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| 一、Basic principle |
| The high polymer PTC full title "the high polymer positive temperaturecoefficient thermistor", has the fine electric current protectionfunction as a result of its material special performance. The highpolymer PTC series in the line (like chart one), in the normalcondition it assumes the low resistance number condition, theoperating current may smoothly pass; When in the electric circuitappears the exceptionally big electric current, its impedance rapidlyincreases (assumes high resistance number condition), effectivelylimits the big electric current to pass, the protection circuit isnot damaged (like chart two). After the fault current removes, thehigh polymer PTC resistance number rapid drop restores to the lowresistance number condition. |
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| chart one |
chart two |
chart three |
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二、Selects the guide
Uses high polymer PTC both the security and to be convenient, isdouble wins the strategy. Selects when first considered the workingvoltage should be smaller than is equal to high polymer PTC to be ablealong with the greatest voltage; Next is matches the good operatingcurrent the size, in the specification book arranges in order theoperating current (IH) is refers in the working conditions temperature25 ℃ time magnitude of current, like the practical work ambienttemperature is different with it, but also should consider thetemperature current loss factor, specifically refers to the chartthree. Finally also must consider installs the way (for exampleplug-in unit, optical glass insertion). Other technical specificationreference specification books. If has the peculiar circumstance,please directly relates with the our company, whether or not speciallyprocesses. |
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Next Altogether 2 pages |
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