Led tube lamp

A ballast by-pass light-emitting diode (LED) tube lamp, comprising:

• a lamp tube;
• two end caps, respectively disposed on opposite sides of the lamp tube, wherein each end cap has an external connection terminal for receiving an external driving signal having a frequency substantially equal to 50 Hz or 60 Hz;
• a power supply module, electrically connected to the external connection terminals and configured to generate a lamp driving signal based on the external driving signal;
• and
• an LED module, disposed in the lamp tube and electrically connected to the power supply module, for receiving the lamp driving signal,
• wherein the power supply module comprises:
• a current limiting circuit, electrically connected between at least one of the external connection terminals and the LED module, and configured to limit a current flowing through the external connection terminals and the LED module to less than a predetermined value when being enabled and to conduct a current above the predetermined value when being disabled;
• and
• an electric shock detection circuit, configured to detect a signal on a detection path of the ballast by-pass LED tube lamp and control the enable/disable state of the current limiting circuit according to a detection result,
• wherein at least some electronic components of the power supply module are connected via a power circuit board, and the power circuit board is disposed in at least one of the end caps parallel to an axial direction of the lamp tube.

A DC-to-DC power converter with leakage current protection, wherein the DC-to-DC power converter has an input side and an output side and comprises:

• a constant current controller, configured to generate a lighting control signal having a pulse waveform;
• a power switch, electrically connected to the constant current controller and configured to be switched according to the lighting control signal;
• a conversion circuit, electrically connected to the power switch and configured to absorb and release power received from the input side in response to the switching state of the power switch so as to generate a driving signal at the output side;
• a feedback circuit, configured to generate a feedback signal by sampling a signal on at least one of the input side and the output side and to transmit the feedback signal to the constant current controller;
• and
• a detection circuit, electrically connected to the constant current controller and the input side and configured to detect a signal at the input side and generate an installation detection signal, wherein:
• under an installation detection mode, the constant current controller outputs the lighting control signal with at least one first pulse and determines whether to enter a normal driving mode according to the installation detection signal;
• and
• under the normal driving mode, the constant current controller outputs the lighting control signal with a plurality of second pulses and modulates the second pulses according to the feedback signal.