JP5103641B2 - High pressure discharge lamp lighting device - Google Patents

High pressure discharge lamp lighting device Download PDF

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JP5103641B2
JP5103641B2 JP2007118321A JP2007118321A JP5103641B2 JP 5103641 B2 JP5103641 B2 JP 5103641B2 JP 2007118321 A JP2007118321 A JP 2007118321A JP 2007118321 A JP2007118321 A JP 2007118321A JP 5103641 B2 JP5103641 B2 JP 5103641B2
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discharge lamp
pressure discharge
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voltage
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JP2008277083A (en
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正幸 小林
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Iwasaki Denki KK
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Description

本発明は高圧放電灯を点灯させるための高圧放電灯点灯装置の改良に関する。   The present invention relates to an improvement of a high pressure discharge lamp lighting device for lighting a high pressure discharge lamp.

近年、高圧放電灯点灯装置の電子化による小型、軽量化が進み図２に示すような降圧チョッパ回路２０とフルブリッジ回路３０、およびイグナイタ回路４０の組合せにより高圧放電灯５０を高周波始動させ、その後、低周波の矩形波で安定に点灯させる高圧放電灯点灯装置が普及しつつある。   In recent years, the high pressure discharge lamp lighting device has become smaller and lighter due to the digitization, and the high pressure discharge lamp 50 is started at a high frequency by the combination of the step-down chopper circuit 20, the full bridge circuit 30, and the igniter circuit 40 as shown in FIG. High-pressure discharge lamp lighting devices that are stably lit with a low-frequency rectangular wave are becoming widespread.

図２の従来回路の動作を説明すると、降圧チョッパ回路２０を構成するＰＷＭ制御回路２８の制御方式は、抵抗２７によりランプ電流に比例したランプ電流信号を、抵抗２６によりランプ電圧に比例したランプ電圧信号を検出し、ランプ電流信号とランプ電圧信号を乗算器にて乗算した電圧信号、またはマイコンにて演算した電圧信号と、予め高圧放電灯５０の定格ランプ電圧時に定格ランプ電力で点灯できるようにし設定した基準電圧とを誤差増幅器にて比較し、ランプ電流信号とランプ電圧信号を乗算した電圧信号、またはマイコンにて演算した電圧信号が一定になるようにトランジスタ２１のデューティ比をパルス幅制御し、高圧放電灯５０を適正な電力にて点灯させるものである（例えば、特許文献１）。   The operation of the conventional circuit of FIG. 2 will be described. The control method of the PWM control circuit 28 constituting the step-down chopper circuit 20 is such that a lamp 27 is proportional to the lamp current by a resistor 27 and a lamp voltage is proportional to the lamp voltage by a resistor 26. The signal is detected so that the lamp current signal and the lamp voltage signal are multiplied by a multiplier, or a voltage signal calculated by a microcomputer, and the high-pressure discharge lamp 50 can be lit at the rated lamp power in advance at the rated lamp voltage. The set reference voltage is compared with the error amplifier, and the duty ratio of the transistor 21 is controlled in pulse width so that the voltage signal obtained by multiplying the lamp current signal and the lamp voltage signal or the voltage signal calculated by the microcomputer becomes constant. The high-pressure discharge lamp 50 is lit with appropriate power (for example, Patent Document 1).

次に降圧チョッパ回路２０の制限された直流出力を受けて動作するフルブリッジ回路３０の動作は、トランジスタ３１及び３４とトランジスタ３２及び３３がブリッジ制御回路３５にて制御される周波数にて交互に導通・非導通を繰り返すことにより、降圧チョッパ回路２０の直流出力を交流電流に変換し、高圧放電灯５０に供給するものである。   Next, the operation of the full bridge circuit 30 which operates by receiving the limited DC output of the step-down chopper circuit 20 is alternately conducted at a frequency at which the transistors 31 and 34 and the transistors 32 and 33 are controlled by the bridge control circuit 35. -By repeating non-conduction, the DC output of the step-down chopper circuit 20 is converted into an AC current and supplied to the high-pressure discharge lamp 50.

ここで高圧放電灯５０の始動時においては、一定時間、ブリッジ制御回路３５で制御される周波数を数十ｋＨｚに高めることにより、トランジスタ３１及び３４とトランジスタ３２及び３３の中点に接続されたチョークコイル３６とコンデンサ３７の直列回路が共振し、チョークコイル３６のインダクタンスとコンデンサ３７の容量とブリッジ制御回路３５の周波数で決まる正弦波の周波数の高い共振電圧がチョークコイル３６およびコンデンサ３７端に発生し、コンデンサ３７に並列に接続されている高圧放電灯５０端にも、その高周波の共振電圧が印加される。   Here, when starting the high-pressure discharge lamp 50, the choke connected to the midpoints of the transistors 31 and 34 and the transistors 32 and 33 is increased by increasing the frequency controlled by the bridge control circuit 35 to several tens of kHz for a certain period of time. The series circuit of the coil 36 and the capacitor 37 resonates, and a resonance voltage having a high sine wave frequency determined by the inductance of the choke coil 36, the capacitance of the capacitor 37, and the frequency of the bridge control circuit 35 is generated at the ends of the choke coil 36 and the capacitor 37. The high-frequency resonance voltage is also applied to the end of the high-pressure discharge lamp 50 connected in parallel to the capacitor 37.

次に高圧放電灯５０を始動させるためのイグナイタ回路４０の動作は、先に説明したブリッジ制御回路３５によりブリッジ回路が数十ｋＨｚの高周波で動作しているときのコンデンサ３７端に発生する高周波の正弦波電圧を受け、チョークコイル３６とコンデンサ３７の接続点側がプラス電位のときにダイオード４１、抵抗４３、コンデンサ４５の向きに電流が流れコンデンサ４５が充電される。高周波の正弦波電圧の極性が反転し、チョークコイル３６とコンデンサ３７の接続点がマイナス電位のときはコンデンサ４６、抵抗４４、ダイオード４２の向きに電流が流れコンデンサ４６が充電される。   Next, the operation of the igniter circuit 40 for starting the high pressure discharge lamp 50 is performed by the high frequency generated at the end of the capacitor 37 when the bridge circuit is operating at a high frequency of several tens of kHz by the bridge control circuit 35 described above. When a sine wave voltage is received and the connection point side of the choke coil 36 and the capacitor 37 has a positive potential, a current flows in the direction of the diode 41, the resistor 43, and the capacitor 45, and the capacitor 45 is charged. When the polarity of the high-frequency sine wave voltage is reversed and the connection point between the choke coil 36 and the capacitor 37 is a negative potential, a current flows in the direction of the capacitor 46, the resistor 44, and the diode 42, and the capacitor 46 is charged.

上記動作を繰り返すことにより、コンデンサ４５とコンデンサ４６の直列回路端の電位は徐々に上昇していくが、一般的にはコンデンサ３７端に発生する電圧は図３に示すようにチョークコイル３６のインダクタンスとコンデンサ３７の容量で決まる共振周波数ｆ０の時が最大で、周波数ｆ１におけるコンデンサ３７の電圧（ａ）を供給し続けた時に、コンデンサ４５とコンデンサ４６の直列回路端の電位が放電ギャップ４８のブレークダウン電圧Ｖ０に達するとすると、コンデンサ４５、４６の直列回路より放電ギャップ４８、パルストランス４７の一次巻線に電流が流れパルストランス４７の一次巻線にコンデンサ４５、４６の電圧が印加されることになる。 By repeating the above operation, the potential at the end of the series circuit of the capacitor 45 and the capacitor 46 gradually increases. Generally, the voltage generated at the end of the capacitor 37 is the inductance of the choke coil 36 as shown in FIG. And the resonance frequency f 0 determined by the capacitance of the capacitor 37 is the maximum, and when the voltage (a) of the capacitor 37 at the frequency f 1 is continuously supplied, the potential at the end of the series circuit of the capacitor 45 and the capacitor 46 becomes the discharge gap 48. When the reach the breakdown voltage V 0, the series circuit from the discharge gap 48, the primary winding of the pulse transformer 47 current flows in the primary winding of the pulse transformer 47 the voltage of the capacitor 45 and 46 to apply a capacitor 45 Will be.

このことにより、パルストランス４７の二次巻線には、一次巻線に印加された電圧に対してパルストランス４７の昇圧比に応じたパルス電圧が発生し、その電圧はコンデンサ３７を介して高圧放電灯５０に印加されるため高圧放電灯５０が、そのパルス電圧により絶縁破壊をして放電を開始する。   As a result, a pulse voltage corresponding to the step-up ratio of the pulse transformer 47 is generated in the secondary winding of the pulse transformer 47 with respect to the voltage applied to the primary winding. Since the voltage is applied to the discharge lamp 50, the high-pressure discharge lamp 50 breaks down by the pulse voltage and starts discharging.

しかし、実使用上においてはチョークコイル３６のインダクタンスとコンデンサ３７の容量には、それぞれバラツキがあり、かつ高圧放電灯点灯装置と高圧放電灯５０を接続する電線のインダクタンスと容量も、この共振に影響を及ぼすため、図４に示したように、実使用においては本来の共振周波数ｆ０はｆ０’へ移行したりｆ０”へ移行したりしてしまう。そのため、本来は放電ギャップ４８がブレークダウンできる周波数ｆ１でのコンデンサ３７の電圧ａもａ’、ａ”となり、一定の周波数ｆ１では放電ギャップ４８を安定してブレークダウンさせることができない場合もある。 However, in actual use, the inductance of the choke coil 36 and the capacity of the capacitor 37 vary, and the inductance and capacity of the wire connecting the high pressure discharge lamp lighting device and the high pressure discharge lamp 50 also affect this resonance. Therefore, as shown in FIG. 4, in actual use, the original resonance frequency f 0 shifts to f 0 ′ or f 0 ″. Therefore, the discharge gap 48 is originally broken. the voltage a of the capacitor 37 at the frequency f 1 which can be down a ', a ", and the may not be able to stabilize break down a certain frequency f 1 in the discharge gap 48.

また、図５で示すように放電ギャップ４８も、そのブレークダウン電圧の中心値ａに対し実際はａ＋〜ａ−の範囲でバラツキがあるため、仮に周波数ｆ１でのコンデンサ３７端の電圧が一定であったとしても、安定して放電ギャップ４８をブレークダウンさせることができない場合もある。 Further, as shown in FIG. 5, the discharge gap 48 also varies in the range of a + to a − with respect to the center value a of the breakdown voltage, so that the voltage at the end of the capacitor 37 at the frequency f 1 is constant. Even in such a case, the discharge gap 48 may not be broken down stably.

そのため、従来例の回路では図６に示すようにブリッジ制御回路３５の周波数をコンデンサ３７端に発生する電圧が低いｆstartで動作を開始し、時間と共に周波数を変化させることによりコンデンサ３７端の電圧を徐々に高め、チョークコイル３６、コンデンサ３７の共振条件や放電ギャップ４８のブレークダウン電圧にバラツキがあっても、確実に放電ギャップ４８を安定してブレークダウンできるようにしている。 Therefore, in the circuit of the conventional example, as shown in FIG. 6, the operation of the bridge control circuit 35 starts at fstart where the voltage generated at the end of the capacitor 37 is low, and the voltage at the end of the capacitor 37 is changed by changing the frequency with time. The discharge gap 48 can be reliably and stably broken down even if there is variation in the resonance conditions of the choke coil 36 and the capacitor 37 and the breakdown voltage of the discharge gap 48.

また、放電ギャップ４８がブレークダウンした後も、周波数を変化させると高圧放電灯５０が放電を開始するまではコンデンサ３７端に発生する電圧は必要以上に高くなってしまうため、放電ギャップ４８がブレークダウンした時点で図７に示すようにブリッジ制御回路３５の周波数を固定にし、安定したブレークダウンを繰り返すことを可能にしている。   Even after the discharge gap 48 breaks down, if the frequency is changed, the voltage generated at the end of the capacitor 37 becomes higher than necessary until the high-pressure discharge lamp 50 starts discharging. At the time of down, the frequency of the bridge control circuit 35 is fixed as shown in FIG. 7, and stable breakdown can be repeated.

次に、高圧放電灯５０が放電を開始した直後においても一定時間、ブリッジ制御回路３５よりブリッジ回路３０を、高周波にて動作することにより、降圧チョッパ回路２０に加え、チョークコイル３６も限流素子となり、制限された電流にて高圧放電灯５０は高周波点灯を開始する。   Next, by operating the bridge circuit 30 at a high frequency from the bridge control circuit 35 for a certain period of time immediately after the high-pressure discharge lamp 50 starts discharging, the choke coil 36 is added to the step-down chopper circuit 20 and the current limiting element. Thus, the high-pressure discharge lamp 50 starts high-frequency lighting with the limited current.

そして一定時間経過後にブリッジ制御回路３５によりブリッジ回路を数十〜数百Ｈｚにて動作させることにより、高圧放電灯５０は高周波点灯から低周波の矩形波点灯に移行し安定した放電を維持する。   Then, when the bridge control circuit 35 operates the bridge circuit at several tens to several hundreds of Hz after a predetermined time has elapsed, the high pressure discharge lamp 50 shifts from high frequency lighting to low frequency rectangular wave lighting and maintains stable discharge.

また、この時チョークコイル３６とコンデンサ３７は高圧放電灯５０に流れる、チョッパ回路２０のスイッチング動作により発生するリップル電流を低減させるためのフィルタ回路の役割も担っている。
特開２００４−９５３３４号公報 At this time, the choke coil 36 and the capacitor 37 also serve as a filter circuit for reducing the ripple current generated by the switching operation of the chopper circuit 20 that flows to the high-pressure discharge lamp 50.
JP 2004-95334 A

ところで、上述したように、従来の高圧放電灯点灯装置のイグナイタ回路４０は、ブリッジ回路３０の周波数をｆstartから時間と共に高めていく制御をすることにより、コンデンサ３７端の電圧も徐々に高くなる方向で変化していくため、共振条件や放電ギャップ個々のブレークダウン電圧にバラツキがあっても確実に放電ギャップ４８をブレークダウンさせることは可能である。 By the way, as described above, the igniter circuit 40 of the conventional high pressure discharge lamp lighting device performs control to increase the frequency of the bridge circuit 30 with time from fstart , so that the voltage at the end of the capacitor 37 gradually increases. Since it changes in the direction, it is possible to reliably break down the discharge gap 48 even if the resonance conditions and the breakdown voltage of each discharge gap vary.

しかし、放電ギャップ４８がブレークダウンする電圧は、最初にブレークダウンするときに通常のブレークダウン電圧Ｖ０とくらべて著しく低くなったり、高くなったりすることがある。
最初のブレークダウン電圧が低くなると、図８に示すようにフルブリッジ回路の動作周波数もそのまま維持されるため、コンデンサ３７端の電圧も低くなり、そのためコンデンサ４５−４６端の電圧も通常時よりゆっくりと上昇するために、放電ギャップ４８がブレークダウンする回数が少なくなり、または最悪ブレークダウンできなくなってしまう。そのため高圧放電灯５０の始動性が悪くなったり、始動しなくなったりしてしまう。
また、最初のブレークダウン電圧が高くなると、図９に示すように、放電ギャップ４８のブレークダウン回数が著しく多くなり、放電ギャップ４８の寿命が短くなってしまう。 However, the voltage discharge gap 48 breaks down, or initially significantly lower than the normal breakdown voltage V 0 when the breakdown, which may or higher.
When the initial breakdown voltage is lowered, the operating frequency of the full bridge circuit is maintained as it is as shown in FIG. 8, so that the voltage at the capacitor 37 is also lowered, and therefore the voltage at the capacitors 45-46 is also slower than usual. Therefore, the number of times that the discharge gap 48 breaks down decreases, or the worst breakdown cannot be performed. For this reason, the startability of the high-pressure discharge lamp 50 is deteriorated or the start is not started.
Further, when the initial breakdown voltage is increased, the number of breakdowns of the discharge gap 48 is remarkably increased as shown in FIG. 9, and the life of the discharge gap 48 is shortened.

上記問題点を解決するための本発明第１の側面は、直流電源からの出力を受け高圧放電灯へ電力を供給する降圧チョッパ回路と、降圧チョッパ回路の出力を高周波および低周波の交流出力に変換して高圧放電灯に供給するフルブリッジ回路と、フルブリッジ回路の高周波電圧出力を受けて高圧放電灯を始動させるためのパルス電圧を発生するイグナイタ回路からなる高圧放電灯点灯装置において、イグナイタ回路のパルス電圧の所定時間当たりの発生数を検出するパルス電圧発生数検出回路を備えた高圧放電灯点灯装置である。   A first aspect of the present invention for solving the above problems is a step-down chopper circuit that receives an output from a DC power source and supplies electric power to a high-pressure discharge lamp, and outputs the step-down chopper circuit to high-frequency and low-frequency AC outputs. An igniter circuit in a high-pressure discharge lamp lighting device comprising a full-bridge circuit that converts and supplies a high-voltage discharge lamp to a high-voltage discharge lamp that receives a high-frequency voltage output from the full-bridge circuit and generates a pulse voltage for starting the high-pressure discharge lamp It is a high pressure discharge lamp lighting device provided with the pulse voltage generation number detection circuit which detects the generation number of the pulse voltage per predetermined time.

上記第１の側面において、フルブリッジ回路のスイッチング動作により高周波電圧出力を発生する共振回路を備え、パルス電圧発生数検出回路が検出した所定時間当たりのパルス電圧発生数が所定のパルス発生数よりも少なかった場合に、フルブリッジ回路の動作周波数を変化させて高周波電圧出力を高くするよう構成した。   In the first aspect, a resonance circuit that generates a high-frequency voltage output by a switching operation of a full bridge circuit is provided, and the number of pulse voltage generations per predetermined time detected by the pulse voltage generation number detection circuit is greater than the predetermined number of pulse generations. In the case where there are few, the operation frequency of the full bridge circuit is changed to increase the high frequency voltage output.

上記第１の側面において、フルブリッジ回路のスイッチング動作により高周波電圧出力を発生する共振回路を備え、パルス電圧発生数検出回路が検出した所定時間当たりのパルス電圧発生数が所定のパルス発生数よりも多かった場合に、フルブリッジ回路の動作周波数を変化させて高周波電圧出力を低くするよう構成した。   In the first aspect, a resonance circuit that generates a high-frequency voltage output by a switching operation of a full bridge circuit is provided, and the number of pulse voltage generations per predetermined time detected by the pulse voltage generation number detection circuit is greater than the predetermined number of pulse generations. When there were many, it was comprised so that the operating frequency of a full bridge circuit might be changed and a high frequency voltage output might be made low.

本発明第２の側面は、上記第１の側面の高圧放電灯点灯装置、高圧放電灯、高圧放電灯が取り付けられるレフレクタ、及び少なくとも高圧放電灯点灯装置を内包する筐体を備えた光源装置である。   According to a second aspect of the present invention, there is provided a light source device including the high pressure discharge lamp lighting device, the high pressure discharge lamp, the reflector to which the high pressure discharge lamp is attached, and a housing containing at least the high pressure discharge lamp lighting device. is there.

本発明の高圧放電灯点灯装置によれば、放電ギャップの最初のブレークダウン電圧が通常時より著しく変動しても、高圧放電灯の始動不良や放電ギャップの短寿命といった不具合を防止できる。   According to the high pressure discharge lamp lighting device of the present invention, even if the initial breakdown voltage of the discharge gap varies significantly from the normal time, it is possible to prevent problems such as a defective start of the high pressure discharge lamp and a short life of the discharge gap.

次に、実施の形態について説明する。図１は本発明に係る高圧放電灯点灯装置の実施の形態を示す回路構成図で、図２に示した従来例のものと同一または対応する部材については、同一の番号を付して、その説明を省略する。
本発明に係る高圧放電灯点灯装置において従来例と異なる点は次の通りである。すなわち、イグナイタ回路４０にパルス発生数検知回路４９１を設け、パルス発生数検出回路の検出結果によって、フルブリッジ制御回路の動作を制御できるようにしたことである。 Next, embodiments will be described. FIG. 1 is a circuit configuration diagram showing an embodiment of a high pressure discharge lamp lighting device according to the present invention. The same or corresponding members as those in the conventional example shown in FIG. Description is omitted.
The high pressure discharge lamp lighting device according to the present invention is different from the conventional example as follows. In other words, the igniter circuit 40 is provided with a pulse generation number detection circuit 491 so that the operation of the full bridge control circuit can be controlled by the detection result of the pulse generation number detection circuit.

その動作は、放電ギャップ４８の最初のブレークダウン電圧が低くなってしまった場合、イグナイタ回路４０の所定時間当たりのパルス発生数が規定値範囲より低下したことを、パルス発生数検知回路４９１が検知し、フルブリッジ回路の動作周波数を高くして、コンデンサ３７端の電圧を上昇させることにより、イグナイタ回路４０のパルス発生数を規定値範囲に上昇させる。このときのコンデンサ３７端の電圧の変化とギャップ４８端の電圧変化を図１０に示す。   In the operation, when the initial breakdown voltage of the discharge gap 48 becomes low, the pulse generation number detection circuit 491 detects that the number of pulses generated per predetermined time of the igniter circuit 40 has fallen below the specified value range. Then, by increasing the operating frequency of the full bridge circuit and increasing the voltage at the capacitor 37 end, the number of pulses generated in the igniter circuit 40 is increased to a specified value range. FIG. 10 shows a change in voltage at the capacitor 37 end and a voltage change at the gap 48 end at this time.

また、放電ギャップ４８の最初のブレークダウン電圧が高くなってしまった場合は、イグナイタ回路４０の所定時間当たりのパルス発生数が規定値範囲より多くなったことを、パルス発生数検知回路４９１が検知し、フルブリッジ回路の動作周波数を低くすることによって、コンデンサ３７端の電圧を低下させ、イグナイタ回路４０のパルス発生数を規定値範囲にする。このときのコンデンサ３７端の電圧の変化とギャップ４８端の電圧変化を図１１に示す。   Further, when the initial breakdown voltage of the discharge gap 48 becomes high, the pulse generation number detection circuit 491 detects that the number of pulses generated per predetermined time of the igniter circuit 40 has exceeded the specified value range. Then, by lowering the operating frequency of the full bridge circuit, the voltage at the end of the capacitor 37 is lowered, and the number of pulses generated in the igniter circuit 40 falls within the specified value range. FIG. 11 shows a change in voltage at the capacitor 37 end and a voltage change at the gap 48 end at this time.

なお従来例および実施例において、フルブリッジ回路の動作周波数を高くすると共振電圧が高くなると説明しているが、図３のｆ０より高周波側の共振電圧カーブを用いて、周波数を下げると共振電圧が高くなるようにしてもよい。 Note in the conventional example and embodiment is described with a higher operating frequency of the full bridge circuit and the resonance voltage increases, with the resonance voltage curve of the high-frequency side of the f 0 of FIG. 3, the resonance voltage lowering frequency May be made higher.

上記構成により、コンデンサ３７に発生する共振電圧が適正な範囲になるように制御され、それにより所定時間当たりのギャップ４８のブレークダウン回数も適正な範囲に保たれるので、ギャップ４８のブレークダウン電圧の変動があっても高圧放電灯の始動不良や放電ギャップの短寿命といった不具合を防止できる。   According to the above configuration, the resonance voltage generated in the capacitor 37 is controlled so as to be in an appropriate range, and thereby the number of breakdowns of the gap 48 per predetermined time is also maintained in an appropriate range. Even if there are fluctuations, it is possible to prevent problems such as poor starting of the high pressure discharge lamp and short life of the discharge gap.

上記実施例では、放電ギャップの最初のブレークダウン電圧が通常時より著しく変動しても、高圧放電灯の始動不良や放電ギャップの短寿命といった不具合を防止できる高圧放電灯点灯装置を示したが、それを用いたアプリケーションとしての光源装置を図１２に示す。図１２において、６１は上記で説明した実施例の高圧放電灯点灯装置、６２は高圧放電灯５０が取り付けられるレフレクタ、６３は高圧放電灯点灯装置６１、高圧放電灯５０及びレフレクタ６２を内蔵する筐体である。なお、図は実施例を模擬的に図示したものであり、寸法、配置などは図面通りではない。そして、図示されない映像系の部材等を筐体６３内に適宜配置してプロジェクタが構成される。   In the above embodiment, even when the initial breakdown voltage of the discharge gap fluctuates significantly from the normal time, the high pressure discharge lamp lighting device that can prevent problems such as a start failure of the high pressure discharge lamp and a short life of the discharge gap is shown. FIG. 12 shows a light source device as an application using the same. In FIG. 12, 61 is a high pressure discharge lamp lighting device of the embodiment described above, 62 is a reflector to which the high pressure discharge lamp 50 is attached, 63 is a housing containing the high pressure discharge lamp lighting device 61, the high pressure discharge lamp 50 and the reflector 62. Is the body. In addition, the figure is a schematic illustration of the embodiment, and the dimensions, arrangement, and the like are not as illustrated. Then, a projector is configured by appropriately arranging a video system member or the like (not shown) in the housing 63.

上記より、高圧放電灯の始動不良や放電ギャップの短寿命といった不具合を防止した高圧放電灯点灯装置を内蔵したので、始動性を確保した信頼性の高い光源装置を得ることができる。   As described above, since the high-pressure discharge lamp lighting device that prevents problems such as poor starting of the high-pressure discharge lamp and short life of the discharge gap is incorporated, a highly reliable light source device that ensures startability can be obtained.

本発明に係る高圧放電灯点灯装置の実施の形態を示す回路構成図1 is a circuit configuration diagram showing an embodiment of a high pressure discharge lamp lighting device according to the present invention. 従来の高圧放電灯点灯装置を示す回路構成図Circuit configuration diagram showing a conventional high pressure discharge lamp lighting device 従来例におけるブリッジ回路スイッチング周波数と共振電圧の関係を示す図The figure which shows the relationship between the bridge circuit switching frequency and the resonance voltage in the conventional example 従来例におけるバラツキを含めたブリッジ回路スイッチング周波数と共振電圧の関係を示す図The figure which shows the relation between the bridge circuit switching frequency and the resonance voltage including the variation in the conventional example 従来例におけるブリッジ回路のスイッチング周波数と共振電圧と放電ギャップのブレークダウン電圧のバラツキの関係を示す図The figure which shows the relationship of the switching frequency of a bridge circuit in a prior art example, the resonance voltage, and the variation of the breakdown voltage of a discharge gap. 従来例におけるブリッジ回路のスイッチング周波数の動作を示す図The figure which shows the operation of the switching frequency of the bridge circuit in the conventional example 通常時における実際のブリッジ回路のスイッチング周波数の動作と放電ギャップ電圧の関係を示す図The figure which shows the relation between the operation of the switching frequency of the actual bridge circuit and the discharge gap voltage under normal conditions 従来例におけるギャップの初回のブレークダウン電圧が低い場合のブリッジ回路のスイッチング周波数の動作と放電ギャップ電圧の関係を示す図The figure which shows the relationship between the operation of the switching frequency of a bridge circuit, and the discharge gap voltage when the initial breakdown voltage of the gap in a prior art example is low. 従来例におけるギャップの初回のブレークダウン電圧が高い場合のブリッジ回路のスイッチング周波数の動作と放電ギャップ電圧の関係を示す図The figure which shows the relationship between the operation of the switching frequency of a bridge circuit, and the discharge gap voltage when the first breakdown voltage of the gap in a prior art example is high 実施例におけるギャップの初回のブレークダウン電圧が低い場合のブリッジ回路のスイッチング周波数の動作と放電ギャップ電圧の関係を示す図The figure which shows the relationship between the operation | movement of the switching frequency of a bridge circuit, and the discharge gap voltage when the initial breakdown voltage of the gap in an Example is low. 実施例におけるギャップの初回のブレークダウン電圧が高い場合のブリッジ回路のスイッチング周波数の動作と放電ギャップ電圧の関係を示す図The figure which shows the relationship between the operation | movement of the switching frequency of a bridge circuit, and the discharge gap voltage when the initial breakdown voltage of the gap in an Example is high. 本発明の光源装置を示す図The figure which shows the light source device of this invention

符号の説明Explanation of symbols

１０：直流電源
２０：チョッパ回路
３０：フルブリッジ回路
３１、３２、３３、３４：トランジスタ
３５：ブリッジ制御回路
３６：チョークコイル
３７：コンデンサ
４０：イグナイタ回路
４１、４２：ダイオード
４３、４４：抵抗
４５、４６：コンデンサ
４７：パルストランス
４８：放電ギャップ
４９１：パルス電圧発生数検出回路
５０：高圧放電灯 10: DC power supply 20: Chopper circuit 30: Full bridge circuit 31, 32, 33, 34: Transistor 35: Bridge control circuit 36: Choke coil 37: Capacitor 40: Igniter circuit 41, 42: Diode 43, 44: Resistor 45 46: Capacitor 47: Pulse transformer 48: Discharge gap 491: Pulse voltage generation number detection circuit 50: High-pressure discharge lamp

Claims (3)

直流電源からの出力を受け高圧放電灯へ電力を供給する降圧チョッパ回路と、該降圧チョッパ回路の出力を高周波および低周波の交流出力に変換して前記高圧放電灯に供給するフルブリッジ回路と、前記フルブリッジ回路の高周波電圧出力を受けて前記高圧放電灯を始動させるためのパルス電圧を発生するイグナイタ回路からなる高圧放電灯点灯装置において、
前記イグナイタ回路のパルス電圧の所定時間当たりの発生数を検出するパルス電圧発生数検出回路、及び
前記フルブリッジ回路のスイッチング動作により前記高周波電圧出力を発生する共振回路を備え、
前記パルス電圧発生数検出回路が検出した所定時間当たりのパルス電圧発生数が所定のパルス発生数よりも少なかった場合に、前記フルブリッジ回路の動作周波数を変化させて前記高周波電圧出力を高くするよう構成された高圧放電灯点灯装置。
 A step-down chopper circuit that receives an output from a DC power source and supplies power to the high-pressure discharge lamp; a full-bridge circuit that converts the output of the step-down chopper circuit into a high-frequency and low-frequency AC output and supplies the high-pressure discharge lamp; In the high pressure discharge lamp lighting device comprising an igniter circuit that receives a high frequency voltage output of the full bridge circuit and generates a pulse voltage for starting the high pressure discharge lamp,
A pulse voltage generation number detection circuit that detects the number of generations of the pulse voltage of the igniter circuit per predetermined time; and a resonance circuit that generates the high-frequency voltage output by a switching operation of the full bridge circuit,
When the pulse voltage generation number per predetermined time detected by the pulse voltage generation number detection circuit is smaller than the predetermined pulse generation number, the operating frequency of the full bridge circuit is changed to increase the high frequency voltage output. Constructed high pressure discharge lamp lighting device.
直流電源からの出力を受け高圧放電灯へ電力を供給する降圧チョッパ回路と、該降圧チョッパ回路の出力を高周波および低周波の交流出力に変換して前記高圧放電灯に供給するフルブリッジ回路と、前記フルブリッジ回路の高周波電圧出力を受けて前記高圧放電灯を始動させるためのパルス電圧を発生するイグナイタ回路からなる高圧放電灯点灯装置において、
前記イグナイタ回路のパルス電圧の所定時間当たりの発生数を検出するパルス電圧発生数検出回路、及び
前記フルブリッジ回路のスイッチング動作により前記高周波電圧出力を発生する共振回路を備え、
前記パルス電圧発生数検出回路が検出した所定時間当たりのパルス電圧発生数が所定のパルス発生数よりも多かった場合に、前記フルブリッジ回路の動作周波数を変化させて前記高周波電圧出力を低くするよう構成された高圧放電灯点灯装置。
 A step-down chopper circuit that receives an output from a DC power source and supplies power to the high-pressure discharge lamp; a full-bridge circuit that converts the output of the step-down chopper circuit into a high-frequency and low-frequency AC output and supplies the high-pressure discharge lamp; In the high pressure discharge lamp lighting device comprising an igniter circuit that receives a high frequency voltage output of the full bridge circuit and generates a pulse voltage for starting the high pressure discharge lamp,
A pulse voltage generation number detection circuit that detects the number of generations of the pulse voltage of the igniter circuit per predetermined time; and a resonance circuit that generates the high-frequency voltage output by a switching operation of the full bridge circuit,
When the number of pulse voltage generations per predetermined time detected by the pulse voltage generation number detection circuit is greater than the predetermined number of pulse generations, the operating frequency of the full bridge circuit is changed to lower the high frequency voltage output. Constructed high pressure discharge lamp lighting device.
請求項１又は２に記載の高圧放電灯点灯装置、高圧放電灯、該高圧放電灯が取り付けられるレフレクタ、及び少なくとも該高圧放電灯点灯装置を内包する筐体を備えた光源装置。 A light source device comprising: the high-pressure discharge lamp lighting device according to claim 1 or 2 ; a high-pressure discharge lamp; a reflector to which the high-pressure discharge lamp is attached; and a housing containing at least the high-pressure discharge lamp lighting device.
JP2007118321A 2007-04-27 2007-04-27 High pressure discharge lamp lighting device Expired - Fee Related JP5103641B2 (en)

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