CN110531820A - A kind of isolated digital-control constant-flow source module - Google Patents
A kind of isolated digital-control constant-flow source module Download PDFInfo
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- CN110531820A CN110531820A CN201910952222.6A CN201910952222A CN110531820A CN 110531820 A CN110531820 A CN 110531820A CN 201910952222 A CN201910952222 A CN 201910952222A CN 110531820 A CN110531820 A CN 110531820A
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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
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Abstract
The present invention relates to a kind of isolated digital-control constant-flow source modules, belong to signal-isolated transmission technical field.The present invention includes digital signal isolated location, low level signal amplification unit, core processing unit, electric current adjustment voltage regulation unit and sampling unit；Digital signal isolated location is responsible for source device and the digital communi- cations link of isolated digital-control constant-flow source module of the present invention carrying out electrical isolation；Low level signal amplification unit amplifies sampled signal；Core processing unit is responsible for output pwm signal to control electric current adjustment voltage regulation unit and generate the electric current to match with setting value；Electric current adjusts voltage regulation unit and steals energy from target device and adjust the electric current of return target device；Sampling unit samples the electric current for returning to target device；Signal isolation circuit of the present invention and transmitter can be worked normally without independent power supply, and circuit structure is simple, is easily integrated, easy to produce.
Description
Technical field
It is related to signal isolation field, in particular to a kind of isolated digital-control constant-flow source module.
Background technique
The case where current many industry spots are directed to using 4 ~ 20mA DC current, and many laboratories also can
The case where being related to using constant-current source, and the equipment used does not have the fan-out capability of 4 ~ 20mA signal, needs external dedicated
D/A module, controlled by way of digital communication D/A module generate need electric current；And signal isolator currently on the market
Generally existing following problem:
1. not having isolation features；
2. wiring is complicated, volume is big, is unfavorable for integrating；
3. cost performance is relatively low.
Summary of the invention
The present invention is directed to problem above of the existing technology, and proposing a kind of common low price component can be used to realize
Isolated digital-control constant-flow source module effectively improves the cost performance of similar product, and its circuit only takes up the PCB surface product of very little,
It is especially advantageous for integrating.
In order to reach the goals above, it present invention employs technical solution as shown in Figure 1 and Figure 2, is described as follows:
A kind of isolated digital-control constant-flow source module comprising:
Digital signal isolated location, low level signal amplification unit, core processing unit, electric current adjustment voltage regulation unit and sampling unit.
The digital signal isolated location is responsible for that the digital communication signal of source device and core processing unit is isolated.
The source device, which refers to, sends setting electricity to isolated digital-control constant-flow source module of the present invention by digital signal
The equipment of flow valuve, similarly hereinafter.
The electric current adjustment voltage regulation unit is responsible for stealing energy from target device and realizes that pressure stabilizing exports, to be entire permanent
The isolation back-end circuit of current source circuit is powered, and voltage output end is connected to digital signal isolated location, core processing list and small
The corresponding power port of signal amplification unit；The electric current adjustment voltage regulation unit is also responsible for according to core processing unit offer
Pwm signal adjusts the electric current drawn from target device, the corresponding output end of pwm signal input termination core processing unit.
The isolation back-end circuit refers to using isolating device as separation, isolating device to target device voltage output port
All circuits between input end of analog signal mouth, similarly hereinafter.
The sum of the minimum running current of the isolation back-end circuit is isolated digital-control constant-flow source mould of the present invention
The minimum output current of the maximum allowable operating current of block and isolated digital-control constant-flow source module of the present invention, target
The required minimum effective current value of equipment should be not less than this minimum output current.
The target device refers to the equipment for receiving the analog signal of carrying data, similarly hereinafter.
The low level signal amplification unit is responsible for amplifying the sampled voltage of the small signal of input, amplified signal output
Terminate the input end of analog signal of core processing unit.
The core processing unit includes at least 1 input end of analog signal, 1 pwm signal output end and 1 group of number letter
Signal communication port is responsible for being converted to the digital signal received from digital signal isolated location into corresponding pwm signal, and root
The duty ratio of pwm signal is adjusted according to the analog voltage signal of low level signal amplification unit output and the temperature sensor data of inside,
To achieve the purpose that stablize output setting electric current.
The sampling unit is responsible for sampling the electric current for flowing through entire isolation back-end circuit, and sampled signal is exported
To the respective input of low level signal amplification unit.
Beneficial effects of the present invention
1) component used in utilization isolated numerical control constant current module described in the invention is cheap, quantity is few, and has
Small package form, is so just greatly saved cost and space, convenient for miniaturization, it is integrated.
2) isolated numerical control constant current module described in the invention is, it can be achieved that the isolation of digital signal to analog signal passes
It is defeated, and it does not need individual power supply.
3) outlet side of isolated numerical control constant current module described in the invention seals in mesh in a manner of two-wire system electric current loop
It between the power channel and signal sampling channel of marking device, is highly convenient for installing, and its pressure drop generated is very low, that is, electricity
Press the scope of application wider.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, moreover it is possible to root
Other attached drawings are obtained according to these attached drawings.
Fig. 1: for the functional block diagram and application note block diagram of isolated digital-control constant-flow source module of the present invention；
Fig. 2: for the top layer circuit diagram of isolated digital-control constant-flow source module of the present invention；
Fig. 3: for the circuit diagram of digital signal isolated location of the present invention；
Fig. 4: for the circuit diagram of low level signal amplification unit of the present invention；
Fig. 5: for the circuit diagram of core processing unit of the present invention；
Fig. 6: the circuit diagram of voltage regulation unit is adjusted for electric current of the present invention；
Fig. 7: for the circuit diagram of sampling unit of the present invention；
Fig. 8: for signal converting transmission flow chart of the present invention；
Wherein:
Solid arrow in Fig. 1 illustrates electric current flowing, the flowing of dotted line arrow signal, and dotted line frame represents external equipment；
In Fig. 1, source device refers to the equipment for sending the signal of carrying data, and target device refers to setting for the signal for receiving carrying data
It is standby.
Specific embodiment
Detailed content and technology about the invention illustrate, are now described further with embodiment, it will be appreciated that
, these embodiments are only and to be not necessarily to be construed as the limitation of the invention implementation for illustrating.
A kind of functional block diagram and application note block diagram of isolated digital-control constant-flow source module with reference to shown in Fig. 1, including number
Signal isolation unit, electric current adjustment voltage regulation unit, low level signal amplification unit, core processing unit and sampling unit.
As shown in Figure 1, entirely isolation back-end circuit is serially connected with the power end of target device and AI signal input part, target are set
It is standby that electric current Iout required for isolation back-end circuit works, current path are as follows: electric current Iout first passes around the electricity are provided
Stream adjustment voltage regulation unit, electric current adjustment voltage regulation unit can generate two fixed voltages Uc and Ud, and wherein Uc is to maintain digital letter
The work of number isolated location, size need to meet the operating voltage requirement of the digital signal isolated location；The fixed voltage
Work of the Ud to maintain core processing unit and low level signal amplification unit, size need to meet the core processing unit and small
The operating voltage requirement of signal amplification unit；The AI signal that electric current Iout most flows back to target device through the sampling unit afterwards is defeated
Enter end, and generating the sampled voltage UA, UA of a voltage value very little on sampling unit is one in a linear relationship with Iout
Negative pressure characteristic is presented relative to the Ud in voltage, is that the feedback sources of isolated digital-control constant-flow source module of the present invention are believed
Number.
The signal link of isolated digital-control constant-flow source module of the present invention are as follows: source device output is loaded with setting electric current number
Be transmitted to core processing unit through digital signal isolated location according to the digital signal of IdataS, the core processing unit according to
IdataS generates the pwm signal of corresponding duty ratio, adjusts the electricity drawn from target device to control electric current adjustment voltage regulation unit
Iout is flowed, and the sampled voltage UA linear with Iout is also changed correspondingly, then the low level signal amplification list
The negative pressure sampled signal UA is changed into positive pressure and amplified by member, and amplified signal XUA, which is sent, adjusts pressure stabilizing in electric current
Unit constitutes hardware negative feedback path, while sending and being AD converted in core processing unit；The core processing unit is by signal
XUA is converted into corresponding digital value DA0, and according to the linear calibration curve of internal temperature sensor temperature collected and setting
Temperature-compensating and linear amendment are carried out to DA0, obtain revised digital value DA, and be compared according to setting value IdataS
Result adjustment pwm signal duty ratio, and then adjusting the electric current Iout so in cycles can make Iout value steady
Fixed matches with setting value IdataS, has also just achieved the purpose that generate corresponding electric current with Digital Signals constant-current source, because
Source device output digital signal and target device without direct electric connecting relation, therefore also just reached with digital signal every
From the purpose that control constant-current source generates corresponding electric current；
For ease of understanding, this place is illustrated the present invention using one embodiment, and circuit structure has used stratification to set
Meter, is divided into two layers for a whole set of circuit: top layer and bottom.Top layer circuit define each subelement circuit interface and each interface it
Between joining relation, bottom then carried out interior design to each subelement circuit respectively.
Embodiment: a kind of top layer circuit diagram of isolated digital-control constant-flow source module shown in Fig. 2 is referred to comprising number
Word signal isolation unit, low level signal amplification unit, core processing unit, electric current adjustment voltage regulation unit and sampling unit, description is such as
Under:
The port GND1 of the digital signal isolated location, the port GND of core processing unit, low level signal amplification unit GND
The port GND that port, electric current adjust voltage regulation unit is connected together with the port Iin of sampling unit, and the electric current adjusts pressure stabilizing
The port Vin of unit is connected to the power supply output cathode port of target device, and the port VCC is connected to digital signal isolated location
The port VCC1, vdd terminal mouth are connected to the vdd terminal mouth of core processing unit and the vdd terminal mouth of low level signal amplification unit, and the port vf connects
It is connected to the port AFIN of core processing unit and the port AFOUT of low level signal amplification unit, the port PWMDA is connected to core processing
The port PWMOUT of unit；The port RX and the port TX of the core processing unit are connected respectively to digital signal isolated location
The port ROUT and the port TIN；The port AFIN of the low level signal amplification unit and the port the IOUT connection of the sampling unit
To the input end of analog signal mouth of target device.
Supply voltage provided by the target device need to be less than the maximum that electric current adjustment voltage regulation unit can bear
Voltage, and it is more than or equal to its internal sample resistance, the electric current adjustment the sum of voltage regulation unit and the full scale pressure drop of sampling unit,
Such as: the internal sample resistance of the target device is 100 Europe, and sampling unit internal resistance is 5 Europe, and Full-span output electric current is
20mA, then full scale pressure drop is 2.1V, it is assumed that electric current adjusts the minimum 3V of full scale pressure drop of voltage regulation unit, the maximum that can be born
Voltage is 24V, then supply voltage provided by target device should be between 5.1V ~ 24V.
Bottom circuit is described as follows:
The digital signal isolated location is made of isolating chip U1g, resistance R1g, capacitor C1g ~ C2g and diode D1g；Externally
Connectivity port includes: by the first power input port VCC1, sends input port TXIN, reception output port RXOUT and first
Public port GND1 composition digital communications ports group first and by second source input port VCC2, send output port TXOUT,
Receive the digital communications ports group second of input port RXIN and the second public port GND2 composition.
1 foot of the isolating chip U1g meets the first power input port VCC1, and 2 feet receive output port RXOUT, 3 feet
Input port TIN is received and sent, 4 feet meet the first public port GND1, and 5 feet meet the second public port GND2, and 6 feet receive and send output end
Mouth TOUT, 7 feet receive input port RIN, and 8 feet meet second source input port VCC2；The anode of the diode D1g connects
Receiving end input port RIN, cathode connect 8 feet of the new U1g of isolation；The capacitor C2g is connected to 5 feet and 8 feet of isolating chip U1g
Between；The capacitor C1g is connected between 1 foot of isolating chip U1g and 4 feet；The resistance R1g is connected to 1 foot of isolating chip U1g
Between 3 feet.
The model of the isolating chip U1g are as follows: π 122U31.
Digital communications ports second in the digital signal isolated location uses the mode or independent confession of signal wire stealing
The mode of electricity obtains energy, so that circuit corresponding inside the digital signal isolated location works normally, is stolen using signal wire
When the mode of electricity, it is desirable that the digital signal source device being attached thereto can provide suitable voltage and electricity on corresponding signal wire
Stream；
The low level signal amplification unit is made of amplifier U1f, capacitor C1f ~ C2f and resistance R1f ~ R2f；External connection port packet
It includes: power input anode port VDD, public port GND, small signal input port AFIN and amplified signal output port AFOUT.
1 foot and 2 feet of the amplifier U1f meets public port GND, and 3 feet connect small signal input port through resistance R1f
AFIN, 4 feet meet amplified signal output port AFOUT through resistance, and 5 feet meet positive pole port VDD；Capacitor C2f is connected to amplifier
Between 2 feet and 5 feet of U1f；Resistance R2f is in parallel with capacitor C1f to be followed by between 3 feet and 4 feet of amplifier U1f.
The amplifier U1f needs that the level in small signal input port AFIN can be worked normally than power supply negative terminal mouth VS-
The low situation of level, the present embodiment uses the accurate low pressure amplifier of model TP5531U-CR.
The core processing unit is made of microprocessor U1h, capacitor C1h ~ C3h and resistance R1h ~ R2h；External connection end
Mouth includes: positive pole port VDD, public port GND, input end of analog signal mouth AFIN, pwm signal output port
PWMOUT, Uart send signal port TX and Uart and receive signal port RX.
1 foot of the microprocessor U1h meets public port GND through resistance R1h, and 4 foot meridian capacitor C1h meet public port GND,
5 feet meet pwm signal output port PWMOUT, and 7 feet are connected to input end of analog signal mouth AFIN through resistance R2h, and 9 feet connect common end
Mouth GND, 10 feet meet positive pole port VDD, and 11 feet meet Uart and send signal port TX, and 12 feet meet Uart and receive signal port
RX；Capacitor C2h is connected between 7 feet and 9 feet of the microprocessor U1h；Capacitor C3h is connected to 10 feet of the microprocessor U1h
And 9 between foot.
The microprocessor U1h uses the low-power scm of model STM32L011.
Core processing unit of the present invention should have the function of Uart asynchronous communication, AD sampling functions, PWM output function,
Temperature detecting function and parameter store function, because microprocessor employed in the present embodiment has an all of the above function, therefore institute
Stating core processing unit in the example of the present invention is only periphery electricity necessary to a piece of microprocessor chip and its completion work
Road.
The electric current adjustment voltage regulation unit is by amplifier U1t, linear series source of stable pressure U2t, parallel voltage-stabilizing source U3t, resistance
R1t ~ R6t, capacitor C1t ~ C8t and P-MOS pipe Q1t composition；External connection port includes: power input anode port Vin, power supply
Export first port VCC, power supply exports second port VDD, feedback signal input port Vf, PWM current modifying signal input terminal
Mouth PWMDA and public port GND.
The power input pin Vin of the linear stable U2t meets power input anode port Vin, and common pin GND connects
Public port GND, power supply output pin Vout connect the source electrode and amplifier U1t of power supply output first port VCC, P-MOS pipe Q1t
5 feet；1 foot of the amplifier U1t is connected to feedback signal input port Vf through resistance R7t, and 2 feet connect public port GND, 3 feet
It is followed by PWM current modifying signal input port PWMDA through resistance R1f, R2f and R3f series connection, 4 feet connect the control of P-MOS pipe Q1t
Pole；The drain electrode of the P-MOS pipe Q1t connects the cathode of power supply output second port VDD and parallel voltage-stabilizing source U3t；It is described in parallel steady
The anode of potential source U3t meets public port GND；The resistance R4t is connected between the source electrode and drain electrode of P-MOS pipe Q1t；The electricity
Resistance R5t is connected to the cathode of parallel voltage-stabilizing source U3t and with reference between pole；The resistance R6t is connected to the sun of parallel voltage-stabilizing source U3t
Between pole and reference pole；The capacitor C1t is connected to the power input foot Vin and common pin GND of linear series source of stable pressure U1t
Between；The capacitor C2t is connected between 3 feet of amplifier U2t and 4 feet；The capacitor C3t is connected to linear series source of stable pressure
Between the power supply output pin Vout and common pin GND of U1t；The capacitor C4t is connected between 3 feet of amplifier and 2 feet；Institute
Capacitor C5t is stated to be connected between the node and public port GND of resistance R1t and R2t；The capacitor C6t be connected to resistance R3t with
Between the node and public port GND of R2t；The capacitor C7t is connected to the cathode and public port GND of parallel voltage-stabilizing source U3t
Between；The capacitor C8t is connected between 1 foot of amplifier and 2 feet.
The pressure voltage of the linear series source of stable pressure U2t is answered as big as possible, and minimum pressure drop is answered as small as possible, and the present embodiment is adopted
Model HT7550.
The maximum allowable of the parallel voltage-stabilizing source U3t should be not less than isolated digital-control constant-flow source of the present invention by electric current
The Full-span output electric current that module allows, it is as small as possible that minimum pressure stabilizing maintains electric current to answer, and the present embodiment is using model AZ432's
Accurate voltage stabilizing chip.
The sampling unit is made of resistance R1y and capacitor C1y；External connection port include current input terminal mouth IIN and
Current output terminal mouth IOUT.
The resistance R1y and capacitor C1y parallel connection are followed by between current input terminal mouth IIN and current output terminal mouth IOUT.
The resistance R1y floats resistance using High Precision Low Temperature, and resistance value should be far smaller than the electricity in low level signal amplification unit
Hinder R1f.
The working principle of the invention:
V/I translation circuit is constituted using double operational, wherein first amplifier A1 builds matrix current adjustment circuit, second amplifier A2 is taken
Build negative pressure feedback circuit；The external digital signal with setting electric current value IdataS is received using microprocessor and is converted into corresponding
Pwm signal, make the pwm signal by the way that corresponding reference voltage signal Vdata1, V/I transformation can be generated after low-pass filter
First amplifier and match circuit in circuit constitute matrix current adjustment circuit, are generated according to reference voltage signal Vdata1 corresponding
Current signal Idata1 along with the consumption electric current Idata0 of entire circuit itself be the total current for flowing through the circuit
Idata, i.e. Idata=Idata0+Idata1.
Then under by sampling resistor R1y as common end, that is, in the other end generation negative pressure of sampling resistor, in this way
It can ensure that electric current all in circuit, that is, Idata almost all flow through sampling resistor, a voltage value will be generated very
Small feedback signal Vf(its relative to common end be in negative polarity), which is far longer than sampling resistor R1y's by one
The negative input end that resistance R1f is connected to second amplifier A2 makes it amplify N times, obtains feedback voltage V af, and be sent to microprocessor
It is AD converted, obtains corresponding voltage digital value Vdataf, microprocessor calculates corresponding electric current further according to Vdataf
Idataf, formula are as follows: Idataf=k*Vdataf+b, wherein k, b are the linear coefficient calibrated in advance.
The circuit diagram of complex chart 4 and Fig. 7 can see, the whole sampled resistance R1y of the entire electric current that back-end circuit is isolated
Target device is flowed back to feedback resistance R1f, and R1f is far smaller than R1y, so the electric current for flowing through R1y is negligible, just has
Idataf=Idata0+Idata1；And Idata1 be controlled by microprocessor, Gu as long as the control flow according to Fig. 8 writes phase
The microprocessor program answered enables microprocessor calculate the value of Idataf in real time, and the duty of PWM is adjusted according to the value of Idataf
Than, and then adjusting Idata1, it is ensured that Idataf=IdataS can realize the mesh using Digital Signals output constant current
's.
Further, it because itself operating current of isolation back-end circuit also flows through sampling resistor R1y, can be supervised in real time
Survey, it is solid be entirely isolated back-end circuit can the mode of electric current loop seal in the corresponding sampling channel of target device, use target
The power supply of equipment can so realize the more friendly mode of connection and matching range without individually setting power interface.
Further, it is inserted in source device and the digital communi- cations link of isolated digital-control constant-flow source module of the present invention
Enter corresponding digital signal isolator, can realize isolation features, and then increase the interference free performance of module.
Claims (6)
1. a kind of isolated digital-control constant-flow source module, it is characterised in that it includes digital signal isolated location, low level signal amplification list
Member, core processing unit, electric current adjustment voltage regulation unit and sampling unit；
The digital signal isolated location is responsible for that the digital communication signal of source device and core processing unit is isolated；
The source device refers to the equipment for sending setting electric current value by digital signal；
Electric current adjustment voltage regulation unit is responsible for stealing energy from target device and realizes that pressure stabilizing exports, to for entire constant-current source
The isolation back-end circuit of circuit is powered, and voltage output end is connected to digital signal isolated location, core processing list and small signal
The corresponding power port of amplifying unit；
The electric current adjustment voltage regulation unit is also responsible for the pwm signal provided according to core processing unit adjustment and draws from target device
Electric current, pwm signal input termination core processing unit corresponding output end；
The isolation back-end circuit refers to using isolating device as separation, isolating device to target device voltage output port and mould
All circuits between quasi- signal input port；
The target device refers to the equipment for receiving the analog signal of carrying data；
The low level signal amplification unit is responsible for amplifying the sampled voltage of the small signal of input, amplified signal output termination
The input end of analog signal of core processing unit；
It is logical that the core processing unit includes at least 1 input end of analog signal, 1 pwm signal output end and 1 group of digital signal
Believe port, is responsible for the digital signal conversion received from digital signal isolated location being corresponding pwm signal, and according to small
The duty ratio of the temperature sensor data adjustment pwm signal of the analog voltage signal and inside of signal amplification unit output, to reach
To the purpose for stablizing output setting electric current；
The sampling unit is responsible for sampling the electric current for flowing through entire isolation back-end circuit, and sampled signal is output to small
The respective input of signal amplification unit.
2. isolated digital-control constant-flow source module according to claim 1, it is characterised in that the digital signal isolated location
The digital communications ports group first communicated including 1 group with core processing unit and one group of digital communications ports group communicated with source device
Second, is in electrical isolation characteristic between this two digital communications ports groups, and the low level signal amplification unit includes 1 voltage input end
Mouth, 1 public port, 1 sampled signal input mouth and 1 amplified signal output port, the core processing unit is at least
Including 1 voltage input port, 1 public port, 1 analog signal sample port, 1 pwm signal output port and 1 number
Word signal communication port set, the electric current adjustment voltage regulation unit includes 1 voltage input port, one or more voltage output ends
Mouth, 1 pwm signal input port and a public port, the sampling unit include a current input terminal mouth and an electricity
Flow output port；
The voltage input port of the electric current adjustment voltage regulation unit is connected to the power output end of target device, one or more electricity
Pressure output port is connected respectively to the corresponding electricity of the digital signal isolated location, core processing unit and low level signal amplification unit
Input terminal is pressed, pwm signal input port is connected to the pwm signal output port of the core processing unit；All units
Public port be connected with the current input terminal mouth of the sampling unit；Current output terminal mouth and the target of the sampling unit are set
Standby input end of analog signal mouth is connected with the sampled signal input mouth of the low level signal amplification unit；The low level signal amplification
The amplified signal output port of unit is connected with the analog signal sample port of the core processing unit；The core processing list
The digital communications ports group of member is connected with the digital communications ports group first of digital signal isolated location one-to-one correspondence；The number
The digital communications ports group second of word signal isolation unit digital communications ports group corresponding with digital signal source device corresponds
It is connected.
3. isolated digital-control constant-flow source module according to claim 2, it is characterised in that its minimum output current is signal
The minimum running current of converting unit is isolated, maximum output current is the maximum value of its output range, and target device is corresponding
Power output end signal isolation converting unit should be able to be provided needed for maximum output current, and the minimum value of output range is answered
Not less than the minimum output current of signal isolation converting unit.
4. isolated digital-control constant-flow source module according to claim 3, it is characterised in that the core processing unit should have
There are AD sampling functions, PWM output function, temperature detecting function, corresponding digital communication functions and parameter store function, and necessary
Include a piece of microprocessor chip.
5. isolated digital-control constant-flow source module according to claim 4, it is characterised in that the digital signal isolated location
In the digital communications ports second that is connected with digital signal source device use the mode or independently-powered mode of signal wire stealing
Energy is obtained, so that circuit corresponding inside the digital signal isolated location works normally, uses the mode of signal wire stealing
When, it is desirable that the digital signal source device being attached thereto can provide suitable voltage and current on corresponding signal wire.
6. isolated digital-control constant-flow source module according to claim 5, it is characterised in that the electric current adjusts pressure stabilizing list
Member is by amplifier U1t, linear series source of stable pressure U2t, parallel voltage-stabilizing source U3t, resistance R1t ~ R6t, capacitor C1t ~ C8t and P-MOS
Pipe Q1t composition；External connection port includes: power input anode port Vin, power supply output first port VCC, power supply output the
Two-port netwerk VDD, feedback signal input port Vf, PWM current modifying signal input port PWMDA and public port GND；
The power input pin Vin of the linear stable U2t meets power input anode port Vin, and common pin GND connects public
Port GND, power supply output pin Vout connect power supply output first port VCC, P-MOS pipe Q1t source electrode and amplifier U1t 5
Foot；1 foot of the amplifier U1t is connected to feedback signal input port Vf through resistance R7t, and 2 feet meet public port GND, and 3 feet are through electricity
Resistance R1f, R2f and R3f series connection is followed by PWM current modifying signal input port PWMDA, and 4 feet connect the control electrode of P-MOS pipe Q1t；Institute
The drain electrode for stating P-MOS pipe Q1t connects the cathode of power supply output second port VDD and parallel voltage-stabilizing source U3t；The parallel voltage-stabilizing source
The anode of U3t meets public port GND；The resistance R4t is connected between the source electrode and drain electrode of P-MOS pipe Q1t；The resistance
R5t is connected to the cathode of parallel voltage-stabilizing source U3t and with reference between pole；The resistance R6t is connected to the anode of parallel voltage-stabilizing source U3t
Between reference pole；The capacitor C1t be connected to linear series source of stable pressure U1t power input foot Vin and common pin GND it
Between；The capacitor C2t is connected between 3 feet of amplifier U2t and 4 feet；The capacitor C3t is connected to linear series source of stable pressure
Between the power supply output pin Vout and common pin GND of U1t；The capacitor C4t is connected between 3 feet of amplifier and 2 feet；Institute
Capacitor C5t is stated to be connected between the node and public port GND of resistance R1t and R2t；The capacitor C6t be connected to resistance R3t with
Between the node and public port GND of R2t；The capacitor C7t is connected to the cathode and public port GND of parallel voltage-stabilizing source U3t
Between；The capacitor C8t is connected between 1 foot of amplifier and 2 feet；
The model HT7550 of the linear series source of stable pressure U2t；
The model AZ432 of the parallel voltage-stabilizing source U3t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952222.6A CN110531820A (en) | 2019-10-09 | 2019-10-09 | A kind of isolated digital-control constant-flow source module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952222.6A CN110531820A (en) | 2019-10-09 | 2019-10-09 | A kind of isolated digital-control constant-flow source module |
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| Publication Number | Publication Date |
|---|---|
| CN110531820A true CN110531820A (en) | 2019-12-03 |
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| CN201910952222.6A Pending CN110531820A (en) | 2019-10-09 | 2019-10-09 | A kind of isolated digital-control constant-flow source module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580587A (en) * | 2020-05-22 | 2020-08-25 | 西安微电子技术研究所 | Pulse width modulation type constant current source circuit |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580587A (en) * | 2020-05-22 | 2020-08-25 | 西安微电子技术研究所 | Pulse width modulation type constant current source circuit |
| CN111580587B (en) * | 2020-05-22 | 2021-12-21 | 西安微电子技术研究所 | Pulse width modulation type constant current source circuit |
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