EP0463387B1 - Alimentation pour un dispositif de préchauffage d'un afficheur, en particulier d'un afficheur fluorescent - Google Patents

Alimentation pour un dispositif de préchauffage d'un afficheur, en particulier d'un afficheur fluorescent Download PDF

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Publication number
EP0463387B1
EP0463387B1 EP91108630A EP91108630A EP0463387B1 EP 0463387 B1 EP0463387 B1 EP 0463387B1 EP 91108630 A EP91108630 A EP 91108630A EP 91108630 A EP91108630 A EP 91108630A EP 0463387 B1 EP0463387 B1 EP 0463387B1
Authority
EP
European Patent Office
Prior art keywords
display
voltage
power supply
heating
supply unit
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.)
Expired - Lifetime
Application number
EP91108630A
Other languages
German (de)
English (en)
Other versions
EP0463387A2 (fr
EP0463387A3 (en
Inventor
Klaus Anders
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.)
Eaton GmbH
Original Assignee
Eaton GmbH
Eaton GmbH and Co KG
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 Eaton GmbH, Eaton GmbH and Co KG filed Critical Eaton GmbH
Publication of EP0463387A2 publication Critical patent/EP0463387A2/fr
Publication of EP0463387A3 publication Critical patent/EP0463387A3/de
Application granted granted Critical
Publication of EP0463387B1 publication Critical patent/EP0463387B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/23—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode
    • H05B41/232—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps
    • H05B41/2325—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps not having an auxiliary starting electrode for low-pressure lamps provided with pre-heating electrodes
    • 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

Definitions

  • the invention relates to a power supply device for the heating device of a heated display, in particular a fluorescent display, according to the preamble of claim 1.
  • the directly heated cathodes of fluorescent displays or fluorescent displays require a typical heating voltage of approx. 3 volts with a current of 70 to 120 mA depending on the number of filaments.
  • the heating voltage is generated by clocking a further voltage source with a higher voltage, but the cathode is heated at times when there is no display voltage. In addition to the If two separate voltage sources are required, continuous cathode heating is not possible.
  • this current is made available directly from the 220 V network, with ohmic resistors being connected in series as ballast elements for current limitation.
  • An object of the present invention is to provide a power supply device for the heating device of a heated display according to the type mentioned at the outset, which significantly reduces the power loss at low cost and small size.
  • the heating current reduced by a factor of 8 for a clocked 24 V DC voltage results in a capacitor of only approx. 0.18 MF instead of 1.5 MF for a ballast or a power loss of only approx. 2 for the ohmic resistor , 5 W instead of approx. 20 W.
  • the clock device expediently has a clock frequency generator, the output signals of which have a pulse duty factor corresponding to the required heating power with regard to the voltage of the display control pulses. This enables simple adaptation to the required heating current when the display voltage is available.
  • the heating device can be acted upon directly by the output signals of the clock frequency generator if its output power is sufficient; on the other hand, the control input of a semiconductor switch can also be acted upon by the output signals of the clock generator, the switching path of the semiconductor switch being connected in series to the heating device and to the DC voltage source supplying the voltage for the display control pulses is switched.
  • a clock generator with a very low output power can also be used here.
  • the clock frequency generator can be an astable multivibrator, which can be designed as a separate component or can be contained in an electronic control unit for the display.
  • This electronic control unit can of course also be a other type of clock frequency generator included.
  • the display control pulses of the control unit for the display can also be used to control the semiconductor switch and are preferably applied to the control input of the semiconductor switch via a differentiating element.
  • a separate output of the control unit for the heating can be omitted, and the heating control pulses are derived from the display control pulses which are present anyway, the required heating output being able to be set via the differentiating element.
  • a microprocessor which contains the clock frequency generator also proves to be particularly advantageous. The required clock frequency and the required duty cycle are generated under program control.
  • the control unit containing the clock frequency generator can of course also be designed as a customer-specific, integrated circuit.
  • the power of the clock frequency generator contained can be designed so high that the heating device can be acted upon directly by a corresponding output.
  • display control pulses for a display 10 are generated in a microprocessor 11 (»P) and fed to the display 10 via five control lines 12-16.
  • the term microprocessor is also intended to include, for example, a microcomputer.
  • the microprocessor 10 is fed by a 24 volt DC voltage source, the DC voltage being supplied via two connections 17, 18. A DC voltage of 24 volts is usually required for the display control pulses.
  • the DC voltage present at the connections 17, 18 is applied to the series connection of the switching path of a semiconductor switch 19 with the heating device 20 of the display 10.
  • This heating device usually consists of directly heated cathodes with a certain number of filaments.
  • the output of an astable multivibrator 21 is connected via a resistor 22 to the control input of the semiconductor switch 19.
  • the astable multivibrator 21 is formed by a known circuit which consists of the series connection of two inverters 23, 24 which are fed back via a capacitor 25.
  • the first inverter 23 is additionally fed back via a resistor 26.
  • Another known circuit for an astable multivibrator can of course also be used here.
  • the heating device 20 Since the heating device 20 only requires a heating voltage of approximately 3 V, the DC voltage of 24 V cannot be applied directly.
  • the semiconductor switch 19 is clocked by the astable multivibrator 21, so that clocked voltage pulses are supplied to the heating device 20 for heating it.
  • the pulse duty factor is set so that the required heating output is achieved. It can be seen from the calculation example given at the beginning that the current required is significantly lower than that of a continuous one Voltage application. Ballast resistors or ballast capacitors in a power supply (not shown) for generating the 24 volt DC voltage can therefore be dimensioned relatively small and with low power loss.
  • this circuit only requires a single voltage of 24 V to control the display 10 and to heat it. Depending on the display used, this voltage can of course also take on a different value.
  • the display control pulses of the control line 12 are used to control the semiconductor switch 19, which can be a transistor, for example.
  • these display control pulses are generated at regular intervals, that is to say they have a specific frequency.
  • These display control pulses are differentiated by an RC element 27 connected upstream of the control input of the semiconductor switch 19 as a differentiating element, so that the desired heating power or the desired duty cycle can be set via the semiconductor switch 19.
  • a diode 28 connected in parallel with the base-emitter path serves as a protective diode.
  • the third exemplary embodiment shown in FIG. 3 again corresponds in part to the previous exemplary embodiments, so that the same or equivalent components are again provided with the same reference numerals and are not described again.
  • the clocked control voltage is generated internally in the microprocessor 11 and fed via the resistor 22 to the control input of the semiconductor switch 19.
  • the clocked voltage is generated as a pulse train with a predetermined duty cycle via the program contained in the microprocessor 11.
  • the semiconductor switch 19 is omitted, and instead of the microprocessor, a customer-specific control unit 29 designed as an integrated circuit is provided here.
  • a clock frequency generator contained in this control unit 29 has such a high output power that the heating device 20 is connected directly between the output 30 of this control unit 29 and the connection 18.
  • the clock frequency generator can be an astable multivibrator, for example.
  • the heating device 20 can always be controlled directly when the corresponding one Output power is sufficient. This can also be the case, for example, with a control output of a microprocessor.
  • an external clock frequency generator which is fed by the voltage at the connections 17, 18, acts directly on the heating device.
  • the control transistor 19 can also be contained internally in a microprocessor or a customer-specific circuit. The required clock frequency can be formed in the microprocessor or in a customer-specific circuit by dividers present there.

Landscapes

  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of Resistance Heating (AREA)

Claims (9)

  1. Dispositif d'alimentation en électricité destiné au dispositif de chauffage (20) d'un afficheur (10) chauffé, en particulier d'un afficheur fluorescent, comportant une source de tension continue fournissant la tension requise pour les impulsions d'affichage acheminées vers l'afficheur (10) et une source de courant de chauffage, qui est alimentée par une tension supérieure à la tension de chauffage requise,
       caractérisé en ce que cette tension provenant de la source de tension continue est convertie en tension de chauffage au moyen d'un dispositif rythmeur (19, 21, 11, 29).
  2. Dispositif d'alimentation en électricité selon la revendication 1, caractérisé en ce que le dispositif rythmeur comporte un générateur (21) de fréquences de cycle, dont les signaux de sortie ont une durée de cycle correspondant à la puissance de chauffage requise compte tenu de la tension des impulsions de commande d'affichage.
  3. Dispositif d'alimentation en électricité selon la revendication 2, caractérisé en ce que le dispositif de chauffage (20) reçoit directement les signaux de sortie du générateur de fréquences de cycle.
  4. Dispositif d'alimentation en électricité selon la revendication 2, caractérisé en ce que l'entrée de commande d'un commutateur à semi-conducteur (19) reçoit les signaux de sortie du générateur (21) de fréquences de cycle, la longueur de coupe du commutateur à semiconducteur (19) étant montée en série avec le dispositif de chauffage (20) et la source de tension continue fournissant la tension destinée aux impulsions de commande d'affichage.
  5. Dispositif d'alimentation en électricité selon la revendication 3 ou 4, caractérisé en ce que le générateur (21) de fréquences de cycle est un multivibrateur astable.
  6. Dispositif d'alimentation en électricité selon l'une des revendications 3 à 5, caractérisé en ce que le générateur de fréquences de cycle est logé dans une unité de commande électronique (11, 29) destinée à l'affichage.
  7. Dispositif d'alimentation en électricité selon la revendication 6, caractérisé en ce que les impulsions de commande d'affichage sont émises vers l'entrée de commande du commutateur à semi-conducteur (19), à partir de l'unité de commande (11), de préférence par l'intermédiaire d'un comparateur (27).
  8. Dispositif d'alimentation en électricité selon la revendication 6 ou 7, caractérisé en ce que l'unité de commande (11) comprenant le générateur de fréquences de cycle est conformé en microprocesseur.
  9. Dispositif d'alimentation en électricité selon la revendication 6 ou 7, caractérisé en ce que l'unité de commande (29) comprenant le générateur de fréquences de cycle est conformé comme un circuit électrique spécifique aux besoins de chaque client.
EP91108630A 1990-06-29 1991-05-28 Alimentation pour un dispositif de préchauffage d'un afficheur, en particulier d'un afficheur fluorescent Expired - Lifetime EP0463387B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020731A DE4020731A1 (de) 1990-06-29 1990-06-29 Stromversorgungseinrichtung fuer die heizeinrichtung eines beheizten displays, insbesondere eines fluoreszenz-displays
DE4020731 1990-06-29

Publications (3)

Publication Number Publication Date
EP0463387A2 EP0463387A2 (fr) 1992-01-02
EP0463387A3 EP0463387A3 (en) 1993-01-20
EP0463387B1 true EP0463387B1 (fr) 1995-12-13

Family

ID=6409334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108630A Expired - Lifetime EP0463387B1 (fr) 1990-06-29 1991-05-28 Alimentation pour un dispositif de préchauffage d'un afficheur, en particulier d'un afficheur fluorescent

Country Status (3)

Country Link
EP (1) EP0463387B1 (fr)
AT (1) ATE131682T1 (fr)
DE (2) DE4020731A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7728528B2 (en) 2004-11-29 2010-06-01 Century Concept Ltd Electronic ballast with preheating and dimming control

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4214021A1 (de) * 1992-04-29 1992-09-24 Karl Koehl Anzeigeeinrichtung mit vakuum - fluoreszenzelementen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209729A (en) * 1978-06-21 1980-06-24 Texas Instruments Incorporated On chip vacuum fluorescent display drive
US4158794A (en) * 1978-07-14 1979-06-19 P. R. Mallory & Co. Inc. Drive means and method for vacuum fluorescent display systems
JPS58143386A (ja) * 1982-02-19 1983-08-25 シャープ株式会社 螢光表示管の駆動装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7728528B2 (en) 2004-11-29 2010-06-01 Century Concept Ltd Electronic ballast with preheating and dimming control

Also Published As

Publication number Publication date
ATE131682T1 (de) 1995-12-15
EP0463387A2 (fr) 1992-01-02
DE59107056D1 (de) 1996-01-25
DE4020731A1 (de) 1992-01-02
EP0463387A3 (en) 1993-01-20

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