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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.
The state relay is reliable in operation, long in life, no noise, no spark, no electromagnetic interference, fast switching speed, strong in anti-interference ability, small in size, impact resistance, oscillation resistance, explosion-proof, moisture-proof, anti-corrosion, and compatible with TTL, DTL, HTL and other logic circuits, and directly drives high-current loads with tiny control signals. The main deficiency is the existence of on-state voltage drop (corresponding heat dissipation measures are required), off-state leakage current, AC and DC cannot be used universally, the number of contact groups is small, and the indicators such as overcurrent, overvoltage, voltage rise rate and current rise rate are poor.
Solid state relays have been widely used in computer peripheral interface installation, electric furnace heating constant temperature system, numerical control machinery, remote control system and industrial automation installation. Signal lamp, flasher, lighting stage lighting control system; In a broad sense, instruments and meters can also have the functions of automatic control, alarm, signal transmission and data processing, such as pneumatic conditioning instruments, electric conditioning instruments, and distributed instrument control systems. Instrumentation can improve, expand or supplement human function. Such as microscopes, telescopes, sound level meters, acidity meters, pyrometers, etc., can expand people's functions of seeing, listening, tasting and touching external things. Some instruments, such as magnetometers and ray counters, can feel and measure physical quantities that people cannot feel. There are also some instruments that can record, calculate and count beyond human ability, such as high-speed cameras, computers, etc.
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