JPH07106090A - Discharge lamp lighting device and lighting system - Google Patents

Abstract

PURPOSE:To obtain a discharge lamp lighting device, which can change quantity of modulation of a discharge lamp and a vision so as to correspond to each other. CONSTITUTION:At the time of controlling the modulation, quantity of modulation is set by a PWM modulation setting circuit 3, and the modulation is performed on the basis of this set quantity of modulation. A light emitting diode LED 1 is made to emit the light by the PWM modulation setting circuit 35, and with this emission, a photo-transistor PTr 1 is turned on. In the case where the phototransistor PTr 1 is turned off, a modulation control means 37 sets a charge curve with a resistor R2 and a capacitor C5, and in the case where the photo-transistor PTr 1 is turned on, the modulation control means 37 sets a discharge curve with a variable resistor R1 and the capacitor 5. Voltage corresponding to the quantity of modulation is outputted by the modulation control means 37. Since quantity of modulation to be set and the output of an inverter circuit are not linearly changed but changed like natural logarithm, quantity of modulation and visual brightness of a fluorescent lamp FL can be linearly changed.

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 device capable of dimming a discharge lamp.

[0002]

2. Description of the Related Art Conventionally, this type of discharge lamp lighting device sets a desired dimming amount, converts a PWM signal into a DC voltage according to the set dimming amount, and changes the DC voltage according to the width of the PWM signal. By doing so, the output voltage of the inverter circuit is changed to dim the discharge lamp. Then, the electric power to the discharge lamp of the inverter circuit is changed linearly with respect to the dimming amount set by the dimming setting means for setting the dimming amount.

However, since the output of the inverter circuit is linearly changed with respect to the dimming amount, when the output of the inverter circuit is large near the total light, the light of the discharge lamp changes with some dimming. The amount seems to be small, and when the output of the inverter circuit is small, the amount of change in the light of the discharge lamp is felt to be large even with a slight dimming.

[0004]

As described above, when the output of the inverter circuit is linearly changed according to the dimming amount, it is difficult to feel the change of the light of the discharge lamp in the portion where the output of the inverter circuit is large. On the contrary, there is a problem in that the dimming amount and the light change amount do not correspond to the visual sense, such that a small change in the output of the inverter circuit causes a large change in the light to be felt.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a discharge lamp lighting device and a lighting device in which a dimming amount of a discharge lamp and a visual change are associated with each other.

[0006]

A discharge lamp lighting device according to claim 1 is capable of dimming a discharge lamp by converting electric power from a power source into an arbitrary output set by a dimming setting means by the discharge lamp lighting means. In a discharge lamp lighting device having a discharge lamp lighting means for lighting the discharge lamp, the discharge lamp lighting means outputs a relatively large amount in a portion where the output to the discharge lamp is large according to the dimming amount set by the dimming setting means. Is adjusted to dimm the discharge lamp, and in a portion where the output to the discharge lamp is small, the output is relatively small and the discharge lamp is dimmed.

The discharge lamp lighting device according to claim 2 is the discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting means is
The discharge lamp is dimmed by changing the output in a natural logarithmic manner with respect to the dimming amount set by the dimming setting means.

A discharge lamp lighting device according to a third aspect of the present invention is the discharge lamp lighting device according to the first or second aspect, which is photo-coupled to the dimming setting means, and according to the dimming amount set by the dimming setting means. A dimming control means for controlling the dimming output is provided, and the dimming control means has a time constant circuit, and the time constant circuit changes the respective charging / discharging times to output the dimming output of the discharge lamp lighting means. Is to be set.

According to a fourth aspect of the present invention, there is provided an illuminating device in a fixture body,
The discharge lamp lighting device according to any one of claims 1 to 3 is provided.

[0010]

In the discharge lamp lighting device according to the first aspect of the present invention, the discharge lamp lighting means varies the output relatively large in a portion where the output to the discharge lamp is large according to the dimming amount set by the dimming setting means. Since the discharge lamp is dimmed and the discharge lamp is dimmed by varying the output relatively small in the part where the output to the discharge lamp is small, the output is the same even in the same dimming amount in the part where the output is hard to see. It is possible to feel a sufficient amount of dimming due to a large change, and even in the case of a small output where it is easy to feel a visual change, even if the dimming amount is the same, the output changes a little. Can handle the visual sense.

A discharge lamp lighting device according to a second aspect is the discharge lamp lighting device according to the first aspect, wherein the discharge lamp lighting means is:
Since the output of the discharge lamp is dimmed by changing the output in a natural logarithm with respect to the dimming amount set by the dimming setting means, the dimming amount and the visual sense can correspond.

A discharge lamp lighting device according to a third aspect of the present invention is the discharge lamp lighting device according to the first or second aspect, in which the dimming control means changes the respective charging and discharging times of the time constant circuit to light the discharge lamp. Since the dimming output of the means is set, the dimming amount can be changed with a simple configuration without being affected by temperature.

According to a fourth aspect of the present invention, there is provided an illuminating device in a fixture body,
Since the discharge lamp lighting device according to any one of claims 1 to 3 is provided, the dimming amount and the visual sense can correspond.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the discharge lamp lighting device of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, lamp sockets 12, 12 are provided at both ends of the instrument body 11 in the longitudinal direction, and a fluorescent lamp FL as a discharge lamp is provided between the lamp sockets 12, 12.
, And the discharge lamp lighting device 15 shown in FIG.

In this discharge lamp lighting device 15, as shown in FIG. 1, a rectifying / smoothing circuit 21 is connected to a commercial AC power source E, and this rectifying / smoothing circuit 21 has a commercial AC power source E with an input terminal of a full-wave rectifier 22. The smoothing capacitor C1 is connected to the output terminal of the full-wave rectifier 22.

A boost chopper circuit 23 which is a pre-regulator circuit is connected to the rectifying / smoothing circuit 21, and the boost chopper circuit 23 has a drain and a source of the inductor L1 and the field effect transistor Q1 between both terminals of the smoothing capacitor C1. Is connected, and the series circuit of the diode D1 and the capacitor C2 is connected between the drain and the source of the field effect transistor Q1.

Further, a half-bridge type inverter circuit 24 as a discharge lamp lighting means is connected to the step-up chopper circuit 23. The inverter circuit 24 has a drain, a source and a field effect transistor Q3 of the field effect transistor Q2.
Drain and source are connected in series.

Further, between the drain and the source of the field effect transistor Q3 of the inverter circuit 24, a DC cut capacitor C3, a choke coil L2, filaments FL1 and FL2 of the fluorescent lamp FL and an input winding CT1 of the current transformer CT are provided.
Are connected. A starting capacitor C4 is connected between the filaments FL1 and FL2 of the fluorescent lamp FL. Further, the current transformer CT is provided with a detection winding CT2 for detecting the lamp current of the fluorescent lamp FL.

Further, the fluorescent lamp FL is the fluorescent lamp.
With the voltage feedback circuit 31 that detects the lamp voltage of FL and feeds back this lamp voltage, the lighting detection circuit 32 that detects the lighting state of the fluorescent lamp FL by detecting the lamp voltage, and the lamp voltage and detection winding CT2. A constant power feedback circuit 33 that detects power based on the detected lamp current is connected. In addition, the voltage feedback circuit 31 pre-heats each filament FL1, FL2 at the time of starting the fluorescent lamp FL, and then
Is connected to the soft start circuit 34.

On the other hand, a PWM dimming setting circuit 35 is provided as a dimming setting means for setting a dimming amount by a dimming setting knob (not shown) and performing PWM output according to the set amount.
The PWM dimming setting circuit 35 is connected to the dimming control means 37 via a photocoupler 36 including a light emitting diode LED1 and a phototransistor PTr1.

The dimming control means 37 includes a variable resistor R1 between the collector and emitter of the phototransistor PTr1.
A series circuit of a capacitor C5 and a capacitor C5 is connected.
The resistor R2 connected to CC is connected, and the capacitor C5 is connected to the resistor R3 and the parallel circuit of the capacitor C6 and the resistor R4.
Of the comparator 38, and the non-inverting input terminal of the comparator 38 is connected to the detection winding CT2. The resistance value of the resistor R2 is set to be larger than the resistance value of the variable resistor R1, and by changing the ratio of the resistance value of the variable resistor R1 to the resistance value of the resistor R2, as shown in FIG.
The voltage VC6 and the on-duty characteristic change. Also,
Since the dimming amount and the voltage change in a natural logarithmic manner, the relationship between the dimming amount and the sight of the fluorescent lamp FL can be made linear.

Further, the output terminal of the comparator 38 is connected to a VFO 39 for converting a voltage into a frequency, the output terminal of the VFO 39 is connected to the gates of the field effect transistors Q2 and Q3, and each field effect transistor Q2, Control Q3. Further, an oscillation stop circuit 40 for stopping the boost chopper circuit 23 and the inverter circuit 24 is connected.

Further, the filament FL1 of the fluorescent lamp FL,
A lamp mounting detection circuit 41 that detects whether or not these filaments FL1 and FL2 are mounted is connected to FL2, and this lamp mounting detection circuit 41 is connected to an oscillation stop circuit 40.

Further, a safety circuit 42 for stopping the oscillation when the lamp voltage is abnormal is connected, and the safety circuit 42 is connected to the oscillation stopping circuit 40.

Next, the operation of the above embodiment will be described.

First, the voltage of the commercial AC power source E is converted into a full-wave rectifier.
Full-wave rectification is performed at 22, and smoothing is performed at the smoothing capacitor C1. Then, the soft-start circuit 34 causes the field effect transistor Q2, VFO39 through the voltage feedback circuit 31,
The inverter circuit 24 is driven by oscillating Q3, and the fluorescent lamp FL is preheated by soft start which is a low voltage.
Then, after a lapse of a predetermined time, the soft start circuit 34 terminates the soft start, and the VFO 39 increases the output voltage of the inverter circuit 24 to start lighting the fluorescent lamp FL. Further, the boost chopper circuit 23 is started to reduce the input harmonic current.

When the fluorescent lamp FL is turned on all the light, when the lamp voltage increases thereafter, the constant power feedback circuit 33 controls the VFO 39 to control the inverter circuit 24 at constant power. Further, when the lamp voltage decreases, the comparator 38 controls the VFO 39 to control the inverter circuit 24 at constant power. When all lights are turned on, the output voltage of the dimming control means 37 is set to be the highest with the PWM dimming setting circuit 35 not outputting any ON width.

When controlling the dimming, a dimming amount is set by a knob or the like not shown, and the PWM dimming setting circuit 35
The light is adjusted according to the light adjustment amount set by. And PW
The M dimming setting circuit 35 causes the light emitting diode LED1 to emit light, and the phototransistor PTr1 is turned on in accordance with this emission.

Further, in the dimming control means 37, when the phototransistor PTr1 is off, the charging curve shown in FIG. 3 is set by the resistor R2 and the capacitor C5, and when the phototransistor PTr1 is on, The discharge curve shown in FIG. 3 is set by the variable resistor R1 and the capacitor C5. That is, when pulse output is performed by the PWM dimming setting circuit 35, the charge of the capacitor C5 is discharged, and when pulse output is not performed, the capacitor is discharged.
Charge C5 charge. Then, using the capacitor C6,
The triangular wave indicated by is smoothed, and the voltage corresponding to the dimming amount is output by the dimming control means 37. Then, the lamp current is compared with the output from the dimming control means 37, and the lamp current of the fluorescent lamp FL is kept constant by feedback,
Dimming control.

Then, the dimming amount to be set and the inverter circuit
The relationship with 24 is that when the output of the inverter circuit 24 is small, the output voltage changes relatively small with respect to the change of the dimming amount, and when the output of the inverter circuit 24 is large, the dimming amount of The output voltage changes relative to the change,
That is, since it changes in a natural logarithm, the dimming amount and the visual sense can be linearly associated with each other.

Further, the lamp mounting detection circuit 41 detects the mounting of the filaments FL1, FL2, and when the fluorescent lamp FL is not mounted, the oscillation stopping circuit 40 stops the step-up chopper circuit 23 and the inverter circuit 24.

Further, when the lamp voltage rises,
For example, since the end of life of the fluorescent lamp FL,
The oscillation stop circuit 40 stops the boost chopper circuit 23 and the inverter circuit 24.

In the above embodiment, the photocoupler is used, and the operation is performed in the saturation region because the current is small. Therefore, it is possible to reduce changes and variations in characteristics due to temperature.

In the above embodiment, any inverter circuit other than the half-bridge type can be used as the inverter circuit, and the pre-regulator circuit can also be used.
Any pre-regulator circuit other than the boost chopper circuit can be used.

[0036]

According to the discharge lamp lighting device of the first aspect of the present invention, the discharge lamp lighting means outputs a relatively large amount in a portion where the output to the discharge lamp is large according to the dimming amount set by the dimming setting means. The discharge lamp is dimmed by varying the output, and the discharge lamp is dimmed by changing the output relatively small in the area where the output to the discharge lamp is small, so the same dimming is performed in the area where the output is hard to see. Because the output changes greatly even with the amount of light, you can feel the dimming sufficiently, and in the small part of the output where it is easy to feel the visual change, the output changes slightly even with the same dimming amount, so you do not feel the dimming more than necessary. It can correspond to the dimming amount and the visual sense.

According to the discharge lamp lighting device of the second aspect,
In addition to the discharge lamp lighting device according to claim 1, since the discharge lamp lighting means dimmers the discharge lamp by changing the output in a natural logarithm with respect to the dimming amount set by the dimming setting means, It can correspond to the amount of light and the sight.

According to the discharge lamp lighting device of the third aspect,
In addition to the discharge lamp lighting device according to claim 1 or 2, the dimming control means sets the dimming output of the discharge lamp lighting means by changing each time of charging / discharging of the time constant circuit, so that a simple configuration. The dimming amount can be changed without being affected by temperature.

According to the lighting device of the fourth aspect, since the discharge lamp lighting device according to any one of the first to third aspects is provided in the fixture body, the dimming amount and the visual sense can be corresponded.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing the outer appearance of the above lighting device.

FIG. 3 is a waveform diagram showing the relationship between the PWM output and the charge / discharge of the dimming control means 37, same as above.

FIG. 4 is a characteristic diagram showing a relationship between a resistance R1 and a resistance R2 and an on-duty.

[Explanation of symbols]

 11 Instrument main body 24 Inverter circuit as discharge lamp lighting means 35 PWM dimming setting circuit as dimming setting means 37 Dimming control means E Commercial AC power supply

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Takahashi 4-3-1, Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation

Claims (4)

[Claims] 1. A discharge lamp lighting device provided with a discharge lamp lighting means for converting the electric power from a power source into an arbitrary output set by the dimming setting means by the discharge lamp lighting means and lighting the discharge lamp dimmably. The discharge lamp lighting means, according to the dimming amount set by the dimming setting means, relatively greatly varies the output in a portion where the output to the discharge lamp is large to dimm the discharge lamp, The discharge lamp lighting device is characterized in that the discharge lamp is dimmed by changing the output relatively small in a portion where the output is small. 2. The discharge lamp lighting means dims the discharge lamp by changing its output in a natural logarithmic manner with respect to the dimming amount set by the dimming setting means. Discharge lamp lighting device. 3. A dimming control unit that is photo-coupled to the dimming setting unit and controls a dimming output according to a dimming amount set by the dimming setting unit, wherein the dimming control unit has a time constant. 3. The discharge lamp lighting device according to claim 1, further comprising a circuit, wherein the time constant circuit sets the dimming output of the discharge lamp lighting means by changing respective charging and discharging times. 4. An illuminating device comprising a fixture main body provided with the discharge lamp lighting device according to claim 1.