JPS58201296A - Method of firing discharge lamp and high voltage 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 relates to a discharge lamp lighting method in which a high-pressure discharge lamp is initially started and/or restarted using a high frequency and high voltage, and a crystal pressure relief lamp suitable for this lighting method.

When a high-pressure discharge lamp is operated using a commercial power source, a discharge lamp 3 is generally connected to a commercial AC power source 1 via a current-limiting choke 2, as shown in FIG. However, in sodium lamps and some metal halide lamps, the discharge lamp 3 is connected in parallel with the starting means 4.

Although various types of starting means 4 have been proposed, the present applicant has previously proposed a boost inductor 6 and a bidirectional two-terminal silicon risk (hereinafter simply referred to as We proposed the use of a boost oscillator circuit 5 in which 7 series circuits (called thyristors) are connected in parallel.

However, once a high-pressure discharge lamp is started and turned on, the temperature of the arc tube reaches several hundreds of degrees Celsius, and the vapor pressure inside the tube is extremely high.For this reason, even if you try to restart the lamp immediately after turning it off, the restart voltage will be extremely low. This makes instant restarts difficult or impossible in many cases, and if you try to restart the lights immediately after they go out, you will need very high voltages. This makes it difficult to configure parts due to insulation problems, and even if it were possible, there would be strict regulations regarding insulation between wires and between wires and metal parts, withstand voltage, etc., and there would be risks such as electric shock. Moreover, each component of the starting means 4 is extremely large and expensive.

Therefore, the main object of the present invention is to provide a method and method for lighting a high-pressure discharge lamp that is not only capable of initially starting a high-pressure discharge lamp but also restarting the lamp instantaneously or in a shorter time after extinguishing, which also allows the starting means to be miniaturized, and which is safe. An object of the present invention is to provide a high-pressure discharge lamp suitable for this lighting method.

To summarize this invention, the invention described in the first claim converts a commercially available low-frequency AC voltage into a high-frequency voltage, boosts this high-frequency voltage, and applies it to the starting aid means of a high-pressure discharge lamp. The present invention is characterized by a method for lighting a discharge lamp.

The second aspect of the invention includes an outer tube, an arc tube housed in the outer tube, a starting aid for the arc tube, and a base mounted on a socket.
The present invention is characterized by a high-pressure discharge lamp in which at least part of the components of a high-frequency voltage boosting means is built-in, and the high-frequency high voltage boosted by the high-frequency voltage boosting means is applied to the starting assisting means.

Hereinafter, an example of the present invention will be explained with reference to the drawings.

FIG. 3 shows a circuit diagram of a discharge lamp lighting device based on the discharge lamp lighting method of the present invention. In the figure, l.

11 is a high frequency block current limiting means for blocking high frequency voltage and limiting the low frequency lamp current; 12 is energized by the low frequency alternating current 10 via the high frequency blocking current limiting means 11; 13 is a high-frequency voltage booster that boosts the high-frequency voltage generated by the sub-frequency voltage #12; 14 is a high-frequency voltage booster boosted by the high-frequency voltage booster 13; First start, restart or low frequency AC 113
This is a high-pressure discharge lamp that is re-ignited every half cycle, and has an arc tube 15 filled with rare gas, metals such as mercury and sodium, and gases such as halides. In addition to the electrodes, it is equipped with a starting auxiliary means 16 such as a nearby conductor or a starting auxiliary electrode, and furthermore, a high frequency voltage boosting means 13 is built in outside the arc tube 15.
The output voltage of the high frequency voltage boosting means 13 is applied to the starting assisting means 6.

That is, 1. This invention does not step up the entire low-frequency AC voltage as it is, but first converts it into a high-frequency voltage and then steps up this -frequency voltage. Rather than boosting the voltage to the initial starting and/or restarting voltage, the arc tube is provided with a starting aid in addition to the main electrode, and the boosted high-frequency voltage is used as the starting aid! This makes it possible to instantly restart mercury lamps, sodium lamps, etc., and even metal halide lamps, which are generally considered difficult or impossible to restart instantly, to be restarted more reliably in a shorter time. This is what I did.

FIG. 4 shows a circuit diagram of a specific embodiment of FIG. In the figure, the high frequency block current limiting means]-] is composed of a single choke coil. Further, the high frequency power supply 12 includes a boost oscillation circuit 8 formed by connecting a series circuit of a boost inductor 6 and a thyristor 7 in parallel to an oscillation capacitor 5, similar to the starting means 4 shown in FIG. however,
The output voltage is not high enough to restart the discharge lamp 14 instantaneously after initial startup or extinguishment. Further, the high-frequency voltage boosting means 13 is constituted by a series resonant circuit that resonates with the output frequency of the high-frequency power supply 12, including an inductor 17 and a capacitor 18, for example. Further, in addition to the main N poles 19 and 20, the arc tube 15 of the discharge lamp 14 is provided with a nearby conductor as an example of the starting aid means 16.
The output voltage of the crystal capacitor 12 is the main electrode 19.20 (C
The potential at the connection point between the inductor 17 and the capacitor 18 constituting the high-frequency voltage boosting means 13 is applied to the adjacent conductor 16 .

The discharge lamp 14 is, for example, a high-pressure IJ lamp. As shown in FIG. are arranged and housed in an outer tube 21 made of isthmic glass, and a screw base 22 is fixed to the lower end of the outer tube 21. In addition to connecting the
The other one electrode 20 is connected to the center terminal 23 which is insulated from the screw base 22. Further, a series circuit of an inductor 17 and a capacitor 18 constituting the high frequency voltage boosting means 13 is connected between the screw base 22 and the center end f23.

In the two-set configuration, when the low frequency AC power source 1o is connected, the oscillation capacitor 5 is charged via the choke coil 11, and when the terminal voltage reaches the breakover voltage of the thyristor, the thyristor 7 becomes conductive. Due to the cooperative action of the oscillation capacitor 5 and the boost inductor 6, the boost oscillation operation is fully started, and a high frequency high voltage is generated across the oscillation capacitor 5. Since this high frequency high voltage is applied to the high frequency voltage boosting means 13, the inductor 17 and the capacitor 18 resonate in series to boost the high frequency high voltage and apply it to the starting assisting means 16 of the arc tube 15. As a result, the arc tube 15 starts. When the arc tube 15 starts and changes from glow discharge to arc discharge, its internal impedance becomes small, the thyristor 7 is short-circuited and turned off, and the high frequency 'fIL#12 stops the boost oscillation operation. After this,
As time passes, the vapor pressure of the arc tube 15 increases, and its light output also increases accordingly, and when the vapor pressure stabilizes, the light output also stabilizes.

Now open the power switch (not shown) and discharge lamp 14.
When you turn off the light and turn on the power switch again, high frequency power supply 1
2 and the high-frequency voltage boosting means 13 are activated, and the raised high-frequency high voltage is applied to the adjacent conductor 16. If this high-frequency high voltage is made higher than the re-intellectual voltage, the arc tube 15 It can be restarted instantly or even more quickly after being turned off. Therefore, the conventional general oscillation circuit has a sixth
As shown by the curve 1 indicated by the dotted line in the figure, the load supplied power decreases as the load increases, whereas the boost oscillator circuit 8 shown in the embodiment is shown by the curve 2 indicated by the solid line in FIG. In addition, since the load supply cylinder has a characteristic that the force increases as the load increases, a large amount of energy can be supplied to the arc tube 15 at the time of initial starting and/or restarting, and it is easily brought out of the glow discharge state. It becomes possible to transition to the arc discharge state.

As described above, according to the embodiment shown in FIG.
2 converts a commercial AC power supply voltage of, for example, 60 Hz and 100 V into a high frequency of several tens of KHz and a voltage of several hundred V or more, and converts this high frequency voltage into high frequency voltage boosting means 1.
If the voltage is increased to, for example, several thousand volts at Step 3, a mercury lamp or a sodium lamp can be easily and reliably started for the first time and/or instantaneously restarted. Further, even metal halide lamps, which have conventionally been difficult or impossible to restart, can be restarted in a shorter time. Moreover, since the high frequency power supply 12 does not suddenly raise the voltage to a high voltage of several thousand volts, high voltage wiring can be avoided. In addition, the high-frequency voltage boosting means 13 can significantly reduce the size of the inductor 17 and capacitor ]8 compared to the case where the low-frequency voltage is boosted. Therefore, compared to simply applying a high frequency high voltage between the main electrodes 19.2Q of the arc tube 15, it is possible to easily and reliably operate a discharge lamp such as a metal halide lamp with a smaller high frequency high voltage. Starting and/or
Or it can be restarted, high frequency voltage boosting means 1
The inductor 17 and capacitor 18 of No. 3 can also be made smaller accordingly. Furthermore, as shown in the illustrated example, if the inductor 17 of the high-frequency voltage boosting means 13 is connected avoiding the lamp current path of the arc tube 15, the current capacity of the inductor 17 can be significantly reduced, and not only the size can be significantly reduced. , higher voltage can be obtained. In particular, high frequency power supply 1
When 2 is configured with a boost oscillation circuit 8, the oscillation output frequency is about several tens of kilohertz, but since the oscillation output waveform is sawtooth waveform and includes harmonics, the high frequency voltage boosting means 13 is configured as a high-order harmonic. If the inductor 17 and the capacitor 18 are configured to resonate in series with each other, there is an advantage that the inductor 17 and the capacitor 18 can be further miniaturized. In addition, if the output voltage of the high-frequency electric currents 1 and 12 is kept to a relatively low voltage of several hundred volts or less, it is easy to insulate and withstand voltage between the wiring in the appliance and between the wiring and the metal parts, and it becomes less expensive. This also eliminates the risk of electric shock. In addition to the main electrodes 19 and 20, the arc tube 15 also includes a starting assisting means 1.
6, the discharge lamp 14 can have a two-end E structure with a screw base 22 and a central terminal 23. Furthermore, the -frequency voltage boosting means 13 is connected to the discharge lamp 1.
Since the discharge lamp 14 is built into the screw base 22 of No. 4, it is safe because high frequency and high voltage will not be generated unless the discharge lamp 14 is attached to a socket (not shown).

Although a single choke coil is shown as the high frequency block current limiting means 11, a leakage transformer may be used, or in some cases, it may be configured with a series circuit of an incandescent filament and a high frequency block coil. If the boost oscillator circuit 8 is configured with a positive bias winding m6 on the inductor 6
The positive bias winding 61 may be connected in series with the oscillation capacitor 5 to obtain the desired high frequency and high voltage with a smaller boost inductor.

In addition, an intermittent oscillation capacitor 9 is connected in series to the series circuit of the boost inductor 6 and the thyristor 7 or in six series to the boost oscillation circuit 8, so that the high frequency voltage generation period of the high frequency power supply 12 is controlled by each half cycle of the AC power supply voltage. It is also possible to run only at the beginning of each session. In such a case, the high frequency power source 12 can be made smaller and cheaper, and power loss can be reduced.

Further, the electric potential at the connection point of the inductor 17 and capacitor 18 of the high-frequency voltage boosting means 13 is kept unchanged at the arc tube 14.
Although the case where the voltage is applied to the starting assisting means 16 has been described, it may also be connected through a capacitor to cause capacitive discharge destruction of the arc tube 15. Or inductor 1
7 may be provided with a secondary winding for boosting the voltage to further boost the terminal voltage of the inductor 17 before applying it to the starting assisting means 16vc. Further, only one of the inductor 17 and the capacitor 18 may be built into the discharge lamp 14, or not only the high frequency voltage boosting means 13 but also at least a part of the high frequency power source 12 may be built into the discharge lamp 14. .

Further, in the embodiment, the one-frequency voltage boosting means 13 has been described as a series resonant boosting circuit, but it goes without saying that direct conversion can be performed with other boosting means such as a transformer structure within the range that produces the same effect.

As described in 11 below, this invention provides a low frequency alternating current 'rM source'W1.
The voltage is converted into a high-frequency voltage, and this high-frequency voltage is boosted and applied to the starting aid means of the arc tube of the high-pressure discharge lamp, so a low-frequency high voltage or a single-frequency high voltage can be applied between the main electrodes of the arc tube. Initial starting and/or restarting of the high-pressure discharge lamp can be performed more reliably and in a shorter time with a lower high voltage than in the case where the lamp is used. Furthermore, since at least some of the components of the high-frequency voltage boosting means are built into the high-pressure discharge lamp, insulation between wirings or between wirings and metal members is achieved.

It has the advantage that withstand voltage can be easily established and there is no danger of electric shock.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram for explaining a general method of lighting a high-intensity discharge lamp, Figure 2 is a circuit diagram for explaining a method of lighting a high-intensity discharge lamp, which is the background of this invention, and Figure 3 is a circuit diagram for explaining a general method of lighting a high-intensity discharge lamp. is a basic block circuit diagram for explaining the lighting method of a high-intensity discharge lamp according to the present invention, FIG. 4 is a circuit diagram of a specific embodiment of FIG. 3, and FIG. 5 is a diagram according to the lighting method of the present invention. FIG. 6 is a schematic configuration diagram showing a partial cross-section of an example of a high-intensity discharge lamp, and FIG. 6 is a characteristic curve diagram of load versus load supply power depending on the type of high-frequency power source. 10... Low frequency AC power supply, 11... High frequency block current limiting means (single choke coil), 12... High frequency power supply, 13... High frequency voltage boosting means, 14. High pressure discharge lamp, 15. ... emission, light tube, 16 ... starting aid means, 22 ... base. Figure 1 Figure 2 Figure 4 Figure 5 Figure 4

Claims (2)

[Claims] (1) A low frequency AC 11 source, a high frequency block current limiting means, a high frequency IT source energized by the low frequency AC power source via the high frequency block current limiting means, and a high frequency source that boosts the high frequency voltage of the high frequency power source. On the voltage boosting means, a high frequency high voltage boosted by the high frequency voltage boosting means is applied.
``Equipped with all starting aids including an electric power lamp,
A discharge lamp lighting method, characterized in that the discharge lamp is initially started and/or restarted using the boosted high-frequency vehicle 1''E. (2) Comprising an outer tube, an arc tube housed in the outer tube, a starting aid for the arc tube, and a base that is attached to a socket, and includes at least some components of a high-frequency voltage booster. A high-pressure discharge lamp characterized in that a high-frequency high voltage boosted by a high-frequency voltage boosting means is applied to the starting aid y.