JP4685623B2 - Current detection mechanism and assembly method for configuring the current detection mechanism - Google Patents

Description

The present invention relates to a current detection Organization, and more particularly, in order to detect the current flowing to the measured current conductors wired in the instrument, each of the components by utilizing existing wiring and junction with reducing the size of the current detection device as little to possible easily about the current detector configuration that enables the assembly.

  In recent years, inverter vector control technology that has been used in industrial inverters and the like has been widely used in home appliances such as air conditioners since the 1999 revision of the Energy Conservation Law. In vector control, it is essential to detect the current of each UVW phase in order to estimate the position of the magnetic pole. Hall CT type current sensors with little heat loss are widely used for current detection (see, for example, Patent Document 1).

  In the current sensor described in Patent Document 1, a bus bar that is a current conductor to be measured that penetrates a core that collects magnetic flux from a current is prepared. This bus bar is connected in series to the end of the current conductor to be measured in the device.

  Further, for example, the current sensor described in Patent Document 2 is provided with a coil-shaped current conductor to be measured wound around a core, and both ends of the coil-shaped current conductor to be measured are respectively current current conductors inside the apparatus. It is connected in series to the end.

  The layout of the current conductor to be measured in the device is designed based on the dimensions of these current sensors, the bus bar attached to the current sensor, and the coiled current conductor to be measured.

JP 2002-243768 A JP-A-9-243667

  However, in the detection of the current value to be measured by the current sensor as in the past, the current conductor pattern to be measured and the arrangement in the device are limited by the size of the current sensor and the current conductor to be measured attached to the current sensor. Since it is necessary to prepare and install a current conductor to be measured that penetrates the core built into the current sensor, it takes time to install the current sensor, and it is difficult to reduce the size of the printed wiring board in the device. There is a problem that a voltage drop occurs in the current conductor pattern to be measured because the routing becomes long.

The present invention has been made in view of such a problem, and the object of the present invention is to use a joint portion of an existing current conductor to be measured that is wired in a device, and to provide a magnetic sensor and a magnetic member around the periphery. By constructing a current detection mechanism consisting of a support member or connector member that facilitates the attachment of the body core and these parts, the current detection unit is reduced in size and occupied area, and is generally used in the past. and so-called without the use of components called "current sensor", it is to provide a current detector configuration that allows the possible assembly of the current detecting mechanism easily users by fewer components.

The present invention has been made to achieve such an object. The invention according to claim 1 is directed to a printed wiring board having a current conductor pattern to be measured and an electrical connection to the current conductor pattern to be measured. A first joint portion, a second joint portion that is detachable and electrically connectable with the first joint portion, and the first joint portion and the second joint portion constitute a joint portion. And a magnetic core having at least one air gap so as to surround the joint, and a magnetic sensor disposed in the air gap , wherein the second joint is connected to the current conductor wire to be measured. It is connected .

  According to the present invention, a support member or a connector member that uses a joint portion of an existing current conductor to be measured wired in an apparatus and facilitates mounting of a magnetic sensor, a magnetic core, and these components on the periphery thereof By configuring the current detection mechanism, the current detection unit can be reduced in size and occupied area, and the user can easily assemble the current detection mechanism with fewer components. In addition, since the current detection mechanism is configured using the junction of the current conductor under measurement, the layout of the current conductor under measurement inside the equipment is more flexible and the wiring can be minimized. Therefore, voltage drop due to wiring routing can be suppressed.

  In particular, when the current to be measured is connected to an electronic component mounted on a printed circuit board, the resistance of the conductor pattern and the heat generated by the current to be measured flowing there become a big problem, and the current value that can be passed is limited. However, by using this method, the length of the current conductor pattern to be measured can be made zero or the shortest, which greatly contributes to downsizing and power saving of the apparatus. In addition, the degree of freedom of arrangement of other signal line patterns on the printed wiring board can be increased, and by minimizing the signal line pattern, the influence of noise and the like can be reduced and the reliability can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

1A and 1B are configuration diagrams for explaining a first embodiment of the current detection mechanism of the present invention. FIG. 1A is a side view and FIG. 1B is an assembled perspective view. is there.
The printed wiring board 16 is provided in a device having a current conductor pattern to be measured. The current conductor pins 10a and 10b to be measured are configured to be joined to each other. The measured current conductor pin 10 a is mounted on the measured current conductor pattern on the printed wiring board 16, and the measured current conductor pin 10 b is attached to the measured current conductor wire 15. The magnetic sensor 14 is mounted on the printed wiring board 16. The magnetic core 13 includes a gap portion 13a and a central through hole 13b.

  Further, the connector member 11 accommodates the current conductor pin 10b to be measured. The support member 12 supports the magnetic core 13. A through hole 12c that penetrates the current conductor pin 10a to be measured is provided at the center of the support member 12. Further, a projecting fitting portion 12 a is provided which is provided adjacent to the through hole 12 c of the support member 12.

  Further, the magnetic core 13 is supported and fixed by the fitting portion 12a of the support member through the central through hole 13b. The locking portion 12 b is for locking the printed wiring board 16 and the support member 12.

  The above-described magnetic sensor 14 is desirably a Hall element using the Hall effect. In addition, the shape of the magnetic core 13 is a quadrangular shape in the drawing, but is not limited thereto, and may be a ring shape or a polygonal shape. Furthermore, in order to increase the saturation magnetic flux density, it is desirable that the corner portion is chamfered with an arc shape. Further, as the material of the magnetic core 13, permalloy, ferrite, silicon steel plate, electromagnetic soft iron or the like is used.

  As materials for the connector and the support member, PBT, ABS, Duracon, polyester, PPO, polyamide, PPS, nylon 66, and the like are conceivable.

FIG. 3 is a flowchart illustrating the method for assembling the current detection mechanism according to the first embodiment.
First, the magnetic sensor 14 and the current conductor pin 10a to be measured are solder mounted on the printed wiring board 16 (step 1). Next, the support member 12 is attached to the printed wiring board by the locking portion 12b. The current conductor pin 10a to be measured is passed through the through hole 12c of the support member 12 (step 2).

  Next, the magnetic core 13 is attached to the support member 12. The magnetic core 13 is supported and fixed by the fitting portion 12a. The magnetic sensor 14 is disposed so as to be positioned in the gap 13a of the magnetic core 13 (step 3).

  Next, the connector member 11 is inserted into the central through hole 13b of the magnetic core 13, and the measured current conductor pins 10a and 10b are joined (step 4).

  The support member 12 may be a connector member having a fitting portion 12a for supporting the magnetic core 13 and already storing the current conductor 10a to be measured. In this case, the support member 12 is connected to the printed wiring board 16. Step 2 attached to can be omitted.

  FIG. 2 is an assembly perspective view for explaining a second embodiment of the current detection mechanism of the present invention, in which two current conductors to be measured are joined by screwing a crimp terminal to a terminal block. It is an assembly perspective view of a mechanism.

  The printed wiring board 26 is provided in the device, and has a current conductor pattern to be measured thereon. The terminal block 20 has four legs and is solder-mounted on the current conductor pattern to be measured on the printed wiring board 26. Similar to the terminal block 20, the magnetic sensor 24 is solder-mounted on the current conductor pattern to be measured on the printed wiring board 26.

  The support member 22 is attached to the printed wiring board 26 by a locking portion 22b provided on the side portion. At that time, the terminal block 20 is penetrated through a through hole 22 c provided in the center of the support member 22. Further, the support member 22 includes a protrusion-like fitting portion 22a erected adjacent to the through hole 22c. Similar to the magnetic core shown in FIG. 1, the magnetic core 23 includes a gap 23 a and a central through hole 23 b. The crimp terminal 25a is screwed to the terminal block 20 with a screw 25b, and is configured to join both current conductors to be measured.

  FIG. 4 is a flowchart illustrating a method for assembling the current detection mechanism according to the second embodiment.

  First, the magnetic sensor 24 and the terminal block 20 are solder mounted on the wiring pattern on the printed wiring board 26 (step 1). Next, the support member 22 is attached to the printed wiring board 26 by the locking portion 22b. The terminal block 20 is penetrated through the through hole 22c of the support member 22 (step 2).

  Next, the magnetic core 23 is attached to the support member 22. The magnetic core 23 is supported and fixed by a protruding fitting portion 22a. The magnetic sensor 24 is disposed so as to be positioned in the gap portion 23a of the magnetic core (step 3).

  Next, the crimp terminal 25a is screwed to the terminal block 20 with a screw 25b, and the two current conductors to be measured are joined (step 4).

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram for demonstrating Example 1 of the electric current detection mechanism of this invention, (a) is a side view, (b) is an assembly perspective view. It is an assembly perspective view for demonstrating Example 2 of the electric current detection mechanism of this invention. It is a figure which shows the flowchart for demonstrating the assembly method of the electric current detection mechanism based on Example 1. FIG. It is a figure for demonstrating the assembly method of the electric current detection mechanism based on Example 2. FIG.

Explanation of symbols

10a, 10b Current measured conductor pin 11 Connector member 12, 22 Support member 12a, 22a Fitting portion 12b, 22b Locking portion 12c, 22c Through hole 13, 23 Magnetic core 13a, 23a Air gap portion 13b, 23b Central through hole 14 and 24 Magnetic sensor 15 Current conductor wire 16 and 26 to be measured Printed wiring board 20 Terminal block 25a Crimp terminal 25b Screw

Claims (1)

  A printed wiring board having a current conductor pattern to be measured, a first joint electrically connected to the current conductor pattern to be measured, and a second that can be detached from and electrically connected to the first joint. A magnetic core having at least one void portion so as to surround the periphery of the bonding portion, and a gap between the first bonding portion and the second bonding portion, A current detection mechanism, wherein the second joint is connected to a current conductor wire to be measured.

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