CN107272805B - Digital Control Direct Current Source - Google Patents
Digital Control Direct Current Source Download PDFInfo
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- CN107272805B CN107272805B CN201710623620.4A CN201710623620A CN107272805B CN 107272805 B CN107272805 B CN 107272805B CN 201710623620 A CN201710623620 A CN 201710623620A CN 107272805 B CN107272805 B CN 107272805B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Voltage And Current In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
Present disclose provides a kind of Digital Control Direct Current Sources, including：Host computer, output are connected with the input of control module；D/A conversion module, input are connected with control module output, and output is connected with the input of current generating module；The output of current generating module is connected with load, and input is connected with control module and the output of D/A conversion module, for generating required output electric current；The output of control module is connected with D/A conversion module, current generating module, input is connected to host computer, for receiving the instruction of host computer sending, handled and generated the control signal of D/A control module and current generating module, the D/A control module and current generating module are controlled accordingly, generate required output electric current.The Digital Control Direct Current Source of the disclosure can export on a large scale DC current according to output size of current adjust automatically appropriate gain, make operational amplifier work in stable region.
Description
Technical field
This disclosure relates to DC power supply field more particularly to a kind of numerically-controlled precise DC current source.
Background technique
In electronic circuit measurement especially chip measurement, need for DC current signal to be added to straight to its in system under test (SUT)
Stream parameter is tested.With the development of modernization science and technology, the requirement to high precision instrument instrument is also more next in these tests
It is higher.In traditional DC current source, it is generally existing it is bulky, adjust it is complicated, accurate in a wide range of cannot adjust etc.
Disadvantage.Such as：There is using control digit-control resistance network the Traditional DC current source for changing output size of current.Due to resistor network
Variation between two grades is bigger, and resulting in output current value in this way cannot be accurately controlled very much, especially in some small electrics
It is even more bad in the range of stream (the even more small magnitude of such as Naan) to be accurately controlled output valve；Also by current regulator diode or perseverance
The reference constant current that the DC current source that stream triode is constituted is able to achieve is smaller, and application range is narrow.
Disclosure
(1) technical problems to be solved
Present disclose provides a kind of numerically-controlled precise DC current sources, are asked with the technology at least partly solving set forth above
Topic.
(2) technical solution
According to one aspect of the disclosure, a kind of Digital Control Direct Current Source is provided, including：Host computer, output and control
The input of module is connected；D/A conversion module, input are connected with control module output, the input of output and current generating module
It is connected；The output of current generating module is connected with load, and input is connected with control module and the output of D/A conversion module, is used for
Output electric current needed for generating；The output of control module is connected with D/A conversion module, current generating module, and input is connected to
Position machine is handled and is generated the control letter of D/A control module and current generating module for receiving the instruction of host computer sending
Number, the D/A control module and current generating module are controlled accordingly, generate required output electric current.
In some embodiments of the disclosure, the current generating module includes：Power amplifier module, input terminal are connected to D/
The output end of A conversion module and sampling module, what voltage signal and sampling module for receiving the generation of D/A conversion module generated
Sampled signal, output are connected to the input terminal of measurement range selection module and sampling module, for passing the resulting voltage signal of operation
Give range selecting module and sampling module；Measurement range selection module, control signal is connected to control module output end, for connecing
The control signal that control module generates is received, while measurement range selection module input is also connect with power amplifier module, receives its fortune
Resulting voltage signal is calculated, the output end of measurement range selection module is connected to load and sampling module, passes through range conversion and output
Current sample feedback, electric current required for exporting；Sampling module, control signal is connected to control module output end, for connecing
The control signal that control module generates is received, while the output end of the first input end of sampling module and power amplifier connects, second
Input terminal is connect with the output end of measurement range selection module, for sampling the voltage difference at range selecting module both ends, while by operation
Voltage value out, which exports, gives power amplifier module, forms feedback network.
In some embodiments of the disclosure, in the current generating module, power amplifier module include power amplifier device,
Resistance R1 and R2, the output end of D/A conversion module are connected to the first end of resistance R1, and the second end of resistance R1 is connected to resistance R2
First end and power amplifier device first input end, the second input end grounding of power amplifier device, power amplifier device
Output end be connected with the first input end of measurement range selection module input and sampling module, resistance R2 second end and sampling module
Output end be connected；Measurement range selection module includes the sampling resistor branch of multiple parallel connections, and one end connects power amplifier device
Output end, the other end connect the second input terminal of sampling module, in the branch of each parallel connection sampling resistor both ends be respectively set after
Electric switch；Sampling module includes 5 operational amplifiers, and wherein the input terminal of amplifier A1 is connected to the defeated of power amplifier device
Outlet, output end are connected to the input terminal of amplifier A3, and the input terminal of amplifier A2 is connected to the output end of measurement range selection module,
The output end of amplifier A2 is connected to the input terminal of amplifier A3, and the output end of amplifier A3 is connected to the first end of switch Km1,
The switch Km1 first via is directly connected to the resistance R2 second end of power amplifier module, and the second tunnel switch Km1 passes through concatenated amplification
Device A4, A5 and switch Km2 are connected to the resistance R2 second end of power amplifier module.
In some embodiments of the disclosure, host computer by control module send the opening of power supply, close, range selects
The instruction for selecting, exporting size of current controls Digital Control Direct Current Source.
In some embodiments of the disclosure, control module includes programmable logic device and host computer interface circuit, is passed through
The instruction issued to received host computer decodes, in the control sequential and current generating module for generating D/A conversion module
Switch control signal makes D/A conversion module and current generating module cooperate, generates required output electric current.
In some embodiments of the disclosure, the D/A conversion module includes D/A converter and D/A reference voltage generator
And its peripheral circuit.
In some embodiments of the disclosure, the Digital Control Direct Current Source further includes：External power supply module, with control mould
Block, D/A conversion module, current generating module are connected, and are the control module, D/A conversion module, current generating module power supply.
In some embodiments of the disclosure, wherein current generating module can be configured to greatly according to the control signal of control module
Current generating module and low current generation module.
In some embodiments of the disclosure, the output of host computer is connected with the input of control module, in control module reception
The instruction of position machine, is converted to control logic, control the D/A conversion module being connected with control module output end, measurement range selection module,
Sampling module；D/A conversion module receives the control logic of control module, exports corresponding voltage signal Vin and gives power amplifier mould
The first input end of block, the output voltage of power amplifier module are denoted as Vr, and the output voltage of measurement range selection module is denoted as Vo, output
Electric current is the output electric current Io of current source, and the output voltage of sampling module is denoted as V4, and in power amplifier module, Vin and V4 divide
Not Tong Guo resistance R1, R2 be connected with power amplifier, wherein R1=R2, the second input end grounding of power amplifier, Vin=- at this time
V4；In measurement range selection module, a shared n/2 range, n=2,4,6..., measurement range selection module is according to the control received
Signal is closed the switch at the both ends sampling resistor Rs, at this time Vr-Vo=Io × Rs.
In some embodiments of the disclosure, when current generating module is configured to high current generation module, in sampling module
In, the conducting of the end A, B of switch Km1, Km2 closure, amplifier A4, A5 do not access circuit, Vr and Vo pass through respectively gain be-| G1 |
Amplifier A1 and gain be | G1 | amplifier A2 and gain be-| G2 | amplifier A3 be connected, the input of amplifier A3 is electric
Pressure is V1, and the output voltage V2 of amplifier A3 is exactly the output voltage V4, V4=- of sampling module at this time | G2 | V1；V1=- | G1 |
Vr+|G1|Vo；Can obtain output size of current is：It is configured in current generating module
When low current generation module, in sampling module, the A of switch Km1, C-terminal conducting, Km2 closure, Vr and Vo pass through gain respectively
For-| G1 | the A1 of amplifier and gain be | G1 | amplifier A2 with gain be-| G2 | amplifier A3 be connected, amplifier A4 with
The gain of A5 be respectively-| G3 | and-| G4 |, the input voltage of amplifier A3 is V1, the output voltage of amplifier A3 be V2, amplification
The output voltage of device A4 is V3, the output voltage of amplifier A5 is V4, V4=- | G4 | V3, V3=- | and G3 | V2, V2=- | G2 |
V1, V1=- | G1 | Vr+ | G1 | Vo；Can obtain output size of current is：
(3) beneficial effect
It can be seen from the above technical proposal that the disclosure at least has the advantages that one of them：
(1) control module being made up of programmable logic device can be according to output size of current adjust automatically sampling module
To appropriate gain, DC current (from several pico-amperes to several amperes) can be exported on a large scale, make operational amplifier work in stable area
Domain；
(2) the range choosing constituted due to using programmable logic device, D/A conversion module and high precision sampling resistance
Module is selected, equally accurate adjusting is carried out in gamut, realizes that size of current adjusts digitlization；Programmable logic device is as needed
The size of electric current is exported, switch on and off in flexible switch sampling module makes the amplifier number for participating in operation in sampling module can
It is increased and decreased according to size of current, so that holding circuit is stablized；
(3) due to using programmable logic device and D/A conversion module, the voltage for being input to power amplifier module can be just
It can bear, therefore bidirectional current can be exported；
(4) component for being used to use is easy to use to be easy to buy, and the current source of realization is small in size, output area is wide, essence
Degree is high and easily controllable, is with a wide range of applications.
Detailed description of the invention
Fig. 1 is embodiment of the present disclosure numerically-controlled precise DC current source block diagram.
Fig. 2 is embodiment of the present disclosure current generating module functional block diagram.
Fig. 3 is embodiment of the present disclosure numerically-controlled precise DC current source high current generation module circuit diagram.
Fig. 4 is embodiment of the present disclosure numerically-controlled precise DC current source low current generation module circuit diagram.
Specific embodiment
For the purposes, technical schemes and advantages of the disclosure are more clearly understood, below in conjunction with specific embodiment, and reference
The disclosure is further described in attached drawing.
Disclosure some embodiments will be done referring to appended attached drawing in rear and more comprehensively describe to property, some of but not complete
The embodiment in portion will be shown.In fact, the various embodiments of the disclosure can be realized in many different forms, and should not be construed
To be limited to this several illustrated embodiment；Relatively, these embodiments are provided so that the disclosure meets applicable legal requirement.
In first exemplary embodiment of the disclosure, a kind of numerically-controlled precise DC current source is provided.Fig. 1 is this public affairs
Open first embodiment numerically-controlled precise DC current source block diagram.As shown in Figure 1, disclosure numerically-controlled precise DC current source includes：On
Totally six parts form for position machine, control module, D/A conversion module, current generating module, external power supply module, load.Host computer
Output be connected with the input of control module；The output of control module is connected with D/A conversion module, current generating module, control
Module receives the instruction that host computer issues, and is converted to the control signal of D/A control module and current generating module, and to the two
Module is controlled accordingly；The output of D/A conversion module is connected with the input of current generating module；Current generating module it is defeated
It is connected out with load, provides required electric current for load；External power supply module and control module, D/A conversion module, electric current generate
Module is connected, and is these three module for power supply.
Each component part of the present embodiment numerically-controlled precise DC current source is described in detail individually below.
Host computer output is connected to control module, for control module send the opening of power supply, close, measurement range selection,
The instructions such as output size of current control numerical control precision DC current source；
Control module includes programmable logic device and host computer interface circuit etc., and the output of control module is connected to D/A
Conversion module and current generating module generate D/A modulus of conversion for receiving the instruction of host computer sending and decoding to instruction
Switch control signal in the control sequential and current generating module of block makes D/A conversion module cooperate with work with current generating module
Make, generates required output electric current.
D/A conversion module includes D/A converter and D/A reference voltage generator and its peripheral circuit, and output is connected to
Current generating module, for providing the voltage needed for electric current generates for current generating module.
Current generating module includes that power amplifier module, measurement range selection module and sampling module form, for needed for generating
Output electric current.Fig. 2 is embodiment of the present disclosure current generating module functional block diagram, as shown in Fig. 2, power in current generating module
Amplifier module input is connected to the output end of D/A conversion module and sampling module, for receiving the electricity of D/A conversion module generation
The sampled signal for pressing signal and sampling module to generate, output are connected to the input terminal of measurement range selection module and sampling module, are used for
Send the resulting voltage signal of operation to measurement range selection module and sampling module；The control of measurement range selection module and sampling module
Input terminal is connected to control module output end, for receiving the control signal of control module generation, the output of measurement range selection module
End is connected to load and sampling module, by range conversion and output current sample feedback, electric current required for exporting.
Power amplifier module input is connected to the output end of D/A conversion module and sampling module, for receiving D/A conversion
The sampled signal that the voltage signal and sampling module that module generates generate, output are connected to measurement range selection module and sampling module
Input terminal, for sending the resulting voltage signal of operation to measurement range selection module and sampling module.Power amplifier module includes
Power amplifier device and peripheral circuit.Preferably, peripheral circuit includes resistance R1 and R2, and the output end of D/A conversion module connects
It is connected to the first end of resistance R1, the second end of resistance R1 is connected to the first end of resistance R2 and the first input of power amplifier device
End, the second input end grounding of power amplifier device, the output end of power amplifier device and the input terminal of measurement range selection module and
The first input end of sampling module is connected, and resistance R2 second end is connected with the output end of sampling module.
The control signal of measurement range selection module is connected to control module output end, for receiving the control of control module generation
Signal processed, while measurement range selection module is also connect with power amplifier module, receives the resulting voltage signal of its operation, measurement range selection
The output end of module is connected to load and sampling module, by range conversion and output current sample feedback, required for output
Electric current.Measurement range selection module includes relay network and precision resistance network.Preferably, the measurement range selection module includes multiple
Sampling resistor in parallel, one end connect the output end of power amplifier device, and the other end connects the second input terminal of sampling module,
Relay switch is respectively set in sampling resistor both ends in the branch of each parallel connection.
The control signal of sampling module is connected to control module output end, for receiving the control letter of control module generation
Number, while the first input end of sampling module is connect with the output end of power amplifier module, the second input terminal and measurement range selection mould
The output end of block connects, and exports for sampling the voltage difference at range selecting module both ends, while by the voltage value calculated to function
Rate amplifier module forms feedback network.It includes multiple operational amplifiers and its peripheral circuit.Preferably, the operation amplifier
Device quantity is 5, and wherein the input terminal of amplifier A1 is connected to the output end of power amplifier device, and output end is connected to amplifier
The input terminal of A3, the input terminal of amplifier A2 are connected to the output end of measurement range selection module, and the output end of amplifier A2 is connected to
The input terminal of amplifier A3, the output end of amplifier A3 are connected to the first end of switch Km1, and the switch Km1 first via is directly connected to
To the resistance R2 second end of power amplifier module, the second tunnel switch Km1 passes through concatenated amplifier A4, A5 and switch Km2 connection
To the resistance R2 second end of power amplifier module.
Fig. 3 is embodiment of the present disclosure Digital Control Direct Current Source high current generation module circuit diagram.As shown in figure 3, host computer
Output be connected with the input of control module, control module receives the instruction of host computer, is converted to control logic, control and control
The connected D/A conversion module of module output end, measurement range selection module, sampling module.The output end and power of D/A conversion module are transported
The first input end of amplification module is connected, and D/A conversion module receives the control logic of control module, exports corresponding voltage signal
First input end of the Vin to power amplifier module.It the input terminal of the output end of power amplifier module and measurement range selection module and adopts
The first input end of egf block is connected, and the output voltage of power amplifier module is denoted as Vr.The output end of measurement range selection module with adopt
Second input terminal of egf block is connected with the input terminal of load, and the output voltage of measurement range selection module is denoted as Vo, and output electric current is
The output electric current Io of current source.The output end of sampling module is connected with the second input terminal of power amplifier module, sampling module
Output voltage is denoted as V4.In power amplifier module, Vin passes through resistance R1, R2 with V4 respectively and is connected with power amplifier, wherein R1
=R2, the second input end grounding of power amplifier, at this time Vin=-V4.In measurement range selection module, a shared n/2 (n=2,4,
6...) a range, measurement range selection module are closed the switch at the both ends sampling resistor Rs according to the control signal received, this
When Vr-Vo=Io × Rs.In sampling module, the end A, B conducting of switch Km1, Km2 closure, amplifier A4, A5 do not access electricity
Road, Vr and Vo pass through amplifier A1 (gain is-| G1 |) and amplifier A2 (gain be | G1 |) and amplifier A3 (gain respectively
For-| G2 |) it is connected, the input voltage of amplifier A3 is V1, and the output voltage V2 of amplifier A3 is exactly the defeated of sampling module at this time
Voltage V4 out, V4=- | G2 | V1；V1=- | G1 | Vr+ | G1 | Vo.Can obtain output size of current is：
Fig. 4 is embodiment of the present disclosure numerically-controlled precise DC current source high current generation module circuit diagram.On as shown in figure 4,
The output of position machine is connected with the input of control module, and control module receives the instruction of host computer, is converted to control logic, control and
The connected D/A conversion module of control module output end, measurement range selection module, sampling module.The output end and function of D/A conversion module
The first input end of rate amplifier module is connected, and D/A conversion module receives the control logic of control module, exports corresponding voltage letter
The first input end of number Vin to power amplifier module.The output end of power amplifier module and the input terminal of measurement range selection module and
The first input end of sampling module is connected, and the output voltage of power amplifier module is denoted as Vr.The output end of measurement range selection module with
Second input terminal of sampling module is connected with the input terminal of load, and the output voltage of measurement range selection module is denoted as Vo, exports electric current
For the output electric current Io of current source.The output end of sampling module is connected with the second input terminal of power amplifier module, sampling module
Output voltage be denoted as V4.In power amplifier module, Vin passes through resistance R1, R2 with V4 respectively and is connected with power amplifier, wherein
R1=R2, the second input end grounding of power amplifier, at this time Vin=-V4.In measurement range selection module, a shared n/2 (n=2,
4,6...) a range, measurement range selection module are closed the switch at the both ends sampling resistor Rs according to the control signal received,
Vr-Vo=Io × Rs at this time.In sampling module, the A of switch Km1, C-terminal conducting, Km2 closure, Vr and Vo pass through amplification respectively
Device A1 (gain is-| G1 |) and amplifier A2 (gain be | G1 |) and amplifier A3 (gain for-| G2 |) be connected, amplifier A3's
Input voltage is V1, the output voltage of amplifier A3 is V2, the output voltage of amplifier A4 is V3, the output voltage of amplifier A5
For V4, V4=- | G4 | V3, V3=- | G3 | V2, V2=- | G2 | V1, V1=- | G1 | Vr+ | G1 | Vo；.It is big can to obtain output electric current
It is small to be：
Numerically-controlled precise DC current source of the invention is in order to guarantee circuit stability, and current source at work, put by all operations
Big module amplification factor absolute value is no more than 20 times.To export suitable electric current and electric current being kept to stablize, current source is working
When, the amplifier number of participation operation will be selected according to the size of circuit output current.For the sampling resistor for eliminating non-range
The thermal noise of introducing is provided with gating switch at each sampling resistor both ends, is only closed a sampling resistor both ends every time
Gating switch.
Certainly, above-mentioned hardware configuration should also be comprising functional modules such as power module (not shown), these are in the art
Those skilled in the art it should be understood that those skilled in the art in the art can also add corresponding according to the needs of function
Functional module, therefore not to repeat here.
So far, first embodiment of the present disclosure numerically-controlled precise DC current source introduction finishes.
So far, attached drawing is had been combined the embodiment of the present disclosure is described in detail.It should be noted that in attached drawing or saying
In bright book text, the implementation for not being painted or describing is form known to a person of ordinary skill in the art in technical field, and
It is not described in detail.In addition, the above-mentioned definition to each element and method be not limited in mentioning in embodiment it is various specific
Structure, shape or mode, those of ordinary skill in the art simply can be changed or be replaced to it.
It should also be noted that, the direction term mentioned in embodiment, for example, "upper", "lower", "front", "rear", " left side ",
" right side " etc. is only the direction with reference to attached drawing, not is used to limit the protection scope of the disclosure.Through attached drawing, identical element by
Same or similar appended drawing reference indicates.When may cause understanding of this disclosure and cause to obscure, conventional structure will be omitted
Or construction.
And the shape and size of each component do not reflect actual size and ratio in figure, and only illustrate the embodiment of the present disclosure
Content.In addition, in the claims, any reference symbol between parentheses should not be configured to the limit to claim
System.
Furthermore word "comprising" does not exclude the presence of element or step not listed in the claims.It is located in front of the element
Word "a" or "an" does not exclude the presence of multiple such elements.
The word of ordinal number such as " first ", " second ", " third " etc. used in specification and claim, with modification
Corresponding element, itself is not meant to that the element has any ordinal number, does not also represent the suitable of a certain element and another element
Sequence in sequence or manufacturing method, the use of those ordinal numbers are only used to enable an element and another tool with certain name
Clear differentiation can be made by having the element of identical name.
Those skilled in the art will understand that can be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more devices different from this embodiment.It can be the module or list in embodiment
Member or component are combined into a module or unit or component, and furthermore they can be divided into multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it can use any
Combination is to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so disclosed
All process or units of what method or apparatus are combined.Unless expressly stated otherwise, this specification is (including adjoint power
Benefit require, abstract and attached drawing) disclosed in each feature can carry out generation with an alternative feature that provides the same, equivalent, or similar purpose
It replaces.Also, in the unit claims listing several devices, several in these devices can be by same hard
Part item embodies.
Similarly, it should be understood that in order to simplify the disclosure and help to understand one or more of each open aspect,
Above in the description of the exemplary embodiment of the disclosure, each feature of the disclosure is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the disclosed method should not be interpreted as reflecting the following intention：It is i.e. required to protect
The disclosure of shield requires features more more than feature expressly recited in each claim.More precisely, as following
Claims reflect as, open aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following specific embodiment are expressly incorporated in the specific embodiment, wherein each claim itself
All as the separate embodiments of the disclosure.
Particular embodiments described above has carried out further in detail the purpose of the disclosure, technical scheme and beneficial effects
Describe in detail it is bright, it is all it should be understood that be not limited to the disclosure the foregoing is merely the specific embodiment of the disclosure
Within the spirit and principle of the disclosure, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the disclosure
Within the scope of shield.
Claims (8)
1. a kind of Digital Control Direct Current Source, including：
Host computer, output are connected with the input of control module；
D/A conversion module, input are connected with control module output, and output is connected with the input of current generating module；
Current generating module, output are connected with load, and input is connected with control module and the output of D/A conversion module, for producing
Raw required output electric current；
Control module, output are connected with D/A conversion module, current generating module, and input is connected to host computer, upper for receiving
The instruction that machine issues, is handled and is generated the control signal of D/A control module and current generating module, is controlled the D/A
Module and current generating module are controlled accordingly, generate required output electric current；
Wherein, the current generating module includes：
Power amplifier module, input terminal are connected to the output end of D/A conversion module and sampling module, for receiving D/A modulus of conversion
The sampled signal that the voltage signal and sampling module that block generates generate, output are connected to the defeated of measurement range selection module and sampling module
Enter end, for sending the resulting voltage signal of operation to measurement range selection module and sampling module；
Measurement range selection module, control signal are connected to control module output end, for receiving the control letter of control module generation
Number, while measurement range selection module input is also connect with power amplifier module, receives the resulting voltage signal of its operation, range choosing
The output end for selecting module is connected to load and sampling module, by range conversion and output current sample feedback, required for output
Electric current；
Sampling module, control signal are connected to control module output end, for receiving the control signal of control module generation, together
When sampling module first input end connect with the output end of power amplifier module, the second input terminal is defeated with measurement range selection module
Outlet connection, exports for sampling the voltage difference at range selecting module both ends, while by the voltage value calculated to power amplifier
Module forms feedback network.
In the current generating module,
Power amplifier module includes power amplifier device, resistance R1 and R2, and the output end of D/A conversion module is connected to resistance R1's
First end, the second end of resistance R1 are connected to the first end of resistance R2 and the first input end of power amplifier device, power amplifier
The first of second input end grounding of device, the output end of power amplifier device and measurement range selection module input and sampling module
Input terminal is connected, and resistance R2 second end is connected with the output end of sampling module；
Measurement range selection module includes the sampling resistor branch of multiple parallel connections, and one end connects the output end of power amplifier device, separately
One end connects the second input terminal of sampling module, and relay switch is respectively set in sampling resistor both ends in the branch of each parallel connection；
Sampling module includes 5 operational amplifiers, and wherein the input terminal of amplifier A1 is connected to the output end of power amplifier device,
Output end is connected to the input terminal of amplifier A3, and the input terminal of amplifier A2 is connected to the output end of measurement range selection module, amplification
The output end of device A2 is connected to the input terminal of amplifier A3, and the output end of amplifier A3 is connected to the first end of switch Km1, switch
The Km1 first via is directly connected to the resistance R2 second end of power amplifier module, and the second tunnel switch Km1 passes through concatenated amplifier
A4, A5 and switch Km2 are connected to the resistance R2 second end of power amplifier module.
2. Digital Control Direct Current Source according to claim 1, wherein host computer is by sending opening for power supply to control module
Logical, closing, the instruction of measurement range selection, output size of current control Digital Control Direct Current Source.
3. Digital Control Direct Current Source according to claim 2, wherein control module includes programmable logic device and upper
Machine interface circuit is decoded by the instruction issued to received host computer, generates the control sequential and electricity of D/A conversion module
The switch control signal in generation module is flowed, so that D/A conversion module and current generating module is cooperated, generates required output
Electric current.
4. Digital Control Direct Current Source according to claim 3, the D/A conversion module includes D/A converter and D/A benchmark
Voltage generator and its peripheral circuit.
5. Digital Control Direct Current Source according to claim 4, further includes：
External power supply module is connected with control module, D/A conversion module, current generating module, is the control module, D/A turns
Change the mold block, current generating module power supply.
6. Digital Control Direct Current Source according to claim 1, wherein current generating module can be according to the control of control module
Signal is configured to high current generation module and low current generation module.
7. Digital Control Direct Current Source according to claim 6, the output of host computer is connected with the input of control module, control
Module receives the instruction of host computer, is converted to control logic, controls the D/A conversion module being connected with control module output end, amount
Journey selecting module, sampling module；D/A conversion module receive control module control logic, export corresponding voltage signal Vin to
The first input end of power amplifier module, the output voltage of power amplifier module are denoted as Vr, the output voltage of measurement range selection module
It is denoted as Vo, output electric current is the output electric current Io of current source, and the output voltage of sampling module is denoted as V4, in power amplifier module
In, Vin passes through resistance R1, R2 with V4 respectively and is connected with power amplifier, wherein R1=R2, the second input termination of power amplifier
Ground, at this time Vin=-V4；In measurement range selection module, a shared n/2 range, n=2,4,6..., measurement range selection module according to
The control signal received is closed the switch at the both ends sampling resistor Rs, at this time Vr-Vo=Io × Rs.
8. Digital Control Direct Current Source according to claim 7, when current generating module is configured to high current generation module,
In sampling module, the end A, B conducting of switch Km1, Km2 closure, amplifier A4, A5 do not access circuit, and Vr and Vo pass through respectively
Gain is-| G1 | amplifier A1 and gain be | G1 | amplifier A2 and gain for-| G2 | amplifier A3 be connected, amplifier
The input voltage of A3 is V1, and the output voltage V2 of amplifier A3 is exactly the output voltage V4, V4=- of sampling module at this time | G2 |
V1；V1=- | G1 | Vr+ | G1 | Vo；Can obtain output size of current is：
When current generating module is configured to low current generation module, in sampling module, the A of switch Km1, C-terminal conducting, Km2
Closure, Vr and Vo pass through respectively gain be-| G1 | the A1 of amplifier and gain be | G1 | amplifier A2 and gain be-| G2 |
Amplifier A3 is connected, and the gain of amplifier A4 and A5 is respectively-| G3 | and-| G4 |, the input voltage of amplifier A3 is V1, amplification
The output voltage of device A3 is V2, the output voltage of amplifier A4 is V3, the output voltage of amplifier A5 is V4, V4=- | G4 | V3,
V3=- | G3 | V2, V2=- | G2 | V1, V1=- | G1 | Vr+ | G1 | Vo；Can obtain output size of current is：
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| CN103218000B (en) * | 2012-01-20 | 2015-02-11 | 中国科学院电子学研究所 | Numerical-control direct-current current source |
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