JP2002324689A - Discharge lamp lighting device and lighting fixture using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device with high reliability which is made to identify kinds of discharge lamps automatically and appropriately, adequately performs preheating control and lighting control based on the identification results of the discharge lamps, and can be commonly used for a plurality of different discharge lamps. SOLUTION: When shifting in turn from each mode of preheating, starting and lighting in lighting a discharge lamp LA, a filament electric characteristics detecting means FCD which detects difference of electric characteristics of filaments ft1, ft2 of the discharge LA in a period when minute electric current is passed through them by a control circuit CC before the preheating mode, arc after-lighting electric characteristics detecting means LCD which detects electric characteristics after the discharge lamp LA is lit in a starting mode, and a discharge lamp identification means DCM which identifies kinds of discharge lamps LA according to detection results of the both electric characteristics detecting means FCD, LCD are provided, and a control suited for the discharge lamp LA is performed according to the identification result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device and a lighting fixture using the same.

[0002]

2. Description of the Related Art Discharge lamps are widely used for various purposes.
Conventionally, various standard products have been provided. For example, if a discharge lamp (lamp) having a length of 4 feet is taken, FHF32 (Hf dedicated lamp: 2W of 32W, 45W).
FLR40S (rapid general lamp: 40W), FLR40S / 36 (rapid power saving lamp 36W), FL40S (glow general lamp: 4)
0W), FL40SS / 37 (glow power saving lamp:
37W). And
Each discharge lamp has not only structural differences such as tube diameter, filament structure, or filled gas composition in the tube,
Optimal starting and lighting of each discharge lamp, such as filament preheating conditions, starting voltage required for starting lighting, lamp voltage for steady lighting, lamp current, starting voltage for starting, and preheating current characteristics for preheating. There are various differences also in conditions.

Conventionally, a discharge lamp of the type which has the same shape and the same filament structure as a rapid-type lamp, and has similar electric characteristics to each other and has a difference of about 10%, for example, , General lamp (FLR40
S: lamp current = 380 mA, lamp voltage = 105 V,
Lamp power = 40W) and power saving type lamp (FLR40S)
/ 36: lamp current = 400 mA, lamp voltage = 90
V, lamp power = 36 W)
In some cases, the discharge lamps are shared by using different types of discharge lamp lighting devices.

[0004]

However, as described above, all of the various types of discharge lamps having different tube diameters and filament structures, and various conditions for starting and lighting, are used as one type of discharge lamp lighting device. If they are used in common, the following problems will arise.

(1) For example, in a configuration of a general lighting resonance circuit including an inductor, a capacitor, and a discharge lamp, when a plurality of different types of discharge lamps are turned on, the difference in the lighting output increases, and Lighting causes problems such as bright or dark. (2) Further, if the filament preheating condition is not optimal, blackening of the tube end or early breakage of the filament may occur. There is a possibility that the lamp (filament) may be deteriorated at an early stage depending on the current condition, even in the case of the constant filament current at the time of steady lighting. (3) Furthermore, when the ambient temperature of the lamp is low,
In an argon gas lamp, the cations of mercury in the lamp tube are concentrated by the DC electric field and are biased toward the cathode, so that the amount of mercury at the anode decreases. As a result, the cathode emits no light from the phosphor due to the mercury vapor, and a phenomenon called a cataphoresis phenomenon in which red light is emitted by argon occurs. Further, in the mixed gas lamp, the discharge becomes unstable, and a phenomenon called a moving fringe that appears as a striped pattern in which the lamp meanders like a wave occurs due to a decrease in light output and flicker.

As described above, when various types of discharge lamps having different shapes and ratings are used in common by one type of discharge lamp lighting device, the disadvantages described in the above (1) to (3) occur.
In the prior art, at present, a dedicated discharge lamp lighting device is used for each discharge lamp having a different shape or rating. For this reason, various types of discharge lamp lighting devices must be prepared according to the type of discharge lamp, resulting in an increase in cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to firstly make it possible to automatically and more accurately identify the type of discharge lamp within a short time. Secondly, preheating control and lighting control should be appropriately performed based on the identification result of the discharge lamp so as to satisfy the conditions suitable for the identified discharge lamp, and thirdly, one type of these results can be obtained. It is an object of the present invention to provide a highly reliable discharge lamp lighting device capable of sharing a plurality of different types of discharge lamps with each other.

[0008]

The present invention employs the following structure to achieve the above object. That is,
According to the first aspect of the present invention, there is provided a DC power supply circuit that rectifies a commercial AC power supply and converts the DC power into DC power, and an inverter circuit that turns on / off the output of the DC power supply circuit at a high frequency by a switching element and converts the output to high frequency power. An inverter load circuit including a discharge lamp to which high-frequency power is supplied from the inverter circuit, a control circuit that drives and controls a switching element of the inverter circuit, and a filament preheating unit that preheats a filament of the discharge lamp. And, in the discharge lamp lighting device which sequentially shifts to at least the preheating mode, the starting mode, and the lighting mode when the discharge lamp is turned on, the control circuit applies a small current to the filament for a certain period before the preheating mode. In this case, a filament electric characteristic for detecting a difference in the electric characteristic of the filament within the period. Detecting means, after-lighting electrical property detecting means for detecting electrical properties after the discharge lamp is lit in the starting mode, and discharge lamp identification for identifying the type of the discharge lamp based on the detection results of the two electrical property detecting means. Means, wherein the control circuit performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means.

According to a second aspect of the present invention, there is provided a DC power supply circuit for rectifying a commercial AC power supply and converting the DC power supply to DC power, and turning on / off the output of the DC power supply circuit at high frequency by a switching element to convert the output to high frequency power. An inverter circuit, an inverter load circuit including a discharge lamp supplied with high-frequency power from the inverter circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp. Including
When turning on the discharge lamp, at least a preheating mode,
In the discharge lamp lighting device, which sequentially shifts to the start mode and the lighting mode, and in which the operating frequency of the inverter circuit continuously changes in the start mode, the control circuit causes the filament to be minutely applied to the filament for a certain period before the preheating mode. Filament electric characteristic detecting means for detecting a difference in electric characteristic of the filament during the period when a current flows, discharge lamp lighting detecting means for detecting that the discharge lamp is turned on in the start mode, and discharge lamp lighting Operating frequency detecting means for detecting the operating frequency of the inverter circuit at the time of lighting based on the detection output of the detecting means; and discharge lamp identifying means for identifying the type of the discharge lamp based on the detection outputs of the two detecting means. Wherein the control circuit performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means.

According to a third aspect of the present invention, there is provided a DC power supply circuit for rectifying a commercial AC power supply and converting the DC power supply to a DC power, and the output of the DC power supply circuit is turned on / off at a high frequency by a switching element and converted to a high frequency power. An inverter circuit, an inverter load circuit including a discharge lamp supplied with high-frequency power from the inverter circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp. Including
When turning on the discharge lamp, at least a preheating mode,
In a discharge lamp lighting device, which sequentially shifts to a start mode and a lighting mode, and in which the DC power supply voltage of the DC power supply circuit continuously changes in the start mode, the control circuit controls the filament for a certain period before a preheating mode. A filament electric characteristic detecting means for detecting a difference in electric characteristic of the filament during the period when a very small current is supplied to the filament; a discharge lamp lighting detecting means for detecting that the discharge lamp is lit in the start mode; DC power supply voltage detection means for detecting the DC power supply voltage of the DC power supply circuit at the time of lighting based on the detection output of the lamp lighting detection means, and discharge based on the detection outputs of the filament electric characteristic detection means and the DC power supply voltage detection means. Discharge lamp identification means for identifying the type of electric lamp, wherein the control circuit discharges the electric power based on the identification result of the discharge lamp identification means. The discharge lamp lighting apparatus, characterized by a control adapted to the characteristics.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, a switching current detecting means for detecting a current flowing through the switching element, and the switching current detecting means detects the current flowing through the switching element. A discharge lamp identifying means for identifying a type of the discharge lamp based on a phase difference of the switching current with respect to the high-frequency voltage.

According to a fifth aspect of the present invention, there is provided a DC power supply circuit for rectifying a commercial AC power supply and converting the DC power supply to DC power, and turning on / off the output of the DC power supply circuit at high frequency by a switching element to convert the output to high frequency power. An inverter circuit, an inverter load circuit including a discharge lamp supplied with high-frequency power from the inverter circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp. Including
When turning on the discharge lamp, at least a preheating mode,
In the start-up mode, and in the discharge lamp lighting device that sequentially shifts to the lighting mode, when the control circuit applies a small current to the filament for a certain period before the preheating mode, the difference in the electrical characteristics of the filament is determined within the period. Filament electric characteristic detecting means for detecting, switching current detecting means for detecting a current flowing through the switching element, a phase difference of the switching current detected by the switching current detecting means with respect to the high frequency voltage, and the filament electric characteristic detecting means Discharge lamp identification means for identifying the type of discharge lamp based on the detection output of
The control circuit performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means.

According to a sixth aspect of the present invention, there is provided a DC power supply circuit for rectifying a commercial AC power supply and converting the DC power to DC, and turning on / off the output of the DC power supply circuit at a high frequency by a switching element to convert the output to high frequency power. An inverter circuit, an inverter load circuit including a discharge lamp supplied with high-frequency power from the inverter circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp. Including
When turning on the discharge lamp, at least a preheating mode,
In the start mode, and in the discharge lamp lighting device that sequentially shifts to the lighting mode, after-lighting electrical characteristic detecting means for detecting the electrical characteristics after the discharge lamp is lit in the start mode,
A switching current detecting means for detecting a current flowing through the switching element; a discharge lamp based on a phase difference of the switching current detected by the switching current detecting means with respect to the high-frequency voltage, and a detection output of the after-lighting electrical characteristic detecting means. Discharge lamp identification means for identifying the type of the discharge lamp, and the control circuit performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means.

According to a seventh aspect of the present invention, there is provided a DC power supply circuit for rectifying a commercial power supply and converting it to DC, and an inverter circuit for turning on / off the output of the DC power supply circuit at high frequency by a switching element and converting the output to high frequency power. And an inverter load circuit including a discharge lamp to which high frequency power is supplied from the inverter circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp. When the discharge lamp is turned on, at least a preheating mode, a start mode, and a transition to a lighting mode are sequentially performed, and the discharge lamp lighting device in which the operating frequency of the inverter circuit continuously changes during the start mode. Discharge lamp lighting detection means for detecting that the discharge lamp has been turned on; Operating frequency detecting means for detecting an operating frequency of the inverter circuit at the time of lighting based on output power, switching current detecting means for detecting a current flowing through the switching element, and a switching current detected by the switching current detecting means. Discharge lamp identification means for determining the type of the discharge lamp based on the phase difference with respect to the high-frequency voltage and the detection output of the operating frequency detection means, and the control circuit discharges the discharge lamp based on the identification result of the discharge lamp identification means. It is characterized by performing control suitable for the characteristic of (1).

According to a further aspect of the present invention, there is provided a DC power supply circuit for rectifying a commercial power supply and converting it to DC, and an inverter circuit for turning on / off the output of the DC power supply circuit at high frequency by a switching element and converting the output to high frequency power. And an inverter load circuit including a discharge lamp to which high frequency power is supplied from the inverter circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp. In the discharge lamp lighting device, when the discharge lamp is turned on, at least a preheating mode, a starting mode, and a sequential transition to a lighting mode, and the DC power supply voltage of the DC power supply circuit continuously changes during the starting mode. Discharge lamp lighting detection means for detecting that the discharge lamp is turned on in the start mode, and the discharge lamp lighting detection means DC power supply voltage detection means for detecting a power supply voltage of the DC power supply circuit at the time of lighting based on a detection output; switching current detection means for detecting a current flowing through the switching element; and switching detected by the switching current detection means. A discharge lamp identification unit that identifies a type of the discharge lamp based on a phase difference of the current with respect to the high-frequency voltage, and a detection output of the DC power supply voltage detection unit, wherein the control circuit determines an identification result of the discharge lamp identification unit. It is characterized in that control suitable for the characteristics of the discharge lamp is performed based on this.

According to a ninth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the after-lighting electrical characteristic detecting means detects a lamp voltage applied to both ends of the discharge lamp. Is what you do.

According to a tenth aspect of the present invention, in the configuration according to any one of the first, fourth, and sixth aspects, the after-lighting electric characteristic detecting means detects a lamp current flowing through the discharge lamp. It is.

According to an eleventh aspect of the present invention, in the configuration according to any one of the first, fourth, and fifth aspects, the after-lighting electric characteristic detecting means detects the lamp voltage applied to both ends of the discharge lamp and the discharge voltage. It detects the lamp power obtained from the lamp current flowing through the electric lamp.

According to a twelfth aspect of the present invention, in the configuration according to any one of the first, fourth, and sixth aspects, the after-lighting electrical characteristic detecting means detects an input current supplied from the AC power supply. It is to detect.

According to a thirteenth aspect of the present invention, in the configuration according to any one of the first, fourth, and sixth aspects, the after-lighting electric characteristic detecting means detects the input power supplied from the AC power supply. It is to detect.

According to a fourteenth aspect of the present invention, in the configuration according to any one of the first to thirteenth aspects, the control circuit switches a switching element of the inverter circuit based on an identification result of the discharge lamp identification means. The drive is controlled according to the characteristics of the discharge lamp.

According to a fifteenth aspect of the present invention, in the configuration according to any one of the first to thirteenth aspects, the DC power supply circuit is configured to be capable of controlling a DC output voltage. The DC output voltage of the DC power supply circuit is controlled according to the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means.

According to a sixteenth aspect of the present invention, in the configuration according to any one of the first to fifteenth aspects, the control circuit performs the identification in the preheating mode based on the identification result of the discharge lamp identification means. A preheating current is supplied to the filament preheating means so that an optimum preheating corresponding to the discharge lamp is obtained and the preheating time is substantially constant regardless of the discharge lamp.

According to a seventeenth aspect of the present invention, in the configuration according to any one of the first to sixteenth aspects, the control circuit performs the identification at the time of full lighting based on the identification result of the discharge lamp identification means. And controlling at least one of the operating frequency of the switching element, the duty ratio, and the output voltage of the DC power supply circuit so that the rated lamp power according to the discharge lamp is obtained.

According to an eighteenth aspect of the present invention, in the configuration according to any one of the first to sixteenth aspects, the control circuit performs the identification at the time of full lighting based on the identification result of the discharge lamp identification means. Operating frequency of the switching element so that the lamp power becomes substantially constant irrespective of the discharge lamp.
It controls at least one of a duty ratio and an output voltage of the DC power supply circuit.

According to a nineteenth aspect of the present invention, in the configuration according to any one of the first to sixteenth aspects, the control circuit performs the identification at the time of full lighting based on the identification result of the discharge lamp identification means. Operating frequency of the switching element so that the lamp current becomes substantially constant irrespective of the discharge lamp.
It controls at least one of a duty ratio and an output voltage of the DC power supply circuit.

According to a twentieth aspect of the present invention, in the configuration according to any one of the first to sixteenth aspects, the control circuit performs the identification at the time of full lighting based on the identification result of the discharge lamp identification means. At least one of the operating frequency of the switching element, the duty ratio, and the output voltage of the DC power supply circuit is controlled so that the light output is substantially constant irrespective of the discharge lamp.

According to a twenty-first aspect of the present invention, in the configuration according to any one of the first to fifteenth aspects, the control circuit performs the identification at the time of full lighting based on the identification result of the discharge lamp identification means. This control is performed so that a filament current most suitable for the discharge lamp flows.

According to a twenty-second aspect of the present invention, in the configuration according to any one of the first to thirteenth aspects, the control circuit determines whether the discharge lamp is an argon gas lamp based on the identification result of the discharge lamp identification means. In this case, control is performed so that a DC component is not superimposed on the lamp voltage, and when the discharge lamp is a mixed gas lamp, control is performed such that a DC component is superimposed on the lamp voltage.

According to a twenty-third aspect of the present invention, in the configuration according to the twenty-second aspect, when the discharge lamp is an argon gas lamp, the control for preventing a DC component from being superimposed on the lamp voltage is performed by controlling a switching element of the inverter circuit. The control is such that the on / off duty ratio is approximately 50%, and the control for superimposing a DC component on the lamp voltage when the discharge lamp is a mixed gas lamp is as follows:
The control is such that the on / off duty ratio of the switching element of the inverter circuit is unbalanced.

According to a twenty-fourth aspect of the present invention, in the configuration according to the twenty-second aspect, when the discharge lamp is an argon gas lamp, the control for preventing a DC component from being superimposed on the lamp voltage is performed by controlling a switching element of the inverter circuit. In the case where the discharge lamp is a mixed gas lamp, the control for superimposing a DC component on the lamp voltage is the on / off duty ratio control of the switching element of the inverter circuit.

According to a twenty-fifth aspect of the present invention, there is provided a lighting apparatus characterized in that a plurality of the single-lamp discharge lamp lighting devices according to any one of the first to twenty-fourth aspects are combined to be used for a multi-lamp. I do.

[0033]

Embodiments of the present invention will be described below in detail with reference to the drawings. [First Embodiment] FIG. 1 is a block diagram showing a configuration of a discharge lamp lighting device according to a first embodiment. In the discharge lamp lighting device DLA according to the first embodiment, a full-wave rectifier DB is connected to the commercial power supply VS, and a DC power supply circuit CV including a boost chopper circuit is connected to the full-wave rectifier DB. A power supply unit is configured. Also,
The DC power supply circuit CV is connected to an inverter circuit INV that converts a DC voltage into a high-frequency AC voltage by turning on / off the switching element Q and supplies high-frequency power to the discharge lamp LA. The inverter circuit INV is provided with a control circuit CC for controlling ON / OFF of the switching element Q, while an output side of the inverter circuit INV is connected to an inverter load circuit IL including a discharge lamp LA. Further, the discharge lamp LA is provided with a filament preheating means FPH for supplying a preheating current to the filament and preheating the filament before the discharge lamp LA is turned on.

Further, in the first embodiment, the discharge lamp L
In order to identify the type of A, a filament electrical characteristic detecting means FCD, an input characteristic detecting means ICD, an output characteristic detecting means OCD, an operating frequency detecting means FD, a DC power supply voltage detecting means DD, and a switching current detecting means CT are provided. ing. The input characteristic detecting means ICD and the output characteristic detecting means OCD correspond to the after-lighting electric characteristic detecting means in the claims. The discharge lamp lighting detection means DLD is for detecting whether or not the discharge lamp LA is turned on in the start mode.

In addition to the above configuration, in the first embodiment, the filament electric characteristic detecting means FCD, input characteristic detecting means ICD, output characteristic detecting means OCD, operating frequency detecting means FD, DC power supply voltage detecting means DD, Discharge lamp identification means D for identifying the type of discharge lamp LA based on the detection results of at least two of the switching current detection means CT and sending the result to the control circuit CC
A CM is provided.

Further, there are provided a discharge lamp type storage means MR for storing the identification result of the discharge lamp identification means DCM, and an ambient temperature correction means TC having a temperature sensing element for detecting the ambient temperature of the discharge lamp LA. . The reference value for identifying the type of each discharge lamp LA is stored in advance in the discharge lamp identification means DCM with respect to the detection output obtained by each of the above detection means.

The above-described control circuit CC applies a high voltage to the discharge lamp LA in a preheating mode for warming the filament of the discharge lamp LA and facilitating scattering of the emitter after the power is turned on and before the discharge lamp LA is turned on. Then, the control sequentially shifts to three modes of a starting mode for lighting the discharge lamp LA and a lighting mode for stably lighting the discharge lamp LA with a predetermined output. Further, the control circuit CC includes the discharge lamp identifying means DCM.
Based on the identification result, appropriate control according to the characteristics of the discharge lamp LA as described later is performed.

In the preceding stage of the preheating mode, the filament electric characteristic detecting means FCD is used. In the starting mode, the input characteristic detecting means ICD, the output characteristic detecting means OCD,
Operating frequency detecting means FD and DC power supply voltage detecting means D
When any of D is in the lighting mode, the switching current detection means CT is used. Here, the filament electric characteristic detecting means FCD detects a difference in electric characteristics of the filament within the period when a small current is applied to the filament of the discharge lamp LA for a certain period before the preheating mode by the control circuit CC. Is what you do.

FIG. 2 is a specific circuit diagram showing an example in which a filament electric characteristic detecting means FCD is provided for the inverter load circuit IL. In FIG. 2, a filament electrical characteristic detecting means FCD converts a current generated at both ends of the filament of the discharge lamp LA into a voltage and detects the magnitude of the voltage, and a step-up insulating transformer T connected to the filament. A diode D for rectifying the current flowing through the secondary coil of the transformer T,
A DC voltage conversion capacitor C6 charged through
And resistors R1 and R2 for voltage division.

In the first embodiment, the input characteristic detecting means ICD detects an input current from the commercial AC power supply VS to the full-wave rectifier DV immediately after the discharge lamp LA is turned on in the start mode. The input characteristic detecting means IC
D may detect the input power instead of the input current. Further, in the first embodiment, the input characteristic detecting means ICD is provided before the full-wave rectifier DB, but may be provided after the full-wave rectifier DB.

In the first embodiment, the output characteristic detecting means OCD detects the lamp voltage immediately after the discharge lamp LA is turned on in the starting mode. The output characteristic detecting means OCD may detect the lamp current or the lamp power instead of the lamp voltage. The operating frequency detecting means FD detects the operating frequency of the inverter circuit INV in response to the detection output when the lighting of the discharge lamp LA is detected by the discharge lamp lighting detecting means DLD. The DC power supply voltage detection means DD detects the DC power supply voltage of the DC power supply circuit CV in response to the detection output when the discharge lamp lighting detection means DLD detects the lighting of the discharge lamp LA.

The switching current detecting means CT detects a current flowing through the switching element Q of the inverter circuit INV in the lighting mode.
It is composed of a current transformer as shown in (1). That is, in the current transformer CT, the primary winding n1 is connected to the switching element Q (Q
1, Q2), and the secondary winding n2 is connected to the discharge lamp identification means DCM. When the switching current detecting means CT is used, the discharge lamp identifying means DCM identifies the type of the discharge lamp based on the phase difference of the switching current detected by the switching current detecting means CT with respect to the high frequency voltage. .

The ambient temperature compensating means TC includes a discharge lamp L
This is for correcting variations in characteristics due to the ambient temperature of A. That is, the electrical characteristics of the discharge lamp LA, such as the input / output characteristics at the time of lighting and the minimum starting voltage of the discharge lamp LA, vary greatly depending on the ambient temperature. Therefore, when the discharge lamp identification means DCM identifies the type of the discharge lamp LA based on the detection output of each of the above detection means, the discharge lamp identification means DCM determines the ambient temperature detected by the temperature sensing element incorporated in the ambient temperature correction means TC. Accordingly, the influence of temperature is corrected by multiplying the detection output of each detection means by a certain correction coefficient.

Further, the discharge lamp type storage means TC is provided for the following reason. The filament electric characteristic detecting means FCD checks the electric characteristics of the filament of the discharge lamp LA before shifting to the preheating mode in order to identify the type of the discharge lamp LA.
A can be controlled, but other detection means ICD,
Since the OCD, FD, DD, and CT are operated after shifting to the start mode or the lighting mode, it is difficult to appropriately control the discharge lamp LA in the preheating mode. On the other hand, if the discharge lamp type storage means TC is provided, the discharge lamp L
Since the type of the discharge lamp LA can be stored from the time when the type of A is identified to the time when the next power is turned on, even if the identification result based on the detection output of the filament electrical characteristic detecting means FCD alone is not sufficient, the discharge can be performed. Since the type of the discharge lamp LA can be further identified based on the information stored in the lamp type storage means TC, it is possible to control the discharge lamp LA in the preheating mode after the power is turned on again.

Next, the operation in the case where the discharge lamp identifying means DCM identifies the type of the discharge lamp LA based on the detection output of each detecting means will be described. In addition, the discharge lamp identification unit DCM identifies the type of the discharge lamp LA based on the detection results of the plurality of detection units, thereby improving the accuracy of the identification result as compared with the case where identification is performed based on the detection output of a single detection unit. Is increasing.

As shown in FIG. 4, after turning on the power, the control circuit CC increases the oscillation frequency at a predetermined timing so as to shift to the preheating mode, the starting mode, and the lighting mode before the discharge lamp LA is turned on. F1 → f2 → f3
Control is performed so as to switch to (f1>f2> f3).

FIG. 5 is a characteristic diagram showing a resonance curve of the inverter load circuit IL in the discharge lamp lighting device DLA when the oscillation frequency is switched according to each mode as described above. FIG. 5 shows a resonance curve S1 (resonance frequency f0) before the discharge lamp LA is turned on and a resonance curve S2 after the discharge lamp LA is turned on.

When the power is turned on, the preheating mode is started first. At this time, since the discharge lamp LA is not lit, it is at the point (frequency f1, lamp voltage V1) of the resonance curve S1 before lighting, and the filament of the discharge lamp LA is warmed by the preheating current supplied by the filament preheating means FPH. Next, when the mode changes from the preheating mode to the starting mode,
First, the operation shifts to a point (frequency f2, lamp voltage V2) along the resonance curve of S1, and the oscillation voltage rises at a stretch.
Then, when an oscillation voltage equal to or higher than the minimum starting voltage of the discharge lamp LA is applied to the discharge lamp LA, the discharge lamp LA is turned on. After the discharge lamp LA is turned on, the resonance curve S after the lighting of the resonance system is turned on.
2, the value falls to the value of the resonance curve S2 (frequency f2, lamp voltage V3). Thereafter, when the operation mode shifts to the lighting mode, the lamp voltage moves to a point (frequency f3, lamp voltage V4) along the resonance curve S2, and operates at a predetermined lighting frequency f3 determined by this design.

Here, when the filament electric characteristic detecting means FCD is used to identify the type of the discharge lamp LA, the control circuit CC controls the switching element Q of the inverter circuit INV before shifting to the preheating mode. FIG.
At the operating frequency fs (> f1) shown in FIG. At this time, the filament electrical characteristic detecting means FCD detects the current flowing through the filament of the discharge lamp LA by the transformer CT, and converts the current into a DC voltage by the capacitor C6 on the secondary side of the transformer CT.

Here, when a discharge lamp LA having a different filament resistance value is mounted, the potential level appearing at the capacitor C6 differs depending on the filament resistance value. Therefore, the discharge lamp identification means DCM identifies the type of the discharge lamp LA by comparing the detected potential level with a reference potential set in advance according to the type of the discharge lamp LA. When the type of the discharge lamp LA is identified in the starting mode, any one of the input characteristic detecting means ICD, the output characteristic detecting means OCD, the operating frequency detecting means FD, and the DC power supply voltage detecting means DD is used. You. The input characteristic detecting means ICD detects an input characteristic immediately after the discharge lamp LA is turned on in the starting mode. Discharge lamp identification means D
The CM identifies the type of the discharge lamp LA based on the detected value of the input characteristic (here, the value of the input current). That is, the value of the input characteristic immediately after the discharge lamp LA is turned on in the start mode differs depending on the type of the discharge lamp LA. Therefore, the type of the discharge lamp LA is identified from the value of the input characteristic. The output characteristic detecting means OCD detects the lamp voltage immediately after the discharge lamp LA is turned on in the starting mode.

FIG. 6 is a timing chart showing the change over time of the lamp voltage and the oscillation frequency when sequentially shifting to the preheating, starting and lighting modes as described above.
Here, when the power is turned on, as shown in FIG. 6B, the discharge lamp lighting device DLA sequentially switches the oscillation frequency at a predetermined timing from f1 to f2 to f3 (f1>f2> f3). However, since the discharge lamp LA is not lit at first at the time of starting, the resonance system is in a state where there is no load (resonance curve of S1 in FIG. 5). Therefore, the discharge lamp LA
Is applied with a high voltage (time t1 to t2). Immediately after the discharge lamp LA is turned on (time t2), the resonance system becomes the resonance system under load (the resonance curve of S2 in FIG. 5), and the lamp voltage decreases. The value of the lamp voltage (the point of the resonance curve S2 in FIG. 5) immediately after the discharge lamp LA is turned on at the time of the start differs depending on the type of the discharge lamp. Thus, utilizing the fact that the lamp voltage differs depending on the type of the discharge lamp LA, the discharge lamp identification means DCM identifies the type of the discharge lamp LA based on the lamp voltage detected by the lamp voltage detection unit LVD.

When the lighting of the discharge lamp LA is detected by the discharge lamp lighting detecting means DLD, the operating frequency detecting means FD detects the operating frequency of the inverter circuit INV in response to this detection output. That is, the minimum starting voltage required for lighting the discharge lamp LA differs depending on the type of the discharge lamp LA. That is, as shown in FIG.
Aa is turned on when the frequency is fa and at the minimum starting voltage Va, and the frequency is f
Lights when the minimum starting voltage Vb is at b. From a different point of view, this means that the operating frequency differs depending on the type of the discharge lamp.

Therefore, the control circuit CC starts the operation frequency of the inverter circuit INV from a high place at the start, and then gradually lowers the operation frequency to start the discharge lamp LV.
The discharge lamp lighting detection means DLD detects the moment when A is turned on, and the operating frequency detecting means FD detects the operating frequency of the inverter circuit INV in response to the detection output. The discharge lamp identification means DCM outputs the discharge lamp LA based on the value of the operating frequency detected by the discharge lamp lighting detection means DLD.
Identify the type.

When the lighting of the discharge lamp LA is detected by the discharge lamp lighting detecting means DLD, the DC power supply voltage detecting means DD detects the DC power supply voltage of the DC power supply circuit CV in response to the detection output. As described above, generally, the minimum starting voltage required for lighting the discharge lamp LA differs depending on the type of the discharge lamp LA (see FIG. 7).

FIG. 8 shows the DC power supply voltage output of the DC power supply circuit CV on the horizontal axis and the lamp voltage on the vertical axis, and the two discharge lamps LAa, La when the DC power supply voltage is gradually increased.
The relationship between the minimum starting voltages Va and Vb at the time of lighting of Ab is shown. As can be seen from FIG. 8, one discharge lamp LAa is turned on when the DC power supply voltage is VDCa and the minimum starting voltage is Va (point a1), and the other discharge lamp LAb is Lights when the power supply voltage becomes VDCb and the minimum starting voltage is Vb (point b1). That is, from a different point of view, this means that the value of the DC power supply voltage at the time of lighting in the starting mode differs depending on the type of the discharge lamp. Therefore, after the start, the control circuit CC gradually increases the value of the DC power supply voltage which is the output of the DC power supply circuit CV. When the discharge lamp lighting detection means DLD detects that the discharge lamp LA has been turned on, the DC power supply voltage detection means DD responds to the detection output and outputs the DC power supply circuit CV at the moment when the discharge lamp LA is turned on. Read the value of the output voltage.
Subsequently, the discharge lamp identifying unit DCM identifies the type of the discharge lamp LA based on the detected output voltage value.

The switching current detecting means CT detects a current flowing through the switching element Q of the inverter circuit INV in the lighting mode. That is, in the lighting mode, when the control circuit CC switches the switching element Q at the predetermined frequency f3, the switching current flowing through the switching element Q is detected by the switching current detection means CT. Then, the detection output is given to the discharge lamp identification means DCM.

FIG. 9 is a diagram showing signal waveforms of various parts generated when the inverter circuit INV has two switching elements Q1 and Q2 and the control circuit CC switches these switching elements Q1 and Q2. here,
6A and 6B show high-frequency voltages VDSQ1 and VDSQ2 applied to switching elements Q1 and Q2, and FIGS. 6C and 6D show discharge lamps LA of different types (here, FHF32 lamp and FLR40S). (2 types of / 36 lamps) shows a switching current waveform IDSQ2 flowing through the switching element Q2.

As can be seen from FIGS. 9C and 9D, F
The switching current when the HF32 lamp is lit is FL
Higher frequency voltage VDSQ than at R40S / 36 lamp lighting
2, the phase difference is small, and therefore, the peak value of the regenerative current (I
s) is small and the regenerative current peak value (Is)
From the regenerative current to the zero-cross point of the regenerative current (T
s) is also shorter. The reason is that the discharge impedance of the FHF32 lamp is larger than that of the FLR40S / 36 lamp, and therefore the resonance system at the time of lighting is the discharge lamp LA.
This is to approach the resonance system at the time of no load without mounting.

As described above, the peak value (Is) of the regenerative current or the regenerative current period (T) depends on the type of the discharge lamp LA.
s), the discharge lamp identification means DCM sets the reference value of the regenerative current peak value (Is) or the regenerative current period (Ts) stored in advance in accordance with the type of the discharge lamp LA as the switching current. The type of the discharge lamp LA is identified by comparing with the detection output of the detection means CT. As described above, the filament electric characteristic detecting means FCD, the input characteristic detecting means ICD, the output characteristic detecting means OCD, the operating frequency detecting means FD, the DC power supply voltage detecting means DD, and the switching current detecting means CT output the discharge lamp LA. Since a detection output corresponding to the type is obtained, the discharge lamp identification unit DCM identifies the type of the discharge lamp LA based on the detection results of the plurality of detection units among the above detection units. That is, if the identification result based on the detection output of each detecting means is the same, the type of the discharge lamp LA is determined. If the two identification results are different, the type of the discharge lamp LA is identified based on the detection output of another detection unit. If at least two identification results match, the type of the discharge lamp LA is determined. Thereby, the reliability is improved as compared with the case where the type of the discharge lamp LA is identified based on the detection output of the single detection unit.

[Second Embodiment] The structure of a discharge lamp lighting device according to a second embodiment is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This Embodiment 2
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

The discharge lamp lighting device DLA according to the second embodiment
Is a discharge lamp type storage unit M for storing the type of the discharge lamp LA.
R, and a filament electrical characteristic detecting means FCD for oscillating the filament minutely before the preheating mode to check the electrical characteristics of the filament is provided, so that control in the preheating mode after turning on the power becomes possible. Become. Therefore,
Here, the discharge lamp LA performed by the control circuit CC in the preheating mode after the type of the discharge lamp LA is identified.
Will be described.

Generally, the preheating depends on the preheating current and the preheating time given to the discharge lamp LA. For example, as shown in FIG. 10, three different types of discharge lamps LAa, LAa,
For LAb and LAc, the preheating current is set to a constant value, for example, I
b, the discharge lamps LAa, LAb, LA
c, each preheating time is defined as ta, tb, tc (ta <
tb <tc), and the difference in the preheating time increases depending on the type of the discharge lamp LA. That is, since there is a large difference in the time from when the power is turned on to when the discharge lamp LA is turned on, the user feels strange. On the other hand, after the type of the discharge lamp LA is identified, the magnitude of the preheating current for each of the discharge lamps LAa, LAb, LAc is set to Ia, Ib, Ic (Ia, respectively) so that the preheating time becomes substantially constant t1. <Ib
If it is changed to <Ic), there is no longer a time difference from when the power is turned on until the discharge lamp LA is turned on, and the sense of incongruity caused by the time difference until the lighting as in the related art is eliminated.

A specific method for changing the preheating current according to the type of the discharge lamp LA is, for example, as shown in FIG. 11, by changing the operating frequency at the time of preheating to the discharge lamps LAa, LAb, and LAb.
In accordance with the type of LAc, fa, fb, fc (fa
>Fb> fc). Therefore, the control circuit CC switches the switching element Q of the inverter circuit INV based on the identification result of the discharge lamp identification means DCM.
To control the operating frequency. Thereby, when a plurality of different types of discharge lamps are shared by one type of discharge lamp lighting device, the type of the discharge lamp LA can be identified before the preheating, and the identified discharge lamp L can be identified.
Optimum preheating is provided according to the type of A. Therefore, the life of the discharge lamp LA can be improved, and the lamp can be lit without a sense of incongruity.

[Third Embodiment] The structure of a discharge lamp lighting device according to a third embodiment is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This Embodiment 3
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

FIG. 12 shows a resonance curve of a lighting resonance circuit when a plurality of different types of discharge lamps (here, three lamps) LAa to LAc are mounted. As can be seen from FIG. 12, in a general lighting resonance circuit, a plurality of different types of discharge lamps LAa
To LAc at the same frequency f3, the discharge lamp L
Since the ratings differ depending on Aa to LAc,
Depending on the type of the discharge lamps LAa to LAc, such as “bright” or “dark”, the output powers Wa to Wc
The difference occurs.

Therefore, the control circuit CC determines, based on the identification result of the discharge lamp LA identified by the discharge lamp identification means DCM,
Constant power control is performed to change the operating frequency of the inverter circuit INV according to the output characteristics of the discharge lamp LA so that constant lamp power is always obtained without being affected by the type of the discharge lamp LA. Thereby, one discharge lamp lighting device D
A plurality of different types of discharge lamps LA can be turned on with the same power using the LA. As means for changing the output power of the discharge lamp LA, in addition to changing the operating frequency as described above, changing the duty ratio of the switching element of the inverter circuit INV or changing the DC voltage value of the DC power supply circuit CV It is also possible.

[Fourth Embodiment] The structure of a discharge lamp lighting device according to a fourth embodiment is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This Embodiment 4
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

As described above, in a general lighting resonance circuit, when a plurality of different types of discharge lamps LA are operated at the same frequency, an output difference may occur between the discharge lamps LA. Therefore, the control circuit CC changes the output of the discharge lamp LA so that the output matches the rating of each discharge lamp LA based on the identification result of the discharge lamp LA identified by the discharge lamp identification means DCM. Performs output control. This allows
A single discharge lamp lighting device DLA can light a plurality of different types of discharge lamps LA at the rated power. The discharge lamp LA
Means for changing the output of the inverter circuit IN
In addition to changing the operating frequency of V, it is also possible to change the duty ratio of the switching element or change the DC voltage value of the DC power supply circuit CV.

[Fifth Embodiment] The structure of a discharge lamp lighting device according to a fifth embodiment is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This Embodiment 5
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

The identification result of the discharge lamp identification means DCM is given to the control circuit CC.
The following control is performed. As described above, in a general lighting resonance circuit, when a plurality of different types of discharge lamps LA are operated at the same frequency, a difference in light output occurs between the discharge lamps LA. For this reason, the control circuit CC controls the discharge lamp identifying means DCM.
The constant light output control is performed on the basis of the identification result of the discharge lamp LA identified by the above so that the light output is always constant without being affected by the type of the discharge lamp LA. Thereby, a plurality of different types of discharge lamps LA can be lit with a constant light output by one discharge lamp lighting device DLA, and the problem of uneven light output depending on the type of discharge lamp LA can be solved. As means for changing the output of the discharge lamp LA, in addition to changing the operating frequency of the inverter circuit INV, it is also possible to change the duty ratio of the switching element or change the DC voltage value of the DC power supply circuit CV. It is.

[Sixth Embodiment] The structure of a discharge lamp lighting device according to a sixth embodiment is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This Embodiment 6
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

As control after the type of the discharge lamp is identified,
Twin 3 lamps (FHT24, FHT32, FHT4
As for the discharge lamps having the same lamp current but different lamp voltages as in 2), the rated power control can be performed not by the rated power control but also by the control for keeping the lamp current constant. Therefore, in the sixth embodiment, the discharge lamp identifying means DCM
After the type of the discharge lamp is identified, the rated lamp current control for changing the output so that the lamp current becomes constant is performed. By employing such a means, a plurality of different kinds of lamps can be lighted at the rated power of each lamp by one discharge lamp lighting device.

[Seventh Embodiment] The structure of a discharge lamp lighting device according to a seventh embodiment is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This Embodiment 7
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

Generally, in order to satisfy the rated life of the discharge lamp LA, it is necessary to supply a lamp current and a filament current so that the filament always has an optimum spot temperature. Since the filament temperature at the time of lighting of the discharge lamp LA is determined by the combined current of the lamp current and the filament current, when the lamp is lit and lit, the lamp current decreases. Therefore, it is necessary to increase the filament current to compensate for the decrease. is there. Since the structure of the filament changes depending on the type of the discharge lamp LA, the magnitude of the filament current also differs depending on the type of the discharge lamp LA, and has an optimum value. Therefore, it is desirable to control the filament current according to the type of each discharge lamp LA.

Therefore, in the seventh embodiment, after the type of the discharge lamp LA is identified by the discharge lamp identification means DCM, the control circuit CC separately provides a means capable of changing the filament current based on the identification result. Control so that a filament current suitable for the dimming characteristics of each discharge lamp LA flows.
Thereby, a plurality of different kinds of discharge lamps LA can be lit with a constant light output by one discharge lamp lighting device DLA without impairing the life of the discharge lamps LA. At the time of full lighting, a function of interrupting the flow of the filament current may be added regardless of the type of the discharge lamp LA. Since the lamp current is large at the time of full lighting, the filament temperature can be kept relatively high, and the power loss due to the filament current is reduced, which can contribute to energy saving.

[Eighth Embodiment] The configuration of a discharge lamp lighting device according to an eighth embodiment is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This Embodiment 8
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

Generally, in a glow starter type copper iron ballast, a filament current is not always supplied. For this reason, FL
When connecting a glow starter type lamp such as 40, FL40 / 37 to a rapid start type ballast or an inverter ballast, the filament of the lamp is always preheated, so that the evaporation of the emitter increases and the life is shortened. there were. Therefore, in the eighth embodiment, after the type of the discharge lamp LA is identified by the operating frequency detection means FD, the control circuit CC is connected to the discharge lamp LA which does not always require a filament current, such as a glow starter type lamp. If so, control is performed so as to cut off the flow of the filament current after shifting to the lighting mode. Thereby, a plurality of different kinds of lamps having different filament currents can be always used in one discharge lamp lighting device.

[Embodiment 9] The structure of a discharge lamp lighting apparatus according to Embodiment 9 is basically the same as that shown in FIGS. Also, the operation of each detecting means and the discharge lamp identifying means DCM is the same as in the first embodiment,
Here, detailed description is omitted. This embodiment 9
Since the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM is described below, control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

As described above, when the ambient temperature of the discharge lamp LA is low, the cataphoresis phenomenon is likely to occur in the argon gas lamp. In the case of a mixed gas lamp including the gas mixture, a moving fringe phenomenon may occur. As a countermeasure against this, in the case of the cataphoresis phenomenon, it is sufficient that the DC voltage is not included in the lamp voltage of the discharge lamp. %And it is sufficient. On the other hand, in the case of the moving fringe phenomenon, on the other hand, the DC component may be superimposed on the lamp voltage of the discharge lamp,
For that purpose, the duty ratio of the on / off drive of the switching element may be set to be unbalanced, that is, the duty ratio may be out of 50%. Thus, the countermeasures against both phenomena are inconsistent depending on the type of the discharge lamp LA.

Therefore, in the ninth embodiment, the control circuit CC supplies the discharge lamp LA identified by the discharge lamp identification means DCM.
In other words, when the discharge lamp LA is an argon gas lamp, as shown in FIG. 13A, when the inverter circuit INV is composed of, for example, two switching elements Q1 and Q2, the switching element Q1 , Q2, the on / off duty ratio of the driving signals VDSQ1 and VDSQ2 is set to approximately 50% so that no DC component is included. When the discharge lamp LA is a mixed gas lamp, as shown in FIG. 13B, drive signals VDSQ1, VDS of the switching elements Q1, Q2 of the inverter circuit INV.
The on / off duty ratio of Q2 is controlled so as to be unbalanced (duty ratio deviates from 50%) so that a DC component is superimposed on the lamp voltage.
Thereby, without being affected by the difference in the gas enclosed in the tube of the discharge lamp LA mounted on the discharge lamp lighting device DLA,
Both of the above two phenomena can be avoided at low temperatures.

[Embodiment 10] In Embodiment 9 described above, in order to prevent the cataphoresis phenomenon in the argon gas lamp and the moving fringe phenomenon in the mixed gas lamp from occurring at a low temperature, the on / off of the switching element is controlled. Although the duty ratio is controlled, even if the duty ratio is not particularly controlled, the DC component is not included in the argon gas lamp, and the DC component is superimposed on the mixed gas lamp. It is also possible to do so. FIG. 14 shows a specific configuration for that purpose.

In the tenth embodiment, in the inverter load circuit IL, the switch SW is connected to both ends of the DC blocking capacitor C2, and the ON / OFF operation of the switch SW is controlled by the control circuit CC. ing. The other configuration of the discharge lamp lighting device of the tenth embodiment is basically the same as that shown in FIGS. In addition, each detection means and discharge lamp identification means DCM
Is also the same as in the first embodiment, and a detailed description is omitted here.

Now, it is assumed that the inverter circuit INV operates in an unbalanced on / off duty ratio of the switching elements Q1 and Q2. At this time, when the identified discharge lamp LA is an argon gas lamp, the control circuit CC turns off the switch SW. Then, even if the on / off duty ratio of the switching elements Q1 and Q2 is in an unbalanced state, the DC component is blocked by the capacitor C2, so that the DC component is not superimposed on the lamp voltage. On the other hand, in the case of a mixed gas lamp, the switch SW
Is turned on, the on / off of the switching elements Q1 and Q2
Since the off duty ratio is unbalanced,
A DC component is superimposed on the lamp voltage. As a result, similarly to the case of the duty ratio control, it is possible to avoid a problem at a low temperature with respect to the discharge lamps having different gas filling in the tube.

[Eleventh Embodiment] The structure of a discharge lamp lighting device according to an eleventh embodiment is basically the same as that shown in FIGS. Further, the operations of the respective detecting means and the discharge lamp identifying means DCM are the same as those in the first embodiment, so that the detailed description is omitted here. Embodiment 1
1 is the control content of the control circuit CC as a result of identifying the type of the discharge lamp LA by the discharge lamp identification means DCM.
Control after the type of the discharge lamp LA is identified by the control circuit CC will be described.

As a control method after the discharge lamp LA is turned on, there is dimming lighting. As a control method of this dimming lighting,
(1) controlling the driving frequency of the switching element of the inverter circuit; (2) controlling the on / off duty ratio of the switching element of the inverter circuit; and (3) controlling the output voltage of the DC power supply circuit. is there. Also,
In such dimming lighting, since the power consumed by the discharge lamp is low, the tube wall temperature is also lower than in full lighting. This means that the mercury vapor pressure in the tube tends to decrease, so that the above-mentioned cataphoresis phenomenon and moving stripe phenomenon easily occur. Therefore, when performing dimming lighting, it is necessary to adopt a control method corresponding to the type of each discharge lamp.

For example, when the identified discharge lamp is an argon gas lamp, the inverter circuit IN is used to prevent the cataphoresis phenomenon at low temperatures from occurring as described above.
While maintaining a state in which the on / off duty ratio of the V switching element is maintained at approximately 50% to prevent a DC component from being included in the lamp voltage, the above (1) or (3)
That is, frequency control or DC power supply voltage control is performed (see FIG. 15). If the identified discharge lamp is a mixed gas lamp, the on / off duty ratio of the switching element is unbalanced so that a DC component is superimposed on the lamp voltage (for example, when the duty ratio deviates from 50%). ) Control (see FIG. 16). This makes it possible to avoid any of the above two phenomena at a low temperature for discharge lamps with different gas filling in the tube even during dimming lighting.

[Embodiment 12] FIG. 17 is a perspective view of a two-light Fuji-shaped fixture generally used as a facility lighting fixture, FIG. 18 is a plan view of the same lighting fixture, and FIG. FIG. 4 is a connection diagram illustrating a connection state with a discharge lamp lighting device. The lighting apparatus of the twelfth embodiment has two discharge lamps L
Fuji-shaped frame 1 so that A1 and LA2 can be turned on.
00, a reflection plate 101 is provided, and a pair of sockets 102 are attached to the left and right sides of the reflection plate 101, respectively.

Here, in a lighting device for multiple lamps, when a plurality of different types of discharge lamps are mounted, the output characteristics and preheating conditions are different for each of the discharge lamps. In addition, it is easier to provide a discharge lamp lighting device separately for each discharge lamp. Therefore, the first embodiment
In FIG. 2, as shown in FIG.
A2, each discharge lamp lighting device DLA
1 and DLA2 are provided. In this case, each of the discharge lamp lighting devices DLA1 and DLA2 is provided with each of the above first to third embodiments.
The configuration of the discharge lamp lighting device as shown by 10 is adopted.

Then, these discharge lamp lighting devices DLA
1, DLA2 are mounted in the frame 100, and the input terminals I of the respective discharge lamp lighting devices DLA1, DLA2.
N is a commercial AC power supply VS, and an output terminal OUT
1 and OUT2 are connected to respective discharge lamps LA1 and LA2. Note that 103 is a lamp pin contact hole, and 104 is a spring. Thus, even when a plurality of different types of discharge lamps are used in the lighting equipment at the same time, shared lighting can be performed without any trouble in identifying the discharge lamps. In the twelfth embodiment, a description has been given of a lighting device for two lamps. However, a lighting device for three lamps or further for n (≧ 4) lamps may be used. The discharge lamp lighting device is mounted for a few minutes.

The control after identifying the type of the discharge lamp identifying means DCM and the type of the discharge lamp LA as described in each of the first to twelfth embodiments is limited to each of the first to twelfth embodiments. Not something. As for the discharge lamp identification means DCM, an optimal identification method capable of identifying the type of the discharge lamp LA may be adopted, and the control after identifying the type of the discharge lamp LA is also performed in the above-described first to eleventh embodiments. However, the present invention is not limited to this, and an optimal control method can be adopted according to the situation.

[0091]

According to the present invention, since the type of the discharge lamp is identified based on the identification results of the plurality of discharge lamp identification means, more reliable identification than when a single discharge lamp identification means is used. The result is obtained. For this reason, preheating control and lighting control can be appropriately and accurately performed based on the identification result of the discharge lamp so that conditions suitable for the identified discharge lamp are satisfied. Therefore, while a special discharge lamp lighting device has been used for each shape and each rating of a discharge lamp, a plurality of different types of discharge lamps are used in one type of discharge lamp lighting device. Can be shared, and a highly reliable discharge lamp lighting device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a filament electrical characteristic detecting means of the apparatus.

FIG. 3 is a circuit diagram showing a configuration in which switching current detection means is provided in an inverter circuit of the device.

FIG. 4 is a timing chart showing a change in filament current until a discharge lamp of the device is turned on.

FIG. 5 is a characteristic diagram showing a resonance curve of the inverter load circuit when shifting to each mode of preheating, starting, and lighting in the same device.

FIG. 6 is a timing chart showing a temporal change of a lamp voltage and an oscillating frequency when the apparatus shifts to each mode of preheating, starting, and lighting.

FIG. 7 is a characteristic diagram showing a resonance curve of an inverter load circuit indicating that a minimum starting voltage required for lighting a discharge lamp differs depending on a type of a discharge lamp.

FIG. 8 is a characteristic diagram showing a difference between a minimum starting voltage at the time of lighting and a type of a discharge lamp according to a change in a DC power supply voltage.

FIG. 9 is a waveform diagram of a signal generated when a switching element of the inverter circuit INV is turned on / off.

FIG. 10 is an explanatory diagram showing a relationship between preheating currents for making a preheating time given to a discharge lamp constant when a plurality of different types of discharge lamps are preheated.

FIG. 11 is an explanatory diagram of a method for changing a preheating current according to a type of a discharge lamp.

FIG. 12 is a characteristic diagram showing a difference in output power when different types of discharge lamps are operated at the same frequency.

FIG. 13 is a diagram illustrating a case in which the on / off duty ratio of the switching element of the inverter circuit is changed according to the type of the discharge lamp in order to eliminate a problem at a low temperature of the discharge lamp in the ninth embodiment of the present invention. 6 is a timing chart to be provided.

FIG. 14 is a circuit diagram showing a configuration of a discharge lamp lighting device according to a tenth embodiment of the present invention, in which the presence or absence of superposition of a DC component on the lamp voltage of the discharge lamp can be selected without controlling the duty ratio. It is.

FIG. 15 is a timing chart showing how to control dimming lighting when the discharge lamp is an argon gas lamp in Embodiment 11 of the present invention.

FIG. 16 is a timing chart showing a control method of dimming lighting when the discharge lamp is a mixed gas lamp in Embodiment 11 of the present invention.

FIG. 17 is a perspective view of a two-light Fuji-shaped lighting device according to a twelfth embodiment of the present invention.

FIG. 18 is a plan view of the lighting fixture.

FIG. 19 is a connection diagram showing a connection state between a discharge lamp and a discharge lamp lighting device in the lighting fixture.

[Explanation of symbols]

 DLA discharge lamp lighting device VS AC power supply DV full-wave rectifier CV DC power supply circuit INV inverter circuit IL inverter load circuit CC control circuit LA discharge lamp DCM discharge lamp identification means FPH filament preheating means ICD input characteristic detection means OCD output characteristic detection means FD operation Frequency detection means DD DC power supply voltage detection means FCD filament electric characteristic detection means CT Switching current detection means TC Ambient temperature correction means MR Discharge lamp type storage means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirohiko Nojiri 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. Terms (reference) 3K072 AA00 AB01 AB09 AC11 BA03 BB01 BC01 BC03 CA16 DB03 DB08 DC02 DD00 DE02 DE04 GA02 GB12 HA04 HA10 3K098 CC07 CC60 DD01 DD14 EE18 FF02

Claims (25)

[Claims] 1. A DC power supply circuit for rectifying a commercial AC power supply and converting it to DC, an inverter circuit for turning on / off an output of the DC power supply circuit at a high frequency by a switching element and converting the output to a high frequency power, and an inverter for the inverter An inverter load circuit including a discharge lamp to which high-frequency power is supplied from a circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp, and In a discharge lamp lighting device that sequentially shifts to at least a preheating mode, a start mode, and a lighting mode when lighting a discharge lamp, the control circuit applies a small current to the filament for a predetermined period before the preheating mode. A filament electric characteristic detecting means for detecting a difference in electric characteristic of the filament within a period. And after-lighting electrical characteristic detecting means for detecting the electrical characteristics after the discharge lamp is lit in the start mode, and a discharge lamp identification means for identifying the type of the discharge lamp based on the detection results of the two electrical property detecting means A discharge lamp lighting device, wherein the control circuit performs control suitable for characteristics of the discharge lamp based on the identification result of the discharge lamp identification means. 2. A DC power supply circuit for rectifying a commercial AC power supply and converting it to DC, an inverter circuit for turning on / off an output of the DC power supply circuit at a high frequency by a switching element and converting the output to high frequency power, and an inverter for the inverter An inverter load circuit including a discharge lamp to which high-frequency power is supplied from a circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp; In the discharge lamp lighting device in which at least the preheating mode, the starting mode, and the lighting mode are sequentially shifted when lighting, and the operating frequency of the inverter circuit continuously changes during the starting mode, the control circuit controls the preheating mode. If a minute current is applied to the filament only for a certain period before, Filament electric characteristic detecting means for detecting a difference in electrical characteristics of the filament, a discharge lamp lighting detecting means for detecting that the discharge lamp is turned on in the start mode, and a lighting time based on a detection output of the discharge lamp lighting detecting means. Operating frequency detecting means for detecting an operating frequency of the inverter circuit, and a discharge lamp identifying means for identifying the type of discharge lamp based on the detection output of both the detecting means, the control circuit,
A discharge lamp lighting device that performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means. 3. A DC power supply circuit for rectifying a commercial AC power supply and converting it to DC, an inverter circuit for turning on / off an output of the DC power supply circuit at high frequency by a switching element and converting the output to high frequency power, and an inverter for the inverter An inverter load circuit including a discharge lamp to which high-frequency power is supplied from a circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp; At least a preheating mode, a starting mode, and a lighting mode when sequentially lighting, and a discharge lamp lighting device in which the DC power supply voltage of the DC power supply circuit changes continuously during the startup mode, wherein the control circuit preheats the If a small current is applied to the filament for a certain period before the mode, the filament will Filament electric characteristic detecting means for detecting a difference in electrical characteristics of the filament, discharge lamp lighting detecting means for detecting that the discharge lamp is lit during the start-up mode, and a lighting time based on the detection output of the discharge lamp lighting detecting means. DC power supply voltage detection means for detecting the DC power supply voltage of the DC power supply circuit, and discharge lamp identification means for identifying the type of discharge lamp based on the detection output of the filament electrical characteristic detection means and the DC power supply voltage detection means. A discharge lamp lighting device, wherein the control circuit performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means. A switching current detecting means for detecting a current flowing through the switching element; and a discharge lamp for identifying a type of the discharge lamp based on a phase difference of the switching current detected by the switching current detecting means with respect to the high frequency voltage. The discharge lamp lighting device according to claim 1, further comprising an identification unit. 5. A DC power supply circuit for rectifying a commercial AC power supply and converting it to DC, an inverter circuit for turning on / off an output of the DC power supply circuit at high frequency by a switching element to convert the output to high frequency power, and an inverter for the inverter. An inverter load circuit including a discharge lamp to which high-frequency power is supplied from a circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp; In the discharge lamp lighting device that sequentially shifts to at least a preheating mode, a starting mode, and a lighting mode when lighting is performed, the control circuit applies a small current to the filament for a certain period before the preheating mode during the period. A filament electrical property detecting means for detecting a difference in electrical properties of the filament, A switching current detecting means for detecting a current flowing through the switching element, a phase difference of the switching current detected by the switching current detecting means with respect to the high-frequency voltage, and a detection output of the filament electric characteristic detecting means, A discharge lamp lighting device, comprising: discharge lamp identification means for identifying a type; wherein the control circuit performs control suitable for characteristics of the discharge lamp based on the identification result of the discharge lamp identification means. 6. A DC power supply circuit for rectifying a commercial AC power supply and converting it to DC, an inverter circuit for turning on / off an output of the DC power supply circuit at a high frequency by a switching element to convert the output to a high frequency power, and an inverter for the inverter An inverter load circuit including a discharge lamp to which high-frequency power is supplied from a circuit, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp; At least a preheating mode, a starting mode, and a discharge lamp lighting device that sequentially shifts to a lighting mode when lighting the light emitting device, wherein after-lighting electric characteristic detecting means for detecting electric characteristics after the discharge lamp is lit in the starting mode, Switching current detecting means for detecting a current flowing through the switching element; A discharge lamp identification unit that identifies a type of the discharge lamp based on a phase difference of the switching current detected by the current detection unit with respect to the high-frequency voltage, and a detection output of the after-lighting electrical characteristic detection unit. A discharge lamp lighting device which performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means. 7. A DC power supply circuit for rectifying a commercial power supply and converting it to DC, an inverter circuit for turning on / off the output of the DC power supply circuit at a high frequency by a switching element and converting the output to high frequency power, An inverter load circuit including a discharge lamp to which high frequency power is supplied, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp, and lighting the discharge lamp. In the discharge lamp lighting device, which sequentially shifts at least to the preheating mode, the start mode, and the lighting mode when the operation is performed, and the operating frequency of the inverter circuit continuously changes in the start mode, the discharge lamp is lit in the start mode. Lamp lighting detecting means for detecting the discharge lamp, and a point based on the detection output of the discharge lamp lighting detecting means. Operating frequency detecting means for detecting the operating frequency of the inverter circuit at the time, and the switching current detecting means for detecting a current flowing through the switching element,
A discharge lamp identification unit that determines a type of the discharge lamp based on a phase difference of the switching current detected by the switching current detection unit with respect to the high-frequency voltage, and a detection output of the operating frequency detection unit. A discharge lamp lighting device which performs control suitable for the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means. 8. A DC power supply circuit for rectifying a commercial power supply and converting it to DC, an inverter circuit for turning on / off the output of the DC power supply circuit at a high frequency by a switching element and converting the output to high frequency power, An inverter load circuit including a discharge lamp to which high frequency power is supplied, a control circuit for driving and controlling a switching element of the inverter circuit, and a filament preheating means for preheating a filament of the discharge lamp, and lighting the discharge lamp. In the discharge lamp lighting device in which at least the preheating mode, the starting mode, and the lighting mode are sequentially shifted when the starting is performed, and the DC power supply voltage of the DC power supply circuit continuously changes in the starting mode, the discharge lamp is operated in the starting mode. Discharge lamp lighting detecting means for detecting that the lamp has been lit, and based on a detection output of the discharge lamp lighting detecting means. DC power supply voltage detection means for detecting a power supply voltage of the DC power supply circuit at the time of lighting, switching current detection means for detecting a current flowing through the switching element, and the high-frequency voltage of the switching current detected by the switching current detection means Discharge lamp identification means for identifying the type of discharge lamp based on the phase difference with respect to the DC power supply voltage and the detection output of the DC power supply voltage detection means, and the control circuit determines the characteristics of the discharge lamp based on the identification result of the discharge lamp identification means. A discharge lamp lighting device characterized by performing control suitable for a discharge lamp. 9. The discharge lamp lighting device according to claim 1, wherein the after-lighting electrical characteristic detecting means detects a lamp voltage applied to both ends of the discharge lamp. 10. The post-lighting electric characteristic detecting means detects a lamp current flowing through a discharge lamp.
The discharge lamp lighting device according to claim 4. 11. The post-lighting electric characteristic detecting means detects a lamp power obtained from a lamp voltage applied to both ends of the discharge lamp and a lamp current flowing through the discharge lamp. The discharge lamp lighting device according to any one of the above. 12. The discharge lamp lighting device according to claim 1, wherein the after-lighting electrical characteristic detecting means detects an input current supplied from the AC power supply. . 13. The discharge lamp lighting device according to claim 1, wherein the after-lighting electrical characteristic detecting means detects an input power supplied from the AC power supply. . 14. The control circuit according to claim 1, wherein the control circuit drives and controls a switching element of the inverter circuit according to characteristics of the discharge lamp based on a result of the identification by the discharge lamp identification means. A discharge lamp lighting device according to any one of the above. 15. The DC power supply circuit is configured to control a DC output voltage, and the control circuit changes a DC output voltage of the DC power supply circuit of the discharge lamp based on an identification result of the discharge lamp identification means. 14. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is controlled according to characteristics. 16. The control circuit, in a preheating mode, obtains an optimum preheating according to the identified discharge lamp based on the identification result of the discharge lamp identification means, and the preheating time is independent of the discharge lamp. 2. A preheating current is supplied to said filament preheating means so as to be substantially constant.
The discharge lamp lighting device according to claim 15. 17. The operating frequency and the duty ratio of a switching element based on an identification result of the discharge lamp identification means so that a rated lamp power according to the identified discharge lamp is obtained at the time of full lighting. 17. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device controls at least one of an output voltage of the DC power supply circuit. 18. The control circuit according to claim 16, wherein the control circuit operates based on an identification result of the discharge lamp identification means such that the operating frequency of the switching element is substantially constant regardless of the identified discharge lamp at the time of full lighting. 17. The discharge lamp lighting device according to claim 1, wherein at least one of a duty ratio and an output voltage of the DC power supply circuit is controlled. 19. The control circuit according to claim 16, further comprising: an operating frequency of a switching element based on an identification result of said discharge lamp identifying means, wherein the operating frequency of the switching element is set to be substantially constant regardless of the identified discharge lamp at the time of full lighting. 17. The discharge lamp lighting device according to claim 1, wherein at least one of a duty ratio and an output voltage of the DC power supply circuit is controlled. 20. The control circuit according to claim 15, wherein the operation frequency of the switching element is controlled based on the identification result of the discharge lamp identification means so that the light output becomes substantially constant regardless of the identified discharge lamp at the time of full lighting. 17. The discharge lamp lighting device according to claim 1, wherein at least one of a duty ratio and an output voltage of the DC power supply circuit is controlled. 21. The control circuit according to claim 1, wherein, based on the identification result of the discharge lamp identification means, a filament current most suitable for the identified discharge lamp flows at all lightings. Item 16. The discharge lamp lighting device according to any one of Items 15. 22. The control circuit controls, based on the identification result of the discharge lamp identification means, such that a DC component is not superimposed on the lamp voltage when the discharge lamp is an argon gas lamp,
Further, when the discharge lamp is a mixed gas lamp, control is performed so that a DC component is superimposed on the lamp voltage.
The discharge lamp lighting device according to claim 13. 23. The control for preventing a DC component from being superimposed on the lamp voltage when the discharge lamp is an argon gas lamp is a control in which an on / off duty ratio of a switching element of the inverter circuit is approximately 50%. There is a control for superimposing a DC component on the lamp voltage when the discharge lamp is a mixed gas lamp,
3. A control in which an on / off duty ratio of a switching element of the inverter circuit is unbalanced.
2. The discharge lamp lighting device according to 2. 24. The control for preventing a DC component from being superimposed on the lamp voltage when the discharge lamp is an argon gas lamp is frequency control of a switching element of the inverter circuit, and the discharge lamp is a mixed gas lamp. 23. The discharge lamp lighting device according to claim 22, wherein the control for superimposing a DC component on the lamp voltage in the case of (c) is on / off duty ratio control of a switching element of the inverter circuit. 25. A lighting fixture characterized by combining a plurality of discharge lamp lighting devices for one lamp according to any one of claims 1 to 24 for multiple lamps.