LED tube lamp
First Claim
1. A ballast by-pass light-emitting diode (LED) tube lamp having at least a first and second external connection terminal each connected to an opposite side of the ballast by-pass LED tube lamp, comprising:
- a driving circuit, electrically connected to the first and second external connection terminals for receiving an external driving signal and configured to convert the external driving signal into a lamp driving signal, wherein the external driving signal has a frequency substantially equal to 50 Hz or 60 Hz;
an LED module, electrically connected to the driving circuit, for receiving the lamp driving signal;
a current limiting circuit, electrically connected between the at least one of the first and second external connection terminals and the LED module, and configured to limit a current flowing through the external connection terminals and the LED module to less than a predetermined value when being enabled and conduct a current above the predetermined value when being disabled; and
an electric shock detection circuit, configured to temporarily turn on a detection path of the ballast by-pass LED tube lamp for 10 μ
s to 30 μ
s and detect an equivalent impedance of the detection path being turned on,wherein the electric shock detection circuit controls the enable/disable state of the current limiting circuit according to the equivalent impedance.
1 Assignment
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Accused Products
Abstract
An LED tube lamp is disclosed. An installation detection circuit is configured in the LED tube lamp configured to receive an external driving signal. The installation detection circuit is configured to detect during one or more pulse signals whether the LED tube lamp is properly installed on a lamp socket, based on detecting a signal generated from the external driving signal. The installation detection circuit includes a switch circuit coupled to the pulse generating circuit, wherein the one or more pulse signals control turning on and off of the switch circuit. The installation detection circuit is further configured to: when it is detected during one or more pulse signals that the LED tube lamp is not properly installed on the lamp socket, control the switch circuit to remain in an off state to cause a power loop of the LED tube lamp to be open; and when it is detected during one or more pulse signals that the LED tube lamp is properly installed on the lamp socket, control the switch circuit to remain in a conducting state to cause the power loop of the LED tube lamp to maintain a conducting state.
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Citations
25 Claims
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1. A ballast by-pass light-emitting diode (LED) tube lamp having at least a first and second external connection terminal each connected to an opposite side of the ballast by-pass LED tube lamp, comprising:
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a driving circuit, electrically connected to the first and second external connection terminals for receiving an external driving signal and configured to convert the external driving signal into a lamp driving signal, wherein the external driving signal has a frequency substantially equal to 50 Hz or 60 Hz; an LED module, electrically connected to the driving circuit, for receiving the lamp driving signal; a current limiting circuit, electrically connected between the at least one of the first and second external connection terminals and the LED module, and configured to limit a current flowing through the external connection terminals and the LED module to less than a predetermined value when being enabled and conduct a current above the predetermined value when being disabled; and an electric shock detection circuit, configured to temporarily turn on a detection path of the ballast by-pass LED tube lamp for 10 μ
s to 30 μ
s and detect an equivalent impedance of the detection path being turned on,wherein the electric shock detection circuit controls the enable/disable state of the current limiting circuit according to the equivalent impedance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A ballast by-pass light-emitting diode (LED) tube lamp, comprising:
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a lamp tube; two end caps, respectively disposed on opposite sides of the lamp tube, wherein each end cap has an external connection terminal for receiving an external driving signal having a frequency substantially equal to 50 Hz or 60 Hz; a power supply module, electrically connected to the external connection terminals and configured to generate a lamp driving signal based on the external driving signal; and an LED module, disposed in the lamp tube and electrically connected to the power supply module, for receiving the lamp driving signal, wherein the power supply module comprises; a current limiting circuit, electrically connected between at least one of the external connection terminals and the LED module, and configured to limit a current flowing through the external connection terminals and the LED module to less than a predetermined value when being enabled and to conduct a current above the predetermined value when being disabled; and an electric shock detection circuit, configured to detect a signal on a detection path of the ballast by-pass LED tube lamp and control the enable/disable state of the current limiting circuit according to a detection result, wherein at least some electronic components of the power supply module are connected via a power circuit board, and the power circuit board is disposed in at least one of the end caps parallel to an axial direction of the lamp tube. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A DC-to-DC power converter with leakage current protection, wherein the DC-to-DC power converter has an input side and an output side and comprises:
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a constant current controller, configured to generate a lighting control signal having a pulse waveform; a power switch, electrically connected to the constant current controller and configured to be switched according to the lighting control signal; a conversion circuit, electrically connected to the power switch and configured to absorb and release power received from the input side in response to the switching state of the power switch so as to generate a driving signal at the output side; a feedback circuit, configured to generate a feedback signal by sampling a signal on at least one of the input side and the output side and to transmit the feedback signal to the constant current controller; and a detection circuit, electrically connected to the constant current controller and the input side and configured to detect a signal at the input side and generate an installation detection signal, wherein; under an installation detection mode, the constant current controller outputs the lighting control signal with at least one first pulse and determines whether to enter a normal driving mode according to the installation detection signal; and under the normal driving mode, the constant current controller outputs the lighting control signal with a plurality of second pulses and modulates the second pulses according to the feedback signal. - View Dependent Claims (25)
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Specification