JPH04342993A - Discharge lamp lighting device - Google Patents

Discharge lamp lighting device

Info

Publication number
JPH04342993A
JPH04342993A JP3115941A JP11594191A JPH04342993A JP H04342993 A JPH04342993 A JP H04342993A JP 3115941 A JP3115941 A JP 3115941A JP 11594191 A JP11594191 A JP 11594191A JP H04342993 A JPH04342993 A JP H04342993A
Authority
JP
Japan
Prior art keywords
power
lamp
converter
output
voltage
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
JP3115941A
Other languages
Japanese (ja)
Other versions
JP2982373B2 (en
Inventor
Satoshi Nagai
敏 永井
Kenji Nakamura
謙二 中村
Hiroyasu Shiichi
広康 私市
Hiroyoshi Yamazaki
山崎 広義
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP3115941A priority Critical patent/JP2982373B2/en
Publication of JPH04342993A publication Critical patent/JPH04342993A/en
Application granted granted Critical
Publication of JP2982373B2 publication Critical patent/JP2982373B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

PURPOSE:To stabilize the output light in a short period of time by supplying the power at the time of starting, first in an amount several time as large as the rating until the lamp voltage attains the No.1 specified value, and then according to a specific formula until the lamp voltage attains the No.2 specified value, and thereafter decreasing the power by a certain amount at each unitary interval time until the converter output power becomes a specified value. CONSTITUTION:At starting, a high voltage generator circuit 10 generates a high voltage to light up a discharge lamp 8, and a lap state sensing circuit 7 senses the lamp current while a power sensing circuit 4 senses power information. A control circuit 3 controls a DC-DC converter 2 in conformity to information of circuits 4, 7 to supply the lamp 8 with a power several times as large as the rating until the lamp voltage attains the specified value. The control circuit 3 also controls so that the converter 2 power becomes the starting power subtracted by the lamp voltage which is multiplied with specified current until the lamp voltage becomes the No.2 specified value. Thereafter the control circuit 3 decreases the output power of the converter 2 by a certain amount at each until interval time so as to maintain the rated power finally. Thereby the output light is stabilized in a short period of time.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】この発明は、高圧水銀ランプ,メ
タルハライドランプ等の放電ランプの点灯装置に関し、
特にその始動時の制御に関するものである。
[Field of Industrial Application] This invention relates to a lighting device for discharge lamps such as high-pressure mercury lamps and metal halide lamps.
In particular, it relates to control at the time of starting.

【0002】0002

【従来の技術】図6はこの種放電ランプの点灯装置のブ
ロック図である。図において、1は直流電源、2は直流
電源1の電圧を所要の値に昇圧するDC−DCコンバー
タ、8は当該装置の負荷である放電ランプ、6は放電ラ
ンプ8の電流を制御するチョークコイル、9は始動の際
放電ランプ8により高電圧を印加し封入ガスの絶縁破壊
を行うイグナイタ回路である。
2. Description of the Related Art FIG. 6 is a block diagram of a lighting device for a discharge lamp of this type. In the figure, 1 is a DC power supply, 2 is a DC-DC converter that boosts the voltage of the DC power supply 1 to a required value, 8 is a discharge lamp that is the load of the device, and 6 is a choke coil that controls the current of the discharge lamp 8. , 9 is an igniter circuit that applies a high voltage to the discharge lamp 8 during startup to cause dielectric breakdown of the sealed gas.

【0003】この放電灯点灯装置では、始動時の制御を
行っていない。
[0003] This discharge lamp lighting device does not perform control at the time of starting.

【0004】0004

【発明が解決しようとする課題】前述のような始動時の
制御を行っていない放電灯点灯装置では、点灯後の経過
時間と光出力(光束)の関係は図7のようになる。
In a discharge lamp lighting device that does not perform the above-mentioned startup control, the relationship between the elapsed time after lighting and the light output (luminous flux) is as shown in FIG.

【0005】図から明らかなように、点灯してから光出
力が安定するまでに相当の時間を要し、また、点灯して
から光出力が安定するまでに光出力が著しく変化する。
As is clear from the figure, it takes a considerable amount of time for the light output to stabilize after the light is turned on, and the light output changes significantly from the time the light is turned on until the light output stabilizes.

【0006】この発明は、このような問題に鑑みてなさ
れたもので、始動の際に、光出力が短時間に安定する放
電灯点灯装置を提供することを目的とするものである。
The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a discharge lamp lighting device in which the light output is stabilized in a short period of time upon startup.

【0007】[0007]

【課題を解決するための手段】この発明では、前記目的
を達成するため、放電灯点灯装置をつぎの(1),(2
)のとおりに構成する。
[Means for Solving the Problems] In order to achieve the above object, the present invention provides a discharge lamp lighting device with the following features (1) and (2).
).

【0008】(1)DC−DCコンバータと、該DC−
DCコンバータの出力側に接続されたインバータと、該
インバータの出力側に直列接続されたインダクタ及び負
荷放電ランプの接続される出力端と、前記DC−DCコ
ンバータの出力電力を検出する出力電力検出手段と、前
記負荷放電ランプのランプ電圧及びランプ電流を検出す
るランプ状態検出手段と、前記出力電力検出手段の出力
及び前記ランプ状態検出手段の出力を入力し、前記DC
−DCコンバータの出力電力を制御する制御手段とを備
えた放電灯点灯装置であって、前記制御手段は、ランプ
電圧またランプ電流により点灯を検知し、その後ランプ
電圧が第1の所定値になるまで、前記DC−DCコンバ
ータの出力電力が定格電力の数倍の始動電力になるよう
制御し、その後ランプ電圧が第2の所定値になるまで、
DC−DCコンバータの出力電力が、該始動電力からラ
ンプ電圧に所定電流値をかけた値の電力を差引いた値に
なるよう制御し、その後DC−DCコンバータの出力電
力が所定の値になるまで、DC−DCコンバータの出力
電力が単位時間毎に一定電力だけ減少するよう制御する
ものである放電灯点灯装置。
(1) DC-DC converter and the DC-DC converter
An inverter connected to the output side of the DC converter, an inductor connected in series to the output side of the inverter, and an output end connected to the load discharge lamp, and an output power detection means for detecting the output power of the DC-DC converter. and a lamp state detecting means for detecting the lamp voltage and lamp current of the load discharge lamp; the output of the output power detecting means and the output of the lamp state detecting means are input;
- A discharge lamp lighting device comprising: a control means for controlling the output power of the DC converter, wherein the control means detects lighting based on the lamp voltage or lamp current, and then the lamp voltage becomes a first predetermined value. until the output power of the DC-DC converter becomes a starting power several times the rated power, and then until the lamp voltage reaches a second predetermined value,
The output power of the DC-DC converter is controlled to be the value obtained by subtracting the power equal to the lamp voltage multiplied by a predetermined current value from the starting power, and then until the output power of the DC-DC converter reaches the predetermined value. , a discharge lamp lighting device that controls the output power of a DC-DC converter to decrease by a constant amount of power every unit time.

【0009】(2)DC−DCコンバータの出力電圧を
検出する出力電圧検出手段を有し、制御手段は、始動の
際、点灯を検知するまで、前記電圧検出手段の出力に応
じて前記DC−DCコンバータの出力電圧が一定になる
ように制御するものである前記(1)記載の放電灯点灯
装置。
(2) It has an output voltage detection means for detecting the output voltage of the DC-DC converter, and the control means controls the DC-DC voltage according to the output of the voltage detection means until lighting is detected at the time of starting. The discharge lamp lighting device according to (1) above, which controls the output voltage of the DC converter to be constant.

【0010】0010

【作用】前記(1),(2)の構成によれば、始動の際
、点灯からランプ電圧が第1の所定値になるまでは、放
電ランプに定格電力の数倍の始動電力が供給され、その
後ランプ電圧が第2の所定値になる間では、“始動電力
−K(所定電流)・ランプ電圧”の電力が供給され、そ
の後DC−DCコンバータの出力電力が所定の値になる
までは、単位時間毎に一定電力だけ逓減する電力が供給
される。
[Operation] According to the configurations (1) and (2) above, upon starting, starting power several times the rated power is supplied to the discharge lamp from lighting until the lamp voltage reaches the first predetermined value. After that, while the lamp voltage reaches the second predetermined value, the power equal to "starting power - K (predetermined current)/lamp voltage" is supplied, and thereafter until the output power of the DC-DC converter reaches the predetermined value. , power is supplied that decreases by a constant amount per unit time.

【0011】(2)の構成では、更に始動の際、点灯す
るまでは、DC−DCコンバータの出力電圧は一定に維
持される。
[0011] In the configuration (2), the output voltage of the DC-DC converter is maintained constant until the light is turned on at the time of starting.

【0012】0012

【実施例】以下この発明を実施例により詳しく説明する
。図1は一実施例である“放電灯点灯装置”のブロック
図、図2,図3は本実施例の動作説明図、図4は本実施
例の動作を示すフローチャート、図5は本実施例におけ
る、経過時間と光出力の関係を示す図である。
[Examples] The present invention will be explained in detail with reference to Examples below. FIG. 1 is a block diagram of a "discharge lamp lighting device" which is an embodiment, FIGS. 2 and 3 are diagrams explaining the operation of this embodiment, FIG. 4 is a flowchart showing the operation of this embodiment, and FIG. 5 is a flowchart showing the operation of this embodiment. It is a figure showing the relationship between elapsed time and light output in .

【0013】図1において、1は直流電源、2は出力電
圧,出力電力可変のDC−DCコンバータ、4はDC−
DCコンバータ2の出力電力を検出する電力検出回路、
5はDC−DCコンバータ4の出力を交流に変換するイ
ンバータ、6はランプ電流を制限するチョークコイル(
インダクタ)、7はランプ電圧及びランプ電流を検出す
るランプ状態検出回路、8は放電ランプである。10は
始動時に共振回路で発生した高電圧を放電ランプ8に印
加し封入ガスの絶縁破壊を行う高圧発生回路である。
In FIG. 1, 1 is a DC power supply, 2 is a DC-DC converter with variable output voltage and output power, and 4 is a DC-DC converter.
a power detection circuit that detects the output power of the DC converter 2;
5 is an inverter that converts the output of the DC-DC converter 4 into alternating current; 6 is a choke coil that limits the lamp current (
7 is a lamp state detection circuit for detecting lamp voltage and lamp current, and 8 is a discharge lamp. Reference numeral 10 denotes a high voltage generating circuit that applies a high voltage generated in a resonant circuit to the discharge lamp 8 at the time of starting, thereby causing dielectric breakdown of the filled gas.

【0014】3は、電力検出回路4からDC−DCコン
バータ2の出力電力及び出力電圧の情報を、またランプ
状態検出回路7からランプ電圧及びランプ電流の情報を
入力し、DC−DCコンバータ2の出力電力また出力電
圧を制御する制御回路である。
3 inputs information on the output power and output voltage of the DC-DC converter 2 from the power detection circuit 4 and information on the lamp voltage and lamp current from the lamp state detection circuit 7, and This is a control circuit that controls output power or output voltage.

【0015】以下図2ないし図4により動作を説明する
。不図示のライトスイッチがオンすると、制御回路3は
、電力検出回路4の電圧情報にもとづいて図2に示すよ
うに、DC−DCコンバータ2の出力電圧が一定になる
ように制御する(図4のS1参照)。このとき高圧発生
回路10は放電ランプ8に高電圧を供給するので、放電
ランプ8の封入ガスは絶縁破壊を起し、点灯する。制御
回路3は、この点灯によるランプ電流をランプ状態検出
回路7で検出すると(S2,NO)、電力検出回路4の
電力情報にもとづいて、DC−DCコンバータ2の出力
電力が放電ランプ8の定格電力の数倍である始動電力(
最大電力を越えない値)になるように制御する(図3A
期間参照,S3)。制御回路3は、ランプ電圧が第1の
所定値VL1を越えるのをランプ状態検出回路8で検出
すると(S4,YES)、その後電力検出回路4の電力
情報及びランプ状態検出回路7の電圧情報にもとづいて
、DC−DCコンバータ2の出力電力が(前記始動電力
−K・ランプ電圧)値になるように制御し(図3B期間
参照,S5)、更にランプ電圧が上昇し第2の所定値V
L2を越えるのをランプ状態検出回路8で検出すると(
S6,YES)、その後DC−DCコンバータ2の出力
電圧が単位時間毎に一定値だけ減少するよう制御し(図
3C期間参照,S7,S8)、定格電力になったことを
電力検出回路4で検出すると(S9,YES)、その後
定格電力を維持するよう制御する(図3D期間参照,S
10)。
The operation will be explained below with reference to FIGS. 2 to 4. When a light switch (not shown) is turned on, the control circuit 3 controls the output voltage of the DC-DC converter 2 to be constant as shown in FIG. 2 based on voltage information from the power detection circuit 4 (see FIG. 4). (See S1). At this time, the high voltage generating circuit 10 supplies a high voltage to the discharge lamp 8, so that the gas filled in the discharge lamp 8 causes dielectric breakdown and is turned on. When the lamp state detection circuit 7 detects the lamp current caused by this lighting (S2, NO), the control circuit 3 determines that the output power of the DC-DC converter 2 is equal to the rated power of the discharge lamp 8 based on the power information of the power detection circuit 4. The starting power, which is several times the electric power (
(Figure 3A)
See period, S3). When the lamp state detection circuit 8 detects that the lamp voltage exceeds the first predetermined value VL1 (S4, YES), the control circuit 3 then uses the power information of the power detection circuit 4 and the voltage information of the lamp state detection circuit 7. Based on this, the output power of the DC-DC converter 2 is controlled to the value of (the starting power - K·lamp voltage) (see period B in FIG. 3, S5), and the lamp voltage further increases to a second predetermined value V.
When the lamp state detection circuit 8 detects that L2 is exceeded (
After that, the output voltage of the DC-DC converter 2 is controlled to decrease by a fixed value every unit time (see period C in FIG. 3, S7, S8), and the power detection circuit 4 detects that the rated power has been reached. When detected (S9, YES), control is performed to maintain the rated power (see period in Figure 3D, S
10).

【0016】図3に示すように、DC−DCコンバータ
2の出力電力即ち放電ランプ8への供給電力を制御する
のは、つぎの理由による。ランプ電圧が第1の所定値V
L1になると、光出力が立ち上がり、以後光出力はラン
プ電圧の関数となるのでランプ電圧に応じて出力電力を
制御する。ランプ電圧が第2の所定値VL2になると、
光出力は定格に近づき、ランプ電圧の変化がゆるやかに
なるので、ランプ電圧のかわりに時間経過に応じて出力
電圧を制御する。
The reason why the output power of the DC-DC converter 2, that is, the power supplied to the discharge lamp 8 is controlled as shown in FIG. 3 is as follows. The lamp voltage is the first predetermined value V
At L1, the optical output rises, and thereafter the optical output becomes a function of the lamp voltage, so the output power is controlled according to the lamp voltage. When the lamp voltage reaches the second predetermined value VL2,
Since the light output approaches the rated value and the lamp voltage changes slowly, the output voltage is controlled over time instead of the lamp voltage.

【0017】本実施例では、DC−DCコンバータ2の
出力電力を以上のように制御しているので、図5に示す
ように、光出力は点灯後直ちに略一定値に安定する。ま
た、始動の際点灯するまで、DC−DCコンバータ2の
出力電圧を一定に制御しているので、直流電源1の電圧
変動にかかわらず、高圧発生回路10に安定した高電圧
が得られ、点灯が確実となる。
In this embodiment, since the output power of the DC-DC converter 2 is controlled as described above, the optical output stabilizes at a substantially constant value immediately after lighting, as shown in FIG. In addition, since the output voltage of the DC-DC converter 2 is controlled to be constant until the light turns on at startup, a stable high voltage can be obtained in the high voltage generation circuit 10 regardless of voltage fluctuations in the DC power supply 1, and the light turns on. becomes certain.

【0018】なお、実施例では点灯をランプ電流で検出
しているが、ランプ電圧により検出してもよい。
In the embodiment, lighting is detected using the lamp current, but it may also be detected using the lamp voltage.

【0019】[0019]

【発明の効果】以上説明したように、この発明によれば
、始動の際に光出力が短時間で安定化する。また、請求
項2の発明では、更に直流電源の電圧変動にかかわらず
、確実に点灯する。
As described above, according to the present invention, the optical output is stabilized in a short time at the time of starting. Furthermore, in the invention of claim 2, the light is reliably lit regardless of voltage fluctuations of the DC power supply.

【図面の簡単な説明】[Brief explanation of drawings]

【図1】実施例のブロック図[Figure 1] Block diagram of the embodiment

【図2】実施例におけるDC−DCコンバータの点灯前
後の経過時間と出力電圧の関係を示す図
[Fig. 2] A diagram showing the relationship between the elapsed time before and after lighting of the DC-DC converter and the output voltage in the example

【図3】実施例
におけるDC−DCコンバータの経過時間と出力電力の
関係を示す図
[Fig. 3] A diagram showing the relationship between elapsed time and output power of the DC-DC converter in the example.

【図4】実施例の動作を示すフローチャート[Figure 4] Flowchart showing the operation of the embodiment

【図5】実
施例の経過時間と光出力の関係を示す図
[Figure 5] Diagram showing the relationship between elapsed time and light output in the example

【図6】従来例
のブロック図
[Figure 6] Block diagram of conventional example

【図7】従来例の経過時間と光出力の関係を示す図[Figure 7] Diagram showing the relationship between elapsed time and light output in the conventional example

【符号の説明】[Explanation of symbols]

2    DC−DCコンバータ 3    制御回路 4    電力検出回路 5    インバータ 6    チョークコイル 7    ランプ状態検出回路 8    放電ランプ 2 DC-DC converter 3 Control circuit 4 Power detection circuit 5 Inverter 6 Choke coil 7 Lamp status detection circuit 8 Discharge lamp

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】  DC−DCコンバータと、該DC−D
Cコンバータの出力側に接続されたインバータと、該イ
ンバータの出力側に直列接続されたインダクタ及び負荷
放電ランプの接続される出力端と、前記DC−DCコン
バータの出力電力を検出する出力電力検出手段と、前記
負荷放電ランプのランプ電圧及びランプ電流を検出する
ランプ状態検出手段と、前記出力電力検出手段の出力及
び前記ランプ状態検出手段の出力を入力し、前記DC−
DCコンバータの出力電力を制御する制御手段とを備え
た放電灯点灯装置であって、前記制御手段は、ランプ電
圧またランプ電流により点灯を検知し、その後ランプ電
圧が第1の所定値になるまで、前記DC−DCコンバー
タの出力電力が定格電力の数倍の始動電力になるよう制
御し、その後ランプ電圧が第2の所定値になるまで、D
C−DCコンバータの出力電力が、該始動電力からラン
プ電圧に所定電流値をかけた値の電力を差引いた値にな
るよう制御し、その後DC−DCコンバータの出力電力
が所定の値になるまで、DC−DCコンバータの出力電
力が単位時間毎に一定電力だけ減少するよう制御するも
のであることを特徴とする放電灯点灯装置。
[Claim 1] A DC-DC converter and the DC-D
an inverter connected to the output side of the C converter; an inductor connected in series to the output side of the inverter; and an output end to which the load discharge lamp is connected; and output power detection means for detecting the output power of the DC-DC converter. and a lamp state detecting means for detecting the lamp voltage and lamp current of the load discharge lamp; the output of the output power detecting means and the output of the lamp state detecting means are input;
A discharge lamp lighting device comprising a control means for controlling output power of a DC converter, wherein the control means detects lighting based on lamp voltage or lamp current, and then controls the lamp voltage until the lamp voltage reaches a first predetermined value. , the output power of the DC-DC converter is controlled to be a starting power several times the rated power, and then D is controlled until the lamp voltage reaches a second predetermined value.
The output power of the C-DC converter is controlled to be the value obtained by subtracting the power equal to the lamp voltage multiplied by a predetermined current value from the starting power, and then the output power of the DC-DC converter is controlled until the output power of the DC-DC converter reaches the predetermined value. A discharge lamp lighting device, characterized in that the output power of the DC-DC converter is controlled to decrease by a constant amount of power every unit time.
【請求項2】  DC−DCコンバータの出力電圧を検
出する出力電圧検出手段を有し、制御手段は、始動の際
、点灯を検知するまで、前記電圧検出手段の出力に応じ
て前記DC−DCコンバータの出力電圧が一定になるよ
うに制御するものであることを特徴とする請求項1記載
の放電灯点灯装置。
2. An output voltage detection means for detecting the output voltage of the DC-DC converter, and the control means controls the DC-DC voltage according to the output of the voltage detection means until lighting is detected at the time of starting. 2. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device controls the output voltage of the converter to be constant.
JP3115941A 1991-05-21 1991-05-21 Discharge lamp lighting device Expired - Lifetime JP2982373B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3115941A JP2982373B2 (en) 1991-05-21 1991-05-21 Discharge lamp lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3115941A JP2982373B2 (en) 1991-05-21 1991-05-21 Discharge lamp lighting device

Publications (2)

Publication Number Publication Date
JPH04342993A true JPH04342993A (en) 1992-11-30
JP2982373B2 JP2982373B2 (en) 1999-11-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2982373B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5463287A (en) * 1993-10-06 1995-10-31 Tdk Corporation Discharge lamp lighting apparatus which can control a lighting process
JPH11162685A (en) * 1997-11-28 1999-06-18 Mitsubishi Electric Corp High-pressure discharge-lamp lighting device
JPH11508401A (en) * 1996-04-18 1999-07-21 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ Circuit assembly
WO2003022014A1 (en) * 2001-08-29 2003-03-13 Harison Toshiba Lighting Corp. High-voltage discharge lamp lighting apparatus and automobile headlight apparatus
WO2005081589A1 (en) * 2004-02-24 2005-09-01 Matsushita Electric Works, Ltd. Discharge lamp operation device and projector
JP2008021661A (en) * 2002-03-11 2008-01-31 Denso Corp Discharge lamp device
JP2008034395A (en) * 2002-03-11 2008-02-14 Denso Corp Discharge lamp device
JP2008034396A (en) * 2002-03-11 2008-02-14 Denso Corp Discharge lamp device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5463287A (en) * 1993-10-06 1995-10-31 Tdk Corporation Discharge lamp lighting apparatus which can control a lighting process
JPH11508401A (en) * 1996-04-18 1999-07-21 フィリップス エレクトロニクス ネムローゼ フェンノートシャップ Circuit assembly
JPH11162685A (en) * 1997-11-28 1999-06-18 Mitsubishi Electric Corp High-pressure discharge-lamp lighting device
WO2003022014A1 (en) * 2001-08-29 2003-03-13 Harison Toshiba Lighting Corp. High-voltage discharge lamp lighting apparatus and automobile headlight apparatus
US6850015B2 (en) 2001-08-29 2005-02-01 Harison Toshiba Lighting Corp. High pressure discharge lamp starter device and an automotive headlight device
JP2008021661A (en) * 2002-03-11 2008-01-31 Denso Corp Discharge lamp device
JP2008034395A (en) * 2002-03-11 2008-02-14 Denso Corp Discharge lamp device
JP2008034396A (en) * 2002-03-11 2008-02-14 Denso Corp Discharge lamp device
JP4596187B2 (en) * 2002-03-11 2010-12-08 株式会社デンソー Discharge lamp equipment
JP4596188B2 (en) * 2002-03-11 2010-12-08 株式会社デンソー Discharge lamp equipment
JP4656117B2 (en) * 2002-03-11 2011-03-23 株式会社デンソー Discharge lamp equipment
WO2005081589A1 (en) * 2004-02-24 2005-09-01 Matsushita Electric Works, Ltd. Discharge lamp operation device and projector
US7622869B2 (en) 2004-02-24 2009-11-24 Panasonic Electric Works Co., Ltd. Discharge lamp ballast and projector

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