Toshiba Photo Relay TLP3547 Review - Comparison with Mechanical Relays

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Toshiba Photo Relay TLP3547 Review - Comparison with Mechanical Relays [Copy link]

 

This review was completed before the National Day. After the National Day, I was too busy to post it a few days later. Awkward.

The following is the official review:

As shown in the figure, the switches of the photorelay and the mechanical relay are connected to the same control signal. The oscilloscope is set to single trigger to see which relay's signal can generate the trigger signal first.

As shown in the figure, we can easily see that the yellow wave responds faster than the blue wave. The yellow one is the photorelay, and the blue one is the mechanical relay. It is obvious that the photorelay responds faster than the mechanical relay, nearly4ms.

In addition, in the measurement, we also found that the mechanical relay consumes more current during the switching process. In the signal output by the signal generator, the photorelay can be controlled, but the mechanical relay cannot be made to work.

Evaluation summary: Except for working under high voltage conditions, photorelays are obviously better than mechanical relays, with faster response speed, lower starting current, and smaller size. They have a good effect when used in low-power products. Of course, the cost of photorelays should also be considered.