CN105188232B - Constant current driver circuit for LED, light adjusting circuit and its control method - Google Patents
Constant current driver circuit for LED, light adjusting circuit and its control method Download PDFInfo
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Abstract
The invention discloses a kind of LED constant current light adjusting circuit, it includes switch power module, the voltage sample module for gathering output voltage, the current sample module for gathering output current, the control module being connected with voltage sample module and current sample module and the voltage-regulation feedback module being connected with control module and switch power module for being used to power for LED load；Wherein, control module is used to adjust the reference voltage exported to voltage-regulation feedback module according to the output voltage from voltage sample module and the output current from current sample module, and voltage-regulation feedback module is used to produce corresponding voltage adjustment signal according to reference voltage and feeds back to switch power module so that switch power module adjusts output voltage.The present invention adjusts output voltage in real time by detecting output current, and to reach the effect for setting the maximum constant currents of LED, its is simple in construction and efficiency is higher.Meanwhile, present invention also offers corresponding LED constant current light adjusting circuit and its control method.
Description
Technical field
The present invention relates to LED illumination control technology field, relate more specifically to a kind of constant current driver circuit for LED, light modulation electricity
Road and its control method.
Background technology
The various places that LED illumination is widely applied in daily life the advantages of its energy-saving and environmental protection.Wherein, it is adjustable
The characteristics of light is even more a big advantage of LED illumination.At present, conventional LED lamp light adjusting circuit is essentially all using prime direct current
Constant pressure (CV) is exported, and coordinates rear class constant current regulator (DC-CC) to realize.This scheme is due to needing two-stage, it is assumed that every grade
Conversion efficiency reaches 0.9, then by after two-stage, i.e. power supply whole efficiency highest 0.9*0.9=0.81, efficiency compared with
It is low.If moreover, to realize that multichannel is dimmed, then needing every road to be equipped with a constant current regulator (DC-CC), controlled per road during light modulation
The output current size of corresponding constant current regulator, this will cause circuit structure complex, and cost is higher.
In consideration of it, be necessary to provide a kind of simple circuit and the higher constant current driver circuit for LED of efficiency and light adjusting circuit with
And a kind of circuit control method for improving efficiency and simplifying circuit structure is provided, so as to solve the defect of prior art.
The content of the invention
A technical problem to be solved by this invention is to provide the LED constant current driving that a kind of circuit is simple and efficiency is higher
Circuit.
Another technical problem to be solved by this invention is to provide the LED constant current light modulation that a kind of circuit is simple and efficiency is higher
Circuit.
Another technical problem to be solved by this invention is to provide a kind of circuit for improving efficiency and simplifying circuit structure
Control method.
In order to solve the above problems, the present invention provides a kind of constant current driver circuit for LED, for carrying out constant current to LED load
Driving.The constant current driver circuit for LED include switch power module, voltage sample module, current sample module, control module and
Voltage-regulation feedback module；Wherein, it is that at least LED load is powered all the way that the switch power module, which is used for,；The voltage sample
Module is connected with the switch power module, the output voltage for gathering the switch power module；The current sample mould
Block is connected with the LED load, and output current to LED load is exported for gathering the switch power module；The control
Module is connected with the voltage sample module, current sample module and voltage-regulation feedback module, for according to from the electricity
The output voltage of sampling module and the output current from the current sample module is pressed to adjust output to the voltage-regulation
The reference voltage of feedback module；The voltage-regulation feedback module is connected with the switch power module, for according to from institute
The reference voltage for stating control module produces corresponding voltage adjustment signal and the voltage adjustment signal is fed back into the switch electricity
Source module is so that the switch power module adjusts output voltage.
Preferably, the current sample module includes an at least current-limiting resistance, and each current-limiting resistance is series at all the way
In LED load；The voltage sample module includes two partial pressure branch roads parallel with one another, and each partial pressure branch road includes two and mutually gone here and there
The divider resistance of connection.
Preferably, the control module is provided with a voltage sample input, a D/A output ends and an at least current sample
Input；Wherein, the voltage sample input is connected to two partial pressures of a partial pressure branch road in the voltage sample module
Between resistance, the D/A output ends are connected to the input of the voltage-regulation feedback module, each current sample input
End is connected to one end of current-limiting resistance in LED load all the way.
Preferably, the voltage-regulation feedback module includes voltage error amplifier and photoelectrical coupler；Wherein, the electricity
Error amplifier is pressed to include operational amplifier and supplementary network, wherein, the compensation network is parallel to the operational amplifier
Between inverting input and output end, the inverting input is connected to another partial pressure branch road in the voltage sample module
Between two divider resistances, the in-phase input end is connected to the D/A output ends of the control module；The photoelectrical coupler
Anode connects supply voltage by a first resistor, and its negative electrode is connected to the output end of the voltage error amplifier, the light
The colelctor electrode and emitter stage of electric coupler are all connected to the switch power module.
In order to solve the above problems, the present invention also provides a kind of LED constant current light adjusting circuit, permanent for being carried out to LED load
Stream driving and light modulation.The LED constant current light adjusting circuit includes switch power module, voltage sample module, current sample module, control
Module, voltage-regulation feedback module and switch module；Wherein, the switch power module is used to be at least LED load all the way
Power supply；The voltage sample module is connected with the switch power module, the output electricity for gathering the switch power module
Pressure；The current sample module is connected with the LED load, is exported for gathering the switch power module to LED load
Output current；The control module is connected with the voltage sample module, current sample module and voltage-regulation feedback module, uses
In defeated to adjust according to the output voltage from the voltage sample module and the output current from the current sample module
Go out the reference voltage to the voltage-regulation feedback module；The voltage-regulation feedback module and the switch power module phase
Even, for producing corresponding voltage adjustment signal and by the voltage adjustment signal according to the reference voltage from the control module
The switch power module is fed back to so that the switch power module adjusts output voltage；The switch module includes at least one
Individual switching device, each switching device correspondence is series in LED load all the way and is controlled by the control module, the control
Molding block is dimmed by exporting pwm control signal to the switching device with realizing to the LED load.
Preferably, the current sample module includes an at least current-limiting resistance, and each current-limiting resistance is series at all the way
In LED load；The voltage sample module includes two partial pressure branch roads parallel with one another, and each partial pressure branch route two divider resistances
It is in series.
Preferably, the control module is defeated provided with a voltage sample input, a D/A output ends, an at least current sample
Enter end and an at least PWM output ends；Wherein, the voltage sample input is connected to a partial pressure in the voltage sample module
Between two divider resistances of branch road, the D/A output ends are connected to the input of the voltage-regulation feedback module, Mei Gesuo
One end that current sample input is connected to current-limiting resistance in LED load all the way is stated, each PWM output ends are connected to all the way
The control end of switching device in LED load.
Preferably, the voltage-regulation feedback module includes voltage error amplifier and photoelectrical coupler；Wherein, the electricity
Error amplifier is pressed to include operational amplifier and supplementary network, wherein, the compensation network is parallel to the operational amplifier
Between inverting input and output end, the inverting input is connected to another partial pressure branch road in the voltage sample module
Between two divider resistances, the in-phase input end is connected to the D/A output ends of the control module；The photoelectrical coupler
Anode connects supply voltage by a first resistor, and its negative electrode is connected to the output end of the voltage error amplifier, the light
The colelctor electrode and emitter stage of electric coupler are all connected to the switch power module.
In order to solve the above problems, the present invention also provides a kind of control method based on above-mentioned LED constant current light adjusting circuit, its
Comprise the following steps：
S1：A default reference voltage is exported to voltage-regulation feedback module and measures the output of switch power module simultaneously
Voltage and output current；
S2：Judge whether the output voltage exceedes predetermined maximum voltage value, if then closing switch power module is defeated
Go out, otherwise carry out next step S3；
S3：Judge whether the output current is equal to pre-set current value, if then carrying out next step S4, otherwise increase defeated
Go out the reference voltage and return to step S2 to voltage-regulation feedback module；
S4：Detect whether to receive from outside dimming control signal, if then exporting corresponding pwm control signal
Enter next step S5 afterwards, otherwise directly carry out next step S5；
S5：Judge whether output current is equal to pre-set current value, if then return to step S4, otherwise carry out next step
S6；
S6：Adjust the reference voltage；
S7：Judge whether the output voltage exceedes predetermined maximum voltage value, if then closing switch power module is defeated
Go out, otherwise return to step S5.
Compared with prior art, constant current driver circuit for LED provided by the present invention, by setting voltage sample module, electricity
Sampling module is flowed to detect the output voltage and output current in circuit respectively, and under the control of control module, can be according to institute
The real-time adjustment circuit output voltage of size of current detected, to reach the effect for setting the maximum constant currents of LED, while monitoring output
Voltage is to provide overvoltage protection.Based on building for above-mentioned simple circuit structure, it is only necessary to control module is carried in advance in production
Enter the purpose that regulation maximum current can be achieved in corresponding control program, increase substantially production efficiency and circuit operating efficiency, band
Carry out good economic benefit.Meanwhile, LED constant current light adjusting circuit provided by the present invention tandem tap only in the load of every paths of LEDs
Device, the light-modulating mode (i.e. PWM light modulations) that can be achieved to switch based on high-speed switch by the switch of controlling switch device, it is tied
Structure is simple, and efficiency is higher, and product cost is relatively low.In addition, circuit control method provided by the present invention can improve efficiency and simplification
Circuit structure, saves product cost.
By following description and with reference to accompanying drawing, the present invention will become more fully apparent, and these accompanying drawings are used to explain the present invention
Embodiment.
Brief description of the drawings
Fig. 1 illustrates the circuit box structure of the embodiment of constant current driver circuit for LED one of the present invention.
Fig. 2 illustrates the circuit box structure of the embodiment of LED constant current light adjusting circuit one of the present invention.
Fig. 3 illustrates the physical circuit figure of LED constant current light adjusting circuit shown in Fig. 2.
Fig. 4 is the flow chart of LED constant current light adjusting circuit control method of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely retouched
State, similar reference numerals represent similar component in accompanying drawing.Obviously, embodiment explained below is only the present invention one
Divide embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, belongs to the scope of protection of the invention.
Fig. 1 illustrates an embodiment of constant current driver circuit for LED of the present invention.
With reference first to Fig. 1, the constant current driver circuit for LED 10 of the present embodiment is used to carry out constant current driving to LED load.Should
Constant current driver circuit for LED 10 includes switch power module 11, voltage sample module 12, current sample module 13, control module 14
And voltage-regulation feedback module 15；Wherein, it is that at least LED load is powered all the way that the switch power module 11, which is used for,；It is described
Voltage sample module 12 is connected with the switch power module 11, the output voltage for gathering the switch power module 11；
The current sample module 13 is connected with the outlet side of the switch power module 11, for gathering the switch power module 11
Export the output current to LED load；The control module 14 and the voltage sample module 12, current sample module 13 and electricity
Pressure regulation feedback module 15 is connected, for the output voltage and the current sample gathered according to the voltage sample module 12
The output current that module 13 is gathered adjusts reference voltage of the output to the voltage-regulation feedback module 15；The voltage is adjusted
Section feedback module 15 is connected with the switch power module 11, for being produced according to the reference voltage from the control module 14
The voltage adjustment signal is simultaneously fed back to the switch power module 11 so that the Switching Power Supply by corresponding voltage adjustment signal
Module 11 adjusts output voltage.
Fig. 2 is the block diagram of the embodiment of LED constant current light adjusting circuit one of the present invention.Reference picture 2, LED constant current of the invention is adjusted
Optical circuit 20 is that an on-off circuit is set up on the basis of above-mentioned constant current driver circuit for LED 10 so as in the same of driving LED load
Shi Shixian brightness adjustment controls.In the present embodiment, the LED constant current light adjusting circuit 20 includes switch power module 21, voltage sample mould
Block 22, current sample module 23, control module 24, voltage-regulation feedback module 25 and switch module 26.Wherein, the switch
It is that at least LED load is powered all the way that power module 21, which is used for,；The voltage sample module 22 and the phase of switch power module 21
Even, the output voltage for gathering the switch power module 21；The current sample module 23 and the switch power module
21 outlet side is connected, and output current to LED load is exported for gathering the switch power module 21；The control module
24 are connected with the voltage sample module 22, current sample module 23 and voltage-regulation feedback module 25, for according to the electricity
The output current that the output voltage that is gathered of pressure sampling module 22 and the current sample module 23 are gathered adjust export to
The reference voltage of the voltage-regulation feedback module 25；The voltage-regulation feedback module 25 and the phase of switch power module 21
Even, believe for producing corresponding voltage adjustment signal according to the reference voltage from the control module 24 and adjusting the voltage
Number the switch power module 21 is fed back to so that the switch power module 21 adjusts output voltage.The switch module 26 is wrapped
At least one switching device is included, each switching device correspondence is series in LED load all the way and is controlled by the control mould
Block 24, the control module 24 is adjusted by exporting pwm control signal to the switching device with realizing to the LED load
Light.
Reference picture 3, in the present embodiment, the output end three paths of LEDs load in parallel of the switch power module 21 (SMPS),
It is respectively three paths of LEDs lamp string Output1, Output2 and Output3.Correspondingly, the switch module 26 includes three switches
Device, in the present embodiment, the switching device select metal-oxide-semiconductor to provide preferable switch performance and reduce power consumption.Three
Metal-oxide-semiconductor Q1, Q2 and Q3 are correspondingly accessed in three paths of LEDs lamp string Output1, Output2 and Output3 and are controlled by the control
Module 24, the control module 24 by controlling three corresponding pwm control signals of metal-oxide-semiconductor Q1, Q2 and Q3 output respectively
Its break-make, so that the electric current in three paths of LEDs lamp string Output1, Output2 and Output3 is have adjusted respectively, it is final to realize light modulation
Effect.Understandably, in other embodiments, according to real needs, the switching device also can select triode to realize.
Correspondingly, the current sample module 23 includes three current-limiting resistances R11, R12 and R13, three current limliting electricity
Resistance R11, R12 and R13 are series at three paths of LEDs lamp string Output1, Output2 and Output3 respectively.In the present embodiment, it is described
Voltage sample module 22 include two partial pressure branch roads parallel with one another, first partial pressure branch route divider resistance R4 and R5 series connection and
Into second partial pressure branch route divider resistance R6 and R7 are in series.Understandably, each divide in the voltage sample module 22
Resistance quantity included by pressure branch road is not limited to two, in other embodiments, according to the configuration of actual circuit, can select three
Individual or more resistant series are formed.
In some embodiments, such as the present embodiment, the control module 24 is realized using single-chip microcomputer (MCU) U2.Should
Single-chip microcomputer U2 is provided with a voltage sample input AN3, a D/A (digital-to-analogue conversion) output ends DA0, three current sample inputs
AN0, AN1, AN2 and three PWM output ends PWM0, PWM1, PWM2.Wherein, the voltage sample input AN3 is connected to institute
State between two divider resistances R6 and R7 of voltage sample module 22 to obtain the output voltage of the switch power module 21；Institute
State D/A output ends DA0 and be connected to the input of the voltage-regulation feedback module 25 with to its output reference voltage；Described in three
Current sample input AN0, AN1, AN2 connect the load of three paths of LEDs respectively, wherein, current sample input AN0 is connected to MOS
Between pipe Q1 and current-limiting resistance R11, current sample input AN1 is connected between metal-oxide-semiconductor Q2 and current-limiting resistance R12, and electric current is adopted
Sample input AN2 is connected between metal-oxide-semiconductor Q3 and current-limiting resistance R13；Three PWM output ends be connected to metal-oxide-semiconductor Q1,
Q2 and Q3 control end.
In some embodiments, such as the present embodiment, the voltage-regulation feedback module 25 includes voltage error amplifier
With photoelectrical coupler OC1, wherein, the voltage error amplifier include operational amplifier U1A and compensation network 251, it is described mend
Repay network 251 to be parallel between the inverting input of the operational amplifier U1A and output end, the inverting input is connected to
In the voltage sample module 22 between two divider resistances R4 and R5, the in-phase input end is connected to the single-chip microcomputer U2's
D/A output ends DA0；The anode of the photoelectrical coupler OC1 is connected to by a first resistor R1 connection supply voltages, its negative electrode
Operational amplifier U1A output end, the colelctor electrode and emitter stage of the photoelectrical coupler OC1 are all connected to the Switching Power Supply mould
Block 21.In the present embodiment, the compensation network 251 includes the first electric capacity C1, the second electric capacity C2 and 3rd resistor R3, wherein,
The 3rd resistor R3 is in parallel with the first electric capacity C1 after being connected with the second electric capacity C2 and is parallel to the operational amplifier
Between U1A inverting input and output end, the compensation network 251 based on the design may be such that circuit stability and the speed of service
Reach preferable balance.Certainly, in other embodiments, according to the real needs of loop design, compensation network 251 also can be by list
Solely realized by the first electric capacity C1 or individually by 3rd resistor R3 connects with the second electric capacity C2.
Based on foregoing circuit structure, the operation principle of LED constant current light adjusting circuit of the present invention is as follows：When starting power up, monolithic
The reference voltage that machine U2 controls its D/A output end DA0 to be exported gradually increases from small to large, while being inputted by its current sample
Hold AN0, AN1, AN2 to monitor the electric current in No. three load circuits, keep D/A output ends DA0's when reaching setting electric current value
Output, LED normal works.After LED normal works, single-chip microcomputer U2 keeps the monitoring to electric current, if (can beyond pre-set current value
For an interval range) then it is finely adjusted, light modulation action is carried out if detecting from outside dimming control signal input, its
Middle dimming control signal includes but does not limit following methods：0-10V simulations light modulation, Wireless Light modulating, digital PWM light modulation etc..Monolithic
Machine U2 also output voltages of observation circuit while monitoring current, when output voltage exceedes predetermined maximum voltage value, then enter
Enter overvoltage protection state, close output.Wherein, pre-set current value is transported by rated current set in advance and current PWM duty cycle
Obtain.
Reference picture 4, present invention also offers a kind of control method based on above-mentioned LED constant current light adjusting circuit 20, its is specific
Comprise the following steps：
S1：A default reference voltage is exported to voltage-regulation feedback module and measures the output of switch power module simultaneously
Voltage and output current；
S2：Judge whether the output voltage exceedes predetermined maximum voltage value, if then closing switch power module 21
Output, otherwise carries out next step S3；
S3：Judge whether the output current is equal to pre-set current value, if then carrying out next step S4, otherwise increase defeated
Go out the reference voltage and return to step S2 to voltage-regulation feedback module；
S4：Detect whether to receive from outside dimming control signal, if then exporting corresponding pwm control signal
Enter next step S5 afterwards, otherwise directly carry out next step S5；
S5：Judge whether output current is equal to pre-set current value, if then return to step S4, otherwise carry out next step
S6；
S6：Reference voltage of the adjustment output to voltage-regulation feedback module；
S7：Judge whether the output voltage exceedes predetermined maximum voltage value, if then closing switch power module 21
Export, otherwise return to step S5.
Above-mentioned control process is to be used as executive agent by the control module 24 in LED constant current light adjusting circuit 20, is passed through
It is that relevant control can be achieved that control program is loaded into single-chip microcomputer U2.Wherein, default reference voltage is usually 0V or close to 0V
Small voltage value to avoid the occurrence of over-current phenomenon avoidance.Arrive after power-up before LED normal works, reference voltage constantly increases,
Until the output current that detects is equal to pre-set current value, now LED normal works, single-chip microcomputer U2 keeps the prison to output current
Control, if then carried out beyond pre-set current value (according to actual circuit feature, the pre-set current value is usually an interval range) micro-
Adjust, light modulation action is carried out if detecting from outside dimming control signal input, when output voltage exceedes default maximum
During magnitude of voltage, then into overvoltage protection state, output is closed.
As described above, constant current driver circuit for LED provided by the present invention, by setting voltage sample module, current sample
Module detects the output voltage and output current in circuit respectively, and under the control of control module, can be according to detected
The real-time adjustment circuit output voltage of size of current, to reach the effect for setting the maximum constant currents of LED, at the same monitor output voltage with
Overvoltage protection is provided.Based on building for above-mentioned simple circuit structure, it is only necessary to control module is loaded into advance in production corresponding
Control program is the purpose that regulation maximum current can be achieved, and increases substantially production efficiency and circuit operating efficiency, brings good
Economic benefit.Meanwhile, LED constant current light adjusting circuit provided by the present invention series switching devices only in the load of every paths of LEDs lead to
The light-modulating mode (i.e. PWM light modulations) switched based on high-speed switch can be achieved in the switch for crossing controlling switch device, and its is simple in construction,
Efficiency is higher, and product cost is relatively low.In addition, circuit control method provided by the present invention can improve efficiency and simplify circuit knot
Structure, saves product cost.
It should be noted that switch power module 11 in constant current driver circuit for LED 10 of the present invention, voltage sample module 12,
LED of the particular circuit configurations of current sample module 13, control module 14 and voltage-regulation feedback module 15 with the present invention
The concrete structure of related circuit module is essentially identical in constant-current drive circuit 20, and it uniquely differs only in institute in control module 14
The pin configuration (without configuring three PWM output ends) of the single-chip microcomputer of use and software control part are (without carrying out dimming portion
Control).
Wherein, the present invention in switch power module 11 and 21 mainly include input rectifying filter circuit, energy conversion circuit,
PWM controller and output rectifier and filter, its concrete structure and control principle are well known to the skilled person, herein
Repeat no more.
The drivable LED load of constant current driver circuit for LED 10 and constant current driver circuit for LED 20 of the present invention is not limited to above-mentioned
Situation described by embodiment, it can also be used for driving LED load, two paths of LED load or more LED loads all the way.
Above in association with most preferred embodiment, invention has been described, but the invention is not limited in implementation disclosed above
Example, and modification, equivalent combinations that the various essence according to the present invention are carried out should be covered.
Claims (10)
1. a kind of constant current driver circuit for LED, for carrying out constant current driving to LED load, it is characterised in that：The LED constant current is driven
Dynamic circuit includes switch power module, voltage sample module, current sample module, control module and voltage-regulation feedback mould
Block；Wherein,
It is that at least LED load is powered all the way that the switch power module, which is used for,；
The voltage sample module is connected with the switch power module, the output electricity for gathering the switch power module
Pressure；
The current sample module is connected with the LED load, is exported for gathering the switch power module to LED load
Output current；
The control module is connected with the voltage sample module, current sample module and voltage-regulation feedback module, for root
Adjusted according to the output voltage from the voltage sample module and the output current from the current sample module export to
The reference voltage of the voltage-regulation feedback module；
The voltage-regulation feedback module is connected with the switch power module, for according to the reference from the control module
Voltage produces corresponding voltage adjustment signal and the voltage adjustment signal is fed back into the switch power module so that described open
Powered-down source module adjusts output voltage；
Wherein, output voltage of the basis from the voltage sample module and the output electricity from the current sample module
Stream adjusts reference voltage of the output to the voltage-regulation feedback module, including：
S1：A default reference voltage is exported to the voltage-regulation feedback module and measures the switch power module simultaneously
Output voltage and output current；
S2：Judge whether the output voltage exceedes predetermined maximum voltage value, if then closing the defeated of the switch power module
Go out, otherwise go to S3；
S3:Judge whether the output current is equal to pre-set current value, if then keeping defeated to the voltage-regulation feedback module
The reference voltage gone out is constant, otherwise goes to S4；
S4：Increase the reference voltage exported to the voltage-regulation feedback module, and go to S2.
2. constant current driver circuit for LED as claimed in claim 1, it is characterised in that：The current sample module includes at least one
Current-limiting resistance, each current-limiting resistance is series in LED load all the way；The voltage sample module is parallel with one another including two
Partial pressure branch road, each partial pressure branch road include two divider resistances being serially connected.
3. constant current driver circuit for LED as claimed in claim 2, it is characterised in that：The control module is provided with a voltage sample
Input, a D/A output ends and an at least current sample input；Wherein, the voltage sample input is connected to described
In voltage sample module between two divider resistances of a partial pressure branch road, the D/A output ends are connected to the voltage-regulation
The input of feedback module, each current sample input is connected to one end of current-limiting resistance in LED load all the way.
4. constant current driver circuit for LED as claimed in claim 3, it is characterised in that：The voltage-regulation feedback module includes electricity
Error amplifier and photoelectrical coupler are pressed, wherein,
The voltage error amplifier includes operational amplifier and compensation network, wherein, the compensation network is parallel to the fortune
Between the inverting input and output end of calculating amplifier, the inverting input is connected to another in the voltage sample module
Between two divider resistances of partial pressure branch road, the in-phase input end of the operational amplifier is connected to the D/A of the control module
Output end；
The anode of the photoelectrical coupler connects supply voltage by a first resistor, and its negative electrode is connected to the voltage error and put
The output end of big device, the colelctor electrode and emitter stage of the photoelectrical coupler are all connected to the switch power module.
5. a kind of LED constant current light adjusting circuit, for carrying out constant current driving and light modulation to LED load, it is characterised in that：The LED
Constant-current dimming circuit includes switch power module, voltage sample module, current sample module, control module, voltage-regulation feedback
Module and switch module；Wherein,
It is that at least LED load is powered all the way that the switch power module, which is used for,；
The voltage sample module is connected with the switch power module, the output electricity for gathering the switch power module
Pressure；
The current sample module is connected with the LED load, is exported for gathering the switch power module to LED load
Output current；
The control module is connected with the voltage sample module, current sample module and voltage-regulation feedback module, for root
Adjusted according to the output voltage from the voltage sample module and the output current from the current sample module export to
The reference voltage of the voltage-regulation feedback module；
The voltage-regulation feedback module is connected with the switch power module, for according to the reference from the control module
Voltage produces corresponding voltage adjustment signal and the voltage adjustment signal is fed back into the switch power module so that described open
Powered-down source module adjusts output voltage；
The switch module includes at least one switching device, and each switching device correspondence is series in LED load all the way
And it is controlled by the control module, the control module to switching device output pwm control signal by realizing to institute
LED load is stated to be dimmed；
Wherein, output voltage of the basis from the voltage sample module and the output electricity from the current sample module
Stream adjusts reference voltage of the output to the voltage-regulation feedback module, including：
S1：A default reference voltage is exported to the voltage-regulation feedback module and measures the switch power module simultaneously
Output voltage and output current；
S2：Judge whether the output voltage exceedes predetermined maximum voltage value, if then closing the defeated of the switch power module
Go out, otherwise go to S3；
S3:Judge whether the output current is equal to pre-set current value, if then keeping defeated to the voltage-regulation feedback module
The reference voltage gone out is constant, otherwise goes to S4；
S4：Increase the reference voltage exported to the voltage-regulation feedback module, and go to S2.
6. LED constant current light adjusting circuit as claimed in claim 5, it is characterised in that：The current sample module includes at least one
Current-limiting resistance, each current-limiting resistance is series in LED load all the way；The voltage sample module is parallel with one another including two
Partial pressure branch road, each partial pressure branch route two divider resistances and is in series.
7. LED constant current light adjusting circuit as claimed in claim 6, it is characterised in that：The control module is provided with a voltage sample
Input, a D/A output ends, at least a current sample input and an at least PWM output ends；Wherein, the voltage sample is defeated
Enter end to be connected between two divider resistances of a partial pressure branch road in the voltage sample module, the D/A output ends connection
In the input of the voltage-regulation feedback module, each current sample input is connected to current limliting in LED load all the way
One end of resistance, each PWM output ends are connected to the control end of switching device in LED load all the way.
8. LED constant current light adjusting circuit as claimed in claim 7, it is characterised in that：The voltage-regulation feedback module includes electricity
Error amplifier and photoelectrical coupler are pressed, wherein,
The voltage error amplifier includes operational amplifier and compensation network, wherein, the compensation network is parallel to the fortune
Between the inverting input and output end of calculating amplifier, the inverting input is connected to another in the voltage sample module
Between two divider resistances of partial pressure branch road, the in-phase input end of the operational amplifier is connected to the D/A of the control module
Output end；
The anode of the photoelectrical coupler connects supply voltage by a first resistor, and its negative electrode is connected to the voltage error and put
The output end of big device, the colelctor electrode and emitter stage of the photoelectrical coupler are all connected to the switch power module.
9. the LED constant current light adjusting circuit as described in claim any one of 5-8, it is characterised in that：The switching device is MOS
Pipe.
10. a kind of control method of the LED constant current light adjusting circuit based on described in claim any one of 5-8, it is characterised in that bag
Include following steps：
S1：A default reference voltage is exported to voltage-regulation feedback module and measures the output voltage of switch power module simultaneously
And output current；
S2：Judge whether the output voltage exceedes predetermined maximum voltage value, if the then output of closing switch power module, no
Then carry out next step S3；
S3：Judge the output current whether be equal to pre-set current value, if then carry out next step S4, otherwise increase export to
The reference voltage and return to step S2 of voltage-regulation feedback module；
S4：Detect whether to receive from outside dimming control signal, if it is laggard then to export corresponding pwm control signal
Enter next step S5, otherwise directly carry out next step S5；
S5：Judge whether output current is equal to pre-set current value, if then return to step S4, otherwise carry out next step S6；
S6：Adjust the reference voltage；
S7：Judge whether the output voltage exceedes predetermined maximum voltage value, if the then output of closing switch power module, no
Then return to step S5.
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| CN201510697565.4A CN105188232B (en) | 2015-10-23 | 2015-10-23 | Constant current driver circuit for LED, light adjusting circuit and its control method |
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|---|---|---|---|
| CN201510697565.4A CN105188232B (en) | 2015-10-23 | 2015-10-23 | Constant current driver circuit for LED, light adjusting circuit and its control method |
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| CN105188232B true CN105188232B (en) | 2017-10-24 |
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Families Citing this family (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101980724B1 (en) * | 2010-08-05 | 2019-05-21 | 온세미컨덕터코리아 주식회사 | Led emitting device and driving method thereof |
| CN102858049B (en) * | 2011-06-30 | 2015-02-18 | 海洋王照明科技股份有限公司 | Over-current protection sampling circuit, light-emitting diode (LED) drive circuit and LED lamp |
| CN102883499A (en) * | 2011-08-02 | 2013-01-16 | 深圳桑达国际电子器件有限公司 | LED (light-emitting diode) silicon-controlled power supply and constant current control circuit |
| CN103096586A (en) * | 2012-12-29 | 2013-05-08 | 广东卓耐普智能技术股份有限公司 | Light-dimmer driving circuit |
| CN203072219U (en) * | 2013-01-04 | 2013-07-17 | 电子科技大学中山学院 | LED driving power supply |
| CN104080231A (en) * | 2013-03-29 | 2014-10-01 | 国钰电子(北海)有限公司 | LED drive system |
| CN203984724U (en) * | 2014-05-30 | 2014-12-03 | 威雅利电子（深圳）有限公司 | LED constant-current drive circuit, Switching Power Supply and lighting apparatus |
| CN204291449U (en) * | 2014-11-12 | 2015-04-22 | 浙江凯耀照明股份有限公司 | A kind of LED light modulation color-temperature regulating toning colour TV road |
| CN204291461U (en) * | 2014-11-25 | 2015-04-22 | 深圳市润杰明成照明科技有限公司 | A kind of drive circuit without stroboscopic LED lamp and drive unit |
| CN104507233A (en) * | 2014-12-27 | 2015-04-08 | 欧普照明股份有限公司 | LED driving control circuit |
| CN204497985U (en) * | 2015-04-13 | 2015-07-22 | 杭州士兰微电子股份有限公司 | LED drive circuit and switch power controller thereof |
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Denomination of invention: LED (light-emitting diode) constant-current drive circuit, constant-current dimming circuit and control method of LED (light-emitting diode) constant-current dimming circuit Effective date of registration: 20191015 Granted publication date: 20171024 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shenzhen branch Pledgor: Shenzhen Chipmap Electronic Technology Inc. Registration number: Y2019440020009 |
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