SCR breakdown at 3 main reason

by:Positioning     2021-02-06
Silicon controlled rectifier as an indispensable one of the main parts of inverter within are known, the breakdown of the main causes of SCR has it at 3 o 'clock. To explain for everybody below 1, over-voltage breakdown: over-voltage breakdown is one of the breakdown of the main causes of thyristor, thyristor bear ability of overpressure is almost have no time, even in a short period of time a few milliseconds over voltage will be breakdown, so the practical application circuit, must be connected to the RC absorption circuit, thyristor at both ends to avoid various instantaneous overvoltage caused by the interference of random pulse. If the SCR breakdown happens often, please check the absorption circuit various components for burn out or fail. 2, overcurrent and overheating breakdown: actually flow breakdown and overheat breakdown is the same thing. Breakdown is current flow through the silicon controlled thermal effect when the chip inside the chip, the chip temperature, when the temperature reaches 175 ℃ chip will be invalid and cannot be restored. Under normal conditions of use, as long as the working current shall not exceed the rated current thyristor is not going to happen this kind of thermal breakdown, because the flow principle of breakdown is caused by temperature, and temperature rise process needs a certain time, so the flow in a short time ( A few hundred milliseconds to several seconds) Is generally not breakdown. 3, overheat breakdown: overheat breakdown here refers to the working current is not more than rated current of the silicon cases occurring in the course of thermal breakdown, in the cause of the breakdown is mainly thyristor assisted radiator bad work and cause thyristor chip temperature lead to breakdown. For the water, however, work, mainly check whether the water temperature is too high ( General requirements water temperature should be below 25 ℃, but the highest no more than 35 ℃) The flow adequacy; To use air cooling way of working, should check whether the fan revolution is normal, and the environment temperature is not too high, but neither air cooling or water cooling, if you are replacing SCR just replace the chip, when installation should pay attention to the contact area between the chip and heat sink must assure good contact, contact surface to smooth, cannot have scratches or place into the concave and convex and can not have dust, to ensure adequate and uniform pressure, especially in silicon controlled water-cooled, three tensile strength of the bolt must be uniform, and regularly check and clean up the scale, scale too much can affect the cooling effect lead to breakdown of overheating. In addition if multiple replacement chips will also influence the result of the radiator surface deformation and heat dissipation effect, if one only of your machine breakdown and silicon controlled rectifier often find other cause, when you should consider replacing SCR, together with the radiator replacement together
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