PTC Thermistor for starting of energy saving lights and electronic ballast

General

MZL/MZI series of PTC Thermistor are 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.

Major parameter

Rated zero power resistance R25（Ω）
Switch temperature (also called Curie temperature). TC（℃）
Maximum current Imax(mA)
Withstanding voltage V_AC(V)
Dimension (mm)

Operating principle and example

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.
To a certain electronic ballast, energy saving light, higher PTC thermistor resistance, smaller PTC ceramic body dimension, lower switch temperature, will lead to its lower power consumption, shorter preheating time, conversely, larger power consumption, longer preheating time..