CN107229302A - The on-chip system of voltage controlled current source drive circuit and put forward high-precision method using it - Google Patents
The on-chip system of voltage controlled current source drive circuit and put forward high-precision method using it Download PDFInfo
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- CN107229302A CN107229302A CN201710526100.1A CN201710526100A CN107229302A CN 107229302 A CN107229302 A CN 107229302A CN 201710526100 A CN201710526100 A CN 201710526100A CN 107229302 A CN107229302 A CN 107229302A
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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
Abstract
The on-chip system of control constant current source driving circuit disclosed by the invention, including digital control unit, digital control unit respectively with DAC module, electric resistance array is connected with current array, DAC module is connected with biasing circuit module and voltage-current converter circuit module respectively, and voltage-current converter circuit module is also connected with current array output end and electric resistance array respectively；The on-chip system of voltage controlled current source drive circuit of the present invention, high M Bit processing is carried out to target output driving current by M Bit current compensation array, N Bit DAC carries out low N Bit processing to target output driving current, target output driving current precision is subjected to segment processing, the output driving current of final constant current source driving circuit reaches (M+N) Bit required precision in target zone, output driving current precision is improved locally；The invention further relates to the method that the on-chip system using the voltage controlled current source drive circuit improves voltage controlled current source drive circuit local accuracy.
Description
Technical field
The invention belongs to high-precision voltage controlled current source drive circuit technical field, and in particular to a kind of voltage controlled current source driving
The on-chip system of circuit, improves voltage controlled current source the invention further relates to the on-chip system using the voltage controlled current source drive circuit and drives
The method of dynamic circuit local accuracy.
Background technology
With the improvement of people ' s living standards and science and technology is continued to develop, high precision component is in industry, military, doctor
The every field such as treatment suffer from very important status.Current high-precision constant current source driving circuit is also the heat of people's research
Point.Mainly include two kinds of forms from the more extensive constant-current source of prior art application：Pulse-width-modulating type constant-current source and voltage-controlled
Constant-current source.Pulse-width-modulating type constant-current source is by controlling the working pulse width of adjuster so as to reach the mesh that constant current is exported
, this mode efficiency is higher, but ripple current is big, electric current output accuracy is low, radiation interference is strong；Voltage-controlled constant current is by adjusting electricity
The control voltage of piezo-electric stream change-over circuit, reaches the purpose of control electric current, and such a mode has that precision is high, ripple is small, distortion is small
The features such as, but output area is smaller, it is adaptable to high-precision occasion.
The general principle of voltage controlled current source is so as to controlling output voltage, then voltage to be led to by microprocessor control DAC
Overvoltage-current circuit is converted to electric current, so as to reach the purpose by control voltage come control electric current.Although voltage controlled current source
Drive circuit has high-precision feature, but the implementation of existing voltage controlled current source drive circuit is mainly pcb board level circuit,
By by single-chip microcomputer, voltage-power conversion circuit module and the electronics member device such as triode, power field effect pipe and resistance, electric capacity
Part is welded on pcb board, so as to obtain output driving current.Existing constant current source driving circuit is mainly made by single-chip microcomputer simultaneously
For the middle control unit of whole drive system, drive circuit is controlled so as to the adjustable driving of output area size by its internal DAC
Electric current.But DAC limited precisions inside single-chip microcomputer, in order to reach that high-precision requirement can typically use high-precision DAC module,
But high-precision DAC module is still vulnerable to extraneous line after being attached on pcb board with other modules, noise etc. is non-ideal
The interference of factor, causes output driving current precision to be unable to reach higher requirement.Area used in PCB circuits is big simultaneously, removable
Plant property is low, it is impossible to meet the requirement of circuit integration.
The content of the invention
It is an object of the invention to provide a kind of on-chip system of voltage controlled current source drive circuit, output driving electricity can be made
Stream precision is improved locally.
Voltage controlled current source driving electricity is improved present invention also offers the on-chip system using the voltage controlled current source drive circuit
The method of road local accuracy.
The first technical scheme of the present invention is：The on-chip system of voltage controlled current source drive circuit, including numeral
Control unit, digital control unit respectively with DAC module, electric resistance array is connected with current array, DAC module respectively with biasing
Circuit module is connected with current/charge-voltage convertor module, and current/charge-voltage convertor module is also defeated with current array respectively
Go out end with electric resistance array to be connected.
Second of technical scheme of the present invention be：
The method that the on-chip system of voltage controlled current source drive circuit improves voltage controlled current source drive circuit local accuracy, including
Following steps,
Step 1：Target output driving current digital quantity is inputted to digital control unit；
Step 2：Digital control unit carries out judgement calculating to the digital quantity in step 1, draws segmentation digital quantity；
Step 3：By corresponding module in the segmentation digital quantity input system in step 2, the drive of aims of systems output is completed
Streaming current.
The characteristics of second of technical scheme of the invention, also resides in,
Step 1 is specifically included：
Step 1.1：By target output driving current initial number amount D'0With termination digital quantity D'1Send into digital control list
Member；
Step 1.2：Digital control unit is according to the D' in step 1.10And D'1Calculate target output driving current initial value
i'0, target output driving current stop value i'1, its calculation formula is：
And then calculate target output driving current scope I1, I1=(i'1-i'0)
In formula (1) and formula (2), Z is systemic resolution value, and size is the resolution value M and DAC module of current array
Resolution value sum；I0For system output driving current amplitude range, drawn by below equation：
I0=(i1-i0) (3)
In formula (3), i1For system output driving current maximum, i0For system output driving current minimum value, its value is
0。
Step 2 is specifically included：
Step 2.1：As the I obtained in step 1.21Value is less than or equal to i × 2(N-1)When, to where target output driving current
Region is judged that wherein i is system output driving current precision, is drawn by below equation
Step 2.2：Electric resistance array is calculated respectively according to the target output driving current judged result in step 2.1
Resistance multiplication factor Q, the current compensation number P of current array, the DAC initial number amounts of DAC module.
Step 2.2 is specifically included：
When it is 0 that target output driving current initial value, which is system output driving current minimum value, the resistance of electric resistance array
Multiplication factor Q is：
The current compensation number P of current array is 0, and the DAC initial numbers amount of DAC module is that M is resistance in 0, formula (5)
The resolution value of array, size is equal with the resolution value of current array；
When target output driving current stop value is that system output driving current maximum is i1When, the resistance of electric resistance array
Multiplication factor Q calculation is formula (5), and the current compensation number P of current array is：
The DAC initial number amounts of DAC module are：
K is the scanning step number of DAC module in formula (7), and step value is 1；
When the endpoint value of target output driving current value is not at system output driving current value end points, electric resistance array
Resistance multiplication factor Q calculation is formula (5), and the current compensation number P of current array calculation is formula (6),
The DAC initial number amounts of DAC module are：
Step 3 is specifically included：The resistance multiplication factor Q input resistances of gained electric resistance array will be calculated in step 2.2 respectively
Array, the current compensation number P input current arrays of current array, the DAC initial numbers amount input DAC module of DAC module is complete
Into the driving current that aims of systems output resolution ratio value is M+N.
The beneficial effects of the invention are as follows：The on-chip system of voltage controlled current source drive circuit of the present invention, passes through M-Bit electric current
Compensated array carries out high M-Bit processing to target output driving current, and N-Bit DAC is low to the progress of target output driving current
N-Bit processing, segment processing, the output driving current of final constant current source driving circuit are carried out by target output driving current precision
(M+N)-Bit required precision is reached in target zone, output driving current precision is improved locally；The present invention is adopted
Original plate level module is integrated among a chip, so as to realize higher by integrated circuit than existing PCB circuits
Integrated level, while directly realizing that constant current source driving circuit is high-precision using high-precision DAC-circuit module than traditional and wanting
Ask, the present invention can use the DAC-circuit of lower accuracy to coordinate the height for realizing constant current source driving circuit with current compensation circuit
Accuracy requirement, in the case of same precision, circuit power consumption, area is all very significantly improved, and integrated circuit is compared with PCB electricity
Road has portability, can be convenient to be applied in all kinds of detection sensors, realizes high-precision, the index such as high integration.
Brief description of the drawings
Fig. 1 is the structural representation of the on-chip system of voltage controlled current source drive circuit of the present invention；
Fig. 2 be voltage controlled current source drive circuit of the present invention on-chip system in current/charge-voltage convertor module structure
Schematic diagram；
Fig. 3 be voltage controlled current source drive circuit of the present invention on-chip system in improve current precision schematic diagram；
Fig. 4 be voltage controlled current source drive circuit of the present invention on-chip system in M-Bit electric resistance arrays structural representation；
Fig. 5 be voltage controlled current source drive circuit of the present invention on-chip system in M-Bit current array structural representation.
In figure, 1. digital control units, 2. biasing circuit modules, 3.DAC modules, 4. electric resistance arrays, 5. voltage-to-currents turn
Change circuit module, 6. current array.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described in detail.
The on-chip system of voltage controlled current source drive circuit of the present invention, as shown in figure 1, including digital control unit 1, biased electrical
Road module 2, DAC module 3, electric resistance array 4, current/charge-voltage convertor module 5, current array 6.Wherein DAC module 3 point
Resolution value size is N, and the resolution value size of electric resistance array 4 is M, and the resolution value size of current array 6 is M.
Wherein digital control unit 1 is connected with DAC module 3, electric resistance array 4 and current array 6, and DAC is scanned into step number K
By the digital control line traffic control DAC modules 3 of N-Bit, while resistance multiplication factor Q is passed through into the digital control line traffic control electricity of M-Bit
Resistance array 4 is switched, and compensation electric current number P is switched by the digital control line traffic control current array 6 of M-Bit.Biasing circuit
Module 2 is connected with DAC module 3, is that DAC module 3 provides reference current, DAC module 3 and the phase of current/charge-voltage convertor module 5
Connection, by DAC output voltage control voltage-current converter circuit module 5, current/charge-voltage convertor module 5 passes through resistance
The output current of array 4, and be connected with the output end of current array 6, final output target output current.
The method that said system improves voltage controlled current source drive circuit local accuracy：
The digital quantity that the Z-Bit resolution ratio of target output driving current scope will be represented first is input to numeral in Fig. 1
Control unit 1, wherein Z-Bit are system requirements resolution ratio, and its value size is (M+N)-Bit.
Secondly digital control unit 1 is sentenced to target output driving current scope in system output driving current scope
It is disconnected：Because the output driving current Iout of current/charge-voltage convertor module 5 its input terminal voltage of size and output end in Fig. 2
The proportional change of resistance R1 ratio, while the input terminal voltage of current/charge-voltage convertor module 5 and the output end of DAC module 3
The proportional change of resistance, thus Iout also with the output end resistance R2 of DAC module 3 and current source output resistance R1 ratio into than
Example change；So in the case that input voltage range is certain, passing through proportional change R1 and R2 resistance value, you can obtain into
The output driving current step value that ratio reduces, so as to improve dotted line institute in local output driving current precision, the result such as Fig. 3
Represent due to after the proportional change of resistance identical input voltage with scanning step number in the case of, the slope of electric current becomes
Change so that local current precision is improved, and the electric resistance array 4 that R1 and R2 can be as shown in Figure 4 is constituted, and passes through digital control amount
By the resistance access circuit of different numbers so as to realize that ratio changes, but because current slope change can cause starting defeated in Fig. 3
Enter the output current value corresponding to voltage also to change, its value is different from target current value, it is desirable to have compensation electric current If is to rising
Beginning current value is compensated, and in A point input offset currents in such as Fig. 2, output driving current is met aims of systems output area,
Slope variation is retreaded solid line in its result such as Fig. 3, and the current array 6 that If compensation electric currents can be as shown in Figure 5 is realized.It is digital afterwards
Control unit 1 calculates resistance according to target output driving current range size and the analysis of target output driving current range position
Digital quantity required for array 4, current array 6 and DAC module 3.
Last digital control unit 1 is by the control end of respective modules, system output therewith in these digital quantity feeding systems
Driving laser diode current can realize (M+N)-Bit required precision in target interval.Specifically implement according to following steps：
Step 1：Target output driving current digital quantity is inputted to digital control unit 1, is specifically included：
Step 1.1：By target output driving current initial number amount D'0With termination digital quantity D'1Send into digital control unit
1；
Step 1.2：Digital control unit 1 is according to the D' in step 1.10And D'1Calculate target output driving current initial value
i'0, target output driving current stop value i'1, its calculation formula is：
And then calculate target output driving current scope I1, I1=(i'1-i'0)
In formula (1) and formula (2), Z is systemic resolution value, and size is the resolution value M and DAC moulds of current array 6
The resolution value sum of block 3；I0For system output driving current amplitude range, drawn by below equation：
I0=(i1-i0) (3)
In formula (3), i1For system output driving current maximum, i0For system output driving current minimum value, its value is
0。
Step 2：Digital control unit 1 carries out judgement calculating to the digital quantity in step 1, draws segmentation digital quantity, specifically
Including：
Step 2.1：As the I obtained in step 1.21Value is less than or equal to i × 2(N-1)When, to where target output driving current
Region is judged that wherein i is system output driving current precision, is drawn by below equation
Step 2.2：Electric resistance array 4 is calculated respectively according to the target output driving current judged result in step 2.1
Resistance multiplication factor Q, the current compensation number P of current array 6, the DAC initial number amounts of DAC module 3 specifically include：
When it is 0 that target output driving current initial value, which is system output driving current minimum value, the resistance of electric resistance array 4
Multiplication factor Q is：
The current compensation number P of current array 6 is 0, and the DAC initial numbers amount of DAC module 3 is that M is electricity in 0, formula (5)
The resolution value of array 4 is hindered, size is equal with the resolution value of current array 6；
When target output driving current stop value is that system output driving current maximum is i1When, the electricity of electric resistance array 4
The calculation for hindering multiplication factor Q is formula (5), and the current compensation number P of current array 6 is：
The DAC initial number amounts of DAC module 3 are：
K is the scanning step number of DAC module 3 in formula (7), and step value is 1；
When the endpoint value of target output driving current value is not at system output driving current value end points, electric resistance array 4
Resistance multiplication factor Q calculation be formula (5), the current compensation number P of current array 6 calculation is formula
(6), the DAC initial number amounts of DAC module 3 are：
Wherein, the resistance multiplication factor Q of electric resistance array 4, the current compensation number P of current array 6 and DAC module 3
It is integer value that DAC initial numbers, which measure value, can be rounded downwards.
Step 3：By corresponding module in the segmentation digital quantity input system in step 2, the drive of aims of systems output is completed
Streaming current, is specifically included：The resistance multiplication factor Q input resistances array 4 of gained electric resistance array 4 will be calculated in step 2.2 respectively,
The current compensation number P input currents array 6 of current array 6, the DAC initial numbers amount input DAC module 3 of DAC module 3 is complete
Into the driving current that aims of systems output resolution ratio value is M+N.
The present invention principle be：The driving current of its output of current/charge-voltage convertor module in constant current source driving circuit
Value change proportional to its input voltage and output end resistance ratio.Therefore when input voltage range it is certain in the case of, into than
Example increase output end resistance value, you can the output driving current step value of proportional reduction is obtained, while output driving current value
Change proportional to the ratio of DAC output ends resistance and current source output resistance, therefore two groups of resistance are subjected to ratio distribution,
So as to improve local output driving current precision.But because the output end resistance of current/charge-voltage convertor changes, it can make
Also changed into the output current value corresponding to start input voltage, it is different from target current value, therefore by adding electric current
Array, is compensated by current array to initial current value, output driving current is met aims of systems output area.Finally
After the segment processing of N-Bit DAC and M-Bit current array, constant current source driving circuit can locally reach (M+N)-
Bit required precision.
The on-chip system of voltage controlled current source drive circuit of the present invention, by M-Bit current array 6 to target output driving
Electric current carries out high M-Bit processing, and N-Bit DAC module 3 carries out low N-Bit processing to target output driving current, and target is defeated
Go out driving current precision and carry out segment processing, the output driving current of final constant current source driving circuit reaches (M+ in target zone
N)-Bit required precision, makes output driving current precision be improved locally；Integrated circuit of the present invention than
Existing PCB circuits, original plate level module is integrated among a chip, so that higher integrated level is realized, while compared with
Tradition directly realize that constant current source driving circuit is high-precision using high-precision DAC-circuit module and require that the present invention can be adopted
Coordinate the requirements for high precision that constant current source driving circuit is realized with current compensation circuit with the DAC-circuit of lower accuracy, identical
In the case of precision, circuit power consumption, area is all very significantly improved, and integrated circuit has portability compared with PCB circuits,
It can be convenient to be applied in all kinds of detection sensors, realize high-precision, the index such as high integration.
Claims (6)
1. the on-chip system of voltage controlled current source drive circuit, it is characterised in that including digital control unit (1), digital control list
First (1) respectively with DAC module (3), electric resistance array (4) is connected with current array (6), DAC module (3) respectively with biasing circuit
Module (2) is connected with current/charge-voltage convertor module (5), current/charge-voltage convertor module (5) also respectively with electric current
Array (6) output end is connected with electric resistance array (4).
2. the on-chip system of voltage controlled current source drive circuit as claimed in claim 1 improves voltage controlled current source drive circuit local accuracy
Method, it is characterised in that comprise the following steps,
Step 1：Target output driving current digital quantity is inputted to digital control unit (1)；
Step 2：Digital control unit (1) carries out judgement calculating to the digital quantity in step 1, draws segmentation digital quantity；
Step 3：By corresponding module in the segmentation digital quantity input system in step 2, the driving electricity of aims of systems output is completed
Stream.
3. the method for voltage controlled current source drive circuit local accuracy is improved as claimed in claim 2, it is characterised in that step 1
Specifically include：
Step 1.1：By target output driving current initial number amount D'0With termination digital quantity D1' feeding digital control unit (1)；
Step 1.2：Digital control unit (1) is according to the D' in step 1.10And D1' calculate target output driving current initial value
i'0, target output driving current stop value i1', its calculation formula is：
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And then calculate target output driving current scope I1, I1=(i1'-i'0)
In formula (1) and formula (2), Z is systemic resolution value, and size is the resolution value M and DAC module of current array (6)
(3) resolution value sum；I0For system output driving current amplitude range, drawn by below equation：
I0=(i1-i0) (3)
In formula (3), i1For system output driving current maximum, i0For system output driving current minimum value, its value is 0.
4. the method for voltage controlled current source drive circuit local accuracy is improved as claimed in claim 3, it is characterised in that step 2
Specifically include：
Step 2.1：As the I obtained in step 1.21Value is less than or equal to i × 2(N-1)When, to target output driving current region
Judged, wherein i is system output driving current precision, is drawn by below equation
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Step 2.2：Electric resistance array (4) is calculated respectively according to the target output driving current judged result in step 2.1
Resistance multiplication factor Q, the current compensation number P of current array (6), the DAC initial number amounts of DAC module (3).
5. the method for voltage controlled current source drive circuit local accuracy is improved as claimed in claim 4, it is characterised in that step
2.2 specifically include：
When it is 0 that target output driving current initial value, which is system output driving current minimum value, the resistance of electric resistance array (4) is put
Big multiple Q is：
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The current compensation number P of current array (6) is 0, and the DAC initial numbers amount of DAC module (3) is that M is electricity in 0, formula (5)
The resolution value of array (4) is hindered, size is equal with the resolution value of current array (6)；
When target output driving current stop value is that system output driving current maximum is i1When, the resistance of electric resistance array (4) is put
Big multiple Q calculation is formula (5), and the current compensation number P of current array (6) is：
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The DAC initial number amounts of DAC module (3) are：
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K is the scanning step number of DAC module (3) in formula (7), and step value is 1；
When the endpoint value of target output driving current value is not at system output driving current value end points, electric resistance array (4)
Resistance multiplication factor Q calculation is formula (5), and the current compensation number P of current array (6) calculation is formula
(6), the DAC initial number amounts of DAC module (3) are：
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6. the method for voltage controlled current source drive circuit local accuracy is improved as claimed in claim 5, it is characterised in that step 3
Specifically include：The resistance multiplication factor Q input resistances array (4) of gained electric resistance array (4), electricity will be calculated in step 2.2 respectively
Flow the current compensation number P input currents array (6) of array (6), the DAC initial numbers amount input DAC module of DAC module (3)
(3) driving current that aims of systems output resolution ratio value is M+N, is completed.
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