Patent ID: 9668308
Date: 2017-05-30
CPC Classifications: F21K,F21V,F21Y,H02M,H05B,Y02B

Claim:
1. A linear light-emitting diode (LED) tube lamp, comprising: a housing having two opposite ends; a light-emitting diode printed circuit board (LED PCB) extended between the two opposite ends of the housing, the LED PCB comprising LED arrays and copper traces disposed thereon; two lamp bases respectively connected to the two opposite ends of the housing, each lamp base comprising a respective bi-pin each with two pins protruding outwards; at least six diodes comprising four front-end diodes and two rear-end diodes, the at least six diodes configured to manage electric current flows and convert an alternating current (AC) input voltage into a direct current (DC) input voltage; at least one frequency sensitive device connected to the two rear-end diodes; and an LED driving circuit configured to receive the DC input voltage from the at least six diodes, the LED driving circuit comprising an input filter, a power factor correction (PFC) and control device, a switch controlled by the PFC and control device, a current sensing resistor, a diode, an inductor with its current charging and discharging controlled by the switch, a resistor, an output capacitor in parallel with the resistor connected to the inductor to build up an output voltage and to power the LED arrays, and a voltage feedback module configured to draw partial power from the output voltage to sustain an operation of the PFC and control device; wherein, responsive to detecting zero current in the inductor and the DC input voltage within each AC cycle of the AC input voltage, the PFC and control device generates control signals to control the switch on and off with a constant on-time and a varied off-time; wherein, when AC mains are used to power the linear LED tube lamp, an AC voltage from the AC mains is applied to one of the bi-pins electrically coupled to the four front-end diodes; and wherein, when an electronic ballast is used to power the linear LED tube lamp, an AC voltage from the electronic ballast is applied across the two bi-pins in the two opposite ends.