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
  • H05B41/2806—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 without electrodes in the vessel, e.g. surface discharge lamps, electrodeless discharge lamps
• • 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
• • 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
• • 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

• the present invention relates to a circuit arrangement for operating at least one dielectrically impeded discharge lamp with a flyback converter, which has a switch to generate an operating signal for the at least one dielectrically impeded discharge lamp, and a drive circuit for the switch, which is designed, a pulse width modu Provide lated square wave signal to the switch, wherein the duty cycle of the pulse width modulated square wave signal depend on the value of the resistance of a connected to the drive circuit resistor arrangement. It also relates to an operating method for at least one dielectrically impeded lamp on such a circuit arrangement.
• the flyback converter has a DC voltage source, a transformer and connections for a dielectrically impeded discharge lamp.
• the switch-on duration of the pulse-width-modulated square-wave signal applied to the switch of the flyback converter the energy impressed into the transformer can be varied.
• the present invention relates to the problem of dimming a dielectrically impeded discharge lamp.
• a dimming of a dielectrically impeded discharge lamp is hitherto unknown, but is fundamentally possible, since an initial capacitance existing between the electrodes before ignition breaks down after ignition, and therefore the lamp with lower energy, i. H. dimmed, can be operated.
• the dimming position is maintained after switching off the discharge lamp.
• the energy provided by the known from the prior art circuit arrangement to the lamp according to the dimming position for the ignition of the discharge lamp is not sufficient.
• the underlying object of the present invention is therefore to develop the generic circuit arrangement or the generic method such that switching on a dielectrically impeded discharge lamp in the dimmed state is made possible.
• the present invention is based on the finding that the object described above can be achieved if the value of the resistance of the resistor arrangement has at least one time-dependent component. This makes it possible for the purpose of igniting the lamp, a short-term increase in the value of the resistance of the resistor arrangement can be made and immediately after the ignition to the value the resistance of the resistor assembly, which corresponds to the dimming position at the time of switching off the circuit arrangement, can be returned. This ensures that, depending on the dimensioning of the circuit arrangement, the lamp is switched on in its dimming position for a user.
• the short period of time during which the lamp is operated at higher energy to allow for ignition may be set so short that it is hardly or not at all noticed by a user.
• a preferred embodiment therefore further comprises a timer in order to switch off the time-dependent component after a predefinable period of time.
• the timer may be formed, for example, as an RC element.
• a temporal transition phase can be advantageous if an adaptation phase for the human eye to the dimmed state is to be provided.
• the predefinable time period is preferably less than 200 ms, preferably 20 ms to 200 ms and in particular 40 ms to 100 ms.
• the temporal transition phase is preferably up to 200 ms, preferably 30 to 100 ms.
• the resistor arrangement further comprises a time-independent component which comprises a predefinable basic resistance value and a predefinable dimming resistance value which is dependent on a dimming position of the circuit arrangement.
• the basic resistance value is preferably constant and the dimming resistance value can be set between a minimum value and a maximum value.
• the first-mentioned dimensioning rule ensures that in the ignition phase of the lamp of the circuit arrangement only the provision of an energy is demanded, which is below a predeterminable limit and therefore does not lead to damage to the circuit arrangement.
• the second-mentioned dimensioning rule ensures that even with maximum dimming of the lamp, which corresponds to a minimum dimming resistance value, a sufficient energy for the ignition of the discharge lamp is provided to the discharge lamp.
• the dimming resistance value and the base resistance value can be realized, for example, by a potentiometer which in its minimum position corresponds to the resistance value composed of the base resistance value and the minimum dimming resistance value and, in its maximum position, corresponds to the resistance value which varies from the base resistance value and the maximum dimming resistance value.
• the time dependent resistance value is 50% to 70% of the maximum dimming resistance value.
• the figure shows a schematic representation of an embodiment of a circuit arrangement according to the invention.
• a lamp La1 which is connected between the terminals a, b, operated from a circuit arrangement with flyback topology.
• a DC voltage source Uo which may be 12 V or 24 V, for example, and a reference potential
• a transformer comprising the windings TR1-A, TR1-B, TR1-C, and a switch T1 is arranged.
• the structure and operation of this part of the circuit arrangement according to the invention are described in detail in DE 197 31 275.6.
• the lamp La1 Because of its dielectrically impeded electrodes 10, 12, the lamp La1 has a non-negligible sigbare capacitance of size C L and forms together with the primary winding TR1-A a resonant circuit.
• the discharge lamp La1 is supplied with voltage pulses of positive polarity.
• the switch T1 switches at a clock frequency of about 25 kHz to 100 kHz. Accordingly, the lamp La1 is supplied with voltage pulses having a pulse repetition frequency of about 25 kHz to 100 kHz.
• a pulse width-regulated legal signal is preferably used, the switch-off periods being constant and the switch-on periods varying.
• VCO Voltage Controlled Oscillator
• the duty cycles of the square wave signal provided at the output of the voltage controlled oscillator 16 are dependent upon the resistance of a resistor array 20 connected to the input 18 of the VCO 16.
• the resistor array 20 is composed of a base resistance R1, a dimming resistance R2, and a time dependent resistance R3.
• the time control for the time-dependent resistance R3 here comprises a capacitor C2, which is applied to the base-emitter path of a bipolar transistor T2 and via a resistor R4, which is connected in parallel with a diode D1, is rechargeable.
• the parallel circuit of the resistor R4 and the diode D1 is connected to the output of an inverter INV, on the input side via a resistor R5 to the voltage source Uo, on the other hand via a switch T3, which can be opened or closed by an operator with connected to the ground potential.
• the capacitor C2 is charged via the resistor R4, wherein the resulting time constant can be determined by suitable dimensioning of the resistor R4 and the capacitor C2.
• the VCO 16 provides a pulse width modulated square wave signal to the switch T1 corresponding to the supply of the lamp La1 with an energy corresponding to the dimming position of the resistor R2 at the time of the last turn-off of the lamp La1.
• the diode D1 serves to discharge the capacitor C2 when the switch T3 closes and opens shortly, so that the capacitor C2 is discharged again at the next switch-on operation, ie closing of the switch T3, by the predetermined value - Provide the determination of the resistor R4 and the capacitor C2 fixed time constant.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=37198837

Family Applications (1)

Country Status (9)

Family Cites Families (6)

• 2005
  • 2005-08-08 DE DE102005037352A patent/DE102005037352A1/de not_active Withdrawn
• 2006
  • 2006-08-04 JP JP2008525445A patent/JP2009505339A/ja not_active Abandoned
  • 2006-08-04 CN CNA2006800291937A patent/CN101238758A/zh active Pending
  • 2006-08-04 KR KR1020087005426A patent/KR100924415B1/ko not_active IP Right Cessation
  • 2006-08-04 EP EP06776625A patent/EP1913799A1/de not_active Withdrawn
  • 2006-08-04 US US11/989,998 patent/US20090289563A1/en not_active Abandoned
  • 2006-08-04 WO PCT/EP2006/007754 patent/WO2007017203A1/de active Application Filing
  • 2006-08-04 CA CA002617475A patent/CA2617475A1/en not_active Abandoned
  • 2006-08-07 TW TW095128837A patent/TW200714136A/zh unknown

Non-Patent Citations (1)

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