CN109041353A - A kind of electric current loop feedback compensation control circuit of variable gain - Google Patents
A kind of electric current loop feedback compensation control circuit of variable gain Download PDFInfo
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- CN109041353A CN109041353A CN201811067952.XA CN201811067952A CN109041353A CN 109041353 A CN109041353 A CN 109041353A CN 201811067952 A CN201811067952 A CN 201811067952A CN 109041353 A CN109041353 A CN 109041353A
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- 239000004065 semiconductor Substances 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 38
- 238000005070 sampling Methods 0.000 claims description 28
- 230000005611 electricity Effects 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims 1
- 208000031361 Hiccup Diseases 0.000 description 14
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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Abstract
The invention discloses a kind of electric current loop feedback compensation control circuits of variable gain, the control circuit is used for Dimmable LED constant-current supply, the control circuit includes operational amplifier, feedback network, benchmark Vref unit, dim signal ADJ, sample rate current unit, variable gain control unit, isolated location and pulse width modulation controlled unit, the output end of the operational amplifier is connect by isolated location with the pulse width modulation controlled unit, the input terminal of the benchmark Vref unit is connect with dim signal ADJ, the output end of the benchmark Vref unit is connected with the non-inverting input terminal of the operational amplifier, non-inverting input terminal voltage of the reference voltage that the benchmark Vref unit generates as the operational amplifier, the feedback network is connected to the output end and anti-phase input of the operational amplifier Between end, the inverting input terminal of the operational amplifier is separately connected the sample rate current unit and variable gain control unit, which also connect with dim signal ADJ.
Description
Technical field
The present invention relates to a kind of electric current loop of LED tunable optical constant-current supply technical field more particularly to variable gain feedbacks
Compensation control circuit.
Background technique
In the application of Dimmable LED constant-current supply, LED power would generally have (0~10V/PWM signal) brightness adjustment control function
It can be with constant current output function.
Dimming control function: LED power design draws light modulation line with control chip, in output end, and light modulation line connects 0~
When 10V is dimmed, by 0~10V voltage or change in duty cycle, changes electric power outputting current, dimmed.Such as: when 0-10V tune
When light device is modulated to 1V, electric current falls below 10%, and when 0-10V light modulator is transferred to maximum 10V, output electric current is also up to power supply
The 100% of output, brightness is also up to 100% (output voltage is constant).Similarly, pwm signal light modulation is become by duty ratio
Change and adjusts output electric current.
Constant current output function: use special constant-current circuit, constant current output, will not with output voltage change and substantially
Degree variation.
Existing Dimmable LED constant-current supply includes electric current loop feedback compensation control circuit, the electric current loop feedback compensation
The circuit structure of control circuit is as shown in Figure 1.LED constant current power supply changes output electric current to LED light by changing dimmer voltage
It is dimmed, enters hiccup mode when dimmer voltage is reduced to power supply when certain, output gently loads.This is because at light load
Current loop gain becomes larger, PWM controller chip control PWM operating switch frequency increase, reach maximum operation frequency limit value and
It enters hiccup mode, therefore dims power supply at light load and enter hiccup mode and not can avoid.Hiccup is had just enter into LED drive power
Hiccup frequency when mode it is low (hiccup frequency be with dimmer voltage reduction, output loading reduces increases current loop gain
Increase greatly), the synchronous hiccup frequency of output current ripple, since gain is slowly varying, so having just enter into hiccup Working mould
Hiccup frequency when formula is very low, and resulting low-frequency ripple noise causes to export electric current shake and flash LED.
Summary of the invention
Technical problem to be solved by the present invention lies in providing a kind of electric current loop feedback compensation control circuit of variable gain,
The control circuit can change current loop gain according to dim signal size, solve because power supply enters hiccup at light load for light modulation output
Mode and the problem of cause LED to flash.
In order to solve the above technical problems, the present invention uses technical solution as described below:
A kind of electric current loop feedback compensation control circuit of variable gain, the control circuit are used for Dimmable LED constant-current supply,
The control circuit include operational amplifier, feedback network, benchmark Vref unit, dim signal ADJ, sample rate current unit, can
Gain-scheduling control unit, isolated location and pulse width modulation controlled unit, the output end of the operational amplifier pass through isolated location
It is connect with the pulse width modulation controlled unit, the input terminal of the benchmark Vref unit is connect with dim signal ADJ, the benchmark
The output end of Vref unit is connected with the non-inverting input terminal of the operational amplifier, the benchmark electricity that the benchmark Vref unit generates
The non-inverting input terminal voltage as the operational amplifier is pressed, the feedback network is connected to the output end of the operational amplifier
Between inverting input terminal, the inverting input terminal of the operational amplifier is separately connected the sample rate current unit and variable gain
Control unit, the variable gain control unit are also connect with dim signal ADJ.
Preferably, the sample rate current unit includes sampling resistor R203, and sampling resistor R203 mono- terminates sampling site, separately
One end is connected with the inverting input terminal of the operational amplifier.
Preferably, the variable gain control unit include resistance R206, resistance R207, resistance R208, resistance R209,
Resistance R210, capacitor C206, capacitor C207, metal-oxide-semiconductor Q201 and metal-oxide-semiconductor Q202, the grid of the metal-oxide-semiconductor Q202 pass through resistance
R210 is connect with dim signal ADJ signal, and the resistance R209 and capacitor C207 are parallel to the grid of the metal-oxide-semiconductor Q202 and adopt
Between sample ground, the source electrode of the metal-oxide-semiconductor Q202 connects sampling site, and the drain electrode of the metal-oxide-semiconductor Q202 passes through resistance R208 and power supply
SVCC connection, the node between the drain electrode and resistance R208 of the metal-oxide-semiconductor Q202 pass through the resistance R207's and metal-oxide-semiconductor Q201
The grid of grid connection, metal-oxide-semiconductor Q201 connect with source electrode and connects sampling site by capacitor C206, the drain electrode of metal-oxide-semiconductor Q201
It is connect by resistance R206 with the inverting input terminal of the operational amplifier.
Preferably, the benchmark Vref unit includes resistance R204, resistance R205, adjustable resistance VR201, capacitor C204
With capacitor C205, the one end the adjustable resistance VR201 is connect with dim signal ADJ signal, the other end pass sequentially through resistance R205,
The non-inverting input terminal of resistance R204 ground connection, node and the operational amplifier between the resistance R205 and resistance R204 connects
It connects, the capacitor C204, capacitor C205 are parallel to the both ends the resistance R204.
Preferably, the isolated location includes optocoupler U201, rectifier diode D201 and current-limiting resistance R201, the optocoupler
The anode of luminous tube in U201 is connect with power supply SVCC, the cathode of the luminous tube in the optocoupler U201 and two poles of the rectification
The anode connection of pipe D201, the cathode of the rectifier diode D201 pass through current-limiting resistance R201 and the operational amplifier
Output end is connected, and the photosensitive tube in the optocoupler U201 is connect with the pulse width modulation controlled unit.
Preferably, the feedback network includes capacitor C201, capacitor C202 and resistance R202, and the capacitor C201 is connected to
Between the output end and inverting input terminal of the operational amplifier, the capacitor C202 and resistance R202 are connected in series in the fortune
Between the output end and inverting input terminal for calculating amplifier.
Preferably, the pulse width modulation controlled unit is made of a PWM controller chip IC101.
The beneficial technical effect of the present invention lies in: the electric current loop feedback compensation control circuit of above-mentioned variable gain, sampling electricity
Stream unit detection load current situation obtains sampled current signals, and the reverse phase which is input to operational amplifier is defeated
Enter end compared with reference voltage, operational amplifier, which amplifies comparison error signal, to be exported, and feedback control for networked control operational amplifier is defeated
Signal stabilization out makes pulse width modulation controlled unit adjust pwm signal working frequency, to realize constant current by isolated location
Output function；When dim signal ADJ is reduced to a timing, variable gain control unit conducting is in parallel with sample rate current unit, drop
Low impedance of the operational amplifier inverting input terminal to sampling site, the electric current for flowing through feedback network increase, feedback network gain
Become larger to change the output signal of operational amplifier, the output signal of operational amplifier is input to pulsewidth tune by isolated location
Control unit processed, pulse width modulation controlled unit increases pwm signal working frequency according to output signal adjusting, to make pulsewidth
Modulation control unit hiccup frequency increases, and avoiding makes asking for LED flashing because low-frequency ripple noise causes to export due to electric current is shaken
Topic.
Detailed description of the invention
Fig. 1 is that the structure in the prior art for the electric current loop feedback compensation control circuit of Dimmable LED constant-current supply is shown
It is intended to；
Fig. 2 is the electric current loop feedback compensation control circuit in the present invention for the variable gain of Dimmable LED constant-current supply
Structural schematic diagram；
Fig. 3 is the electric current loop feedback compensation control circuit in the present invention for the variable gain of Dimmable LED constant-current supply
Circuit diagram.
Specific embodiment
To make those skilled in the art that the object, technical solutions and advantages of the present invention be more clearly understood, with
Under the present invention is further elaborated in conjunction with the accompanying drawings and embodiments.
As shown in Fig. 2, in an embodiment of the invention, the electric current of the variable gain for Dimmable LED constant-current supply
Ring feedback compensation control circuit includes operational amplifier, feedback network 40, benchmark Vref unit 10, dim signal ADJ, sampling
Current unit 20, variable gain control unit 30, isolated location 50 and pulse width modulation controlled unit 60.The benchmark Vref unit
10 input terminal is connect with dim signal ADJ, the same phase of the output end and the operational amplifier of the benchmark Vref unit 10
Input terminal is connected, non-inverting input terminal voltage of the reference voltage that benchmark Vref unit 10 generates as the operational amplifier.
The feedback network 40 is connected between the output end and inverting input terminal of the operational amplifier, the operational amplifier it is anti-
Phase input terminal connects the sample rate current unit 20, and the sample rate current unit 20 detection output load current situation obtains sampling electricity
Signal is flowed, which is input to the inverting input terminal of operational amplifier compared with reference voltage, operational amplifier pair
Comparison error signal amplification output, feedback control for networked control opamp-output signal are stablized, the output signal of operational amplifier
It is input to pulse width modulation controlled unit 60 by isolated location 50, pulse width modulation controlled unit 60 is adjusted according to the output signal
Pwm signal working frequency, to realize constant current output function.The output end of the operational amplifier passes through isolated location 50
Photosensor signal is exported to the pulse width modulation controlled unit 60, which is adjusted according to the photosensor signal
Pwm signal working frequency realizes dimming function to adjust the load current size in LED load.The Distinct matrix
The input terminal of unit 30 is connect with dim signal ADJ, and output end is connected to the inverting input terminal of the operational amplifier, works as light modulation
Signal ADJ is reduced to centainly, and conducting is in parallel with sample rate current unit 20 inside variable gain control unit 30, is reduced operation and is put
Big impedance of the device inverting input terminal to sampling site, the electric current for flowing through feedback network 40 increase, 40 gain of feedback network become larger from
And changing the output signal of operational amplifier, the output signal of operational amplifier is input to pulsewidth modulation control by isolated location 50
Unit 60 processed, pulse width modulation controlled unit 60 increases pwm signal working frequency according to output signal adjusting, to make pulsewidth
Modulation control unit 60 adjusts PWM hiccup frequency and increases, and avoids because low-frequency ripple noise causes to make LED due to exporting electric current shake
The problem of flashing.
Fig. 3 shows the circuit diagram of the electric current loop feedback compensation control circuit of variable gain of the invention.Such as Fig. 3 institute
Show, the benchmark Vref unit 10 includes resistance R204, resistance R205, adjustable resistance VR201, capacitor C204 and capacitor
C205, the one end the adjustable resistance VR201 are connect with dim signal ADJ signal, and the other end passes sequentially through resistance R205, resistance
R204 ground connection, the node between the resistance R205 and resistance R204 are connect with the non-inverting input terminal of the operational amplifier, institute
It is in parallel with the resistance R204 respectively to state capacitor C204, capacitor C205.The dim signal ADJ passes through adjustable resistance VR201, electricity
The non-inverting input terminal that resistance R205 and R204 is divided to operational amplifier IC201B generates a benchmark Vref signal.
The feedback network 40 includes that capacitor C201, capacitor C202 and resistance R202, the capacitor C201 are connected to described
Between the output end and inverting input terminal of operational amplifier, the capacitor C202 and resistance R202 are connected in series in the operation and put
Between the output end and inverting input terminal of big device.The sample rate current unit 20 includes sampling resistor R203 and capacitor C203, should
Sampling resistor R203 mono- terminates sampling site, and the other end is connected with the inverting input terminal of the operational amplifier；Capacitor C203 mono-
End ground connection, the other end are connected with the inverting input terminal of the operational amplifier.The sample rate current unit 20 is by sampling
The output load current signal sampling on ground, sampled signal are input to the inverting input terminal of operational amplifier by resistance R203.
The output end of the operational amplifier is exported by isolated location 50 to the pulse width modulation controlled unit 60 photosensitive
Signal, the pulse width modulation controlled unit 60 adjust pwm signal working frequency according to the photosensor signal to adjust in LED load
Load current, the pulse width modulation controlled unit 60 are preferably a PWM controller chip IC101.The isolated location 50 wraps
Include the anode and power supply of optocoupler U201, rectifier diode D201 and the luminous tube in current-limiting resistance R201, the optocoupler U201
SVCC connection, the cathode of the luminous tube in the optocoupler U201 are connect with the anode of the rectifier diode D201, the rectification
The cathode of diode D201 is connected by current-limiting resistance R201 with the output end of the operational amplifier, in the optocoupler U201
Photosensitive tube connect with the PWM controller chip IC101.
The variable gain control unit 30 includes resistance R206, resistance R207, resistance R208, resistance R209, resistance
R210, capacitor C206, capacitor C207, metal-oxide-semiconductor Q201 and metal-oxide-semiconductor Q202, the metal-oxide-semiconductor Q202 grid by resistance R210 with
The connection of dim signal ADJ signal, the resistance R209 and capacitor C207 be parallel to the metal-oxide-semiconductor Q202 grid and sampling site it
Between, the source electrode of the metal-oxide-semiconductor Q202 connects sampling site, and the drain electrode of the metal-oxide-semiconductor Q202 is connect by resistance R208 with power supply SVCC,
Node between the drain electrode and resistance R208 of the metal-oxide-semiconductor Q202 is connect by resistance R207 with the grid of the metal-oxide-semiconductor Q201,
The grid of metal-oxide-semiconductor Q201 connect with source electrode and connects sampling site by capacitor C206, and the drain electrode of metal-oxide-semiconductor Q201 passes through resistance
R206 is connect with the inverting input terminal of the operational amplifier.
The working principle of the electric current loop feedback compensation control circuit of variable gain provided by the invention is as follows:
State 1 (heavy duty): when 0-10V is transferred to 10V, dim signal ADJ passes through adjustable resistance VR201, resistance
The non-inverting input terminal that R205 and resistance R204 is divided to operational amplifier IC201B generates benchmark Vref signal, samples output loading
Current signal is input to the inverting input terminal of operational amplifier IC201B compared with benchmark Vref signal through resistance R203, and operation is put
Big device IC201B, which amplifies comparison error signal, to be exported, feedback control for networked control operational amplifier IC201B stable output signal, fortune
It calculates amplifier IC201B output end and passes through resistance R201, rectifier diode D201 and optocoupler U201 to PWM controller chip
IC101 export photosensor signal, PWM controller chip IC101 according to the photosensor signal adjust pwm signal working frequency to
The load current in LED load is adjusted, at this point, power supply output 100% electric current (heavy duty)；Dim signal ADJ passes through resistance simultaneously
R210, resistance R209 partial pressure are input to metal-oxide-semiconductor Q202 grid, and input voltage is greater than metal-oxide-semiconductor Q202 gate threshold cut-in voltage,
Metal-oxide-semiconductor Q202 conducting, power supply SVCC voltage flow to ground by resistance R208 and metal-oxide-semiconductor Q202, and the voltage at the both ends resistance R207 is
0, then metal-oxide-semiconductor Q201 grid voltage is 0 not open-minded, so that resistance R206 is not parallel to resistance R203, electric current loop feedback oscillator is constant.
State 2 (underloading): when dimmer voltage is reduced to certain value, dim signal ADJ passes through adjustable resistance VR201, electricity
The non-inverting input terminal that resistance R205 and resistance R204 is divided to operational amplifier IC201B generates benchmark Vref signal, and sampling output is negative
It carries current signal and is input to the inverting input terminal of operational amplifier IC201B compared with benchmark Vref signal through resistance R203, operation
Amplifier IC201B, which amplifies comparison error signal, to be exported, feedback control for networked control operational amplifier IC201B stable output signal,
Operational amplifier IC201B output end passes through resistance R201, rectifier diode D201 and optocoupler U201 to PWM controller chip
IC101 export photosensor signal, PWM controller chip IC101 according to the photosensor signal adjust pwm signal working frequency to
The load current in LED load is adjusted, at this point, the light load of power supply output；Dim signal ADJ passes through resistance R210, resistance simultaneously
R209 partial pressure is input to metal-oxide-semiconductor Q202 grid, and input voltage is lower than metal-oxide-semiconductor Q202 gate threshold cut-in voltage, and metal-oxide-semiconductor Q202 is not
Conducting, power supply SVCC are higher than threshold values cut-in voltage to the grid supply voltage of metal-oxide-semiconductor Q201 by resistance R208, resistance R207,
Metal-oxide-semiconductor Q201 conducting, keeps resistance R206 in parallel with resistance R203, the inverting input terminal of operational amplifier IC201B is to sampling site
Impedance becomes smaller, and the electric current for flowing through feedback network increases, and feedback oscillator becomes larger, the output end voltage drop of operational amplifier IC201B
It is low, photosensor signal is exported to PWM controller chip IC101 by resistance R201, rectifier diode D201 and optocoupler U201,
PWM controller chip IC101 increases PWM signal frequency according to photosensor signal adjusting, makes PWM controller chip
Frequency of having the hiccups when IC101 enters hiccup mode is high, from without low-frequency noise, avoid because low-frequency ripple noise cause it is defeated
The problem of electric current is shaken and flashes LED out.
The above description is only a preferred embodiment of the present invention, rather than does limitation in any form to the present invention.This field
Technical staff can impose various equivalent changes and improvement, all institutes within the scope of the claims on the basis of the above embodiments
The equivalent variations or modification done, should all fall under the scope of the present invention.
Claims (7)
1. a kind of electric current loop feedback compensation control circuit of variable gain, which is used for Dimmable LED constant-current supply,
Be characterized in that: the control circuit includes operational amplifier, feedback network, benchmark Vref unit, dim signal ADJ, sampling
The output end of current unit, variable gain control unit, isolated location and pulse width modulation controlled unit, the operational amplifier is logical
It crosses isolated location to connect with the pulse width modulation controlled unit, the input terminal and dim signal ADJ of the benchmark Vref unit connect
It connects, the output end of the benchmark Vref unit is connected with the non-inverting input terminal of the operational amplifier, the benchmark Vref unit
Non-inverting input terminal voltage of the reference voltage of generation as the operational amplifier, the feedback network are connected to the operation and put
Between the output end and inverting input terminal of big device, the inverting input terminal of the operational amplifier is separately connected the sample rate current list
Member and variable gain control unit, the variable gain control unit are also connect with dim signal ADJ.
2. the electric current loop feedback compensation control circuit of variable gain as described in claim 1, it is characterised in that: the sampling electricity
Stream unit includes sampling resistor R203, and sampling resistor R203 mono- terminates sampling site, and the other end is anti-with the operational amplifier
Phase input terminal is connected.
3. the electric current loop feedback compensation control circuit of variable gain as claimed in claim 2, it is characterised in that: the variable increasing
Beneficial control unit includes resistance R206, resistance R207, resistance R208, resistance R209, resistance R210, capacitor C206, capacitor
The grid of C207, metal-oxide-semiconductor Q201 and metal-oxide-semiconductor Q202, the metal-oxide-semiconductor Q202 are connected by resistance R210 and dim signal ADJ signal
It connects, the resistance R209 and capacitor C207 are parallel between the grid and sampling site of the metal-oxide-semiconductor Q202, the metal-oxide-semiconductor Q202
Source electrode connect sampling site, the drain electrode of the metal-oxide-semiconductor Q202 is connect by resistance R208 with power supply SVCC, the metal-oxide-semiconductor Q202's
Node between drain electrode and resistance R208 is connect by resistance R207 with the grid of the metal-oxide-semiconductor Q201, the grid of metal-oxide-semiconductor Q201
Pole connect with source electrode and connects sampling site by capacitor C206, and the drain electrode of metal-oxide-semiconductor Q201 is put by resistance R206 and the operation
The inverting input terminal connection of big device.
4. the electric current loop feedback compensation control circuit of variable gain as claimed in claim 3, it is characterised in that: the benchmark
Vref unit includes resistance R204, resistance R205, adjustable resistance VR201, capacitor C204 and capacitor C205, the adjustable resistance
The one end VR201 is connect with dim signal ADJ signal, and the other end passes sequentially through resistance R205, resistance R204 ground connection, the resistance
Node between R205 and resistance R204 is connect with the non-inverting input terminal of the operational amplifier, the capacitor C204, capacitor
C205 is parallel to the both ends the resistance R204.
5. the electric current loop feedback compensation control circuit of variable gain as claimed in claim 4, it is characterised in that: the isolation is single
Member includes the anode and electricity of optocoupler U201, rectifier diode D201 and the luminous tube in current-limiting resistance R201, the optocoupler U201
Source SVCC connection, the cathode of the luminous tube in the optocoupler U201 is connect with the anode of the rectifier diode D201, described whole
The cathode of stream diode D201 is connected by current-limiting resistance R201 with the output end of the operational amplifier, the optocoupler U201
In photosensitive tube connect with the pulse width modulation controlled unit.
6. the electric current loop feedback compensation control circuit of variable gain as claimed in claim 5, it is characterised in that: the feedback net
Network includes capacitor C201, capacitor C202 and resistance R202, the capacitor C201 be connected to the output end of the operational amplifier with
Between inverting input terminal, the capacitor C202 and resistance R202 be connected in series in the operational amplifier output end and reverse phase it is defeated
Enter between end.
7. the electric current loop feedback compensation control circuit of variable gain as claimed in claim 6, it is characterised in that: the pulsewidth tune
Control unit processed is made of a PWM controller chip IC101.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811067952.XA CN109041353B (en) | 2018-09-13 | 2018-09-13 | Variable-gain current loop feedback compensation control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811067952.XA CN109041353B (en) | 2018-09-13 | 2018-09-13 | Variable-gain current loop feedback compensation control circuit |
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| CN109041353A true CN109041353A (en) | 2018-12-18 |
| CN109041353B CN109041353B (en) | 2023-09-19 |
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| CN109041353B (en) | 2023-09-19 |
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