CN112612062B - Gold inspection machine and gold inspection machine transmitting module - Google Patents
Gold inspection machine and gold inspection machine transmitting module Download PDFInfo
- Publication number
- CN112612062B CN112612062B CN202011633822.5A CN202011633822A CN112612062B CN 112612062 B CN112612062 B CN 112612062B CN 202011633822 A CN202011633822 A CN 202011633822A CN 112612062 B CN112612062 B CN 112612062B
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- Prior art keywords
- coil
- shielding
- transmitting
- secondary coil
- inspection machine
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 239000010931 gold Substances 0.000 title claims abstract description 33
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 33
- 238000007689 inspection Methods 0.000 title claims abstract description 29
- 238000004804 winding Methods 0.000 claims description 55
- 239000002184 metal Substances 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention relates to a gold inspection machine and a gold inspection machine transmitting module, wherein the gold inspection machine comprises a first driving circuit, a transmitting coil, a first receiving coil, a second receiving coil, a first shielding coil, a second shielding coil, a first receiving coil, a transmitting coil, a second receiving coil and a second shielding coil which are sequentially arranged, wherein the transmitting coil, the first shielding coil and the second shielding coil are connected to the first driving circuit, the current directions in the first shielding coil and the second shielding coil are the same, and are opposite to the current directions in the transmitting coil, and the current directions are clockwise or anticlockwise. Compared with the prior art, the invention designs the two shielding coils which are respectively positioned outside the two receiving coils, and the magnetic field directions of the two shielding coils are opposite to the magnetic field direction of the transmitting coil, so that the magnetic field of the transmitting coil can be counteracted, the metal area is reduced, and the miniaturization is facilitated, so that the layout of the gold inspection machine production line is more compact.
Description
Technical Field
The invention relates to a metal detector, in particular to a gold detector and a gold detector transmitting module.
Background
When the metal detector works, the driving circuit drives the transmitting coil to generate a stable electromagnetic field at the product passing window, the receiving coil detects the change condition of the electromagnetic field, when an object passes through the area, the electromagnetic field distribution changes due to the influence of the magnetic conductivity and the electric conductivity of the object, and after the change is detected by the receiving coil, the change can be used as a basis for judging whether metal foreign matters exist or not after being processed by a subsequent circuit.
In general, in order to improve the detection sensitivity of the machine, the driving power and frequency are properly increased, but in some situations with a narrow place, the installation distance between the metal detector and the excluder or other machines is very close, so that an interference signal is generated, and finally, the running state of the metal detector is unstable or the state of false alarm is caused.
Disclosure of Invention
The inventor of the application finds that the magnetic field generated by the transmitting coil cannot be completely enclosed in the product passing window, and a magnetic field with stronger magnetic field strength still exists around the product passing window, and the magnetic field can be influenced by the movement of objects around the probe or the electromagnetic interference of space to generate an unstable machine running state or a false alarm state, so that the machine use is seriously influenced. The inventors will refer to the area outside the product passing window that is still disturbed by the movement of the metal as the metal area. The size of the metal area restricts the miniaturization of the gold inspection machine and the layout of the gold inspection machine production line. The invention aims to provide a gold inspection machine and a gold inspection machine transmitting module, wherein two shielding coils are respectively arranged outside two receiving coils, and the magnetic field directions of the two shielding coils are opposite to the magnetic field directions of the transmitting coils, so that the magnetic field of the transmitting coils can be counteracted, a metal area is reduced, and miniaturization is facilitated, so that the layout of a gold inspection machine production line is more compact.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a machine is examined to gold, includes first drive circuit, transmitting coil and first receiving coil, second receiving coil, the machine is examined to gold still includes first shielding coil and second shielding coil, first receiving coil, transmitting coil, second receiving coil and second shielding coil arrange in proper order, transmitting coil, first shielding coil and second shielding coil all are connected to first drive circuit, and the current direction in first shielding coil and the second shielding coil is the same to all opposite with the current direction in the transmitting coil, wherein, the current direction is clockwise or anticlockwise.
The first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the first secondary coil, the second secondary coil and the third secondary coil are connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil and the third secondary coil are the same, the winding directions of the first secondary coil and the third secondary coil are opposite to the winding directions of the second secondary coil, and the winding directions of the first shielding coil, the primary coil and the second shielding coil are the same.
The first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the first secondary coil, the second secondary coil and the third secondary coil are connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil, the second secondary coil and the third secondary coil are the same, the winding directions of the first shielding coil and the second shielding coil are the same, and the winding directions of the first shielding coil and the second shielding coil are opposite to the winding directions of the primary coil.
The number of turns of the first secondary coil and the third secondary coil are the same and smaller than the number of turns of the second secondary coil.
The utility model provides a gold inspection machine transmitting module, includes first drive circuit, transmitting coil, first shielding coil and second shielding coil, first shielding coil, transmitting coil and second shielding coil arrange in proper order, transmitting coil, first shielding coil and second shielding coil all are connected to first drive circuit, and the current direction in first shielding coil and the second shielding coil is the same to all opposite with the current direction in the transmitting coil, wherein, the current direction is clockwise or anticlockwise.
The first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the first secondary coil, the second secondary coil and the third secondary coil are connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil and the third secondary coil are the same, the winding directions of the first secondary coil and the third secondary coil are opposite to the winding directions of the second secondary coil, and the winding directions of the first shielding coil, the primary coil and the second shielding coil are the same.
The first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the first secondary coil, the second secondary coil and the third secondary coil are connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil, the second secondary coil and the third secondary coil are the same, the winding directions of the first shielding coil and the second shielding coil are the same, and the winding directions of the first shielding coil and the second shielding coil are opposite to the winding directions of the primary coil.
The number of turns of the first secondary coil and the third secondary coil are the same and smaller than the number of turns of the second secondary coil.
The utility model provides a gold inspection machine, includes first drive circuit, transmitting coil and first receiving coil, second receiving coil, gold inspection machine still includes second drive circuit, third drive circuit, first shielding coil and second shielding coil, first receiving coil, transmitting coil, second receiving coil and second shielding coil arrange in proper order, transmitting coil, first shielding coil and second shielding coil correspond respectively and are connected to first drive circuit, second drive circuit and third drive circuit, and the current direction in first shielding coil and the second shielding coil is the same to all opposite with the current direction in the transmitting coil, wherein, the current direction is clockwise or anticlockwise.
The utility model provides a gold inspection machine, includes first drive circuit, transmitting coil and first receiving coil, second receiving coil, gold inspection machine still includes second drive circuit, first shielding coil and second shielding coil, first receiving coil, transmitting coil, second receiving coil and second shielding coil arrange in proper order, transmitting coil is connected to first drive circuit, first shielding coil and second shielding coil are all connected to second drive circuit, and the current direction in first shielding coil and the second shielding coil is the same to all opposite with the current direction in the transmitting coil, wherein, the current direction is clockwise or anticlockwise.
Compared with the prior art, the invention has the following beneficial effects: through having designed two shielding coils, be located two receiving coils respectively outside to two shielding coils's magnetic field direction is opposite with transmitting coil's magnetic field direction, thereby can offset transmitting coil's magnetic field, reduces the metal district, and then is convenient for miniaturized make the overall arrangement of gold inspection machine production line compacter.
Drawings
FIG. 1 is a schematic layout of a coil of the present invention;
FIG. 2 is a schematic diagram of the present invention;
FIG. 3 is a schematic diagram of a gold-detecting assembly according to some embodiments of the present invention;
FIG. 4 is a schematic diagram of a gold-detecting assembly according to other embodiments of the present invention;
FIG. 5 is a schematic diagram of a gold-detecting assembly according to still other embodiments of the present invention;
FIG. 6 is a schematic diagram of a gold-detecting assembly according to some embodiments of the present invention;
wherein: 1. the device comprises a controller 2, a first driving circuit 3, a receiving demodulation circuit 4, a coil group 5, a second driving circuit 6, a third driving circuit 41, a transmitting coil 42, a first receiving coil 43, a second receiving coil 44, a first shielding coil 45 and a second shielding coil.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
The gold inspection machine, as shown in fig. 3, comprises a controller 1, a first driving circuit 2, a receiving demodulation circuit 3, a transmitting coil 41, a first receiving coil 42 and a second receiving coil 43, wherein the controller 1 is respectively connected with the first driving circuit 2 and the receiving demodulation circuit 3, the receiving demodulation circuit 3 is connected with the first receiving coil 42 and the second receiving coil 43, the gold inspection machine further comprises a first shielding coil 44 and a second shielding coil 45, and in the coil group 4, as shown in fig. 1, the first shielding coil 44, the first receiving coil 42, the transmitting coil 41, the second receiving coil 43 and the second shielding coil 45 are sequentially arranged, and the current directions in the first shielding coil 44 and the second shielding coil 45 are the same and are opposite to the current directions in the transmitting coil 41, wherein the current directions are clockwise or anticlockwise.
Through designing two shielding coils, be located two receiving coils respectively outside to the magnetic field direction of two shielding coils is opposite with the magnetic field direction of transmitting coil 41, as shown in fig. 2, shielding coil forms the magnetic field opposite with transmitting magnetic field direction in the periphery, forms the protection, makes the disturbance outside the window unable to interfere with inside magnetic field, thereby can offset transmitting coil 41's magnetic field, reduces the metal district, and then is convenient for miniaturize the overall arrangement that makes the gold inspection machine produce the line compacter.
In some embodiments, as shown in fig. 6, the transmitting coil 41, the first shielding coil 44 and the second shielding coil 45 are all connected to the first driving circuit 2, so that the structure of the gold inspection machine can be simplified, fewer components are used, miniaturization is achieved, and cost is reduced, in one embodiment, the first driving circuit 2 includes a main circuit and a transmitting transformer, the transmitting transformer includes a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the first secondary coil, the second secondary coil and the third secondary coil are connected to the transmitting coil 41, the first secondary coil is connected to the first shielding coil 44, the third secondary coil is connected to the second shielding coil 45, winding directions of the first secondary coil and the third secondary coil are the same, and winding directions of the first shielding coil 44, the primary coil and the second shielding coil 45 are the same. Thus, by selecting different taps of the transmitting transformer, the magnetic field directions of the two shielding coils are opposite to the magnetic field direction of the transmitting coil 41, the structure of the lead-out wire of the original window coil is not damaged, and the reliability is high. Of course, as in the other embodiment, the first driving circuit 2 may include a main circuit and a transmitting transformer, the transmitting transformer includes a primary winding, a first secondary winding, a second secondary winding and a third secondary winding, the first secondary winding, the second secondary winding and the third secondary winding are connected to the transmitting winding 41, the first secondary winding is connected to the first shielding winding 44, the third secondary winding is connected to the second shielding winding 45, and the winding directions of the first secondary winding, the second secondary winding and the third secondary winding are the same, and the winding directions of the first shielding winding 44 and the second shielding winding 45 are the same, and are opposite to those of the primary winding, so that similar effects can be achieved.
In order to achieve the above effect, the number of turns of the first secondary winding and the third secondary winding is the same and smaller than the number of turns of the second secondary winding.
In some embodiments, as shown in fig. 4, the gold inspection machine further includes a second driving circuit 5 and a third driving circuit 6, the transmitting coil 41, the first shielding coil 44 and the second shielding coil 45 are respectively connected to the first driving circuit 2, the second driving circuit 5 and the third driving circuit 6, and the current directions in the first shielding coil 44 and the second shielding coil 45 are the same and opposite to the current direction in the transmitting coil 41, wherein the current direction is clockwise or anticlockwise, and similar shielding effect can be achieved, but material and control cost can be increased, and stability and reliability can be reduced.
In some embodiments, as shown in fig. 5, the gold inspection machine further includes a second driving circuit 5, a first shielding coil 44 and a second shielding coil 45, the transmitting coil 41 is connected to the first driving circuit 2, the first shielding coil 44 and the second shielding coil 45 are connected to the second driving circuit 5, and the current directions in the first shielding coil 44 and the second shielding coil 45 are the same and opposite to the current direction in the transmitting coil 41, wherein the current direction is clockwise or anticlockwise, similar shielding effect can be achieved, but material and control cost can be increased, and stability and reliability can be reduced.
Claims (4)
1. The gold inspection machine comprises a first driving circuit, a transmitting coil, a first receiving coil and a second receiving coil, and is characterized by further comprising a first shielding coil and a second shielding coil, wherein the first shielding coil, the first receiving coil, the transmitting coil, the second receiving coil and the second shielding coil are sequentially arranged, the transmitting coil, the first shielding coil and the second shielding coil are all connected to the first driving circuit, and the current directions in the first shielding coil and the second shielding coil are the same and opposite to the current direction in the transmitting coil, and the current directions are clockwise or anticlockwise;
the first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the second secondary coil is connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil and the third secondary coil are the same, the winding directions of the first secondary coil and the third secondary coil are opposite to the winding directions of the second secondary coil, the winding directions of the first shielding coil, the primary coil and the second shielding coil are the same, and the number of turns of the first secondary coil and the number of turns of the third secondary coil are the same and smaller than the number of turns of the second secondary coil.
2. The gold inspection machine comprises a first driving circuit, a transmitting coil, a first receiving coil and a second receiving coil, and is characterized by further comprising a first shielding coil and a second shielding coil, wherein the first shielding coil, the first receiving coil, the transmitting coil, the second receiving coil and the second shielding coil are sequentially arranged, the transmitting coil, the first shielding coil and the second shielding coil are all connected to the first driving circuit, and the current directions in the first shielding coil and the second shielding coil are the same and opposite to the current direction in the transmitting coil, and the current directions are clockwise or anticlockwise; the first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the second secondary coil is connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil, the second secondary coil and the third secondary coil are the same, and the winding directions of the first shielding coil and the second shielding coil are the same and are opposite to the winding directions of the primary coil; the number of turns of the first secondary coil and the third secondary coil are the same and smaller than the number of turns of the second secondary coil.
3. The gold inspection machine transmitting module is characterized by comprising a first driving circuit, a transmitting coil, a first shielding coil and a second shielding coil, wherein the first shielding coil, the transmitting coil and the second shielding coil are sequentially arranged, the transmitting coil, the first shielding coil and the second shielding coil are connected to the first driving circuit, the current directions in the first shielding coil and the second shielding coil are the same, and are opposite to the current directions in the transmitting coil, and the current directions are clockwise or anticlockwise;
the first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the second secondary coil is connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil and the third secondary coil are the same, the winding directions of the first secondary coil and the third secondary coil are opposite to the winding directions of the second secondary coil, the winding directions of the first shielding coil, the primary coil and the second shielding coil are the same, and the number of turns of the first secondary coil and the number of turns of the third secondary coil are the same and smaller than the number of turns of the second secondary coil.
4. The gold inspection machine transmitting module is characterized by comprising a first driving circuit, a transmitting coil, a first shielding coil and a second shielding coil, wherein the first shielding coil, the transmitting coil and the second shielding coil are sequentially arranged, the transmitting coil, the first shielding coil and the second shielding coil are connected to the first driving circuit, the current directions in the first shielding coil and the second shielding coil are the same, and are opposite to the current directions in the transmitting coil, and the current directions are clockwise or anticlockwise;
the first driving circuit comprises a main circuit and a transmitting transformer, the transmitting transformer comprises a primary coil, a first secondary coil, a second secondary coil and a third secondary coil, the second secondary coil is connected with the transmitting coil, the first secondary coil is connected with the first shielding coil, the third secondary coil is connected with the second shielding coil, the winding directions of the first secondary coil, the second secondary coil and the third secondary coil are the same, the winding directions of the first shielding coil and the second shielding coil are the same, and are opposite to the winding directions of the primary coil, and the number of turns of the first secondary coil and the number of turns of the third secondary coil are the same and are smaller than the number of turns of the second secondary coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633822.5A CN112612062B (en) | 2020-12-31 | 2020-12-31 | Gold inspection machine and gold inspection machine transmitting module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011633822.5A CN112612062B (en) | 2020-12-31 | 2020-12-31 | Gold inspection machine and gold inspection machine transmitting module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112612062A CN112612062A (en) | 2021-04-06 |
| CN112612062B true CN112612062B (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011633822.5A Active CN112612062B (en) | 2020-12-31 | 2020-12-31 | Gold inspection machine and gold inspection machine transmitting module |
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| CN (1) | CN112612062B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991003746A1 (en) * | 1989-09-08 | 1991-03-21 | Atomic Energy Of Canada Limited | Metal detecting system |
| JPH10132949A (en) * | 1996-10-29 | 1998-05-22 | Toshitaka Nakano | Metal detecting method and detecting head for metal detector |
| EP0927890A2 (en) * | 1998-01-05 | 1999-07-07 | Picker International, Inc. | Shielded gradient coil assembly for magnetic resonance imaging system |
| US5952822A (en) * | 1996-10-24 | 1999-09-14 | Allen-Bradley Company, Llc | Method and apparatus for proximity sensing in the presence of an external field |
| CN107884835A (en) * | 2017-12-20 | 2018-04-06 | 福建省麦雅数控科技有限公司 | A kind of highly sensitive SMART METALS detector |
| CN108964296A (en) * | 2017-05-26 | 2018-12-07 | 乐金电子研发中心(上海)有限公司 | Electromagnetic screen and method, the radio energy transmission system of wireless power transmission |
| WO2019057777A1 (en) * | 2017-09-22 | 2019-03-28 | Prodrive Technologies B.V. | Device and method for foreign object detection in wireless energy transfer |
| CN110703339A (en) * | 2019-10-30 | 2020-01-17 | 上海太易检测技术有限公司 | Transmission coil driving circuit and method |
| CN110703341A (en) * | 2019-11-27 | 2020-01-17 | 江苏开创检测技术有限公司 | Metal detection device for food |
-
2020
- 2020-12-31 CN CN202011633822.5A patent/CN112612062B/en active Active
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|---|---|---|---|---|
| WO1991003746A1 (en) * | 1989-09-08 | 1991-03-21 | Atomic Energy Of Canada Limited | Metal detecting system |
| EP0490921A1 (en) * | 1989-09-08 | 1992-06-24 | Ca Atomic Energy Ltd | Metal detecting system. |
| US5952822A (en) * | 1996-10-24 | 1999-09-14 | Allen-Bradley Company, Llc | Method and apparatus for proximity sensing in the presence of an external field |
| JPH10132949A (en) * | 1996-10-29 | 1998-05-22 | Toshitaka Nakano | Metal detecting method and detecting head for metal detector |
| EP0927890A2 (en) * | 1998-01-05 | 1999-07-07 | Picker International, Inc. | Shielded gradient coil assembly for magnetic resonance imaging system |
| CN108964296A (en) * | 2017-05-26 | 2018-12-07 | 乐金电子研发中心(上海)有限公司 | Electromagnetic screen and method, the radio energy transmission system of wireless power transmission |
| WO2019057777A1 (en) * | 2017-09-22 | 2019-03-28 | Prodrive Technologies B.V. | Device and method for foreign object detection in wireless energy transfer |
| CN107884835A (en) * | 2017-12-20 | 2018-04-06 | 福建省麦雅数控科技有限公司 | A kind of highly sensitive SMART METALS detector |
| CN110703339A (en) * | 2019-10-30 | 2020-01-17 | 上海太易检测技术有限公司 | Transmission coil driving circuit and method |
| CN110703341A (en) * | 2019-11-27 | 2020-01-17 | 江苏开创检测技术有限公司 | Metal detection device for food |
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| Title |
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| CN112612062A (en) | 2021-04-06 |
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Address after: Room 1038, 2 / F, self building, No. 555, Dongchuan Road, Minhang District, Shanghai 201108 Patentee after: TECHIK INSTRUMENT (SHANGHAI) Co.,Ltd. Country or region after: Zhong Guo Address before: 200237 Shanghai Xuhui District City Jia Chuan Road No. 245 Building No. 3 room 506 Patentee before: TECHIK INSTRUMENT (SHANGHAI) Co.,Ltd. Country or region before: Zhong Guo |