JP2532060B2 - Relay unit - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a relay unit having a terminal block provided with a socket for detachably mounting a plurality of contact relays and solid state relays.

[Conventional technology and its problems]

Conventionally, as a relay unit of this type, if a socket for detachably mounting a relay and a terminal block are separately configured, the wiring work for connecting these both with a lead wire guided to the outside is troublesome, There is known a terminal block with a socket in which these are integrally configured, and a socket terminal and an external connection terminal are internally connected by a lead piece integrated with these (see Japanese Patent Laid-Open No. 59-20980).

The output terminals of the conventional external connection terminals are arranged in a plurality of rows and fixed to the terminal block, and each row has a step-like step in the vertical direction. The adjacent ones are separated from each other by an isolation wall to increase the creepage distance and secure the withstand voltage.

According to the above configuration, a predetermined insulation distance and a special insulation structure are required for the plurality of output external connection terminals to secure the withstand voltage, and the socket terminals and the lead pieces integrated with these terminals have substantially the same insulation distance. And insulation structure is required,
An internal space for accommodating these socket terminals and lead pieces is required for the terminal block.The terminal block is used only for accommodating the lead pieces and socket terminals, and an internal space for ensuring an insulation distance is required. It becomes wider and larger.

Also, when a relay is mounted on such a large terminal block, the relay protrudes above the top surface of the terminal block formed with step-like steps, and the height of a relay unit equipped with multiple relays increases. Further increase in size.

Moreover, the drive circuit of each of the above relays is formed on a printed circuit board that is removably mounted on a terminal block with a socket, and this printed circuit board is set to extend to the side of the terminal block. The size of the relay unit equipped with will increase in size and will increase in size.

This means that if a printed circuit board is housed in the internal space of the terminal block with a socket having the above-mentioned structure and a relay is incorporated in order to secure an insulation distance between each lead piece and the socket terminal, for example The internal space as disclosed in Japanese Patent No. 78592 further expands and becomes larger.

As described above, for example, as disclosed in JP-A-50-116989, even if the socket is formed separately from the terminal block and the socket is fitted to the terminal block,
There are almost the same issues.

[Object of the Invention]

The present invention has been made to solve the above problems, small and compact, easy manufacturing and assembly work,
An object is to provide an economical and inexpensive relay unit.

[Constitution and effect of the invention]

The relay unit according to the present invention includes an input connector, a plurality of relay sockets arranged in a single column,
The main terminal block is configured as a separate body and mounted on the main surface of the printed circuit board in close proximity to each other, and a plurality of output external connection terminals are arranged in a plurality of rows on the main terminal block to form a stepwise pattern in the vertical direction. Fixing with a step and projecting an isolation wall between the output external connection terminals adjacent to each other in each row, the input external connection terminal, the socket terminal and the input external connection terminal, socket terminal and The external connection terminals for output are directly brazed to the printed circuit board and connected to a plurality of relay drive circuits and output circuits formed on the printed circuit board.

According to the above configuration, the input connector and the relay socket are configured separately from the main terminal block and mounted on the main surface of the printed circuit board, and the space between the output external connection terminal and the socket terminal is printed. Since the structure is connected by the wiring of the board, the lead piece for connecting the output external connection terminal and the corresponding socket terminal is unnecessary, and the internal space of the terminal block for housing the lead piece is It can be effectively used as a setting space for the socket and the relay, and accordingly, the height of each socket can be suppressed low, and the relay unit can be made small and compact.

In other words, originally, the output external connection terminals are fixed to the main terminal block by tensioning them in multiple rows in order to ensure a withstand voltage and providing a step-like step in the vertical direction for each row. In addition, each row's adjacent ones are separated by an isolation wall to form a long creepage distance, and the height of the top surface of the main terminal block is set to the minimum dimension required to secure the withstand voltage. The socket and the relay can be housed within this minimum height dimension, and the relay unit equipped with a plurality of relays can be made small and compact.

On the other hand, the coupling between the output external connection terminals of each row arranged with a step-like step and the corresponding socket terminal is achieved by the wiring of the printed circuit board, and the input external connection terminal and the socket are connected. Since the terminal and the external connection terminal for output are directly brazed to the printed circuit board,
Manufacturing and assembling work is easy, and it is economical and inexpensive.

[Explanation of Example]

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an example of a relay unit according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.

In the figure, 1 is a main terminal block, and the output external connection terminals 2 are arranged in a plurality of rows, for example, two upper and lower rows in order to ensure a withstand voltage.
It is fixed by arranging in steps and in two rows with step-like steps,
In addition, an isolation wall 1a is formed which isolates mutually adjacent members of each row from each other.

The connection terminal 2 is composed of, for example, a terminal piece 2a and a screw body 2b, and the lead piece 2c of each terminal piece 2a is directly brazed to the wiring of an output circuit (not shown) formed on the printed circuit board 4. It is electrically connected.

3 is a plurality of sockets, in which, for example, three sockets 3a, 3b, 3c of different types are set, and the terminal block 1
It is configured separately from. Each socket 3 (3a, 3b,
3c) has a plurality of terminal holes 7 into which the external terminals 6 of the relays 5 are inserted, and socket terminals 8 to which the external terminals 6 are detachably mounted and electrically connected. The lead terminal 8a of the socket terminal 8 is connected to the printed circuit board 4 described above.
It is electrically connected by brazing directly to the wiring.

Reference numeral 9 is a light emitting diode for operation display, and each of the above relays 5
Corresponding to the above, it is set on the top surface 1A of the uppermost step having a step-like step in the terminal block 1, and each lead wire 9a
Are electrically connected to the wiring of the printed circuit board 4 by directly brazing.

Reference numeral 10 is an input connector, which is provided with a plurality of input external connection terminals 10A composed of a plurality of terminal pieces 10a corresponding to the relays 5 and a screw body 10b, and is housed in an electric insulation base 10c to provide the terminal pieces. Connect the lead piece 10d of 10a to the printed circuit board 4 described above.
It is electrically connected by directly brazing to the wiring of the relay drive circuit 13 which will be described later and is formed.

That is, the printed circuit board 4 is shown in FIGS.
A drive circuit 13 for the relay 5 as shown is incorporated.

The relay drive circuit 13 in FIG.
The relay 5 and the resistor Rs for voltage selection whose resistance value is selectively set according to the working voltage are connected in series, and the resistor R for current limiting is connected in series to the light emitting diode 9 for operation display. An input signal is applied between the pair of input terminals P and Q by connecting a series body composed of the above in parallel to the voltage selection resistor Rs. Each of these input terminals P, Q
Corresponds to the input external connection terminal 10A.

The relay drive circuit 13 in FIG. 5 includes a transistor TR, a capacitor C and a relay 5 connected in series between the collector and emitter of the transistor TR, and a high resistance body R1 interposed between the base and collector. , Emitter
The relay drive circuit 13 is provided with a diode D2 interposed between the bases, and an input signal is applied between the pair of input terminals P and Q via the protection diode D1.

Further, in the relay drive circuit 13 in FIG. 6, a series body of a variable resistor VR and a time-limit capacitor C1 forming a time-limit circuit is connected between the input terminals P and Q, and the resistor VR and the time-limit capacitor C1 are connected. A programmable unijunction transistor (hereinafter referred to as PUT) 14 is provided at the connection point a.
The anode A of is connected.

The gate G of the PUT 14 is connected to the voltage dividing point b of the voltage dividing resistors R3 and R4, and the potential of the point b is determined by the voltage dividing of these resistors. Further, the cathode K is connected to the input terminal Q via the resistor R2, and between the input terminals P and Q, the parallel circuit of the relay 5 and the counter electromotive force absorbing diode 11 and the resistor R5 are provided. The series body is connected. Further, between the connection point c between the relay 5 and the resistor R5 and the connection point b between the resistor R3 and the resistor R4, a diode in the forward direction with respect to the connection point b is provided.
D4 is connected.

 Next, the operation of the above configuration will be described.

In FIG. 1 and FIG. 2, the external terminal 6 of each relay 5 is inserted into the corresponding terminal hole 7 of the socket 3, and the external terminal 6 of each relay 5 is electrically connected to the socket terminal 8.

At this time, guide pieces 15 having tapered both ends are provided so that the relay 5 can be easily attached to the socket 3, and the upper corner portion of the attached relay 5 is held as shown in FIG. It is recommended to set the holding piece 12 for the above in the socket 3.

Further, the output external connection terminals 2 corresponding to the relays 5 are connected to a power supply and a load circuit (not shown), and the input external connection terminals 10A are connected to a control input signal line (not shown). To do.

By the way, in this embodiment, since three sockets 3 and three relays 5 are set, each relay drive circuit 13
As a result, three predetermined circuits among the circuits shown in FIGS. 4 to 6 are formed on the printed circuit board 4.

The input terminals P and Q of the three relay drive circuits 13 formed on the printed circuit board 4 are four external connection terminals 10A for input.
Respectively connected to. That is, of the input terminals P and Q, one input terminal P is three independent external connection terminals for input 10A, and the other input terminal Q is the remaining one external connection terminal for input 10A in common. It is used as a terminal.

An output circuit opened / closed by each relay contact (not shown) of the three relays 5 in each relay drive circuit 13 is formed on the printed circuit board 4, and an output terminal of this output circuit is an external connection for each output. Connected to terminals 2 respectively.

In other words, 3 out of 4 pairs of the output external connection terminals 2
The paired terminals are used as the output terminals of the above output circuits, and the remaining 1
The pair of output external connection terminals 2 are not used in this embodiment.

Now, in FIG. 4, when an input signal is applied to the pair of input terminals P and Q, the relay 5 is excited and the operating state is visually recognized by the light emitting diode 9. Further, according to the relay drive circuit 13, when the relay 5 is broken, the light emitting diode 9 is not energized, so that it is possible to prevent erroneous display and also to prevent the light emitting diode 9 from breaking at the moment of breaking the relay 5. The counter electromotive force generated in the resistor Rs
It is possible to prevent the destruction of the light emitting diode 9 by absorbing the light.

Further, in FIG. 5, when an input signal voltage is applied between the pair of input terminals P and Q, the relay 5 is excited and the input signal is energized until the charging of the capacitor C is completed. At this time, the base and emitter of the transistor TR are short-circuited by the diode D2, and the transistor TR remains off.

When the input signal voltage is cut off, the charging current of the capacitor C flows through the resistor R1 to the diode D2 in the opposite direction, increasing the potential between the base and the emitter of the transistor TR and turning on the transistor TR. The charging current of the capacitor C is instantly discharged to the transistor TR and the relay 5,
The relay 5 is restored.

Further, in FIG. 6, when an input signal voltage is applied between the pair of input terminals P and Q, a charging current flows through the variable resistor VR to the time-limit capacitor C1 and the potential at point a rises sequentially. However, when the breakover voltage of the PUT 14 determined by the point b is reached, the PUT 14 exhibits a sharp negative resistance and turns on, generating a negative trigger pulse at the connection point b. This trigger pulse is relayed via diode D4 to relay 5
Is applied to drive the relay 5.

By the way, since the output from the PUT 14 is a trigger pulse, when the output pulse disappears, the relay returns. Therefore, a holding current is passed through the resistor via the resistor R5 to hold the operating state. The resistor R5 has a function of flowing the holding current of the relay and at the same time dividing the voltage so that the connection point c becomes lower than the connection point b before the operation of the relay. The potential relationship is held by the function of the diode D4. Therefore, with the relay circuit part,
There is no influence on the timed circuit section.

As is apparent from the above, the plurality of output external connection terminals 2 are arranged in two rows and fixed to the terminal block 1, and each row has a step-like step in the vertical direction, and Adjacent ones in each row are separated by the isolation wall 1a, the creepage distance is long, and the withstand voltage is secured.

According to the above configuration, the main terminal block 1 and the socket 3 are separately configured, and the terminals of the output external connection terminal 2 and the socket terminal 8 are connected by the wiring of the printed circuit board 4. , A lead piece for connecting the output external connection terminal 8 and the corresponding socket terminal 8 becomes unnecessary, and the internal space of the terminal block 1 for housing the lead piece is set by the socket 3 and the relay 5. It can be effectively used as a space, and accordingly, the height of each socket 3 can be suppressed to a low level so that, for example, the upper surface 5A of the relay 5 mounted on each socket 3 can be the top surface 1A of the terminal block 1. It is possible to achieve the miniaturization and the compactness of the relay unit by arranging the relay unit at a level lower than the above level.

That is, originally, the output external connection terminals 2 are arranged in a plurality of rows in order to ensure a withstand voltage, and each row has a step-like step in the up-down direction so that the main terminal block 1 is provided. Walls that are fixed and adjacent to each other in each row
The height of the top surface 1A of the terminal block 1 is set to the minimum dimension required to secure the withstand voltage by separating it with 1A to form a long creepage distance. Within the minimum height dimension, the socket 3 and the relay 5 can be housed, and the relay unit equipped with the plurality of relays 5 is small and compact.

On the other hand, since the connection between the output external connection terminals 2 in each column arranged with a step-like step and the corresponding socket terminal 8 is achieved by the wiring of the printed circuit board 4, the input external connection is made. Since the terminal 10A, the socket terminal 8 and the output external connection terminal 2 are directly brazed to the printed circuit board 4, the manufacturing and assembling work is easy, and the cost is low.

In the above embodiment, for example, each of the three sockets 3, the relay 5, and the relay drive circuit 13 set on the printed circuit board 4 have the same structure, and the three sets of AC motors arranged outside are connected to the output external connection terminals. 2 and connect the external control circuit to the input external connection terminal 10A,
ON / OFF by opening / closing each phase of the motor with each relay 3
・ OFF control is possible.

Further, in the case of adding load circuits such as controlling a plurality of three-phase AC motors, each socket 3, relay 5, and relay drive circuit 13 may be added in correspondence with the number of these load circuits. There is no end.

Furthermore, in the above embodiment, the case where a three-phase AC motor is connected to the output external connection terminal 2 as the load circuit has been described, but one or more other controlled circuits may be connected as the load circuit. Needless to say.

[Brief description of drawings]

1 is a perspective view showing an example of a relay unit according to the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a partial cutaway view of another example of the relay unit according to the present invention. 4 and 6 are different circuit diagrams of the relay drive circuit. 1 ... Main terminal block, 1a ... Separation wall, 2 ... Output external connection terminal, 3 ... Socket, 4 ... Printed circuit board, 5 ...
… Relay, 8 …… Socket terminal, 10 …… Input connector, 10A …… External input connection terminal, 13 …… Relay drive circuit.

Claims (1)

(57) [Claims] 1. An input connector, a plurality of relay sockets arranged in a single column, and a main terminal block are separately configured and mounted on a main surface of a printed circuit board in close proximity to each other. A plurality of output external connection terminals are arranged on the main terminal block in a plurality of rows and fixed with a step-like step in the vertical direction, and an isolation wall for the output external connection terminals adjacent to each other in each row is provided to project. Connector, relay socket, and external terminal for input respectively set on the socket and main terminal block, socket terminal and external terminal for output are directly brazed to the wiring of the printed circuit board, and a plurality of printed circuit boards are formed on the printed circuit board. A relay unit characterized by being connected to a relay drive circuit and an output circuit.