CN107943185A - average current constant-current control circuit - Google Patents
average current constant-current control circuit Download PDFInfo
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- CN107943185A CN107943185A CN201711452376.6A CN201711452376A CN107943185A CN 107943185 A CN107943185 A CN 107943185A CN 201711452376 A CN201711452376 A CN 201711452376A CN 107943185 A CN107943185 A CN 107943185A
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- 238000013519 translation Methods 0.000 claims abstract description 89
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000008859 change Effects 0.000 claims description 3
- 230000003321 amplification Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 description 11
- 230000008439 repair process Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Control Of Voltage And Current In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses average current constant-current control circuit, it includes：Voltage source, load circuit, the first VI translation circuits, IV translation circuits, the 2nd VI translation circuits, integrating circuit and reference generating circuit.Voltage source is used to provide input voltage；First VI translation circuits are used for the control voltage conversion by integrating circuit output into load current；IV translation circuits are used to load current being converted into sampled voltage；2nd VI translation circuits are used to sampled voltage being converted into feedback current；Integrating circuit is used to the reference current that feedback current and reference generating circuit produce producing control voltage；Reference generating circuit is used to produce reference current.A kind of average current constant-current control circuit of the present invention is a closed control circuit, its is simple in structure, and cost is low, and Each performs its own functions for each circuit module, and constant current accuracy is high, and current ripples are small, and noise robustness is superior.
Description
Technical field
The invention belongs to current constant control technical field, and in particular to a kind of average current constant-current control circuit.
Background technology
Average Current Control circuit is the common control program of constant-current supply, in energy-saving illuminating circuit, screen back light source, greatly
There is important application in the fields such as power illumination.Compared with peak current control circuitry and hysteresis current control circuit, average electricity
The circuit of flow control pattern has the advantages that control accuracy is high, and current ripples are small, and noise robustness is superior.But it is by control principle
Limitation often circuit structure is complicated, design difficulty is big, and response speed is slower.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention proposes a kind of average current constant current control simple in structure, inexpensive
Circuit processed, its constant current accuracy is high, and current ripples are small, and noise robustness is superior.
In order to achieve the above object, technical scheme is as follows：
Average current constant-current control circuit, including：
Voltage source, for providing input voltage；
Load circuit, is connected with voltage source；
Further include：
First VI translation circuits, the first VI translation circuits have first input end, the second input terminal and output terminal, the first VI
The first input end of translation circuit is connected with load circuit, and the output terminal connection of its second input terminal and integrating circuit, it is exported
End is connected with the input terminal of IV translation circuits, and the first VI translation circuits are used to turn the control voltage V_ct1 of integrating circuit output
Change load current I_load into；
IV translation circuits, the input terminal of IV translation circuits are connected with the output terminal of the first VI translation circuits, its output terminal with
The input terminal connection of 2nd VI translation circuits, IV translation circuits are used to load current I_load being converted into sampled voltage V_s；
2nd VI translation circuits, the input terminal of the 2nd VI translation circuits are connected with the output terminal of IV translation circuits, it is exported
End is connected with the second input terminal of integrating circuit, and the 2nd VI translation circuits are used to sampled voltage V_s being converted into feedback current I_
fb；
Integrating circuit, integrating circuit have first input end, the second input terminal and output terminal, the first input of integrating circuit
End is connected with reference generating circuit, its second input terminal is connected with the output terminal of the 2nd VI translation circuits, its output terminal and first
The second input terminal connection of VI translation circuits, integrating circuit are used for the benchmark for producing feedback current I_fb and reference generating circuit
Electric current I_ref produces control voltage V_ct1；
Reference generating circuit, for producing reference current I_ref.
A kind of average current constant-current control circuit of the present invention is a closed control circuit, its is simple in structure, and cost is low, each
Each performs its own functions for circuit module, and constant current accuracy is high, and current ripples are small, and noise robustness is superior.
Based on the above technical solutions, following improvement can also be done：
As preferable scheme, the first VI translation circuits include：NMOS tube, the drain electrode of NMOS tube are connected with load circuit,
The output terminal of its grid and integrating circuit connects, its source electrode is connected with IV translation circuits.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.
As preferable scheme, the first VI translation circuits include：NPN is managed, and the collector of NPN pipes is connected with load circuit,
The output terminal of its base stage and integrating circuit connects, its emitter is connected with IV translation circuits.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.
As preferable scheme, IV translation circuits include：One end of resistance R_sense, resistance R_sense are respectively with
The input terminal connection of the output terminal and the 2nd VI translation circuits of one VI translation circuits, its other end ground connection；
The input terminal of IV translation circuits and its output terminal are the same end.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.
As preferable scheme, the 2nd VI translation circuits are GM conversion circuits.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.
As preferable scheme, GM conversion circuits include：Amplifier, nmos pass transistor MN101 and resistance R1；Amplifier
Positive input is connected with sampled voltage V_s, and the reverse input end of amplifier is connected with resistance R1, the output terminal of amplifier with
The grid connection of MN101；Reverse input end of the source electrode of MN101 respectively with resistance R1 and amplifier is connected, its grid and amplification
The output terminal connection of device, and its drain electrode is connected with control voltage V_ct1.
Using the above preferred scheme, it is simple in structure.
As preferable scheme, integrating circuit includes：One end of capacitance C_int, capacitance C_int occur with benchmark respectively
The second input terminal connection of the output terminal of circuit, the output terminal of the 2nd VI translation circuits and the first VI translation circuits, its is another
End ground connection；
The first input end of integrating circuit, the second input terminal and output terminal are the same end.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.
As preferable scheme, reference generating circuit is current feedback circuit, and current feedback circuit directly feeds reference current I_
ref。
Using the above preferred scheme, it is simple in structure, install convenient.
As preferable scheme, reference generating circuit is GM conversion circuits, the input terminal and reference voltage of GM conversion circuits
The first input end connection of V_ref connections, its output terminal and integrating circuit.
Using the above preferred scheme, cost is low.
As preferable scheme, GM conversion circuits include：Amplifier, nmos pass transistor MN201, PMOS transistor MP201,
PMOS transistor MP202 and resistance R2；
MP201 with MP202 mirror images connect, and form mirror image unit；
The positive input of amplifier is connected with reference voltage V _ ref, and the reverse input end of amplifier is connected with resistance R2,
The output terminal of amplifier and the grid of MN201 connect；
Reverse input end of the source electrode of MN201 respectively with resistance R2 and amplifier is connected, the output of its grid and amplifier
End connection, and its drain electrode is connected by mirror image unit with control voltage V_ct1.
Using the above preferred scheme, it is simple in structure.
Brief description of the drawings
Fig. 1 is the circuit theory schematic diagram of average current constant-current control circuit provided in an embodiment of the present invention.
Fig. 2 is the circuit diagram of average current constant-current control circuit provided in an embodiment of the present invention.
Fig. 3 is the circuit diagram of the GM conversion circuits of the 2nd VI translation circuits provided in an embodiment of the present invention.
Fig. 4 is the circuit diagram of the GM conversion circuits of reference generating circuit provided in an embodiment of the present invention.
Wherein：1st, voltage source, 2, load circuit, the 3, the first VI translation circuits, 31 first input ends, the 32, second input terminal,
33rd, output terminal, 4, IV translation circuits, 41, input terminal, 42, output terminal, the 5, the 2nd VI translation circuits, 51, input terminal, 52, output
End, 6, integrating circuit, 61 first input ends, the 62, second input terminal, 63, output terminal, 7, reference generating circuit.
Embodiment
The preferred embodiment that the invention will now be described in detail with reference to the accompanying drawings.
In order to reach the purpose of the present invention, in some of embodiments of average current constant-current control circuit, such as Fig. 1 institutes
Show, average current constant-current control circuit includes：Voltage source 1, load circuit 2, the first VI translation circuits 3, IV translation circuits 4,
Two VI translation circuits 5, integrating circuit 6 and reference generating circuit 7.
Voltage source 1 is used to provide input voltage, and load circuit 2 is connected with voltage source 1.
First VI translation circuits 3 have first input end 31, the second input terminal 32 and output terminal 33, the first VI translation circuits
3 first input end 31 is connected with load circuit 2, its second input terminal 32 is connected with the output terminal 63 of integrating circuit 6, it is exported
End 33 is connected with the input terminal 41 of IV translation circuits 4, and the first VI translation circuits 3 are used for the control voltage for exporting integrating circuit 6
V_ct1 is converted into load current I_load.
The input terminal 41 of IV translation circuits 4 is connected with the output terminal 33 of the first VI translation circuits 3, its output terminal 42 and second
The input terminal 51 of VI translation circuits 5 connects, and IV translation circuits 4 are used to load current I_load being converted into sampled voltage V_s.
The input terminal 51 of 2nd VI translation circuits 5 is connected with the output terminal 42 of IV translation circuits 4, its output terminal 52 and integration
Second input terminal 62 of circuit 6 connects, and the 2nd VI translation circuits 5 are used to sampled voltage V_s being converted into feedback current I_fb.
Integrating circuit 6 has first input end 61, the second input terminal 62 and output terminal 63, the first input of integrating circuit 6
End 61 is connected with reference generating circuit 7, its second input terminal 62 is connected with the output terminal 52 of the 2nd VI translation circuits 5, it is exported
End 63 is connected with the second input terminal 32 of the first VI translation circuits 3, and integrating circuit 6 is used to occur feedback current I_fb and benchmark
The reference current I_ref that circuit 7 produces produces control voltage V_ct1.
Reference generating circuit 7 is used to produce reference current I_ref.
A kind of average current constant-current control circuit of the present invention is a closed control circuit, its is simple in structure, and cost is low, each
Each performs its own functions for circuit module, and constant current accuracy is high, and current ripples are small, and noise robustness is superior.
As shown in Fig. 2, in order to further optimize the implementation result of the present invention, in other embodiment, remaining
Feature technology is identical, and difference is, load circuit 2 is light emitting diode.
Further, the first VI translation circuits 3 include：NMOS tube, the drain electrode of NMOS tube are connected with load circuit 2, its grid
It is connected with the output terminal of integrating circuit 6, its source electrode is connected with IV translation circuits 4.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.
Further, IV translation circuits 4 include：One end of resistance R_sense, resistance R_sense become with the first VI respectively
Change the input terminal connection of the output terminal and the 2nd VI translation circuits 5 of circuit 3, its other end ground connection；
The input terminal of IV translation circuits 4 and its output terminal are the same end.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.Wherein：Sampled voltage
V_s is obtained by the following formula：V_s=I_load*R_sense.
Further, the 2nd VI translation circuits 5 are GM conversion circuits.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.Wherein：Feedback current
I_fb is obtained by the following formula：I_fb=V_s*Gm1.Gm1 is the parameter in the GM conversion circuits of the 2nd VI translation circuits 5.
Further, integrating circuit 6 includes：One end of capacitance C_int, capacitance C_int respectively with reference generating circuit 7
The second input terminal connection of output terminal, the output terminal of the 2nd VI translation circuits 5 and the first VI translation circuits 3, its another termination
Ground；
The first input end of integrating circuit 6, the second input terminal and output terminal are the same end.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.Integrating circuit 6 is used for
By feedback current I_fb and I reference current I_ref in C_int upper integrals, and produce control voltage V_ct1.And if only if I_
When the average value of ref is equal to the average value of I_fb, integrating circuit 6 produces the control voltage V_ct1 of stabilization.
Further, reference generating circuit 7 is GM conversion circuits, and input terminal and the reference voltage V _ ref of GM conversion circuits connect
Connect, its output terminal is connected with the first input end of integrating circuit 6.
Using the above preferred scheme, cost is low.Wherein：Reference current I_ref is obtained by the following formula：I_ref=V_
ref*Gm2.The parameter in the GM conversion circuits of circuit 7 occurs on the basis of Gm2.
A kind of average current current constant control control average current I_load_avg constant currents of the present invention, its specific formula are as follows：
A kind of average current constant-current control circuit of the present invention is compared to existing constant-current control circuit, and the present invention is using existing
The simple component having, cost is low, and is easy to repair and maintenance, is controlled using closed loop control method, and constant current accuracy is high, electric current
Ripple is small, and noise robustness is superior.
As shown in figure 3, further, the GM conversion circuits of the 2nd VI translation circuits 5 include：Amplifier, nmos pass transistor
MN101 and resistance R1；The positive input of amplifier is connected with sampled voltage V_s, reverse input end and the resistance R1 of amplifier
Connection, the output terminal of amplifier and the grid of MN101 connect；The source electrode of MN101 is reverse defeated with resistance R1 and amplifier respectively
Enter end connection, the output terminal connection of its grid and amplifier, and its drain electrode is connected with control voltage V_ct1.
Using the above preferred scheme, it is simple in structure, the Gm1=1/R1 of the GM conversion circuits of its 2nd VI translation circuit 5.
As shown in figure 4, further, the GM conversion circuits of reference generating circuit 7 include：Amplifier, nmos pass transistor
MN201, PMOS transistor MP201, PMOS transistor MP202 and resistance R2；
MP201 with MP202 mirror images connect, and form mirror image unit；
The positive input of amplifier is connected with reference voltage V _ ref, and the reverse input end of amplifier is connected with resistance R2,
The output terminal of amplifier and the grid of MN201 connect；
Reverse input end of the source electrode of MN201 respectively with resistance R2 and amplifier is connected, the output of its grid and amplifier
End connection, and its drain electrode is connected by mirror image unit with control voltage V_ct1.
Using the above preferred scheme, simple in structure, the GM conversion circuits of its reference generating circuit 7 are specially Gm2=
1/R2。
In order to further optimize the implementation result of the present invention, in other embodiment, remaining feature technology phase
Together, difference is, the first VI translation circuits 3 include：NPN is managed, and the collector of NPN pipes is connected with load circuit 2, its base stage
It is connected with the output terminal of integrating circuit 6, its emitter is connected with IV translation circuits 4.
Using the above preferred scheme, using simple component, cost is low, is more easy to repair and maintenance.
In order to further optimize the implementation result of the present invention, in other embodiment, remaining feature technology phase
Together, difference is, reference generating circuit 7 is current feedback circuit, and current feedback circuit directly feeds reference current I_ref.
Using the above preferred scheme, it is simple in structure, install convenient.
A kind of average current current constant control control average current I_load_avg constant currents of the present invention, its specific formula are as follows：
For the preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art, do not taking off
On the premise of conceiving from the invention, various modifications and improvements can be made, these belong to protection scope of the present invention.
Claims (10)
1. average current constant-current control circuit, including：
Voltage source, for providing input voltage；
Load circuit, is connected with voltage source；
It is characterized in that, further include：
First VI translation circuits, the first VI translation circuits have first input end, the second input terminal and output terminal, the first VI conversion
The first input end of circuit is connected with load circuit, the connection of the output terminal of its second input terminal and integrating circuit, its output terminal with
The input terminal connection of IV translation circuits, the first VI translation circuits are used to the control voltage V-ct1 of integrating circuit output being converted into
Load current I_load；
IV translation circuits, the input terminal of IV translation circuits are connected with the output terminal of the first VI translation circuits, its output terminal and second
The input terminal connection of VI translation circuits, IV translation circuits are used to load current I_load being converted into sampled voltage V_s；
2nd VI translation circuits, the input terminal of the 2nd VI translation circuits are connected with the output terminal of IV translation circuits, its output terminal with
The second input terminal connection of integrating circuit, the 2nd VI translation circuits are used to sampled voltage V_s being converted into feedback current I_fb；
Integrating circuit, integrating circuit have first input end, the second input terminal and an output terminal, the first input end of integrating circuit with
Reference generating circuit connects, its second input terminal is connected with the output terminal of the 2nd VI translation circuits, its output terminal and the first VI become
The second input terminal connection of circuit is changed, integrating circuit is used for the reference current for producing feedback current I_fb and reference generating circuit
I_ref produces control voltage V_ct1；
Reference generating circuit, for producing reference current I_ref.
2. average current constant-current control circuit according to claim 1, it is characterised in that the first VI translation circuit bags
Include：NMOS tube, the drain electrode of NMOS tube are connected with load circuit, the output terminal connection of its grid and integrating circuit, its source electrode and IV
Translation circuit connects.
3. average current constant-current control circuit according to claim 1, it is characterised in that the first VI translation circuit bags
Include：NPN is managed, and the collector of NPN pipes be connected with load circuit, and the output terminal of its base stage and integrating circuit connects, its emitter and
IV translation circuits connect.
4. according to claim 1-3 any one of them average current constant-current control circuits, it is characterised in that the IV conversion electricity
Road includes：One end of resistance R_sense, the resistance R-sense output terminal and second with the first VI translation circuits respectively
The input terminal connection of VI translation circuits, its other end ground connection；
The input terminal of the IV translation circuits and its output terminal are the same end.
5. according to claim 1-3 any one of them average current constant-current control circuits, it is characterised in that the 2nd VI becomes
It is GM conversion circuits to change circuit.
6. average current constant-current control circuit according to claim 5, it is characterised in that the GM conversion circuits include：
Amplifier, nmos pass transistor MN101 and resistance R1；
The positive input of amplifier is connected with sampled voltage V-s, and the reverse input end of amplifier is connected with resistance R1, amplifier
Output terminal and MN101 grid connect；
Reverse input end of the source electrode of MN101 respectively with resistance R1 and amplifier is connected, and the output terminal of its grid and amplifier connects
Connect, and its drain electrode is connected with control voltage V-ct1.
7. according to claim 1-3 any one of them average current constant-current control circuits, it is characterised in that the integrating circuit
Including：One end of capacitance C-int, the capacitance C-int output terminal with the reference generating circuit, the 2nd VI translation circuits respectively
Output terminal and the first VI translation circuits the second input terminal connection, its other end ground connection；
The first input end of the integrating circuit, the second input terminal and output terminal are the same end.
8. according to claim 1-3 any one of them average current constant-current control circuits, it is characterised in that the benchmark occurs
Circuit is current feedback circuit, and the current feedback circuit directly feeds reference current I_ref.
9. according to claim 1-3 any one of them average current constant-current control circuits, it is characterised in that the benchmark occurs
Circuit is GM conversion circuits, and the input terminal of the GM conversion circuits is connected with reference voltage V _ ref, its output terminal and the integration
The first input end connection of circuit.
10. average current constant-current control circuit according to claim 9, it is characterised in that the GM conversion circuits include：
Amplifier, nmos pass transistor MN201, PMOS transistor MP201, PMOS transistor MP202 and resistance R2；
MP201 with MP202 mirror images connect, and form mirror image unit；
The positive input of amplifier is connected with reference voltage V _ ref, and the reverse input end of amplifier is connected with resistance R2, amplification
The output terminal of device and the grid of MN201 connect；
Reverse input end of the source electrode of MN201 respectively with resistance R2 and amplifier is connected, and the output terminal of its grid and amplifier connects
Connect, and its drain electrode is connected by mirror image unit with control voltage V-ct1.
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| CN201711452376.6A CN107943185B (en) | 2017-12-27 | 2017-12-27 | Average current constant current control circuit |
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| CN201711452376.6A CN107943185B (en) | 2017-12-27 | 2017-12-27 | Average current constant current control circuit |
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| CN107943185B CN107943185B (en) | 2023-11-21 |
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| CN107943185B (en) | 2023-11-21 |
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Address after: 215600 4 building, H building, Zhangjiagang economic and Technological Development Zone, Jiangsu. Applicant after: SUZHOU FEIDAXU MICRO-ELECTRONICS Co.,Ltd. Address before: 215000 No. 2 Pei Yuan Road, hi tech Zone, Suzhou, Jiangsu Applicant before: SUZHOU FEIDAXU MICRO-ELECTRONICS Co.,Ltd. |
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