CN110412485A - A kind of output current detection circuit - Google Patents
A kind of output current detection circuit Download PDFInfo
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- CN110412485A CN110412485A CN201910853889.0A CN201910853889A CN110412485A CN 110412485 A CN110412485 A CN 110412485A CN 201910853889 A CN201910853889 A CN 201910853889A CN 110412485 A CN110412485 A CN 110412485A
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Abstract
The invention discloses a kind of output current detection circuits, are applied in power-efficient test macro, comprising: first end is connect with positive pole to be measured, the detection resistance that second end is connect with load anode；First end is connect with the non-inverting input terminal of the second end of second resistance and the first amplifier respectively, the first resistor of second end ground connection；The second resistance of the first end of first end and detection resistance connection；The connection of the second end of first end and detection resistance, the 3rd resistor that second end is connect with the first end of the inverting input terminal of the first amplifier and the 4th resistance respectively；Second end is connect with the output end of the first amplifier, and the 4th resistance of the output end as output current detection circuit；Power end is connect with the first power supply, the first amplifier of ground terminal ground connection.It using the scheme of the application, is detected with can be convenient, the interference such as temperature, environment are not easy to impact the testing result of scheme, while the scheme of the application is able to maintain higher precision.
Description
Technical field
The present invention relates to power electronics fields, more particularly to a kind of output current detection circuit.
Background technique
In electronic information class manufacturing, designs efficient power supply and be very important index, especially servicing
Device industry, the requirement to power supply are higher.In general, the mainboard or plug-in card of each block server require to survey after design is completed
Measure the efficiency of power supply.Specifically, according to formula η=Vout*Iout/ (Vin*Iin) of efficiency, and the measurement accuracy of electric current, it is special
It is not the measurement accuracy for exporting electric current, it is most important to testing result.
The detection of electric current includes that flash detection and low frontier inspection are surveyed, and flash detection refers to that check bit is seated in power supply and load
Between, the survey of low frontier inspection refers to check bit placement location between load and ground terminal, namely difference is that on positive bus-bar or exists
In negative busbar.
In traditional scheme, a kind of common scheme is using E-loading, i.e. electronic load carries out flash detection,
And output electric current is directly read by E-loading.But the precision of E-loading is not high, can only generally read decimal point
Two afterwards, it can only even read to a position, and artificially read and can also introduce error, make in the large-current electric source circuit of several hundred peaces
It is limited to obtain such scheme precision.
A kind of more commonly used scheme is to carry out low frontier inspection survey using precision resistance.It contacts one between circuit and load
The high-precision precision resistance of known resistance value, certain load can also choose electronic load, record the electricity at the precision resistance both ends
Pressure value obtains output current value further according to formula I=V/R.Since the common-mode voltage of low frontier inspection survey electric current is close to ground potential, so that
Circuit design is very simple, and related device is all convenient for choosing.But low side resistance increases undesirable volume in grounded circuit
External impedance.Also, such scheme is very high to the required precision of resistance, and precision resistance is bright by the interference of temperature, environment
It is aobvious, it is intended to carry out the verification of precision resistance when so that using every time, checking procedure is complicated for operation, and bumps to precision resistance all
It may cause resistance value change, and then very big influence generated on the testing result of output electric current.
In conclusion how more easily to be tested output electric current, and be able to maintain when testing power-efficient
Higher precision is current those skilled in the art technical problem urgently to be solved.
Summary of the invention
The object of the present invention is to provide a kind of output current detection circuits, more easily to survey to output electric current
Examination, and keep higher precision.
In order to solve the above technical problems, the invention provides the following technical scheme:
A kind of output current detection circuit is applied in power-efficient test macro, comprising:
First end is connect with positive pole to be measured, the detection resistance that second end is connect with load anode；
First end is connect with the non-inverting input terminal of the second end of second resistance and the first amplifier respectively, second end ground connection
First resistor；
The second resistance that first end is connect with the first end of the detection resistance；
First end is connect with the second end of the detection resistance, the second end inverting input terminal with first amplifier respectively
And the 4th resistance first end connection 3rd resistor；
Second end is connect with the output end of first amplifier, and described in the output end as output current detection circuit
4th resistance；
Power end is connect with the first power supply, first amplifier of ground terminal ground connection.
Preferably, the detection resistance, the first resistor, the second resistance, the 3rd resistor, the 4th electricity
Resistance and first amplifier are integrated in a piece of Demo plate.
Preferably, the resistance value of the first resistor is equal to the resistance value of the 4th resistance, the resistance value etc. of the second resistance
In the resistance value of the 3rd resistor.
Preferably, the load is electronic load.
Preferably, first amplifier is precision current detection calculations amplifier.
Preferably, further includes:
First end is connect with the output end of the second end of the 4th resistance and first amplifier respectively, second end respectively with
5th resistance of the inverting input terminal connection of the first end and the second amplifier of the 6th resistance；
Power end is connect with second source, and ground terminal and non-inverting input terminal are grounded, output end and the 6th resistance
Second end connection second amplifier；And the connecting pin of second amplifier and the 6th resistance is as the output electricity
The output end of current detection circuit；
6th resistance.
Preferably, further includes:
Control terminal is connect with the output end of first amplifier, first end respectively with the second end of the first resistor and
The second end of 4th resistance connects, the transistor of the input terminal connection of second end and current mirror circuit；
The current mirror circuit that output end is connect with the input terminal of current-to-voltage convertor part；
The current-to-voltage convertor part of the output end as the output end of the output current detection circuit.
Preferably, the transistor is the first triode；Control of the base stage of first triode as the transistor
End processed, first end of the collector of first triode as the transistor, the emitter conduct of first triode
The second end of the transistor.
Preferably, the current-to-voltage convertor part is the 7th resistance or is first voltage buffer.
In the scheme of the application, the detection of output electric current, i.e. the first of detection resistance are carried out by the way of flash detection
End is connect with positive pole to be measured, and second end is connect with load anode.Compared to the low side for using precision resistance in traditional scheme
Detection, such mode will not introduce extra impedance, be conducive to improve measuring accuracy.Also, the required precision to detection resistance
It is lower, i.e., it is lower to the influence degree of the output electric current detected when the factors such as temperature, environment generate interference to detection resistance.
The mode of flash detection needs to bear biggish common-mode voltage, in the scheme of the application, can pass through first resistor, the second electricity
The partial-pressure structure that resistance, 3rd resistor and the 4th resistance are constituted, so that being applied to the voltage symbol of two input terminals of the first amplifier
Close requirement of first amplifier to common mode input.Therefore, it is detected with can be convenient in the scheme of the application, temperature, ring
The interference such as border are not easy to impact the testing result of scheme, while the scheme of the application is able to maintain higher precision.
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, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of output current detection circuit in the present invention；
Fig. 2 is the structural schematic diagram of the output current detection circuit in another embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the output current detection circuit in another embodiment of the invention.
Specific embodiment
Core of the invention is to provide a kind of output current detection circuit, is detected with can be convenient, temperature, environment etc.
Interference is not easy to impact the testing result of scheme, while the scheme of the application is able to maintain higher precision.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is a kind of structural schematic diagram of output current detection circuit in the present invention, output electric current inspection
Slowdown monitoring circuit is applied in power-efficient test macro, comprising:
First end is connect with positive pole to be measured, the detection resistance Rs that second end is connect with load anode.
Load can be original load on PCB, be also possible to the electronic load convenient for regulation.Using electronic load
When, that is, when using E-loading, need rear end original on pcb board electrical component and circuitry cuts, to be changed to E-
Loading is as load.
Detection resistance Rs is as divider resistance, since the application is detected using flash, the first end of detection resistance Rs
It is connect with positive pole to be measured, the second end of detection resistance Rs is connect with load anode.
First end is connect with the non-inverting input terminal of the second end of second resistance R2 and the first amplifier OP1 respectively, second end
The first resistor R1 of ground connection；
The second resistance R2 that first end is connect with the first end of detection resistance Rs；
First end is connect with the second end of detection resistance Rs, second end respectively with the inverting input terminal of the first amplifier OP1 with
And the 4th resistance R4 first end connection 3rd resistor R3；
Second end is connect with the output end of the first amplifier OP1, and the 4th of the output end as output current detection circuit
Resistance R4；
Power end is connect with the first power supply VCC1, the first amplifier OP1 of ground terminal ground connection.
It will test input of the voltage at the both ends resistance Rs as the first amplifier OP1 by second resistance R2 and 3rd resistor R3
Import the first amplifier OP1.It should be noted that circuit needs are held since the application uses the scheme of high side current detection
By biggish common-mode signal, can be made up of first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4
Partial-pressure structure, so that the voltage for being applied to two input terminals of the first amplifier OP1 meets the first amplifier OP1 to the common mode electricity of input
The requirement of pressure.The resistance value of this four resistance is adjusted, so that the voltage for being applied to two input terminals of the first amplifier OP1 meets
Requirement of the first amplifier OP1 to common mode input.Certainly, the specification of the first amplifier OP1 is higher, i.e., its common mode that can be born is believed
Number voltage range is bigger, is more conducive to the implementation of scheme, certainly, cost is also higher.But it should be recognized that with integrated electricity
The continuous development of road and operational amplifier design, it is high-precision that there is the amplifier that can bear common-mode voltage range more greatly constantly to be pushed away
Out.I.e. when it is implemented, the first amplifier OP1 of the application can be precision current detection calculations amplifier, be conducive to improve inspection
Precision is surveyed, and with common-mode voltage range can be born more greatly, is also advantageous for facilitating the resistance value of each resistance to be arranged.Specifically
Model then can be set and be adjusted according to actual needs, such as be chosen for MAX471/MAX472, MAX4172/MAX4173,
INA138/INA168 etc..
The output end of the output current detection circuit in measurement point namely this kind of embodiment in Fig. 1, passes through detection
Really the voltage Vtp of the measurement point out can determine the electric current for flowing through detection resistance Rs, i.e., according to the circuit structure in Fig. 1
The output electric current of power supply to be measured is made, and then can determine the efficiency of power supply to be measured based on the output electric current detected.
Further, it is contemplated that the convenience of calculating, it will usually which the resistance value of first resistor R1 is equal to the 4th electricity
The resistance value of R4 is hindered, the resistance value of second resistance R2 is equal to the resistance value of 3rd resistor R3.At this point, Vtp=I* (Rs+R2+R3) * A, passes through
The formula can solve the I in formula, namely flow through the current value of detection resistance Rs.What A was indicated is in the embodiment of Fig. 1
The amplification factor of first amplifier OP1, depending on the resistance value setting of four resistance in Fig. 1, and when the resistance value of first resistor R1 is equal to
The resistance value of 4th resistance R4, when the resistance value of second resistance R2 is equal to the resistance value of 3rd resistor R3, A=R4/R3+1.
When carrying out the detection of output electric current by the way of the application, low side is carried out using precision resistance compared to traditional
The scheme of detection is lower to the required precision of detection resistance Rs.I.e. the factors such as temperature, environment generate interference to detection resistance Rs
When, the scheme of the application is lower to the influence degree of the output electric current detected, therefore is also advantageous for ensureing testing result
Precision.For example, exporting the resistance value R of precision resistance under electric current, such as normal condition using I=V/R calculating in traditional scheme is 1
Ω, due to temperature, environment, even move, wiring when the reasons such as collide with, cause the resistance value of the precision resistance to increase 1 Ω,
At this point, really output electric current V/2 is twice of calculated value V/1.And in the scheme of the application, still with common first resistor
The resistance value of R1 is equal to the resistance value of the 4th resistance R4, and the embodiment of resistance value of the resistance value equal to 3rd resistor R3 of second resistance R2 is
Example, and such as R2=R3=4 Ω, amplification factor A=10, then in this kind of embodiment of the application, even if due to disturbing factor,
So that the resistance value of detection resistance Rs is increased to 2 Ω from 1 original Ω, it is true to export electric current V/A* (Rs+R2+R3)=V/
10* (2+4+4)=V/100, compared to calculated value V/A* (1+4+4)=V/9A=V/90, error is only V/100-V/90.And
As can be seen that A is bigger, the resistance error for being more conducive to avoid detection resistance Rs is to the influence of testing result.
The interference such as temperature, environment are not easy to impact the testing result of scheme, can be convenient staff and utilize this
The scheme of application carries out the detection of output electric current, that is, is not necessarily in such as traditional scheme using precision resistance, every time before detection all
It needs to carry out complicated verification operation to the resistance value of precision resistance.
Further, it is contemplated that output current detection circuit may be used frequently, by output current detection circuit
When accessing in physical circuit, if there is colliding with to resistance or even the length of associated tracks all can cause one to detection accuracy
Determine the influence of degree, it is possible to will lead to the actual resistance of detection resistance Rs and for existing partially between the theoretical resistance value of calculating
Difference, and then the precision of testing result is influenced to a certain extent, therefore, in a specific embodiment, it will test resistance Rs,
First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and the first amplifier OP1 are integrated in a piece of Demo plate
In, facilitate the use of the output current detection circuit of the application.Output current detection circuit pair is used in particular for frequent
When the output electric current of each power supply to be measured is tested, such scheme further facilitates the operation of staff, improves
Detection efficiency, and be also beneficial to further to guarantee measuring accuracy.
In the scheme of the application, carry out the detection of output electric current by the way of flash detection, i.e. the of detection resistance Rs
One end is connect with positive pole to be measured, and second end is connect with load anode.Compared in traditional scheme use precision resistance it is low
Frontier inspection is surveyed, and such mode will not introduce extra impedance, is conducive to improve measuring accuracy.Also, to the precision of detection resistance Rs
It is required that it is lower, i.e., when the factors such as temperature, environment generate interference to detection resistance Rs, to the influence degree of the output electric current detected
It is lower.The mode of flash detection needs to bear biggish common-mode voltage, in the scheme of the application, can by first resistor R1,
The partial-pressure structure that second resistance R2,3rd resistor R3 and the 4th resistance R4 are constituted, so that being applied to two of the first amplifier OP1
The voltage of input terminal meets requirement of the first amplifier OP1 to common mode input.Therefore, it can be convenient ground in the scheme of the application
It is detected, the interference such as temperature, environment are also not easy to impact the testing result of scheme, while the scheme of the application can
Keep higher precision.
In a kind of specific embodiment of the invention, Fig. 2 is seen, can also include:
First end is connect with the output end of the second end of the 4th resistance R4 and the first amplifier OP1 respectively, second end difference
The 5th resistance R5 being connect with the inverting input terminal of the first end of the 6th resistance R6 and the second amplifier OP2；
Power end is connect with second source VCC2, and ground terminal and non-inverting input terminal are grounded, output end and the 6th resistance
Second amplifier OP2 of the second end connection of R6；And second amplifier OP2 and the 6th resistance R6 connecting pin as output electric current measure
The output end of circuit；
6th resistance R6.
For the scheme of the application due to being high side current detection, reduction common-mode voltage is extremely important, description such as above,
The application passes through the partial-pressure structure that first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 are constituted, so that applying
The voltage for adding to two input terminals of the first amplifier OP1 meets requirement of the first amplifier OP1 to common mode input, still, this
The mode of sample needs to sacrifice amplification factor.
Therefore, in the embodiment of Fig. 2, then by an amplifier, that is, the second amplifier OP2 is increased, is increased by resistance
Benefit setting arm by the gain adjustment of circuit to required biggish gain, resistive gain setting arm, that is, R1/R2 described herein and
The ratio of R4/R3.To meet the requirement of common-mode voltage and gain amplifier.Especially it is into what the first amplifier OP1 was selected
This is lower, when the lower amplifier of the range for the common mode input that can be born, needs the resistance value by R1 and R4 to be configured lower, R2
It is configured higher with the resistance value of R3, so that gain at this time is lower, the second amplifier OP2 can be passed through such as the embodiment of Fig. 2
Gain is increased to required numerical value.
But it should be recognized that the precision of each resistance should be high as far as possible in the resistive gain setting arm of the two amplifiers
And it is consistent, in order to improve the precision of testing result.In addition, the volume of circuit can be larger, cost in the mode of Fig. 2
Also the specification for the amplifier that can be improved, and select is higher, and the precision of each resistance of selection is higher, and the accuracy of testing result is also got over
It is high.
In a kind of specific embodiment of the invention, Fig. 3 is seen, can also include:
Control terminal is connect with the output end of the first amplifier OP1, first end respectively with the second end of first resistor R1 and
The second end of four resistance R4 connects, the transistor of the input terminal connection of second end and current mirror circuit；
The current mirror circuit 10 that output end is connect with the input terminal of current-to-voltage convertor part；
Current-to-voltage convertor part of the output end as the output end of output current detection circuit.
Transistor can usually be chosen for lower-cost triode, certainly, in specific occasion, can also choose other classes
The amplifying device of type.In the embodiment of Fig. 3, that transistor is just chosen is the first triode Q1；The base stage of first triode Q1
As the control terminal of transistor, first end of the collector of the first triode Q1 as transistor, the emitter of the first triode
Second end of the Q2 as transistor.
In this kind of embodiment, a lesser difference can be generated when electric current flows through detection resistance Rs on detection resistance Rs
Voltage, the differential voltage can by gain resistor R2, and the current mirror circuit 10 processing after, can provide referenced to ground
Electric current is exported, to complete to deviate from the ideal level of flash.The electric current that current mirror circuit 10 exports can pass through electric current electricity
Pressure converter part is converted to voltage, specifically, current-to-voltage convertor part can be a resistance either voltage buffer, i.e.,
Current-to-voltage convertor part can be the 7th resistance or be first voltage buffer, just have chosen voltage buffer B's in Fig. 3
Embodiment.
Scheme compared to Fig. 2, the scheme small volume of Fig. 3 can also further decrease electricity when using compact package
Road size can also handle up to the common-mode voltage of 80V or more down to working under 2.8V supply voltage.
In addition, when choosing the embodiment of Fig. 2 and Fig. 3, it also can be by each device in output current detection circuit
Part carries out integration packaging, in a package by devices packages such as resistive gain setting arms, the resistance value of each resistance can be made by temperature
Etc. the interference of external environments further reduce, be conducive to improve detection accuracy.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand technical solution of the present invention and its core concept.It should be pointed out that for the common of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for technical staff, these
Improvement and modification are also fallen within the protection scope of the claims of the present invention.
Claims (9)
1. a kind of output current detection circuit, which is characterized in that be applied in power-efficient test macro, comprising:
First end is connect with positive pole to be measured, the detection resistance that second end is connect with load anode；
First end is connect with the non-inverting input terminal of the second end of second resistance and the first amplifier respectively, and the first of second end ground connection
Resistance；
The second resistance that first end is connect with the first end of the detection resistance；
First end is connect with the second end of the detection resistance, second end respectively with the inverting input terminal of first amplifier and
The 3rd resistor of the first end connection of 4th resistance；
Second end is connect with the output end of first amplifier, and the described 4th of the output end as output current detection circuit
Resistance；
Power end is connect with the first power supply, first amplifier of ground terminal ground connection.
2. output current detection circuit according to claim 1, which is characterized in that the detection resistance, first electricity
Resistance, the second resistance, the 3rd resistor, the 4th resistance and first amplifier are integrated in a piece of Demo plate
In.
3. output current detection circuit according to claim 1, which is characterized in that the resistance value of the first resistor is equal to institute
The resistance value of the 4th resistance is stated, the resistance value of the second resistance is equal to the resistance value of the 3rd resistor.
4. output current detection circuit according to claim 1, which is characterized in that the load is electronic load.
5. output current detection circuit according to claim 4, which is characterized in that first amplifier is precision current inspection
Survey operational amplifier.
6. output current detection circuit according to claim 1, which is characterized in that further include:
First end is connect with the output end of the second end of the 4th resistance and first amplifier respectively, and second end is respectively with the 6th
5th resistance of the inverting input terminal of the first end of resistance and the second amplifier connection；
Power end is connect with second source, and ground terminal and non-inverting input terminal are grounded, and the of output end and the 6th resistance
Second amplifier of two ends connection；And the connecting pin of second amplifier and the 6th resistance is examined as the output electric current
The output end of slowdown monitoring circuit；
6th resistance.
7. output current detection circuit according to claim 1, which is characterized in that further include:
Control terminal is connect with the output end of first amplifier, first end respectively with the second end of the first resistor and described
The second end of 4th resistance connects, the transistor of the input terminal connection of second end and current mirror circuit；
The current mirror circuit that output end is connect with the input terminal of current-to-voltage convertor part；
The current-to-voltage convertor part of the output end as the output end of the output current detection circuit.
8. output current detection circuit according to claim 7, which is characterized in that the transistor is the first triode；
Control terminal of the base stage of first triode as the transistor, the collector of first triode is as the crystal
The first end of pipe, second end of the emitter of first triode as the transistor.
9. output current detection circuit according to claim 7, which is characterized in that the current-to-voltage convertor part is the
Seven resistance are first voltage buffer.
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| CN201910853889.0A CN110412485A (en) | 2019-09-10 | 2019-09-10 | A kind of output current detection circuit |
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| CN201910853889.0A CN110412485A (en) | 2019-09-10 | 2019-09-10 | A kind of output current detection circuit |
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| CN110412485A true CN110412485A (en) | 2019-11-05 |
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Application publication date: 20191105 |