Durable Lighting Switching PTC Thermistor / Chip Thermistor For Preheated Start PTC Thermistors for Lighting Switching manufacturer from China Dongguan Uchi Electronics Co.,Ltd.

Durable Lighting Switching PTC Thermistor / Chip Thermistor For Preheated Start

Place of Origin:

Guangdong, China (Mainland)


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Product Detail

Model No.: PTC Thermistors for Lightin...

Durable Lighting Switching PTC Thermistor / Chip

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 Principle

Lighting Switching PTC thermistor Application Circuit

The 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.

PTC thermistors lighting time delay switch off characteristics

Circuit of PTC Thermistors Delay operation of relay