CN209435491U - A kind of twin voltage LED drive circuit and driving device - Google Patents
A kind of twin voltage LED drive circuit and driving device Download PDFInfo
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- CN209435491U CN209435491U CN201821746842.1U CN201821746842U CN209435491U CN 209435491 U CN209435491 U CN 209435491U CN 201821746842 U CN201821746842 U CN 201821746842U CN 209435491 U CN209435491 U CN 209435491U
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Abstract
The utility model discloses a kind of twin voltage LED drive circuit and driving devices, the twin voltage LED drive circuit is connect with two paths of LED lamp string, including voltage detection module, current control module, switch module, the first light modulation constant flow module and the second light modulation constant flow module；Current input voltage size is detected by voltage detection module and exports corresponding voltage range and judges signal to switch module and current control module, while also output sampled voltage is to current control module；Switch module judges the connection relationship of signal control two paths of LED lamp string according to voltage range；Current control module judges that signal and sampled voltage output have the dim signal of corresponding line voltage compensation information to the first light modulation constant flow module and the second light modulation constant flow module according to voltage range, adjusts the electric current of two paths of LED lamp string according to dim signal by the first light modulation constant flow module and the second light modulation constant flow module.Two high voltage switching modules are eliminated, the design of driving circuit is simplified, reduces product cost.
Description
Technical field
The utility model relates to LED technology field, in particular to a kind of twin voltage LED drive circuit and driving device.
Background technique
Currently used network voltage has 120V and two kinds of 220V, but is directed to the compensation of the line voltage compensation of two kinds of power grids
Coefficient is inconsistent.The switch module that existing scheme generally passes through increase periphery in order to adapt to two kinds of network voltages changes sampling
Resistance, to change penalty coefficient, as depicted in figs. 1 and 2, the program is needed using three high voltage switching modules, and
Each drive module requires a set of line voltage compensation circuit, causes whole driving circuit at high cost.
Thus the prior art could be improved and improve.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide a kind of twin voltage LED drivings
Circuit and driving device not only realize adaptive two kinds of voltage ranges, carry out corresponding line voltage for different network voltages
Compensation, also eliminate two high voltage switching modules, simplify the design of twin voltage driving circuit, effectively reduce driving circuit at
This.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of twin voltage LED drive circuit, connect with two paths of LED lamp string, and the twin voltage LED drive circuit includes electricity
Press detection module, current control module, switch module, the first light modulation constant flow module and the second light modulation constant flow module；It is examined by voltage
Surveying module and detecting current input voltage size and export corresponding voltage range judges signal to switch module and current control
Module, while sampled voltage is also exported to current control module；The switch module judges signal control according to the voltage range
The connection relationship of two paths of LED lamp string processed；The current control module judges that signal and sampled voltage are defeated according to the voltage range
The dim signal of corresponding line voltage compensation information is provided to the first light modulation constant flow module and the second light modulation constant flow module, by described
First light modulation constant flow module and the second light modulation constant flow module adjust the electric current of two paths of LED lamp string according to the dim signal.
In the twin voltage LED drive circuit, the voltage detection module includes divider filter unit and comparing unit；
Sampled voltage is exported to the electricity after being divided and be filtered by line voltage of the divider filter unit to rectification output
Flow control module and comparing unit；The sampled voltage is compared with the first reference voltage by the comparing unit, works as institute
The first level is exported to switch module and current control module when stating sampled voltage greater than the first reference voltage；When the sampling electricity
Second electrical level is exported when pressure is less than the first reference voltage to switch module and current control module.
In the twin voltage LED drive circuit, the switch module is specifically used for the control when receiving the first level
It is in parallel to control two paths of LED lamp string when receiving second electrical level for the series connection of two paths of LED lamp string.
In the twin voltage LED drive circuit, the current control module is specifically used for when receiving the first level
0V dim signal is exported to the first light modulation constant flow module, and according to the sampled voltage and preset First Line voltage compensation coefficient
The first dim signal is exported to the second light modulation constant flow module；When receiving second electrical level according to the sampled voltage and in advance
If the second line voltage compensation coefficient export the second dim signal to first light modulation constant flow module and second light modulation constant flow module.
In the twin voltage LED drive circuit, the divider filter unit includes first resistor, second resistance and first
Capacitor, the comparing unit include comparator；One end connecting line voltage input end of the first resistor, the first resistor
The other end connect one end of second resistance, one end of first capacitor, comparator non-inverting input terminal and current control module, it is described
The other end of second resistance and the other end of first capacitor are grounded；The inverting input terminal connection first of the comparator is with reference to electricity
Press input terminal, the output end connection switch module and current control module of the comparator.
In the twin voltage LED drive circuit, the twin voltage LED drive circuit includes first diode, described to open
Closing module includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the second diode, 3rd resistor and zener diode；First metal-oxide-semiconductor
Grid connects the output end of the comparing unit, one end of the drain electrode connection 3rd resistor of first metal-oxide-semiconductor, zener diode
Cathode and the second metal-oxide-semiconductor grid；The source electrode of first metal-oxide-semiconductor is grounded；The other end of the 3rd resistor and the 2nd MOS
The drain electrode of pipe is all connected with line voltage input terminal, and the source electrode of second metal-oxide-semiconductor connects the anode of the second diode；Described 2nd 2
Anode, the cathode of first diode and the anode of the second LED light string of the cathode connection zener diode of pole pipe；Described 1st
The cathode and the first light modulation constant flow module of anode the first LED light string of connection of pole pipe.
In the twin voltage LED drive circuit, the twin voltage LED drive circuit includes first diode, described to open
Closing module includes phase inverter, the 4th resistance and optocoupler；The input terminal of the phase inverter connects the output end of the comparing unit, institute
The output end for stating phase inverter connects the 1st end of optocoupler by the 4th resistance；2nd end of the optocoupler is grounded, the optocoupler
The 3rd end connecting line voltage input end, the optocoupler the 4th end connection first diode cathode and the second LED light string just
Pole；The cathode and the first light modulation constant flow module of anode the first LED light string of connection of the first diode.
In the twin voltage LED drive circuit, the current control module include the first multiplier, the second multiplier,
Subtracter, the first data selector and the second data selector；The input terminal of first multiplier and the second multiplier it is defeated
Enter end and be all connected with the divider filter unit output end, the output end of first multiplier connects the of the first data selector
One input terminal；The output end of second multiplier connects the second input terminal of the first data selector；The first data choosing
The output end for selecting device connects the first input end of the subtracter, the control terminal of first data selector and the choosing of the second data
The control terminal for selecting device is all connected with the output end of the comparing unit；Second input terminal of the subtracter connects the second reference voltage
Input terminal, the output end of the subtracter connect the second input of the second light modulation constant flow module and the second data selector
End；The first input end of second data selector is 0V input terminal, and the output end of second data selector connects institute
State the first light modulation constant flow module.
A kind of twin voltage LED drive device, including shell are provided with pcb board in the shell, are arranged on the pcb board
There is twin voltage LED drive circuit as described above.
Compared to the prior art, in twin voltage LED drive circuit provided by the utility model and driving device, double electricity
Pressure LED drive circuit is connect with two paths of LED lamp string comprising voltage detection module, current control module, switch module, first
Dim constant flow module and the second light modulation constant flow module；Current input voltage size is detected by voltage detection module and output phase is answered
Voltage range judge signal to switch module and current control module, while also output sampled voltage is to current control module；
The switch module judges the connection relationship of signal control two paths of LED lamp string according to the voltage range；The current control mould
Root tuber judges that signal and sampled voltage output have the dim signal of corresponding line voltage compensation information to the according to the voltage range
One light modulation constant flow module and second light modulation constant flow module, by it is described first light modulation constant flow module and second light modulation constant flow module according to
The dim signal adjusts the electric current of two paths of LED lamp string.Adaptive two kinds of voltage ranges are not only realized, for different power grid electricity
Pressure carries out corresponding line voltage compensation, also eliminates two high voltage switching modules, simplifies the design of twin voltage driving circuit, have
Effect reduces driving circuit cost.
Detailed description of the invention
Fig. 1 is the schematic diagram of twin voltage LED drive circuit in the prior art.
Fig. 2 is the circuit diagram of twin voltage LED drive circuit constant flow module in the prior art.
Fig. 3 is the structural block diagram of twin voltage LED drive circuit provided by the utility model.
Fig. 4 is the circuit diagram of the first preferred embodiment of twin voltage LED drive circuit provided by the utility model.
Fig. 5 is the circuit diagram of the second preferred embodiment of twin voltage LED drive circuit provided by the utility model.
Fig. 6 is the flow chart of twin voltage LED driving method provided by the utility model.
Specific embodiment
It needs in view of realizing that twin voltage adaptive LED drives in the prior art using multiple high voltage switching modules, circuit knot
The disadvantages of structure is complicated at high cost, the purpose of this utility model is to provide a kind of twin voltage LED drive circuit and driving devices, no
Adaptive two kinds of voltage ranges are only realized, corresponding line voltage compensation is carried out for different network voltages, also eliminates two
High voltage switching module simplifies the design of twin voltage driving circuit, effectively reduces driving circuit cost.
To keep the purpose of this utility model, technical solution and effect clearer, clear, develop simultaneously implementation referring to the drawings
The utility model is further described in example.It should be appreciated that specific embodiment described herein is only practical to explain
It is novel, it is not used to limit the utility model.
Referring to Fig. 3, twin voltage LED drive circuit provided by the utility model and two paths of LED lamp string, i.e. the first LED light
Go here and there LED1 and the second LED light string LED2 connection comprising voltage detection module 10, current control module 20, switch module 30, the
One light modulation constant flow module 40 and the second light modulation constant flow module 50, the voltage detection module 10 are connect with the output end of rectifier bridge,
The input terminal connection input AC electricity of the rectifier bridge, the voltage detection module 10 are also connected with the switch module 30 and electric current
Control module 20, the switch module 30 is respectively by the first LED light string LED1 connection first light modulation constant flow module 40, by the
Two LED light string LED2 connections second dim constant flow module 50, the first light modulation constant flow module 40 and the second light modulation constant flow module
50 are also connected with the current control module 20.Wherein, current input voltage size is detected by voltage detection module 10 and exported
Corresponding voltage range judge that signal to switch module 30 and current control module 20, while also exporting sampled voltage to electric current control
Molding block 20；The switch module 30 judges the connection relationship of signal control two paths of LED lamp string according to the voltage range；It is described
Current control module 20 judges that signal and sampled voltage output have corresponding line voltage compensation information according to the voltage range
Dim signal is to the first light modulation constant flow module 40 and the second light modulation constant flow module 50, by the first light modulation constant flow module 40 and the
Two light modulation constant flow modules 50 adjust the electric current of two paths of LED lamp string according to the dim signal.
I.e. the utility model detects the line voltage size that current rectifier bridge exports by voltage detection module 10, according to current
Line voltage size exports corresponding voltage range and judges that signal to switch module 30 and current control module 20, is worked as with this to distinguish
The network voltage size of preceding access, while sampled voltage is exported to current control module after also sampling to the line voltage of input
20 provide stable signal for subsequent line voltage compensation, and the switch module 30 judges signal control according to the voltage range later
The connection relationship of two paths of LED lamp string processed, so that LED light string adapts to the network voltage being currently accessed, and passes through current control
Module 20 judges that signal and sampled voltage export two-way dim signal to the first light modulation constant current mould respectively according to the voltage range
Block 40 and the second light modulation constant flow module 50, this two-way dim signal have corresponding line voltage according to the network voltage being currently accessed
Compensated information, so that the first light modulation constant flow module 40 and the second light modulation constant flow module 50 can be according to the light modulations being respectively received
Signal adjusts the electric current of two paths of LED lamp string respectively, i.e., according to different network voltages, controls two paths of LED by switch module 30
While lamp string connection relationship achieves adaptive two kinds of voltage ranges, can also be exported according to different network voltages has not
The dim signal of line voltage compensated information meets the line voltage compensation demand of twin voltage, and without in traditional scheme
Multiple high voltage switching modules, be effectively simplified the design of twin voltage driving circuit, saved circuit cost.
Further, referring to Figure 4 together, the voltage detection module 10 includes divider filter unit 101 and compares single
Member 102, the divider filter unit 101 connect the output end and comparing unit 102 of rectifier bridge, and the comparing unit 102 connects
The switch module 30 and current control module 20, by divider filter unit 101 to rectifier bridge rectification output line voltage into
Output stablizes glitch-free sampled voltage to the current control module 20 and comparing unit 102 after row partial pressure and filtering processing,
The sampled voltage is compared by the comparing unit 102 with the first reference voltage, when the sampled voltage is greater than the first ginseng
The first level is exported when examining voltage to switch module 30 and current control module 20；When the sampled voltage is less than the first reference electricity
Second electrical level is exported when pressure to switch module 30 and current control module 20.I.e. by comparing unit 102 by sampling unit and the
One reference voltage judges the network voltage size being currently accessed more afterwards, when sampled voltage is greater than the first reference voltage, at this time
Network voltage is judged for first voltage (being 220V in the present embodiment), and the voltage range that the comparing unit 102 exports judges letter
Number it is the first level (being high level in the present embodiment), when sampled voltage is less than the first reference voltage, judges power grid electricity at this time
Pressure is second voltage (being 120V in the present embodiment), and the voltage range that the comparing unit 102 exports judges signal for the second electricity
Flat (being low level in the present embodiment), and then different voltage ranges is exported according to the network voltage difference of access and judges signal control
Make the working condition of the switch module 30 and current control module 20.
Wherein, the switch module 30 is specifically used for controlling the series connection of two paths of LED lamp string when receiving the first level, when connecing
Control two paths of LED lamp string is in parallel when receiving second electrical level.When it is implemented, output is extremely when the network voltage of access is 220V
The voltage range of switch module 30 judges signal for high level, and switch module 30 is closed at this time, so that two paths of LED lamp string is connected；
And when the network voltage of access is 120V, it exports to the voltage range of switch module 30 and judges that signal for low level, is opened at this time
It closes module 30 to turn off, so that two paths of LED lamp string is in parallel, that is, passes through the working condition of different level signal control switch modules 30
So that two paths of LED lamp string can connect and automatically switch in parallel connection, the adaptive effect of twin voltage is realized.
Further, the current control module 20 is specifically used for exporting 0V dim signal extremely when receiving the first level
First light modulation constant flow module 40, and believed according to the sampled voltage and the first light modulation of preset First Line voltage compensation coefficient output
Number to it is described second light modulation constant flow module 50；When receiving second electrical level according to the sampled voltage and preset second line electricity
Penalty coefficient is pressed to export the second dim signal to the first light modulation constant flow module 40 and the second light modulation constant flow module 50.
When it is implemented, exporting to the voltage range of current control module 20 and sentencing when the network voltage of access is 220V
Break signal is high level, at this time switch module 30 be closed, two paths of LED lamp string series connection, electric current from rectification bridge output end followed by
To ground after first LED light string LED1 and the second LED light string LED2, therefore two paths of LED lamp string passes through the second light modulation constant flow module
50 carry out brightness adjustment control, and 20 1 tunnel of current control module, which exports 0V dim signal to the first light modulation constant flow module 40, at this time makes it not
Work, another way then export the first dim signal extremely according to current sampled voltage and preset First Line voltage compensation coefficient
The second light modulation constant flow module 50 adjusts the operating current of two paths of LED lamp string by the second light modulation constant flow module 50, wherein the
One line voltage compensation coefficient is the line voltage compensation coefficient of 220V voltage range, realizes the line voltage compensation under 220V voltage；And
When the network voltage of access be 120V when, export to current control module 20 voltage range judge signal for low level, at this time
Switch module 30 turns off, and two paths of LED lamp string is in parallel, and electric current flows separately through the first LED by two branches from rectification bridge output end
To ground after lamp string LED1 and the second LED light string LED2, current control module 20 is according to the sampled voltage and preset the at this time
Two wires voltage compensation coefficient export the second dim signal to first light modulation constant flow module 40 and second light modulation constant flow module 50, i.e., this
When export to first light modulation constant flow module 40 and second light modulation constant flow module 50 two-way dim signal be with the second line electricity
Penalty coefficient is pressed to export the second dim signal, by the first light modulation constant flow module 40 and the second light modulation constant flow module 50 according to described
Second dim signal carries out brightness adjustment control to the first LED light string LED1 and the second LED light string LED2 respectively, wherein the second line voltage
Penalty coefficient is the line voltage compensation coefficient of 120V voltage range, realizes the line voltage compensation under 120V voltage, therefore this is practical
The novel twin voltage that not only realizes adaptively switches, and corresponding line voltage compensation, and nothing can be also carried out for different network voltages
Multiple high-voltage switch gears need to be used, circuit structure is simplified, are conducive to the production efficiency for improving product.
When it is implemented, the divider filter unit 101 includes first resistor R1, second resistance R2 and first capacitor C1,
The comparing unit 102 includes comparator A1；One end connecting line voltage input end of the first resistor R1, the first resistor
R1 the other end connection one end of second resistance R2, one end of first capacitor C1, comparator A1 non-inverting input terminal and electric current control
Molding block 20, the other end of the second resistance R2 and the other end of first capacitor C1 are grounded；The reverse phase of the comparator A1
Input terminal connects the first reference voltage input terminal, the output end connection switch module 30 and current control module of the comparator A1
20。
In the present embodiment, rectifier bridge is exported by first resistor R1, second resistance R2 and first capacitor C1 line voltage
VAC is divided and is filtered, and the voltage of an approximate DC is obtained, which increases with line voltage and increased, and is subtracted with line voltage
Small and reduce, which exports as sampled voltage LVC to current control module 20 and comparator A1, will be adopted by comparator A1
Sample voltage LVC show that voltage range judges signal FLAG220V compared with the first reference voltage Vref 1, it is preferable that specific implementation
When configurable first resistor R1 and second resistance R2 ratio so that LVC=Vref1 can be obtained when line voltage is 170V
When line voltage is greater than 170V, FLAG220V is height, that is, is judged as 220V power grid, and when line voltage is less than 170V, FLAG220V is
It is low, that is, it is judged as 120V power grid, to realize that the voltage range of 120V power grid and 220V power grid judges, certainly in other embodiments
In, the ratio for needing to configure first resistor R1 and second resistance R2 that can also be judged according to voltage range, the utility model is to this
It is not construed as limiting.
Further, as shown in figure 4, in the first preferred embodiment of the utility model, the twin voltage LED drive circuit packet
First diode D1 is included, the switch module 30 includes the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, the second diode D2, third electricity
Hinder R3 and zener diode DZ1；The grid of the first metal-oxide-semiconductor Q1 connects the output end (comparison of the comparing unit 102
The output end of device A1), drain electrode connection one end of 3rd resistor R3 of the first metal-oxide-semiconductor Q1, the cathode of zener diode DZ1 and
The grid of second metal-oxide-semiconductor Q2；The source electrode of the first metal-oxide-semiconductor Q1 is grounded；The other end and the second metal-oxide-semiconductor of the 3rd resistor R3
The drain electrode of Q2 is all connected with line voltage input terminal, and the source electrode of the second metal-oxide-semiconductor Q2 connects the anode of the second diode D2；Described
The cathode of two diode D2 connects the anode of zener diode DZ1, the cathode of first diode D1 and the second LED light string LED2's
Anode；The cathode and the first light modulation constant flow module 40 of the first LED light string LED1 of anode connection of the first diode D1.
The first light modulation constant flow module 40 includes the first operational amplifier A11, the first high-voltage tube M1 and the first sampling electricity
Rcs1 is hindered, the second light modulation constant flow module 50 includes second operational amplifier A12, the second high-voltage tube M2 and the second sampling resistor
Rcs2；The drain electrode of the first high-voltage tube M1 connects the cathode of the first LED light string LED1, the source of the first high-voltage tube M1
Pole connects the inverting input terminal of the first operational amplifier A11 and one end of the first sampling resistor Rcs1, the first high-voltage tube M1
Grid connect the first operational amplifier A11 output end；The other end of the first sampling resistor Rcs1 is grounded；Described first
First output end of the non-inverting input terminal connection current control module 20 of operational amplifier A11；The leakage of the second high-voltage tube M2
Pole connects the cathode of the second LED light string LED2, the source electrode connection second operational amplifier A12's of the second high-voltage tube M2
The grid of one end of inverting input terminal and the second sampling resistor Rcs2, the second high-voltage tube M2 connects second operational amplifier
The output end of A12；The other end of the second sampling resistor Rcs2 is grounded；The homophase input of the second operational amplifier A12
The second output terminal of end connection current control module 20.
In the present embodiment, the switch module 30 passes through the work shape for controlling the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2
State and then the connection relationship for controlling two paths of LED lamp string, specifically, when network voltage is 220V, voltage range judges signal
FLAG220V is high level, i.e. FLAG220V=1, and the first metal-oxide-semiconductor Q1 is connected at this time, the second metal-oxide-semiconductor Q2 cut-off, the first LED light string
LED1 and the second LED light string LED2 is series relationship, only one is from VAC followed by the first LED light string LED1 and second
The branch of GND is arrived after LED light string LED2, current path is VAC-LED1-D1-LED2-M2-Rcs2-GND at this time；When power grid electricity
When pressure is 120V, voltage range judge signal FLAG220V for low level, i.e. FLAG220V=0, the first metal-oxide-semiconductor Q1 cut-off at this time,
Second metal-oxide-semiconductor Q2 conducting, the first LED light string LED1 and the second LED light string LED2 are parallel relationship, and electric current is from VAC through two
Branch respectively flows through the first LED light string LED1 and the second LED light string LED2 to GND, and current path is respectively VAC-LDE1- at this time
M1-Rcs1-GND, VAC-Q2-D2-LED2-M2-Rcs2-GND.
Further, referring to Fig. 5, in the second preferred embodiment of the utility model, the twin voltage LED drive circuit
Including first diode D1, the switch module 30 includes phase inverter U1, the 4th resistance R4 and optocoupler U2；The phase inverter U1's
Input terminal connects the output end of the comparing unit 102, and the output end of the phase inverter U1 passes through the 4th resistance R4 connection
The 1st end of optocoupler U2；The 2nd end of the optocoupler U2 is grounded, the 3rd end connecting line voltage input end of the optocoupler U2, the light
The cathode of the 4th end connection first diode D1 of coupling U2 and the anode of the second LED light string LED2；The first diode D1 is just
Pole connects the cathode and the first light modulation constant flow module 40 of the first LED light string LED1.
I.e. in the present embodiment, on-off action is realized by optocoupler U2, can equally be realized according to the difference of network voltage
The control of two paths of LED lamp string connection relationship, specifically, when input voltage is 220V, FLAG220V=1, optocoupler U2 input terminal is
Low level, the luminescent device inside optocoupler U2 do not shine, and sensor devices are not ended then by illumination, at this time the first LED light string
LED1 connects with the second LED light string LED2；When input voltage is 120V, FLAG220V=0, optocoupler U2 input terminal is high level,
Luminescent device inside optocoupler U2 shines, and sensor devices after illumination by being connected, the first LED light string LED1 and the 2nd LED at this time
Lamp string LED2 is in parallel, to realize lamp string connection relationship switching control, makes two paths of LED lamp string can adaptive twin voltage range work
Make.
Specifically, please continue to refer to Fig. 4 and Fig. 5, in twin voltage LED drive circuit provided by the utility model, the electricity
Flow control module 20 includes the first multiplier P1, the second multiplier P2, subtracter P3, the first data selector Y1 and the second data
Selector Y2；The input terminal of the first multiplier P1 and the input terminal of the second multiplier P2 are all connected with the divider filter unit
The output end of 101 output ends (other end of first resistor R1), the first multiplier P1 connects the first data selector Y1's
First input end；The output end of the second multiplier P2 connects the second input terminal of the first data selector Y1；Described first
The output end of data selector Y1 connects the first input end of the subtracter P3, the control terminal of the first data selector Y1
The output end of the comparing unit 102 is all connected with the control terminal of the second data selector Y2；The second of the subtracter P3 is defeated
Enter the second reference voltage input terminal of end connection, second output terminal of the output end of the subtracter P3 as current control module 20
Connect the second input terminal of the second light modulation constant flow module 50 and the second data selector Y2；The second data selector Y2
First input end be 0V input terminal, the output end of the second data selector Y2 is first defeated as current control module 20
Outlet connection the first light modulation constant flow module 40.
When it is implemented, the multiplication coefficient of the first multiplier P1 is a, the multiplication coefficient of the second multiplier P2 is b,
Middle a is First Line voltage compensation coefficient, i.e. the line voltage compensation coefficient of 220V voltage range, and b is the second line voltage compensation coefficient,
That is the line voltage compensation coefficient of 120V voltage range, 0 < a <b；Current control module 20 is according to the voltage range judgement letter received
Number different line voltage compensation coefficient of FLAG220V signal behavior, when network voltage is 120V, FLAG220V=0, electric current at this time
The output of two-way dim signal Dim1 and Dim2 that control module 20 exports are Vref2-LVC*b, the first LED light string LED1 with
Second LED light string LED2 is in parallel, if Rcs1=Rcs2, Iout1=Iout2=(Vref2-LVC*b)/Rcs2, wherein the second line is electric
Pressure penalty coefficient needs b to meet condition Vref2-LVC*b > 0；When network voltage is 220V, FLAG220V=1, current control at this time
Dim1 exports 0V in the two-way dim signal that module 20 exports, and the output of Dim2 is Vref2-LVC*a, the first LED light string LED1
It connects with the second LED light string LED2, then Iout1=0, Iout2=(Vref2-LVC*a)/Rcs2, it can be seen that, without using height
It can also be realized in the case where the module that compresses switch and use different line voltage compensation coefficients in different operating voltage range, to reach
Pointedly line voltage compensation effect simplifies circuit structure, greatly reduces system cost.
Correspondingly, the utility model also provides a kind of twin voltage LED driving method, as shown in fig. 6, the twin voltage LED
Driving method includes the following steps:
S100, current input voltage size is detected by voltage detection module and exports corresponding voltage range judge signal
To switch module and current control module, while also output sampled voltage is to current control module；
S200, the switch module judge the connection relationship of signal control two paths of LED lamp string according to the voltage range；
S300, the current control module judge that signal and sampled voltage output have corresponding line according to the voltage range
The dim signal of voltage compensation information to the first light modulation constant flow module and second dims constant flow module；
S400, two-way is adjusted according to the dim signal by the first light modulation constant flow module and the second light modulation constant flow module
The electric current of LED light string.
The utility model correspondingly provides a kind of twin voltage LED drive device, including shell, is provided in the shell
Pcb board is provided with the twin voltage LED drive circuit as described above on the pcb board, due to above to described double
Voltage LED drive circuit is described in detail, and and will not be described here in detail.
In conclusion in twin voltage LED drive circuit provided by the utility model and driving device, the twin voltage LED
Driving circuit is connect with two paths of LED lamp string comprising voltage detection module, current control module, switch module, the first light modulation are permanent
Flow module and the second light modulation constant flow module；Current input voltage size is detected by voltage detection module and exports corresponding voltage
Range judges signal to switch module and current control module, while also output sampled voltage is to current control module；It is described to open
Close the connection relationship that module judges signal control two paths of LED lamp string according to the voltage range；The current control module according to
The voltage range judges that signal and sampled voltage output have the dim signal of corresponding line voltage compensation information to the first light modulation
Constant flow module and the second light modulation constant flow module, by the first light modulation constant flow module and the second light modulation constant flow module according to the tune
The electric current of optical signal adjusting two paths of LED lamp string.Adaptive two kinds of voltage ranges are not only realized, are carried out for different network voltages
Corresponding line voltage compensation also eliminates two high voltage switching modules, simplifies the design of twin voltage driving circuit, be effectively reduced
Driving circuit cost.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (9)
1. a kind of twin voltage LED drive circuit, connect with two paths of LED lamp string, which is characterized in that the twin voltage LED driving
Circuit includes voltage detection module, current control module, switch module, the first light modulation constant flow module and the second light modulation constant current mould
Block；Detecting current input voltage size by voltage detection module and exporting corresponding voltage range judges signal to switch module
And current control module, while sampled voltage is also exported to current control module；The switch module is according to the voltage range
Judge the connection relationship of signal control two paths of LED lamp string；The current control module according to the voltage range judge signal and
Sampled voltage output has the dim signal of corresponding line voltage compensation information to the first light modulation constant flow module and the second light modulation constant current
Module adjusts two paths of LED lamp string according to the dim signal by the first light modulation constant flow module and the second light modulation constant flow module
Electric current.
2. twin voltage LED drive circuit according to claim 1, which is characterized in that the voltage detection module includes point
Press filter unit and comparing unit；After being divided and be filtered by line voltage of the divider filter unit to rectification output
Sampled voltage is exported to the current control module and comparing unit；The sampled voltage and first are joined by the comparing unit
It examines voltage to be compared, exports the first level to switch module and electric current control when the sampled voltage is greater than the first reference voltage
Molding block；Second electrical level is exported when the sampled voltage is less than the first reference voltage to switch module and current control module.
3. twin voltage LED drive circuit according to claim 2, which is characterized in that the switch module is specifically used for working as
Control two paths of LED lamp string series connection when receiving the first level, it is in parallel that two paths of LED lamp string is controlled when receiving second electrical level.
4. twin voltage LED drive circuit according to claim 2, which is characterized in that the current control module is specifically used
In exporting 0V dim signal when receiving the first level to the first light modulation constant flow module, and according to the sampled voltage and default
First Line voltage compensation coefficient export the first dim signal to it is described second light modulation constant flow module；When receiving second electrical level
The second dim signal is exported to the first light modulation constant flow module according to the sampled voltage and preset second line voltage compensation coefficient
With the second light modulation constant flow module.
5. twin voltage LED drive circuit according to claim 2, which is characterized in that the divider filter unit includes the
One resistance, second resistance and first capacitor, the comparing unit include comparator；One end of the first resistor connects line voltage
Input terminal, the first resistor the other end connection one end of second resistance, one end of first capacitor, comparator homophase input
End and current control module, the other end of the second resistance and the other end of first capacitor are grounded；The comparator it is anti-
Phase input terminal connects the first reference voltage input terminal, the output end connection switch module and current control module of the comparator.
6. twin voltage LED drive circuit according to claim 2, which is characterized in that the twin voltage LED drive circuit packet
First diode is included, the switch module includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the second diode, 3rd resistor and pressure stabilizing two
Pole pipe；The grid of first metal-oxide-semiconductor connects the output end of the comparing unit, and the drain electrode of first metal-oxide-semiconductor connects third
One end of resistance, the cathode of zener diode and the second metal-oxide-semiconductor grid；The source electrode of first metal-oxide-semiconductor is grounded；The third
The drain electrode of the other end of resistance and the second metal-oxide-semiconductor is all connected with line voltage input terminal, the source electrode connection the two or two of second metal-oxide-semiconductor
The anode of pole pipe；The cathode of second diode connects the cathode and the 2nd LED of the anode of zener diode, first diode
The anode of lamp string；The cathode and the first light modulation constant flow module of anode the first LED light string of connection of the first diode.
7. twin voltage LED drive circuit according to claim 2, which is characterized in that the twin voltage LED drive circuit packet
First diode is included, the switch module includes phase inverter, the 4th resistance and optocoupler；Described in the input terminal connection of the phase inverter
The output end of comparing unit, the output end of the phase inverter connect the 1st end of optocoupler by the 4th resistance；The optocoupler
2nd end ground connection, the 3rd end connecting line voltage input end of the optocoupler, the cathode of the 4th end connection first diode of the optocoupler
With the anode of the second LED light string；The cathode and the first light modulation constant current mould of anode the first LED light string of connection of the first diode
Block.
8. twin voltage LED drive circuit according to claim 2, which is characterized in that the current control module includes the
One multiplier, the second multiplier, subtracter, the first data selector and the second data selector；First multiplier it is defeated
The input terminal for entering end and the second multiplier is all connected with the divider filter unit output end, and the output end of first multiplier connects
Connect the first input end of the first data selector；The second of output end the first data selector of connection of second multiplier is defeated
Enter end；The output end of first data selector connects the first input end of the subtracter, first data selector
Control terminal and the control terminal of the second data selector be all connected with the output end of the comparing unit；The second of the subtracter is defeated
Enter the second reference voltage input terminal of end connection, the output end connection of the subtracter second light modulation constant flow module and the second number
According to the second input terminal of selector；The first input end of second data selector is 0V input terminal, the second data choosing
Select output end connection the first light modulation constant flow module of device.
9. a kind of twin voltage LED drive device, including shell, pcb board is provided in the shell, which is characterized in that the PCB
It is arranged on plate just like twin voltage LED drive circuit described in claim 1-8 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821746842.1U CN209435491U (en) | 2018-10-26 | 2018-10-26 | A kind of twin voltage LED drive circuit and driving device |
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| CN201821746842.1U CN209435491U (en) | 2018-10-26 | 2018-10-26 | A kind of twin voltage LED drive circuit and driving device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109152157A (en) * | 2018-10-26 | 2019-01-04 | 深圳市晟碟半导体有限公司 | A kind of twin voltage LED drive circuit, driving device and driving method |
| CN112654111A (en) * | 2020-12-30 | 2021-04-13 | 上海新进芯微电子有限公司 | LED dimming circuit, LED driving system and electronic equipment |
-
2018
- 2018-10-26 CN CN201821746842.1U patent/CN209435491U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109152157A (en) * | 2018-10-26 | 2019-01-04 | 深圳市晟碟半导体有限公司 | A kind of twin voltage LED drive circuit, driving device and driving method |
| CN112654111A (en) * | 2020-12-30 | 2021-04-13 | 上海新进芯微电子有限公司 | LED dimming circuit, LED driving system and electronic equipment |
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