JPH07220878A - Variable choke coil and discharge lamp lighting device therewith - Google Patents

Abstract

PURPOSE:To provide a choke coil capable of simply changing inductance and a two-lamp type discharge lamp lighting circuit using the choke coil by switching the connection of terminals of the coils wound in two layers with a switching means. CONSTITUTION:A switching means is constituted of a three-contact selector switch 120, the winding end terminal 104b of the first coil 104 is connected to the common contact 122 of the switch 120, the winding start terminal 106a of the second coil 106 is connected to a switching contact 124, and a switching contact 126 is connected to an external terminal 128 respectively. When the contact 122 and the contact 124 of the switch 120 are connected, a current flows via the coil 104 and the coil 106, and the current reducing effect in the high-frequency area is increased. When the contact 122 and the contact 126 are connected, the current is short-circuited to the external terminal 128 via the coil 104 and the contact 126. When this variable choke coil is used, proper inductance can be obtained via the switching of the switch 120.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a choke coil, and more particularly to a variable choke coil whose inductance can be changed.

[0002]

2. Description of the Related Art In one electric bulb, two kinds of arc tubes are mounted in one outer bulb so that a high-luminance lamp and a low-luminance lamp can be selectively used by switching a switch. Is being done. For example, one using a mercury lamp and the other a high pressure sodium lamp or a metal halide lamp is used. In the case of a discharge lamp such as a high pressure sodium lamp, a starter for generating a high pressure pulse is incorporated in the lamp in order to facilitate the lighting operation.

FIG. 6 shows a conventional circuit configuration of a discharge lamp having such two arc tubes. In the figure, 1
A mercury lamp 12 and a high-pressure sodium lamp 14 are installed in one outer bulb bulb 10. The mercury lamp 12 and the high-pressure sodium lamp 14 are connected in parallel and further connected to an AC power supply 16. A changeover switch 1 is provided on one end side line of the mercury lamp 12 and the high pressure sodium lamp
8 and 20 are connected to each of the changeover switches 18, 2
0 is switched between contacts a and b, respectively. The contact a of the change-over switches 18 and 20 is a contact for connecting the power supply 16 to the mercury lamp 12 side, while the contact b is a contact for connecting the high pressure sodium lamp 14 side.

A choke coil 22 for adjusting the voltage is connected between the other ends of the changeover switches 18 and 20 and the AC power source 16, and the changeover switch 18 connected to the mercury lamp 12 side has the choke coil 22. Since a large current is required for lighting, it is connected to an intermediate position of this choke coil 22,
The changeover switch 20 connected to the high-pressure sodium lamp 14 side is connected to the end of the choke coil 22.
That is, the choke coil 22 is connected at an appropriate position according to each required voltage.

The high-pressure sodium lamp 14 has a starter circuit (not shown) built therein. The starter circuit includes, for example, a heat-responsive switch and an FEC (nonlinear ferroelectric ceramic capacitor) connected in series to the switch.
The starting resistance is connected to the FEC in parallel, and the starting resistance is connected to the starting auxiliary electrode 24 installed near the electrode in the high-pressure sodium lamp 14. Then, when a power source is connected to the sodium lamp 14 side, a high-voltage pulse is generated from the starting auxiliary electrode 24 to cause dielectric breakdown between the lighting electrodes of the lamp 14.

[0006]

However, in the conventional discharge lamp lighting circuit shown in FIG. 6, the changeover switch 20 on the high-pressure sodium lamp 14 side is the choke coil 22.
Is connected between the high pressure sodium lamp 14 and the high pressure sodium lamp 14. Therefore, the changeover switch 20 is changed over to the contact b side,
When a high-voltage pulse is generated from the auxiliary starting electrode 24 by the built-in starter when the high-pressure sodium lamp 14 is turned on, the high-voltage pulse is directly applied between the contact points a and b of the changeover switch 20. Therefore, the contacts of the changeover switch 20 may be impacted by this high-voltage pulse and shorten its life. In addition, there are various problems that the contact pressure must be increased to withstand such an impact.

The present invention has been made in view of the above problems of the prior art, and an object thereof is a variable choke coil whose inductance can be easily changed and a two-lamp type or dimming type using the choke coil. It is to provide a discharge lamp lighting circuit.

[0008]

In order to achieve the above object, a variable choke coil according to the present invention comprises a first coil wound around a winding frame and a second coil wound around the first coil. A coil, an insulator arranged at the boundary between the first coil and the second coil, and at least three terminals of one end of the first coil, one end of the second coil and an external terminal, and between the terminals. And switching means for performing mutual connection. Further, in the discharge lamp lighting device according to claim 2, at least one has a high-voltage pulse generation type starter, and a first arc tube and a second arc tube connected in parallel to each other, a power source, and the first arc tube. A variable choke coil that is connected between the first and second arc tubes and adjusts the voltage.

The variable choke coil is connected to the starting end side and wound on a winding frame, a first coil, a second coil wound on the first coil, the first coil and the first coil. An insulator arranged at the boundary of the two coils and a switching means for switching a current supplied from a power source between the first arc tube side and the second arc tube side are provided, and the common contact of the switching means is the first coil. The first switching contact is connected to the high pressure pulse generating arc tube via the second coil, and the second switching contact is connected to the other arc tube at the end of the.

The discharge lamp lighting device according to claim 3 is
It has a variable choke coil that is connected between the power supply and the arc tube and adjusts the voltage. The variable choke coil has a first coil connected to a starting end side and wound around a winding frame, and a second coil wound on the first coil.
An insulator arranged at a boundary between the first coil and the second coil and a switching unit for adjusting a current supplied from a power source to the arc tube are provided, and the switching unit has a common contact at a starting end of the second coil, The first switching contact is to the power supply via the first coil,
The second switching contacts are respectively connected to the power source without passing through the coil.

[0011]

According to the variable choke coil described in claim 1, since the second coil is wound around the first coil,
It constitutes one choke coil. Then, by connecting the terminal end of the first coil and the starting end of the second coil by the switching means, the first coil and the second coil are connected in series to have a large inductance, and the terminal end of the first coil and the outside are connected. By connecting the terminals, a small inductance of only the first coil can be obtained. On the other hand, according to the discharge lamp lighting circuit according to claim 2 of the present application, a high-voltage pulse-type arc tube using the variable choke coil according to claim 1,
The arc tubes driven at low voltage are to be switched.

Therefore, the high-voltage pulse generated when the arc tube having the high-voltage pulse starter is lit is not directly applied to the switching means, but is passed through the second coil once and then applied to the switching means. . Therefore, the pulse is attenuated by the second coil and the contact of the switching means is not damaged. Further, the contact pressure of the switching means can be lowered. According to the discharge lamp lighting device according to claim 3 of the present application, the variable choke coil according to claim 1 is used, and a lighting current is supplied to the lamp via the first coil and the second coil of the variable choke coil. The case of supplying (bright lighting) and the case of supplying a lighting current to the lamp using only the second coil (dark lighting) are switched.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view of a variable choke coil according to the first embodiment of the present invention. A variable choke coil 100 shown in the figure includes a winding frame 102, a first coil 104 wound on the winding frame 102, and a first coil 104.
The second coil 106 further wound around the coil 104. Then, the first coil 104 and the second coil 1
Insulating paper 108 is interposed between 06.

FIG. 2 shows a more specific winding state of the variable choke coil 100. FIG. 2A is a side view and FIG. 2B is a front view. As is clear from the figure, flanges 110a and 110b are provided at both ends of the winding frame 102. The brim 110a is provided with notches 112a, 112b, 112c for drawing out the winding ends. The winding start end 104a of the first coil 104 is led out from the notch 112a, and is wound counterclockwise in the drawing. The winding end 104b has a cutout 112.
It is derived from b.

In this state, the insulating paper 108 is adhered, the winding start end 106a of the second winding 106 is led out from the notch 112b of the brim 110a, and fixed on the insulating paper 108 by the Nomex tape 114, and further counterclockwise. Wind it around. FIG. 3 shows a state where the winding process of the variable choke coil is completed. Winding end 10 of the second coil
6b is stopped by Nomex tape 116, and is further led out from the notch 112c of the brim 110a. In addition,
Each of the winding start portion and the winding end portion led out from the cutout portion is covered with an insulating silicone tube.

Next, as shown in FIG. 3C, in this embodiment, the winding end 104b of the first coil 104 and the second winding end 104b
The winding start end 106a of the coil 106 is connected to the switching means. That is, the switching means is the three-contact changeover switch 120.
And the winding end 104b of the first coil 104 is connected to the common contact 122 of the changeover switch 120 by the changeover contact 12
4, the winding start end 106a of the second coil 106 and the switching contact 126 are connected to the external terminal 128, respectively.

Therefore, by connecting the common contact 122 and the changeover contact 124 of the changeover switch 120, the electric current is conducted through the first coil 104 and the second coil 106, and the current reducing effect in the high frequency range is obtained. Increase. In addition, by connecting the common contact 122 and the switching contact 126, the current flows through the first coil 104 and the switching contact 12
6 to the external terminal 128. As described above, according to the variable choke coil 100 according to the present invention, an appropriate inductance can be obtained by switching the changeover switch 120. Next, a discharge lamp ballast to which the variable choke coil 100 according to the present invention is applied will be described with reference to FIG.

In the present embodiment, the variable choke coil 1
For the coil length of 00, the first coil 104 has the mercury lamp 12
The length of the second coil 106 is set so that the second coil 106 can supply the proper voltage to the high pressure sodium lamp 14 together with the first coil 104. The changeover switch 120 has changeover contacts 124 and 126 and a common contact 122.
Supplying current to the high pressure sodium lamp 14 side on the 4 side,
The switching contact 126 side supplies current to the mercury lamp 12 side. Next, the operation of the discharge lamp lighting circuit will be described.

First, the changeover switch 120 is switched to the contact 124 side to perform the lighting operation of the high pressure sodium lamp 14. By this contact switching, a starting circuit (not shown) of the high-pressure sodium lamp 14 is activated, and a high-voltage pulse is output from the auxiliary starting electrode 24. The output of the high-voltage pulse causes the sodium lamp 14 to be turned on for easier discharge. The high-voltage pulse generated at this time is the changeover switch 1
Although it is applied to the 20 side as well, it is not applied directly but applied via the second coil 106. Therefore, since the second coil 106 is sufficiently attenuated,
There is no risk of damaging the contacts 124 and 126 of the changeover switch 120.

In this embodiment, the first coil 104,
Since the second coil 106 is wound around a single winding frame, the circuit is not complicated, and there is no risk of cost increase and productivity drop. On the other hand, FIG. 5 shows a circuit configuration of a dimming type discharge lamp ballast using the variable choke coil 100 according to the present invention. In the ballast shown in the figure, the common contact 122 of the changeover switch 120 of the variable choke coil 100 is connected to the start end 106a of the second coil 106, and the end 106b of the first coil 106 and the external terminal are switched contacts 124 and 126, respectively. I am trying.

The power source is the starting end 1 of the first coil 104.
04a and the external terminal switching contact 126 are connected in parallel. Therefore, by connecting the common contact 122 and the switching contact 126 on the external terminal side, a current is supplied to the built-in starter lamp 14 via only the second coil 106, bypassing the first coil 104, and bright by a large current. Lighting is performed. On the other hand, the common contact 122 and the first coil 10
By connecting the terminal 10b on the fourth side, the external contact 12
Bypassing through 6 is not performed, but a largely restricted current is supplied to the built-in starter lamp 14 through the first coil 104 and the second coil 106, and dark lighting is performed with a small current.

As described above, in the dimming type discharge lamp ballast according to this embodiment, the dimming lighting of the lamp 14 can be performed by the one variable choke coil 100. The present invention is not limited to the configuration of each of the above-described embodiments, and various modifications can be made within the scope of the invention. For example, the types of the two arc tubes are not limited to those of the above embodiment, but can be applied to various discharge lamps having a starter built therein.

[0023]

As described above, according to the variable choke coil of the present invention, its inductance can be easily changed by the switching operation of the switching means by one choke coil. Further, according to the two-lamp type discharge lamp lighting circuit using the variable choke coil, in the two arc tube installed type discharge lamps having the arc tube equipped with the high voltage pulse generating starter on at least one side, the discharge lamp lighting is performed. It is possible to effectively prevent the change-over switch for switching between the two arc tubes from being deteriorated by the high-voltage pulse that sometimes occurs. In other words, direct application of high-voltage pulse to the changeover switch can be avoided and its damage can be prevented, so that the contact pressure of the changeover switch contact can be reduced and the life of the changeover switch can be extended. Can also be achieved. Further, according to the dimming type discharge lamp lighting circuit using the variable choke coil, the dimming of the discharge lamp can be easily performed by one choke coil by switching the switching means.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a variable choke coil according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a winding state of the variable choke coil shown in FIG.

3 is an explanatory diagram of a winding end state of the variable choke coil shown in FIG.

4 is an explanatory view of a two-lamp type discharge lamp lighting circuit using the variable choke coil shown in FIG.

FIG. 5 is an explanatory diagram of a dimming type discharge lamp lighting circuit using a variable choke coil according to the present invention.

FIG. 6 is a configuration diagram of a conventional discharge lamp lighting circuit.

[Explanation of symbols]

 100 variable choke coil 104 first coil 106 second coil 108 insulator 120 switching means

Claims (3)

[Claims] 1. A first coil wound on a winding frame, a second coil wound on the first coil, and an insulator arranged at a boundary between the first coil and the second coil, A variable choke coil comprising: one end of the first coil, one end of the second coil, and at least three terminals of an external terminal, and switching means for interconnecting the terminals. 2. A first arc tube and a second arc tube, at least one of which has a high-voltage pulse generator-type starter and which are connected in parallel with each other, a power supply, and the first and second arc tubes. A variable choke coil connected between the first coil and the second choke coil for voltage adjustment, wherein the variable choke coil is wound on the first coil, the first coil being connected to a start end side and wound on a winding frame. A second coil, an insulator arranged at the boundary between the first coil and the second coil, and a switching means for switching a current supplied from a power source between the first arc tube side and the second arc tube side. The switching means has a common contact at the end of the first coil, a first switching contact through a second coil to a high-voltage pulse generating arc tube, and a second switching contact to the other arc tube. Discharge lamp lighting circuit characterized by being connected to each other. 3. A variable choke coil, which is connected between a power source and an arc tube and adjusts a voltage, wherein the variable choke coil includes a first coil connected to a starting end side and wound around a winding frame. A second coil wound around the first coil, an insulator arranged at a boundary between the first coil and the second coil, and switching means for adjusting a current supplied from a power source to the arc tube, In the switching means, the common contact is connected to the starting end of the second coil, the first switching contact is connected to the power source via the first coil, and the second switching contact is connected to the power source without the coil. Discharge lamp lighting circuit characterized by.