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
  • H05B41/288—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 preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium 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
  • H05B41/02—Details
  • H05B41/04—Starting switches
  • H05B41/042—Starting switches using semiconductor devices

Definitions

• Evaluation device for the ignition energy of a discharge lamp Evaluation device for the ignition energy of a discharge lamp.
• the invention relates to a device for evaluating the ignition energy of a discharge lamp from a signal which is proportional to the voltage applied to the discharge lamp and a signal which is proportional to the current flowing through the discharge lamp during the ignition process.
• a starter is connected to discharge lamps, in particular high-pressure discharge lamps, for ignition, which generates one or a series of high-voltage pulses in order to ignite the discharge lamp.
• the high voltage pulses must have a certain deviszündbeginn U z .
• FIG. 1 shows the time-dependent voltage U L (t) generated on a 400 W high-pressure sodium vapor lamp with a first ignitor.
• FIG. 2 a shows the current and voltage curve of the discharge lamp and the cumulated introduced energy in a wide time range.
• the time-dependent voltage U L (t) and the evaluated ignition voltage U z (U z 3.96 kV).
• the ignition voltage can also be used with a peak voltage detector in be measured in a simple and cost-effective manner.
• FIG. 1 shows the time-dependent voltage U L (t) generated on a 400 W high-pressure sodium vapor lamp with a first ignitor.
• FIG. 2 a shows the current and voltage curve of the discharge lamp and the cumulated introduced energy in a wide time range.
• FIG. 3 shows a peak voltage detector for the evaluation of the positive maximum value of the voltage.
• An analogue-to-digital converter is used for measuring the measurement. If the peak values of each pulse are to be measured for repeating pulses, then it is necessary to discharge the capacitor between the individual pulses, which can be done, for example, by a high-resistance resistor.
• the knife detection system must also have a sufficiently large acquisition rate. It is possible to use the signals of the peak voltage detector to control an igniter.
• the energy can be used, which is coupled into the discharge during the voltage breakdown.
• the oscilloscope together with the voltage, measures a signal that is proportional to the current.
• I L (t) the current flowing through the lamp current I L (t), in which the displacement current has been compensated, also registered with.
• the product of lamp voltage U L (t) and current I L (t) is calculated as the power:
• the time-dependent energy is then calculated by integrating the power PL (t) for the time t:
• FIGS. 1 and 2 a, b show the power P L (t) and the calculated time-dependent energy E (t). It can be seen that the energy E (t) remains at a constant value after the voltage breakdown and when the current has returned to zero. Since the high voltage pulses usually decay within a certain time, the energy which is coupled in during this time is the ignition energy E z .
• This evaluation device should be suitable that it can be integrated in electronic ballasts or ignitors.
• the object of the invention is to provide a device that meets these requirements.
• the device consists of a voltage measuring circuit (1), a current measuring circuit (2) and an evaluation circuit (4).
• the evaluation circuit the current and voltage signals are multiplied together, and the resulting power signal is then integrated to obtain a measure of the ignition energy.
• This voltage which represents the ignition energy, is measured by a fast analog-to-digital converter.
• Fig. 1 voltage and current and the evaluated power and energy of a high voltage pulse for the ignition of a discharge lamp in a high time resolution.
• Fig. 2 a voltage and current and the evaluated power and energy of a high voltage pulse for the ignition of a discharge lamp in a lower time resolution.
• Fig. 4 structure for measuring the ignition energy of a discharge lamp.
• Fig. 4 shows the structure of the evaluation device according to the invention.
• the mains voltage is connected to the discharge lamp via a choke (D) and an ignition device (ZG).
• a suitable voltage divider (1) a signal voltage U 0 is generated.
• a suitable current-voltage converter (2) which is preferably in the recirculation is looped line, a signal Ui is generated in proportion to the current flowing through the lamp.
• the voltage U 0 and the current signal U 1 are connected together with a power supply U 3 to the energy evaluation device (4).
• the voltage signal is connected to an amplifier which drives the input of the threshold detector and the multiplier with a sufficient bandwidth.
• the threshold detector or comparator provides a signal when the applied voltage exceeds a certain threshold.
• the threshold value can be set by means of an adjustable resistor.
• the threshold detector gives the state to a logic board.
• the current signal Ui is connected in addition to the amplified voltage signal U 0 .
• the output is connected to a load resistor and connected to an integration capacitor via a fast switch and a resistor.
• the logic board after the voltage has exceeded a threshold, turns the fast switch on and off again after a specified time. During this time, the applied power signal is integrated, whereby a signal U E z is applied to the integration capacitor proportional to the ignition energy. This signal can be measured by a voltmeter. Since ignitors usually generate a train of pulses with pulse intervals, it is necessary to measure the energies of the individual pulses to use a measuring system that has a sufficiently large Has collection rate.
• the integration capacitor must also be reset, which can be realized by a short-circuit switch.
• This switch may receive its drive signal from the logic board or from the blade detection system.
• the logic subassembly gives a signal with a short time duration to this short-circuit switch after a defined time after which the voltage has exceeded the threshold value.
• This device works independently and can be set up as a separate working system. It is also possible to integrate this evaluation device in an ignitor or in an electronic ballast. For these applications, it is necessary to adapt the times of the logic module to the requirements.

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• Circuit Arrangements For Discharge Lamps (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)

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Publications (1)

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• 2007
  • 2007-03-01 DE DE202007003032U patent/DE202007003032U1/de not_active Expired - Lifetime
• 2008
  • 2008-02-14 WO PCT/EP2008/051773 patent/WO2008104461A1/de not_active Ceased
  • 2008-02-14 PL PL08716843T patent/PL2127498T3/pl unknown
  • 2008-02-14 US US12/529,343 patent/US8278836B2/en not_active Expired - Fee Related
  • 2008-02-14 CN CN200880002575XA patent/CN101584251B/zh not_active Expired - Fee Related
  • 2008-02-14 JP JP2009551162A patent/JP2010520583A/ja not_active Ceased
  • 2008-02-14 EP EP08716843A patent/EP2127498B1/de not_active Not-in-force

Patent Citations (3)

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