-wire trailing edge dimmer arrangement to minimise the effects of ripple injection or superimposing of supply authority ripple control signals upon AC voltage mains supply received by the two-wire trailing edge dimmer arrangement when controlling luminosity to a load under the control of the two-wire trailing edge dimmer arrangement, said method including at least a step of:
  • initialisation and/or timing at which said stable timing reference signal is generatable is variable by a switch detection level of a comparator monitoring amplitude of a scaled, low pass filtered, replica of an active terminal and a load terminal voltages of said two-wire trailing edge dimmer arrangement.
  • the switch detection level of the comparator monitoring amplitude of the scaled, low pass filtered, replica of the active terminal and the load terminal voltages of said two-wire trailing edge dimmer arrangement includes at least one resistive attenuator in an input signal path to the comparator.
  • resistive attenuator attenuation is switchabie by a microcontroller port line or other electronic switch.
  • the switch detection level of the comparator monitoring amplitude of the scaled, low-pass filtered, replica of the active terminal and the load terminal voltages of the two-wire trailing edge dimmer arrangement includes a switchabie input DC lakeage reference amplitude to the comparator.
  • the switchabie input DC voltage reference amplitude to the comparator is by switched attenuation in a reference voltage path into the
  • the switchabie input DC voltage reference amplitude to the comparator is switchabie by applying switched voltage reference sources.
  • the switched voltage reference sources are controlled, applied and/or made available by a microcontroller.
  • this invention provides for a method that is able to utilise the basic circuit structure of a conventional low-pass filtering of the dimmer terminal voltage but instead of generating a timing signal based on the crossing of some singleisage reference level by the filteredireage, the timing signal is based upon the crossing of two or more reference voltage levels which for the most part offer essentially simultaneous adjustment of the dimmer's phase control timer.
  • the ability to adapt to the changing requirements of the timing signai as the dtmmer's brightness is varied provides adequate reduction in the effects of interfering ripple tones without the use of having to introduce the complications associated with additional timers and/or complex filtering means to regenerate a stable equivalent in time to the instant at which the AC mains supply frequency component of the terminal voltage, in the absence of the ripple tones, would cross zero voltage as is the case currently in the prior art.
  • This unique invention relies on the introduction of the capability to dynamically change the detection voltage level utilised in order to provide a timing system with the benefits of retaining simplicity while allowing the dimmer's control to cope with a wide variation in dimmer terminal voltages and wave forms that become increasingly important for the control of non-linear lighting loads suc as LED and compact fluorescent lamps.
  • the load control arrangement for turning off electrical power to the load includes a control switch with back-to-back Field Effect Transistors.
  • the back-to-back Field Effect Transistors are N-Channel enhancement mode MOSFETs with source terminals connected together with gates connected together and the drain terminals acting as two power terminals.
  • each Field Effect Transistor has an intrinsic body diode so as to allow conduction of current through the dimmer in one direction.
  • the active terminal and load terminal voltages are each bridge rectified by a corresponding diode.
  • the resistive attenuator in the input signai path to the comparator is connected to a positive input terminal of the comparator and the switchable reference voltage is connected to a negative input of the comparator.
  • the switchable reference voltage input to the comparator is between 1.8 V to 5.0 V when detection has the dimmer at or towards the dimmest.
  • the reference voltage input to the comparator is between 0.8 V to 1.7V when detection has the dimmer at or towards the brightest.
  • the reference voltage input to the comparator is about 2.4V when detection has the dimmer at or towards the dimmest.
  • the reference voltage input to the comparator is about 1.2V when detection has the dimmer at or towards the brightest.
  • Figure 1 illustrates an electrical circuit and part block diagram of two-wire trailing edge dimmer in a preferred embodiment of the invention.
  • Figure 1 illustrates the use of a typical low-pass filter and detector
  • the dimmer terminal voltage is effectively bridged by rectified diodes (16) and (18) and the parasitic diodes (20), (22) are contained in the Field Effect Transistors (FETs) (24), (26) that comprise the load current switch.
  • FETs Field Effect Transistors
  • As illustrated FETs (24) and (26) are arranged back to back and operate in the N-Channel enhancement mode having source terminals connected together with the gates also connected and the drain terminals acting as two power terminals.
  • the conventional dimmer circuit just described is modified by the further inclusion of the variable attenuator consisting of resistors (36) and (34) as well as switch (38) so as to avoid the situation in a conventional dimmer where in practice the large range of voltage appearing across the dimmers terminal as the "closed" time is varied, to vary the lamp's brightness, means that the voltage of the comparator input may either remain always greater than the reference voltage or always smaller than it.
  • variable attenuator consisting of resistors (34) and (36) and switch SI is preferred as the comparator can use a very stable band-gap reference, at
  • a microcontroller that also preferabiy can include the switch (38) that is capable of operating on a supply voltage of 3,3V or less to minimise power consumption.
  • timing reference pulse (50) which wilf start the timer of Gate ON period is input into microcontroller (52) which provides the switch control signal (54) in this instance which is inputted into a signal amplifier (56) with a lakeage range of 3.3V to 10 V onto power FETs (24) and (26).

Landscapes

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

Abstract

L'invention concerne un procédé de commande de la gradation d'un arrangement gradateur par flanc arrière à deux fils visant à réduire les effets de l'injection d'une ondulation ou de superposition de signaux de commande d'ondulation du réseau d'alimentation sur le réseau de distribution de tension CA reçue par l'arrangement gradateur par flanc arrière à deux fils lors de la commande de la luminosité à une charge commandée. Le procédé comprend l'étape de génération d'un signal de référence de synchronisation stable pour commander une période ARRÊT d'un arrangement de commande de charge, ledit arrangement de commande de charge étant adapté pour déconnecter l'alimentation électrique d'une charge commandée par un arrangement gradateur par flanc arrière à deux fils sur un flanc arrière d'un signal d'entrée d'alimentation du réseau de distribution CA, l'initialisation et/ou la synchronisation à laquelle ledit signal de référence de synchronisation stable peut être généré étant variable par un niveau de détection de commutation d'une amplitude de surveillance de comparateur d'une réplique à l'échelle avec filtrage passe-bas des tensions d'une borne active et d'une borne de charge dudit arrangement gradateur par flanc arrière à deux fils.
PCT/AU2014/001052 2013-12-03 2014-11-19 Arrangement gradateur à commande par flanc arrière à deux fils et procédé de commande de sa gradation Ceased WO2015081367A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2013904677 2013-12-03
AU2013904677A AU2013904677A0 (en) 2013-12-03 A two-wire trailing edge control dimmer and a method for control dimming thereof

Publications (1)

Publication Number Publication Date
WO2015081367A1 true WO2015081367A1 (fr) 2015-06-11

Family

ID=53272631

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2014/001052 Ceased WO2015081367A1 (fr) 2013-12-03 2014-11-19 Arrangement gradateur à commande par flanc arrière à deux fils et procédé de commande de sa gradation

Country Status (1)

Country Link
WO (1) WO2015081367A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017063022A1 (fr) * 2015-10-15 2017-04-20 Hendon Semiconductors Pty Ltd Procédé et montage pour commander la gradation d'une lampe par un système gradateur affecté par des signaux d'injection d'ondulation et/ou de commande d'ondulation d'autorité d'alimentation superposés au signal d'onde d'entrée d'alimentation secteur en courant alternatif
WO2023272349A1 (fr) * 2021-07-02 2023-01-05 Hendon Semiconductors Pty Ltd Agencement de circuit gradateur à bord de fuite à deux fils

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7339331B2 (en) * 2002-03-25 2008-03-04 Clipsal Intergrated Systems Pty Ltd Dimmer circuit with improved ripple control
EP2542034A1 (fr) * 2011-06-24 2013-01-02 Abb Ag Circuit d'atténuation pour le procédé d'entrée des phases

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7339331B2 (en) * 2002-03-25 2008-03-04 Clipsal Intergrated Systems Pty Ltd Dimmer circuit with improved ripple control
EP2542034A1 (fr) * 2011-06-24 2013-01-02 Abb Ag Circuit d'atténuation pour le procédé d'entrée des phases

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017063022A1 (fr) * 2015-10-15 2017-04-20 Hendon Semiconductors Pty Ltd Procédé et montage pour commander la gradation d'une lampe par un système gradateur affecté par des signaux d'injection d'ondulation et/ou de commande d'ondulation d'autorité d'alimentation superposés au signal d'onde d'entrée d'alimentation secteur en courant alternatif
AU2016340016B2 (en) * 2015-10-15 2021-01-07 Hendon Semiconductors Pty Ltd A method and arrangement for controlling dimming to a lamp by a dimmer arrangement affected by ripple injection and/or superimposed supply authority ripple control signals upon the AC mains supply input wave signal
WO2023272349A1 (fr) * 2021-07-02 2023-01-05 Hendon Semiconductors Pty Ltd Agencement de circuit gradateur à bord de fuite à deux fils

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