JPH0431826Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an inverter device including a transformer and a drive circuit thereof.

[Technical background of the invention and its problems] The inverter device as a power supply circuit inputs DC power and obtains an AC output.
Inverter transformer with connected to the primary winding _N1 side
It consists of a TR and an input on the drive circuit side.
The Vin terminal and the ground GND terminal are connected, and the output terminals VF and CT are connected to the secondary winding _N2 side of the transformer.

FIG. 4 shows a perspective view of a device in which the inverter is mounted, in which the inverter transformer 11 is mounted on the wiring board 12, and drive circuit components 15 are mounted on the back surface of the wiring board 12. The wiring pattern 16 is provided by means such as printing. Also, chip parts such as transistors are attached to the back side. From the end of the rectangular wiring board 12, five external connection terminals 13 and 14 are provided so that their heads penetrate the board 12 and protrude downward. They are connected via a wiring pattern 16.
Here, letters indicating the purpose of the terminal, such as "Vin", "GND", "VF", and "CT", are attached to the mounting portion of each terminal.

However, in such conventional devices, a rectangular wiring board 12 is used, and the external connection terminals are implanted at the four corners of the board and in the vicinity thereof in order to stabilize the assembly with other devices. That's what I do. For this reason, there was a problem in that the wiring pattern had to be extended for a long time, which hindered miniaturization of the device. Furthermore, since each external connection terminal must be individually implanted on the wiring board 12, there is a problem in that the number of assembly steps increases.

[Purpose of the invention] The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide an inverter device that is smaller in size and requires fewer assembly steps.

[Summary of the invention] The invention achieves the above object by making the wiring board flexible and arranging it around the transformer, and by using a desired number of terminals provided on the transformer itself as external connection terminals. This is what we are trying to achieve.

[Example of idea] The present invention will be specifically explained below using examples.

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

This device includes a transformer 1 consisting of a drum-shaped magnetic core 1a, a winding 1b wound around the drum-shaped magnetic core, and a bottom plate 1d on which a plurality of terminals 1A to 1D are protruded. Wiring pattern 2c,
2d is formed by printing or the like, and a wiring board 2a is mounted with drive circuit components (transistors, resistors, capacitors, etc.) 2b connected via a wiring pattern.
It is composed of: Here, the wiring board 2a has flexibility so that it can be wound around the drum-shaped magnetic core, and is made of a flexible PC board (wiring board) or the like. External connection lead wires 2e, 2e are connected to the wiring pattern 2c on the outer periphery by soldering or the like.

Also, among the terminals protruding from the bottom plate 1d constituting the transformer 1, the two terminals 1A and 1B on the left side in the figure
are used as the input (Vin) terminal and the grounding (GND) terminal, respectively, and the three terminals 1C, 1D, and 1E on the right side of the diagram are connected to the secondary winding of the transformer, respectively, and the 1C , 1E are used as output terminals (VF), and 1D is used as an intermediate tap terminal (CT) of the output terminal VF.

FIG. 2 is a partially sectional front view showing the assembled state. As shown in the figure, the flexible wiring board 2a is connected to the drum-shaped magnetic core 1a of the transformer 1 and the bottom plate 1.
It is attached with an adhesive or the like so that it is held in contact with the top of the d. At this time, the coil terminals l ₁ and l ₂ of the transformer are connected in advance to the inner surface of the wiring board 2a and the terminal 1C.
The wiring board 2 is connected to the head by soldering etc., and then the wiring board 2 is attached to the circumferential surface of the magnetic core 1a in the above-mentioned order.
The lead wires 2e, 2e are wound and bonded, and then connected to the wiring pattern of the wiring board 2a.
are connected to predetermined terminals (for example, 1A, 1E) and electrically connected by soldering or the like.

The present invention is not limited to the embodiments described above, and various modifications are possible. For example, in the embodiment described above, a cylindrical transformer is used, but a rectangular transformer may be used and the flexible wiring board may be wound accordingly. Furthermore, the method of attaching the flexible wiring board is not limited to the above embodiment, and the entire surface may be wound around the magnetic core,
It may be attached by inserting a predetermined spacer.

[Effects of the invention] According to the invention detailed above, since the wiring board is wound around the main body of the transformer, the size of the entire device is almost the same as the size of the transformer itself, resulting in an extremely small size. can be achieved. In addition, since the terminals provided on the transformer itself are used as external connection terminals, the process for configuring the terminals as in the past is not necessary, and the number of parts is reduced, thereby providing a device that can contribute to reducing assembly man-hours and lowering prices. be able to.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a partially sectional front view showing the assembled state of the inverter, FIG. 3 is a schematic block diagram of a general inverter device, and FIG. 4 is a perspective view of a conventional inverter device. 1...Transformer, 1a...Magnetic core, 1b...Winding, 1d...Bottom plate, 1A to 1E...Terminal, 2...
Inverter drive circuit, 2a...Flexible wiring board, 2b...Circuit components, 2c...Wiring pattern.

Claims (1)

[Scope of utility model registration request] It consists of a transformer consisting of a magnetic core with windings and a bottom plate on which this magnetic core is placed and protruding external connection terminals, and an inverter drive circuit consisting of circuit components and wiring patterns on the front or back side, and is itself flexible. an inverter device comprising: a flexible wiring board having a magnetic core; the flexible wiring board is arranged so as to surround the magnetic core of the transformer; and winding terminals or external connection terminals are electrically connected to the wiring pattern. .