WO2007086455A1

WO2007086455A1 - Discharge lamp operating device and illuminator

Info

Publication number: WO2007086455A1
Application number: PCT/JP2007/051154
Authority: WO
Inventors: Go Kato; Kazutoshi Mita; Yuji Takahashi; Masahiko Kamata; Yuuichiro Takahara; Yanbin Sun
Original assignee: Toshiba Lighting & Technology Corporation
Priority date: 2006-01-25
Filing date: 2007-01-25
Publication date: 2007-08-02
Also published as: JP4985408B2; JPWO2007086455A1; CN101356861A; CN101356861B

Abstract

Current detecting means (6) detects the lamp current value of a discharge lamp (3). Control means (8) determines the filament heating rate corresponding to the then lamp current value from the stored data or by computation . Detecting means (5) detects the filament heating rate and judges whether or not the detected filament heating rate agrees with the stored filament heating rate by comparison between them. If the detected filament heating rate is out of the area shaded with diagonal lines shown in Fig. 3, the on-duty of a switch (7) is controlled so that the detected filament heating rate is within the area. That is, if the filament heating rate is insufficient, the on-duty is increased; if the filament heating rate is judged as excessive, it is decreased.

Description

Discharge lamp lighting device and lighting device

Technical field

TECHNICAL FIELD [0001] The present invention relates to a discharge lamp lighting device that controls the amount of heating of a filament when a hot cathode discharge lamp is dimmed and lit, and an illumination device using the discharge lamp lighting device.

Background art

[0002] When dimming a hot cathode discharge lamp, it is known that changing the heating amount of the filament in accordance with the dimming degree is preferable from the viewpoint of the life of the discharge lamp or power saving. . As an example of a response to such a request, one described in Japanese Patent Laid-Open No. 2005-235619 has been proposed.

[0003] The technology described in Japanese Patent Application Laid-Open No. 2005-235619 provides switch means for turning on and off a preheating transformer provided at the output end of an inverter circuit, and controls the on-duty of the switch means in accordance with the dimming degree. Is.

However, in the device described in Japanese Patent Laid-Open No. 2005-235619, only the switch means is turned on / off with an on-duty fixed in advance according to the dimming degree. In some cases, the heating amount of the filament cannot be optimized in accordance with the actual lamp current. In other words, the actual heating amount of the filament cannot be confirmed, and the heating amount of the filament may not be optimized. For example, the filaments of each discharge lamp have deviations that are not all the same quality, but the filament heating amount may be inappropriate for filaments with large deviations.

[0005] Furthermore, it is conceivable that the filament heating cannot be optimized by the uniform on-duty control set in advance even due to factors such as manufacturing deviation of the preheating transformer, power supply voltage fluctuation, and ambient temperature fluctuation.

[0006] Therefore, the present invention provides a discharge that can optimize the heating amount of the filament according to the degree of dimming even if there is a deviation of the filament, a manufacturing deviation of the preheating transformer, or other disturbance. An object is to provide an electric lamp lighting device and an illumination device.

Disclosure of the invention [0007] A discharge lamp lighting device according to a first aspect of the present invention includes a variable output lighting device that turns on a hot cathode discharge lamp by converting an output of a DC power supply device into a high-frequency voltage; A heating means with variable output for heating the lamp; a detecting means for detecting the heating amount of the filament; and a filament heating amount corresponding to the dimming degree of the discharge lamp are stored in advance, and according to the dimming signal Control means for controlling the output of the heating means so that the heating amount of the filament detected by the detection means is stored in advance and becomes the filament heating amount. It is characterized by having.

In the invention of the first aspect and the following inventions, the definitions of terms or technical meanings are as follows.

[0008] The direct current power supply device allows a battery, a commercial power supply voltage that is rectified or smoothed as necessary, or others. When rectifying and smoothing the commercial power supply voltage, using an active filter mainly composed of a boost chopper is effective in that the harmonic component of the input current can be reduced and the output voltage can be controlled arbitrarily. .

[0009] The hot cathode type discharge lamp is typically a fluorescent lamp. The present invention is not limited to this, and it can be used for general lighting, sterilization, decoration, display, etc. But it ’s okay.

[0010] The lighting device only needs to convert the output voltage of the DC power supply device into a high-frequency voltage.

For example, an inverter, a converter or a chipper can be used. Further, even if these inverters, converters or chitsutsuba are used, the circuit system is not limited.

[0011] The heating means is either energized by a part of the output of the lighting device, energized by the output of the DC power supply or the output of the commercial power source, or another energized by another power source. It may be. In addition, as a specific configuration thereof, a component such as a transformer or a lighting device provided with a filament heating wire, or a component forming a circuit through which a filament heating current flows may be misaligned.

[0012] The detection means detects the heating amount of the filament, and can be configured to detect the current and voltage of the filament, or to detect the filament temperature.

[0013] The control means stores in advance a filament heating amount corresponding to the dimming degree. In this case The heating amount of the filament is within a range that can prevent the discharge lamp from being shortened due to underheating, and can prevent blackening of the discharge lamp bulb due to overheating. Such a range can be set according to the type or application of the discharge lamp and the cumulative lighting time of the discharge lamp. Storing the filament heating amount according to the dimming degree in advance may be a form in which the filament heating amount according to the dimming degree is stored in the data table, or an arithmetic expression is stored and You may make it obtain | require by calculation each time according to the light control degree. However, the present invention is characterized in that the stored content itself is not characteristic, and the actual filament heating state is fed back and optimized.

[0014] The control means changes the output of the lighting device in response to the dimming signal. Specifically, the control means changes the output by changing the output voltage value of the DC power supply device or controlling the operation of the lighting device. be able to. For example, when the lighting device is composed of an inverter, a converter, a chipper, etc., the output can be changed by controlling the switching frequency and on-duty of these switching devices.

[0015] The control means controls the output of the heating means. In this case, the control structure can be formed according to the structure of the heating means. For example, when a transformer is used as described above, it is sufficient to control the input voltage of the transformer. When a filament winding is provided in a component of the inverter, the applied voltage of the component may be controlled. In addition, when using a component that forms a heating current flow path, the impedance value of the component is controlled, or the flow path is opened and closed with a switch.

[0016] The control means as described above is not limited in terms of structure, such as being configured integrally, and the part for controlling the lighting device and the part for controlling the heating means are configured separately. In short, what is necessary is just to perform the above-mentioned action.

[0017] Further, as the control means as described above, for example, an IC, a microcomputer, a DSP (digital digital processor), and the like, which are configured to perform arithmetic processing, are advantageous in terms of processing speed and small size. Is advantageous. Especially in the case of DSP, it is suitable for controlling the heating amount within about 0.5 seconds when the calculation speed is high.

[0018] The first aspect of the invention changes the amount of power supplied to the discharge lamp by controlling the output of the lighting device in accordance with the dimming signal. As a result, the discharge lamp is lit at a dimming degree according to the dimming signal. The The filament heating amount at this time is detected by the detecting means and controlled so as to be the filament heating amount corresponding to the above-mentioned dimming degree stored in advance. Therefore, the filament is controlled at a preset filament heating amount regardless of filament deviation, manufacturing deviation of heating means, and other disturbance factors.

[0019] Therefore, according to the first aspect of the invention, the filament of the discharge lamp is set in advance according to the dimming degree regardless of the deviation of the filament, the manufacturing deviation of the heating means, and other disturbance factors. It is possible to provide a discharge lamp lighting device that can be heated with a heating amount, can achieve a long life of the discharge lamp, and can also save power.

[0020] A discharge lamp lighting device according to a second aspect of the present invention includes a DC power supply device having a variable output voltage value; a pair of switching devices connected in series to each other and a switching output of the switching device; An inverter that turns on the hot cathode discharge lamp by converting the output voltage of the DC power supply device to a high-frequency voltage; and the filament of the discharge lamp is energized by the switching output of the inverter. Heating means for heating; detecting means for detecting the heating amount of the filament; filament heating amount corresponding to the dimming degree of the discharge lamp is stored in advance, and when the dimming degree is set by the dimming signal The detection means force The output voltage value of the DC power supply device is changed so that the detected filament heating amount becomes the filament calorie heat amount stored in advance. Together, and control means for changing the switching frequency of the inverter such that the dimming degree to which the light output is set for the discharge lamp; characterized by comprising a.

In the second aspect of the invention, being energized by the switching output of the heating means power inverter means that when the output voltage value of the DC power supply is changed, as a result, the output of the heating means Means a changing relationship. The configuration is not particularly limited. For example, it can be formed as described in connection with the invention of the first aspect.

[0022] The discharge lamp lighting device of the second aspect changes the switching frequency of the inverter in accordance with the dimming signal, and changes the resonance output of the series resonance circuit to change the amount of power supplied to the discharge lamp. . As a result, the discharge lamp is lit at a dimming degree corresponding to the dimming signal. On the other hand, the heating amount of the filament is detected by the detecting means, and the amount corresponding to the dimming degree stored in advance is detected. Based on the detected value, the output voltage value of the DC power supply is changed so that the amount of iramentation heating is obtained. The switching output of the inverter changes according to the output voltage value of the DC power supply device, the output of the heating means changes, and the filament heating amount is controlled according to the stored dimming degree. Storing the filament heating amount according to the dimming degree in advance may be a form in which the filament heating amount according to the dimming degree is stored in the data table, or an arithmetic expression is stored and Depending on the dimming degree, it may be obtained by calculation each time. If the dimming level of the discharge lamp is about to deviate from the set value due to a change in the output voltage value of the DC power supply device, the set dimming level can be obtained by controlling the switching frequency.

Therefore, according to the invention of the second aspect, in addition to the effect of the invention of the first aspect, it can be configured by controlling the output voltage value of the DC power supply device and controlling the switching frequency of the inverter. It is possible to provide a discharge lamp lighting device in which the overall configuration of the device can be made relatively simple and can be reduced in size and price.

[0024] A discharge lamp lighting device according to a third aspect of the present invention is the discharge lamp lighting device according to the first or second aspect, wherein the control means includes means for determining the type of the discharge lamp. The filament heating amount is calculated according to the dimming degree and the determination result of the type of the discharge lamp.

According to the discharge lamp lighting device of the third aspect, the type of the discharge lamp can be determined using the identification signal, and the target filament heating amount can be obtained according to the type of the discharge lamp. .

[0026] A discharge lamp lighting device according to a fourth aspect of the present invention is the discharge lamp lighting device according to the first or second aspect, wherein the control means includes means for estimating the cumulative lighting time. The lament heating amount is calculated according to the dimming degree and the estimated result of the cumulative lighting time.

[0027] According to the discharge lamp lighting device of the fourth aspect, the cumulative lighting time corresponding to the age of the discharge lamp can be estimated by detecting the filament voltage, the lamp voltage, etc. of the discharge lamp, and the discharge lamp It becomes possible to obtain the target filament heating amount according to the cumulative lighting time of [0028] The discharge lamp lighting device according to the fifth aspect of the present invention is the discharge lamp lighting device according to the third aspect, wherein the setting of the type of the discharge lamp corresponds to the type of the discharge lamp used. It is performed by the code set by the target switch.

[0029] According to the discharge lamp lighting device of the fifth aspect, it is possible to set using an identification code by means such as a dip switch according to the type of the discharge lamp to be used.

[0030] A discharge lamp lighting device according to a sixth aspect of the present invention is the discharge lamp lighting device according to any one of the first to fifth aspects, wherein the detection means detects a discharge lamp current with respect to a dimming degree. And a means for detecting the sum of the discharge lamp current and the filament current, and calculating the feedback lamp current detection result and the sum of the discharge lamp current and the filament current. Features.

[0031] According to the discharge lamp lighting device of the sixth aspect, the detection means for detecting the filament heating amount includes a discharge lamp current that is a discharge lamp current (lamp current) and a filament current that is a filament heating current. By detecting the sum, the amount of power consumed by the filament (heating amount) can be detected approximately.

[0032] A discharge lamp lighting device according to a seventh aspect of the present invention is the discharge lamp lighting device according to any one of the first to fifth aspects, wherein the detection means detects the amount of filament heating. It is characterized in that it is performed on the filament with the smallest heating amount among a plurality of filaments.

[0033] According to the discharge lamp lighting device of the seventh aspect, when the lower limit of the appropriate amount of filament heating with respect to the change in the discharge lamp current is regarded as important, the filament heating amount is detected by detecting a plurality of filaments of the discharge lamp. Of these, if the heating value is the smallest, it is performed on the filament, and if the detected value exceeds the lower limit of the appropriate amount, it is estimated that all other filaments will exceed the lower limit. Optimal control of quantity is facilitated.

[0034] The discharge lamp lighting device according to the eighth aspect of the present invention is the discharge lamp lighting device according to any one of the first to fifth aspects, wherein the control means calculates a ratio of the heating amount of each filament in a plurality of filaments. The detection means can detect the amount of heating of the filament in any filament of the discharge lamp, and the control means uses the detection location of the detection means and the ratio. To calculate the heating amount of the filament It is characterized by that.

[0035] According to the discharge lamp lighting device of the eighth aspect, when a plurality of discharge lamps are connected in series between the high potential side and the low potential side, the heating amount of each filament is estimated as the low potential side and the low potential side. If the lamp current on the potential side is detected, the leakage current can be roughly estimated and the lamp current in each filament can be estimated based on this. Then, the heating amount of each filament is estimated using the estimation of the lamp current in each filament, and the ratio is held in advance. Based on this assumption, for example, if the heating amount is adjusted to the low potential side, if one of them is detected, then control may be performed according to the ratio, or anyway. If one of them is detected, the heating amount of the other filaments can be adjusted to an optimum range by varying it according to the ratio of each.

[0036] A discharge lamp lighting device according to a ninth aspect of the present invention is the discharge lamp lighting device according to any one of the first, third to eighth aspects, wherein the lighting devices are connected in series to each other. A pair of switching devices and a series resonance circuit to which a switching output of the switching device is supplied; and the heating means connects the resonance capacitor of the series resonance circuit in series with the non-power supply side of the pair of filaments of the discharge lamp. The filament is heated by arranging, and the control means controls the amount of heating of the filament by increasing or decreasing the current flowing through the filament.

[0037] According to the discharge lamp lighting device of the ninth aspect, the configuration is such that the filament heating current flows through the filament and the resonant capacitor that is part of the series resonant circuit, so that the low potential from the high potential side of the discharge lamp is reduced. Leakage current when the discharge lamp current flows to the side is eliminated, and efficient filament heating control can be performed.

[0038] A discharge lamp lighting device according to a tenth aspect of the present invention is the discharge lamp lighting device according to the ninth aspect, wherein the control means is disposed in parallel with the filament of the discharge lamp, and the resonant capacitor. Impedance arranged in series; switch means arranged in series with the impedance to control the inflow current; filament heating amount control means for controlling the heating amount of the filament by turning on and off the switching means; It is characterized by comprising;

[0039] According to the discharge lamp lighting device of the tenth aspect, the filament and the resonant capacitor are used. By configuring a part of the filament heating current to flow through a series circuit of impedance and switch means, the current that flows can be turned on and off by the switch means, and the amount of current flowing to the filament is controlled to control the amount of filament heating. it can.

[0040] A lighting device according to an aspect of the present invention includes a lighting fixture body; a hot cathode discharge lamp mounted on the lighting fixture body; and any one of the first to tenth modes for lighting the discharge lamp. And two discharge lamp lighting devices.

[0041] According to this aspect of the invention, it is possible to provide an illuminating device that has the same effects as the discharge lamp lighting device of any one of the first to tenth aspects of the invention.

Brief Description of Drawings

FIG. 1 is a circuit diagram showing a first embodiment of a discharge lamp lighting device according to the present invention.

FIG. 2 is an enlarged view illustrating a filament terminal current by cutting out a part of FIG.

FIG. 3 is a graph showing the relationship between the lamp current of FIG. 1 and the amount of filament heating.

FIG. 4 is a circuit diagram showing a second embodiment of a discharge lamp lighting device according to the present invention.

FIG. 5 is a circuit diagram showing a third embodiment of a discharge lamp lighting device according to the present invention.

FIG. 6 is a graph showing the relationship between lamp current and filament heating amount for different discharge lamps.

FIG. 7 is a circuit diagram of a fourth embodiment of a discharge lamp lighting device according to the present invention.

FIG. 8 is a diagram showing an example of a discharge lamp type discriminating means.

FIG. 9 is a diagram showing a control flow of a discharge lamp lighting device according to a fifth embodiment of the discharge lamp lighting device of the present invention.

FIG. 10 is an explanatory diagram showing a state of control for the discharge lamp type A according to the fifth embodiment.

FIG. 11 is an explanatory diagram showing a state of control for the discharge lamp type B according to the fifth embodiment.

FIG. 12 is a circuit diagram showing a sixth embodiment of a discharge lamp lighting device according to the present invention.

FIG. 13 is an explanatory diagram of filament terminal current detection showing a part of FIG. 12 in an enlarged manner.

FIG. 14 is a diagram showing the upper and lower limits of the filament heating amount.

FIG. 15 is a diagram showing the position of a lamp current detection point for detecting the heating amount when two lamps are connected in series.

FIG. 16 is a circuit diagram showing a seventh embodiment of a discharge lamp lighting device according to the present invention.

FIG. 17 is a circuit diagram in which the impedance in FIG. 16 is a capacitor. [FIG. 18] FIG. 17 is a diagram showing filament currents when! / And the filament switch are controlled to be off and on, respectively.

FIG. 19 is a perspective view showing an embodiment of a lighting device according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiments of the invention will be described with reference to the drawings.

[0044] [First Embodiment]

Hereinafter, a first embodiment of a discharge lamp lighting device according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a first embodiment of a discharge lamp lighting device according to the present invention, FIG. 2 is an enlarged view illustrating a filament terminal current by cutting a part of FIG. 1, and FIG. 3 is a diagram illustrating a discharge lamp current ( Hereinafter, it is a figure which shows the relationship between lamp current) and a filament heating amount.

Reference numeral 1 denotes a DC power supply device, and a lighting device 2 is connected to the DC power supply device 1. The lighting device 2 converts the output voltage of the DC power supply device 1 into a high-frequency AC voltage of several kHz to several hundred kHz. In addition, the lighting device 2 is configured to be capable of changing its output, and includes current limiting means for stably lighting the discharge lamp. The hot cathode discharge lamp 3 is lit by the output of the lighting device 2.

Reference numeral 4 denotes a heating means for heating the filament of the discharge lamp 3 and is energized by the output of the lighting device 2 in this embodiment.

[0047] One filament of the discharge lamp 3 is provided with detection means 5 for detecting the heating amount of the filament. In this embodiment, the filament current is detected. Specifically, as shown in FIG. 2, the sum of the square of the sum (Il + If) of the lamp current II and the filament heating current If and the square of the filament heating current If is obtained. FIG. 2 is an enlarged view of a part of FIG. 1. In FIG. 2, reference numeral 21 represents a power source equivalent to the output of the heating means 4.

Returning to FIG. 1, the discharge lamp 3 is provided with current detection means 6 in series with the lamp current supply path so as to detect the lamp current value. This current detection means 6 may be used as a lighting detection means for the discharge lamp 3. The heating means 4 is provided with a heating amount control switch 7 in series so that the input to the heating means 4 can be controlled.

[0049] Next, reference numeral 8 denotes control means for controlling the output of the lighting device 2 and the switches. This is for controlling on / off of the switch 7 and for storing the amount of filament heating according to the dimming degree of the discharge lamp 3. As shown in FIG. 3, the stored content of the present embodiment is a correspondence relationship between the lamp current II and the sum of the square of (11 + If) and the square of the filament heating current If. In other words, the lamp current value of the discharge lamp 3 changes according to the degree of dimming, but the appropriate filament heating amount for this lamp current value is set to the square of (Il + If) and the square of the filament heating current If. It is specified in the sum. In Fig. 3, the shaded area is the appropriate range for heating the filament, and the appropriate range expands as the lamp current increases. However, it may be specified simply by the relationship between the lamp current II and the filament heating current If. In short, it may be defined by the relationship between the signal indicating the filament heating state and the signal indicating the dimming lighting state of the discharge lamp. As a storage form, a data table or an arithmetic expression may be used.

[0050] The control means 8 can be constituted by an IC, a microcomputer, a digital signal processor (DSP), etc., and its functions include an arithmetic control unit (CPU), a main memory, a program memory, and a nonvolatile memory. Analog Z digital converter (AD converter), interface circuit (IZF circuit), etc. Then, the control means 8 stores a control sequence according to the control sequence at the start of the discharge lamp 3 and the detection signal from the current detection means 6 as necessary, and executes control according to the stored contents. It may be.

[0051] The control means 8 is supplied with a dimming signal and detection signals from the filament heating amount detection means 5 and the current detection means 6. Then, according to the dimming signal, the output of the lighting device 2 is changed so that the discharge lamp 3 has a predetermined dimming degree. Further, the lamp current is obtained from the detection signal of the current detection means 6, and the ON period of the switch 7 is controlled (on-duty control) so that the amount of filament calorie heat corresponding to the lamp current is obtained.

[0052] Further, if necessary, the control means 8 outputs the output of the lighting device 2 when the lamp current value detected from the current detection means 6 is out of the value corresponding to the dimming degree set by the dimming signal. May be controlled so as to obtain a predetermined lamp current value.

Next, the operation of this embodiment will be described. When the discharge lamp 3 is started, the lighting device 2 performs filament heating output and start voltage output by the start sequence control of the control means 8. When the lighting of the discharge lamp 3 is detected by the detection signal of the current detection means 6, the control means 8 is fully turned on. Or, the output control of the lighting device 2 is performed so that the lighting is performed at the set dimming degree.

In this state, since the lamp current value is detected by the current detection means 6, the control means 8 stores the filament heating amount corresponding to the lamp current value at this time, and stores the data or arithmetic expression. You can know more. On the other hand, since the filament heating amount is detected by the filament heating amount detection means 5, it is possible to discriminate between coincidence or mismatch by comparison with the stored filament heating amount. For example, when the detected filament heating amount is outside the shaded area in FIG. 3, the on / off on-duty of the switch 7 is controlled so that it is inside the shaded area. That is, when the filament heating amount is determined to be insufficient, the on-duty is increased, and when the filament heating amount is determined to be excessive, the on-duty is decreased.

[0055] As a result, the heating amount of the filament is always within the shaded area in Fig. 3, and the life of the discharge lamp can be shortened due to insufficient heating, and the blackening of the bulb and power loss due to scattering of the emitter due to excessive heating can be eliminated.

[0056] [Second Embodiment]

A second embodiment of the present invention will be described. FIG. 4 is a circuit diagram showing a second embodiment of the discharge lamp lighting device according to the present invention. In FIG. 4, parts that are the same as or correspond to those in FIG.

In the present embodiment, a half-bridge type inverter is used as the lighting device 40. In this inverter, a pair of MOS FETs 41 and 42 connected in series with each other are connected between the output terminals of the DC power supply device 1, and a series resonance circuit 43 is provided in parallel with one FET 42. The series resonance circuit 43 includes a DC cut capacitor 44, a current limiting and resonance inductor 45, and a resonance capacitor 46. Inductor 45 originally functions as a ballast.

Further, the heating means 47 of the present embodiment is formed by a series circuit of a DC cut capacitor 48 and a filament heating transformer 49. Symbols a and b indicate current detection points necessary for heating amount detection in the filament heating amount detection means 5.

Next, the operation of this embodiment will be described. The control means 8A controls the switching frequency of the pair of MOS type FETs 41 and 42 according to the dimming signal. From this point, the series resonant circuit 43 Since the frequency of the switching output supplied to the lamp changes, the resonance output changes and the power supplied to the discharge lamp 3 changes. That is, the discharge lamp 3 is lit at a predetermined dimming degree set by the dimming signal. The lamp current value in this state is detected by the current detection means 6, the filament heating amount is detected by the filament heating amount detection means 5, and the control means 8A has a filament heating amount corresponding to the lamp current value at this time. Controls on / off of switch 7. Therefore, the operation is the same as in FIG.

[0060] [Third embodiment]

A third embodiment of the present invention will be described. FIG. 5 is a circuit diagram showing a third embodiment of the discharge lamp lighting device according to the present invention. In FIG. 5, the same or corresponding parts as those in FIG. 1 or FIG.

[0061] The DC power supply device 50 of the present embodiment uses an active filter made up of a boosting chiba. That is, the DC power supply 50 includes a rectifier 52 that rectifies the output of the commercial AC power supply 51, a MOS type FET 54 that can short-circuit the output terminals of the rectifier 52 via the inductor 53, and the FET 54 and the diode 55. And a smoothing capacitor 56 connected in parallel via

In the present embodiment, the switch 7 in the first and second embodiments is omitted, and the on-duty of the MOS FET 54 can be controlled by the control means 8B so that the output voltage of the DC power supply device 50 can be controlled. Change the value.

[0063] The operation of the present embodiment will be described. The control means 8B controls the switching frequency of the pair of MOS FETs 41 and 42 of the lighting device 40 according to the dimming signal. As a result, the power supplied to the discharge lamp 3 changes, and the discharge lamp 3 is lit at a predetermined dimming degree set by the dimming signal. The lamp current value in this state is detected by the current detection means 6, the filament heating amount is detected by the filament heating amount detection means 5, and the control means 8B has a filament heating amount corresponding to the lamp current value at this time. In addition, it controls the on-duty of the MOS FET54. Since the output of the DC power supply device 50 is changed by controlling the on-duty of the MOS FET 54 by the control means 8B, the voltage applied to the heating means 47 also changes. Thereby, the filament heating current is controlled, and the filament heating amount can be controlled. [0064] Note that when the output voltage of the DC power supply device 50 changes, the resonance voltage value also changes, and the power supplied to the discharge lamp 3 also changes. By controlling the switching frequency of 40 pairs of MOSFETs 41 and 42 so that the detection value of the current detection means 6 has a predetermined dimming degree, the switching frequency is stabilized to the set value of the lamp power. be able to.

[0065] [Fourth embodiment]

A fourth embodiment of the present invention will be described with reference to FIGS. Figure 6 shows the relationship between lamp current and filament heating for different discharge lamps.

In FIG. 6, the horizontal axis represents the lamp current II of the discharge lamp, and the vertical axis represents the sum of the square of the current (11+ If) and the square of the filament heating current If, corresponding to the filament heating amount. Fig. 6 shows the upper and lower limits of the filament heating amount for the dimming lamp current II for each of the 40-litre class discharge lamps FLR40S, FL40SS, and FHF32. Therefore, when these discharge lamps are lit in common in the embodiments of FIGS. 1, 4 and 5, the shaded area in FIG. 6 is the appropriate filament heating range for all discharge lamps (common to all discharge lamps). Therefore, the heating amount of the filament is controlled so as to be within this proper range.

[0067] In FIG. 6, no shaded portion exists in the region where the lamp current is small. Therefore, ideally, the dimming operation should be limited with the part where the shaded part disappears as the lower limit of the dimming lamp current II. Alternatively, it is possible to provide means for detecting the type of discharge lamp so that the filament is heated within the appropriate range of each discharge lamp.

FIG. 7 shows a circuit diagram of a fourth embodiment of a discharge lamp lighting device according to the present invention, and FIG. 8 shows an example of a discharge lamp type discriminating means. FIG. 7 is almost the same as the configuration of FIG. 4 described above.

For example, in FIG. 7, the DC power source 1 is converted to AC by an inverter that is a lighting device 40, and a high voltage necessary for lighting the discharge lamp 3 is obtained using the series resonance circuit 43. As one form of the filament heating circuit as the heating means 47, a heating circuit capable of controlling the heating amount by a switch 7 using a MOSFET as shown in FIG. 7 is shown. The detection circuit 60 including the filament heating amount detection means detects electrical characteristics such as discharge current or voltage, filament current or voltage. The control circuit 8C, which is the control means, In addition to the lighting control for controlling the inverter 40, the filament heating circuit 47 can also be controlled according to the signal. For symbols A, B, and C, A is a lamp voltage detection point, B is a lamp current detection point, and C is a filament heating amount detection point. As a current detection point, a minute resistance means that can ignore a voltage drop with respect to the calo heat circuit 47 and the resonance circuit 43 can be used.

[0069] The filament heating circuit 47 is controlled such that a target value of the filament heating amount corresponding to the dimming degree is given and the filament heating amount corresponding to the target value is obtained. In FIG. 7, the heating amount connected to the heating circuit 47 so that the detected value of the filament heating amount given by the detection circuit 60 approaches the target heating amount set by the control circuit 8C (or the detection circuit 60). Controls the ON period of the control switch 7. At this time, the optimum value of the filament heating amount is generally determined according to the dimming level given by the dimming signal, and the dimming level is also disclosed in Japanese Patent Application Laid-Open No. 2005-235619, which is a prior art. The circuit is controlled to give a filament current value according to the current. However, in the conventional technology, it has not been possible to confirm by feedback to the control means that the filament has actually reached the optimum value. Also, the optimum filament heating value itself varies depending on the type of the discharge lamp 3 and the cumulative lighting time, but there was no control taking these into consideration.

For example, when the filament heating amount is determined from the amount of current flowing into the terminal of the discharge lamp 3, the difference between the upper limit and the lower limit of the heating amount depending on the type of the discharge lamp is as shown in FIG. For example, when the target heating amount of the FHF32 lamp is set on the circuit side of the control circuit 8C (or the detection circuit 60) and set near the lower limit in FIG. In FLR40 and FL40, the filament heating is set below the lower limit of each, leading to a shortened life of the discharge lamp. In addition, in all three types shown in Fig. 6, the region that gives the optimum filament heating amount is the shaded area in the figure, so that the entire range of dimming lamp current II is covered. Can not be optimized. Similarly, the passage of a long cumulative lighting time, for example, exceeding 1000 hours in a discharge lamp promotes the wear of the filament emitter, and therefore the filament heating characteristics vary depending on the length of the cumulative lighting time. For this reason, it is necessary to determine the target value of the heating amount according to the cumulative lighting time even for the same discharge lamp. Therefore, in the present embodiment, the discharge lamp lighting device is provided with a discharge lamp type discriminating means or an accumulated lighting time estimation means, and a filament heating amount target according to the discharge lamp type and the cumulative lighting time. It is characterized by controlling the filament heating circuit 47 so as to be a value.

[0072] As the means for determining the type of the discharge lamp, as shown in FIG. 8, a means for enabling the control circuit 8C to recognize the type of the discharge lamp 3 using an external setting switch or the like is provided. FIG. 8 shows an example of the dip switch 61 for setting 0 or 1 (black is a set value). Here, if the number of power bits indicating a 2-bit dip switch is increased, the type of the corresponding discharge lamp can be a value obtained by raising 2 to the power of the number of bits. By setting the switches corresponding to the types of external power discharge lamps A, B, and C as shown in Fig. 8, the target value of the filament heating amount can be set according to the discharge lamp type. Note that the discharge lamp type discriminating means is not limited to this. When the type of discharge lamp is limited to some extent, it can also be determined by detecting the discharge lamp voltage (called lamp voltage) according to the tube diameter. Can do.

As for the estimation of the cumulative lighting time, a spot progress method is known in which the filament wear pressure is also known from the filament voltage during lighting. In addition, due to the demand for initial illuminance correction, a method that includes a means for measuring the cumulative lighting time inside or outside the control circuit is also widely known. Using these, it is possible to set the target value of filament heating amount according to the cumulative lighting time

[0074] According to the present embodiment, it is possible to prevent the discharge lamp from being shortened in life and prematurely blackened by optimizing the amount of filament heating even during discharge lamp dimming. The target value of the filament heating amount can be set according to the dimming level and the discharge lamp type or the cumulative lighting time of the discharge lamp, and the filament heating amount can be further optimized.

[0075] [ ^Fifth Embodiment]

A fifth embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a control flow for explaining a fifth embodiment of the discharge lamp lighting device of the present invention, and FIGS. 10 and 11 are diagrams for explaining the control of the filament heating amount for different types of discharge lamps. Since the configuration of the discharge lamp lighting device is the same as that of FIG. 7, it will be described with reference to the circuit diagram of FIG.

In FIG. 7, the output voltage of the DC power supply 1 can be converted to AC using an inverter that is the lighting device 40, and a high-frequency discharge voltage can be obtained through the series resonance circuit 43. . As shown in FIG. 7, the filament heating circuit 47 has a configuration in which electric power is transmitted to the filament using a transformer, and the switch 7 controls on / off of the heating current or voltage. The heating amount of the filament can be controlled by controlling the ON period of the switch 7.

[0077] The detection circuit 60 in FIG. 7 detects electrical characteristics such as the current or voltage of the discharge lamp, the filament current or voltage. The control circuit 8C is connected to the heating circuit 47 so that the difference between the filament heating amount obtained based on the detection value of the detection circuit 60 and the target heating amount set in the control circuit 8C is minimized. Control on-duty.

FIG. 9 is a diagram showing a control flow. The heating amount of filament obtained by the heating amount detection circuit of the detection circuit 60 is the difference between the dimming signal, the type of discharge lamp, the cumulative lighting time of the discharge lamp, etc. The control circuit 8C controls the on-duty of the switch connected to the heating circuit 47 so as to minimize it. In Fig. 9, the target value of the filament heating amount is given as the reference value (Ref) of the error amplifier 62 so that the difference from the detected value of the filament heating amount detected by the detection circuit 60 is minimized. Control.

[0079] The configuration in FIG. 9 is a configuration in which software calculation processing is performed even in a hardware configuration in that control for detecting the heating amount and feeding back the difference from the target heating amount is performed. There may be. Since general feedback control is used here, Error = (target value)-(detected value), and (control amount) = Kp * Error + Ki J Error * dt (where Kp and Ki are feedback gains) It is also possible to perform control using a general-purpose feedback method such as PI control that controls the coefficient to give

[0080] For example, a method for optimizing the filament heating amount based on the terminal inflow current of the discharge lamp is considered. Here, the term “terminal” refers to a terminal at both ends of the filament disposed at the end of the discharge lamp. 10 and 11, the horizontal axis represents the lamp current II, and the vertical axis represents the square sum ILH ² + ILL ² of the terminal inflow current. Discharge lamps A and B are different types of discharge lamps. ILH is the terminal inflow current on the side where the lamp current II flows in at both ends of the filament, and ILL is the terminal inflow current on the side where II does not flow. At this time, a target line corresponding to the type of discharge lamp can be drawn as shown in discharge lamps A and B in FIGS. The target value shown in Fig. 9 is such a target line, that is, a target function of (ILH ² + ILL ² ) = a * Il + b (a and b are constants, * is multiplication). Here, (ILH ² + ILL ² ) corresponds to the heating amount of the filament. (ILH ² + ILL ² ) After obtaining the detected amount, feedback control is performed by giving the target function shown in FIG. 10 and FIG. 11 as the target value in FIG. 9, and the filaments indicated by black circles in FIG. 10 and FIG. The detected value (measured value) of the current heating amount is feedback controlled to the target line that is an appropriate value. Fig. 10 shows the feedback control for discharge lamp A, and Fig. 11 shows the feedback control for discharge lamp B. It can be seen that the amount of increase in the heating amount, which is the control amount, differs depending on the type of discharge lamp, depending on the feedback control of the two different types of discharge lamps A and B.

[0081] According to the present embodiment, it is possible to prevent the filament heating from being excessively large or small during dimming of the discharge lamp, to shorten the life of the discharge lamp and to prevent premature blackening of the tube wall. By controlling the filament heating amount by feedback, it is possible to control the heating means corresponding to the actual heating amount. The target value of the optimum filament heating amount can be set according to the dimming degree, that is, the lamp current, and the optimum filament heating amount target value considering the change in the heating amount depending on the type of discharge lamp and the cumulative lighting time. Can be set.

[0082] [Sixth Embodiment]

A sixth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a circuit diagram showing a sixth embodiment of the discharge lamp lighting device of the present invention. Fig. 13 is an explanatory diagram of filament terminal current detection, showing a part of Fig. 12 in an enlarged manner, Fig. 14 is a diagram showing the upper and lower limits of the filament heating amount with respect to changes in the lamp current, and Fig. 15 is the heating in series lighting of two lamps. It is a figure which shows the position of the lamp current detection point for quantity detection.

The configuration of the discharge lamp lighting device shown in FIG. 12 is the same as that in FIG. As a means for detecting the filament heating amount, there is a method using the sum of the lamp current II and the filament current If. In Fig. 12, when the sum of II and If is detected as the filament heating amount, the sum of II and If is detected on the low potential side (stable potential side) filament of the discharge lamp lighting device. An example is shown.

In FIG. 12, the DC power supply device 1 is converted into AC by an inverter which is a lighting device 40, and a high-voltage and high-frequency voltage is supplied to the discharge lamp 3 through the series resonance circuit 43. Filament heating is performed using a heating circuit 47. The control circuit 8C controls the inverter 40 according to the dimming signal, dimming the discharge lamp 3, and controlling the switch 7 of the heating circuit 47. Therefore, the optimum filament heating amount is controlled.

As shown in FIG. 12, an Il + If detection circuit is provided as a filament heating amount detection circuit. By detecting II at the same time, the detected value of 11+ If can also be calculated by 11¾. At detection point a on the low potential side (stable potential side) filament in Fig. 12, the sum of II and If is obtained, and the sum of currents at detection point a on the lowest potential filament is detected. If the detected value exceeds the lower limit, it is estimated that all other filaments (high potential side filaments in Fig. 12) will have a heating amount exceeding the lower limit, making filament optimization control easy. Become. The same is true for detection of II at detection point b. For detection of Il + If and detection of II, for example, a minute resistance means such that the voltage drop to the heating circuit 47 and the resonance circuit 43 can be ignored can be used.

The optimum filament heating amount can be given as an appropriate range in the hatched area of FIG. 14 using the terminal inflow current of the discharge lamp as shown in FIG. In FIG. 13, assuming that the discharge current II is not shunted to the illustrated heating circuit 47 side, ILH = Il + IfC is given and ILL = If is given. At this time, if the value of ILH ² + ILL ² for II is controlled between the lower limit and the upper limit (shaded area) in FIG. 14, the filament heating amount during discharge lamp lighting will be optimized. . Assuming that the lamp current II is detected for the dimming level setting, the heating amount can be detected by looking at I LH ² + ILL ² . Here, the sum of Il + If is detected and used for feedback control.

[0087]! Shi +! Since ni + e can be written as 屮 ^, if Il + If = a, ILH ² + ILL ² = 2 a ² — 2all + ll ² etc. can be written. Therefore, ILH ² + ILL ² is given as a function of the detected amount a = 11 + If and II, and the control amount of the heating circuit 47 is set so that this value is between the upper and lower limits. do it. As a result, the optimum value of the filament heating amount can be obtained while simplifying the filament heating amount detection circuit 60A.

[0088] In general, the amount of filament heating can be detected by detecting 11 + 1 in an arbitrary filament. As shown in Fig. 15, when two discharge lamps are used and the lamps are connected in series, 11 + 11 ^ may be detected for the high potential side filament (detection point 1), and the low potential side filament is detected. Yes (detection point 3). It may also be detected at a position corresponding to an intermediate potential (detection point 2). However, especially when controlling the discharge lamp, To the capacitive component (this capacitive component is a stray capacitance that exists between the high potential side and the low potential side). The magnitude of the discharge current measured on the current side decreases. The lower the potential, the smaller the discharge current that contributes to filament heating. For this reason, by detecting the value of detection point 3 at the lowest potential and controlling the detected value to exceed the lower limit shown in FIG. 14, the filaments that do not fall below the lower limit shown in FIG. It is possible to secure a heating amount. As a result, it is possible to prevent the life of the discharge lamp from being shortened due to insufficient heating in any filament.

[0089] For example, when a plurality of (two in the figure) discharge lamps are connected in series between the high potential side and the low potential side as shown in FIG. 15, the control means heats each filament in the plurality of filaments. The heating amount detection means can detect the filament heating amount in any filament of the discharge lamp, and the control means can detect the heating amount detection means. The heating amount of the filament may be set by calculation using the ratio. This is due to the following reason. That is, when multiple discharge lamps are connected in series between the high potential side and the low potential side, if the lamp currents at the high potential side and the low potential side are detected as an estimate of the heating amount of each filament, the leakage current is roughly estimated. Based on this, the lamp current in each filament can be estimated. Then, the heating amount of each filament is estimated using the estimation of the lamp current in each filament, and the ratio is held in advance. In this case, for example, if it is desired to adjust the heating amount to the low potential side, if any one is detected, then control may be performed according to the ratio, or any one is detected. In this case, the heating amount of the other filaments can be adjusted to an optimum range by varying the heating amount according to each ratio.

[0090] According to the present embodiment, by optimizing filament heating during dimming of the discharge lamp, it is possible to shorten the life of the discharge lamp and prevent early blackening. The filament heating amount of the discharge lamp can be detected with a simple circuit configuration. The amount of heating of the discharge lamp filament can be detected for each filament, but by detecting II + 1 on the low potential side (stable potential side) filament, if the detected value exceeds the lower limit, All other filaments can be optimized by giving an optimum filament heating amount exceeding the lower limit. Follow Thus, even if the filament heating amount detection point is limited to one point, heating control that does not shorten the life of the discharge lamp can be performed. In addition, when a plurality of discharge lamps are connected in series between the high potential side and the low potential side, the amount of heating of each filament is estimated using the estimation of the lamp current in each filament, and the ratio is held in advance. If the heating amount of any one of the filaments is detected, the heating amount of the other filaments can be controlled or varied in accordance with the respective ratios to make the optimum heating amount range.

[0091] [Seventh embodiment]

A seventh embodiment of the present invention will be described with reference to FIGS. FIG. 16 is a circuit diagram showing a seventh embodiment of the discharge lamp lighting device of the present invention. Fig. 17 is a circuit diagram in which the impedance in Fig. 16 is a capacitor, and Fig. 18 is a diagram showing the filament current when the filament switch is controlled to OFF and ON in Fig. 17, respectively.

In FIG. 16, a lighting device 40 includes a pair of switching devices connected in series with each other and a series resonance circuit 43 to which a switching output of the switching device is supplied (reference numeral 43 is not shown) As in FIG. 7, the heating means includes the resonance capacitor 46 of the series resonance circuit 43 in series with the non-power supply side of the pair of filaments of the discharge lamp 3. Therefore, the control means uses the impedance Zf (Zf is at least one of Zfl and Z1) and the switch SWf (SWf is at least one of SWfl and SWf2). It is possible to control the heating amount of the filament by performing the control to increase or decrease in this manner. Compared with the configuration of FIG. 7, in FIG. 16, the heating means 47 using the preheating transformer of FIG. 7 is eliminated, the resonant capacitor 46 is arranged in series on the non-power supply side of the pair of filaments of the discharge lamp 3, and each filament A series circuit of impedance Zf and switch SWf is connected in parallel at both ends.

In this embodiment, the half-bridge inverter as the lighting device 40 is configured such that a pair of MOS FETs 41 and 42 connected in series are connected between the output terminals of the DC power supply device 1 and connected to one FET 42. On the other hand, a series resonant circuit 43 is provided in parallel. The series resonance circuit 43 includes a DC cut capacitor 44, a current limiting and resonance inductor 45 (hereinafter abbreviated as Lr), and a resonance capacitor 46 (hereinafter abbreviated as Cr).

[0094] DC power supply 1 is converted into alternating current using an inverter that is lighting device 40, and series resonance is performed. Using circuit 43, high-pressure high-frequency power is applied to discharge lamp 3. The discharge lamp 3 is turned on using high-pressure high-frequency generated at both ends of Cr. At this time, since the filament of the discharge lamp 3 is in series with Cr, it is heated by the alternating current flowing through Cr.

[0095] Therefore, the heating means of the present embodiment arranges Cr of the series resonance circuit 43 and the filament of the discharge lamp 3 in series, and heats the filament.

[0096] Further, the control circuit 8D as a control means has a function of controlling the output of the inverter 40 in accordance with the dimming signal and controlling the heating amount of the filament by increasing or decreasing the current flowing through the filament. Is. For symbols A, B, and C, A is a lamp voltage detection point, B is a lamp current detection point, and C is a filament heating amount detection point. For the current detection point, it is possible to use a very small resistance means such that a voltage drop with respect to the resonance circuit 43 or the like can be ignored.

[0097] In the configuration of Fig. 16, as shown in Fig. 7 and Fig. 12, the current that also leaks the high potential side force via the stray capacitance is suppressed, and the filament is heated to the filament via the resonant capacitor Cr in addition to the lamp current. A current as a current flows.

[0098] The control means including the control circuit 8D is arranged in parallel with the filament of the discharge lamp 3, and is arranged in series with the resonance capacitor Cr, and is arranged in series with the impedance Zf, and the inflowing current And a filament heating amount control means (a part of the control circuit 8D) for controlling the heating amount of the filament by turning on and off the switch SWf.

[0099] When the dimming of the discharge lamp 3 is controlled by the frequency of the inverter 40, the current flowing through Cr is also controlled. As a result, when the light is adjusted, the amount of heating of the filament changes in accordance with the increase or decrease of the amount of current flowing through Cr. In this method, the current flowing through the filament of the lamp and the lamp is determined by the impedance component of Cr given by ΐΖ2 π ίΟ from the values of the frequency f and Cr during dimming. For this reason, the current flowing through the filament changes by controlling the frequency of the inverter by dimming control. It is necessary that the value of r and the frequency to be controlled are given so that the filament current can obtain the optimum heating amount.

[0100] However, in practice, even if the Cr value, the control frequency, etc. are determined as described above, there is a difference between the actual heating amount and the optimum heating amount. Therefore, in the present embodiment, the detection circuit 60 includes The electrical characteristics of the discharge lamp's current and voltage and the heating amount of the filament are detected, and the control circuit controls the frequency of the inverter and the on / off of the switches SWfl and SWf2 from the detected values. Impedance Zf is arranged in parallel on the filament of the discharge lamp. In the switch SWi¾off state, the filament current is determined only by the Cr as described above. On the other hand, when the switch SWl ^ is turned on, a current is shunted to the impedance Zf, so that the current flowing through the filament can be reduced. Thus, in FIG. 16, the amount of heating of the filament can be controlled because the switches SWfl and SWf2 are turned on and off. The target value of the heating amount is determined by the dimming level, the type of discharge lamp, and the cumulative lighting time, and the on-duty of SWfl and SWf2 is controlled so that the detected heating amount matches the target value.

[0101] FIG. 17 shows an example in which capacitors (Cfl, C12) are provided as impedance components arranged in parallel with the filament. When SWfl is turned on, Cfl and the filament are connected in parallel. For this reason, the current used for heating the filament is shunted to the Cfl side and the filament side. Thereby, the filament heating amount can be controlled. For example, the resistance value of the filament when the discharge lamp is lit is generally about 10 Ω. On the other hand, if the lighting frequency f is 50 kHz and Cfl = 0.47 uF, 1/2 π ίΟί1 = 6. 77 Ω, which is the order of the resistance value of the filament.

[0102] Figure 18 illustrates the effect of SWf control. When SW1¾ is on, the current flowing through the filament decreases compared to when it is off. Therefore, by controlling the ON period of the switch, the current is controlled to be intermediate between the current flowing through the filament when ON and the current flowing through the filament when OFF, and the heating amount is controlled by the absolute value.

[0103] In Fig. 17, an example of a capacitor is given as an impedance arranged in parallel to the filament, but it may be an inductor or a combination of a capacitor and an inductor. Resistor components may be placed in parallel, but in order to dissipate effective power, it is better to use a capacitor or inductor.

[0104] When the filament is heated with the current flowing through the resonant capacitor Cr as described above, the effect of the current leaking from the high potential side of the discharge lamp can be ignored, so the amount of filament heating is uniform between the high potential side and the low potential side. There is also an advantage that can be obtained. According to this embodiment, in the discharge lamp, the life of the discharge lamp can be shortened and early blackening can be prevented by optimally controlling the heating amount of the filament. By using the current flowing through the resonant capacitor for heating the filament, the effect of leakage current during dimming of the discharge lamp is suppressed, and the amount of heating varies according to the potential of the filament (high potential side, low potential side). Can be suppressed. In addition, the current that flows through the resonant capacitor is used to heat the filament! Even so, the filament heating amount can be controlled.

Furthermore, according to the present embodiment, since the configuration of the heating means for heating the filament is configured to eliminate the loss of leakage current, the filament heating amount is detected regardless of whether the filament is on the high potential side or the low potential side filament. Therefore, it can be carried out on any filament of the discharge lamp, and the degree of freedom in designing the discharge lamp circuit can be expanded.

Next, an embodiment of a lighting device according to the present invention will be described with reference to FIG. FIG. 19 is a perspective view showing an embodiment of a lighting device according to the present invention. In the case of Fig. 19, the lighting device is a ceiling-mounted lighting fixture. Reference numeral 70 denotes a lighting fixture body, 71 denotes a socket provided in the lighting fixture body 70, 72 denotes a reflector, 73 denotes a hot cathode discharge lamp mounted in the socket 71, and 74 denotes a lamp built in the lighting fixture body 70. It is an electric lamp lighting device. As the discharge lamp lighting device, the one described in any of the first to seventh embodiments is used.

In the illuminating device having such a configuration, the filament heating of the discharge lamp 73 can always be appropriately performed, and the life can be prevented from being shortened and the power loss can be reduced.

[0109] This application is filed on January 25, 2006. This application was filed on the basis of priority claim claiming Japanese Patent Application No. 2006-016653. It shall be cited in the specification of this application and the scope of claims.

Claims

The scope of the claims

[1] A variable output lighting device that turns on the hot cathode discharge lamp by converting the output of the DC power supply device to a high-frequency voltage;

Variable output heating means for heating the filament of the discharge lamp;

Detection means for detecting the heating amount of the filament;

The filament heating amount corresponding to the dimming degree of the discharge lamp is stored in advance, the output of the lighting device is controlled according to the dimming signal, and the heating amount of the filament detected by the detection means is Control means for controlling the output of the heating means so as to obtain the filament heating amount stored in advance;

A discharge lamp lighting device comprising:

[2] A DC power supply with variable output voltage value;

A pair of switching devices connected in series with each other and a series resonance circuit to which the switching output of the switching device is supplied, and the output voltage of the DC power supply device is converted into a high-frequency voltage to produce a hot cathode type discharge lamp. A lighted inverter;

Heating means energized by the switching output of the inverter to heat the filament of the discharge lamp;

Detection means for detecting the heating amount of the filament;

The filament heating amount corresponding to the dimming degree of the discharge lamp is stored in advance, and when the dimming degree is set by the dimming signal, the filament heating amount detected by the detection means force is stored in advance. Control means for changing an output voltage value of the DC power supply device so as to be a heating amount and changing a switching frequency of the inverter so that a light output of the discharge lamp has a set dimming degree;

A discharge lamp lighting device comprising:

[3] The control means includes means for determining the type of the discharge lamp, and calculates the amount of heating of the filament according to the dimming degree and the determination result of the type of the discharge lamp. The discharge lamp lighting device according to claim 1 or 2.

[4] The control means includes means for estimating the cumulative lighting time, and calculates a filament calorie heat amount according to the dimming degree and the estimation result of the cumulative lighting time. The discharge lamp lighting device according to claim 1 or 2.

[5] The discharge lamp lamp according to claim 3, wherein the setting of the type of the discharge lamp is performed by a code set by a mechanical switch corresponding to the type of the discharge lamp used. apparatus.

[6] The detection means includes a means for detecting a discharge lamp current with respect to a dimming degree, and a means for detecting the sum of the discharge lamp current and the filament current. The detection result of the discharge lamp current and the discharge lamp 6. The discharge lamp lighting device according to claim 1, wherein the sum of the current and the filament current is fed back and calculated.

[7] The detection means according to any one of [1] to [5], wherein the filament heating amount is detected in a filament with the smallest heating amount among a plurality of filaments of the discharge lamp. Discharge lamp lighting device.

[8] The control means has a ratio of each filament heating amount in a plurality of filaments in advance, and the detection means can detect the filament heating amount in any filament of the discharge lamp. And

The discharge lamp lighting according to any one of claims 1 to 5, wherein the control means sets the heating amount of the filament by calculating using the detection location of the detection means and the ratio. apparatus.

[9] The lighting device includes a pair of switching devices connected in series with each other and a series resonant circuit to which a switching output of the switching device is supplied,

The heating means heats the filament by arranging a resonance capacitor of the series resonance circuit in series on the non-power supply side of the pair of filaments of the discharge lamp,

9. The discharge lamp lighting device according to claim 1, wherein the control unit controls the heating amount of the filament by increasing or decreasing a current flowing through the filament. 10. .

[10] The control means includes

An impedance arranged in parallel with the filament of the discharge lamp and arranged in series with the resonant capacitor;

Switch means arranged in series with said impedance to control the incoming current; Filament heating amount control means for controlling the heating amount of the filament by turning on and off the switch means;

10. The discharge lamp lighting device according to claim 9, further comprising:

A lighting fixture body;

A hot-cathode discharge lamp mounted on the luminaire body;

An illumination device comprising: the discharge lamp lighting device according to any one of claims 1 to 10 for lighting the discharge lamp.