Led tube lamp

Patent metadata

Field	Value
Publication number	US-2016356472-A1
Application number	US-201615210989-A
Country	US
Kind code	A1
Filing date	Jul 15, 2016
Priority date	Sep 28, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

An 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 LED tube lamp includes an installation detection module configured in the LED tube lamp to detect an installation state between the LED tube lamp and the lamp socket. The installation detection module includes: a detection pulse generating module, configured to generate a first pulse signal; a detection result latching circuit, configured to receive and output the first pulse signal; a switch circuit, configured to receive the first pulse signal from the detection result latching circuit, and configured to maintain a conductive state of the switch circuit during the first pulse to cause a power loop of the LED tube lamp to be conductive; and a detection determining circuit, configured to detect a first sampling signal on the power loop so as to determine the installation state between the LED tube lamp and the lamp socket.

First claim

What is claimed is:

1 . An installation detection module configured in a light-emitting diode (LED) tube lamp to detect an installation state between the LED tube lamp and a lamp socket, the installation detection module comprising:
a detection pulse generating module, configured to generate a first pulse signal; a detection result latching circuit, configured to receive and output the first pulse signal; a switch circuit, configured to receive the first pulse signal from the detection result latching circuit, and configured to maintain a conductive state during the first pulse to cause a power loop of the LED tube lamp to be conductive; and a detection determining circuit, configured to detect a first sampling signal on the power loop so as to determine the installation state between the LED tube lamp and the lamp socket.

2 . The installation detection module according to claim 1 , wherein:
the detection determining circuit is configured to output a first high level signal when the detection determining circuit determines that the first sampling signal is greater than or equal to a predefined signal, the detection result latching circuit is configured to receive the first high level signal and is configured to output a second high level signal, and the switch circuit is configured to receive the second high level signal and is configured to maintain a conductive state of the switch circuit to cause the power loop to remain conductive.

3 . The installation detection module according to claim 1 , wherein:
the detection determining circuit is configured to output a first low level signal when the detection determining circuit determines that the first sampling signal is smaller than a predefined signal, the detection result latching circuit is configured to receive the first low level signal and is configured to output a second low level signal, the switch circuit is configured to receive the second low level signal and is configured to maintain an off state of the switch circuit to cause the power loop to remain open.

4 . The installation detection module according to claim 3 , wherein:
the detection pulse generating module is configured to generate a second pulse signal when the power loop remains open, the detection result latching circuit is configured to receive and output the second pulse signal, the switch circuit is configured to receive the second pulse signal from the detection result latching circuit, and is configured to change the off state to a conductive state during the second pulse to cause the power loop to be conductive once more, the detection determining circuit is configured to detect a second sampling signal on the power loop so as to determine the installation state between the LED tube lamp and the lamp socket.

5 . The installation detection module according to claim 4 , wherein:
the detection determining circuit is configured to output a first high level signal when the second sampling signal is greater than or equal to the predefined signal, the detection result latching circuit is configured to receive the first high level signal and is configured to output a second high level signal, the switch circuit is configured to receive the second high level signal and is configured to maintain a conductive state to cause the power loop to remain conductive.

6 . The installation detection module according to claim 4 , wherein:
the detection determining circuit is configured to output the first low level signal when the second sampling signal is smaller than the predefined signal, the detection result latching circuit is configured to receive the first low level signal and is configured to output the second low level signal, the switch circuit is configured to receive the second low level signal and is configured to maintain the off state to cause the power loop to remain open.

7 . The installation detection module according to claim 1 , wherein the detection pulse generating module comprises:
a first capacitor, one end connected to a driving signal; a first resistor, one end connected to the other end of the first capacitor, the other end of the first resistor grounded; a first buffer, having an input end and an output end, the input end connected to the other end of the first capacitor; a second capacitor, one end connected to the output end of the first buffer; a third capacitor, one end connected to the output end of the first buffer; a second resistor, one end connected to the driving signal, the other end of the second resistor connected to the other end of the second capacitor; a third resistor, one end connected to the other end of the third capacitor, the other end of the third resistor grounded; a first diode, having an anode and a cathode, the anode connected to the other end of the third resistor, the cathode connected to the one end of the third resistor that is not grounded; a first inverter, having an input end and an output end, the input end connected to the other end of the second capacitor; a second buffer, having an input end and an output end, the input end connected to the other end of the third capacitor; and a first OR gate, having a first input end, a second input end, and an output end, the first input end connected to the output end of the first inverter, the second input end connected to the output end of the second buffer, the output end of the first OR gate connected to the detection result latching circuit.

8 . The installation detection module according to claim 7 , wherein the first and the second buffers respectively comprise two inverters connected in series.

9 . The installation detection module according to claim 7 , wherein the detection result latching circuit comprises:
a first D flip-flop, having a data input end, a clock input end, and an output end, the data input end connected to the driving signal, the clock input end connected to the detection determining circuit; a fourth resistor, one end connected to the output end of the first D flip-flop, the other end of the fourth resistor grounded; and a second OR gate, having a first input end, a second input end, and an output end, the first input end connected to the output end of the first OR gate, the second input end connected to the output end of the first D flip-flop, the output end of the second OR gate connected to the switch circuit.

10 . The installation detection module according to claim 7 , wherein the switch circuit comprises:
a first transistor, having a base, a collector, and an emitter, the base connected to the output end of the second OR gate, the collector connected to one end of the power loop, the emitter connected to the detection determining circuit.

11 . The installation detection module according to claim 7 , wherein the detection determining circuit comprises:
a fifth resistor, one end connected to the emitter of the first transistor, the other end of the fifth resistor connected to the other end of the power loop; and a first comparator, having a first input end, a second input end, and an output end, the first input end connected to the predefined signal, the second input end connected to the one end of the fifth resistor, the output end of the first comparator connected to the clock input end of the first D flip-flop.

12 . The installation detection module according to claim 1 , wherein the detection pulse generating module comprises:
a sixth resistor, one end connected to a driving signal; a fourth capacitor, one end connected to the other end of the sixth resistor, the other end of the fourth capacitor grounded; a Schmitt trigger, having an input end and an outp

Assignees

• Jiaxing Super Lighting Electric Appliance Co Ltd

Inventors

• Liu Xintong
• Xiong Aiming
• Jiang Tao

Classifications

• F21V23/06

  the elements being coupling devices {, e.g. connectors} · CPC title

• H05B45/50

  responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits · CPC title

• F21V23/006

  the substrate being distinct from the light source holder · CPC title

• F21Y2103/10

  comprising a linear array of point-like light-generating elements · CPC title

• F21V23/023

  Power supplies in a casing (F21V23/003 takes precedence) · CPC title