CN105425884B - A kind of bidirectional constant source apparatus based on dual negative feedback control - Google Patents
A kind of bidirectional constant source apparatus based on dual negative feedback control Download PDFInfo
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- CN105425884B CN105425884B CN201511008770.1A CN201511008770A CN105425884B CN 105425884 B CN105425884 B CN 105425884B CN 201511008770 A CN201511008770 A CN 201511008770A CN 105425884 B CN105425884 B CN 105425884B
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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
- G05F1/461—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using an operational amplifier as final control device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
A kind of based on dual negative feedback control the bidirectional constant source apparatus of the present invention belongs to the technical field of electronic technology, and its structure has front panel (10), electric current to arrange module (1), output control module (5), power output module (6) and the first feedback module (7)；It is characterized in that, structure also has subtracter block (2), PID module (3), current limliting to arrange module (4), the second feedback module (8) and driver module (9).The present invention uses dual negative feedback structure, has the features such as outputting current steadily is high, safety is high, use occasion is extensive, and current limiting arranges function, also can realize exporting electric current two-ways regulation.
Description
Technical field
The invention belongs to the technical field of electronic technology.Particularly to a kind of high stability based on dual negative feedback control
Bidirectional constant source apparatus.
Background technology
Constant-current source has important application in a lot of occasion such as fiber optic communication, LED illumination, Laser Drive, and at some
Occasion, in Laser Drive, the outputting current steadily degree of constant-current source is most important, and the instability of output electric current can affect laser
The life-span of device and Output optical power.The conventional measure improving current stability has: 1, utilize the non-thread of magnetic saturation reactor
Property magnetization principle improve stability；2, connect in load circuit big resistance (relative to load resistance)；3, by negative feedback net
Network realizes electric current automatic stabilisation.In these several schemes, the first scheme is affected relatively big by device itself, carries degree of stability
High limited；First scheme, due to big resistance of having connected in load circuit, can reduce the change of load resistance effectively to defeated
Go out the impact of electric current, but due to the existence of the big resistance of load circuit so that output electric current is the least, typically can only in milliampere level, and
And major part power all drops on big resistance, also make extremely inefficient；The third scheme has due to negative feedback network itself
Automatic regulating function, can make output electric current automatic stabilisation, and not changed by load and affected, therefore be to improve electric current at present
The most efficient method of degree of stability, but in current published technology, typically all take single linear feedback network, this
The disadvantage that scheme exists is that once feedback network breaks down, and system will be in open loop duty, and output electric current will be anxious
Increasing severely big, it is easy to damaging load and circuit itself, another shortcoming is that use occasion is restricted, it is right to can be only applied to load
Electric current is the occasion of linear response, under some specific occasion, there is delay or advanced situation as loaded to respond electric current,
This constant-current source based on single linear feedback network will lose autostable ability.The most common constant-current source is most
Being all unidirectional output, when some occasion (as controlled temperature device heating or refrigeration) needs bidirectional current, its use will be subject to
To limiting.
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 dual negative anti-
The high stability bidirectional constant source apparatus that feedback controls.
The concrete technical scheme of the present invention is:
A kind of bidirectional constant source apparatus based on dual negative feedback control, structure have front panel 10, electric current arrange module 1,
Output control module 5, power output module 6 and the first feedback module 7；It is characterized in that, structure also has subtracter block 2, PID
Module 3, current limliting arrange module the 4, second feedback module 8 and driver module 9；Electric current arranges the outfan and second of module 1
The outfan of feedback module 8 is connected with the input of subtracter block 2, and the output of subtracter block 2 terminates the defeated of PID module 3
Entering end, the output termination current limliting of PID module 3 arranges the input of module 4, and current limliting arranges an output termination output of module 4
The control input of control module 5, the feedback input end of the output termination output control module 5 of the first feedback module 7, output control
The input of the output termination power output module 6 of molding block 5, it is anti-that the feedback output end of power output module 6 connects first simultaneously
The input of feedback module 7 and the input of the second feedback module 8, current limliting arranges another two outfan and first feedback of module 4
The outfan of module 7 connects three selection ends of switch SW1, the input of the public termination driver module 9 of switch SW1 respectively
End, the signal that the outfan of driver module 9 connects digital voltage gauge outfit 103 on front panel 10 by two core interface JP5 is defeated
Enter end；
Described electric current arranges the structure of module 1: a termination power VCC of resistance R1, and another terminates Zener diode
The negative electrode of D1 and 3 feet of 3 core interface JP1, the plus earth of Zener diode D1, a termination power VEE of resistance R2, the other end
Connect anode and 1 foot of 3 core interface JP1 of Zener diode D2, the minus earth of Zener diode D2,2 feet of 3 core interface JP1
One end of connecting resistance R3, the in-phase input end of another termination amplifier U1A of resistance R3, the anti-phase input terminating resistor of amplifier U1A
One end of R4 and one end of resistance R5, the other end ground connection of resistance R4, the outfan of another termination amplifier U1A of resistance R5, fortune
Putting the positive supply termination power VCC of U1A, negative supply termination power VEE, the outfan of amplifier U1A arranges module 1 as electric current
Outfan, is designated as port M1_OUT, meets the port M2_IN1 of subtracter block 2；
The structure of described subtracter block 2 is: one end of resistance R6 is as an input of subtracter block 2, note
For port M2_IN2, the other end of the anti-phase input terminating resistor R6 of amplifier U1B and one end of resistance R9, the other end of resistance R9
Connecing the outfan of amplifier U1B, one end of resistance R7, as another input of subtracter block 2, is designated as port M2_IN1, fortune
Put the other end and one end of resistance R8 of the in-phase input end connecting resistance R7 of U1B, the other end ground connection of resistance R8, amplifier U1B
Outfan, as the outfan of subtracter block 2, is designated as port M2_OUT, meets the port M3_IN of PID module 3；
The structure of described PID module 3 is: an end of one end of resistance R10, one end of resistance R17 and resistance R14 is connected on
Together, as the input of PID module 3, it is designated as one end of another termination slide rheostat W1 of port M3_IN, resistance R10,
The other end of slide rheostat W1 and end of slide wire connect the inverting input of amplifier U2A jointly, the inverting input of amplifier U2A and defeated
Go out the indirect resistance R11 of end, one end ground connection of resistance R12, the in-phase input end of another termination amplifier U2A, the positive electricity of amplifier U2A
Source termination power VCC, negative supply termination power VEE, one end of the outfan connecting resistance R13 of amplifier U2A, amplifier U2B anti-phase
The other end of input connecting resistance R14 and one end of electric capacity C1, the outfan of another termination amplifier U2B of electric capacity C1, resistance R15
One end ground connection, another termination amplifier U2B in-phase input end, one end of the outfan connecting resistance R16 of amplifier U2B, resistance R17
One end of another termination capacitor C2, the other end of the anti-phase input termination electric capacity C2 of amplifier U3A and one end of resistance R18 and electricity
Hold one end of C3, the other end of electric capacity C3 and the outfan of another termination amplifier U3A of resistance R18, a termination of resistance R19
Ground, the in-phase input end of another termination amplifier U3A, the positive supply termination power VCC of amplifier U3A, negative supply termination power VEE,
One end of the outfan connecting resistance R20 of amplifier U3A, another of the other end of resistance R13, the other end of resistance R16 and resistance R20
End connects the inverting input of amplifier U3B jointly, and the inverting input of termination amplifier U3B of resistance R21, another terminates amplifier
The outfan of U3B, the in-phase input end of termination amplifier U3B of resistance R22, other end ground connection, the outfan conduct of amplifier U3B
The outfan of PID module 3, is designated as port M3_OUT, connects current limliting and arranges the port M4_IN of module 4；
Described current limliting arranges the structure of module 4: a termination power VCC of resistance R29, and another terminates 3 core interface JP2
3 feet, the 1 foot ground connection of 3 core interface JP2, one end of 2 foot connecting resistance R24, and second output of module 4 is set as current limliting
End, is designated as port M4_OUT2, the other end of the in-phase input end connecting resistance R24 of amplifier U4B, inverting input and outfan it
Indirect resistance R23, the negative electrode of output terminating diode D3, the anode of diode D3 connects the in-phase input end of amplifier U5B, resistance
The one termination power VEE of R30, another terminates 3 feet of 3 core interface JP3, the 1 foot ground connection of 3 core interface JP3,2 foot connecting resistance R26's
One end, and the 3rd outfan of module 4 is set as current limliting, it being designated as port M4_OUT3, the in-phase input end of amplifier U4A connects
The indirect resistance R25 of the other end of resistance R26, inverting input and outfan, the anode of output terminating diode D4, diode
The negative electrode of D4 connects the in-phase input end of amplifier U5B, the positive supply termination power VCC of amplifier U4A, negative supply termination power VEE, fortune
Put the in-phase input end of termination amplifier U5B of the inverting input of U5B and the indirect resistance R28 of outfan, resistance R27, separately
One end arranges the input of module 4 as current limliting, is designated as port M4_IN, and the outfan of amplifier U5B arranges module 4 as current limliting
First outfan, be designated as port M4_OUT1, meet the port M5_IN of output control module 5；
The structure of described output control module 5 is: the positive supply termination power VCC of amplifier U5A, negative supply termination power
The indirect electric capacity C4 of VEE, inverting input and outfan, one end of output termination capacitor C5 and one end of resistance R31, electric capacity C5
Other end ground connection, resistance R31 another termination amplifier U6B inverting input, the in-phase input end ground connection of amplifier U6B, instead
The indirect resistance R32 of phase input and outfan, one end of output termination capacitor C6, the other end ground connection of electric capacity C6, amplifier U5A
In-phase input end as the control input of output control module 5, be designated as port M5_IN, the inverting input of amplifier U5A is made
For the feedback input end of output control module 5, being designated as port F_IN, the outfan of amplifier U5A is as the one of output control module 5
Individual outfan, is designated as port M5_OUT1, meets the port M6_IN1 of power output module 6, and the outfan of amplifier U6B is as output
Another outfan of control module 5, is designated as port M5_OUT2, meets the port M6_IN2 of power output module 6；
The structure of described power output module 6 is: one end of resistance R33 is as an input of power output module 6
End, is designated as port M6_IN1, and one end of resistance R34, as another input of power output module 6, is designated as port M6_
IN2, the other end of resistance R33 connects base stage and the base stage of Darlington transistor Q2 of Darlington transistor Q1, and the colelctor electrode of Darlington transistor Q1 connects
Power supply VCC, emitter stage connects the emitter stage of Darlington transistor Q2, and the colelctor electrode of Darlington transistor Q2 connects another of power supply VEE, resistance R34
The base stage of termination Darlington transistor Q3 and the base stage of Darlington transistor Q4, the colelctor electrode of Darlington transistor Q3 meets power supply VCC, and emitter stage accesses
The emitter stage of Islington pipe Q4, the colelctor electrode of Darlington transistor Q4 meets power supply VEE, described Darlington transistor Q1 and Darlington transistor Q3 and is
NPN type, Darlington transistor Q2 and Darlington transistor Q4 is positive-negative-positive, and one end of sample resistance Rs connects the emitter stage of Darlington transistor Q1,
And as a feedback output end of power output module 6, it is designated as port M6_OUT1, meet the port M7_ of the first feedback module 7
Another of IN1 and the port M8_IN1 of the second feedback module 8, sample resistance Rs terminates 1 foot of 2 core interface JP4, and as power
Another feedback output end of output module 6, is designated as port M6_OUT2, meets the port M7_IN2 and second of the first feedback module 7
The emitter stage of the port M8_IN2 of feedback module 8, Darlington transistor Q3 and the emitter stage of Darlington transistor Q4 meet 2 core interface JP4 jointly
2 feet；
The structure of the first described feedback module 7 is: the positive supply termination power VCC of amplifier U6A, negative supply termination power
VEE, one end of in-phase input end connecting resistance R37 and one end of resistance R38, one end of anti-phase input terminating resistor R35, anti-phase defeated
Entering the other end ground connection of the indirect resistance R36, resistance R38 of end and outfan, the other end of resistance R37 is as the first feedback module
One input of 7, is designated as port M7_IN1, the other end of resistance R35 as another input of the first feedback module 7,
Being designated as port M7_IN2, the outfan of amplifier U6A, as the outfan of the first feedback module 7, is designated as port M7_OUT, connects output
The port F_IN of control module 5；
The structure of the second described feedback module 8 is: the inverting input of amplifier U7B and the indirect resistance R43 of outfan,
One end of inverting input also connecting resistance R39 and one end of resistance R42, the outfan of another termination amplifier U7A of resistance R42,
The inverting input of another termination amplifier U7A of resistance R39 and one end of resistance R41, the other end ground connection of resistance R41, amplifier
The inverting input of U7A and the indirect resistance R40 of outfan, the positive supply termination power VCC of amplifier U7A, negative supply termination electricity
Source VEE, the in-phase input end of amplifier U7B and the in-phase input end of amplifier U7A as two inputs of the second feedback module 8,
Being designated as port M8_IN1 and port M8_IN2 respectively, the outfan of amplifier U7B, as the outfan of the second feedback module 8, is designated as
Port M8_OUT, meets the port M2_IN2 of subtracter block 2；
The structure of described driver module 9 is: one end of resistance R44 is as the input of driver module 9, note
For the in-phase input end of another termination amplifier U8A of port M9_IN, resistance R44, the inverting input of amplifier U8A and outfan
Indirect resistance R45, the positive supply termination power VCC of amplifier U8A, negative supply termination power VEE, outfan connecting resistance R46's
One end, the inverting input of another termination amplifier U8B of resistance R46, one end of the in-phase input end connecting resistance R47 of amplifier U8B,
The other end ground connection of the indirect resistance R48 of inverting input and outfan, resistance R47, the outfan connecting resistance R49 of amplifier U8B
One end, resistance R49 another termination slide rheostat W2 one end, the other end and the end of slide wire of slide rheostat W2 connect jointly
The inverting input of amplifier U9A, the inverting input of amplifier U9A and the indirect resistance R51 of outfan, in-phase input end connecting resistance
One end of R50, the other end ground connection of resistance R50, the positive supply termination power VCC of amplifier U9A, negative supply termination power VEE, defeated
Going out 1 foot of termination 2 core interface JP5, the 2 foot ground connection of 2 core interface JP5, one end ground connection of resistance R52, the other end is designated as port
LED_OUT；
The structure of described front panel 10 includes: display selection 101, on and off switch 102, digital watch 103, upper limit current
104, lower current 105, output electric current 106, the upper limit arrange 107, lower limit arranges 108, output arranges 109 and electric current output 100；
Described display selects 101 to be a DPTT double-pole triple throw switch, and two groups of switches that it comprises are designated as switching SW1 and switch SW2 respectively,
The port M9_IN of the public termination driver module 9 of switch SW1, three selection ends connect current limliting respectively and arrange the port of module 4
M4_OUT2, port M4_OUT3 and the port M7_OUT of the first feedback module 7, described on and off switch 102 is whole device
Battery main switch, described digital watch 103 is the digital voltmeter of 4 half, and the both positive and negative polarity of its signal input part is respectively
Connect 1 foot and 2 feet of 2 core interface JP5 in driver module 9, described upper limit current 104, lower current 105 and output electricity
Stream 106 is three light emitting diodes, and their anode meets power supply VCC jointly, and negative electrode connects described display respectively and selects 101 to be wrapped
Three selection ends of the switch SW2 contained, the port LED_OUT of the public termination driver module 9 of switch SW2, described is upper
Limit arranges 107, lower limit arrange 108 and output to arrange 109 be the knob slide rheostat that three resistances are 20k Ω, respectively
The three core interface JP1 phases that 3 core interface JP2 in module 4, three core interface JP3 and electric current arrange in module 1 are set with current limliting
Even, connected mode is the two ends of each slide rheostat and is connected with 1 foot, 3 feet of each three core interfaces respectively, end of slide wire and 2 foot phases
Even, described electric current output 100 is a biphase interface, positive and negative phase respectively with 2 core interface JP4 in power output module 6
1 foot, 2 feet be connected.
Each element used in a kind of based on dual negative feedback control the bidirectional constant source apparatus of the present invention is preferably joined
Number is as follows: amplifier U1A, amplifier U1B～amplifier U9A are TLC2252；Zener diode D1 and Zener diode D2 is
2.5V；Slide rheostat W1, slide rheostat W2 are 10k Ω；Resistance R1, resistance R2, resistance R3, resistance R4 are 5.1k
Ω, resistance R5 are 20k Ω, and it is 15k Ω that resistance R6～resistance R10 is 10k Ω, resistance R11, and resistance R12 is 10k Ω, resistance
R13 is 10k Ω, and it is 10k Ω that resistance R14, resistance R15 are 50k Ω, resistance R16, and resistance R17 is 510k Ω, resistance R18, electricity
Resistance R19 is that 150k Ω, resistance R20～resistance R28 are 10k Ω, resistance R29, resistance R30 is 5.1k Ω, resistance R31,
Resistance R32 is 10k Ω, resistance R33, resistance R34 is 0.1k Ω, and resistance R35 is 5.1k Ω, and resistance R36 is 200k Ω, electricity
Resistance R37 is 5.1k Ω, and resistance R38 is 200k Ω, and resistance R39 is 20k Ω, and resistance R40, resistance R41 are 180k Ω, resistance
R42, resistance R43 are 180k Ω, resistance R44～resistance R48 and are 10k Ω, resistance R49 is 15k Ω, and resistance R50 is 10k
Ω, resistance R51 are 5.1k Ω, and resistance R52 is 10k Ω, and sample resistance Rs is 0.1 Ω；Electric capacity C1, electric capacity C2 are 1 μ F, electric capacity C3
For 22pF；Electric capacity C4～electric capacity C6 is 0.47 μ F；Diode D3, diode D4 are 1N4148；Darlington transistor Q1, Darlington
Pipe Q3 is TIP132, Darlington transistor Q2, Darlington transistor Q4 is TIP137；Power supply VCC is+16V DC source, power supply VEE
For-16V DC source.
A kind of bidirectional constant source apparatus based on dual negative feedback control of the present invention has a following beneficial effect:
1, the present invention uses dual negative feedback structure, is effectively increased the degree of stability of output electric current.
2, the present invention uses dual 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 have employed PID control process in the second feedback loop, makes circuit all can oneself under a lot of use occasions
Dynamic current stabilization.
4, the present invention has current limliting and arranges function, can pre-set the bound of output current value according to load characteristic,
Make to regulate at work output electric current not over cut-off current, further increase the safety of device.
5, second feedback module of the present invention uses double operational high input impedance formula subtractor to take output current value
Sample, can more effectively reduce the feedback circuit impact on output electric current than traditional subtractor structure.
6, the present invention can realize exporting the two-ways regulation of electric current, uses more convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation of the front panel 10 of the present invention.
Fig. 2 is the population structure block diagram of the present invention.
Fig. 3 is the schematic diagram that the electric current of the present invention arranges module 1.
Fig. 4 is the schematic diagram of the subtracter block 2 of the present invention.
Fig. 5 is the schematic diagram of the PID module 3 of the present invention.
Fig. 6 is the schematic diagram that the current limliting of the present invention arranges module 4.
Fig. 7 is the schematic diagram of the output control module 5 of the present invention.
Fig. 8 is the schematic diagram of the power output module 6 of the present invention.
Fig. 9 is the schematic diagram of first feedback module 7 of the present invention.
Figure 10 is the schematic diagram of second feedback module 8 of the present invention.
Figure 11 is the schematic diagram of the driver module 9 of the present invention.
Figure 12 is structure and the connection diagram that the display on front panel 10 of the present invention selects 101.
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 U9A are TLC2252；Zener diode D1 and Zener diode D2 is
2.5V；Slide rheostat W1, slide rheostat W2 are 10k Ω；Resistance R1, resistance R2, resistance R3, resistance R4 are 5.1k
Ω, resistance R5 are 20k Ω, and it is 15k Ω that resistance R6～resistance R10 is 10k Ω, resistance R11, and resistance R12 is 10k Ω, resistance
R13 is 10k Ω, and it is 10k Ω that resistance R14, resistance R15 are 50k Ω, resistance R16, and resistance R17 is 510k Ω, resistance R18, electricity
Resistance R19 is that 150k Ω, resistance R20～resistance R28 are 10k Ω, resistance R29, resistance R30 is 5.1k Ω, resistance R31,
Resistance R32 is 10k Ω, resistance R33, resistance R34 is 0.1k Ω, and resistance R35 is 5.1k Ω, and resistance R36 is 200k Ω, electricity
Resistance R37 is 5.1k Ω, and resistance R38 is 200k Ω, and resistance R39 is 20k Ω, and resistance R40, resistance R41 are 180k Ω, resistance
R42, resistance R43 are 180k Ω, resistance R44～resistance R48 and are 10k Ω, resistance R49 is 15k Ω, and resistance R50 is 10k
Ω, resistance R51 are 5.1k Ω, and resistance R52 is 10k Ω, and sample resistance Rs is 0.1 Ω；Electric capacity C1, electric capacity C2 are 1 μ F, electric capacity C3
For 22pF；Electric capacity C4～electric capacity C6 is 0.47 μ F；Diode D3, diode D4 are 1N4148；Darlington transistor Q1, Darlington
Pipe Q3 is TIP132, Darlington transistor Q2, Darlington transistor Q4 is TIP137；Power supply VCC is+16V DC source, power supply VEE
For-16V DC source.
The overall structure of embodiment 1 present invention
The overall work principle of a kind of bidirectional constant source circuit of the present invention is described in conjunction with Fig. 2.By electric current, module 1 is set
Arranging a reference voltage, the second feedback module 8 is to output current sampling and is converted to corresponding voltage, and above-mentioned two voltage exists
Carrying out in subtracter block 2 asking poor, difference delivers to carry out in PID module 3 PID arithmetic, and the result of computing is delivered to current limliting and arranged mould
Block 4, current limliting arranges the output valve of module 4 and delivers to the control input of output control module 5 as control voltage, with the first feedback
The feedback voltage of module 7 compares, and output valve controls power output module 6 and exports electric current, owing to whole system is in dual
Negative feedback duty, therefore, output electric current is changed arranging, in strict accordance with electric current, the reference voltage that module 1 arranges, and
Current limliting arranges higher limit that module 4 arranges and lower limit will determine the output maximum of electric current and minima.
The electric current of embodiment 2 present invention arranges module 1
The electric current of the present invention arranges the schematic circuit of module 1 as it is shown on figure 3, a termination power VCC of resistance R1, the other end
Connect negative electrode and 3 feet of 3 core interface JP1 of Zener diode D1, the plus earth of Zener diode D1, a termination electricity of resistance R2
Source VEE, the anode of another termination Zener diode D2 and 1 foot of 3 core interface JP1, the minus earth of Zener diode D2,3 cores
One end of the 2 foot connecting resistance R3 of interface JP1, the in-phase input end of another termination amplifier U1A of resistance R3, amplifier U1A anti-phase
One end of input connecting resistance R4 and one end of resistance R5, the other end ground connection of resistance R4, another termination amplifier U1A of resistance R5
Outfan, the positive supply termination power VCC of amplifier U1A, negative supply termination power VEE, the outfan of amplifier U1A is as electric current
The outfan of module 1 is set, is designated as port M1_OUT, meet the port M2_IN1 of subtracter block 2.
Zener diode D1 and Zener diode D2 provides the reference voltage of+2.5V and-2.5V, by 3 core interface JP1's
1,3 feet are added in the output of front panel and arrange 109 two ends, and it is a knob slide rheostat that output arranges 109, and its end of slide wire leads to
2 feet crossing three core interface JP1 connect a foot of resistance R3, and end of slide wire voltage will change in the range of+2.5V～-2.5V, this electricity
Pressure value after the in-phase proportion amplifier that amplifier U1A is constituted outfan (port M1_OUT) will obtain+12.5V～-
The output voltage of change in the range of 12.5V.
Embodiment 3 subtracter block 2
As shown in Figure 4, one end of resistance R6 is as subtracter block 2 for the schematic circuit of the subtracter block 2 of the present invention
One input, is designated as port M2_IN2, the other end of the anti-phase input terminating resistor R6 of amplifier U1B and one end of resistance R9,
The outfan of another termination amplifier U1B of resistance R9, one end of resistance R7 is as another input of subtracter block 2, note
For port M2_IN1, the other end of the in-phase input end connecting resistance R7 of amplifier U1B and one end of resistance R8, the other end of resistance R8
Ground connection, the outfan of amplifier U1B as the outfan of subtracter block 2, is designated as port M2_OUT, connects the port of PID module 3
M3_IN。
This subtracter block is the 1:1 times of subtractor exported, and output voltage is the electricity of port M2_IN1 and port M2_IN2
The difference of pressure.
Embodiment 4PID module 3
The schematic circuit of the PID module 3 of the present invention is as it is shown in figure 5, one end of resistance R10, one end of resistance R17 and resistance
One end of R14 is connected together, and as the input of PID module 3, another termination slip being designated as port M3_IN, resistance R10 becomes
Hindering one end of device W1, the other end of slide rheostat W1 and end of slide wire connect the inverting input of amplifier U2A jointly, amplifier U2A
One end ground connection of the indirect resistance R11 of inverting input and outfan, resistance R12, the homophase input of another termination amplifier U2A
End, the positive supply termination power VCC of amplifier U2A, negative supply termination power VEE, the one of the outfan connecting resistance R13 of amplifier U2A
End, the other end of the anti-phase input terminating resistor R14 of amplifier U2B and one end of electric capacity C1, another termination amplifier U2B of electric capacity C1
Outfan, one end ground connection of resistance R15, another termination amplifier U2B in-phase input end, the outfan connecting resistance of amplifier U2B
One end of R16, one end of another termination capacitor C2 of resistance R17, amplifier U3A anti-phase input termination electric capacity C2 the other end and
One end of resistance R18 and one end of electric capacity C3, the other end of electric capacity C3 and the outfan of another termination amplifier U3A of resistance R18,
One end ground connection of resistance R19, the in-phase input end of another termination amplifier U3A, the positive supply termination power VCC of amplifier U3A, negative electricity
Source termination power VEE, one end of the outfan connecting resistance R20 of amplifier U3A, the other end of resistance R13, the other end of resistance R16
The other end with resistance R20 connects the inverting input of amplifier U3B jointly, the anti-phase input of termination amplifier U3B of resistance R21
End, the outfan of another termination amplifier U3B, the in-phase input end of termination amplifier U3B of resistance R22, other end ground connection, amplifier
The outfan of U3B, as the outfan of PID module 3, is designated as port M3_OUT, connects current limliting and arranges the port M4_IN of module 4.
The difference voltage that subtracter block 2 is exported by this circuit carries out ratio, integration, differentiate after again output to current limliting
Module 4 is set.
Embodiment 5 current limliting arranges module 4
The current limliting of the present invention arranges the schematic circuit of module 4 as shown in Figure 6, a termination power VCC of resistance R29, another
Terminate 3 feet of 3 core interface JP2, the 1 foot ground connection of 3 core interface JP2, one end of 2 foot connecting resistance R24, and module is set as current limliting
Second outfan of 4, is designated as port M4_OUT2, the other end of the in-phase input end connecting resistance R24 of amplifier U4B, anti-phase input
End and the indirect resistance R23 of outfan, the negative electrode of output terminating diode D3, the anode of diode D3 connects the homophase of amplifier U5B
Input, a termination power VEE of resistance R30, another terminates 3 feet of 3 core interface JP3, the 1 foot ground connection of 3 core interface JP3,2 feet
One end of connecting resistance R26, and the 3rd outfan of module 4, the in-phase input end connecting resistance of amplifier U4A are set as current limliting
The indirect resistance R25 of the other end of R26, inverting input and outfan, the anode of output terminating diode D4, diode D4's
Negative electrode connects the in-phase input end of amplifier U5B, the positive supply termination power VCC of amplifier U4A, negative supply termination power VEE, amplifier
The in-phase input end of one termination amplifier U5B of the inverting input of U5B and the indirect resistance R28 of outfan, resistance R27, another
End arranges the input of module 4 as current limliting, is designated as port M4_IN, and the outfan of amplifier U5B arranges module 4 as current limliting
First outfan, is designated as port M4_OUT1, meets the port M5_IN of output control module 5.
Amplifier U4B and diode D3 constitute upper limiter, and its input voltage value is arranged 107 controls by the upper limit on front panel 10
System, amplifier U4A and diode D4 constitute lower limiter, and its input voltage value is arranged 108 controls by the lower limit on front panel 10, when
When being less than upper limit flow valuve from the voltage of port M4_IN input and be more than lower cut-off current, diode D3 and diode D4 full cut-off,
Upper and lower amplitude limiter is the most inoperative, the voltage that the voltage of port M4_OUT output will input equal to port M4_IN；As port M4_
When the voltage of IN input is more than upper limit flow valuve, diode D3 will turn on, and the voltage of port M4_OUT output will be equal to upper flow electricity
Pressure；When the voltage of port M4_IN input is less than lower cut-off current, diode D4 will turn on, and the voltage of port M4_OUT output will
Equal to lower limit voltage.By pre-setting bound flow valuve, can effectively prevent in operation owing to maloperation causes
Output electric current is excessive and the load that causes or the damage of circuit.
Embodiment 6 output control module 5
The schematic diagram of the output control module 5 of the present invention is as it is shown in fig. 7, the positive supply termination power VCC of amplifier U5A, negative
The indirect electric capacity C4 of power supply termination power VEE, inverting input and outfan, one end of output termination capacitor C5 and resistance R31
One end, the other end ground connection of electric capacity C5, resistance R31 another termination amplifier U6B inverting input, the homophase of amplifier U6B
The indirect resistance R32 of input end grounding, inverting input and outfan, one end of output termination capacitor C6, another of electric capacity C6
End ground connection, the in-phase input end of amplifier U5A, as the control input of output control module 5, is designated as port M5_IN, amplifier U5A
Inverting input as the feedback input end of output control module 5, be designated as port F_IN, the outfan of amplifier U5A is as defeated
Go out an outfan of control module 5, be designated as port M5_OUT1, meet the port M6_IN1 of power output module 6, amplifier U6B
Outfan, as another outfan of output control module 5, is designated as port M5_OUT2, connects the port of power output module 6
M6_IN2。
Amplifier U6B constitutes phase inverter with resistance R32 so that the voltage of port M5_OUT2 and port M5_OUT1 output is always
On the contrary, the voltage of the two port is respectively used to control the left side Darlington pair pipe in power output module 6 and right side Darlington
To pipe, when when port M5_OUT1 output positive voltage, port M5_OUT2 exports negative voltage, the Darlington transistor Q1 in left side and right side
Darlington transistor Q4 in the conduction state, output electric current will flow through load from left to right, on the contrary then Darlington transistor Q3 and Darlington
Pipe Q2 turns on, and output electric current will flow through load from right to left, thus realize the function of two-way output electric current.
Embodiment 7 power output module 6
As shown in Figure 8, one end of resistance R33 is defeated as of power output module 6 for the power output module 6 of the present invention
Entering end, be designated as port M6_IN1, one end of resistance R34, as another input of power output module 6, is designated as port M6_
IN2, the other end of resistance R33 connects base stage and the base stage of Darlington transistor Q2 of Darlington transistor Q1, and the colelctor electrode of Darlington transistor Q1 connects
Power supply VCC, emitter stage connects the emitter stage of Darlington transistor Q2, and the colelctor electrode of Darlington transistor Q2 connects another of power supply VEE, resistance R34
The base stage of termination Darlington transistor Q3 and the base stage of Darlington transistor Q4, the colelctor electrode of Darlington transistor Q3 meets power supply VCC, and emitter stage accesses
The emitter stage of Islington pipe Q4, the colelctor electrode of Darlington transistor Q4 meets power supply VEE, described Darlington transistor Q1 and Darlington transistor Q3 and is
NPN type, Darlington transistor Q2 and Darlington transistor Q4 is positive-negative-positive, and one end of sample resistance Rs connects the emitter stage of Darlington transistor Q1,
And as a feedback output end of power output module 6, it is designated as port M6_OUT1, meet the port M7_ of the first feedback module 7
Another of IN1 and the port M8_IN1 of the second feedback module 8, sample resistance Rs terminates 1 foot of 2 core interface JP4, and as power
Another feedback output end of output module 6, is designated as port M6_OUT2, meets the port M7_IN2 and second of the first feedback module 7
The emitter stage of the port M8_IN2 of feedback module 8, Darlington transistor Q3 and the emitter stage of Darlington transistor Q4 meet 2 core interface JP4 jointly
2 feet.
This module two-way can be outputed current to load by the control of output control module 5, and operation principle sees embodiment
6, the sample resistance Rs in this module are used to the electric current of convection current overload and are sampled and are converted to by output electric current voltage confession
First feedback module 7 and the second feedback module 8 use.
Embodiment 8 first feedback module 7
The schematic diagram of first feedback module 7 of the present invention is as it is shown in figure 9, the positive supply termination power VCC of amplifier U6A, negative
Power supply termination power VEE, one end of in-phase input end connecting resistance R37 and one end of resistance R38, anti-phase input terminating resistor R35
One end, the other end ground connection of the indirect resistance R36 of inverting input and outfan, resistance R38, the other end of resistance R37 is made
Being an input of the first feedback module 7, be designated as port M7_IN1, the other end of resistance R35 is as the first feedback module 7
Another input, is designated as port M7_IN2, and the outfan of amplifier U6A, as the outfan of the first feedback module 7, is designated as port
M7_OUT, meets the port F_IN of output control module 5.
This module controls mould by delivering to output after the voltage amplification 40 times at the sample resistance Rs two ends in power output module 6
The feedback input end of block 5, compares with the control voltage controlling input reception of output control module 5, during balance, both
Voltage is equal, thus realizes the function of voltage-controlled constant current.
Embodiment 9 second feedback module 8
The schematic diagram of second feedback module 8 of the present invention as shown in Figure 10, the inverting input of amplifier U7B and outfan it
Indirect resistance R43, one end of inverting input also connecting resistance R39 and one end of resistance R42, another termination amplifier of resistance R42
The outfan of U7A, another termination inverting input of amplifier U7A and one end of resistance R41 of resistance R39, another of resistance R41
End ground connection, the inverting input of amplifier U7A and the indirect resistance R40 of outfan, the positive supply termination power VCC of amplifier U7A, negative
Power supply termination power VEE, the in-phase input end of amplifier U7B and the in-phase input end of amplifier U7A are as the two of the second feedback module 8
Individual input, is designated as port M8_IN1 and port M8_IN2 respectively, and the outfan of amplifier U7B is defeated as the second feedback module 8
Go out end, be designated as port M8_OUT, meet the port M2_IN2 of subtracter block 2.
This module delivers to subtracter block after the voltage amplification 20 times at the sample resistance Rs two ends in power output module 6
2, the voltage that arranging module 1 with electric current provides carries out asking poor in subtractor.
Embodiment 10 driver module 9
As shown in figure 11, one end of resistance R44 is as driver module for the schematic diagram of the driver module 9 of the present invention
The input of 9, is designated as the in-phase input end of another termination amplifier U8A of port M9_IN, resistance R44, amplifier U8A anti-phase defeated
Enter the indirect resistance R45 of end and outfan, the positive supply termination power VCC of amplifier U8A, negative supply termination power VEE, outfan
One end of connecting resistance R46, the inverting input of another termination amplifier U8B of resistance R46, the in-phase input end of amplifier U8B connects electricity
One end of resistance R47, the other end ground connection of the indirect resistance R48 of inverting input and outfan, resistance R47, the output of amplifier U8B
One end of terminating resistor R49, resistance R49 another termination slide rheostat W2 one end, the other end of slide rheostat W2 and
End of slide wire connects the inverting input of amplifier U9A jointly, the inverting input of amplifier U9A and the indirect resistance R51 of outfan, homophase
One end of input connecting resistance R50, the other end ground connection of resistance R50, the positive supply termination power VCC of amplifier U9A, negative power end
Meet power supply VEE, 1 foot of output termination 2 core interface JP5, the 2 foot ground connection of 2 core interface JP5, one end ground connection of resistance R52, another
End is designated as port LED_OUT.
Port M9_IN selects the upper limit current that 101 selections are to be shown, lower current or defeated by the display on front panel 10
Go out electric current, by this module, current value is converted into after selecting the magnitude of voltage of correspondence, is delivered on front panel 10 by 2 core interface JP5
Digital watch 103 show.
Embodiment 11 front panel 10
The front panel 10 of the present invention is as it is shown in figure 1, structure includes: display selection 101, on and off switch 102, digital watch
103, upper limit current 104, lower current 105, output electric current 106, the upper limit arrange 107, lower limit arranges 108, output arranges 109 and
Electric current output 100；Described display selects 101 to be a DPTT double-pole triple throw switch, and its structure sees Figure 12, and its comprise two group is opened
Close and be designated as respectively switching SW1 and switch SW2, the port M9_IN of the public termination driver module 9 of switch SW1, three selections
End connects current limliting respectively and arranges the port M4_OUT2 of module 4, port M4_OUT3 and the port M7_OUT of the first feedback module 7, aobvious
Show that selection 101 will select a port M9_IN being connected to driver module 9 from these three port, be converted into and corresponding electricity
Being shown by digital watch 103 after the voltage of flow valuve numerically equal, described on and off switch 102 is that the power supply of whole device is total
Switch, described digital watch 103 is the digital voltmeter of 4 half, and the both positive and negative polarity of its signal input part connects display respectively
1 foot of 2 core interface JP5 in driving module 9 and 2 feet, described upper limit current 104, lower current 105 and output electric current 106
Being three light emitting diodes, their anode meets power supply VCC jointly, and negative electrode connects what described display selection 101 was comprised respectively
Three selection ends of switch SW2, the port LED_OUT of the public termination driver module 9 of switch SW2, when display selection 101
When selecting parameter to be shown by switch SW1, correspondingly switch SW2 then can by corresponding display lamp (light emitting diode) even
Logical, corresponding display lamp will light, the described upper limit arranges 107, lower limit arrange 108 and output to arrange 109 be that three resistances are equal
For the knob slide rheostat of 20k Ω, 3 core interface JP2 in module 4, three core interface JP3 and electricity are set with current limliting respectively
Stream arranges three core interface JP1 in module 1 and is connected, connected mode be the two ends of each slide rheostat respectively with each three core interfaces
1 foot, 3 feet be connected, end of slide wire and 2 feet are connected, and described electric current output 100 is a biphase interface, positive and negative phase respectively and
1 foot of 2 core interface JP4,2 feet in power output module 6 are connected, and when placing corresponding knob, change three are slided and become
The output voltage of resistance device, thus realize upper limit current, lower current and the setting of output electric current.
Claims (2)
1. a bidirectional constant source apparatus based on dual negative feedback control, structure has front panel (10), electric current to arrange module
(1), output control module (5), power output module (6) and the first feedback module (7)；It is characterized in that, structure also has subtraction
Device module (2), PID module (3), current limliting arrange module (4), the second feedback module (8) and driver module (9)；Electric current sets
Put the outfan of module (1) and the outfan of the second feedback module (8) is connected with the input of subtracter block (2), subtractor
The input of output termination PID module (3) of module (2), the output termination current limliting of PID module (3) arranges the input of module (4)
End, current limliting arranges the control input of output termination output control module (5) of module (4), the first feedback module (7)
The feedback input end of output termination output control module (5), output termination power output module (6) of output control module (5)
Input, the feedback output end of power output module (6) connects the input of the first feedback module (7) and the second feedback mould simultaneously
The input of block (8), the outfan of another two outfan and the first feedback module (7) that current limliting arranges module (4) connects out respectively
Close three selection ends of SW1, switch the input of the public termination driver module (9) of SW1, driver module (9)
Outfan connects the signal input part of digital voltage gauge outfit (103) on front panel (10) by two core interface JP5；
Described electric current arranges the structure of module (1): a termination power VCC of resistance R1, and another terminates Zener diode D1
Negative electrode and 3 feet of 3 core interface JP1, the plus earth of Zener diode D1, a termination power VEE of resistance R2, another termination
The anode of Zener diode D2 and 1 foot of 3 core interface JP1, the minus earth of Zener diode D2,2 feet of 3 core interface JP1 connect
One end of resistance R3, the in-phase input end of another termination amplifier U1A of resistance R3, the anti-phase input terminating resistor R4 of amplifier U1A
One end and one end of resistance R5, the other end ground connection of resistance R4, resistance R5 another termination amplifier U1A outfan, amplifier
The positive supply termination power VCC of U1A, negative supply termination power VEE, the outfan of amplifier U1A arranges module (1) as electric current
Outfan, is designated as port M1_OUT, meets the port M2_IN1 of subtracter block (2)；
The structure of described subtracter block (2) is: one end of resistance R6 is as an input of subtracter block (2), note
For port M2_IN2, the other end of the anti-phase input terminating resistor R6 of amplifier U1B and one end of resistance R9, the other end of resistance R9
Connecing the outfan of amplifier U1B, one end of resistance R7, as another input of subtracter block (2), is designated as port M2_IN1,
The other end of the in-phase input end connecting resistance R7 of amplifier U1B and one end of resistance R8, the other end ground connection of resistance R8, amplifier U1B
Outfan as the outfan of subtracter block (2), be designated as port M2_OUT, meet the port M3_IN of PID module (3)；
The structure of described PID module (3) is: an end of one end of resistance R10, one end of resistance R17 and resistance R14 is connected on one
Rise, as the input of PID module (3), be designated as one end of another termination slide rheostat W1 of port M3_IN, resistance R10,
The other end of slide rheostat W1 and end of slide wire connect the inverting input of amplifier U2A jointly, the inverting input of amplifier U2A and defeated
Go out the indirect resistance R11 of end, one end ground connection of resistance R12, the in-phase input end of another termination amplifier U2A, the positive electricity of amplifier U2A
Source termination power VCC, negative supply termination power VEE, one end of the outfan connecting resistance R13 of amplifier U2A, amplifier U2B anti-phase
The other end of input connecting resistance R14 and one end of electric capacity C1, the outfan of another termination amplifier U2B of electric capacity C1, resistance R15
One end ground connection, another termination amplifier U2B in-phase input end, one end of the outfan connecting resistance R16 of amplifier U2B, resistance R17
One end of another termination capacitor C2, the other end of the anti-phase input termination electric capacity C2 of amplifier U3A and one end of resistance R18 and electricity
Hold one end of C3, the other end of electric capacity C3 and the outfan of another termination amplifier U3A of resistance R18, a termination of resistance R19
Ground, the in-phase input end of another termination amplifier U3A, the positive supply termination power VCC of amplifier U3A, negative supply termination power VEE,
One end of the outfan connecting resistance R20 of amplifier U3A, another of the other end of resistance R13, the other end of resistance R16 and resistance R20
End connects the inverting input of amplifier U3B jointly, and the inverting input of termination amplifier U3B of resistance R21, another terminates amplifier
The outfan of U3B, the in-phase input end of termination amplifier U3B of resistance R22, other end ground connection, the outfan conduct of amplifier U3B
The outfan of PID module (3), is designated as port M3_OUT, connects current limliting and arranges the port M4_IN of module (4)；
Described current limliting arranges the structure of module (4): a termination power VCC of resistance R29, and another terminates 3 core interface JP2's
3 feet, the 1 foot ground connection of 3 core interface JP2, one end of 2 foot connecting resistance R24, and second output of module (4) is set as current limliting
End, is designated as port M4_OUT2, the other end of the in-phase input end connecting resistance R24 of amplifier U4B, inverting input and outfan it
Indirect resistance R23, the negative electrode of output terminating diode D3, the anode of diode D3 connects the in-phase input end of amplifier U5B, resistance
The one termination power VEE of R30, another terminates 3 feet of 3 core interface JP3, the 1 foot ground connection of 3 core interface JP3,2 foot connecting resistance R26's
One end, and the 3rd outfan of module (4) is set as current limliting, it is designated as port M4_OUT3, the in-phase input end of amplifier U4A
The indirect resistance R25 of the other end of connecting resistance R26, inverting input and outfan, the anode of output terminating diode D4, two poles
The negative electrode of pipe D4 connects the in-phase input end of amplifier U5B, the positive supply termination power VCC of amplifier U4A, negative supply termination power VEE,
The in-phase input end of one termination amplifier U5B of the inverting input of amplifier U5B and the indirect resistance R28 of outfan, resistance R27,
The other end arranges the input of module (4) as current limliting, is designated as port M4_IN, and the outfan of amplifier U5B arranges mould as current limliting
First outfan of block (4), is designated as port M4_OUT1, meets the port M5_IN of output control module (5)；
The structure of described output control module (5) is: the positive supply termination power VCC of amplifier U5A, negative supply termination power
The indirect electric capacity C4 of VEE, inverting input and outfan, one end of output termination capacitor C5 and one end of resistance R31, electric capacity C5
Other end ground connection, resistance R31 another termination amplifier U6B inverting input, the in-phase input end ground connection of amplifier U6B, instead
The indirect resistance R32 of phase input and outfan, one end of output termination capacitor C6, the other end ground connection of electric capacity C6, amplifier U5A
In-phase input end as the control input of output control module (5), be designated as port M5_IN, the inverting input of amplifier U5A
As the feedback input end of output control module (5), being designated as port F_IN, the outfan of amplifier U5A is as output control module
(5) a outfan, is designated as port M5_OUT1, connects the port M6_IN1 of power output module (6), the outfan of amplifier U6B
As another outfan of output control module (5), it is designated as port M5_OUT2, meets the port M6_ of power output module (6)
IN2；
The structure of described power output module (6) is: one end of resistance R33 is as an input of power output module (6)
End, is designated as port M6_IN1, and one end of resistance R34, as another input of power output module (6), is designated as port M6_
IN2, the other end of resistance R33 connects base stage and the base stage of Darlington transistor Q2 of Darlington transistor Q1, and the colelctor electrode of Darlington transistor Q1 connects
Power supply VCC, emitter stage connects the emitter stage of Darlington transistor Q2, and the colelctor electrode of Darlington transistor Q2 connects another of power supply VEE, resistance R34
The base stage of termination Darlington transistor Q3 and the base stage of Darlington transistor Q4, the colelctor electrode of Darlington transistor Q3 meets power supply VCC, and emitter stage accesses
The emitter stage of Islington pipe Q4, the colelctor electrode of Darlington transistor Q4 meets power supply VEE, described Darlington transistor Q1 and Darlington transistor Q3 and is
NPN type, Darlington transistor Q2 and Darlington transistor Q4 is positive-negative-positive, and one end of sample resistance Rs connects the emitter stage of Darlington transistor Q1,
And as a feedback output end of power output module (6), be designated as port M6_OUT1, connect the port of the first feedback module (7)
Another of M7_IN1 and the port M8_IN1 of the second feedback module (8), sample resistance Rs terminates 1 foot of 2 core interface JP4, and makees
For another feedback output end of power output module (6), it is designated as port M6_OUT2, connects the port of the first feedback module (7)
M7_IN2 and the port M8_IN2 of the second feedback module (8), the emitter stage of Darlington transistor Q3 and the emitter stage of Darlington transistor Q4 are altogether
With 2 feet meeting 2 core interface JP4；
The structure of described the first feedback module (7) is: the positive supply termination power VCC of amplifier U6A, negative supply termination power
VEE, one end of in-phase input end connecting resistance R37 and one end of resistance R38, one end of anti-phase input terminating resistor R35, anti-phase defeated
Entering the other end ground connection of the indirect resistance R36, resistance R38 of end and outfan, the other end of resistance R37 is as the first feedback module
(7) a input, is designated as port M7_IN1, and the other end of resistance R35 is as another input of the first feedback module (7)
End, is designated as port M7_IN2, and the outfan of amplifier U6A, as the outfan of the first feedback module (7), is designated as port M7_OUT,
Meet the port F_IN of output control module (5)；
The structure of described the second feedback module (8) is: the inverting input of amplifier U7B and the indirect resistance R43 of outfan, instead
One end of phase input also connecting resistance R39 and one end of resistance R42, the outfan of another termination amplifier U7A of resistance R42, electricity
The inverting input of another termination amplifier U7A of resistance R39 and one end of resistance R41, the other end ground connection of resistance R41, amplifier U7A
Inverting input and the indirect resistance R40 of outfan, the positive supply termination power VCC of amplifier U7A, negative supply termination power
VEE, the in-phase input end of amplifier U7B and the in-phase input end of amplifier U7A as two inputs of the second feedback module (8),
Being designated as port M8_IN1 and port M8_IN2 respectively, the outfan of amplifier U7B is as the outfan of the second feedback module (8), note
For port M8_OUT, meet the port M2_IN2 of subtracter block (2)；
The structure of described driver module (9) is: one end of resistance R44 is as the input of driver module (9), note
For the in-phase input end of another termination amplifier U8A of port M9_IN, resistance R44, the inverting input of amplifier U8A and outfan
Indirect resistance R45, the positive supply termination power VCC of amplifier U8A, negative supply termination power VEE, outfan connecting resistance R46's
One end, the inverting input of another termination amplifier U8B of resistance R46, one end of the in-phase input end connecting resistance R47 of amplifier U8B,
The other end ground connection of the indirect resistance R48 of inverting input and outfan, resistance R47, the outfan connecting resistance R49 of amplifier U8B
One end, resistance R49 another termination slide rheostat W2 one end, the other end and the end of slide wire of slide rheostat W2 connect jointly
The inverting input of amplifier U9A, the inverting input of amplifier U9A and the indirect resistance R51 of outfan, in-phase input end connecting resistance
One end of R50, the other end ground connection of resistance R50, the positive supply termination power VCC of amplifier U9A, negative supply termination power VEE, defeated
Going out 1 foot of termination 2 core interface JP5, the 2 foot ground connection of 2 core interface JP5, one end ground connection of resistance R52, the other end is designated as port
LED_OUT；
The structure of described front panel (10) including: display selects (101), on and off switch (102), digital watch (103), the upper limit
Electric current (104), lower current (105), output electric current (106), the upper limit arrange (107), lower limit setting (108), output setting
(109) and electric current output (100)；Described display selects (101) to be a DPTT double-pole triple throw switch, two groups of switches point that it comprises
Not being designated as switching SW1 and switch SW2, the port M9_IN of the public termination driver module (9) of switch SW1, three select end
Connect current limliting respectively and the port M4_OUT2 of module (4), port M4_OUT3 and the port M7_OUT of the first feedback module (7) be set,
Described on and off switch (102) is the battery main switch of whole device, and described digital watch (103) is the number of 4 half
Word voltmeter, the both positive and negative polarity of its signal input part meets 1 foot and 2 feet, the institute of 2 core interface JP5 in driver module (9) respectively
Upper limit current (104), lower current (105) and output electric current (106) stated are three light emitting diodes, and their anode is common
Meeting power supply VCC, negative electrode connects three selection ends of the switch SW2 that described display selects (101) to be comprised respectively, switch SW2's
The port LED_OUT of public termination driver module (9), the described upper limit arranges (107), lower limit arranges (108) and output
Arranging (109) is the knob slide rheostat that three resistances are 20k Ω, and 3 cores arranged with current limliting in module (4) respectively connect
Mouth JP2, three core interface JP3 and electric current arrange three core interface JP1 in module (1) and are connected, and connected mode is each slip and becomes
The two ends of resistance device are connected with 1 foot, 3 feet of each three core interfaces respectively, and end of slide wire and 2 feet are connected, and described electric current output (100) is
One biphase interface, positive and negative phase is connected with 1 foot of 2 core interface JP4 in power output module (6), 2 feet respectively.
A kind of bidirectional constant source apparatus based on dual negative feedback control the most according to claim 1, it is characterised in that each
Component parameters used in module is: amplifier U1A and amplifier U1B be model be the two of the integrated double operational of TLC2252
Individual working cell, amplifier U2A and amplifier U2B be second model be two working cells of the integrated double operational of TLC2252, fortune
Put U3A and amplifier U3B be the 3rd model be two working cells of the integrated double operational of TLC2252, amplifier U4A and amplifier
U4B be the 4th model be two working cells of the integrated double operational of TLC2252, amplifier U5A and amplifier U5B are the 5th types
Number be two working cells of the integrated double operational of TLC2252, amplifier U6A and amplifier U6B be the 6th model be TLC2252
Two working cells of integrated double operational, amplifier U7A and amplifier U7B be the 7th model be the integrated double operational of TLC2252
Two working cells, amplifier U8A and amplifier U8B are the as two job notes of the integrated double operational that a model is TLC2252
Unit, amplifier U9A be the 9th model be a working cell of the integrated double operational of TLC2252；Zener diode D1 and voltage stabilizing
Diode D2 is 2.5V；Slide rheostat W1, slide rheostat W2 are 10k Ω；Resistance R1, resistance R2, resistance R3, resistance
It is 20k Ω that R4 is 5.1k Ω, resistance R5, and it is 15k Ω that resistance R6～resistance R10 is 10k Ω, resistance R11, and resistance R12 is
10k Ω, resistance R13 are 10k Ω, and it is 10k Ω that resistance R14, resistance R15 are 50k Ω, resistance R16, and resistance R17 is 510k Ω,
Resistance R18, resistance R19 are that 150k Ω, resistance R20～resistance R28 are 10k Ω, resistance R29, resistance R30 is 5.1k
Ω, resistance R31, resistance R32 are 10k Ω, resistance R33, resistance R34 is 0.1k Ω, and resistance R35 is 5.1k Ω, resistance R36
Being 5.1k Ω for 200k Ω, resistance R37, resistance R38 is 200k Ω, and resistance R39 is 20k Ω, and resistance R40, resistance R41 are
180k Ω, resistance R42, resistance R43 are 180k Ω, resistance R44～resistance R48 and are 10k Ω, resistance R49 is 15k Ω, electricity
Resistance R50 is 10k Ω, and resistance R51 is 5.1k Ω, and resistance R52 is 10k Ω, and sample resistance Rs is 0.1 Ω；Electric capacity C1, electric capacity C2 are
1 μ F, electric capacity C3 are 22pF；Electric capacity C4～electric capacity C6 is 0.47 μ F；Diode D3, diode D4 are 1N4148；Darlington
Pipe Q1, Darlington transistor Q3 are TIP132, Darlington transistor Q2, Darlington transistor Q4 is TIP137；Power supply VCC is+16V unidirectional current
Source, power supply VEE is-16V DC source.
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