JPH0714685A - Electric discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To reduce the amount of currents while an electric discharge lamp can move freely by connecting specific two wire cores to a fixed power source, and by connecting the wire core of the Kth wire of one end part of an electric wire to the wire core of the (K-1)th wire of the other end part. CONSTITUTION:The wire core 2-a in one end part A of an electric wire 2 and the wire core 7-c of the other end part B are connected to the output terminal of a fixed current source 6, while the wire core 2-b of the end part A is connected to the wire core 7-b of the other end part B. The wire core 2-c of the end part A is directly connected to the wire core 7-a of the other end part B, and a toroidal core 1 is penetrated by the output current of the fixed current source 6 through each wire core. When the current of the output line 2 is increased, the core 1 is saturated, and a voltage V0 is induced in the terminal of a coil 3. When the voltage V0 exceeds the electric discharge starting voltage of the electric discharge lamp 4, the electric discharge lamp 4 is lighted. The voltage generated by the coil 3 depends on the number N2 of winding of the coil 3. When the wire cores are connected in the abovementioned manner, the number N2 of turns is increased. The amount of current run under a condition where the electric discharge lamp 4 can move freely, is reduced, while the electric discharge lamp 4 can be lighted at high wattage.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device in which the output current of a constant current source in a discharge lamp that lights without a wire is reduced.

2. Description of the Related Art A discharge lamp lighting device of this kind having no connection is known. The outline will be described with reference to FIGS. 2 and 3.
In FIG. 2, an annular core 1 made of a grain-oriented silicon steel plate or a ferrite material is loosely inserted into an electric wire 2 connected to a constant current source 6 that outputs a constant AC power source, and the electric wire 2 is freely moved along the electric wire 2. It can be moved. The coil 3 is many times (for example, 30 turns) in the annular core 1.
It is wound and its both ends are connected to the respective electrodes 5 of the discharge lamp 4. Before the discharge lamp 4 starts to discharge, the load current does not flow through the coil 3 and thus the current I ₀ flowing through the electric wire 2
Is increased and becomes larger than a certain degree, the above-mentioned annular core 1
Is saturated. Due to the saturation of the annular core 1, the high voltage V ₀ shown in FIG. 3 is generated at the terminals of the coil 3, and the generated high voltage V ₀ causes the discharge lamp 4 to start discharging. The discharge lamp 4 that started to discharge has the current flowing through the electric wire 2 and the coil 3
Current I ₀ / n (n is the coil 3)
The number of windings becomes a current flowing through the discharge lamp 4, and the lighting is continued.

In the above prior art, when the discharge lamp 4 is a discharge lamp having a long discharge length, that is, a discharge lamp having a large lamp power, the coil 3 is used to discharge the discharge lamp 4. It is necessary to generate a large voltage across both ends. As a method of increasing the voltage V ₀ , there is a method of increasing the number of turns n of the coil 3, but if the number of turns n is increased, the current flowing after the discharge lamp 4 discharges is I.
_Since there is a need for ₀ / n, there is a problem that the current I ₀ flowing through the electric wire 2 must be increased in order to secure the rated lamp current. The current I ₀ is about 17 A when FL40 is used for the discharge lamp with n = 40 turns (T). Further, as a method of lowering the current I ₀ flowing through the electric wire 2, the electric wire 2 loosely passing through the annular core 1 is passed through the annular core 1 again, and the number of windings of the electric wire 2 is not one but a plurality of turns. However, this method has a problem in that the advantage of the connectionless lighting fixture that the discharge lamp 4 can be freely moved is lost. An object of the present invention is to obtain a discharge lamp lighting device that reduces a current I ₀ flowing through an electric wire in a state where a discharge lamp can be freely moved.

The above-mentioned object is to allow an electric wire through which a constant current flows to pass through a toroidal core around which a coil is wound, and directly connect both ends of the coil to both electrode terminals of a discharge lamp. In a discharge lamp lighting device in which a discharge is started by a voltage generated between electrode terminals, an N wire core is used as the wire, and the first wire core at one end of the wire and the N wire at the other end
The second core is connected to the output end of the constant current source, and the cores other than the above are the k-th core (k represents 2 to n) at one end of the wire and (k-1 ) Th core with the direct or short-circuit line.

In the discharge lamp lighting device of the present invention, the electric wire having N cores is loosely inserted into the toroidal core around which the coil is wound, and the first core and the other end of the electric wire at one end are connected to each other. The N-th core is connected to the output end of the constant current source, and the cores other than the above are k-th (k is an integer representing 2 to n) core at one end of the wire and (k at the other end). Since the -1) th wire core is connected directly or by using a short-circuit wire, the wire penetrates the toroidal core N times as a wire in which one wire core is connected, and the output terminal of the constant current source. Will be connected to. Therefore, even if the number of turns of the coil is increased, the current I ₀ for ensuring the discharge current can be reduced, and moreover, the respective wire cores are connected at both ends of the wire having N wire cores. Therefore, the feature of the connectionless discharge lamp lighting device capable of freely moving the discharge lamp can be maintained.

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a discharge lamp lighting device according to the present invention, FIG. 3 is a diagram showing voltage waveforms generated at both ends of a coil wound around a toroidal core, and FIG. 4 is a diagram showing generated voltage V ₀ with respect to current I ₀ . FIG. 5 is a diagram showing changes, and FIG. 5 is a diagram showing changes in the discharge lamp current I ₂ with respect to the current I ₀ . In FIG. 1, a toroidal core 1 made of a ferrite material is loosely fitted and inserted into an electric wire 2 connected to a constant current source 6 that outputs a constant current.
The toroidal core 1 is provided with a coil 3 many times (for example, 40
Turn) and both ends thereof are connected to each electrode 5 of the discharge lamp 4. The electric wire 2, the coil 3, the electrode 5 and the connecting portion thereof are completely covered with an insulating member so that the conductive portion is not exposed at all. Here, the electric wire 2 is
For example, it is an electric wire having three cores, and a cabtire cable having three cores is one example. The wire core 2-a at one end A of the wire 2 and the wire core 7-c at the other end B are connected to the output terminal of the constant current source 6, and the wire core 2-b at the end A is connected to another. The wire core 7-b at the end B and the wire core 7-b at the end A
c is connected to the wire core 7-a of the other end B by using a short-circuit wire, and the output current of the constant current source 6 penetrates the toroidal core 1 three times through each wire core. Next, the operation of this embodiment will be described with reference to FIGS. 3, 4, and 5. In FIG. 1, when the discharge lamp is not discharging, the load current does not flow through the coil 3, and when the current flows through the output line 2 and becomes larger than a certain amount, the toroidal core 1 is saturated and the coil 3 is discharged. A voltage V ₀ as shown in FIG. 3 is induced at the terminals. The voltage V ₀ increases as the output current I ₀ of the constant current source 6 increases, and when the output current I ₀ becomes equal to or higher than the discharge start voltage of the discharge lamp 4, the discharge lamp 4 starts discharging and lights. In FIG. 4, a toroidal core having an outer diameter of 25 mm, an inner diameter of 15 mm and a width of 12 mm is used, and when the frequency of the output current I ₀ of the constant current source 6 is 20 kHz, the coil 3 with respect to the output current I ₀ is the change in the voltage V ₀ generated between terminals is obtained by measuring the number of turns N ₂ of the number N ₁ and the coil 3 of the center line of the wire 2 through the toroidal core 1 as a parameter. Based on this data, the voltage V ₀ generated between the terminals of the coil 3 is N, which is the number of wire cores passing through the toroidal core 1.
It depends on the number of turns N ₂ of the coil 3 rather than _1, and it can be seen that it is necessary to increase the number of turns N ₂ of the coil 3 in order to increase the voltage V ₀ in order to turn on the discharge lamp of high wattage. . When the discharge lamp 4 starts to discharge, current _I 0 / _{N 2} that is determined by the number of turns _{N 2} current _{I 0} and a coil 3 which flows through the electric wire 2
Flow into the discharge lamp 4 and the lighting state is maintained. FIG. 5 shows the change in the current I ₂ flowing through the discharge lamp with respect to the current I ₀ when the discharge lamp 4 is lit under the same conditions as the curve shown in FIG. 4, as in the case of FIG. The number N _{1 of} cores of the electric wire 2 penetrating the wire and the number N of turns of the coil 3
₂ was measured using ₂ and the parameter. From this data, if you increase the number of turns _{N 2} of coil 3 and the _N 2 = 40 turns in order to increase the starting voltage _{V 0,} when the line number of cores _{N 1} of the wire 2, _1, N 2 = 20 Double the current I ₀ to flow the same discharge current I ₂ as in the case of the turn
Is required, and when the discharge current I ₂ is 0.3 A or more,
The toroidal core 1 tends to be saturated. On the other hand, if the number of cores of the electric wire 2 is N ₁ = 3, the constant current source 6
Even if the current I ₀ of the discharge lamp 4 is set to 10 A or less, 0.7 A of the current I ₂ of the discharge lamp 4 can flow, and the current I _{0 of the} constant current source 6 can be
Generates a high voltage at the terminals of coil 3 while suppressing
Moreover, there is an effect that a necessary discharge lamp current can be obtained. Supplement the explanation. The toroidal core 1 acts as a kind of transformer having the electric wire 2 as a primary winding and the coil 3 as a secondary winding. According to the present invention, assuming that the number of turns of the primary winding by the electric wire 2 is increased from 1 to m and the primary winding current is reduced by 1 / m times, the ampere-turn due to the load current remains unchanged. is there. However, the exciting inductance increases in proportion to the square of the number of turns m, and the exciting current component decreases accordingly. Therefore, the loss due to the electric wire 2 is reduced and the conversion efficiency of the transformer is increased, which is advantageous.

As described above, in the discharge lamp lighting device according to the present invention, the toroidal core around which the coil is wound passes through the electric wire through which a constant current flows, and both ends of the coil are directly connected to both electrode terminals of the discharge lamp. In a discharge lamp lighting device which is connected and starts discharge with a voltage generated between the electrode terminals, the electric wire uses an electric wire having an N wire core, and the first wire core at one end of the wire and the Nth wire at the other end. And the core of the wire are connected to the output end of the constant current source, and the cores other than the above are k-th (k is 2
From (representing n) to the (k-1) th core of the other end by directly or by using a short-circuit wire,
Even when a high-wattage discharge lamp such as the FL40 or FLR110 is lit, a voltage V ₀ that is equal to or higher than the starting voltage of the discharge lamp is generated without increasing the current I ₀ of the constant current source, and a necessary discharge current is generated. It is possible to obtain a discharge lamp illuminator capable of lighting without connection, which can secure I ₂ .

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a discharge lamp lighting device according to the present invention.

FIG. 2 is a diagram showing a conventional discharge lamp lighting device.

FIG. 3 is an explanatory diagram showing voltage waveforms generated at both ends of a coil wound around a toroidal core.

FIG. 4 is an explanatory diagram showing changes in generated voltage V ₀ with respect to current I ₀ .

FIG. 5 is an explanatory diagram showing a change in a discharge lamp current I ₂ with respect to a current I ₀ .

[Explanation of symbols]

1 ... Toroidal core, 2 ... Electric wire, 3 ... Coil, 4 ... Discharge lamp, 5 ... Both electrode terminals 6 ... Constant current source

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[Procedure amendment]

[Submission date] August 26, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (2)

[Claims] 1. A toroidal core around which a coil is wound has an electric wire through which a constant current flows freely, and both ends of the coil are directly connected to both electrode terminals of a discharge lamp. In the discharge lamp lighting device for starting discharge, the electric wire is an N wire core, and the first wire core at one end of the wire and the Nth wire core at the other end are connected to an output end of a constant current source. However, for the cores other than the above, the k-th core (k represents 2 to n) at one end of the electric wire and the (k-1) -th core at the other end are directly or short-circuited. A discharge lamp lighting device, which is characterized in that it is connected by connecting. 2. An electric wire supplied with an alternating current having a constant current characteristic from a constant current source, a plurality of toroidal cores interlinking with the electric wire at arbitrary positions of the electric wire, and wound around each toroidal core. A plurality of discharge lamps fed from respective coils are provided, and the electric wires are made by bundling a plurality of core wires insulated from each other, and the core wires are mutually connected at a position near the output end of the constant current source. A discharge lamp lighting device, which is connected in series.