EP2204078A1 - Appareil électronique de pré-commutation pour lampe à décharge - Google Patents

Appareil électronique de pré-commutation pour lampe à décharge

Info

Publication number
EP2204078A1
EP2204078A1 EP07821915A EP07821915A EP2204078A1 EP 2204078 A1 EP2204078 A1 EP 2204078A1 EP 07821915 A EP07821915 A EP 07821915A EP 07821915 A EP07821915 A EP 07821915A EP 2204078 A1 EP2204078 A1 EP 2204078A1
Authority
EP
European Patent Office
Prior art keywords
switch
control
electronic ballast
discharge lamp
control input
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Withdrawn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
EP07821915A
Other languages
German (de)
English (en)
Inventor
Thomas Pollischansky
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.)
Osram GmbH
Original Assignee
Osram GmbH
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 Osram GmbH filed Critical Osram GmbH
Publication of EP2204078A1 publication Critical patent/EP2204078A1/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Withdrawn legal-status Critical Current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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation

Definitions

  • the invention relates to an electronic ballast for a discharge lamp according to the preamble of claim 1.
  • electronic ballasts in a variety of complexity levels. Frequently, electronic ballasts have a microcontroller. In such electronic ballasts, configurations are known which enable dimming of the discharge lamp. The dimming function is controlled by a two-core control cable and a dimming potentiometer. Instead of a microcontroller, electronic ballasts may also include a control ASIC (application specific integrated circuit, application-specific integrated circuit). Such electronic ballasts are less complex. So far, no electronic ballasts for discharge lamps with control Asic are known in which the dimming of the discharge lamp is controlled differently than via a complex circuit with dimming potentiometer.
  • ASIC application specific integrated circuit, application-specific integrated circuit
  • the object of the present invention is to provide an electronic ballast for a discharge lamp according to the preamble of claim 1, which allows dimming the discharge lamp with a compact and inexpensive construction, so as to be able to save energy if necessary.
  • the electronic ballast is connected via a single-pole connection with a switch whose different switching positions different potentials are determined, which rest on a specific control input of the control Asics.
  • This control input is characterized by the fact that the potential applied to it determines the operating frequency of the control Asics when controlling the discharge lamp, ie the operating frequency over which the power is defined during operation (after the switch-on phase). It is thus determined via the switch, the operating frequency of the control Asics.
  • the operating frequency itself determines the supply of energy to the discharge lamp. Different operating frequencies correspond to different emission powers of the discharge lamp. In other words, the discharge lamp is dimmed in the one state from the other state.
  • the switch connects or disconnects a power supply (preferably a single-wire line) coupled to the control input of the control Asics.
  • a power supply preferably a single-wire line
  • the switch works so binary.
  • This embodiment is particularly inexpensive and compact to provide because of their simplicity.
  • This As- pekt of the invention is based on the recognition that an advantage of dimming that energy is saved, even if there is only a single dimming power level. For example, in the dimmed state, 50% of the light energy can be emitted by the light output in the non-dimmed state.
  • the electronic ballast comprises a transistor whose control input is connectable via the switch to the mains connection.
  • the binary version is thus easily implemented with a transistor, so a particularly easily available and inexpensive component.
  • the transistor can then influence a circuit which determines the potential at the control input of the control Asics.
  • a particularly inexpensive design of the circuit to be executed is one in which the transistor switches a resistor from the control input of the control Asics to ground, in particular to another resistor in parallel. A current or potential in the circuit changes through the resistor and is just fed to the control input of the control Asics.
  • Discharge lamps are usually preheated at a frequency of around 110 kHz, ignited at a frequency around 75 kHz, and then operated at a frequency of between 40 and 50 kHz when full power is to be radiated.
  • a frequency that is between the preheat and the ignition frequency z. B. 85 kHz. It can come with a control Asic of the type used in the electronic ballast according to the invention, that when the power supply sets the operating frequency at 85 kHz, after preheating the firing frequency of 75 kHz is not reached, but the frequency stops when it goes down from 110 kHz at 85 kHz.
  • a terminal of the control Asics which can be seen on the one hand as an input, on the other hand as an output, which is in the turn-on of the discharge lamp at a different potential than after the switch-on.
  • an output can also be used which serves to drive a preheating transformer.
  • This terminal of the control Asics is coupled to the control input of a transistor, and its drain output is then coupled to the control input of the first transistor. In the switch-on phase, therefore, the further transistor is switched, and the potential at the control input of the former transistor remains at zero, so that in the switch-on phase the situation is prolonged that the mains connection is switched off.
  • the switching of the further transistor After completion of the switch-on the switching of the further transistor is terminated, it can form the network potential at the control input of the former transistor, and a corresponding potential is then applied to the control input of the control Asics, on the operating frequency of the control Asics (after the switch-on phase). This ensures that the discharge lamp, if it is to be dimmed immediately after being switched on, reliably switched on, ie preheated and ignited. Short description of the drawing (s)
  • FIGURE shows a circuit diagram of that part of the components of the electronic ballast according to the invention, which is essential for the elucidation of the invention.
  • the control Asic ICB1FL02G from Infineon is used to drive discharge lamps.
  • the control Asic has an input "RFRUN", which is used to determine the operating frequency of the control Asics, ie the frequency at which the discharge lamp is applied, in particular after the discharge lamp has passed through a pre-heating and ignition switch-on phase
  • the operating frequency is determined via the potential applied to the "RFRUN” or the current resulting from the connected resistor. This voltage drops at a resistor R5 with 11 k ⁇ . Connected in parallel with the resistor R5 is a 13 k ⁇ resistor R4 in series with a transistor Q1.
  • the resistor R4 can be connected in parallel via the transistor Q1 and switched off.
  • the potential at the control input "RFRUN” can thus be influenced via the transistor Q.
  • the electronic ballast is then used to connect a simple switch (for example toggle switch), by means of which the transistor Q1 can be acted upon by a control potential
  • the figure does not show an input L2 of the electronic ballast switching arrangement. device with a network potential. Via a resistor R2 of 1 M ⁇ and a diode Dl and a resistor R3 of 10 k ⁇ , the input L2 is connected to the control input of the transistor Ql. Between resistor R2 and diode Dl, a Zener diode D2 can be switched in the reverse direction to ground in order to derive interference pulses from the network. Between diode Dl and resistor R3, a resistance Rl of 20 k ⁇ and a capacitance C1 of 1 M ⁇ are connected in parallel to each other on the one hand.
  • the transistor Q1 turns off, and the voltage applied between RFRUN and GND is determined solely by R5.
  • the electronic ballast When the electronic ballast is equipped with components having the characteristics shown in the figure, after the electronic ballast has been switched on, the latter first undergoes a preheating phase in which the discharge lamp is subjected to a frequency of 110 kHz. With a target of minimally 3.3 J and at most 5.7 J, a preheat energy is actually achieved at a preheat time of 1 s, which is 3.8 J. After preheating, the frequency goes down to 75 kHz and ignition is initiated. The ignition time is 22 ms and the ignition voltage 900 Vrms.
  • the control Asic operates at a frequency of operation of 43 kHz to give maximum light output.
  • the mains power is 60.7 W, the lamp voltage 122 V, the lamp current 457 mA and the lamp power 55.6 W. With losses of 5.1 W, an efficiency of 92%.
  • the switch not shown in the figure is switched on, so that the mains voltage is applied to the input L2.
  • the transistor Q1 turns on, and the voltage applied between the input RFRUN and GND is determined by the parallel connection of R5 and R4.
  • the operating frequency increases again to 85 kHz to deliver about half of the maximum power.
  • the mains power is 36.5 W, the lamp voltage 167 V, the lamp current 177 mA and the lamp power 29.4 W. At losses of 7.1 W, one obtains an efficiency of 81%. It is now also provided in the switching arrangement of the electronic ballast an additional circuit through which the switch-on is possible if the mains voltage is applied to the input L2 before switching.
  • the network potential at input L2 causes the operating frequency to be set to 85 kHz. After preheating with 110 kHz, the frequency would thus not be able to run down to the ignition frequency of 75 kHz.
  • a circuit is provided which delays the switching-on of the transistor Q 1 until a time after completion of the switch-on phase, that is to say the preheating and the ignition.
  • a MOSFET M1 is provided whose drain output is coupled to a point between the diode D1 and the resistor R3.
  • the gate input of the MOSFET is connected through a resistor R8 of 2.2 M to a voltage output VCC of the control Asics.
  • the control input of the MOSFET Ml is connected via a capacitor C2 with a capacitance of 10 nF to the terminal GND, and in addition the control input of the MOSFET is connected via a resistor R7 of 100 k ⁇ to a connection "RFPH" of the control Asics. which in turn is connected via a resistor R6 of 11 k ⁇ to the terminal "GND".
  • the terminal GND is additionally connected to the source terminal of the MOSFET M1. pelt.
  • the terminal "RFPH" of the control Asics is a terminal to which a predetermined potential is applied during the switch-on phase, ie preheating and ignition, which changes after the switch-on phase
  • the turn-on of the MOSFET M1 is terminated, and the potential determined by the input L2 may be established at the point between D1 and R3 If the mains potential is already present at the input L2 when the discharge lamp is switched on, the preheating with a frequency of 110 kHz is then carried out as desired, then the ignition with a frequency of 75 kHz, and then the operating frequency rises again to 85 kHz to achieve the dimming operation.
  • the electronic ballast In the case of the electronic ballast according to the invention, only a distinction is made between two operating states, namely the output of a full power with an operating frequency of 43 kHz and the output of a 50% power at an operating frequency of 85 kHz. Between these states is changed by operating the switch which causes or terminates the application of the mains potential at the input L2.
  • the switching arrangement is particularly simple and inexpensive. Unlike more complex electronic ballasts, it is not possible to set any dimming power. However, the fact that it is possible to switch between a radiation of maximum energy and a radiation of 50% of the energy makes it possible to use an energy-saving mode. This is sufficient for most energy saving purposes.
  • dimming ballasts are connected via their own 2-core control cable and a dimming potentiometer.
  • electronic ballast according to the invention only an additional wire of the power cord must be connected. This is connected to any mains phase or the neutral via a power switch (toggle switch). If the dimming input L2 is not connected, maximum power is always output.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

L'invention propose un appareil électronique de pré-commutation qui présente un ASIC de commande et qui permet d'atténuer la puissance d'une lampe à décharge. Un commutateur branche ou débranche un raccordement au réseau qui commande un transistor qui branche ou débranche une résistance, de sorte que le potentiel se modifie sur une entrée de commande de l'ASIC de commande.
EP07821915A 2007-10-26 2007-10-26 Appareil électronique de pré-commutation pour lampe à décharge Withdrawn EP2204078A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/061555 WO2009052868A1 (fr) 2007-10-26 2007-10-26 Appareil électronique de pré-commutation pour lampe à décharge

Publications (1)

Publication Number Publication Date
EP2204078A1 true EP2204078A1 (fr) 2010-07-07

Family

ID=39639133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07821915A Withdrawn EP2204078A1 (fr) 2007-10-26 2007-10-26 Appareil électronique de pré-commutation pour lampe à décharge

Country Status (4)

Country Link
US (1) US8461771B2 (fr)
EP (1) EP2204078A1 (fr)
CN (1) CN101836508B (fr)
WO (1) WO2009052868A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632282A1 (de) * 1996-08-09 1998-02-19 Holzer Walter Prof Dr H C Ing Verfahren und Einrichtung zur Helligkeitssteuerung von Leuchtstofflampen
WO1998039951A1 (fr) * 1997-03-04 1998-09-11 Tridonic Bauelemente Gmbh Ballast electronique

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB953914A (en) 1959-09-18 1964-04-02 English Electric Co Ltd Improvements relating to apparatus for supplying a d.c. load from an a.c. source
GB1349751A (en) 1970-03-05 1974-04-10 Dexter K R Control device for an electrical circuit
FI74828C (fi) 1986-09-02 1988-03-10 Helvar Oy Styrbussledning foer reglerbar elanordning.
US5138137A (en) 1990-12-27 1992-08-11 Whirlpool Corporation Fault detecting membrane potentiometer switch
US5615093A (en) 1994-08-05 1997-03-25 Linfinity Microelectronics Current synchronous zero voltage switching resonant topology
US5703439A (en) 1996-05-10 1997-12-30 General Electric Company Lamp power supply circuit with electronic feedback circuit for switch control
US5798620A (en) * 1996-12-17 1998-08-25 Philips Electronics North America Corporation Fluorescent lamp dimming
US6798777B1 (en) 2000-04-17 2004-09-28 Juniper Networks, Inc. Filtering and route lookup in a switching device
US7408307B2 (en) 2004-02-19 2008-08-05 International Rectifier Corporation Ballast dimming control IC
US7235958B2 (en) * 2005-05-18 2007-06-26 Texas Instruments Incorporated Apparatus and method to synchronize switching frequencies of multiple power regulators
EP1935217A4 (fr) 2005-10-12 2009-11-04 Int Rectifier Corp Circuit integre de commande de ballast a intensite reglable

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19632282A1 (de) * 1996-08-09 1998-02-19 Holzer Walter Prof Dr H C Ing Verfahren und Einrichtung zur Helligkeitssteuerung von Leuchtstofflampen
WO1998039951A1 (fr) * 1997-03-04 1998-09-11 Tridonic Bauelemente Gmbh Ballast electronique

Also Published As

Publication number Publication date
US8461771B2 (en) 2013-06-11
WO2009052868A1 (fr) 2009-04-30
US20100308741A1 (en) 2010-12-09
CN101836508B (zh) 2014-03-12
CN101836508A (zh) 2010-09-15

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