EP1773104A1 - Dispositif d'allumage de lampe a decharge et appareil d'éclairage - Google Patents

Dispositif d'allumage de lampe a decharge et appareil d'éclairage Download PDF

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Publication number
EP1773104A1
EP1773104A1 EP06255050A EP06255050A EP1773104A1 EP 1773104 A1 EP1773104 A1 EP 1773104A1 EP 06255050 A EP06255050 A EP 06255050A EP 06255050 A EP06255050 A EP 06255050A EP 1773104 A1 EP1773104 A1 EP 1773104A1
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EP
European Patent Office
Prior art keywords
lamp
voltage
dimming
discharge lamp
lighting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06255050A
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German (de)
English (en)
Inventor
Hiroshi c/o Toshiba Lighting & Tech Co. Terasaka
Tomokazu c/o Toshiba Lighting & Tech Co. Usami
Hideo c/o Toshiba Lighting & Tech Co. Kozuka
Kazuyuki c/o Toshiba Lighting & Tech Co. Uratani
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Toshiba Lighting and Technology Corp
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Toshiba Lighting and Technology Corp
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Publication date
Application filed by Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Publication of EP1773104A1 publication Critical patent/EP1773104A1/fr
Withdrawn legal-status Critical Current

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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
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase
    • 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
    • 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
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations

Definitions

  • This invention relates to a discharge lamp lighting device and illumination apparatus which perform a dimming lighting operation by using control means such as a microcomputer or the like.
  • a lighting device including a chopper circuit which adjusts power supplied to a discharge lamp, a chopper current detecting circuit, a lamp voltage detecting circuit, a control circuit which is supplied with detection outputs of both of the detecting circuits and controls the switching element of the chopper circuit to control power of the discharge lamp and a microcomputer which determines a control value used when the control circuit controls the power is disclosed. Further, in the above Publication, the technique for determining a power control amount based on a linear expression corresponding to a lamp voltage value by use of the microcomputer is also disclosed.
  • This invention is to provide a discharge lamp lighting device and illumination apparatus which can adequately perform the lamp power control operation at the full-lighting time and even at the dimming time, derive target lamp power in a short period of time at the dimming time and rapidly perform the lamp power control operation.
  • a discharge lamp lighting device including a control circuit which controls a power control operation of a discharge lamp by controlling an output of a chopper circuit according to a dimming signal and lamp voltage
  • the control circuit includes means for setting a reference voltage value according to lamp voltage detected by a lamp voltage detecting circuit and a full-lighting signal or dimming signal from a dimming signal inputting section, a first detecting section which is connected in parallel with the discharge lamp to detect voltage corresponding to the lamp voltage, a second detecting section which is connected in series with the discharge lamp to detect voltage corresponding to a lamp current, outputting means for detecting voltage corresponding to the sum of voltages detected by both of the detecting sections, and output control means for controlling an output of the chopper circuit to set the sum voltage value output from the outputting means equal to the reference voltage value and the discharge lamp is set to have a stable lighting region in which rated lamp powers at the full-lighting time and at the dimming time are ensured in a lamp
  • the dimming signal is, for example, a PWM (Pulse Width Modulation) signal. It is input to the discharge lamp lighting device from, for example, a switch provided outside the discharge lamp lighting device.
  • the chopper circuit may include a voltage step-up chopper, voltage step-down chopper and a combination thereof.
  • the chopper circuit has at least one switching element and controls power output by ON/OFF-controlling the switching element. Detection of lamp voltage is to divide voltage generated across the discharge lamp and detect the divided voltage and to detect output voltage from the chopper circuit as voltage approximately equal to lamp voltage.
  • control circuit includes a microcomputer or the like.
  • the microcomputer or the like includes a microcomputer, microprocessor, CPU, DSP, arithmetic operation device and other similar devices.
  • means such as a polarity inverting circuit, inverter circuit and the like may be connected or may not be connected between the chopper circuit and the discharge lamp.
  • the means for setting the reference voltage value of the control circuit sets a reference voltage value by providing a table in which values "a” corresponding to lamp voltages which correspond to dimming light amounts and values "b” corresponding to lamp currents which correspond to the dimming light amounts are set and using lamp voltage detected by the lamp voltage detecting circuit and the corresponding values "a” and "b” of the table based on an input dimming signal.
  • control circuit includes switching means for setting an output mode to a rated output mode in which the starting operation is performed in a rated starting condition at the dimming start time and switching the output mode from the rated output mode to a dimming output mode in which the starting operation is performed in a dimming start condition while the power characteristic corresponding to the dimming light amount of the dimming signal is maintained when the lamp voltage of the discharge lamp has reached preset voltage.
  • an illumination apparatus which includes a discharge lamp, a discharge lamp lighting device described in one of claims 1 to 3, and an illumination apparatus main body having the discharge lamp and discharge lamp lighting device mounted thereon.
  • the lamp power control operation can be adequately performed at the full-lighting time and even at the dimming time. Further, target lamp power can be derived in a short period of time at the dimming time and the rapid lamp power control operation can be performed. Further, in this invention, the reference voltage value can be easily set. Also, in this invention, a possibility that the lamp will be extinguished can be suppressed without delaying the rise operation.
  • a DC power supply is formed by connecting an input terminal of a full-wave rectifier circuit 2 to an AC power supply 1 and connecting a smoothing capacitor 3 to an output terminal of the full-wave rectifier circuit 2.
  • a voltage step-down chopper circuit 4 used as a chopper circuit is connected to the DC power supply.
  • the voltage step-down chopper circuit 4 includes a switching element 5, inductor 6 and diode 7.
  • the switching element 5 is connected at one end to the positive terminal of the DC power supply and connected at the other end to one end of the inductor 6 and the cathode terminal of the diode 7.
  • the anode terminal of the diode 7 is connected to the negative terminal of the DC power supply.
  • the positive output terminal of the voltage step-down chopper circuit 4 is used as the other end of the inductor 6 and the negative output terminal thereof is used as the anode of the diode 7.
  • One electrode of a discharge lamp 8 is connected to the other end of the inductor 6 and the other electrode thereof is connected to the anode terminal of the diode 7 via a resistor 9 used as a second detecting section.
  • a series circuit of resistors 10 and 11 which configure a first detecting circuit and a capacitor 12 are connected in parallel between the electrodes of the discharge lamp 8.
  • a lamp current I L flows through the resistor 9 to generate voltage r ⁇ I L across the resistor 9.
  • r indicates the resistance of the resistor 9.
  • the lamp voltage V L is generated across the series circuit of the resistors 10 and 11.
  • the lamp voltage V L is divided by, for example, 1/N by use of the resistors 10 and 11. That is, voltage generated across the resistor 11 is set to V L /N.
  • a voltage value V S1 of the voltage generated at the connection node of the resistors 10 and 11 is set to (V L /N + r ⁇ I L ) obtained by superimposing the lamp voltage V L /N divided by the resistors 10 and 11 on the voltage r ⁇ I L generated by the lamp current I L flowing through the resistor 9.
  • the voltage value V S1 contains factors of the lamp voltage and lamp current and can be set to correspond to lamp power W L supplied to the discharge lamp 8.
  • a lamp voltage detecting circuit configured by a series circuit of resistors 13 and 14 is connected in parallel with the discharge lamp 8.
  • the detected value V L of voltage obtained by dividing the lamp voltage is output from a connection node of the series circuit of the resistors 13 and 14.
  • the lamp voltage detecting circuit may be configured by using the resistors 10, 11 instead of the resistors 13, 14.
  • the voltage sep-down chopper circuit 4 switches the switching element 5 according to a signal from a controller 15.
  • the voltage value V S1 generated at the connection node of the resistors 10 and 11 is input to an operational amplifier 21 of the controller 15 via an output line 30 used as output means.
  • a dimming signal input section 16 is supplied with a remote control signal of full lighting from the exterior to output a full-lighting signal and is supplied with a remote control signal of dimming light to output a dimming signal.
  • the full-lighting signal and dimming signal output from the dimming signal input section 16 are PWM (pulse width modulation) signals, converted into DC voltage by a filter 17 and then input to a dimming input terminal of a microcomputer 18.
  • the detected value V L of voltage obtained by dividing the lamp voltage output from the lamp voltage detecting circuit (resistors 13 and 14) is input to the V L input terminal of the microcomputer 18.
  • the dimming input terminal and V L input terminal each have an A/D converter to convert the input voltage value into a digital value and supply the same.
  • the microcomputer 18 has a table 19.
  • the characteristic of a load power curve of lamp power W L (F) with respect to lamp voltage V L (F) at the full-lighting time indicated by a graph g1 in FIG. 2 is set as data.
  • the load power curve g1 has a stable lighting region (flat region of the graph g1) which ensures that the rated lamp power W L is set at 100W in a range before and after the lamp voltage of 100V, that is, in a range of the lamp voltage V L of approximately 90V to 110V.
  • values "a” and “b” which respectively correspond to the lamp voltage and lamp current and vary according to a dimming light amount of a dimming signal are set.
  • the values "a” and “b” can be attained based on actual measurements when the discharge lamp 8 is lighted in a dimming mode.
  • the controller 15 and microcomputer 18 configure a control circuit.
  • the controller 15 compares the voltage value V S1 with a reference voltage value V S2 output from the microcomputer 18 in the operational amplifier 21 and controls the switching duty of the switching element 5 of the voltage step-down chopper circuit 4 to set the compared voltage values equal to each other.
  • the voltage step-down chopper circuit 4 performs the power control operation for the discharge lamp 8.
  • the microcomputer 18 When an input signal to the dimming signal input section 16 is a full-lighting signal and if the microcomputer 18 is supplied with a detected value V L (F) of the lamp voltage from the lamp voltage detecting circuit (resistors 13, 14), the microcomputer 18 reads out lamp power W L (F) corresponding to the lamp voltage V L (F) from the table 19. Then, it outputs an output corresponding to the lamp power W L (F) from the output terminal thereof.
  • the output corresponding to the lamp power W L (F) output from the output terminal of the microcomputer 18 is supplied to the operational amplifier 21 of the controller 15 via the filter circuit 20 as the reference voltage value V S2 .
  • the dimming light amount of 50% indicates that power is adjusted to set the light output to 50% of the light output at the full-lighting time.
  • a graph g2 of FIG. 2 shows the characteristic of a load power curve of the lamp power W L (d) with respect to lamp voltage V L (d) when the dimming light amount of the discharge lamp 8 is set to 50%.
  • the dimming light amount is 50%
  • light flux from the discharge lamp 8 becomes 50% of the light flux at the full-lighting time.
  • the lamp power W L (d) of the discharge lamp 8 is set to 60W.
  • the range of the lamp voltage V L (d) in the stable lighting region (flat region of the graph g2) in which the lamp power of the discharge lamp 8 is maintained at 60W varies in a range higher and lower than 88V, that is, in a range of approximately 80V and 96V.
  • the lamp voltage of the discharge lamp 8 varies with a variation in the lamp power according to the dimming light amount and, as a result, the stable lighting region and lamp current also vary.
  • the microcomputer 18 When a dimming signal is input in a state where the full-lighting signal is input, the microcomputer 18 reads out values "a" and "b" corresponding to the dimming light amount of the dimming signal from the table 19 and lights the discharge lamp 8 in the dimming mode.
  • the microcomputer 18 derives lamp power W L (d) at the dimming time based on the lamp voltage V L (F) obtained at this time, lamp power W L (F) at the full-lighting time read out from the table 19 and the values "a" and "b" read out from the table 19.
  • the lamp current at the full-lighting time is derived by calculating the expression of (lamp power W L (F) at full-lighting time - (lamp voltage V L (d) at dimming time)/(value "b")). Then, the lamp voltage V L (F) at the full-lighting time is also calculated.
  • the lamp power W L (d) at the dimming time is obtained by calculating the expression of (value "a” ⁇ lamp voltage V L (F) at full-lighting time + value "b” ⁇ lamp current at full-lighting time).
  • the lamp power W L (d) corresponding to the dimming light amount can be derived by calculation to set the relation between the lamp voltage V L and the lamp power W L (d) at the dimming time to the characteristic of a load power curve approximately similar to the load power curve g1 at the full-lighting time.
  • the microcomputer 18 may derive the lamp power W L (d) of the discharge lamp 8 to jump from the load power curve g1 to the load power curve g2 when the lamp voltage V L has exceeded a preset value. Then, an output corresponding to the thus derived lamp power W L (d) is supplied from the output terminal of the microcomputer 18 to the operational amplifier 21 of the controller 15 via the filter circuit 20 as the reference voltage value V S2 .
  • the microcomputer 18 when a dimming light amount is changed while a dimming signal with a certain dimming light amount is being input, the microcomputer 18 temporarily derives a lamp voltage value V L (F) at the full-lighting time by use of a detected value V L (d1) of the lamp voltage which is so far supplied thereto from the lamp voltage detecting circuit (resistors R13, R14) and values "a1" and "b1" based on the dimming light amount obtained up to now. Then, it reads out corresponding lamp power W L (F) at the full-lighting time from the table 19 by use of the lamp voltage value V L (F) at the full-lighting time.
  • the microcomputer 18 reads out values "a2" and "b2" corresponding to a new changed dimming light amount from the table 19 and derives lamp power W L (d) corresponding to the new dimming light amount based on the readout values "a2" and "b2".
  • the lamp power W L (d) corresponding to the dimming light amount is derived by calculation to set the relation between the lamp voltage V L and the lamp power W L (d) at the dimming time to the characteristic of a load power curve which is approximately similar to the load power curve g1 at the full-lighting time. Then, an output corresponding to the thus derived lamp power W L (d) is supplied from the output terminal of the microcomputer 18 to the operational amplifier 21 of the controller 15 via the filter circuit 20 as the reference voltage value V S2 .
  • a table 19a in which values "a" and "b" corresponding to the dimming light amount are set as shown in FIG. 3 is used as part of the table 19.
  • the maximum dimming light amount is set to 50% and the control operation for the dimming light amount exceeding 50% is not performed. Therefore, data set in the table 19a is set in a range of the dimming light amount of 0% to 50%.
  • the microcomputer 18 reads out lamp power W L (F) corresponding to the lamp voltage V L (F) from the table 19 while a full-lighting signal is being input from the dimming signal input section 16 to the microcomputer 18 via the filter 17. Then, it supplies an output corresponding to the lamp power W L (F) from the output terminal thereof to the operational amplifier 21 of the controller 15 via the filter circuit 20 as the reference voltage value V S2 .
  • the voltage value V S1 of (V L /N + r ⁇ I L ) obtained by superimposing the voltage V L /N on the voltage r ⁇ I L generated by the lamp current I L flowing through the resistor 9 is input from the connection node of the resistors 10 and 11 to the operational amplifier 21 of the controller 15.
  • the controller 15 compares the voltage value V S1 with the reference voltage value V S2 in the operational amplifier 21 and controls the switching duty of the switching element 5 of the voltage step-down chopper circuit 4 to set the voltage value V S1 equal to the reference voltage value V S2 .
  • the microcomputer 18 reads out lamp power W L (F) corresponding to the lamp voltage V L (F) from the table 19 and reads out values "a" and "b” corresponding to the dimming light amount of the dimming signal from the table 19a. Then, it derives lamp power W L (d) according to a load power curve similar to the load power curve g1 at the full-lighting time by using the lamp voltage V L (F), lamp power W L (F) and values "a" and "b".
  • the microcomputer 18 supplies an output corresponding to the thus derived lamp power W L (d) from the output terminal thereof to the operational amplifier 21 of the controller 15 via the filter circuit 20 as the reference voltage value V S2 .
  • the voltage value V S1 of (V L /N + r ⁇ I L ) obtained by superimposing the lamp voltage V L /N on the voltage r ⁇ I L generated by the lamp current I L flowing through the resistor 9 is input from the connection node of the resistors 10 and 11 to the operational amplifier 21 of the controller 15.
  • the controller 15 compares the voltage value V S1 with the reference voltage value V S2 in the operational amplifier 21 and controls the switching duty of the switching element 5 of the voltage step-down chopper circuit 4 to set the voltage value V S1 equal to the reference voltage value V S2 .
  • power supplied from the voltage step-down chopper circuit 4 to the discharge lamp 8 is controlled and set to power in the stable lighting region which corresponds to the dimming light amount of the dimming signal.
  • the dimming signal has a dimming light amount of 50%
  • the lighting state of the discharge lamp 8 is controlled so that the discharge lamp will be lighted with the lamp power W L (d) set at approximately equal to 60W in a range of the lamp voltage V L (d) of approximately 80V to 96V according to the load power curve g2 similar to the load power curve g1.
  • the brightness of the discharge lamp 8 at this time becomes 50% of the brightness at the full-lighting time.
  • power supplied to the discharge lamp 8 can be, of course, controlled according to power in the stable lighting region at the full-lighting time and can also be controlled according to power in the stable lighting region corresponding to a dimming light amount by adequately controlling the lamp voltage V L at the dimming time.
  • the lighting device of the present embodiment can adequately perform the lamp power control operation according to a dimming signal.
  • the start lighting control operation of the discharge lamp 8 at the dimming time is performed by using the rated values like the start lighting control operation at the full-lighting time. That is, the controller 15 has switching means 22 for changing the output mode of the discharge lamp 8 in a period from the starting time thereof to the lighting start time from a rated output mode to a dimming output mode.
  • the switching means 22 sets the output mode into a rated output mode in which the discharge lamp 8 is started in a rated starting condition at the dimming start time to control the switching duty of the switching element 5 of the voltage step-down chopper circuit 4.
  • the rated starting condition is a condition that the discharge lamp 8 is started to start the lighting operation with the rated value.
  • the switching means 22 switches the output mode from the rated output mode to a dimming output mode in which it starts in the dimming start condition while the power characteristic of the dimming ratio corresponding to the dimming signal is maintained.
  • the dimming start condition is a condition in which the discharge lamp 8 is started according to a dimming light amount and controlled to start the lighting operation.
  • the controller 15 controls the voltage step-down chopper circuit 4 to start the discharge lamp 8 with the rated voltage and perform the lighting operation at the full-lighting time.
  • the lamp voltage V L satisfactorily rises.
  • the lamp voltage V L (F) shown in FIG. 4A indicates rated lamp voltage.
  • the controller 15 controls the voltage step-down chopper circuit 4 by use of the switching means 22 at the dimming lighting time.
  • the switching means 22 first sets the output mode to the rated output mode in which the discharge lamp is started in the rated starting condition to start the lighting operation of the discharge lamp 8. Then, when the lamp voltage V L has reached preset voltage V L1 , it switches the output mode from the rated output mode to the dimming output mode in which the discharge lamp is started in the dimming start condition while the power characteristic according to the dimming light amount of the dimming signal is maintained.
  • the discharge lamp 8 is first controlled to be lighted with the rated voltage like the case of the full-lighting operation. Then, when the lamp voltage V L has reached preset voltage V L1 , the dimming lighting operation is controlled according to the load power curve corresponding to the dimming light amount of the dimming signal from the dimming signal input section 16.
  • the lighting operation of the discharge lamp 8 is controlled with lamp voltage V L2 corresponding to the dimming light amount.
  • the lighting device of the present embodiment can perform the control operation without delaying the rise time of the lamp voltage at the dimming lighting time. Therefore, there occurs no possibility that the discharge lamp is extinguished due to delay in the rise time of the lamp voltage.
  • the lighting device of the present embodiment switches the output mode from the rated output mode to the dimming output mode with the preset voltage V L1 lower than the lamp voltage V L2 at the dimming time, there is no possibility that excessively high lamp power is applied to the discharge lamp 8 at the rise time of the lamp voltage.
  • the discharge lamp 8 can suppress damage given to the electrode to the lowest limit and suppress a variation in the brightness at the switching time from the rated output mode to the dimming output mode to the minimum.
  • the controller 15 switches the control operation of the voltage step-down chopper circuit 4 from the dimming lighting control operation to the full lighting control operation when the discharge lamp 8 is extinguished in a state where the discharge lamp 8 is lighted in the dimming mode.
  • the lighting device of the present embodiment can improve the condition of starting faults due to insufficient open voltage generated at the extinguishing time and suppress damage to the lamp electrode.
  • the values "a" and "b" corresponding to the dimming light amount are previously set in the table 19 is explained, but this is not limitative.
  • the values can be derived by calculation based on the dimming light amount of a dimming signal.
  • a discharge lamp lighting device of the present embodiment directly inputs a dimming signal of a PWM (pulse width modulation) signal from a dimming signal input section 16 to the dimming light input terminal of a microcomputer 181 without using the filter 17.
  • PWM pulse width modulation
  • the microcomputer 181 converts an input dimming signal to DC voltage in the internal portion.
  • the other functions of the microcomputer 181 are the same as those of the microcomputer 18 of the first embodiment.
  • the microcomputer 181 supplies a reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (F) which is power in the stable lighting region of a load power curve g1 at the input time of a full-lighting signal from the output terminal thereof to a controller 15 via a filter circuit 20.
  • the microcomputer 181 supplies a reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (d) which is power in the stable lighting region of a load power curve which is similar to the load power curve g1 and derived according to values "a" and "b” corresponding to a dimming light amount at the input time of a dimming signal from the output terminal thereof to the controller 15 via the filter circuit 20.
  • the controller 15 controls a voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (F) in the stable lighting region of the load power curve g1 at the full-lighting time. Further, at the dimming time, it controls the voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (d) in the stable lighting region of the load power curve which is similar to the load power curve g1 and derived according to the dimming light amount.
  • a discharge lamp lighting device of the present embodiment adds a voltage value V S1 of (V L /N + r ⁇ I L ) obtained by superimposing lamp voltage V L /N on voltage r ⁇ I L generated by a lamp current I L flowing through a resistor 9 and output from a connection node of resistors 10 and 11 with a reference voltage value V S2 output from a microcomputer 18 via a filter circuit 20 and supplies the thus added voltage to a controller 151.
  • the controller 151 controls the switching duty of a switching element 5 of a voltage step-down chopper circuit 4 to set the added voltage of the voltage value V S1 and reference voltage value V S2 to preset constant voltage.
  • the constant voltage set in the controller 151 is different at the full-lighting time and at the dimming time and varies according to the dimming degree at the dimming time.
  • the other functions of the controller 15 are the same as those of the controller 15 explained in the first embodiment.
  • the microcomputer 18 supplies the reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (F) which is power in the stable lighting region of the load power curve g1 at the input time of a full-lighting signal from the output terminal thereof.
  • the microcomputer 18 supplies the reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (d) which is power in the stable lighting region of a load power curve which is similar to the load power curve g1 and derived according to values "a" and "b” corresponding to a dimming light amount at the input time of a dimming signal from the output terminal thereof.
  • the reference voltage value V S2 output from the output terminal of the microcomputer 18 is output via the filter circuit 20 and added with the voltage value V S1 supplied from the connection node of the resistors 10 and 11. Then, the added voltage is supplied to the controller 151.
  • the controller 151 controls the switching duty of the switching element 5 of a voltage step-down chopper circuit 4 to set the added voltage of the voltage value V S1 and reference voltage value V S2 to preset constant voltage.
  • the controller 151 controls the voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (F) in the stable lighting region of the load power curve g1 at the full-lighting time. Further, at the dimming time, it controls the voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (d) in the stable lighting region of the load power curve which is similar to the load power curve g1 and derived according to the dimming light amount.
  • a discharge lamp lighting device of the present embodiment directly inputs a dimming signal of a PWM (pulse width modulation) signal from a dimming signal input section 16 to the dimming light input terminal of a microcomputer 181 without using the filter 17.
  • PWM pulse width modulation
  • the microcomputer 181 converts an input dimming signal to DC voltage in the internal portion.
  • the discharge lamp lighting device of the present embodiment adds a voltage value V S1 of (V L /N + r ⁇ I L ) obtained by superimposing lamp voltage V L /N on voltage r ⁇ I L generated by a lamp current I L flowing through a resistor 9 and output from a connection node of resistors 10 and 11 with a reference voltage value V S2 output from the microcomputer 181 via a filter circuit 20 and supplies the thus added voltage to a controller 151.
  • the controller 151 controls the switching duty of a switching element 5 of a voltage step-down chopper circuit 4 to set the added voltage of the voltage value V S1 and reference voltage value V S2 to preset constant voltage.
  • the microcomputer 181 supplies the reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (F) which is power in the stable lighting region of a load power curve g1 at the input time of a full-lighting signal from the output terminal thereof.
  • the microcomputer 181 supplies the reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (d) which is power in the stable lighting region of a load power curve which is similar to the load power curve g1 and derived according to values "a" and "b” corresponding to a dimming light amount at the input time of a dimming signal from the output terminal thereof.
  • the reference voltage value V S2 output from the output terminal of the microcomputer 181 is output via the filter circuit 20 and added with the voltage value V S1 from the connection node of the resistors 10 and 11. Then, the added voltage is supplied to the controller 151.
  • the controller 151 controls the switching duty of the switching element 5 of the voltage step-down chopper circuit 4 to set the added voltage of the voltage value V S1 and reference voltage value V S2 to preset constant voltage.
  • the controller 151 controls the voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (F) in the stable lighting region of the load power curve g1 at the full-lighting time. Further, at the dimming time, it controls the voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (d) in the stable lighting region of the load power curve which is similar to the load power curve g1 and derived according to the dimming light amount.
  • the discharge lamp lighting device of the present embodiment includes a diode 7 having a cathode terminal connected to one end of an inductor 6 and an anode terminal connected to one end of a resistor 9.
  • a series circuit of resistors 10, 11 and a capacitor 12 are connected between the other end of the inductor 6 and the other end of the resistor 9.
  • the discharge lamp lighting device of the present embodiment has a polarity inverting circuit 23 connected to the series circuit of the resistors 10, 11.
  • the polarity inverting circuit 23 includes a series circuit of a pair of switching elements 24, 25 which are each configured by an FET (field effect transistor) and a series circuit of a pair of switching elements 26, 27 which are each configured by an FET and the above two series circuits are connected in parallel with each other.
  • the polarity inverting circuit 23 has a series circuit of an igniter 28 which generates a high-voltage pulse at the starting time and the discharge lamp 8 connected between a connection node of the pair of switching elements 24, 25 and a connection node of the pair of switching elements 26, 27.
  • a voltage value V S1 generated from the connection node of the resistors 10, 11 is supplied to an operational amplifier 21 of a controller 15 via an output line 30 and a V L input terminal of a microcomputer 18.
  • the microcomputer 18 derives a detected value V L of lamp voltage from the voltage value V S1 input to the V L input terminal and performs the same process as described in the former embodiments by using the detected value V L .
  • the switching elements 24, 25, 26, 27 of the polarity inverting circuit 23 are switching-driven by a drive circuit 29.
  • the polarity inverting circuit 23 sets the switching elements 24, 27 in the ON state in a half cycle by use of the drive circuit 29 and sets the switching elements 25, 26 in the OFF state to pass a lamp current through the discharge lamp 8 in a direction indicated by an arrow A of solid lines in FIG. 8.
  • it sets the switching elements 25, 26 in the ON state by use of the drive circuit 29 and sets the switching elements 24, 27 in the OFF state to pass a lamp current through the discharge lamp 8 in a direction indicated by an arrow B of dotted lines in FIG. 8.
  • the lighting device of the present embodiment AC-lights the discharge lamp 8.
  • the microcomputer 18 supplies a reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (F) which is power in the stable lighting region of a load power curve g1 from the output terminal thereof to the controller via a filter circuit 20 at the input time of a full-lighting signal.
  • the microcomputer 18 supplies a reference voltage value V S2 used to control the lighting operation of the discharge lamp 8 with lamp power W L (d) which is power in the stable lighting region of a load power curve which is similar to the load power curve g1 and derived by using values "a" and "b” corresponding to a dimming light amount from the output terminal thereof to the controller 15 via the filter circuit 20.
  • the controller 15 controls a voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (F) in the stable lighting region of the load power curve g1 at the full-lighting time. Further, at the dimming time, it controls the voltage step-down chopper circuit 4 to light the discharge lamp 8 with the lamp power W L (d) in the stable lighting region of the load power curve which is similar to the load power curve g1 and derived according to the dimming light amount.
  • the illumination apparatus has a discharge lamp lighting device 100 and illumination apparatus main body 101 which are separately arranged.
  • the illumination apparatus main body 101 includes a concave-shaped shade portion 101a having an inner surface formed of a reflection surface and a discharge lamp 102 is loaded on the central portion of the shade portion 101a.
  • the discharge lamp lighting device 100 has the same configuration as that of one of the discharge lamp lighting devices described in the first to fourth embodiments.
  • the discharge lamp lighting device 100 used in the above illumination apparatus lights the discharge lamp 102 with lamp power W L (F) in the stable lighting region of a load power curve g1 at the full-lighting time. Further, at the dimming time, it lights the discharge lamp 102 with lamp power W L (d) in the stable lighting region of a load power curve which is similar to the load power curve g1 and derived according to the dimming light amount.
  • power supplied to the discharge lamp 102 is controlled by use of power in the stable lighting region at the full-lighting time and is also controlled by use of power in the stable lighting region corresponding to the dimming light amount by adequately controlling lamp voltage V L at the dimming time.
  • target lamp power can be derived by use of values "a" and "b" corresponding to the dimming light amount read out from a table in a short period of time and, as a result, the lamp power control operation can be rapidly performed.

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  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
EP06255050A 2005-09-29 2006-09-29 Dispositif d'allumage de lampe a decharge et appareil d'éclairage Withdrawn EP1773104A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2005283745 2005-09-29
JP2005338754 2005-11-24
JP2006224985A JP4923852B2 (ja) 2005-09-29 2006-08-22 放電ランプ点灯装置および照明装置

Publications (1)

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EP1773104A1 true EP1773104A1 (fr) 2007-04-11

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Application Number Title Priority Date Filing Date
EP06255050A Withdrawn EP1773104A1 (fr) 2005-09-29 2006-09-29 Dispositif d'allumage de lampe a decharge et appareil d'éclairage

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EP (1) EP1773104A1 (fr)
JP (1) JP4923852B2 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240009A (en) * 1978-02-27 1980-12-16 Paul Jon D Electronic ballast
US4412154A (en) * 1981-05-20 1983-10-25 Compagnie De Signaux Et D'entreprises Electriques Start up frequency adjustment in an electronic power device for a discharge lamp
EP0445882A2 (fr) * 1990-03-08 1991-09-11 Koninklijke Philips Electronics N.V. Dispositif de commutation
US5103143A (en) * 1990-05-14 1992-04-07 Hella Kg Hueck & Co. Process and apparatus for starting a high pressure gas discharge lamp for vehicles
US5198728A (en) * 1991-01-24 1993-03-30 Patent-Treuhand Gesellschaft Fur Fur Elektrische Gluhlampen Mbh Operating circuit for a discharge lamp
US5212428A (en) * 1990-10-01 1993-05-18 Koito Manufacturing Co., Ltd. Lighting circuit for vehicular discharge lamp
US20030122505A1 (en) * 2002-01-02 2003-07-03 Ptent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh Operating appliance and an operating method for high-pressure lamps
EP1365634A2 (fr) * 2002-05-15 2003-11-26 Ushiodenki Kabushiki Kaisha Dispositif à source lumineuse

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07320888A (ja) * 1994-05-26 1995-12-08 Tec Corp 放電灯点灯装置
JPH08273871A (ja) * 1995-03-31 1996-10-18 Toshiba Lighting & Technol Corp 電源装置及び高圧放電灯点灯装置並びに照明装置
JPH11233282A (ja) * 1998-02-13 1999-08-27 Toshiba Lighting & Technology Corp 放電灯点灯装置、照明装置及びプロジェクタ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4240009A (en) * 1978-02-27 1980-12-16 Paul Jon D Electronic ballast
US4412154A (en) * 1981-05-20 1983-10-25 Compagnie De Signaux Et D'entreprises Electriques Start up frequency adjustment in an electronic power device for a discharge lamp
EP0445882A2 (fr) * 1990-03-08 1991-09-11 Koninklijke Philips Electronics N.V. Dispositif de commutation
US5103143A (en) * 1990-05-14 1992-04-07 Hella Kg Hueck & Co. Process and apparatus for starting a high pressure gas discharge lamp for vehicles
US5212428A (en) * 1990-10-01 1993-05-18 Koito Manufacturing Co., Ltd. Lighting circuit for vehicular discharge lamp
US5198728A (en) * 1991-01-24 1993-03-30 Patent-Treuhand Gesellschaft Fur Fur Elektrische Gluhlampen Mbh Operating circuit for a discharge lamp
US20030122505A1 (en) * 2002-01-02 2003-07-03 Ptent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh Operating appliance and an operating method for high-pressure lamps
EP1365634A2 (fr) * 2002-05-15 2003-11-26 Ushiodenki Kabushiki Kaisha Dispositif à source lumineuse

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JP2007173204A (ja) 2007-07-05

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