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Solid state relay, what it is and what it is intended

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Solid state relays - is an electronic device that seamlessly replaces the good old electromagnetic relays and contactors. This article will be considered by the device, the operation and scope of use of solid-state relay (hereinafter referred TTP). Let's get started.

Where applicable TTP

In fact, the area of ​​application of the relay is very wide, they can be found in automated systems industrial facilities, chemical industry, metallurgical units, medical devices and etc.

By "solid" is meant a complete absence of design any moving elements. In the product group of contacts replaces the electronic power switch. This ensures the absence of the possibility of arcing during switching.

Strengths and weaknesses

The undoubted advantages of such products is the lack of transitional processes, which greatly increases the life of the product. And if the conventional (electromagnetic) relay switching time reaches 500,000 positives, then the solid-state relays, this figure is not limited.

TTP are available in different sizes and at different voltages, which allows you to choose relays for different purposes.

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For obvious disadvantage is the high sensitivity of electronic keys to the overestimation of the current. If the current limit is exceeded Buda, the relay will break banal.

Just Disadvantages include the need to switch on the cooling radiator assembly as during operation flowing current heats the internal card, and if the excess heat not drain, the circuit from overheating out of system.

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The design of the relay

Inner filling TTF - an electronic board comprising a power switch, decoupling element and the control node.

At the same time as power elements are commonly used:

1. In DC circuits: transistors, FETs, transistors, MOSFET or the IGBT modules.

2. For switching circuits with alternating voltage applied keys triac or thyristor assembly.

The junction used optocouplers. Optocoupler - an element consisting of a light emitting element and a receiver which are separated from each other transparent dielectric material.

The control node implemented stabilizing circuit voltage and current for the light emitting element.

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In the above illustrated image displayed firm internal relay circuit 10 FOTEKSSR-DA, which is connected to terminals 3-4 input control voltage (in this case) from 3 to 32 volts postoyanke. A 1-2 is supplied to the terminal recess 24 to 380 volts.

Examples of such a connection relay following

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Options for solid state relays control

By the method of management of these relays are divided into two subgroups:

1. Control switched through zero. That is, turning on and off the relay does not occur immediately after a control signal is supplied, and only when the sinusoid voltage passes through zero. Because of this there is a delay in switching, reaching 10 ms.

2. Relay with phase control. Such a device allows to change the output voltage of the load. This allows you to precisely adjust the required power.

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A little experiment with a solid state relay

Let's do a little experiment and is connected via a solid state relay load, for example, an ordinary light bulb. So, we build a simple circuit including a power outlet and that's what we see:

The lamp is not lit up. To it has joined the conclusions we need 3 - 4 apply a DC voltage to this We connect the regulated power supply and set, for example, 7 volts and relay, closing the chain, including load. Speaking of the relay informs the red LED which is lit all the time until the relay operation. And you can buy a switch here.

conclusion

Solid State Relays - it's a great product, with its pluses and minuses. In this case, the TTP is best used in places where you need to perform a lot of switching in a short time interval. Despite the relatively high cost of solid-state relays are becoming more popular in the workplace.

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