EP1220581A2 - Dispositif d' alimentation de lampes à décharge à cathodes froides - Google Patents

Dispositif d' alimentation de lampes à décharge à cathodes froides Download PDF

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Publication number
EP1220581A2
EP1220581A2 EP01124310A EP01124310A EP1220581A2 EP 1220581 A2 EP1220581 A2 EP 1220581A2 EP 01124310 A EP01124310 A EP 01124310A EP 01124310 A EP01124310 A EP 01124310A EP 1220581 A2 EP1220581 A2 EP 1220581A2
Authority
EP
European Patent Office
Prior art keywords
power supply
voltage
cold
inverters
lamps
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Withdrawn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
EP01124310A
Other languages
German (de)
English (en)
Other versions
EP1220581A3 (fr
Inventor
Fausto Martin
Andrea Brollo
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.)
SIET Srl
Original Assignee
Setech Srl
SIET Srl
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 Setech Srl, SIET Srl filed Critical Setech Srl
Publication of EP1220581A2 publication Critical patent/EP1220581A2/fr
Publication of EP1220581A3 publication Critical patent/EP1220581A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • H05B41/245—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency for a plurality of lamps

Definitions

  • the present invention relates to a power supply device for cold-cathode discharge lamps, particularly discharge lamps based on noble gases such as argon, krypton, helium, xenon, with the possible addition of mercury vapors.
  • noble gases such as argon, krypton, helium, xenon
  • This type of lamp which can be used for example to produce illuminated signs, billboard advertisements and road signs, requires a high-voltage power supply for its ignition; this fact requires particular measures for insulating the electric circuit.
  • the required power supply voltage can reach almost 10,000 volts in Europe and 15,000 volts in other countries, with a considerable risk of fire and electrocution in case of accidental fault or during maintenance.
  • the EN 50107 standard prescribes the installation of safety modules protecting against any ground discharges and against the opening of the high-voltage circuit.
  • US Patent no. 5,814,938 discloses a power supply for cold-cathode lamps comprising a control device, for modulating the mains current into a high-frequency low-voltage signal, with which a voltage booster is associated, said booster sending the required high-voltage current to the cold-cathode lamp.
  • Said voltage booster is advantageously arranged inside the lamp proper.
  • the control device can have multiple outputs for connecting a corresponding number of voltage boosters, each accommodated within, or proximate to, a respective cold-cathode lamp.
  • the aim of the present invention is therefore to solve the above noted technical problems, eliminating the drawbacks of the cited known art by providing an invention which allows to obtain a power supply device for cold-cathode discharge lamps which operates mainly at low voltage, thus avoiding problems in terms of radio noise, interference and cable hum, and most of all reducing considerably the risks of discharge and consequent fire.
  • an object is to provide an invention which allows to reduce the dimensions of the power supply of each lamp, increasing the pleasantness and aesthetic impact of the installation.
  • Another object is to provide an invention which allows to reduce the number of parts to be manufactured and held in stock, with a consequent great reduction in production and inventory costs.
  • Another object is to provide an invention which is highly flexible and versatile in installation and ensures at the same time considerable ease and speed in producing said installation.
  • Another object is to provide an invention which comprises units which provide for diagnostics, programming and safety of the circuit in a simple and efficient manner.
  • Another object is to provide an invention which is structurally simple and has low manufacturing costs.
  • a power supply device for cold-cathode discharge lamps characterized in that it is constituted by a unit for conversion from alternating-current mains voltage to direct current with voltage reduction, by a distribution unit which supplies power to one or more inverters suitable to convert from low-voltage DC to high-voltage AC one or more cold-cathode discharge lamps, devices being provided for diagnostics, programming, functional testing, any ground leakage, and identification of failure of individual lamp circuits.
  • the numeral 1 designates a power supply device for cold-cathode discharge lamps, particularly for discharge lamps based on noble gases such as argon, krypton, helium, xenon, optionally with the presence of mercury vapors.
  • the power supply device 1 comprises a conversion unit 2, also known as console, which is arranged in a location that can be accessed easily by the user, is appropriately connected to the mains, and is suitable to convert the mains voltage into direct current and lower said voltage.
  • a conversion unit 2 also known as console, which is arranged in a location that can be accessed easily by the user, is appropriately connected to the mains, and is suitable to convert the mains voltage into direct current and lower said voltage.
  • the console 2 is provided with a first main grounding device of a known type, designated by the reference numeral 3 and usually connected to the ground system, and comprises at least one power supply unit 4, which optionally has means for connection to one or more auxiliary batteries, designated by the reference numeral 5, or to other similar power supply units 4.
  • the power supply units 4 are connected to a first control logic module or unit, designated by the reference numeral 6, which is adapted to process and send signals between a user interface 7 and a data transceiver system, also known as Tx/Rx system, designated by the reference numeral 8.
  • the user interface 7 can advantageously have a keypad with buttons for entering data, can optionally have a monitor, for example a liquid-crystal display, also known as LCD, for the onscreen display of data, and optionally a port for connection to an external modem, for example a serial port of the type known as RS232 or RS422 or other devices for interfacing with the user.
  • a monitor for example a liquid-crystal display, also known as LCD
  • a port for connection to an external modem for example a serial port of the type known as RS232 or RS422 or other devices for interfacing with the user.
  • the Tx/Rx system 8 is constituted by two separate units, i.e., a first modulator 8a and a first demodulator 8b, which are respectively connected to a first transmitter or transmission coupling 9a and to a first receiver coupling 9b which are mutually separate; in Figure 2, said couplings have been combined, for the sake of simplicity, into a single block which constitutes a transceiver coupling, designated by the reference numeral 9.
  • the Tx/Rx system 8 preferably has a high impedance at its operating frequency, so that data transmission has a low absorption.
  • a data carrier block designated by the reference numeral 10, is arranged between the power supply unit 4 and the first Tx/Rx coupling 9, and is suitable to filter the input signal, preventing it from entering the power line.
  • said console 2 has a single first cable, designated by the reference numeral 11, which is of the two-pole type or optionally of the single-pole type if the electric ground cable is used for the return.
  • Said first cable 11 is suitable to transmit the low-voltage DC output signal to a distribution unit 12 which is arranged proximate to, or in the vicinity of, one or more cold-cathode lamps 13 (multiple lamps can be arranged in series) and therefore for example, in the case of use as illuminated signs, on the roof of a building or on a terrace.
  • a distribution unit 12 which is arranged proximate to, or in the vicinity of, one or more cold-cathode lamps 13 (multiple lamps can be arranged in series) and therefore for example, in the case of use as illuminated signs, on the roof of a building or on a terrace.
  • the distribution unit shown in detail in Figure 4, has an optional second grounding device, designated by the reference numeral 14, and is substantially constituted by one or more second power supply cables 15, each of which is connected in parallel to the first cable 11 which carries the DC signal.
  • Each one of said second cables 15 supplies an inverter, designated by the reference numeral 16, which is suitable to convert the low-voltage DC input current into a high-voltage AC output current, suitable to supply said cold-cathode lamps 13 (only one whereof is shown schematically in Figure 1).
  • the inverters 16 are preferably of the self-regulating type for all the lamp circuits that require less power than their nominal power, providing them with the exact potential that they require.
  • FIG. 5 illustrates one of said inverters 16, which advantageously comprises a transceiver bus communications module, designated by the reference numeral 17, which is also known as Tx/Rx bus communications module.
  • Said bus communications module 17 is constituted by a second modulator and a second demodulator, designated by the reference numerals 18a and 18b, with which a second Tx coupling 19a and a second Rx coupling 19b are respectively associated.
  • a filter 21 Downstream of said second bus communications module 17 there is a filter 21 which is suitable to eliminate or at least reduce the feedback (harmonic components introduced in the mains or conducted) on the AC line, thus limiting the presence of background noise and other noise, according to EMC directive 89/336 and the standards associated thereto.
  • Said filter 21 is connected to a device for switching the current from AC to DC, which is driven by a circuit which is commonly known as a driver and is designated by the reference numeral 22, in order to send the DC current to a transformer 23, which raises the voltage to the values required by the associated cold-cathode lamp 13.
  • the inverter 16 is further provided with a third grounding device, designated by the reference numeral 24, which is advantageously arranged at entry of the second cable 15 in said inverter 16; conveniently, there is also a fourth grounding device 25 which is connected to the transformer 23.
  • a third grounding device designated by the reference numeral 24, which is advantageously arranged at entry of the second cable 15 in said inverter 16; conveniently, there is also a fourth grounding device 25 which is connected to the transformer 23.
  • Each inverter is further provided with an internal identification number 26, which is stored in the memory of said inverter 16, and with an input/output interface (input/output of data from and to the console 2), designated by the reference numeral 27, so that it is possible to switch on and off each individual lamp 13 in a fully independent manner.
  • the first control logic module 6, the data transceiver system 8, and the first Tx/Rx coupling 9 constitute a set of units or devices, designated by the reference numeral 28, which performs a diagnostic function on the entire power supply device 1, checking the operating status of each power supply unit 4 and of each inverter 16.
  • each one of the inverters 16, which are distinguished from each other by means of the identification numbers 26, is managed on the basis of a continuous and mutual exchange of data, which occurs along said first cable between the I/O interface 27 and the console 2.
  • Said set of units or devices 28 also manages the programming, functional testing, any ground leakages and failure identification of each individual lamp 13.
  • the frequency used as a carrier is preferably chosen very low with respect to the operating frequency of the inverters 16, so as to minimize the electromagnetic emissions and the noise generated by said inverters 16.
  • the user can perform control, programming and diagnostics of the power supply device 1.
  • RS232 serial port or equivalent port it is possible to perform remote control of the power supply device 1 by means of an external computer and to perform remote control of the inverters 16, and perform system diagnostics or specific programming.
  • a power supply device for cold-cathode discharge lamps having been provided which, by operating mainly with a low-voltage direct-current signal, avoids the usual problems of radio noise, interference and cable hum, eliminating almost completely the risks of discharge and consequent fire.
  • the invention further allows to reduce the size of the power supply of each lamp circuit, because it is sufficient to install an inverter locally: this simplifies installation and most of all considerably increases the aesthetic pleasantness of the discharge lamp.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Luminescent Compositions (AREA)
EP01124310A 2000-12-28 2001-10-19 Dispositif d' alimentation de lampes à décharge à cathodes froides Withdrawn EP1220581A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTV20000163 IT1316561B1 (it) 2000-12-28 2000-12-28 Dispositivo di alimentazione di lampade a sarica a catodo freddo.
ITTV000163 2000-12-28

Publications (2)

Publication Number Publication Date
EP1220581A2 true EP1220581A2 (fr) 2002-07-03
EP1220581A3 EP1220581A3 (fr) 2003-09-03

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EP01124310A Withdrawn EP1220581A3 (fr) 2000-12-28 2001-10-19 Dispositif d' alimentation de lampes à décharge à cathodes froides

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EP (1) EP1220581A3 (fr)
IT (1) IT1316561B1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1555861A1 (fr) * 2004-01-14 2005-07-20 TridonicAtco GmbH & Co. KG Commande d' appareils d' éclairage par modulation sur un bus à courant continu
EP1555857A1 (fr) * 2004-01-14 2005-07-20 TridonicAtco GmbH & Co. KG Alimentation centrale utilisant plusieurs circuits à courant continu
EP1555860A1 (fr) * 2004-01-14 2005-07-20 TridonicAtco GmbH & Co. KG Modules d'alimentation à courant continu pour dispositif d'éclairage
KR100753559B1 (ko) 2005-12-02 2007-08-30 엘에스산전 주식회사 키패드와 다수의 인버터와의 통신 방법 및 이를 위한시스템
EP2365737A3 (fr) * 2004-01-14 2013-12-11 Tridonic GmbH & Co KG PFC central doté d'une régulation de sortie CC
DE102004012215B4 (de) * 2004-03-12 2020-03-26 Tridonic Gmbh & Co Kg Ansteuerung von Leuchtmittel-Betriebsgeräten mit einem zentralen kaskadierten AC/DC-Konverter

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3212339A1 (de) * 1982-03-12 1983-09-22 Manfred 4350 Recklinghausen Frankauer Beleuchtungsanlage, insbesondere fuer den einsatz im bergbau untertage
US4630005A (en) * 1982-05-03 1986-12-16 Brigham Young University Electronic inverter, particularly for use as ballast
US4751398A (en) * 1986-03-18 1988-06-14 The Bodine Company Lighting system for normal and emergency operation of high intensity discharge lamps
WO1994027419A1 (fr) * 1993-05-13 1994-11-24 Etta Industries, Inc. Systeme et procede d'alimentation en courant de lampe a decharge
US5420779A (en) * 1993-03-04 1995-05-30 Dell Usa, L.P. Inverter current load detection and disable circuit
US5487088A (en) * 1993-10-28 1996-01-23 Infilco Degremont, Inc. Apparatus for monitoring lamp system status
DE19613263A1 (de) * 1995-04-03 1996-10-10 Solar Wide Ind Ltd Beleuchtungssysteme
US5654609A (en) * 1993-09-02 1997-08-05 Logic Laboratories, Inc. Gas discharge lamp and power distribution system therefor
US5814938A (en) * 1996-08-05 1998-09-29 Transfotec International Cold cathode tube power supply
WO1999012399A1 (fr) * 1997-08-29 1999-03-11 Sparton Corporation Ballast electronique
US5949197A (en) * 1997-06-30 1999-09-07 Everbrite, Inc. Apparatus and method for dimming a gas discharge lamp

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3212339A1 (de) * 1982-03-12 1983-09-22 Manfred 4350 Recklinghausen Frankauer Beleuchtungsanlage, insbesondere fuer den einsatz im bergbau untertage
US4630005A (en) * 1982-05-03 1986-12-16 Brigham Young University Electronic inverter, particularly for use as ballast
US4751398A (en) * 1986-03-18 1988-06-14 The Bodine Company Lighting system for normal and emergency operation of high intensity discharge lamps
US5420779A (en) * 1993-03-04 1995-05-30 Dell Usa, L.P. Inverter current load detection and disable circuit
WO1994027419A1 (fr) * 1993-05-13 1994-11-24 Etta Industries, Inc. Systeme et procede d'alimentation en courant de lampe a decharge
US5654609A (en) * 1993-09-02 1997-08-05 Logic Laboratories, Inc. Gas discharge lamp and power distribution system therefor
US5487088A (en) * 1993-10-28 1996-01-23 Infilco Degremont, Inc. Apparatus for monitoring lamp system status
DE19613263A1 (de) * 1995-04-03 1996-10-10 Solar Wide Ind Ltd Beleuchtungssysteme
US5814938A (en) * 1996-08-05 1998-09-29 Transfotec International Cold cathode tube power supply
US5949197A (en) * 1997-06-30 1999-09-07 Everbrite, Inc. Apparatus and method for dimming a gas discharge lamp
WO1999012399A1 (fr) * 1997-08-29 1999-03-11 Sparton Corporation Ballast electronique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ALONSO J M ET AL: "A MICROCONTROLLER-BASED EMERGENCY BALLAST FOR FLUORESCENT LAMPS" IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, IEEE INC. NEW YORK, US, vol. 44, no. 2, 1 April 1997 (1997-04-01), pages 207-216, XP000656632 ISSN: 0278-0046 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1555861A1 (fr) * 2004-01-14 2005-07-20 TridonicAtco GmbH & Co. KG Commande d' appareils d' éclairage par modulation sur un bus à courant continu
EP1555857A1 (fr) * 2004-01-14 2005-07-20 TridonicAtco GmbH & Co. KG Alimentation centrale utilisant plusieurs circuits à courant continu
EP1555860A1 (fr) * 2004-01-14 2005-07-20 TridonicAtco GmbH & Co. KG Modules d'alimentation à courant continu pour dispositif d'éclairage
EP1947913A1 (fr) * 2004-01-14 2008-07-23 TridonicAtco GmbH & Co. KG Modules de moyens d'entraînement alimentés en courant continu pour moyens d'éclairage
EP2278861A1 (fr) * 2004-01-14 2011-01-26 Tridonic GmbH & Co KG Alimentation centrale utilisant plusieurs circuits à courant continu
EP2365737A3 (fr) * 2004-01-14 2013-12-11 Tridonic GmbH & Co KG PFC central doté d'une régulation de sortie CC
DE102004002017B4 (de) 2004-01-14 2019-12-12 Tridonic Gmbh & Co Kg Steuerung von Betriebsgeräten für Leuchtmittel mittels Schaltmodulation eines DC-Busses
DE102004002027B4 (de) * 2004-01-14 2020-03-26 Tridonic Gmbh & Co Kg Zentraler PFC mit DC-Ausgangskreisregelung
DE102004012215B4 (de) * 2004-03-12 2020-03-26 Tridonic Gmbh & Co Kg Ansteuerung von Leuchtmittel-Betriebsgeräten mit einem zentralen kaskadierten AC/DC-Konverter
KR100753559B1 (ko) 2005-12-02 2007-08-30 엘에스산전 주식회사 키패드와 다수의 인버터와의 통신 방법 및 이를 위한시스템

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Publication number Publication date
IT1316561B1 (it) 2003-04-22
ITTV20000163A1 (it) 2002-06-28
EP1220581A3 (fr) 2003-09-03

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