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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First, the advantages of electric heating plate
1, electric heating plate is flat and thin slab design, more simple structure heat evenly, easy to install and use.
2, electric heating plate is made of stainless steel, ceramics and other material as the outer shell, electricity thermal bonding wire was closed in the interior of the electric heating plate, so as the enclosed heating, heating the halogen-light, no peculiar smell, security is good, suitable for all kinds of working environment.
Second, use the advantages of electric heating plate is numerous, therefore has a widespread application in the production and living, from the common ground heating, electric heating water bottle, environment temperature to keep to the laboratory experiment, involve the use of electric heating plate. At present, electric heating board is widely used in industry, agriculture, civil, defense, science and technology and medical and health care and other fields.
Three, classification, electric heating plate is not clear, the classification of dongguan canca electric cable co., LTD in the market of electric heating plate has stainless steel electric heating plate, ceramic electric heating plate, silicone rubber, electric heating plate, carbon crystal heating plate and carbon fiber electric heating board, etc., the main difference is the different in the outer shell material or different inner heating materials, such as stainless steel electrothermal board and ceramic electric heating plate belongs to the shell material is different, the rest of the several for fever materials are different.
Four, the principle of electric heating plate fever materials for electric thermal bonding wire, its working principle is very simple, is the basic electric heating effect. Electric heating plate, an electric current passes through electric thermal bonding wire, electric thermal bonding wire will be fever, converts electrical energy into heat energy, and conduction to the outer shell. Electric heating plate design with insulation materials, ensure the current when the electric thermal bonding wire work not the user security hidden danger.
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