Light emiting diode (LED) tube lamp compatible with different ballasts providing external driving signal
First Claim
1. A light emitting diode (LED) tube lamp, comprising:
- a lamp tube, having a first external connection terminal at a first end of the lamp tube and a second external connection terminal at a second end of the lamp tube, for receiving an external driving signal;
a rectifying circuit configured to rectify the external driving signal to produce a rectified signal;
a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal;
an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light, wherein the LED module comprises an LED unit;
a current-limiting element for receiving the external driving signal, the current-limiting element coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit; and
a ballast interface circuit coupled to the current-limiting element and having a first terminal and a second terminal, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a detection circuit and a switching circuit coupled to the detection circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast, and to conduct or cut off the switching circuit based on a result of the detection, andwherein the detection circuit is configured such that, when the external driving signal is from a ballast and is being input to the LED tube lamp, the detection circuit conducts the switching circuit according to a state of a property of a detection signal transmitted through the first terminal and the second terminal,wherein the ballast interface circuit comprises a sampling element connected to the switching circuit and the detection circuit comprises a control circuit connected to the sampling element, and the sampling element is configured to reflect a state of a property of, or produce, the detection signal upon the external driving signal being input to the LED tube lamp, which detection signal then results in the control circuit being turned on or off.
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Accused Products
Abstract
A light emitting diode (LED) tube lamp includes: a lamp tube, for receiving an external driving signal, a rectifying circuit, a filtering circuit, and an LED module coupled to the filtering circuit and configured to receive a filtered signal for emitting light, wherein the LED module comprises an LED unit, a current-limiting element for receiving the external driving signal, the current-limiting element coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit, and a ballast interface circuit coupled to the current-limiting element and having a first terminal and a second terminal, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a detection circuit and a switching circuit coupled to the detection circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast, and to conduct or cut off the switching circuit based on a result of the detection. The detection circuit is configured such that, when the external driving signal is from a ballast and is being input to the LED tube lamp, the detection circuit conducts the switching circuit according to a state of a property of a detection signal transmitted through the first terminal and the second terminal.
63 Citations
29 Claims
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1. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube, having a first external connection terminal at a first end of the lamp tube and a second external connection terminal at a second end of the lamp tube, for receiving an external driving signal; a rectifying circuit configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal; an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light, wherein the LED module comprises an LED unit; a current-limiting element for receiving the external driving signal, the current-limiting element coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit; and a ballast interface circuit coupled to the current-limiting element and having a first terminal and a second terminal, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a detection circuit and a switching circuit coupled to the detection circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast, and to conduct or cut off the switching circuit based on a result of the detection, and wherein the detection circuit is configured such that, when the external driving signal is from a ballast and is being input to the LED tube lamp, the detection circuit conducts the switching circuit according to a state of a property of a detection signal transmitted through the first terminal and the second terminal, wherein the ballast interface circuit comprises a sampling element connected to the switching circuit and the detection circuit comprises a control circuit connected to the sampling element, and the sampling element is configured to reflect a state of a property of, or produce, the detection signal upon the external driving signal being input to the LED tube lamp, which detection signal then results in the control circuit being turned on or off. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An LED tube lamp, comprising:
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a lamp tube, having a first external connection terminal at a first end of the lamp tube and a second external connection terminal at a second end of the lamp tube, for receiving an external driving signal; a rectifying circuit configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal; an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light, wherein the LED module comprises an LED unit; a current-limiting element for receiving the external driving signal, the current-limiting element coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit; and a ballast interface circuit coupled to the current-limiting element and having a first terminal and a second terminal, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a detection circuit and a switching circuit coupled to the detection circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast, and to conduct or cut off the switching circuit based on a result of the detection, wherein the detection circuit is configured such that, when the external driving signal is from a ballast and is being input to the LED tube lamp, the detection circuit conducts the switching circuit according to a state of a property of a detection signal transmitted through the first terminal and the second terminal, and wherein when the external driving signal is an AC signal from an electronic ballast and being input to the LED tube lamp, states of the property of current or voltage of the detection signal result in the detection circuit alternately conducting and cutting off the switching circuit.
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9. An LED tube lamp, comprising:
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a lamp tube, having a first external connection terminal at a first end of the lamp tube and a second external connection terminal at a second end of the lamp tube, for receiving an external driving signal; a rectifying circuit configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal; an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light, wherein the LED module comprises an LED unit; a current-limiting element for receiving the external driving signal, the current-limiting element coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit; and a ballast interface circuit coupled to the current-limiting element and having a first terminal and a second terminal, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a detection circuit and a switching circuit coupled to the detection circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast, and to conduct or cut off the switching circuit based on a result of the detection, and wherein the detection circuit is configured such that, when the external driving signal is from a ballast and is being input to the LED tube lamp, the detection circuit conducts the switching circuit according to a state of a property of a detection signal transmitted through the first terminal and the second terminal, wherein when the external driving signal is a relatively low frequency AC signal or DC signal from an emergency ballast for emergency lighting and being input to the LED tube lamp, states of the property of current or voltage of the detection signal result in transmission of the external driving signal through the ballast interface circuit and bypassing the current-limiting element.
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10. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube, having a first external connection terminal at a first end of the lamp tube and a second external connection terminal at a second end of the lamp tube, for receiving an external driving signal; a rectifying circuit configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal; an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light, wherein the LED module comprises an LED unit; a current-limiting element for receiving the external driving signal, the current-limiting element coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit; and a ballast interface circuit coupled to the current-limiting element and having a first terminal and a second terminal, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a control circuit and a switching circuit coupled to the control circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast according to a state of a property of the external driving signal or the rectified signal, and wherein when the external driving signal is substantially a DC signal being input to the LED tube lamp, the control circuit is configured to be charged by the external driving signal input through the first and second terminals, so as to eventually conduct the switching circuit, allowing transmission of the external driving signal through the ballast interface circuit and bypassing the current-limiting element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A light emitting diode (LED) tube lamp, comprising:
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a lamp tube, having a first external connection terminal at a first end of the lamp tube and a second external connection terminal at a second end of the lamp tube, the first and second external connection terminals for receiving an external driving signal; a rectifying circuit configured to rectify the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal; an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light, wherein the LED module comprises an LED unit; a current-limiting circuit for receiving the external driving signal, the current-limiting circuit coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit; and a ballast interface circuit coupled to the current-limiting circuit and having a first terminal and a second terminal, the ballast interface circuit causing the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a control circuit and a switching circuit coupled to the control circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast according to a state of a property of the external driving signal or the rectified signal, and wherein when the external driving signal is a direct current (DC) signal which is a substantially constant DC signal or a pulsating DC signal, the control circuit is configured to be charged by the external driving signal input through the first and second terminals, so as to eventually conduct the switching circuit, allowing transmission of the external driving signal through the ballast interface circuit and to the LED unit and thereby the LED tube lamp to emit light within a period of about 10 milliseconds (ms) to 300 ms upon the external driving signal being initially input to the LED tube lamp. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification