Linear solid-state lighting with a wide range of input voltage and frequency free of fire and shock hazards

A linear light-emitting diode (LED) tube lamp, comprising:

• a housing having two ends;
• a light-emitting diode printed circuit board (LED PCB), the LED PCB comprising LED arrays disposed thereon;
• two lamp bases respectively connected to the two ends of the housing, each lamp base comprising a bi-pin each with two pins protruding outwards, each lamp base further comprising an input module comprising a shock protection switch;
• a bridge rectifier configured to convert an alternating current (AC) input voltage from an electronic ballast or AC mains into a direct current (DC) voltage;
• and
• an LED driving circuit configured to receive the DC voltage, 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 used 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 within an AC cycle of the input voltage, the PFC and control device generates a zero current detection signal to control the switch on and off with a constant on-time and a varied off-time;
• wherein, for each lamp base, when the respective shock protection switch is off, power from the AC mains or the electronic ballast is decoupled from the linear LED tube lamp;
• and
• wherein, for each lamp base, when the bi-pin is installed in a lamp socket, the respective shock protection switch is actuated to couple power from the AC mains or the electronic ballast to the linear LED tube lamp.