LED tube lamp with overcurrent and/or overvoltage protection capabilities

An LED tube lamp with overcurrent and/or overvoltage protection capabilities, comprising:

• a lamp tube;
• a first pin and a second pin coupled to the lamp tube, for receiving an external driving signal;
• a first rectifying circuit, coupled to the first and second pins, for rectifying the external driving signal to produce a rectified signal;
• a filtering circuit, coupled to the first rectifying circuit, for filtering the rectified signal to produce a filtered signal, wherein the filtering circuit has a first filtering output terminal and a second filtering output terminal;
• an LED driving circuit, coupled to the filtering circuit and an LED module, the LED driving circuit being configured to receive the filtered signal to produce a driving signal, and the LED module for receiving the driving signal for emitting light;
• and
• a protection circuit, coupled to the filtering circuit, and configured to determine whether to enter a protection state, wherein upon entering the protection state, the protection circuit limits or restrains a voltage and/or current level of the filtered signal, and wherein:
• the protection circuit includes a voltage clamping circuit and a voltage division circuit:
• the voltage clamping circuit is coupled to the first filtering output terminal and the second filtering output terminal, and the voltage division circuit is coupled to the voltage clamping circuit, the second filtering output terminal, and a biasing voltage source;
• and
• the voltage division circuit is configured to receive a current detection signal, which represents a magnitude of current through the LED module.