CN219657756U - Miniature heavy current measuring circuit and device with same - Google Patents
Miniature heavy current measuring circuit and device with same Download PDFInfo
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- CN219657756U CN219657756U CN202320257020.1U CN202320257020U CN219657756U CN 219657756 U CN219657756 U CN 219657756U CN 202320257020 U CN202320257020 U CN 202320257020U CN 219657756 U CN219657756 U CN 219657756U
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Abstract
The utility model relates to a miniature heavy-current measuring circuit and a device with the same, wherein the miniature heavy-current measuring circuit comprises a magnetic core group and a cable for accessing a measured current signal; the driving module is electrically connected with the magnetic core group and is used for generating an excitation signal and outputting an error signal; the amplifying module is electrically connected with the driving module and is used for receiving the error signal and outputting compensation current to the magnetic core group; the sampling resistor is respectively and electrically connected with the amplifying module and the magnetic core group, and the compensation current flows into the amplifying module through the sampling resistor after passing through the magnetic core group; the signal output module is electrically connected with the sampling resistor and is used for amplifying the compensation voltage on the sampling resistor and then outputting an integral signal; wherein the overall signal is proportional to the measured current signal. The whole signal after compensation is not affected by temperature, and the whole signal is in proportion to the measured current, so that the utility model can be applied to the working process of new energy equipment, thereby realizing the purpose of measuring the large current signal, and the measurement result is more accurate.
Description
Technical Field
The utility model relates to the field of current measurement, in particular to a miniature high-current measurement circuit and a device with the same.
Background
Along with the continuous innovation and development of new energy technology, new energy equipment is optimized and upgraded, and the method is particularly important for measuring various technical parameters of the new energy equipment in the working process, especially for measuring large current of the new energy equipment in a high-density mini-type environment.
At present, the device for measuring the large current mainly comprises a current transformer and a Hall current sensor, wherein the principle of the current transformer is similar to that of a transformer, the current transformer works by means of electromagnetic induction, the structure is simple, the cost is low, but the current transformer can only measure alternating current, and the dynamic range is low. The Hall current sensor mainly converts magnetism into voltage on a Hall plate by utilizing the magnetism gathering effect of a magnetic core, and the measured current is reversely calculated according to the relation between the magnetism and the voltage, so that the problem that a current transformer can only measure alternating current is solved, but the Hall current sensor is poor in integral precision and large in temperature drift, is not suitable for working under the high-temperature condition, and cannot meet the use requirement of measuring the large current of the Hall current sensor in the working process of new energy equipment.
Disclosure of Invention
In view of the above, the present utility model provides a micro high-current measurement circuit and a device having the same, so as to solve the above-mentioned problems.
According to an aspect of the present utility model, there is provided a micro high-current measurement circuit including:
the magnetic core group is used for accessing a cable of a tested current signal;
the driving module is electrically connected with the magnetic core group and is used for generating an excitation signal and outputting an error signal;
the amplifying module is electrically connected with the driving module and is used for receiving the error signal and outputting compensation current to the magnetic core group;
the sampling resistor is respectively and electrically connected with the amplifying module and the magnetic core group, and the compensation current flows into the amplifying module through the sampling resistor after passing through the magnetic core group;
the signal output module is electrically connected with the sampling resistor and is used for amplifying the compensation voltage on the sampling resistor and then outputting an integral signal;
wherein the integral signal is in direct proportion to the measured current signal.
As an alternative embodiment of the present utility model, optionally, the magnetic core set includes:
a first split magnetic core surrounding a first compensation winding, the first compensation winding being electrically connected to the amplification module;
a second notched core surrounding a second compensation winding, the second compensation winding being electrically connected to the sampling resistor;
a first high-frequency core disposed at a cutout of the first cutout core and surrounding a first excitation winding electrically connected with the driving module;
and the second high-frequency magnetic core is arranged at a notch of the second notch magnetic core and surrounds a second excitation winding, and the second excitation winding is electrically connected with the driving module.
As an alternative embodiment of the present utility model, optionally, the driving module includes a first exciting circuit, a second exciting circuit, a first demodulator and a second demodulator;
the first excitation circuit input end is electrically connected with the first excitation winding output end, and the first excitation circuit output end is electrically connected with the first demodulator input end;
the second excitation circuit input end is electrically connected with the second excitation winding output end, and the second excitation circuit output end is electrically connected with the second demodulator input end;
the output ends of the first demodulator and the second demodulator are electrically connected with the input end of the amplifying module.
As an optional embodiment of the present utility model, optionally, the driving module further includes a clock generator and a frequency multiplier;
the output end of the clock generator is respectively and electrically connected with the first excitation circuit, the first excitation circuit and the input end of the frequency multiplier;
the output end of the frequency multiplier is electrically connected with the input ends of the first demodulator and the second demodulator respectively.
As an optional embodiment of the present utility model, optionally, the amplifying module includes a first operational amplifier and a power amplifier;
the two input ends of the first operational amplifier are respectively and electrically connected with the output end of the first demodulator and the output end of the second demodulator, the output end of the first operational amplifier is electrically connected with the input end of the power amplifier, and the input end of the power amplifier is also electrically connected with the sampling resistor;
the output end of the power amplifier is electrically connected with the input end of the first compensation winding.
As an optional embodiment of the present utility model, optionally, the signal output module includes a second operational amplifier;
the second operational amplifier input end is electrically connected with the sampling resistor, and the second operational amplifier output end outputs the integral signal.
As an alternative embodiment of the utility model, optionally, the first compensation winding is connected in series with the second compensation winding.
As an optional embodiment of the present utility model, optionally, an overload protection module is further included;
the overload protection module is electrically connected with the driving module.
As an optional embodiment of the present utility model, optionally, a power protection module is further included;
the power protection module is electrically connected with the driving module.
According to another aspect of the present utility model, there is provided a micro high current measurement device comprising a micro high current measurement circuit as described in any one of the above and a housing.
The utility model has the beneficial effects that:
the utility model provides a miniature heavy current measuring circuit which is applied to high-density environments such as new energy equipment and the like to meet the requirement of high-precision current measurement, namely the miniature heavy current measuring circuit can be used for realizing heavy current measurement in a miniature structure and is suitable for high-temperature working environments. The device specifically comprises a magnetic core group, a driving module, an amplifying module, a sampling resistor and a signal output module. Specifically, when the measuring circuit of the utility model does not start measuring the cable to be measured, namely, the measured current ip=0, the magnetic core group is in a dynamic magnetic balance state. When the measuring circuit is sampled to measure the current of the cable to be measured, the magnetic core group bites the cable to be measured, the introduction of the measured current signal breaks the magnetic balance state, after unbalance is detected by the driving module, an error signal caused by unbalance is sent to the amplifying module, compensation current is output to the magnetic core group by the amplifying module, the magnetic potential direction generated by the compensation current on the magnetic core group is opposite to the magnetic potential direction generated by the measured current, and the measured current signal Ip is in proportional relation with the compensation current, so that the magnetic potential of the magnetic core group is restored to the initial dynamic magnetic balance stage. Furthermore, the sampling resistor is electrically connected with the amplifying module and the magnetic core group, the compensating current output by the amplifying module flows into the sampling resistor after passing through the magnetic core group, the compensating voltage at two ends of the sampling resistor is obtained by combining the resistance value of the sampling resistor, the compensating voltage is amplified and output through the signal output module, namely the output integral signal and the tested current Ip are in proportional relation, so that the purpose of measuring the tested current is realized, the compensated integral signal is not affected by temperature, the measuring result is more accurate, and the measuring effect is better when the measuring device is applied to the working process of new energy equipment.
Other features and aspects of the present utility model will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the utility model and together with the description, serve to explain the principles of the utility model.
FIG. 1 shows a schematic diagram of a miniature high-current measurement circuit according to an embodiment of the present utility model;
fig. 2 shows a magnetic flux coordinate diagram of a magnetic core group of a miniature high-current measurement circuit according to an embodiment of the present utility model.
Detailed Description
Various exemplary embodiments, features and aspects of the utility model will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
It should be understood, however, that the terms "center," "longitudinal," "transverse," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the utility model or simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following description in order to provide a better illustration of the utility model. It will be understood by those skilled in the art that the present utility model may be practiced without some of these specific details. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present utility model.
As shown in fig. 1, the micro high-current measurement circuit includes:
a magnetic core group 100 for accessing a cable of a measured current signal;
the driving module 200 is electrically connected with the magnetic core group 100 and is used for generating an excitation signal and outputting an error signal;
an amplifying module 300 electrically connected to the driving module 200, for receiving the error signal and outputting a compensation current to the magnetic core set 100;
the sampling resistor 400 is electrically connected with the amplifying module 300 and the magnetic core set 100 respectively, and the compensation current flows into the amplifying module 300 through the sampling resistor 400 after passing through the magnetic core set 100;
the signal output module 500 is electrically connected with the sampling resistor 400 and is used for amplifying the compensation voltage on the sampling resistor 400 and then outputting an overall signal;
wherein the integral signal is in direct proportion to the measured current signal.
In this embodiment, a micro high-current measurement circuit is provided, which is applied in high-density environments such as new energy equipment, so as to meet the requirement of high-precision current measurement, i.e. the measurement circuit can be used for realizing high-current measurement in a microstructure. The circuit specifically comprises a magnetic core group 100, a driving module 200, an amplifying module 300, a sampling resistor 400 and a signal output module 500. When the measuring circuit of the present utility model does not start measuring the cable to be measured, i.e. the measured current ip=0, the magnetic flux inside the magnetic core set 100 is in a dynamic magnetic balance state as shown in fig. 2 (a), and the time domain expansion is as shown in fig. 2 (c). When the measuring circuit of the present utility model is sampled to measure the current of the cable to be measured, the magnetic core set 100 bites the cable to be measured, the introduction of the measured current signal breaks the magnetic balance state, after the unbalance is detected by the driving module 200, the error signal caused by the unbalance is sent to the amplifying module 300, the error signal is as shown in fig. 2 (d), and the amplifying module 300 outputs the compensation current to the magnetic core set 100, the magnetic potential direction generated by the compensation current on the magnetic core set 100 is opposite to the magnetic potential direction generated by the measured current, and the measured current signal Ip is in proportion to the compensation current, so that the magnetic potential of the magnetic core set 100 is restored to the initial dynamic magnetic balance stage. Furthermore, the sampling resistor 400 is electrically connected with the amplifying module 300 and the magnetic core group 100 at the same time, the compensation current output by the amplifying module 300 flows into the sampling resistor 400 after passing through the magnetic core group 100, the compensation voltage at two ends of the sampling resistor 400 is obtained by combining the resistance value of the sampling resistor 400, the compensation voltage is amplified and then output through the signal output module 500, namely, the output integral signal and the measured current Ip are in a proportional relation, so that the purpose of measuring the measured current is realized, the compensated integral signal is not influenced by temperature, the measurement result is more accurate, the measuring effect is better, and the measuring device can be applied to the working process of new energy equipment.
Further, as an alternative embodiment of the present utility model, optionally, the magnetic core set 100 includes:
a first split core 110 surrounding a first compensation winding 111, said first compensation winding 111 being electrically connected to said amplification module 300;
a second notched core 120 surrounding a second compensation winding 121, the second compensation winding 121 being electrically connected to the sampling resistor 400;
a first high-frequency core 130 disposed at a cutout of the first cutout core 110 and surrounding a first excitation winding 131, the first excitation winding 131 being electrically connected with the driving module 200;
a second high frequency core 140 disposed at the slit of the second slit core 120 and surrounding a second excitation winding 141, the second excitation winding 141 being electrically connected with the driving module 200.
In this embodiment, the core set 100 includes a first notch core 110 surrounding the first compensation winding 111, a second notch core 120 surrounding the second compensation winding 121, the first notch core 110 and the second notch core 120 are high-permeability notch cores, the notch positions of the first notch core 110 and the second notch core 120 are electrically connected to a first high-frequency core 130 and a second high-frequency core 140, and the first high-frequency core 130 and the second high-frequency core 140 are correspondingly surrounded by a first excitation winding 131 and a second excitation winding 141. The first notched magnetic core 110 and the second notched magnetic core 120 are both in a semicircular structure, and the structure is smaller, for example, the via hole is 5mm, so that the current measurement requirement of the new energy device in a high-density environment is met. It should be noted that, when the measured current is measured, the first excitation winding 131 and the second excitation winding 141 are electrically connected with the driving module 200, the dynamic magnetic balance is broken by the access of the measured current, the driving module 200 outputs an error signal after detecting, the compensating current is output to the first compensating winding 111 through the amplifying module 300, and is transmitted to the sampling resistor 400 through the second compensating winding 121, the compensating voltage at two ends of the sampling resistor 400 can be obtained according to the resistance value of the sampling resistor 400 and the compensating current flowing through the sampling resistor 400, the magnitude of the whole signal is obtained through the output of the second operational amplifier A2 of the signal output module 500, and the magnitude of the measured current Ip can be obtained according to the magnitude of the whole signal by adopting the measuring circuit of the utility model, so that the purpose of measuring the measured current is realized, the temperature drift problem is effectively improved, and the measuring result is more accurate.
Specifically, the proportional relationship between the measured current signal and the compensating current flowing through the first compensating winding 111 and the second compensating winding 121 Is ip=n×is, where Ip Is the measured current signal, N Is the sum of the turns of the first compensating winding 111 and the second compensating winding 121, and Is the compensating current; further, the compensation voltage of the compensation current flowing through the sampling resistor 400 Is u=is×r, where Is the compensation current, and R Is the resistance value of the sampling resistor 400; further, after the sampled voltage is amplified by the second operational amplifier A2, the sampled voltage is output as an overall signal, specifically uo=a×u, where U is the sampled voltage on the sampling resistor 400, and a is the amplification factor of the second operational amplifier A2.
In summary, u=ais=asr=asr Ip/N, where A, R, N Is a constant, and the overall signal output by the second operational amplifier A2 Is in a proportional relationship with the measured current signal, so as to achieve the purpose of accurately measuring the measured current, and Is not affected by high temperature. Meanwhile, the measured current is in direct proportion to the magnitude relation of the compensation current, and the proportionality coefficient is the number of turns N of the compensation winding, so that the utility model can enlarge the actual measurement range by increasing the number of turns.
As an alternative embodiment of the present utility model, the driving module 200 optionally includes a first exciting circuit 210, a second exciting circuit 220, a first demodulator 230 and a second demodulator 240;
the input end of the first exciting circuit 210 is electrically connected with the output end of the first exciting winding 131, and the output end of the first exciting circuit 210 is electrically connected with the input end of the first demodulator 230;
the input end of the second exciting circuit 220 is electrically connected with the output end of the second exciting winding 141, and the output end of the second exciting circuit 220 is electrically connected with the input end of the second demodulator 240;
the output terminals of the first demodulator 230 and the second demodulator 240 are electrically connected to the input terminal of the amplifying module 300.
Further, as an alternative embodiment of the present utility model, optionally, the driving module 200 further includes a clock generator and a frequency multiplier;
the output end of the clock generator is respectively and electrically connected with the first excitation circuit 210, the first excitation circuit 210 and the input end of the frequency multiplier;
the output terminals of the frequency doubler are electrically connected to the input terminals of the first demodulator 230 and the second demodulator 240, respectively.
In this embodiment, the first exciting circuit 210 is electrically connected to the output end of the first exciting winding 131, the output end of the first exciting circuit 210 is electrically connected to the input end of the first demodulator 230, that is, after the measured current signal is connected to the magnetic core set 100 to break the magnetic balance, the exciting signal on the first exciting circuit 210 is output to the amplifying module 300 through the first demodulator 230 as the first error source; the second excitation circuit 220 is electrically connected to the output end of the second excitation winding 141, the output end of the second excitation circuit 220 is electrically connected to the input end of the first demodulator 230, the excitation signal on the second excitation circuit 220 is output to the amplifying module 300 through the second demodulator 240 as a second error source, and the integrated error signal is input to the amplifying module 300, so that the amplifying module 300 outputs the compensation current according to the error signal.
As an alternative embodiment of the present utility model, optionally, the amplifying module 300 includes a first operational amplifier A1 and a power amplifier 310;
two input ends of the first operational amplifier A1 are electrically connected to the output end of the first demodulator 230 and the output end of the second demodulator 240, respectively, the output end of the first operational amplifier A1 is electrically connected to the input end of the power amplifier 310, and the input end of the power amplifier 310 is also electrically connected to the sampling resistor 400;
the output of the power amplifier 310 is electrically connected to the input of the first compensation winding 111.
In this embodiment, the amplifying module 300 includes a first operational amplifier A1 and a power amplifier 310, specifically, the first demodulator 230 and the second demodulator 240 are electrically connected to the input terminal of the first operational amplifier A1, the output terminal of the first operational amplifier A1 is electrically connected to the input terminal of the power amplifier 310, the error signal integrated by the first operational amplifier A1 is input to the power amplifier 310, the power amplifier 310 outputs the compensation current to the first compensation winding 111, and the second compensation winding 121 outputs the compensation current to the sampling resistor 400. The direction of the magnetic potential generated by the compensation current on the compensation winding is opposite to that of the magnetic potential generated by the measured current, so that the magnetic potential of the magnetic core group 100 can return to the initial balance state through the compensation current, and the measured current is measured according to the sampling voltages at the two ends of the amplified sampling resistor 400.
As an alternative embodiment of the present utility model, optionally, the signal output module 500 includes a second operational amplifier A2;
the input end of the second operational amplifier A2 is electrically connected with the sampling resistor 400, and the output end of the second operational amplifier A2 outputs the integral signal.
In this embodiment, the sampling resistor 400 is electrically connected to the second operational amplifier A2, and when the compensation current flows through the sampling resistor 400, the compensation voltage is obtained through the resistance value of the sampling resistor 400 and the compensation current, and the second operational amplifier A2 is utilized to amplify and output the compensation voltage as an overall signal, so as to obtain the magnitude of the measured current according to the proportional relationship between the overall signal and the measured current.
As an alternative embodiment of the utility model, optionally, the first compensation winding 111 is connected in series with the second compensation winding 121.
As an alternative embodiment of the present utility model, an overload protection module 600 is optionally further included;
the overload protection module 600 is electrically connected to the driving module 200.
Further, as an optional embodiment of the present utility model, optionally, a power protection module 700 is further included;
the power protection module 700 is electrically connected to the driving module 200.
In this embodiment, the measuring circuit of the present utility model further includes an overload protection module 600 and a power protection module 700, specifically, the overload protection module 600 monitors the magnetic saturation state in the magnetic core set 100, and when the measured current exceeds the rated current, the overload protection module 600 is started to prevent the measuring circuit of the present utility model from being damaged. Meanwhile, the surge voltage on the power supply is prevented from damaging the measuring circuit of the utility model by the power supply protection module 700, and the normal measurement of the measured current is ensured.
According to another aspect of the present utility model, there is provided a micro high current measurement device comprising a micro high current measurement circuit as described in any one of the above and a housing.
The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A miniature high current measurement circuit, comprising:
the magnetic core group is used for accessing a cable of a tested current signal;
the driving module is electrically connected with the magnetic core group and is used for generating an excitation signal and outputting an error signal;
the amplifying module is electrically connected with the driving module and is used for receiving the error signal and outputting compensation current to the magnetic core group;
the sampling resistor is respectively and electrically connected with the amplifying module and the magnetic core group, and the compensation current flows into the amplifying module through the sampling resistor after passing through the magnetic core group;
the signal output module is electrically connected with the sampling resistor and is used for amplifying the compensation voltage on the sampling resistor and then outputting an integral signal;
wherein the integral signal is in direct proportion to the measured current signal.
2. The miniature high current measurement circuit of claim 1, wherein said magnetic core set comprises:
a first split magnetic core surrounding a first compensation winding, the first compensation winding being electrically connected to the amplification module;
a second notched core surrounding a second compensation winding, the second compensation winding being electrically connected to the sampling resistor;
a first high-frequency core disposed at a cutout of the first cutout core and surrounding a first excitation winding electrically connected with the driving module;
and the second high-frequency magnetic core is arranged at a notch of the second notch magnetic core and surrounds a second excitation winding, and the second excitation winding is electrically connected with the driving module.
3. The miniature high current measurement circuit of claim 2, wherein said drive module comprises a first excitation circuit, a second excitation circuit, a first demodulator and a second demodulator;
the first excitation circuit input end is electrically connected with the first excitation winding output end, and the first excitation circuit output end is electrically connected with the first demodulator input end;
the second excitation circuit input end is electrically connected with the second excitation winding output end, and the second excitation circuit output end is electrically connected with the second demodulator input end;
the output ends of the first demodulator and the second demodulator are electrically connected with the input end of the amplifying module.
4. The miniature high current measurement circuit of claim 3, wherein said drive module further comprises a clock generator and a frequency multiplier;
the output end of the clock generator is respectively and electrically connected with the first excitation circuit, the first excitation circuit and the input end of the frequency multiplier;
the output end of the frequency multiplier is electrically connected with the input ends of the first demodulator and the second demodulator respectively.
5. The miniature high current measurement circuit of claim 3, wherein said amplification module comprises a first operational amplifier and a power amplifier;
the two input ends of the first operational amplifier are respectively and electrically connected with the output end of the first demodulator and the output end of the second demodulator, the output end of the first operational amplifier is electrically connected with the input end of the power amplifier, and the input end of the power amplifier is also electrically connected with the sampling resistor;
the output end of the power amplifier is electrically connected with the input end of the first compensation winding.
6. The miniature high current measurement circuit of claim 1, wherein said signal output module comprises a second operational amplifier;
the second operational amplifier input end is electrically connected with the sampling resistor, and the second operational amplifier output end outputs the integral signal.
7. The miniature high current measurement circuit of claim 2, wherein said first compensation winding is connected in series with said second compensation winding.
8. The miniature high current measurement circuit of claim 1, further comprising an overload protection module;
the overload protection module is electrically connected with the driving module.
9. The miniature high current measurement circuit of claim 1, further comprising a power protection module;
the power protection module is electrically connected with the driving module.
10. A miniature high current measuring device comprising the miniature high current measuring circuit of any one of claims 1 to 9 and a housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320257020.1U CN219657756U (en) | 2023-02-13 | 2023-02-13 | Miniature heavy current measuring circuit and device with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320257020.1U CN219657756U (en) | 2023-02-13 | 2023-02-13 | Miniature heavy current measuring circuit and device with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219657756U true CN219657756U (en) | 2023-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320257020.1U Active CN219657756U (en) | 2023-02-13 | 2023-02-13 | Miniature heavy current measuring circuit and device with same |
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| Country | Link |
|---|---|
| CN (1) | CN219657756U (en) |
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2023
- 2023-02-13 CN CN202320257020.1U patent/CN219657756U/en active Active
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