Introduction: What is the function of solid-state relay, introduction to the function of solid-state relay
I believe that many physics friends are very familiar with the term solid state, because our friends who study physics We all know how to learn electricity. In fact, this solid-state relay is a new contactless device composed entirely of solid-state electronic components. In our daily lives, solid-state relays are widely used in computer peripheral interface equipment and constant temperature systems. Let us learn about the role of solid-state relays.
Introduction to the functions of solid-state relays: Function
Solid-state relays are non-contact electronic switches with isolation functions. There are no mechanical contact parts during the switching process. Therefore, solid-state relays have the following functions in addition to electromagnetic In addition to the same functions as relays, it is also compatible with logic circuits, resistant to vibration and mechanical impact, has unlimited installation positions, has good moisture-proof, mildew-proof and anti-corrosion properties, and has excellent performance in explosion-proof and ozone pollution prevention. It has low input power and high sensitivity. High, low control power, good electromagnetic compatibility, low noise and high operating frequency. It has been widely used in computer peripheral interface equipment, temperature regulation, speed regulation, light dimming, motor control, electric furnace heating control, power and petrochemicals, medical equipment, financial equipment, coal, instrumentation, traffic signals and other fields.
Introduction to the role of solid-state relays: Advantages
Long life and high reliability: Solid-state relays have no mechanical parts and have solid devices to complete the contact function. Since there are no moving parts, It can work in high impact and vibration environments. Due to the inherent characteristics of the components that make up solid state relays, solid state relays have a long life and high reliability. ? Solid-state relay (2) High sensitivity, low control power, good electromagnetic compatibility: Solid-state relay has a wide input voltage range, low driving power, and is compatible with most logic integrated circuits without adding a buffer or driver (3) Fast Conversion: Because solid-state relays use solid devices, the switching speed can be from a few milliseconds to a few microseconds (4) Small electromagnetic interference: Solid-state relays have no input coils and no trigger arcing or rebound, thus reducing electromagnetic interference. Most AC output solid-state relays are a zero-voltage switch that conducts at zero voltage and turns off at zero current, reducing sudden interruptions in the current waveform and thereby reducing switching transient effects.
Introduction to the functions of solid-state relays: Disadvantages
1. The voltage drop of the tube after conduction is large, and the forward voltage drop of the thyristor or bidirectional silicon control can reach 1~2V. The saturation voltage drop of high-power transistors is also between 1 and 2V. Generally, the on-resistance of power field-effect transistors is larger than the contact resistance of mechanical contacts.
2. After the semiconductor device is turned off, there can still be a leakage current of several microamps to several milliamperes, so ideal electrical isolation cannot be achieved.
3. Due to the large voltage drop across the tube, the power consumption and heat generation after conduction are also large. The volume of high-power solid-state relays is much larger than electromagnetic relays of the same capacity, and the cost is also higher.
Well, my introduction ends here today. From the above article, we can see that the function of the solid-state relay I introduced is actually to have the functions of short-circuit protection, overload protection and overheating protection, and the combination Logic solidification packaging can realize the intelligent modules that users need, and can be directly used in control systems. The advantages are long life and high reliability. However, it also has the advantages and disadvantages of large voltage drop of the tube after conduction. I hope my introduction today can help everyone. . @2019