# US 10,502,372 B2 · LED tube lamp

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,502,372 B2
- Document ID: US10502372B2
- Status: Granted
- Kind: B2
- Application number: 16/358,494
- Filed: 2019-03-19
- Published: 2019-08-08
- Granted: 2019-12-10
- Earliest claimed: 2015-03-10
- Assignees: Jiaxing Super Lighting Electric Appliance Co., Ltd
- Applicants: Jiaxing Super Lighting Electric Appliance Co., Ltd
- Inventors: Aiming Xiong; Xintong Liu
- Web page: https://patentgrep.com/patent/US10502372B2

## CPC

- F21K 9/278: Arrangement or mounting of circuit elements integrated in the light source
- F21K 9/27: Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
- F21K 9/272: Details of end parts, i.e. the parts that connect the light source to a fitting; Arrangement of components within end parts (F21K9/278 takes precedence)
- F21K 9/275: Details of bases or housings, i.e. the parts between the light-generating element and the end caps; Arrangement of components within bases or housings (F21K9/278 takes precedence)
- F21V 3/061: {the material being glass}
- F21V 15/015: Devices for covering joints between adjacent lighting devices; End coverings
- F21V 23/003: {the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array}
- F21V 23/005: {the substrate is supporting also the light source}
- F21V 23/023: {Power supplies in a casing (F21V23/003 takes precedence)}
- F21V 25/02: coming into action when lighting device is disturbed, dismounted, or broken
- F21V 29/70: characterised by passive heat-dissipating elements, e.g. heat-sinks
- H05B 45/375: using buck topology
- H05B 45/50: responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B 45/59: for reducing or suppressing flicker or glow effects
- H05K 1/00: Printed circuits
- H05K 3/363: {by soldering}
- F21V 23/02: the elements being transformers, impedances {or power supply units, e.g. a transformer with a rectifier}
- F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes
- F21Y 2103/10: comprising a linear array of point-like light-generating elements
- F21Y 2115/10: Light-emitting diodes [LED]
- H05B 45/325: Pulse-width modulation [PWM]
- H05B 45/34: Voltage stabilisation; Maintaining constant voltage
- H05B 45/36: Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
- H05B 45/38: using boost topology
- H05K 1/189: characterised by the use of flexible or folded printed circuits
- H05K 2201/10106: Light emitting diode [LED]
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A light-emitting diode (LED) tube lamp comprising a tube, end caps with contact pins and located on both ends of the tube, a first rectifying circuit and a second rectifying circuit and a filtering circuit that are coupled with the contact pins on the two end caps respectively, and a switch circuitry that is located between the rectifying circuits and the filtering circuit characterized in that the switch circuitry is capable of detecting whether the LED tube lamp is correctly installed on a lamp socket so as to reduce the risk of electric shock.

## Claims

### Claim 1

A light-emitting diode (LED) tube lamp comprising a tube, end caps with contact pins and located on both ends of the tube, a first rectifying circuit and a second rectifying circuit and a filtering circuit that are coupled with the contact pins on the two end caps respectively, and a switch circuitry that is located between the rectifying circuits and the filtering circuit characterized in that the switch circuitry comprises:
a first terminal that is coupled with either one or both of the contact pins,
a second terminal that is coupled to a ground terminal, and
a third terminal that is coupled with the filtering circuit;
wherein the switch circuitry further comprises a rectifying module, a reference voltage generating unit, a signal capturing unit, a signal processing unit and a transistor;
a source electrode and a drain electrode of the transistor are connected with the second terminal and the third terminal of the switch circuitry, respectively;
at least one of the first and the second rectifying circuits served as the rectifying module of the switch circuitry to receive an external driving signal via the first terminal and to output a driving voltage to the reference voltage generating unit;
the signal capturing unit is used to sample an electric signal passing through the second terminal and the third terminal of the switch circuitry; the signal capturing unit is further used to compare the sampled electric signal and a reference signal outputted by the reference voltage generating unit and output a detection result signal; the signal processing unit receives the detection result signal and comprises a driver to output a control signal with high-low level to a gate electrode of the transistor,
wherein when the contact pin on either end of the LED tube lamp is connected to the external driving signal, if the electric signal sampled by the signal capturing unit is lower than a set value, the switch circuitry will be disconnected; if the electric signal sampled by the signal capturing unit equal to or higher than the set value, the switch circuitry will be connected.

### Claim 2 (depends on 1)

The LED tube lamp according to claim 1, wherein the reference voltage generating unit, the signal capturing unit, the signal processing unit and the transistor of the switch circuitry forms a three-terminal switch device having a power terminal, a first switching terminal and a second switching terminal.

### Claim 3 (depends on 2)

The LED tube lamp according to claim 2, wherein the power terminal is connected to the output of the rectifying module for receiving the driving voltage, the first switching terminal is connected to a rectifying output terminal via the second terminal, and the second switching terminal is connected to the filtering circuit via the third terminal.

### Claim 4 (depends on 1)

The LED tube lamp according to claim 1, wherein the set value is 1.25V.

### Claim 5 (depends on 1)

The LED tube lamp according to claim 1, wherein the signal capturing unit comprises:
an OR gate, having a first input end, a second input end, and an output end connected to the signal processing unit;
a first comparator, having a first input end connected to one end of the transistor, a second input end receiving a first reference signal, and an output end connected to the first input end of the OR gate; and
a second comparator, having a first input end connected to a second reference signal, a second input end connected to the first input end of the first comparator, and an output end connected to the second input end of the OR gate.

### Claim 6 (depends on 1)

The LED tube lamp according to claim 1, wherein the at least one of the first and the second rectifying circuit is a full-wave bridge rectifying circuit.

### Claim 7 (depends on 1)

The LED tube lamp according to claim 1, wherein the at least one of the first and the second rectifying circuit is a half-wave bridge rectifying circuit.

### Claim 8 (depends on 1)

The LED tube lamp according to claim 1, wherein the level of the electric signal sampled by the signal capturing unit is related to an additional impedance connected to the LED tube lamp.

### Claim 9 (depends on 1)

The LED tube lamp according to claim 1, wherein when the electric signal corresponding to an additional 500 ohm, which is used to emulate the conductive resistance of human body in transient response, is detected by the signal capturing unit, the electric signal sampled by the signal capturing unit is lower than the set value.

### Claim 10 (depends on 2)

The LED tube lamp according to claim 2, wherein the three-terminal switch device further comprises a signal generating unit configured to generate a pulse signal.

### Claim 11 (depends on 10)

The LED tube lamp according to claim 10, wherein the signal processing unit further comprises:
an OR gate, having a first input end connected to the signal generating unit, a second input end, and an output end connected to an input end of the driver; and
a latch circuit, having a first input end for receiving a driving voltage, a second input end connected to the signal capturing unit, and an output connected to the second input end of the OR gate.

### Claim 12 (depends on 11)

The LED tube lamp according to claim 11, wherein the latch circuit comprises a D flip-flop, the first input end of the latch circuit is a data input end of the D flip-flop, and the second input end of the latch circuit is a clock input end of the D flip-flop.

### Claim 13 (depends on 10)

The LED tube lamp according to claim 10, wherein if the electric signal sampled by the signal capturing unit is lower than the set value, the signal processing unit outputs the pulse signal to the transistor and causes the switch circuitry will only be connected during a pulse-on time of the pulse signal.

### Claim 14 (depends on 13)

The LED tube lamp according to claim 13, wherein the pulse-on time of each pulse is between 10 microseconds to 1 millisecond.

### Claim 15

A LED straight tube lamp comprising a tube, lamp caps with contact pins and located on both ends of the tube, a first rectifying unit and a second rectifying unit and a filter unit that are coupled with the pins on the two end caps respectively, and a switch unit that is located between the rectifying units and the filter unit characterized in that the switch unit comprises:
a sampling end that is coupled with either one or both of the contact pins,
a first end that is earthed, and
a second end that is coupled with the filter unit;
wherein the switch unit further comprises a rectifying module, a reference module, an impedance detecting module, a control module, a driver module and a transistor;
a source electrode and a drain electrode of the transistor are connected with the first end and second end of the switch unit, respectively;
the sampling end outputs sampling signal to the rectifying module, which outputs rectified sampling signal to the reference module;
the impedance detecting module is used to detect the current on the switch unit's first end; the control module is used to compare the current detected by the impedance detecting module and the current outputted by the reference module and output control signal to the driver module; the driver module outputs high-low level signal to the gate of the transistor, and
wherein when the contact pin on either end of the LED straight tube lamp is connected to a power supply, if the current detected by the impedance detecting module is lower than a set value, the switch unit will be disconnected; if current detected by the impedance detecting module equal to or higher than the set value, the switch unit will be connected.

### Claim 16 (depends on 15)

The LED straight tube lamp described in claim 15, wherein the rectifying module described is a semi-wave rectifying module.

### Claim 17 (depends on 15)

The LED straight tube lamp described in claim 15, wherein an impedance detected by the impedance detecting module is 500˜1500 Ohm.

### Claim 18 (depends on 17)

The LED straight tube lamp according to claim 17, wherein an impedance detected by the impedance detecting module is 500 Ohm configured to emulate the conductive resistance of human body in transient response.

### Claim 19 (depends on 15)

The LED straight tube lamp according to claim 15, wherein the rectifying module comprises one of the first rectifying unit and the second rectifying unit.