LED tube lamp
First Claim
1. A ballast-bypass type light-emitting diode (LED) tube lamp, comprising:
- a lamp tube;
two end caps, each having an external connection terminal, and each coupled to a respective end of the lamp tube, wherein the external connection terminals are configured to receive an external driving signal having a frequency of 50 Hz or 60 Hz;
an LED module, disposed in the lamp tube; and
a power supply module, configured to provide a DC driving signal to the LED module according to the external driving signal, wherein the power supply module comprises;
a rectifying circuit, coupled to the external connection terminals, for rectifying the external driving signal to produce a rectified signal;
a filtering circuit, coupled to the rectifying circuit, for filtering the rectified signal to produce a filtered signal;
a driving circuit, coupled to the filtering circuit, for converting the filtered signal into the DC driving signal; and
a detection module, having a first detection terminal coupled to the rectifying circuit and a second detection terminal coupled to the filtering circuit,wherein the detection module temporarily conducts to cause the first and the second detection terminals to be conductive during a detection stage, so that a pulse current is generated when the LED tube lamp is powered on;
wherein the detection module performs a detection based on the pulse current, so as to determine whether to conduct or cut off the current path between the first and the second detection terminals after the detection stage; and
wherein the rectifying circuit comprises;
a first diode, having an anode connected to the first detection terminal, and a cathode connected to one of the external connection terminals;
a second diode, having an anode connected to the first detection terminal, and a cathode connected to another one of the external connection terminals;
a third diode, having an anode connected to the one of the external connection terminals, and a cathode connected to the filtering circuit; and
a fourth diode, having an anode connected to the another one of the external connection terminals, and a cathode connected to the cathode of the third diode.
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Accused Products
Abstract
A ballast-bypass type LED tube lamp is provided herein, which implements the safety function for protecting the user from electric shock since it conducts only when both ends thereof have been correctly installed into a lamp socket. The ballast-bypass type LED tube lamp includes a lamp tube, two end caps, an LED module and a power supply module. The power supply module includes a detection module for temporarily conducting two detection terminals of the detection module during a detection stage, so that a pulse current is generated when the LED tube lamp is powered on. The detection module performs a detection based on the pulse current, so as to determine whether to conduct or cut off a current path between the first and the second detection terminals after the detection stage.
81 Citations
17 Claims
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1. A ballast-bypass type light-emitting diode (LED) tube lamp, comprising:
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a lamp tube; two end caps, each having an external connection terminal, and each coupled to a respective end of the lamp tube, wherein the external connection terminals are configured to receive an external driving signal having a frequency of 50 Hz or 60 Hz; an LED module, disposed in the lamp tube; and a power supply module, configured to provide a DC driving signal to the LED module according to the external driving signal, wherein the power supply module comprises; a rectifying circuit, coupled to the external connection terminals, for rectifying the external driving signal to produce a rectified signal; a filtering circuit, coupled to the rectifying circuit, for filtering the rectified signal to produce a filtered signal; a driving circuit, coupled to the filtering circuit, for converting the filtered signal into the DC driving signal; and a detection module, having a first detection terminal coupled to the rectifying circuit and a second detection terminal coupled to the filtering circuit, wherein the detection module temporarily conducts to cause the first and the second detection terminals to be conductive during a detection stage, so that a pulse current is generated when the LED tube lamp is powered on; wherein the detection module performs a detection based on the pulse current, so as to determine whether to conduct or cut off the current path between the first and the second detection terminals after the detection stage; and wherein the rectifying circuit comprises; a first diode, having an anode connected to the first detection terminal, and a cathode connected to one of the external connection terminals; a second diode, having an anode connected to the first detection terminal, and a cathode connected to another one of the external connection terminals; a third diode, having an anode connected to the one of the external connection terminals, and a cathode connected to the filtering circuit; and a fourth diode, having an anode connected to the another one of the external connection terminals, and a cathode connected to the cathode of the third diode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A power supply module for supplying power to an LED module, the power supply module comprising:
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a rectifying circuit, having two input terminals for receiving an input signal and configured to rectify the input signal to produce a rectified signal; a filtering circuit, coupled to the rectifying circuit, for filtering the rectified signal to produce a filtered signal; a driving circuit, coupled to the filtering circuit, for converting the filtered signal into a DC driving signal; and a detection module, having a first detection terminal coupled to the rectifying circuit and a second detection terminal coupled to the filtering circuit, wherein a leakage loop conducts when one of the input terminals receives the input signal and the other one of the input terminals is connected to ground via a resistive object, wherein a pulse current is detected by the detection module when the leakage loop is conducted, and wherein the rectifying circuit comprises; a first diode, having an anode connected to the first detection terminal, and a cathode connected to one of the input terminals; a second diode, having an anode connected to the first detection terminal, and a cathode connected to another one of the input terminals; a third diode, having an anode connected to the one of the input terminals, and a cathode connected to the filtering circuit; and a fourth diode, having an anode connected to the another one of the input terminals, and a cathode connected to the cathode of the third diode. - View Dependent Claims (15, 16, 17)
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Specification