JPS62249371A - Terminal block for electric equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a terminal block for electrical equipment, such as a contact relay or a solid state relay, to which external terminals of electrical equipment, such as contact relays and solid state relays, are detachably attached and electrically connected. .

[Prior art and its problems] Conventionally, this type of terminal block has been used as an intermediate joint for receiving output from another circuit as an input and outputting it to another circuit, or as a terminal block for a relay, for example. It is used as a dedicated terminal block for installing multiple relays.

In that case, if a light emitting diode for operation display, a diode for absorbing back electromotive force, and a relay driving circuit were required, it was necessary to prepare a dedicated terminal block for each and install a separate printed circuit board. . As a result, the number of models increases, and the number of parts increases, resulting in an extremely uneconomical and expensive product.

[Object of the Invention] This invention has been made in order to eliminate the above-mentioned drawbacks, and the object thereof is to provide a terminal block for electrical equipment that has a small number of parts, is extremely economical, and is inexpensive.

[Configuration and Effects of the Invention] The terminal block for electrical equipment according to the present invention includes a main terminal block having an external connection terminal and a built-in printed circuit board;
A plurality of sockets are fixed to the main terminal block and external terminals of electrical equipment are removably attached to the electrically connected sockets, and the main terminal block and the sockets are electrically connected via the printed circuit board. It is characterized by being connected.

In this way, if the type of electrical equipment set in the socket is changed by attaching multiple sockets to the main terminal block, you can install it by changing only the socket without changing the main terminal block. Since it is good, the number of parts is small, making it extremely economical and inexpensive.

In addition, the light emitting diode for operation display, the diode for absorbing back electromotive force, and the relay drive circuit can be incorporated into the printed circuit board of the main terminal block, so a main terminal block is available for many models. compared to when
The configuration is simple and the number of parts can be reduced.

[Explanation of Examples] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of a terminal block for electrical equipment according to the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1.

In the figure, l is a main terminal block that has external connection terminals 2 and has a printed circuit board 4 built inside.

The connection terminal 2 is composed of, for example, a terminal piece 2a and a screw body 2b, and is set between a plurality of electrically insulating barriers la, and connects the lead piece 2c of the terminal piece 2a to the wiring of the printed circuit board 3. By attaching it, it is electrically connected.

Reference numeral 3 denotes a socket fixed to the main terminal block 1, and here, for example, three sockets 3a and 3b of different types are connected.
, 3c are set, and each socket 3 has a plurality of terminal holes 7 into which external terminals 6 of an electrical device, for example a relay 5, are inserted;
The external terminal 6 has a socket terminal 8 to which the external terminal 6 is removably attached and electrically connected. It is connected to the.

9 is a light emitting diode for displaying operation; this diode 9
is electrically connected by brazing its lead wire 9a to the wiring of the printed circuit board 4.

10 is a connector, and this connector 1o consists of, for example, a terminal piece 10a and a screw body fob, and an electrical insulating stand 10c.
By brazing the lead piece 10c of the terminal piece 1°a to the wiring of the printed circuit board 4,
electrically connected.

A diode 11 for absorbing back electromotive force is connected to the printed A-board 4, and a driving circuit 13 for the relay 5 as shown in FIGS. 4 to 6 is incorporated therein.

That is, the drive circuit 13 in FIG. 4 connects the relay 5 in series via the socket terminal 8 and a voltage selection resistor Rs whose resistance value is selectively set depending on the working voltage, and also emits light for operation indication. A series body formed by connecting a current limiting resistor R to a diode 9 in series is connected in parallel to the voltage selecting resistor Rs.

Further, the drive circuit 13 in FIG. 5 includes a transistor T
R, a capacitor C and a relay 5 connected in series between the collector and emitter of the transistor TR, a high resistance element R1 inserted between the base and the collector, and a diode D2 inserted between the emitter and the base. , an input signal is applied to this drive circuit 13 between a pair of input terminals P and Q via a protection diode D1.

Furthermore, the drive circuit 13 in FIG. 6 has input terminals P,
A series body of a variable resistor VR and a time-limiting capacitor C1, which constitute a time-limiting circuit, is connected between Q and a programmable unijunction transistor (hereinafter referred to as PUT It is called
) 14 anodes A are connected.

The gate G of the PUT 14 is connected to the voltage dividing point of the voltage dividing resistors R3 and R4, and the potential at point b is determined by the voltage division of these resistors. Furthermore, the cathode has a resistor R2.
A relay 5 and a diode 1 for absorbing back electromotive force are connected between the input terminals P and Q.
A parallel circuit with R1 and a series body with resistor R5 are connected.

Also, the connection point C between the relay 5 and the resistor R5, and the resistor R
A diode D4 in the forward direction with respect to the connection point S is connected between the connection point S of the resistor R4 and the connection point S of the resistor R4.Next, the operation of the above configuration will be explained.

In FIGS. 1 and 2, the external connection terminal 2 is connected to a power source and a load circuit, and a control signal line is connected to the terminal piece 10a of the connector 10 and the screw body 10b. Further, the external terminal 6 of the relay 5 is inserted into the terminal hole 7 of the socket 3 fixed to the main terminal block l, and the external terminal 6 is electrically connected to the socket terminal 8.

At this time, in order to easily attach the relay 5 to the socket 3, a guide piece 15 with a tapered tip is provided at both ends of the guide piece 15, and as shown in FIG. It is recommended that a holding piece 12 for holding the surface corner portion be provided on the main terminal block l.

After completing the wiring as described above, when power supply voltage is applied between the pair of input terminals P and Q in FIG. 4, the relay 5 is energized and the light emitting diode 9 indicates its operating state is visible. Moreover, this drive circuit 13
Accordingly, when the relay 5 is disconnected, the light emitting diode 9 is no longer energized, so that false display can be prevented, and the back electromotive force generated in the light emitting diode 9 at the moment the relay 5 is disconnected can be reduced. Absorbed by resistor Rs,
This has the advantage that destruction of the light emitting diode 9 can be prevented.

Next, in FIG. 5, a pair of input terminals P.

When an input signal is applied between 9, relay 5 is energized,
The input signal continues to be energized until the capacitor C is completely charged.

At this time, the base and emitter of the transistor TR are short-circuited by the diode D4, and the transistor remains off.

When the input signal is cut off, the charging current of the capacitor C flows in the opposite direction to the diode D4 through the resistor R1, increasing the potential between the base and emitter of the transistor TR,
As a result of turning on the transistor TR, the charging current of the capacitor C is instantly discharged into the transistor TR and the relay 5, causing the relay 5 to return to its original state.

Furthermore, in FIG. 6, now a pair of input terminals P, Q
When an input signal is applied between them, a charging current flows through the variable resistor VR to the time-limiting capacitor C1, and the potential at point a increases sequentially, causing the break-all (voltage) of PUT14 determined by point b. When reached, this PUT l 4
shows a sudden negative resistance and turns on, generating a negative trigger signal at the connection point. This trigger pulse is applied to the relay 5 via the diode D5, so that
The relay 5 is driven.

By the way, since the output from PUT l4 is a trigger pulse, when this output pulse disappears, the relay returns to normal, so a holding current is passed through the relay through resistor R5 to maintain its operating state. .

The resistor R5 has the ability to flow the holding current of the relay and at the same time divide the voltage so that the connection point C is lower than the connection point I before the relay operates.
The potential relationship between the connection points is maintained by the diode D4. Therefore, the relay circuit section and the time limit circuit section do not influence each other.

As is clear from the above, by attaching a plurality of sockets 3 to the main terminal block 1, even if the AK power of the electrical device 5 set in the socket 3 is changed, the main terminal block 1 can be changed without changing. Since only the socket 3 needs to be changed and assembled, the number of parts is reduced accordingly, making it extremely economical and inexpensive.

In addition, a light emitting diode 9 for operation display, a diode ll for absorbing back electromotive force, and a relay driving circuit 13 are provided.
can be incorporated into the printed circuit board 4 of the main terminal block 1, so the configuration is simpler and the number of parts can be reduced compared to the case where main terminal blocks are prepared for each of many models.

In addition, in the above embodiment, the connector 10 has the terminal piece 1
0a and a screw body 10b, this may be another terminal such as a wrapping terminal or a tab terminal.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a terminal block for electrical equipment according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is a partially deformed, partially cutaway side view showing an electrical device attached to the electrical device terminal block, and FIGS. 4 to 6 are different circuit diagrams of the relay drive circuit. 1... Main terminal block, 2... External connection terminal, 3...
- Socket, 4... Printed circuit board, 5... Electrical equipment, 6... External terminal of electrical equipment, 8... Socket terminal, 9... Light emitting diode, 10... Connector, 11
... Diode for absorbing back electromotive force, 13... Drive circuit. Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) A main terminal block with external connection terminals and a built-in printed circuit board, and multiple sockets that are fixed to this main terminal block and are electrically connected to external terminals of electrical equipment that are removably attached to them. A terminal block for electrical equipment, characterized in that the external connection terminal of the main terminal block and the socket terminal of the socket are electrically connected via a printed circuit board. (2) An electrical device according to claim 1, which is formed by incorporating one or more of a light emitting diode for operation display, a diode for absorbing back electromotive force, and a circuit for driving the electrical device into a printed circuit board. Terminal block. (3) The terminal block for electrical equipment according to claim 1 or 2, wherein a connector is attached to the main terminal block and electrically connected to the printed circuit board.