LED tube lamp for operating in different modes
First Claim
1. A light emitting diode (LED) tube lamp configured to receive an external driving signal, the LED tube lamp comprising:
- an LED module for emitting light, the LED module comprising an LED unit comprising an LED;
a rectifying circuit for rectifying the received external driving signal to produce a rectified signal;
a mode determination circuit coupled to the rectifying circuit, for the LED tube lamp to be able to operate in each of two modes of lighting operation, and configured to generate a signal for determining whether to perform a first mode or a second mode of lighting operation according to a state of a property of the received external driving signal; and
a noise suppressing circuit coupled to the rectifying circuit and the LED unit, for reducing abrupt change in current flowing through the LED tube lamp;
wherein the mode determination circuit includes or is coupled to a switching circuit coupled to the LED unit and configured to receive the signal generated by the mode determination circuit, andthe switching circuit is configured to conduct current or be cut off according to the signal generated by the mode determination circuit;
wherein the mode determination circuit includes or is coupled to a detecting circuit configured to detect a state of a property of the received external driving signal or the rectified signal, and the detecting circuit comprises a voltage divider configured to produce a first fraction voltage of the rectified signal and a second fraction voltage of the rectified signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A light emitting diode (LED) tube lamp configured to receive an external driving signal includes an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit having a first output terminal and a second output terminal for outputting the rectified signal; a filtering circuit connected to the LED module, and configured to provide a filtered signal for the LED unit; and a protection circuit for providing protection for the LED tube lamp. The protection circuit includes a voltage divider comprising two elements connected in series between the first and second output terminals of the rectifying circuit, for producing a signal at a connection node between the two elements; and a control circuit coupled to the connection node between the two elements, for receiving, and detecting a state of, the signal at the connection node. The control circuit includes or is coupled to a switching circuit coupled to the rectifying circuit, and the switching circuit is configured to be triggered on or off by the detected state, upon the external driving signal being input to the LED tube lamp, to allow discontinuous current to flow through the LED unit.
75 Citations
17 Claims
-
1. A light emitting diode (LED) tube lamp configured to receive an external driving signal, the LED tube lamp comprising:
-
an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the received external driving signal to produce a rectified signal; a mode determination circuit coupled to the rectifying circuit, for the LED tube lamp to be able to operate in each of two modes of lighting operation, and configured to generate a signal for determining whether to perform a first mode or a second mode of lighting operation according to a state of a property of the received external driving signal; and a noise suppressing circuit coupled to the rectifying circuit and the LED unit, for reducing abrupt change in current flowing through the LED tube lamp; wherein the mode determination circuit includes or is coupled to a switching circuit coupled to the LED unit and configured to receive the signal generated by the mode determination circuit, and the switching circuit is configured to conduct current or be cut off according to the signal generated by the mode determination circuit; wherein the mode determination circuit includes or is coupled to a detecting circuit configured to detect a state of a property of the received external driving signal or the rectified signal, and the detecting circuit comprises a voltage divider configured to produce a first fraction voltage of the rectified signal and a second fraction voltage of the rectified signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12)
-
-
10. A light emitting diode (LED) tube lamp configured to receive an external driving signal, the LED tube lamp comprising:
-
an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the received external driving signal to produce a rectified signal; a mode determination circuit coupled to the rectifying circuit, for the LED tube lamp to be able to operate in each of two modes of lighting operation, and configured to generate a signal for determining whether to perform a first mode or a second mode of lighting operation according to a state of a property of the received external driving signal; and a noise suppressing circuit coupled to the rectifying circuit and the LED unit, for reducing abrupt change in current flowing through the LED tube lamp; wherein the mode determination circuit includes or is coupled to a switching circuit coupled to the LED unit and configured to receive the signal generated by the mode determination circuit, and the switching circuit is configured to conduct current or be cut off according to the signal generated by the mode determination circuit; wherein the mode determination circuit comprises a voltage determination circuit comprising a symmetrical trigger diode and a resistor connected in series and a transistor or switch; and
a connection node between the symmetrical trigger diode and the resistor is connected to a control end of the transistor or switch.
-
-
13. A light emitting diode (LED) tube lamp configured to receive an external driving signal, the LED tube lamp comprising:
-
an LED module for emitting light, the LED module comprising an LED unit comprising an LED; a rectifying circuit for rectifying the received external driving signal to produce a rectified signal; a control circuit coupled to the rectifying circuit, for the LED tube lamp to be able to operate in each of two modes of lighting operation, and configured to generate a signal for determining whether to perform a first mode or a second mode of lighting operation by detecting a state of a property of the received external driving signal; and a noise suppressing circuit coupled to the rectifying circuit and the LED unit, for reducing abrupt change in current flowing through the LED tube lamp; wherein the control circuit includes or is coupled to a switching circuit coupled to the LED unit and configured to receive the signal generated by the control circuit, and the switching circuit is configured to conduct current or be cut off according to the signal generated by the control circuit, the control circuit includes or is coupled to a detecting circuit configured to detect a state of a property of the received external driving signal or the rectified signal, and the detecting circuit comprises a voltage divider configured to produce a first fraction voltage of the rectified signal and a second fraction voltage of the rectified signal. - View Dependent Claims (14, 15, 16, 17)
-
Specification