CN109839534A - A kind of power current isolation Acquisition Circuit - Google Patents
A kind of power current isolation Acquisition Circuit Download PDFInfo
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- CN109839534A CN109839534A CN201711211886.4A CN201711211886A CN109839534A CN 109839534 A CN109839534 A CN 109839534A CN 201711211886 A CN201711211886 A CN 201711211886A CN 109839534 A CN109839534 A CN 109839534A
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- unit
- isolated
- power supply
- power
- sampling resistor
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Abstract
The invention belongs to airborne analog acquisition technical field more particularly to a kind of Acquisition Circuit is isolated based on the power current powered floatingly.The circuit includes isolated power supply unit, sampling resistor, signal conditioning unit, A/D converting unit and isolation optocoupler unit, sampling resistor is serially connected on power circuit, the voltage at sampling resistor both ends is sent to A/D converting unit after signal conditioning unit improves, and the transformation result of A/D converting unit is transmitted to Electromechanical Management computer through isolation optocoupler unit；Isolation optocoupler unit one end is powered by isolated power supply unit, and the other end is powered by digital power；A/D converting unit and signal conditioning unit pass through isolated power supply unit and power；The anode of isolated power supply unit is connected with the current input terminal of sampling resistor.A kind of power current isolation Acquisition Circuit is provided, realizes the high-precision isolation acquisition of power current.
Description
Technical field
The invention belongs to airborne analog acquisition technical field more particularly to it is a kind of based on the power current powered floatingly every
From Acquisition Circuit.
Background technique
It include the demand that need to largely detect interface power electric current in aircraft utilities system, traditional way is generally in interface function
Rate electric current concatenates sampling resistor before importing ground wire, resolves interface power electric current by acquisition resistive voltage, when each interface is different
When within Shi Yi equipment, individual power current loop line need to be set, cause its cable designs heavy, simultaneously because ground level
Interfere with each other and couple, cause analog acquisition precision reduce and signal processing complexity increase；It is existing another
Way be power current flow into interface before concatenate sampling resistor, after being converted by isolation amplifier, by analog quantity voltage send to
A/D conversion module, but isolation amplifier can make A/D conversion module lose 2~3 acquisition precisions, reduce the essence of power current acquisition
Degree.
Summary of the invention
Present invention solves the technical problem that: a kind of power current isolation Acquisition Circuit is provided, realizes the high-precision of power current
Degree isolation acquisition.
Technical solution of the present invention: a kind of power current isolation Acquisition Circuit, it is characterized in that: the circuit includes isolation electricity
Source unit, sampling resistor, signal conditioning unit, A/D converting unit and isolation optocoupler unit, sampling resistor are serially connected in power circuit
On, the voltage at sampling resistor both ends is sent to A/D converting unit, the conversion of A/D converting unit after signal conditioning unit improves
As a result Electromechanical Management computer is transmitted to through isolation optocoupler unit；
Isolation optocoupler unit one end is powered by isolated power supply unit, and the other end is powered by digital power；
A/D converting unit and signal conditioning unit pass through isolated power supply unit and power；
The anode of isolated power supply unit is connected with the current input terminal of sampling resistor.
Preferably, the isolated power supply unit uses isolated power supply module or discrete device isolation method, realizes isolation electricity
Source transformation.
Preferably, the sampling resistor resistance value choose should ensure that pressure drop that power current is generated in sampling resistor no more than every
From power supply unit output voltage, to reduce signal conditioning unit design complexities.
Preferably, the A/D converting unit output interface is SPI interface.
Beneficial effects of the present invention: signal conditioning unit, A/D converting unit and signal isolation cell operation power supply are using floating
Ground power supply mode is eliminated the setting of cable loop line, has evaded and having been lost using A/D conversion accuracy caused by isolation amplifier, realized
The isolation of analog quantity system and digital information processing system eliminates the coupled interference between power circuit and digital circuit, increases
The anti-interference intensity for having added system improves power current acquisition precision.
Detailed description of the invention
Fig. 1 is the principle of the present invention schematic diagram.
Fig. 2 show a kind of 28V bus current acquisition schematic diagram
Specific embodiment
The present invention will be further described with specific embodiment with reference to the accompanying drawing.
Fig. 1 is a kind of power current isolation Acquisition Circuit functional block diagram.Shown in referring to Fig.1, circuit includes isolated power supply list
Member, sampling resistor, signal conditioning unit, A/D converting unit and isolation optocoupler unit, sampling resistor are serially connected on power circuit,
The voltage at sampling resistor both ends is sent to A/D converting unit, the transformation result of A/D converting unit after signal conditioning unit improves
It is transmitted to Electromechanical Management computer through isolation optocoupler unit, to complete the resolving of power current value.
Fig. 2 show a kind of 28V bus current acquisition schematic diagram, and 5V digital power is through being isolated DC/DC power supply chip
3.3V power supply is generated after DCP020503P, for A/D converter and isolation optocoupler cell operation, the anode and 28V of 3.3V power supply are female
The connection of line power supply, it is 24.7V that 3.3V power supply negative terminal voltage is practical at this time.Power current is flowed through from the sampling resistor of 0.1 Ω, through RC
A/D converting unit is input to after resistor network Signal Regulation, the input voltage of A/D converting unit is Vin=3.3-i*0.1, i are
The electric current of sampling resistor is flowed through, therefore the maximum sample rate current of the circuit design is 33A, A/D converting unit is using ADI company
AD7691 chip, A/D transformation result are sent to isolation optocoupler unit by SPI interface, and isolation optocoupler converts the signal into number
Word logic is sent to Electromechanical Management computer, to complete the acquisition and resolving of power current.
Claims (4)
1. Acquisition Circuit is isolated in a kind of power current, it is characterized in that: the circuit includes isolated power supply unit, sampling resistor, letter
Number conditioning unit, A/D converting unit and isolation optocoupler unit, sampling resistor are serially connected on power circuit, sampling resistor both ends
Voltage is sent to A/D converting unit after signal conditioning unit improves, and the transformation result of A/D converting unit is through isolation optocoupler unit
It is transmitted to Electromechanical Management computer；
Isolation optocoupler unit one end is powered by isolated power supply unit, and the other end is powered by digital power；
A/D converting unit and signal conditioning unit pass through isolated power supply unit and power；
The anode of isolated power supply unit is connected with the current input terminal of sampling resistor.
2. Acquisition Circuit is isolated in a kind of power current according to claim 1, it is characterized in that: the isolated power supply unit is adopted
With isolated power supply module or discrete device isolation method.
3. Acquisition Circuit is isolated in a kind of power current according to claim 1, it is characterized in that: the sampling resistor resistance value choosing
It takes and should ensure that power current is not more than isolated power supply unit output voltage in the pressure drop that sampling resistor generates.
4. Acquisition Circuit is isolated in a kind of power current according to claim 1, it is characterized in that: the A/D converting unit is defeated
Outgoing interface is SPI interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711211886.4A CN109839534B (en) | 2017-11-27 | 2017-11-27 | Power current isolation acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711211886.4A CN109839534B (en) | 2017-11-27 | 2017-11-27 | Power current isolation acquisition circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109839534A true CN109839534A (en) | 2019-06-04 |
| CN109839534B CN109839534B (en) | 2021-08-03 |
Family
ID=66879425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711211886.4A Active CN109839534B (en) | 2017-11-27 | 2017-11-27 | Power current isolation acquisition circuit |
Country Status (1)
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| CN (1) | CN109839534B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304466A (en) * | 2020-10-20 | 2021-02-02 | 武汉智能装备工业技术研究院有限公司 | Multichannel scanning formula temperature measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304466A (en) * | 2020-10-20 | 2021-02-02 | 武汉智能装备工业技术研究院有限公司 | Multichannel scanning formula temperature measuring device |
| CN112304466B (en) * | 2020-10-20 | 2023-02-28 | 武汉微环控技术有限公司 | Multichannel scanning formula temperature measuring device |
Also Published As
| Publication number | Publication date |
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| CN109839534B (en) | 2021-08-03 |
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