Patent attributes
A light emitting diode (LED) tube lamp includes a lamp tube; a first pin and a second pin coupled to a first end of the lamp tube, and a third pin coupled to a second end of the lamp tube; a first rectifying circuit comprising diodes and connected to the first and second pins, and a second rectifying circuit comprising diodes and connected to the third pin and an output terminal of the first rectifying circuit; a filtering circuit coupled to the two rectifying circuits and the LED module, for filtering the rectified signal to produce a filtered signal; an LED module comprising LEDs for emitting light, the LED module configured to be driven by the rectified signal or the filtered signal; and a driving circuit coupled between the two rectifying circuits and the LED module, and configured to drive the LED module. The LED tube lamp is configured to receive the external driving signal and emit light in each of two power supply arrangements, the two arrangements being respectively that the external driving signal is a low frequency signal input and transmitted through the first and second pins, and that the external driving signal is a low frequency signal input and transmitted through one of the first and second pins and the third pin across the two ends of the lamp tube. The LED tube lamp is configured such that when the received external driving signal is a low frequency signal, the LED tube lamp causes the rectified signal or the filtered signal to be used by the driving circuit for driving the LED module to emit light.
