LED TUBE LAMP WITH TWO OPERATING MODES COMPATIBLE WITH ELECTRICAL BALLASTS

摘要

An LED tube lamp is disclosed that includes a lamp tube (1); two external connection terminals (511, 512) coupled to the lamp tube (1) for receiving an external driving signal; a rectifying circuit (510) for rectifying the external driving signal to produce a rectified signal; a ballast interface circuit (1510) configured to detect a state of a property of the rectified signal, for selectively determining on performing a first mode or a second mode of lighting according to the state of the property; and an LED module (530) for emitting light which comprises an LED unit (632) comprising an LED. When the LED tube lamp (1) performs the first mode, the ballast interface circuit (1510) allows continual current to flow through the LED unit (632) until the external driving signal is disconnected from the LED tube lamp (1). When the LED tube lamp (1) performs the second mode, the ballast interface circuit (1510) regulates the continuity of current to flow through the LED unit (632).