Each product has its own characteristics and purposes, they now see hair hotline has what effect?
Hair hotline is high temperature resistant, warming faster, long service life and stable resistance, power deviation is small, uniform pitch, after drawing the surface bright and clean, widely used in both industrial furnace, heating of the air conditioning equipment, all kinds of oven, electric heat pipe and household electrical appliances, etc. According to user needs, design and produce all kinds of non-standard industrial and civil bar. Hair hotline is a pressure limiting type protection device. Using the nonlinear characteristics of the pressure sensitive resistance, when overvoltage in between the poles of varistor, varistor voltage clamp can be to a relatively fixed voltage value, so as to realize the level after circuit protection. Pressure sensitive resistance of main parameters are: pressure sensitive voltage, flow capacity and junction capacitance, response time, etc.
Hair hotline response time for ns, faster than the air discharge tube, slightly slower than TVS tube, usually used in electronic circuit overvoltage protecting its response speed can meet the requirements. Junction capacitance of varistor is generally of the order of several hundred to several thousand Pf scope, in many cases should not be used directly in the protection of the high frequency signal lines, used in ac circuit protection, because its junction capacitance is increased leakage current, in the design of protection circuit requires full consideration. Flow capacity of varistor is larger, but smaller than gas discharge tube.
Hair hotline is when to add on it when the voltage is lower than its threshold "UN", current flow through the tiny, equivalent to a closing valve, when the voltage is more than the UN, the flow through the current surge, equivalent to open the valve. Use this function, can inhibit the abnormal overvoltage often appears in circuit, protect circuit from overvoltage damage. Hair hotline in addition to the "safety valve" to protect effect, also into some additional effect, and this is known as "secondary effect", and it should not be reduced work performance of the system. At this time to consider three factors, one is the pressure sensitive resistance itself capacitance (dozens to tens of thousands of PF), the second is the leakage current under the system voltage, three is a varistor through source impedance coupling nonlinear current impact on the rest of the circuit.
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The above is the basic purpose of hair hotline, if you have any other questions or want to know more information on this please contact us! And please give us your valuable Suggestions, we always welcome you to inquire consultation: http://www.dgdianrexian.com.
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