CN206164935U - LED driving circuit - Google Patents
LED driving circuit Download PDFInfo
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- CN206164935U CN206164935U CN201621294547.8U CN201621294547U CN206164935U CN 206164935 U CN206164935 U CN 206164935U CN 201621294547 U CN201621294547 U CN 201621294547U CN 206164935 U CN206164935 U CN 206164935U
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Abstract
The utility model discloses a LED driving circuit, include power module, be used for boost circuit, single -chip module and drive module for LED lamp load power supply, power module is connected with single -chip module and drive module respectively, thereby does single -chip module and drive module power supply, its characterized in that: drive circuit is still including being used for the sampling the voltage signal of boost circuit output and current signal, the signal feedback that will sample are given single -chip module's output sampling module, drive module with thereby the single -chip module connection can be received single -chip module is according to the control signal of the feedback signal formation of output sampling module, thereby boost circuit also is connected with drive module and receives drive module is according to control signal generation's drive signal to the regulation offers the output voltage of LED lamp load.
Description
Technical field
This utility model is related to LED technology field, especially a kind of LED drive circuit.
Background technology
LED has that luminous efficiency is high from after entering the illumination epoch, due to it, energy-saving effect substantially, life-span length, it is pollution-free,
The remarkable advantages such as anti-vibration, are increasingly subject to the attention of industry.Along with the extensive application of solaode and accumulator, direct current
LED drives demand increasingly to increase.
At present conventional LED type of drive has 1) constant pressure to drive：Such as the Chinese patent of Application No. 201610357571.X
A kind of disclosed white light LEDs constant-voltage driving power source, mainly by diode rectifier U, transformator T, control chip U1, amplifier
P1, resistance R4, resistance R3, resistance R5, Zener diode D4, are input into anti-jamming circuit, and gate driver circuit and constant pressure are exported
Circuit is constituted, and input voltage can be adjusted so as to which output voltage is maintained in constant scope；2) constant-current driving：Such as
A kind of constant-current drive circuit for LED disclosed in the Chinese patent of Application No. 200510034449.0, including power input
End and LED load unit, the series connection one between power input and LED load unit is used to control to stablize defeated from power input
Enter and flow through the pre- constant current unit of the operating current of LED load unit, the constant-current drive circuit for LED also includes a LED mistakes
Stream dividing cell, it is in parallel with LED load unit, when the operating current Jing after the pre- constant current of pre- constant current unit is higher than LED load list
During the rated operational current of unit, LED excessively stream dividing cells distributary division point operating current is electric with the work for flowing through LED load unit
Stream is stable at rated operational current.
But due to LED own characteristics, its driving has certain technological challenge compared with electric filament lamp, mainly there is following difficult point：
One：The non-linear of LED causes small driving voltage change to cause huge drive current variations, and
LED has higher negative voltage/temperature coefficient, therefore the mode that constant pressure drives it cannot be guaranteed that LED steady operations；And constant-current driving
Though LED lamp steady operation can be made, due to temperature influence, the running voltage at LED two ends can be continually changing, LED lamp
Power also just changes therewith.
Two：LED lamp typically using single LEDs string and by the way of increasing power, but the LED of different manufacturers different model
Light fixture string and mode are simultaneously differed, and same nominal power rated operational voltage is inconsistent, and this requires that LED drive circuit has
Adaptive ability, i.e., no matter LED lamp rated operational voltage how much, can be operated on nominal power.
Utility model content
Technical problem to be solved in the utility model is the problem existed for above-mentioned prior art, there is provided a kind of high-precision
The LED drive circuit of degree self-adaption constant power.
This utility model solve the technical scheme that adopted of above-mentioned technical problem for：A kind of LED drive circuit, including power supply
Module, for for the booster circuit of LED load supplying, one-chip computer module and drive module, the supply module respectively with list
Piece machine module and drive module connect, so as to being that the one-chip computer module and drive module are powered；It is characterized in that：The driving
Circuit also includes the voltage signal and current signal for the booster circuit output of sampling and feeds back to the signal for sampling
The output sampling module of the one-chip computer module；The drive module is connected with the one-chip computer module, so as to receive
The control signal that the one-chip computer module is generated according to the feedback signal of output sampling module；The booster circuit also with drive
Dynamic model block connection, so as to receive the drive signal that the drive module is generated according to control signal, with regulation be supplied to LED
The output voltage of load.
Preferably, the output sampling module is resistance sampling circuit.
Preferably, for ease of sampled voltage and current signal, the resistance sampling circuit includes voltage sample circuit and electricity
Stream sample circuit, the booster circuit includes being connected to the first outfan and second output of LED load positive and negative electrode
End；The voltage sample circuit includes the first resistor and second resistance of series connection, and the voltage sample circuit is connected in parallel on a liter piezoelectricity
The voltage signal of feedback is exported between first output and ground on road and between first resistor and second resistance；It is described
Current sampling circuit includes 3rd resistor, the 3rd resistor is connected between the second output and ground of booster circuit,
And in the current signal of one end output feedback being connected with the second outfan.
Preferably, for ease of adjusting voltage, the drive module is the PWM controller of fixed frequency current-mode.
Preferably, the booster circuit is boost type DC-DC booster circuits, and by formula D=(Vo-Vi)/Vo boosting is adjusted
The output voltage of circuit, wherein D are the dutycycle of the drive signal of the drive module output, and Vo is the defeated of the booster circuit
Go out voltage, Vi is the input voltage of the booster circuit.
For ease of powering to booster circuit and supply module, also including DC source, the DC source and the power supply
Module and booster circuit connect.
Compared with prior art, the utility model has the advantage of：By booster circuit output of sampling to the voltage of load
Signal and current signal, the power that one-chip computer module obtains loading according to the voltage and current signal of change, with setting power phase
Than exporting positive feedback or negative feedback so that the power stability of load near setting power, whole control formed one it is benign
Feedback mechanism, enabling the concordance for ensureing to export in the load of certain change is effectively ensured, and then reaches high accuracy
Self-adaption constant power drive, versatility high reliability is good.
Description of the drawings
Fig. 1 is the structural representation of LED drive circuit of the present utility model；
Fig. 2 is the circuit diagram of the supply module for being this utility model preferred implementation；
Fig. 3 for the booster circuit of this utility model preferred implementation circuit diagram, including output sampling module；
Fig. 4 is the circuit diagram of the one-chip computer module of this utility model preferred implementation；
Fig. 5 is the circuit diagram of the drive module of this utility model preferred implementation.
Specific embodiment
This utility model is described in further detail below in conjunction with accompanying drawing embodiment.
Referring to Fig. 1, a kind of LED drive circuit, including supply module 1, booster circuit 2, one-chip computer module 3, drive module 4
With output sampling module 5.Output sampling module 5 is connected to the input of one-chip computer module 3, drive module 4 it is defeated
Enter the outfan that end is connected to one-chip computer module 3, the input of booster circuit 2 is connected to the outfan of drive module 4.
DC source 6 is powered for booster circuit 2, and is that drive module 4 and one-chip computer module 3 are powered by supply module 1.
The outfan of booster circuit 2 is connected to LED load 7, so as to provide running voltage for LED load 7.Output sampling mould
Block 5 gathers voltage, the current signal between booster circuit 2 and LED load 7, feeds back to one-chip computer module 3.
Referring to Fig. 2, the input connection DC source 6 of supply module 1, the feeder ear Vin of DC source 6 is to supply module
The voltage of 1 input 12V, feeder ear Vin is connected to the first linear stabilivolt U1 by anti-reverse diode D1, from there through the
The 12V voltages voltage stabilizing that one linear voltage stabilization pipe U1 is input into DC source 6, to the voltage of 9V, is that drive module 4 is powered.First is linear
Stabilivolt U1 is connected to the second linear voltage stabilization pipe U2, is that one-chip computer module 3 is powered so as to the voltage of voltage stabilizing to 3.3V.
Referring to Fig. 3, booster circuit 2 adopts boost type DC-DC booster circuits, booster circuit 2 to include being connected to LED
First output end vo ut of the positive pole of lamp load 7 loads the second outfan Gout of 7 negative poles with LED is connected to.DC source 6
Feeder ear Vin is after boosting, by the first output end vo ut of booster circuit 2, so as to give the power supply (connection of LED load 7
The positive pole of LED load 7).Booster circuit 2 also has driving signal input and current-mode feedback input end, drive signal
Input is connected to the grid of metal-oxide-semiconductor field effect transistor Q1 by resistance R4, and the drain electrode of metal-oxide-semiconductor field effect transistor Q1 is connected to diode D2's
Positive pole, the negative pole of diode D2 is connected to the first output end vo ut of booster circuit 2, and current-mode feedback input end ISE passes through
Resistance R5 is connected to the source electrode of metal-oxide-semiconductor field effect transistor Q1, and the two ends of resistance R5 are grounded by electric capacity C1 and resistance R6.
Output sampling module 5 is in the present embodiment resistance sampling circuit, including voltage sample circuit and electric current take
Sample circuit, voltage sample circuit includes first resistor R1 and second resistance R2, after first resistor R1 and the series connection of second resistance R2 simultaneously
It is connected between the first output end vo ut of booster circuit 2 and earth terminal GND, the voltage Vo partial pressures that the first output end vo ut is exported
Voltage signal VO (the power taking pressure between first resistor R1 and second resistance R2) afterwards is delivered to one-chip computer module 3.Current sampling
Circuit includes 3rd resistor R3, one end connection earth terminal GND of 3rd resistor R3, other end connection booster circuit 2 it is second defeated
Go out and hold Gout, the second outfan Gout is connected to LED load 7 and loads, that is to say, that 3rd resistor R3 is connected on LED and bears
Carry between 7 negative poles and earth terminal GND.Take 3rd resistor R3 and load the voltage of 7 one end with LED, by Ohm's law, by voltage
Signal is converted to current signal IO and is delivered to one-chip computer module 3.
Referring to Fig. 4, one-chip computer module 3 includes single-chip microcomputer U3, the second linear voltage stabilization pipe U2 voltage stabilizings of above-mentioned supply module 1
3.3V voltages afterwards are powered for single-chip microcomputer U3.Voltage signal VO, the current signal IO difference transmitted by output sampling module 5
It is connected to ADC (digital-to-analogue conversion) foot of single-chip microcomputer U3.General, in order to reach high-precision requirement, the essence of the ADC feet of single-chip microcomputer U3
Degree recommends more than 12.The representative LED sampled in the ADC feet of single-chip microcomputer U3 loads the voltage signal VO of 7 voltages and electric current
After current signal IO, power is calculated, then compared with the predetermined power being stored in single-chip microcomputer U3, corresponding Jing single-chip microcomputers U3
DAC (analog digital conversion) foot output control signal VFB (voltage signal).General, in order to reach high-precision requirement, single-chip microcomputer
The DAC feet precision of U3 recommends more than 12.If the power for calculating is more than the predetermined power, the output of DAC feet
Control signal VFB is incremented by；If the power for calculating is less than the predetermined power, control signal VFB of DAC feet output
Successively decrease.
Referring to Fig. 5, including master chip U4, it is fixed frequency current mode pwm controller, the first above-mentioned linear stabilivolt
9V voltages after U1 voltage stabilizings are powered for master chip U4, and the DAC feet of single-chip microcomputer U3 are connected to the input of master chip U4, so as to monolithic
Control signal VFB of machine module 3 can be delivered to drive module 4.The drive signal outfan OUT of master chip U4 is PWM control letters
Number outfan, is connected to the driving signal input of booster circuit 2 to its output drive signal DRV, and frequency immobilizes, duty
Than changing.In the case of not excessively stream, drive signal DRV dutycycles are controlled by control signal VFB, and control signal VFB is more than
During the internal reference voltage Vref of master chip U4, drive signal DRV dutycycles can be reduced；Control signal VFB is less than master chip U4
Internal reference voltage Vref when, drive signal DRV dutycycles can increase.
Control signal VFB dutycycle D, the input voltage Vi of the input of booster circuit 2, the outfan of booster circuit 2 first
The output voltage Vo relations of Vout meet equation below：D=(Vo-Vi)/Vo, when Vi is constant, can by adjusting control signal
It is corresponding to adjust Vo voltages.ISE ends are current-mode feedback signal, are directly connected to the drive module current feedback terminal.Such as
Control signal VFB dutycycle D is 50%, then when input voltage Vi is 12V, output voltage is 24V.
The operation principle of the present embodiment is as follows：
(1) electricity on
After upper electricity, DC source 6 supplies unidirectional current to be input into from Vin, GND seam, after anti-reverse diode D1, shape
Into the slightly below unidirectional current of Vin, the unidirectional current obtains 9V unidirectional currents after the first linear stabilivolt U1 voltage stabilizings, and 9V direct currents are supplied electricity to
Drive module 4 is powered, and now the input terminal voltage of drive module 4 is higher than internal reference, the output pwm control signal of drive module 4
Dutycycle is that 0, Vo is equal to Vi, and now LED load 7 is not because Vo voltages not enough have electric current.
(2) gradually boost
First linear stabilivolt U1 obtains 3.3V unidirectional currents Jing after the second linear voltage stabilization pipe U4 voltage stabilizings for 9V unidirectional currents,
3.3V direct currents supply electricity to single-chip microcomputer U3 and power, and bring into operation corresponding program on single-chip microcomputer U3 after electricity, by output sampling module 5
Sampled voltage signal VO and current signal IO, because LED load 7 is 0 without electric current, now output when upper electric,
Setting power is necessarily smaller than, single-chip microcomputer U3 accordingly successively decreases control signal VFB until control signal VFB is less than inside by DAC feet
Reference voltage V ref, the output PMW signal dutyfactors of drive module 4 are incremented by, and the output voltage Vo of booster circuit 2 is incremented by.In this mistake
Cheng Zhong, no matter LED load 7 running voltages be it is how many, all can by way of voltage is gradually lifted self adaptation.
(3) it is stable
As output voltage Vo is incremented by, can be gradually increasing by the electric current of LED load 7, power also can be gradually increasing,
When LED 7 power of load reach set power in single-chip microcomputer U3, single-chip microcomputer U3 passes through voltage signal VO and current signal IO
The power of LED load 7 can be measured, because setting power is equal with the power of LED load 7, the DAC feet of single-chip microcomputer U3 are no longer
Reduce the magnitude of voltage of control signal VFB.Next rise again if as the power of other reason LED loads 7, then single-chip microcomputer
The DAC feet of U3 will lift the magnitude of voltage of control signal VFB, and by drive module 4 pwm signal dutycycle is reduced, then reduce output
Voltage Vo, the power of LED load 7 also can decline；Next decline again if as the power of other reason LED loads 7,
Then the DAC feet of single-chip microcomputer U3 will reduce the magnitude of voltage of control signal VFB, and by drive module 4 pwm signal dutycycle is increased, then
Output voltage Vo is lifted, the power of LED load 7 also can increase.So repeatedly, it is ensured that LED loads 7 power and finally setting
Determine near power repeatedly, reached the purpose of invariable power.
Claims (6)
1. a kind of LED drive circuit, including supply module (1), the booster circuit (2) for loading (7) power supply for LED, list
Piece machine module (3) and drive module (4), the supply module (1) is connected respectively with one-chip computer module (3) and drive module (4),
So as to be the one-chip computer module (3) and drive module (4) power supply；It is characterized in that：
The drive circuit also includes the voltage signal (VO) and current signal for the booster circuit (2) output of sampling
(IO) and by the signal for sampling the output sampling module (5) of the one-chip computer module (3) is fed back to；
The drive module (4) is connected with the one-chip computer module (3), so as to receive the one-chip computer module (3) according to defeated
Go out the control signal (VFB) that the feedback signal of power samples module (5) is generated；The booster circuit (2) also with drive module (4)
Connection, so as to receive the drive signal (DRV) that the drive module (4) is generated according to control signal (VFB), to adjust offer
The output voltage (Vo) of (7) is loaded to LED.
2. LED drive circuit as claimed in claim 1, it is characterised in that：The output sampling module (5) takes for resistance
Sample circuit.
3. circuit LED drive circuit according to claim 2, it is characterised in that：The resistance sampling circuit includes voltage
Sample circuit and current sampling circuit, the booster circuit (2) including be connected to LED load (7) positive and negative electrode first
Outfan (Vout) and the second outfan (Gout)；The voltage sample circuit is electric including the first resistor (R1) connected and second
Resistance (R2), the voltage sample circuit is connected in parallel between first outfan (Vout) of booster circuit (2) and earth terminal (GND),
And export the voltage signal (VO) of feedback between first resistor (R1) and second resistance (R2)；The current sampling circuit includes
3rd resistor (R3), the 3rd resistor (R3) is connected on second outfan (Gout) and earth terminal (GND) of booster circuit (2)
Between and be connected with the second outfan (Gout) one end output feedback current signal (IO).
4. the LED drive circuit as any one of claims 1 to 3, it is characterised in that：The drive module (4) is solid
Determine the PWM controller of frequency current mode.
5. LED drive circuit as claimed in claim 4, it is characterised in that：The booster circuit (2) is boost type DC-DC liters
Volt circuit, by formula D=(Vo-Vi)/Vo the output voltage (Vo) of booster circuit (2) is adjusted, and wherein D is the drive module
(4) dutycycle of the drive signal (DRV) of output, Vo is the output voltage of the booster circuit (2), and Vi is the booster circuit
(2) input voltage.
6. the LED drive circuit as any one of claims 1 to 3, it is characterised in that：Also include DC source (6), institute
State DC source (6) to be connected with the supply module (1) and booster circuit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621294547.8U CN206164935U (en) | 2016-11-29 | 2016-11-29 | LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621294547.8U CN206164935U (en) | 2016-11-29 | 2016-11-29 | LED driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206164935U true CN206164935U (en) | 2017-05-10 |
Family
ID=58661307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621294547.8U Expired - Fee Related CN206164935U (en) | 2016-11-29 | 2016-11-29 | LED driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206164935U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712801A (en) * | 2018-06-27 | 2018-10-26 | 深圳市明微电子股份有限公司 | A kind of the Constant-power drive circuit and device of wide input voltage |
-
2016
- 2016-11-29 CN CN201621294547.8U patent/CN206164935U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712801A (en) * | 2018-06-27 | 2018-10-26 | 深圳市明微电子股份有限公司 | A kind of the Constant-power drive circuit and device of wide input voltage |
| CN108712801B (en) * | 2018-06-27 | 2023-09-29 | 深圳市明微电子股份有限公司 | Constant power driving circuit and device with wide input voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170510 Termination date: 20211129 |
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| CF01 | Termination of patent right due to non-payment of annual fee |