JPH044599A - T-form discharge lamp ballast - Google Patents

Abstract

PURPOSE:To make integration of components, enhance producibility, and accomplish a short term of delivery by connecting two primary coil in parallel with a power supply, and connecting a discharge lamp with the secondary coil. CONSTITUTION:Primary coils 116a, 116b constitute a parallel circuitry and are connected with a power supply 110. One end of a secondary coil 120 is connected with one end of the primary coil 116a, while the other end of the secondary coil 120 connected with the other end of the primary coil 116a via a discharge lamp 114. Therefore, a primary coil of TC type can be utilized. This permits use of the same Cu wire for coil as a primary coil used in a conventional TC type ballast, to enable integration of primary coils of TC type and T type.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a T-type discharge lamp ballast, and in particular to an improvement of its circuit.

[Prior Art] Various ballasts such as T-type and TC-type ballasts have been used as ballasts for discharge lamps.

FIG. 2 shows the circuit configuration of a typical T-type ballast.

In the same figure, commercial power supply (100V, 50Hz/60H
An alternating current is supplied from an alternating current power source 10 to a ballast 12, and is subjected to a predetermined voltage transformation action to light up a discharge lamp 14.

Here, the ballast 12 includes a primary coil 16 connected to the AC power source 10, and a secondary coil 20 electromagnetically coupled to the secondary coil 16 via an iron core 18.

One end of the secondary coil 20 is connected to the primary coil 16, and the other end is connected to the other end of the primary coil 16 via the discharge lamp 14.

On the other hand, FIG. 3 shows the circuit configuration of a general TC type ballast.

The ballast 12 shown in the figure has two primary coils 16a.

16b, the primary coil 16a is connected in the same way as the primary coil 16 shown in FIG.
6b is connected to the power supply 10 via the phase slow capacitor 22.

[Problems to be Solved by the Invention] As mentioned above, the primary coils used in the TC type and T type ballasts have different specifications, and have different wire diameters and numbers of turns. For this reason, it is difficult to arrange parts, and it is difficult to unify parts.
It was difficult to improve productivity and achieve short delivery times.

Therefore, we unified the primary coils of TC type and T type ballasts,
In particular, since the production ratio of TC type and T type is approximately 70:30, it has been desired to use the TC type primary coil as the T type primary coil as well.

The present invention has been made in view of the problems of the prior art described above, and its object is to provide a T-shaped electric lamp ballast that can use the primary coil used in a TC-type discharge lamp ballast.

[Means for Solving the Problems] In order to achieve the above object, a T-shaped electric lamp ballast according to the present invention includes two primary coils and one secondary coil that are electromagnetically coupled through an iron core.

The two primary coils constitute a parallel circuit and are connected to a power source, and the secondary coil is connected to a discharge lamp.

[Function] Since the T-shaped electric lamp ballast according to the present invention has the above-described means, its secondary coil can also be used as the primary coil of the TC-type discharge lamp ballast. In other words, the primary coil of the TC type discharge lamp ballast is divided into two primary coils, but by connecting both of them in parallel to the power supply without using a capacitor, the primary coil of the T type electric lamp ballast can be divided into two primary coils. It can also be used as a coil, making it possible to unify the use of second-order coils.

[Example code] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a circuit configuration of an embodiment of the present invention.

Note that portions corresponding to those in the prior art described above are indicated with a numeral 1°O added thereto, and their explanations will be omitted.

A characteristic feature of the present invention is that the primary coil of a conventional TC type discharge lamp ballast is used as it is as the primary coil of a T-type electric lamp ballast.

That is, the T-shaped electric lamp ballast 112 according to this embodiment includes two primary coils 116a and 116b, similar to the TC-type discharge lamp ballast shown in FIG.

The secondary coils 116a and 116b constitute a parallel circuit,
It is connected to a power source 110.

On the other hand, one end of the secondary coil 120 is connected to one end of the primary coil 116a, and the other end of the secondary coil 120 is connected to the other end of the primary coil 116a via the discharge lamp 114.

By employing the above circuit configuration, the T-shaped lamp ballast according to the present invention can also be used as a primary coil for the TC type.

Therefore, the same copper wire for the coil as the primary coil used in the conventional TC type ballast can be used, and the TC type and T° type primary coils can be unified.

Note that the ratio of the current flowing through the secondary coil 116 to the winding area, that is, the current density (A/mm), is approximately the same or slightly lower, so the temperature rise does not become large.

In addition, normally in a TC type discharge lamp ballast, the primary coil 116a
Generally, the number of turns is greater than that of the primary coil 116b (capacitor connection side), but the secondary coils 116a and 11
6b has the same number of turns, or the second coil 116b
Even if the number of turns of the primary coil 116a is greater than that of the primary coil 116a, it can be used as a T-shaped lamp ballast by connecting each secondary coil in parallel to the power source as described above.

[Effects of the Invention] As explained above, according to the T-shaped lamp ballast according to the present invention, the primary coil of a conventional TC-shaped ballast can be used as is, so parts can be unified, and productivity can be improved. This makes it possible to improve performance and shorten delivery times.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention.
Circuit diagram of conventional T-type electric lamp ballast FIG. 3 is a circuit diagram of a conventional TC-type electric lamp ballast. 10.110 ... power supply, 12.112 ... ballast, 14.114 ... discharge lamp, 16 a, 16 b, 116 a, 116
b...-Secondary coil, 18.118... Iron core, 20.120... Secondary coil. Applicant: i-Writing System Co., Ltd. Figure 2

Claims (1)

[Claims] (1) Two primary coils and one secondary coil are electromagnetically coupled through an iron core, the two primary coils form a parallel circuit and are connected to a power source, and the secondary coil is equipped with a discharge lamp. A T-type discharge lamp ballast, characterized in that: is connected to the T-type discharge lamp ballast.