38 LED energy-saving lamp circuit

This 38 LED energy-saving lamp circuit uses a 220V power supply. The 220V AC power is stepped down by the C1 step-down capacitor, then rectified by the full bridge, filtered by C2, and then passed through the current limiting resistor R3 to provide constant current power to the 38 LEDs connected in series. R1 in the picture It is a protection resistor, R2 is the discharge resistor of capacitor C1, R3 is a current limiting resistor to prevent the voltage and temperature from increasing, and the LED current increases. C2 is a filter capacitor. In fact, the filter circuit is not needed in the LED circuit. C2 is used to Prevent the damage to the LED caused by the inrush current when turning on the light. When the light is turned on, there will be a large charging current due to the presence of C1. This current flowing through the LED will cause damage to the LED. With the intervention of C2, the light will be turned on. The charging current is completely absorbed by C2, which protects the light from impact. 38 LED energy-saving lamp circuit: