JPS60165093A - Device for firing fluorescent lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This invention relates to a lighting device for a straight tube fluorescent lamp that uses a cycle-by-cycle lighting method.

BACKGROUND OF THE INVENTION The lighting field has also benefited from the remarkable technological development of the semiconductor industry in recent years, and fluorescent lamp lighting devices have become increasingly smaller, lighter, and more efficient due to electronic lighting circuits applied to semiconductor devices. We are being commercialized. One of the most effective ways to reduce the size, weight, and efficiency of such a fluorescent lamp lighting device is a fluorescent lamp lighting device using the every-cycle lighting method, which is the background art of the present invention.

The above-mentioned cycle-by-cycle lighting method is a method proposed by the present applicant as disclosed in Japanese Patent Publication No. 58-21796, etc., and its basic technology is to convert the lamp voltage of the fluorescent lamp into a low-frequency AC power supply (usually a commercial AC power supply). At the beginning of every half cycle of the low-frequency AC power source of this fluorescent lamp, restriking energy is given by high-frequency energy from an electronic circuit that intermittently oscillates high-frequency waves to keep it lit.

For example, the basic circuit of a lighting device for one fluorescent lamp according to this method is shown in FIG. 1, and its basic operation will be explained.

In Figure 1, AC is a low frequency AC power supply, CH is a single-turn current limiting choke which is a current limiting device, and FL is a straight tube fluorescent lamp, which is connected to the low frequency AC power supply AC through the current limiting choke CH. be done. R is a booster circuit of high frequency output generating means, which is a series circuit of an intermittent oscillation capacitor C1 and an oscillating circuit R' connected in parallel to the fluorescent lamp FL. The oscillating circuit R' is a circuit in which an oscillating capacitor C2 is connected in parallel to a series circuit of a bidirectional two-terminal thyristor S and a boost inductor L, which are switching means, for example.

The above lighting device performs the following basic operations. That is, when the low frequency AC power supply AC is turned on, the booster circuit R operates to preheat the electrode (filament coil) of the fluorescent lamp FL, and
A high frequency high voltage is applied between both electrodes, and the fluorescent lamp FL starts discharging. Then, due to the combination of the inductance of the current limiting choke CH, the capacitance of the intermittent oscillation capacitor 9-01, and the discharge characteristics of the fluorescent lamp FL, the booster circuit R operates at the beginning of the half cycle of the power supply frequency, and the fluorescent lamp FL is turned on again. An arc voltage (high frequency high voltage) is applied to relight the fluorescent lamp FL. After re-ignition at the beginning of this half cycle, lamp current flows through the fluorescent lamp FL, and the operation of the booster circuit R is temporarily stopped.At the beginning of the next half cycle with the opposite polarity, the booster circuit R operates again and the fluorescent lamp is emitted. The lamp FL is re-ignited and this operation is repeated at the beginning of every half cycle of the power supply frequency to keep the fluorescent lamp FL lit. Figure 2 shows the voltage and current waveforms when the fluorescent lamp is lit using this method. Note that the waveform e1 in FIG. 2 is the power supply voltage waveform, and the waveform e
2 is a lamp voltage waveform, waveform i is a lamp current waveform, and e3 is a high-frequency voltage waveform for restriking.

By the way, in the conventional general fluorescent lamp lighting method using a glow starter, stable lighting cannot be maintained unless the lamp voltage is set to about 60% of the power supply input voltage, so a large ballast is required. was required, and the power loss was correspondingly large. On the other hand, in the above-mentioned every-cycle lighting method, the lamp voltage and the power supply voltage can be made sufficiently close to each other, making it possible to downsize the public ballast, reduce power loss, and improve overall efficiency. It has been found that the features of this every-cycle lighting system are more effectively exhibited when the lamp voltage of the fluorescent lamp used is closer to the power supply voltage. but,
Existing practical fluorescent lamps are not designed so that the lamp voltage is optimal for the every-cycle lighting method, and as a result, the characteristics of the every-cycle lighting method are not fully demonstrated. For example, an FLRIIOH/A fluorescent lamp with a rated power consumption of 110 watts has a lamp voltage of approximately 150 watts.
One of the lamps is lit by a lighting device that uses a 200V AC power source to turn on the lamp every cycle, but the difference between the lamp voltage and the power supply voltage is large, and the effect of the lighting system every cycle is only marginal.

C1 Purpose of the Invention The present invention is a fluorescent lamp lighting system that combines an every-cycle lighting system and a fluorescent lamp that more effectively exhibits the features of this system to realize a lighting system with even better performance. The purpose is to provide equipment.

29. Structure of the Invention The present invention is a lighting device of every-cycle lighting system, and the fluorescent lamp to which it is applied has a tube length of 1650±20 mm and a tube diameter of 2.
5.5±2.5mm, the pressure of the sealed gas is 1.0~3.
100% argon at 5 Torr, lamp current 150
It is characterized by the use of a straight tube fluorescent lamp that is lit at ~400 mA and a lamp voltage of 165 to 200 V. When using a single fluorescent lamp like this, it is best to use a 200 V AC power source and turn it on every cycle, and when using a 400 V AC power source, two of the above fluorescent lamps can be connected in series. If it is turned on, the features of the every-cycle lighting method can be effectively demonstrated.

E. Example Straight tube fluorescent lamps used for indoor lighting and signboard lights in general homes, shops, offices, etc. are mainly 20 watt, 40 watt, and 110 watt types. However, depending on the purpose, there were times when there was no suitable pipe length. For example, a straight tube fluorescent lamp with a tube length close to 6 shaku (1800 mI11) is desired for a general signboard light of 6 shaku (1800 mI11), but
The 0 watt type has a pipe length of 1198 mm, which is too short, so if this was used, it had to be used in combination with a 20 watt type, which had a pipe length of 580 mm. Therefore, in order to eliminate this inconvenience, the present applicant first developed a fluorescent lamp with a tube length of 1650±20 mm, which is close to 6 shaku.

Since the lamp voltage of such a fluorescent lamp is close to 200V, the inventor of the present invention found that this fluorescent lamp is most suitable for a cycle-by-cycle lighting method using a 200V AC power supply, and the inventor of the present invention discovered that this fluorescent lamp is ideal for a cycle-by-cycle lighting method using a 200-V AC power supply. To provide a lighting device that lights up using a method.

In the case of one fluorescent lamp, the circuit for implementing the present invention may be the basic circuit shown in Fig. 3, which is a direct application of the basic circuit shown in Fig. 1, and in this case, the low frequency AC power supply AC' is a 200 V commercial AC power supply. be done. Further, FIG. 5 shows the lamp characteristics when the fluorescent lamp FL' under the above conditions shown in FIG. 3 is turned on in the every-cycle lighting method. However, the power supply frequency is 60Hz and the ambient temperature is 25°C.

In Figure 5, graph A shows the relationship between lamp current (mA) and lamp voltage (V), and graph B shows the relationship between lamp current (mA).
Graph C shows the relationship between lamp current (W) and lamp power (W).
The relationship between mA) and lamp efficiency (j2m/W) is shown. It should be noted that the lamp efficiency is based on the case where the fluorescent lamp FL' is of a three-wavelength region emission type.

It can be seen from FIG. 5 that the lamp voltage can be made sufficiently close to the power supply voltage, making the fluorescent lamp FL' suitable for the cycle-by-cycle lighting method. In reality, it is desirable to set the lamp voltage within the range of 170 to 180 cm in consideration of fluctuations in the power supply voltage for the best stability. Further, considering efficiency, the upper limit of the lamp current is 400 mA, and the lamp voltage at this time is 165 V. If the lamp voltage drops below 165 V, the effectiveness of the every-cycle lighting method will decrease, which is not preferable.

In addition, the tube diameter of the fluorescent lamp FL'' is 25.5±2.
5mm is the same as the center value of the bulb diameter standard for 10W and 15W trunk straight fluorescent lamps according to the JIS standard, and also T8 rank (8/8 inch) according to the IEC international standard.
This is because if it is less than 23.0 mm, the lamp voltage will become high, which may cause difficulty in starting, unstable discharge, and difficulty in maintaining lighting.
This is because if the temperature exceeds this value, the lamp voltage will decrease and the lamp current will increase. In addition, the regulation of the filling pressure of 100% argon filling gas from 1.0 to 3.5 Torr means that if it exceeds 3.5 Torr, it will be difficult to start, the brightness will decrease, etc.
This is based on the reason that dividing r causes inconveniences such as significantly shortening the lamp life.

The present invention is not limited to the use of one fluorescent lamp FL". For example, in the case of two fluorescent lamps, two fluorescent lamps FL' and FL" are connected in series as shown in FIG. By using a low-frequency alternating current power supply AC''', an effective cycle-by-cycle lighting device for two lamps can be obtained. In addition, T in Fig. 4 is a fluorescent lamp F.
This is a transformer as a means for preheating the electrodes L'' and FL'.

As described in detail in Section 1, the present invention aims to reduce the size and weight of a fluorescent lamp lighting device of the every-cycle lighting method by selectively using a fluorescent lamp that can best exhibit the characteristics of the every-cycle lighting method. High efficiency can be achieved and a lighting system with even better performance can be provided.

[Brief explanation of the drawing]

FIG. 1 is a basic circuit diagram showing an example of a fluorescent lamp lighting device of the every-cycle lighting method, which is the background of the present invention, and FIG.
Waveform diagrams of voltage and current at each part in the figure, Figures 3 and 4
The figures are basic circuit diagrams showing two embodiments of the present invention, and FIG. 5 is a lamp characteristic diagram of the fluorescent lamp in FIG. 3. AC', AC"--low frequency alternating current power supply, CH--current limiting device (current limiting choke), FL"--fluorescent lamp, R--high frequency output generating means (boosting circuit).

Claims (1)

[Claims] (1) a low frequency AC power source, a current limiting device, and a fluorescent lamp connected to the low frequency AC power source via the current limiting device;
connected in parallel to the fluorescent lamp, and activated at least at the beginning of each half cycle of the low frequency AC power supply after starting the fluorescent lamp to apply a high frequency high voltage for restriking the fluorescent lamp to light it; and a high frequency output generating means for maintaining the fluorescent lamp, the fluorescent lamp has a tube length of 1650±
20mm, the tube diameter is 25.5±2.511m, the filled gas is 100% argon with a pressure of 1.0 to 3.5 Torr, the lamp current is 150 to 400 mA, and the lamp voltage is 1
A fluorescent lamp lighting device characterized by using a straight tube fluorescent lamp having a voltage of 65 to 200V.