CN107340795A - Numerical control constant-current source device with cut-in voltage preprocessing function - Google Patents
Numerical control constant-current source device with cut-in voltage preprocessing function Download PDFInfo
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- G—PHYSICS
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- 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
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Abstract
The present invention relates to a kind of numerical control constant-current source device with cut-in voltage preprocessing function, by increasing the pretreatment measure for high-power N-channel FET cut-in voltage, the initial gate voltage of power field effect pipe is properly increased, because using above-mentioned technical solution, compared with prior art, the positive effect of the present invention is：The conducting speed of power field effect pipe is accelerated, improves the drive efficiency of power field effect tube drive circuit, improves the dynamic response performance of power digital-control constant-flow source, therefore the present invention has very big practical advantages；In addition, the initial gate voltage for being carried in power field effect pipe can be also adjusted flexibly in the present invention according to use condition, needed with being applicable a variety of power field effect pipe applications；Realized using conventional electronic component, device is easy to purchase, had a good application prospect.
Description
Technical field
The present invention relates to instrument and meter and electronic surveying field, especially a kind of number with cut-in voltage preprocessing function
Control constant-current source device, can be widely applied to the instrument and meters such as Switching Power Supply, linear power supply, electronic load and direct current resistance m easurem ent or
In equipment.
Background technology
Digital-control constant-flow source is a kind of conventional electronic circuit, power electronic equipment aging, linear power supply, Switching Power Supply,
Extensive use in the occasions such as electronic load, over-current detection.
As shown in Figure 1, the circuit using operational amplifier as core constitutes a deep negative to common digital-control constant-flow source
Feedback, high-power N-channel reinforced insulation gate field-effect transistor is used as electric current conversion element to meet wanting for High-current output
Ask；Accompanying drawing 2 is the transfer characteristic curve and output characteristic curve of N-channel reinforced insulation gate field-effect transistor, with reference to the accompanying drawings 2 can
Know, due to cut-in voltage UGS(th)Presence, the only voltage between gate-to-source is higher than UGS(th)When, FET could rise
To the effect of control drain current size.Due to cut-in voltage UGS(th)Presence, circuit opens initial a period of time computing and puts
The effect that big device output current charges to FET electric capacity, this portion of energy are only in that the transfer characteristic for overcoming FET
Cut-in voltage U in curveGS(th)Influence, cause FET conducting speed slow, the drive efficiency of FET drive circuit compared with
It is low, the special dynamic response performance for reducing high power constant-current source.
The content of the invention
The technical problem to be solved in the present invention is：It is proposed a kind of digital-control constant-flow source dress with cut-in voltage preprocessing function
Put, by increasing the pretreatment measure for high-power N-channel FET cut-in voltage, properly increase high-power N-channel field
The initial gate voltage of effect pipe, so as to play a part of accelerating the conducting speed of FET, field effect then can be both improved
The drive efficiency of tube drive circuit is answered, the dynamic response performance of high-power numerical control constant-current source can be improved again, there is good answer
Use prospect.
The technical solution adopted in the present invention is：A kind of numerical control constant-current source device with cut-in voltage preprocessing function,
Put including microprocessor unit MCU, control unit FPGA, D/A conversion unit DAC1, D/A conversion unit DAC2, in-phase proportion
Big device unit, anti-phase proportional amplifier unit, error amplifier block, expansion current circuit unit, cut-in voltage setting unit, difference
Circuit unit, power field effect pipe unit, voltage source VCC, range resistance and load.Microprocessor unit MCU is connected to control
Unit F PGA, control unit FPGA are connected to D/A conversion unit DAC1 and D/A conversion unit DAC2；D/A conversion unit
DAC1 is connected to in-phase proportion amplifier unit, and in-phase proportion amplifier unit is connected to error amplifier block, error amplification
Device unit is connected to the input for expanding current circuit unit, and the output end for expanding current circuit unit is connected to the grid of fet power pipe
Pole, fet power pipe miss connection voltage source VCC, and the source electrode of FET is connected to range resistance Rs one end, range
The resistance Rs other end is connected to load RL, loads RL other end ground connection, the in-phase input end connection of differential amplification unit
Range resistance Rs one end and the source electrode of FET, the inverting input of error amplifier and the range resistance Rs other end and
Load RL one end is connected, and the output end of error amplifier block is connected to the another way input of error amplifier；Digital-to-analogue
Converting unit DAC2 output end is connected to the input of in-phase amplifier unit, and the output end of in-phase amplifier unit is connected to
The input of cut-in voltage setting unit, the output end of cut-in voltage setting unit are connected to the output end of error amplifier block
With the input for expanding current circuit unit.
Further, microprocessor unit MCU of the present invention is connected with control unit FPGA, realizes microprocessor
Communication between unit and FPGA unit；Wherein, described microprocessor unit is connected with host computer, receives what host computer was sent
Control instruction.Control unit FPGA passes through synchronous serial communication bus SPI1 connection serial input D/A conversion unit DAC1 sums
Mould converting unit DAC2, D/A conversion unit DAC1 output connect anti-phase proportional amplifier unit, D/A conversion unit DAC1
Output voltage with D/A conversion unit DAC2 realizes conversion of the digital quantity to analog quantity to be all positive voltage.
Further say, D/A conversion unit DAC1 of the present invention output is connected to the defeated of anti-phase proportional amplifier unit
Enter end, the output end of anti-phase proportional amplifier unit is connected to the input all the way of error amplifier block, as numerical control constant current
The input reference voltage in source；Using error amplifier block as core, error amplifier block, expand current circuit unit, power field effect
Ying Guan, range resistance Rs, error amplifier block, constitute a profound and negative feedbck circuit；Described in reference voltage is adjustable
The intensity of current-source arrangement output current, a kind of described numerical control power constant current source device with cut-in voltage preprocessing function
Belong to voltage-controlled current source VCCS.
Further say, D/A conversion unit DAC2 of the present invention output is connected to the defeated of in-phase proportion amplifier unit
Enter end, the output end of in-phase proportion amplifier unit is connected to the input of cut-in voltage setting unit, in-phase proportion amplifier
Reference voltage of the output voltage of unit as cut-in voltage setting unit, the output end connection error of cut-in voltage setting unit
The output end of amplifier unit and the input for expanding current circuit unit, realize the grid voltage pretreatment to power field effect pipe.
Further say, cut-in voltage of the present invention sets circuit unit to need to come with error amplifier block cooperation
Realize that the pretreatment to fet gate voltage is set；Wherein, cut-in voltage sets circuit unit mainly to include：Comparator
U1, operational amplifier U2 ,+15V supply voltages and -15V supply voltages, resistance R1~R10, electric capacity C1~C6, PNP transistor
Q1, NPN transistor Q2, fet power pipe Q3 etc. are formed.
Further say, present invention be characterized in that:D/A conversion unit DAC2 output is connected to comparator U1's
Reversed-phase output ,+15V supply voltages are connected to comparator U1 positive voltage input pin and electric capacity C1 one end, electric capacity
C1 other end ground connection, -15V supply voltages are connected to the grounding pin of comparator and electric capacity C2 one end, and electric capacity C2's is another
End ground connection, the output end connection resistance R1 of comparator one end；The resistance R1 other end and resistance R2 one end, the one of resistance R3
The base stage at end, electric capacity C5 one end and PNP transistor, resistance R1 other end connection+15V supply voltages, resistance R2's is another
End ground connection, electric capacity C5 other end ground connection, PNP transistor Q1 colelctor electrode connection -15V supply voltages, PNP transistor
Emitter stage connection resistance R4 one end and resistance R5 one end, resistance R4 other end ground connection；Resistance R5 other end connection fortune
Amplifier U2 inverting input and electric capacity C6 one end are calculated, the electric capacity C6 other end connects resistance R8 one end, resistance R8's
The in-phase input end of other end concatenation operation amplifier U2 output end, the base stage of NPN transistor and comparator U1, computing are put
Big device U2 in-phase input end connection balance resistance R9, balance resistance R9 other end ground connection, operational amplifier U2 positive supply
One end of input pin connection+15V supply voltages and electric capacity C3, electric capacity C3 other end ground connection, operational amplifier U2 negative electricity
One end of source input pin connection -15V power supplys and electric capacity C3, electric capacity C3 other end ground connection；NPN transistor Q2 colelctor electrode
Connection+15V supply voltages, NPN transistor Q2 emitter stage connection resistance R10 one end and power field effect pipe Q3 grid
Pole, resistance R10 other end ground connection, power field effect pipe Q3 drain electrode connection power supply VCC, power field effect pipe Q3 source electrode connect
Range resistance Rs one end, range resistance Rs other end connection load RL one end are connect, the other end for loading RL is grounded.
Further say, the present invention is when comparator U1 use+15V and -15V supply voltages, then when comparator U1's
When anti-phase input terminal voltage is higher than comparator U1 homophase input terminal voltages, the voltage of comparator U1 output ends is -15V power supplys electricity
Pressure, this -15V supply voltage drag down PNP transistor Q2 base voltage so that PNP transistor Q2 saturation conductions, positive-negative-positive
Transistor Q2 colelctor electrode -15V supply voltages are connected to resistance R4 and resistance R5 one end by conducting channel, with operation amplifier
Device U2 is the circuit of core, including：Resistance R5, resistance R8, resistance R9, electric capacity C6 ,+15V supply voltages, -15V power supplys electricity
Pressure one profound and negative feedbck circuit of composition, empty short conditional are set up, and operational amplifier U2 homophase input terminal potential is anti-phase defeated with its
It is equal to enter terminal potential, realizes virtual earth.
Further say, the present invention is then when comparator U1 anti-phase input terminal voltage is higher than comparator U1 homophase inputs
During terminal voltage, -15V supply voltages are charged by resistance R50 to electric capacity C6, are caused on operational amplifier U2 output end voltages
Rise, when operational amplifier U2 output end voltages are higher than comparator U2 anti-phase input terminal voltage, PNP transistor Q2 transistors
Cut-off, when operational amplifier U2 output end voltages stop rising, then the output voltage of U2 operational amplifiers is equal to open circuit
The input reference voltage of setting unit, realize the setting to power field effect pipe initial gate voltage.
Further say, the initial voltage of power field effect pipe of the present invention is equal to the input ginseng of open circuit setting unit
Examine voltage and subtract junction voltage between the base stage of NPN transistor and emitter stage, the scope of input reference voltage determines power
The predeterminable scope of FET initial gate voltage, D/A conversion unit can be adjusted flexibly according to the difference of use condition
DAC2 inputs the multiplication factor of digital quantity or in-phase proportion amplifying unit, to be applicable the cut-in voltage of various power field effect pipes not
Application requirement simultaneously.
The beneficial effects of the invention are as follows：Arranged by the pretreatment increased for high-power N-channel FET cut-in voltage
Apply, properly increased the initial gate voltage of power field effect pipe, due to using above-mentioned technical solution and prior art
Compare, the positive effect of the present invention is：The conducting speed of power field effect pipe is accelerated, improves power field effect pipe driving electricity
The drive efficiency on road, the dynamic response performance of power digital-control constant-flow source is improved, therefore the present invention has very big practical advantages；
In addition, the initial gate voltage for being carried in power field effect pipe can be also adjusted flexibly in the present invention according to use condition, it is each to be applicable
The different power field effect pipe application of kind needs；Realized using conventional electronic component, device is easy to purchase, and has well
Application prospect.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is traditional numeric-control power constant current source circuit diagram；
Fig. 2 is the transfer characteristic curve and output characteristic curve figure of power MOSFET tube；
Fig. 3 is the apparatus structure schematic diagram of the present invention；
Fig. 4 is that cut-in voltage of the present invention sets circuit theory sketch；
Fig. 5 is the numerical control power constant current source device DAC generation circuits part during the present invention is implemented；
Fig. 6 is the numerical control power constant current source device constant-current source circuit part during the present invention is implemented.
Embodiment
Presently in connection with accompanying drawing and preferred embodiment, the present invention is further detailed explanation.These accompanying drawings are simplified
Schematic diagram, only illustrate the basic structure of the present invention in a schematic way, therefore it only shows the composition relevant with the present invention.
A kind of numerical control constant-current source device with cut-in voltage preprocessing function as shown in Figure 3, including microprocessor list
It is first MCU, control unit FPGA, D/A conversion unit DAC1, D/A conversion unit DAC2, in-phase proportion amplifier unit, anti-phase
Proportional amplifier unit, error amplifier block, expand current circuit unit, cut-in voltage setting unit, difference channel unit, power
FET unit, voltage source VCC, range resistance and load.Microprocessor unit MCU is connected to control unit FPGA, control
Unit F PGA is connected to D/A conversion unit DAC1 and D/A conversion unit DAC2；D/A conversion unit DAC1 is connected to compared with
Example amplifier unit, in-phase proportion amplifier unit are connected to error amplifier block, and error amplifier block is connected to expansion stream
The input of circuit unit, the output end for expanding current circuit unit are connected to the grid of fet power pipe, fet power pipe
Connection voltage source VCC is missed, the source electrode of FET is connected to range resistance Rs one end, range resistance Rs other end connection
To load RL, load RL other end ground connection, the in-phase input end connection range resistance Rs of differential amplification unit one end and
The source electrode of FET, the inverting input of error amplifier are connected with one end of the range resistance Rs other end and load RL
Connect, the output end of error amplifier block is connected to the another way input of error amplifier；D/A conversion unit DAC2's is defeated
Go out the input that end is connected to in-phase amplifier unit, the output end of in-phase amplifier unit is connected to cut-in voltage setting unit
Input, the output end of cut-in voltage setting unit is connected to the output end of error amplifier block and expands current circuit unit
Input.
Operation principle and process are as follows：
With reference to accompanying drawing 4, calculate and derive：
Microprocessor unit MCU receives the control instruction on digital quantity size from host computer, passes through parallel or string
Row data/address bus connection control unit FPGA realizes that logarithmic mode converting unit DAC1 and D/A conversion unit DAC2 digital quantity are set
Put, the monopole sexual norm of D/A conversion unit work, the digital quantity received is converted into positive voltage.
If the digital control amount that D/A conversion unit DAC1 is received is D1, the numeral that D/A conversion unit DAC1 is received
Controlled quentity controlled variable is D2, VREFFor the reference voltage of D/A conversion unit, N is the resolution ratio of D/A conversion unit,
If D/A conversion unit DAC1 output voltage VOUT1For：
If D/A conversion unit DAC1 output voltage VOUT2For：
If the multiplication factor of anti-phase scaling unit is-K1, then its output voltage VOUT3For：
If the multiplication factor of in-phase proportion amplifying unit is K2, then its output voltage VOUT4For：
With reference to shown in accompanying drawing 4, cut-in voltage setting up procedure is as follows：
If output voltage VOUT4The as input reference voltage U of cut-in voltage setting unitth_REF,
If operational amplifier U2 output voltage is Uth_SET, comparator U1 output voltage is U1OUT,
Transistor Q1 base potentials are Ub, transistor Q1 transmitting electrode potentials are Ue,
Work as Uth_SET<Uth_REFWhen, comparator U1 output voltage U1OUT=-15V, then
Wherein, R1=24k, R2=51k, R3=10k, substitute into (6) and obtain：
Ub=-2.34V ... (7)
Further, Ueb=Ue-Ub=2.34V ... (8)
Transistor Q1 is turned on, and has electric current IeColelctor electrode is flowed to from Q1 emitter stage, now transistor Q1 launches electrode potential：Ue
=0-Ie×R4<0
If flow through resistance R5Electric current be iR, flow through electric capacity C6Electric current be iC, the circuit using operational amplifier U2 as core
Form a profound and negative feedbck, empty short establishment；Further, operational amplifier U2 in-phase input end passes through resistance R9Ground connection, institute
With electric capacity C6Electric current be icFor " virtual earth "；
In circuit, resistance R is flowed through5Electric current iREqual to electric capacity C6In electric current be iC：
From time t1To time t2Period, operational amplifier U2 output voltage is Uth_SET：
By (10) formula, it is known that operational amplifier U2 output voltage Uth_SETRaise over time, i.e. fet gate
Voltage Ugs=Uth_SET-VbeInitial voltage raises over time.
Work as Uth_SET>Uth_REFWhen, comparator U1 output end open collector is equivalent to high-impedance state, then
Because Ueb=Ue-Ub<0, so transistor Q1 ends, Ue=0
From formula (9)：I.e. now electric capacity C6Stop charging, operational amplifier U2 output voltage
Stop rising.
In summary, during stable state, the output voltage of operational amplifier is equal to the input of cut-in voltage setting unit with reference to electricity
Pressure,
I.e.
Then, from formula (12), above-mentioned cut-in voltage sets grid voltage of the circuit realiration to power field effect pipe
Setting.
Cut-in voltage sets circuit to be intended to be configured the initial gate voltage of power field effect pipe, to accelerate its conducting
Speed, improve its dynamic response performance, so in specific application, it is necessary to be obtained in advance by power field effect pipe databook
Its cut-in voltage parameter Uth(on), open circuit set reference voltage need to meet condition：Uth_REF<Uth(on)
With reference to shown in accompanying drawing 6, if output voltage VOUT3The as input reference voltage U of digital-control constant-flow sourcei_REF,
Circuit using UA301A as core constitutes a profound and negative feedbck, operational amplifier UA301 No. 2 pins and
Formation is empty short between 3 pins, and UA301 No. 3 pins are grounded by resistance RA311, then the electricity of UA301 No. 2 pin and 3 pins
Position is equal to zero, is " virtual earth ".
If Ri=RA306//RA307, Rf=RA313+RA393, Rs=RA324,Output current is Iout,
Then broken according to empty short and void, during circuit balancing, flow through resistance RiElectric current be equal to flow through resistance RfElectric current,
I.e.
Then,
IfK4 is substituted into formula (16) to obtain,
From formula (17)：The size of output current is proportional to small, the reasonably combined parameter of input digital quantity, and number can be achieved
Control constant-current source.
Shown in circuit as accompanying drawing 5 and accompanying drawing 6：
UA101 is ultra-low noise reference voltage chip, input is+15V supply voltages, is exported as 2.50V reference voltages, electricity
Hold the input shunt capacitance that CA102 electric capacity CA104 is UA101, electric capacity CA103, electric capacity CA104, CA105 electric capacity are UA101's
Export shunt capacitance；Voltage reference precision is the higher the better, and temperature drift is the smaller the better.
UA102 and UA104 is that serial 16 DAC chips AD5541CRZ ,+5VD are supply voltages, and VREF2V5 is 2.50V
Input voltage benchmark.NCS1, nCS2, DIN1, SCLK1 signal come from control unit FPGA, wherein, nCS1, nCS2 are piece choosing letter
Number DIN1 signals are serial data, and SCLK1 is 20MHz clock signals, and UA101 and UA102 are unipolar output, output voltage model
Enclose for 0 to 2.50V.
UA105, UA301 are high accuracy, low noise, low offset current dual operational amplifier chip, with a width of 10MHz, on
Lifting speed is 4V per microsecond.
UA105A, resistance RA104, resistance RA105 and resistance RA106 form anti-phase scaling circuit, multiplication factor for-
3 times, Ui_REF voltage range is -7.5V to 0；UA105B, resistance RA107, resistance RA108 and resistance RA109 form same phase
Proportional amplifier, multiplication factor are 4 times, and resistance RA339 and resistance RA340 are resistance decrement network, by in-phase proportion amplifier
Output voltage decay to original half, Uth_REF voltage range arrives 5V for 0.Can by adjusting proportion resistor,
Flexibly change Ui_REF and Uth_REF scope, to be suitable for use with the needs of condition.
UA301, electric capacity CA310, electric capacity CA306, resistance RA306, resistance RA307, electric capacity CA303, resistance RA304, electricity
Hinder RA331, resistance RA382, transistor QA303, resistance RA314, power field effect pipe QB305, resistance RA324, resistance
RA322, resistance RA326, resistance RA328, resistance RA332, resistance RA313, electric capacity CA311, resistance RA321, resistance RB331 ,+
15V and -15V composition digital-control constant-flow sources, wherein RA324 is high-power accurate noninductive resistance, and resistance is 0.1 ohm, rated power
RA324 is depended on for 3W, precision 1%, temperature drift 20ppm, the precision of electric current, output current size arrives 3A for 0.
UB305 is comparator chip LM393, uses dual power supply+15V and -15V to be powered for UB305 comparators, input voltage
Uth_REF, UB305, UA301A ,+15V and -15V supply voltages, resistance RB337, electric capacity CA319, resistance RB335, resistance
RB339, transistor QB301, electric capacity CB317, resistance RB331, resistance RA321, electric capacity CA303, resistance RA304, resistance
RA382, transistor QA303, resistance RA314, resistance RA311 composition cut-in voltages set circuit, when UA301A No. 1 pin is defeated
When going out voltage and being less than Uth_REF, transistor QB301 mornings BE knot conductings, electric current flows to colelctor electrode from emitter stage, its emitter stage electricity
It is negative to press, and electric capacity CA303 chargings cause UA301 No. 1 pin voltage to raise, and when voltage is increased to more than Uth_REF, compare
Device output end open collector, causes transistor BE knot cut-offs, and transistor QB301 grounded emitter, electric capacity CA303 stops immediately
Only charge, so UA301 No. 1 pin output voltage is equal to Uth_REF, the grid voltage of power field effect pipe is Uth_REF
Transistor QA301 BE junction voltages are subtracted, realize the pretreatment to power field effect pipe grid voltage.
The embodiment of the simply present invention described in description above, various illustrations are not to the reality of the present invention
Matter Composition of contents limits, and person of an ordinary skill in the technical field can be to described in the past specific after specification has been read
Embodiment is made an amendment or deformed, without departing from the spirit and scope of the invention.
Claims (9)
- A kind of 1. numerical control constant-current source device with cut-in voltage preprocessing function, it is characterised in that：Including microprocessor unit MCU, control unit FPGA, D/A conversion unit DAC1, D/A conversion unit DAC2, in-phase proportion amplifier unit, anti-phase ratio Example amplifier unit, error amplifier block, expand current circuit unit, cut-in voltage setting unit, difference channel unit, power field Effect pipe unit, voltage source VCC, range resistance and load；Microprocessor unit MCU is connected to control unit FPGA, and control is single First FPGA is connected to D/A conversion unit DAC1 and D/A conversion unit DAC2；D/A conversion unit DAC1 is connected to in-phase proportion Amplifier unit, in-phase proportion amplifier unit are connected to error amplifier block, and error amplifier block is connected to expansion stream electricity The input of road unit, the output end for expanding current circuit unit are connected to the grid of fet power pipe, the leakage of fet power pipe Voltage source VCC is met in succession, and the source electrode of FET is connected to range resistance Rs one end, and the range resistance Rs other end is connected to RL is loaded, loads RL other end ground connection, the in-phase input end connection range resistance Rs of differential amplification unit one end and field The source electrode of effect pipe, the inverting input of error amplifier are connected with one end of the range resistance Rs other end and load RL, The output end of error amplifier block is connected to the another way input of error amplifier；D/A conversion unit DAC2 output end The input of in-phase amplifier unit is connected to, the output end of in-phase amplifier unit is connected to the defeated of cut-in voltage setting unit Enter end, the output end of cut-in voltage setting unit is connected to the output end of error amplifier block and expands the input of current circuit unit End.
- 2. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 1, it is characterised in that：It is described Microprocessor unit MCU be connected with control unit FPGA, realize the communication between microprocessor unit and FPGA unit；Its In, described microprocessor unit is connected with host computer, receives the control instruction that host computer is sent；Described control unit FPGA leads to Cross synchronous serial communication bus SPI1 connection serial input D/A conversion unit DAC1 and D/A conversion unit DAC2, digital-to-analogue conversion Cells D AC1 output connects anti-phase proportional amplifier unit, D/A conversion unit DAC1 and D/A conversion unit DAC2 output Voltage realizes conversion of the digital quantity to analog quantity to be all positive voltage.
- 3. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 1, it is characterised in that：It is described D/A conversion unit DAC1 output is connected to the input of anti-phase proportional amplifier unit, anti-phase proportional amplifier unit it is defeated Go out the input all the way that end is connected to error amplifier block, the input reference voltage as digital-control constant-flow source；Error amplifier Unit, expand current circuit unit, power field effect pipe, range resistance Rs, error amplifier block one profound and negative feedbck electricity of composition Road；The intensity of reference voltage adjustable current source device output current.
- 4. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 1, it is characterised in that：It is described D/A conversion unit DAC2 output is connected to the input of in-phase proportion amplifier unit, in-phase proportion amplifier unit it is defeated Go out the input that end is connected to cut-in voltage setting unit, the output voltage of in-phase proportion amplifier unit is set as cut-in voltage Put the reference voltage of unit, the output end and expansion current circuit of the output end connection error amplifier block of cut-in voltage setting unit The input of unit, realize the grid voltage pretreatment to power field effect pipe.
- 5. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 1, it is characterised in that：It is described Cut-in voltage sets circuit unit to realize that the pretreatment of fet gate voltage is set with error amplifier block cooperation.
- 6. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 5, it is characterised in that：It is described Cut-in voltage sets circuit unit to include comparator U1, operational amplifier U2 ,+15V supply voltages and -15V supply voltages, resistance R1~R10, electric capacity C1~C6, PNP transistor Q1, NPN transistor Q2 and fet power pipe Q3；D/A conversion unit DAC2 output is connected to comparator U1 reversed-phase output, and the positive voltage that+15V supply voltages are connected to comparator U1 is defeated Enter pin and electric capacity C1 one end, electric capacity C1 other end ground connection, -15V supply voltages be connected to comparator grounding pin and Electric capacity C2 one end, electric capacity C2 other end ground connection, the output end connection resistance R1 of comparator one end；The resistance R1 other end The one end, electric capacity C5 one end and the base stage of PNP transistor of one end, resistance R3 with resistance R2, resistance R1 the other end connection+ 15V supply voltages, resistance R2 the other end ground connection, electric capacity C5 the other end ground connection, PNP transistor Q1 colelctor electrode connection- 15V supply voltages, emitter stage connection resistance R4 one end and resistance R5 one end of PNP transistor, the resistance R4 other end Ground connection；Resistance R5 other end concatenation operation amplifier U2 inverting input and electric capacity C6 one end, the electric capacity C6 other end Connect resistance R8 one end, the resistance R8 other end concatenation operation amplifier U2 output end, the base stage of NPN transistor and ratio Compared with device U1 in-phase input end, operational amplifier U2 in-phase input end connection balance resistance R9, the balance resistance R9 other end Ground connection, operational amplifier U2 positive supply input pin connection+15V supply voltages and electric capacity C3 one end, electric capacity C3's is another End ground connection, operational amplifier U2 negative supply input pin connection -15V power supplys and electric capacity C3 one end, the electric capacity C3 other end Ground connection；NPN transistor Q2 colelctor electrode connection+15V supply voltages, NPN transistor Q2 emitter stage connection resistance R10's One end and power field effect pipe Q3 grid, resistance R10 other end ground connection, power field effect pipe Q3 drain electrode connection power supply VCC, power field effect pipe Q3 source electrode connection range resistance Rs one end, the one of range resistance Rs other end connection load RL End, load RL other end ground connection.
- 7. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 6, it is characterised in that：When than Compared with device U1 use+15V and -15V supply voltages, comparator U1 anti-phase input terminal voltage is higher than comparator U1 in-phase input ends electricity During pressure, the voltage of comparator U1 output ends is -15V supply voltages, and this -15V supply voltage drags down PNP transistor Q2 base stage Voltage so that PNP transistor Q2 saturation conductions, PNP transistor Q2 colelctor electrode -15V supply voltages pass through conducting channel Resistance R4 and resistance R5 one end are connected to, the circuit using operational amplifier U2 as core, resistance R5, resistance R8, resistance R9, electricity Hold C6 ,+15V supply voltages, -15V supply voltages and form a profound and negative feedbck circuit, empty short conditional is set up, operational amplifier U2 homophase input terminal potential is equal with its anti-phase input terminal potential, realizes virtual earth.
- 8. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 6, it is characterised in that：When than When anti-phase input terminal voltage compared with device U1 is higher than comparator U1 homophase input terminal voltages, -15V supply voltages pass through R50 pairs of resistance Electric capacity C6 is charged, cause operational amplifier U2 output end voltages rise, when operational amplifier U2 output end voltages be higher than than During anti-phase input terminal voltage compared with device U2, PNP transistor Q2 transistor cutoffs, when operational amplifier U2 output end voltages stop Rise, then the output voltage of U2 operational amplifiers is equal to the input reference voltage of open circuit setting unit, realizes to power The setting of FET initial gate voltage.
- 9. there is the numerical control constant-current source device of cut-in voltage preprocessing function as claimed in claim 8, it is characterised in that：Power The initial voltage of FET subtracts the base stage and hair of NPN transistor equal to the input reference voltage of open circuit setting unit Junction voltage between emitter-base bandgap grading.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888055A (en) * | 2017-11-27 | 2018-04-06 | 常州同惠电子股份有限公司 | Improve the drive circuit realization device of power tube dynamic property |
| CN117559922A (en) * | 2024-01-10 | 2024-02-13 | 成都威频通讯技术有限公司 | Amplifier dynamic current constant measurement and control circuit based on AD/DA |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000122732A (en) * | 1998-10-19 | 2000-04-28 | Ando Electric Co Ltd | Programmed power supply device |
| EP1445678A1 (en) * | 2003-02-05 | 2004-08-11 | Agilent Technologies, Inc. - a Delaware corporation - | Voltage to current converter |
| CN201788434U (en) * | 2009-10-19 | 2011-04-06 | 株洲南车时代电气股份有限公司 | Multipath bidirectional digital controlled constant current source |
| CN103034274A (en) * | 2012-12-12 | 2013-04-10 | 常州大学 | Constant-current source for temperature measuring circuit |
| CN205450860U (en) * | 2016-03-16 | 2016-08-10 | 深圳市比特原子科技有限公司 | Constant -current source circuit with adjustable it is small -size |
-
2017
- 2017-08-09 CN CN201710675584.6A patent/CN107340795B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000122732A (en) * | 1998-10-19 | 2000-04-28 | Ando Electric Co Ltd | Programmed power supply device |
| EP1445678A1 (en) * | 2003-02-05 | 2004-08-11 | Agilent Technologies, Inc. - a Delaware corporation - | Voltage to current converter |
| CN201788434U (en) * | 2009-10-19 | 2011-04-06 | 株洲南车时代电气股份有限公司 | Multipath bidirectional digital controlled constant current source |
| CN103034274A (en) * | 2012-12-12 | 2013-04-10 | 常州大学 | Constant-current source for temperature measuring circuit |
| CN205450860U (en) * | 2016-03-16 | 2016-08-10 | 深圳市比特原子科技有限公司 | Constant -current source circuit with adjustable it is small -size |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888055A (en) * | 2017-11-27 | 2018-04-06 | 常州同惠电子股份有限公司 | Improve the drive circuit realization device of power tube dynamic property |
| CN117559922A (en) * | 2024-01-10 | 2024-02-13 | 成都威频通讯技术有限公司 | Amplifier dynamic current constant measurement and control circuit based on AD/DA |
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| CN107340795B (en) | 2019-08-30 |
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