JPH01146220A - Photocoupler built-in relay - Google Patents

Abstract

PURPOSE:To simplify the circuit composition parts, to realize a high density mounting of a printed substrate, and to improve the noise margin, by installing a circuit block including a relay and a photocoupler in a single package. CONSTITUTION:To a primary side driving source terminal 7 and to a relay driving power source terminal 8, different power sources are used respectively, and a grounding for a driving element 4 and a grounding for a grounding terminal 10 are also separated. The primary side and the secondary side of the photocoupler 2 are separated by an FG (frame ground) pattern for noise removing purpose. Since the photocoupler 2 is used at the input, an LED at the primary side of the photocoupler 2 is lighted to deliver the signal to the secondary side when the output of the driving element 4 is made 'L'. And when a transistor of the secondary side of the photocoupler 2 is ON, the relay coil of a relay 1 is excited to close a relay contact 16. Since a relay and a circuit block having a photocoupler are installed in one package, a compact size is realized and the mounting efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a relay incorporating a photocoupler in which a microprocessor drives the relay using a small signal from a microcomputer or the like.

(Prior Art) Fig. 4 shows a conventional circuit in which a relay is driven by a photo coupler. In the figure, (1) is a relay consisting of a relay coil (1a) and a relay contact (1b). ,
(2) is a photocoupler for driving this relay (1), (3) is a current limiting resistor, and (4) is a photocoupler (2).
) is a driving element for driving.

The conventional circuit is configured as described above, with the relay (1) and photocoupler (2) each consisting of a single component, and the electrical connection between them is through a printed circuit board on which these components are mounted. This is covered by the pattern wiring above. In this circuit, a small signal from the drive element (4) is once propagated to the relay (1) through the food coupler (2). This is to convert the signal level to drive the relay (1), and to reinforce the insulation and increase the noise margin.
For this purpose, the photocoupler (2) is essential.

[Problem that the invention seeks to solve]

In the conventional circuit as described above, pattern wiring on a printed circuit board is used to electrically connect the relay (1) and the photocoupler (2), resulting in poor mounting efficiency and This goes against the trend toward high-density packaging. In addition, since everything is composed of a single component, the number of assembly steps increases, and in order to change the level and improve the noise margin to drive the relay (1) with a small signal, a photocoupler (2) is required each time. There were problems such as having to attach them separately.

This invention was made to solve these problems, and can improve mounting efficiency and workability.
In addition, the present invention aims to provide a relay with a built-in photocoupler that can be driven by a small signal and has a large margin against external noise, as in the prior art.

[Means for solving problems]

A relay with a built-in photocoupler according to the present invention has a circuit block including a relay and a photocoupler for driving the relay housed in one package.

[Function] In the present invention, since the circuit block having the relay and the photocoupler that drives the relay is housed in one package, it is possible to reduce the size and improve the mounting efficiency. It is also possible to improve workability by eliminating connections by pattern wiring on the printed circuit board. Furthermore, since the photocoupler is built-in, it is possible to drive with a small signal, and double insulation between the relay and the photocoupler makes it possible to increase the margin against external noise.

〔Example〕

FIG. 1 shows a conceptual diagram of a relay with a built-in photocoupler according to the present invention, and in the figure, the same reference numerals as in FIG. 4 indicate the same or corresponding parts. (5) is a relay with a built-in photocoupler, (6
) is a -next side input signal terminal, (7) is a -next side drive power supply terminal, (8) is a relay drive power supply terminal, (9) is a relay contact terminal, and (10) is a ground terminal.

FIG. 2 shows a circuit configuration of a relay with a built-in photocoupler according to an embodiment of the present invention, and FIG. 3 shows an example of its specific structure. (11) is the FG (frame ground) terminal for noise removal, (12) is the flywheel diode for protecting the relay coil (1a), and (13) is the relay contact (
1b) A surge absorber for protection, (14) is an external load.

In addition, in this embodiment, as shown in FIG. ) and the ground of the ground terminal (10) are also distinguished. The negative side and the secondary side of the photocoupler (2) are isolated by a noise removing FG (frame ground) pattern.

In the relay with a built-in photocoupler configured as above, the photocoupler (2) is included in the human power section, so
When the output of the drive element (4) becomes "L", the negative side LED of the photocoupler (2) lights up, and the signal is propagated to the secondary side. Also, when the secondary side transistor of the photocoupler (2) is turned on, the relay coil (1) of the relay (2) is turned on.
a) is excited and the relay contact (1b) is closed.

In the above example, this series of processes is integrated into one component, which greatly simplifies the design method, reduces component size, and eliminates the need to prepare extra pattern wiring on the printed circuit board. There is no. In addition, the insulation has a two-stage structure consisting of the photocoupler (2) and the relay (1), so the withstand voltage and nozzle resistance level between the input and output are significantly improved compared to when only the relay (1) is used. death,
Although the number of parts is smaller than that of conventional circuits, a circuit of the same level can be obtained. Also, flywheel diode (12) and surge absorber (13)
By assembling this into the relay (5) with a built-in photocoupler, the circuit used in the actual machine can be simplified, and the FG (frame ground) terminal for noise removal can be used to connect the FG (frame ground) for noise removal. By wiring the pattern, coupling due to capacitor components between the negative side and the secondary side of the photocoupler (2) can be eliminated.

In addition, in the above embodiment, the relay (1) and the photocoupler (
2) is shown in which only one circuit block is incorporated into the package of the relay with built-in photocoupler (5), but when used as an output circuit of a controller, etc., multiple circuit blocks may be integrated into one. It may be configured as a package, and the same effects as the above embodiment can be expected.

〔Effect of the invention〕

As explained above, this invention allows a circuit block including a relay and a photocoupler to be housed in one package, thereby simplifying circuit components, increasing the density of printed circuit boards, and improving noise margins. This has the effect of making it possible to

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the circuit configuration of a relay with a built-in photocoupler according to the present invention, FIG. 2 is a circuit configuration diagram of a relay with a built-in photocoupler showing an embodiment of the invention, and FIG. FIG. 4 is a partially exploded perspective view showing an example of a conventional structure, and FIG. 4 is a diagram showing a conventional circuit configuration in which a relay is driven by a photocoupler. (1)...Relay, (2)...Photocoupler, (4)...Drive element, (5)...Relay with built-in photocoupler. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment (voluntary) 1. Indication of the incident: Patent Application No. 1983-304875 2,
Title of the invention: Relay with built-in photocoupler 3, Detailed description of the invention in the specification of the representative of the person making the amendment. 6. Contents of the amendment. This invention is
. . . The description ``a photo that is driven'' is corrected to ``the present invention is a photo that is driven by a relay using a small signal such as a microprocessor or microcomputer.''that's all

Claims (2)

[Claims] (1) A relay with a built-in photocoupler, characterized in that a circuit block having a relay and a photocoupler for driving the relay is housed in one package. (2) The relay with a built-in photocoupler according to claim 1, wherein the package contains a plurality of circuit blocks.