CN1980513A - Discharge lamp lighting device and projection type image display apparatus having the same - Google Patents
Discharge lamp lighting device and projection type image display apparatus having the same Download PDFInfo
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- CN1980513A CN1980513A CNA2006101064415A CN200610106441A CN1980513A CN 1980513 A CN1980513 A CN 1980513A CN A2006101064415 A CNA2006101064415 A CN A2006101064415A CN 200610106441 A CN200610106441 A CN 200610106441A CN 1980513 A CN1980513 A CN 1980513A
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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
Abstract
A computing circuit computes a target value of a current to be supplied to a discharge lamp and generates a pulse control signal for superpose a pulse current. Furthermore, the computing circuit controls a current control circuit so that a pulse current is superposed on a lamp current at a predetermined cycle and power supplied to the discharge lamp is kept constant. For that purpose, the computing circuit lowers a DC current level of the lamp current when a pulse current is superposed on the lamp current, and exercises control so that an integrated amount of power at a predetermined cycle is equalized to a predetermined integrated amount of power.
Description
Technical field
The present invention relates to the image display device of liquid crystal projection apparatus etc. and be used for its lighting apparatus for discharge lamp, particularly, relate to the impulse waveform overlap technique of lamp current.
Background technology
So far, as the light source of the image display device of liquid crystal projection apparatus etc., use the high-pressure discharge lamp (discharge lamp) of the metal halide lamp of conversion efficiency height and points of proximity light source and high-pressure mercury-vapor lamp etc.In order to light high-pressure discharge lamp, light required voltage and current from the lighting apparatus for discharge lamp supply of special use.Exist discharge lamp and move the situation that produces scintillation owing to light the starting point of middle arc.Therefore for the work of stable discharging lamp igniting device, several technical schemes have been proposed.
Disclose in the Japanese patent laid-open 5-74583 patent gazette that (High Intensity Discharge: high-intensity discharge) the consumption electric power of lamp is for certain in order to keep HID, the device of lighting of lighting the high HID lamp of efficient is provided, calculate the consumption electric power of HID lamp from the both end voltage of the lamp current that flows through the HID lamp and HID lamp, supply to the technology of the current value of HID lamp according to the difference control of operation result and set point.And these calculating can realize by microprocessor.
The flat 10-501919 patent gazette of the special table of Japan Patent discloses with the purpose that occurs as that suppresses when the high-pressure discharge lamp lighting to glimmer, and the current impulse of specified period is overlapped the structure of supplying with on the AC lamp current.
The Japan Patent spy opens the 2004-281381 patent gazette and has proposed to suppress the flicker in the high-pressure discharge lamp lighting and the brightness of lamp is remained necessarily, the stabilisation and the lamp long lifetime that reach control are purpose, and making electric power is the scheme of certain lamp current control circuit.Explanation as this execution mode, record " ... even by resistance 31a the amplitude waveform that overlaps lamp flicker on the AC lamp current and reduce stage signal 57 being adjusted also to become obtains the step signal 18bout of balance up and down, the mean value of this waveform is constant.As a result, can make lamp electric power constant, one side reduces the lamp flicker, and one side is lighted lamp more smoothly." (paragraph [0051]), and in Fig. 3 of document etc., represented should stage ripple signal waveform.
Summary of the invention
In order to make the more stable work of discharge lamp, preferably by as putting down in writing in the above-mentioned Japanese patent laid-open 5-74583 communique, keep that to consume electric power certain, and as put down in writing in the above-mentioned patent documentation 2, impulse waveform is overlapped mode on the lamp current.At this moment supposition carry out Current Control by microprocessor (below, be called microcomputer) and impulse waveform overlapping.But, have the slow shortcoming of response characteristic by the overlapping control of the impulse waveform of microcomputer.This is that response characteristic by feedback control system causes.That is because switch from microcomputer output after the control signal of lamp current to lamp current in fact the variation of pulse type ground need the time, so the impulse waveform passivation.As a result, the flicker in the time of can not fully being prevented lamp and lighting and the effect of lamp long lifetime.
In addition, in the method for the flat 10-501919 patent gazette record of the special table of Japan Patent, even if can the superposed current pulse reduce flicker, the magnitude of current only increases the amount of the current impulse of addition, and the result has stayed total electricity than the big such problem of desired value.
Further, the Japan Patent spy opens the method for putting down in writing in the 2004-281381 communique to have when certain and carry out current impulse when overlapping in order to keep electric power, by only deducting pulse at leading portion, make electric current (being electric power) be certain structure generally to add the amount of pulse at back segment.At this moment, alternatively repetition pulse deduct the zone and add the zone, require circuit to have high-speed response.If response not enough then the impulse waveform passivation, can not obtain the effect of desired inhibition flicker.
The objective of the invention is to proceed at high speed the pulse overlap of lamp current, prevent the passivation of impulse waveform.Perhaps, it is certain to the objective of the invention is simultaneously to keep electric power, and one side proceeds to the pulse overlap of lamp current at high speed, prevents the passivation of impulse waveform.
In one aspect of the invention, lighting apparatus for discharge lamp possesses calculating and should supply to the circuit control circuit that the target current value of discharge lamp and generation are used for that pulse current overlapped the arithmetic processing circuit of the pulse control signal on the electric current of supply and supply to the electric current of discharge lamp according to target current value and pulse control signal control.The circuit control circuit has the current detection value of comparison supplied to discharge lamp and the error amplifier of target current value, be provided with during, make the incoming level of the current detection value that is input to error amplifier only reduce level switching part with overlapping pulse current a great deal of according to pulse control signal overlapping pulses electric current.
Here, as the level switching part,, correspondingly switch the ON/OFF (on/off) of a plurality of switches with pulse control signal at the input side of the current detection value of error amplifier be connected in parallel a plurality of resistors and switch.
In addition, as the level switching part, connect the amplifier of the level that amplifies the current detection value that is input to error amplifier, with the correspondingly gain of switched amplifier of pulse control signal.
In another aspect of the present invention, lighting apparatus for discharge lamp possesses the control circuit power of controlling the electric power that supplies to discharge lamp and in specified period pulse current is overlapped on the lamp current of discharge lamp, and information of voltage and current information according to the electric power that supplies to discharge lamp, the control control circuit power makes electric power certain calculation treatment circuit.Arithmetic processing circuit is to reduce the DC level of lamp current when pulse current being added in and overlapping on the lamp current, the mode that makes the interior cumulative power amount of specified period become the cumulative power amount of regulation is controlled.
Perhaps arithmetic processing circuit to be reducing the DC level of lamp current when pulse current being added in and overlapping on the lamp current, and the mode of the cumulative power amount when the cumulative power amount when making the pulse current in the overlapping specified period equals overlapping pulses electric current is not controlled.
Here when regarding the voltage of supplied to discharge lamp as one regularly in specified period, arithmetic processing circuit is so that the accumulated current amount in the specified period becomes the mode of the accumulated current amount of regulation controls.
Image display device of the present invention possesses the lighting apparatus for discharge lamp of lighting discharge lamp, forms the image-displaying member of the optical image corresponding with picture signal to modulating from the light of lighting apparatus for discharge lamp irradiation, drive the drive circuit of image-displaying member and will be incident upon optical system on the screen through the light of image-displaying member according to picture signal.
Description of drawings
Fig. 1 is the schematic diagram of an example of the expression projection type video display device that uses lighting apparatus for discharge lamp.
Fig. 2 is the circuit diagram of an embodiment of expression lighting apparatus for discharge lamp.
Fig. 3 is the sequential chart of variation of the output voltage of expression discharge lamp.
Fig. 4 is the internal structure figure of an example of the current control circuit 20 in the presentation graphs 2.
Fig. 5 is the internal structure figure of variation of the current control circuit 20 of presentation graphs 4.
Fig. 6 A, B are the schematic diagrames of the lamp current waveform of indicating impulse electric current when overlapping.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
Fig. 1 is the pie graph of an embodiment of the expression projection type video display device 10 that uses lighting apparatus for discharge lamp.The light that sends from the discharge lamp 2 that constitutes light source cell device 3 reflections that are reflected are shone from the back side of image-displaying member 4.To project on the screen 6 through the light of image-displaying member 4 by optical system 5.Image-displaying member 4 for example is a liquid crystal panel, is driven by drive circuit 7 according to picture signal, accordingly the light of irradiation is modulated with this picture signal and is formed optical image.The optical image amplification is incident upon on the screen 6, shows as image.Lighting apparatus for discharge lamp 1 carries out the startup of discharge lamp 2 and lights control.
Fig. 2 is the circuit diagram of an embodiment of expression lighting apparatus for discharge lamp 1.The 11st, power input terminal, the 12nd, MOS-FET, the 13rd, diode, the 14th, choke, the 15th, electric capacity, the 16th, chopper circuit, the 17,18, the 26th, resistance, the 19th, firing circuit.Firing circuit 19 produces the high voltage pulse that is used to begin to light discharge lamp 2 according to the output of chopper circuit 16.The 25th, the PWM of control chopper circuit 16 (Pulse Width Modulation: pulse width modulation) control circuit, the 20th, the current control circuit of control pwm control circuit 25.
As input terminal to current control circuit 20, the 21st, the voltage that in resistance 26, produces by the lamp current that flows through discharge lamp 2 (below, be called IS voltage) input terminal, the 22nd, the input terminal of reference voltage Io, the 23rd, the input terminal of the overlapping control signal Δ of impulse waveform Io.The 24th, from the lead-out terminal of the current controling signal of current control circuit 20 output.
The 27th, input begins to light the terminal of the signal (below, be called the lamp connection signal) of discharge lamp 2, and the 28th, arithmetic processing circuit, the 29th, the reference voltage generating circuit that generates by arithmetic processing circuit 28.
Arithmetic processing circuit 28 for example is made of microcomputer, by built-in analog-digital converter AD, from the output voltage (hereinafter referred to as VS voltage) of the voltage detecting chopper circuit 16 that obtained by resistor 17,18 dividing potential drops.And, calculate that the output power make discharge lamp 2 becomes setting and the target current value of wanting supplied to discharge lamp 2, generation reference signal (pwm signal).Reference voltage generating circuit 29 for example is made of low pass filter, accepts reference signal from arithmetic processing circuit 28 and generates the reference voltage Io suitable with the target current amount and output to terminal 22.
Further, arithmetic processing circuit 28 is in order to overlap pulse current Δ I on the output current I of discharge lamp 2, during should the overlapping pulses electric current, for reference voltage Io, these current ratio Δs I/I voltage Δ Io be doubly outputed to terminal 23.
In addition, arithmetic processing circuit 28 more detected output voltage V S and preset upper limit value LV
1With lower limit LV
2Comparative result is, when the VS value at LV
1More than or LV
2When following, arithmetic processing circuit 28 is sent to the current control circuit 20 that the work of lighting that will make lighting apparatus for discharge lamp 1 stops with control signal.In addition, when the target current value that calculates when the higher limit L1 of the output current of discharge lamp 2 is above, arithmetic processing circuit 28 adds restriction on reference voltage Io, output current is controlled under the higher limit L1.
Current control circuit 20 equates with the reference voltage Io that is input to terminal 22 for the output current that makes the discharge lamp 2 that is input to terminal 21 detects voltage IS, from terminal 24 output current control signals, controls the output of chopper circuit 16.Further current control circuit 20 is according to the overlapping control signal Δ of the impulse waveform Io that is input to terminal 23, and the pulse current of specified waveform is overlapped on the lamp current.Explanation aftermentioned to this action.
Fig. 3 is that the expression discharge lamp starts to the sequential chart that output voltage stable illuminating state, discharge lamp changes.The action of lighting apparatus for discharge lamp 1 is described with reference to this figure.Because when on lighting apparatus for discharge lamp 1, applying supply voltage, at moment t
0During from lamp connection input terminal 27 input lamp connection signal S1 (becoming High (height) state), discharge lamp 2 all is in non-illuminating state up to this moment, so from the voltage V of chopper circuit 16 outputs by the supply voltage decision
4Further at this voltage V
4Go up overlapping high voltage pulse and become maximum voltage V from firing circuit 19
5, with this voltage V
5Be applied on the discharge lamp 2, start and light discharge lamp 2.Secondly at moment t
1The glow discharge of the little electric current of beginning high voltage, change in voltage is to V
3Further at moment t
2Move to the arc discharge of low-voltage and high-current, become and decide current control mode.In discharge lamp 2, along with the temperature that is caused by these discharges rises, modulating voltage also rises, and chopper circuit 16 moves to decides the electric power control model, and certain electric power is supplied to discharge lamp 2.After this, modulating voltage further rises, at moment t
4Reach constant voltage V
2In addition, for example at moment t
3Later overlapping pulses electric current.
Fig. 4 is the internal structure figure of an example of the current control circuit 20 in the lighting apparatus for discharge lamp 1 of presentation graphs 2.The reference voltage Io suitable with the target current value of trying to achieve from arithmetic processing circuit 28 is input to input terminal 22, and is input to the minus side (fiducial value input side) of error amplifier 30.Output current that again will be suitable with the current value that flows through discharge lamp detects voltage IS and is input to input terminal 21, is input to the positive side (detected value input side) of error amplifier 30.But the low pass filter of voltage IS through being made of resistor 42 and electric capacity 36 amplified by amplifier 31, and further process is input to the positive side of error amplifier 30 by the low pass filter that resistance 43 and electric capacity 37 constitute.In error amplifier 30 so that the mode control output voltage (current controling signal) 24 that 2 voltages of input equate.
Below, illustrate to the overlapping action of the pulse current of discharge lamp 2.
In order to compare, general pulse current overlay method is described at first.If according to general technology, then the overlapping control signal Δ of impulse waveform Io is overlapped on the reference voltage Io suitable with the target current value, be input to the input terminal 22 of current control circuit 20, and be input to the minus side of error amplifier 30.In error amplifier 30, the output current that relatively is input to positive side detects voltage IS and is input to the impulse waveform of the minus side reference voltage Io after overlapping, output current control signal 24.As a result, pulse current is overlapped on the output current of discharge lamp 2, but have boundary because of the response speed of the control loop that is formed by error amplifier 30, so the impulse waveform passivation, it is difficult that pulse overlap at a high speed becomes.
Below, the pulse current overlap action of the present embodiment that improves the problems referred to above is described.In the present embodiment, except that from the terminal 23 input reference voltage Io of special use, the overlapping control signal Δ of impulse waveform Io is input to the positive side of error amplifier 30.Specifically, ON/OFF (on/off) switch 32 is connected with the positive side input of error amplifier 30 with resistor 39.From arithmetic processing circuit 28 permission (enable) signal of switch 32 is input to terminal 23.That is, do not carry out 32 disconnections of pulse current overlap period chien shih switch, carrying out 32 connections of pulse current overlap period chien shih switch.By connecting switch 32, the positive side input voltage of error amplifier 30 only reduces the voltage by resistance 39 decisions.In other words, only carry out the pulse current overlapping period, forcing to reduce positive side input voltage.Force positive side input voltage direction along reduction (recurrence) to original magnitude of voltage of the error amplifier 30 of reduction to work, the result can make the output current of discharge lamp only increase and the suitable amount of voltage decline.In this manner, the output voltage (current controling signal) of the lead-out terminal 24 of error amplifier 30 is almost constant.In the present embodiment promptly,, be not subjected to the influence of the response speed of error amplifier 30 basically, so overlapping pulses electric current at high speed because when the overlapping pulses electric current.
Further as shown in Figure 4, also can the be connected in parallel ON/OFF switch resistor different of a plurality of (N) and the positive side input connection of error amplifier 30 with resistance value.And, from terminal 23 with N[bit] enabling signal be sent to ON/OFF switch 32,33,34.For example, can select N pulse current overlap ratio by make 1 connection in N the switch according to enabling signal.Further, can select 2 by for each combination that is switched on or switched off in N the switch
NIndividual pulse current overlap ratio.
Fig. 5 is the internal structure figure of variation of the current control circuit 20 of presentation graphs 4.With Fig. 4 difference is to have cancelled ON/OFF switch 32,33,34 and resistor 39,40,41, can change the gain of amplifier 31.That is, by with the feedback resistance 301 of amplifier 300 as variable resistor, change the resistance value of feedback resistance 301, the gain of step-down amplifier 300 according to the overlapping control signal Δ of impulse waveform Io.The change in gain amount of this moment is equated with the ratio of overlapping pulse current.Force positive side input voltage direction along reduction (recurrence) to original magnitude of voltage of the error amplifier 30 of reduction to work, the result can make the output current of discharge lamp only increase the amount that gain descends.Even if in this example, the output voltage of error amplifier 30 is also almost constant, at high speed the overlapping pulses electric current.
In the above-described embodiments, the parts (level switching part) of the level of the current detection value by using the discharge lamp that reduces the positive side (detected value input side) that is input to the error amplifier in the current control circuit forcibly, overlapping pulses electric current.In addition, reduce level, the overlap ratio of strobe pulse electric current by switched voltage repeatedly.
According to the foregoing description, even if pulse current overlapped at high speed the passivation that also can suppress its waveform on the discharge lamp electric current.In addition, the flicker in the time of can fully being prevented lamp and lighting and the effect of lamp long lifetime.
The invention is not restricted to the foregoing description, can in the scope that does not break away from its main idea, implement various deformation, in the above-described embodiments, as the gain switching part, having illustrated can convert resistance and change the situation of amplifier gain, but is not limited thereto, and can use voltage drop low technical arbitrarily.
Below, illustrate when pulse current being overlapped on the discharge lamp electric current so that output power becomes the method that certain mode is controlled.
Fig. 6 is the schematic diagram of the lamp current waveform of indicating impulse electric current when overlapping.Fig. 6 A is the situation for the conventional example shown in the comparison (not having the certain control of power), and Fig. 6 B is the situation of present embodiment (having the certain control of power).In addition, because in the cycle of overlapping pulses electric current, regard modulating voltage as certain, so if lamp current one rule electric power is become necessarily.Therefore, here, illustrate to be used to the control that makes lamp current certain.
In Fig. 6 A, solid line 5l is the overlapping preceding lamp current of pulse current, is DC level I
1Certain value (direct current component).Relative therewith, suppose in period T
1In add and the pulse current (segment pulse) of overlapping dotted line 52.The burst length width of pulse current 52 is T
2, pulse amplitude is Δ I (I
2-I
1).Here in period T
1During in to the integrated value of the electric current that discharge lamp is supplied with (below, be called the accumulated current amount), original, will be at the S of direct current component
1=I
1* T
1(the oblique line part S of Fig. 6 A
1Area) in the amount of definition as target, but add the accumulated current amount S of above-mentioned segment pulse thereon
2=Δ I * T
2(the oblique line part S of Fig. 6 A
2Area).As a result, can surpass target accumulated magnitude of current S
1Total accumulated current amount that direct current component and segment pulse are added up and obtained is supplied with on ground.
Therefore shown in Fig. 6 B, reduce the level of direct current component in the lamp current during promptly convenient overlapping pulses electric current, add pulse current, also can be with total accumulated current amount and target accumulated magnitude of current S
1=I
1* T
1The mode that equates is adjusted (correction).That is, by with DC level from I
1Be reduced to I
1', make pulse amplitude be adapted to Δ I ' from Δ I, make the accumulated current amount S of direct current component
1' (the oblique line part S of Fig. 6 B
1' area) and the accumulated current amount S of segment pulse
2' (the oblique line part S of Fig. 6 B
2' area) the accumulated current amount S of sum and target
1(the oblique line part S of Fig. 6 A
1Area) equate.Can try to achieve this condition by following column operations.
As parameter, make pulse overlap than being α=Δ I/I
1, burst length width T
2And period T
1Ratio (duty ratio) be β=T
2/ T
1Here α and β become certain value after by the predetermined coefficients correction.If α=0.1 for example, then revised Δ I ' generally is revised I
1' 10%.The optimum value of α is by decisions such as the kind of discharge lamp and flicker amounts in addition.
Equate from total accumulated current amount, and the pulse overlap condition more certain than α, obtain
I
1×T
1＝I
1’×T
1+ΔI’×T
2 α＝ΔI/I
1＝ΔI’/I
1’
Therefore, each correction value can for
I
1’＝I
1/(1+α×β) (1)
ΔI’＝ΔI/(1+α×β) (2)
In addition as other condition, also be one regularly (at this moment revised α changes) after correction when making pulse amplitude Δ I, can from
I
1×T
1＝I
1’×T
1+ΔI×T
2
Obtain
I
1’＝I
1(1-α×β) (3)
ΔI’＝ΔI (4)
Further, can make burst length width T by correction
2(being duty ratio β) changes also is possible.At this moment, in Fig. 6 B, because can make electric current at level I
1Above area Δ S
2With at level I
1Following area Δ S
1Equate, so can be to satisfy
(I
1’+ΔI’-I
1)T
2＝(I
1-I
1’)(T
1-T
2)
(I
1-I
1’)/ΔI’＝β (5)
Mode to I
1' and Δ I ' revise.
Carry out aforementioned calculation by arithmetic processing circuit 28, with the DC level I of the revised lamp current of trying to achieve like this
1' and pulse amplitude Δ I ' be set at reference voltage Io among Fig. 2.Perhaps in Fig. 4, set I
1' be reference voltage Io, Δ I ' is pulse overlap Δ Io again.
In the above description, illustrated, made period T when modulating voltage being regarded as one regularly
1In integrated value (accumulated current amount) certain method of lamp current, but when modulating voltage not necessarily the time, also consider this change, so that period T
1In the certain mode of integrated value (cumulative power) of lamp electric power, change above-mentioned operational formula and used.
In addition, in the above description, the electric power amount (period T when becoming overlapping pulses electric current not
1In cumulant) and the mode of the electric equipollent electric power during the overlapping pulses electric current control, but be not limited thereto, also can be to become the mode set-up and calculated formula of certain desired electric power amount.
In the above-described embodiments, when overlapping pulses electric current under certain electric power, exist pulse current is applied to interval on the direct current component, but do not have the interval that deducts pulse current.Therefore, even if the response characteristic in current control circuit 20 grades is common characteristic, also can carry out the desired control of lamp current.That is,, also can suppress the passivation of its waveform even if at high speed pulse current is overlapped on the discharge lamp electric current, therefore, the flicker in the time of can fully being prevented lamp and lighting and the effect of lamp long lifetime.
In addition, the configuration example of direct-current discharge lamp situation has been described in the above-described embodiments, but also can be in alternating current discharge lamp situation by same method control lamp current amount.In the situation of alternating current discharge lamp, between chopper circuit 16 and firing circuit 19, insert ac conversion circuit, the AC driving lamp current.And the pulse current of overlapping AC lamp current and same polarity (or opposite polarity), but the method for revising lamp current and pulse current is identical with the situation of above-mentioned direct-current discharge lamp.
In addition, in general, can prolong the method (low power mode) of discharge lamp with by lamp current is reduced to below the common state, but in this low power mode, when carrying out pulse overlap, also can use the method control lamp current amount of the foregoing description.
As mentioned above, formation according to present embodiment, because can keep electric power to carry out High Accuracy Control definitely, prevent the passivation of pulse waveform when proceeding to the pulse overlap of lamp current at high speed, so have remarkable effect aspect flicker when preventing that lamp from lighting and the lamp long lifetime.
Claims (20)
1. a lighting apparatus for discharge lamp to the discharge lamp supply capability, is characterized in that, comprising:
Arithmetic processing circuit is exported the signal relevant with the target current value that supplies to described discharge lamp and is used for pulse current is overlapped pulse control signal on the electric current of supply; With
Current control circuit receives signal and the described pulse control signal relevant with described target current value, and control supplies to the electric current of described discharge lamp, and this current control circuit has:
Error amplifier relatively supplies to the detected value and the described target current value of the electric current of described discharge lamp; With
The level diverter switch during overlapping described pulse current, utilizes described pulse control signal that the incoming level of the described current detection value of importing to described error amplifier is reduced.
2. lighting apparatus for discharge lamp according to claim 1 is characterized in that:
Described current control circuit reduces the incoming level of described current detection value with the amount suitable with overlapping pulse current.
3. lighting apparatus for discharge lamp according to claim 1 is characterized in that:
Described level diverter switch is many groups resistor and the switch that the input side with the described current detection value of described error amplifier is connected in parallel.
4. lighting apparatus for discharge lamp according to claim 3 is characterized in that:
Described level diverter switch is switched the on/off of each switch in described many groups according to described pulse control signal.
5. lighting apparatus for discharge lamp according to claim 1 is characterized in that:
Described level diverter switch is to amplify the amplifier of the described current detection value level that is input to described error amplifier.
6. lighting apparatus for discharge lamp according to claim 5 is characterized in that:
Described level diverter switch is switched this Amplifier Gain according to described pulse control signal.
7. lighting apparatus for discharge lamp according to claim 1 is characterized in that:
Described current control circuit is controlled the cumulative power amount during the overlapping described pulse current.
8. lighting apparatus for discharge lamp according to claim 7 is characterized in that:
Described current control circuit makes the cumulative power amount during overlapping described pulse current, with described during equal length during in the cumulative power amount during the overlapping pulses electric current is not consistent.
9. a lighting apparatus for discharge lamp is lighted to the discharge lamp supply capability, it is characterized in that, comprising:
Control circuit power, control supplies to the electric power of described discharge lamp;
Arithmetic processing circuit, in the cycle of regulation, pulse current is overlapped on the lamp current of described discharge lamp, simultaneously according to the information of voltage and the current information that supply to the electric power of described discharge lamp, described electric power is controlled at certain value, arithmetic processing circuit carries out following control: on the described lamp current that described pulse current is added and when overlapping, reduce the DC level of described lamp current, make that the cumulative power amount in the described specified period is a setting.
10. lighting apparatus for discharge lamp according to claim 9 is characterized in that:
Cumulative power amount when the cumulative power amount when described computing circuit makes overlapping described pulse current in the described specified period equals not overlapping described pulse current.
11. lighting apparatus for discharge lamp according to claim 9 is characterized in that:
When be applied to voltage on the described discharge lamp in the cycle in described regulation one regularly, the described arithmetic processing circuit described pulse current and overlapping that adds on described lamp current reduces the DC level of described lamp current, control accumulated current amount.
12. lighting apparatus for discharge lamp according to claim 9 is characterized in that:
Accumulated current amount during overlapping described lamp current is the long-pending and value of the DC level of described lamp current and described specified period the long-pending time width that adds the amplitude of the above pulse current and described pulse current.
13. an image display device comprises:
Lighting apparatus for discharge lamp;
Image-displaying member, modulation forms the optical image corresponding to picture signal from the light of described lighting apparatus for discharge lamp irradiation;
Drive circuit drives this image-displaying member according to picture signal;
Optical system, the optical projection that will see through described image-displaying member to screen,
Wherein, described discharge lamp device comprises:
Arithmetic processing circuit is exported the signal relevant with the target current value that supplies to described discharge lamp and is used for pulse current is overlapped pulse control signal on the electric current of supply; With
Current control circuit, receive signal and the described pulse control signal relevant with described target current value, control supplies to the electric current of described discharge lamp, and this current control circuit has: error amplifier relatively supplies to the detected value and the described target current value of the electric current of described discharge lamp; With the level diverter switch, during overlapping described pulse current, utilize described pulse control signal that the incoming level of the described current detection value of importing to described error amplifier is reduced.
14. lighting apparatus for discharge lamp according to claim 13 is characterized in that:
Described current control circuit reduces the incoming level of described current detection value with the amount suitable with overlapping pulse current.
15. lighting apparatus for discharge lamp according to claim 13 is characterized in that:
Described level diverter switch is many groups resistor and the switch that the input side with the described current detection value of described error amplifier is connected in parallel.
16. lighting apparatus for discharge lamp according to claim 15 is characterized in that:
Described level diverter switch is switched the on/off of each switch in described many groups according to described pulse control signal.
17. lighting apparatus for discharge lamp according to claim 13 is characterized in that:
Described level diverter switch is to amplify the amplifier of the described current detection value level that is input to described error amplifier.
18. lighting apparatus for discharge lamp according to claim 17 is characterized in that:
Described level diverter switch is switched this Amplifier Gain according to described pulse control signal.
19. lighting apparatus for discharge lamp according to claim 13 is characterized in that:
Described current control circuit is controlled the cumulative power amount during the overlapping described pulse current.
20. lighting apparatus for discharge lamp according to claim 19 is characterized in that:
Described current control circuit makes the cumulative power amount during overlapping described pulse current, with described during equal length during in the cumulative power amount during the overlapping pulses electric current is not consistent.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005350348A JP2007157475A (en) | 2005-12-05 | 2005-12-05 | Discharge lamp lighting device |
| JP2005350348 | 2005-12-05 | ||
| JP2006022078 | 2006-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1980513A true CN1980513A (en) | 2007-06-13 |
Family
ID=38131455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101064415A Pending CN1980513A (en) | 2005-12-05 | 2006-07-24 | Discharge lamp lighting device and projection type image display apparatus having the same |
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| Country | Link |
|---|---|
| JP (1) | JP2007157475A (en) |
| CN (1) | CN1980513A (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03156897A (en) * | 1989-11-15 | 1991-07-04 | Matsushita Electric Works Ltd | Lighting device for high-pressure discharge lamp |
| JPH0574583A (en) * | 1991-09-12 | 1993-03-26 | Tdk Corp | Lighting apparatus of hid lamp |
| JP4223760B2 (en) * | 2001-08-28 | 2009-02-12 | フェニックス電機株式会社 | Discharge lamp lighting method, discharge lamp lighting circuit, light source device using the circuit, and optical apparatus including the light source device |
| JP2005267933A (en) * | 2004-03-17 | 2005-09-29 | Ushio Inc | Discharge lamp lighting device |
| JP2005276594A (en) * | 2004-03-24 | 2005-10-06 | Mitsubishi Electric Corp | Discharge lamp lighting device |
-
2005
- 2005-12-05 JP JP2005350348A patent/JP2007157475A/en active Pending
-
2006
- 2006-07-24 CN CNA2006101064415A patent/CN1980513A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007157475A (en) | 2007-06-21 |
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Application publication date: 20070613 |