JPS58142625A - Solid-state relay for driving solenoid valve - Google Patents

Abstract

PURPOSE:To prevent an electric power source from introducing noise into a low voltage controlling circuit, by connecting the low voltage controlling circuit and a zero crossing circuit by a photocoupler through an optical fiber. CONSTITUTION:In a solid state relay for controlling a valve opening and closing solenoid 11, a triode AC switch 18 is constituted so as to be opened and closed through a zero crossing circuit 14. The zero crossing circuit 14 is controlled by a low voltage controlling circuit 20, through photocouplers 15, 16 operated by low voltage. A light emitting element 16 and a photodetector 15 for constituting the photocoupler are connected by an optical fiber 17. By constituting in this way, it is possible to prevent an electric power source from introducing noise into the low voltage controlling circuit 20 from an electric power source 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention is directed to a solid state relay that controls a solenoid valve that is driven to open and close by a solenoid.

As shown in Figures 1 to 6, the conventional solid-state relay (hereinafter abbreviated as S S It), ie, SSR1, is manually operated at low voltage as shown in Figure 3. The input circuit is a light receiving element 3 such as a phototransistor that is operated by the light emitted from the light emitting element 2 of the photocoupler, and a triac 5 is switched through a zero cross circuit 4. A solenoid 7 is connected in series to a general heel 6. 5SR1 is the low voltage control circuit 7 as shown in Figure 1.
If it is placed in the vicinity of the 5SR1, then this noise will be transferred to the input side from where the 4b voltage wire 6a containing foreign noise is wired to the output side of the 5SR1. The 5SRi malfunctioned after entering the room.
Also, when 5SR1 is directly attached to the solenoid 7 and the human power line 1a of 5SR1 is extended to the low-voltage control circuit 7 using an electric wire as shown in Figure 2, the power line 1a is connected to the input line 1a or at the position of 5SR1. 6a, making it impossible to prevent malfunctions due to noise.

The present invention was made in order to improve the above-mentioned conventional circumstances. Embodiments of the present invention will be explained below with reference to FIGS. 4 and 5.

A solid state edge [13 is attached to the valve 12 which is opened and opened by the solenoid 11.

The zero cross circuit 14 of the solid state scissors lA11f Ia is operated by a light receiving element 16, and the light receiving element 15 and the light emitting element 16 forming a photocoupler are extended and connected by an optical fiber 17 which is not affected by electrical noise. It is.

The output side is connected to a triac 18 by a zero-risk circuit 14.
is triggered to open and close solenoid 11 connected in series to 4619.

Low voltage 11i (1sll'i1 circuit 20'
＼ is an optical fiber (HitC optical connection is made, so there is also a 19M line)
Noise (J) is not a big deal.Also, the power line 11
1b is connected directly to the solenoid 11, and since it is good to wire it only to the solid state device, there is no problem with incorrect wiring pJ.
The capacity will also decrease, and since you don't have to hire someone, you can immediately deliver the 11d installation. This is advantageous in terms of the need for thick copper wires to suppress voltage drop in AC type solenoids, which are often prone to blood flow during start-up, and the tolerance of the voltage cap.

As explained above, according to the solid state relay for a solenoid valve of the present invention, the photocoupler light receiving element l is connected to the valve device 12 which is driven to open and open by the solenoid 111.
A solid-state device [13
In a solid state relay for a solenoid valve, which is formed by attaching a solenoid 11 and a triac 18 in series to a '4111 itu+, an optical fiber 17 installed opposite to the light receiving element 15 of the photocoupler is extended to control the other end at a low voltage. The light-emitting element 10 of the photocoupler operated by the circuit 20 is connected to the photocoupler light emitting element 10. Well,
The problem with the low voltage control circuit 20 due to noise is that the element element 5 is placed on the noise side, the light emitting element 16 is placed on the low voltage control circuit side, and the original fiber 17 is used to avoid errors caused by the noise. There are effects such as not having to create IvI, and rationalizing the layout and wiring.

[Brief explanation of the drawing]

1 to 3 show conventional examples, and FIG. 1 is a circuit diagram,
FIG. 2 is a circuit diagram of another conventional example, and FIG. 6 is a more detailed circuit diagram of FIG. 1.2. 4 and 5 show embodiments of the present invention, with FIG. 4 being a detailed circuit diagram and FIG. 5 being a circuit diagram. 11... Solenoid, 12... Valve device, 13.
°°Solid date device, 14... Zero cross circuit, 15... Light receiving element, lli... Light emitting element, 57.
...Optical fiber, 18...Triac, 19...
Power supply, 2θ...low voltage control circuit. Patent applicant Matsushita Kameko Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Claims] 1) Attach a solid-state device including a triac triggered by a zero-cross circuit equipped with only a photocoupler light-receiving element to a valve device that is driven to open and close by a solenoid.
A solid-state relay for a solenoid valve connected in series with am is connected to the light receiving element of the photocoupler, and an optical fiber opposite to the light-receiving element of the photocoupler is extended, and the bent end is controlled by a low range pressure control circuit to emit light from the photocoupler by M'Nq. A solid state relay for solenoid valves, which is characterized by being installed opposite to the element.