JPH07272886A - Lighting device for variable light color fluorescent lamp - Google Patents

Abstract

PURPOSE:To realize a wide light color change by applying pulse voltage, wherein pulse width, a duty ratio, and voltage are optionally adjusted according to the division of light source color, to a variable light color lamp from a high speed electric power switching circuit. CONSTITUTION:A pulse lighting device 1 applies pulse voltage to a variable light color fluorescent lamp 2 from a high speed electric power switching circuit driven by a skeleton circuit 40 and a timing adjustor 5. In this case, the circuit 40 can adjust both pulse width W and a repeat period T to 0.2mus-100mus and a duty ratio D to 0-100% by a pulse generator 41 and a duty ratio adjustor 42. The ratio D can be adjusted to values at intervals according to continuous adjusting or a lamp bulb color division, and the preheating of the filament of the lamp 2 is turned on/off by the ratio D. For instance, applying pulse voltage of 150-350V having a width W of 1mus, a period T of 2-3mus, and a ratio D of 50-3% to the lamp 2 of an argon or mercury system, obtaining a color change from neutral white to lamp bulb color. This realizes a wide light color change.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable light color fluorescent lamp for comfortable lighting in which the light color of a single fluorescent lamp can be changed according to the ambient environment such as cold, dry and humid conditions, and the sensation of the lamp user. The present invention relates to a pulse lighting device.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 53-42386 discloses a current waveform control discharge display device for lighting a discharge display lamp containing a gas or vapor mixture emitting a monochromatic spectrum with a rectangular wave or a modified wave thereof. There is. In this device, each visible light emission of two or more types of discharge is switched and displayed by controlling the current waveform.

Illuminating Engineering Society, Vol. 60, No. 10, p. 529 (197)
6 years) shows an example of lighting a discharge lamp that drives a bipolar power transistor by a control pulse composed of an oscillator circuit, a Schmitt trigger circuit, and a constituent circuit of a monostable multivibrator.

JP-A-5-47485 discloses a variable color discharge lamp lighting device provided with a dimming control means for individually adjusting the light output of a plurality of discharge lamps having different light colors to obtain a desired mixed color light. It is disclosed.

Japanese Unexamined Patent Publication (Kokai) No. 5-135744 discloses a variable light color fluorescent lamp which changes the light amount ratio of blue light emission and red light emission.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The device of 2386 is a device provided with means for changing the light color by changing the energization of the discharge tube current, changing the dwell time, or controlling the current waveform to change the electron energy of the mixture of gas or vapor. Therefore, it is different from a device equipped with a means for changing the light color by utilizing the characteristic difference of each phosphor as described later, and even if it is excellent in switching the light color of the display, it is not always necessary to illuminate. Not suitable for.

In addition, lighting using a bipolar power transistor described in the Journal of the Lighting Society is unsuitable for instantaneous switching of light colors because the storage time is long and the cutoff characteristic is not good.

Japanese Unexamined Patent Publication (Kokai) No. 5-47485 is a device for collectively controlling the dimming of a plurality of discharge lamps having different light colors, and is not a device for controlling the light color of a single lamp.

The object of the present invention is the above-mentioned Japanese Patent Laid-Open No. 5-135.
Another object of the present invention is to provide a convenient lighting device that is capable of using the variable light color fluorescent lamp disclosed in No. 744 as a load and that is unique in duty ratio adjustment and pulse voltage adjustment.

[0010]

The variable light color fluorescent lamp connected to the pulse lighting device according to the present invention converts the ultraviolet light generated by the discharge into visible light, and the relative light quantity ratio of the blue light emission and the red light emission. It is a fluorescent lamp characterized in that the color of light of a single lamp is changed by changing to 1. The glass tube or hot cathode type filament used therefor may be the same as that of a general-purpose fluorescent lamp. Therefore, the appearance of the lamp is no different from that of a general-purpose fluorescent lamp. Even if the lamp has two terminals attached to the lead wire of the filament at one end of the lamp and two terminals also attached to the other end. Good.

On the other hand, the phosphor coated on the glass tube is different from that of a general-purpose fluorescent lamp. Considering that the visible light emission distribution of the lamp is composed of three color components of blue, green and red, these three color phosphors satisfy at least one of the following two combinations. .

In one combination, the afterglow characteristics of the three-color phosphors are remarkably large, and for example, blue is τ small and red is τ large based on the emission decay time constant τ of green. .

In another combination, selection is made so that the difference in the brightness saturation characteristics of the three-color phosphors becomes large with respect to the same pulse voltage margin. For example, when the pulse voltage is increased by 30 V, the blue color increases the brightness in proportion to the voltage increase, while the red color causes a brightness saturation phenomenon with respect to the voltage increase and shows only a slight increase in the brightness. . As a result, the intensity balance of blue and red is lost and the visible light emission distribution is changed. The above-described effective light color control for a fluorescent lamp having a completely novel combination of phosphors is achieved only by using the pulse lighting device described below.

The first of the notable means in the pulse lighting device is a color classification selection circuit built in the basic circuit block. With this selection circuit, fluorescent lamp color classification,
That is, the lamp user can arbitrarily select the discrete color division regions of daylight color, neutral white, white, warm white, and light bulb color. Further, depending on the preference of the lamp user, continuous selection through the color segment areas is also possible.

The second of the notable means is a high-speed and high-voltage power switching circuit capable of amplifying the DC pulse signal generated from the main circuit block and turning on and off the fluorescent lamp in the order of microseconds. It is a point to have. As a result, the lamp can be easily turned on regardless of whether it is a rare gas or a low-pressure mercury vapor, and the light color can be switched instantly.

The third of the notable means is that a preheating circuit for turning on and off the preheating of the filament of the fluorescent lamp according to the duty ratio signal is provided. When the pulse voltage is high and the duty ratio is also high, there is sufficient charge in the lamp and preheating of the filament is not required. The pulse waveform may be deformed due to the preheating of the filament. An automatic preheat cutoff circuit is useful for this kind of countermeasure.

Further, there is an advantage that a transmission / reception circuit that can change the light color by remote control is provided.

[0018]

The operation of the invention according to claim 1 will be described with reference to FIGS. Figure 2 shows the circuit configuration of the pulse lighting device.
A part of the backbone circuit block, which is the heart, is taken out and shown in FIG. First, FIG. 2 will be described. FIG. 2 includes a pulse lighting device 1 and a variable light color fluorescent lamp 2. 1
Is a DC generator 3 that rectifies and smoothes a commercial AC power source to generate DC, a logic-compatible pulse generator 41 that can adjust the duty ratio from zero to 100%, and continuously adjusts the duty ratio or according to the color classification of the lamp. The output voltage 6 includes a duty ratio adjuster 42 capable of selecting a value, a transmitter / receiver 43 for remotely selecting the duty ratio, a timing setting circuit 5 for surely performing high speed switching, and a high speed power switching circuit 6. Is one of the opposing filaments 2a attached to the lamp 2.
Apply to. A current-adjustable suppressing element 7 for suppressing a discharge current is connected to the other filament 2b, and the other end of 7 is grounded. The filament 2b on the ground side has a preheating circuit 8
0, connected to the automatic preheat cutoff circuit 81,
Preheat is turned on / off in response to the signal of 2.

Next, FIG. 1 will be described. This figure corresponds to the pulse generator 41 and the duty ratio adjuster 42 of FIG. When the adjusting knob 9 is rotated, the decimal signal is code-converted into binary by the encoder 10 and stored in the color classification ROM table 11. The contents of 11 will be described later. The duty ratio signal output from 11 resets the down counter 13 driven by the clock generator 12, and when the number of clock pulses reaches a certain number of clock pulses, for example, 50 pulses, according to the data of the duty ratio preset to 11, Emits a pulse of one cycle. The pulse width is set in advance by the pulse width generator 14
Adjust in advance.

[0020]

[Table 1]

Table 1 is an example of the contents of the ROM table 11 and shows the correspondence between the color classification and the ROM contents. Numerical values in the right column of the table are duty ratio values in%. This value was experimentally determined so as to be within the chromaticity point in each color segment of the light source color in FIG. In addition, FIG. 3 is JIS Z
9112-1990 is a color division diagram, in which the quadrangle is daylight color 15, daylight white 16, white 17, warm white 18, in order from the left.
Corresponds to light bulb color 19. Also, of the two curves that pass through the quadrangle, the upper side represents the CIE synthetic daylight curve 20, and the lower side represents the black body radiation locus 21.

In summary, the color segment selection circuit of FIG. 1 can be used to arbitrarily select the color segment of FIG. Therefore, the high-speed switching circuit 6 of FIG. 2 is driven by a signal from the duty ratio adjuster 42, and if the duty ratio is selected to be large, the three color phosphors of blue, green, and red applied to the lamp 2 are combined. If the daylight color 15 is obtained by light emission and a small duty ratio is selected, for example, the short afterglow blue component disappears remarkably quickly during the extinction pulse, but the long afterglow red component emission continues until the next pulse appears. A bulb color 19 is obtained because it lasts.

Since the high-speed switching circuit 6 of FIG. 2 can obtain a high voltage, it can be applied to a variable light color fluorescent lamp of a type in which the pulse voltage is changed while the duty ratio is fixed as shown in the second embodiment. Applicable. For example, by combining blue and red with different brightness saturation characteristics for the same pulse voltage margin, the intensity balance of blue and red is destroyed just by adjusting the pulse voltage, and the light color before adjustment is instantaneously changed. It has the effect of changing.

[0024]

【Example】

(Example 1) In order to obtain an average current of the lamp of 600 mA or more, a pulse lighting device was prepared in which lighting and extinction were repeated at high speed. In the basic circuit block 40 of FIG. 2, the pulse width W and the repetition period T are both 0.2 μs to 100 ms,
The duty ratio D is designed to be adjustable from zero to 100%. Next, the high-speed switching circuit 6 has the configuration shown in FIG.
As shown in, p-channel and n-channel MOS F
ET was used as a complementary pair, and a 20 W, 100 Ω buffer resistor was connected to each FET. When the switching accuracy of lighting and extinguishing is low, a large current flows through both the p and n channels, and the FET is burnt. Therefore, the timing adjustment circuit 5 is provided to improve the switching accuracy of the FET.

Pulse width W = 1 μs constant, repetition period T =
2 μs to 32 μs, that is, the duty ratio D = 50 to 3%,
Under the condition of pulse voltage of 150 to 350 V, an argon-mercury type 8 W variable color fluorescent lamp was lit in a high current region higher than the rated current, that is, 200 mA or more. The change in light color from to light bulb color 19 was obtained. When D = 50%, the maximum average current of the lamp was 700 mA.

(Embodiment 2) A pulse lighting device for repeating lighting and extinguishing at high speed and high voltage was prepared for the purpose of obtaining a pulse voltage of 500 V or more applied to a lamp. The basic circuit block 40 and the high-speed power switching circuit 6 in FIG. 2 are the same as those in the first embodiment, but a transformer 22 as shown in FIG. 5 is inserted between 6 and the timing adjusting circuit 5 for the purpose of boosting. The winding ratio of the transformer coil using the ring-shaped ferrite core was set to 15:15. Pulse voltage 500
V, pulse width W = 3 μs constant, repetition period T = 5 μs or more, the brightness saturation characteristics are different 3
A variable light color fluorescent lamp, which is coated with a color phosphor and is filled with xenon 133 Pa, is turned on. As a result, a light color change from white 17 to light bulb color 19 was obtained for a pulse voltage margin of 100V. The maximum pulse voltage of the created device is 70
It was 0V.

[0027]

As described above, according to the present invention, a variable light color fluorescent lamp comprising a bulb and a filament of a general-purpose fluorescent lamp is repeatedly turned on and off by a high-speed power switching operation corresponding to logic of the order of microseconds. This has the effect that a wide range of light color changes can be realized instantly. Not only is it easy to select the desired color category by adjusting the duty ratio, but also because a high pulse voltage can be obtained, even if the fill gas of the variable light color fluorescent lamp is mercury vapor, it is a rare gas with a high ionization voltage. Can be easily turned on and can be used for light color control. Since the load has the same shape as a general-purpose fluorescent lamp, there is also an advantage that the device of the present invention can be relatively easily connected to the socket of a conventional lighting fixture.

[Brief description of drawings]

FIG. 1 is a block diagram of a color classification selection circuit.

FIG. 2 is a circuit configuration diagram of the device of the present invention.

FIG. 3 is a diagram showing color classification of a fluorescent lamp.

FIG. 4 is an example of the present invention.

FIG. 5 is an example of the present invention.

[Explanation of symbols]

1 ... Pulse lighting device, 2 ... Variable light color fluorescent lamp, 2a,
2b ... Filament, 3 ... DC generator, 40 ... Core circuit block, 41 ... Pulse generator, 42 ... Duty ratio adjuster, 43 ... Transceiver, 5 ... Timing adjuster, 6 ... High speed power switching circuit, 7 ... Discharge Current suppressing element, 80
... Preheat circuit, 81 ... Automatic preheat cutoff circuit, 9 ... Duty ratio adjustment knob, 10 ... Encoder, 11 ... Color classification ROM
Table 12 ... Clock generator, 13 ... Down counter, 14 ... Pulse width generation circuit, 15 ... Daylight color classification, 16
... day white category, 17 ... white category, 18 ... warm white category, 1
9 ... Light bulb color classification, 20 ... CIE synthetic daylight curve, 21 ... Blackbody radiation locus, 22 ... Transformer.

Claims (4)

[Claims] 1. A variable light color fluorescent lamp for comfortable lighting in which the light color of a single fluorescent lamp is controlled by an external signal in accordance with the ambient environment such as cold, dry and humid conditions, and the pulse lighting device of the fluorescent lamp comprises a light source color. As a basic circuit block, a duty ratio adjuster with a built-in color classification selection circuit that is set to select at least two classifications, namely daylight color, neutral white, white, warm white, and light bulb color A lighting device for a variable light color fluorescent lamp. 2. A high-speed power switching circuit capable of amplifying a DC pulse signal generated from the basic circuit block of claim 1 to turn on and off the fluorescent lamp at high speed, and preheating the filament of the fluorescent lamp. A variable light color fluorescent lamp lighting device comprising a preheating circuit which is turned on and off according to a duty ratio signal. 3. A code conversion circuit for converting a duty ratio from a decimal logic to a binary logic and a continuous adjustment knob so that continuous selection can be performed by penetrating a light source color division area. A lighting device for a variable light color fluorescent lamp, which is characterized in that 4. A lighting device for a variable light color fluorescent lamp according to claim 1, further comprising a transmission / reception circuit capable of changing a light color by remote control.