CN206314031U - A kind of LED drive circuit and LED light device - Google Patents
A kind of LED drive circuit and LED light device Download PDFInfo
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- CN206314031U CN206314031U CN201621412160.8U CN201621412160U CN206314031U CN 206314031 U CN206314031 U CN 206314031U CN 201621412160 U CN201621412160 U CN 201621412160U CN 206314031 U CN206314031 U CN 206314031U
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Abstract
The utility model belongs to LED drive controls field, there is provided a kind of LED drive circuit and LED light device.The utility model by using including the LED drive circuit of input module, rectifier input control module, civil power input control module and VRM Voltage Regulator Module, by input module when the low frequency ac that civil power is input into is received output low frequency direct current；By the constant low-frequency d electricity of civil power input control module control voltage adjustment module output voltage driving LED；By rectifier input control module, when the high-frequency alternating current of electron rectifier input is detected, control civil power input control module is stopped, high-frequency DC is exported by input module, by VRM Voltage Regulator Module by high-frequency direct-current electricity output driving LED, so that the circuit compatible electronic rectifier and civil power can be input into simultaneously, and due to tapped buck-boost module centered on VRM Voltage Regulator Module, therefore, the harmonic distortion of whole circuit is relatively low, and conversion efficiency is higher.
Description
Technical field
The utility model belongs to LED drive controls field, more particularly to a kind of LED drive circuit and LED light device.
Background technology
At present, LED tube drive circuit main flow on the market has three major types：The first kind is in electron rectifier
The circuit used under (electronic rectifier, ECG) input, such circuit exists due to the diversity of ECG models
The limited problem of compatibility, and because the frequency of the alternating current of ECG outputs is (40KHZ~70KHZ) higher, civil power
The frequency of the alternating current of (alternating current, AC) output is relatively low (50HZ or 60HZ), therefore, such circuit cannot
Normally used under civil power input；Equations of The Second Kind is step-down (buck) circuit used under civil power input, the harmonic wave of such circuit
Distortion is higher, conversion efficiency is relatively low, power output is limited, and cannot normally be used under the conditions of ECG；3rd class is defeated in civil power
Enter lower center tapped buck-boost (buck-boost) circuit for using, such circuit loses relative to Equations of The Second Kind circuit, harmonic wave
Very relatively low, circuit conversion efficiency is higher, however, such circuit also cannot normally be used under the conditions of ECG.
It is in summary, existing that the presence of LED tube drive circuit cannot compatible electronic rectifier be input into and civil power is defeated simultaneously
The problem for entering.
Utility model content
The purpose of this utility model is to provide a kind of LED drive circuit and LED light device, it is intended to solved existing
LED tube drive circuit be present cannot compatible electronic rectifier input simultaneously and civil power input.
The utility model is achieved in that a kind of LED drive circuit, is connected with LED, the LED drive circuit bag
Include：Compatible civil power and input module, rectifier input control module, civil power input control module, the electricity of electron rectifier input
Pressure adjustment module and output module；Tapped buck-boost module centered on the VRM Voltage Regulator Module；
The input of the input module is the input of the LED drive circuit, the rectifier input control module
Test side, the first control end and the second control end test side respectively with the input module, civil power input control mould
The negative pole connection of the controlled end of block and the LED, the input and control end of the civil power input control module respectively with institute
State the controlled end connection of the output end and the VRM Voltage Regulator Module of input module, the input of the VRM Voltage Regulator Module and institute
The output end for stating input module is connected to the isolation end of the output module altogether, and the output end of the VRM Voltage Regulator Module is defeated with described
The second output end for going out module is connected to the positive pole of the LED, the first output end and the LED of the output module altogether
Negative pole is connected；
If the input module receives the low frequency ac of city's electricity output, the input module is to the low-frequency ac
Electricity carries out rectifying and wave-filtering treatment, and output low frequency direct current is to the civil power input control module and the VRM Voltage Regulator Module；
The civil power input control module is started working under the driving of low-frequency d electricity, and controls the VRM Voltage Regulator Module defeated
Go out the low-frequency d electricity of voltage constant, control is driven with to the LED；
If detecting the high-frequency alternating current that the input module receives electron rectifier output, the rectifier input
Control module controls the civil power input control module to be stopped, and the negative pole of the LED is connected to the ground；The input
Module carries out rectifying and wave-filtering treatment to the high-frequency alternating current, and exports high-frequency DC to the VRM Voltage Regulator Module；It is described
The high-frequency direct-current electricity output to the LED is driven control by VRM Voltage Regulator Module with to the LED.
The utility model additionally provides a kind of LED light device, including LED, and the LED light device includes above-mentioned
LED drive circuit.
The utility model includes input module, rectifier input control module, civil power input control module, electricity by using
The LED drive circuit of pressure adjustment module and output module, it is right by input module when the low frequency ac of city's electricity output is received
Low frequency ac carries out rectifying and wave-filtering treatment, and output low frequency direct current is to civil power input control module and VRM Voltage Regulator Module；
Started working under the driving of low-frequency d electricity by civil power input control module, and control voltage adjustment module output voltage is constant
Low-frequency d electricity, to be driven control to LED；Received detecting input module by rectifier input control module
Control civil power input control module is stopped during the high-frequency alternating current of electron rectifier output, by input module to high-frequency ac
Electricity carries out rectifying and wave-filtering treatment, and exports high-frequency DC to VRM Voltage Regulator Module, by VRM Voltage Regulator Module by high-frequency DC
Exported to LED by output module, to be driven control to LED, so that the circuit can be while compatible electronic be whole
The input of stream device and civil power input, and due to tapped buck-boost module centered on VRM Voltage Regulator Module, therefore, whole circuit
Harmonic distortion is relatively low, and conversion efficiency is higher.
Brief description of the drawings
Fig. 1 is a kind of function structure chart of LED drive circuit that the utility model embodiment is provided；
Fig. 2 is a kind of function structure chart of LED drive circuit that another embodiment of the utility model is provided；
Fig. 3 is a kind of circuit structure diagram of LED drive circuit that the utility model embodiment is provided.
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only used to explain
The utility model, is not used to limit the utility model.
It should be noted that in specification and claims of the present utility model term " including " and they are any
Deformation, it is intended that covering is non-exclusive to be included.Process, method or system, product for example comprising series of steps or unit
Or equipment is not limited to the step of having listed or unit, but alternatively also include the step of not listing or unit, or can
Selection of land also includes for these processes, method, product or other intrinsic steps of equipment or unit.Additionally, term " first ",
" second " and " the 3rd " etc. are for distinguishing different objects, not for description particular order.
Fig. 1 shows a kind of modular structure of LED drive circuit that the utility model embodiment is provided, for the ease of saying
It is bright, the part related to the utility model embodiment is illustrate only, details are as follows：
As shown in figure 1, a kind of LED drive circuit, its input and electron rectifier (electronic rectifier,
ECG) or civil power (alternating current, AC) connection, for receive electron rectifier output high-frequency alternating current
The low frequency ac (50HZ or 60HZ) of (40KHZ~70KHZ) or city's electricity output, output end and the LED of LED drive circuit connect
Connect, for being driven to LED.
Specifically, LED drive circuit includes：Compatible civil power and the input module 10, rectifier of electron rectifier input are defeated
Enter control module 20, civil power input control module 30, VRM Voltage Regulator Module 40 and output module 50.VRM Voltage Regulator Module 40 is specific
Centered on tapped buck-boost (buck-boost) module.
Wherein, the input of input module 10 is the input of LED drive circuit, the inspection of rectifier input control module 20
Survey end, the first control end and the second control end test side respectively with input module 10, civil power input control module 30 it is controlled
The negative pole LED- connections of end and LED, the input and control end of civil power input control module 20 respectively with input module 10
The controlled end connection of output end and VRM Voltage Regulator Module 40, the input of VRM Voltage Regulator Module 40 and the output end of input module 10
The isolation end of output module 50 is connected to altogether, and the output end of VRM Voltage Regulator Module 40 is connected to altogether with the second output end of output module 50
The positive pole LED+ of LED, the first output end of output module 50 is connected with the negative pole LED- of LED.
If input module 10 receives the low frequency ac of city's electricity output, input module 10 carries out whole to low frequency ac
Stream filtering process, and output low frequency direct current is to civil power input control module 30 and VRM Voltage Regulator Module 40；Civil power input control
Module 30 is started working under the driving of low-frequency d electricity, and the constant low-frequency d of the output voltage of control voltage adjustment module 40
Electricity, to be driven control to LED.
If detecting the high-frequency alternating current that input module 10 receives electron rectifier output, rectifier input control mould
The control civil power of block 20 input control module 30 is stopped, and the negative pole LED- of LED is connected to the ground, and input module 10 pairs is high
Frequency alternating current carries out rectifying and wave-filtering treatment, and exports high-frequency DC to VRM Voltage Regulator Module 40, and VRM Voltage Regulator Module 40 is by height
Frequency direct current electricity output to LED, to be driven control to LED.
In the utility model embodiment, output module 50 be used for VRM Voltage Regulator Module 40 output high-frequency DC or
Low-frequency d electricity is filtered treatment.Meanwhile, output module 50 is additionally operable to isolate circuit, to prevent VRM Voltage Regulator Module
The electric current of 40 outputs flows back into input module 10 and causes short circuit phenomenon again.
In the utility model embodiment, rectifier input control module 20 is used to detect the input letter of LED drive circuit
Number frequency, its allow electron rectifier high-frequency alternating current pass through, prevent civil power low frequency ac pass through.When LED drives
Circuit for civil power be input into when, the low frequency signal of civil power cannot be directly input into and controlled by rectifier input control module 20 from civil power
Molding block 30 and VRM Voltage Regulator Module 40 are sent to LED；When LED drive circuit is input into for electron rectifier, rectifier input
After control module 20 detects high-frequency signal, control civil power input control module 30 is stopped so that high-frequency signal is directly passed through
VRM Voltage Regulator Module 40 is sent to LED.I.e. LED drive circuit can normal work when civil power input and electron rectifier are input into
Make, it is achieved thereby that the compatibility of electron rectifier and civil power.
The utility model embodiment uses center tapped buck-boost (buck-boost) mould in LED drive circuit
Block, therefore high conversion efficiency and low harmonics distortion can be realized so that harmonic distortion can be less than 5%.
Fig. 2 shows a kind of modular structure of LED drive circuit that another embodiment of the utility model is provided, for the ease of
Illustrate, illustrate only the part related to the utility model embodiment, details are as follows：
As shown in Fig. 2 input module 10 includes LC filter units 100, rectifying bridge unit 101 and π types filter unit 102.
The input of LC filter units 100 for input module 10 input, the first test side of LC filter units 100 and
Second test side constitutes the test side of input module 10, first output end and the second output end of LC filter units 100 respectively with
The first input end of rectifying bridge unit 101 and the second input are connected, the positive output end and negative output terminal point of rectifying bridge unit 101
It is not connected with the positive input terminal and negative input end of π types filter unit 102, the output end of π types filter unit 102 is input module 10
Output end.
LC filter units 100 are used for the high-frequency alternating current provided electron rectifier or the low frequency ac of civil power offer enters
Row filtering process；Rectifying bridge unit 101 is used to carry out rectification to high-frequency alternating current or low frequency ac, and exports high-frequency DC
Or low-frequency d electricity；π types filter unit 102 be used for filter high-frequency DC or low-frequency d electricity in AC compounent so that
The galvanic ripple that rectification is obtained is smaller；Output module 50 is used to further be filtered the direct current after filtering, carries
The antijamming capability of circuit high.
Used as the embodiment of the utility model one, rectifier input control module 20 includes high frequency sampling unit 200, rectifier
U2, voltage regulation unit 202, the shut-off control unit 204 of control unit 203 and second.
The first input end of high frequency sampling unit 200 and the second input constitute the detection of rectifier input control module 20
End, the first input end of high frequency sampling unit 200 and the second input respectively with the first test side of LC filter units 100 and the
Two test sides connect, first output end and the second output end of high frequency sampling unit 200 respectively with first input of rectifier U2
End and the connection of the second input, the positive output end and negative output terminal of rectifier U2 respectively with the positive input terminal of voltage regulation unit 202 and
Negative input end is connected, the output end of voltage regulation unit 202 simultaneously with the input and the second control unit of shut-off control unit 203
204 input connection, the output end of the output end and the second control unit 204 that turn off control unit 203 is respectively rectifier
First control end and the second control end of input control module 20.
High frequency sampling unit 200 is used for the frequency of the input signal for detecting LED drive circuit, and it allows electron rectifier
High-frequency alternating current passes through, and prevents the low frequency ac of civil power from passing through.When high frequency sampling unit 200 detects input to LC filtering lists
When the signal of unit 100 is high-frequency ac electric signal, high frequency sampling unit 200 pairs is by high-frequency ac electric signal output to rectifier
U2；Rectifier U2 carries out rectification to high-frequency alternating current, and exports high-frequency DC；Voltage regulation unit 202 is carried out to high-frequency DC
Voltage stabilizing, and export high level signal to the shut-off control unit 204 of control unit 203 and second；Shut-off control unit 203 is being received
Turned off to civil power input control module 30 is controlled during high level signal so that high-frequency signal is directly over LC filter units 100, whole
Stream bridge unit 101, π types filter unit 102 and center tapped voltage regulation unit flow into the positive pole LED+ of LED；Meanwhile, the
Be connected to the ground for the negative pole LED- of LED by two control units 204.
Used as the embodiment of the utility model one, rectifier input control module 20 also includes open-circuit-protection unit 201.
The positive input terminal and negative input end of open-circuit-protection unit 201 respectively with the positive output end of rectifying bridge unit 101 and negative
Output end is connected, and the output end of open-circuit-protection unit 201 is connected with the positive output end of rectifier U2.
When circuit is in no-load condition, i.e. load open circuit, the output voltage of rectifier input control module 20 is up to
800-1000V, if no safeguard measure circuit may be burned out.Open-circuit-protection unit 201 is used to be in unloaded feelings in circuit
Open-circuit-protection is realized during condition, will not be damaged with protection circuit.
Fig. 3 shows a kind of circuit structure of LED drive circuit that the utility model embodiment is provided, for the ease of saying
It is bright, the part related to the utility model embodiment is illustrate only, details are as follows：
As shown in figure 3, as the embodiment of the utility model one, the sampling end and voltage output end point of VRM Voltage Regulator Module 40
It is not connected with the sampling end and voltage input end of civil power input control module 30；VRM Voltage Regulator Module 40 includes transformer T1, the
Three diode D3, the 4th switching tube Q4 and the 19th electric capacity C19.
First different name end a of the armature winding of transformer T1 is the input of VRM Voltage Regulator Module 40, the of armature winding
Two different name end b, the Same Name of Ends c of armature winding, the hot end of the 4th switching tube Q4 and the first end of the 19th electric capacity C19 connect altogether
In the positive pole of the 3rd diode D3, the negative pole of the 3rd diode D3 is the output end of VRM Voltage Regulator Module 40, and transformer T1's is secondary
The Same Name of Ends d of level winding is the voltage output end of VRM Voltage Regulator Module 40, the different name end e ground connection of secondary windings, the 4th switching tube
The control end of Q4 is the controlled end of VRM Voltage Regulator Module 40, the of the cold end of the 4th switching tube Q4 and the 19th electric capacity C19
Two ends connect the sampling end as VRM Voltage Regulator Module 40 altogether.
In the utility model embodiment, the 4th switching tube Q4 can be the 4th NMOS tube, the grid of the 4th NMOS tube, leakage
Pole and source electrode are respectively control end, hot end and the cold end of the 4th switching tube Q4.Certainly, the 4th switching tube Q4 can be with
It is the switching devices such as triode, insulated gate bipolar transistor (InsulatedGate Bipolar Transistor, IGBT),
It is configured with specific reference to actual demand, is not limited herein.
Used as the embodiment of the utility model one, output module 50 includes：Second diode D2, the 22nd electric capacity C22,
23 electric capacity C23, the 24th electric capacity C24 and the 27th resistance R27.
The negative pole of the second diode D2 is the isolation end of output module 50, the positive pole of the second diode D2, the 22nd electricity
Hold negative pole, the first end of the 23rd electric capacity C23, the first end of the 24th electric capacity C24 and the 27th resistance R27 of C22
First end connect altogether as the first output end of output module 50, the positive pole of the 22nd electric capacity C22, the 23rd electric capacity C23
The second end and second end of the 27th resistance R27 connect altogether as the second output end of output module 50, the 24th electric capacity
The second end ground connection of C24.
Used as the embodiment of the utility model one, LC filter units 100 include：First fuse F1, the second fuse F2,
Three fuse F3, the first inductance L1, the second inductance L2, the first electric capacity C1, the second electric capacity C2, first resistor R1, second resistance R2,
3rd electric capacity C3, the 4th electric capacity C4,3rd resistor R3, the 3rd inductance L3, common mode inductance L7, the 4th inductance L, the 4th resistance R4,
5th electric capacity C5, the 6th inductance L6, the 6th resistance R6 and the 8th electric capacity C8.
The first end of the first end of the first fuse F1, the first end of the second fuse F2 and the 3rd fuse F3 constitutes LC
The input of filter unit 100, second end of the first fuse F1, second end of the second fuse F2, the of the first inductance L1
The first end of one end, the first end of the first electric capacity C1 and first resistor R1 is connected to the first end of the 3rd electric capacity C3, the second inductance altogether
The first end of L2, second end of the first electric capacity C1, the first end of the second electric capacity C2, second end of first resistor R1 and second resistance
The first end of R2 is connected to second end of the first inductance L1, second end of the second inductance L2, second end of the second electric capacity C2 and altogether
Second end of two resistance R2 is connected to the first input end of common mode inductance L7, second end of the 3rd fuse F3, the 4th electric capacity C4 altogether
The first end of first end, the first end of 3rd resistor R3 and the 3rd inductance L3 be connected to second end of the 3rd electric capacity C3, the 4th altogether
It is second defeated that second end at second end of electric capacity C4, second end of 3rd resistor R3 and the 3rd inductance L3 is connected to common mode inductance L7 altogether
Enter end, first output end of common mode inductance L7, the first end of the 4th inductance L4, the first end of the 4th resistance R4 and the 5th electric capacity C5
First end connect altogether as the first test side of LC filter units 100, second output end of common mode inductance L7, the 6th inductance L6
The first end of first end, the first end of the 6th resistance R6 and the 8th electric capacity C8 connects as the second detection of LC filter units 100 altogether
End, second end of the 4th inductance L4, second end of the 4th resistance R4 and second end of the 5th electric capacity C5 connect filter single as LC altogether
First output end of unit 100, second end at second end, second end of the 6th resistance R6 and the 8th electric capacity C8 of the 6th inductance L6 is total to
Connect as the second output end of LC filter units 100.
First fuse F1, the second fuse F2 and the 3rd fuse F3 are used to realize overcurrent protection.First inductance L1,
Two inductance L2, the first electric capacity C1, the second electric capacity C2, first resistor R1, second resistance R2, the 3rd electric capacity C3, the 4th electric capacity C4,
Three resistance R3 and the 3rd inductance L3 constitute input matched filtering circuit, to the high-frequency ac electric signal or low-frequency ac telecommunications that are input into
Number it is filtered；When input is for high-frequency ac electric signal, filter circuit is constituted (for example, passing through first by electric capacity and resistance
Electric capacity C1, the second electric capacity C2, first resistor R1 and second resistance R2 constitute filter circuit), high-frequency ac electric signal is filtered
Ripple；When input is for low-frequency ac electric signal, filter circuit is constituted (such as by the first inductance L1, the by inductance and resistance
Two inductance, first resistor R1 and second resistance R2 constitute filter circuit), low-frequency ac electric signal is filtered.Common mode inductance
L7 is used to filter the electromagnetic interference signal of common mode in filtered high-frequency ac electric signal or low-frequency ac electric signal.The
Four inductance L4, the 4th resistance R4, the 5th electric capacity C5 and the 6th inductance L6, the 6th resistance R6, the 8th electric capacity C8 respectively constitute difference
Mould filter circuit, the electromagnetic interference signal to differential mode in filtered high-frequency ac electric signal or low-frequency ac electric signal is filtered
Remove.
In the utility model embodiment, when LED drive circuit is used under electron rectifier input, can be according to electricity
The model of sub- rectifier is chosen to the induction reactance of the 4th inductance L4, i.e., realize LED by adjusting the induction reactance of the 4th inductance L4
Drive circuit solves the compatibility existing for existing LED drive circuit and receives to the compatibility of the electron rectifier of unlike signal
The problem of limit.And the peak current when start is used under electron rectifier is input into can effectively be reduced by the 3rd electric capacity C3.
Rectifying bridge unit 101 is used to carry out rectification to filtered high-frequency alternating current or low frequency ac, and exports high frequency
Direct current or low-frequency d electric signal, it can be the conventional bridge rectifier being made up of multiple diodes.
Used as one embodiment of the invention, π types filter unit 102 includes the 5th inductance L5, the 5th resistance R5, the 6th electric capacity C6
And the 7th electric capacity C7.
The first end of the 5th inductance L5, the first end of the 5th resistance R5 and the first end of the 6th electric capacity C6 connect as π types altogether
The first input end of filter unit 102, the of second end of the 5th inductance L5, second end of the 5th resistance R5 and the 7th electric capacity C7
One end connects the output end as π types filter unit 102 altogether, and the second end and second end of the 7th electric capacity C7 of the 6th electric capacity C6 connect altogether
It is connected to altogether with second end of the 7th electric capacity C7 as the second end of the second input of π types filter unit 102, and the 6th electric capacity C6
Ground.
Used as the embodiment of the utility model one, high frequency sampling unit 200 includes the 9th electric capacity C9, the tenth electric capacity C10 and the
Seven resistance R7.
It is first defeated that the first end of the 9th electric capacity C9 and the first end of the tenth electric capacity C10 are respectively high frequency sampling unit 200
Enter end and the second input, second end of the 9th electric capacity C9 connects as high frequency sampling unit altogether with the first end of the 7th resistance R7
200 the first output end, second end of the tenth electric capacity C10 connects as high frequency sampling unit altogether with second end of the 7th resistance R7
200 the second output end.
In the utility model embodiment, only high-frequency ac electric signal just can be by the 9th electric capacity C9 and the tenth electric capacity
C10, and low frequency ac cannot then pass through.
Used as the embodiment of the utility model one, voltage regulation unit 202 includes：Tenth resistance R10, the 11st resistance R11, the tenth
Two electric capacity C12, the 13rd electric capacity C13, the 12nd resistance R12, the 14th electric capacity C14, the 13rd resistance R13, the second voltage stabilizing two
Pole pipe ZD2, the 7th diode D7, the 15th electric capacity C15 and the 14th resistance R14.
The first end of the tenth resistance R10, the first end of the 11st resistance R11, first end, the tenth of the 12nd electric capacity C12
The first end of three electric capacity C13 and the first end of the 12nd resistance R12 connect the positive input terminal as voltage regulation unit 202, the 12nd altogether
Second end of resistance R12, the first end of the 14th electric capacity C14, the first end of the 13rd resistance R13 and the second voltage-regulator diode
The negative pole of ZD2 is connected to the positive pole of the 7th diode D7 altogether, the negative pole of the 7th diode D7, the first end of the 15th electric capacity C15 and
The first end of the 14th resistance R14 connects the output end as voltage regulation unit 202, second end of the tenth resistance R10, the 11st electricity altogether
Hinder the second end, second end of the 12nd electric capacity C12, second end of the 13rd electric capacity C13, the second of the 14th electric capacity C14 of R11
End, second end of the 13rd resistance R13, the positive pole of the second voltage-regulator diode ZD2, second end and the tenth of the 15th electric capacity C15
Second end of four resistance R14 connects the negative input end as voltage regulation unit 202, and second end of the tenth resistance R10, the 11st electricity altogether
Hinder the second end, second end of the 12nd electric capacity C12, second end of the 13rd electric capacity C13, the second of the 14th electric capacity C14 of R11
End, second end of the 13rd resistance R13, the positive pole of the second voltage-regulator diode ZD2, second end and the tenth of the 15th electric capacity C15
Second end of four resistance R14 connects be connected to ground altogether as the negative input end of voltage regulation unit 202 altogether.
Used as the embodiment of the utility model one, open-circuit-protection unit 201 includes：Controllable silicon Q1, the 8th resistance R8, the 11st
Electric capacity C11, the 9th resistance R9 and the first voltage-regulator diode ZD1.
The hot end of controllable silicon Q1 is the positive input terminal of open-circuit-protection unit 201, the cold end of controllable silicon Q1, the 8th
The first end of the first end of resistance R8 and the 11st electric capacity C11 connects the negative input end as open-circuit-protection unit 201, controllable silicon altogether
Second end of the control end of Q1, second end of the 8th resistance R8 and the 11st electric capacity C11 is connected to second end of the 9th resistance R9 altogether,
The first end of the 9th resistance R9 is connected with the positive pole of the first voltage-regulator diode ZD1, and the negative pole of the first voltage-regulator diode ZD1 is open circuit
The output end of protection location 201.
In the utility model embodiment, when load open circuit, open-circuit-protection unit 201 is steady by controllable silicon Q1 and first
Pressure pipe ZD1 realizes open-circuit-protection.Specifically, when load open circuit, the high pressure of rectifier U2 outputs can rapidly puncture the first voltage stabilizing
Pipe ZD1 reaches controllable silicon Q1 through the 9th resistance R9 so that controllable silicon Q1 fast conductings, so as to export rectifying bridge unit 101
Conduction voltage drop of the voltage stabilization in controllable silicon Q1, it is ensured that LED drive circuit is not burned.
Used as the embodiment of the utility model one, shut-off control unit 203 includes：5th diode D5 and second switch pipe
Q2。
The input for just extremely turning off control unit 203 of the 5th diode D5, the negative pole and second of the 5th diode D5
The control end connection of switching tube Q2, the hot end of second switch pipe Q2 is the output end for turning off control unit 203, second switch
The cold end ground connection of pipe Q2.
In the utility model embodiment, second switch pipe Q2 can be the second NMOS tube, the grid of the second NMOS tube, leakage
Pole and source electrode are respectively control end, hot end and the cold end of second switch pipe Q2.Certainly, second switch pipe Q2 can be with
It is the switching devices such as triode, insulated gate bipolar transistor (InsulatedGate Bipolar Transistor, IGBT),
It is configured with specific reference to actual demand, is not limited herein.
Used as the embodiment of the utility model one, the second control unit 204 includes：6th diode D6 and the 3rd switching tube
Q3。
The just extremely input of the second control unit 204, the negative pole and the 3rd of the 6th diode D6 of the 6th diode D6
The control end connection of switching tube Q3, the hot end of the 3rd switching tube Q3 is the output end of the second control unit 204, the 3rd switch
The cold end ground connection of pipe Q3.
3rd switching tube Q3 can be the 3rd NMOS tube, and the grid of the 3rd NMOS tube, drain electrode and source electrode are respectively the 3rd and open
Close control end, hot end and the cold end of pipe Q3.Certainly, the 3rd switching tube Q3 can also be triode, insulated gate bipolar
The switching devices such as transistor npn npn (Insulated Gate Bipolar Transistor, IGBT), enter with specific reference to actual demand
Row is set, and is not limited herein.
Used as the embodiment of the utility model one, civil power input control module 30 includes：17th resistance R17, the 18th electricity
Resistance R18, the 19th resistance R19, the 20th resistance R20, the first diode D1, the 20th electric capacity C20, the 21st electric capacity C21,
15th resistance R15, the 16th resistance R16, the 16th electric capacity C16, the 17th electric capacity C17, driving chip U1, the 21st electricity
Resistance R21, the 4th diode D4, the 18th electric capacity C18, the 22nd resistance R22, the 23rd resistance R23, the 24th resistance
R24, the 25th resistance R25 and the 26th resistance R26.
The first end of the 17th resistance R17 is the input of civil power input control module 30, the second of the 17th resistance R17
End is connected with the first end of the 18th resistance R18, and second end of the 18th resistance R18 connects with the first end of the 19th resistance R19
Connect, second end of the 19th resistance R19, the first end of the 20th electric capacity C20, first end, the 20th of the 21st electric capacity C21
The first end of the first end of resistance R20 and the 17th electric capacity R17 is connected to the power end VDD of driving chip U1, driving chip U1 altogether
Power end VDD be the controlled end of civil power input control module, second end of the 12nd electric capacity C20 and the 21st electric capacity C21
The second end be connected to ground altogether, second end of the 20th resistance R20 is connected with the negative pole of the first diode D1, the first diode D1's
The first end of positive pole and the 15th resistance R15 connects the voltage input end as civil power input control module, the 15th resistance R15 altogether
The second end, the first end of the 16th electric capacity C16 and the first end of the 16th resistance R16 be connected to the feedback pin of driving chip U1 altogether
Second end of FB, the 16th electric capacity C16, second end of the 16th resistance R16, second end of the 17th electric capacity C17 and drive core
The lower margin GND of piece U1 is connected to ground altogether, and the comparing pin COMP of driving chip U1 is connected with the first end of the 18th electric capacity C18, and the tenth
The second end ground connection of eight electric capacity C18, the first end of the 21st resistance R21 is connected to driving core altogether with the negative pole of the 4th diode D4
The gate pin GATE of piece U1, the positive pole of the 4th diode D4 is connected with the first end of the 22nd resistance R22, the 22nd resistance
Second end of R22, second end of the 21st resistance R21 and the first end of the 24th resistance R24 connect be input into as civil power altogether
The control end of control module 30, the first end of the 23rd resistance R23 is connected with the Enable Pin of driving chip U1, the 23rd electricity
Hinder the second end, second end of the 24th resistance R24, the first end of the 25th resistance R25 and the 26th resistance of R23
The first end of R26 connects the sampling end as civil power input control module 30, second end and the 20th of the 25th resistance R25 altogether
Second end of six resistance R26 is connected to ground altogether.
The LED drive circuit that the utility model is provided is described further below in conjunction with operation principle：
As shown in figure 3, when the input of LED drive circuit connects civil power, by the alternating current that civil power is provided is frequency
Rate for 50HZ or 60HZ low frequency ac, therefore, the low frequency ac cannot by the 9th electric capacity C19 and the tenth electric capacity C10,
Electron rectifier input control module 20 cannot normal work.Now, low frequency ac is converted to low frequency by rectifying bridge unit 101
Direct current, π types filter unit 102 is filtered to the AC compounent in low-frequency d electricity, and by low-frequency d electricity output to city
Electric input control module 30 and VRM Voltage Regulator Module 40, now, the 17th resistance R17, the 18th resistance R18, the 19th resistance
R19 and the 20th electric capacity C20 carry out partial pressure to low-frequency d electricity so that the voltage of the supply pin VDD of driving chip U1 is normal
In the range of, driving chip U1 normal works, the gate pin GATE output pulse signals of driving chip U1, with to the 4th switching tube Q4
Carry out switching off and on control.When the 4th switching tube Q4 is turned on, armature winding, fourth switching tube of the electric current by transformer T1
Q4 flows into ground；When the 4th switching tube Q4 is turned off, armature winding, threeth diode D3 inflow LED of the electric current through transformer T1
Positive pole LED+ formed loop, to realize the drive control to LED.
When the input of LED drive circuit connects electron rectifier, because the alternating current of electron rectifier output is frequency
Rate is the high-frequency alternating current of 40KHZ~70KHZ, therefore, the high-frequency alternating current can be by the 9th electric capacity C19 and the tenth electric capacity
C10, the high frequency sampling unit 200 being made up of the 9th electric capacity C19, the tenth electric capacity C10 and the 7th resistance R7 enters to high-frequency alternating current
Filtered high-frequency alternating current is converted to high-frequency DC by row filtering process, rectifier U2, and the high-frequency DC is through the 12nd
The output extremely shut-off control unit 204 of control unit 203 and second after resistance R12 and the 13rd resistance R13 partial pressures and voltage stabilizing, this
When, the grid of second switch pipe Q2 and the 3rd switching tube Q3 is high level, and second switch pipe Q2 and the 3rd switching tube Q3 is turned on,
The voltage of the supply pin VDD of driving chip U1 is pulled down to ground by second switch pipe Q2, and driving chip U1 is stopped, the 4th switch
Pipe Q4 is constantly in off state.Meanwhile, the negative pole LED- of LED is pulled down to ground by the 3rd switching tube Q3.Rectifying bridge unit 101
High-frequency alternating current is converted into high-frequency DC, after π types filter unit 102 is filtered to high-frequency DC, the high-frequency direct-current
The positive pole LED+ that electricity directly flows into LED by the armature winding of transformer T1, the 3rd diode D3 forms loop, with to LED
Lamp is driven control.When load open circuit, the high pressure of rectifier U2 outputs can rapidly puncture the first voltage-stabiliser tube ZD1 through the 9th electricity
Resistance R9 reaches controllable silicon Q1 so that controllable silicon Q1 fast conductings, so as to the voltage stabilization for exporting rectifying bridge unit 101 is controllable
The conduction voltage drop of silicon Q1, it is ensured that LED drive circuit is not burned
In the utility model embodiment, the second diode D2 is connected in the negative pole LED- of LED, using the forward direction of diode
Conducting, the reversely feature of cut-off, it is to avoid the electric current of the output of VRM Voltage Regulator Module 40 flows back to π types filter unit 102 and leads again
Cause causes the short circuit of LED.
In the utility model embodiment, LED drive circuit pair can be caused by the parameter for adjusting LC filter units 100
Electron rectifier it is compatible stronger.
The utility model embodiment additionally provides a kind of LED light device, the LED light device include LED and on
State the LED drive circuit of embodiment.
The utility model embodiment includes that input module, rectifier input control module, civil power are input into control by using
The LED drive circuit of module, VRM Voltage Regulator Module and output module, the low-frequency ac of city's electricity output is being received by input module
When electric, rectifying and wave-filtering treatment is carried out to low frequency ac, and output low frequency direct current to civil power input control module and voltage is adjusted
Section module；Started working under the driving of low-frequency d electricity by civil power input control module, and control voltage adjustment module is exported
The low-frequency d electricity of voltage constant, to be driven control to LED；Input mould is being detected by rectifier input control module
Control civil power input control module is stopped when block receives the high-frequency alternating current of electron rectifier output, by input module pair
High-frequency alternating current carries out rectifying and wave-filtering treatment, and exports high-frequency DC to VRM Voltage Regulator Module, by VRM Voltage Regulator Module by height
Frequency direct current is exported to LED by output module, to be driven control to LED, so that the circuit can be simultaneously simultaneous
Hold electron rectifier input and civil power input, and due to tapped buck-boost module centered on VRM Voltage Regulator Module, therefore, it is whole
The harmonic distortion of individual circuit is relatively low, and conversion efficiency is higher.
Preferred embodiment of the present utility model is the foregoing is only, is not used to limit the utility model, it is all at this
Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
1. a kind of LED drive circuit, is connected with LED, it is characterised in that the LED drive circuit includes：Compatible civil power and electricity
Input module, rectifier input control module, civil power input control module, VRM Voltage Regulator Module and output that sub- rectifier is input into
Module；Tapped buck-boost module centered on the VRM Voltage Regulator Module；
The input of the input module is the input of the LED drive circuit, the inspection of the rectifier input control module
Survey end, the first control end and the second control end test side respectively with the input module, the civil power input control module
The negative pole connection of controlled end and the LED, the input and control end of the civil power input control module is defeated with described respectively
Enter the controlled end connection of the output end and the VRM Voltage Regulator Module of module, the input of the VRM Voltage Regulator Module is defeated with described
The output end for entering module is connected to the isolation end of the output module, the output end of the VRM Voltage Regulator Module and the output mould altogether
Second output end of block is connected to the positive pole of the LED, the first output end of the output module and the negative pole of the LED altogether
Connection；
If the input module receives the low frequency ac of city's electricity output, the input module enters to the low frequency ac
The treatment of row rectifying and wave-filtering, and output low frequency direct current is to the civil power input control module and the VRM Voltage Regulator Module；It is described
Civil power input control module is started working under the driving of low-frequency d electricity, and controls the VRM Voltage Regulator Module output electricity
The constant low-frequency d electricity of pressure, control is driven with to the LED；
If detecting the high-frequency alternating current that the input module receives electron rectifier output, the rectifier input control
Module controls the civil power input control module to be stopped, and the negative pole of the LED is connected to the ground；The input module
Rectifying and wave-filtering treatment is carried out to the high-frequency alternating current, and exports high-frequency DC to the VRM Voltage Regulator Module；The voltage
The high-frequency direct-current electricity output to the LED is driven control by adjustment module with to the LED.
2. LED drive circuit as claimed in claim 1, it is characterised in that the input module includes LC filter units, rectification
Bridge unit and π type filter units；
The input of the LC filter units is the input of the input module, the first test side of the LC filter units and
Second test side constitutes the test side of the input module, and the first output end of the LC filter units and the second output end are distinguished
It is connected with the first input end and the second input of the rectifying bridge unit, the positive output end and negative output of the rectifying bridge unit
End is connected with the positive input terminal end of the π types filter unit and negative input end respectively, and the output end of the π types filter unit is institute
State the output end of input module.
3. LED drive circuit as claimed in claim 2, it is characterised in that the rectifier input control module includes high frequency
Sampling unit, rectifier, voltage regulation unit, shut-off control unit and the second control unit；
The first input end of the high frequency sampling unit and the second input constitute the detection of the rectifier input control module
End, and the high frequency sampling unit first input end and the second input respectively with the first test side of the LC filter units
With the connection of the second test side, first output end and the second output end of the high frequency sampling unit are respectively with the of the rectifier
One input and the second input are connected, and the positive output end and negative output terminal of the rectifier are respectively with the voltage regulation unit just
Input and negative input end are connected, the output end of the voltage regulation unit simultaneously with the input of the shut-off control unit and described
The input connection of the second control unit, the output end of the shut-off control unit and the output end point of second control unit
Not Wei the rectifier input control module the first control end and the second control end.
4. LED drive circuit as claimed in claim 3, it is characterised in that the rectifier input control module also includes opening
Road protection location；
The positive input terminal and negative input end of the open-circuit-protection unit respectively with the positive output end of the rectifying bridge unit and negative defeated
Go out end connection, the output end of the open-circuit-protection unit is connected with the positive output end of the rectifier.
5. LED drive circuit as claimed in claim 1, it is characterised in that the sampling end and voltage of the VRM Voltage Regulator Module
Output end is connected with the sampling end and voltage input end of the civil power input control module respectively；The VRM Voltage Regulator Module includes
Transformer, the 3rd diode, the 4th switching tube and the 19th electric capacity；
First different name end of the armature winding of the transformer is the input of the VRM Voltage Regulator Module, the armature winding
The of second different name end, the Same Name of Ends of the armature winding, the hot end of the 4th switching tube and the 19th electric capacity
One end is connected to the positive pole of the 3rd diode altogether, and the negative pole of the 3rd diode is the output of the VRM Voltage Regulator Module
End, the Same Name of Ends of the secondary windings of the transformer is the voltage output end of the VRM Voltage Regulator Module, the secondary windings
Different name end is grounded, and the control end of the 4th switching tube is the controlled end of the VRM Voltage Regulator Module, the 4th switching tube
Cold end connects the sampling end as the VRM Voltage Regulator Module with the second end of the 19th electric capacity altogether.
6. LED drive circuit as claimed in claim 1, it is characterised in that the output module includes：Second diode,
22 electric capacity, the 23rd electric capacity, the 24th electric capacity and the 27th resistance；
The negative pole of second diode is the isolation end of the output module, the positive pole of second diode, described second
The negative pole of 12 electric capacity, the first end of the 23rd electric capacity, the first end and the described 20th of the 24th electric capacity
The first end of seven resistance connects as the first output end of the output module, the positive pole of the 22nd electric capacity, described altogether
Second end of the second end of 23 electric capacity and the 27th resistance connects as the second output end of the output module altogether,
The second end ground connection of the 24th electric capacity.
7. LED drive circuit as claimed in claim 2, it is characterised in that the LC filter units include：First fuse,
Second fuse, the 3rd fuse, the first inductance, the second inductance, the first electric capacity, the second electric capacity, first resistor, second resistance,
3rd electric capacity, the 4th electric capacity, 3rd resistor, the 3rd inductance, common mode inductance, the 4th inductance, the 4th resistance, the 5th electric capacity, the 6th
Inductance, the 6th resistance and the 8th electric capacity；
The first end of the first end of first fuse, the first end of second fuse and the 3rd fuse is constituted
The input of the LC filter units, the second end of first fuse, the second end of second fuse, described first
The first end of the first end of inductance, the first end of first electric capacity and the first resistor is connected to the of the 3rd electric capacity altogether
One end, the first end of second inductance, the second end of first electric capacity, the first end of second electric capacity, described first
Second end of resistance and the first end of the second resistance are connected to the second end of first inductance, the of second inductance altogether
Second end at two ends, the second end of second electric capacity and the second resistance is connected to the first input of the common mode inductance altogether
End, the second end of the 3rd fuse, the first end of the 4th electric capacity, the first end of the 3rd resistor and the described 3rd
The first end of inductance is connected to the second end of the 3rd electric capacity, the second end of the 4th electric capacity, the of the 3rd resistor altogether
Second end of two ends and the 3rd inductance is connected to the second input of the common mode inductance altogether, and the first of the common mode inductance is defeated
Go out end, the first end of the 4th inductance, the first end of the 4th resistance and the first end of the 5th electric capacity and connect conduct altogether
First test side of the LC filter units, it is the second output end of the common mode inductance, the first end of the 6th inductance, described
The first end of the first end of the 6th resistance and the 8th electric capacity connects the second test side as the LC filter units altogether, described
Second end at the second end of the 4th inductance, the second end of the 4th resistance and the 5th electric capacity connects filtered as the LC altogether
First output end of unit, the of the second end of the 6th inductance, the second end of the 6th resistance and the 8th electric capacity
Two ends connect the second output end as the LC filter units altogether.
8. LED drive circuit as claimed in claim 3, it is characterised in that the shut-off control unit includes：5th diode
With second switch pipe；
5th diode just extremely it is described shut-off control unit input, the negative pole of the 5th diode with it is described
The control end connection of second switch pipe, the hot end of the second switch pipe is the output end of the shut-off control unit, institute
State the cold end ground connection of second switch pipe.
9. LED drive circuit as claimed in claim 3, it is characterised in that second control unit includes：6th diode
With the 3rd switching tube；
The input of just extremely described second control unit of the 6th diode, the negative pole of the 6th diode with it is described
The control end connection of the 3rd switching tube, the hot end of the 3rd switching tube is the output end of second control unit, institute
State the cold end ground connection of the 3rd switching tube.
10. a kind of LED light device, including LED, it is characterised in that the LED light device includes such as claim 1 to 9
LED drive circuit described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621412160.8U CN206314031U (en) | 2016-12-21 | 2016-12-21 | A kind of LED drive circuit and LED light device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621412160.8U CN206314031U (en) | 2016-12-21 | 2016-12-21 | A kind of LED drive circuit and LED light device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206314031U true CN206314031U (en) | 2017-07-07 |
Family
ID=59247204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621412160.8U Active CN206314031U (en) | 2016-12-21 | 2016-12-21 | A kind of LED drive circuit and LED light device |
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| Country | Link |
|---|---|
| CN (1) | CN206314031U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109526093A (en) * | 2018-03-26 | 2019-03-26 | 漳州立达信灯具有限公司 | LED light tube drive circuit and LED illumination device |
| CN110708791A (en) * | 2019-10-17 | 2020-01-17 | 深圳市豪恩智能物联股份有限公司 | Lamp tube driving circuit compatible with electronic rectifier and mains supply and lamp |
-
2016
- 2016-12-21 CN CN201621412160.8U patent/CN206314031U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109526093A (en) * | 2018-03-26 | 2019-03-26 | 漳州立达信灯具有限公司 | LED light tube drive circuit and LED illumination device |
| CN110708791A (en) * | 2019-10-17 | 2020-01-17 | 深圳市豪恩智能物联股份有限公司 | Lamp tube driving circuit compatible with electronic rectifier and mains supply and lamp |
| CN110708791B (en) * | 2019-10-17 | 2024-02-09 | 深圳市豪恩智能物联股份有限公司 | Lamp tube driving circuit compatible with electronic rectifier and mains supply and lamp |
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Address after: 518000 Longhua New District, Shenzhen, Guangdong, Da wave Street Da wave office, Tong Sheng Industrial Park Road, Horne Science Park, building A two floor, C area, middle and southern section of B District Patentee after: Shenzhen haoen intelligent joint Limited by Share Ltd Address before: 518000 Longhua New District, Shenzhen, Guangdong, Da wave Street Da wave office, Tong Sheng Industrial Park Road, Horne Science Park, building A two floor, C area, middle and southern section of B District Patentee before: SHENZHEN HORN PHOTOELECTRIC LIGHTING CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |