CN108882458A - A kind of LED lamp tube and method of protection against electric shock - Google Patents
A kind of LED lamp tube and method of protection against electric shock Download PDFInfo
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- CN108882458A CN108882458A CN201810827367.9A CN201810827367A CN108882458A CN 108882458 A CN108882458 A CN 108882458A CN 201810827367 A CN201810827367 A CN 201810827367A CN 108882458 A CN108882458 A CN 108882458A
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- 238000000034 method Methods 0.000 title claims description 11
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 31
- 239000003381 stabilizer Substances 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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- 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
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Abstract
The present invention relates to LED lamp tube technical fields, and in particular to a kind of LED lamp tube of protection against electric shock, rectification circuit, drain current limit circuit and LED drive circuit including shell and in shell；The detection circuit includes for the detection module of detection input IN_L voltage and for providing the constant flow module of detection electric current to LED lamp tube；The main control module is for triggering constant flow module；The main control module is used to receive the voltage of detection module detection；The switching circuit includes switching tube U2, switch module and voltage reduction module；The input of the voltage reduction module terminates output end VH；The main control module is used for trigger switch module.The present invention is by setting constant flow module, by main control module comparison by the input voltage size before and after continuous current, to judge whether direct body contact's LED lamp tube, to prevent user from getting an electric shock.
Description
Technical field
The present invention relates to LED lamp tube technical fields, and in particular to a kind of LED lamp tube and method of protection against electric shock.
Background technique
LED has the characteristics that power and energy saving and service life are long, and more and more people directly replace fluorescent lamp using LED lamp tube
Pipe, and usually there are two types of modes for the starting of LED；
The first be ballast output the linear driver of voltage after start LED；
The second way will be directly electrically connected with city using constant-flow driver, and alternating current drives after passing through constant-flow driver
LED, and the voltage of alternating current is easy to cause harm to the human body greatly.
When LED lamp tube is Double-End Source, if one of the both-end of LED lamp tube be inserted into lamp holder and the other end not yet
When being inserted into lamp holder, if user touches the metal for being not inserted into lamp holder end or conductive part, it is possible to get an electric shock.
Summary of the invention
The purpose of the present invention is being directed to above-mentioned deficiency in the prior art, provide a kind of protection against electric shock LED lamp tube and its
Method can prevent the case where getting an electric shock by above-mentioned LED lamp tube.
The purpose of the present invention is achieved through the following technical solutions：A kind of LED lamp tube of protection against electric shock, including shell and be all provided with
In rectification circuit, drain current limit circuit and LED drive circuit in shell；
The rectification circuit includes input terminal IN_L and output end VH；
The drain current limit circuit includes main control module, detection circuit and switching circuit；
The detection circuit includes for the detection module of detection input IN_L voltage and for providing to LED lamp tube
Detect the constant flow module of electric current；The main control module is for triggering constant flow module；The main control module is for receiving detection module
The voltage of detection；
The switching circuit includes the switching tube U2 for controlling LED drive circuit work, opens and closes for control switch pipe U2
Switch module and for main control module, switch module provide voltage voltage reduction module；The input of the voltage reduction module terminates
Output end VH；The main control module is used for trigger switch module.
The present invention is further arranged to, and the voltage reduction module includes diode D1, resistance R1, resistance R2, triode T5, two
Pole pipe D3, capacitor C10, capacitor C1, resistance R3, capacitor C2 and diode DW；
The anode of the diode D1 meets output end VH；The cathode of the diode D1 connects triode T5's by resistance R1
Collector；The cathode of the diode D1 connects the base stage of triode T5 by resistance R2；The base stage of the triode T5 passes through two
Pole pipe D3 ground connection；The capacitor C10 is in parallel with diode D3；The emitter of the triode T5 is grounded by capacitor C1；It is described
The emitter of triode T5 connects switch module；One end of the emitter connecting resistance R3 of the triode T5；The resistance R3's is another
One termination main control module；The other end of the resistance R3 is grounded by capacitor C2；The diode DW is in parallel with capacitor C2.
The present invention is further arranged to, and the switching tube U2 is metal-oxide-semiconductor；The switch module includes triode T6, three poles
Pipe T1, resistance R4 and resistance R5；The base stage of the triode T1 connects main control module；The emitter of the triode T1 is grounded；
The collector of the triode T1 connects the base stage of triode T6 by resistance R5；The emitter of the triode T6 connects decompression mould
Block；The collector of the triode T6 is grounded by resistance R4；The collector of the triode T6 connects the grid of switching tube U2；Institute
State the source electrode ground connection of switching tube U2；The drain electrode of the switching tube U2 connects LED drive circuit.
The present invention is further arranged to, the constant flow module include resistance R7, triode T3, resistance R9, resistance R8 and
Voltage-stabiliser tube T4；The plus earth of the voltage-stabiliser tube T4；The cathode of the voltage-stabiliser tube T4 connects main control module by resistance R7；It is described steady
The cathode of pressure pipe T4 is connect with the base stage of triode T3；The reference edge of the voltage-stabiliser tube T4 is connect with the emitter of triode T3；
The emitter of the triode T3 is grounded；The collector of the triode T3 is connect by resistance R9 with input terminal IN_L.
The present invention is further arranged to, and the voltage-stabiliser tube T4 is chip TL432.
The present invention is further arranged to, the detection module include resistance R15, resistance R13, resistance R14, capacitor C8 and
Capacitor C9；The input terminal IN_L is connect with one end of resistance R15；The other end of the resistance R15 is grounded by resistance R14；
The other end of the resistance R15 connects main control module by resistance R13；The capacitor C9 is in parallel with resistance R14；The resistance R13
It is grounded by resistance C8.
The present invention is further arranged to, and the rectification circuit is bridge rectifier.
A kind of electric shock prevention method, includes the following steps：
A. main control module acquires the voltage V1 of input terminal IN_L by detection module；
B. main control module triggering constant flow module outputs current in LED lamp tube, and main control module passes through detection module again at this time
The voltage V2 of secondary acquisition input terminal IN_L；
C. main control module judges the difference of voltage V1 Yu voltage V2, if difference is greater than scheduled threshold value, trigger switch mould
Block opens switching tube U2, so that LED drive circuit stops working；If difference is less than scheduled threshold value, trigger switch
Module is closed switching tube U2, so that LED drive circuit works normally.
D. between step A and step B, further include：Step A2. main control module judges the frequency of collection voltages V1, if
High frequency voltage, trigger switch module are closed switching tube U2, so that LED drive circuit works normally；If low-frequency electrical
Pressure, then carry out step B.
Beneficial effects of the present invention：The present invention passes through continuous current by setting constant flow module, by main control module comparison
The input voltage size of front and back, to judge whether direct body contact's LED lamp tube, to prevent user from getting an electric shock.
Detailed description of the invention
Invention is described further using attached drawing, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to the following drawings
Its attached drawing.
Fig. 1 is the principle of the present invention figure；
Fig. 2 is the circuit diagram of detection circuit of the present invention；
Fig. 3 is the circuit diagram of switching circuit of the present invention；
Fig. 4 is the circuit diagram of main control module of the present invention；
Wherein：1- detection module；2- constant flow module；3- voltage reduction module；4- switch module.
Specific embodiment
The invention will be further described with the following Examples.
From Fig. 1 to Fig. 4；A kind of LED lamp tube of protection against electric shock described in the present embodiment, including shell and be set to outer
Rectification circuit, drain current limit circuit and LED drive circuit in shell；
The rectification circuit includes input terminal IN_L and output end VH；
The drain current limit circuit includes main control module, detection circuit and switching circuit；
The detection circuit includes for the detection module 1 of detection input IN_L voltage and for mentioning to LED lamp tube
For detecting the constant flow module 2 of electric current；The main control module is for triggering constant flow module 2；The main control module is for receiving detection
The voltage that module 1 detects；
The switching circuit includes the switching tube U2 for controlling LED drive circuit work, opens and closes for control switch pipe U2
Switch module 4 and for main control module, switch module 4 provide voltage voltage reduction module 3；The input of the voltage reduction module 3
Terminate output end VH；The main control module is used for trigger switch module 4.
Specifically, LED lamp tube described in the present embodiment, in order to detect LED lamp tube both-end all be inserted into lamp holder or
Lamp holder, the other end and human contact are inserted into one end of LED lamp tube；
Switching tube U2 is closed, electronics does not first trigger constant flow module 2, main control module pass through first detection module 1 acquire it is defeated
Enter to hold the voltage V1 of IN_L, wherein main control module is single-chip microcontroller, then constantly triggers constant flow module 2, the present embodiment is by setting
Constant flow module 2 is set, and it is to constant current hold be tested, ensure reliability in this way in AC100V-277V that constant-current circuit, which is added,
And accuracy, and the triggering output of constant flow module 2 of main control module constant current at this time is less than the electric current of 1mA, and the electric current of 1mA can't be right
Human body impacts, and main control module acquires the voltage V2 of input terminal IN_L by detection module 1 again at this time, if human body does not touch
LED lamp tube is touched, voltage V2 and the size of voltage V1 are almost the same, at this time, then it is assumed that the both-end of LED lamp tube has all been inserted into lamp
Seat, switching tube U2 are kept closed, so that LED drive circuit works normally；
If human body touch is to LED lamp tube, human body and LED lamp tube form series loop, since the resistance of human body is larger, therefore
Electric current less than 1mA can generate biggish voltage to divide alternating current, so that the voltage of input terminal IN_L subtracts after human body
Few, voltage V2 and the difference in size of voltage V1 are larger at this time, and trigger switch module 4 disconnects switching tube U2, so that LED
Driving circuit stops working, and prevents user from getting an electric shock, to judge whether LED lamp tube has the generation of leakage current.
A kind of LED lamp tube of protection against electric shock described in the present embodiment, the voltage reduction module 3 include diode D1, resistance R1, electricity
Hinder R2, triode T5, diode D3, capacitor C10, capacitor C1, resistance R3, capacitor C2 and diode DW；
The anode of the diode D1 meets output end VH；The cathode of the diode D1 connects triode T5's by resistance R1
Collector；The cathode of the diode D1 connects the base stage of triode T5 by resistance R2；The base stage of the triode T5 passes through two
Pole pipe D3 ground connection；The capacitor C10 is in parallel with diode D3；The emitter of the triode T5 is grounded by capacitor C1；It is described
The emitter of triode T5 connects switch module 4；One end of the emitter connecting resistance R3 of the triode T5；The resistance R3's is another
One termination main control module；The other end of the resistance R3 is grounded by capacitor C2；The diode DW is in parallel with capacitor C2.
Specifically, triode T5, resistance R1 and resistance R2 form first order decompression, so that the voltage of output end VH reduces
It powers to switch module 4, and is divided by resistance R3 and powered to main control module.
A kind of LED lamp tube of protection against electric shock described in the present embodiment, the switching tube U2 are metal-oxide-semiconductor；The switch module 4 wraps
Include triode T6, triode T1, resistance R4 and resistance R5；The base stage of the triode T1 connects main control module；The triode
The emitter of T1 is grounded；The collector of the triode T1 connects the base stage of triode T6 by resistance R5；The triode T6's
Emitter connects voltage reduction module 3；The collector of the triode T6 is grounded by resistance R4；The collector of the triode T6 connects out
Close the grid of pipe U2；The source electrode of the switching tube U2 is grounded；The drain electrode of the switching tube U2 connects LED drive circuit.
Specifically, in the case where not having electric shock, main control module provides reference voltage to the base stage of triode T1, makes
Triode T1 closure is obtained, so that triode T6 is closed, LED drive circuit is connected after obtaining voltage in the grid of metal-oxide-semiconductor, thus
So that output end VH, output end VL and LED drive circuit form closed circuit.
A kind of LED lamp tube of protection against electric shock described in the present embodiment, the constant flow module 2 include resistance R7, triode T3, electricity
Hinder R9, resistance R8 and voltage-stabiliser tube T4；The plus earth of the voltage-stabiliser tube T4；The cathode of the voltage-stabiliser tube T4 is connect by resistance R7
Main control module；The cathode of the voltage-stabiliser tube T4 is connect with the base stage of triode T3；The reference edge and triode of the voltage-stabiliser tube T4
The emitter of T3 connects；The emitter of the triode T3 is grounded；The collector of the triode T3 is by resistance R9 and input
Hold IN_L connection.A kind of LED lamp tube of protection against electric shock described in the present embodiment, the voltage-stabiliser tube T4 are chip TL432.
Specifically, when needing output constant current electric current, main control module triggering micro-current gives resistance R7, so that triode
T3 base stage obtains voltage to be connected, due to the effect of voltage-stabiliser tube T4 and resistance R8, so that output is less than 1mA's at resistance R9
On constant current to LED lamp tube.
A kind of LED lamp tube of protection against electric shock described in the present embodiment, the detection module 1 include resistance R15, resistance R13, electricity
Hinder R14, capacitor C8 and capacitor C9；The input terminal IN_L is connect with one end of resistance R15；The other end of the resistance R15
It is grounded by resistance R14；The other end of the resistance R15 connects main control module by resistance R13；The capacitor C9 and resistance R14
It is in parallel；The resistance R13 is grounded by resistance C8.
Specifically, resistance R15 and resistance R14 plays the role of partial pressure, and resistance R13 and capacitor C8 form RC and filter mould
Block.
A kind of LED lamp tube of protection against electric shock described in the present embodiment, the rectification circuit are bridge rectifier.
A kind of electric shock prevention method, includes the following steps described in the present embodiment：
A. main control module acquires the voltage V1 of input terminal IN_L by detection module 1；
B. main control module triggering constant flow module 2 outputs current in LED lamp tube, and main control module passes through detection module 1 at this time
The voltage V2 of input terminal IN_L is acquired again；
C. main control module judges the difference of voltage V1 Yu voltage V2, if difference is greater than scheduled threshold value, trigger switch mould
Block 4 opens switching tube U2, so that LED drive circuit stops working；If difference is less than scheduled threshold value, trigger switch
Module 4 is closed switching tube U2, so that LED drive circuit works normally.
A kind of electric shock prevention method described in the present embodiment further includes between step A and step B：Step A2. master control mould
Block judges the frequency of collection voltages V1, if high frequency voltage, trigger switch module 4 is closed switching tube U2, so that LED
Driving circuit works normally；If low-frequency voltage, then step B is carried out.
Since the power supply of lamp holder is possible to the alternating current for 220V, it is also possible to the lower ballast voltage of voltage, master control mould
Block pass through first detection module 1 acquire input terminal IN_L voltage V1, wherein main control module be single-chip microcontroller, then by main control module into
Row logical process and judgement, judge the frequency of voltage V1, and since the line voltage of 220V is low-frequency voltage, and ballast voltage is
High frequency voltage, when main control module judges the frequency of voltage V1 for high frequency voltage, i.e. ballast voltage, and the electricity of ballast voltage
Press lower, human body do not injured substantially, so when main control module directly output driving trigger switch module 4 can to switch
Pipe U2 closure, so that LED drive circuit works normally.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of range is protected, although explaining in detail referring to preferred embodiment to the present invention, those skilled in the art are answered
Work as understanding, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (9)
1. a kind of LED lamp tube of protection against electric shock, it is characterised in that：Rectification circuit, electric leakage including shell and in shell
Flow limiting circuit and LED drive circuit；
The rectification circuit includes input terminal IN_L and output end VH；
The drain current limit circuit includes main control module, detection circuit and switching circuit；
The detection circuit includes for the detection module (1) of detection input IN_L voltage and for providing to LED lamp tube
Detect the constant flow module (2) of electric current；The main control module is for triggering constant flow module (2)；The main control module is for receiving inspection
Survey the voltage of module (1) detection；
The switching circuit includes the switching tube U2 for controlling LED drive circuit work, for the switch of control switch pipe U2 folding
Module (4) and for main control module, switch module (4) provide voltage voltage reduction module (3)；The voltage reduction module (3)
Input termination output end VH；The main control module is used for trigger switch module (4).
2. a kind of LED lamp tube of protection against electric shock according to claim 1, it is characterised in that：The voltage reduction module (3) includes two
Pole pipe D1, resistance R1, resistance R2, triode T5, diode D3, capacitor C10, capacitor C1, resistance R3, capacitor C2 and diode
DW；
The anode of the diode D1 meets output end VH；The cathode of the diode D1 connects the current collection of triode T5 by resistance R1
Pole；The cathode of the diode D1 connects the base stage of triode T5 by resistance R2；The base stage of the triode T5 passes through diode
D3 ground connection；The capacitor C10 is in parallel with diode D3；The emitter of the triode T5 is grounded by capacitor C1；Three pole
The emitter of pipe T5 connects switch module (4)；One end of the emitter connecting resistance R3 of the triode T5；The resistance R3's is another
Terminate main control module；The other end of the resistance R3 is grounded by capacitor C2；The diode DW is in parallel with capacitor C2.
3. a kind of LED lamp tube of protection against electric shock according to claim 1, it is characterised in that：The switching tube U2 is metal-oxide-semiconductor；
The switch module (4) includes triode T6, triode T1, resistance R4 and resistance R5；The base stage of the triode T1 meets master
Control module；The emitter of the triode T1 is grounded；The collector of the triode T1 connects the base of triode T6 by resistance R5
Pole；The emitter of the triode T6 connects voltage reduction module (3)；The collector of the triode T6 is grounded by resistance R4；It is described
The collector of triode T6 connects the grid of switching tube U2；The source electrode of the switching tube U2 is grounded；The drain electrode of the switching tube U2 connects
LED drive circuit.
4. a kind of LED lamp tube of protection against electric shock according to claim 1, it is characterised in that：The constant flow module (2) includes electricity
Hinder R7, triode T3, resistance R9, resistance R8 and voltage-stabiliser tube T4；The plus earth of the voltage-stabiliser tube T4；The voltage-stabiliser tube T4's
Cathode connects main control module by resistance R7；The cathode of the voltage-stabiliser tube T4 is connect with the base stage of triode T3；The voltage-stabiliser tube T4
Reference edge connect with the emitter of triode T3；The emitter of the triode T3 is grounded；The collector of the triode T3
It is connect by resistance R9 with input terminal IN_L.
5. a kind of LED lamp tube of protection against electric shock according to claim 4, it is characterised in that：The voltage-stabiliser tube T4 is chip
TL432。
6. a kind of LED lamp tube of protection against electric shock according to claim 1, it is characterised in that：The detection module (1) includes electricity
Hinder R15, resistance R13, resistance R14, capacitor C8 and capacitor C9；The input terminal IN_L is connect with one end of resistance R15；It is described
The other end of resistance R15 is grounded by resistance R14；The other end of the resistance R15 connects main control module by resistance R13；It is described
Capacitor C9 is in parallel with resistance R14；The resistance R13 is grounded by resistance C8.
7. a kind of LED lamp tube of protection against electric shock according to claim 1, it is characterised in that：The rectification circuit is that bridge-type is whole
Current circuit.
8. a kind of electric shock prevention method using LED lamp tube described in claim 1, it is characterised in that：Include the following steps：
A. main control module acquires the voltage V1 of input terminal IN_L by detection module (1)；
B. main control module triggering constant flow module (2) outputs current in LED lamp tube, and main control module passes through detection module (1) at this time
The voltage V2 of input terminal IN_L is acquired again；
C. main control module judges the difference of voltage V1 Yu voltage V2, if difference is greater than scheduled threshold value, trigger switch module (4)
So that switching tube U2 is opened, so that LED drive circuit stops working；If difference is less than scheduled threshold value, trigger switch mould
Block (4) is closed switching tube U2, so that LED drive circuit works normally.
9. electric shock prevention method according to claim 8, it is characterised in that：Between step A and step B, further include：Step
A2. main control module judges the frequency of collection voltages V1, if high frequency voltage, trigger switch module (4) is closed switching tube U2,
So that LED drive circuit works normally；If low-frequency voltage, then step B is carried out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810827367.9A CN108882458A (en) | 2018-07-25 | 2018-07-25 | A kind of LED lamp tube and method of protection against electric shock |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810827367.9A CN108882458A (en) | 2018-07-25 | 2018-07-25 | A kind of LED lamp tube and method of protection against electric shock |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730538A (en) * | 2019-09-12 | 2020-01-24 | 帝奥微电子有限公司 | LED drive circuit and control method thereof |
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| CN208509332U (en) * | 2018-07-25 | 2019-02-15 | 东莞市灿光电子科技有限公司 | A kind of LED lamp tube of protection against electric shock |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110730538A (en) * | 2019-09-12 | 2020-01-24 | 帝奥微电子有限公司 | LED drive circuit and control method thereof |
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