JP3521636B2 - Terminal relay - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as an interface between a control device such as a programmable controller and an output device such as a solenoid, and outputs an output according to an output signal of the programmable controller. The present invention relates to a terminal relay for controlling a device. 2. Description of the Related Art In recent years, there has been a strong demand for miniaturization of electric appliances such as terminal relays due to a reduction in the space of a control device. Miniaturization by mounting is required. FIG. 3 is a front view of a conventional terminal relay. A socket 16 and a screw 22 are connected to an upper housing 11 integrated with a lower housing (not shown), and a contactless relay 15 is connected to the socket 16. FIG. 4 is a circuit diagram of the contactless relay 15.
The input terminals T1 and T2 are provided outside the non-contact relay case 15a.
And the output terminals T7 and T8 are connected. Inside the non-contact relay case 15a, an input circuit and an output circuit which are insulated by a phototransistor PT are formed, and a voltage is applied to output terminals T7 and T8, and a resistor R1 of the input circuit is generated by the applied input voltage. Control the current. When a rated voltage is applied from the input terminal T2 to the input terminal T1,
The phototransistor PT is rendered conductive, the output terminal T7 side of the resistor R2 becomes substantially the same potential as the output terminal T7, and the transistor Q1 is rendered conductive. Current flows through Here, the Zener diode ZD is a component that protects the output circuit from noise. The input current of this type of contactless relay is about 10
Since a mADC is required, a non-contact relay rated at, for example, 24 VDC generates 240 mW of heat. Since such a non-contact relay is small and mounted densely as shown in FIG. 3, the temperature inside the non-contact relay rises due to this heat, and as a result, the output current of the transistor Q2 as an output element and the , The allowable ambient temperature of the terminal relay is suppressed. This suppression is because, as is well known, the output current and the temperature rating of the terminal relay are determined by the junction temperature of the output element. On the other hand, when the rating is, for example, 5 VDC, the heat generation is as low as about 50 mW. Therefore, even if the contactless relays are densely mounted, the temperature rise is slight, and there is almost no influence on the transistor Q2. In the above-described example, when the input voltage is high, a large amount of heat generated by the input current is not sufficiently dissipated, so that the output current of an output element such as a transistor and the allowable ambient temperature of a terminal relay. Was suppressed, but the effect was hardly produced when the input voltage was low. An object of the present invention is to provide a terminal relay in which the output current of an output element such as a transistor and the allowable ambient temperature of the terminal relay are not suppressed by the heat generated by the resistor due to the input current, regardless of the input voltage, and the standardization is considered. It is to be. [0007] The present invention provides a control apparatus and a control apparatus.
Used as an interface between output devices,
Terminator that controls output equipment according to the output signal of the control device
A plurality of contactless relays, a terminal block,
The plurality of contactless relays are densely mounted and
In a terminal relay comprising a printed wiring board for electrically connecting the terminal block and the contactless relay, and a housing for accommodating them, the contactless relay is mounted with an input resistor of the contactless relay. It is a structure mounted on the back of a printed wiring board. FIG. 1 is a sectional side view of a terminal relay showing an embodiment of the present invention, and FIG. 2 is an electric circuit diagram of an embodiment of the present invention. FIG. 1 differs from FIG. 4 only in the resistor R1 as shown in the circuit diagram of FIG.
The upper housing 11 forms a housing together with the lower housing 12, and houses the printed wiring board 1 on which a resistor 2 described later is mounted. Its upper housing 1
A plurality of terminals 21 are provided on both side surfaces of the
2 are screwed together to form a terminal portion, a plurality of sockets 16 are provided in the center portion, and the contactless relay shown in FIG. 2 is inserted. The resistor 2 is mounted on the back surface of the printed wiring board 1 on which the contactless relay 5 is mounted, and is isolated from the contactless relay 5. FIG. 2 differs from FIG. 4 in that the resistor R1 is connected to the outside of the input terminal T2 outside the non-contact relay case 5a to form the resistor 2, and the other points are the same as the conventional example of FIG. Therefore, the description is omitted. With this configuration, since the resistor 2 serving as a heating element is disposed separately from the non-contact relay 5, the transistor Q2 in the non-contact relay case 5a is not affected by heat, and the allowable ambient temperature is suppressed even as a terminal relay. I do not receive. When the input rated voltage is DC5V, the rated DC
5V contactless relay can be used as before,
Further, in order to share the printed wiring board 1, a conductor having a resistance value of 0Ω is connected instead of the resistor 2 of FIG. According to the present invention, when the rated input voltage of the contactless relay is high, the heating element is taken out of the case of the contactless relay to reduce the temperature rise of the output element of the transistor. It enables high-density mounting and can provide a small terminal relay. Also, the rating of the contactless relay is DC
As using a non-contact relay when 5V, by connecting the conductor resistance value 0Ω in resistance dexterity mounting portion of the printed circuit board,
There is no modification of the non-contact relay, and the terminal can be provided at a lower cost because the printed wiring board can be shared.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional side view of a terminal relay showing one embodiment of the present invention. FIG. 2 is a circuit diagram of claim 1 of the present invention. FIG. 3 is a front view of a conventional terminal relay. FIG. 4 is a circuit diagram of a conventional non-contact relay [Description of symbols] 1 printed wiring board 2 resistor 5 non-contact relay 11 upper housing 12 lower housing 15 non-contact relay 16 socket 21 terminal 22 screw Q2 transistor

Claims (1)

(57) [Claims] [Claim 1] Interface between control device and output device
Used in response to an output signal of the control device.
A terminal relay for controlling equipment , wherein a plurality of non-contact relays , a terminal block, and the plurality of non-contact relays are densely packed.
A terminal relay comprising a printed wiring board for electrically connecting the terminal block and the contactless relay, and a housing for accommodating them, wherein the input resistor of the contactless relay is connected to the contactless relay. A terminal relay mounted on the back of a printed wiring board on which a relay is mounted.