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What is the difference between DC solid state relays and AC solid state relays?

Solid state relay (also known as solid state relay) English title for Solid State Relay, referred to as SSR. It uses semiconductor devices to replace traditional electrical contacts as non-contact switching devices with relay characteristics. Single-phase SSR is a four-terminal active device with two input control terminals and two output terminals. Optical isolation is provided between input and output. After DC or pulse signals are added to the input terminal to a certain current value, the output terminal can change from off-state to on-state.

2022

05-30

How do transistors work?

Transistor is a solid semiconductor device (including diodes, transistors, field effect transistors, thyristors, etc., sometimes specifically referred to as bipolar devices), with detection, rectification, amplification, switching, voltage stabilization, signal modulation and other functions. As a variable current switch, the transistor can control the output current based on the input voltage. Unlike ordinary mechanical switches, transistors use electrical signals to control their own opening and closing, so the switching speed can be very fast, and the switching speed in the laboratory can reach more than 100GHz.

2022

05-24

What is a transistor in a chip?

From the English explanation, the transistor (transistor) can be seen as a transfer (transfer)-resistor (resistor) combination, it is a kind of conditioning current or voltage installation, can switch or amplify the signal, as the basic element in the integrated circuit, the integrated circuit is composed of a large number of transistors interconnected with the circuit. The transistors in the latest Intel CPUs look like this:

2022

05-18

Introduction of Fabrication Method of Semiconductor-discharge Tube

The application of the new touch for the maintenance of communication equipment discharge tube, detailed is a kind of semiconductor discharge tube. The discharge tube is a commonly used overvoltage maintenance device in modern communication equipment, which can prevent the communication equipment from being damaged by lightning strike and surge. At present, the conductors in the wired communication network are metal wires and optical fibers. The conductors are installed outdoors, which will inevitably be affected and destroyed by nature and man-made. Lightning, power line induction and touch will introduce communication equipment to form communication equipment damage or casualties. With the development of modern communication industry, people pay more and more attention to the maintenance of communication equipment. The International Telecommunication Union and China have successively formulated corresponding specifications, requesting that telecommunication equipment must be designed with measures to prevent lightning strikes, power surges, power line sensing and power line touching. Only after passing through relevant specifications can they enter the network and use them.

2022

05-10

What is the difference between a transistor and a mos tube?

The MOS transistor is a metal-oxide-semiconductor (semiconductor) field effect transistor, or metal-insulator (insulator)-semiconductor. The source and drain of MOS tube can be switched. They are both N-type regions formed in P-type backgate. In most cases, the two regions are the same, even if the two ends are switched, the performance of the device will not be affected. Such devices are thought to be symmetrical.

2022

05-02

What are the precautions for the use of solid state relays?

Speaking of relays, we all know that it is an electrical control device, and this time we have to say solid state relays. So what is a solid state relay after all? What are the precautions for the use of solid state relays? Let's understand together. Solid state relay (SOLIDSTATERELAYS, hereinafter abbreviated as "SSR") is a new type of non-contact switching device composed of all solid state electronic components. It applies the switching characteristics of electronic components (such as switching triode, triac and other semiconductor devices) to connect and disconnect the circuit without contact and spark, so it is also called "non-contact switch". The solid state relay is a four-terminal active device, two of which are input control terminals and the other two are output controlled terminals. It has both amplification and isolation effects. It is suitable for driving high-power switch-type actuators. Compared with electromagnetic relays, it has higher reliability, no contact, long life, fast speed, and less interference to the outside world. Has been widely used.

2022

04-26

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