WO2009125661A1 - 高圧放電灯点灯装置及び光源装置 - Google Patents
高圧放電灯点灯装置及び光源装置 Download PDFInfo
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- WO2009125661A1 WO2009125661A1 PCT/JP2009/055261 JP2009055261W WO2009125661A1 WO 2009125661 A1 WO2009125661 A1 WO 2009125661A1 JP 2009055261 W JP2009055261 W JP 2009055261W WO 2009125661 A1 WO2009125661 A1 WO 2009125661A1
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- pressure discharge
- discharge lamp
- lamp
- high pressure
- color wheel
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- 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
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- 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
- H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
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- 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 high pressure discharge lamp lighting device that supplies an alternating lamp current to light a high pressure discharge lamp, a light source device using the same, and a high pressure discharge lamp lighting method.
- a light source device using a short arc high-pressure discharge lamp combined with a reflecting mirror is used as a backlight of a projector, a projection TV, or the like.
- these high-pressure discharge lamps are required to improve various characteristics such as further improvement in brightness, downsizing, and longer life.
- extending the service life is highly demanded, and further improvements are required.
- maintaining the arc length during the service life is the most important issue. More specifically, the lighting voltage of the high-pressure discharge lamp (hereinafter referred to as “lamp voltage”) is determined. It needs to be kept constant.
- the lamp voltage decreases at the initial stage when the cumulative lighting time of the high-pressure discharge lamp is about several tens of hours, and then rises for a while during the long lifetime.
- the lamp voltage can be increased or decreased due to variations in individual lamps and variations in lighting conditions such as outside air temperature.
- one method is to control the lamp voltage by changing the lighting frequency in accordance with the lamp voltage at the time of lamp lighting. Specifically, the lighting frequency is increased when the lamp voltage becomes lower than a certain reference value, and the lighting frequency is lowered when the lamp voltage becomes higher than a certain reference value.
- the lamp voltage when the lamp operating frequency is high, the behavior of the lamp voltage tends to increase, and conversely, when the operating frequency is low, the behavior of the lamp voltage tends to decrease (hereinafter referred to as “the lamp voltage”). "High frequency” and "Low frequency” respectively).
- Patent Document 2 there is proposed a control for lighting a lamp by switching a plurality of times to two or more different lighting frequencies. That is, from the beginning, a lamp current waveform obtained by synthesizing a plurality of frequency components including a high frequency component and a low frequency component with a predetermined balance is adopted, so that the effect of the high frequency and the effect of the low frequency are combined.
- FIG. 7 an AC rectangular wave current combining a plurality of lighting frequencies is supplied to the high pressure discharge lamp to light the high pressure discharge lamp.
- FIG. 8A is a graph showing the relationship between the cumulative lighting time and the luminance maintenance rate in the lighting test
- FIG. 8B is a graph showing the relationship between the cumulative lighting time and the lamp voltage in the lighting test. is there.
- a plurality of lighting frequencies are arbitrarily selected so that the luminance maintenance ratio and lamp voltage behavior in the lamp life are good, and the high pressure discharge lamp is lit while switching the combination. It has become.
- JP 2006-185663 A Japanese Patent No. 3851343
- the effects described in each document can be expected.
- the use frequency component is arbitrarily selected in this document, it is not considered that the lighting frequency component to be selected has a specific restriction when used in a light source device such as a projector. .
- the polarity is reversed in synchronization with each color segment of the color wheel, or the current value is increased or decreased for each segment. Control is becoming more and more used. Therefore, the number of polarity reversals (that is, the lighting frequency) is largely determined by the number of rotations of the color wheel and the number of segments.
- a first aspect of the present invention is a high-pressure discharge lamp lighting device used in a DLP system using a color wheel, wherein a high-pressure discharge lamp having a pair of electrodes arranged opposite each other is replaced with a first set of current waveforms and
- a control means for controlling the content per unit time of the first and second sets in the combined current waveform, color Detection means for detecting a synchronization signal about the rotation of the wheel, output means for applying a composite current waveform according to the synchronization signal and the content rate to the high pressure discharge lamp, and detection means for detecting the lamp voltage of the high pressure discharge lamp
- the first and second sets are waveforms that are inverted corresponding to at least one of the rotational speed of the color wheel and the division position of the color wheel segment; Each period length of the first and second sets is a length corresponding to one rotation of the color wheel, the number of
- inversion is performed during a period corresponding to at least one of the segments in the second set.
- the second aspect of the present invention is a light source device comprising a DLP system including the high pressure discharge lamp lighting device, the high pressure discharge lamp, and the color wheel of the first aspect.
- a third aspect of the present invention is a combined current waveform composed of a plurality of frequency components f1 to fn (n ⁇ 3, fn ⁇ 1 ⁇ fn) used in a projector and having a pair of electrodes arranged opposite to each other.
- the control means is the lamp voltage selects the first component contained ratio C 1 when exceeds a predetermined value V, the lamp voltage exceeds a predetermined value V' It is configured to select a second component contained ratio C 2 when it becomes less than the average frequency of the second component contained ratio C 2 is higher than the average frequency of the first component contained ratio C 1, a plurality of Frequency components f1 to fn
- a high pressure discharge lamp ballast is a frequency component which does not interfere with the video signal used in the projector.
- the fourth aspect of the present invention is a light source device comprising a high pressure discharge lamp lighting device according to the third aspect and a projector including the high pressure discharge lamp.
- FIG. 1 is a circuit diagram of the present invention. 1 will be described below.
- the high pressure discharge lamp lighting device of the present invention includes a full-wave rectifier circuit 10, a step-down chopper circuit 20 that controls a DC voltage of the full-wave rectifier circuit 10 to a predetermined lamp power or lamp current by a PWM (pulse width modulation) control circuit, and a step-down chopper circuit 20
- a full bridge circuit 40 for converting the DC output voltage of the chopper circuit 20 into an AC rectangular wave current and applying it to the lamp 60, an igniter circuit 50 for applying a high voltage pulse voltage to the lamp at the time of starting the lamp, and the step-down chopper circuit 20
- a control circuit 30 for controlling the full bridge circuit 40.
- a full-wave rectification / capacitor input type circuit is shown as the rectifier circuit 10, but a booster circuit (power factor correction circuit) or the like is included as necessary.
- the step-down chopper circuit 20 includes a transistor 21, a diode 22, a choke coil 23, and a smoothing capacitor 24 that are PWM-controlled by a PWM control circuit 34.
- a DC voltage supplied from the full-wave rectifier circuit 10 is converted into predetermined lamp power or lamp. Controlled to convert to current.
- the full bridge circuit 40 is controlled by the bridge control circuit 45 so that the pair of transistors 41 and 44 and the pair of transistors 42 and 43 are alternately turned on / off at a predetermined frequency. As a result, an alternating current (basically a rectangular wave) is applied to the lamp 60.
- the lamp 60 is assumed to have a rated power of about 50 to 400W.
- the value of the predetermined lamp power or lamp current and the predetermined frequency are determined by the central control unit 35 in the control circuit 30. Further, the constant lamp current control uses the detected lamp current by the resistor 33, and the constant lamp power control uses the detected lamp voltage by the resistors 31 and 32 multiplied by the detected lamp current as required in the central control unit 35. be able to.
- the present invention turns on a high-pressure discharge lamp at a combined lighting frequency composed of selected frequency components, detects lamp parameters at the time of lighting, and includes the content rate (or content) of each lighting frequency per unit time according to the detection result.
- the composition ratio (the same applies hereinafter) is adjusted.
- supplementing the unit time there is no particular limitation on time, but it is desirable to define it within several seconds in consideration of stabilizing the lighting condition of the lamp on average.
- the lamp voltage is detected, and when the detection result becomes lower than a certain reference value VA , the content rate of f2 per unit time is adjusted to a high state, and conversely, another certain standard When it becomes higher than the value V B, the content of f2 per unit time is adjusted to be lower (reference value V A ⁇ reference value V B ).
- Example 1 the specification is suitable for a combination with a light source device employing a so-called DLP system using a reflective mirror device.
- the rotation speed of the color wheel used in the DLP system is 100 Hz.
- the lamp rated power is 170 W.
- the synchronization signal from the light source device and the current waveform supplied to the lamp from the lighting device are synchronized with the segments of the color wheel as shown in FIG. 3A, and each segment has a different value.
- the current waveform at this time is Ia.
- Ia performs the polarity inversion three times in one rotation of the color wheel (in this specification, the number of inversions does not include the start part of one set of lamp current waveforms, but the end part. Included). Therefore, the number of inversions per second is 300, which corresponds to 150 Hz when converted to a frequency, and the average frequency per set of lamp current waveforms between the synchronization signals is 150 Hz.
- Ib performs polarity inversion at the switching point of each segment, and further inserts polarity inversion once for each of the green (G) and blue (B) segments.
- the number of polarity reversals in one rotation is 7 times. Accordingly, when converted to a frequency per second, this corresponds to 350 Hz, and the average frequency per set between the synchronization signals is 350 Hz.
- the Ib content may be increased when a high frequency state is desired, and the Ia content may be increased when a low frequency state is desired.
- the unit time for determining the content rate is 1 second.
- the high pressure discharge lamp lighting device detects the lamp voltage while the lamp is lit, and if the lamp voltage exceeds the reference value V1, the Ib content is reduced to RL , and the lamp voltage falls below the reference value V1. Increases the content of Ib to RH .
- the reference value V1 is a value having hysteresis, the reference value V1 when Ru switched from R L to R H is 65V, the reference value V1' when Ru switched from R H to R L is 75V.
- the content ratio R L of Ib when the lamp voltage exceeds V1' the (75V) 0% the lamp voltage is 100% of content R H of Ib in the case of less than V1 (65V).
- the content rate may be switched stepwise. Thereby, a transient state of the lamp due to a sudden change in the lighting frequency can be avoided.
- V1 65V
- the content of Ib shifts as follows: R L ⁇ R 1 ⁇ R 2 ⁇ R 3 ⁇ R 4 ⁇ RH, and the lamp voltage is V1 ′ ( If it exceeds 75 V), the transition may be made as R H ⁇ R 4 ⁇ R 3 ⁇ R 2 ⁇ R 1 ⁇ RL .
- the transition period is set to 20 minutes. However, if the transition period is about 1 minute or longer, an effect of avoiding a transient state of the lamp can be obtained. If only the effect is to be pursued, the transition period should be long, but it is preferably within one hour from the viewpoint of practical use as a light source device. Therefore, the transition period may be set to about 1 minute to 1 hour, more preferably about 10 minutes to 30 minutes in consideration of the effect of stepwise change and actual use.
- the color wheel is a three-primary color type consisting of red (R), green (G) and blue (B), and a four-color type with three primary colors plus cyan (C).
- RGB red
- G green
- B blue
- C three primary colors plus cyan
- Y yellow
- M magenta
- C cyan
- the rotation speed of the color wheel is about 100 to 180 Hz (100 Hz, 120 Hz, 150 Hz, 180 Hz, etc.), the number of segments is about 3 to 6, and the required lighting frequency on the high frequency side is 200 Hz to 1 kHz.
- the current waveform set on the high frequency side it is necessary to have a waveform including inversion during a period corresponding to at least one segment.
- the number of inversions in one set of the lamp current waveform may be an odd number. This is because the nth set and the (n + 1) th set are symmetric with respect to the time axis.
- the reversal point may be based on the segment to some extent.
- the number of inversions in one set of lamp current waveforms must be an even number.
- the neck side electrode A of the pair of electrodes becomes hotter than the opening side electrode B.
- the lamp current waveform as a whole is asymmetric so that the current time product of the negative current is larger than the current time product of the positive current. If one set is configured, a lamp current having the same polarity waveform is always applied by an even number of inversions, and the temperature balance or the degree of wear of the electrodes A and B can be balanced. Note that a current square time product may be used instead of the current time product.
- FIG. 3C is a diagram showing an even-numbered inverted waveform (a waveform that is asymmetric as a whole).
- inversion is performed between I (R) and I (Y) and between I (W) and I (B).
- Ic corresponds to 100 Hz in terms of frequency because the number of inversions of the polarity in one rotation of the color wheel is 2. That is, the average frequency per set between the synchronization signals is 100 Hz, and can be used as a low-frequency current waveform set (substitute for Ia).
- FIG. 3D is also a diagram showing an even inversion waveform (a waveform that is asymmetric as a whole).
- inversions are performed at intermediate points of I (R), I (G), and I (B), and inversions are performed before and after I (Y) and I (W).
- I (Y) is larger than the current time product of I (W)
- the waveform is biased toward the negative current as a whole.
- Id corresponds to 400 Hz in terms of frequency because the number of polarity reversals during one rotation of the color wheel is 8. That is, the average frequency per set between the synchronization signals is 400 Hz, and can be used as a high-frequency current waveform set (substitute for Ib).
- the opening side electrode B becomes hotter than the neck side electrode A when a positive and negative symmetrical lamp current is applied.
- the current from the electrode B to the electrode A is a positive current (the reverse is a negative current)
- the lamp current waveform is asymmetric as shown in FIG. 3C or 3D
- the current time product of the negative current is the current time product of the positive current.
- One set may be configured to be larger than that.
- Example 2 The second embodiment shows an example in which the frequency component to be contained is a frequency component that does not interfere with the video synchronization signal used in the projector.
- the frequency component to be contained is a frequency component that does not interfere with the video synchronization signal used in the projector.
- the projector used in the second example it was confirmed that there are 50 Hz, 82 Hz, 110 Hz, 165 Hz, 190 Hz, and 380 Hz as frequencies that are not synchronized with the video synchronization signal used.
- the rated power of the lamp used is 170W.
- 82 Hz (f1) and 380 Hz (f2) were selected as frequency components to be contained.
- the content rate per unit time of f2 may be lowered when a low frequency state is desired, and may be increased when a high frequency state is desired.
- the unit time for determining the content rate is 1 second.
- the high pressure discharge lamp lighting device detects the lamp voltage while the lamp is lit, and when the lamp voltage exceeds the reference value V2, the content of f2 is lowered to RL , and the lamp voltage falls below the reference value V2. Increases the content of f2 to RH .
- the reference value V2 is a value having hysteresis, the reference value V2 when Ru switched from R L to R H is 65V, the reference value V2' when Ru switched from R H to R L is 75V.
- the content rate RL of f2 when the lamp voltage exceeds V2 ′ (75V) is 30%
- the content rate RH of f2 when the lamp voltage is less than V2 (65V) is 70%.
- the content rate may be switched stepwise. Thereby, a transient state of the lamp due to a sudden change in the lighting frequency can be avoided. For example, when the lamp voltage becomes less than V2 (65V), the content rate of f2 shifts from the following R L ⁇ R 1 ⁇ R 2 ⁇ R 3 ⁇ RH, and the lamp voltage changes to V2 ′ (75V). If it exceeds, it may shift the R H ⁇ R 3 ⁇ R 2 ⁇ R 1 ⁇ R L.
- the transition period is 15 minutes.
- the transition period may be about 1 minute to 1 hour, more preferably about 10 minutes to 30 minutes.
- appropriate lamp voltage control can be realized even when the lighting frequency is limited in order to avoid interference with the video synchronization signal.
- Example 3 In the third embodiment, for the same purpose as in the second embodiment, 82 Hz (f1), 110 Hz (f2), and 380 Hz (f3) are selected as frequency components to be contained, and lighting is performed at a predetermined content ratio per unit time. Configure the frequency. If the low frequency state is desired, the average frequency in the content ratio is reduced, and if the high frequency state is desired, the average frequency in the content ratio is increased. The unit time for determining the content ratio is 1 second.
- the high pressure discharge lamp lighting device detects the lamp voltage during lamp lighting, and when the lamp voltage exceeds the reference value V3, the content ratio is switched from CM to CL below.
- the reference value V3 is set to 80V.
- the reference value 2 has a hysteresis, and the reference value V3 ′ at this time is 77V.
- the reference value V4 is also provided with hysteresis similarly to the reference value V3, and the reference value V4 ′ at this time is 63V.
- the content ratio may be switched in stages, thereby avoiding a transient state of the lamp due to a sudden change in the lighting frequency.
- the stepwise change period may be provided. Each stepwise change period may be about 5 minutes.
- Example 4 (light source device).
- a high pressure discharge lamp lighting device with improved lamp voltage control is shown.
- a light source device as an application using the high pressure discharge lamp lighting device is shown in FIG.
- 100 is the high pressure discharge lamp lighting device of FIG. 1 described above
- 70 is a reflecting mirror to which the lamp is attached
- 110 is a high pressure discharge lamp lighting device
- a housing containing the lamp is shown in FIG.
- the figure is a schematic illustration of the embodiment, and the dimensions, arrangement, and the like are not as illustrated.
- a projector is configured by appropriately arranging a video system member or the like (not shown) in the housing.
- a color wheel (not shown) is provided.
- the “rectangular wave” as the output current in this embodiment includes a waveform that is not strictly a perfect rectangular wave.
- It includes a waveform having slight irregularities, and a waveform having a different time product of current for each polarity at the time of lighting as shown in FIG. 5C.
- it includes waveforms as shown in FIGS. 3A and 3B in which the current value is changed in synchronization with the color wheel segment used in the DLP system to change the polarity. Therefore, the lamp current during normal lighting is intended to include such a waveform.
- the frequency content is expressed as a percentage (%) as a time distribution.
- the time obtained by multiplying the number of cycles of a certain frequency several times and the content time are strictly Since the values do not match, the content value may be approximate, and the frequency will be interrupted in the middle of one cycle, and lighting at another frequency will be started. It is.
- the lamp parameter is set as the lamp voltage, and the low frequency and the high frequency are switched according to the lamp voltage.
- the lamp parameter is set as the lighting duration from the start of lighting, and the low frequency is set for each predetermined lighting duration.
- the high frequency may be switched. In the case of a lamp whose lamp voltage behavior is known in advance, this operation can be performed without detecting the lamp voltage.
- the AC power supply circuit is composed of a rectifier circuit, a step-down chopper circuit, and a full bridge circuit, but other configurations may be used as long as an AC rectangular wave can be supplied to the lamp.
- the input power source is a DC power source
- the front stage of the full bridge circuit may be only a DC / DC converter.
- other types of circuits such as push-pull inverters may be used instead of the full bridge circuit as long as direct current can be converted into alternating current.
- control circuit 30 can perform inversion control of the transistors 41 to 44 of the full bridge circuit 40 and PWM control of the transistor 21 of the step-down chopper circuit 20, the configuration in the control circuit is limited to that shown in the figure. Not.
- the lamp voltage can be adjusted by combining a plurality of lighting frequencies and changing the content rate or the composition ratio of each frequency per unit time according to the lamp parameters. It can be controlled appropriately.
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Abstract
Description
近年、これらの高圧放電灯は、更なる明るさの向上や小型化、長寿命化等様々な特性の改善が要求されている。特に長寿命化は要求が高く、更なる改善が必要とされている。そして、長寿命化のためにはアーク長を寿命期間中に維持することが最も重要な課題となっており、より具体的には高圧放電灯の点灯電圧(以下、「ランプ電圧」という)を一定に維持することが必要とされる。
しかし実際には、高圧放電灯の累積点灯時間が数十時間程度の初期に、ランプ電圧は低下し、その後長期にわたる寿命期間中においてはランプ電圧が暫時上昇することが知られている。
また、寿命期間中においてはランプ個々のばらつき、外気温などの点灯条件のばらつきによってもランプ電圧が上昇や下降といった挙動を見せる。
本実施例では、反射型ミラーデバイスを用いたいわゆるDLPシステムを採用した光源装置と組合せた場合に適した仕様とした。ここで、DLPシステムに使用されるカラーホイールの回転数は100Hzであり、図2に示すように赤(R)、緑(G)、青(B)、白(W)、黄(Y)の5つのセグメントに分割され、それぞれのセグメントの角度は、赤(R)=100deg、緑(G)=100deg、青(B)=100deg、白(W)=30deg、黄(Y)=30degである。なお、ランプ定格電力は170Wである。
例えば、ランプ電圧がV1´(75V)を超えた場合のIbの含有率RLを0%とし、ランプ電圧がV1(65V)未満の場合のIbの含有率RHを100%とする。
例えば、ランプ電圧がV1(65V)未満となった場合に、Ibの含有率を以下のRL→R1→R2→R3→R4→RHと移行し、ランプ電圧がV1´(75V)を超えた場合に、RH→R4→R3→R2→R1→RLと移行するようにしてもよい。
RL:Ib(350Hz)=0%
R1:Ib(350Hz)=20%[5分継続]
R2:Ib(350Hz)=40%[5分継続]
R3:Ib(350Hz)=60%[5分継続]
R4:Ib(350Hz)=80%[5分継続]
RH:Ib(350Hz)=100%
但し、カラーホイールの回転速度は100~180Hz程度(100Hz、120Hz、150Hz、180Hz等)であること、セグメント数が3~6程度であること、必要な高周波側の点灯周波数が200Hz~1kHzであること等を考慮すると、高周波側の電流波形セットにおいては、少なくとも1つのセグメントに対応する期間中に反転を含む波形とする必要がある。
例えば、図4Aに示すような反射鏡付きランプにおいて、正負対称のランプ電流を印加した場合、一対の電極のうちのネック側電極Aが開口側電極Bよりも高温になる。この場合、電極Aの消耗が早くなるので、電極Aが陽極として働く作用を軽減し(電極Bが陰極として働く作用を増大させ)両電極の消耗の均衡を図ることが望ましい。
従って、電極Aから電極Bへ向かう電流を正電流(その逆を負電流)とした場合、ランプ電流波形を全体として非対称として負電流の電流時間積が正電流の電流時間積よりも大きくなるように1セットを構成すれば、偶数回の反転によって常に同一極性波形のランプ電流が印加されることになり、電極A及びBの温度的均衡あるいは消耗度の均衡を図ることができる。なお、電流時間積の替りに電流二乗時間積を用いて考えてもよい。
従って、電極Bから電極Aへ向かう電流を正電流(その逆を負電流)とした場合、ランプ電流波形を図3C又は3Dのように非対称として負電流の電流時間積が正電流の電流時間積よりも大きくなるように1セットを構成すればよい。これにより、偶数回の反転によって常に同一極性波形の電流が印加されることになり、電極A及びBの温度的均衡あるいは消耗度の均衡を図ることができる。
第2の実施例では、含有すべき周波数成分をプロジェクタに使用される映像同期信号と干渉しない周波数成分とする例を示す。第2の実施例に用いたプロジェクタの場合、使用される映像同期信号と同期しない周波数として、50Hz、82Hz、110Hz、165Hz、190Hz及び380Hzがあることが確認された。なお、使用ランプの定格電力は170Wである。
例えば、ランプ電圧がV2´(75V)を超えた場合のf2の含有率RLを30%とし、ランプ電圧がV2(65V)未満の場合のf2の含有率RHを70%とする。
例えば、ランプ電圧がV2(65V)未満となった場合に、f2の含有率を以下のRL→R1→R2→R3→RHと移行し、ランプ電圧がV2´(75V)を超えた場合に、RH→R3→R2→R1→RLと移行するようにしてもよい。
RL:(82Hz=70%/380Hz=30%)
R1:(82Hz=60%/380Hz=40%)[5分継続]
R2:(82Hz=50%/380Hz=50%)[5分継続]
R3:(82Hz=40%/380Hz=60%)[5分継続]
RH:(82Hz=30%/380Hz=70%)
上記により、映像同期信号との干渉を回避するために点灯周波数が限定された場合においても、適切なランプ電圧制御を実現できる。
第3の実施例では、実施例2と同様の趣旨から、含有すべき周波数成分として82Hz(f1)、110Hz(f2)及び380Hz(f3)を選択し、単位時間あたりの所定含有構成比で点灯周波数を構成する。低周波状態としたい場合にはその含有構成比における平均周波数を低くし、高周波状態としたい場合にはその含有構成比における平均周波数を高くすればよい。なお、含有構成比を決める単位時間は1秒である。
CM:(82Hz=40%/110Hz=20%/380Hz=40%)
CL:(82Hz=60%/110Hz=20%/380Hz=20%)
CH:(82Hz=20%/110Hz=20%/380Hz=60%)
その後、ランプ電圧が再び基準値V4より高くなると含有率組合せを再びCHからCMに戻す制御が行われる。ただし、基準値V4についても上記基準値V3と同様にヒステリシスをもたせており、この時の基準値V4´は63Vである。
例えば、CMとCLの間に、
CL1:(82Hz=55%/110Hz=20%/380Hz=25%)
CL2:(82Hz=50%/110Hz=20%/380Hz=30%)
CL3:(82Hz=45%/110Hz=20%/380Hz=35%)
の段階的変化期間を設けてもよいし、CMとCHの間に、
CH1:(82Hz=35%/110Hz=20%/380Hz=45%)
CH2:(82Hz=30%/110Hz=20%/380Hz=50%)
CH3:(82Hz=25%/110Hz=20%/380Hz=55%)
の段階的変化期間を設けてもよい。なお、各段階的変化期間は5分程度であればよい。
上記実施例では、ランプ電圧制御を向上した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5に示す。
図5において、100は上記で説明した図1の高圧放電灯点灯装置、70はランプが取り付けられる反射鏡、110は高圧放電灯点灯装置、ランプ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に適宜配置してプロジェクタが構成される。
また、DLPシステムの場合はカラーホイール(図示せず)を備えるものとする。
(1)本実施例における出力電流としての「矩形波」とは、厳密には完全な矩形波ではないような波形も含む。例えば、完全な矩形波では無く、図5Aのように矩形波半サイクルの開始時の電流値と終了時の電流値とが僅かに異なるような波形や、図5Bのように半サイクルの中盤に僅かな凹凸があるような波形、また図5Cのように点灯時の極性ごとに電流の時間積が異なる波形も含む。さらに、DLPシステムに使用されているカラーホイールのセグメントに同期して電流値を変化させ、極性を変化させる図3A、図3Bのような波形も含む。従って、通常点灯時におけるランプ電流はそのような波形も含む趣旨である。
10:全波整流回路
11:ダイオードブリッジ
12:コンデンサ
20:降圧チョッパ回路
21:トランジスタ
22:ダイオード
23:チョークコイル
24:コンデンサ
30:制御回路
31,32,33:抵抗
34:PWM制御回路
35:中央制御部
40:フルブリッジ回路
41,42,43,44:トランジスタ
45:ブリッジ制御回路
50:イグナイタ回路
51:イグナイタ制御回路
60:高圧放電灯
70:反射鏡
80:副反射鏡
100:高圧放電灯点灯装置
110:プロジェクタ筐体
A、B:電極
Claims (8)
- カラーホイールを用いるDLPシステムに使用される高圧放電灯点灯装置であって、対向配置された一対の電極を有する高圧放電灯を、第1のセットの電流波形及び第2のセットの電流波形の組み合わせからなる合成波形電流で交流点灯させる高圧放電灯点灯装置において、
前記合成波形電流における前記第1及び第2のセットの単位時間当たりの含有率を制御する制御手段、
前記カラーホイールの回転についての同期信号を検知する検知手段、
前記同期信号及び前記含有率に従った合成波形電流を前記高圧放電灯に印加する出力手段、及び
前記高圧放電灯のランプ電圧を検出する検出手段
を備え、
前記第1及び第2のセットが前記カラーホイールの回転速度及び該カラーホイールのセグメントの分割位置の少なくとも1つに対応して反転される波形であり、該第1及び第2のセットの各期間長が該カラーホイールの1回転に相当する長さであり、該第2のセットにおける反転回数が該第1のセットにおける反転回数よりも多く、
前記制御手段が、ランプ電圧が所定値Vを超えた場合に前記第2のセットの含有率をRL%とし、ランプ電圧が所定値V´未満となった場合に該第2のセットの含有率をRH%(0≦RL<RH≦100)とするよう構成された高圧放電灯点灯装置。 - 請求項1記載の高圧放電灯点灯装置において、
前記第2のセットにおいて、前記セグメントのうちの少なくとも1つに対応する期間中に反転が行なわれる高圧放電灯点灯装置。 - 請求項1記載の高圧放電灯点灯装置、前記高圧放電灯及び前記カラーホイールを備えたDLPシステムからなる光源装置。
- プロジェクタに使用され、対向配置された一対の電極を有する高圧放電灯を複数の周波数成分f1~fn(n≧3、fn-1<fn)からなる合成波形電流で交流点灯させる高圧放電灯点灯装置であって、
前記周波数成分f1~fnの単位時間当たりの含有構成比を制御する制御手段、
該含有構成比に従った合成波形電流を前記高圧放電灯に印加する出力手段、及び
前記高圧放電灯のランプ電圧を検出する検出手段
を備え、
前記制御手段が、ランプ電圧が所定値Vを超えた場合に第1の含有構成比C1を選択し、ランプ電圧が所定値V´未満となった場合に第2の含有構成比C2を選択するよう構成され、
前記第2の含有構成比C2における平均周波数が前記第1の含有構成比C1における平均周波数よりも高く、前記複数の周波数成分f1~fnが前記プロジェクタに使用される映像信号と干渉しない周波数成分である高圧放電灯点灯装置。 - 請求項4記載の高圧放電灯点灯装置及び前記高圧放電灯を内包したプロジェクタからなる光源装置。
- カラーホイールを用いるDLPシステムにおいて使用され、対向配置された一対の電極を有する高圧放電灯を、第1のセットの電流波形及び第2のセットの電流波形の組み合わせからなる合成波形電流で交流点灯させる方法であって、
前記カラーホイールの回転についての同期信号を検知するステップ、
前記高圧放電灯のランプ電圧を検出するステップ、
検出されたランプ電圧に基づいて、前記合成波形電流における前記第1及び第2のセットの単位時間当たりの含有率を制御するステップ、及び
前記同期信号及び前記含有率に従った合成波形電流を前記高圧放電灯に印加するステップ
からなり、
前記第1及び第2のセットが前記カラーホイールの回転速度及び該カラーホイールのセグメントの分割位置の少なくとも1つに対応して反転される波形であり、該第1及び第2のセットの各期間長が該カラーホイールの1回転に相当する長さであり、該第2のセットにおける反転回数が該第1のセットにおける反転回数よりも多く、
前記制御するステップが、0≦RL<RH≦100として、
ランプ電圧が所定値Vを超えた場合に前記第2のセットの含有率をRL%とするステップ、及び
ランプ電圧が所定値V´未満となった場合に該第2のセットの含有率をRH%とするステップ
を含む方法。 - 請求項6記載の方法において、
前記第2のセットにおいて、前記セグメントのうちの少なくとも1つに対応する期間中に反転が行なわれる方法。 - プロジェクタに使用され、対向配置された一対の電極を有する高圧放電灯を複数の周波数成分f1~fn(n≧3、fn-1<fn)からなる合成波形電流で交流点灯させる方法であって、
前記高圧放電灯のランプ電圧を検出するステップ、
検出されたランプ電圧に基づいて、前記周波数成分f1~fnの単位時間当たりの含有構成比を制御するステップ、及び
該含有構成比に従った合成波形電流を前記高圧放電灯に印加するステップ
からなり、
前記制御するステップが、
ランプ電圧が所定値Vを超えた場合に第1の含有構成比C1を選択するステップ、及び
ランプ電圧が所定値V´未満となった場合に第2の含有構成比C2を選択するステップ
を含み、
前記第2の含有構成比C2における平均周波数が前記第1の含有構成比C1における平均周波数よりも高く、前記複数の周波数成分f1~fnが前記プロジェクタに使用される映像信号と干渉しない周波数成分である方法。
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EP09729686A EP2265096A1 (en) | 2008-04-08 | 2009-03-18 | High-pressure discharge lamp lighting device, and light source device |
US12/936,480 US8461772B2 (en) | 2008-04-08 | 2009-03-18 | High pressure discharge lamp ballast and light source apparatus |
CN2009801124598A CN101990788B (zh) | 2008-04-08 | 2009-03-18 | 高压放电灯镇流器和光源设备 |
CA2719837A CA2719837A1 (en) | 2008-04-08 | 2009-03-18 | High pressure discharge lamp ballast and light source apparatus |
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JP2008100144A JP4605407B2 (ja) | 2008-04-08 | 2008-04-08 | 高圧放電灯点灯装置及び光源装置 |
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JP5170596B2 (ja) * | 2011-08-11 | 2013-03-27 | 岩崎電気株式会社 | 高圧放電灯点灯装置及び光源装置 |
JP5849588B2 (ja) * | 2011-10-06 | 2016-01-27 | セイコーエプソン株式会社 | プロジェクター及びプロジェクターシステム |
JP5720911B2 (ja) * | 2014-01-10 | 2015-05-20 | セイコーエプソン株式会社 | プロジェクター及びプロジェクターシステム |
JP5920611B2 (ja) * | 2015-03-26 | 2016-05-18 | セイコーエプソン株式会社 | プロジェクター及びプロジェクターシステム |
JP6673081B2 (ja) * | 2016-07-28 | 2020-03-25 | ウシオ電機株式会社 | 放電ランプ点灯装置、及びこれを備えた画像形成装置 |
CN109212875B (zh) * | 2017-07-06 | 2021-07-06 | 深圳光峰科技股份有限公司 | 一种投影仪控制***及控制方法 |
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EP2265096A1 (en) | 2010-12-22 |
US20110025223A1 (en) | 2011-02-03 |
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US8461772B2 (en) | 2013-06-11 |
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