CN109640448A - A kind of constant current feedback control circuit - Google Patents
A kind of constant current feedback control circuit Download PDFInfo
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- CN109640448A CN109640448A CN201811593582.3A CN201811593582A CN109640448A CN 109640448 A CN109640448 A CN 109640448A CN 201811593582 A CN201811593582 A CN 201811593582A CN 109640448 A CN109640448 A CN 109640448A
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- 239000003990 capacitor Substances 0.000 claims description 33
- 239000004065 semiconductor Substances 0.000 claims description 30
- 239000003381 stabilizer Substances 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 238000005868 electrolysis reaction Methods 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 2
- 241000227425 Pieris rapae crucivora Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The invention discloses a kind of constant current feedback control circuits of the present invention, including constant-current control module, closed-loop feedback circuit and control module of transferring the files, first output end of the constant-current control module and the input terminal of closed-loop feedback circuit connect, the output end of the closed-loop feedback circuit is connect with the first input end for control module of transferring the files, and the second output terminal of the constant-current control module is connect with the second input terminal of control module of transferring the files.A kind of constant current feedback control circuit of the present invention carries out the feedback of pwm signal by constant-current control module and closed-loop feedback circuit, realizes dynamic current constant control, and can effectively reduce noise, realizes constant current output.It the composite can be widely applied in electronic circuit field.
Description
Technical field
The present invention relates to electronic circuit technology field more particularly to a kind of constant current feedback control circuits.
Background technique
LED is referred to as forth generation lighting source or green light source, has the characteristics that energy-saving and environmental protection, service life are long, small in size,
It can be widely applied to the fields such as various instructions, display, decoration, backlight, general lighting and urban landscape.Since LED is special
Property sensitive semiconductor devices, and there is negative temperature characteristic, thus need to carry out steady-working state to it in application process
And protection, to produce the concept of driving.Requirement of the LED component to driving power is near harshness, and LED is unlike common white
Vehement light bulb can be directly connected to the electric main of 220V.Since the light characteristic of LED is usually all described as the function of electric current, without
It is the function of voltage, therefore the relation curve of luminous flux (φ V) and IF can preferably control brightness using constant-current source driving.
The constant current of current LED on the market drives the driving IC of big voluminous profession, and which increase driving costs.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of constant current feedback control circuit
The technical solution used in the present invention is:
A kind of constant current feedback control circuit, including constant-current control module, closed-loop feedback circuit and control module of transferring the files, it is described
The input terminal of first output end of constant-current control module and closed-loop feedback circuit connects, the output end of the closed-loop feedback circuit with
The first input end of control module of transferring the files connects, and the second output terminal of the constant-current control module and transfers the files the second of control module
Input terminal connection.
As a further improvement of the present invention, the constant-current control module includes first resistor, second resistance, the first MOS
Pipe and constant current logic unit, the first output end of the constant current logic unit are connect with the grid of the first metal-oxide-semiconductor, and described first
The drain electrode of metal-oxide-semiconductor is connect by first resistor with the source electrode of the first metal-oxide-semiconductor, and the source electrode of first metal-oxide-semiconductor is patrolled with constant current
The second output terminal connection of unit is collected, the source electrode of first metal-oxide-semiconductor is connected to ground by second resistance, and the constant current is patrolled
The third output end for collecting unit is connect with the second input terminal of control module of transferring the files, and the drain electrode of first metal-oxide-semiconductor and closed loop are anti-
The input terminal of current feed circuit connects.
As a further improvement of the present invention, the closed-loop feedback circuit includes 3rd resistor, the 4th resistance, the 5th electricity
Resistance, the 6th resistance, the 7th resistance, the 8th resistance, first capacitor, the second capacitor, first comparator, the first transistor and the one or two
First output end of pole pipe, the constant-current control module is connected by the non-inverting input terminal of 3rd resistor and first comparator
It connects, the non-inverting input terminal of the first comparator is connected to ground by first capacitor, and the reverse phase of the first comparator is defeated
Enter end to connect by the 4th resistance with power end, the inverting input terminal of the first comparator is connected by the second capacitor and ground
It connects, the inverting input terminal of the first comparator is connected to ground by the 5th resistance, and the reverse phase of the first comparator is defeated
Enter end to connect by the 6th resistance with the positive terminal of first diode, the negative pole end of the first diode and control of transferring the files
The first input end of module connects, and the output end of first comparator is connect by the 8th resistance with power end, and described first compares
The output end of device is connect by the 7th resistance with the base stage of the first transistor, and the emitter and ground of the first transistor are even
It connects.
As a further improvement of the present invention, the control module of transferring the files includes the 9th resistance, the tenth resistance, third electricity
Appearance, the 4th capacitor, the second diode, second transistor, the first voltage-stabiliser tube and bistable logic unit, the closed-loop feedback circuit
Output end connect with the first input end of bistable logic unit, the second output terminal and bistable state of the constant-current control module
Second input terminal of logic unit connects, the current collection that the bistable logic unit passes through third capacitor and second transistor
The collector of pole connection, the second transistor is connect by the 9th resistance with power end, the emitter of the second transistor
It is connected to ground, the base stage of the second transistor is connect by the tenth resistance with the anode of the first voltage-stabiliser tube, first pressure stabilizing
The cathode of pipe is connect by the 4th capacitor with the anode of the first voltage-stabiliser tube, the anode of first voltage-stabiliser tube and the two or two pole
The negative pole end of pipe connects, and the positive terminal of second diode is connected to ground.
As a further improvement of the present invention, first metal-oxide-semiconductor is depletion type NMOS tube.
As a further improvement of the present invention, the first transistor is NPN transistor.
As a further improvement of the present invention, the second transistor is NPN transistor.
As a further improvement of the present invention, the 4th capacitor is electrolytic capacitor.
The beneficial effects of the present invention are:
A kind of constant current feedback control circuit of the present invention carries out pwm signal by constant-current control module and closed-loop feedback circuit
Feedback realizes dynamic current constant control, and can effectively reduce noise, realizes constant current output.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of constant current feedback control circuit of the present invention.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
With reference to Fig. 1, a kind of constant current feedback control circuit of the present invention, including constant-current control module, closed-loop feedback circuit and tune
Shelves control module, the first output end of the constant-current control module and the input terminal of closed-loop feedback circuit connect, and the closed loop is anti-
The output end of current feed circuit is connect with the first input end for control module of transferring the files, the second output terminal and tune of the constant-current control module
The second input terminal connection of shelves control module.
It is further used as preferred embodiment, the constant-current control module includes first resistor R1, second resistance R2,
One metal-oxide-semiconductor T1 and constant current logic unit, the first output end of the constant current logic unit are connect with the grid of the first metal-oxide-semiconductor T1,
The drain electrode of the first metal-oxide-semiconductor T1 is connect by first resistor R1 with the source electrode of the first metal-oxide-semiconductor T1, first metal-oxide-semiconductor
The source electrode of T1 is connect with the second output terminal of constant current logic unit, the source electrode of the first metal-oxide-semiconductor T1 by second resistance R2 into
And be connected to ground, the third output end of the constant current logic unit is connect with the second input terminal of control module of transferring the files, and described
The drain electrode of one metal-oxide-semiconductor T1 and the input terminal of closed-loop feedback circuit connect.
It is further used as preferred embodiment, the closed-loop feedback circuit includes 3rd resistor R3, the 4th resistance R4,
Five resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, first capacitor C1, the second capacitor C2, first comparator U1,
The first output end of the first transistor Q1 and first diode D1, the constant-current control module pass through 3rd resistor R3 and
The non-inverting input terminal of one comparator U1 connects, and the non-inverting input terminal of the first comparator U1 passes through first capacitor C1 and ground
The inverting input terminal of connection, the first comparator U1 is connect by the 4th resistance R4 with power end, the first comparator U1
Inverting input terminal be connected to ground by the second capacitor C2, the inverting input terminal of the first comparator U1 passes through the 5th electricity
Resistance R5 is connected to ground in turn, and the inverting input terminal of the first comparator U1 passes through the 6th resistance R6 and first diode D1
Positive terminal connection, the negative pole end of the first diode D1 connect with the first input end for control module of transferring the files, and first compares
The output end of device U1 is connect by the 8th resistance R8 with power end, and the output end of the first comparator U1 passes through the 7th resistance R7
And then connect with the base stage of the first transistor Q1, the emitter of the first transistor Q1 is connected to ground.
Be further used as preferred embodiment, the control module of transferring the files include the 9th resistance R9, the tenth resistance R10,
Third capacitor C3, the 4th capacitor C4, the second diode D2, second transistor Q2, the first voltage-stabiliser tube DZ1 and bistable logic list
The output end of member, the closed-loop feedback circuit is connect with the first input end of bistable logic unit, the constant-current control module
Second output terminal connect with the second input terminal of bistable logic unit, the bistable logic unit pass through third capacitor C3
And then connect with the collector of second transistor Q2, the collector of the second transistor Q2 passes through the 9th resistance R9 and power end
Connection, the emitter of the second transistor Q2 is connected to ground, the base stage of the second transistor Q2 by the tenth resistance R10 with
The anode of first voltage-stabiliser tube DZ1 connects, and the cathode of the first voltage-stabiliser tube DZ1 passes through the 4th capacitor C4 and the first voltage-stabiliser tube
The anode of DZ1 connects, and the anode of the first voltage-stabiliser tube DZ1 is connect with the negative pole end of the second diode D2, the two or two pole
The positive terminal of pipe D2 is connected to ground.
Constant current feedback control circuit is applied in LED lamp tube in the present embodiment, and the first metal-oxide-semiconductor T1 is depletion type NMOS
Pipe, the second transistor Q2 are NPN transistor, and the 4th capacitor C4 is electrolytic capacitor, are controlled by constant current logic unit
The Push And Release of the first metal-oxide-semiconductor T1 is made, and guarantees that electric current will not be turned off completely by first resistor R1, because of constant current logic unit
It is automatic open-close the first metal-oxide-semiconductor T1 according to a reference value of current feedback information comparison setting, has certain self-oscillatory
Characteristic, the first metal-oxide-semiconductor T1 can be considered the adjustable resistance of an automatic adjustment here, because of I=U/R, when U has certain ripple
Wait, it is ensured that the value of I is constant, and most effective method is exactly that the value of R is allowed to change with the variation of V --- become automatic adjustment
Adjustable resistance, quotient both in this way, just has an opportunity to be constant, that is, LED light constant current light.
The closed-loop feedback circuit tracks the voltage value at the first both ends metal-oxide-semiconductor T1 by first comparator U1, due to first
Metal-oxide-semiconductor T1 can be considered as continuously adjustable " resistance ", and the voltage signal at this " resistance " both ends, what is just reflected is the tenth electricity
Ripple signal in appearance, it is necessary to assure the voltage on LED cannot exceed safe range can not be too low, i.e., in a reasonable model
In enclosing.After obtaining the information of voltage on LED, it and a reference value are made comparisons, by control the folding of the first transistor Q1 come
The on-off of the second capacitor C2 is determined, so that the size of duty ratio is on control switch energy supply control module to form control system
Closed loop that is, when the too high duty ratio being reduced by Switching Power Supply control module of discovery capacitance voltage, otherwise increases.Here closed loop
Feed circuit is mainly used for intercept signal at the first metal-oxide-semiconductor T1, because the signal at this is simple and noise is less, it should be noted that
It is that the pressure voltage of the first transistor Q1 should be greater than 400V.
The control module of transferring the files realizes that two grades are turned, and mcu programming can also be used using bistable logic unit
Method realize.It all must be the voltage from the tenth capacitor that key, which is signal source and power supply, the voltage of the tenth capacitor or
Higher than 38V (by taking 7 and 15 string LED arrays as an example) or it is lower than, that is to say, that reach this voltage LED can just lead to.Due to lamp
The movement of pipe gear shift is implemented by switch on and off power supply, in the present embodiment, measures its voltage at the both ends of the tenth capacitor,
It can climb sharply rapidly when being powered to 38V, then slowly rise to 45V；When turning off the light, voltage is dropped into rapidly by 45V and is less than
Then 38V slowly falls.The second voltage-stabiliser tube of 39V is selected to come collecting signal source in the present embodiment.When power is off, the electricity of LED
It is pressed in and just drops later very slow as low as 38V, the charge of redundancy was just absorbed clean up to 5 seconds or more.Constant current is fed back as a result,
The supply power supply of module is derived from the tenth capacitor, and there are also the power supplys of long period to maintain after turning off the light, the holding for gear-shifting information
Just have biggish advantage, even it is some action relative delay people's bodyguard when function is transferred the files in use, in the process of on-off switch
In be just unlikely to not catching up with rhythm.
It is to be illustrated to preferable implementation of the invention, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations on the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all included in the scope defined by the claims of the present application.
Claims (8)
1. a kind of constant current feedback control circuit, it is characterised in that: including constant-current control module, closed-loop feedback circuit and control of transferring the files
Module, the first output end of the constant-current control module and the input terminal of closed-loop feedback circuit connect, the closed-loop feedback circuit
Output end connect with the first input end for control module of transferring the files, the second output terminal of the constant-current control module and transfer the files control
Second input terminal of module connects.
2. a kind of constant current feedback control circuit according to claim 1, it is characterised in that: the constant-current control module includes
First resistor, second resistance, the first metal-oxide-semiconductor and constant current logic unit, the first output end and first of the constant current logic unit
The grid of metal-oxide-semiconductor connects, and the drain electrode of first metal-oxide-semiconductor is connect by first resistor with the source electrode of the first metal-oxide-semiconductor, described
The source electrode of first metal-oxide-semiconductor is connect with the second output terminal of constant current logic unit, and the source electrode of first metal-oxide-semiconductor passes through second resistance
And then be connected to ground, the third output end of the constant current logic unit is connect with the second input terminal of control module of transferring the files, described
The drain electrode of first metal-oxide-semiconductor and the input terminal of closed-loop feedback circuit connect.
3. a kind of constant current feedback control circuit according to claim 1, it is characterised in that: the closed-loop feedback circuit includes
3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, first capacitor, the second capacitor, first
Comparator, the first transistor and first diode, the first output end of the constant-current control module by 3rd resistor with
The non-inverting input terminal of first comparator connects, and the non-inverting input terminal of the first comparator is connected by first capacitor and ground
It connects, the inverting input terminal of the first comparator is connect by the 4th resistance with power end, and the reverse phase of the first comparator is defeated
Enter end to be connected to ground by the second capacitor, the inverting input terminal of the first comparator is connected by the 5th resistance and ground
It connecing, the inverting input terminal of the first comparator is connect by the 6th resistance with the positive terminal of first diode, and described
The negative pole end of one diode is connect with the first input end for control module of transferring the files, and the output end of first comparator passes through the 8th resistance
It is connect with power end, the output end of the first comparator is connect by the 7th resistance with the base stage of the first transistor, institute
The emitter for stating the first transistor is connected to ground.
4. a kind of constant current feedback control circuit according to claim 1, it is characterised in that: the control module of transferring the files includes
9th resistance, the tenth resistance, third capacitor, the 4th capacitor, the second diode, second transistor, the first voltage-stabiliser tube and bistable state
The output end of logic unit, the closed-loop feedback circuit is connect with the first input end of bistable logic unit, the constant current control
The second output terminal of molding block is connect with the second input terminal of bistable logic unit, and the bistable logic unit passes through third
Capacitor is connect with the collector of second transistor in turn, and the collector of the second transistor is connected by the 9th resistance and power end
It connects, the emitter of the second transistor is connected to ground, and the base stage of the second transistor passes through the tenth resistance and the first pressure stabilizing
The anode of pipe connects, and the cathode of first voltage-stabiliser tube is connect by the 4th capacitor with the anode of the first voltage-stabiliser tube, described
The anode of first voltage-stabiliser tube is connect with the negative pole end of the second diode, and the positive terminal of second diode is connected to ground.
5. a kind of constant current feedback control circuit according to claim 2, it is characterised in that: first metal-oxide-semiconductor is to exhaust
Type NMOS tube.
6. a kind of constant current feedback control circuit according to claim 3, it is characterised in that: the first transistor is NPN
Transistor.
7. a kind of constant current feedback control circuit according to claim 4, it is characterised in that: the second transistor is NPN
Transistor.
8. a kind of constant current feedback control circuit according to claim 4, it is characterised in that: the 4th capacitor is electrolysis electricity
Hold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811593582.3A CN109640448B (en) | 2018-12-25 | 2018-12-25 | Constant current feedback control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811593582.3A CN109640448B (en) | 2018-12-25 | 2018-12-25 | Constant current feedback control circuit |
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| CN109640448A true CN109640448A (en) | 2019-04-16 |
| CN109640448B CN109640448B (en) | 2024-02-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462835A (en) * | 2020-11-04 | 2021-03-09 | 昂维格(厦门)科技有限公司 | Low-voltage linear voltage stabilizer |
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| CN109640448B (en) | 2024-02-13 |
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