EP1189487A2 - Circuit électronique pour détecter l'usure des filaments de lampes à décharge - Google Patents

Circuit électronique pour détecter l'usure des filaments de lampes à décharge Download PDF

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Publication number
EP1189487A2
EP1189487A2 EP01118281A EP01118281A EP1189487A2 EP 1189487 A2 EP1189487 A2 EP 1189487A2 EP 01118281 A EP01118281 A EP 01118281A EP 01118281 A EP01118281 A EP 01118281A EP 1189487 A2 EP1189487 A2 EP 1189487A2
Authority
EP
European Patent Office
Prior art keywords
voltage
operating device
capacitor
circuit part
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.)
Granted
Application number
EP01118281A
Other languages
German (de)
English (en)
Other versions
EP1189487A3 (fr
EP1189487B1 (fr
Inventor
Klaus Schadhauser
Harald Schmitt
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
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1189487A2 publication Critical patent/EP1189487A2/fr
Publication of EP1189487A3 publication Critical patent/EP1189487A3/fr
Application granted granted Critical
Publication of EP1189487B1 publication Critical patent/EP1189487B1/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
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/295—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps with preheating electrodes, e.g. for fluorescent lamps
    • H05B41/298—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2981—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
    • H05B41/2985—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against abnormal lamp operating conditions
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/07—Starting and control circuits for gas discharge lamp using transistors

Definitions

  • the invention relates to a circuit arrangement for operating one or several low-pressure discharge lamps according to the preamble of the claim 1. It is in particular a circuit that the Breakage of a filament of a lamp is detected and the circuit arrangement in put in a safe mode.
  • the service life of a low-pressure discharge lamp equipped with filaments is primarily determined by the life of the filaments.
  • the lamp voltage When the coils are used up, there is an increase first the lamp voltage accompanied by an undesirable increase in temperature in the filament area of the lamp.
  • the lamp also mostly shows a rectifying effect at this stage. Finally it breaks Filament, leading to the destruction of the lamp control gear and a dangerous Overheating of the lamp ends can result.
  • some shutdown devices known:
  • the lamp voltage is often used as a criterion for switching off of the control gear (e.g. EP 0809923).
  • the lamp voltage is subject to strong fluctuations even in normal operation, so that in many cases no clear threshold can be specified, at which a shutdown is to be carried out.
  • the voltage across the coupling capacitor used to detect the rectification effect of the lamp mentioned above A quantitative statement about the value of this voltage must be made and be compared to a threshold.
  • the Value of the voltage to be measured fluctuating strongly during normal operation is subject and therefore no clear threshold is often given can. A reliable shutdown is therefore not in many cases possible or technically very complex.
  • the filaments become an additional source of electricity for the gas discharge with an additional heating current.
  • additional heating current is often opposite the current for the gas discharge is very small, which is why a detection is complex and uncertain.
  • a simple execution of the averager is a first-order low pass, the simplest Case consists only of a resistor and a capacitor.
  • the DC voltage component of the coupling capacitor is now one for the shutdown responsible circuit part (hereinafter referred to as SD) supplied, which has a threshold characteristic at its input. It is important that this feeding is done via a spiral.
  • SD shutdown responsible circuit part
  • the threshold characteristic at the input of the Circuit part SD only needs the DC voltage component of the coupling capacitor to be able to detect. This is right without much effort to implement reliably.
  • no further DC voltage component to the input of the circuit part SD is supplied.
  • the threshold characteristic can be realized by a transistor. If there is a voltage at its input, it prevents charging a capacitor (hereinafter referred to as C7), for example, via its output terminals. If the coil breaks, the input voltage remains off, the capacitor C7 charges and triggers a shutdown of the control gear. The capacitor C7 is in the commissioning discharge the control gear. It thus prevents unwanted shutdown when starting the lamp.
  • the value of the capacitance of the capacitor C7 must be selected so large that a shutdown is only triggered can be after the DC voltage component stabilized at the coupling capacitor. The DC voltage component arises on, this is also an indication that the lamp has ignited properly Has. The DC voltage component on the coupling capacitor can therefore also can be used as "lamp burns" detection.
  • the shutdown of the control gear can be controlled by another Switches. If the other switch is activated, the above AC generator put out of operation. This can be different Way. Usually it is used to generate control signals an auxiliary voltage is required in the AC voltage generator. With the help of said further switch can the auxiliary voltage of the AC voltage generator suppressed and thus a shutdown of the control gear can be achieved.
  • Some AC generators have one separate input to which a signal must be present in order to receive the output signal of the AC voltage generator to be released (release signal). This activation signal can also be used with said additional switch Shutdown purposes are suppressed.
  • Coils that are not according to the invention by detection of the DC voltage component on the coupling capacitor are monitored by another way to be monitored. If the AC voltage generator an auxiliary voltage is required, this can not be monitored via the previously Spirals are performed. If these coils break, the auxiliary voltage supply is switched off interrupted and the AC voltage generator switched off.
  • Another way to monitor previously unmonitored Wendeln consists in the detection of the alternating voltage component in one Lamp connection.
  • the detection of the DC voltage component the supply of electricity for gas discharge of the lamp only on one End of the coil to be detected. At the other end this helix will the applied AC voltage is coupled out via a capacitor. If the helix breaks, the amplitude of the extracted AC voltage becomes significantly reduced.
  • This can be used according to the invention to allow capacitor C7 to be charged to a value like described above, leads to a shutdown of the control gear. Prefers this is done by the capacitor C7 being discharged by a further controlled switch is disturbed.
  • the following requirement is often placed on switching off an operating device set: If the lamp is changed after switching off, this should reset the shutdown and operate the new lamp be made possible. According to the invention, this is accomplished by that the charging current of the capacitor C7 over one or more filaments to be led. If the lamp is removed, the capacitor C7 discharges. If the voltage across capacitor C7 falls below a predetermined value, the shutdown is reset.
  • Self-excited operating devices do not have a separate oscillator.
  • the control signal for the circuit breakers is obtained from the load circuit.
  • the filament in this In case the filament breaks, the filament cannot be switched off DC voltage level on the coupling capacitor is monitored by means of Detection of the AC voltage component explained above take place. Then however, this filament may not only be the charging current of the capacitor Wear C7. The breakage of the helix would be detected, but that subsequent charging of the capacitor C7 would be interrupted, which is why there would be no shutdown. Both are therefore according to the invention Lamp filaments used to provide the charging current for the capacitor C7.
  • capacitors by the letter C resistors through R, inductances through L, transistors through T and diodes through D, each followed by a number.
  • the operating device in FIG. 1 is for operation on an AC voltage network designed.
  • the mains voltage is at the connections AC1 and AC2 of for example 230Veff connected.
  • D1, D2, D3, and D4 form one Full-wave rectifier, one at its outputs P (plus) and M (ground) DC voltage, hereinafter referred to as supply voltage, is available provides.
  • supply voltage a DC voltage
  • An alternating voltage generator G relates its energy via P and M.
  • the AC voltage generator G is an AC voltage with a DC component for operating a gas discharge lamp ready.
  • the AC voltage generator G needs one Auxiliary voltage H.
  • the auxiliary voltage H is only used for commissioning derived from the supply voltage via R1.
  • the Auxiliary voltage H is generated via C3, which is connected to connection J2 of filament W1 is.
  • D5, D6 and C2 are used for rectification and stabilization the AC voltage fed in via C3.
  • the lamp choke L1 connects the output O of the AC voltage generator G with the lamp filament W1 at connection J1.
  • the circuit for the gas discharge current by the lamp Lp from the filament W2 at the connection J3 via the Coupling capacitor C5 closed to ground M.
  • the resonance capacitor C4 On the not with that AC generator G connected side of the lamp is the resonance capacitor C4 with the helix W1 at the connection J2 and with the helix W2 connected to connection J4.
  • a circuit part SD which contains the following components is used for switching off: T3, R2, D7, T4, C7, R5 and R6.
  • the base of lies at the input EDC of SD T4.
  • the T4 emitter lies on ground M. Between the emitter and the collector from T4 lies C7.
  • the voltage at the collector of T4 is via a Zener diode D7 fed to the gate of T3.
  • D7 points to T4 with the cathode.
  • T3 lies with the source on the ground M.
  • the gate of T3 is over R2 with the Mass M connected.
  • the drain of T3 is with the auxiliary voltage connection H of the AC voltage generator G connected.
  • R5 and R6 form one Voltage divider. At the end of R6 is the voltage divider with mass M. connected.
  • T3 is activated and changes to the conductive state.
  • the auxiliary voltage H of the AC voltage generator G short-circuited and the control gear switched off.
  • the input EDC from SD becomes the junction of R3 and R4 driven.
  • the other connection of R4 is at ground M, the other connection from R3, the helix W2 is located at connection J4.
  • Parallel to R4 is C6 connected.
  • the circuit arrangement consisting of R3, R4 and C6 acts as Low pass. This means that the DC voltage component is applied to C5 Voltage via the W2 coil to the EDC input from SD. Thereby In normal operation the potential at the EDC input is so high that there is no shutdown of the control gear. If the helix W2 breaks, there is none DC voltage more at connection J4 of Wendel W2, the potential at The EDC input drops below the threshold on the T4 while it is still conducting and the control gear is switched off. When changing lamps is due the missing coil W1 interrupted the charging current of C7. The potential at the collector of T4 sinks, T3 blocks and the AC voltage generator is restarted with the necessary auxiliary voltage (H) provided.
  • the filament W1 breaks, it is used to operate the AC voltage generator G necessary auxiliary voltage H supplied via C3 is interrupted and thus the operating device is switched off.
  • FIG 2 shows an embodiment of the shutdown according to the invention by means of spiral breakage detection in an operating device with self-excited AC voltage generator G.
  • the device is connected via the connections DC + and DC- supplied with a DC voltage. This corresponds to the supply voltage from Figure 1.
  • DC + and DC- is the series connection from two semiconductor switches T6 and T7, which are designed here as MOSFETs are.
  • the junction between the transistors forms the output O the half-bridge realized by the semiconductor switches T6 and T7.
  • the load current discharged at output O is through a feedback arrangement FB detected and one control circuit DR1 and DR2 for each Semiconductor switches T6 and T7 supplied.
  • the control circuits DR1 and DR2 are located between the gate and source of the semiconductor switches T6 and T7 and cause these semiconductor switches to be switched on and off alternately, whereby at the output O of the half-bridge with respect to DC- a DC voltage component is present.
  • the circuit elements serve for the first start of the half-bridge vibration R20, D20, D21, and C20.
  • the series connection of R20 and D20 is between DC + and the half-bridge output O switched.
  • the Diac D21 is connected.
  • the other end of the Diac D21 is applied to the gate of the upper half-bridge transistor T6.
  • C20 will start up of the device loaded via R20. Exceeds the tension C20 the trigger voltage of the Diacs D21 becomes the upper half-bridge transistor T6 controlled and the vibration of the half-bridge started. about D20 ensures that C20 is discharged during operation.
  • T3 is compared to Figure 1 as a bipolar transistor executed.
  • the collector of T3 is connected via the diode D26 connected to the gate of the lower half-bridge transistor (T7). If T3 is activated, a current flows via D26, which prevents the activation of T7.
  • the resistor R5 is not, as in FIG. 1, directly connected to the connection J2 the coil W1 connected. Rather, it is connected in series a resistor and a diode (R21, D22, R22, D23) with both J2 and also connected to the connection J4 of the helix W2. This will make the Implemented AND operation of the charging current of C7 described above.
  • the AC input EAC of the circuit part is also connected to J2 via C21 SD connected.
  • C21 only conducts the AC voltage component of the Potential at J2 on EAC.
  • a voltage divider follows from the resistors R25 and R26 between EAC and DC-.
  • R25 and R26 At the junction of R25 and R26 is connected to the anode of D25 and the cathode of D24.
  • the anode of D24 is at the low potential of the supply voltage (DC-) and is required to display the negative portion of the AC voltage Evaluate EAC.
  • the cathode of D25 is connected to the capacitor C22.
  • the other connection of C22 is at the low potential the supply voltage (DC-).
  • C22 is used for the integration of D24 and D25 rectified AC voltage applied to EAC.
  • the on C22 applied voltage is a voltage divider, formed from the Resistors R27 and R28 supplied.
  • the junction of R27 and R28 is connected to the base of transistor T5.
  • the emitter of transistor T4 not directly, but via the collector Emitter path from T5 with the low potential of the supply voltage (DC-) connected. If there is no AC voltage EAC is no longer activated to T5 and thus also to T4, so that C7 is charged can be and triggers a shutdown.
  • FIG. 3 shows a variant of the circuit diagram from FIG. 1.
  • the signal the coupling capacitor C5 is sometimes subject to considerable interference.
  • the cause of these disorders is often sporadic contact, one in itself always produces a broken spiral again and again.
  • These disorders work the expansion in Figure 3 with respect to Figure 1 contrary.
  • the connection between the averaging capacitor is C6 and the base of T4 no longer directly, but via the series connection of R31 and the emitter-collector section of transistor T31.
  • the collector of T31 is with the Base of T4 connected and for further interference suppression via the parallel connection connected by R34 and C31 to ground (M).
  • the basis of T31 is via R33 with the mass (M) and via R32 and R35 with the positive pole (P) connected.
  • FIG. 3 Another variation in Figure 3 with respect to Figure 1 is the connection of R5. It is not connected to connection J2 of filament W1 as in FIG. 1, but connected to the positive pole (P) via R35. This will shutdown not reset when replacing the lamp, but only when Power failure.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP01118281A 2000-09-18 2001-07-30 Circuit électronique pour détecter l'usure des filaments de lampes à décharge Expired - Lifetime EP1189487B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10046443A DE10046443A1 (de) 2000-09-18 2000-09-18 Elektronische Schaltung zur Detektion des Wandelbruchs bei Gasentladungslampen
DE10046443 2000-09-18

Publications (3)

Publication Number Publication Date
EP1189487A2 true EP1189487A2 (fr) 2002-03-20
EP1189487A3 EP1189487A3 (fr) 2005-01-05
EP1189487B1 EP1189487B1 (fr) 2007-11-07

Family

ID=7656863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01118281A Expired - Lifetime EP1189487B1 (fr) 2000-09-18 2001-07-30 Circuit électronique pour détecter l'usure des filaments de lampes à décharge

Country Status (9)

Country Link
US (1) US6566822B2 (fr)
EP (1) EP1189487B1 (fr)
KR (1) KR20020021997A (fr)
CN (1) CN1345175A (fr)
AT (1) ATE377926T1 (fr)
AU (1) AU775944B2 (fr)
CA (1) CA2357379A1 (fr)
DE (2) DE10046443A1 (fr)
TW (1) TW522758B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10160790A1 (de) * 2001-01-12 2002-08-08 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Einschalten einer Teilschaltungsanordnung
US7116063B2 (en) * 2003-07-28 2006-10-03 Matsushita Electric Works, Ltd. Dimmable discharge lamp lighting device
CN1874645B (zh) * 2005-05-31 2010-09-29 电灯专利信托有限公司 用于将灯安全连接到设备地的装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111929A1 (fr) * 1982-12-23 1984-06-27 Siemens Aktiengesellschaft Dispositif pour la mise hors circuit d'un onduleur
DE4120649A1 (de) * 1991-06-22 1992-12-24 Vossloh Schwabe Gmbh Ueberspannungsgeschuetztes vorschaltgeraet
EP0808084A2 (fr) * 1996-05-15 1997-11-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Mise hors circuit de sécurité en cas de regime asymétrique

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3608615A1 (de) * 1986-03-14 1987-09-17 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb von niederdruckentladungslampen
DE3805510A1 (de) * 1988-02-22 1989-08-31 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum betrieb einer niederdruckentladungslampe
US5027034A (en) * 1989-10-12 1991-06-25 Honeywell Inc. Alternating cathode florescent lamp dimmer
DE4238409A1 (de) * 1992-11-13 1994-05-19 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb von Niederdruckentladungslampen
US5493181A (en) 1994-03-22 1996-02-20 Energy Savings, Inc. Capacitive lamp out detector
US5612597A (en) * 1994-12-29 1997-03-18 International Rectifier Corporation Oscillating driver circuit with power factor correction, electronic lamp ballast employing same and driver method
DE19505459A1 (de) 1995-02-17 1996-08-22 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Schaltungsanordnung zum Betrieb einer Entladungslampe
US5493180A (en) * 1995-03-31 1996-02-20 Energy Savings, Inc., A Delaware Corporation Lamp protective, electronic ballast
US5952790A (en) * 1996-09-06 1999-09-14 General Electric Company Lamp ballast circuit with simplified starting circuit
DE19715342C1 (de) * 1997-04-12 1998-12-17 Vossloh Schwabe Gmbh Vorschaltgerät für unabhängigen Parallelbetrieb von Niederdruck-Gasentladungslampen
DE19728847C1 (de) * 1997-07-05 1998-08-20 Vossloh Schwabe Gmbh Spannungsgeregeltes Vorschaltgerät für Gasentladungslampen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111929A1 (fr) * 1982-12-23 1984-06-27 Siemens Aktiengesellschaft Dispositif pour la mise hors circuit d'un onduleur
DE4120649A1 (de) * 1991-06-22 1992-12-24 Vossloh Schwabe Gmbh Ueberspannungsgeschuetztes vorschaltgeraet
EP0808084A2 (fr) * 1996-05-15 1997-11-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Mise hors circuit de sécurité en cas de regime asymétrique

Also Published As

Publication number Publication date
AU7216701A (en) 2002-03-21
US6566822B2 (en) 2003-05-20
KR20020021997A (ko) 2002-03-23
ATE377926T1 (de) 2007-11-15
CA2357379A1 (fr) 2002-03-18
US20020047604A1 (en) 2002-04-25
DE10046443A1 (de) 2002-03-28
TW522758B (en) 2003-03-01
DE50113223D1 (de) 2007-12-20
CN1345175A (zh) 2002-04-17
EP1189487A3 (fr) 2005-01-05
EP1189487B1 (fr) 2007-11-07
AU775944B2 (en) 2004-08-19

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