Siemens APT Relays – Components of Solid State Relays

Create Date: 2024-8-30 12:03:23|Source: APT/Siemens Shanghai Ergong

Solid state relays consist of three parts: the input circuit, the isolation (coupling), and the output circuit.

Input circuitry

According to the different categories of input voltage, the input circuit can be divided into three types: DC input circuit, AC input circuit and AC and DC input circuit. Some input control circuits also have TTL/CMOS compatibility, positive and negative logic control and inverting functions, which can be easily connected with TTL and MOS logic circuits.

For control signals with fixed control voltages, a resistive input circuit is used. The control current is guaranteed to be greater than 5mA. For the control signal with a large range of variation (such as 3-32V), a constant current circuit is used to ensure that the current works reliably in greater than 5mA in the entire voltage variation range.

Isolated coupling

There are two types of isolation and coupling methods for the input and output circuits of solid-state relays: photoelectric coupling and transformer coupling: photodiode-phototransistor, photodiode-bidirectional light-controlled thyristor, photovoltaic cell, to achieve isolated control of the control side and the load side; High-frequency transformer coupling is the use of the input control signal generated by the self-excited high-frequency signal is coupled to the secondary, rectified by the detection wave, and processed by the logic circuit to form a driving signal.

Output circuitry

The power switch of the SSR is directly connected to the power supply and the load side to realize the on/off switching of the load power supply. The main uses are high-power transistors (Transistor), unidirectional thyristors (Thyristor or SCR), triacs (Triac), power field-effect transistors (MOSFETs), and insulated gate bipolar transistors (IGBTs). The output circuit of the solid state relay can also be divided into DC output circuit, AC output circuit and AC and DC output circuit. According to the load type, it can be divided into DC solid state relay and AC solid state relay. Bipolar devices or power MOSFETs can be used for DC output, and two SCRs or one bidirectional SCR are typically used for AC output. AC solid state relays can be divided into single-phase AC solid state relays and three-phase AC solid state relays. AC solid-state relays, according to the timing of on-on and off-, can be divided into random AC solid-state relay and zero-crossing AC solid-state relay.

Siemens APT Relays – Components of Solid State Relays

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