CN105404347B - Dual-loop feedback constant-current source circuit - Google Patents
Dual-loop feedback constant-current source circuit Download PDFInfo
- Publication number
- CN105404347B CN105404347B CN201511008766.5A CN201511008766A CN105404347B CN 105404347 B CN105404347 B CN 105404347B CN 201511008766 A CN201511008766 A CN 201511008766A CN 105404347 B CN105404347 B CN 105404347B
- Authority
- CN
- China
- Prior art keywords
- resistance
- amplifier
- module
- termination
- outfan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- G05F1/565—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/573—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
- G05F1/5735—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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector with foldback current limiting
Abstract
The invention discloses a dual-loop feedback constant-current source circuit and belongs to the technical field of electronic technology. The dual-loop feedback constant-current source circuit structurally comprises a current-limit setting module (2), a current setting module (3), a current output module (7) and a first feedback module (8). The circuit is characterized by also structurally comprising a reference voltage module (1), a subtractor module (4), a PID control module (5), an adder module (6) and a second feedback module (9). The above circuit is of a dual-loop negative feedback structure. Therefore, the output current of the circuit is high in stability and safety. The circuit can be widely applied in multiple occasions.
Description
Technical field
The invention belongs to the technical field of electronic technology.Particularly to a kind of high stability ring feedback constant-current source circuit.
Background technology
Constant-current source is in a lot of field such as LED driving, Laser Drive, sensor driving, various glow discharge source drivings
Inside there is important application.In some specific application area, the degree of stability of constant-current source output electric current is most important, as at laser
Device drives in application, and small curent change will cause the very big change of Output optical power and excitation wavelength, and these changes are directly
Jeopardize the safe handling of device.The conventional measure improving current stability, includes: 1, utilize the non-linear of magnetic saturation reactor
Magnetization principle improves stability；2, connect in load circuit big resistance (relative to load resistance)；3, negative feedback network is passed through
Realize electric current automatic stabilisation.In these several schemes, the first scheme is affected relatively big by device itself, the raising to degree of stability
Limited；First scheme, due to big resistance of having connected in load circuit, can reduce the change of load resistance effectively to output
The impact of electric current, but due to the existence of resistance big in load circuit so that export the least in the case of supply voltage is certain
Electric current, typically can only in milliampere level, and major part voltage all drop on big resistance, also make extremely inefficient；The third side
The automatic regulating function that case has due to negative feedback network itself, can make output electric current automatic stabilisation, and not changed by load
Impact, be therefore the most efficient method improving current stability, at present, but in current published technology, typically all adopt
Taking single linear feedback network, the shortcoming of this scheme is: first, once feedback network breaks down, and system will be in
Open loop duty, output electric current will be increased dramatically, it is easy to damages load and circuit itself；Secondly, use occasion is limited
System, can be only applied to the occasion that load is linear response to electric current, under some specific occasion, as the response of electric current is deposited by load
In delay or advanced situation, the constant current effect of this constant-current source based on single linear feedback network can be had a greatly reduced quality.
Summary of the invention
The technical problem to be solved in the present invention is, the shortcoming existed for prior art, it is provided that a kind of based on ring feedback
The high stability constant-current source circuit that PID controls.
The concrete technical scheme of the present invention is:
A kind of ring feedback constant-current source circuit, limited configurations stream arranges module 2, electric current arranges module 3, current output module
7 and first feedback module 8；It is characterized in that, structure also has reference voltage module 1, subtracter block 4, pid control module 5, adds
Summer block 6 and the second feedback module 9；Current limliting arranges the output of module 2 and arranges the input of module 3 with electric current and be connected, and electric current sets
The output putting module 3 connects the control input of subtracter block 4, and the feedback that the output of the second feedback module 9 connects subtracter block 4 is defeated
Entering, the output of subtracter block 4 connects the input of pid control module 5, and the output of pid control module 5 connects the defeated of adder Module 6
Entering, the reference voltage that the output of reference voltage module 1 connects subtracter block 4, pid control module 5 and adder Module 6 respectively is defeated
Entering, the output of adder Module 6 connects the control input of current output module 7, and the output of the first feedback module 8 connects electric current output mould
The feed back input of block 7, the output of current output module 7 connects the first feedback module 8 and input of the second feedback module 9；
The structure of described reference voltage module 1 is: a termination power VCC of resistance R1, and another terminates the same of amplifier U5A
Phase input and one end of resistance R2, the other end ground connection of resistance R2, one end of the anti-phase input terminating resistor R3 of amplifier U5A,
The outfan of another termination amplifier U5A of resistance R3, the positive supply termination power VCC of amplifier U5A, negative power end ground connection, amplifier
The outfan of the outfan of U5A module 1 as the reference voltage, is designated as port Vref；
Described current limliting arranges the structure of module 2: a termination power VCC of resistance R4, and another terminates slide rheostat
One end of W1 and the negative pole of Zener diode D1, the other end of slide rheostat W1 and the plus earth of Zener diode D1, sliding
The in-phase input end of termination amplifier U1A of sliding of dynamic rheostat W1, the outfan of anti-phase input termination amplifier U1A of amplifier U1A,
The positive supply termination power VCC of amplifier U1A, negative power end ground connection, the outfan of amplifier U1A arranges the defeated of module 2 as current limliting
Go out end, be designated as port Ilim；
Described electric current arranges the structure of module 3: a termination current limliting of slide rheostat W2 arranges the port of module 2
Ilim, other end ground connection, one end of the sliding end connecting resistance R5 of slide rheostat W2, another termination amplifier U1B of resistance R5
In-phase input end, the anti-phase input terminating resistor R6 of amplifier U1B and one end of resistance R7, the other end ground connection of resistance R6, resistance
The outfan of another termination amplifier U1B of R7, the outfan of amplifier U1B arranges the outfan of module 3 as electric current, is designated as port
Iset；
The structure of described subtracter block 4 is: a termination electric current of resistance R9 arranges the port Iset of module 3, another
The in-phase input end of termination amplifier U2A and one end of resistance R8, the port of another termination reference voltage module 1 of resistance R8
The port Vfd2 of one termination second feedback module 9 of Vref, resistance R10, another termination amplifier U2A inverting input and resistance
One end of R11, the outfan of another termination amplifier U2A of resistance R11, the positive supply termination power VCC of amplifier U2A, negative supply
End ground connection, the outfan of amplifier U2A, as the outfan of subtracter block 4, is designated as port Vdiff；
The structure of described pid control module 5 is: the port Vdiff of a termination subtracter block 4 of resistance R13, another
The inverting input of termination amplifier U2B and one end of resistance R12, one end of another termination slide rheostat W3 of resistance R12 is sliding
The outfan of termination amplifier U2B of sliding of dynamic rheostat W3, one end of the in-phase input end connecting resistance R16 of amplifier U2B, resistance
The port Vref of another termination reference voltage module 1 of R16, the outfan of amplifier U2B is defeated as of pid control module 5
Go out end, be designated as port Vk；The port Vdiff of the one termination subtracter block 4 of resistance R14, another termination slide rheostat W4's
One end, the inverting input of termination amplifier U3A of sliding of slide rheostat W4 and one end of electric capacity C1, another termination of electric capacity C1
The outfan of amplifier U3A, one end of the in-phase input end connecting resistance R17 of amplifier U3A, another termination reference voltage of resistance R17
The port Vref of module 1, the positive supply termination power VCC of amplifier U3A, negative power end ground connection, the outfan conduct of amplifier U3A
One outfan of pid control module 5, is designated as port Vint；The port Vdiff of the one termination subtracter block 4 of electric capacity C3, separately
The one termination inverting input of amplifier U3B, one end of electric capacity C2 and one end of resistance R15, another termination amplifier U3B of electric capacity C2
Outfan, one end of another termination slide rheostat W5 of resistance R15, termination amplifier U3B of sliding of slide rheostat W5
Outfan, one end of the in-phase input end connecting resistance R18 of amplifier U3B, the end of another termination reference voltage module 1 of resistance R18
Mouth Vref, the outfan of amplifier U3B, as an outfan of pid control module 5, is designated as port Vd；
The structure of described adder Module 6 is: the port Vk, resistance R21 of a termination pid control module 5 of resistance R20
One termination pid control module 5 port Vint, resistance R22 one termination pid control module 5 port Vd, resistance R20's
The other end of the other end, the other end of resistance R21 and resistance R22 is connected together the inverting input with amplifier U4A and resistance R19
One end be connected, resistance R19 another termination amplifier U4A outfan, resistance R23 one termination reference voltage module 1 end
Mouth Vref, the in-phase input end of another termination amplifier U4A and one end of resistance R24, the other end ground connection of resistance R24, amplifier U4A
Positive supply termination power VCC, negative power end ground connection, the outfan of amplifier U4A, as the outfan of adder Module 6, is designated as
Port Vsum；
The structure of described current output module 7 is: the port Vsum of a termination adder Module 6 of resistance R25, another
The in-phase input end of termination amplifier U5B, the port Vfd1 of termination first feedback module 8 of resistance R26, another terminates amplifier
The inverting input of U5B, one end of resistance R27 and one end of electric capacity C4, another termination power VCC of resistance R27, electric capacity C4's
The outfan of another termination amplifier U5B, the grid of the output termination metal-oxide-semiconductor Q1 of amplifier U5B, the source electrode of metal-oxide-semiconductor Q1 connects power supply
VCC, the drain electrode of metal-oxide-semiconductor Q1 connects one end of sample resistance Rref, and as an outfan of current output module 7, is designated as end
Mouth Vsam1, described metal-oxide-semiconductor Q1 are N-channel enhancement mode metal-oxide-semiconductors, and another of sample resistance Rref terminates two core interface Header2
1 foot, and as another outfan of current output module 7, be designated as port Vsam2,2 feet of two core interface Header2 connect
Ground, two core interface Header2 are as the load of the output interface connection circuit of ring feedback constant-current source circuit, and the positive pole of load connects
1 foot of two core interface Header2, the negative pole of load connects 2 feet of two core interface Header2；
The structure of the first described feedback module 8 is: the port Vsam1 of a termination current output module 7 of resistance R29,
The in-phase input end of another termination amplifier U4B and one end of resistance R28, the other end ground connection of resistance R28, one end of resistance R30
Meet the port Vsam2 of current output module 7, the inverting input of another termination amplifier U4B and one end of resistance R31, resistance R31
Another termination amplifier U4B outfan, the outfan of amplifier U4B, as the outfan of the first feedback module 8, is designated as port
Vfd1；
The structure of the second described feedback module 9 is: the in-phase input end of amplifier U6A connects the port of current output module 7
Vsam1, the positive supply termination power VCC of amplifier U6A, negative power end ground connection, the anti-phase input terminating resistor R32 of amplifier U6A, electricity
One end of resistance R33 and the sliding end of slide rheostat W6, the outfan of another termination amplifier U6A of resistance R32, amplifier U6A
Outfan, as the outfan of the second feedback module 9, is designated as the outfan of another termination amplifier U6B of port Vfd2, resistance R33
With one end of resistance R34, one end of a terminating resistor R35 of slide rheostat W6, the other end of resistance R35 and resistance R34
Be connected together one end of the inverting input with amplifier U6B and resistance R36 of the other end is connected, the other end ground connection of resistance R36, fortune
The in-phase input end putting U6B meets the port Vsam2 of current output module 7.
Each element preferred parameter used in a kind of bidirectional constant source circuit of the present invention is as follows: amplifier U1A, amplifier
U1B～amplifier U6A, amplifier U6B are TLC2252；The voltage of voltage regulation of Zener diode D1 is 2.5V；Slide rheostat W1 and cunning
It is 100k that dynamic rheostat W2 be 20k Ω, slide rheostat W3～slide rheostat W5 to be 500k Ω, slide rheostat W6
Ω；Resistance R1 and resistance R2 be 10k Ω, resistance R4～resistance R18 be 10k Ω, resistance R25, resistance R26, resistance R29 and
Resistance R30 is 10k Ω, resistance R19～resistance R22 and resistance R24 be 15k Ω, resistance R3, resistance R32～resistance R34 and
Resistance R36 is 100k Ω, resistance R28 and resistance R31 and is 200k Ω, resistance R35 is 1k Ω, and resistance R27 is 1M Ω, resistance
R23 is 5.1k Ω, and sample resistance Rref is 0.1 Ω；Electric capacity C1 is 4.7nF, and electric capacity C2 is 10pF, and electric capacity C3 is 100pF, electric capacity
C4 is 0.47uF；Metal-oxide-semiconductor Q1 is IRF530；Power supply VCC is 12V DC source.
One ring feedback constant-current source circuit of the present invention has a following beneficial effect:
1, the present invention uses dicyclo negative feedback structure, is effectively increased the degree of stability of output electric current.
2, the present invention uses dicyclo negative feedback structure, improves the safety of circuit, when a feedback loop breaks down disconnected
When opening, circuit still can normally work.
3, the present invention is to arranging electric current and feedback current employing PID control process, makes circuit equal under a lot of use occasions
Can automatic steady current.
4, the present invention comprises current limliting module, can effectively limit the maximum of output electric current so that when regulation output electric current
Not over cut-off current, further increase the safety of circuit.
5, second feedback module of the present invention uses double operational high input impedance formula subtractor to be sampled output electric current,
The feedback circuit impact on output electric current can be more effectively reduced than traditional subtractor structure.
6, the minus earth of connect load at two core interface Header2 in the present invention, it is possible to during effective guarantee loaded work piece
Safety.
Accompanying drawing explanation
Fig. 1 is the population structure block diagram of the present invention.
Fig. 2 is the schematic diagram of the reference voltage module 1 of the present invention.
Fig. 3 is the schematic diagram that the current limliting of the present invention arranges module 2.
Fig. 4 is the schematic diagram that the electric current of the present invention arranges module 3.
Fig. 5 is the schematic diagram of the subtracter block 4 of the present invention.
Fig. 6 is the schematic diagram of the pid control module 5 of the present invention.
Fig. 7 is the schematic diagram of the adder Module 6 of the present invention.
Fig. 8 is the schematic diagram of the current output module 7 of the present invention.
Fig. 9 is the schematic diagram of first feedback module 8 of the present invention.
Figure 10 is the schematic diagram of second feedback module 9 of the present invention.
Detailed description of the invention
Below by specific embodiment, the operation principle of the present invention is described further, each element in following embodiment
Selected parameter is as follows:
Amplifier U1A, amplifier U1B～amplifier U6A, amplifier U6B are TLC2252；The voltage of voltage regulation of Zener diode D1 is
2.5V；Slide rheostat W1 and slide rheostat W2 is 20k Ω, slide rheostat W3～slide rheostat W5 and is 500k
Ω, slide rheostat W6 are 100k Ω；Resistance R1 and resistance R2 is 10k Ω, resistance R4～resistance R18 and is 10k Ω, resistance
R25, resistance R26, resistance R29 and resistance R30 are 10k Ω, resistance R19～resistance R22 and resistance R24 is 15k Ω, resistance
R3, resistance R32～resistance R34 and resistance R36 are 100k Ω, resistance R28 and resistance R31 and are 200k Ω, resistance R35 is 1k
Ω, resistance R27 are 1M Ω, and resistance R23 is 5.1k Ω, and sample resistance Rref is 0.1 Ω；Electric capacity C1 is 4.7nF, and electric capacity C2 is
10pF, electric capacity C3 are 100pF, and electric capacity C4 is 0.47uF；Metal-oxide-semiconductor Q1 is IRF530；Power supply VCC is 12V DC source.
The overall structure of embodiment 1 present invention
The overall work principle of a kind of ring feedback constant-current source circuit of the present invention is described in conjunction with Fig. 1.Arranged by current limliting
Module 1 arranges a maximum controlling voltage, utilizes slide rheostat W2 that electric current can be made to arrange module 2 and exports size 0 to maximum
Controlling a control voltage between voltage, the second feedback module 9 is to output current sampling and is converted to corresponding voltage, above-mentioned
Two voltages carry out asking poor in subtracter block 4, and difference delivers to carry out in PID module 5 PID process, three voltages of gained
Signal delivers to the control input of current output module 7 after adder Module 6 is added as driving voltage, with the first feedback mould
The feedback voltage of block 8 compares, and comparative result controls the output electric current of current output module 7, and reference voltage module 1 is for being
Subtracter block 4, pid control module 5 and adder Module 6 provide necessary reference voltage, owing to whole system is in dual
Negative feedback duty, therefore, output electric current is changed arranging, in strict accordance with electric current, the control voltage that module 2 arranges.
The reference voltage module 1 of embodiment 2 present invention
The schematic circuit of the reference voltage module 1 of the present invention is as in figure 2 it is shown, a termination power VCC of resistance R1, the other end
Connect in-phase input end and one end of resistance R2 of amplifier U5A, the other end ground connection of resistance R2, the anti-phase input termination of amplifier U5A
One end of resistance R3, the outfan of another termination amplifier U5A of resistance R3, the positive supply termination power VCC of amplifier U5A, negative electricity
Source ground connection, the outfan of the outfan of amplifier U5A module 1 as the reference voltage, it is designated as port Vref.
Resistance R1 and R2 carries out dividing potential drop to 12V supply voltage, owing to two resistances are equal, so branch pressure voltage is 6V,
This voltage obtains the 6V with higher driving force with reference to electricity at outfan after the voltage follower being made up of amplifier U5A
Pressure, for providing reference voltage to subtracter block 4, pid control module 5 and adder Module 6.
The current limliting of embodiment 3 present invention arranges module 2
The current limliting of the present invention arranges the schematic circuit of module 2 as it is shown on figure 3, a termination power VCC of resistance R4, the other end
Connect one end and the negative pole of Zener diode D1 of slide rheostat W1, the other end of slide rheostat W1 and Zener diode D1's
Plus earth, the in-phase input end of termination amplifier U1A of sliding of slide rheostat W1, the anti-phase input termination amplifier of amplifier U1A
The outfan of U1A, the positive supply termination power VCC of amplifier U1A, negative power end ground connection, the outfan of amplifier U1A sets as current limliting
Put the outfan of module 2, be designated as port Ilim.
The two ends that Zener diode D1 is slide rheostat W1 provide the reference voltage of 2.5V, when the cunning of slide rheostat W1
When moved end slides up and down, sliding end voltage will change in the range of 0V～2.5V, the voltage that this magnitude of voltage is constituted through amplifier U1A
Obtain, at outfan, the limit voltage that driving force is higher after follower.
The electric current of embodiment 4 present invention arranges module 3
The electric current of the present invention arranges the schematic circuit of module 3 as shown in Figure 4, and a termination current limliting of slide rheostat W2 is arranged
The port Ilim of module 2, other end ground connection, one end of the sliding end connecting resistance R5 of slide rheostat W2, the other end of resistance R5
Connect the in-phase input end of amplifier U1B, the anti-phase input terminating resistor R6 of amplifier U1B and one end of resistance R7, another of resistance R6
End ground connection, the outfan of another termination amplifier U1B of resistance R7, the outfan of amplifier U1B arranges the output of module 3 as electric current
End, is designated as port Iset.
Between the two of slide rheostat W2 fixing end, voltage arranges the limit voltage of module 2 output equal to current limliting, becomes when sliding
When the sliding end of resistance device W2 slides up and down, sliding end voltage will change in the range of 0V～limit voltage, and this magnitude of voltage is through fortune
After putting the in-phase proportion amplifier amplification 2 times that U1B is constituted, output is to subtracter block 4.
Embodiment 5 subtracter block 4
The schematic circuit of the subtracter block 4 of the present invention is as it is shown in figure 5, a termination electric current of resistance R9 arranges module 3
Port Iset, the in-phase input end of another termination amplifier U2A and one end of resistance R8, another termination reference voltage mould of resistance R8
The port Vfd2 of one termination second feedback module 9 of the port Vref of block 1, resistance R10, another terminates amplifier U2A anti-phase input
End and one end of resistance R11, the outfan of another termination amplifier U2A of resistance R11, the positive supply termination power of amplifier U2A
VCC, negative power end ground connection, the outfan of amplifier U2A, as the outfan of subtracter block 4, is designated as port Vdiff.
This subtracter block is the 1:1 times of subtractor exported, and the size of output voltage is that the voltage of port Vref adds upper end
The difference in voltage of mouth Iset and port Vfd2.
Embodiment 6 pid control module 5
As shown in Figure 6, the one of resistance R13 terminates subtracter block 4 to the schematic circuit of the pid control module 5 of the present invention
Port Vdiff, the inverting input of another termination amplifier U2B and one end of resistance R12, another termination of resistance R12 is slided and is become
One end of resistance device W3, the outfan of termination amplifier U2B of sliding of slide rheostat W3, the in-phase input end connecting resistance of amplifier U2B
One end of R16, the port Vref of another termination reference voltage module 1 of resistance R16, the outfan of amplifier U2B is as PID control
One outfan of module 5, is designated as port Vk；The port Vdiff of the one termination subtracter block 4 of resistance R14, another terminates sliding
One end of dynamic rheostat W4, the inverting input of termination amplifier U3A of sliding of slide rheostat W4 and one end of electric capacity C1, electric capacity
The outfan of another termination amplifier U3A of C1, one end of the in-phase input end connecting resistance R17 of amplifier U3A, another of resistance R17
The port Vref of termination reference voltage module 1, the positive supply termination power VCC of amplifier U3A, negative power end ground connection, amplifier U3A
Outfan, as an outfan of pid control module 5, is designated as port Vint；The end of the one termination subtracter block 4 of electric capacity C3
Mouthful Vdiff, another termination inverting input of amplifier U3B, one end of electric capacity C2 and one end of resistance R15, another of electric capacity C2
The outfan of termination amplifier U3B, one end of another termination slide rheostat W5 of resistance R15, the sliding end of slide rheostat W5
Connecing the outfan of amplifier U3B, one end of the in-phase input end connecting resistance R18 of amplifier U3B, another termination of resistance R18 is with reference to electricity
The port Vref of die block 1, the outfan of amplifier U3B, as an outfan of pid control module 5, is designated as port Vd.
The difference voltage that subtracter block 4 is exported by this circuit carries out ratio, integration, differentiate after again output to addition
Device module 6.
Embodiment 7 adder Module 6
The schematic circuit of the adder Module 6 of the present invention is as it is shown in fig. 7, a termination pid control module 5 of resistance R20
The end of the one termination pid control module 5 of the port Vint, resistance R22 of the one termination pid control module 5 of port Vk, resistance R21
Mouthful Vd, it is anti-phase that the other end of the other end of resistance R20, the other end of resistance R21 and resistance R22 is connected together with amplifier U4A
Input is connected with one end of resistance R19, the outfan of another termination amplifier U4A of resistance R19, a termination ginseng of resistance R23
Examining the port Vref of voltage module 1, the in-phase input end of another termination amplifier U4A and one end of resistance R24, resistance R24's is another
One end ground connection, the positive supply termination power VCC of amplifier U4A, negative power end ground connection, the outfan of amplifier U4A is as adder mould
The outfan of block 6, is designated as port Vsum.
This circuit is by the ratio-voltage of pid control module 5 output port Vk, the integral voltage of port Vint and port Vd
Differential voltage is added, and eliminates after the 6V reference voltage of port Vref output again to current output module 7.
Embodiment 8 current output module 7
As shown in Figure 8, the one of resistance R25 terminates the end of adder Module 6 to the schematic diagram of the current output module 7 of the present invention
Mouth Vsum, the in-phase input end of another termination amplifier U5B, the port Vfd1 of termination first feedback module 8 of resistance R26, separately
The one termination inverting input of amplifier U5B, one end of resistance R27 and one end of electric capacity C4, another termination power of resistance R27
The outfan of another termination amplifier U5B of VCC, electric capacity C4, the grid of the output termination metal-oxide-semiconductor Q1 of amplifier U5B, metal-oxide-semiconductor Q1's
Source electrode meets power supply VCC, and the drain electrode of metal-oxide-semiconductor Q1 connects one end of sample resistance Rref, and as an output of current output module 7
End, being designated as port Vsam1, described metal-oxide-semiconductor Q1 is N-channel enhancement mode metal-oxide-semiconductor, and another of sample resistance Rref terminates two cores and connect
1 foot of mouth Header2, and as another outfan of current output module 7, it is designated as port Vsam2, two core interfaces
The 2 foot ground connection of Header2, two core interface Header2 connect the negative of circuit as the output interface of ring feedback constant-current source circuit
Carrying, the positive pole of load connects 1 foot of two core interface Header2, and the negative pole of load connects 2 feet of two core interface Header2；
This circuit utilizes the difference voltage of port Vsum and port Vfd1 to control the unlatching journey of N-channel enhancement mode metal-oxide-semiconductor Q1
Degree, thus determines the output size of current to load.
Embodiment 9 first feedback module 8
First feedback module 8 of the present invention is as it is shown in figure 9, the one of resistance R29 terminates the port of current output module 7
Vsam1, the in-phase input end of another termination amplifier U4B and one end of resistance R28, the other end ground connection of resistance R28, resistance R30
The port Vsam2 of a termination current output module 7, another termination inverting input of amplifier U4B and one end of resistance R31,
The outfan of another termination amplifier U4B of resistance R31, the outfan of amplifier U4B is as the outfan of the first feedback module 8, note
For port Vfd1.
This module will deliver to electric current output after the voltage amplification 20 times at the sample resistance Rref two ends in current output module 7
The feedback input end of module 7, compares with the voltage controlling the port Vsum that input receives of current output module 7, flat
During weighing apparatus, both voltage is equal, and current output module 7 output gives the size of current being connected on two core interface Header2 load identical
The amplification of subtractor in the voltage of port Vsum is divided by the first feedback module 8, thus realize Control of Voltage constant current output
Function.
Embodiment 10 second feedback module 9
As shown in Figure 10, the in-phase input end of amplifier U6A connects electric current output to the schematic diagram of second feedback module 9 of the present invention
The port Vsam1 of module 7, the positive supply termination power VCC of amplifier U6A, negative power end ground connection, the inverting input of amplifier U6A
Connecting resistance R32, one end of resistance R33 and the sliding end of slide rheostat W6, the output of another termination amplifier U6A of resistance R32
End, the outfan of amplifier U6A, as the outfan of the second feedback module 9, is designated as another termination fortune of port Vfd2, resistance R33
Put outfan and one end of resistance R34 of U6B, one end of a terminating resistor R35 of slide rheostat W6, another of resistance R35
The one end holding be connected together with the other end of resistance the R34 inverting input with amplifier U6B and resistance R36 is connected, resistance R36's
Other end ground connection, the in-phase input end of amplifier U6B meets the port Vsam2 of current output module 7.
This module is by adjusting slide rheostat W6, by the voltage at the sample resistance Rref two ends in current output module 7
Delivering to subtracter block 4 after amplifying 20 times, the voltage that arranging module 3 with electric current provides carries out asking poor in subtractor.
Claims (2)
1. a ring feedback constant-current source circuit, limited configurations stream arranges module (2), electric current arranges module (3), electric current output mould
Block (7) and the first feedback module (8)；It is characterized in that, structure also has reference voltage module (1), subtracter block (4), PID to control
Molding block (5), adder Module (6) and the second feedback module (9)；Current limliting arranges the output of module (2) and arranges module with electric current
(3) input is connected, and electric current arranges the output of module (3) and connects the control input of subtracter block (4), the second feedback module (9)
Output connect the feed back input of subtracter block (4), the output of subtracter block (4) meets the input of pid control module (5), PID
The output of control module (5) connects the input of adder Module (6), and the output of reference voltage module (1) connects subtracter block respectively
(4), the reference voltage input of pid control module (5) and adder Module (6), the output of adder Module (6) connects electric current output
The control input of module (7), the output of the first feedback module (8) connects the feed back input of current output module (7), electric current output mould
The output of block (7) connects the first feedback module (8) and the input of the second feedback module (9)；
The structure of described reference voltage module (1) is: a termination power VCC of resistance R1, the homophase of another termination amplifier U5A
Input and one end of resistance R2, the other end ground connection of resistance R2, one end of the anti-phase input terminating resistor R3 of amplifier U5A, electricity
The outfan of another termination amplifier U5A of resistance R3, the positive supply termination power VCC of amplifier U5A, negative power end ground connection, amplifier U5A
The outfan of outfan module as the reference voltage (1), be designated as port Vref；
Described current limliting arranges the structure of module (2): a termination power VCC of resistance R4, and another terminates slide rheostat W1
One end and the negative pole of Zener diode D1, the other end of slide rheostat W1 and the plus earth of Zener diode D1, slide
The in-phase input end of termination amplifier U1A of sliding of rheostat W1, the outfan of anti-phase input termination amplifier U1A of amplifier U1A, fortune
Putting the positive supply termination power VCC of U1A, negative power end ground connection, the outfan of amplifier U1A arranges the defeated of module (2) as current limliting
Go out end, be designated as port Ilim；
Described electric current arranges the structure of module (3): a termination current limliting of slide rheostat W2 arranges the port of module (2)
Ilim, other end ground connection, one end of the sliding end connecting resistance R5 of slide rheostat W2, another termination amplifier U1B of resistance R5
In-phase input end, the anti-phase input terminating resistor R6 of amplifier U1B and one end of resistance R7, the other end ground connection of resistance R6, resistance
The outfan of another termination amplifier U1B of R7, the outfan of amplifier U1B arranges the outfan of module (3) as electric current, is designated as end
Mouth Iset；
The structure of described subtracter block (4) is: a termination electric current of resistance R9 arranges the port Iset of module (3), another
The in-phase input end of termination amplifier U2A and one end of resistance R8, the port of another termination reference voltage module (1) of resistance R8
The port Vfd2 of one termination the second feedback module (9) of Vref, resistance R10, another termination amplifier U2A inverting input and resistance
One end of R11, the outfan of another termination amplifier U2A of resistance R11, the positive supply termination power VCC of amplifier U2A, negative supply
End ground connection, the outfan of amplifier U2A, as the outfan of subtracter block (4), is designated as port Vdiff；
The structure of described pid control module (5) is: the port Vdiff of termination subtracter block (4) of resistance R13, another
The inverting input of termination amplifier U2B and one end of resistance R12, one end of another termination slide rheostat W3 of resistance R12 is sliding
The outfan of termination amplifier U2B of sliding of dynamic rheostat W3, one end of the in-phase input end connecting resistance R16 of amplifier U2B, resistance
The port Vref of another termination reference voltage module (1) of R16, the outfan of amplifier U2B is as the one of pid control module (5)
Individual outfan, is designated as port Vk；The port Vdiff of one termination subtracter block (4) of resistance R14, another terminates slip variable resistance
One end of device W4, the inverting input of termination amplifier U3A of sliding of slide rheostat W4 and one end of electric capacity C1, electric capacity C1's is another
The outfan of one termination amplifier U3A, one end of the in-phase input end connecting resistance R17 of amplifier U3A, another termination ginseng of resistance R17
Examine the port Vref of voltage module (1), the positive supply termination power VCC of amplifier U3A, negative power end ground connection, the output of amplifier U3A
Hold an outfan as pid control module (5), be designated as port Vint；The end of one termination subtracter block (4) of electric capacity C3
Mouthful Vdiff, another termination inverting input of amplifier U3B, one end of electric capacity C2 and one end of resistance R15, another of electric capacity C2
The outfan of termination amplifier U3B, one end of another termination slide rheostat W5 of resistance R15, the sliding end of slide rheostat W5
Connecing the outfan of amplifier U3B, one end of the in-phase input end connecting resistance R18 of amplifier U3B, another termination of resistance R18 is with reference to electricity
The port Vref of die block (1), the outfan of amplifier U3B, as an outfan of pid control module (5), is designated as port Vd；
The structure of described adder Module (6) is: the port Vk, resistance R21 of termination pid control module (5) of resistance R20
One termination pid control module (5) port Vint, resistance R22 one termination pid control module (5) port Vd, resistance
The other end of the other end of R20, the other end of resistance R21 and resistance R22 is connected together the inverting input with amplifier U4A and electricity
One end of resistance R19 is connected, the outfan of another termination amplifier U4A of resistance R19, a termination reference voltage module of resistance R23
(1) port Vref, the in-phase input end of another termination amplifier U4A and one end of resistance R24, the other end ground connection of resistance R24,
The positive supply termination power VCC of amplifier U4A, negative power end ground connection, the outfan of amplifier U4A is defeated as adder Module (6)
Go out end, be designated as port Vsum；
The structure of described current output module (7) is: the port Vsum of termination adder Module (6) of resistance R25, another
The in-phase input end of termination amplifier U5B, the port Vfd1 of a termination the first feedback module (8) of resistance R26, another terminates amplifier
The inverting input of U5B, one end of resistance R27 and one end of electric capacity C4, another termination power VCC of resistance R27, electric capacity C4's
The outfan of another termination amplifier U5B, the grid of the output termination metal-oxide-semiconductor Q1 of amplifier U5B, the drain electrode of metal-oxide-semiconductor Q1 connects power supply
VCC, the source electrode of metal-oxide-semiconductor Q1 connects one end of sample resistance Rref, and as an outfan of current output module (7), is designated as
Port Vsam1, described metal-oxide-semiconductor Q1 are N-channel enhancement mode metal-oxide-semiconductors, and another of sample resistance Rref terminates two core interfaces
1 foot of Header2, and as another outfan of current output module (7), it is designated as port Vsam2, two core interfaces
The 2 foot ground connection of Header2, two core interface Header2 connect the negative of circuit as the output interface of ring feedback constant-current source circuit
Carrying, the positive pole of load connects 1 foot of two core interface Header2, and the negative pole of load connects 2 feet of two core interface Header2；
The structure of described the first feedback module (8) is: the port Vsam1 of termination current output module (7) of resistance R29,
The in-phase input end of another termination amplifier U4B and one end of resistance R28, the other end ground connection of resistance R28, one end of resistance R30
Meet the port Vsam2 of current output module (7), the inverting input of another termination amplifier U4B and one end of resistance R31, resistance
The outfan of another termination amplifier U4B of R31, the outfan of amplifier U4B, as the outfan of the first feedback module (8), is designated as
Port Vfd1；
The structure of described the second feedback module (9) is: the in-phase input end of amplifier U6A connects the port of current output module (7)
Vsam1, the positive supply termination power VCC of amplifier U6A, negative power end ground connection, the anti-phase input terminating resistor R32 of amplifier U6A, electricity
One end of resistance R33 and the sliding end of slide rheostat W6, the outfan of another termination amplifier U6A of resistance R32, amplifier U6A
Outfan, as the outfan of the second feedback module (9), is designated as the output of another termination amplifier U6B of port Vfd2, resistance R33
End and one end of resistance R34, one end of a terminating resistor R35 of slide rheostat W6, the other end of resistance R35 and resistance R34
Be connected together one end of the inverting input with amplifier U6B and resistance R36 of the other end be connected, the other end ground connection of resistance R36,
The in-phase input end of amplifier U6B meets the port Vsam2 of current output module (7).
A kind of ring feedback constant-current source circuit the most according to claim 1, it is characterised in that unit used in each module
Part parameter is: amplifier U1A and amplifier U1B be model be two working cells of the integrated double operational of TLC2252, amplifier
U2A and amplifier U2B be second model be two working cells of the integrated double operational of TLC2252, amplifier U3A and amplifier U3B
Be the 3rd model be two working cells of the integrated double operational of TLC2252, amplifier U4A and amplifier U4B are the 4th models
For two working cells of the integrated double operational of TLC2252, amplifier U5A and amplifier U5B be the 5th model be the collection of TLC2252
Become two working cells of double operational, amplifier U6A and amplifier U6B be the 6th model be the two of the integrated double operational of TLC2252
Individual working cell；The voltage of voltage regulation of Zener diode D1 is 2.5V；Slide rheostat W1 and slide rheostat W2 is 20k Ω,
It is 100k Ω that slide rheostat W3～slide rheostat W5 is 500k Ω, slide rheostat W6；Resistance R1 and resistance R2 is
10k Ω, resistance R4～resistance R18 are 10k Ω, resistance R25, resistance R26, resistance R29 and resistance R30 and are 10k Ω, resistance
R19～resistance R22 and resistance R24 is 15k Ω, resistance R3, resistance R32～resistance R34 and resistance R36 is 100k Ω, electricity
It is 1k Ω that resistance R28 and resistance R31 is 200k Ω, resistance R35, and resistance R27 is 1M Ω, and resistance R23 is 5.1k Ω, sample resistance
Rref is 0.1 Ω；Electric capacity C1 is 4.7nF, and electric capacity C2 is 10pF, and electric capacity C3 is 100pF, and electric capacity C4 is 0.47uF；Metal-oxide-semiconductor Q1 is
IRF530；Power supply VCC is 12V DC source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008766.5A CN105404347B (en) | 2015-12-29 | 2015-12-29 | Dual-loop feedback constant-current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511008766.5A CN105404347B (en) | 2015-12-29 | 2015-12-29 | Dual-loop feedback constant-current source circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105404347A CN105404347A (en) | 2016-03-16 |
| CN105404347B true CN105404347B (en) | 2017-01-11 |
Family
ID=55469884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511008766.5A Expired - Fee Related CN105404347B (en) | 2015-12-29 | 2015-12-29 | Dual-loop feedback constant-current source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105404347B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107748334B (en) * | 2017-10-12 | 2023-08-29 | 广州胜创电子设备有限公司 | Feed net type nickel battery formation detection system |
| CN109713564B (en) * | 2018-12-26 | 2020-08-07 | 吉林大学 | Impedance self-adaptive laser diode driver |
| CN109546528B (en) * | 2018-12-26 | 2020-08-07 | 吉林大学 | Impedance self-adaptive laser diode driving circuit |
| CN109346918B (en) * | 2018-12-26 | 2020-09-15 | 吉林大学 | Portable impedance self-adaptive laser diode driving module |
| CN109358695B (en) * | 2018-12-26 | 2020-08-11 | 吉林大学 | Load self-adaptive constant current source device |
| CN109656297B (en) * | 2018-12-26 | 2020-10-20 | 吉林大学 | Program-controlled load self-adaptive constant current source module |
| CN109524876B (en) * | 2018-12-26 | 2020-12-01 | 吉林大学 | Program-controlled impedance self-adaptive laser diode driving module |
| CN109659811B (en) * | 2018-12-26 | 2020-08-07 | 吉林大学 | Digital impedance self-adaptive laser diode driver |
| CN110989715B (en) * | 2019-11-26 | 2022-03-25 | 山东航天电子技术研究所 | High-stability constant current source generating circuit and temperature measuring circuit |
| CN116009635B (en) * | 2023-01-04 | 2023-08-15 | 北京东方锐镭科技有限公司 | Driving circuit for voltage-controlled current output |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008060492A (en) * | 2006-09-04 | 2008-03-13 | Matsushita Electric Ind Co Ltd | Light-emitting device drive |
| US7595622B1 (en) * | 2007-04-05 | 2009-09-29 | National Semiconductor Corporation | System and method for providing a sample and hold circuit for maintaining an output voltage of a constant current source circuit when a feedback loop is disconnected |
| CN101295188B (en) * | 2008-05-26 | 2010-07-14 | 中国航天科技集团公司第五研究院第五一四研究所 | DC small current constant-current source and calibration method thereof |
| CN103034274B (en) * | 2012-12-12 | 2014-07-23 | 常州大学 | Constant-current source for temperature measuring circuit |
| CN103021117B (en) * | 2012-12-12 | 2014-08-13 | 常州大学 | Electrical fire detector based on temperature detection |
-
2015
- 2015-12-29 CN CN201511008766.5A patent/CN105404347B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105404347A (en) | 2016-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105404347B (en) | Dual-loop feedback constant-current source circuit | |
| CN105528009B (en) | A kind of portable bidirectional constant source module | |
| CN106154134B (en) | A kind of IGCT four-quadrant trigger characteristic parameter test device | |
| CN105487586B (en) | A kind of portable ring feedback constant current source module | |
| CN105549669B (en) | A kind of based on the degenerative constant-current source device of dicyclo | |
| CN108563255A (en) | A kind of temperature control circuit, electronic cigarette temperature control method and computer readable storage medium | |
| CN201007805Y (en) | Digital type adjustable constant-current constant voltage source | |
| CN105388952B (en) | A kind of bidirectional constant source circuit | |
| CN201917840U (en) | Voltage regulator | |
| CN105425884B (en) | A kind of bidirectional constant source apparatus based on dual negative feedback control | |
| CN104377770A (en) | Charge control circuit and method of multiple lithium batteries and general type charger | |
| CN218614063U (en) | Force sensing electric clamping jaw driving circuit | |
| CN102830629B (en) | Testing device and method of power electronic control system | |
| CN101387893B (en) | Electrical heating power closed-loop control method | |
| CN203012565U (en) | Simple multi-voltage and multi-current feedback control circuit capable of accurately adjusting | |
| CN206649363U (en) | Heating control circuit and temperature measuring equipment | |
| CN206099804U (en) | Switch steady voltage source system based on UC3843 | |
| CN205721468U (en) | A kind of constant-current source circuit | |
| CN109656150B (en) | High-precision deviation control method of composite shaft control system based on matlab | |
| CN106787772A (en) | A kind of doubleway output DC DC changer systems and its control method | |
| CN211180801U (en) | Multi-interface SE chip verification device | |
| CN205945520U (en) | Constant voltage type switching power supply realizes constant current output characteristic's control scheme structure | |
| CN205787993U (en) | A kind of high-precision current source | |
| CN103560531B (en) | Many SMES coordinated control system based on immune genetic algorithm and method | |
| CN203397248U (en) | Stabilized voltage supply based on digital potentiometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20181229 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |