CN105807127B - Current detection circuit and method - Google Patents
Current detection circuit and method Download PDFInfo
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- CN105807127B CN105807127B CN201610319624.9A CN201610319624A CN105807127B CN 105807127 B CN105807127 B CN 105807127B CN 201610319624 A CN201610319624 A CN 201610319624A CN 105807127 B CN105807127 B CN 105807127B
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The present invention provides a kind of current detection circuit and method, for detecting the electric current for cutting control rectifier net side, the circuit includes: rectification module, including rectifying bridge arm, the rectifying bridge arm has shunt resistance, the input of alternating voltage of the rectification module to receive net side, using by the ac voltage rectifier as DC voltage；Detection module is electrically connected with the rectification module, carries out analog-to-digital conversion to detect the voltage at the shunt resistance both ends, and to the voltage at the shunt resistance both ends, and analyze to obtain the electric current of the net side according to the analog-digital conversion result.Circuit structure of the present invention is simple, programming is simple, few and at low cost using number of devices, is suitable for large-scale business application.
Description
Technical field
The present invention relates to detection fields, more particularly to a kind of for detecting the current detecting for cutting control rectifier current on line side
Circuit and method.
Background technique
For three-phase cuts control rectifier, when normal operation, since control algolithm needs, it is desirable that real-time detection net side three
Phase current instantaneous value.As for the detection method of alternating current, at present more typically using current sensor, current transformer,
The detection of the realization net side three-phase current such as linear isolation amplifier, but existing net side three-phase current detection higher cost, no
Conducive to large-scale business application, so needing to develop, a kind of structure is simple, precision is high and low-cost net side three-phase current
The implementation of detection.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of current detection circuit and sides
Method, for solve the problems, such as net side three-phase current detection in the prior art it is at high cost, structure is complicated and precision is not ideal enough.
In order to achieve the above objects and other related objects, the present invention provides a kind of current detection circuit, cuts control for detecting
The electric current of rectifier net side, the circuit include: rectification module, including rectifying bridge arm, and the rectifying bridge arm has shunt resistance,
The input of alternating voltage of the rectification module to receive net side, using by the ac voltage rectifier as DC voltage；Detection
Module is electrically connected with the rectification module, to detect the voltage at the shunt resistance both ends, and to the shunt resistance both ends
Voltage carry out analog-to-digital conversion, and analyzed to obtain the electric current of the net side according to the analog-digital conversion result.
In an of the invention specific embodiment, the detection module include voltage detection unit, AD conversion unit and
Analytical unit；The voltage detection unit is electrically connected with the rectification module, to detect the voltage at the shunt resistance both ends,
And it exports after amplifying the voltage at the shunt resistance both ends to the AD conversion unit；The AD conversion unit pair
The voltage at the received amplified shunt resistance both ends carries out analog-to-digital conversion；Analytical unit, to according to the mould
Number transformation result, analysis obtain the electric current of the net side.
In a specific embodiment of the invention, the AD conversion unit and the analytical unit are integrated in a processing core
In piece.
In a specific embodiment of the invention, the control rectifier of cutting is that three-phase cuts control rectifier, the current detecting electricity
Road includes electrolytic capacitor EC1, the first rectifying bridge arm, the second rectifying bridge arm, third rectifying bridge arm, the first inductance L1, the second inductance
L2 and third inductance L3；The voltage detection unit has the first voltage detection being electrically connected with first rectifying bridge arm
What unit, the second voltage detection unit being electrically connected with second rectifying bridge arm and the third rectifying bridge arm were electrically connected
Tertiary voltage detection unit；It is described processing chip have be electrically connected with the first voltage detection unit first processing units,
It the second processing unit for being electrically connected with the second voltage detection unit and is electrically connected with the tertiary voltage detection unit
Third processing unit；The both ends of the electrolytic capacitor EC1 respectively with DC power supply UdcAnode and cathode electrical connection.
In a specific embodiment of the invention, first rectifying bridge arm, including inverse conductivity type switch S1, inverse conductivity type are switched
The collector of S2 and shunt resistance RS1, the inverse conductivity type switch S1 and the DC power supply UdcAnode electrical connection, it is described inverse
The emitter of conductivity type switch S1 is electrically connected with the collector of the inverse conductivity type switch S2, and the emitter of the inverse conductivity type switch S1 is also
It is electrically connected with the first end of the first inductance L1, the second end and net side phase voltage U of the first inductance L1AElectrical connection, institute
The emitter for stating inverse conductivity type switch S2 is electrically connected with the first end of the shunt resistance RS1, the second end of the shunt resistance RS1
With the DC power supply UdcCathode electrical connection.
In a specific embodiment of the invention, second rectifying bridge arm, including inverse conductivity type switch S3, inverse conductivity type are switched
The collector of S4 and shunt resistance RS2, the inverse conductivity type switch S3 and the DC power supply UdcAnode electrical connection, it is described inverse
The emitter of conductivity type switch S3 is electrically connected with the collector of the inverse conductivity type switch S4, and the emitter of the inverse conductivity type switch S3 is also
It is electrically connected with the first end of the second inductance L2, the second end and net side phase voltage U of the second inductance L2BElectrical connection, institute
The emitter for stating inverse conductivity type switch S4 is electrically connected with the first end of the shunt resistance RS2, the second end of the shunt resistance RS2
With the DC power supply UdcCathode electrical connection.
In a specific embodiment of the invention, the third rectifying bridge arm, including inverse conductivity type switch S5, inverse conductivity type are switched
The collector of S6 and shunt resistance RS3, the inverse conductivity type switch S5 and the DC power supply UdcAnode electrical connection, it is described inverse
The emitter of conductivity type switch S5 is electrically connected with the collector of the inverse conductivity type switch S6, and the emitter of the inverse conductivity type switch S5 is also
It is electrically connected with the first end of the third inductance L3, the second end and net side phase voltage U of the third inductance L3CElectrical connection, institute
The emitter for stating inverse conductivity type switch S6 is electrically connected with the first end of the shunt resistance RS3, the second end of the shunt resistance RS3
With the DC power supply UdcCathode electrical connection.
In a specific embodiment of the invention, detection voltage u is drawn in the emitter of the inverse conductivity type switch S2a1, institute
The emitter for stating inverse conductivity type switch S4 draws detection voltage ub1, detection voltage is drawn in the emitter of the inverse conductivity type switch S6
uc1；The first voltage detection unit includes transport and placing device OP1, capacitor C1, capacitor C2, resistance R1, resistance R2, resistance R3, resistance
The first end of R4 and resistance R5, the resistance R1 receive the voltage ua1Input, the second end of the resistance R1 with it is described
It the first end of resistance R2 and is electrically connected with the first end of the capacitor C1, the voltage that the second end of the resistance R2 receives 3.3V is defeated
Enter, the second end ground connection of the capacitor C1, the first end of the resistance R3 and the inverting input terminal of the transport and placing device OP1 are electrically connected
It connects, the second end ground connection of the resistance R3, the second end of the resistance R1 and the non-inverting input terminal of the transport and placing device OP1 are electrically connected
It connects, the first end of the resistance R4 is electrically connected with the first end of the resistance R3, the second end of the resistance R4 and the resistance
The first end of R5 is electrically connected, and the second end of the resistance R5 is electrically connected with the first end of the capacitor C2, and the of the capacitor C2
Two ends ground connection, in the second end extraction voltage u of the resistance R5a2, and the first processing units are inputted, at described first
Unit is managed to the voltage ua2Analog-to-digital conversion is carried out, and is analyzed to obtain net side phase current i according to analog-digital conversion resultA；Described
Two voltage detection units include transport and placing device OP2, capacitor C3, capacitor C4, resistance R6, resistance R7, resistance R8, resistance R9, Yi Ji electricity
R10 is hindered, the first end of the resistance R6 receives the voltage ub1Input, the second end of the resistance R6 and the resistance R7's
It first end and is electrically connected with the first end of the capacitor C3, the second end of the resistance R7 receives the voltage input of 3.3V, described
The second end of capacitor C3 is grounded, and the first end of the resistance R8 is electrically connected with the inverting input terminal of the transport and placing device OP2, the electricity
The second end ground connection of R8 is hindered, the second end of the resistance R6 is electrically connected with the non-inverting input terminal of the transport and placing device OP2, the resistance
The first end of R9 is electrically connected with the first end of the resistance R8, the first end of the second end of the resistance R9 and the resistance R10
Electrical connection, the second end of the resistance R10 are electrically connected with the first end of the capacitor C4, the second end ground connection of the capacitor C4,
In the second end extraction voltage u of the resistance R10b2, and described the second processing unit is inputted, for described the second processing unit pair
The voltage ub2Analog-to-digital conversion is carried out, and is analyzed to obtain net side phase current i according to analog-digital conversion resultB；The tertiary voltage inspection
Surveying unit includes transport and placing device OP3, capacitor C5, capacitor C6, resistance R16, resistance R12, resistance R13, resistance R164 and resistance
The first end of R15, the resistance R16 receive the voltage uc1Input, the second end of the resistance R16 and the resistance R12
First end and be electrically connected with the first end of the capacitor C5, the second end of the resistance R12 receives the voltage input of 3.3V, institute
The second end ground connection of capacitor C5 is stated, the first end of the resistance R13 is electrically connected with the inverting input terminal of the transport and placing device OP3, institute
The second end ground connection of resistance R13 is stated, the second end of the resistance R16 is electrically connected with the non-inverting input terminal of the transport and placing device OP3, institute
The first end for stating resistance R164 is electrically connected with the first end of the resistance R13, the second end of the resistance R164 and the resistance
The first end of R15 is electrically connected, and the second end of the resistance R15 is electrically connected with the first end of the capacitor C6, the capacitor C6's
Second end ground connection, in the second end extraction voltage u of the resistance R15c2, and the third processing unit is inputted, for described
Three processing units are to the voltage uc2Analog-to-digital conversion is carried out, and is analyzed to obtain net side phase current i according to analog-digital conversion resultC。
In order to achieve the above objects and other related objects, the present invention provides a kind of electric current detecting method, using as above any
The electric current of control rectifier net side is cut in current detection circuit described in, detection.
In a specific embodiment of the invention, the control rectifier of cutting is that three-phase cuts control rectifier.
As described above, current detection circuit and method of the invention, described for detecting the electric current for cutting control rectifier net side
Circuit includes: rectification module, including rectifying bridge arm, and the rectifying bridge arm has shunt resistance, and the rectification module is to receive
The input of the alternating voltage of net side, using by the ac voltage rectifier as DC voltage；Detection module, with the rectification module electricity
Connection carries out analog-to-digital conversion to detect the voltage at the shunt resistance both ends, and to the voltage at the shunt resistance both ends, and
It is analyzed to obtain the electric current of the net side according to the analog-digital conversion result.Circuit structure of the present invention is simple, programming is simple, makes
It is few and at low cost with number of devices, it is suitable for large-scale business application.
Detailed description of the invention
Fig. 1 is shown as the module diagram of current detection circuit of the invention in one embodiment.
Fig. 2 is shown as the composition schematic diagram of detection module in a specific embodiment of the invention.
Fig. 3 is shown as the circuit theory schematic diagram of current detection circuit of the invention in one embodiment.
Component label instructions
1 current detection circuit
11 rectification modules
12 detection modules
121 voltage detection units
1211 first voltage detection units
1212 second voltage detection units
1213 tertiary voltage detection units
122 AD conversion units
123 analytical units
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in diagram then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Referring to Fig. 1, being shown as the module diagram of current detection circuit of the invention in one embodiment.It is described
Current detection circuit 1, for detecting the electric current for cutting control rectifier net side, the circuit 1 includes:
Rectification module 11 includes rectifying bridge arm, and the rectifying bridge arm has shunt resistance, and the rectification module 11 is to connect
Receive net side alternating voltage input, using by the ac voltage rectifier as DC voltage；The rectification module is to complete AC-
DC boosting inverter and net side PFC.
Detection module 12 is electrically connected with the rectification module 11, to detect the voltage at the shunt resistance both ends, and it is right
The voltage at the shunt resistance both ends carries out analog-to-digital conversion, and is analyzed to obtain the electricity of the net side according to the analog-digital conversion result
Stream.
Further referring to Fig.2, being shown as the composition schematic diagram of detection module in a specific embodiment of the invention.The inspection
Surveying module 12 includes: voltage detection unit 121, AD conversion unit 122 and analytical unit 123.
Wherein, the voltage detection unit 121 is electrically connected with the rectification module 11, to detect the shunt resistance two
The voltage at end, and export after the voltage at the shunt resistance both ends is amplified to the AD conversion unit 122；
The AD conversion unit 122 carries out mould to the voltage at the received amplified shunt resistance both ends
Number conversion；
The analytical unit 123 to according to the AD conversion unit 122 to the voltage at the shunt resistance both ends into
Analog-digital conversion result after row analog-to-digital conversion, analysis obtain the electric current of the net side.
In a specific embodiment of the invention, the AD conversion unit and the analytical unit are integrated in a processing core
In piece, the processing chip is, for example, a DSP (Digital Signal Process, Digital Signal Processing) chip.And preferably
, the rectification module 11 is responsible for completing three-phase AC-DC transformation, can be using Direct Current Control, direct voltage control and straight
The control strategies such as power control are connect, obtain sinusoidal current waveform and unity power factor in net side.Voltage detection unit 1212 is negative
Duty detection rectified three-phase circuit, i.e., detected and filtered to the voltage of concatenated three shunt resistances of three phase rectifier bridge arm down tube
Wave obtains three road pulse current waveforms.Processing chip is responsible for three road pulse current waveforms carrying out analog-to-digital conversion, and according to upper tube
Judged with the edge (upper edge and lower edge) of down tube driving pulse, obtains the network side current waveform of positive half cycle and negative half period.And
In next switch periods, these current waveforms will be used for the generation of pwm pulse.
Further combined with circuit diagram shown in Fig. 3, it is shown as current detection circuit in a specific embodiment of the invention
Circuit theory schematic diagram.Wherein, the control rectifier of cutting is that three-phase cuts control rectifier, and the current detection circuit 1 includes electricity
Solve capacitor EC1, the first rectifying bridge arm, the second rectifying bridge arm, third rectifying bridge arm, the first inductance L1, second inductance L2, Yi Ji
Three inductance L3；The voltage detection unit 121 has the first voltage detection unit being electrically connected with first rectifying bridge arm
1211, the second voltage detection unit 1212 and the third rectifying bridge arm being electrically connected with second rectifying bridge arm are electrically connected
The tertiary voltage detection unit 1213 connect；The processing chip has at first be electrically connected with the first voltage detection unit
Reason unit, the second processing unit for being electrically connected with the second voltage detection unit and with the tertiary voltage detection unit
The third processing unit of electrical connection；The both ends of the electrolytic capacitor EC1 respectively with DC power supply UdcAnode and cathode electrical connection.
The electrolytic capacitor is for storing energy.
In a specific embodiment of the invention, first rectifying bridge arm, including inverse conductivity type switch S1, inverse conductivity type are switched
S2 and shunt resistance RS1, wherein the inverse conductivity type switch is formed by a NPN triode and a diodes in parallel, the NPN tri-
The collector of pole pipe is electrically connected with the cathode of the diode, the anode of the emitter of the NPN triode and the diode
Electrical connection.The collector of the collector of the inverse conductivity type switch, that is, inverse conductivity type switch NPN triode, the inverse conductivity type are opened
The emitter of the emitter of pass, that is, inverse conductivity type switch NPN triode.The collector of the inverse conductivity type switch S1 with it is described
DC power supply UdcAnode electrical connection, the emitter of the inverse conductivity type switch S1 and the collector of the inverse conductivity type switch S2 are electrically connected
It connects, the emitter of the inverse conductivity type switch S1 is also electrically connected with the first end of the first inductance L1, the first inductance L1's
Second end and net side phase voltage UAElectrical connection, the emitter of the inverse conductivity type switch S2 and the first end of the shunt resistance RS1
Electrical connection, the second end of the shunt resistance RS1 and the DC power supply UdcCathode electrical connection.
In a specific embodiment of the invention, second rectifying bridge arm, including inverse conductivity type switch S3, inverse conductivity type are switched
The collector of S4 and shunt resistance RS2, the inverse conductivity type switch S3 and the DC power supply UdcAnode electrical connection, it is described inverse
The emitter of conductivity type switch S3 is electrically connected with the collector of the inverse conductivity type switch S4, and the emitter of the inverse conductivity type switch S3 is also
It is electrically connected with the first end of the second inductance L2, the second end and net side phase voltage U of the second inductance L2BElectrical connection, institute
The emitter for stating inverse conductivity type switch S4 is electrically connected with the first end of the shunt resistance RS2, the second end of the shunt resistance RS2
With the DC power supply UdcCathode electrical connection.
In a specific embodiment of the invention, the third rectifying bridge arm, including inverse conductivity type switch S5, inverse conductivity type are switched
The collector of S6 and shunt resistance RS3, the inverse conductivity type switch S5 and the DC power supply UdcAnode electrical connection, it is described inverse
The emitter of conductivity type switch S5 is electrically connected with the collector of the inverse conductivity type switch S6, and the emitter of the inverse conductivity type switch S5 is also
It is electrically connected with the first end of the third inductance L3, the second end and net side phase voltage U of the third inductance L3CElectrical connection, institute
The emitter for stating inverse conductivity type switch S6 is electrically connected with the first end of the shunt resistance RS3, the second end of the shunt resistance RS3
With the DC power supply UdcCathode electrical connection.
And in the present embodiment, the upper tube of first rectifying bridge arm is inverse conductivity type switch S1, and down tube is inverse conductivity type switch S2,
The upper tube of second rectifying bridge arm be inverse conductivity type switch S3, down tube be inverse conductivity type switch S4, the third rectifying bridge arm it is upper
Pipe is inverse conductivity type switch S5, and down tube is inverse conductivity type switch S6.
In a specific embodiment of the invention, detection voltage u is drawn in the emitter of the inverse conductivity type switch S2a1, institute
The emitter for stating inverse conductivity type switch S4 draws detection voltage ub1, detection voltage is drawn in the emitter of the inverse conductivity type switch S6
uc1；The first voltage detection unit 1211 include transport and placing device OP1, capacitor C1, capacitor C2, resistance R1, resistance R2, resistance R3,
The first end of resistance R4 and resistance R5, the resistance R1 receive the voltage ua1Input, the second end of the resistance R1 with
It the first end of the resistance R2 and is electrically connected with the first end of the capacitor C1, the second end of the resistance R2 receives the electricity of 3.3V
Pressure input, the second end ground connection of the capacitor C1, the inverting input terminal electricity of the first end of the resistance R3 and the transport and placing device OP1
Connection, the second end ground connection of the resistance R3, the second end of the resistance R1 and the non-inverting input terminal of the transport and placing device OP1 are electrically connected
It connects, the first end of the resistance R4 is electrically connected with the first end of the resistance R3, the second end of the resistance R4 and the resistance
The first end of R5 is electrically connected, and the second end of the resistance R5 is electrically connected with the first end of the capacitor C2, and the of the capacitor C2
Two ends ground connection, in the second end extraction voltage u of the resistance R5a2, and the first processing units are inputted, at described first
Unit is managed to the voltage ua2Analog-to-digital conversion is carried out, and is analyzed to obtain net side phase current i according to analog-digital conversion resultA；Preferably,
The resistance R1, resistance R2, resistance R3 and resistance R4 are feedback resistance, and the resistance value of the resistance R1 is 5.1 kilo-ohms, described
The resistance value of resistance R2 is 5.1 kilo-ohms, and the resistance value of resistance R3 is 6.8 kilo-ohms, and the resistance value of the resistance R4 is 6.8 kilo-ohms, the electricity
Resistance R5 is filter resistance, and resistance value is 1.0 kilo-ohms.
The second voltage detection unit 1212 includes transport and placing device OP2, capacitor C3, capacitor C4, resistance R6, resistance R7, electricity
The first end for hindering R8, resistance R9 and resistance R10, the resistance R6 receives the voltage ub1Input, the of the resistance R6
Two ends are electrically connected with the first end of the resistance R7 and with the first end of the capacitor C3, and the second end of the resistance R7 receives
The voltage input of 3.3V, the second end ground connection of the capacitor C3, the reverse phase of the first end of the resistance R8 and the transport and placing device OP2
Input terminal electrical connection, the second end ground connection of the resistance R8, the second end of the resistance R6 are same mutually defeated with the transport and placing device OP2's
Enter end electrical connection, the first end of the resistance R9 is electrically connected with the first end of the resistance R8, the second end of the resistance R9 and
The first end of the resistance R10 is electrically connected, and the second end of the resistance R10 is electrically connected with the first end of the capacitor C4, described
The second end of capacitor C4 is grounded, in the second end extraction voltage u of the resistance R10b2, and described the second processing unit is inputted, with
For described the second processing unit to the voltage ub2Analog-to-digital conversion is carried out, and is analyzed to obtain net side mutually electricity according to analog-digital conversion result
Flow iB；Preferably, the resistance R6, resistance R7, resistance R8 and resistance R9 are feedback resistance, and the resistance value of the resistance R6 is
5.1 kilo-ohms, the resistance value of the resistance R7 is 5.1 kilo-ohms, and the resistance value of resistance R8 is 6.8 kilo-ohms, and the resistance value of the resistance R9 is 6.8
Kilo-ohm, the resistance R10 is filter resistance, and resistance value is 1.0 kilo-ohms.
The tertiary voltage detection unit 1213 include transport and placing device OP3, capacitor C5, capacitor C6, resistance R16, resistance R12,
The first end of resistance R13, resistance R164 and resistance R15, the resistance R16 receive the voltage uc1Input, the resistance
The second end of R16 is electrically connected with the first end of the resistance R12 and with the first end of the capacitor C5, and the of the resistance R12
Two ends receive the voltage input of 3.3V, the second end ground connection of the capacitor C5, the first end of the resistance R13 and the transport and placing device
The inverting input terminal of OP3 is electrically connected, the second end ground connection of the resistance R13, the second end of the resistance R16 and the transport and placing device
The non-inverting input terminal of OP3 is electrically connected, and the first end of the resistance R164 is electrically connected with the first end of the resistance R13, the electricity
The second end of resistance R164 is electrically connected with the first end of the resistance R15, and the of the second end of the resistance R15 and the capacitor C6
One end electrical connection, the second end ground connection of the capacitor C6, in the second end extraction voltage u of the resistance R15c2, and described in input
Third processing unit, so that the third processing unit is to the voltage uc2Analog-to-digital conversion is carried out, and according to analog-digital conversion result
Analysis obtains net side phase current iC.Preferably, the resistance R11, resistance R12, resistance R13 and resistance R14 are feedback electricity
Resistance, the resistance value of the resistance R11 are 5.1 kilo-ohms, and the resistance value of the resistance R12 is 5.1 kilo-ohms, and the resistance value of resistance R13 is 6.8 thousand
Europe, the resistance value of the resistance R14 are 6.8 kilo-ohms, and the resistance R15 is filter resistance, and resistance value is 1.0 kilo-ohms.
In this present embodiment, the processing chip is after receiving voltage by analog-to-digital conversion pin, to the voltage into
Row analog-to-digital conversion and the process of analysis are (being illustrated by taking the course of work of first processing units as an example):
Processing chip includes a series of program structure of time sequencings and event triggering, and the first processing units are receiving
The voltage u exported to the first voltage detection unit 1211a2Afterwards, start to carry out the movement of corresponding analog-to-digital conversion and processing.
The first processing units are successively called and are executed PWM and module and upper tube pulse generation module occurs, and judge and
It waits under upper tube pulse along module.If upper tube pulse lower edge does not occur, continue to wait.One goes out when upper tube pulse lower edge
It is existing, start analog-to-digital conversion program immediately, to input voltage ua2It is detected, obtains input voltage ua2Digital quantity.It calls immediately
Judge the sentence that detected value is zero.If detected value is zero, it can be concluded that current on line side i.e. input current is in positive half cycle.If
Detected value is negative, and can be concluded that current on line side i.e. input current is in negative half period.After being generated in view of upper tube lower edge, immediately enter dead
Area's time judges that whether edge occurs in down tube pulse, if there is not edge in down tube pulse, waits for.Once there is down tube
Edge in pulse is carried out and opens delay, and down tube current rise time is waited to terminate.Once opening delay terminates, on lower tube current
Rising the time terminates, and starts and execute analog-to-digital conversion, to input voltage ua2It is detected, obtains input voltage ua2Digital quantity.With
It calls and judges the sentence whether detected value is positive.If detected value is positive, it can be concluded that current on line side i.e. input current is in
Positive half cycle.If detected value is negative, it can be concluded that current on line side i.e. input current is in negative half period.So far a switch week is completed
It is interim to current on line side iAMeasurement.Similarly, it can measure to obtain corresponding current on line side iBAnd iC.Measurement obtains three-phase net side electricity
Flow iA、iBAnd iCAfterwards, in next switch periods, so that it may generate PWM according to these information and module occurs.
In another specific embodiment, a kind of electric current detecting method is proposed, using current detection circuit as described above
The electric current of control rectifier net side is cut in detection.Preferably, the control rectifier of cutting is that three-phase cuts control rectifier.
In conclusion current detection circuit and method of the invention, described for detecting the electric current for cutting control rectifier net side
Circuit includes: rectification module, including rectifying bridge arm, and the rectifying bridge arm has shunt resistance, and the rectification module is to receive
The input of the alternating voltage of net side, using by the ac voltage rectifier as DC voltage；Detection module, with the rectification module electricity
Connection carries out analog-to-digital conversion to detect the voltage at the shunt resistance both ends, and to the voltage at the shunt resistance both ends, and
It is analyzed to obtain the electric current of the net side according to the analog-digital conversion result.Circuit structure of the present invention is simple, programming is simple, makes
It is few and at low cost with number of devices, it is suitable for large-scale business application.So the present invention effectively overcomes in the prior art
Various shortcoming and have high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (8)
1. a kind of current detection circuit, which is characterized in that for detecting the electric current for cutting control rectifier net side, the circuit includes:
Rectification module, including rectifying bridge arm, the rectifying bridge arm have shunt resistance, and the rectification module is to receive net side
The input of alternating voltage, using by the ac voltage rectifier as DC voltage；
Detection module is electrically connected with the rectification module, to detect the voltage at the shunt resistance both ends, and to the shunting
The voltage at resistance both ends carries out analog-to-digital conversion, and is analyzed to obtain the electric current of the net side according to the analog-digital conversion result；
The detection module includes voltage detection unit, AD conversion unit and analytical unit；
The voltage detection unit is electrically connected with the rectification module, to detect the voltage at the shunt resistance both ends, and will
The voltage at the shunt resistance both ends exports after amplifying to the AD conversion unit；
The AD conversion unit carries out analog-to-digital conversion to the voltage at the received amplified shunt resistance both ends；
The analog-digital conversion result is upper edge and the lower edge of upper tube driving pulse and down tube driving pulse；
Analytical unit, to according to the analog-digital conversion result, analysis obtains the electric current of the net side；
The AD conversion unit and the analytical unit are integrated in a processing chip；
The processing chip is judged according to the upper edge and lower edge of upper tube driving pulse and down tube driving pulse, obtains positive half cycle
With the network side current waveform of negative half period；Wherein, it if the lower edge of upper tube driving pulse does not occur, continues waiting for；If upper tube drives
The lower edge of pulse occurs, and starts analog-to-digital conversion immediately, detects to input voltage, obtains the digital quantity of input voltage；It calls
Judge the sentence that detected value is zero, if detected value is zero, concludes that current on line side is in positive half cycle；If detected value is negative, break
Current on line side is determined in negative half period；If there is the upper edge of down tube driving pulse, delay is opened in execution, waits down tube current rise time
Terminate；To the end of opening delay, down tube current rise time terminates, and starts and executes analog-to-digital conversion, examine to input voltage
It surveys, obtains the digital quantity of input voltage；Calling judges the sentence whether detected value is positive；If detected value is positive, net side is concluded
Electric current is in positive half cycle；If detected value is negative, conclude that current on line side is in negative half period.
2. current detection circuit according to claim 1, it is characterised in that: the control rectifier of cutting is that three-phase cuts control rectification
Device, the current detection circuit include electrolytic capacitor EC1, the first rectifying bridge arm, the second rectifying bridge arm, third rectifying bridge arm,
One inductance L1, the second inductance L2 and third inductance L3；The voltage detection unit has to be electrically connected with first rectifying bridge arm
The first voltage detection unit connect, the second voltage detection unit and the third that are electrically connected with second rectifying bridge arm
The tertiary voltage detection unit of rectifying bridge arm electrical connection；The processing chip has to be electrically connected with the first voltage detection unit
First processing units, the second processing unit for being electrically connected with the second voltage detection unit and with the tertiary voltage
The third processing unit of detection unit electrical connection；The both ends of the electrolytic capacitor EC1 respectively with DC power supply UdcAnode and it is negative
Pole electrical connection.
3. current detection circuit according to claim 2, it is characterised in that: first rectifying bridge arm, including inverse conductivity type
The collector and the DC power supply U of switch S1, inverse conductivity type switch S2 and shunt resistance RS1, the inverse conductivity type switch S1dc's
Anode electrical connection, the emitter of the inverse conductivity type switch S1 is electrically connected with the collector of the inverse conductivity type switch S2, described against leading
The emitter of type switch S1 is also electrically connected with the first end of the first inductance L1, the second end and net side of the first inductance L1
Phase voltage UAElectrical connection, the emitter of the inverse conductivity type switch S2 are electrically connected with the first end of the shunt resistance RS1, and described point
The second end of leakage resistance RS1 and the DC power supply UdcCathode electrical connection.
4. current detection circuit according to claim 3, it is characterised in that: second rectifying bridge arm, including inverse conductivity type
The collector and the DC power supply U of switch S3, inverse conductivity type switch S4 and shunt resistance RS2, the inverse conductivity type switch S3dc's
Anode electrical connection, the emitter of the inverse conductivity type switch S3 is electrically connected with the collector of the inverse conductivity type switch S4, described against leading
The emitter of type switch S3 is also electrically connected with the first end of the second inductance L2, the second end and net side of the second inductance L2
Phase voltage UBElectrical connection, the emitter of the inverse conductivity type switch S4 are electrically connected with the first end of the shunt resistance RS2, and described point
The second end of leakage resistance RS2 and the DC power supply UdcCathode electrical connection.
5. current detection circuit according to claim 4, it is characterised in that: the third rectifying bridge arm, including inverse conductivity type
The collector and the DC power supply U of switch S5, inverse conductivity type switch S6 and shunt resistance RS3, the inverse conductivity type switch S5dc's
Anode electrical connection, the emitter of the inverse conductivity type switch S5 is electrically connected with the collector of the inverse conductivity type switch S6, described against leading
The emitter of type switch S5 is also electrically connected with the first end of the third inductance L3, the second end and net side of the third inductance L3
Phase voltage UCElectrical connection, the emitter of the inverse conductivity type switch S6 are electrically connected with the first end of the shunt resistance RS3, and described point
The second end of leakage resistance RS3 and the DC power supply UdcCathode electrical connection.
6. current detection circuit according to claim 5, it is characterised in that: draw in the emitter of the inverse conductivity type switch S2
Voltage u is detected outa1, detection voltage u is drawn in the emitter of the inverse conductivity type switch S4b1, in the hair of the inverse conductivity type switch S6
Emitter-base bandgap grading draws detection voltage uc1；
The first voltage detection unit includes transport and placing device OP1, capacitor C1, capacitor C2, resistance R1, resistance R2, resistance R3, resistance
The first end of R4 and resistance R5, the resistance R1 receive the voltage ua1Input, the second end of the resistance R1 with it is described
It the first end of resistance R2 and is electrically connected with the first end of the capacitor C1, the voltage that the second end of the resistance R2 receives 3.3V is defeated
Enter, the second end ground connection of the capacitor C1, the first end of the resistance R3 and the inverting input terminal of the transport and placing device OP1 are electrically connected
It connects, the second end ground connection of the resistance R3, the second end of the resistance R1 and the non-inverting input terminal of the transport and placing device OP1 are electrically connected
It connects, the first end of the resistance R4 is electrically connected with the first end of the resistance R3, the second end of the resistance R4 and the resistance
The first end of R5 is electrically connected, and the second end of the resistance R5 is electrically connected with the first end of the capacitor C2, and the of the capacitor C2
Two ends ground connection, in the second end extraction voltage u of the resistance R5a2, and the first processing units are inputted, at described first
Unit is managed to the voltage ua2Analog-to-digital conversion is carried out, and is analyzed to obtain net side phase current i according to analog-digital conversion resultA；
The second voltage detection unit includes transport and placing device OP2, capacitor C3, capacitor C4, resistance R6, resistance R7, resistance R8, resistance
The first end of R9 and resistance R10, the resistance R6 receive the voltage ub1Input, the second end of the resistance R6 and institute
It states the first end of resistance R7 and is electrically connected with the first end of the capacitor C3, the second end of the resistance R7 receives the voltage of 3.3V
Input, the second end ground connection of the capacitor C3, the first end of the resistance R8 and the inverting input terminal of the transport and placing device OP2 are electrically connected
It connects, the second end ground connection of the resistance R8, the second end of the resistance R6 and the non-inverting input terminal of the transport and placing device OP2 are electrically connected
It connects, the first end of the resistance R9 is electrically connected with the first end of the resistance R8, the second end of the resistance R9 and the resistance
The first end of R10 is electrically connected, and the second end of the resistance R10 is electrically connected with the first end of the capacitor C4, the capacitor C4's
Second end ground connection, in the second end extraction voltage u of the resistance R10b2, and described the second processing unit is inputted, for described
Two processing units are to the voltage ub2Analog-to-digital conversion is carried out, and is analyzed to obtain net side phase current i according to analog-digital conversion resultB；
The tertiary voltage detection unit include transport and placing device OP3, capacitor C5, capacitor C6, resistance R16, resistance R12, resistance R13,
The first end of resistance R164 and resistance R15, the resistance R16 receive the voltage uc1Input, the of the resistance R16
Two ends are electrically connected with the first end of the resistance R12 and with the first end of the capacitor C5, and the second end of the resistance R12 receives
The voltage input of 3.3V, the second end ground connection of the capacitor C5, the first end of the resistance R13 are anti-with the transport and placing device OP3's
The electrical connection of phase input terminal, the second end ground connection of the resistance R13, the second end of the resistance R16 are same with the transport and placing device OP3's
The electrical connection of phase input terminal, the first end of the resistance R164 are electrically connected with the first end of the resistance R13, the resistance R164's
Second end is electrically connected with the first end of the resistance R15, and the second end of the resistance R15 and the first end of the capacitor C6 are electrically connected
It connects, the second end ground connection of the capacitor C6, in the second end extraction voltage u of the resistance R15c2, and input the third processing
Unit, so that the third processing unit is to the voltage uc2Analog-to-digital conversion is carried out, and analyzes to obtain according to analog-digital conversion result
Net side phase current iC。
7. a kind of electric current detecting method, it is characterised in that: application such as current detecting electricity according to any one of claims 1 to 6
The electric current of control rectifier net side is cut in road, detection.
8. electric current detecting method according to claim 7, which is characterized in that the control rectifier of cutting is that three-phase cuts control rectification
Device.
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| CN107817379B (en) * | 2016-09-13 | 2020-08-07 | 上海儒竞自动控制系统有限公司 | Boost inductor current detection system of rectifier |
| CN108288911A (en) * | 2018-04-04 | 2018-07-17 | 奥克斯空调股份有限公司 | Correcting circuit, method and the air conditioner of three-phase APFC |
| CN109507471A (en) * | 2018-12-24 | 2019-03-22 | 儒竞艾默生环境优化技术（上海）有限公司 | Detection circuit/the method in load current direction, chip, electronic equipment |
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| CN102064587A (en) * | 2011-01-18 | 2011-05-18 | 中国船舶重工集团公司第七一二研究所 | Storage battery charging and discharging device |
| CN202475293U (en) * | 2012-03-22 | 2012-10-03 | 惠州市新科华实业有限公司 | Three-phase voltage pulse width modulation rectifier |
| CN103051281A (en) * | 2013-01-30 | 2013-04-17 | 秦皇岛国能石油装备有限公司 | High-performance four-quadrant frequency converter |
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| CN104034957B (en) * | 2014-06-11 | 2018-04-17 | 台达电子企业管理（上海）有限公司 | Power conversion system and its voltage sampling apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064587A (en) * | 2011-01-18 | 2011-05-18 | 中国船舶重工集团公司第七一二研究所 | Storage battery charging and discharging device |
| CN202475293U (en) * | 2012-03-22 | 2012-10-03 | 惠州市新科华实业有限公司 | Three-phase voltage pulse width modulation rectifier |
| CN103051281A (en) * | 2013-01-30 | 2013-04-17 | 秦皇岛国能石油装备有限公司 | High-performance four-quadrant frequency converter |
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Address after: Room 1101-163, 323 Guoding Road, Yangpu District, Shanghai 200433 Patentee after: Shanghai Rujing Intelligent Control Technology Co.,Ltd. Address before: Room 1101-163, 323 Guoding Road, Yangpu District, Shanghai 200433 Patentee before: RUKING EMERSON CLIMATE TECHNOLOGIES (SHANGHAI) Co.,Ltd. |