LED tube lamp with operating modes compatible with electrical ballasts
First Claim
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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Accused Products
Abstract
An LED tube lamp having an LED unit is disclosed. The LED tube lamp includes a control circuit that selectively determines whether to perform a first mode or a second mode of lighting operation according to a state of a property of an external driving signal and a switching circuit coupled to the control circuit and the LED unit. When the control circuit determines to perform the first mode of lighting operation, the control circuit controls the second circuit in a manner such that the switching circuit maintains its on state to allow continual current to flow through the LED unit, until the external driving signal is disconnected from the LED tube lamp, and when the control circuit determines to perform the second mode of lighting operation, the control circuit controls the switching circuit in a manner to regulate the continuity of current to flow through the LED unit by alternately turning on and off the switching circuit.
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Citations
35 Claims
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1. A light emitting diode (LED) tube lamp configured to receive an external driving signal, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 33)
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17. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube; a first external connection terminal and a second external connection terminal coupled to the lamp tube and configured to receive an external driving signal; a detecting circuit configured to detect a state of a property of the external driving signal; a control circuit configured to selectively determine whether to perform a first mode or a second mode of lighting according to the state of the property of the external driving signal; an LED module for emitting light, the LED module comprising an LED unit comprising an LED; 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, 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, the control circuit regulates the continuity of current to flow through the LED unit by alternately turning on and off the switching circuit. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 34)
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26. A light emitting diode (LED) tube lamp having an LED unit comprising an LED, the LED tube lamp configured to receive an external driving signal, comprising:
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a first 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 an external driving signal; a second circuit coupled to the first circuit and the LED unit; and a third circuit coupled in parallel with the second circuit, configured to provide protection for the second circuit; wherein when the first circuit determines to perform the first mode of lighting operation, the first circuit controls the second circuit in a manner such that the second circuit maintains its on state to allow continual current to flow through the LED unit, until the external driving signal is disconnected from the LED tube lamp, and when the first circuit determines to perform the second mode of lighting operation, the first circuit controls the second circuit in a manner to regulate the continuity of current to flow through the LED unit by alternately turning on and off the second circuit. - View Dependent Claims (27, 28, 29, 30, 31, 32, 35)
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Specification