燈具用延時啟動型熱敏電阻器 產品特點： 隨著全球對于節(jié)能的需求，用于電子鎮(zhèn)流器軟啟動的熱敏電阻器越來越受到大家的重視。傳統(tǒng)的鎮(zhèn)流器啟動，未經預熱突加高壓燈絲材料會發(fā)生嚴重濺射損耗，導致燈管提前發(fā)黑報廢。而用熱敏電阻器做延時啟動的鎮(zhèn)流器，是經過預熱再加高壓點亮燈管的，燈絲材料只會產生極其輕微的濺射，從而大大延長了燈管的壽命。有關權威機構所作的試驗表明：應用PTC熱敏電阻器來做延時啟動，可以改變電子鎮(zhèn)流器、電子節(jié)能燈的硬啟動為預熱啟動，燈絲的預熱時間達0.4-2.0秒，這樣的電子鎮(zhèn)流器能使燈管壽命延長四倍以上。工作原理當高頻震蕩回路接通時，由于PTC處于冷狀態(tài)，Rt處于低阻狀態(tài)，其阻值遠遠低于C2阻值，此時燈管電壓小于它啟動所需的電壓值。于是，電流通過C1、Rt形成回路預熱燈絲。與此同時，PTC熱敏電阻也被加熱到居里溫度以上，Rt發(fā)熱溫度超過開關溫度Tsw躍入高阻狀態(tài)。其阻值遠遠高于C2阻值，電流則通過C1、C2形成回路導致LC諧振，產生高壓點亮燈管。一般情況下延長預熱時間應選用阻值較低、居里點較高、體積較大的PTC熱敏電阻器。  主要應用：產品主要應用于熒光燈電子鎮(zhèn)流器，電子節(jié)能燈中。  Delay-Time PTC Thermistors for Lamps and Lanterns    Features of Products:With the development of global energy conservation, PTC Thermistors for electronic ballast softly starting has attracted more and more public attention. The traditional ballast starting, added high-pressure filament material suddenly without preheating, will take serious sputter and loss, and make the light turn black and scrap ahead of time. However, the electronic ballasts we have researched and developed, have been through preheating and high pressure. Lighting the tube, the filament material can only produce slight sputter, and can extend the light life span greatly. Tests by some authority organizations have indicated: Using PTC Thermistor to delay starting, can change the hard starting to pre-heating starting of the electronic ballasts and electronic power-saving lamps. The pre-heating time of wires can reach to 0.4-2.0 seconds. Such electronic ballasts can make the lamp service prolonged to more than 5 times.Working Theories:When the high frequency shaking return circuit has been put through, and because PTC is in a cold state and Rt is in a low state of resistance, its resistance value is far lower than that of C2, and the light pressure is smaller than that of starting it. Then current through C1, RT forms the return circuit-preheating filament. Meanwhile, PTC Thermistor is heated to above the Curie temperature, Rt heating temperature exceeding the switch temperature TSW and leaping to the state of high resistance too. Its resistance value is far higher than that of C2, and the current goes through C1, C2, forming the return circuit and causing LC resonance and producing high pressure and lighting the tube. Generally speaking, to delay the preheating time, we should select the relatively lower resistance, taller Tc point and bigger PTC Thermistor.Main Applications  Products are mainly applied in fluorescence lamp electronic ballasts, electronic power-saving lamps, and triggers.