JPH0343658Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of the Invention] This invention relates to a terminal block for electrical equipment that is fixed to a printed circuit board and to which electrical equipment such as a contact relay or a fixed relay is removably attached.

[Prior art and its problems] Conventionally, this type of terminal block was fixed to the printed circuit board with screws, etc., which made the fixing work troublesome and the electrical connection work between the terminal block and the printed circuit board. It had drawbacks such as being troublesome.

[Purpose of the invention] This invention was made to eliminate the above-mentioned drawbacks, and the purpose is to provide a terminal block for electrical equipment that facilitates the work of fixing the terminal block and the printed circuit board and the work of electrically connecting them. shall be.

[Structure and Effects of the Invention] The terminal block for electrical equipment according to this invention includes a locking protrusion protruding from the terminal base that is removably locked in the through hole of the printed circuit board, and a locking protrusion that is formed on the printed circuit board. The present invention is characterized in that a terminal pin is provided which is press-fitted into the terminal hole for power supply.

By locking the locking protrusion into the through hole of the printed circuit board and press-fitting the terminal pin into the terminal hole of the printed circuit board, the work of fixing the terminal base and the printed circuit board and the electrical connection thereof can be completed. This can be accomplished with one touch, making the fixing and connection work extremely easy.

[Description of Embodiments] Hereinafter, embodiments of this invention will be described with reference to the drawings. Figure 1 is a perspective view showing an example of a terminal block for electrical equipment according to this invention, and Figure 2 is A-A in Figure 1.
It is a sectional view along a line.

In the figure, reference numeral 1 denotes a terminal base having external connection terminals 2 and a built-in printed circuit board 4. The connection terminals 2 include, for example, a terminal piece 2a and a screw body 2b.
It is set between a plurality of electrically insulating barriers 1a, and is electrically connected by brazing the lead piece 2c of the terminal piece 2a to the wiring of the printed circuit board 3.

A locking protrusion 1b is protruded from the lower surface of the terminal base 1 and is removably locked in a through hole 21a of a printed circuit board 21 which is formed separately from the terminal base 1.

3 is a socket fixed to the terminal base 1,
Here, for example, three sockets 3a, 3b, and 3c of different types are set, and each socket 3 has a plurality of terminal holes 7 into which external terminals 6 of electrical equipment such as a relay 5 are inserted, and a plurality of terminal holes 7 into which the external terminals 6 are inserted. It has a socket terminal 8 which is detachably attached and electrically connected, and this socket terminal 8 is electrically connected by brazing its lead piece 8a to the wiring on the printed circuit board 4. .

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

Reference numeral 10 denotes a connector, and this connector 10 is constructed by implanting terminal pins 10a, such as banana jacks, in the printed circuit board 4, and brazing the intermediate portions of the terminal pins 10a to the wiring of the printed circuit board 4. connected.

The printed circuit board 21 has the terminal pins 10
A is press-fitted to form a current-carrying terminal hole 21b that is electrically connected to the wiring of this board 21.

A diode 11 for absorbing back electromotive force is connected to the printed circuit board 4 or 21, 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 via the socket terminal 8 and a voltage selection resistor whose resistance value is selectively set depending on the working voltage.
A series body formed by connecting the resistor R for current limiting in series with the light emitting diode 9 for operation display is connected to the resistor Rs for voltage selection.
It is configured by connecting in parallel.

Further, the 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 element R1 inserted between the base and the collector. A diode D2 is inserted between the emitter base, and an input signal is applied to the drive circuit 13 between a pair of input terminals P and Q via a protection diode D1.

Furthermore, the drive circuit 13 in FIG.
Connect the series body of VR and time limit capacitor C1,
At the connection point a between the resistor VR and the time capacitor C1, there is a programmable unification
An anode A of a transistor TR (hereinafter referred to as PUT) 14 is connected.

The gate G of the above PUT14 is connected to the voltage dividing resistor R3,
It is connected to voltage dividing point b of R4, and the potential at point b is determined by the voltage dividing of these resistors. Furthermore, the cathode K is connected to the input terminal Q via the resistor R2, and a relay 5 is connected between the input terminals P and Q.
A parallel circuit of a diode 20 for absorbing back electromotive force and a series body of a resistor R5 are connected. Also,
Connection point c between relay 5 and resistor R5, and resistor R
A diode D4 in the forward direction with respect to the connection point b is connected between the connection point b between the resistor R3 and the resistor R4.

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

In FIGS. 1 and 2, printed circuit board 2
By locking the locking protrusion 1b in the through hole 21a of the printed circuit board 1 and press-fitting the terminal pin 10a into the terminal hole 21b of the printed circuit board 21, the work of fixing the terminal base 1 and the printed circuit board 21 and its Electrical connections can be made with just one touch.

This makes it extremely easy to fix the terminal base 1 and connect control signal lines. Further, the external connection terminal 2 is connected to a power supply and a load circuit.
Furthermore, the external terminal 6 of the relay 5 is inserted into the terminal hole 7 of the socket 3 fixed to the terminal base 1, 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 protruded from both ends of the guide piece 15, and as shown in FIG. It is recommended to set a holding piece 12 on the terminal base 1 for holding the terminal base 1.

After completing the wiring as described above, as shown in FIG. 4, when a power supply voltage is applied between a pair of input terminals P and Q, the relay 5 is energized.
The operating state is visually recognized by the light emitting diode 9. Further, according to this drive circuit 13, when the relay 5 is disconnected, the light emitting diode 9 is not energized, so it is possible to prevent erroneous display, and at the moment when the relay 5 is disconnected, the light emitting diode 9 is not energized. This has the advantage that the generated back electromotive force can be absorbed by the resistor Rs, thereby preventing the light emitting diode 9 from being destroyed.

Next, in FIG. 5, a pair of input terminals P,
When an input signal is applied across Q, relay 5 is energized, and the input signal continues to be energized until capacitor C is fully charged.

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 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 and turning on the transistor TR. The charging current is instantaneously discharged into the transistor TR and the relay 5, causing the relay 5 to return to its normal state.

Furthermore, in Fig. 6, when an input signal is applied between a pair of input terminals P and Q, a charging current flows through the variable resistor VR to the time-limiting capacitor C1, and the potential at point a changes sequentially. when it reaches the breakover voltage of PUT14 determined by point b. This PUT 14 shows a sudden negative resistance and turns on, generating a negative trigger pulse at the connection point b. This trigger pulse is connected to the diode D4
The relay 5 is driven by being applied to the relay 5 via the above.

Incidentally, since the output from the PUT 14 is a trigger pulse, when this output pulse disappears, the relay returns to its original state, so a holding current is passed through the relay through the resistor R5 to maintain its operating state.

The resistor R5 has the function of passing the holding current of the relay and at the same time dividing the voltage so that the connection point c is lower than the connection point b4 before the relay operates, so that the voltage between the connection points is The potential relationship is maintained by the function of 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 locking the locking protrusion 1b in the through hole 21a of the printed circuit board 21 and press-fitting the terminal pin 10a into the terminal hole 21b of the printed circuit board 21, the terminal base 1 and the printed circuit board 1 are connected. The work of fixing to the board 21 and the work of electrically connecting it can be accomplished with one touch, making the work of fixing and connecting the board 21 extremely easy.

In the above embodiment, when a plurality of sockets 3 are mounted on the terminal base 1 as in the embodiment,
Even if the model of the relay 5 set in the socket is changed, only the socket 3 needs to be changed and installed without changing the terminal base 1, so the number of parts is reduced and it is extremely economical. It will be cheaper. However, the socket 3 may also be formed integrally with the terminal base 1.

In addition, when the light emitting diode 9 for operation display, the diode 11 for absorbing back electromotive force, and the relay drive circuit 13 are incorporated into the printed circuit board 4 of the terminal base 1, the terminal base 1, the configuration is simpler and the number of parts can be reduced. However, without the printed circuit board 4, the socket terminal 8 and connector 10
The terminal pin 10a and the external connection terminal 2 may be connected by a lead wire.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a terminal block for electrical equipment according to this invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a perspective view showing an example of a terminal block for electrical equipment according to this invention. The partially deformed partially cutaway side view shown when the relay is mounted, and FIGS. 4 to 6 are different circuit diagrams of the relay drive circuit. 1... Terminal base, 1b... Locking protrusion, 2... External connection terminal, 3... Socket, 5... Electrical equipment,
6... External terminal of electrical equipment, 8... Socket terminal, 10... Connector, 10a... Terminal pin, 1
DESCRIPTION OF SYMBOLS 1... Diode for absorbing back electromotive force, 13... Drive circuit, 19... Light emitting diode, 21... Printed circuit board, 21a... Through hole, 21b... Terminal hole.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A terminal base having an external connection terminal and a socket terminal to which an external terminal of an electrical device is removably attached and electrically connected, and this terminal base. a locking protrusion that protrudes from and is removably locked in the through hole of the printed circuit board, and a current-carrying terminal electrically connected to the external connection terminal and the socket terminal and formed on the printed circuit board. A terminal block for electrical equipment, comprising a terminal pin that is press-fitted into the hole, and the terminal pin and the terminal hole are electrically connected in a detachable manner. (2) A terminal block for electrical equipment according to claim 1, which is a utility model registration claim, in which a plurality of sockets to which external terminals of electrical equipment are removably attached and electrically connected are fixed to the terminal base. . (3) Utility model registration claims in which one or more types of light-emitting diodes for operation display, diodes for absorbing back electromotive force, and relay driving circuits are incorporated into a printed circuit board (paragraph 1 or 2) Terminal block for electrical equipment as described.