TLP3555(F)

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Solid State Relays

Solid State Relays (SSRs) are a type of electrical switch whose operation is based on the semiconductor technology, which are generally used to control large currents. TLP3555(F) is an opto-coupler type solid state relay which is suitable for AC loads control.

TLP3555(F) Application Field

TLP3555(F) is a fast switching type SSR which is used in various applications such as controlling DC motors , controlling heating and cooling elements, lighting and many more. It is mainly used in programmable logic controllers (PLCs) and is generally connected with four cables; two for power feeding, one for signal input and the other for output.

TLP3555(F) Working Principle

The TLP3555(F) Opto-Coupler type SSR works on a simple principle. It is divided into two parts, the input part and the output part. The input part consists of an LED and an opto-coupler. The LED is connected to the input voltage which is connected to the PLC and it converts the electrical power to an optical signal. The output part incorporates a triac with a gate and a snubber circuit. The output device is triggered in two ways, either using the zero-cross technique or the phase-angle control technique. The zero-cross technique is used when the resistive load needs to be switched on and off at zero-cross frequency, while the phase-angle control technique is used when the application needs dimming effects. The output voltage’s polarity is opposite to that of the input voltage.

In the zero-cross technique, the LED in the input part will emit a light beam when the input phase reaches the zero-cross level. The optical coupler will receive the light beam and will generate a signal, which will activate the gate of the output part. Since the output part is a Triac, it will switch on and off with the zero-cross frequency. The intensity of the output voltage depends on the input voltage. The output device will switch off when the input voltage goes below the zero-cross level.

The phase-angle control technique is quite similar to the zero-cross technique, with the difference being that the switching occurs when a certain phase angle (generally ranging from 0-90 degrees) is reached instead of the zero-cross level. This technique is ideal for controlling dimming applications by controlling the power given to the load. The intensity of the output voltage depends on the input voltage and the phase angle.

Conclusion

The TLP3555(F) is a fast switching type Opto-coupler type solid state relay which is used to control various AC loads. This relay is mainly used in PLCs for various applications such as controlling motor speeds, controlling lighting and for providing dimming effects. It works on the principle of converting electrical power to an optical signal and the output voltage’s polarity will be opposite to that of the input voltage. The TLP3555(F) is suitable for all types of AC loads and can provide dimming effects if required.

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