LED tube lamp compatible with different sources of external driving signal
First Claim
1. An LED tube lamp, comprising:
- a lamp tube having a first pin and a second pin at a first end of the lamp tube and a third pin and a fourth pin at a second end of the lamp tube, for receiving an external driving signal;
a light strip disposed in the lamp tube, comprising an LED module for emitting light;
a driving circuit configured to drive the LED module;
a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit comprising a first rectifying circuit and a second rectifying circuit, and the first rectifying circuit and the second rectifying circuit each comprising four diodes, wherein a common cathode of two diodes of the first rectifying circuit is coupled to a common cathode of two diodes of the second rectifying circuit, and a common anode of the other two diodes of the first rectifying circuit is coupled to a common anode of the other two diodes of the second rectifying circuit;
a filtering circuit coupled to the rectifying circuit and the driving circuit, for filtering the rectified signal in order to drive the LED module;
a first capacitor coupled between the first pin and the second pin;
a second capacitor coupled between the third pin and the fourth pin;
a first current-limiting element for receiving the external driving signal input at one or more of the pins from a lamp driving circuit, the first current-limiting element coupled between the second pin and the third pin, and coupled to the first rectifying circuit; and
a second current-limiting element coupled between the first pin and the fourth pin; and
a ballast detection circuit coupled to or in the first rectifying circuit, or coupled to or in the second rectifying circuit,wherein the ballast detection circuit comprises a detection circuit and a mode switching circuit;
the detection circuit is configured to generate a control signal according to the frequency of the external driving signal, to control the mode switching circuit on whether to perform a first driving mode or a second driving mode;
when the mode switching circuit determines on performing the first driving mode, the driving circuit receives a filtered signal from the filtering circuit to drive the LED module; and
when the mode switching circuit determines on performing the second driving mode, the received external driving signal or the filtered signal in the LED tube lamp is transmitted to reach the LED module by bypassing at least some components of the driving circuit.
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Accused Products
Abstract
An LED tube lamp is provided. The LED tube lamp includes a lamp tube including a first pin at a first end of the lamp tube and a second pin at a second end of the lamp tube, for receiving an external driving signal; a light strip disposed in the lamp tube, comprising an LED module for emitting light; a driving circuit configured to drive the LED module; a rectifying circuit for rectifying the external driving signal to produce a rectified signal; a filtering circuit coupled to the rectifying circuit, for filtering the rectified signal in order to drive the LED module; a first capacitor coupled to the first pin at the first end of the lamp tube; and a second capacitor coupled to the second pin at the second end of the lamp tube.
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Citations
30 Claims
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1. An LED tube lamp, comprising:
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a lamp tube having a first pin and a second pin at a first end of the lamp tube and a third pin and a fourth pin at a second end of the lamp tube, for receiving an external driving signal; a light strip disposed in the lamp tube, comprising an LED module for emitting light; a driving circuit configured to drive the LED module; a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit comprising a first rectifying circuit and a second rectifying circuit, and the first rectifying circuit and the second rectifying circuit each comprising four diodes, wherein a common cathode of two diodes of the first rectifying circuit is coupled to a common cathode of two diodes of the second rectifying circuit, and a common anode of the other two diodes of the first rectifying circuit is coupled to a common anode of the other two diodes of the second rectifying circuit; a filtering circuit coupled to the rectifying circuit and the driving circuit, for filtering the rectified signal in order to drive the LED module; a first capacitor coupled between the first pin and the second pin; a second capacitor coupled between the third pin and the fourth pin; a first current-limiting element for receiving the external driving signal input at one or more of the pins from a lamp driving circuit, the first current-limiting element coupled between the second pin and the third pin, and coupled to the first rectifying circuit; and a second current-limiting element coupled between the first pin and the fourth pin; and
a ballast detection circuit coupled to or in the first rectifying circuit, or coupled to or in the second rectifying circuit,wherein the ballast detection circuit comprises a detection circuit and a mode switching circuit;
the detection circuit is configured to generate a control signal according to the frequency of the external driving signal, to control the mode switching circuit on whether to perform a first driving mode or a second driving mode;
when the mode switching circuit determines on performing the first driving mode, the driving circuit receives a filtered signal from the filtering circuit to drive the LED module; and
when the mode switching circuit determines on performing the second driving mode, the received external driving signal or the filtered signal in the LED tube lamp is transmitted to reach the LED module by bypassing at least some components of the driving circuit. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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7. An LED tube lamp, comprising:
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a lamp tube having a first pin and a second pin at a first end of the lamp tube and a third pin and a fourth pin at a second end of the lamp tube, for receiving an external driving signal; a light strip disposed in the lamp tube, comprising an LED module for emitting light; a driving circuit configured to drive the LED module; a rectifying circuit for rectifying the external driving signal to produce a rectified signal, the rectifying circuit comprising a first rectifying circuit and a second rectifying circuit, and the first rectifying circuit and the second rectifying circuit each comprising four diodes, wherein a common cathode of two diodes of the first rectifying circuit is coupled to a common cathode of two diodes of the second rectifying circuit, and a common anode of the other two diodes of the first rectifying circuit is coupled to a common anode of the other two diodes of the second rectifying circuit; a filtering circuit coupled to the rectifying circuit and the driving circuit, for filtering the rectified signal in order to drive the LED module; a first capacitor coupled between the first pin and the second pin; a second capacitor coupled between the third pin and the fourth pin; a first current-limiting element for receiving the external driving signal input at one or more of the pins from a lamp driving circuit, the first current-limiting element coupled between the second pin and the third pin, and coupled to the first rectifying circuit; a second current-limiting element coupled between the first pin and the fourth pin; and a ballast detection circuit coupled to or in the first rectifying circuit, or coupled to or in the second rectifying circuit, wherein the ballast detection circuit comprises a detection circuit and a switch circuit;
the detection circuit is configured to determine whether the external driving signal is a high frequency signal according to the frequency of the external driving signal;
when the external driving signal is determined to be a high frequency signal, the switch circuit is configured to be turned off, to allow the external driving signal to flow through a circuit connected in parallel with the switch circuit or an external circuit outside the ballast detection circuit; and
when the external driving signal is determined to be a low frequency signal, the switch circuit is configured to be turned on to allow transmission of the external driving signal bypassing the circuit connected in parallel with the switch circuit, or the external circuit.
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18. An LED tube lamp, comprising:
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a lamp tube having a first pin at a first end of the lamp tube and a second pin at a second end of the lamp tube, for receiving an external driving signal; a light strip disposed in the lamp tube, comprising an LED module for emitting light; a driving circuit configured to drive the LED module; a rectifying circuit for rectifying the external driving signal to produce a rectified signal;
a filtering circuit coupled to the rectifying circuit, for filtering the rectified signal in order to drive the LED module;a first capacitor coupled to the first pin at the first end of the lamp tube; a second capacitor coupled to the second pin at the second end of the lamp tube; and a ballast detection circuit coupled to or in the rectifying circuit, wherein the ballast detection circuit comprises a detection circuit and a mode switching circuit;
the detection circuit is configured to generate a control signal according to the frequency of the external driving signal, to control the mode switching circuit on whether to perform a first driving mode or a second driving mode;
when the mode switching circuit determines on performing the first driving mode, the driving circuit receives a filtered signal from the filtering circuit to drive the LED module; and
when the mode switching circuit determines on performing the second driving mode, the received external driving signal or the filtered signal in the LED tube lamp is transmitted to reach the LED module by bypassing at least some components of the driving circuit. - View Dependent Claims (19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30)
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22. An LED tube lamp, comprising:
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a lamp tube having a first pin at a first end of the lamp tube and a second pin at a second end of the lamp tube, for receiving an external driving signal; a light strip disposed in the lamp tube, comprising an LED module for emitting light; a driving circuit configured to drive the LED module; a rectifying circuit for rectifying the external driving signal to produce a rectified signal;
a filtering circuit coupled to the rectifying circuit, for filtering the rectified signal in order to drive the LED module;a first capacitor coupled to the first pin at the first end of the lamp tube; a second capacitor coupled to the second pin at the second end of the lamp tube; and a ballast detection circuit coupled to or in the rectifying circuit, wherein the ballast detection circuit comprises a detection circuit and a switch circuit;
the detection circuit is configured to determine whether the external driving signal is a high frequency signal according to the frequency of the external driving signal;
when the external driving signal is determined to be a high frequency signal, the switch circuit is turned off, allowing the external driving signal to flow through a circuit connected in parallel with the switch circuit or an external circuit outside the ballast detection circuit; and
when the external driving signal is determined to be a low frequency signal the switch circuit is turned on to allow transmission of the external driving signal bypassing the circuit connected in parallel with the switch circuit, or the external circuit.
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Specification