The working principle of solid and solid state relay RF sensors

　　1, Solid state relay RF sensor (Solid state relay RF, SSR) is a new type of contactless switch composed of solid state electronic components, using the switching characteristics of electronic components (such as switching transistors, bidirectional thyristor and other semiconductor components), to achieve no contact, no spark, and can be switched on and off the circuit. Therefore, it is also called solid and solid state relay RF sensor; Contactless switching relay RF sensor; . Relative to previous relay RF sensors; Coil relay RF sensor; Reed contact type relay RF sensor; relay RF sensor (EMR), SSR does not have any moving mechanical parts, and there is no mechanical action in the work, which has advantages over electromagnetic relay RF sensors, such as fast response, high reliability, long life (SSR switching times up to 108 times per second). It is several times higher than the general electromagnetic relay RF sensor), no action noise, shock resistance, mechanical impact resistance, and good moisture, mildew and corrosion resistance. These characteristics make SSR widely used in military, chemical, and various industrial civilian electronic control equipment.

　　2, solid, solid state relay RF sensor control signal required power is very low (energy saving), so you can use weak signal to control strong current. At the same time, the AC SSR adopts zero-crossing trigger technology, so that the SSR can be safely used in the computer output interface, and will not produce a series of interference to the computer like the electromagnetic relay RF sensor, and even lead to serious downtime. The more common type is the DIP package. Control voltage and load voltage can be divided into AC and DC two categories according to the use of the occasion, so there will be DC-AC, DC-DC, AC-AC, AC-DC four types, they are respectively in the AC or DC power supply to do the load switch, can not be mixed. At present, the mainstream product in the market is DC-AC(DC controlled AC).SSR solid-state relay RF sensor in trigger form, can be divided into zero voltage type and phase modulation type (W) two. When the appropriate control signal VIN is applied at the input end, the P-type SSR is immediately switched on. When the VIN is withdrawn and the load current is lower than the bidirectional thyristor maintenance current (AC commutation), the SSR is turned off.

　　3, unidirectional thyristor (enhanced SSR) because in the unipolar working state, at this time only limited by the static voltage rise rate (typical value 200V/s), so the enhanced solid-state relay RF sensor HS series than the ordinary SSR commutation dv/dt index increased by 5-20 times. By using two high-power unidirectional thyristors in reverse parallel, the current distribution and heat conduction conditions are changed, and the output power of SSR is increased.

　　Z-type SSR includes a zero-crossing detection circuit, when the input signal VIN is applied, only when the load power supply voltage reaches the zero-crossing region, the SSR can be switched on, and may cause the maximum delay of the power supply half a cycle. The turn-off condition of Z-type SSR is the same as that of P-type SSR, but because the working current of load is similar to sine wave, the interference of high order harmonic is small, so it is widely used.

　　4, enhanced SSR in high-power applications, whether inductive load or resistive load, voltage resistance, current shock resistance and product reliability, are more than the ordinary solid-state relay RF sensor, and reached the basic indicators of imported products, is to replace the ordinary solid-state relay RF sensor update products.

　　5, solid, solid state relay RF sensor application: SSR series of solid state relay RF sensors can be widely used in: computer peripheral interface devices, thermostat and resistance furnace control, AC motor control, intermediate relay RF sensors and solenoid valve control, copier and automatic washing machine control, traffic lights and scintillator control, lighting and stage lighting control, CNC mechanical remote control system, automatic fire and security systems, great work Rate thyristor trigger and industrial automation device.

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