Why is the heater with solid state relay better?
Switching frequency is not high, why still use solid state relay? After all, too expensive.
If the power is not, it may be because the volume requirements, the other relay electric shock life, the longer the electronic
In many applications, it is necessary to switch power components very quickly (from a few watts to several kilowatts). A good example is the control of the heater components in the temperature control system. Through the wide pulse amplitude modulation to adjust the heating of the input system, periodically switch the fixed power of the heating element, from a few seconds to a few minutes. Mechanical relays have limited switching times because their components are broken after tens of thousands of times. SSR does not have these problems. If applied properly, you can run infinitely.
Solid state relay without spark. No noise. Small interference. No contact contact. Long life and other advantages. Better than the average relay.
(1) solid state relays because there is no mechanical parts, so in high impact, vibration environment, due to the composition of solid-state relay components of the inherent characteristics, so the solid state relay determines the long life, high reliability.
(2) Solid state relays have a wide input voltage range, low drive power, and are compatible with most logic integrated circuits without buffering or drivers.
(3) solid state relays because of the use of solid devices, switching speed from a few milliseconds to a few micro
(4) solid state relay does not enter the "coil", no contact arcing and bounce, thus reducing the electromagnetic interference. The solid state relay is powered by a zero voltage switch that reduces the sudden interruption of the current waveform, thereby reducing the switching transient.
So still use solid state relays
