CN107664712A - Current sample modulate circuit - Google Patents
Current sample modulate circuit Download PDFInfo
- Publication number
- CN107664712A CN107664712A CN201610601861.4A CN201610601861A CN107664712A CN 107664712 A CN107664712 A CN 107664712A CN 201610601861 A CN201610601861 A CN 201610601861A CN 107664712 A CN107664712 A CN 107664712A
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- Prior art keywords
- resistance
- electric capacity
- ina143
- differential amplifier
- high speed
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- 230000033228 biological regulation Effects 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000013016 damping Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 abstract description 3
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 description 6
- 230000003750 conditioning effect Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
Abstract
The present invention relates to modulus signal switch technology field, and in particular to a kind of current sample modulate circuit, including sample resistance R40 and R41, common mode rejection circuit, decoupling capacitance C106 and C107, electric capacity of voltage regulation C112, electric capacity C111 and high speed and precision differential amplifier INA143；The present invention can flexibly nurse one's health the size of current sensor output voltage, be allowed to the scope for being adapted to the electronic circuit sampling request such as AD and controller chip, avoid module damage, ensure measurement result, will not distortion；In addition, the circuit can effectively suppress moment vibration and the high frequency electric of overvoltage using resistance capaciting absorpting circuit, the waveform of overvoltage is set to slow down, steepness and amplitude reduce, and along with the damping action of resistance, the higher-order of oscillation is decayed rapidly；The circuit selects high speed and precision differential amplifier INA143, and sampled signal is accurately amplified, and exports stabilization, disturbs small sample rate current, and speed is fast, real-time.
Description
Technical field
The present invention relates to modulus signal switch technology field, and in particular to a kind of current sample modulate circuit.
Background technology
Sampling is by the time is upper, all continuous analog signal in amplitude, in the presence of sampling pulse, is converted on the time
Still continuous discrete analog signal on discrete (having fixed intervals on the time) but amplitude.At present, digital sampling techniques are used and are somebody's turn to do
Principle, analog signal continuous in time is transformed to data signal using A/D, then by the modulation extraction time of controller
Discrete data signal.
In Control System of Microcomputer, AD Acquisition Circuit module is often used, for converting analog signals into microprocessor
The data signal that device can identify.But AD Acquisition Circuit module has certain limitation requirement to incoming level, it is impossible to too high
Can not be too low.If incoming level is too high, it is possible to module damage can be made or make measurement result inaccurate, if incoming level is too low,
It is possible to cause result distortion because AD inelastic regions in itself are in.
The content of the invention
In order to solve the above-mentioned technical problem the deficiency in, it is an object of the invention to：A kind of current sample conditioning electricity is provided
Road, the size of current sensor output voltage can be flexibly nursed one's health, effectively suppress moment vibration and the high-frequency electrical of switching overvoltage
Stream.
The present invention is that technical scheme is used by solving its technical problem：
The current sample modulate circuit, including sample resistance R40 and R41, common mode rejection circuit, decoupling capacitance C106 and
C107, electric capacity of voltage regulation C112, electric capacity C111 and high speed and precision differential amplifier INA143, the sample resistance R40 both ends point
Not Lian Jie current sensor voltage output end Ua+ and Ua-, high speed and precision differential amplifier INA143 input and electric capacity
C111 is connected, high speed and precision differential amplifier INA143 OUTPUT pins external sampling electricity after being connected with SENSE pins
R41 is hindered, the sample resistance R41 other end is connected to voltage output end Ua, high speed and precision differential amplifier INA143 REF pins
Reference voltage Vref is connect, electric capacity of voltage regulation C112 is attempted by between voltage output end Ua and reference voltage Vref, and high speed and precision is differential
Amplifier INA143 power positive end V+ connection external dc powers, power supply negative terminal V- ground connection.
Further preferably, common mode rejection circuit includes resistance R39 and R45, electric capacity C109 and C113, resistance R39 and electric capacity
After C109 the first resistance capaciting absorpting circuits in series, a termination Ua+, other end ground connection, resistance R45 and electric capacity C113 are in series
After second resistance capaciting absorpting circuit, a termination Ua-, other end ground connection.
Further preferably, it is in parallel between high speed and precision differential amplifier INA143 power positive end V+ and power supply negative terminal V- to move back
Coupling electric capacity C106 and C107.
Compared with prior art, the invention has the advantages that：
The present invention can flexibly nurse one's health the size of current sensor output voltage, be allowed to be adapted to the electricity such as AD and controller chip
The scope of sub-circuit sampling request, module damage is avoided, ensure measurement result, will not distortion；In addition, the circuit is inhaled using capacitance-resistance
Moment vibration and the high frequency electric of overvoltage can effectively be suppressed by receiving circuit, the waveform of overvoltage is slowed down, steepness and amplitude
Reduce, along with the damping action of resistance, the higher-order of oscillation is decayed rapidly；The circuit selects high speed and precision differential amplifier
INA143, sampled signal is accurately amplified, and export stabilization, disturb small sample rate current, speed is fast, real-time.
Brief description of the drawings
Fig. 1 electrical block diagrams of the present invention.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Embodiment 1
As shown in figure 1, current sample modulate circuit of the present invention, including sample resistance R40 and R41, common mode inhibition electricity
Road, decoupling capacitance C106 and C107, electric capacity of voltage regulation C112, electric capacity C111 and high speed and precision differential amplifier INA143, it is described to take
Sample resistance R40 both ends connect the voltage output end Ua+ and Ua- of current sensor, current sensor secondary side induced electricity respectively
Stream flows through sample resistance R40 and produces voltage, and sample resistance R40 plays a part of sampling and voltage amplitude limit, high speed and precision are poor
Dynamic amplifier INA143 input is connected with electric capacity C111, high speed and precision differential amplifier INA143 OUTPUT pins and
SENSE pins external sample resistance R41 after being connected, sample resistance the R41 other end are connected to voltage output end Ua, at a high speed essence
Close differential amplifier INA143 REF pins connect reference voltage Vref, and electric capacity of voltage regulation C112 is attempted by voltage output end Ua and ginseng
Between examining voltage Vref, the property that can not be mutated using electric capacity of voltage regulation C112 both end voltages, the voltage of relative smooth can be exported,
High speed and precision differential amplifier INA143 power positive end V+ connection external dc powers, power supply negative terminal V- ground connection；High speed and precision
Differential amplifier INA143 can further effective suppression common mode signal, and can accurately amplifying, and export stabilization, interference it is small
Sample rate current, speed is fast, real-time.
Wherein, common mode rejection circuit includes resistance R39 and R45, electric capacity C109 and C113, resistance R39 and electric capacity C109 strings
After connection forms the first resistance capaciting absorpting circuit, a termination Ua+, other end ground connection, resistance R45 and electric capacity C113 the second resistances in series
After holding absorbing circuit, a termination Ua-, other end ground connection；First, second resistance capaciting absorpting circuit can effectively suppress the moment of overvoltage
Vibration and high frequency electric, make the waveform of overvoltage slow down, and steepness and amplitude reduce, and along with the damping action of resistance, make high frequency
The rapid decay of vibration.
Decoupling capacitance C106 in parallel between high speed and precision differential amplifier INA143 power positive end V+ and power supply negative terminal V-
And C107；Decoupling capacitance C106 and C107 can prevent unwanted oscillation caused by positive feedback path that circuit is formed by power supply,
It is exactly the influence for eliminating the fluctuation of power supply and the High-frequency Interference of input circuit to chip in brief.
The voltage signal that current sensor measurement obtains can be carried out hardware conditioning by the present invention, and the signal is transformed to
The voltage signal of measurement, surveyed electricity is scaled by DSP by the signal in level range that DSP A/D ports can identify
Flow signal.
Claims (3)
1. a kind of current sample modulate circuit, it is characterised in that including sample resistance R40 and R41, common mode rejection circuit, decoupling
Electric capacity C106 and C107, electric capacity of voltage regulation C112, electric capacity C111 and high speed and precision differential amplifier INA143, the sample resistance
R40 both ends connect the voltage output end Ua+ and Ua- of current sensor respectively, and high speed and precision differential amplifier INA143's is defeated
Enter end with electric capacity C111 to be connected, after high speed and precision differential amplifier INA143 OUTPUT pins are connected with SENSE pins
External sample resistance R41, sample resistance the R41 other end are connected to voltage output end Ua, high speed and precision differential amplifier
INA143 REF pins connect reference voltage Vref, electric capacity of voltage regulation C112 be attempted by voltage output end Ua and reference voltage Vref it
Between, high speed and precision differential amplifier INA143 power positive end V+ connection external dc powers, power supply negative terminal V- ground connection.
2. current sample modulate circuit according to claim 1, it is characterised in that common mode rejection circuit includes resistance R39
And R45, electric capacity C109 and C113, resistance R39 with after electric capacity C109 the first resistance capaciting absorpting circuits in series, a termination Ua+, separately
After one end ground connection, resistance R45 and electric capacity C113 the second resistance capaciting absorpting circuits in series, a termination Ua-, other end ground connection.
3. current sample modulate circuit according to claim 1, it is characterised in that high speed and precision differential amplifier INA143
Power positive end V+ and power supply negative terminal V- between decoupling capacitance C106 and C107 in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610601861.4A CN107664712A (en) | 2016-07-27 | 2016-07-27 | Current sample modulate circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610601861.4A CN107664712A (en) | 2016-07-27 | 2016-07-27 | Current sample modulate circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107664712A true CN107664712A (en) | 2018-02-06 |
Family
ID=61115420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610601861.4A Pending CN107664712A (en) | 2016-07-27 | 2016-07-27 | Current sample modulate circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107664712A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375689A (en) * | 2018-09-26 | 2019-02-22 | 北京精密机电控制设备研究所 | A kind of current regulating circuit |
| CN112213553A (en) * | 2020-10-29 | 2021-01-12 | 国网河北省电力有限公司 | Device for measuring current |
| CN113848365A (en) * | 2021-11-29 | 2021-12-28 | 之江实验室 | Circuit for measuring phase current of motor in high bandwidth |
-
2016
- 2016-07-27 CN CN201610601861.4A patent/CN107664712A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375689A (en) * | 2018-09-26 | 2019-02-22 | 北京精密机电控制设备研究所 | A kind of current regulating circuit |
| CN112213553A (en) * | 2020-10-29 | 2021-01-12 | 国网河北省电力有限公司 | Device for measuring current |
| CN113848365A (en) * | 2021-11-29 | 2021-12-28 | 之江实验室 | Circuit for measuring phase current of motor in high bandwidth |
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Legal Events
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180206 |