WO2019190757A1 - An electric shock protection circuit for an led tube and method for same - Google Patents

An electric shock protection circuit for an led tube and method for same Download PDF

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Publication number
WO2019190757A1
WO2019190757A1 PCT/US2019/022177 US2019022177W WO2019190757A1 WO 2019190757 A1 WO2019190757 A1 WO 2019190757A1 US 2019022177 W US2019022177 W US 2019022177W WO 2019190757 A1 WO2019190757 A1 WO 2019190757A1
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WO
WIPO (PCT)
Prior art keywords
terminal
voltage
led tube
control module
output
Prior art date
Application number
PCT/US2019/022177
Other languages
French (fr)
Inventor
Zhichao LIU
Original Assignee
GE Lighting Solutions, LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GE Lighting Solutions, LLC filed Critical GE Lighting Solutions, LLC
Publication of WO2019190757A1 publication Critical patent/WO2019190757A1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/26—Circuit arrangements for protecting against earth faults
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention generally relates to the field of illumination, and in particular to an electric shock protection circuit for an LED tube and method for same.
  • LED Light-emitting diode
  • a method of not removing the ballast is usually adopted, while a driving circuit is added to the LED control circuit to be compatible with the ballast, such that the LED tube can work as normal.
  • a driving circuit is added to the LED control circuit to be compatible with the ballast, such that the LED tube can work as normal.
  • the electric shock protection circuit for the LED tube comprises a trigger module, a first control module and a second control module.
  • the trigger module is connected to a rectifying circuit of the LED tube and configured to output a trigger signal based on a rectified voltage.
  • the first control module comprises a first input terminal, a second input terminal, a third input terminal and an output terminal.
  • the first input terminal of the first control module is connected to the trigger module, the second input terminal and the third input terminal are connected to two terminals of the rectifying circuit, and the first control module is configured to work based on the trigger signal and output a reference voltage via the output terminal based on the rectified voltage.
  • the second control module is connected to the output terminal of the first control module and configured to control the LED tube based on the reference voltage.
  • the present invention also discloses an electric shock protection method for an LED tube.
  • the electric shock protection method for the LED tube comprises outputting a trigger signal based on a rectified voltage of a rectifying circuit of the LED tube; outputting a reference voltage based on the trigger signal and the rectified voltage; outputting a logic control signal based on the reference voltage; and controlling the LED tube based on the logic control signal.
  • FIG. l is a general schematic block diagram of an electric shock protection circuit of an LED lamp according to an embodiment of the present invention.
  • FIG. 3 is a flow chart of an electric shock protection method for an LED lamp according to an embodiment of the present invention.
  • FIG. 1 shows a general schematic block diagram of an electric shock protection circuit 100 of an LED tube according to one embodiment of the present invention.
  • the electric shock protection circuit 100 is connected to the rectifier circuit 10 of the LED tube and the inverter 20 of the LED tube, respectively.
  • the electric shock protection circuit 100 comprises a trigger module 110, a first control module 120, and a second control module 130.
  • the trigger module 110 is connected to the rectifier circuit 10 for outputting a trigger signal based on the rectified voltage of the rectifier circuit 10.
  • the trigger signal is a rectangular wave.
  • the trigger module 110 is configured with a first threshold; when the rectified voltage of the rectifier circuit 10 is greater than or equal to the first threshold, the trigger signal output by the trigger module is a high level signal; when the rectified voltage is lower than the first threshold, The trigger signal output by the trigger module is a low level signal.
  • the duration of the high level signal among different trigger signals can be configured by selecting a different first threshold.
  • the first control module 120 is coupled to the trigger module 110 for outputting the reference voltage VREF.
  • FIG. 2 shows a schematic circuit diagram of a first control module 120 of an electric shock protection circuit 100 of an LED lamp according to a specific embodiment of the present invention.
  • the first control module 120 comprises a first input terminal 125, a second input terminal 126, a third input terminal 127, and an output terminal 128.
  • the first input terminal 125 of the first control module 120 is connected to the trigger module 110, the second input terminal 126 and the third input terminal 127 are connected to two terminals of the rectifying circuit 10, the output terminal 128 is connected to the second control module 130.
  • the first control module 120 comprises a first impedance element 121, a second impedance element 122, a switch element 123, and a reference source module 124.
  • One terminal of the first impedance element 121 is as the first input terminal 125, the other terminal of the first impedance element 121 is connected with a first terminal Ti of the switch element 123 and a first terminal T 4 of the reference source module 124 respectively, a second terminal T 2 of the switch element is configured as the second input terminal 126, the second impedance element 122 is connected between a second terminal T5 and a third terminal Tb of the reference source module 124, a third terminal T3 of the switch element 123 is connected to the third terminal Tb of the reference source module 124, while the second terminal T5 and the third terminal Tb of the reference source module 124 are configured as the third input terminal 127 and the output terminal 128 respectively.
  • the switch element 123 may be an Insulated Gate Bipolar Transistor (IGBT) or a Metal Oxide Semiconductor Field Effect Transistor (MOSFET).
  • IGBT Insulated Gate Bipolar Transistor
  • MOSFET Metal Oxide Semiconductor Field Effect Transistor
  • the switch element 123 is described by taking a MOSFET as an example; the gate G of the MOSFET is the first terminal Ti of the switch element 123, the drain D is the second terminal T2 of the switch element 123, and the source S is the third terminal T3 of the switch element 123; when the voltage between the gate G and the source S of the MOSFET is higher than a certain threshold, the MOSFET is turned on, that is, the second terminal T2 of the switch element 123 is electrically connected to the third terminal T3, and the first control module 120 operates.
  • a high level signal in the trigger signal can control the MOSFET to turn on, and a low level signal can control the MOSFET to turn off.
  • the reference source module 124 comprises a controllable precision regulated source.
  • the cathode of the controllable precision regulated source is the fist terminal T4 of the reference source module 124
  • the anode is the second terminal T5 of the reference source module 124
  • the reference terminal is the third terminal Tb of the reference source module 124.
  • the reference source module 124 can define the voltage at the third terminal Tb to be a constant value, for example, 2.5V.
  • the reference source module 124 can output a constant current value.
  • the reference source module 124 comprises a series of transistors and a Zener diode; in one embodiment, the transistor comprises an NPN transistor, wherein the base B of the transistor is the first terminal T4 of the reference source module 124, the emitter E is connected to the cathode of the Zener diode, the anode of the Zener diode is the second terminal T5 of the reference source module 124, and the collector C of the transistor is the third terminal Tb of the reference source module 124.
  • the reference source module 124 can define the voltage at the third terminal Tb to be a constant value, for example, 2.5V. In another embodiment, by setting the resistance of the second impedance element 122, the reference source module 124 can output a constant current value.
  • the trigger signal output by the trigger module 110 is a high level signal
  • the voltage of the first terminal Ti of the switch element 123 is higher than the voltage of the third terminal T3, so that it is conducting between the second terminal T2 and the third terminal T3, the switch element 123 is turned on, and the first control module 120 operates.
  • the switch element 123 is turned on, the voltage of the third terminal T3 is low, for example, less than 2.5V, that is, the voltage of the third terminal Tb of the reference source module 124 is less than 2.5 V, and the voltage of the first terminal T4 of the reference source module 124 is at a high level, the current flowing through the second impedance element 122 increases, and the voltage at the output terminal 128 increases.
  • the resistance of the second impedance element 122 is set to 25 ohms, that is, when the current flowing through the second impedance element 122 reaches 100 milliamps, the voltage at the output terminal 128 reaches 2.5 volts.
  • the voltage at the output terminal 128 is equal to 2.5 V, that is, when the voltage at the third terminal Tb of the reference source module 124 reaches 2.5 V, the current flowing through the second impedance element 122 does not change, and the voltage at the output terminal 128 is maintained at 2.5 V. That is, when no one touches one end of the LED tube, the first control module 120 outputs the second voltage as a reference voltage.
  • the second voltage is equal to 2.5V.
  • the body resistance is connected in series with the second impedance element 122; when the trigger signal output by the trigger module 110 is a high level signal, the third terminal T3 of the switch element 123 is turned on; the voltage is lower, for example, less than 2.5V, that is, the voltage of the third terminal Tb of the reference source module 124 is less than 2.5V, and the voltage of the first terminal T4 of the reference source module 124 is at a high level, the current flowing through the second impedance element 122 and the body resistance increases; however, resistance of the human body is large, for example, between 500 ohms and 2,000 ohms, and the current flowing through the second impedance element and the resistance of the human body cannot reach 100 mA, which means that the voltage at the output terminal 128 does not reach 2.5V. That is, when a person touches one end of the LED tube, the first control module 120 outputs the first voltage as a reference voltage. In one embodiment, the first voltage is less than
  • the second control module 130 is coupled to the output terminal 128 of the first control module 120 for controlling the operation of the LED lamp based on the reference voltage VREF output by the first control module 120; in one embodiment, the second control module 130 can output a logic control signal to control the converter 20 of the LED tube.
  • the second control module 130 has a second threshold; when the reference voltage VREF output by the first control module 120 is less than the second threshold, the second control module 130 outputs a first logic control signal to control the LED tube to be inoperative; when the reference voltage VREF is not less than the second threshold, the second control module 130 outputs a second logic control signal to control the LED tube to operate normally.
  • the second threshold of the second control module 130 is not less than the second voltage output by the first control module 120; when the first control module 120 outputs the first voltage, the first voltage is less than the second threshold, and the second control module 130 outputs a first logic control signal to control the LED lamp to be inoperative; when the first control module 120 outputs the second voltage, the second control module 130 outputs a second logic control signal to control the LED lamp to operate normally.
  • FIG. 3 illustrates a flow chart of an electric shock protection method 200 for an LED lamp according to an embodiment of the present invention.
  • the electric shock protection method 200 of the LED tube comprises the following steps.
  • a trigger signal is output based on the rectified voltage of the rectifier circuit of the LED lamp.
  • the output trigger signal when the rectified voltage of the rectifying circuit is greater than or equal to the first threshold, the output trigger signal is a high level signal, and when the rectified voltage is less than the first threshold, the output trigger signal is a low level signal, wherein the high level signal duration of the trigger signal can be controlled by setting a first threshold.
  • the reference voltage is output based on the trigger signal and the rectified voltage.
  • the first voltage is output based on the trigger signal and the rectified voltage
  • the second voltage is output, wherein the second voltage is greater than the first voltage.
  • a logic control signal is output based on the reference voltage.
  • the first logic signal is output when the reference voltage is less than the second threshold
  • the second logic signal is output when the reference voltage is not less than the second threshold.
  • the second threshold is not less than the second voltage.
  • step 240 the LED tube is controlled based on the logic signal.
  • the LED tube is controlled to be inoperative based on the first logic signal, and the LED tube is controlled to operate normally based on the second logic signal.

Abstract

The present invention discloses an electric shock protection circuit for an LED tube, which comprises a trigger module, a first control module and a second control module. The trigger module is connected to a rectifying circuit of the LED tube and configured to output a trigger signal based on a rectified voltage. The first control module comprises a first input terminal, a second input terminal, a third input terminal and an output terminal. The first input terminal is connected to the trigger module, the second input terminal and the third input terminal are connected to two terminals of the rectifying circuit, and the first control module is configured to work based on the trigger signal and output a reference voltage via the output terminal based on the rectified voltage. The second control module is connected to the output terminal of the first control module and configured to control the LED tube based on the reference voltage. The present invention also discloses an electric shock protection method for an LED tube.

Description

AN ELECTRIC SHOCK PROTECTION CIRCUIT FOR AN LED TUBE AND METHOD FOR
SAME
TECHNICAL FIELD
[0001] The present invention generally relates to the field of illumination, and in particular to an electric shock protection circuit for an LED tube and method for same.
BACKGROUND
[0002] Light-emitting diode (LED) has received extensive attention and is widely used due to its small size, brightness, low power consumption and long service life. It has become a trend to replace the traditional fluorescent tube with LED tube. In prior art, the LED tube is replaced by a conventional fluorescent tube, a method of not removing the ballast is usually adopted, while a driving circuit is added to the LED control circuit to be compatible with the ballast, such that the LED tube can work as normal. When adopting the method of removing the ballast, during installation, removal of the ballast or reparation of the LED tube, when a person touches one end of the LED tube, a circuit is formed between the mains, the human body and the earth, and there is a danger of electric shock.
[0003] Therefore, in view of this, how to carry out electric shock protection becomes more and more urgent.
SUMMARY
[0004] One aspect of the present invention provides an electric shock protection circuit for an LED lamp. The electric shock protection circuit for the LED tube comprises a trigger module, a first control module and a second control module. The trigger module is connected to a rectifying circuit of the LED tube and configured to output a trigger signal based on a rectified voltage. The first control module comprises a first input terminal, a second input terminal, a third input terminal and an output terminal. The first input terminal of the first control module is connected to the trigger module, the second input terminal and the third input terminal are connected to two terminals of the rectifying circuit, and the first control module is configured to work based on the trigger signal and output a reference voltage via the output terminal based on the rectified voltage. The second control module is connected to the output terminal of the first control module and configured to control the LED tube based on the reference voltage.
[0005] The present invention also discloses an electric shock protection method for an LED tube. The electric shock protection method for the LED tube, comprises outputting a trigger signal based on a rectified voltage of a rectifying circuit of the LED tube; outputting a reference voltage based on the trigger signal and the rectified voltage; outputting a logic control signal based on the reference voltage; and controlling the LED tube based on the logic control signal.
BRIEF DESCRIPTION OF DRAWINGS
[0006] These and other features, aspects and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings, in which like reference numerals are used throughout the drawings to refer to like parts, where:
[0007] FIG. l is a general schematic block diagram of an electric shock protection circuit of an LED lamp according to an embodiment of the present invention;
[0008] FIG. 2 is a schematic circuit diagram of an electric shock protection circuit of an LED lamp of the embodiment of FIG. 1 ;
[0009] FIG. 3 is a flow chart of an electric shock protection method for an LED lamp according to an embodiment of the present invention.
SPECIFIC EMBODIMENTS
[0010] The embodiments of the present invention will be described below in detail with reference to the accompanying drawings in order to facilitate those skilled in the art to exactly understand the subject matter claimed by the present invention. In the following detailed description of these specific embodiments, the present specification does not describe in detail any of the known functions or configurations, to avoid unnecessary details that may affect the disclosure of the present invention.
[0011] Unless otherwise defined, the technical and scientific terms used in the claims and the specification are as they are usually understood by those skilled in the art to which the present invention pertains. "First", "second" and similar words used in the specification and the claims do not denote any order, quantity or importance, but are merely intended to distinguish between different constituents. The terms "one", "a" and similar words are not meant to be limiting, but rather denote the presence of at least one. "Comprising", "consisting of and similar words mean that the elements or articles appearing before "comprising" or "consisting of include the elements or articles and their equivalent elements appearing behind "comprising" or "consisting of, not excluding any other elements or articles. "Connected", "coupled" and similar words are not restricted to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Further, terms indicating a specific position, such as "top", "bottom", "left", "right", and the like are merely descriptions made with reference to specific drawings. The various embodiments disclosed herein may be positioned in different ways as illustrated in the drawings of the present invention. Therefore, the positional terms used herein should not be limited to the positions shown in the particular embodiments.
[0012] FIG. 1 shows a general schematic block diagram of an electric shock protection circuit 100 of an LED tube according to one embodiment of the present invention. Referring to FIG. 1, the electric shock protection circuit 100 is connected to the rectifier circuit 10 of the LED tube and the inverter 20 of the LED tube, respectively. The electric shock protection circuit 100 comprises a trigger module 110, a first control module 120, and a second control module 130. The trigger module 110 is connected to the rectifier circuit 10 for outputting a trigger signal based on the rectified voltage of the rectifier circuit 10. In one embodiment, the trigger signal is a rectangular wave. In one embodiment, the trigger module 110 is configured with a first threshold; when the rectified voltage of the rectifier circuit 10 is greater than or equal to the first threshold, the trigger signal output by the trigger module is a high level signal; when the rectified voltage is lower than the first threshold, The trigger signal output by the trigger module is a low level signal. In an alternative embodiment, the duration of the high level signal among different trigger signals can be configured by selecting a different first threshold. The first control module 120 is coupled to the trigger module 110 for outputting the reference voltage VREF.
[0013] FIG. 2 shows a schematic circuit diagram of a first control module 120 of an electric shock protection circuit 100 of an LED lamp according to a specific embodiment of the present invention. Referring to FIG. 2, the first control module 120 comprises a first input terminal 125, a second input terminal 126, a third input terminal 127, and an output terminal 128. The first input terminal 125 of the first control module 120 is connected to the trigger module 110, the second input terminal 126 and the third input terminal 127 are connected to two terminals of the rectifying circuit 10, the output terminal 128 is connected to the second control module 130. In one embodiment, the first control module 120 comprises a first impedance element 121, a second impedance element 122, a switch element 123, and a reference source module 124. One terminal of the first impedance element 121 is as the first input terminal 125, the other terminal of the first impedance element 121 is connected with a first terminal Ti of the switch element 123 and a first terminal T4 of the reference source module 124 respectively, a second terminal T2 of the switch element is configured as the second input terminal 126, the second impedance element 122 is connected between a second terminal T5 and a third terminal Tb of the reference source module 124, a third terminal T3 of the switch element 123 is connected to the third terminal Tb of the reference source module 124, while the second terminal T5 and the third terminal Tb of the reference source module 124 are configured as the third input terminal 127 and the output terminal 128 respectively.
[0014] In a non-limiting embodiment, the switch element 123 may be an Insulated Gate Bipolar Transistor (IGBT) or a Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The switch element 123 is described by taking a MOSFET as an example; the gate G of the MOSFET is the first terminal Ti of the switch element 123, the drain D is the second terminal T2 of the switch element 123, and the source S is the third terminal T3 of the switch element 123; when the voltage between the gate G and the source S of the MOSFET is higher than a certain threshold, the MOSFET is turned on, that is, the second terminal T2 of the switch element 123 is electrically connected to the third terminal T3, and the first control module 120 operates. In one embodiment, a high level signal in the trigger signal can control the MOSFET to turn on, and a low level signal can control the MOSFET to turn off.
[0015] In a non-limiting embodiment, the reference source module 124 comprises a controllable precision regulated source. The cathode of the controllable precision regulated source is the fist terminal T4 of the reference source module 124, the anode is the second terminal T5 of the reference source module 124, and the reference terminal is the third terminal Tb of the reference source module 124. In one embodiment, the reference source module 124 can define the voltage at the third terminal Tb to be a constant value, for example, 2.5V. In another embodiment, by setting the resistance of the second impedance element 122, the reference source module 124 can output a constant current value.
[0016] In a non-limiting embodiment, the reference source module 124 comprises a series of transistors and a Zener diode; in one embodiment, the transistor comprises an NPN transistor, wherein the base B of the transistor is the first terminal T4 of the reference source module 124, the emitter E is connected to the cathode of the Zener diode, the anode of the Zener diode is the second terminal T5 of the reference source module 124, and the collector C of the transistor is the third terminal Tb of the reference source module 124. In one embodiment, the reference source module 124 can define the voltage at the third terminal Tb to be a constant value, for example, 2.5V. In another embodiment, by setting the resistance of the second impedance element 122, the reference source module 124 can output a constant current value.
[0017] When the trigger signal output by the trigger module 110 is a high level signal, the voltage of the first terminal Ti of the switch element 123 is higher than the voltage of the third terminal T3, so that it is conducting between the second terminal T2 and the third terminal T3, the switch element 123 is turned on, and the first control module 120 operates. When the switch element 123 is turned on, the voltage of the third terminal T3 is low, for example, less than 2.5V, that is, the voltage of the third terminal Tb of the reference source module 124 is less than 2.5 V, and the voltage of the first terminal T4 of the reference source module 124 is at a high level, the current flowing through the second impedance element 122 increases, and the voltage at the output terminal 128 increases. In one embodiment, the resistance of the second impedance element 122 is set to 25 ohms, that is, when the current flowing through the second impedance element 122 reaches 100 milliamps, the voltage at the output terminal 128 reaches 2.5 volts. When the voltage at the output terminal 128 is equal to 2.5 V, that is, when the voltage at the third terminal Tb of the reference source module 124 reaches 2.5 V, the current flowing through the second impedance element 122 does not change, and the voltage at the output terminal 128 is maintained at 2.5 V. That is, when no one touches one end of the LED tube, the first control module 120 outputs the second voltage as a reference voltage. In one embodiment, the second voltage is equal to 2.5V.
[0018] When a person touches one end of the LED tube, the body resistance is connected in series with the second impedance element 122; when the trigger signal output by the trigger module 110 is a high level signal, the third terminal T3 of the switch element 123 is turned on; the voltage is lower, for example, less than 2.5V, that is, the voltage of the third terminal Tb of the reference source module 124 is less than 2.5V, and the voltage of the first terminal T4 of the reference source module 124 is at a high level, the current flowing through the second impedance element 122 and the body resistance increases; however, resistance of the human body is large, for example, between 500 ohms and 2,000 ohms, and the current flowing through the second impedance element and the resistance of the human body cannot reach 100 mA, which means that the voltage at the output terminal 128 does not reach 2.5V. That is, when a person touches one end of the LED tube, the first control module 120 outputs the first voltage as a reference voltage. In one embodiment, the first voltage is less than 2.5 V and the first voltage is less than the second voltage.
[0019] Referring to FIG. 1-2, the second control module 130 is coupled to the output terminal 128 of the first control module 120 for controlling the operation of the LED lamp based on the reference voltage VREF output by the first control module 120; in one embodiment, the second control module 130 can output a logic control signal to control the converter 20 of the LED tube. In an embodiment, the second control module 130 has a second threshold; when the reference voltage VREF output by the first control module 120 is less than the second threshold, the second control module 130 outputs a first logic control signal to control the LED tube to be inoperative; when the reference voltage VREF is not less than the second threshold, the second control module 130 outputs a second logic control signal to control the LED tube to operate normally. In an embodiment, the second threshold of the second control module 130 is not less than the second voltage output by the first control module 120; when the first control module 120 outputs the first voltage, the first voltage is less than the second threshold, and the second control module 130 outputs a first logic control signal to control the LED lamp to be inoperative; when the first control module 120 outputs the second voltage, the second control module 130 outputs a second logic control signal to control the LED lamp to operate normally.
[0020] FIG. 3 illustrates a flow chart of an electric shock protection method 200 for an LED lamp according to an embodiment of the present invention. The electric shock protection method 200 of the LED tube comprises the following steps.
[0021] As shown in FIG. 3, in step 210, a trigger signal is output based on the rectified voltage of the rectifier circuit of the LED lamp. In one embodiment, when the rectified voltage of the rectifying circuit is greater than or equal to the first threshold, the output trigger signal is a high level signal, and when the rectified voltage is less than the first threshold, the output trigger signal is a low level signal, wherein the high level signal duration of the trigger signal can be controlled by setting a first threshold.
[0022] In step 220, the reference voltage is output based on the trigger signal and the rectified voltage. In one embodiment, when a person touches one end of the LED tube, the first voltage is output based on the trigger signal and the rectified voltage, and when no one touches one end of the LED tube, the second voltage is output, wherein the second voltage is greater than the first voltage.
[0023] In step 230, a logic control signal is output based on the reference voltage. In one embodiment, the first logic signal is output when the reference voltage is less than the second threshold, and the second logic signal is output when the reference voltage is not less than the second threshold. In one embodiment, the second threshold is not less than the second voltage.
[0024] In step 240, the LED tube is controlled based on the logic signal. In one embodiment, the LED tube is controlled to be inoperative based on the first logic signal, and the LED tube is controlled to operate normally based on the second logic signal.
[0025] Although the steps of the electric shock protection method according to the specific embodiments of the present invention are shown as functional blocks, the order of the respective functional blocks shown in FIG. 3 and the separation of the actions between the respective functional blocks are not intended to be restrictive. For example, various functional blocks may be executed in a different order, and the actions associated with a functional block may be combined with one or more other functional blocks or may be subdivided into multiple functional blocks.
[0026] While the present invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that many modifications and variations can be made thereto. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and variations insofar as they are within the true spirit and scope of the invention.

Claims

1. An electric shock protection circuit for a LED tube, comprising: a trigger module (110) connected to a rectifying circuit (10) of the LED tube and configured to output a trigger signal based on a rectified voltage; a first control module (120) comprising a first input terminal, a second input terminal, a third input terminal and an output terminal, wherein the first input terminal (125) is connected to the trigger module, the second input terminal (126) and the third input terminal (127) are connected to two terminals of the rectifying circuit, and the first control module is configured to work based on the trigger signal and output a reference voltage via the output terminal based on the rectified voltage; and a second control module (130) connected to the output terminal (128) of the first control module and configured to control the LED tube based on the reference voltage.
2. The electric shock protection circuit according to claim 1, wherein the first control module comprises a first impedance element (121), a second impedance element (122), a switch element (123), and a reference source module (124), and wherein one terminal of the first impedance element is as the first input terminal (125) of the first control module, the other terminal of the first impedance element is connected with a first terminal (Ti) of the switch element and a first terminal (T4) of the reference source module respectively, a second terminal (T2) of the switch element is as the second input terminal (126) of the first control module, the second impedance element is connected between a second terminal (T5) and a third terminal (Tb) of the reference source module, a third terminal (T3) of the switch element is connected to the third terminal of the reference source module, and the second terminal and the third terminal of the reference source module are as the third input terminal and the output terminal of the first control module respectively.
3. The electric shock protection circuit according to claim 2, wherein when a person touches one terminal of the LED tube, a human impedance is in series with the second impedance element, the first control module outputs a first voltage as the reference voltage and the second control module controls the LED tube not to work.
4. The electric shock protection circuit according to claim 3, wherein when no person touches the terminal of the LED tube, the first control module outputs a second voltage as the reference voltage, the second voltage is larger than the first voltage and the second control module controls the LED tube to work.
5. The electric shock protection circuit according to claim 4, wherein the second control module is configured to output a logic control signal to control a convertor of the LED tube based on the reference voltage.
6. The electric shock protection circuit according to claim 5, wherein the second control module has a threshold and is configured to output a first logic control signal to control the LED tube not to work when the reference voltage is less than the threshold, and output a second logic control signal to control the LED tube to work when the reference voltage is no less than the threshold, the first voltage being less than the threshold and the second voltage being no less than the threshold.
7. An electric shock protection method for a LED tube, comprising: outputting a trigger signal based on a rectified voltage of a rectifying circuit of the LED tube; outputting a reference voltage based on the trigger signal and the rectified voltage; outputting a logic control signal based on the reference voltage; and controlling the LED tube based on the logic control signal.
8. The method according to claim 7, wherein outputting the reference voltage based on the trigger signal and the rectified voltage comprises: outputting a first voltage when a person touches one terminal of the LED tube, and outputting a second voltage when no person touches the terminal of the LED tube, the second voltage being larger than the first voltage.
9. The method according to claim 7, wherein outputting the logic control signal based on the reference voltage comprises: outputting a first logic control signal when the reference voltage is less than a threshold, and outputting a second logic control signal when the reference voltage is no less than the threshold.
10. The method according to claim 9, wherein controlling the LED tube based on the logic control signal comprises: controlling the LED tube not to work based on the first logic signal, and controlling the LED tube to work based on the second logic signal.
PCT/US2019/022177 2018-03-28 2019-03-14 An electric shock protection circuit for an led tube and method for same WO2019190757A1 (en)

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PL3809803T3 (en) 2019-10-15 2023-06-05 Silicon Hill B.V. Electronic safety switch for led tube

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