CN206452581U - A kind of LED drive device and its line voltage compensation circuit - Google Patents
A kind of LED drive device and its line voltage compensation circuit Download PDFInfo
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- CN206452581U CN206452581U CN201720140822.9U CN201720140822U CN206452581U CN 206452581 U CN206452581 U CN 206452581U CN 201720140822 U CN201720140822 U CN 201720140822U CN 206452581 U CN206452581 U CN 206452581U
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Abstract
The utility model discloses a kind of LED drive device and its line voltage compensation circuit, wherein, the line voltage compensation circuit of the LED drive device includes phase time switch module, time voltage modular converter and voltage operational module；The input voltage after being depressured through LED string is sampled by phase time switch module, and corresponding time pulse signal is exported according to sampled voltage；The time pulse signal is converted to corresponding DC voltage to voltage operational module by time voltage modular converter, reference voltage is adjusted according to the DC voltage by voltage operational module and exports amendment voltage to control constant current to drive, constant current drive part is controlled by using the input voltage with amendment, the constant of power is realized.
Description
Technical field
The utility model is related to technical field of LED illumination, more particularly to a kind of LED drive device and its line voltage compensation electricity
Road.
Background technology
Existing linear constant current driving structure is as shown in figure 1, when inputting mains fluctuation, because internal reference is electric
Press constant (as shown in Figure 2), so input current is constant, but be due to input voltage fluctuation, so input power can synchronous hair
Changing, dodges so as to cause whole lamp to there is pressure.Its power is as shown in Figure 3 with line voltage change curve, it may appear that work as line voltage
During increase, its power also can increased phenomenon.
Thus prior art could be improved and improve.
Utility model content
In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model be to provide a kind of LED drive device and
Its line voltage compensation circuit, can obtain the input voltage with amendment to control constant current drive part, realize the constant of power.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of line voltage compensation circuit of LED drive device, it includes phase time switch module, time voltage modulus of conversion
Block and voltage operational module；The input voltage after being depressured through LED string is sampled by phase time switch module, and according to
Sampled voltage exports corresponding time pulse signal；Time voltage modular converter is converted to the time pulse signal corresponding
DC voltage is adjusted and exported to reference voltage according to the DC voltage by voltage operational module to voltage operational module
Voltage is corrected to control constant current to drive.
In the line voltage compensation circuit of described LED drive device, the phase time switch module includes the first partial pressure
Unit, comparing unit and ALU；The input voltage after being depressured through LED string is adopted by the first partial pressure unit
Sample, comparing unit exports corresponding level signal to ALU according to sampled voltage, and ALU is according to described
Level signal exports very first time pulse signal and the second time pulse signal.
In the line voltage compensation circuit of described LED drive device, the time voltage modular converter includes current source, the
One switch element, second switch unit and charge/discharge unit；The first switch unit is closed according to very first time pulse signal
Or disconnect, the second switch unit is closed or disconnected according to the second time pulse signal；
When first switch unit disconnects and second switch unit is closed, current source exports the first electric current to charge/discharge unit
Charging；When first switch unit closure and the disconnection of second switch unit, charge/discharge unit is discharged, and output DC voltage is extremely
Voltage operational module.
In the line voltage compensation circuit of described LED drive device, the voltage operational module includes constant current source unit, electricity
Flow subtracter and the second partial pressure unit；The constant current source unit is described according to corresponding second electric current of the direct voltage output
Second electric current exports the 3rd electric current after current subtractor, and the second partial pressure unit is entered according to the 3rd electric current to reference voltage
Row adjusts and exports amendment voltage.
In the line voltage compensation circuit of described LED drive device, first partial pressure unit includes first resistor, second
Resistance, 3rd resistor and the 4th resistance；The comparing unit includes first comparator, the second comparator and the 3rd comparator；Institute
Stating ALU includes the first NOT gate, the second NOT gate, first and door and second and door；
The first resistor, second resistance, 3rd resistor and the 4th resistance are sequentially connected in series between LED string and ground, institute
The in-phase input end of the midpoint connection first comparator of first resistor and second resistance is stated, the second resistance and 3rd resistor
The midpoint of the in-phase input end of the second comparator of midpoint connection, the 3rd resistor and the 4th resistance connects the same of the 3rd comparator
Phase input, the inverting input of the first comparator, the second comparator and the 3rd comparator is all connected with reference voltage end；Institute
State output end connection first and an input of door for first comparator, the output end connection second of second comparator with
One input of door, another input that first and door are also connected by the first NOT gate, the output of the 3rd comparator
End connects another input of second and door by the second NOT gate；Described first with the output end Connection Time modular converter of door
First input end, described second with the second input of the output end Connection Time voltage transformation module of door.
In the line voltage compensation circuit of described LED drive device, the first switch unit includes the first analog switch,
The second switch unit includes the second analog switch, and the charge/discharge unit includes the first electric capacity；First analog switch
Control end connect the first output end of the ALU, the connection end connection first of first analog switch
One end of electric capacity, a connection end of the second analog switch and the input of voltage operational module, first analog switch
The other end of another connection end and the first electric capacity is grounded；Another connection end of second analog switch passes through current source
VCC feeder ears are connected, the control end of second analog switch connects the second output end of ALU.
In the line voltage compensation circuit of described LED drive device, the constant current source unit includes operational amplifier, first
Metal-oxide-semiconductor and the 5th resistance；The current subtractor includes the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor；Institute
Stating the second partial pressure unit includes the 6th resistance, the 7th resistance and the 8th resistance；The in-phase input end connection of the operational amplifier
The output end of time voltage modular converter, the inverting input of the operational amplifier connects the source electrode and the 5th of the first metal-oxide-semiconductor
One end of resistance, the other end ground connection of the 5th resistance；The output end of the operational amplifier connects the grid of the first metal-oxide-semiconductor
Pole；The drain electrode of first metal-oxide-semiconductor connects the grid of drain electrode, the grid of the second metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor of the second metal-oxide-semiconductor；Institute
The source electrode of the source electrode and the 3rd metal-oxide-semiconductor of stating the second metal-oxide-semiconductor is all connected with VCC feeder ears；The drain electrode connection of 3rd metal-oxide-semiconductor
One end of drain electrode, one end of the 6th resistance and the 7th resistance that 4th MOS is closed；The grid of 4th metal-oxide-semiconductor connects the 5th MOS
The grid of pipe, the drain electrode of the 5th metal-oxide-semiconductor and external current source, the source electrode of the 4th metal-oxide-semiconductor and the source electrode of the 5th metal-oxide-semiconductor connect
Ground；The other end connection reference voltage end of 6th resistance；The other end of 7th resistance passes through the 8th resistance eutral grounding, institute
The midpoint for stating the 7th resistance and the 8th resistance exports the amendment voltage.
In the line voltage compensation circuit of described LED drive device, first metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and the 5th MOS
Manage as N-channel MOS pipe；Second metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor are P-channel metal-oxide-semiconductor.
A kind of LED drive device, including LED string, rectification module and use for carrying out rectification to input AC electricity
In keeping the constant constant-current driven module of input current, it also includes line voltage compensation circuit as described above, for according to defeated
Enter the change output amendment voltage of voltage to constant-current driven module, to keep the constant of power；The input of the rectification module
Alternating current is connected, the output end of the rectification module passes through LED series winding wiring voltage compensating circuit；The line voltage compensation electricity
Road connects constant-current driven module.
It is described in the LED drive device and its line voltage compensation circuit that are provided compared to prior art, the utility model
The line voltage compensation circuit of LED drive device includes phase time switch module, time voltage modular converter and voltage operational mould
Block；The input voltage after being depressured through LED string is sampled by phase time switch module, and phase is exported according to sampled voltage
The time pulse signal answered；The time pulse signal is converted to corresponding DC voltage to voltage by time voltage modular converter
Computing module, is adjusted to reference voltage according to the DC voltage by voltage operational module and exports amendment voltage to control
Constant current is driven, and constant current drive part is controlled by using the input voltage with amendment, the constant of power is realized.
Brief description of the drawings
Fig. 1 is the structured flowchart of LED illumination drive circuit in the prior art.
Fig. 2 is the input line voltage of LED illumination drive circuit in the prior art and reference voltage curve map.
Fig. 3 is the power vs. voltage curve figure of LED illumination drive circuit in the prior art.
The schematic diagram for the LED drive device that Fig. 4 provides for the utility model.
The input line voltage for the LED drive device that Fig. 5 provides for the utility model and sampled voltage curve map.
The electricity of phase time switch module in the line voltage compensation circuit for the LED drive device that Fig. 6 the utility model is provided
Lu Tu.
Phase time switch module is exported in the line voltage compensation circuit for the LED drive device that Fig. 7 the utility model is provided
Time pulse signal schematic diagram.
The electricity of time voltage modular converter in the line voltage compensation circuit for the LED drive device that Fig. 8 the utility model is provided
Lu Tu.
Voltage operational module first is implemented in the line voltage compensation circuit for the LED drive device that Fig. 9 the utility model is provided
The circuit diagram of example.
The amendment V diagram of the line voltage compensation circuit output for the LED drive device that Figure 10 the utility model is provided.
The line voltage compensation circuit power vs. voltage curve figure for the LED drive device that Figure 11 the utility model is provided.
Voltage operational module second is implemented in the line voltage compensation circuit for the LED drive device that Figure 12 the utility model is provided
The circuit diagram of example.
Voltage operational module the 3rd is implemented in the line voltage compensation circuit for the LED drive device that Figure 13 the utility model is provided
The circuit diagram of example.
The flow chart of the line voltage compensation method for the LED drive device that Figure 14 the utility model is provided.
Embodiment
In view of in the prior art when line voltage is fluctuated, the input power of LED drive circuit can produce fluctuation therewith
The shortcomings of, the purpose of this utility model is to provide a kind of LED drive device and its line voltage compensation circuit, can obtain carrying and repair
Positive input voltage controls constant current drive part, realizes the constant of power.
To make the purpose of this utility model, technical scheme and effect clearer, clear and definite, develop simultaneously implementation referring to the drawings
The utility model is further described example.It should be appreciated that specific embodiment described herein is only to explain this practicality
It is new, it is not used to limit the utility model.
Referring to Fig. 4, the LED drive device that the utility model is provided includes LED string 11, for entering to input AC electricity
The rectification module 12 of row rectification, for keeping the constant constant-current driven module 13 of input current and for according to input voltage
Change output amendment voltage is to constant-current driven module 13, to keep the line voltage compensation circuit 14 of power invariability, the rectification mould
The input connection alternating current of block 12, the output end of the rectification module 12 connects line voltage compensation circuit by LED string 11
14；The line voltage compensation circuit 14 connects constant-current driven module 13.Realize that voltage is mended by setting up line voltage compensation circuit 14
Repay, when input line voltage is fluctuated, exportable amendment voltage to constant-current driven module 13 is driven, to realize work(
Rate it is constant, it is to avoid occur pressure dodge phenomenon.In the present embodiment, the rectification module 12 is rectifier bridge.
Specifically, the line voltage compensation circuit 14 of the LED drive device includes phase time switch module 10, time electricity
Press modular converter 20 and voltage operational module 30, the negative pole of the connection LED of phase time switch module 10 string 11, also successively
Connection Time voltage transformation module 20 and voltage operational module 30, by phase time switch module, 10 pairs are depressured through LED string 11
Input voltage afterwards is sampled, i.e., to carrying out voltage sample at DOUT in figure, and exports the corresponding time according to sampled voltage
Pulse signal, the time pulse signal is related to the line voltage VAC of line voltage output after rectified, and figure is specifically please combined in the lump
5, phase time switch module 10 is sampled at DOUT, i.e. voltage at DOUT is that line voltage VAC passes through certain amount LED
Voltage after the pressure drop of lamp string 11, so the characteristics of voltage has contained line voltage VAC at DOUT, different line voltage VAC with
Corresponding DOUT voltage relationships are as shown in figure 5, when line voltage changes, respective change, phase time also occur for DOUT
Modular converter 10 is by one time pulse signal related to line voltage VAC sizes of DOUT voltage outputs according to collection.
The time pulse signal that 20 receiving phase time of time voltage modular converter modular converter 10 is exported afterwards, will be described
Time pulse signal is converted to corresponding DC voltage to voltage operational module 30, the DC voltage equally with line voltage VAC
Correlation, is adjusted to reference voltage according to the DC voltage by voltage operational module 30 and exports amendment voltage to control afterwards
Constant current driving processed, according to the fluctuation of line voltage adjustment output in real time to the amendment voltage of constant-current drive circuit, realizes input work
Rate it is constant, it is to avoid LED is impaired because of power swing.
Further, also referring to Fig. 6, the phase time switch module 10 includes the first partial pressure unit 101, compared
Unit 102 and ALU 103, first partial pressure unit 101 connect the negative pole of LED string 11, are also sequentially connected institute
State comparing unit 102 and ALU 103, the output end Connection Time voltage conversion mould of the ALU 103
Block 20, by 101 pairs of the first partial pressure unit be depressured through LED string 11 after input voltage sample, comparing unit 102 is according to adopting
The corresponding level signal of sample voltage output to ALU 103, ALU 103 is exported according to the level signal
Very first time pulse signal and the second time pulse signal.Specifically, the utility model passes through 101 pairs of the first partial pressure unit
DOUT voltages are acquired, and comparing unit 102 generates the pulse voltage of different in width according to the DOUT voltages of collection afterwards, through patrolling
Collect 103 pairs of the arithmetic element pulse voltage to carry out after logical operation process, according to the different final outputs two of pulse width
The time pulse signal related to line voltage VAC sizes, i.e. very first time pulse signal and the second time pulse signal.
Preferably, first partial pressure unit 101 includes first resistor R1, second resistance R2,3rd resistor R3 and the 4th
Resistance R4；The comparing unit 102 includes first comparator A1, the second comparator A2 and the 3rd comparator A3；The logic fortune
Calculating unit 103 includes the first NOT gate NOT1, the second NOT gate NOT2, first and door AND1 and second and door AND2.
The first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 are sequentially connected in series in the and of LED string 11
Between ground, the midpoint connection first comparator A1 of the first resistor R1 and second resistance R2 in-phase input end, described second
Resistance R2 and 3rd resistor R3 midpoint connect the second comparator A2 in-phase input end, the 3rd resistor R3 and the 4th resistance
R4 midpoint connects the 3rd comparator A3 in-phase input end, and the first comparator A1, the second comparator A2 and the 3rd compare
Device A3 inverting input is all connected with reference voltage end；The output end connection first and the one of door AND1 of the first comparator A1
Individual input, the output end of the second comparator A2 connects a second and door AND2 input, also passes through the first NOT gate
NOT1 connections first and door AND1 another input, the output end of the 3rd comparator A3 is connected by the second NOT gate NOT2
Connect another input of second and door AND2；Described first is defeated with the first of door AND1 output end Connection Time modular converter
Enter end, the second input of described second and door AND2 output end Connection Time voltage transformation module 20.
Wherein, the first comparator A1, the second comparator A2 and the 3rd comparator A3 detection threshold value be respectively Vth1,
Vth2 and Vth3, when the lower section voltage DOUT of LED string 11 is more than Vth1, Vth2, Vth3（Wherein Vth1<Vth2<Vth3）When, the
One comparator A1, the second comparator A2 and the 3rd comparator A3 export high level respectively, specifically also referring to Fig. 7, i.e., and first
Comparator A1, the second comparator A2 and the 3rd comparator A3 output voltage AO, BO and CO are the pulse voltage of different in width, it
The output voltage of three comparators exports very first time pulse signal after two NOT gates and two logical operations with door afterwards
DISCHG and the second time pulse signal CHG to time voltage modular converter 20, the two time pulse signals be dutycycle with
Signal related line voltage VAC, reflects line voltage VAC change, specific when the lower section voltage DOUT of LED string 11 is arrived in Vth1
When between Vth2, effectively, when voltage DOUT is between Vth2 to Vth3 below lamp string, effectively, time voltage turns CHG DISCHG
Mold changing block 20 according to the very first time pulse signal DISCHG and the second time pulse signal CHG high level hold time by
It is converted to corresponding DC voltage.
Further, also referring to Fig. 8, the time voltage modular converter 20 includes current source 201I1, first switch
Unit 202, second switch unit 203 and charge/discharge unit 204, the first switch unit 202 and second switch unit 203 are equal
Connect the ALU 103, respectively receive ALU 103 export very first time pulse signal DISCHG and
Second time pulse signal CHG, the current source 201I1 connects first switch unit 202 and charge and discharge by second switch power supply
Electric unit 204, the charge/discharge unit 204 is also connected with voltage operational module 30.Wherein described first switch unit 202 is according to
One time pulse signal DISCHG is closed or disconnected, and the second switch unit 203 is closed according to the second time pulse signal CHG
Or disconnect；When first switch unit 202 disconnects and second switch unit 203 is closed, current source 201 exports the first electric current to filling
Discharge cell 204 charges；When first switch unit 202 is closed and second switch unit 203 disconnects, charge/discharge unit 204 enters
Row electric discharge, output DC voltage to voltage operational module 30.According to very first time pulse signal DISCHG and the second time pulse
Signal CHG controls the working condition of first switch unit 202 and second switch unit 203 respectively, and then controls charge/discharge unit
204 charge or discharge, one DC level of output realizes time pulse to the conversion of voltage to voltage operational module 30.
Specifically, the first switch unit 202 includes the first analog switch S1, and the second switch unit 203 includes
Second analog switch S2, the charge/discharge unit 204 includes the first electric capacity C1；The control end connection of the first analog switch S1
First output end of the ALU 103 a, connection end of the first analog switch S1 connects the first electric capacity C1
One end, a second analog switch S2 connection end and the input of voltage operational module 30, the first analog switch S1
Another connection end and the first electric capacity C1 other end be grounded；Another connection end of the second analog switch S2 passes through
Current source 201 connects VCC feeder ears, and the second of the control end connection ALU 103 of the second analog switch S2 is defeated
Go out end.
When the very first time, pulse signal CHG was effective, as high level when, now the second time pulse signal DISCHG is
Low level, then the second analog switch S2 is closed and the first analog switch S1 disconnects, and current source 201I1 passes through the second analog switch S2
First electric capacity C1 is charged；When the second time pulse signal DISCHG is effective, as high level when, now very first time
Pulse signal CHG is low level, then the first analog switch S1 closures and the second analog switch S2 disconnects, the first electric capacity C1 passes through the
One analog switch S1 discharges, so as to export DC level Vadj to voltage operational module 30, is provided for the follow-up amendment voltage that calculates
Basis.
Further, also referring to Fig. 9, the voltage operational module 30 includes constant current source unit 301, current subtraction
The partial pressure unit 303 of device 302 and second, the constant current source unit 301 connects the charge/discharge unit 204, the constant current source unit
301 also connect the second partial pressure unit 303, the connection of the second partial pressure unit 303 constant current driving by the current subtractor 302
Module 13, the constant current source unit 301 is according to corresponding second electric current of the direct voltage output, and second electric current is by electricity
Flow and the 3rd electric current is exported after subtracter 302, the second partial pressure unit 303 is adjusted simultaneously according to the 3rd electric current to reference voltage
Output amendment voltage.
Specifically, in the line voltage compensation circuit 14 that the utility model is provided, the voltage operational module 30 provides three kinds
Embodiment, as shown in figure 9, in the first embodiment, the constant current source unit 301 includes operational amplifier OP1, the first metal-oxide-semiconductor
M1 and the 5th resistance R5；The current subtractor 302 includes the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4 and the 5th
Metal-oxide-semiconductor M5；Second partial pressure unit 303 includes the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8；The operation amplifier
The output end of device OP1 in-phase input end Connection Time voltage transformation module 20, the inverting input of the operational amplifier OP1
Connect the first metal-oxide-semiconductor M1 source electrode and the 5th resistance R5 one end, the other end ground connection of the 5th resistance R5；The computing is put
Big device OP1 output end connects the first metal-oxide-semiconductor M1 grid；The second metal-oxide-semiconductor M2 of drain electrode connection of first metal-oxide-semiconductor M1 leakage
The grid of pole, the second metal-oxide-semiconductor M2 grid and the 3rd metal-oxide-semiconductor M3；The source electrode and the 3rd metal-oxide-semiconductor of the second metal-oxide-semiconductor M2
M3 source electrode is all connected with VCC feeder ears；Drain electrode that the 4th MOS of drain electrode connection of the 3rd metal-oxide-semiconductor M3 is closed, the 6th resistance R6
One end and the 7th resistance R7 one end；The grid of the 4th metal-oxide-semiconductor M4 connects the 5th metal-oxide-semiconductor M5 grid, the 5th metal-oxide-semiconductor M5
Drain electrode and external current source 201, the source electrode of the 4th metal-oxide-semiconductor M4 and the 5th metal-oxide-semiconductor M5 source ground；6th electricity
Hinder R6 other end connection reference voltage end；The other end of the 7th resistance R7 is grounded by the 8th resistance R8, and the described 7th
Resistance R7 and the 8th resistance R8 midpoint export the amendment voltage.In the present embodiment, the first metal-oxide-semiconductor M1, the 4th metal-oxide-semiconductor
M4 and the 5th metal-oxide-semiconductor M5 is N-channel MOS pipe；The second metal-oxide-semiconductor M2 and the 3rd metal-oxide-semiconductor M3 are P-channel metal-oxide-semiconductor.
Wherein, the DC voltage Vadj that the constant current source unit 301 is exported according to charge/discharge unit 204, generation is corresponding
Second electric current Iadj, Iadj=Vadj/R5, the second electric current Iadj export the 3rd electric current after current subtractor 302
Icomp, Icomp=Idc-Iadj=Idc-Vadj/R5, sixth resistance R6R6 of the current subtractor 302 from the second partial pressure unit 303
Middle to extract certain electric current, final amendment voltage output is：
After the line voltage compensation circuit 14 provided through the utility model carries out voltage amendment, the amendment voltage Vrefx of generation
Waveform as shown in Figure 10, when input voltage is raised, corresponding Vref can accordingly reduce, change such as Figure 11 of power vs. voltage
Shown, it can be found that power does not change with the change of line voltage substantially, when input voltage produces fluctuation, system power also can
Remain constant, substantially increase the stability of input power, improve the reliability of LED product.
As shown in figure 12, its second of embodiment of voltage operational module 30 provided for the utility model, it is with above-mentioned
A kind of difference of embodiment is using a constant-current source Iref that instead of voltage source Vref as shown in figure 13, it is this practicality
The third embodiment of the voltage operational module 30 of new offer, the difference of itself and the first above-mentioned embodiment is voltage
Source Vref is got rid of, and directly drives resistance string to provide amendment voltage Vrefx with the electric current of sample conversion.
Further, the line voltage compensation circuit 14 that the utility model is provided can also realize Fill valley application, during by phase
Between modular converter 10 sampled voltage at the positive output end of rectifier bridge is moved to from the lower section of LED string 11, due in Fill valley application
The correlation of DOUT voltages and line voltage is no longer so strong, therefore detects that line voltage is compensated at VAC.
Correspondingly, the utility model correspondingly provides a kind of line voltage compensation method of LED drive device, such as Figure 14 institutes
Show, the line voltage compensation method of the LED drive device comprises the following steps：
S100, by phase time switch module the input voltage after being depressured through LED string is sampled, and according to sampling
The corresponding time pulse signal of voltage output；
S200, by time voltage modular converter the time pulse signal is converted into corresponding DC voltage；
S300, reference voltage is adjusted according to the DC voltage by voltage operational module and export amendment voltage with
Control constant current driving.
The utility model correspondingly provides a kind of line voltage compensation circuit of LED drive device, due to above to described
Line voltage compensation circuit is described in detail, and is no longer described in detail herein.
In summary, in the utility model is provided LED drive device and its line voltage compensation circuit, the LED drivings
The line voltage compensation circuit of device includes phase time switch module, time voltage modular converter and voltage operational module；By phase
Position time modular converter is sampled to the input voltage after being depressured through LED string, and when exporting corresponding according to sampled voltage
Between pulse signal；The time pulse signal is converted to corresponding DC voltage to voltage operational mould by time voltage modular converter
Block, is adjusted to reference voltage according to the DC voltage by voltage operational module and exports amendment voltage to control constant current to drive
It is dynamic, constant current drive part is controlled by using the input voltage with amendment, the constant of power is realized.
It is understood that for those of ordinary skills, can according to the technical solution of the utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model
Scope of the claims.
Claims (9)
1. a kind of line voltage compensation circuit of LED drive device, it is characterised in that including phase time switch module, time electricity
Press modular converter and voltage operational module；The input voltage after being depressured through LED string is adopted by phase time switch module
Sample, and corresponding time pulse signal is exported according to sampled voltage；Time voltage modular converter turns the time pulse signal
Corresponding DC voltage is changed to voltage operational module, reference voltage is carried out according to the DC voltage by voltage operational module
Adjust and export amendment voltage to control constant current to drive.
2. the line voltage compensation circuit of LED drive device according to claim 1, it is characterised in that the phase time
Modular converter includes the first partial pressure unit, comparing unit and ALU；By the first partial pressure unit to being depressured through LED string
Input voltage afterwards is sampled, and comparing unit exports corresponding level signal to ALU according to sampled voltage, patrols
Collect arithmetic element and very first time pulse signal and the second time pulse signal are exported according to the level signal.
3. the line voltage compensation circuit of LED drive device according to claim 2, it is characterised in that the time voltage
Modular converter includes current source, first switch unit, second switch unit and charge/discharge unit；The first switch unit according to
Very first time pulse signal is closed or disconnected, and the second switch unit is closed or disconnected according to the second time pulse signal；
When first switch unit disconnects and second switch unit is closed, current source exports the first electric current and charge/discharge unit is filled
Electricity；When first switch unit closure and the disconnection of second switch unit, charge/discharge unit is discharged, output DC voltage to electricity
Press computing module.
4. the line voltage compensation circuit of LED drive device according to claim 1, it is characterised in that the voltage operational
Module includes constant current source unit, current subtractor and the second partial pressure unit；The constant current source unit is defeated according to the DC voltage
Go out corresponding second electric current, second electric current exports the 3rd electric current after current subtractor, and the second partial pressure unit is according to institute
The 3rd electric current is stated to be adjusted reference voltage and export amendment voltage.
5. the line voltage compensation circuit of LED drive device according to claim 2, it is characterised in that first partial pressure
Unit includes first resistor, second resistance, 3rd resistor and the 4th resistance；The comparing unit includes first comparator, second
Comparator and the 3rd comparator；The ALU includes the first NOT gate, the second NOT gate, first and door and second and door；
The first resistor, second resistance, 3rd resistor and the 4th resistance are sequentially connected in series between LED string and ground, and described
The midpoint of one resistance and second resistance connects the in-phase input end of first comparator, the midpoint of the second resistance and 3rd resistor
The in-phase input end of the second comparator is connected, the 3rd resistor connects the same mutually defeated of the 3rd comparator with the midpoint of the 4th resistance
Enter end, the inverting input of the first comparator, the second comparator and the 3rd comparator is all connected with reference voltage end；Described
The output end connection first of one comparator and an input of door, output end connection second and the door of second comparator
One input, another input that first and door are also connected by the first NOT gate, the output end of the 3rd comparator are led to
Cross the second NOT gate connection second and another input of door；Described first and the of the output end Connection Time modular converter of door
One input, described second with the second input of the output end Connection Time voltage transformation module of door.
6. the line voltage compensation circuit of LED drive device according to claim 3, it is characterised in that the first switch
Unit includes the first analog switch, and the second switch unit includes the second analog switch, and the charge/discharge unit includes first
Electric capacity；The control end of first analog switch connects the first output end of the ALU, and first simulation is opened
The connection end closed connects one end, a connection end of the second analog switch and the input of voltage operational module of the first electric capacity
End, another connection end of first analog switch and the other end of the first electric capacity are grounded；Second analog switch
Another connection end connects VCC feeder ears, the control end connection ALU of second analog switch by current source
The second output end.
7. the line voltage compensation circuit of LED drive device according to claim 4, it is characterised in that the constant-current source list
Member includes operational amplifier, the first metal-oxide-semiconductor and the 5th resistance；The current subtractor includes the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor, the
Four metal-oxide-semiconductors and the 5th metal-oxide-semiconductor；Second partial pressure unit includes the 6th resistance, the 7th resistance and the 8th resistance；The computing is put
The output end of the in-phase input end Connection Time voltage transformation module of big device, the inverting input connection of the operational amplifier the
One end of the source electrode of one metal-oxide-semiconductor and the 5th resistance, the other end ground connection of the 5th resistance；The output end of the operational amplifier
Connect the grid of the first metal-oxide-semiconductor；The drain electrode connection drain electrode of the second metal-oxide-semiconductor of first metal-oxide-semiconductor, the grid of the second metal-oxide-semiconductor and
The grid of 3rd metal-oxide-semiconductor；The source electrode of the source electrode of second metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor is all connected with VCC feeder ears；It is described
One end of drain electrode, one end of the 6th resistance and the 7th resistance that the 4th MOS of drain electrode connection of 3rd metal-oxide-semiconductor is closed；4th MOS
The grid of pipe connects grid, the drain electrode of the 5th metal-oxide-semiconductor and the external current source of the 5th metal-oxide-semiconductor, the source electrode of the 4th metal-oxide-semiconductor and
The source ground of 5th metal-oxide-semiconductor；The other end connection reference voltage end of 6th resistance；The other end of 7th resistance leads to
The 8th resistance eutral grounding is crossed, the midpoint of the 7th resistance and the 8th resistance exports the amendment voltage.
8. the line voltage compensation circuit of LED drive device according to claim 7, it is characterised in that the first MOS
Pipe, the 4th metal-oxide-semiconductor and the 5th metal-oxide-semiconductor are N-channel MOS pipe；Second metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor are P-channel metal-oxide-semiconductor.
9. a kind of LED drive device, including LED string, for carrying out the rectification module of rectification to input AC electricity and being used for
The constant-current driven module for keeping input current constant, it is characterised in that also including the line as described in claim 1-8 any one
Voltage compensating circuit, for correcting voltage to constant-current driven module according to the change of input voltage output, to keep the perseverance of power
It is fixed；The input connection alternating current of the rectification module, the output end of the rectification module is mended by LED series winding wiring voltage
Repay circuit；The line voltage compensation circuit connects constant-current driven module.
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| CN201720140822.9U CN206452581U (en) | 2017-02-16 | 2017-02-16 | A kind of LED drive device and its line voltage compensation circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658868A (en) * | 2017-02-16 | 2017-05-10 | 深圳市晟碟半导体有限公司 | LED driving apparatus, and line voltage compensation circuit and compensation method thereof |
| CN108399905A (en) * | 2018-05-03 | 2018-08-14 | 深圳市华星光电技术有限公司 | Display driver circuit and display drive method |
-
2017
- 2017-02-16 CN CN201720140822.9U patent/CN206452581U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658868A (en) * | 2017-02-16 | 2017-05-10 | 深圳市晟碟半导体有限公司 | LED driving apparatus, and line voltage compensation circuit and compensation method thereof |
| CN106658868B (en) * | 2017-02-16 | 2018-06-26 | 深圳市晟碟半导体有限公司 | A kind of LED drive device and its line voltage compensation circuit and compensation method |
| CN108399905A (en) * | 2018-05-03 | 2018-08-14 | 深圳市华星光电技术有限公司 | Display driver circuit and display drive method |
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