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LED tube lamp with operating modes compatible with electrical ballasts

  • US 9,775,215 B2
  • Filed: 09/07/2016
  • Issued: 09/26/2017
  • Est. Priority Date: 09/28/2014
  • Status: Active Grant
First Claim
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1. A light emitting diode (LED) tube lamp configured to receive an external driving signal, comprising:

  • an LED module configured to emit light, the LED module comprising an LED unit comprising an LED;

    a control circuit configured to selectively determine whether to perform a first mode or a second mode of lighting operation according to a state of a property of a received rectified signal produced by a rectifying circuit;

    a switching circuit coupled to the control circuit and the LED unit; and

    a protection circuit coupled in parallel with the switching circuit, configured to provide protection for the switching circuit;

    wherein the control circuit is configured such that when the LED tube lamp performs the first mode of lighting operation, the control circuit allows continual current to flow through the LED unit by maintaining an on state of the switching circuit, until the external driving signal is disconnected from the LED tube lamp; and

    when the LED tube lamp performs the second mode of lighting operation, the control circuit regulates the continuity of current to flow through the LED unit by alternately turning on and off the switching circuit.

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