JPH06325950A - Inverter device - Google Patents

Abstract

PURPOSE:To realize an inverter device of high productivity, which can be easily made into a thin shape, by packaging circuit parts such as transistor and capacitor in a conductor pattern of a printed board and by connecting this conductor pattern and a secondary winding to respective prescribed terminals. CONSTITUTION:An inverter device comprises a printed board 30, with a through hole 31 having a primary winding 35 of a transformer formed around it by a conductor pattern, which is fixed onto a plate of magnetic material 10 by inserting a winding shaft 11 into the through hole 31, and a secondary winding 50 electromagnetically coupled to the primary winding 35 which is wound in a row in multilayers and set up around the winding shaft 12. Further, it comprises a choke coil 60 installed around the shaft 13 with the plate of magnetic material 10, which is connected to a terminal 34 on the printed board 30, and an insulating base 20 on which a plurality of terminals 21 and 22 are mounted and which is fixed to the plate of magnetic material 10. Circuit parts 90 such as transistor and capacitor are packaged in the conductor pattern of the printed board 30 and the conductor pattern and the secondary wiring 50 are, respectively, connected to prescribed terminals 21 and 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an inverter device in which an inverter circuit used for lighting a cold cathode tube for illuminating the back surface of a liquid crystal display device is assembled as one composite component.

[0002]

2. Description of the Related Art The circuit configuration of a commonly used inverter device for lighting a cold cathode fluorescent lamp CFL is as shown in FIG. 5, for example, a primary winding 35, a feedback winding 36, and a secondary winding.
An output transformer T having 50, a choke coil 60, transistors Q ₁ , Q ₂ , capacitors C ₁ , C ₂ , a resistor R ₁ ,
It is composed of circuit components such as R ₂ . The conventional inverter device has a configuration in which these circuit components are mounted on one printed circuit board, and the transformer T, the choke coil 60, etc. are completed as individual components in advance on each printed circuit board. It was installed and assembled.

[0003]

Since the inverter device is mounted in a narrow gap, it is required to be particularly thin. However, in the conventional structure in which the components such as the transformer T and the choke coil 60 are mounted on the printed circuit board, the entire inverter device becomes large in size, and it is difficult to make it thin, and there is a problem that assembly is troublesome. .

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inverter device which can be easily thinned and has high productivity.

[0005]

In order to achieve this object, the present invention provides a small and thin circuit portion of the inverter device other than the cold cathode fluorescent lamp CFL and the secondary side load current limiting capacitor C ₂ . It is organized in blocks. That is, the inverter device of the present invention, two magnetic material plates 10 and 40 that are abutted to each other to form a closed magnetic circuit, and two winding shafts 11 integrally formed on either one of the magnetic material plates 10 and 40,
12, a printed circuit board 30 having a through hole 31 around which the primary winding 35 of the transformer is formed by a conductor pattern and having the winding shaft 11 inserted into the through hole 31 and fixed on the magnetic plate 10; The printed circuit board is wound in multiple layers from the outside to the outside.
A secondary winding 50, which is arranged on the coil 30 and around the winding shaft 12 and electromagnetically coupled to the primary winding 35, a magnetic core 70 that forms a second closed magnetic path together with the magnetic plate 10, and a magnetic plate. A winding shaft 13 formed integrally with either one of the magnetic core 70 and the magnetic core 70;
Terminal 34 on PCB 30 mounted around 13
A choke coil 60 electrically connected to the
21 and 22 are attached and the insulating base 20 fixed to the magnetic plate 10 is mounted, and the circuit pattern 90 such as a transistor and a capacitor is mounted on the conductor pattern of the printed circuit board 30, and the conductor pattern and the secondary winding are mounted. Wire 50 to the designated terminal 21,
It is characterized by a configuration in which each is connected to 22.

[0006]

1 to 3 show an embodiment of an inverter device according to the present invention. FIG. 1 is a front sectional view, FIG. 2 is a plan view, and FIG. 3 is a magnetic plate 10 and a magnetic core 70. It is a top view of the principal part which removed. On the insulating magnetic plate 10, three cylindrical winding shafts 11, 12 and 13 projecting upward are integrally formed. A frame-shaped base 20 made of an insulator is fixed to the side surface of the magnetic plate 10 so as to surround the magnetic plate 10. A bridging portion 25 that crosses over the magnetic plate 10 is integrally formed on the base 20, and a plurality of terminals 21 and 22 are planted on the two opposing side surfaces, respectively. A flexible printed circuit board 30 having two through holes 31, 33 as shown in FIG. 4 is formed on the magnetic plate 10 by inserting the winding shaft 11 into the through hole 31.
The winding shaft 13 is inserted and fixed to the 33. On the printed circuit board 30 in the vicinity of the through hole 33, two terminals 34 with a part of the conductor pattern exposed are provided. A primary winding 35 and a feedback winding 36 of the transformer T are formed on the front and back of the printed circuit board 30 by a spiral conductor pattern connected through through holes (not shown). The feedback winding 36 may not be provided depending on the inverter device. A plurality of electrodes 37 electrically connected to the conductor pattern are provided at one end of the printed circuit board 30, and through holes 38 are formed in the electrodes 37. Printed circuit board
The conductor pattern of 30 has a primary winding 35 and a feedback winding 36 on the upper surface side.
Illustration is omitted except for the electrodes 37, the terminals 34, and the like.

The terminal 21 has a protrusion 21a protruding above the base 10.
Are integrally formed. The printed circuit board 30 is mounted by inserting the protrusion 21a into the through hole 38 of the electrode 37.
21a and the electrode 37 are soldered. Around the reel 12,
A ring-shaped thin insulating sheet 85 is fitted in, and further, a secondary winding 50 on the high voltage side, which is rolled and solidified in a ring shape, is fitted and attached. In the secondary winding 50, in order to increase the withstand voltage, a wire is wound in multiple layers from the inner side to the outer side, and its lead wire 51 is connected to the terminal 22.
Of the two lead wires 51, the inner lead wire 51a is pulled out through the lower side of the insulating sheet 85 to be insulated from the outer portion of the secondary winding 50 having a large potential difference. The bridge portion 25 of the base 20 is located between the secondary winding 50 and the primary winding 35 and the feedback winding 36 so that corona discharge does not occur. The magnetic plate 40 is butted and fixed on the winding shafts 11 and 12 of the magnetic plate 10 to form a closed magnetic circuit, and the primary winding 35 and the feedback winding 36 are electromagnetically coupled to the secondary winding 50. ing. In addition,
An insulating film 80 is attached below the magnetic plate 40 to prevent magnetic saturation. Also, on the winding shaft 13,
A surface connection type choke coil 60 in which a wire is wound around a bobbin 65 and both terminals are connected to electrodes (not shown) under the bobbin 65.
And solder this electrode to the terminal 34,
A cap-shaped magnetic core 70 is covered. Printed board
Circuit parts 90 such as transistors, capacitors and resistors are attached to a conductor pattern (not shown) on the surface of 30.

The inverter device can be easily assembled as follows, for example. First, on the magnetic plate 10 to which the base 20 is attached, the flexible printed circuit board 30 is placed and bonded while passing the winding shafts 11 and 13 through the through holes 31 and 33, respectively, and the projections 21a inserted into the through holes 38 are formed. Solder to the electrode 37. Then, the insulating sheet 85 and the secondary winding 50, which has been wound and solidified in advance, are fitted and attached to the winding shaft 12, and the lead wire is attached.
Connect 51 to terminal 22. At this time, the inner lead wire 51a
Should be pulled out under the seat 85. Similarly,
An imposition type choke coil 60 wound around a bobbin 65
Fit in 13 and connect its electrode to terminal 34. Next, the circuit pattern 90 such as a transistor, a capacitor, and a resistor is mounted on the conductor pattern of the printed board 30. Then, the magnetic plate 40 with the insulating film 80 attached to the lower surface
The core 70 is fixed to the reels 11 and 12, and the core 70 is fixed to the winding shaft 13 to complete the process. The choke coil 60 may be attached to the printed circuit board 30 before being attached to the magnetic plate 10.

The choke coil 60 on the printed circuit board 30
The through hole 33 for use may be formed in a notch shape cut from the side surface of the printed circuit board 30 instead of the through hole. The printed circuit board 30 need only be thin and does not necessarily have to be flexible. The winding shafts 11, 12, and 13 are magnetic plates 10.
Alternatively, the winding shafts 11 and 12 may be provided on the magnetic plate 40 side and the winding shaft 13 may be provided on the core 70 side.

[0010]

According to the present invention, it is possible to obtain a small-sized inverter device in which circuit components are incorporated on a magnetic plate which forms the core of a transformer and which is integrated into one block. The thickness is equal to that of the choke coil, and it can be made extremely thin. Further, there is an effect that the printed circuit board can be easily incorporated and the components can be easily assembled by sequentially stacking the components.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of an inverter device of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of a main part of the inverter device.

FIG. 4 is a plan view of a printed circuit board.

FIG. 5 is a circuit diagram of an inverter device.

[Explanation of symbols]

 10/40 Magnetic plate 11/12/13 Winding shaft 20 Base 30 Printed circuit board 35 Primary winding 37 Electrode 50 Secondary winding 60 Choke coil 70 Magnetic core

Claims (1)

[Claims] 1. Two magnetic material plates (10, 40) which are butted against each other to form a closed magnetic path, and two winding shafts (11) integrally formed on one of the magnetic material plates (10, 40). , 12)
And a through hole (31) around which the primary winding (35) of the transformer is formed by a conductor pattern, and the winding shaft (11) is inserted into the through hole (31) to place the magnetic material plate (10) on it. The printed circuit board (30) fixed to the printed circuit board (30) is aligned and wound in multiple layers from the inside to the outside, and is arranged on the printed circuit board (30) and around the winding axis (12) and electromagnetically coupled to the primary winding (35). The secondary winding (50), the magnetic material plate (10) and the magnetic material core (70) forming a second closed magnetic path, and either the magnetic material plate (10) or the magnetic material core (70). (13) winding shaft integrally formed on the
And a printed circuit board (30) mounted around the winding shaft (13)
A choke coil (60) electrically connected to the upper terminal (34) and an insulating base (20) fixed to the magnetic plate (10) with a plurality of terminals (21, 22) attached. In addition to mounting circuit components (90) such as transistors and capacitors on the conductor pattern of the printed circuit board (30),
The conductor pattern and the secondary winding (50) are connected to predetermined terminals (21,
22) Inverter device characterized by being connected to each.