JPS5873997A - Device for firing discharge 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 The present invention is a lamp that is designed to prevent inconveniences caused by the discharge lamp tube substantially turning off when the discharge lamp enters a half-wave discharge state and the half-wave discharge state continuing. Related to electric light lighting devices.

Conventionally, there is a device as shown in FIG. 1 as a lighting device for lighting a discharge lamp at high frequency using a transistor, a transformer, etc. In this figure, +1) at i is a power supply, and this power supply txt indicates a DC power supply consisting of a commercial power supply 12) and a rectifier +31. +4) is a transistor inverter, which is mainly composed of a pair of transistors 15] (61, an inverter transformer (7), an inductor 191 provided at the input terminal, and a resonance capacitor (8). The transistor inverter (41) oscillates at, for example, 20 to 40 $x due to the resonance effect between the resonance capacitor (81) and the inverter/transformer 171.
(61 is the base resistance σ(II, [111, (
The base current is supplied from the power source II through the inverter transformer (7), but after starting, the output of the windings 1il11!
It is supplied via. Inverter transformer (
7) Hara-cage transformer and its secondary 'IIJK
Filament winding 1IIQIJ provided.

■As well as preheating the filament tube on the surface of the discharge lamp,
The discharge lamp n is turned on by the secondary winding 1lI (to). At this time, the tube voltage of discharge lamp a♂ is.

812I is symmetrical with lI#/c shown in Figure (1). However, when the t + ui substance of the electric discharge lamp is exhausted, a so-called half-wave discharge state occurs in which the discharge current flows only in one direction, and the tube discharges as shown in Figure 2 (b). The voltage becomes asymmetrical. In this way, the discharge current flows only in one direction (then the 2eK11 string of inverter transformer 17#
) is biased, and the discharge current is 1.5 to 2 times higher than normal.
m & flowing t/c Oo resulting linear conclusion 1m121
), there is also a big difference between the inverter trunk and the transistor +61.161.
When one discharge lamp surface is lit for a long time.

The allowable temperature of those parts wjL value'f- will be exceeded and the temperature of the parts will be exceeded! ! will be significantly reduced.

“Also, if such a half-wave discharge mth continues, the discharge lamp may be destroyed. This phenomenon will be explained using the t-1fla diagram. Therefore, the exhausted filament (17) of the cathode material and the tip of the lead edge (172) are bombarded with mercury ions with very low energy, and a large amount of the electric ring material is applied. Splashing t# - causes carcinogenic discharge.

In some cases, filamen) : (171) may become a - line. If the lighting continues, the filament (171) or 9-do @ (1723) will be sufficient as the cathode part for sustaining the discharge tube, and the discharge will spread over the entire surface of the lead wire, and the base of the lead wire, etc. When a high-temperature area is formed in a part of N1, the electron emission causes the discharge to concentrate in that part, causing the temperature to rise further.As a result, as shown in Figure 3 (m
Slam (17J cracked (1743) as shown in l)
As shown in Figure 1 (b), there was a risk that the high-temperature electrical component metals that had been deformed or melted would come into contact with the valve (1753) and cause cracks (1753), leading to damage to the valve V.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an entire discharge lamp apparatus that can protect components from excessive component stress when the cathode material of the discharge lamp is consumed and can prevent accidents due to bulb breakage.

An embodiment of the present invention will be described below with reference to the fourth to sixth factors.

In FIG. 4, the same parts as in FIG. 1 are shown with the same reference numerals. @ is a detection device, which has a detection winding # (It) wound around the above-mentioned in-parts transformer (7102nd order II#).Furthermore, this detection device transmits the output of the above-mentioned detection winding 4I (to) to the entire tgI dormitory. rectifier @, this rectifier flt, vessel (
This resistance (support) of the connected resistance between the output terminals [i1]
A series circuit of a capacitor surface and a resistor connected in parallel with the output terminals A and B at both ends of the resistor.
It is something we have, and it is also a must! It has a capacitor (to), etc., depending on the situation. This detection device lIt+221c detects an asymmetric voltage generated in the secondary winding of the inverter transformer (7) via the detection winding ai@t- when the discharge lamp a9 enters a half-wave discharge state, and The detection signal tube is output from the output terminal.

@ is a control device which receives a detection signal from the detection device and limits the power supplied to the discharge lamp aη via the transistor inverter (4).

The discharge lamp a9 is substantially turned off.

In this embodiment, the power supplied to the discharge lamp (17+) is limited by reducing the pace current of the transistor/transistor 15+ (6) of the transistor inverter (-41). A three-terminal thyristor (to) provided between the negative terminal of the resistor ae and the negative terminal of the power source 11), a resistor provided between the gate and cathode of this thyristor (-), and this resistor
A series circuit with a Zener diode (support) installed in the K-row and a resistor, and a diode acit on both ends of this resistor.
The input terminal C9D is provided through the input terminal C9D and corresponds to the output terminals A and BK of the detection device 0. When the detection signal from such a control circuit mri and the detection device is lost, the Zener diode (to) is turned off, so the three-terminal thyristor (to) cannot be turned off, and the detection signal from the detection device is The three-terminal thyristor turns on only when the signal is input.

Therefore, in this case, the transistor inverter 14)
transistor (5).

The pace current circuit of (6) is short-circuited and the transistor (5)
1, (61) has its base voltage R,t-reduced, becomes inactive, and no longer outputs a high frequency voltage.

Next, the action tWR1111 is performed. Now, if the discharge lamp a9 is lit normally, the fifth
The voltage shown in Figure 87 is generated. This voltage is close to a symmetrical sine wave, and the peak value is also low.
The voltage waveform appearing at both ends of L@ is a pulsating voltage with a very small pull as shown in Figure 185(a)K. Therefore, since the 9 pull is very small vh.

The current flowing through the resistor @ through the capacitor yt- is also small, and therefore the voltage generated across the resistor, that is, the voltage between the output terminals A and 8, becomes a very low voltage. Follow-)
Lower side, depending on the input of the knowledge device, the discharge lamp a
It does not output a detection signal indicating that η is in a half-wave discharge state.

Next, when a discharge lamp (17+ is installed and %A is not loaded).

The output of the detection winding (to) is as shown in FIG. 5(b). Although this voltage has a high peak value, it has a waveform close to a symmetrical sine wave, so the voltage generated across the resistor (c) is a pulsating voltage with a small ripple as shown in Figure 5 (t4). Also, the frequency component of the ripple is low.Therefore, the electric current ft flowing through the capacitor tube to the resistor (to) is small, and therefore the voltage generated between output terminals A and 8 is low. Therefore, the detection device 1121 will not output a detection signal indicating that the discharge lamp aη is in a half-wave discharge state in response to an input such as 16 Next, when the discharge lamp node causes a half-wave discharge, The discharge current flows only for the half wave of the lamp Kt1, and the inverter transformer (7) 2
The next winding Il becomes biased W1, and the detection winding #i! The output Fi of (c) is as shown in FIG. 5(C). FIG. 5 1c) K and a are peak voltages due to half-wave discharge, and such peak voltages contain high-frequency components compared to a normal sine wave. (For example, if the sine wave in Figure 5(a) is (41KH)
g, whereas the peak voltage was 130 KHz. Therefore, both ends of the resistor have a fast rise as shown in Fig. 5 (tC)rc.

A pulsating voltage with a large pull is generated. Since the ripple is large and the 111m number component is high, the current flowing through the capacitor to the resistor is large.

The voltage generated across the resistor (to), that is, between the output terminals A and 8, is extremely large compared to when the discharge lamp aη is normally lit or when there is no load. The detection device 15 outputs this voltage as a detection signal from output terminals A and B. The control device +21 receives this detection signal and extracts the signal with the higher polarity of the detection signal, which is an alternating current signal, through a diode (to) and a resistor 1311.
A Zener diode (to) is connected to the voltage generated across 111.
level aS.

It is applied between the gate and cathode of the three-terminal thyristor (to) to turn on the thyristor cMJt-. Due to this.

Transistor (5) of transistor inverter 14).

In (6), the pace current circuit is short-circuited, and the transistor inverter (4) cannot output a predetermined output (the 0° discharge lamp surface is substantially lit by VC#I. Note that in this embodiment, Since the power supply 1 outputs pulsating DC voltage,
The three-terminal thyristor turns off every half cycle.

Therefore, the discharge lamp A is powered at - at the beginning of each half cycle, but a discharge lamp is detected and the lamp is turned off.

There is no problem. You can also control the control device if necessary! ! ! It is also easy to maintain the functionality. In other words, by installing an appropriate capacitor at both ends of a three-terminal thyristor, it is possible to keep the thyristor turned on, but when a discharge lamp in a half-tjR discharge state is converted into a normal discharge lamp, The above-mentioned embodiment is preferable, considering the drawback that - the power supply must be turned on and then turned off.

Next, the experimental results according to this example are shown in FIG. 6th
In the figure, the horizontal axis is the input voltage of the power supply, expressed as a ratio to the rating, and the vertical axis is the output terminal A of the detection device @,
Indicates the voltage of Moreover, in FIG. 6, when the 0 curve Arj discharge lamp is lit normally, the discharge lamp is attached to aSS and there is no %A.

In the case of a seasonal load, the first case is the case where the discharge lamp is in the Ushiwa discharge shape. As is clear from FIG. 6, it can be detected that the condition is clearly true under any conditions when there is a free discharge. It is at a detection level.

FIG. 7 shows another embodiment of the invention.

Only the main parts are shown, and the other parts are omitted because they are the same as in FIG. 4, but the control device CIS of this embodiment limits the input to the transistor inverter +4).

In other words, the #! I! installed between the three-terminal thyristor 1 and the output terminal of the rectifier (3). A gate circuit of a first three-terminal thyristor consisting of a series circuit of a diode (1), a diode (2) and a resistor (9).

The anode of the @2 diode (to) and the first
# provided between the cathode of Saisister! 2, the cathode of the first diode (support) of this thyristor (41), and the second thyristor (41).
A capacitor provided between the cathodes of 411 and 411 is
It consists of Such a control device (15) controls the ON/OFF state of the three-terminal thyristor #Il based on the detection signal of the bob detection device shown in FIG. 7. When there is no detection signal, the second terminal is turned on and the Irista tune is turned on.

As a follower, the first three-terminal thyristor aI is turned on at a given phase by the gate circuit. On the other hand, when a detection signal is input, the second three-terminal cyrus □ returns (41 is
(,, Since the gate and cathode of the thyristor of jiIl are short-circuited, the first thyristor CI[I cannot be turned on after the next half cycle. Note that the capacitor 14
1riII! This is to keep the thyristor tune No. 2 on.

As described above, in this embodiment, the input power of the transistor inverter 14) is reduced to limit the power supplied to the discharge lamp, thereby turning off the discharge lamp. In addition, this example Kt? If the lamp is converted to a normal discharge lamp, it is necessary to turn on the m-power source. The other functions are the same as those of the fourth illustrated embodiment, so their explanation will be omitted.

Note that the present invention is not limited to the above-mentioned embodiments, but may be modified as appropriate within a range without changing the gist. For example, in the above embodiment, a pulsating current power source is used for the electric current IIjI, but in the case of a smoothed DC power source, the detection σζ and I/c values are easy to detect. In addition, the high-frequency emitting wax has a transistor inverter and outputs a high-frequency voltage.

It may be possible to use a thyristor inverter or the like to generate a high frequency voltage, and the control** can be freely designed by combining semiconductor switching elements, etc.

When the discharge lamp becomes a half-wave discharge lIK, it may be installed in any position as long as it can produce a total of 14 Kf. The method of connecting discharge lamps in series can also be applied when lighting them in parallel.

As described above, according to the present invention, it is possible to reliably detect the Ushiwa discharge state of the discharge lamp, and the discharge lamp is not left in the Ushiwa discharge state suddenly, and the circuit that is constantly generating heat can be detected. It is possible to provide a discharge lamp lighting device that can prevent inconveniences such as damage to parts and damage to lamp pulp.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional discharge lamp lighting system, Fig. 2 is a tube voltage type of the discharge lamp, Fig. 3 is an explanatory diagram of discharge lamp breakdown that occurs in a conventional device, and Fig. 4 is a diagram of the discharge lamp according to the present invention. A circuit diagram showing one embodiment, FIG. 5 is a voltage waveform diagram to clarify the effect of the one shown in FIG. 4, FIG. 6 is a 1w diagram showing experimental results, and FIG. FIG. 2 is a circuit diagram showing a main part of the embodiment. (Su...Power supply, (4)...Transistor inverter, Ding...Discharge lamp, I5-...Detection device, (To)...
・Detection winding, 21° (to)...control device. Note that -1%/-h in the same line number in Figure 9 indicates a corresponding portion. Representative agent Shin Kuzuno −

Claims (1)

[Claims] A) a high-frequency generator supplied with power from a power source to energize a discharge lamp, a detection device for detecting that the discharge lamp is in a half-wave discharge state, and a detection device for this detection device. A controller for substantially stopping energization of the discharge lamp by the high-frequency generator in response to a signal. (2) The detection device includes a detection inspection line, a rectifier that rectifies the output of the inspection rectangular winding edge of C, and Kl! between the output terminals of this rectifier. A patent claim characterized in that it has a resistor connected in series, a series circuit of a capacitor and a second resistor connected in parallel with the first resistor, and output terminals across the second resistor. The discharge lamp lighting device according to item 1. 13) The control device receives as input a voltage of the polarity of the asymmetric AC voltage generated across the second resistor in a half-discharged state of the discharge lamp, which has a larger amplitude. Range 1st JJ! The discharge lamp lighting device according to item I or II. +4) The high frequency generator has a 9-cage transformer type output transformer, and the detection winding of the detector is connected to the secondary ll! of the output transformer. Claim 111 Tanning No. 3 xj
4. The discharge lamp lighting device according to any one of 4. (5) ZLIK according to claim 1, characterized in that the high frequency generator t is a transistor inverter.
The discharge lamp lighting device according to any one of Item 4. (6) The discharge lamp lighting device according to claim (5), wherein the control device *rz limits a base current of a transistor of the transistor inverter. (7j) The control device is characterized in that it provides an input to the transistor inverter.
- A discharge lamp lighting IF device according to claim (5).