CN209460666U - Voltage controlled current source output circuit - Google Patents
Voltage controlled current source output circuit Download PDFInfo
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- CN209460666U CN209460666U CN201822140565.6U CN201822140565U CN209460666U CN 209460666 U CN209460666 U CN 209460666U CN 201822140565 U CN201822140565 U CN 201822140565U CN 209460666 U CN209460666 U CN 209460666U
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Abstract
The utility model relates to a kind of voltage controlled current source output circuits, including control system digital circuit, first isolating device, D/A device, voltage/current conversion module, load, current/voltage-converted module, A/D device and the second isolating device, the output end of the control system digital circuit is connected to first isolating device, first isolating device is connected to the input terminal of the D/A device, the output end of the D/A device is connected to the input terminal of the voltage/current conversion module, the output end of the voltage/current conversion module is connected respectively to the input terminal of the load and the current/voltage-converted module, the output end of the current/voltage-converted module is connected to the input terminal of the A/D device, the output end of the A/D device is connected to the control by second isolating device The input terminal of system digital circuit processed.Compared with prior art, the utility model has many advantages, such as that isolation performance is good, electric current output is reliable and stable, software code is convenient for transplanting.
Description
Technical field
The utility model relates to Constant Current-Source Design fields, more particularly, to a kind of voltage controlled current source output circuit.
Background technique
In vehicle control syetem, controlled constant-current source circuit is a kind of important means for realizing magnitude of current output.To constant current
Source output carries out control and usually requires to meet two o'clock: being on the one hand required to control the output of the different magnitudes of current, i.e., according to reality
Demand exports different current values；On the other hand, it needs to carry out real-time feedback control to the current value of output, accords with real output value
It closes and is expected, it is ensured that stability.
It is controlled at present for the voltage of constant-current source output circuit, usually first converts voltage for the digital quantity of control system
Amount, then again converts voltage, thus output current.This control circuit not can guarantee control system and external mould
The isolation performance of analog quantity.In addition the magnitude of current output of traditional control system and feed circuit, generally use analog circuit, also just make
It is complex to obtain hardware device, increases the error of system, reduces control reliability.
Meanwhile DAC device for voltage-controlled link and with the interface of control device；DA is converted, it is general to select simulation
Device or dedicated DA chip, the voltage-controlled link of D/A require not enough to simplify, and the transplantability of program code is bad.Voltage is turned
The constant current output link of galvanic current；Analog device is more, and systematic error is big.
Utility model content
The purpose of this utility model is exactly to provide a kind of isolation performance to overcome the problems of the above-mentioned prior art
Good, electric current exports reliable and stable, software code convenient for the voltage controlled current source output circuit of transplanting.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of voltage controlled current source output circuit, including control system digital circuit, the first isolating device, D/A device, electricity
Pressure/current conversion module, load, current/voltage-converted module, A/D device and the second isolating device, the control system number
The output end of circuit is connected to first isolating device, and first isolating device is connected to the input terminal of the D/A device,
The output end of the D/A device is connected to the input terminal of the voltage/current conversion module, the voltage/current conversion module
Output end be connected respectively to it is described load and the current/voltage-converted module input terminal, the current/voltage-converted mould
The output end of block is connected to the input terminal of the A/D device, and the output end of the A/D device is connected by second isolating device
It is connected to the input terminal of the control system digital circuit.
Preferably, the voltage/current conversion module includes the first operational amplifier, second operational amplifier, the one or three
Pole pipe, the second triode, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th electricity
Resistance, the 16th resistance and the 17th resistance；
The inverting input terminal of first operational amplifier be connected to the 7th resistance second end and second resistance first
End, the first end of the 7th resistance are connected to the output end of the D/A device, the homophase input of first operational amplifier
End is connected to the second end of the 5th resistance and the first end of the 4th resistance, and the first end of the 5th resistance is grounded, and described first
The output end of operational amplifier is connected to the first end of the 17th resistance, and the second end of the 17th resistance is connected to the one or three
The base stage of the base stage of pole pipe, the first end of the 6th resistance and the second triode；
The base stage of first triode is connected to the second end of the 17th resistance, and collector connects power supply, and emitter connects
It is connected to the emitter of the second triode, the second end of the 6th resistance, the second end of second resistance, the first end of first resistor；
The base stage of second triode is connected to the second end of the 17th resistance, and collector connects power supply；
The output end of the second operational amplifier is connected to the second end of the 4th resistance and the first end of the 16th resistance,
The inverting input terminal of the second operational amplifier is connected to the second end of the 16th resistance, the second operational amplifier it is same
Phase input terminal is connected to the first end of 3rd resistor, and the second end of the 3rd resistor is connected to second end and the institute of first resistor
State the output of voltage/current conversion module.
Preferably, the current/voltage-converted module includes third operational amplifier, the 8th resistance, the 9th resistance, the tenth
Resistance, eleventh resistor, twelfth resistor and the 15th resistance；
The first end of 8th resistance is connected to the first end of the tenth resistance, and the second end of the tenth resistance is connected to
The first end of twelfth resistor, the second end of the 8th resistance are connected to the first end of the 9th resistance, the 9th resistance
Second end is connected to the first end of eleventh resistor；
The non-inverting input terminal of the third operational amplifier is connected to the second end of eleventh resistor, inverting input terminal connection
To the second end of twelfth resistor, output end is connected to the first end of the 15th resistance, and the second end of the 15th resistance connects
It is connected to the input of A/D device.
Preferably, first isolating device and the second isolating device are all made of Magnetic isolation chip.
Preferably, the D/A device is communicated to connect by included data line and clock line and control system digital circuit.
Preferably, the A/D device is communicated to connect by included data line and clock line and control system digital circuit.
Preferably, the D/A device and A/D device use different device.
Compared with prior art, the utility model has the advantage that
1, isolation design is carried out using Magnetic isolation chip between the numerical portion of control circuit and external analog amount, in addition set
When counting PCB circuit board, carry out hollowing out processing, dual guarantee isolation effect below Magnetic isolation chip device.
2, voltage and the mutual conversion module of electric current are all made of operational amplifier circuit realization, can export stabling current value according to demand,
Also back production can be carried out to output current value, forms closed-loop control output, effectively raise the stability, reliable of control system
Property.
3, A/D device and D/A device are all made of dedicated A/D chip and dedicated D/A chip, both chips are all included
Data line and clock line facilitate chip to be communicated with the numerical control part of circuit, improve the convenience of program code transplanting.
Detailed description of the invention
Fig. 1 is the voltage controlled current source output circuit structure block diagram that the utility model is applied to vehicle control syetem；
Fig. 2 is the circuit detailed construction schematic diagram of the utility model voltage/current conversion module；
The circuit detailed construction schematic diagram of the position Fig. 3 the utility model current/voltage-converted module.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that described embodiment is a part of the embodiment of the utility model, rather than is all implemented
Example.Based on the embodiments of the present invention, those of ordinary skill in the art institute without making creative work
The every other embodiment obtained all should belong to the range of the utility model protection.
Embodiment 1
The specific reality of the voltage controlled current source output circuit shown in Figure 1 for being applied to vehicle control syetem for the utility model
Apply example, including control system digital circuit A1, first isolating device A2, D/A device A3, voltage/current conversion module A4, load
A5, current/voltage-converted modules A 6, A/D device A7 and the second isolating device A8, wherein the first isolating device model
ADuM1400, D/A device type are LTC8043, and A/D device type is AD7476ARTZ, the second isolating device model
ADuM1402。
The output end of control system digital circuit is connected to the first isolating device ADuM1400, is used for isolation control system number
Word circuit and external analog amount.First isolating device ADuM1400 is connected to D/A device LTC8043, is used for voltage digital quantity
Be converted to voltage analog.D/A device LTC8043 is connected to voltage/current conversion module, for voltage signal to be converted to electricity
Flow signal.Voltage/current conversion module is connected respectively to load and current/voltage-converted module, on the one hand exports electric current to negative
It carries, current signal is simultaneously converted into voltage signal by another aspect current/voltage-converted module acquisition output current signal.Electric current/
Voltage transformation module is connected to A/D device AD7476ARTZ, for voltage analog to be converted into voltage digital quantity.A/D device
AD7476ARTZ is connected to the second isolating device ADuM1402, the second isolating device ADuM1402 and is connected to control system number electricity
The input terminal on road, the voltage digital quantity for will convert into is fed back to control system digital circuit and carries out calculation process, with dynamic
State adjusts electric current output, to form complete closed loop feedback control.
Embodiment 2
Voltage/current conversion module is further refined on the basis of Fig. 1, referring to fig. 2, the voltage/current conversion in Fig. 1
Module includes the first operational amplifier U1, second operational amplifier U2, the first triode Q1, the second triode Q2, first resistor
R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 16th electricity
R16 and the 17th resistance R17 is hindered,
The inverting input terminal of first operational amplifier U1 be connected to the 7th resistance R7 second end and second resistance R2
One end, the first end of the 7th resistance R7 are connected to the output voltage Vin of D/A device, the homophase input of the first operational amplifier U1
End is connected to the second end of the 5th resistance R5 and the first end of the 4th resistance R4, the first end ground connection of the 5th resistance R5, the first fortune
The output end for calculating amplifier U1 is connected to the first end of the 17th resistance R17, and the second end of the 17th resistance R17 is connected to first
Triode Q1, the first end of the 6th resistance R6 and the second triode Q2；
The base stage of first triode Q1 is connected to the second end of the 17th resistance R17, and collector connects power supply ﹢ 15V, transmitting
Pole is connected to the emitter of the second triode Q2, the second end of the 6th resistance R6, the second end of second resistance R2, first resistor R1
First end；
The base stage of second triode Q2 is connected to the second end of the 17th resistance R17, and collector connects power supply -15V；
The output end of second operational amplifier U2 be connected to the 4th resistance R4 second end and the 16th resistance R16 first
End, the inverting input terminal of second operational amplifier U1 are connected to the second end of the 16th resistance R16, second operational amplifier U2's
Non-inverting input terminal is connected to the first end of 3rd resistor R3, and the second end of 3rd resistor R3 is connected to the second end of first resistor R1
With the output of voltage/current conversion module.
Wherein, second operational amplifier U2 and 3rd resistor R3, the 16th resistance R16 constitute voltage follower, so that the
The output voltage values of two operational amplifier U2 are identical as the second terminal voltage value Uo2 of first resistor R1, so operational amplifier U2
Homophase input terminal voltage value U+=Uo2× (R5+ (R4+R5)), according to the short rule U of void of amplifier+=U_And empty disconnected rule
(Vin-U_)/R7=(U_-Uo1(U can be obtained in)/R2o1-Uo2)/R1=-0.01VinTo get to output electric current and control voltage it
Between transformational relation be Iout=-0.01Vin。
Embodiment 3
Current/voltage-converted module is further refined on the basis of Fig. 1, the current/voltage-converted referring to Fig. 3, in Fig. 1
Module includes third operational amplifier U3, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the tenth
Two resistance R12, thirteenth resistor R13, the 14th resistance R14 and the 15th resistance R15,
The first end of 8th resistance R8 is connected to the first end of the tenth resistance R10, and the second end of the tenth resistance R10 connects
It is connected to the first end of twelfth resistor R12, the second end of the 8th resistance R8 is connected to the first end of the 9th resistance R9, the 9th resistance
The second end of R9 is connected to the first end of eleventh resistor R11；
The non-inverting input terminal of third operational amplifier U3 is connected to the second end of eleventh resistor R11, and inverting input terminal connects
It is connected to the second end of twelfth resistor R12, output end is connected to the first end of the 15th resistance R15, and the of the 15th resistance R15
Two ends are connected to the input of A/D device；
1 foot of third operational amplifier U3 is connected to the first end of thirteenth resistor R13, and the second of thirteenth resistor R13
End is connected to the first end of the 14th resistance R14, and 8 feet of third operational amplifier U3 are connected to the second of the 14th resistance R14
End, the 5 feet ground connection of third operational amplifier U3,4 feet of third operational amplifier U3 are connected to negative supply -15V, and third operation is put
7 feet of big device U3 are connected to positive supply+15V.
8th resistance R8 is as sampling resistor, for sampled voltage/current conversion module output current signal Iout, turn
Voltage is turned to, operational amplifier U3 enhanced processing output voltage signal V is passed throughFBIt send to the processing of A/D device.Third operational amplifier
The amplification factor of U3 is mainly determined by the external gain resistor between 1 foot and 8 feet, it can thus be concluded that third operational amplifier U3's puts
Big multiple is GU3=(49.4k Ω/(R13+R14))+1, can be obtained the output of A/D device required input voltage signal and back production
Transformational relation between current signal is VFB=GU3×R8×Iout。
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can be readily occurred in various
Equivalent modifications or substitutions, these modifications or substitutions should be covered within the scope of the utility model.Therefore, this is practical
Novel protection scope should be subject to the protection scope in claims.
Claims (7)
1. a kind of voltage controlled current source output circuit, it is characterised in that: including control system digital circuit, the first isolating device, D/A
Device, voltage/current conversion module, load, current/voltage-converted module, A/D device and the second isolating device, the control
The output end of system digital circuit is connected to first isolating device, and first isolating device is connected to the D/A device
Input terminal, the output end of the D/A device is connected to the input terminal of the voltage/current conversion module, the voltage/current
The output end of conversion module is connected respectively to the input terminal of the load and the current/voltage-converted module, the electric current/electricity
The output end of pressure conversion module is connected to the input terminal of the A/D device, the output end of the A/D device by described second every
From the input terminal that device is connected to the control system digital circuit.
2. a kind of voltage controlled current source output circuit according to claim 1, which is characterized in that the voltage/current conversion
Module includes the first operational amplifier, second operational amplifier, the first triode, the second triode, first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 16th resistance and the 17th resistance；
The inverting input terminal of first operational amplifier is connected to the second end of the 7th resistance and the first end of second resistance, institute
The first end for stating the 7th resistance is connected to the output end of the D/A device, and the non-inverting input terminal of first operational amplifier connects
It is connected to the second end of the 5th resistance and the first end of the 4th resistance, the first end ground connection of the 5th resistance, first operation
The output end of amplifier is connected to the first end of the 17th resistance, and the second end of the 17th resistance is connected to the first triode
Base stage, the first end of the 6th resistance and the base stage of the second triode；
The base stage of first triode is connected to the second end of the 17th resistance, and collector connects power supply, and emitter is connected to
The emitter of second triode, the second end of the 6th resistance, the second end of second resistance, the first end of first resistor；
The base stage of second triode is connected to the second end of the 17th resistance, and collector connects power supply；
The output end of the second operational amplifier is connected to the second end of the 4th resistance and the first end of the 16th resistance, described
The inverting input terminal of second operational amplifier is connected to the second end of the 16th resistance, the second operational amplifier it is same mutually defeated
Enter end and be connected to the first end of 3rd resistor, the second end of the 3rd resistor be connected to first resistor second end and the electricity
The output of pressure/current conversion module.
3. a kind of voltage controlled current source output circuit according to claim 1, which is characterized in that the current/voltage-converted
Module includes third operational amplifier, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor and the tenth
Five resistance；
The first end of 8th resistance is connected to the first end of the tenth resistance, and the second end of the tenth resistance is connected to the tenth
The first end of two resistance, the second end of the 8th resistance are connected to the first end of the 9th resistance, and the second of the 9th resistance
End is connected to the first end of eleventh resistor；
The non-inverting input terminal of the third operational amplifier is connected to the second end of eleventh resistor, and inverting input terminal is connected to
The second end of 12 resistance, output end are connected to the first end of the 15th resistance, and the second end of the 15th resistance is connected to
The input of A/D device.
4. a kind of voltage controlled current source output circuit according to claim 1, which is characterized in that first isolating device and
Second isolating device is all made of Magnetic isolation chip.
5. a kind of voltage controlled current source output circuit according to claim 1, which is characterized in that the D/A device passes through certainly
The data line and clock line and control system digital circuit of band communicate to connect.
6. a kind of voltage controlled current source output circuit according to claim 1, which is characterized in that the A/D device passes through certainly
The data line and clock line and control system digital circuit of band communicate to connect.
7. a kind of voltage controlled current source output circuit according to claim 1, which is characterized in that the D/A device and A/D device
Part uses different device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822140565.6U CN209460666U (en) | 2018-12-19 | 2018-12-19 | Voltage controlled current source output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822140565.6U CN209460666U (en) | 2018-12-19 | 2018-12-19 | Voltage controlled current source output circuit |
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| Publication Number | Publication Date |
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| CN209460666U true CN209460666U (en) | 2019-10-01 |
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ID=68041307
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822140565.6U Active CN209460666U (en) | 2018-12-19 | 2018-12-19 | Voltage controlled current source output circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109634340A (en) * | 2018-12-19 | 2019-04-16 | 卡斯柯信号有限公司 | A kind of voltage controlled current source output circuit |
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2018
- 2018-12-19 CN CN201822140565.6U patent/CN209460666U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109634340A (en) * | 2018-12-19 | 2019-04-16 | 卡斯柯信号有限公司 | A kind of voltage controlled current source output circuit |
| CN109634340B (en) * | 2018-12-19 | 2023-10-13 | 卡斯柯信号有限公司 | Voltage-controlled constant-current source output circuit |
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