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application scheme
Circuit protection scheme

circuit protection

date: 2019-08-29
view count: 31

Circuit protection is to protect the electronic components in the circuit mainly in over voltage, over current, surge, electromagnetic interference, such as the case from being damaged, with the development of science and technology, electric/electronic products increasingly diversified and complicated, the application of circuit protection components have not past simple glass tube fuse, protection devices have a pressure sensitive resistance, TVS, gas discharge tube, etc.Has developed into a wide range of new electronic components field.


Over current protection


It automatically cuts off power when the current is too large to prevent the damage of components in the circuit caused by exceeding the rated current of [1].



Over-voltage Protection


Mainly is to prevent overvoltage or electrostatic Discharge (Discharge Suppression) damage to electronic components, are widely used in telephones, fax machines and high-speed transmission interface, USB, IEEE1394, HDMI, SATA, etc all kinds of electronic systems products, electronic communication equipment, in particular, on how to avoid because of the abnormal Voltage (Over - Voltage or EOS (Electrical Over Stress) or electrostatic Discharge (ESD) and cause harm to electronic equipment loss is particularly important.



Overheat protection (OT)


Temperature protection components from commercialization to now, has passed a jia, over temperature protection components widely used in the temperature have special requirements, such protection components in accordance with the actuation principle can be divided into chemical actuator type, low temperature alloy actuator type, including chemical actuation type main characteristics of the products is can do low temperature type products (there are 48 ℃), but the structure is relatively complex, high cost;Low-temperature alloy type actuation is mainly a large-diameter low-temperature fuse to conduct the function, must ensure that the heat generated by the rated current will not melt the fuse, this low-temperature fuse is generally through adjusting the proportion of tin (Sn), copper (Cu), silver (Ag), Bi (Bi), indium (In) and other components to adjust its melting point.



Over temperature over current protection (TFR)


In recent years, with application of ascension, pure temperature protection function, can not meet the rapid electrical appliances, motor, motor and the demand of the 3 c product safety protection, thus developed can meet again because of the abnormal temperature, electric current and voltage cases at the same time to monitor and timely protection components, and the rise of the sample components mainly for lithium ion battery and lithium polymer battery for most applications.



Over flow pressure (OCOV)

With the complication of modern electronic products, for the protection of the component using request also is increasing day by day, such as the protection of the comprehensive, limited reserved space, etc., as these requirements are put forward, to protect components industry raised a hot wave of a combination of packaging, as mentioned above through the thermal protection is a combination of encapsulation, but most current through the combination of voltage protection packaging products that is still in development stage, has not yet mature commercial product to market.

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