CN205656228U - Novel current signal sampling structure - Google Patents
Novel current signal sampling structure Download PDFInfo
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- CN205656228U CN205656228U CN201620237731.2U CN201620237731U CN205656228U CN 205656228 U CN205656228 U CN 205656228U CN 201620237731 U CN201620237731 U CN 201620237731U CN 205656228 U CN205656228 U CN 205656228U
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Abstract
The utility model provides a novel current signal sampling structure, includes by the survey branch road, includes a main winding, an auxiliary winding and a series resistor, being surveyed and propping up the main winding of establishing ties on the road, auxiliary winding is parallelly connected with the main winding, and series resistor R1 and auxiliary winding establish ties. The utility model discloses a novel current signal sampling structure parts detection circuitry with the major loop, need not the device of establishing ties in the major loop. Through duplex winding in output filter inductor and the same number of turns auxiliary winding of output filter inductor main winding, direct current equivalent resistance among the ingenious utilization output filter inductor, acquisition output current's information. The last loss of detection circuitry is little, and the small lectotype of device is easy. This structure is particularly useful for plane PCB inductance.
Description
Technical field
This utility model relates to a kind of signal pickup assembly, particularly to the harvester of a kind of current signal.
Background technology
Sampling also referred to as sampling, is signal discretization in time, i.e. according to intervals △ t in simulation
Its instantaneous value is taked in the upper pointwise of signal x (t).It is multiplied with analogue signal by sampling pulse and realizes.
The selection in sampling interval and blurring: first have to determine the sampling interval to analogue signal sampling.How
△ t is rationally selected to relate to many technical factors needing and considering.It is said that in general, sample frequency is the highest, sampling
Counting the closeest, gained discrete signal more approaches original signal.But too high sample frequency is the most inadvisable,
Signal to regular length (T), collects excessive data volume (N=T/ △ t), need not to computer increase
The amount of calculation wanted and memory space；If data volume (N) limits, then the sampling time is too short, can cause one
A little data messages are rejected as an outsider.Sample frequency is too low, and sampled point is spaced too far, then discrete signal is not enough to
Reflect original signal waveform feature, it is impossible to make signal restoring, cause blurring.
Intuitively signal aliasing is that the signal that should be high frequency is mistakenly considered low frequency signal.
Having the biggest electric current to flow through sampling circuit during work, the stray inductance in circuit can produce the biggest electric current
Spike, and this kind of connection can be considered as common-mode signal these transient noise, will not form sampled current signals
In disturbing；It addition, for eliminating the high-frequency noise in sample rate current input signal, the electricity that sampling resistor collects
Pressure signal has to pass through low pass filter and enters chip.
Choosing of sampling resistor is the power bracket according to flowing through electric current, selects suitable resistance.Sampling resistor
Relatively big, thus improve the accuracy of sample circuit, but excessive resistance also brings along problem: on the one hand can
The current range gathered is the least, it is impossible to given play to the maximum fan-out capability of power device；The biggest
Resistance can make power attenuation on sampling resistor bigger, brings serious heating problem, thus affects resistance
Precision and temperature rise coefficient non-linear, even burns sampling resistor；Otherwise, sampling resistor is less, although can
To improve the ability in sampling of sample circuit, collect bigger current of electric, but too small sampling resistor
Output voltage on sampling resistor can be made to reduce, so that error deviation amount and interference noise are at signal
In amplitude, proportion is excessive, reduces sampling precision.Therefore, calculating of sampling resistor is usually with recommendation
Input voltage divided by the peak point current of the dirty sampled resistance of normal operation, be multiplied by the most again one 0.8～
The allowance coefficient of 0.9.
For improving rapidity and the susceptiveness of sample circuit, it is desirable to sampling resistor has less inductance value.Relatively
Little temperature coefficient, can avoid resistance heating to affect sampling precision: for improve sampling resistor precision and
Dispersion power attenuation reduces heating, it is contemplated that several accurate sampling resistors in parallel or series to offset resistance
The positive negative error of value improves precision.
As it is shown in figure 1, traditional switch power supply current (referring mainly to here export electric current) sampling is usually adopted
By the mode of series connection sampling resistor, by nursing one's health the information of voltage at resistance two ends, it is thus achieved that output current information.
Wherein Rsample is sampling resistor, it is assumed that its resistance is, output electric current is i, then can obtain according to Fig. 1
The relation between voltage signal and output electric current after conditioning
I=U/Rsample (1)
By formula (1) understand output electric current linear be converted into voltage signal.This voltage signal can be used to calculate
Go out to export electric current, it is also possible to be used for doing overcurrent protection and current constant control.But, sampling resistor Rsample goes here and there
It is associated in the power attenuation brought in major loop, reduces efficiency.Power consumption on sampling resistor Rsample is big, with
Output electric current increase sampling resistor type selecting can be more and more difficult, cost increase, and its also volume conference with
Increase take bigger PCB space, reduce PCB utilization rate.
Utility model content
The purpose of this utility model is to provide a kind of New type of current signal sampling structure, solve in sampling process by
In the excessive technical problem bringing added power dissipation of range or output level.
Current signal sampling structure of the present utility model, including tested branch road, including a main winding, one
An auxiliary winding and series resistor, a main winding that described tested branch road is connected, auxiliary winding with main around
Group parallel connection, series resistor R1 and auxiliary winding serial.
Described main winding and auxiliary winding coupled.
Described main winding is equal with auxiliary umber of turn.
Signal amplification unit is accessed at described series resistor two ends.
New type of current signal sampling structure of the present utility model, separates testing circuit with major loop, it is not necessary to
Tandem devices in major loop.By in output inductor and around circle identical with output inductor main winding
Number auxiliary windings, ingenious utilize direct current equivalent resistance in output inductor, it is thus achieved that the information of output electric current.
Loss on testing circuit is little, and the little type selecting of device volume is easy.This structure is particularly suited for plane PCB inductance.
Accompanying drawing explanation
Fig. 1 is the structural representation of master power switch isolation network in prior art；
Fig. 2 is the electrical block diagram of this utility model current signal sampling structure；
Fig. 3 is the schematic equivalent circuit of this utility model current signal sampling structure.
Detailed description of the invention
Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model is described in detail.
As in figure 2 it is shown, output inductor part has carried out new design.Lmain is main winding, Lsecond
For auxiliary winding, major-minor two windings couple and equal turn numbers completely, and power current is transmitted by Lmain completely,
U1 is signal amplification unit.
One main winding of series connection on tested branch road, auxiliary winding is in parallel with main winding, and series resistor R1 is with auxiliary
Help windings in series.
Main winding and auxiliary winding coupled.
Main winding is equal with auxiliary umber of turn.
Signal amplification unit U1 is accessed at series resistor R1 two ends.
As it is shown on figure 3, the L1 that equivalent circuit includes is main winding (Lmain) equivalent inductance, Req1 is main
Winding equivalent internal resistance, L2 is the equivalent inductance of auxiliary winding (Lsecond), and Req2 is auxiliary winding equivalence
Internal resistance, R1 is auxiliary winding series resistor.Its order of connection is
In actual application, Req1, Req2, R1 meet relationship below:
Req1 < < Req2+R1 and Req2 < < R1 (2)
Assuming that UL1 is voltage on L1, UReq1 is voltage on Req1, it is assumed that UL2 is voltage on L2,
UReq2 is voltage on Req2, and UR1 is resistance R1 both end voltage, as shown in Figure 3:
UL1+UReq1=UL2+UReq2+UR1 (3)
Owing to main auxiliary winding couples and equal turn numbers completely, then:
UL1=UL2 (4)
By formula (3), (4) understand
UReq1=UReq2+UR1 (5)
< < R1, again because Req2 with R1 connects, so U can be obtained to be understood Req2 by formula (2)Req2<<UR1,
So UReq2Can neglect, can obtain:
UReq1≈UR1 (6)
If the electric current (i.e. the output electric current of changer) flowing through Lmain is Io, then have
UReq1=Io*Req1 (7)
By deriving above it can be seen that UR1Signal is the most corresponding with output electric current Io.Can be to UR1
Signal is amplified the sampling waiting conditioning to realize output current signal again.
The above, only this utility model preferably detailed description of the invention, but protection model of the present utility model
Enclose and be not limited thereto, the technology model that any those familiar with the art discloses at this utility model
In enclosing, the change that can readily occur in or replacement, all should contain within protection domain of the present utility model.Cause
This, protection domain of the present utility model should be as the criterion with the protection domain of claims.
Claims (4)
1. a New type of current signal sampling structure, including tested branch road, it is characterised in that: also include one
Main winding, an auxiliary winding and a series resistor, a main winding that described tested branch road is connected, auxiliary
Help winding in parallel with main winding, series resistor R1 and auxiliary winding serial.
2. New type of current signal sampling structure as claimed in claim 1, it is characterised in that: described main winding
With auxiliary winding coupled.
3. New type of current signal sampling structure as claimed in claim 2, it is characterised in that: described main winding
Equal with auxiliary umber of turn.
4. New type of current signal sampling structure as claimed in claim 2, it is characterised in that: described concatenation electricity
Signal amplification unit is accessed at resistance two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620237731.2U CN205656228U (en) | 2016-03-25 | 2016-03-25 | Novel current signal sampling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620237731.2U CN205656228U (en) | 2016-03-25 | 2016-03-25 | Novel current signal sampling structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205656228U true CN205656228U (en) | 2016-10-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620237731.2U Active CN205656228U (en) | 2016-03-25 | 2016-03-25 | Novel current signal sampling structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN205656228U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286322A (en) * | 2018-09-21 | 2019-01-29 | 广州金升阳科技有限公司 | A kind of sampling feedback circuit and the power inverter using the circuit |
-
2016
- 2016-03-25 CN CN201620237731.2U patent/CN205656228U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286322A (en) * | 2018-09-21 | 2019-01-29 | 广州金升阳科技有限公司 | A kind of sampling feedback circuit and the power inverter using the circuit |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |