CN110501570B - Electric energy measuring device and current measuring mechanism thereof - Google Patents

Electric energy measuring device and current measuring mechanism thereof Download PDF

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Publication number
CN110501570B
CN110501570B CN201910874582.9A CN201910874582A CN110501570B CN 110501570 B CN110501570 B CN 110501570B CN 201910874582 A CN201910874582 A CN 201910874582A CN 110501570 B CN110501570 B CN 110501570B
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current
target
calibration
secondary side
compensation
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CN110501570A (en
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王甲
石飞
傅代军
陈立军
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Shanghai Beiling Co Ltd
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Shanghai Beiling Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/146Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/10Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/04Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current

Abstract

The invention discloses an electric energy measuring device and a current measuring mechanism thereof, wherein the current measuring mechanism comprises a magnetic core, a Hall element, an insulating layer, a control module, at least two sets of secondary compensating coils with different turn ratios and at least two secondary driving modules; the secondary driving module is used for generating a target secondary compensation current according to the Hall current output by the Hall element and inputting the target secondary compensation current to the secondary compensation coil; the control module is used for obtaining the target secondary compensation current and obtaining the target primary current according to the target secondary compensation current. The invention realizes the expansion of the current measurement range and the voltage measurement range; meanwhile, the electric energy measuring device is automatically calibrated through the reference circuit, the current output circuit and the voltage output circuit, demagnetization is automatically completed, errors in the electric energy measuring device are eliminated, and the measuring precision is improved.

Description

Electric energy measuring device and current measuring mechanism thereof
Technical Field
The invention relates to the technical field of integrated circuits, in particular to an electric energy measuring device and a current measuring mechanism thereof.
Background
At present, the direct current electric energy consumed by the device to be tested is mainly measured by the following two ways: measuring the direct current energy based on the sampling resistance and measuring the direct current energy through the closed-loop Hall.
For the measuring circuit for measuring the direct current electric energy based on the sampling resistor, although the circuit structure is simple, the measurement of the direct current electric energy is very easy to realize; however, this measurement method has the following problems in long-term measurement: because direct current is current with unchanged direction, a magnetic field always exists near a sampling resistor according to ampere rules, and in long-term operation, the sampling resistor can adsorb charged ions or attachments in surrounding air due to the existence of the magnetic field, so that the resistance value of the sampling resistor is changed, and thus, the current sampling of the sampling resistor has errors.
Although the measurement circuit for measuring direct current electric energy by closed loop hall basically solves the problem of metering misalignment caused by accuracy error drift of the sampling resistor in a direct current magnetic field for a long time, the measurement method has the following problems: 1) the measurement range is small, and the actual use requirement cannot be met; 2) after the closed-loop sensor of the Hall sensor is used for a period of time, the calibrated zero point can deviate, namely, the phenomenon of magnetization occurs, so that the problems that the metering error always exists and the measuring precision is low are caused.
Disclosure of Invention
The invention aims to overcome the defects of small measurement range, low measurement precision and the like of an electric energy measurement circuit in the prior art, and provides an electric energy measurement device and a current measurement mechanism thereof.
The invention solves the technical problems through the following technical scheme:
the invention provides a current measuring mechanism which comprises a magnetic core, a Hall element, an insulating layer, a control module, at least two sets of secondary compensation coils with different turn ratios and at least two secondary driving modules, wherein the magnetic core is arranged on the magnetic core;
an open slot is arranged on the magnetic core, and the Hall element is placed in the open slot;
each secondary side compensation coil is wound on the magnetic core, and different secondary side compensation coils are isolated through the insulating layer;
each secondary side compensation coil corresponds to one secondary side driving module;
the input end of the secondary side driving module is electrically connected with the Hall element, and the output end of the secondary side driving module is electrically connected with the input end of the secondary side compensating coil;
the secondary driving module is used for generating a target secondary compensation current according to the Hall current output by the Hall element and inputting the target secondary compensation current to the secondary compensation coil;
the target secondary side compensation current is used for keeping the Hall element in a working state of zero magnetic flux;
the first current measurement ranges corresponding to the secondary side compensation coils with different turn ratios form a target current measurement range;
the target current measurement range includes the first current measurement range;
the control module is electrically connected with the output end of each secondary side driving module;
the control module is used for obtaining the target secondary compensation current and obtaining a target primary current according to the target secondary compensation current.
Preferably, the control module is configured to control the secondary compensation coils of a set number, which are continuously in other measurement ranges, to start working when the target primary current exceeds a current measurement range corresponding to the currently-started secondary compensation coil.
Preferably, the control module comprises a digital-to-analog conversion unit and a calculation unit;
the digital-to-analog conversion unit is used for performing digital-to-analog conversion on the acquired target secondary compensation current and sending the digital-to-analog converted target secondary compensation current to the calculation unit;
and the calculating unit calculates the target primary side current according to the target secondary side compensation current after digital-to-analog conversion.
Preferably, the secondary side driving module comprises an amplifier;
the input end of the amplifier is electrically connected with the Hall element, and the output end of the amplifier is electrically connected with the input end of the secondary side compensating coil;
the amplifier is used for amplifying the Hall current output by the Hall element and sending the amplified Hall current to the secondary side compensation coil.
Preferably, the secondary side driving module further comprises a first triode, a second triode and a first resistor;
the output end of the amplifier is respectively and electrically connected with the base electrode of the first triode and the base electrode of the second triode;
the collector electrode of the first triode and the collector electrode of the second triode are both electrically connected with a power supply end;
the emitting electrode of the first triode and the emitting electrode of the second triode are electrically connected with the input end of the secondary side compensation coil;
the collector of the first triode and the collector of the second triode are used for outputting the target secondary side compensation current and inputting the target secondary side compensation current to the input end of the secondary side compensation coil;
the other end of the secondary side compensation coil is electrically connected with one end of the first resistor, and the other end of the first resistor is grounded.
The invention also provides an electric energy measuring device, which comprises the current measuring mechanism;
wherein the target primary current is a current on a first current conductor passing through the magnetic core.
Preferably, the control module is configured to calculate a performance parameter of the device under test according to the target primary current and a voltage signal of the device under test;
wherein the performance parameters include power and/or electrical energy.
Preferably, the electric energy measuring device further comprises a first reference circuit, a first enable control circuit and a current output circuit;
the first reference circuit is used for generating a calibration current value and inputting the calibration current value to a second electrifying wire;
wherein the second electrically conductive wire passes through the magnetic core;
the secondary driving module is used for outputting a first calibration secondary compensation current according to the calibration current value and inputting the first calibration secondary compensation current to the control module;
the control module is used for obtaining a first current corresponding to the second conducting wire according to the first calibration secondary side compensation current, calculating a first difference value between the first current and the calibration current value, and generating a first control instruction and sending the first control instruction to the first enabling control circuit when the first difference value is larger than or equal to a first set threshold value;
the first enabling control circuit is used for controlling the current output circuit to input set current to the input end of the secondary side compensation coil according to the first control instruction until the first difference is smaller than the first set threshold value.
Preferably, the electric energy measuring device further comprises a first communication interface circuit and a first power supply circuit;
the first communication interface circuit is electrically connected with the control module;
the first communication interface circuit is used for acquiring the performance parameters corresponding to the tested device and outputting the performance parameters to an external device;
the first power supply circuit is used for supplying power to the electric energy measuring device.
The invention also provides an electric energy measuring device, which comprises the current measuring mechanism;
the current measuring mechanism also comprises at least two primary coils with different turn ratios;
different primary side coils are isolated through the insulating layer;
the primary side coils with different turn ratios correspond to first voltage measurement ranges, and the first voltage measurement ranges form a target voltage measurement range;
the target voltage measurement range includes the first voltage measurement range;
the target primary side current is the current in the primary side coil;
the control module is used for acquiring a target voltage corresponding to the tested device according to the target primary side current.
Preferably, the control module is configured to calculate a performance parameter of the device under test according to the target voltage and the target primary current of the device under test;
wherein the performance parameters include power and/or electrical energy.
Preferably, a calibration primary coil for calibration is wound on the magnetic core;
the electric energy measuring device also comprises a second reference circuit, a second enabling control circuit and a voltage output circuit;
the second reference circuit is used for generating a calibration voltage value and inputting the calibration voltage value to the calibration primary coil;
the secondary side driving module is used for outputting a second calibration secondary side compensation current according to the calibration voltage value and inputting the second calibration secondary side compensation current to the control module;
the control module is used for acquiring a second current corresponding to the calibration primary coil according to the second calibration secondary compensation current and acquiring a first voltage value according to the second current;
the control module is further configured to calculate a second difference between the first voltage value and the calibration voltage value, and when the second difference is greater than or equal to a second set threshold, generate a second control instruction and send the second control instruction to the second enable control circuit;
the second enabling control circuit is used for controlling the voltage output circuit to input a set voltage into the primary coil according to the second control instruction until the second difference value is smaller than the second set threshold value.
Preferably, the electric energy measuring device further comprises a second communication interface circuit and a second power supply circuit;
the second communication interface circuit is electrically connected with the control module;
the second communication interface circuit is used for acquiring the performance parameters corresponding to the tested equipment and outputting the performance parameters to external equipment;
the second power supply circuit is used for supplying power to the electric energy measuring device.
The positive progress effects of the invention are as follows:
in the invention, the secondary side compensation coils with different turn ratios are isolated by the insulating layer, so that the purpose of expanding the current measurement range and the voltage measurement range is realized; meanwhile, the electric energy measuring device is automatically calibrated through the reference circuit, the current output circuit and the voltage output circuit, demagnetization is automatically completed, errors in the electric energy measuring device are eliminated, and the measuring precision is improved.
Drawings
Fig. 1 is a schematic structural view of a current measuring mechanism according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of current measurement ranges corresponding to secondary side compensation coils with different turn ratios in the prior art.
Fig. 3 is a schematic view of a current measurement range of the current measurement mechanism according to embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of a current measuring mechanism according to embodiment 2 of the present invention.
Fig. 5 is a first structural schematic diagram of a current measuring mechanism in the electric energy measuring apparatus according to embodiment 3 of the present invention.
Fig. 6 is a schematic block diagram of an electric energy measurement device according to embodiment 3 of the present invention.
Fig. 7 is a second structural schematic diagram of a current measuring mechanism in the electric energy measuring apparatus according to embodiment 3 of the present invention.
Fig. 8 is a schematic structural view of a current measuring mechanism in the electric energy measuring apparatus according to embodiment 4 of the present invention.
Fig. 9 is a block diagram of an electric energy measuring apparatus according to embodiment 4 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the current measuring mechanism of the present embodiment includes a magnetic core 1, a hall element 2, an insulating layer 3, a control module 4, at least two sets of secondary compensation coils 5 with different turn ratios, and at least two secondary driving modules 6;
an open slot is arranged on the magnetic core 1, and the Hall element 2 is placed in the open slot;
each secondary side compensation coil 5 is wound on the magnetic core 1, and different secondary side compensation coils are isolated through insulating layers;
each secondary side compensation coil corresponds to one secondary side driving module;
the input end of the secondary side driving module 6 is electrically connected with the Hall element 2, and the output end of the secondary side driving module 6 is electrically connected with the input end of the secondary side compensating coil 5;
the secondary driving module 6 is used for generating a target secondary compensation current according to the Hall current output by the Hall element 2 and inputting the target secondary compensation current to the secondary compensation coil 5;
the target secondary side compensation current is used for keeping the Hall element in a zero-magnetic-flux working state;
the first current measurement ranges corresponding to the secondary side compensation coils with different turn ratios form a target current measurement range;
the target current measurement range comprises a first current measurement range;
the control module 4 is electrically connected with the output end of each secondary side driving module 6;
the control module 4 is configured to obtain a target secondary compensation current, and obtain a target primary current according to the target secondary compensation current.
In addition, the control module 4 is configured to control the secondary compensation coils of a set number, which are continuous in other measurement ranges, to be turned on when the target primary current exceeds the current measurement range corresponding to the currently turned-on secondary compensation coil.
The following is a detailed description with reference to examples:
taking two secondary compensation coils with different turn ratios as an example, as shown in fig. 2, the current measurement ranges respectively corresponding to the secondary compensation coils with different turn ratios are shown, the horizontal axis represents the primary current, and the vertical axis represents the current in the secondary compensation coils. As can be seen, the linear accuracy range of the secondary side compensation coil 1 is between 0 and A2, and the linear accuracy range of the secondary side compensation coil 2 is between A1 and A3, wherein A1 < A2 < A3.
As shown in fig. 3, after two sets of secondary compensation coils with different turn ratios are operated, the corresponding current measurement range is 0-a3, the horizontal axis represents the primary current, and the vertical axis represents the current in the secondary compensation coil. In the actual measurement process, one set of secondary side compensation coils is started to carry out measurement, and when the measurement range exceeds A1, the other set of secondary side compensation coils is started to continue to carry out measurement, so that the current measurement in a wider range is realized.
After the second group of secondary compensation coils are started, the excitation effects generated by the two coils are not simply superposed, so that the current measuring mechanism needs to be calibrated on a standard platform body before leaving a factory to ensure that the measuring ranges of different secondary compensation coils which are sequentially started are continuous, and further a larger current measuring range is ensured.
In addition, the principle of expanding the current measurement range of the multiple sets of secondary side compensation coils with different turn ratios is similar to the process, and therefore, the details are not repeated here.
In the embodiment, the secondary side compensation coils with different turn ratios are isolated by the insulating layer, so that the purpose of expanding the current measurement range is realized, and the service performance of the conventional current measurement mechanism is improved.
Example 2
As shown in fig. 4, the current measuring mechanism of the present embodiment is a further improvement of embodiment 1, specifically:
the control module 2 comprises a digital-to-analog conversion unit 7 and a calculation unit 8;
the digital-to-analog conversion unit 7 is used for performing digital-to-analog conversion on the acquired target secondary compensation current and sending the digital-to-analog converted target secondary compensation current to the calculation unit;
and the calculating unit 8 calculates the target primary side current according to the target secondary side compensation current after the digital-to-analog conversion.
The secondary side driving module 6 includes an amplifier 9, a first transistor 10, a second transistor 11, and a first resistor R1.
The output end of the amplifier 9 is respectively and electrically connected with the base electrode of the first triode 10 and the base electrode of the second triode 11;
the collector electrode of the first triode 10 and the collector electrode of the second triode 11 are both electrically connected with a power supply end;
the emitting electrode of the first triode 10 and the emitting electrode of the second triode 11 are electrically connected with the input end of the secondary side compensation coil;
the amplifier 9 is used for amplifying the hall current output by the hall element 2 and sending the amplified hall current to the first triode and the second triode;
a collector of the first triode 10 and a collector of the second triode 11 are used for outputting a target secondary compensation current and inputting the target secondary compensation current to an input end of the secondary compensation coil;
the other end of the secondary side compensation coil is electrically connected with one end of a first resistor, and the other end of the first resistor is grounded.
In the embodiment, the secondary side compensation coils with different turn ratios are isolated by the insulating layer, so that the purpose of expanding the current measurement range is realized, and the service performance of the conventional measuring equipment is improved.
Example 3
The current measuring apparatus of the present embodiment includes the current measuring mechanism in any one of embodiments 1 or 2.
As shown in fig. 5, the target primary current in this embodiment is the current on the first current conductor L1 passing through the magnetic core.
The control module 4 is used for calculating to obtain the performance parameters of the tested equipment according to the target primary current and the voltage signal of the tested equipment;
wherein, the performance parameters include but are not limited to power, electric energy; the voltage signal of the tested device is a known quantity and is measured by other devices on the primary side.
When the current measuring apparatus performs self calibration, as shown in fig. 6, the power measuring apparatus further includes a first reference circuit 12, a first enable control circuit 13, a current output circuit 14, a first communication interface circuit 15, and a first power supply circuit 16 (the current measuring mechanism is denoted by a).
The first reference circuit 12 is used for generating a calibration current value and inputting the calibration current value to the second conductive line;
wherein a second electrically conductive wire L2 is passed through the magnetic core, as shown in fig. 7, this second electrically conductive wire L2 being dedicated to the self-calibration of the current measuring device.
The secondary driving module 6 is used for outputting a first calibration secondary compensation current according to the calibration current value and inputting the first calibration secondary compensation current to the control module 4;
the control module 4 is configured to obtain a first current corresponding to the second conduction line according to the first calibration secondary compensation current, calculate a first difference between the first current and a calibration current value, and generate a first control instruction and send the first control instruction to the first enable control circuit 13 when the first difference is greater than or equal to a first set threshold;
the first enable control circuit 13 is configured to control the current output circuit 14 to input the setting current to the input end of the secondary compensation coil according to a first control instruction until the first difference is smaller than a first setting threshold.
The first communication interface circuit 15 is electrically connected with the control module 4;
the first communication interface circuit 15 is used for acquiring the corresponding performance parameters of the tested device and outputting the performance parameters to the external device;
the first power supply circuit 16 is used to power the power measuring device.
Namely, in the long-term use process of the current measuring device, the first reference circuit is adopted to periodically output a calibration current value, such as 5-50mA (the current output range can be adjusted to other current output ranges according to actual conditions); and then the current output circuit inputs set current (forward or reverse) to the input end of the secondary compensation coil, so that a reverse or forward magnetic field with a specific size is generated in each secondary compensation coil, namely, the magnetic field generated in the secondary compensation coil counteracts the magnetizing magnetic field through dynamic calibration, thereby eliminating the system measurement error and improving the measurement precision of the current measurement device.
In the embodiment, the secondary side compensation coils with different turn ratios are isolated by the insulating layer, so that the purpose of enlarging the current measurement range is realized; meanwhile, the reference circuit and the current output circuit are used for realizing automatic calibration of the electric energy measuring device, demagnetization is automatically completed, errors in the electric energy measuring device are eliminated, and measuring accuracy is improved.
Example 4
The current measuring apparatus of the present embodiment includes the current measuring mechanism in any one of embodiments 1 or 2.
As shown in fig. 8, the current measuring mechanism further includes at least two primary coils C1 with different turns ratios;
different primary coils are isolated through an insulating layer;
the first voltage measurement ranges corresponding to the primary coils with different turn ratios form a target voltage measurement range;
the target voltage measurement range comprises a first voltage measurement range;
the target primary side current is the current in the primary side coil;
the control module 4 is used for acquiring a target voltage corresponding to the tested device according to the target primary current.
The control module 4 is used for calculating to obtain the performance parameters of the tested equipment according to the target voltage and the target primary side current of the tested equipment;
wherein the performance parameters include, but are not limited to, power, and electrical energy.
A calibration primary coil C2 for calibration is wound on the magnetic core;
when the current measuring apparatus performs self calibration, as shown in fig. 7, the power measuring apparatus further includes a second reference circuit 17, a second enable control circuit 18, a voltage output circuit 19, a second communication interface circuit 20, and a second power supply circuit 21 (the current measuring mechanism is denoted by a).
The second reference circuit 17 is configured to generate a calibration voltage value, and input the calibration voltage value to the calibration primary coil;
the secondary side driving module 6 is used for outputting a second calibration secondary side compensation current according to the calibration voltage value and inputting the second calibration secondary side compensation current to the control module;
the control module 4 is used for acquiring a second current corresponding to the calibration primary coil according to the second calibration secondary compensation current and acquiring a first voltage value according to the second current;
the control module 4 is further configured to calculate a second difference between the first voltage value and the calibration voltage value, and when the second difference is greater than or equal to a second set threshold, generate a second control instruction and send the second control instruction to the second enable control circuit;
the second enable control circuit 18 is configured to control the voltage output circuit to input the set voltage to the primary coil according to a second control instruction until the second difference is smaller than a second set threshold.
The second communication interface circuit 20 is electrically connected with the control module;
the second communication interface circuit 20 is configured to obtain a performance parameter corresponding to the device under test and output the performance parameter to the external device;
the second power supply circuit 21 is used to supply power to the power measuring device.
Namely, in the long-term use process of the current measuring device, the second reference circuit is adopted to periodically output a calibration voltage value, the calibration voltage value is compared with the second calibration secondary compensation current obtained by the control module to obtain a system measurement error, and then the set voltage (forward or reverse) is input to the input end of the secondary compensation coil through the voltage output circuit, so that the two groups of coils generate reverse or forward magnetic fields with specific sizes, namely the magnetizing magnetic field is offset by the magnetic field generated in the secondary compensation coil through dynamic calibration, the system measurement error is eliminated, and the measurement precision of the current measuring device is improved.
In the embodiment, the secondary side compensation coils with different turn ratios are isolated by the insulating layer, so that the purpose of expanding the voltage measurement range is realized; meanwhile, the electric energy measuring device is automatically calibrated through the reference circuit and the voltage output circuit, demagnetization is automatically completed, errors in the electric energy measuring device are eliminated, and the measuring precision is improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (12)

1. A current measuring mechanism is characterized by comprising a magnetic core, a Hall element, an insulating layer, a control module, at least two sets of secondary compensation coils with different turn ratios and at least two secondary driving modules;
an open slot is arranged on the magnetic core, and the Hall element is placed in the open slot;
each secondary side compensation coil is wound on the magnetic core, and different secondary side compensation coils are isolated through the insulating layer;
each secondary side compensation coil corresponds to one secondary side driving module;
the input end of the secondary side driving module is electrically connected with the Hall element, and the output end of the secondary side driving module is electrically connected with the input end of the secondary side compensating coil;
the secondary driving module is used for generating a target secondary compensation current according to the Hall current output by the Hall element and inputting the target secondary compensation current to the secondary compensation coil;
the target secondary side compensation current is used for keeping the Hall element in a working state of zero magnetic flux;
the first current measurement ranges corresponding to the secondary side compensation coils with different turn ratios form a target current measurement range;
the target current measurement range includes the first current measurement range;
the control module is electrically connected with the output end of each secondary side driving module;
the control module is used for obtaining the target secondary compensation current, obtaining a target primary current according to the target secondary compensation current, and controlling the other secondary compensation coil to start working when the target primary current exceeds a current measurement range corresponding to the currently started secondary compensation coil, wherein the current measurement range of the other secondary compensation coil is continuous with the current measurement range corresponding to the currently started secondary compensation coil.
2. The current-measuring mechanism of claim 1, wherein the control module comprises a digital-to-analog conversion unit and a calculation unit;
the digital-to-analog conversion unit is used for performing digital-to-analog conversion on the acquired target secondary compensation current and sending the digital-to-analog converted target secondary compensation current to the calculation unit;
and the calculating unit calculates the target primary side current according to the target secondary side compensation current after digital-to-analog conversion.
3. The current measurement mechanism of claim 1, wherein the secondary drive module comprises an amplifier;
the input end of the amplifier is electrically connected with the Hall element, and the output end of the amplifier is electrically connected with the input end of the secondary side compensating coil;
the amplifier is used for amplifying the Hall current output by the Hall element and sending the amplified Hall current to the secondary side compensation coil.
4. The current measurement mechanism of claim 3, wherein the secondary drive module further comprises a first transistor, a second transistor, and a first resistor;
the output end of the amplifier is respectively and electrically connected with the base electrode of the first triode and the base electrode of the second triode;
the collector electrode of the first triode and the collector electrode of the second triode are both electrically connected with a power supply end;
the emitting electrode of the first triode and the emitting electrode of the second triode are electrically connected with the input end of the secondary side compensation coil;
the collector of the first triode and the collector of the second triode are used for outputting the target secondary side compensation current and inputting the target secondary side compensation current to the input end of the secondary side compensation coil;
the other end of the secondary side compensation coil is electrically connected with one end of the first resistor, and the other end of the first resistor is grounded.
5. An electric energy measuring device characterized by comprising the current measuring mechanism of any one of claims 1 to 4;
wherein the target primary current is a current on a first current conductor passing through the magnetic core.
6. The electrical energy measurement device according to claim 5, wherein the control module is configured to calculate performance parameters of the device under test according to the target primary current and the voltage signal of the device under test;
wherein the performance parameters include power and/or electrical energy.
7. The power measurement device of claim 6, further comprising a first reference circuit, a first enable control circuit, and a current output circuit;
the first reference circuit is used for generating a calibration current value and inputting the calibration current value to a second electrifying wire;
wherein the second electrically conductive wire passes through the magnetic core;
the secondary driving module is used for outputting a first calibration secondary compensation current according to the calibration current value and inputting the first calibration secondary compensation current to the control module;
the control module is used for obtaining a first current corresponding to the second conducting wire according to the first calibration secondary side compensation current, calculating a first difference value between the first current and the calibration current value, and generating a first control instruction and sending the first control instruction to the first enabling control circuit when the first difference value is larger than or equal to a first set threshold value;
the first enabling control circuit is used for controlling the current output circuit to input set current to the input end of the secondary side compensation coil according to the first control instruction until the first difference is smaller than the first set threshold value.
8. The power measurement device of claim 7, further comprising a first communication interface circuit and a first power supply circuit;
the first communication interface circuit is electrically connected with the control module;
the first communication interface circuit is used for acquiring the performance parameters corresponding to the tested device and outputting the performance parameters to an external device;
the first power supply circuit is used for supplying power to the electric energy measuring device.
9. An electric energy measuring device characterized by comprising the current measuring mechanism of any one of claims 1 to 4;
the current measuring mechanism also comprises at least two primary coils with different turn ratios;
different primary side coils are isolated through the insulating layer;
the primary side coils with different turn ratios correspond to first voltage measurement ranges, and the first voltage measurement ranges form a target voltage measurement range;
the target voltage measurement range includes the first voltage measurement range;
the target primary side current is the current in the primary side coil;
the control module is used for acquiring a target voltage corresponding to the tested device according to the target primary side current.
10. The electrical energy measurement device of claim 9, wherein the control module is configured to calculate performance parameters of the device under test according to the target voltage and the target primary current of the device under test;
wherein the performance parameters include power and/or electrical energy.
11. The electrical energy measurement device of claim 10, wherein a calibration primary coil for calibration is wound around the magnetic core;
the electric energy measuring device also comprises a second reference circuit, a second enabling control circuit and a voltage output circuit;
the second reference circuit is used for generating a calibration voltage value and inputting the calibration voltage value to the calibration primary coil;
the secondary side driving module is used for outputting a second calibration secondary side compensation current according to the calibration voltage value and inputting the second calibration secondary side compensation current to the control module;
the control module is used for acquiring a second current corresponding to the calibration primary coil according to the second calibration secondary compensation current and acquiring a first voltage value according to the second current;
the control module is further configured to calculate a second difference between the first voltage value and the calibration voltage value, and when the second difference is greater than or equal to a second set threshold, generate a second control instruction and send the second control instruction to the second enable control circuit;
the second enabling control circuit is used for controlling the voltage output circuit to input a set voltage into the primary coil according to the second control instruction until the second difference value is smaller than the second set threshold value.
12. The power measurement device of claim 11, wherein the power measurement device further comprises a second communication interface circuit and a second power supply circuit;
the second communication interface circuit is electrically connected with the control module;
the second communication interface circuit is used for acquiring the performance parameters corresponding to the tested equipment and outputting the performance parameters to external equipment;
the second power supply circuit is used for supplying power to the electric energy measuring device.
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