Knowledge Guide for Starting Thermistors (II)

The use of the shape structure: Put the thermistor on the energy-saving lamp of the electronic ballast, no need to change the track to connect the thermistor directly equipotentially at the ends of the simple resonant capacitor of the lamp, convert the electronic ballast and electronic The hard start of the energy-saving lamp is a warm-up start. The preheating time of the wire is 0.4-2.0 seconds, which can increase the lamp life by more than four times.

Use the thermistor to achieve warm-up start Note: just make the circuit to form a closed switch, Rt at a normal temperature, its resistance is greatly lower than the C2 resistance, the current through C1, Rt to form a closed circuit preheating wire. About 0.4-2 seconds later, the Joule heat temperature of Rt exceeds the Curie temperature Tc and jumps into a high-impedance state. The resistance is much higher than that of C2. The current through C1 and C2 forms a closed circuit, causing L to generate a harmonic vibration and form a high-voltage ignition. Lamps.

For some special electronic ballasts and energy-saving lamps, the larger the PTC resistance, the smaller the volume, and the lower the Curie point, the lower the power consumption and the shorter the warm-up time; The greater the consumption, the longer the warm-up time.