The basic principle of using thermistor for electronic ballast

Application principle: The PTC thermistor is used on the electronic ballast of the energy-saving lamp. The product can be directly connected to the resonant capacitor of the lamp tube without changing the line. The hard start of the electronic ballast and the electronic energy-saving lamp can be changed. The hot start, the preheating time of the filament reaches 0.4-2.0 seconds, which can extend the life of the lamp more than four times.

Based on increasing the delay time, it can be achieved by increasing the Curie temperature and volume, reducing the resistance, etc., and determining the following basic principles:

1) When the energy-saving lamp works, the temperature inside the lamp is high, and the Curie temperature of the PTC thermistor cannot be too low, otherwise the delay time is too short, and the preheating effect is not obtained, and the Curie temperature is above 100 °C;

2) When the starting line is a single capacitor, the PTC thermistor has a higher withstand voltage requirement, usually above 800V;

3) The PTC thermistor with high resistivity has a great improvement in reliability, and should be preferred when the startup characteristics are satisfied;

4) The situation at low temperature start-up must be considered. At low temperatures, the thermal balance resistance of the PTC thermistor is correspondingly low, which may cause the lamp to not start;

5) The PTC thermistor has a switching life of more than 100,000 times;

6) The warm-up time cannot be less than 0.4 seconds;

7) After the startup, the power consumption of the PTC thermistor should comply with the relevant regulations.

Understanding the basic principles can provide efficiency and reduce unnecessary hassles. If you have technical questions, please contact us and try to solve it for you.