CN108282934A - LED drive device and compensation of delay driving circuit, driving method - Google Patents
LED drive device and compensation of delay driving circuit, driving method Download PDFInfo
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- CN108282934A CN108282934A CN201810257690.7A CN201810257690A CN108282934A CN 108282934 A CN108282934 A CN 108282934A CN 201810257690 A CN201810257690 A CN 201810257690A CN 108282934 A CN108282934 A CN 108282934A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention discloses LED drive device and compensation of delay driving circuit, driving methods, wherein the compensation of delay driving circuit includes rectification module, sampling module, reference voltage module, delay compensation module and constant current source module；Line voltage is sampled by sampling module, and sample rate current is exported according to sampled voltage, delay compensation module exports the compensation electric current of consecutive variations according to the sample rate current after the preset time that is delayed, and rear output reference voltage is modulated to constant current source module according to the reference voltage that the compensation electric current exports reference voltage module, it controls the constant current source module and constant current driving is carried out to the LED light string.The compensation electric currents of consecutive variations is exported again by the compensation of delay mode preset time that be delayed after exporting sample rate current, and it is not in current break that time-lag action, which makes curent change slowly, effectively inhibits power supply self-excitation phenomena, improves the stability of driving power.
Description
Technical field
The present invention relates to LED technology fields, more particularly to LED drive device and compensation of delay driving circuit, driving method.
Background technology
As shown in Figure 1, it is common line voltage compensation driving circuit frame diagram, by the way that compensation circuit is added to prevent line
Voltage VAC is excessively high to cause input power excessively high, and mainly by sampling circuit samples power supply VAC voltages, output is led to compensation circuit
Overcompensation circuit changes output to the reference voltage of constant-current source, and then changes the source voltage VCS of constant-current source power tube.Fig. 2 is
The simulation waveform of common line voltage compensation driving circuit in Fig. 1, wherein VAC are rectifier bridge output voltage, and VD is under LED light string
Square voltage, IS are the electric current that flows through of sample circuit, and IC be the electric current for compensating branch and flowing through, the reference of circuit generation on the basis of VIP
Voltage, VCS are the voltage on sampling resistor RCS, both the source voltage of constant-current source power tube.
As shown in Fig. 2, due in common line voltage compensation circuit, the pass that circuit and sample circuit are synchronous is generally compensated for
System, when VAC rises (before A points), the upper voltages of VD are smaller, and sample circuit electric current IS is zero, and compensation circuit electric current IC is also zero,
VCS is gradually increasing, when the voltage of VD is sufficiently high（At A）, sample circuit electric current IS can not ignore, and compensation circuit reflects sampling in real time
Circuital current, this electric current also be can not ignore, therefore at A, and due to compensating the appearance of electric current IC, VCS mutates, draws at the moment
Rise power supply VAC electric current be mutated, due in circuit parasitic inductance effect (), VAC will appear electricity at A
It from swashing, causes LED drive power unstable, influences LED load normal work.
Thus the prior art could be improved and improve.
Invention content
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of LED drive device and delays
Compensation drive circuit, driving method so that delay preset time exports again after exporting sample rate current by compensation of delay mode
The compensation electric current of consecutive variations, it is not in current break that time-lag action, which makes curent change slowly, effectively inhibits power supply certainly
Swash phenomenon, improves stability and the safety of LED drivings.
In order to achieve the above object, this invention takes following technical schemes：
A kind of compensation of delay driving circuit includes for output line voltage after the progress rectification of input AC electricity to LED light string
Rectification module further includes sampling module, reference voltage module, delay compensation module and constant current source module；By sampling module to line
Voltage is sampled, and exports sample rate current according to sampled voltage, and delay compensation module is pre- in delay according to the sample rate current
If the reference voltage for exporting the compensation electric current of consecutive variations after the time, and being exported to reference voltage module according to the compensation electric current
Rear output reference voltage is modulated to constant current source module, the constant current source module is controlled and constant current drive is carried out to the LED light string
It is dynamic.
In the compensation of delay driving circuit, the delay compensation module is specifically used for being prolonged according to the sample rate current
When preset time after output consecutive variations and slope absolute value be less than predetermined threshold value compensation electric current.
In the compensation of delay driving circuit, the input terminal input AC electricity of the rectification module, the rectification module
Output end connection LED light string anode, the input terminal of the sampling module connects output end or the company of the rectification module
The cathode of LED light string is connect, the cathode of the LED light string is also connected with the constant current source module, and the output end of the sampling module connects
The 1st end of the delay compensation module is connect, the 2nd end of the delay compensation module connects the reference voltage module, described to prolong
When module the 3rd end connect the control terminal of the constant current source module.
In the compensation of delay driving circuit, the sampling module includes first resistor and the first metal-oxide-semiconductor；Described first
One end of resistance is the input terminal of the sampling module, connects the output end of the rectification module or bearing for connection LED light string
Pole, the other end of the first resistor connect the drain electrode of the first metal-oxide-semiconductor；The grid of first metal-oxide-semiconductor is the sampling module
Output end, the 1st end of the drain electrode and the delay compensation module of the first metal-oxide-semiconductor of connection, the source electrode of first metal-oxide-semiconductor connects
Ground.
In the compensation of delay driving circuit, the delay compensation module includes second resistance, 3rd resistor, the 4th electricity
Resistance, capacitance and the second metal-oxide-semiconductor；One end of the second resistance is the 1st end of the delay compensation module, connects the sampling mould
The output end of block, the grid of one end and the second metal-oxide-semiconductor of the other end connection capacitance of the second resistance；Second metal-oxide-semiconductor
Drain electrode be the delay compensation module the 3rd end, connect the control terminal of the constant current source module, one end of 3rd resistor and the
One end of four resistance；The other end of the 3rd resistor is the 2nd end of the delay compensation module, connects the reference voltage mould
Block；The other end of the other end of the capacitance, the source electrode of the second metal-oxide-semiconductor and the 4th resistance is grounded.
In the compensation of delay driving circuit, the delay compensation module include 3rd resistor, the 4th resistance, capacitance and
Second metal-oxide-semiconductor；The source electrode of second metal-oxide-semiconductor is the 1st end of the delay compensation module, connects the output of the sampling module
End, the drain electrode of second metal-oxide-semiconductor are the 3rd end of the delay compensation module, connect one end of the capacitance, 3rd resistor
One end, the 4th resistance one end and the constant current source module control terminal；The other end of the 3rd resistor is mended for the delay
The 2nd end for repaying module connects the reference voltage module；The other end of the capacitance, the source electrode of the second metal-oxide-semiconductor and the 4th resistance
The other end be grounded.
In the compensation of delay driving circuit, the constant current source module includes operational amplifier, third metal-oxide-semiconductor and the 5th
Resistance；The in-phase input end of the operational amplifier is the control terminal of the constant current source module, connects the 3rd of the compensating module
End, one end of the source electrode and four or five resistance of the inverting input connection third metal-oxide-semiconductor of the operational amplifier, the operation amplifier
The grid of the output end connection third metal-oxide-semiconductor of device；The cathode of the drain electrode connection LED light string of the third metal-oxide-semiconductor；5th electricity
The other end of resistance is grounded.
A kind of compensation of delay driving method comprising following steps：
Line voltage is sampled by sampling module, and sample rate current is exported according to sampled voltage；
Delay compensation module exports the compensation electric current of consecutive variations according to the sample rate current after the preset time that is delayed, and according to
The reference voltage that the compensation electric current exports reference voltage module is modulated rear output reference voltage to constant current source module；
The constant current source module carries out constant current driving to the LED light string.
In the compensation of delay driving method, the delay compensation module is according to the sample rate current when delay is default
Between after output consecutive variations compensation electric current the step of specifically include：
The absolute value that delay compensation module exports consecutive variations and slope according to the sample rate current after the preset time that is delayed is small
In the compensation electric current of predetermined threshold value.
A kind of LED drive device, including shell are provided with pcb board in the shell, are provided on the pcb board as above
The compensation of delay driving circuit.
Compared to the prior art, in LED drive device provided by the invention and compensation of delay driving circuit, driving method,
The compensation of delay driving circuit includes for the rectification mould to output line voltage after the progress rectification of input AC electricity to LED light string
Block further includes sampling module, reference voltage module, delay compensation module and constant current source module；By sampling module to line voltage into
Row sampling, and sample rate current is exported according to sampled voltage, delay compensation module is according to the sample rate current in delay preset time
The compensation electric current of consecutive variations is exported afterwards, and is adjusted according to the reference voltage that the compensation electric current exports reference voltage module
Output reference voltage controls the constant current source module and carries out constant current driving to the LED light string to constant current source module after system.Pass through
The compensation of delay mode preset time that be delayed after exporting sample rate current exports the compensation electric currents of consecutive variations, time-lag action again
So that curent change is not in slowly current break, effectively inhibit power supply self-excitation phenomena, improve LED drivings stability and
Safety.
Description of the drawings
Fig. 1 is the structure diagram of line voltage compensation driving circuit in the prior art.
Fig. 2 is simulation waveform of the existing line voltage compensation driving circuit with each circuit node of VAC voltage changes.
Fig. 3 is the structure diagram of the first preferred embodiment of compensation of delay driving circuit provided by the invention.
Fig. 4 is the structure diagram of the second preferred embodiment of compensation of delay driving circuit provided by the invention.
Fig. 5 is the circuit diagram of compensation of delay driving circuit first embodiment provided by the invention.
Fig. 6 is the circuit diagram of compensation of delay driving circuit second embodiment provided by the invention.
Fig. 7 is the simulation waveform with each circuit node of VAC voltage changes in compensation of delay driving circuit provided by the invention
Figure.
Fig. 8 is the flow chart of compensation of delay driving method provided by the invention.
Specific implementation mode
The shortcomings of causing power supply self-excitation in view of line voltage compensation circuit in the prior art, the purpose of the present invention is to provide
A kind of LED drive device and compensation of delay driving circuit, driving method are made by compensation of delay mode in output sample rate current
Delay preset time exports the compensation electric current of consecutive variations again afterwards, and it is not in that electric current is prominent that time-lag action, which makes curent change slowly,
Become, effectively inhibit power supply self-excitation phenomena, improves stability and the safety of LED drivings.
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to
Limit the present invention.
Fig. 3 and Fig. 4 are please referred to, is two kinds of preferred embodiments provided by the invention, compensation of delay provided by the invention drives
Dynamic circuit is connect with LED light string 10, including rectification module 11, sampling module 12, reference voltage module 13, delay compensation module 14
With constant current source module 15, wherein the input terminal input AC of the rectification module 11 is electric, the output end of the rectification module 11 connects
The anode of LED light string 10 is connect, wherein in the first preferred embodiment, the input terminal of the sampling module 12 connects the rectification module
11 output end, in the second preferred embodiment, the cathode of the input terminal connection LED light string 10 of the sampling module 12 samples
Module 12 can be sampled from the front end of LED light string 10 or rear end into row line voltage, can achieve the purpose that sampling output, two kinds preferably
In embodiment, the cathode of the LED light string 10 is also connected with the constant current source module 15, the output end connection of the sampling module 12
2nd end at the 1st end of the delay compensation module 14, the delay compensation module 14 connects the reference voltage module 13, institute
The 3rd end for stating time delay module connects the control terminal of the constant current source module 15, and the rectification module 11 is rectifier bridge.
In first preferred embodiment, by rectification module 11 to output line voltage after the progress rectification of input AC electricity to LED light
String 10, and directly samples line voltage by sampling module 12, and sample rate current is exported according to sampled voltage, and second compared with
In good embodiment, output line voltage is to LED light string 10 after carrying out rectification to input AC electricity by rectification module 11, by sampling mould
Block 12 samples the line voltage after the decompression of LED light string 10, and exports sample rate current according to sampled voltage, i.e., second preferably
The voltage sampled in embodiment is voltage of the line voltage after certain amount LED pressure drops, the characteristics of equally containing line voltage,
Therefore two kinds of preferred embodiments can realize the sampling to line voltage, in two kinds of preferred embodiments after obtaining sample rate current,
Export the compensation electric current of consecutive variations after the preset time that is delayed according to the sample rate current by delay compensation module 14, and according to
The reference voltage that the compensation electric current exports reference voltage module 13 is modulated rear output reference voltage to constant current source module
15, it controls the constant current source module 15 and constant current driving is carried out to the LED light string 10, due to delay compensation module 14 and sampling mould
The not synchronism output electric current of block 12 compensates and is spaced preset time between electric current and sample rate current, and the two is in delay relationship, therefore
It is under time-lag action so that slow in compensation starting point curent change, it not will produce current break phenomenon, and then effectively inhibit
Power supply self-excitation.
The present invention by 11 rectification output line voltage VAC of rectification module to LED light string 10, it is straight by sampling module 12 later
It connects and line voltage VAC is sampled, or the line voltage VAC after the decompression of LED light string 10 is sampled, i.e., to LED light string
10 lower sections carry out voltage samples and obtain sampled voltage VD, and sample rate current is exported to delay compensation module 14 according to sampled voltage VD,
Compensation of delay template does not export corresponding compensation electric current in real time at this time, but is exported again after the preset time that is delayed, due to delay
Effect, compensate electric current at this time continuously will slowly be increased by zero, since curent change is slowly therefore according to compensation electric current to benchmark
The reference voltage that voltage exports after being modulated equally variation is slow so that under the voltage in constant current source module 15 on sampling resistor
Reduction of speed degree equally slows down, and not will produce the power supply self-excitation phenomena caused by the voltage jump on sampling resistor, effectively increases
The stability and reliability of LED drive power.
Preferably, the delay compensation module 14 is used to be exported after the preset time that is delayed according to the sample rate current continuous
The absolute value of variation and slope is less than the compensation electric current of predetermined threshold value, causes with synchronous generation compensation electric current in the prior art
Unlike each node current voltage mutates in compensation starting dot circuit, delay compensation module 14 will adopt in the present embodiment
Consecutive variations are exported after the preset time of sample electric current output again, and the absolute value of slope is less than the compensation electric current of predetermined threshold value,
When it is implemented, the delay compensation module 14 includes RC delay circuits, under the action of RC delay circuits, output one is continuously slow
Slowly the compensation electric current changed, compensate electric current rise or fall speed be compensate current curve slope, the slope it is absolute
Value is less than predetermined threshold value, i.e., the maximum speed that rises or falls will be less than the corresponding speed of predetermined threshold value, and the predetermined threshold value is
The corresponding greatest gradient of sample rate current curve, it is ensured that the reference voltage that output is controlled to constant current source module 15 not will produce mutation,
And then ensure that the voltage in constant current source module 15 on sampling resistor not will produce mutation, achieve the effect that self-excitation inhibits.
Further, in following specific examples with the second preferred embodiment to the specific of the compensation of delay driving circuit
Circuit and its course of work are described in detail, and please refer to Fig. 5 and Fig. 6, two provided for the second preferred embodiment of the invention
Kind concrete application embodiment, the sampling module 12 include first resistor R1 and the first metal-oxide-semiconductor M1；The one of the first resistor R1
End is the input terminal of the sampling module 12, connects the cathode of LED light string 10, the other end connection first of the first resistor R1
The drain electrode of metal-oxide-semiconductor M1；The grid of the first metal-oxide-semiconductor M1 is the output end of the sampling module 12, the first metal-oxide-semiconductor M1's of connection
1st end of drain electrode and the delay compensation module 14, the source electrode ground connection of the first metal-oxide-semiconductor M1.By by first resistor R1 and
The VD voltages for 10 cathode of sampling circuit samples LED light string that first metal-oxide-semiconductor M1 is constituted simultaneously export sample rate current IS, for follow-up
The supplemental current of delay compensating chain exports.
Specifically, in first embodiment provided by the invention, as shown in figure 5, the delay compensation module 14 includes second
Resistance R2,3rd resistor R3, the 4th resistance R4, capacitance C1 and the second metal-oxide-semiconductor M2；One end of the second resistance R2 is described prolongs
When compensating module 14 the 1st end, connect the output end of the sampling module 12, the other end of the second resistance R2 connects capacitance
The grid of one end of C1 and the second metal-oxide-semiconductor M2；The drain electrode of the second metal-oxide-semiconductor M2 is the 3rd end of the delay compensation module 14,
Connect the control terminal of the constant current source module 15, one end and the 4th resistance R4 of 3rd resistor R3 one end；The 3rd resistor
The other end of R3 is the 2nd end of the delay compensation module 14, connects the reference voltage module 13；The capacitance C1's is another
The other end at end, the source electrode of the second metal-oxide-semiconductor M2 and the 4th resistance R4 is grounded.
In the present embodiment, second resistance R2 and capacitance C1 in the complementary module that is delayed constitute RC delay circuits, compensate electric current
IC is the electric current for flowing through the second metal-oxide-semiconductor M2 drain electrodes, since there are RC to prolong between the second metal-oxide-semiconductor M2 and the grid of the first metal-oxide-semiconductor M1
When, therefore the grid voltage of the second metal-oxide-semiconductor M2 can be later than the grid voltage of the first metal-oxide-semiconductor M1, so that the second metal-oxide-semiconductor M2 productions
Raw compensation electric current IC is later than the sample rate current IS of the first metal-oxide-semiconductor M1, and then achievees the effect that delay output, prolongs in the present embodiment
When preset time range can pass through adjust second resistance R2 and capacitance C1 resistance value and capacitance setting, the range of the preset time
For preferred 100us-500us, can be specifically adjusted according to actual demand.
In second embodiment provided by the invention, as shown in fig. 6, the delay compensation module 14 include 3rd resistor R3,
4th resistance R4, capacitance C1 and the second metal-oxide-semiconductor M2；The source electrode of the second metal-oxide-semiconductor M2 is the 1 of the delay compensation module 14
End, connects the output end of the sampling module 12, and the drain electrode of the second metal-oxide-semiconductor M2 is the 3rd of the delay compensation module 14 the
End, connects one end of the capacitance C1, one end of 3rd resistor R3, one end of the 4th resistance R4 and the constant current source module 15
Control terminal；The other end of the 3rd resistor R3 is the 2nd end of the delay compensation module 14, connects the reference voltage module
13；The other end of the other end of the capacitance C1, the source electrode of the second metal-oxide-semiconductor M2 and the 4th resistance R4 is grounded.
In the present embodiment, the 4th resistance R4 and capacitance C1 in the complementary module that is delayed constitute RC delay circuits, compensate electric current
IC is the electric current for flowing through the second metal-oxide-semiconductor M2 drain electrode and capacitance C1, the complete mirror image of the electric current due to flowing through the second metal-oxide-semiconductor M2 first
The sample rate current IS of metal-oxide-semiconductor M1, and the electric current that electric current IC further comprises capacitance C1 is compensated, in prolonging for capacitance C1 and the 4th resistance R4
Under Shi Zuoyong, again such that compensation electric current IC can be later than the sample rate current IS of the first metal-oxide-semiconductor M1, and then reach the effect of delay output
Fruit, the range of delay preset time can be arranged by adjusting the resistance value and capacitance of the 4th resistance R4 and capacitance C1 in the present embodiment,
The ranging from preferred 100us-500us of the preset time, can specifically be adjusted according to actual demand.
Further, in two kinds of embodiments provided by the invention, after obtaining sample rate current, then by 3rd resistor R3 and
The reference voltage that 4th resistance R4 exports reference voltage module 13 is modulated rear output reference voltage VIP to constant current source module
15 control terminal carries out constant current driving to control the constant current source module 15 to the LED light string 10, realizes delay and continuous change
The line voltage compensation of change drives, and the specific reference voltage directly can provide or divide offer by constant pressure source.
Further, the constant current source module 15 includes operational amplifier A 1, third metal-oxide-semiconductor M3 and the 5th resistance R5；Institute
The in-phase input end for stating operational amplifier A 1 is the control terminal of the constant current source module 15, connects the 3rd end of the compensating module,
One end of the source electrode and four or five resistance of the inverting input connection third metal-oxide-semiconductor M3 of the operational amplifier A 1, the operation are put
The grid of the output end connection third metal-oxide-semiconductor M3 of big device A1；The cathode of the drain electrode connection LED light string 10 of the third metal-oxide-semiconductor M3；
The other end of the 5th resistance R5 is grounded.Wherein the 5th resistance R5 is the sampling resistor in constant pressure source module, and the operation is put
Big device A1 amplifies the pressure difference of offset voltage VIP and the voltage VCS by sampling resistor acquisition to drive third metal-oxide-semiconductor M3, realizes
Constant current drives.
The first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2 and third metal-oxide-semiconductor M3 are NMOS tube.
To more fully understand the driving process and effect of compensation of delay driving circuit provided by the invention, below in conjunction with Fig. 5
And Fig. 7, the operation principle of compensation of delay driving circuit provided by the invention is explained with first embodiment：
Output line voltage VAC is to LED light string 10 after rectifier bridge carries out rectification to input AC electricity, and line voltage VAC is by LED light string
10 decompressions, simultaneously by the VD voltages of 10 cathode of sampling circuit samples LED light string being made of first resistor R1 and the first metal-oxide-semiconductor M1
Sample rate current IS is exported, since there are RC delays, the second metal-oxide-semiconductors between the second metal-oxide-semiconductor M2 and the grid of the first metal-oxide-semiconductor M1
The grid voltage of M2 can be later than the grid voltage of the first metal-oxide-semiconductor M1, so that the compensation electric current IC evenings that the second metal-oxide-semiconductor M2 is generated
In the sample rate current IS of the first metal-oxide-semiconductor M1, modulated reference voltage VIP is exported to fortune according to the sample rate current IS of delay output
Calculate the in-phase input end of amplifier A1, operational amplifier A 1 is by the pressure of offset voltage VIP and the voltage VCS by sampling resistor acquisition
Difference amplification realizes compensation of delay constant current driving to drive third metal-oxide-semiconductor M3.
During being somebody's turn to do, the voltage and current simulation waveform of Fig. 7 offers is please referred to., when VAC voltages rise to predeterminated voltage
（That is the A points in Fig. 7）When before, voltage, that is, VD voltages at 10 cathode of LED light string are smaller, and sample rate current IS can be ignored not at this time
Meter, then the compensation electric current IC obtained after being delayed is also zero, and VCS voltage is gradually increasing；
When VAC voltages rise to predeterminated voltage, sample rate current IS can not ignore, but due to the time-lag action of RC delay circuits,
Compensation electric current IC at this time remains as zero；
When VAC voltages continue to rise, sample rate current IS is equally gradually increased, and due to time-lag action, compensation electric current IC will be pre-
If being slowly increased by zero after the time（As shown in IC electric currents dotted line in Fig. 7）, the starting point of electric current is specifically compensated, that is, is delayed
Time can be by adjusting RC delay circuit parameter changes, while, the at this time lower reduction of speed of reference voltage VIP slow better than curent change
Degree slows down（As shown in VIP voltages dotted line in Fig. 7）, the decrease speed of VCS voltage equally slows down（Such as VCS voltage dotted line institute in Fig. 7
Show）, will not there is a phenomenon where voltage and currents to be mutated, therefore inductance parasitic in circuit can't make power supply be produced from A
Swash, effectively realizes that power supply self-excitation inhibits, improve the stability of LED drive power.
Correspondingly, the present invention also provides a kind of compensation of delay driving methods, as shown in figure 8, the compensation of delay driving side
Method includes the following steps：
S100, the line voltage after LED light string is depressured is sampled by sampling module, and sampling electricity is exported according to sampled voltage
Stream；
S200, delay compensation module export the compensation electric current of consecutive variations according to the sample rate current after the preset time that is delayed,
And rear output reference voltage is modulated to constant-current source according to the reference voltage that the compensation electric current exports reference voltage module
Module；
S300, the constant current source module carry out constant current driving to the LED light string.
It is specifically included in the step S200：Delay compensation module is defeated after the preset time that is delayed according to the sample rate current
The absolute value for going out consecutive variations and slope is less than the compensation electric current of predetermined threshold value.Referring specifically to the corresponding implementation of the said goods
Example.
The present invention correspondingly provides a kind of LED drive device, including shell, and pcb board is provided in the shell, described
Compensation of delay driving circuit as described above is provided on pcb board, due to being carried out to the compensation of delay driving circuit above
It is discussed in detail, and will not be described here in detail.
In conclusion in LED drive device provided by the invention and compensation of delay driving circuit, driving method, it is described to prolong
When compensation drive circuit connect with LED light string, including after being used to carry out rectification to input AC electricity output line voltage to LED light string
Rectification module, further include sampling module, reference voltage module, delay compensation module and constant current source module；By sampling module pair
Line voltage is sampled, and exports sample rate current according to sampled voltage, and delay compensation module is being delayed according to the sample rate current
The compensation electric current of consecutive variations, and the benchmark electricity exported to reference voltage module according to the compensation electric current are exported after preset time
Pressure is modulated rear output reference voltage to constant current source module, controls the constant current source module and carries out constant current to the LED light string
Driving.By compensation of delay mode make after exporting sample rate current be delayed preset time export again consecutive variations compensation electricity
Stream, it is not in current break that time-lag action, which makes curent change slowly, effectively inhibits power supply self-excitation phenomena, improves LED and drives
Dynamic stability and safety.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of compensation of delay driving circuit, including be used for output line voltage after the progress rectification of input AC electricity to LED light string
Rectification module, which is characterized in that further include sampling module, reference voltage module, delay compensation module and constant current source module；By
Sampling module samples line voltage, and exports sample rate current according to sampled voltage, and delay compensation module is according to the sampling
Electric current exports the compensation electric current of consecutive variations after the preset time that is delayed, and defeated to reference voltage module according to the compensation electric current
The reference voltage gone out is modulated rear output reference voltage to constant current source module, controls the constant current source module to the LED light
String carries out constant current driving.
2. compensation of delay driving circuit according to claim 1, which is characterized in that the delay compensation module is specifically used for
The absolute value that consecutive variations and slope are exported after the preset time that is delayed according to the sample rate current is less than the compensation of predetermined threshold value
Electric current.
3. compensation of delay driving circuit according to claim 1, which is characterized in that the input terminal of the rectification module inputs
Alternating current, the anode of the output end connection LED light string of the rectification module, the input terminal of the sampling module connect the rectification
The output end of module or the cathode for connecting LED light string, the cathode of the LED light string is also connected with the constant current source module, described
The output end of sampling module connects the 1st end of the delay compensation module, and the 2nd end of the delay compensation module connects the base
Quasi- voltage module, the 3rd end of the time delay module connect the control terminal of the constant current source module.
4. compensation of delay driving circuit according to claim 3, which is characterized in that the sampling module includes first resistor
With the first metal-oxide-semiconductor；One end of the first resistor is the input terminal of the sampling module, connects the output end of the rectification module
Or the cathode of connection LED light string, the other end of the first resistor connect the drain electrode of the first metal-oxide-semiconductor；First metal-oxide-semiconductor
Grid is the output end of the sampling module, and the 1st end of the drain electrode and the delay compensation module of the first metal-oxide-semiconductor of connection is described
The source electrode of first metal-oxide-semiconductor is grounded.
5. compensation of delay driving circuit according to claim 3, which is characterized in that the delay compensation module includes second
Resistance, 3rd resistor, the 4th resistance, capacitance and the second metal-oxide-semiconductor；One end of the second resistance is the delay compensation module
1st end connects the output end of the sampling module, one end of the other end connection capacitance of the second resistance and the second metal-oxide-semiconductor
Grid；The drain electrode of second metal-oxide-semiconductor is the 3rd end of the delay compensation module, connects the control of the constant current source module
It holds, one end of one end of 3rd resistor and the 4th resistance；The other end of the 3rd resistor is the 2 of the delay compensation module
End, connects the reference voltage module；The other end of the other end of the capacitance, the source electrode of the second metal-oxide-semiconductor and the 4th resistance is equal
Ground connection.
6. compensation of delay driving circuit according to claim 3, which is characterized in that the delay compensation module includes third
Resistance, the 4th resistance, capacitance and the second metal-oxide-semiconductor；The source electrode of second metal-oxide-semiconductor is the 1st end of the delay compensation module, even
Connect the output end of the sampling module, the drain electrode of second metal-oxide-semiconductor is the 3rd end of the delay compensation module, described in connection
One end of capacitance, one end of 3rd resistor, the 4th resistance one end and the constant current source module control terminal；The 3rd resistor
The other end be the delay compensation module the 2nd end, connect the reference voltage module；The other end of the capacitance, second
The other end of the source electrode of metal-oxide-semiconductor and the 4th resistance is grounded.
7. compensation of delay driving circuit according to claim 3, which is characterized in that the constant current source module includes that operation is put
Big device, third metal-oxide-semiconductor and the 5th resistance；The in-phase input end of the operational amplifier is the control terminal of the constant current source module,
Connect the 3rd end of the compensating module, the source electrode and four or five electricity of the inverting input connection third metal-oxide-semiconductor of the operational amplifier
One end of resistance, the grid of the output end connection third metal-oxide-semiconductor of the operational amplifier；The drain electrode of the third metal-oxide-semiconductor connects LED
The cathode of lamp string；The other end of 5th resistance is grounded.
8. a kind of compensation of delay driving method, which is characterized in that include the following steps：
Line voltage is sampled by sampling module, and sample rate current is exported according to sampled voltage；
Delay compensation module exports the compensation electric current of consecutive variations according to the sample rate current after the preset time that is delayed, and according to
The reference voltage that the compensation electric current exports reference voltage module is modulated rear output reference voltage to constant current source module；
The constant current source module carries out constant current driving to the LED light string.
9. compensation of delay driving method according to claim 8, which is characterized in that the delay compensation module is according to
Sample rate current exports the step of compensation electric current of consecutive variations after the preset time that is delayed and specifically includes：
The absolute value that delay compensation module exports consecutive variations and slope according to the sample rate current after the preset time that is delayed is small
In the compensation electric current of predetermined threshold value.
10. a kind of LED drive device, including shell, it is provided with pcb board in the shell, which is characterized in that on the pcb board
It is arranged just like the compensation of delay driving circuit described in claim 1-7 any one.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810257690.7A CN108282934A (en) | 2018-03-27 | 2018-03-27 | LED drive device and compensation of delay driving circuit, driving method |
| PCT/CN2019/077149 WO2019184668A1 (en) | 2018-03-27 | 2019-03-06 | Led driving device, delayed compensation driving circuit, and driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810257690.7A CN108282934A (en) | 2018-03-27 | 2018-03-27 | LED drive device and compensation of delay driving circuit, driving method |
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| CN108282934A true CN108282934A (en) | 2018-07-13 |
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| CN201810257690.7A Pending CN108282934A (en) | 2018-03-27 | 2018-03-27 | LED drive device and compensation of delay driving circuit, driving method |
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| Country | Link |
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| WO (1) | WO2019184668A1 (en) |
Cited By (5)
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| CN108922472A (en) * | 2018-08-14 | 2018-11-30 | 上海艾为电子技术股份有限公司 | Driving method, driving circuit, compensation circuit and light adjusting system |
| CN110177410A (en) * | 2019-05-24 | 2019-08-27 | 深圳市晟碟半导体有限公司 | A kind of LED light adjusting circuit, dimming device and light-dimming method |
| WO2019184668A1 (en) * | 2018-03-27 | 2019-10-03 | 深圳市晟碟半导体有限公司 | Led driving device, delayed compensation driving circuit, and driving method |
| CN113825279A (en) * | 2021-11-25 | 2021-12-21 | 上海南麟电子股份有限公司 | LED driving system and driving method thereof |
| CN115102395A (en) * | 2022-08-22 | 2022-09-23 | 华海通信技术有限公司 | Power adjusting circuit, voltage adjusting method and seabed observation network system |
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| CN114126148B (en) * | 2020-08-31 | 2024-06-25 | 美芯晟科技(北京)股份有限公司 | Driving circuit for realizing line voltage compensation and LED circuit |
| CN112105123B (en) * | 2020-10-19 | 2024-01-23 | 美芯晟科技(北京)股份有限公司 | Low-power-consumption constant-current control circuit and method |
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| Publication number | Publication date |
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| WO2019184668A1 (en) | 2019-10-03 |
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