WO2002028152A1 - Circuit de commande de lampe a decharge a haute intensite - Google Patents

Circuit de commande de lampe a decharge a haute intensite Download PDF

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Publication number
WO2002028152A1
WO2002028152A1 PCT/JP2001/008359 JP0108359W WO0228152A1 WO 2002028152 A1 WO2002028152 A1 WO 2002028152A1 JP 0108359 W JP0108359 W JP 0108359W WO 0228152 A1 WO0228152 A1 WO 0228152A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
power
circuit
voltage
hid
Prior art date
Application number
PCT/JP2001/008359
Other languages
English (en)
Japanese (ja)
Inventor
Minoru Matsumoto
Original Assignee
Iwasaki Electric Co., Ltd.
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 Iwasaki Electric Co., Ltd. filed Critical Iwasaki Electric Co., Ltd.
Priority to AU2001292247A priority Critical patent/AU2001292247A1/en
Publication of WO2002028152A1 publication Critical patent/WO2002028152A1/fr

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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
    • H05B41/288—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
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • 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
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • 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
    • H05B41/38—Controlling the intensity of light
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase
    • H05B41/388—Controlling the intensity of light during the transitional start-up phase for a transition from glow to arc
    • 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 an HID lamp lighting circuit for lighting a HID lamp such as a metal halide lamp, a light source for a liquid crystal projector, and a headlight for automobiles and other vehicles used for lighting indoor and commercial facilities such as stores.
  • a HID lamp such as a metal halide lamp
  • a light source for a liquid crystal projector such as a liquid crystal projector
  • a headlight for automobiles and other vehicles used for lighting indoor and commercial facilities such as stores.
  • HID lamps High Intensity Discharge Lamps
  • high-intensity discharge lamps or high-pressure discharge lamps not only have excellent luminous efficiency with respect to power consumption, but also generate less heat for the same amount of light compared to halogen lamps and have less safety. Due to its high power, it has recently been used where high-intensity light sources are required, such as lighting for indoor commercial facilities and outdoor facilities.
  • This HID lamp is started to discharge by applying a high voltage of several kV at the time of starting, and thereafter is self-discharged by applying a relatively low lamp voltage of several tens to several hundreds of volts. The lamp voltage increases and the HID lamp is turned on.
  • Fig. 9 shows a general lighting circuit 41 for lighting such an HID lamp with an AC square wave pulse.
  • the main circuit 2 applies a lamp voltage of several tens to several hundreds of volts to the HID lamp 1;
  • a starting circuit 3 for applying a high starting voltage of kV is provided.
  • the main circuit 2 includes a rectifier circuit 5 for full-wave rectification of a sine AC wave supplied from the AC power supply 4, a power factor correction circuit 6 for converting the rectified pulsating voltage to a DC smoothed voltage, and A chopper circuit 7A for converting the pulse into a rectangular pulse having a pulse width and a power control circuit 8 including a smoothing circuit 7B for smoothing the rectangular pulse again to obtain a DC lamp voltage corresponding to the target lamp power; An inverter 9 for converting the lamp voltage into an AC square wave voltage of the same voltage is provided, and the inverter 9 is connected to the HID lamp 1 via the starting circuit 3.
  • the starting circuit 3 has a step-up transformer (not shown), and the lighting switch of the HID lamp 1 When a switch (not shown) is turned on, a high-voltage starting voltage of several kV is generated so as to start a discharge between the electrodes of the HID lamp 1.
  • the lighting circuit 41 when the lighting switch (not shown) is turned on, a starting voltage of several kV is applied to the HID lamp 1 from the starting circuit 3 to start discharging, and after the discharging starts, When a relatively low lamp voltage of several tens to several hundreds of volts supplied from the main circuit 2 is applied, the lamp is self-sustained and the lamp voltage gradually increases, and the HID lamp is turned on.
  • the temperature inside the lamp gradually rises, and the vapor pressure reaches a steady value, and the required amount of light is obtained, but it takes several minutes before that.
  • the lamp voltage is applied so that the rated power is used immediately after the start of the discharge, the electrodes are damaged and the product life of the HID lamp 1 is shortened.
  • the lighting circuit 41 of the HID lamp 1 has responded to the demand for miniaturization by configuring a control circuit using a hybrid IC and increasing its mounting density.
  • control circuits using hybrid ICs are not only difficult to change specifications, but also individually designed according to the type of HID lamps, such as high-pressure mercury lamps, methanololeno, ride lamps, and high-pressure sodium lamps, and differences in rated power. Because of the differences, they could not be shared, and the production cost increased.
  • PWM control has the disadvantage that the pulse width resolution is stepwise, and it is difficult to control the lamp power to an arbitrary value.
  • control circuit is computerized and the lighting circuit is miniaturized, if heat is generated inside, the life of the electronic component is significantly reduced.
  • the main cause of this heat generation is the switching loss of the chopper circuit 7A.
  • the lighting circuit 41 is provided with a forced cooling fan or the like, it becomes difficult to reduce the size.
  • the HID lamp can be turned on immediately after the start of discharge without damaging the electrodes, and the lamp power is variably controlled by PWM control.
  • PWM control it is possible to control with a precision finer than the clock frequency of the computer, and furthermore, it is a technical problem to suppress the heat generation due to the switching loss of the chopper circuit without providing a cooling fan or the like. Disclosure of the invention
  • a low-pressure lamp voltage corresponding to the lamp power supplied from a main circuit is applied to the self-sustaining lamp.
  • a lamp power control circuit including a switching element for converting the input DC smoothed voltage to a DC pulse voltage and outputting a target lamp power is formed in the main circuit,
  • the lamp power After starting the discharge of the HID lamp and before supplying the lamp power of the rated operating power, the lamp power is set lower than the rated operating power and the lighting start power is set to enable self-sustained discharge.
  • Lighting start control means for outputting a power control pulse signal to the switching element so as to raise the lamp power to the rated operating power when the power reaches a predetermined value;
  • Lamp power control means for increasing / decreasing the pulse width of the power control pulse signal by the length of one clock pulse;
  • An input voltage control pulse signal is output to a power factor correction circuit connected to an input side of the lamp power control circuit, and the DC smoothed voltage input from the power factor correction circuit to the lamp power control circuit is controlled by lamp power control.
  • a control unit having input voltage control means for variably controlling the output voltage according to the output voltage of the circuit.
  • a lamp voltage according to the lighting start power is applied before applying a lamp voltage according to the rated operating power.
  • This lighting start power can maintain the self-sustained discharge of the HID lamp and is set to about 15 of the rated power use, so that the electrode damage is small and As a result, the product life of the HID lamp is extended.
  • the lamp power supplied to the lamp is increased to the rated power consumption, and at this time, the required light amount is obtained.
  • the time to get up is not too slow.
  • the lamp power is changed so that the time average of the lamp power, which fluctuates according to the pulse width of the power control pulse signal output to the switching element of the lamp power control circuit, matches the preset target lamp power.
  • the pulse width of the control pulse signal is increased or decreased by the length of one clock pulse.
  • the pulse width of the power control pulse signal to output the appropriate power in units of time shorter than one pulse
  • the calculated average of the lamp power and the target lamp power are compared. Therefore, the difference for one clock pulse is averaged, and power can be controlled in a time unit shorter than the time for one clock pulse.
  • the voltage drop rate of the lamp power control circuit can be kept within a range excellent in conversion efficiency. Since it can be maintained, power loss in the lamp power control circuit can be reduced.
  • FIG. 1 is a block diagram showing an overall configuration of a lighting circuit according to the present invention
  • FIG. 2 is a circuit diagram showing a power factor improving circuit
  • FIG. 3 is a circuit diagram showing a lamp power control circuit
  • FIG. 5 is a flowchart showing a processing procedure of the lamp power control means
  • FIG. 6 is a flowchart showing a processing procedure of the input voltage control means
  • FIG. 7 is a signal waveform in the power factor correction circuit.
  • FIG. 8 is a graph showing a change in lamp voltage at the start of lighting
  • FIG. 9 is a circuit diagram showing the general lighting circuit described above.
  • the lighting circuit S shown in FIG. 1 includes a power supply circuit E for lighting the HID lamp 1,
  • the power supply circuit E consists of a main circuit 2 that applies a relatively low rated voltage of several tens to several hundreds of volts to the HID lamp 1, and a high voltage of several kV.
  • a starting circuit 3 for applying a starting voltage is provided.
  • the main circuit 2 comprises a rectifier circuit 5 for full wave rectifying a sine AC voltage supplied from an AC power source 4, a power factor improving circuit 6 for converting the full wave rectified pulsating voltage to a DC smoothed voltage V 2, the DC A chopper circuit 7 A for converting the smoothed voltage V 2 into a rectangular pulse having a predetermined pulse width to control the supplied power, and a smoothing circuit 7 for smoothing the rectangular pulse again to obtain a preset DC lamp voltage V 3 7 B, and a full-bridge type impeller 9 for converting the obtained DC lamp voltage V 3 to an AC square wave voltage V 4 having the same potential as the lamp power control circuit 8. Connected to HID lamp 1 via 3.
  • the power factor improving circuit 6 as shown in FIG. 2, and converts the full-wave rectified pulsating voltages V 1 by the rectifying circuit 5 into a DC smoothed voltage V 2, the boost one buck converter using a switching the regulation Yu regulator Is formed.
  • This power factor correction circuit 6 has a FET (field effect transistor) 10A on the + side, a coil 11 and a diode 12 connected in series, and a diode 13 and a FET 10B between the + side and one side.
  • the capacitors 14 are connected in parallel, and the drivers 10 a and 10 b of the FETs 10 OA and 10 B are connected to the control unit C via the PWM control circuit 15.
  • the lamp power control circuit 8 converts the DC smoothed voltage V 2 input from the power factor improvement circuit 6 into a rectangular pulse wave having a predetermined pulse width by the chopper circuit 7 A at the preceding stage, and converts this into a rectangular pulse wave at the subsequent stage by the smoothing circuit 7 B at the subsequent stage. a shall to output the DC lamp voltage V 3 which is preset by smoothing.
  • a switching element disposed in the chopper circuit 7A is controlled by a power control pulse signal supplied from the PWM control circuit 15 of the control unit C through the dry cell 16a.
  • a power control pulse signal supplied from the PWM control circuit 15 of the control unit C through the dry cell 16a.
  • FET field effect transistor
  • a rectangular pulse having a pulse width corresponding to the target lamp voltage value VL is output, and this is smoothed by the smoothing circuit 7 B to obtain the target lamp voltage value. and summer so as to output the VJ this same lamp voltage V 3.
  • the control unit C is composed of a single-chip microcomputer 17 and the like, and the input side of the control unit C receives the input voltage of the power factor correction circuit 6, the input voltage, the output voltage, and the output current of the lamp power control circuit 8, respectively.
  • Reference numeral 21 denotes a communication computer which controls the lighting circuit S based on a control signal transmitted from an external device (not shown), and controls various control data of the lighting circuit S by a host computer. When transmitting to a device such as a complex, relay the signal between the external device and the control unit C according to the communication protocol.
  • FIG. 4 is a flowchart showing a processing procedure of the lighting start control means in the control unit C.
  • step STP1 the process waits until the high voltage is applied by the starting circuit 3 to start discharging, and when the start of discharging is confirmed, the process proceeds to step STP2.
  • the lamp current is 0 because the HID lamp 1 is in a non-conducting state, but since the current flows when the discharge is started, this is detected by the sensor 20b. Check the start of discharge.
  • step S TP 2 the lamp power W 3 lower than the rated power consumption W R, and outputs a power control pulse signal to the lamp power control circuit 8 so as to suppress the self-sustaining dischargeable lighting start power W s , to maintain the self-sustaining discharge of the HID lamp 1 by applying a ramp voltage V 3 corresponding to the start of lighting power W s.
  • step STP 3 calculates the amount of heat supplied to the 1110 lamp 1 based on the lamp voltage V 3 and the lamp current I 3 detected by the sensors 20 a and 20 b and the application time. It is determined whether or not the calorific value set in STP4 has been reached.
  • step STP 5 the lamp power W 3 is increased, the lamp voltage V 3 With this being raised.
  • step S after TP 6 in lamp power W 3 is judged to have reached to the rated power consumption W R, the step S then proceeds to TP 7, the sensor 20 a ⁇ Pi 20 b at the detected lamp voltage V 3 and the lamp power is calculated by the product of lamp current I 3 is to be maintained at the rated power consumption, so as to control the lamp voltage V 3.
  • FIG. 5 is a flowchart showing a processing procedure of the lamp power control means in the control unit C.
  • step STP 11 calculates a target lamp voltage value based on the lamp current I 3 detected by the target lamp power and the sensor 20 b, PWM control circuit
  • the pulse width of the power control pulse signal output from 5 is set by the number of pulses of the control unit C corresponding to the target lamp voltage value VL .
  • step STP12 the power control pulse signal is transmitted to the lamp power control circuit.
  • step STP 13 calculates the power consumption from the start of time measurement based on the sensor 20 a and 20 b lamp voltage detected by V 3 and the lamp current I 3
  • step STP14 the target power is compared with the target power obtained by multiplying the target lamp power by the time. If they match, the process returns to step STP12 without changing the pulse width of the power control pulse signal. -If the power consumption is large, go to step STP15, narrow the pulse width of the power control pulse signal by one clock pulse, output it to the lamp power control circuit 8, and return to step STP13. .
  • step STP16 in which the pulse width of the power control pulse signal is increased by one clock pulse and output to the lamp power control circuit 8, and then the process returns to step STP13.
  • the amount of power consumed since the start of timekeeping is compared with the target amount of energy at the same time, and the clock pulse is increased or decreased one by one.
  • the time average of the more variable lamp power is controlled so as to coincide with a preset target lamp power.
  • the control is performed based on the average value of the detected electric energy, one pulse per pulse is averaged, and the electric power can be controlled in units of time shorter than the time of one clock pulse.
  • FIG. 6 is a flowchart showing a processing procedure of the input voltage control means in the control unit C
  • FIG. 7 is a waveform diagram showing an output input voltage control pulse signal.
  • This input voltage control means suppresses heat generation of the lighting circuit S due to switching loss of the chopper circuit 7A.
  • step STP 21 the sensor 20 a by the lamp voltage V 3 is detected, and calculates the target DC smoothed voltage $ V 2 by 1.1 to 2.0 times this in step STP 22.
  • the high-level time of the control pulse signal P B (the conduction time of the FET 10 B) T B is
  • step S TP 2 6 how, in the case of pulsating voltage> DC smoothed voltage V 2, the process proceeds to step S TP 2 6, while maintaining the FET 1 0 B nonconductive, outputs a control pulse signal P A to FET 1 0 A and, to step down the pulsating voltage E to the target DC smoothed voltage $ V 2.
  • the high-level time of the control pulse signal P A (the conduction time of the FET 10A) T A is
  • T A (K a XLXV X ) / (V ⁇ V 2 )
  • Ka a ($ V 2 -V 2 ) ⁇ is a proportional constant
  • steps STP 23 to 26 is repeated until the processing of the half-wave of the pulsating voltage is completed in step STP 27, and the process returns to step STP 21 when the processing of the half-wave is completed.
  • a starting switch (not shown) is turned on, a starting voltage is applied from the starting circuit 3 and the discharge of the HID lamp 1 is started, a lighting start control is performed by the control unit C. processing is performed, as shown in FIG. 8 (a), first, the lamp voltage V 3 which is suppressed to a low lighting start voltage value V s than the rated use voltage values V R is applied to the HID lamp 1.
  • the lamp voltage V 3 since the lamp voltage V 3 is set low, it becomes the DC smoothed voltage V 2 inputted from Richikararitsu improving circuit 6 by the input voltage control unit to the lamp power control circuit 8 is suppressed rather low, Accordingly, the drop rate of the input / output voltage of the lamp power control circuit 8 is small, and the loss of the chirp circuit 7A can be suppressed low.
  • FIG. 8 (b) after the discharge begins, the lamp power W 3 is gradually increased to the rated power usage V R from the start of lighting power V s, and the rated power used at the time the internal vapor pressure of the lamp 1 has reached a predetermined value may be controller ports Lumpur so that the W R.
  • the lamp power control means sets the lamp power in advance. since the voltage controlled so as to coincide with the target power, when the turning on at the rated power consumption if example embodiment, HID lamp 1 is turned on at the proper lamp voltage V 3 as its power is obtained.
  • the pulse width of the power control pulse signal is increased or decreased by one clock pulse so that the time average of the lamp power matches the preset target lamp power. Even when it is necessary to control the pulse width of the power control pulse signal for output in units of less than one clock pulse, the difference for one clock pulse is averaged and the time shorter than the time for one clock pulse is averaged. It is possible to control power in units. Industrial applicability
  • the HID lamp can be turned on immediately after the start of discharge without damaging the electrodes. It is possible to control with finer precision, and it is possible to reduce the heat generated by the switching loss of the chopper circuit without providing a cooling fan.

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

Cette invention concerne un circuit de commande qui permet de réduire les dégâts auxquels sont exposées les électrodes d'une lampe à décharge à haute intensité au moment où on l'allume, dans lequel la puissance de la lampe est commandée avec une plus grande précision que la fréquence d'horloge d'un ordinateur et où le circuit de régulation de puissance de la lampe ne dégage pas de chaleur. Le circuit de commande comprend une unité de commande (C) comportant :un moyen de commande de début d'allumage qui coupe la puissance de la lampe en dessous d'une puissance nominale de travail après allumage de la lampe à décharge (1), maintient la puissance de la lampe au niveau de la puissance de début d'allumage à laquelle la lampe peut soutenir la décharge, et porte la puissance de la lampe jusqu'à sa valeur nominale de travail une fois que la pression de la vapeur intérieure de la lampe (1) a atteint une valeur prédéterminée ; un moyen de commande de puissance de lampe qui fait varier la largeur d'impulsion du signal d'impulsion de commande de lampe à raison d'une impulsion d'horloge de telle sorte que la durée moyenne de la variation de puissance de lampe en fonction de la largeur du signal d'impulsion pendant la décharge à auto-maintien soit conforme à la puissance recherchée de lampe ; et un moyen de commande de la tension d'entrée permettant de faire varier la tension de lissage de courant continu à l'entrée du circuit de commande de puissance de lampe (8) en fonction de sa tension de sortie.
PCT/JP2001/008359 2000-09-26 2001-09-26 Circuit de commande de lampe a decharge a haute intensite WO2002028152A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001292247A AU2001292247A1 (en) 2000-09-26 2001-09-26 Hid lamp operating circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000-293177 2000-09-26
JP2000293177A JP4724909B2 (ja) 2000-09-26 2000-09-26 Ｈｉｄランプの点灯回路

Publications (1)

Publication Number Publication Date
WO2002028152A1 true WO2002028152A1 (fr) 2002-04-04

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PCT/JP2001/008359 WO2002028152A1 (fr) 2000-09-26 2001-09-26 Circuit de commande de lampe a decharge a haute intensite

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AU (1) AU2001292247A1 (fr)
WO (1) WO2002028152A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104244545A (zh) * 2014-09-15 2014-12-24 中国科学院上海光学精密机械研究所 带氙灯的触发预燃装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4030884B2 (ja) * 2003-01-22 2008-01-09 Ｎｅｃディスプレイソリューションズ株式会社 放電ランプ点灯用電源装置
JP5464521B2 (ja) * 2010-07-20 2014-04-09 株式会社東通研 誘導放電限界回路を用いた安定器

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04325875A (ja) * 1991-04-24 1992-11-16 Matsushita Electric Works Ltd パルス発生装置
JPH06302388A (ja) * 1993-04-12 1994-10-28 Ikeda Densoo Kk 放電灯点灯装置
US5654611A (en) * 1994-12-07 1997-08-05 Nippondenso Co., Ltd. Lamp control circuit having a V-I converter with slopes of different magnitudes and a second resistor connected in series with a first such that the second senses the output current of the V-I converter
JPH10341572A (ja) * 1997-06-05 1998-12-22 Tdk Corp スイッチング電源
JPH1141925A (ja) * 1997-07-24 1999-02-12 Fujitsu Ltd スイッチング電源
JP2000195693A (ja) * 1998-12-28 2000-07-14 Toshiba Lighting & Technology Corp 放電灯点灯装置、照明装置およびプロジェクタ装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04325875A (ja) * 1991-04-24 1992-11-16 Matsushita Electric Works Ltd パルス発生装置
JPH06302388A (ja) * 1993-04-12 1994-10-28 Ikeda Densoo Kk 放電灯点灯装置
US5654611A (en) * 1994-12-07 1997-08-05 Nippondenso Co., Ltd. Lamp control circuit having a V-I converter with slopes of different magnitudes and a second resistor connected in series with a first such that the second senses the output current of the V-I converter
JPH10341572A (ja) * 1997-06-05 1998-12-22 Tdk Corp スイッチング電源
JPH1141925A (ja) * 1997-07-24 1999-02-12 Fujitsu Ltd スイッチング電源
JP2000195693A (ja) * 1998-12-28 2000-07-14 Toshiba Lighting & Technology Corp 放電灯点灯装置、照明装置およびプロジェクタ装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104244545A (zh) * 2014-09-15 2014-12-24 中国科学院上海光学精密机械研究所 带氙灯的触发预燃装置

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JP4724909B2 (ja) 2011-07-13
JP2002110382A (ja) 2002-04-12

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