Energy-saving lamp preheating soft start PTC thermistor circuit schematic

Parallel thermistor / NTC thermistor / product complete / Sunlord first-class agent

NCP18XH103F03RB MURATA Murata thermistor original spot

The PTC thermistor is used in the electronic ballast of the energy-saving lamp, and the product can be directly connected to the resonant capacitor of the lamp tube without changing the line, and the hard start of the electronic ballast and the electronic energy-saving lamp can be changed to be preheating start. The preheating time of the filament is 0.4-2.0 seconds, which can extend the life of the lamp more than four times.
The preheating start is achieved by applying a PTC thermistor as shown. When the switch is just turned on, Rt is in a normal temperature state, its resistance is much lower than the resistance value of C2, and the current passes through C1, Rt to form a loop preheating filament. After about 0.4 to 2 seconds, the Rt Joule heat temperature exceeds the Curie temperature Tc and jumps into a high resistance state. The resistance value is much higher than the C2 impedance. The current forms a loop through C1 and C2 to cause L resonance, and a high voltage lighting lamp is generated.
For a particular electronic ballast or electronic energy-saving lamp, the larger the PTC resistance value, the smaller the volume, and the lower the Curie temperature, the smaller the power consumption and the shorter the warm-up time; The greater the power consumption, the longer the warm-up time.