JPH0654740B2 - Ballast for discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a phase-advance type discharge lamp ballast used in combination with a phase-advancing capacitor.

(Prior Art) When a phase-advancing type discharge lamp ballast and a phase-advancing capacitor are combined, the ballast characteristic greatly changes due to the capacitance value tolerance of the phase-advancing capacitor. Therefore, the phase-advancing capacitor is divided into several ranks according to its capacity range, and the ballast characteristics are adjusted by combining discharge lamp ballasts corresponding to each rank.

The correspondence of the ranks of the phase advancing capacitors of this ballast for discharge lamps is conventionally adjusted by setting the number of turns that increases or decreases with respect to the required reference value number of turns of the secondary coil. This is because the main factor that determines the ballast characteristic is the number of turns of the secondary coil with respect to the phase advancing capacitor and the magnetic circuit of the iron core, but the number of turns of the secondary coil is adjusted according to the capacitance value of the phase advancing capacitor. This is because, while the magnetic circuit using the iron core has many abutting portions of the iron core, variations are likely to occur.

The production of this ballast and phase-advancing capacitor is
As shown in the figure, based on the production plan, first, a phase-advancing capacitor is manufactured, its capacity is measured and capacity division is performed, and each quantity for each rank is output, and then, for each capacity rank of the phase-advancing capacitor. A secondary coil having a corresponding number of turns is formed by the number of turns for each capacity rank, a required iron core, etc. are formed, and a phase advance capacitor for each capacity rank and a secondary coil for each capacity rank are provided. It was designed to be assembled together with the iron core, etc.

(Problems to be solved by the invention) Conventionally, the number of turns of the secondary coil has been adjusted according to the capacity rank of the phase advancing capacitor, but since the iron core has many butt portions, variations in the magnetic circuit occur. Since it is easy, even if the secondary coil is used, the ballast characteristics are likely to change after the iron core is assembled. In particular, the air gap between the center leg of the iron core and the pass iron core is an important part that determines the leakage flux, whereas the conventional ballast has poor positioning accuracy of the pass iron core and the air gap changes depending on the assembly condition. Even if the number of turns of the secondary coil was made to correspond to the capacity rank of the phase-advancing capacitor, the ballast characteristics were likely to vary.

Also, since the number of turns of the secondary coil is changed in accordance with the capacity rank of the phase-advancing capacitor, if the external dimensions of the secondary coil change in an increasing direction, the center leg and side leg of the iron core to be combined with this coil will be butted. Variations occur and affect the magnetic circuit of the iron core.

When combining a ballast and a phase-advancing capacitor, first manufacture the phase-advancing capacitor, measure its capacitance value and rank it, and then form a secondary coil for each capacitance rank. Therefore, it is not possible to manufacture the phase-advancing capacitor and the secondary coil in parallel, which increases the manufacturing period and is uneconomical.

The present invention has been made in view of the above points, and adopts a structure for reliably positioning and holding the pass iron core in a fixed position between the center leg and the side leg, with respect to the capacitance value tolerance of the phase advance capacitor. It is an object of the present invention to provide a ballast for a discharge lamp, which is adapted by adjusting a magnetic circuit by selecting a pass iron core.

[Structure of Invention]

(Means for Solving the Problems) The present invention relates to a pair of coil bobbins around which a primary coil and a secondary coil are respectively wound, an iron core having central legs and side legs fitted to the coil cobins, and It has a pass iron core that is fitted between the primary coil and the secondary coil, the inner surface of which faces the central leg and the outer surface of which faces the side leg, and is used in combination with a phase-advancing capacitor. In a ballast for a discharge lamp whose characteristics are adjusted according to a value tolerance, the primary coil and the secondary coil are set to required reference value turns, and one end of the one coil bobbin facing the other coil bobbin. A pair of flanges are integrally provided on the
A storage part for storing and holding the path core is formed between the flange parts, and the path core is opposed to both end positions in the longitudinal direction of the path core to be stored in the storage part, and the path core is formed between the central leg and the side leg. A pair of positioning receiving portions for positioning and holding in a fixed position are provided between them, and a pair of positioning protrusions that fit into the positioning receiving portions are provided at both ends in the longitudinal direction of the path iron core. A pass iron core is used which makes the width of the air gap formed between the side surface and the central leg correspond to the capacity tolerance of the phase advance capacitor by selecting the position of the inner side surface between both positioning projections. .

(Operation) In the present invention, the path iron core housed in the housing portion of the coil bobbin and fitted with the positioning protrusion of the positioning receiving portion of the coil bobbin is held between the flange portion and the holding wall portion, and Positioned and held in place between the central and side legs. An air gap of a predetermined width is formed uniformly between the inner side surface between the positioning protrusions of the path iron core that is positioned and held at a fixed position and the central leg. The position of the inner side surface in is selected so as to correspond to the capacitance value tolerance of the phase advancing capacitor, the width of the air gap is set to the width corresponding to the capacitance value tolerance of the phase advancing capacitor, and the ballast characteristic is adjusted to be constant. .

(Example) Hereinafter, the structure of one example of the ballast for discharge lamps of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 is a ballast body, and this ballast body 1
Is a coil bobbin 3 on which the primary coil 2 is wound, a coil bobbin 6 on which the secondary coil 4 and the filament coil 5 are wound, and an iron core fitted to the center and side portions of the coil bobbins 3 and 6 in a butt state. 7 and a pass iron core 8, and a case 9 is attached to the outer peripheral surface of the ballast body 1 while holding the iron core 7.

The coil bobbin 3 is formed of a synthetic resin, and flange portions 12 and 13 are provided on both outer circumferences of a body portion 11 formed in a square tube shape. The primary coil 2 is wound between the flange portions 12 and 13. To be done. Further, a terminal block 15 having a plurality of terminals 14 to which the coils 2, 4, 5 and external lead wires are connected is integrally formed at the upper edge of the one flange portion 12, and the other flange portion 13 is formed. The coil bobbin 6 is abutted on the side surface of the.

As shown in FIGS. 2 and 3, the coil bobbin 6 is formed of a synthetic resin, and a flange portion 17, 17, 17 is provided on the outer periphery of one end of a body portion 16 formed in a square tube shape. The filament coil 5 is wound between the flange portions 17, 17, 17. Further, flange portions 18 and 19 are provided on the outer periphery of the body portion 16 and the other outer periphery of the body portion 16 which are separated from the side surface of the flange portion 17 by ₁₁ dimensions, and the secondary coil 4 is provided between the both flanges 18 and 19. It is wound. Further, the flange portion 17 at one end of the body portion 16 is butted against the coil bobbin 3, and the coils 2, 4, 5 are connected to the upper edge portion of the flange portion 19 at the other end portion of the body portion 16 and will be described later. A terminal block 21 having a plurality of terminals 20 to which a phase advancing capacitor is connected is integrally formed.

Storage portions 25, 25 for the pass iron core 8 are provided at the left and right ends of the body portion 16 between the flange portion 18 and the flange portion 17 facing the flange portion 18. The housing portion 25, the flange portions 17, 18 width is configured to l ₁ dimension, positioning receiving portions 26, 26 are provided on the upper and lower edge portions of the body portion 16. The positioning receiving portion 26 is composed of a holding step portion 27 whose outer portion is arcuate and is formed in a horizontal plane, and a stopper portion 28 which is formed perpendicularly to the deepest portion of the holding step portion 27. An opening 29 is formed in the body 16 between the upper and lower positioning receiving portions 26.

The iron core 7 includes a T-shaped laminated iron core 31 inserted into the body portions 16, 16 of the coil bobbins 3, 6 and a pair of L-shaped laminated cores fitted on both sides of the coil bobbins 3, 6 and joined to the T-shaped laminated iron core 31. Body part of coil bobbins 3 and 6 composed of iron cores 32 and 32
The 31 part of the T-shaped laminated iron core inserted into the 6 and 16 becomes the central leg 33 of the iron core 7 and is fitted to both sides of the coil bobbins 3 and 6.
The laminated cores 32, 32 serve as the side legs 34, 34 of the core 7.

The pass iron core 8 is provided in a substantially U shape and is provided in the storage portion 25.
The coil bobbin 6 is laminated to have a width substantially equal to the l ₁ dimension of the coil bobbin 6
Positioning projections 36, 36 that fit into the respective positioning receiving portions 26, 26 of the coil bobbin 6 are provided at the upper and lower edges of the inner side surface 35 facing each other. The positioning projections 36, 36 are formed on the respective holding step portions 2
It is composed of holding surfaces 37, 37 that come into contact with 7, 27 and contact surfaces 38, 38 that come into contact with the stopper portions 28, 28, and chamfered portions 39 are formed at the corners between the holding surface 37 and the contact surface 38. Has been done. In this pass iron core 8, the width l ₂ between the contact surface 38 and the outer surface 40 is constant, and the width l ₃ between the inner surface 35 and the outer surface 40 has a dimension of a phase advancing capacitor which will be described later. The pass iron core 8 that is changed according to the capacity rank and corresponds to the capacity rank is used when the ballast main body 1 is assembled.

Also, 41 is a phase advancing capacitor.
After manufacturing, the capacitors are ranked according to their capacity value and are combined with the corresponding ballast body 1 for each capacity rank. The capacitance rank of the phase-advancing capacitor 41 divides the capacitance variation with respect to the reference capacitance value into three ranges, for example, rank A is -4 to -2%, rank B is -2 to + 2%, and rank C is +2 to + 4%. . When the phase advancing capacitor 41 is combined with the ballast body 1, the mounting plate 42 attached to the lower surface is connected to the case 9, and a plurality of lead wires 43 drawn out from the end surface of the phase advancing capacitor 41 are provided. Wired to terminal 20.

Next, the operation of this embodiment will be described.

First, in order to assemble the ballast, the coil bobbin 3 on which the primary coil 2 is wound and the coil bobbin 6 on which the secondary coil 4 and the filament coil 5 are wound respectively are butted, and the T-shaped laminated iron core 31 is attached to the body portion 16. ， 16 inside to insert
Insert the pass iron cores 8 and 8 into the 25 and 25 from both sides,
The L-shaped laminated iron cores 32, 32 are fitted from both outsides of the coil bobbins 3, 6 and butt against the T-shaped laminated iron core 31 to form the iron core 7, and the cover 9 is attached for assembly.

In this assembled state, the pass iron core 8 is positioned and held in the stacking direction between the flange portions 17 and 18, and the positioning protrusions 36 and 36 are provided.
The holding surfaces 37, 37 of the positioning holding portions 26, 26 of the positioning receiving portions 26, 26
It comes into contact with and is positioned and held in the vertical direction.
The outer surfaces 4 and 8 contact the stoppers 28 and 28.
0 and 40 respectively come into contact with the side legs 34 and 34 of the iron core 7 to perform positioning and holding in the insertion direction.
Is positioned and held at a fixed position in all directions by the iron core 7 of the coil bobbin 6.

By incorporating the pass iron cores 8, 8 and the iron core 7 into the coil bobbin 6, an air gap S that defines a leakage magnetic flux is formed between the inner side surface 35 of the pass iron core 8 and the side face of the central leg 33. Since the pass iron core 8 is reliably positioned and held by the coil bobbin 6, the air gap S has a width l ₄ thereof.
Is always constant, the leakage flux is constant, and the ballast characteristics are stabilized.

Further, the width l ₄ of the air gap S can be adjusted by using the pass iron cores 8 having different widths l ₃ between the inner side surface 35 and the outer side surface 40 of the pass iron core 8, and the air gap S is adjusted. By doing so, the number of turns of the secondary coil 4 can be set to a required number of turns of the reference value to be constant, and the ballast characteristic can be adjusted while the stacking of the pass iron core 8 is kept constant.

Therefore, when the phase-advancing capacitor 41 and the ballast body 1 are combined, the capacity L of the phase-advancing capacitor 41 is, for example, rank A, the width l ₃ is 6.4 mm, and rank B. On the other hand, a ballast main body 1 having a width l ₃ of 6.5 mm and a width l ₃ of 6.6 mm for rank C is selected, and the air gap S is adjusted by incorporating the path iron core 8 into the ballast body 1.
And the phase-advancing capacitor 41. That is, as the capacity variation of the phase advancing capacitor 41 becomes to the (+) side, the width l ₄ of the air gap S is increased to reduce the leakage magnetic flux, and the capacity variation of the phase advancing capacitor 41 becomes to the (-) side. Accordingly, the width l ₄ of the air gap S is narrowed to increase the leakage magnetic flux.

In addition, the phase-advancing capacitor 41 and the ballast main body 1 are manufactured by the fourth
Based on the production plan, advance capacitor
41, the winding of the secondary coil 4 (the primary coil 2 and the filament coil 5 are also wound), and the pass core 8 that can be preliminarily supported before the capacity rank of the phase-advancing capacitor 41 is set. Manufacturing is done in parallel and the pass iron core 8
Reserves a predetermined number of reserves for each rank. Then, the manufactured phase-advancing capacitors 41 are ranked according to the capacitance value, and the phase-advancing capacitors for each capacitance rank are classified.
41 and the pass iron core 8 corresponding to the capacity rank are combined to assemble a ballast together with the secondary coil 4 and the like. Therefore, the phase advancing capacitor 41 and the secondary coil can be manufactured in parallel without manufacturing and ranking the phase advancing capacitor 41, so that a ballast incorporating the phase advancing capacitor 41 can be manufactured in a short period of time. be able to.

The used portion of the pass iron core 8 used for assembly is manufactured and supplemented in parallel with the manufacture of the phase advancing capacitor 41. In addition, the pass iron core 8 will be reserved by a predetermined number corresponding to the capacity rank of the phase-advancing capacitor 41 and used, and the used amount will be replenished. However, the pass iron core 8 can be manufactured in a short time and is small in size and space. Therefore, even if the pass iron core 8 is reserved, it is more economical than other parts.

Also, because the ballast characteristics are adjusted by changing the pass iron core 8,
Since the number of turns of the secondary coil 4 may be constant as the required number of turns of the reference value and the coil outer shape does not change depending on the number of turns, the T-shaped laminated core 31 of the iron core 7 and the L-shaped laminated cores 32, 32 are butted under the same condition. The magnetic circuit variation is reduced and the characteristics are stabilized.

〔The invention's effect〕

According to the present invention, the path iron core is housed in the housing portion of the coil bobbin and the positioning projections at both ends of the path iron core are fitted into the positioning receiving portions of the coil bobbin, so that the path iron core is provided between the central leg and the side leg. In order to select the path iron core where the position of the inner side surface between both positioning protrusions sets the air gap corresponding to the capacitance value tolerance of the phase advancing capacitor for the path iron core, By simply selecting the pass iron core while keeping the required number of turns of the secondary coil as the required number of turns, the capacity tolerance of the phase advance capacitor can be easily accommodated and the ballast characteristic can be adjusted to a constant value. Further, compared with the case where the conventional secondary coil is used, the phase-advancing capacitor and the secondary coil can be manufactured in parallel, and the manufacturing period can be shortened.
Since the number of turns of the secondary coil is constant and the outer shape of the coil is constant, it is possible to prevent variations in the butting of the iron cores.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of a discharge lamp ballast according to the present invention, FIG. 2 is a perspective view of an essential part thereof, FIG. 3 is a longitudinal sectional view thereof, and FIG. Explanatory drawing of the manufacturing process, 5th
The figure is an explanatory view of a conventional manufacturing process. 2 ... Primary coil, 3 ... Coil bobbin, 4 ... Secondary coil, 6 ... Coil bobbin, 7 ... Iron core, 8 ... Pass iron core, 17, 18 ... Flange section, 25 ... Storage section, 26 ... … Positioning receiving part, 33 …… Center leg, 34 …… Side leg, 35 …… Inner side,
36 …… Positioning protrusion, 40 …… Outside surface, 41 …… Advancing capacitor, S …… Air gap.

Claims (1)

[Claims] 1. A pair of coil bobbins around which a primary coil and a secondary coil are respectively wound, an iron core having central legs and side legs fitted to the coil bobbins, and between the primary coil and the secondary coil. It is equipped with a pass iron core, the inner surface of which faces the central leg and the outer surface of which faces the side leg, and is used in combination with a phase-advancing capacitor to adjust the characteristics according to the capacitance tolerance of the phase-advancing capacitor. In the ballast for a discharge lamp to be set, the primary coil and the secondary coil are set to a required reference number of turns, and one of the coil bobbins is provided with a pair of flange portions integrally at an end portion facing the other coil bobbin. , Forming a storage portion for storing and holding the path iron core between the flange portions, and facing the end portions in the longitudinal direction of the path iron core to be stored in the housing portion, the path iron core with the central leg and the side leg. A pair of positioning receiving parts for positioning and holding in a fixed position are provided between them, and a pair of positioning projecting parts that fit into the positioning receiving parts are provided at both ends in the longitudinal direction of the path core, and between these two positioning projecting parts. A pass iron core was used that corresponds the width of the air gap formed between the side surface and the center leg to the capacitance value tolerance of the phase advance capacitor by selecting the position of the inner side surface between the positioning protrusions. Characteristic ballast for discharge lamps.