JP2003230254A - Current detector for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact air detector for an air conditioner without needing wiring. <P>SOLUTION: A resin-molded circuit board 1 is provided with a terminal block 2 for a motor for driving a compressor. Each terminal plate 3, 4, and 5 is electrically insulated from one another by insulating walls 7a, 7b, and 7c provided vertically on the surface of the main body of the resin-molded circuit board 1. The terminal plate 5 corresponding to a T phase is constituted of a first terminal plate 5a and a second terminal plate 5b, and a current transformer 10 which detects the current flowing to the above motor is arranged between them, and it is connected to both terminal plate parts 5a and 5b. By doing it this way, the wiring (harness) for connecting the current transformer 10 and the terminal plate 5 becomes needless, and the current detector can be downsized. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting device for an air conditioner that detects a current of a compressor motor in the air conditioner.

[0002]

2. Description of the Related Art Conventionally, a control device for an air conditioner has been
A current transformer is provided to detect the current flowing through the motor that drives the compressor. In this current transformer, the current flowing through the primary winding is used to detect the current flowing through the motor. The microcomputer controls one or more of the rotation speed of the motor, the opening degree of the expansion valve, the rotation speed of the indoor fan, and the rotation speed of the outdoor fan based on the output of the current transformer, This prevents overcurrent from flowing to the motor.

By the way, conventionally, the current transformer is mounted on a printed circuit board for use. In that case,
The terminals for the current transformer, etc. are located away from the printed circuit board on which the current transformer is mounted.
They are connected to each other by (harness).

[0004]

However, the above-mentioned conventional current detecting device for an air conditioner has the following problems. That is, the current transformer that detects the current of the compressor motor is mounted on the printed board, and is connected to the terminal portion by wiring (harness). Therefore, when the mounting position of the current transformer is very far from the terminal portion, the length of the wiring or harness becomes long and the wiring becomes complicated. There is also a problem that the current detection device including the current transformer and the terminal portion mounted on the printed circuit board becomes large in size.

Further, since the current flowing through the primary winding of the current transformer needs to flow through the copper foil on the printed circuit board, when detecting the current of the compressor motor through which a large current of about 60 amperes flows. However, it is necessary to increase the area of the copper foil, which causes a problem of increasing the size of the printed circuit board.

Therefore, an object of the present invention is to provide a compact current detector for an air conditioner that does not require wiring.

[0007]

In order to achieve the above object, a current detecting device for an air conditioner according to the present invention includes a conductive plate forming an electric path, a resin substrate main body including the conductive plate therein, and a resin. A resin molded circuit board that has a plurality of insulating walls that stand upright from the surface of the substrate body and that are spaced apart from each other by a predetermined distance, and is disposed between the insulating walls that face each other.
Alternatively, a plurality of terminal boards are provided, and at least one of the terminal boards comprises a first terminal board part and a second terminal board part, and
A transformer for current detection electrically connected to the first terminal plate portion and the second terminal plate portion is arranged between the first terminal plate portion and the second terminal plate portion. .

According to the above construction, one or a plurality of terminal plates are arranged between the insulating walls on the resin molded circuit board having a plurality of insulating walls on the surface of the resin substrate main body including the conductive plate therein, The resin molded circuit board and the terminal portion are integrally formed. Then, at least one terminal plate is composed of a first terminal plate portion and a second terminal plate portion, and a transformer for current detection is arranged and electrically connected between them. Therefore, a wiring (harness) for connecting the transformer and the terminal plate is not necessary, and the current detecting device including the transformer and the terminal portion is downsized.

In one embodiment, in the current detecting device for an air conditioner according to the present invention, each part of the first terminal plate portion and the second terminal plate portion is embedded in the resin substrate body, and It is a tubular portion that is located below the transformer and stands upright, and the terminals of the transformer are inserted into the tubular portion and electrically connected.

According to this embodiment, a part of the first terminal plate portion and the second terminal plate portion is embedded in the resin substrate body and forms a cylindrical portion that stands up. Therefore, a recess is formed at the joint between the tubular portion and the terminal of the transformer on the back surface of the first terminal plate portion and the second terminal plate portion, and a solder for connecting the tubular portion and the terminal is formed. The amount increases. Therefore, the transformer is firmly connected to the first terminal plate portion and the second terminal plate portion.

Further, in one embodiment, in the current detecting device for an air conditioner of the present invention, ribs are provided on the surface of the resin substrate body in the resin molded circuit substrate.

According to this embodiment, ribs are provided on the resin molded circuit board. Therefore, warpage or bending of the resin molded circuit board is prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a configuration diagram of a current detection device for an air conditioner according to the present embodiment. Incidentally, FIG.
1 (a) is a plan view, and FIG. 1 (b) is an arrow B in FIG. 1 (a).
It is the side view seen from the direction.

The terminal block 2 for the motor that drives the compressor is
It is provided on the resin molded circuit board 1. This resin molded circuit board 1 is mounted with electronic parts (not shown),
The surface of a conductive plate (not shown) forming an electric path is covered with an insulating resin (resin substrate main body) by resin molding to form a plate.

In the present embodiment, in order to detect a large current of about 60 amps flowing through the compressor motor, it is not a printed circuit board unsuitable for detecting a large current as described above. It is premised that the resin molded circuit board 1 is provided with a current detection device.

Further, the terminal block 2 has a terminal 3 for the motor.
Three terminal boards 3, 4, 5 corresponding to the R phase, the S phase, and the T phase of the phase wiring are attached and fixed to the resin molded circuit board 1 and are erected substantially perpendicularly to the surface of the resin board body. The installed insulating walls 7a, 7b, 7c, 7d are configured to be structurally and electrically separated from each other between the terminal plates 3, 4, 5 to form a schematic structure. Then, the terminal plate 5 corresponding to the T phase includes the first terminal plate portion 5a and the second terminal plate portion 5a.
The terminal plate portion 5b and one side of each of the terminal plates 3 and 4 and the first terminal plate portion 5a are provided with terminals (not shown) connected to a three-phase power source by screws 8a, 8b and 8c. Connected. on the other hand,
Terminals (not shown) connected to the compressor motor (not shown) are connected to the other side of each of the terminal plates 3 and 4 and the second terminal plate portion 5b with screws 9a, 9b and 9c. It

Further, in the present embodiment, the first
A current transformer 10 for detecting a current flowing through the motor is installed between the terminal plate portion 5a and the second terminal plate portion 5b, and the connection terminals thereof are the first terminal plate portion 5a and the second terminal plate portion. It is connected to 5b. As described above, since the current transformer 10 is installed on the terminal plate 5 and is electrically connected directly to the terminal plate 5, the wiring (harness) for connecting the current transformer 10 and the terminal plate 5 is not necessary. Further, the current detecting device including the current transformer 10 and the terminal block 2 can be downsized. Further, the primary winding of the current transformer 10 is connected to the first terminal plate portion 5a formed of a metal plate having a thickness larger than that of the copper foil of the printed circuit board. Therefore, the current flowing through the primary winding / the connection terminal area can be increased, and a large current of about 60 amperes required for the motor can be passed. As a result, the problem that the size of the printed circuit board becomes large due to the installation of the current detection device can be solved.

Further, plate-shaped ribs 11 and 12 extending in the vertical direction are provided on the resin substrate body of the resin molded circuit substrate 1 provided with the terminal block 2 in the present embodiment. 1 end parallel to the edge and terminal block 2
And another terminal block 13 are provided so as to be connected at both ends. By doing so, it is possible to prevent the resin molded circuit board 1 from warping or bending due to the weight of the terminal block 2 or the like.

FIG. 2 is a sectional view taken along the line AA 'in FIG. 1 (a). In FIG. 2, one end portion 1 of the first terminal plate portion 5a
5 penetrates the hole provided in the resin molded circuit board 1,
It is attached and fixed to the metal conductive plate 16 of the resin molded circuit board 1 with solder 17. On the other hand, the other end portion 18 of the first terminal plate portion 5 a is embedded in the resin board body of the resin molded circuit board 1 and is located below the current transformer 10. Then, as shown by the broken line circle C, the cylindrical portion 19 that stands up is provided, and so-called burring processing is performed. Then, the current transformer 1 is provided in the tubular portion 19.
The rod-shaped connection terminal 20 of No. 0 is inserted, and the cylindrical portion 19 and the connection terminal 20 are soldered from the rear surface side of the resin molded circuit board 1 to the solder 2
It is connected and fixed by 1. Although not described in detail, the second terminal plate portion 5b and the other connection terminal of the current transformer 10 are connected to the second terminal plate portion 5b by the burring process as in the case of the first terminal plate portion 5a. Is performed.

In this manner, the end portions 18 of the first terminal plate portion 5a and the second terminal plate portion 5b embedded in the resin substrate body are subjected to burring processing for forming the tubular portion 19 which is erected upward. As a result, since the concave portion is formed in the portion where the solder 21 is piled up, the amount of the solder 21 is increased, and the connection between the first terminal plate portion 5a and the second terminal plate portion 5b of the current transformer 10 can be strengthened. You can do it. At that time, the end portion 18 of the first terminal plate portion 5a and the end portion of the second terminal plate portion 5b are embedded in the resin substrate body, and the upper end of the tubular portion 19 is the same as the upper surface of the resin substrate body. It is high. Therefore, the connection terminal 20 can be inserted into the tubular portion 19 more easily than when the upper end of the tubular portion 19 is lower than the upper surface of the resin substrate body. 22
Is a hole provided with a female screw into which the screw 8c provided on the first terminal plate portion 5a is screwed.

As described above, in the present embodiment, the terminal block 2 for the motor for driving the compressor is provided on the resin molded circuit board 1, and the resin molded circuit board is placed between the respective terminal plates 3, 4, 5. Insulating walls 7a, 7b, 7c, 7 provided perpendicular to the surface of 1
It is electrically separated by d. The terminal 5 corresponding to the T phase is composed of a first terminal plate portion 5a and a second terminal plate portion 5b, and a current transformer 10 for detecting a current flowing through the motor is installed between the terminals 5 and It is connected to the first terminal plate portion 5a and the second terminal plate portion 5b. Therefore, the wiring that connects the current transformer 10 and the terminal 5
(Harness) is not necessary and the current detection device can be made compact. Further, the primary winding of the current transformer 10 is a first winding formed of a thick metal plate.
Since it is connected to the terminal plate portion 5a, it becomes possible to flow a large current of about 60 amps required for the motor.

At this time, the connection between the first terminal plate portion 5a and the second terminal plate portion 5b with the connection terminal 20 of the current transformer 10 is made by connecting the end portions of the first terminal plate portion 5a and the second terminal plate portion 5b. Is embedded in the resin substrate main body of the resin molded circuit board 1 and the connecting terminal 20 of the current transformer 10 is inserted into the tubular portion 19 which is erected upward and connected by solder 21 from the back surface. . Therefore, since the recesses are formed in the back surface of the first terminal plate portion 5a and the second terminal plate portion 5b where the solder 21 is filled, the amount of the solder 21 is increased, and the first terminal plate portion 5a of the current transformer 10 and The connection to the second terminal plate portion 5b can be strengthened. Further, ribs 11 and 12 are provided on the resin molded circuit board 1 so as to be parallel to the edge and to connect the terminal block 2 and the other terminal block 13. Therefore, it is possible to prevent the resin molded circuit board 1 from warping or bending.

In the above embodiment, the resin molded circuit board 1 provided with the terminal block 2 is subjected to burring processing. However, the burring process is not limited to the compressor motor terminal portion of the resin-molded circuit board 1, and other terminal portions of the resin-molded circuit board 1 and
The conductive plate may be provided on an ordinary circuit board formed on the surface of the resin substrate, which may be used. Further, although cases have been described with the above embodiment as examples where the present invention is applied to three-phase wiring, the number of phases is not limited to three, and a single phase or two phases may be used. Further, the current transformer 1 is provided between the first terminal plate portion 5a and the second terminal plate portion 5b of the terminal plate 5 for one phase.
However, the current transformer 10 may be provided between the first and second terminal plate portions of the terminal plates for a plurality of phases.

[0024]

As is apparent from the above, the current detecting device for an air conditioner according to the present invention has a resin board main body having a conductive plate inside and a resin molded circuit board having a plurality of insulating walls. One or a plurality of terminals are provided between them, and at least one terminal plate is composed of a first terminal plate portion and a second terminal plate portion, and a current is detected between the first terminal plate portion and the second terminal plate portion. Since the transformer for electric power is arranged and electrically connected to the first and second terminal plate portions, the wiring (harness) for connecting the transformer and the terminal plate is not necessary. Further, the current detecting device including the transformer and the terminal portion can be made compact.

In the current detecting device for an air conditioner according to the first embodiment, a part of each of the first terminal plate portion and the second terminal plate portion is embedded in the resin substrate body, and below the transformer. It stands up upwards to form a tubular part, and the terminals of the transformer are inserted into this tubular part for electrical connection.
It is possible to increase the amount of the solder by forming a recess in the back surface of the first terminal plate portion and the second terminal plate portion where solder is deposited. Therefore, the connection of the transformer to the first terminal plate portion and the second terminal plate portion can be strengthened.

Further, in the current detecting device for the air conditioner of the one embodiment, since the rib is provided on the surface of the resin substrate main body of the resin molded circuit board, it is possible to prevent the resin molded circuit board from warping or bending. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a current detection device for an air conditioner of the present invention.

FIG. 2 is a sectional view taken along the line AA ′ in FIG.

[Explanation of symbols]

1 ... Resin molded circuit board, 2,13 ... Terminal block, 3,4 ... Terminal board, 5a ... 1st terminal board part, 5b ... second terminal plate portion, 7a, 7b, 7c, 7d ... Insulating wall, 8a, 8b, 8c, 9a, 9b, 9c ... screws, 10 ... Current transformer, 11,12 ... ribs, 16 ... Conductive plate, 17,21 ... Solder, 19 ... Cylindrical part, 20 ... Connection terminal of current transformer.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hirokazu Hayashi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Yoshio Kurahashi             1277 after Mayor of Fujisawa, Kanagawa             Line Industry Co., Ltd. (72) Inventor Morokuni Natsume             1304 Kanaoka-cho, Sakai City, Osaka Prefecture Daikin Industries             Sakai Plant Kanaoka Factory F-term (reference) 2G035 AA00 AB08 AC13 AD19                 3L061 BA02                 5H611 AA01 BB01 BB08 PP02 QQ05                       RR00 TT01 UA04 UB01

Claims (3)

[Claims] 1. A conductive plate (16) forming an electric path, a resin substrate main body containing the conductive plate (16) therein, and a plurality of resin plates standing upright from the surface of the resin substrate main body and having a predetermined interval from each other. A resin molded circuit board (1) having insulating walls (7a, 7b, 7c, 7d) and one or a plurality of terminal plates (1) arranged between the insulating walls (7a, 7b, 7c, 7d) facing each other. 3, 4, 5), and at least one of the terminal plates (3, 4, 5) is a first terminal plate part.
(5a) and a second terminal plate portion (5b), and between the first terminal plate portion (5a) and the second terminal plate portion (5b), the first terminal plate portion (5a) A current detecting device for an air conditioner, comprising a current detecting transformer (10) electrically connected to the second terminal plate portion (5b). 2. The current detecting device for an air conditioner according to claim 1, wherein each part of the first terminal plate portion (5a) and the second terminal plate portion (5b) is embedded in the resin substrate body. And a cylindrical portion that is positioned below the transformer (10) and is erected upward.
(19), and the transformer (10) in the tubular portion (19).
A current detecting device for an air conditioner, in which the terminal (20) is inserted and electrically connected. 3. The current detecting device for an air conditioner according to claim 1 or 2, wherein ribs (11, 12) are provided on the surface of the resin substrate body of the resin molded circuit substrate (1). A current detecting device for an air conditioner, which is characterized in that: