CN113156217A - Measuring device and method for hollow large inductor - Google Patents
Measuring device and method for hollow large inductor Download PDFInfo
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- CN113156217A CN113156217A CN202110446980.8A CN202110446980A CN113156217A CN 113156217 A CN113156217 A CN 113156217A CN 202110446980 A CN202110446980 A CN 202110446980A CN 113156217 A CN113156217 A CN 113156217A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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Abstract
A measuring device and method of hollow large inductance comprises a main circuit and a control unit, wherein the main circuit comprises a main circuit part and a measuring joint, the main circuit part comprises a direct current power supply, a controlled electronic switch, a current Hall sensor and an inductance coil to be measured, the direct current power supply, the controlled electronic switch, the current Hall sensor and the measuring joint are connected in series, and the measuring joint is also connected with a diode in parallel; the device and the method adopt the direct current power supply to supply power, and the inductance value is measured by utilizing the transient process of the electrification of the inductor, so that the resistance value of the inductance coil is constant in the whole measuring process, and the change of the value along with the frequency in the traditional method is avoided; the current value range is preferably 10% -90% of a steady state value, the current at the stage is an interval with obvious numerical value change increasing trend in a current-time change curve, and the value recording at the stage is accurate.
Description
The technical field is as follows:
the invention relates to the technical field of measurement of inductance of a large inductance coil, in particular to a device and a method for measuring hollow large inductance.
Background art:
the traditional inductance measuring method usually adopts a mode of inductance and capacitance resonance, under the condition that a capacitor adopts a standard capacitor, the capacitance can be used as a constant, the capacitance and the working frequency are adjusted to enable the capacitance and the working frequency to reach a resonance state, the frequency during resonance is recorded, and therefore the resonance formula is used according to
Calculating inductance, when the inductance is larger, the inductance of the air-core coil is largerWhen big, the required coil number of turns is more, and wire resistance is great, and energy loss increases when leading to measuring on the one hand, and on the other hand, because the existence of skin effect, wire resistance changes along with the change of frequency to accurate judgement to the resonance state brings certain difficulty, if can not correctly catch resonant frequency, then the measurement error of inductance can greatly increased, appears measuring at every turn or the measurement of different people even, the condition of great deviation appears in its measuring result.
The invention content is as follows:
in order to solve the above problems and overcome the deficiencies of the prior art, the present invention provides a measuring device and method for hollow large inductance with accurate measurement results.
In order to achieve the purpose, the measuring device of the hollow large inductor comprises a main circuit and a control unit, wherein the main circuit comprises a main circuit part and a measuring joint, the main circuit part comprises a direct current power supply, a controlled electronic switch, a current Hall sensor and an inductance coil to be measured, the direct current power supply, the controlled electronic switch, the current Hall sensor and the measuring joint are connected in series, and the measuring joint is also connected with a diode in parallel; the control unit comprises a controller, a drive amplification isolation circuit and a current sampling conditioning circuit; the controlled electronic switch comprises an A end and a K end which are connected with the drive amplification isolation circuit and a G end which is connected with the control circuit; the current sampling conditioning circuit is connected with the current Hall sensor through a line.
A measuring method adopting the measuring device comprises the following steps:
the first step is as follows: and connecting the inductance coil to be measured with the measuring joint.
The second step is that: the current sampling conditioning circuit reads the current of the main circuit collected by the current Hall sensor in real time; the steady state current value is recorded. After the steady-state current value is closed, namely the controlled electronic switch, the current sampling conditioning circuit reads the current value which is not changed any more and is acquired by the current Hall sensor.
The third step: and the amplifying and isolating circuit is driven to send a disconnection instruction to the controlled electronic switch, the inductor to be tested and the parallel diode form a passage, and the electric quantity of the inductor to be tested is discharged until the electric quantity of the inductor to be tested returns to zero.
The fourth step: the current sampling conditioning circuit reads the current of the main circuit collected by the current Hall sensor in real time, and the controller starts timing at the same time.
The fifth step: the controller records M when the current reaches the steady-state current value1% time required t1(ii) a The controller then records M when the current reaches the steady state current value2% time required t2And then until the recording current reaches M of the steady-state current valueN% time required tN。
And a sixth step: calculating an inductance value according to a formula;
setting the current in the circuit to
According to kirchhoff's voltage law, the following can be known:
solving the above equation can obtain the time-varying relationship of the current in the circuit as:
from the above equation, when the circuit reaches steady state, the current is:
further, the current value range is preferably 10% -90% of the steady state value.
The invention has the beneficial effects that: the device and the method adopt the direct current power supply to supply power, and the inductance value is measured by utilizing the transient process of the electrification of the inductor, so that the resistance value of the inductance coil is constant in the whole measuring process, and the change of the value along with the frequency in the traditional method is avoided; the current value range is preferably 10% -90% of a steady state value, the current at the stage is an interval with obvious numerical value change increasing trend in a current-time change curve, and the value recording at the stage is accurate.
Description of the drawings:
FIG. 1 is a schematic diagram of an inductance measurement circuit of the present invention;
FIG. 2 is a schematic diagram of a current sampling conditioning circuit of the present invention;
FIG. 3 is a schematic diagram of a driver amplifier isolation circuit of the present invention.
The specific implementation mode is as follows:
in order to make the implementation objects, technical solutions and advantages of the present invention clearer, the present invention will be described in more detail below with reference to the accompanying drawings of the present invention.
In the description of the present invention, it is to be understood that the description indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the measuring device of the hollow large inductor comprises a main circuit and a control unit, wherein the main circuit comprises a direct current power supply, a controlled electronic switch, a current hall sensor and a measuring joint connected with an inductance coil to be measured, which are connected in series, and the measuring joint is also connected with a diode in parallel; the control unit comprises a controller, a drive amplification isolation circuit and a current sampling conditioning circuit; the controlled electronic switch comprises an A end and a K end which are connected with the drive amplification isolation circuit and a G end which is connected with the control circuit; the current sampling conditioning circuit is connected with the current Hall sensor through a line.
The controlled electronic switch is a three-terminal structure, wherein the A terminal and the K terminal are connected into the main circuit, the G terminal is connected with the control circuit and is connected with the instruction of the control circuit, when the G terminal receives the control instruction, the A terminal and the K terminal are connected and are equivalent to the on state of an ideal switch, current flows through the circuit, otherwise, the switch is disconnected, and the current in the circuit is zero. The controlled electronic switch is mature in technology, such as British Flow FF450R33T3E 3.
The A end is the anode of the electronic switch, the K end is the cathode, and the G end is the control electrode. When the voltage between the G terminal and the K terminal is zero or negative voltage, the A terminal and the K terminal are in an off state, and the A terminal and the K terminal bear the voltage of the main circuit. When a trigger voltage is applied between the terminal G and the terminal K, and the terminal A and the terminal G bear positive anode voltage, the terminal A and the terminal G are connected, and the voltage between the terminal A and the terminal K is zero.
The diode is connected in parallel at two ends of the inductor to be tested in an anti-parallel mode, the diode is used for blocking reversely when the electronic switch K of the circuit is switched on, the transient process of the circuit is not affected, and when the electronic switch is switched off, the diode can provide a follow current path for inductor energy to prevent the generation of inductor overvoltage. The current sensor is electrically isolated from the circuit and does not affect the circuit state, but can linearly convert the current in the circuit into a voltage model through the Hall effect and input the signal into the controller. The resistance R is the equivalent resistance value of the whole loop. The voltage needs to ensure the full-scale output of the current Hall in a steady state
The controller adopts a DSP or a singlechip, an A/D sampling unit and an I/O interface unit are both in-chip resources of the controller, taking the DSP as an example, the range of voltage received by a sampling circuit is 0V-3.3V, the output voltage range of a current Hall is generally 0V-5V, therefore, in order to match the voltage, a current sampling conditioning circuit is designed, the current sampling conditioning circuit is a linear conditioning circuit and can realize the filtering and shaping of an input signal, an input AI2 is the output of a Hall current sensor, an output AIN2 is an A/D sampling unit which outputs to the DSP, and the signal AI2 and the signal AIN2 have a good linear relation.
Because the on-chip I/O interface of the DSP can only provide a voltage square wave signal of 0V-5V, and the driving current is limited, and cannot provide the working voltage and the working current required by the controlled switch, a driving amplification isolation circuit is designed between the controller and the controlled switch, the OC1 signal of the driving amplification isolation circuit is connected with the on-chip I/O interface of the DSP, the Y1 signal is connected with the control electrode of the controlled switch, when the OC1 is at a high level, the Y1 outputs a low level signal, the controlled switch is at a disconnected state, otherwise when the OC1 is at a low level, the Y1 outputs a high level signal, the controlled switch is switched on, and in order to prevent the signal of the controlled switch from causing interference to the weak current signal of the DSP, the isolation amplification circuit adopts an optical coupler for isolation, thereby realizing the electrical isolation of the strong and weak current signals.
A measuring method adopting the measuring device comprises the following steps:
the first step is as follows: and connecting the inductance coil to be measured with the measuring joint.
The second step is that: the current sampling conditioning circuit reads the current of the main circuit collected by the current Hall sensor in real time; the steady state current value is recorded. After the steady-state current value is closed, namely the controlled electronic switch, the current sampling conditioning circuit reads the current value which is not changed any more and is acquired by the current Hall sensor.
The third step: and the amplifying and isolating circuit is driven to send a disconnection instruction to the controlled electronic switch, the inductor to be tested and the parallel diode form a passage, and the electric quantity of the inductor to be tested is discharged until the electric quantity of the inductor to be tested returns to zero.
The fourth step: the current sampling conditioning circuit reads the current of the main circuit collected by the current Hall sensor in real time, and the controller starts timing at the same time.
The fifth step: the controller records M when the transient current reaches the steady-state current value1% time required t1(ii) a The controller then records M when the current reaches the steady state current value2% time required t2And then until the recording current reaches a steady stateM of the value of the current in stateN% time required tN。
And a sixth step: calculating an inductance value according to a formula;
assume that the current in the circuit is
According to kirchhoff's voltage law, the following can be known:
solving the above equation can obtain the time-varying relationship of the current in the circuit as:
from the above equation, when the circuit reaches steady state, the current is:
further, the current value range is preferably 10% -90% of the steady state value.
The accuracy of inductance measurement is closely related to the time of transient current of the inductance rising from 10% to 90% of a steady-state current value, namely how to accurately capture the time of 10% -90% of the steady-state current value;
the first step is as follows: presetting M% of steady-state current value of inductor as IMAccording to the sampling transformation ratio relation, after the transient current is sampled by the current Hall sensor, the corresponding digital quantity is IMsam；
The second step is that: after the controlled electronic switch is closed, the current Hall sensor samples the corresponding digital quantity I of the inductive transient currentxsam
The third step: will IxsamAnd IMsamMaking a comparison when Ixsam=IMsamDefining the transient state of the inductor at that momentThe time when the current is equal to the steady-state current value M% is set as tM1；
The fourth step: at tM1Then, the sampling times are counted, and if the sampling times are continuously N times, the obtained transient current I is obtainedxsamIs always greater than IMsamThen t isM1The final value is used for calculating the inductance value; if tM1N (n) th after the time<N) sub-sampling to obtain transient current smaller than IMsamThen, when the current Hall sensor samples the corresponding digital quantity I of the inductive transient currentxsamIs again equal to IMsamWhen is marked as tM2And at tM2The transient current of the inductor obtained by the subsequent N times of sampling is larger than IMsamThen, the time corresponding to M% of the steady-state current value of the inductor is adjusted to tM2；If t isM2N (n) th after the time<N) sub-sampling to obtain transient current smaller than IMsamThen, the step is repeated to re-determine the moment when the transient current of the inductor is equal to the steady-state current value M%.
Example 1
The first step is as follows: the preset inductance steady-state current value is 10 percent of I10According to the sampling transformation ratio relation, after the transient current is digitally sampled, the corresponding digital quantities are I respectively1sam；
The second step is that: after the controlled electronic switch is closed, firstly, the digital quantity I corresponding to the inductance transient current obtained by actual sampling is obtainedxsam
The third step: and I1samMaking a comparison when Ixsam=I1samDefining an ideal time when the transient current of the inductor is equal to 10% of the steady-state current value at the moment, and setting the ideal time as t101；
The fourth step: at t101Then, the sampling times are counted, and if the sampling times are continuously N times, the obtained transient current I is obtainedxsamIs always greater than I1samThen t is101,The final value is used for calculating the inductance value; if t101N (n) th after the time<N) sub-sampling to obtain transient current smaller than I1samThen, when the current Hall sensor samples the corresponding digital quantity I of the inductive transient currentxsamIs again equal to I1samTime and memoryIs t102And at tM2The transient current of the inductor obtained by the subsequent N times of sampling is larger than I1samThen, the time corresponding to M% of the steady-state current value of the inductor is adjusted to t102；If t is102N (n) th after the time<N) sub-sampling to obtain transient current smaller than I1samThen the step is repeated to re-determine the moment when the transient current of the inductor is equal to 10% of the steady-state current value.
When the current reaches 10% of the steady state value, the time required is: t1=0.10536
。
Claims (3)
1. The measuring device of the hollow large inductance is characterized by comprising a main circuit and a control unit, wherein the main circuit comprises a main circuit part, a direct current power supply, a controlled electronic switch, a current Hall sensor and a measuring joint, the direct current power supply, the controlled electronic switch, the current Hall sensor and the measuring joint are connected in series, the measuring joint is connected with an inductance coil to be measured, and a diode is also connected in parallel; the control unit comprises a controller, a drive amplification isolation circuit and a current sampling conditioning circuit; the controlled electronic switch comprises an A end and a K end which are connected with the drive amplification isolation circuit and a G end which is connected with the control circuit; the current sampling conditioning circuit is connected with the current Hall sensor through a line.
2. A measuring method using the apparatus of claim 1, characterized by the steps of:
the first step is as follows: connecting an inductance coil to be measured with a measuring joint;
the second step is that: the current sampling conditioning circuit reads the current of the main circuit collected by the current Hall sensor in real time; recording the steady-state current value;
the third step: the amplification isolation circuit is driven to send a disconnection instruction to the controlled electronic switch, the inductor to be tested and the parallel diode form a passage, and the electric quantity of the inductor to be tested is discharged until the electric quantity of the inductor to be tested returns to zero;
the fourth step: the current sampling conditioning circuit reads the current of the main circuit collected by the current Hall sensor in real time, and the controller starts timing;
the fifth step: the controller records M when the current reaches the steady-state current value1% time required t1(ii) a The controller then records M when the current reaches the steady state current value2% time required t2And then until the recording current reaches M of the steady-state current valueN% time required tN；
And a sixth step: calculating an inductance value according to a formula;
setting the current in the circuit to
According to kirchhoff's voltage law, the following can be known:
solving the above equation can obtain the time-varying relationship of the current in the circuit as:
from the above equation, when the circuit reaches steady state, the current is:
3. the measurement method according to claim 2, characterized in that the current range preferably ranges from 10% to 90% of the steady state value.
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| CN202110446980.8A CN113156217A (en) | 2021-04-25 | 2021-04-25 | Measuring device and method for hollow large inductor |
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| CN202110446980.8A CN113156217A (en) | 2021-04-25 | 2021-04-25 | Measuring device and method for hollow large inductor |
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2021
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Application publication date: 20210723 |