JPS58115751A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To improve starting performance of a discharge lamp by a method wherein an electron radiating substance is sticked to either of a pair of main electrodes and auxilliary electrodes standing closely to each other while both main electrodes are connected with an AC power source through a current-limit element including a condenser. CONSTITUTION:Both main electrodes 30 and 31 of a luminous tube 3 being concurrently a discharge lamp are connected with both ends of an AC power source 1 throug a serial circuit of a choke coil 2 and a condenser (C) 6, while adjacent to one main electrode 30 an auxiliary electrode 32 is provided to the other main electrode 31 through a resistor 4 being concurrently auxiliary impedance. Then the luminous tube 3 and the resistor 4 form the discharge lamp 5. Further the emitters 7 and 7, which are electron radiating substances, are applied to the main electrodes 30 and 31. In this way, in addition to a starting assisting effect owing to minute discharge between the main electrodes and the auxiliary electrodes, the terminal voltage of C6 to be obtained owing to a rectifying action between both electrodes overlaps the power source voltage to be impressed upon the discharge lamp thus being able to remarkably improve starting performance of the discharge lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a discharge lamp lighting device, and an object of the present invention is to improve the starting performance of a discharge lamp.

1g shows a conventional discharge lamp lighting device, in which a discharge lamp 311s arc tube 3 is connected to both ends of an AC power source 10 through a choke coil 2 which is a, i*us,
sl is connected, and an auxiliary pole is provided close to one main pole (capital) and connected to the other main pole 31 via a resistor 4 serving as an auxiliary impedance. The arc tube 3 and the resistor 4 form a discharge lamp 5.

In such a lighting device, when a power supply voltage is applied between the main electrode and the auxiliary electrode 32, a slight discharge first occurs between these two electrodes, and then a main discharge occurs between the main electrode and the auxiliary electrode 31. occurs, and since the main electrode and the auxiliary electrode are close to each other, a slight discharge starts easily, and the starting performance of the arc tube 3 is superior to that of one without an auxiliary electrode. .

However, since a resistor for voltage transmission is inserted in series with the auxiliary ultra-fine electrode, a voltage drop occurs across the resistor 4 due to the micro-discharge current between the main mao and the auxiliary electrode s2. Immediately after starting, the voltage applied between the main electrodes and between the auxiliary electrodes decreases, making it difficult for the arc tube 3 to transition to main discharge, and in the end, the starting performance cannot be said to be sufficient.

The present invention has been made in view of the above-mentioned drawbacks, and provides a discharge lamp lighting device with even better discharge lamp starting performance.

Fig. 2 shows an embodiment of the present invention, in which the current limiter is constructed by a series circuit of a choke coil 2 and a capacitor 6, and an emitter 7.7, which is a 31g electron radioactive material, is applied between the two electrodes. The configuration is different from the conventional one in that it is
I'm doing C.

The emitter 7 facilitates discharge by emitting electrons, and is often used in fluorescent lamps, etc. In the above embodiment, when the polarity of AC type #1 is as shown in the diagram, When inputted, a power supply voltage is applied between the main electrode and the auxiliary electrode 32 of the arc tube 3 via the choke coil 2, the capacitor 6, and the resistor 4, and the emitter 7 emits electrons toward the auxiliary electrode 32. Therefore, resistor 4, auxiliary pole 3
2. A slight discharge current flows between the main pole pieces, through the capacitor 6, and the choke coil 2, and the illustrated polarity charge is accumulated in the capacitor B. When the polarity of the AC power supply 1 is reversed, the emitter 7 is not coated on the auxiliary mu, so the main pole is separated,
The dry capacity of the auxiliary electrode is equivalent to that of a diode in the reverse direction, and during this period, slight discharge is less likely to occur than in the first half of the cycle, and the terminal voltage of the capacitor 6 is superimposed on the power supply voltage, and the voltage between the main MGO and the auxiliary electrode 32, as well as between the main poles and the main It is applied between the poles 31.

Repeating this operation, the main pole (capital) and the auxiliary pole 321&t
With the help of the slight discharge of l and the terminal voltage of capacitor B, the light emission ts is easily started and lit.

However, the emitter 7 in the main pole example is not necessarily necessary, and the same effect can be obtained by applying the emitter 7 to the auxiliary pole 32 instead of the main pole.

FIG. 3 shows another embodiment of the present invention, in which an AC power source 1
A phase control element 8 is inserted in series on the side.

In this embodiment, since the LCR most active current flows at a low level through the capacitor 6, choke coil 2, resistor 4, and phase control element 8, a higher capacitor voltage can be obtained, and the arc tube 3 can be started. Performance will further improve. Reference numeral 9 in the figure indicates a control section of the phase control element 8.

In each of the above embodiments, the light emitting w3 housed in the discharge lamp 5 is described as a discharge lamp, and the resistor 4 is also described as a discharge lamp 5.
However, this does not limit the structure of the discharge lamp and the auxiliary impedance.

As mentioned above, the present invention has a limited current requirement at both ends of an AC power source.
Connecting the ampholytic poles of the discharge lamp via Ic8,
In a discharge lamp lighting device, an auxiliary pole for starting a discharge is provided in close proximity to at least one main pole of the discharge lamp and is connected to the other main pole via an auxiliary impedance,
The discharge lamp lighting device is characterized in that an electron radioactive material is attached to one of the pair of main poles and auxiliary poles that are close to each other, and the current limiting element is constituted by an impedance including at least a capacitor. In addition to the start-up inertia effect caused by the slight discharge between the main and auxiliary poles, the terminal voltage of the capacitor obtained by the free current action between the two poles is superimposed on the power supply voltage and applied to the discharge lamp. The starting performance of the engine was significantly improved.

[Brief explanation of the drawing]

FIG. WN2 is a circuit diagram showing a conventional example, and FIGS. 2 and 6 are circuit diagrams showing different embodiments of the present invention. 1... AC power supply, 6... Arc tube, 30, 31...
Main pole, 32...M auxiliary pole, 4...Resistor, 6...Capacitor, 7...Emitter. Patent applicant Matsushita Electric Works Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Claims] (1) Amphopoles of the discharge lamp via Kffl flow elements at both ends of the AC power supply! In a discharge lamp lighting device comprising a small number of discharge lamps (both of which are provided with an auxiliary pole for starting discharge that is close to one of the main poles and connected to the other main pole via an auxiliary impedance, Gζ A discharge lamp lighting device characterized in that an electron radioactive substance is attached to one of the pair of adjacent main electrodes and auxiliary electrodes, and the current limiting element is constituted by an impedance including at least a capacitor.