JPS5917116Y2 - discharge lamp lighting device - Google Patents

Description

[Detailed description of the invention] This invention relates to a discharge lamp lighting device, and in particular to a discharge lamp lighting device including an improved current limiting device for lighting the other discharge lamp by means of high frequency and high voltage generation applied to only one discharge lamp. Related to electric light lighting devices.

FIG. 1 is an electric circuit diagram showing an example of a discharge lamp lighting device using one lighting method for an adult cow cycle star, which is the background of this invention.

In the configuration, reference numeral 1 denotes an AC power supply, to which a series circuit of a primary winding 21 of a current limiting choke 2 as an example of a current limiting device and a first discharge lamp 3a is connected, and a secondary winding 2
2 and a series circuit of the second discharge lamp 3b are connected.

Therefore, two discharge lamps are connected in parallel to the AC power source 1.

Further, a high voltage circuit 4 serving as an intermittent high voltage generating means is connected in parallel to the first discharge lamp 3a.

This high voltage circuit 4 includes an oscillation capacitor 51 and a thyristor 5.
The intermittent oscillation capacitor 6 is connected in series to a boost circuit 5 formed by connecting a series circuit of a boost inductor 53 and a boost inductor 53 in parallel.

In operation, when AC power 1 is supplied, the primary winding 2
The oscillation capacitor 51 is charged via the first chip and the intermittent oscillation capacitor 6.

When the charging voltage of the oscillation capacitor 51 causes a breakover voltage of the thyristor 52, the thyristor 52 becomes conductive.

Accordingly, the oscillation capacitor 51 and the boost inductor 53 operate in oscillation in cooperation to generate high frequency and high voltage.

The oscillation operation of the booster circuit 5 would continue without the intermittent oscillation capacitor 6, but if the capacitor 6 was present, it would be charged by the input J-J current of the booster circuit 5, and its terminal voltage would offset the power supply voltage. Therefore, the voltage e of the power supply 1 oscillates intermittently at each half-cycle rise of the voltage e.

The oscillation operation of the second booster circuit 5 is repeated every half cycle, and the low frequency power supply voltage and the oscillation output are superimposed and applied to the discharge lamp 3a.

When energy necessary for starting the discharge lamp 3a is given to the discharge lamp 3a by the application of this superimposed electric power, the discharge lamp 3a starts and lights up.

When the discharge lamp 3a is turned on, the tube current 11 flowing to the discharge lamp 3a or the input current of the high voltage circuit 4 flows through the primary winding 21 of the current limiting choke 2.
An induced voltage is generated on the next winding 22 side.

Since the voltage obtained by superimposing this induced voltage and the power supply voltage is supplied to the discharge lamp 3b via the secondary winding 22 of the current limiting choke 2, the discharge lamp 3b is started and lit only by the power supply voltage.

FIG. 2 is an illustrative diagram of a conventional current-limiting choke 2 used in the discharge lamp lighting device shown in FIG.

In the figure, a conventional current-limiting choke 2 is constructed by winding a primary winding 21 and a secondary winding 22 around the central leg of an iron core 23. Voltage,
In order to obtain a current, a large number of turns of the windings 21 and 22 is required, so a large space is required for the part where the windings are wound, and the width d1 of the iron core 23 becomes large, and therefore the shape of the iron core 23 becomes large. There was a drawback.

However, although there is a general demand for smaller lighting equipment,
If the width of the current limiting choke 2 is too large, it will not be possible to downsize the lamp (particularly in fluorescent discharge lamps, etc., the lamp is elongated, so the lamp must be downsized! This is mainly due to the width of the lamp). .

Therefore, a current limiting choke was considered in which the iron core of the current limiting choke 2 was made smaller in the width direction and the primary winding 21 and the secondary winding 22 were wound around the elongated iron core. In order to obtain a current limiting choke of , a certain area of the iron core is required.

Therefore, if the iron core is simply elongated, the problem arises that the magnetic path becomes narrower and the magnetic resistance increases, resulting in an increase in leakage magnetic flux and an increase in impedance.

In order to solve this problem, it is necessary to provide an air gap in the magnetic path, but this weakens the coupling between the primary and secondary windings, and therefore reduces the induced voltage in the secondary windings. This causes problems such as difficulty in starting a discharge lamp without a starter and poor fluctuation rate.

Therefore, the main purpose of this invention is to provide a current limiting choke that does not reduce the coupling between the choke coil on the starter side and the choke coil on the non-starter side even if the iron core is elongated in order to downsize the lamp. To provide a discharge lamp lighting device which can reliably start and light a discharge lamp without a starter and has an excellent fluctuation rate.

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

To summarize this idea, by dividing at least the secondary winding of the current limiting choke and winding it around the iron core, even if the iron core of the current limiting choke is elongated, leakage flux is small and coupling with the primary winding is possible. By using a current limiting choke with a strong current, lamps without a starter can be reliably started and lit, and the fluctuation rate can be improved.

FIG. 3 is a circuit diagram of a discharge lighting device according to an embodiment of this invention.

Although the intermittent oscillation capacitor 6 of the high voltage circuit 4 is inserted into the booster circuit 5, there is no difference in operation.

FIG. 4 is a concrete illustration of the current limiting choke 2' applied to the discharge lamp lighting device of this invention.

Next, the specific structure of the current limiting choke 2', which is a feature of this invention, will be explained with reference to FIGS. 3 and 4.

In this embodiment, the primary winding of the current limiting choke 2' and the
Each of the secondary windings is divided into two parts, and the divided primary windings are shown as windings 21a and 21b, and the divided secondary windings are shown as windings 22a and 22b.

In addition, an iron core 23a having a relatively small shape that can be wound around one of the divided primary windings and one of the secondary windings 21a and 22a, and the other divided primary winding and An iron core 23b is made smaller so that the secondary windings 21b, 221) can be wound thereon.

One primary winding 21 a is wound around the center leg of one iron core 23 a, and one secondary winding 22 is wound around the center leg of one iron core 23 a.
a is wound, thereby configuring the first current limiting choke 2a.

Further, the other primary winding 21 b is wound around the center leg of the other iron core 23 b, and the other secondary winding 22 is also wound around the center leg of the other iron core 23 b.
b is wound, thereby configuring the second current limiting choke 2b.

The primary winding 21 a of the first current limiting choke 2 a and the primary winding 21 b of the second current limiting choke 2 b are connected in series, and the secondary winding 22 of the first current limiting choke 2 a is connected in series. A and the secondary winding 22b of the second current limiting choke 2b are connected in series to constitute the current limiting choke 2' of this embodiment.

This current limiting choke 2' has the same characteristics as the conventional current limiting choke 2 shown in FIG.
It has the advantage that efficiency does not decrease and impedance does not increase.

Furthermore, the width of the current limiting choke 2' of this embodiment can be reduced by dividing it into two smaller current limiting chokes 2a and 2b.

Placing 2b at a separate location within the lamp has the advantage of improved heat dissipation characteristics and relatively low temperature rise.

FIG. 5 shows an illustrative view of a current limiting choke 2'' according to another embodiment of the invention.

In the current limiting choke 2'' of this embodiment, the iron core 23 is made narrow and elongated, the primary winding 21 is wound around the central part of the central leg, the secondary winding is divided, and the iron core 2
Secondary winding 22a, 2 divided into both sides of the central leg of 3
2b is wound, and its secondary windings 22a and 22b are connected in series.

This embodiment also solves problems such as an increase in leakage magnetic flux and an increase in impedance that would occur if the current limiting choke was simply configured to be elongated.

As described above, according to this invention, a current-limiting choke that does not increase leakage magnetic flux or impedance even if the shape of the current-limiting choke is made smaller can be obtained, and a discharge lamp lighting device to which this current-limiting choke is applied is one. It is possible to reliably start and light two discharge lamps with a single starter, the fluctuation rate is good, and the unique effects of being able to miniaturize the shape of the lamp are obtained.

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram of a discharge lamp lighting device which is the background of this invention. FIG. 2 shows an illustrative diagram of a conventional current-limiting choke used in the discharge lamp lighting device of FIG. 1. FIG. 3 is an electrical circuit diagram of a discharge lamp lighting device according to an embodiment of this invention. FIG. 4 shows a specific illustration of the current limiting choke of this embodiment. FIG. 5 is an illustrative view showing a current limiting choke according to another embodiment of this invention. In the figure, 1 is an AC power supply, 2 is a conventional current limiting choke,
2' and 2'' are current limiting chokes of this embodiment, 21.2
1 a, 21 b are primary windings, 22.22 a, 2
2b is a secondary winding, 23.23a and 23b are iron cores, 3a and 3b are discharge lamps, 4 is a high voltage circuit, 5 is a booster circuit, 51 is an oscillation capacitor, 52 is a thyristor, 53
6 indicates a boost inductor, and 6 indicates an intermittent oscillation capacitor.

Claims (3)

[Scope of utility model registration request] (1) A low frequency AC power supply, a current limiting device in which a first winding and a second winding are wound around an iron core and both windings are magnetically coupled; first and second discharge lamps connected in series to each of the windings and connected in parallel to the low frequency AC power source, and provided to the first discharge lamp and supplying the low frequency AC power source. the first discharge lamp or the high-voltage generator through the first winding, when the first discharge lamp is lit by the output of the high-voltage generator, The low frequency component flowing through the means is
In the discharge lamp lighting device, the current limiting device transmits energy to the second winding through magnetic coupling between the winding and the second winding, thereby providing restriking energy to the second discharge lamp. A discharge lamp lighting device characterized in that at least a second winding is divided into two and wound. (2) The current limiting device divides the iron core into two, the first winding and the second winding into two, and the first winding and the second winding on one core. At the same time, the other of the first winding and the second winding is wound around the other iron core.
A utility model according to claim 1, characterized in that the windings are connected in series, and one of the second windings is connected in series with the other of the second windings. Discharge lamp lighting device. (3) The current limiting device is constructed by winding the first winding around the center of the iron core, and winding the divided second winding, one winding and the other winding, on both sides of the iron core. A discharge lamp lighting device according to claim (1) of the registered utility model, characterized in that: