SMT SMD processing relay classification SMT SMD processing in the relay changes according to the input signal, turn on and off the control circuit, so as to realize the automatic control and protection of power devices automatic electrical. There are many types of relays in SMT processing, according to the nature of the input signal is divided into: voltage relay, current relay, time relay, temperature relay, speed relay, pressure relay, etc. According to the principle of operation can be divided into: electromagnetic relay, inductive relay, electric relay, thermal relay and electronic relay, etc.. According to the output form can be divided into: contact and non-contact two categories. According to the use can be divided into: control and protection relays and so on. Relays in electronic equipment commonly used in the use of electromagnetic suction electromagnetic relays, the use of polarized magnetic field to maintain the working state of the magnetic retention relay, dedicated to the conversion of high-frequency circuits and high-frequency coaxial cable to match the high-frequency relay, by a variety of non-electricity (heat, temperature, pressure, etc.) control of the control relays, the use of reed switching reed relays, with a time-control effect of the time relay, as a contactless electronic switch solid-state relay. Solid-state relays as non-contact electronic switches, etc.
Original version: PCB Chinese name for "printed circuit board", also known as printed circuit boards, printed circuit boards, is an important electronic components, is the support body of electronic components, is the provider of electrical connections of electronic components. Since it is made by electronic printing, it is called "printed" circuit board. Surface assembly technology (Surface Mounted Technology) (Surface Mounted Technology acronym), is currently the most popular technology and process in the electronic assembly industry.SMT placement refers to the PCB based on the processing of a series of process flow of the abbreviation.
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