Power source module for LED lamp

摘要

A power source module for a LED lamp includes a filament-simulating circuit, a current limiting circuit, a rectifier, a filter, and a discharging circuit electrically connected to each other and a LED in the LED lamp. The filament-simulating circuit simulates a filament before the LED to pass through the pre-heating process of the electrical ballast in a fluorescent lamp base. The current limiting circuit, the rectifier, and the filter limit, rectify and filter the current from an external power source in the fluorescent lamp base to output a high frequency, direct current to drive the LED. The discharging circuit discharges the energy after turning the power switch off to prevent the LED lamp from flicker. Therefore, the power source module enables the LED lamp to be installed on the traditional fluorescent lamp base without modifying the circuit in the base.

主权项

1. A power source module for a LED lamp comprising:
a current limiting circuit, electrically connected to a first bi-pin terminal of the LED lamp for limiting a current from the terminal, the current limiting circuit comprising:
a first capacitance, one end of the first capacitance being electrically connected to one pin of the first bi-pin terminal;a second capacitance, one end of the second capacitance being electrically connected to the other pin of the first bi-pin terminal, and the other end of the second capacitance being electrically connected to the other end of the first capacitance; anda third capacitance, one end of the third capacitance being electrically connected to the other ends of the first capacitance and the second capacitance; a first rectifier, electrically connected to the current limiting circuit for rectifying the current from the current limiting circuit; and a filter, electrically connected between the first rectifier and at least one LED of the LED lamp for smoothing the current from the first rectifier.