Durable Lighting Switching PTC Thermistor / Chip Thermistor For Preheated Start
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Durable Lighting Switching PTC Thermistor / Chip Thermistor For Preheated Start
Quick Details
• Reliable lamp starting, due to well defined inrush-current
generated time delay • Accurate resistance for ease of circuit design • Small size and durable • Available bulk-packed or taped-on-reel • Long life: More than 20 000 starts for a 20 W CFL lamp • Compliant to RoHS directive 2002/95/EC and in accordance to
WEEE 2002/96/EC
Description
Lighting Switching PTC Thermistor are used when a load in series
with the PTC thermistor has to be switched off after a time delay
and when switching occurs frequently. A typical application of switching PTC thermistor is the preheating
of electrode in energy-saving lamps or fluorescent lamps. Switching
PTC can also be used as a power resistor for loading a capacitor,
for example in power supplies or in control units of production
equipment. Application It's applicable to various types of fluorescent lamp, electronic
ballast and electronic energy-saving lamp. The PTC can be connected
across the lamp resonator without changing the circuits. It can
change hard start of the ballast and electronic energy-saving lamp
to preheated start and the preheating time of the filament can come
up to 0.4-2 seconds, which will extend the service life of the
fluorescent tube by over 4 times. Specification
Switching PTC thermistors Operating PrincipleThe application of the PTC thermistor to achieve preheated start is as follows: Immediately after power is switched on, Rt is in normal temperature state and its resistance is far lower than the C2 resistance. The current through C1 and Rt forms a return circuit to preheat the filament. After about 0.4-2 seconds, Rt joule heat temperature exceeds Curie point Tsc and skips into high resistance state of far higher than C2 resistance. The current passes through C1 and C2 to form a return circuit, which causes L resonance and produces high voltage to light the fluorescent tube.
Lighting Switching PTC Thermistors Dimensional Drawings
PTC Thermistor for Lighting Time Delay and Switching Starting Application Data Sheet
Reference information of PTC thermistors for lighting time delay and switching preheated starting applications1. The switching time Ts can be approximated as follows: Ts=Cth .V.(TRef-TA)/P This shows that the switching time can be influenced by the size of the PTC thermistor, its reference temperature and the power supplied. Switching time are lengthened by increasing the volume or the reference temperature, high power consumption by the PTC thermistor, on the other hand, results in short switching time. 2. Single capacitor starting circuit has higher demand on PTC thermistor voltage withstanding capacity, general required withstanding voltage >800V. 3. PTC thermistor reliability can be increased through higher resistivity, higher resistivity PTC thermistor shall be chosen first at the premises of satisfying starting characteristics. Reference Information for Lighting Watts Corresponding to AMWEI PTC thermistor parts1. Below 15W light , AMZ31-03 series. In the same dimension and the switching temperature, the lower the light watt, the higher the resistance at 25 centigrade (R25). The higher the R25, the higher the voltage withstanding capacity.
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