Solid state relay In simple words with examples and calculations.

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ElectronicsClub

Published on May 21, 2024
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A solid-state relay is a semiconductor device consisting of a light-emitting diode and a pair of transistors. When current flows through the LED, it emits light, which opens the transistors. This ensures galvanic isolation of electrical circuits. One of the advantages of a solid-state relay is the low power spent on control, so such devices are often used as a link between microcircuits, microcontrollers and a powerful, relatively high-voltage load. Unlike optocouplers, the semiconductor devices in question can switch the load in both direct current and alternating current electrical circuits. In addition to field-effect transistors, triacs can also be used as actuators. The main parameters of solid-state relays are control current, voltage drop across the control LED, maximum load current, permissible voltage, and turn-on and turn-off time. Due to the absence of moving mechanical parts, a solid-state relay is more reliable than an electromagnetic relay, there is no chatter, wear, oxidation or sticking of contacts; higher response speed and operating frequency. The only indisputable advantage of electromagnetic relays is the low contact resistance of the contacts in the closed state, which allows, all other things being equal, to pass large load currents. 1. How does an optocoupler work + calculation: • How does an optocoupler and optocoupler work. Practical... 2. Optocoupler: • Optocoupler is simple. Protection of microcircuits... 3. Transistor switch from A to Z: • Transistor switch from A to Z. Practical... 4. Calculation and selection of a driver for transistors: • Driver for MOSFET and IGBT Principle in... 5. How does an electromagnetic relay work: • Lesson 23. How does an electromagnetic RELAY work... #relay #solidstateRelay #electronicsclub

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