JP2014146545A - Printed circuit board mounting terminal block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a printed circuit board mounting terminal block which can detect heat generation of a terminal composing a wire connection terminal block on a printed circuit board at low cost.SOLUTION: A printed board mounting terminal block comprises: a terminal including a beam part 1d having a plurality of wire connection parts 1b to which wires are attached and leg parts 1c for supporting the beam part 1d; and a printed circuit board 9 having a soldering part copper foil pattern to which the leg parts 1c are soldered, for electrically connecting the wires attached to the wire connection parts 1b with each other. The printed board mounting terminal block comprises: a copper foil pattern 3 for temperature detection element mounting arranged on the printed circuit board 9 so as to ensure an insulation creepage distance with the soldering part copper foil pattern 2; a temperature detection element 4 soldered to the copper foil pattern 3 for temperature detection element mounting; and a connector 5 for outputting a measurement result by the temperature detection element 4 to the outside, in which the temperature detection element 4 detects a temperature change caused by heat generated due to a poor contact at the wire connection part 1b.

Description

  The present invention provides a low-cost method for generating heat from a terminal fitting that constitutes a terminal block for wire connection on a printed circuit board as a method for configuring a device stop when an abnormal heat is generated at a wire connection portion in an electrical device that involves power supply wire connection work. And a technique for obtaining an insulating creepage distance securing insulator installed around the terminal fitting at a low cost.

  In power semiconductor equipment, power supply wiring for the power input section and equipment output wiring are required, such as input / output voltage / current wiring connection according to the equipment. A screw-clamping terminal block provided with a fast-connecting terminal block and a configuration for connecting a connector are used. In these terminal block configurations, for example, power semiconductor devices such as inverters use many products with input / output voltages and powers of several hundreds and several kW, and handle large currents. In general, connecting electric wires between a power source and a device and between a device and a load are performed.

  However, wire connection work requires appropriate skills using appropriate wire terminals and designated tools, and screw terminal blocks require screw tightening torque management and work inspection, etc. Aged deterioration due to terminal block heat generation due to poor contact in the connection construction department. In response to these heat generation and smoke accidents, there has been a demand for equipment manufacturers for safe self-stop methods.

  For example, a resin-molded terminal block in which a thermal fuse is mounted on the terminal block has been proposed as a connection part safety measure structure for such a wire connection terminal block. Patent Document 1 discloses a configuration in which an electric wire and a terminal fitting for connecting the electric wire and a thermal fuse are incorporated in a resin block and heat is transferred to the thermal fuse.

Japanese Patent No. 3676256

  In the configuration disclosed in Patent Document 1, when a current flows with the terminal screw loosened, the resistance between the electric wire and the terminal fitting increases, so the terminal fitting generates heat and is transmitted to the thermal fuse. Heat and detect abnormalities. However, this structure is expensive because the main body structure is resinous, and it can be modified to meet the requirements for branch wiring according to the performance and functions of various functions, as well as the need for multiple terminal blocks and mounting structures. It was difficult and it was difficult to provide the thermal fuse at a low cost because of the complexity.

In this way, the wire connection terminal block configuration with the temperature detection element in the terminal block is simple to use, so the functional design of the terminal block alone is easy, and custom-made products and safety are required. It has been possible to use it partially in equipment. However, this structure is suitable for a terminal block structure when multiple terminals are required in parallel, and for applications to be used according to various voltage, current, and ambient temperature conditions. And the terminal block diameter needs to be changed according to the terminal block connection current capacity. It was.

  In addition, since it is necessary to check the temperature to prevent ignition etc. and the temperature to prevent malfunction due to high ambient temperature and current due to operating current as the detection operating temperature, the temperature fuse is changed to a temperature detection element. There is also a method for setting the temperature corresponding to the ambient temperature using an electronic circuit. However, using the same method for multiple terminal blocks requires a wiring for the temperature detection element, which makes it extremely expensive. was there.

  This invention is made in view of the above, Comprising: It aims at obtaining the printed circuit board mounting terminal block which can detect the heat_generation | fever of the terminal metal fixture which comprises the terminal block for electric wire connection on a printed circuit board at low cost.

  In order to solve the above-described problems and achieve the object, the present invention provides a terminal fitting including a girder having a plurality of wire connection portions to which electric wires are attached, and a leg that supports the girder, and the leg is soldered. A printed circuit board mounting terminal block for electrically connecting the electric wires attached to the electric wire connection portion of the terminal fitting mounted on the printed circuit board, including a printed circuit board having a first conductor pattern to be attached, A second conductor pattern disposed on the printed circuit board while ensuring an insulation creepage distance from the first conductor pattern; a temperature sensing element soldered to the second conductor pattern and mounted on the printed circuit board; and a temperature A connector mounted on a printed circuit board for outputting the measurement result of the sensing element to the outside, and is generated due to poor contact at the wire connection part, and the leg part, the first conductor pattern, the printed circuit board, and The temperature change due to heat transmitted to the temperature sensing element through the second conductor pattern, the temperature sensing element and detecting.

  Advantageous Effects of Invention According to the present invention, there is an effect that heat generation of a terminal metal fitting constituting a wire connection terminal block can be detected on a printed board at a low cost.

FIG. 1 is a diagram showing a configuration of an embodiment of a printed circuit board mounting terminal block according to the present invention. FIG. 2 is a diagram illustrating an example of an insulating creepage distance securing insulator used around the terminal block.

  Embodiments of a printed circuit board mounting terminal block according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
1A and 1B are diagrams showing the configuration of an embodiment of a printed circuit board mounting terminal block according to the present invention. FIG. 1A is a top view, and FIG. 1B is an Ib-Ib line in FIG. FIG. The terminal fitting 1 is formed to have a girder portion 1d and a leg portion 1c by, for example, press molding an electric conductor (brass or the like). The girder 1d has two wire connection portions 1b, and each of the wire connection portions 1b is provided with two screw holes for screwing the terminal fixing screws 1a. The terminal fitting 1 is fixed to the printed circuit board 9 by soldering the leg part 1 c to the soldering portion copper foil pattern (first conductor pattern) 2 of the mounting hole on the printed circuit board 9. On the printed circuit board 9, in order to detect the temperature of the soldering part copper foil pattern 2, a soldering part copper foil pattern 2 and an insulation creepage distance are secured, and a temperature sensing element mounting copper foil pattern (second conductor) Pattern) 3 is installed, and a temperature detection element 4 (for example, a thermistor) is mounted on the temperature detection element mounting copper foil pattern 3 by soldering. A connector 5 is disposed on the printed circuit board 9 for output from the temperature detection element 4 to the outside.

  The heat generated in the electric wire connecting portion 1b is transferred to the soldering portion copper foil pattern 2 through the leg portion 1c, and is transferred to the temperature detecting element 4 through the printed board 9 and the copper foil pattern 3 for mounting the temperature detecting element. When the temperature detecting element 4 measures the temperature above, the temperature detecting element 4 functions as a means for detecting an abnormal temperature of the terminal fitting 1 due to a defective wire connection work. As shown in FIG.1 (b), by expanding the soldering part copper foil pattern 2 to the side which does not overlap with the digit part 1d, and arrange | positioning the temperature detection element mounting copper foil pattern 3 on the back of the enlarged part. The soldering portion copper foil pattern 2 and the temperature sensing element mounting copper foil pattern 3 can be brought close to each other while ensuring the insulation creepage distance, and the temperature sensing element 4 detects the abnormal temperature of the terminal fitting 1. Accuracy can be increased.

  An electronic circuit that controls a device to which the printed circuit board mounting terminal block is applied is connected to the temperature detection element 4 through a connector 5. The electronic circuit for controlling the device is provided with means for determining abnormal heat generation of the wire connection terminal block from the temperature measured by the temperature detection element 4 and various control state information. By interrupting the current that flows through the terminal block and displaying an abnormality, the abnormal heat generation detection function of the printed circuit board terminal block can be realized at low cost and safety is ensured. The correlation between the temperature of the digit part 1d and the temperature measured by the temperature detection element 4 is checked and recorded in advance, and the electronic circuit performs control to cut off the current based on the temperature measured by the temperature detection element 4. Even if the temperature detecting element 4 does not measure the temperature of the terminal fitting 1 itself, it is possible to realize a function of detecting abnormal heat generation in the wire connecting portion 1b.

  That is, the printed circuit board mounting terminal block according to the present embodiment uses the terminal fitting 1 soldered to the soldered portion copper foil pattern 2 of the terminal mounting hole on the printed circuit board 9 as a temperature detection heat transfer body, By providing the temperature sensing element 4 in the part close to the copper foil pattern 2 of the attachment part, a structure for detecting abnormal heating due to contact failure in the wire connection part is realized, and the abnormality of the wire connection terminal block It is possible to improve the temperature detection function during heating at low cost.

  FIG. 1 shows an example of use as a device output terminal, and a device manufacturer connects an output wire terminal of a device to a terminal fitting 1 before shipment. In the installation work, the load wire terminal is similarly connected to the terminal fitting 1. Since the soldering part copper foil pattern 2 for mounting the terminal fitting 1 on the printed circuit board 9 is not short-circuited, the output current of the device flows from the output wire terminal of the device to the load wire terminal via the terminal fitting 1. No current flows through the solder connection portion 2a on the printed circuit board 9. In other words, since the soldered portion copper foil pattern 2 is not connected to other wirings (other conductive patterns) on the printed circuit board 9 and is independent, a current is supplied to the solder connecting portion 2a on the printed circuit board 9. Not flowing.

  Since no current flows through the solder connection portion 2a on the printed circuit board 9, the solder connection for mounting the terminal fitting 1 is performed by the torque for tightening the terminal fixing screw 1a when attaching the wire terminals to the terminal fitting 1. Even when mechanical stress is applied to the portion 2a and the solder breaks in the solder connection portion 2a, it is possible to prevent the discharge at the solder break portion when abnormal heating occurs due to poor contact of the terminal connection portion. Since the current flows only in the terminal fitting 1, an inexpensive substrate having low heat resistance and ignition resistance can be used as the printed circuit board 9.

  The terminal fitting 1 having a plurality of wire connection portions 1b is fixed to the printed circuit board 9 by soldering. However, the solder breakage of the solder connection portions 2a can be prevented by not passing a current through the wiring pattern on the printed circuit board 9. It is possible to prevent the ignition of time. Thereby, for example, an inexpensive board having a low soldering strength such as a single-sided conductor pattern can be used as the printed board 9.

  In addition, in FIG. 1, although the terminal metal fitting 1 which has two electric wire connection parts 1b is shown as an example, it is easy to branch terminal by providing the terminal metal fitting 1 with three or more screw holes for screwing the terminal fixing screw 1a. It can also be made into a bracket. Moreover, it is possible to change the detection method of the temperature detection element 4 according to the method of setting the continuous heat resistant temperature of the printed circuit board 9 as the abnormal temperature of the temperature detection element 4 or the safety requirement level of the device and the ambient temperature. Needless to say. Furthermore, it is easy to configure self-verification by comparing the relative temperature by using the current change information of the current flowing through the wire connection terminal block and using the temperature change at the time of current increase / decrease as an abnormality detection parameter. For example, when the current flowing through the terminal fitting 1 is 10 A, if a temperature rise of 5 ° C. is detected based on the measurement result of the temperature detection element 4, it is determined that there is no abnormality and the temperature rise of 10 ° C. is detected. In some cases, it can be used to determine that there is an abnormality. In addition, a plurality of sets of the terminal metal fittings 1 and the temperature detection elements 4 are arranged on the printed circuit board 9, and the plurality of temperature detection elements 4 are stopped so that the apparatus is stopped when any one of the temperature detection elements 4 reaches the abnormal temperature detection level. It goes without saying that various types of control circuits can be easily developed, such as taking a circuit form that detects only the maximum value of the power output.

  Further, in FIG. 1, the terminal fitting 1 having two legs 1c is illustrated, but the terminal fitting 1 has four legs 1c (the leg portions 1c are arranged in the four directions of the girder 1d in the developed view). (Position to be located).

  2A and 2B are diagrams showing an example of an insulating creepage distance securing insulator used around the terminal block. FIG. 2A is a top view and FIG. 2B is a side view. In the configuration in which the terminal fitting 1 is fixed to the printed circuit board 9 by soldering, after the terminal fitting 1 is temporarily fixed to the insulating creepage distance securing insulator 6 used around the terminal block, the terminal fitting 1 is attached to the printed circuit board 9. By fixing the insulating creepage distance ensuring insulator 6 between the terminal block and the printed circuit board 9, the insulating creeping distance ensuring insulator 6 can be mounted around the terminals. In FIG. 2, the terminal fitting 1 is placed in a state where the leg portion 1 c is passed through the top plate portion 6 a of the insulating creepage distance securing insulator 6, and is used for temporarily fixing the terminal bracket of the insulating creepage distance securing insulator 6. Temporarily fixed in a state of being sandwiched between the claw portion 7 and the top plate portion 6a. The insulating creeping distance ensuring insulator 6 has a partition wall 6b, and the insulating creeping distance between the terminal fittings 1 is secured by the partition wall 6b. The terminal fitting 1 is mounted on the printed circuit board 9 in a temporarily fixed state and soldered to the printed circuit board 9. By this soldering, the insulation creeping distance ensuring insulator 6 is finally fixed between the terminal fitting 1 and the printed circuit board 9, and the insulation creeping distance securing insulator 6 can be prevented from falling off.

  Since the printed circuit board mounting terminal block has the temperature detecting element 4, it is possible to use a thermoplastic material having a relatively low heat resistance for the insulating creeping distance securing insulator 6, and the insulating creeping distance securing insulator. 6 can be manufactured in a connected state, and can be easily cut and used according to the number of terminals used. The insulating cut surface 8 for securing the insulation creepage distance in FIG. 2 shows this cut portion.

  When a plurality of terminal fittings 1 are used, the insulation creepage distance securing insulator 6 for securing the insulation distance between the terminal fittings 1 is formed in a shape that can be temporarily fixed to the terminal fitting 1, and the terminal fitting 1 is printed on a printed circuit board. By fixing the insulating creepage distance securing insulator 6 to the printed circuit board 9 by soldering to the terminal 9, the terminal fitting 1 can be easily attached / detached before being soldered to the printed circuit board 9.

  According to the present embodiment, by installing the temperature detection element 4 in the vicinity of the attachment portion on the printed circuit board 9 of the terminal fitting 1 having a plurality of wire connection portions 1b, the abnormality of the terminal fitting 1 is also found in a plurality of wire wirings. A heat generation detection function can be installed at low cost. Further, in order to dispose a plurality of terminal fittings 1 on the printed circuit board 9 with high density, an insulating creepage distance securing insulator 6 that can be easily attached is attached to the terminal fitting 1, and the terminal fitting 1 is soldered to the printed circuit board 9. In the configuration to be finally fixed by attaching, since the temperature detecting element 4 is provided, it is possible to use an inexpensive thermoplastic resin having a relatively low heat resistance as the material of the insulating creepage distance ensuring insulator 6. .

  As described above, the printed circuit board mounting terminal block according to the present invention is useful in that the function of detecting abnormal heat generation of the terminal fitting can be realized at low cost.

  1 terminal fitting, 1a terminal fixing screw, 1b wire connection part, 1c leg part, 1d girder part, 2 soldering part copper foil pattern, 2a solder connection part, 3 temperature sensing element mounting copper foil pattern, 4 temperature sensing element 5 Connector, 6 Insulator for ensuring insulation creepage distance, 6a Top plate part, 6b Partition wall, 7 Claw part for temporarily fixing terminal fitting, 8 Insulator cut surface for ensuring insulation creepage distance, 9 Printed circuit board.

Claims (4)

A terminal fitting comprising a girder having a plurality of electric wire connecting parts to which electric wires are attached, and a leg that supports the girder,
A printed circuit board having a first conductor pattern to which the legs are soldered,
A printed circuit board mounting terminal block for electrically connecting the electric wires attached to the electric wire connection portion of the terminal fitting mounted on the printed circuit board,
A second conductor pattern disposed on the printed circuit board while ensuring an insulation creepage distance with the first conductor pattern;
A temperature sensing element soldered to the second conductor pattern and mounted on the printed circuit board;
A connector mounted on the printed circuit board for outputting the measurement result of the temperature sensing element to the outside;
A temperature change caused by heat transmitted to the temperature detection element through the leg portion, the first conductor pattern, the printed circuit board, and the second conductor pattern caused by poor contact at the wire connection portion is detected. A printed circuit board mounting terminal block, wherein the element is detected.   The printed circuit board mounting terminal block according to claim 1, wherein the first conductor pattern is separated from other conductor patterns of the printed circuit board.   3. The printed circuit board mounting according to claim 1, wherein the first conductor pattern is enlarged to a side that does not overlap the girder, and the second conductor pattern is arranged behind the enlarged portion. Terminal block. An insulating creepage distance ensuring insulator for securing an insulating creepage distance between the plurality of terminal fittings soldered and mounted on the printed circuit board;
The insulating creepage distance securing insulator includes a top surface portion through which the leg portion is placed and the wire connection portion is placed, and a terminal metal fitting temporary fixing nail that holds the terminal metal between the top surface portion. 4. The printed circuit board mounting terminal block according to claim 1, wherein the printed circuit board mounting terminal block has a portion.

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