WO2002102120A1 - Dispositif d'amorçage d'une lampe a decharge et dispositif projecteur - Google Patents
Dispositif d'amorçage d'une lampe a decharge et dispositif projecteur Download PDFInfo
- Publication number
- WO2002102120A1 WO2002102120A1 PCT/JP2002/005746 JP0205746W WO02102120A1 WO 2002102120 A1 WO2002102120 A1 WO 2002102120A1 JP 0205746 W JP0205746 W JP 0205746W WO 02102120 A1 WO02102120 A1 WO 02102120A1
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- Prior art keywords
- discharge lamp
- voltage
- current
- predetermined
- detection
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/2881—Load circuits; Control thereof
- H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/382—Controlling the intensity of light during the transitional start-up phase
- H05B41/388—Controlling the intensity of light during the transitional start-up phase for a transition from glow to arc
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention is, c BACKGROUND
- a discharge lamp lighting instrumentation i3 ⁇ 4 lighting a discharge lamp and a projector device the discharge lamp is widely used in various fields, for example, It is also used as a light source for LCD projector devices.
- the current control method when the discharge lamp is turned on is approximately 1.5 to 2 times the steady-state current of the discharge lamp immediately after induction when the lamp lighting switch is turned on.
- the set value of the current to be fixed after ignition may be reduced.
- the present invention has been made in view of the above-mentioned conventional problems, and is intended to provide a discharge lamp lighting device and a projector device which are inexpensive, have excellent reliability, and can prolong the life of the discharge lamp. The purpose is to provide.
- a discharge lamp lighting device for lighting a discharge lamp, and applies a starting voltage to the discharge lamp at the time of starting to light the discharge lamp.
- Starting means voltage detecting means for detecting the voltage of the discharge lamp, and current control means for controlling the current supplied to the discharge lamp based on the detection result of the voltage detecting means, wherein the current control means is provided after the ignition Controlling the current supplied to the discharge lamp based on the detection result of the voltage detection means, and changing the current supplied to the discharge lamp to a predetermined current value larger than the steady current of the discharge lamp. Up to a predetermined rate of increase continuously.
- the discharge lamp lighting device configured as described above includes current control means for controlling the current supplied to the discharge lamp based on the detection result of the voltage detection means.
- this control means the discharge lamp Based on the voltage detection result, control is performed to continuously change the current head supplied to the discharge lamp after the induction to a predetermined current value larger than the steady-state current of the discharge lamp so as to have a predetermined increase rate based on the voltage detection result. .
- the current amount is continuously changed at a predetermined increase rate to a predetermined current value which is larger than the steady-state current of the discharge lamp after the initiation. To supply current to the discharge lamp.
- the voltage correction setting means is configured to The current supplied to the discharge lamp is continuously changed at a predetermined increase rate by correcting the detection voltage after the session from a predetermined voltage value so as to continuously decrease at a predetermined decrease rate. it can.
- control means is provided with power setting control means for controlling a target power value of the power setting means for controlling the current supplied to the discharge lamp
- power setting: control means comprises: By controlling the target power value after the above-mentioned guidance so as to increase continuously at a predetermined increase rate, the current supplied to the discharge lamp is continuously changed at a predetermined increase rate. Can be realized.
- this discharge lamp lighting device i by controlling the amount of current in this way, in this discharge lamp lighting device i, the current supplied to the discharge lamp gradually increases, so that the electrodes of the discharge lamp gradually and gradually. It will be warmed. As a result, the heat load on the electrodes is reduced, and the thermal fatigue of the electrodes is reduced, so that the consumption of the electrodes is reduced.
- a projector device that projects the light emitted from the discharge lamp to the outside can be configured using the discharge lamp lighting device having the above-described features.
- a device that modulates light emitted from the discharge lamp based on an input video signal and emits the modulated light can be used.
- FIG. 1 is a block diagram showing a schematic configuration of a discharge lamp lighting device according to an embodiment of the present invention.
- FIG. 2 is a schematic cross-sectional view showing one configuration example of the discharge lamp.
- FIG. 3 is a characteristic diagram showing current and voltage states in a conventional discharge lamp lighting device.
- FIG. 4 is a characteristic diagram showing states of current and voltage in the embodiment of the discharge lamp lighting device according to the present invention.
- FIG. 5 is a configuration diagram illustrating a configuration example of a control circuit.
- FIG. 6 shows the input V i to the control circuit 6 and the output V from the control circuit 6.
- FIG. 4 is a view showing a displacement state of the slab.
- FIG. 7 is a block diagram showing a configuration example of a discharge lamp lighting device according to an embodiment of the present invention.
- FIG. 8 is a block circuit diagram showing an example of a main circuit configuration in the case where control is performed by the voltage correction setting circuit of FIG. 7 to gradually increase the current after the lamp lighting switch ON.
- FIG. 9 is a waveform chart for explaining the operation of the circuit of FIG.
- FIG. 10 is a block circuit diagram showing an example of a circuit configuration of a main part in the case where control is performed by the power setting control circuit of FIG. 7 to gradually increase the current after the lamp lighting switch ON.
- FIG. 11 is a waveform diagram for explaining the operation of the circuit of FIG.
- FIG. 1.2 is a block diagram showing a schematic configuration of a projector device using a discharge lamp as an embodiment of the present invention.
- BEST MODE FOR CARRYING OUT THE INVENTION the best mode for carrying out the present invention will be described in detail with reference to the drawings.
- FIG. 1 is a block diagram showing a schematic configuration of a discharge lamp lighting device according to an embodiment of the present invention.
- the discharge lamp lighting device to which the present invention is applied includes an igniter 2 serving as a starting means for applying a starting voltage to the discharge lamp 1 to start the discharge lamp 1 at startup, and a voltage applied to the discharge lamp 1.
- a voltage detection circuit 3 which is a voltage detection means for detecting the current
- a current detection circuit 4 which is a current detection means for detecting a current flowing through the discharge lamp 1
- It is provided with a current control circuit section 5 which is a current control means for controlling the current flowing through the discharge lamp 1 based on the output result (or controlling the power supplied to the discharge lamp 1).
- the current control circuit section 5 includes a control circuit 6, a PWM controller 7, and a down converter 8, which are connected in this order.
- a DC power supply 9 is connected to an input terminal of the downconverter 8, so that a mist flow is supplied to the discharge lamp lighting device.
- the DC power supply 9 for example, a power supply configured to have a voltage of about 300 V to 400 V by an active filter output or the like can be used.
- the input terminal of the igniter 2 is connected to the output terminal of the downconverter 8, and after the DC current supplied from the DC power supply 9 is controlled and converted to an appropriate magnitude through the downconverter 8, Supplied to igniter 2.
- the output terminal of the igniter 2 is connected to the input terminal of the discharge lamp 1, and the direct current flowing from the down converter 8 to the igniter 2 is supplied to the discharge lamp 1 as it is.
- the discharge lamp 1 includes a connector 11, a reflector 12, an electrode 13, and a heat-resistant glass 14 covering the electrode 13, as shown in FIG. It is configured to supply an induction voltage, a lamp current, etc. Various gases are sealed in the heat-resistant glass 14, and the electrode 13 is configured to discharge in the heat-resistant glass 14.
- the discharge lamp to which the discharge lamp lighting device according to the present invention can be applied is not particularly limited, and the voltage changes until stable, for example, a discharge lamp such as a metal halide lamp, a high-pressure mercury lamp, and a xenon lamp. Any of them can be used.
- a discharge lamp such as a metal halide lamp, a high-pressure mercury lamp, and a xenon lamp. Any of them can be used.
- a voltage detection circuit 3 and a current detection circuit 4 are branched, and the output terminal of the voltage detection circuit 3 and the current detection circuit The output terminals of 4 are respectively connected to the input terminals of the control circuit 6 in the current control circuit section 5.
- the current control circuit unit 5 controls the current supplied to the discharge lamp 1 after the induction.
- the current control circuit section 5 includes the control circuit 6, the PWM controller 7, and the down converter 8, which are connected in this order. Then, the control circuit 6 starts controlling the current supplied to the discharge lamp 1 based on the detection result of the voltage detection means, and reduces the voltage supplied to the discharge lamp 1 to an appropriate amount. The current is controlled based on the detection result of the detection circuit 3.
- the control of the current supplied to the discharge lamp 1 is performed by controlling the voltage applied to the discharge lamp 1. That is, in the discharge lamp lighting device, the amount of current supplied to the discharge lamp 1 is controlled by changing and controlling the voltage applied to the discharge lamp 1.
- the current control circuit section 5 controls the electric power supplied to the discharge lamp 1 to be a predetermined constant value, and the detection voltage of the voltage detection circuit 3 and the current detection circuit 4
- the operation of the downconverter 8 is controlled so that the product (detected power value) is multiplied by the detected current (power value).
- the resistance value of the discharge lamp 1 immediately after the induction is extremely low, the detection voltage value decreases, and the current value for supplying constant power becomes too large.
- the current immediately after induction is limited to, for example, approximately 1.5 to 2 times the steady current.
- the conventional discharge lamp lighting device uses the current supplied to the discharge lamp immediately after ignition (time t is ) when the discharge lamp is turned on (the lamp current a shown by the solid line in the figure). ) Is fixed to approximately 1.5 to 2 times the steady-state current of the discharge lamp in the steady state, and control is performed to continue to supply current to the discharge lamp. After a certain period of time, the discharge state of the discharge lamp is stabilized, and when the voltage of the discharge lamp (the lamp voltage b indicated by a broken line in the figure) rises to a predetermined level, the current supplied to the discharge lamp is reduced. Was controlled to return to the steady state current.
- the set value of the current to be fixed after the initiation may be reduced.
- the discharge state of the discharge lamp is stabilized as the power supplied to the discharge lamp increases, the voltage of the discharge lamp rises extremely slowly if the set value of the current to be fixed after the initiation is reduced. There is a problem that it takes time to stabilize the discharge lamp.
- this discharge lamp lighting device stabilizes discharge lamp 1 in the same time as the conventional discharge lamp lighting device after the induction, and one discharge lamp 1 has a large current.
- the control is performed to reduce the flowing time.
- the current (the amount of current supplied to the discharge lamp 1 after time ti J (the lamp current indicated by the solid line in the figure) a) is changed continuously at a predetermined increase rate.
- a predetermined value (hereinafter, referred to as a maximum current value) larger than the steady-state current of the discharge lamp 1, that is, When the power state stabilizes and the voltage of the discharge lamp 1 (lamp voltage b in the dashed line in the figure) rises to a predetermined level, the amount of current is reduced at a predetermined rate to the steady current of the discharge lamp 1 and maintained. Let it.
- this discharge lamp lighting device by controlling the amount of current in this way, in this discharge lamp lighting device, the current supplied to the discharge lamp 1 gradually increases, so that the electrode 13 of the discharge lamp 1 gradually changes. It will be made and warmed. As a result, the heat load on the electrode 13 can be reduced, so that the thermal fatigue of the electrode 13 can be reduced, and the consumption of the electrode 13 can be reduced. As a result, in this discharge lamp lighting device, it is possible to prevent the life of the discharge lamp 1 from being shortened due to the consumption of the electrode 13, and to prolong the life of the discharge lamp 1.
- the maximum current value and the rate of increase of the current are not particularly limited. What is necessary is just to set suitably according to various conditions, such as 1 kind.
- the time until the discharge state of discharge lamp 1 stabilizes depends on the type of discharge lamp 1, the maximum current value, although there is a slight difference depending on various conditions such as the rate of increase of the current, there is only a few seconds at most, so that there is no problem in practical use of the discharge lamp 1.
- this discharge lamp lighting device it is possible to stabilize the discharge lamp 1 at the same time as the conventional discharge lamp lighting device.
- the current amount may be reduced after maintaining the maximum current value for a predetermined time, or the current amount may be reduced when the maximum current value is reached. This may also be set as appropriate in accordance with various conditions such as the rare type of the discharge lamp 1 in correlation with the increase rate of the current.
- control circuit 6 of the current control circuit section 5 for example, a configuration having a circuit as a main part as shown in FIG. 5 can be used.
- the circuit shown in FIG. 5 shows a main part of the control circuit 6, and the input Vi to the circuit shown in FIG. 5 is a voltage based on the detection result of the voltage detection circuit 3 as described later.
- V K V B XR 2 / (R i + R 2 )
- V K V B XR 2 / (R i + R 2 )
- the circuit of FIG. 5 is more specifically described in conjunction with FIG. 7, FIG. 10 and FIG. This corresponds to a power setting control circuit 60 described later.
- the value of the resistor R, and R 2 can be freely set and changed.
- the values of the resistors Ri and R 2 are set as the resistance R.
- the voltage corresponding to the supply voltage to the discharge lamp 1 can be controlled to a desired “V k + V F ”. Therefore, output V. That is, the upper limit of the voltage corresponding to the voltage applied to the discharge lamp 1 can be controlled.
- the current supplied to the discharge lamp 1 can be controlled by controlling the voltage applied to the discharge lamp 1, so that the upper limit value of the voltage applied to the discharge lamp 1 is controlled.
- the upper limit of the current supplied to the discharge lamp 1 can be controlled.
- the resistance R By changing the value of V, the output V from the circuit shown in Fig. 5 of control circuit 6. Can be set to a desired increase rate. Therefore, by controlling the rate of increase in the voltage applied to the discharge lamp 1, the rate of increase in the current supplied to the discharge lamp 1 can be controlled to a desired rate.
- control circuit 6 since the main part configuration of the control circuit 6 can be constituted by a simple circuit as shown in FIG. 5, it is excellent in reliability and can be manufactured at low cost. It is.
- the output V controlled by the control circuit 6 as described above. Is input to the PWM controller 7 and is used as a control signal of the PWM controller 7.
- the PWM controller 7 receives the output V from the control circuit 6.
- the duty ratio of the ONZOFF of the semiconductor switch provided in the PWM controller 7 is controlled in accordance with the control signal, and this controlled signal is input to the down converter 8.
- the down converter 8 controls the value of the DC current supplied from the DC power supply 9 to a predetermined value based on the signal input from the PWM controller 7 and outputs it.
- this discharge lamp lighting device it is possible to supply the discharge lamp 1 with a current controlled by the above-described feedback control so as to continuously change at a desired increase rate.
- control circuit 6 is not limited to this, and various configurations having the above-described functions are possible. Can be used.
- this discharge lamp lighting device realizes a discharge lamp lighting device that is excellent in reliability due to its inexpensive configuration and that can extend the life of the discharge lamp 1. Next, the operation of the discharge lamp lighting device will be described.
- a predetermined DC current is supplied from the DC power supply 9 to the igniter 2 to charge the capacitor in the igniter 2.
- a high voltage is generated, and this high voltage is applied to the discharge lamp 1.
- the application of this high voltage causes dielectric breakdown between the electrodes 13 of the discharge lamp 1 and causes breakdown.
- the charging load of the capacitor in the igniter 2 is discharged via the discharge lamp 1, and power is continuously supplied to the discharge lamp 1, and the discharge lamp 1 is turned on.
- the lighting of the discharge lamp 1 is detected as a voltage change in the voltage detection circuit 3, and the detection result is input to the control circuit 6 of the current control circuit unit 5.
- the current supplied to the discharge lamp 1 is detected by the current detection circuit 4.
- the detection result of the current detection circuit 4 is input to the control circuit 6 of the current control circuit section 5.
- the voltage applied to the discharge lamp 1 is detected by the voltage detection circuit 3.
- the detection result of the voltage detection circuit 3 is input to the control circuit 6 of the current control circuit unit 5.
- the control circuit 6 of the current control circuit unit 5 starts controlling the current supplied to the discharge lamp 1 after the initiation based on the detection result input from the voltage detection circuit 3 and supplies the current to the discharge lamp 1.
- Current is continuously changed at a predetermined increase rate. Further, when the current value reaches the maximum current value, that is, when the discharge state of the discharge lamp 1 is stabilized, and when the voltage of the discharge lamp 1 rises to a predetermined level, the amount of current is reduced to the steady current of the discharge lamp 1. Decrease at a predetermined rate and maintain it.
- control signal controlled by the control circuit 6 as described above is input to the PWM controller 7 and used as a control signal of the PWM controller 7.
- the PWM controller 7 controls the ONZOFF duty ratio of the semiconductor switch provided in the PWM controller 7 in accordance with the input V0 of the control circuit 6 and converts the controlled signal into a down converter 8 To enter.
- the down converter 8 controls the value of the DC current supplied from the DC power supply 9 to a predetermined value based on the control signal input from the PWM controller 7, II Output to discharge lamp 1 via igniter 2. Thereby, the lighting of the discharge lamp 1 is maintained.
- the discharge lamp lighting device configured as described above can greatly reduce the time when a large current that is larger than the steady current flows through the discharge lamp as compared with the conventional discharge lamp lighting device. it can.
- the load of heat on the electrode can be reduced, and the thermal fatigue of the electrode can be reduced, so that the consumption of the electrode can be reduced. Therefore, in this discharge lamp lighting device, it is possible to prevent the life of the discharge lamp from being shortened due to the consumption of the electrodes.
- the current control means in this discharge lamp lighting device can be realized with a simple configuration, it is excellent in reliability and can be manufactured at low cost.
- FIG. 7 is a block diagram showing a more specific configuration example of the discharge lamp lighting device shown in FIG. Parts in FIG. 7 corresponding to the respective parts in FIG. 1 are denoted by the same reference numerals.
- a DC voltage of about 300 V to 400 V, specifically, a DC voltage of, for example, 370 V is obtained. It is output and sent to downconverter 8.
- the downconverter 8 is a step-down switching power supply, which switches an input DC voltage at a frequency of, for example, about 50 kHz to 100 kHz, and then smoothes the voltage so that the lamp (discharge lamp) is required for normal lighting. For example, voltage conversion (step-down) to a DC voltage of about 50 V to 100 V is performed.
- the switching operation of the down converter 8 is performed by controlling the pulse width and the frequency from the control circuit 70 (corresponding to the PWM controller 7 and the like in FIG. 1) so that the output power becomes constant. Controlled.
- the output from the down converter 8 is sent to the igniter 2 in the induction section via the full bridge 22.
- the igniter 2 has an output transformer (not shown) for the ignition.
- a pulse voltage is supplied to the primary winding, and from the secondary winding (output winding) to 5 k to 20 k.
- a pulse signal of about V is generated and output.
- the output from the igniter 2 is supplied to the lamp (discharge lamp) 1.
- the igniter control circuit 21 in FIG. 7 is for stopping the ignition operation in response to the lamp ON detection circuit 23 detecting that the lamp has been turned on by the ignition.
- the example of FIG. 7 shows a circuit configuration for an AC lamp. In the case of a circuit configuration for a DC lamp, the full bridge 22 becomes unnecessary.
- Voltage detection circuit 3 detects the divided voltage output from the voltage dividing resistors R 3 1, R 3 2, the detection voltage output may multipliers 4 2, the power setting switching circuit 6 2, and the lamp ON detection circuit 2 3 Sent to The detection output from the lamp ON detection circuit 23 is sent to the voltage correction setting circuit 30, the power setting control circuit 60, and the igniter control circuit 21.
- the output terminal of the voltage correction setting circuit 3 0 through the diode D 3 1, is connected to the output terminal of the voltage detection circuit 3, the voltage correction setting circuit 3 0 of the output voltage + V F (Daio over de forward The higher one of the direction voltage drop) and the detection voltage from the voltage detection circuit 3 is sent to the multiplier 42 and the power setting switching circuit 62.
- the current detection circuit 4 detects an output current from the down converter 8 by detecting a voltage generated at the resistor 41, and sends the output current to the multiplier 42.
- the multiplier 42 calculates the output power from the down converter 8 by multiplying the detection voltage from the voltage detection circuit 3 by the detection voltage from the current detection circuit 4.
- Each output from the power setting control circuit 60, the power setting switching circuit 62, and the multiplier 42 is sent to the power setting circuit 61.
- the output from the power setting circuit 61 is sent to the control circuit 70 as target power, and the control circuit 70 controls the switching operation (eg, pulse width) of the down converter 8 by controlling the switching operation (pulse width, etc.). Then, control is performed so that the output power from down converter 8 finally reaches the target power.
- the current supplied to the discharge lamp after the above-mentioned induction or after the lamp is turned on is larger than the steady current of the discharge lamp. Up to a certain current value, at a certain increase rate Control to increase continuously.
- FIG. 7 shows both the voltage correction setting circuit 30 and the power setting control circuit 60, at least one of them may be used, and the other may be omitted. More specifically, it may be used either voltage correction setting circuit 3 0 and either configuration consisting Daio one de D 31, or consist power setting control circuit 6 0 ⁇ beauty power setting switching circuit 6 2 configuration.
- the multiplier 42 in FIG. 7 and the voltage correction setting “ ⁇ circuit 30, or the power setting control circuit 60, the power setting circuit 61, the power setting circuit 62, etc. It is provided in the current control circuit 5, and can be considered to correspond approximately to the control circuit 6.
- the control circuit 70 in FIG. 7 substantially corresponds to the PWM circuit 7 in FIG.
- the present invention is not limited to the pulse width control, but controls the output current (or output power) from the downconverter 8 by frequency control, pulse width and frequency control.
- FIG. 8 shows an example of a main circuit configuration example in the case where the voltage correction setting circuit 30 performs control such that the discharge lamp current gradually increases when the lamp lighting switch is turned on or after the above-mentioned induction.
- FIG. 9 is a waveform diagram for explaining the operation of FIG.
- the voltage indicates the output voltage from the DC power supply (DC power supply) 9 in FIG. 7, and the voltage V 2 and the current It indicate the output voltage and the output current from the down converter 8 in FIG. 7, respectively.
- the voltage V 3 is 8 odor Te indicates the voltage supplied a voltage detector to the multiplier 4 2 by the dividing resistor R 31, R 32, voltage V- is the voltage correction setting circuit 3 in 0
- the partial pressure for the voltage detection resistor R: t I the connection point of R 32 is connected the anode of the diode D 2 of the clamp, and the force saw de diodes D 31, Daio force Sword once D 2 is connected to the + Vcc terminal of the circuit power supply, Anodo da Io de D 31 is connected to the voltage dividing resistor R 3, the connecting point of the voltage correction setting circuit 3 within 0. Therefore, the voltage V 3 at the connection point of the voltage dividing resistor R 3 , the voltage dividing detection voltage detected by the voltage dividing resistors R 31 and R 32 , the anode of the diode D 2 Either the voltage or the diode power source voltage is supplied to the multiplier 42 as a final detection voltage.
- the circuit power supply voltage + Vcc is set to, for example, +15 V, but is not limited to this.
- Voltage correction setting circuit 3 0 + resistor divider between Vcc power supply terminal and ground (GND) terminal is inserted and connected, c
- This capacitor C capacitor d is connected in parallel with the resistor, PNP type transistor T r E Mi jitter during one collector is connected, the output from the lamp oN detection circuit 2 3 in the base of the transistor Tr 3 is supplied.
- the output from the lamp ON detection circuit 23 is 0 V when OFF and + Vcc (for example, +15 V) when ON. Therefore, when the lamp is off, transistor Tr 3 is turned on and capacitor C! And short-circuited ends of the (short), after the lamp ON the charge in the capacitor C transistor Tr 3 is OFF is accumulated.
- the output voltage from the DC power supply (DC power supply) 9 in FIG. 7 is reduced by outputting a predetermined DC voltage, for example, 370 V, from the state before the lamp lighting switch is turned on. Supplied to converter 8.
- a predetermined DC voltage for example, 370 V
- the igniter 2 starts the above-described ignition operation, so that the resistance value of the discharge lamp 1 decreases and the supply voltage to the discharge lamp 1 decreases. I do.
- the lamp ON detection circuit 23 in FIG. 7 detects this voltage drop, and outputs a lamp ON detection signal, for example, a signal that rises from 0 V to + Vcc (for example, +15 V). This lamp ON detection signal is sent to the igniter control circuit 21 of FIG.
- the output voltage V 2 from the down converter 8 reaches, for example, about 300 V by the above-described induction operation, as shown in FIG.
- the duration Td drops to about 10 V, but it may take about 1 to 3 seconds in some cases.
- the output current I from the downconverter 8 once rises to about 20 A and then falls.
- Lamp ON detection signal from the lamp ON detection circuit 2 3 in this case is also sent to the transistor Tr 3 of the voltage correction setting circuit 3 0 8, the transistor Tr 3 is turned OFF, charge is accumulated in the contact condenser
- the voltage correction setting circuit 30 The voltage V at the connection point of the resistors R 3 and R changes as shown in FIG. 9, and the final detection voltage V 3 supplied to the hook 42 changes accordingly as shown in FIG. .
- the circuit power supply voltage + V (e.g. + 1 5 V) only from the forward 3 ⁇ 4 hypotensive content of diode D 2 high charge ⁇ , i.e.,
- V + Vcc + V
- the voltage V ⁇ at the connection point of the resistor R 3 and the resistance value of the resistor R a and the resistance value of the resistor R a It gradually decreases based on the time constant according to the capacitance value of the capacitor C t. That is, the voltage V ,, at the connection point of the resistor R 3 , is a predetermined time T AA determined by the time constant from the circuit power supply voltage + Vcc (for example, +15 V) at the ON time t ON. Later, the above voltage + Vcc is divided by the resistor R 3 , and the divided voltage V
- V + VccX (R 32 Bas R 31 + R 32)) - V
- This voltage V 3 is sent to a multiplier 42 as a final detection voltage, and is multiplied by the detection current output from the current detection circuit 4 in FIG. 7 to obtain a target current for power control. Power. Therefore, when the detection voltage output that gradually decreases during the time T AA is sent to the multiplier 42, the down converter 8 outputs the output current I through the control circuit 70 from the power setting circuit 61 in FIG. As shown in Fig. 9, t is controlled so as to gradually increase. This output current is controlled so as to continuously increase the current supplied to the discharge lamp 1 to a steady current, for example, +3 A which is 1.5 times +2 A. These current values are examples, and the present invention is not limited to these values.
- the interval T A the time of lamp ignition switch ON from (t. N) to time t tl is the lamp resistance is low lamp voltage constant period, for example at about 2 0 s 9 0 seconds
- the section T B from time t to time t 12 a ramp voltage rising period of the resistance value of the lamp increases, these intervals T lambda, the sum of the T beta, for example, 3 0 seconds to 2 minutes.
- the present invention is not limited to these numerical values.
- the ward question T C of the time t 12 after the discharge state of the lamp is a section of the stable steady state.
- Output voltage V 2 from down converter 8 in this steady state is, for example, +70 V, and output current It is +2 A.
- the present invention is, of course, not limited to these numerical values. Further, the voltage detection output to the multiplier 4 2 V. ', And, the voltage V 1 3 which definitive in the steady state, voltage dividing resistors R 3 1, the voltage detected by the R 32 for the voltage detection, to That is,
- V! 3 V 2 X (R 3 2 / (R 31 + R 32>)
- FIG. 0 and FIG. 11 show a specific example for controlling the power setting control circuit 60 in FIG. 7 so that the discharge lamp current after the above-mentioned induction gradually increases.
- FIG. 10 is a block circuit diagram showing a specific example of the power setting control circuit 60 and its peripheral circuits
- FIG. 11 is a diagram for explaining the operation of the circuit of FIG. 10.
- connection point of the voltage-dividing resistors R 31 and R 32 for voltage detection is connected to the anode of a diode D 2 for clamping, and the power source of the diode D 2 is + Vcc of the circuit power supply. Connected to terminal.
- the voltage correction setting circuit 30 is not used.
- the voltage Ve at the connection point of the voltage dividing resistor R 3 becomes either the voltage dividing detection voltage detected by the voltage dividing resistor R 31 or the anode voltage of the diode D 2 , and this voltage V 6 I Multipliers 42 and This is supplied to the power setting switching circuit 62.
- the output from the lamp ON detection circuit 23 is supplied to the power setting control circuit 60 as the input voltage Vi.
- the resistor R 9 , the capacitor C 2 , the diode, and the resistor R 7 R 8 are connected to the resistor [FIG. . , Capacitor C :. , A diode D and a resistor Ri R 2, respectively.
- the output voltage V 5 (V in FIG. 5) from the power setting control circuit 60 is supplied to the power setting circuit 61.
- Lamp lighting switch ON time t As the N before and after operation, the output voltage V 2 and an output current IL from the down converter 8 of Figure 7 is that described in conjunction with FIG 9 and substantially Similarly, also, from the lamp ON detection circuit 2 3 Is the lamp lighting switch ON time t. 0 V at OFF before N , lamp ON switch ON time t. When ON after N, it becomes + Vcc (for example, +15 V). Dividing resistors R 3, the voltage V 6 of the contact ⁇ of, as shown in FIG.
- the output voltage V 5 (V in FIG. 5) of the power setting control circuit 60 is determined by dividing the output V i from the lamp ON detection circuit 23 by the resistance R 9 , the capacitor C 2, and the resistance R 7 R 8 . since the output is integrated by the time constant circuit, as shown in FIG. 1 1, the lamp lighting sweep rate Tutsi oN time t oN with a predetermined time constant, the voltage waveform so as to increase to continuous voltage V 21 .
- the voltage V 21 is the resistance R 7 and divided voltage power supply voltage + Vcc is the partial pressure by R 8 (+ VccX R 7 / (R 7 + R 8)) and diode D- forward voltage drop V F plus the voltage (+ VccX R 7 / (R 7 + R 8 ) + V F ).
- the power supply voltage VB is divided by the resistor and R 2.
- the divided voltage V K (Vk V B XR 2 / (R! + R2)) and the forward voltage drop V F of diode KD It is equivalent to "VK + VF".
- the output voltage V 5 of the power setting control circuit 6 0 is sent to the power setting circuit 61, the control target power is set, the target power output (detection power) child from multiplier 4 2 Thus, the output power from down converter 8 in FIG. 7 is controlled. That is, the control 0 target power in the power setting circuit 6 in 1. is set according to the output voltage V 5 from the power setting configuration Toro Lumpur circuit 6 0.
- the present invention is not limited to these numerical values.
- FIG. 12 is a block diagram showing a schematic configuration of a projector device using the above-described discharge lamp lighting device.
- the projector device shown in FIG. 12 equalizes the lamp (discharge lamp) 101 that is driven to emit light by the above-described discharge lamp lighting device, and the light emitted from the lamp 101.
- Integrator 1 2 1 that illuminates the object L9
- Condenser lens 1 2 2 that converges the principal ray emitted from lessnessrator 1 2 1 toward each part of the object so as to be parallel, and illuminated by the light emitted from condenser lens 1.2 2
- a light valve (123 to 125) that modulates and outputs incident light based on an input video signal, and a screen 1 that outputs video light output from the light valve.
- a projection lens 1 26 for projecting the projection lens 2 7.
- the integrator 121 is composed of, for example, a multi-lens array in which element lenses are arranged vertically and horizontally in a matrix, and outputs light emitted from the lamp 101 with an intensity distribution at each corresponding location. Each of the element lenses illuminates the entire light bulb, thereby making the light incident on the light bulb uniform.
- the light valve is configured to include the incident-side polarizing plate 123, the liquid crystal panel 124, and the output-side polarizing plate 125, and the predetermined light passing through the incident-side polarizing plate 123.
- the liquid crystal panel 124 rotates (polarizes) the polarization direction of the light of the polarization direction of the light with the voltage applied based on the video signal, and the polarization component of the light with the rotated polarization direction in the predetermined direction is emitted.
- an output (outgoing light) is generated by modulating the incident light based on the video signal.
- a PS converter that converts the light emitted from the lamp into light having a substantially predetermined polarization direction is provided near the integrators 1.2 and 1. Is also good.
- the color separation means including a dichroic mirror and the color synthesizing means including a dichroic prism correspond to the three primary colors.
- the projector device may be configured using the three light valves.
- the modulation of the LCD panel 124 is performed by decoding the video signal input to the input terminal 1.16, for example, a video signal, and converting it into the three primary colors of RGB.
- a video signal processing means 1 17 that performs processing such as conversion of the number of pixels according to the element array of 24, and a voltage is applied to each pixel of the liquid crystal panel 124 by the output from this video signal processing means 117. This is performed by a well-known configuration with a driver 118 that drives the motor.
- the light emitted by turning on the lamp 101 is transmitted to the integrator
- the direction of the principal ray of the light (luminous flux) going to each part of the liquid crystal panel 1 24 is made almost parallel by the condenser lens 1 2
- the light passes through the LCD panel 124.
- the light passing through the output polarizer 125 is projected onto the screen 127 by the projection lens 126 projecting the image of the liquid crystal panel 124 onto the screen 127.
- the projector device displays an image based on the input image signal on the screen 127.
- the starting system has the above-described discharge lamp lighting device that is operated by the DC power supply 109 that supplies electric power converted into a DC voltage from the external AC power supply 110.
- the lamps 101, igniter 102, voltage detection circuit 103, current detection circuit 1.04, downconverter 108, and DC power supply 109 in 2 are the same as those shown in Figs. 1 and 7 above. They correspond to a discharge lamp 1, an igniter 2, a voltage detection circuit 3, a current detection circuit 4, a down converter 8, and a DC power supply 9, respectively.
- the power control circuit 106 and the PWM controller 107 in FIG. 12 are the control circuit 6 and the PWM controller 7 in FIG. 1 described above, or the multiplier 42 and the power setting circuit 6 in FIG.
- the starting system shown in Fig. 12 has a CPU 113 that is a system microcomputer that controls the entire system of the projector device, and a power switch that gives an ON command (or OFF command) to the CPU 113 by operating the user. 1 and a standby power supply 1 1 1.
- the CPU 113 controls the entire system.
- a starting control means for controlling the operations of the DC power supply 109, the PWM controller 107, and the igniter 102 is provided.
- the CPU 113 receives an ON command from the power switch 112 according to a system control program read from a ROM (not shown), and outputs a predetermined control command to a control target.
- the CPU 113 has a timer function and controls the timing of control commands.
- the start (or stop) of the power supply to the downconverter 108 is controlled by the command S1 from the CPU 113.
- the semiconductor switch provided on the output side from the active filter to the downconverter 108 is ON / OFF controlled by the command S1.
- the PWM controller 107 of the discharge lamp lighting device controls the start (or stop) of the supply of the pulse to the downconverter 1.08 by the command S2 from the CPU 1.13.
- a rectangular wave having a predetermined duty ratio can be obtained by a comparator that generates a logical output by comparing a triangular wave generated by an internal oscillator with a predetermined DC level.
- the lighting command S3 to the inverter 102 instructs the start of the discharge lamp lighting operation described above.
- the user in a so-called standby state in which the projector device is in a non-operating state and the minimum functions necessary for starting operation by the standby power supply are in an active state, the user operates the power switch 1.12.
- an ON command S0 is given to the CPU 113.
- the CPU 113 first outputs a command S1 to turn on the DC power supply.
- Power supply from the power supply 109 to the down-converter 108 starts.
- the CPU 11.3 measures the time from receiving the ON command SO with a timer, and turns on the output of the PWM controller 107 when a predetermined time elapses, for example, 2 to 3 seconds.
- a command S2 is output, and a rectangular wave is supplied to the downconverter 108 to start its function.
- the CPU 113 outputs the lighting command S3 to the igniter 102 and starts the lighting operation of the lamp 101. Then, in the projector device, the lighting operation as described in the above embodiment is started.
- the power supply from the DC power supply 109 is started, and after a predetermined time of, for example, 2 to 3 seconds has elapsed and the output has been stabilized, the PWM converter for operating the down converter 108 is started. Since the rectangular wave is supplied from the controller 107, the downconverter 108 can be reliably operated. Further, after the downconverter 108 starts operating and power is supplied to the lamp 101, the power supply is started because the inverter 102 performs the lighting operation of the lamp 101. Being up The lighting device can be operated while reliably preventing the influence of the transient unstable state of the beam.
- the current supplied to the lamp 101 after the identification is continuously reduced.
- the time during which a large current, which is larger than the steady-state current, flows through the discharge lamp can be significantly reduced, and the heat source applied to the electrodes can be reduced. Since the thermal fatigue of the electrode can be reduced, the consumption of the electrode can be reduced. Therefore, in this projector device, it is possible to prevent the life from being shortened due to the exhaustion of the electrodes of the lamp 101, and to realize the current control means of the discharge lamp lighting device with a simple configuration. It can be manufactured with excellent reliability and at low cost.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02736038A EP1404161B1 (en) | 2001-06-08 | 2002-06-10 | Discharge lamp igniter device and projector device |
US10/333,834 US6750620B2 (en) | 2001-06-08 | 2002-06-10 | Discharge lamp igniter device and projector device |
JP2003504718A JP4239818B2 (ja) | 2001-06-08 | 2002-06-10 | 放電灯点灯装置及びプロジェクタ装置 |
DE60217342T DE60217342T2 (de) | 2001-06-08 | 2002-06-10 | Zündeinrichtung für eine entladungslampe und projektoreinrichtung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-174720 | 2001-06-08 | ||
JP2001174720 | 2001-06-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002102120A1 true WO2002102120A1 (fr) | 2002-12-19 |
Family
ID=19015964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005746 WO2002102120A1 (fr) | 2001-06-08 | 2002-06-10 | Dispositif d'amorçage d'une lampe a decharge et dispositif projecteur |
Country Status (6)
Country | Link |
---|---|
US (1) | US6750620B2 (ja) |
EP (1) | EP1404161B1 (ja) |
JP (1) | JP4239818B2 (ja) |
CN (1) | CN1301042C (ja) |
DE (1) | DE60217342T2 (ja) |
WO (1) | WO2002102120A1 (ja) |
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- 2002-06-10 US US10/333,834 patent/US6750620B2/en not_active Expired - Fee Related
- 2002-06-10 JP JP2003504718A patent/JP4239818B2/ja not_active Expired - Fee Related
- 2002-06-10 DE DE60217342T patent/DE60217342T2/de not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
DE60217342T2 (de) | 2007-08-16 |
US20030160576A1 (en) | 2003-08-28 |
DE60217342D1 (de) | 2007-02-15 |
EP1404161A4 (en) | 2004-07-14 |
JPWO2002102120A1 (ja) | 2004-09-30 |
CN1465210A (zh) | 2003-12-31 |
US6750620B2 (en) | 2004-06-15 |
EP1404161A1 (en) | 2004-03-31 |
CN1301042C (zh) | 2007-02-14 |
EP1404161B1 (en) | 2007-01-03 |
JP4239818B2 (ja) | 2009-03-18 |
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