CN106556732A - Current detection circuit and electric current detecting method - Google Patents
Current detection circuit and electric current detecting method Download PDFInfo
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- CN106556732A CN106556732A CN201510646239.0A CN201510646239A CN106556732A CN 106556732 A CN106556732 A CN 106556732A CN 201510646239 A CN201510646239 A CN 201510646239A CN 106556732 A CN106556732 A CN 106556732A
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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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- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a kind of current detection circuit and electric current detecting method.Wherein, the current detection circuit includes：Signal amplification circuit, for detecting the fall voltage signal of PCB copper sheet cablings, and amplifies fall voltage signal；Digital processing circuit, for the current sampling data for flowing through PCB copper sheet cablings is calculated according to fall voltage signal.By the present invention, solve the problems, such as the mode of shunt resistance in parallel detect electric current caused by source power loss it is big, reduce source power loss.
Description
Technical field
The present invention relates to field of power supplies, in particular to a kind of current detection circuit and electric current detecting method.
Background technology
With the continuous development of the industries such as communication, broadband network, it is desirable to which electric supply system volume is less and less, and power is close
Degree more and more higher.Fig. 1 is the structural representation of the current detection circuit according to correlation technique, as shown in figure 1, in communication
On power supply, the general technology of existing detection electric current is the series shunt resistance on the current path of power supply, obtains shunt resistance
On fall voltage signal, and the fall voltage signal is sent to the ADC ends of digit chip Jing after amplifier amplifies suitable multiple
Mouthful, the output current numerical value Jing after the software algorithm in digit chip is processed.
Conventional shunt resistance has the package dimension of industrial standard and corresponding rated power, can choose different according to through-flow size
Resistance and encapsulation, by now using more 1206 encapsulation low resistance alloy Chip-Rs as a example by illustrating, it is assumed that electricity
The electric current of source power supply system is 50 amperes (A), and it is 0.001 to choose 1206 resistances for encapsulating low resistance alloy Chip-R
Ohm (Ω) (resistance is the minimum resistance value of 1206 encapsulation), the then work(of this 1206 encapsulation alloy Chip-R
Rate loss is 2.5W, far beyond its rated power 0.5W.
In order to meet the power deratng of 1206 encapsulation alloy Chip-Rs and reduce the power attenuation of whole galvanometer circuit,
The resistance of galvanometer circuit need to be reduced using the parallel connection of multiple shunt resistances.Through calculating, need at least and ter 1206
The alloy Chip-R for encapsulating 0.001 Ω resistances could meet the detection of 50A electric currents, now the power of three shunt resistances
It is lost as 0.833W.
Inventor has found that in research process, as the shunt resistance size of 1206 encapsulation is larger, multiple parallel connections will have no
Query ground takes more printed circuit board (PCB) (PCB) area, is unfavorable for that the power density of electric supply system is lifted；Together
When, shunt resistance has certain resistance, inevitable that power attenuation, is also unfavorable for the improved efficiency of power supply.
For in correlation technique, the mode of shunt resistance detects the big problem of source power loss caused by electric current in parallel,
Effective solution is proposed not yet at present.
The content of the invention
The invention provides a kind of current detection circuit and electric current detecting method, at least to solve shunt resistance in parallel
Mode detects the big problem of source power loss caused by electric current.
According to an aspect of the invention, there is provided a kind of current detection circuit, including：PCB copper sheet cablings, signal are put
Big circuit and digital processing circuit, wherein, the PCB copper sheets cabling be power source internal to one layer of power port or
, between the two ends of the PCB copper sheets cabling, there is the first impedance in the PCB copper sheets of Multi-layer Parallel；The signal amplifies electricity
Two inputs on road are connected with the two ends of the PCB copper sheets cabling respectively, for detecting the PCB copper sheets cabling
Fall voltage signal, and amplify the fall voltage signal；The digital processing circuit, is connected with the signal amplification circuit,
For the current sampling data for flowing through the PCB copper sheets cabling is calculated according to the fall voltage signal.
Alternatively, also include：Temperature sensing circuit, wherein, the temperature sensing circuit, for detecting the PCB
The temperature of copper sheet cabling.
Alternatively, the digital processing circuit also includes：Temperature coefficient computing unit, under given conditions, according to
Obtain the temperature and the temperature of the PCB copper sheets cabling that the temperature sensing circuit was detected at multiple moment
The current value of the PCB copper sheets cabling, the temperature coefficient that computational representation electric current is varied with temperature are flowed through under degree；Correction is single
Unit, for according to the temperature coefficient, correcting the current sampling data, obtaining current measurement value.
Alternatively, the signal code detection circuit includes：Operational amplifier U1, resistance-capacitance circuit, the first electric capacity
C1, first resistor R5, second resistance R6, wherein, one end of first resistor R5 and the PCB copper sheets cabling
One end connection, the other end is connected with the normal phase input end of the operational amplifier U1；The one of second resistance R6
End is connected with the other end of the PCB copper sheets cabling, and the other end is connected with the negative-phase input of the operational amplifier U1；
One end of the first electric capacity C1 is connected with the negative-phase input of the operational amplifier U1, the other end and the computing
The normal phase input end connection of amplifier U1；The negative-phase input of the operational amplifier U1 also with the resistance-capacitance circuit
One end connects, and the other end of the resistance-capacitance circuit is connected with the outfan of the operational amplifier U1；The computing is put
The outfan of big device U1 is connected with the digital processing circuit.
Alternatively, the resistance-capacitance circuit includes：3rd resistor R7 being connected in parallel and the second electric capacity C2.
Alternatively, the temperature sensing circuit includes：Temperature sensor U2, the 4th resistance R8, the 3rd electric capacity C3,
Wherein, one end of the 4th resistance R8 is connected with the outfan of the temperature sensor U2, the other end and the number
Word processing circuit connects；One end of the 3rd electric capacity C3 is connected with the outfan of the temperature sensor U2, separately
One end is grounded.
According to another aspect of the present invention, a kind of electric current detecting method is additionally provided, including：Detection PCB copper sheets are walked
The fall voltage signal of line, and amplify the fall voltage signal, wherein, the PCB copper sheets cabling is power source internal to electricity
, between the two ends of the PCB copper sheets cabling, there is the first impedance in one layer of source port or the PCB copper sheets of Multi-layer Parallel；
The current sampling data for flowing through the PCB copper sheets cabling is calculated according to the fall voltage signal.
Alternatively, before the current sampling data for flowing through the PCB copper sheets cabling is calculated according to the fall voltage signal,
Methods described also includes：Detect the temperature of the PCB copper sheets cabling.
Alternatively, the current sampling data for flowing through the PCB copper sheets cabling according to fall voltage signal calculating also includes：
Under given conditions, the PCB copper sheets cabling for being detected at multiple moment according to the acquisition temperature sensing circuit
The current value of the PCB copper sheets cabling is flowed through at the temperature and the temperature, computational representation electric current is varied with temperature
Temperature coefficient；According to the temperature coefficient, the current sampling data is corrected, current measurement value is obtained.
By the present invention, the fall voltage signal of PCB copper sheet cablings is detected using signal amplification circuit, and amplifies voltage drop
Signal；Digital processing circuit calculates the mode of the current sampling data for flowing through PCB copper sheet cablings, solution according to fall voltage signal
The mode of shunt resistance in parallel of having determined detects the big problem of source power loss caused by electric current, reduces power
Loss.
Description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, the present invention
Schematic description and description be used for explain the present invention, do not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of the current detection circuit according to correlation technique；
Fig. 2 is the flow chart of electric current detecting method according to embodiments of the present invention；
Fig. 3 is the structural representation of current detection circuit according to embodiments of the present invention；
Fig. 4 is the flow chart of electric current detecting method according to the preferred embodiment of the invention；
Fig. 5 is the alternative construction schematic diagram one of current detection circuit according to the preferred embodiment of the invention；
Fig. 6 is the alternative construction schematic diagram two of current detection circuit according to the preferred embodiment of the invention；
Fig. 7 is the alternative construction schematic diagram three of current detection circuit according to the preferred embodiment of the invention；
Fig. 8 is the alternative construction schematic diagram four of current detection circuit according to the preferred embodiment of the invention.
Specific embodiment
Below with reference to accompanying drawing and in conjunction with the embodiments describing the present invention in detail.It should be noted that in the feelings not conflicted
Under condition, the feature in embodiment and embodiment in the application can be mutually combined.
It should be noted that description and claims of this specification and the term " first " in above-mentioned accompanying drawing, " second "
Etc. being for distinguishing similar object, without for describing specific order or precedence.
A kind of electric current detecting method is provided in the present embodiment, and Fig. 2 is electric current detecting method according to embodiments of the present invention
Flow chart, as shown in Fig. 2 the flow process comprises the steps：
Step S202, detects the fall voltage signal of PCB copper sheet cablings, and amplifies fall voltage signal, wherein, PCB copper
Skin cabling is power source internal to one layer of power port or the PCB copper sheets of Multi-layer Parallel, the two ends of PCB copper sheet cablings
Between there is the first impedance；
Step S204, calculates the current sampling data for flowing through PCB copper sheet cablings according to fall voltage signal.
By above-mentioned steps, the fall voltage signal of PCB copper sheet cablings is measured, and then according to PCB copper sheet cablings
Fall voltage signal calculate and flow through the current sampling data of PCB copper sheet cablings, solve the mode of shunt resistance in parallel
The big problem of source power loss caused by detection electric current, reduces source power loss.Further, since need not be extra
Increase shunt resistance, be conducive to the lifting of power density.
Alternatively, before the current sampling data for flowing through PCB copper sheet cablings is calculated according to fall voltage signal, detect PCB
The temperature of copper sheet cabling.
Alternatively, in step S204, can under given conditions, according to acquisition temperature sensing circuit at multiple moment
The temperature of the PCB copper sheet cablings for detecting and at a temperature of flow through the current value of PCB copper sheet cablings, computational representation electric current
The temperature coefficient for varying with temperature；According to temperature coefficient, correcting current sampled value, current measurement value is obtained.
Through the above description of the embodiments, those skilled in the art is can be understood that according to above-described embodiment
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but a lot
In the case of the former be more preferably embodiment.Based on such understanding, technical scheme is substantially in other words to existing
There is the part that technology contributes embody in the form of software product, the computer software product is stored in one
In storage medium (such as ROM/RAM, magnetic disc, CD), use so that a station terminal equipment (can including some instructions
Being mobile phone, computer, server, or network equipment etc.) perform method described in each embodiment of the invention.
A kind of current detection circuit is additionally provided in the present embodiment, and the device is used to realize above-described embodiment and be preferable to carry out
Mode, had carried out repeating no more for explanation.As used below, term " module " can realize predetermined function
Software and/or hardware combination.Although the device described by following examples is preferably with software realizing, firmly
Part, or the realization of the combination of software and hardware is also may and to be contemplated.
Fig. 3 is the structural representation of current detection circuit according to embodiments of the present invention, as shown in figure 3, the current detecting
Circuit includes：PCB copper sheet cablings, signal amplification circuit and digital processing circuit, wherein, PCB copper sheets cabling is electricity
To one layer of power port or the PCB copper sheets of Multi-layer Parallel inside source, between the two ends of PCB copper sheet cablings, have
One impedance；
Two inputs of signal amplification circuit are connected with the two ends of PCB copper sheet cablings respectively, for detecting PCB copper sheets
The fall voltage signal of cabling, and amplify fall voltage signal；
Digital processing circuit, is connected with signal amplification circuit, is walked for flowing through PCB copper sheets according to fall voltage signal calculating
The current sampling data of line.
Alternatively, current detection circuit also includes：Temperature sensing circuit, wherein, temperature sensing circuit, for detecting
The temperature of PCB copper sheet cablings.
Alternatively, digital processing circuit also includes：Temperature coefficient computing unit, under given conditions, according to acquisition
Temperature sensing circuit the PCB copper sheet cablings that multiple moment detect temperature and at a temperature of flow through PCB copper sheet cablings
Current value, the temperature coefficient that computational representation electric current is varied with temperature；Correction unit, coupled to temperature coefficient computing unit,
For according to temperature coefficient, correcting current sampled value, obtaining current measurement value.
With reference to Fig. 3, alternatively, signal code detection circuit includes：Operational amplifier U1, resistance-capacitance circuit, first
Electric capacity C1, first resistor R5, second resistance R6, wherein,
One end of first resistor R5 is connected with one end of PCB copper sheet cablings, the positive of the other end and operational amplifier U1
Input connects；
One end of second resistance R6 is connected with the other end of PCB copper sheet cablings, and the other end is negative with operational amplifier U1
Phase input connects；
One end of first electric capacity C1 is connected with the negative-phase input of operational amplifier U1, the other end and operational amplifier U1
Normal phase input end connection；
The negative-phase input of operational amplifier U1 is also connected with one end of resistance-capacitance circuit, and the other end of resistance-capacitance circuit and fortune
Calculate the outfan connection of amplifier U1；
The outfan of operational amplifier U1 is connected with digital processing circuit.
Alternatively, resistance-capacitance circuit includes：3rd resistor R7 being connected in parallel and the second electric capacity C2.
Alternatively, temperature sensing circuit includes：Temperature sensor U2, the 4th resistance R8, the 3rd electric capacity C3, wherein,
One end of 4th resistance R8 is connected with the outfan of temperature sensor U2, and the other end is connected with digital processing circuit；
One end of 3rd electric capacity C3 is connected with the outfan of temperature sensor U2, other end ground connection.
Embodiments of the invention additionally provide a kind of software, and the software is used to perform in above-described embodiment and preferred implementation
The technical scheme of description.
Embodiments of the invention additionally provide a kind of storage medium.In the present embodiment, above-mentioned storage medium can be set
It is used for performing the program code of following steps for storage：
Step S202, detects the fall voltage signal of PCB copper sheet cablings, and amplifies fall voltage signal, wherein, PCB copper
Skin cabling is power source internal to one layer of power port or the PCB copper sheets of Multi-layer Parallel, the two ends of PCB copper sheet cablings
Between there is the first impedance；
Step S204, calculates the current sampling data for flowing through PCB copper sheet cablings according to fall voltage signal.
Alternatively, in the present embodiment, above-mentioned storage medium can be including but not limited to：USB flash disk, read only memory
(Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as
For RAM), portable hard drive, magnetic disc or CD etc. are various can be with the medium of store program codes.
Alternatively, the specific example in the present embodiment may be referred to showing described in above-described embodiment and optional embodiment
Example, the present embodiment will not be described here.
In order that the description of the embodiment of the present invention is clearer, it is described with reference to preferred embodiment and illustrates.
The preferred embodiment of the present invention provides the circuit that a kind of copper sheet based on digit chip detects electric current, including：
One section of PCB copper sheet cabling, one section of PCB copper sheets cabling are one or more layers parallel connection of power source internal to power port
PCB copper sheets, the electric current density of copper sheet cabling is suitably arranged according to through-flow size, the two of one section of PCB copper sheet cabling
There is impedance (Rcopper) between end, can be used to obtain the fall voltage signal that electric current flows through one section of PCB copper sheet；
Signal amplification circuit, for amplifying the fall voltage signal that one section of PCB copper sheet cablings two ends produces, output voltage drop
Amplify signal；
Temperature sensing circuit, for measuring the temperature of one section of PCB copper sheet cabling, exports copper sheet temperature signal；
Digital processing circuit, amplifies signal for receiving copper sheet temperature signal and voltage drop, and output flows through one section of PCB copper
The current values of skin.
Wherein, signal amplification circuit includes：One operational amplifier U1, a resistance-capacitance circuit, an electric capacity C1, a resistance
R5, a resistance R6.One end of resistance R5 is connected with one end of one section of PCB copper sheet cabling, the other end and operation amplifier
The normal phase input end connection of device U1；
One end of resistance R6 is connected with the other end of one section of PCB copper sheet cabling, and the other end is negative with operational amplifier U1
Phase input connects；
One end of electric capacity C1 is connected with the negative-phase input of operational amplifier U1, the other end with operational amplifier U1's
Normal phase input end connects；
The negative-phase input of operational amplifier U1 is also connected with one end of resistance-capacitance circuit, and the other end of resistance-capacitance circuit and fortune
Calculate the outfan connection of amplifier U1；
The outfan of operational amplifier U1 is connected with the ADC2 ports of digit chip U3；
Alternatively, resistance-capacitance circuit includes the resistance R7 being connected in parallel and electric capacity C2.
Wherein, temperature sensing circuit includes：One temperature sensor U2, a resistance R8, an electric capacity C3.Resistance R8's
One end is connected with the outfan of temperature sensor U2, and the other end is connected with the port of the ADC1 of digit chip U3；
One end of electric capacity C3 is connected with the outfan of temperature sensor U2, other end ground connection.
Wherein, digital processing circuit includes：One digit chip U3, has inside digit chip U3 no less than two ADC
Transducer；Digit chip U3 amplifies signal to copper sheet temperature signal and voltage drop carries out numerical operation and backoff algorithm process,
Output flows through the current values of one section of PCB copper sheet.
Larger for the size present in prior art using 1206 encapsulation shunt resistances, multiple parallel connections will certainly
Ground takes more pcb board area, meanwhile, shunt resistance has certain impedance, inevitable that power attenuation
The problems such as.The foregoing circuit provided using the preferred embodiment of the present invention, compared with prior art, by one section of PCB copper
The electric current that the detection of skin cabling passes through, without the need for the shunt resistance that this function needs is completed in prior art, both efficiently reduced
PCB accounts for plate suqare, eliminates the power attenuation on shunt resistance again, further lifts the efficiency of electric supply system, carries
High power density.
Below the embodiment of the preferred embodiment of the present invention based on foregoing circuit is described and is illustrated.
As shown in figure 3, the fall voltage signal of one section of PCB copper sheet has electric current to produce when flowing through one section of PCB copper sheet,
Signal amplification circuit is made up of operational amplifier, and temperature sensing circuit is made up of temperature sensor, digital processing circuit
It is made up of digit chip, in other words, in this example, a kind of copper sheet based on digit chip detects the implementation method bag of electric current
Include one section of PCB copper sheets, signal amplification circuit, temperature sensing circuit and digital processing circuit.The electricity of one section of PCB copper sheet
Pressure drop signal has electric current to produce when flowing through one section of PCB copper sheet, and fall voltage signal is exported Jing after operational amplifier amplification
Signal is amplified in voltage drop, and copper sheet temperature signal is exported by temperature sensor, and signal and copper sheet temperature letter are amplified in voltage drop
Number digit chip is connected to, carries out numerical operation inside digit chip and after backoff algorithm is processed, output flows through one section
The current values of PCB copper sheets.
Fig. 4 is the flow chart of electric current detecting method according to the preferred embodiment of the invention, as shown in figure 4, the method includes
Following steps：
Step 1, circuit initialization；
Step 2, obtains the temperature value and current value at multiple moment (T0, T1 etc.) under given conditions；Specified conditions are
Refer to：The load current of fixed input voltage, the output voltage of fixation and fixation.
Step 3, calculates temperature coefficient a；
Step 4, obtains the temperature value Tp of PCB copper sheet cablings；
Step 5, obtains current sampling data under the temperature value Tp of current PC B copper sheet cabling；
Step 6, using current sampling data under temperature coefficient a calibration temperature value Tp；
Step 7, calculates the actual current value after calibration, for example, temperature value Tp is multiplied with temperature coefficient a, is obtained
The corresponding current standard values of temperature value Tp, pass through arithmetic average further according to current standard value or add to current sampling data
Weight average scheduling algorithm is calibrated.
Alternatively, as shown in figure 5, in the preferred embodiments of the present invention, signal amplification circuit and temperature sensing circuit can be with
A device is set to, the fall voltage signal of one section of PCB copper sheet has electric current to produce when flowing through one section of PCB copper sheet,
The device for being integrated with signal amplification circuit and temperature sensing circuit is made up of operational amplifier and temperature sensor, at numeral
Reason circuit is made up of digit chip, and in other words, in this example, a kind of copper sheet based on digit chip detects the realization of electric current
Method includes one section of PCB copper sheet, is integrated with the device and digital processing circuit of signal amplification circuit and temperature sensing circuit.
Alternatively, as shown in fig. 6, in the preferred embodiments of the present invention, signal amplification circuit and digital processing circuit can be with
A device is set to, the fall voltage signal of one section of PCB copper sheet has electric current to produce when flowing through one section of PCB copper sheet,
Temperature sensing circuit is made up of temperature sensor, and the device for being integrated with signal amplification circuit and digital processing circuit is by transporting
Amplifier and digital chipset are calculated in other words, a kind of copper sheet based on digit chip detects the realization of electric current in this example
Method includes one section of PCB copper sheet, is integrated with the device and temperature sensing circuit of signal amplification circuit and digital processing circuit.
Alternatively, as shown in fig. 7, in the preferred embodiments of the present invention, signal amplification circuit, temperature sensing circuit sum
Word processing circuit could be arranged to a device, and the fall voltage signal of one section of PCB copper sheet is that have electric current to flow through one section of PCB
Produce during copper sheet, the device for being integrated with signal amplification circuit, temperature sensing circuit and digital processing circuit is put by computing
Big device, temperature sensor and digital chipset are in other words, in this example, a kind of copper sheet detection based on digit chip is electric
The implementation method of stream includes one section of PCB copper sheet, is integrated with signal amplification circuit, temperature sensing circuit and digital processing electricity
The device on road.
Alternatively, as shown in figure 8, in the preferred embodiments of the present invention, temperature sensing circuit and digital processing circuit can be with
A device is set to, the fall voltage signal of one section of PCB copper sheet has electric current to produce when flowing through one section of PCB copper sheet,
Signal amplification circuit is made up of operational amplifier, and the device for being integrated with temperature sensing circuit and digital processing circuit is by temperature
Degree sensor and digital chipset are in other words, in this example, a kind of copper sheet based on digit chip detects the realization of electric current
Method includes one section of PCB copper sheet, is integrated with the device and signal amplification circuit of temperature sensing circuit and digital processing circuit.
In sum, by the above embodiment of the present invention and preferred embodiment, there is provided one kind can reduce occupancy PCB
Plate suqare can reduce the implementation method of galvanometer circuit power attenuation again, overcome what traditional shunt resistance detection electric current was present
Account for the problems such as pcb board area is big, power attenuation is larger.
Obviously, those skilled in the art should be understood that each module or each step of the above-mentioned present invention can be with general
Realizing, they can concentrate on single computing device computing device, or be distributed in multiple computing devices and constituted
Network on, alternatively, they can be realized with the executable program code of computing device, it is thus possible to by they
Storage in the storage device by computing device performing, and in some cases, can be holding different from order herein
The shown or described step of row, or they are fabricated to each integrated circuit modules respectively, or will be many in them
Individual module or step are fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware
Combine with software.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the technology of this area
For personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made it is any
Modification, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of current detection circuit, it is characterised in that include：PCB copper sheet cablings, signal amplification circuit and digital processing
Circuit, wherein,
The PCB copper sheets cabling is power source internal to one layer of power port or the PCB copper sheets of Multi-layer Parallel, institute
There is the first impedance between the two ends for stating PCB copper sheet cablings；
Two inputs of the signal amplification circuit are connected with the two ends of the PCB copper sheets cabling respectively, for examining
The fall voltage signal of the PCB copper sheets cabling is surveyed, and amplifies the fall voltage signal；
The digital processing circuit, is connected with the signal amplification circuit, for being calculated according to the fall voltage signal
Flow through the current sampling data of the PCB copper sheets cabling.
2. current detection circuit according to claim 1, it is characterised in that also include：Temperature sensing circuit, wherein,
The temperature sensing circuit, for detecting the temperature of the PCB copper sheets cabling.
3. current detection circuit according to claim 2, it is characterised in that the digital processing circuit also includes：
Temperature coefficient computing unit, under given conditions, according to the acquisition temperature sensing circuit when multiple
The PCB copper sheets cabling is flowed through at the temperature and the temperature of the PCB copper sheets cabling that quarter detects
Current value, the temperature coefficient that computational representation electric current is varied with temperature；
Correction unit, for according to the temperature coefficient, correcting the current sampling data, obtaining current measurement value.
4. current detection circuit according to claim 1, it is characterised in that the signal code detects circuit bag
Include：Operational amplifier (U1), resistance-capacitance circuit, the first electric capacity (C1), first resistor (R5), second resistance (R6),
Wherein,
One end of the first resistor (R5) is connected with one end of the PCB copper sheets cabling, the other end and the fortune
Calculate the normal phase input end connection of amplifier (U1)；
One end of the second resistance (R6) is connected with the other end of the PCB copper sheets cabling, the other end with it is described
The negative-phase input connection of operational amplifier (U1)；
One end of first electric capacity (C1) is connected with the negative-phase input of the operational amplifier (U1), another
End is connected with the normal phase input end of the operational amplifier (U1)；
The negative-phase input of the operational amplifier (U1) is also connected with one end of the resistance-capacitance circuit, and the resistance
The other end of capacitive circuit is connected with the outfan of the operational amplifier (U1)；
The outfan of the operational amplifier (U1) is connected with the digital processing circuit.
5. current detection circuit according to claim 4, it is characterised in that the resistance-capacitance circuit includes：
The 3rd resistor (R7) being connected in parallel and the second electric capacity (C2).
6. current detection circuit according to claim 2, it is characterised in that the temperature sensing circuit includes：Temperature
Sensor (U2), the 4th resistance (R8), the 3rd electric capacity (C3), wherein,
One end of 4th resistance (R8) is connected with the outfan of the temperature sensor (U2), the other end
It is connected with the digital processing circuit；
One end of 3rd electric capacity (C3) is connected with the outfan of the temperature sensor (U2), the other end
Ground connection.
7. a kind of electric current detecting method, it is characterised in that include：
The fall voltage signal of detection PCB copper sheet cablings, and amplify the fall voltage signal, wherein, the PCB
Copper sheet cabling be power source internal to one layer of power port or the PCB copper sheets of Multi-layer Parallel, the PCB copper sheets are walked
There is the first impedance between the two ends of line；
The current sampling data for flowing through the PCB copper sheets cabling is calculated according to the fall voltage signal.
8. method according to claim 7, it is characterised in that described in calculating and flowing through according to the fall voltage signal
Before the current sampling data of PCB copper sheet cablings, methods described also includes：
Detect the temperature of the PCB copper sheets cabling.
9. method according to claim 8, it is characterised in that calculated according to the fall voltage signal and flow through the PCB
The current sampling data of copper sheet cabling also includes：
Under given conditions, the PCB copper sheets for being detected at multiple moment according to the acquisition temperature sensing circuit
Flow through the current value of the PCB copper sheets cabling at the temperature and the temperature of cabling, computational representation electric current with
The temperature coefficient of temperature change；
According to the temperature coefficient, the current sampling data is corrected, current measurement value is obtained.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510646239.0A CN106556732A (en) | 2015-09-30 | 2015-09-30 | Current detection circuit and electric current detecting method |
| PCT/CN2016/077745 WO2016177209A1 (en) | 2015-09-30 | 2016-03-29 | Current detecting circuit and current detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510646239.0A CN106556732A (en) | 2015-09-30 | 2015-09-30 | Current detection circuit and electric current detecting method |
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| Publication Number | Publication Date |
|---|---|
| CN106556732A true CN106556732A (en) | 2017-04-05 |
Family
ID=57217566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510646239.0A Withdrawn CN106556732A (en) | 2015-09-30 | 2015-09-30 | Current detection circuit and electric current detecting method |
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| Country | Link |
|---|---|
| CN (1) | CN106556732A (en) |
| WO (1) | WO2016177209A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677883A (en) * | 2017-10-20 | 2018-02-09 | 厦门马恒达汽车零部件有限公司 | A kind of current sensor adjustment in accuracy device and method |
| CN108535535A (en) * | 2018-04-02 | 2018-09-14 | 郑州云海信息技术有限公司 | A kind of current detection method and system for integrated chip |
| CN108918947A (en) * | 2018-06-12 | 2018-11-30 | 浙江大学 | A kind of low inductive current sensor of PCB type |
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Also Published As
| Publication number | Publication date |
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| WO2016177209A1 (en) | 2016-11-10 |
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