CN112782619A - Magnetic field direction quick switching device suitable for Helmholtz coil - Google Patents
Magnetic field direction quick switching device suitable for Helmholtz coil Download PDFInfo
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- CN112782619A CN112782619A CN202110132147.6A CN202110132147A CN112782619A CN 112782619 A CN112782619 A CN 112782619A CN 202110132147 A CN202110132147 A CN 202110132147A CN 112782619 A CN112782619 A CN 112782619A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
Abstract
The invention relates to a magnetic field direction switching technology, in particular to a magnetic field direction quick switching device suitable for a Helmholtz coil. The invention solves the problems of low switching speed and poor operation safety of the existing magnetic field direction switching technology. A magnetic field direction fast switching device suitable for a Helmholtz coil comprises a main body part and a control part; the main body part comprises a rectangular substrate, first to fourth insulating strips, first to sixth conductive strips, first to eighth field effect transistors and first to sixteenth conductive strips; the control part comprises a first BNC connector, an isolating circuit, a fifth resistor, a switching circuit, a second BNC connector, a fifth BNC connector, a first capacitor, a second capacitor and a three-terminal voltage stabilizer. The invention is suitable for switching the magnetic field direction.
Description
Technical Field
The invention relates to a magnetic field direction switching technology, in particular to a magnetic field direction quick switching device suitable for a Helmholtz coil.
Background
The Helmholtz coil is a device for manufacturing a uniform magnetic field in a small-range area, and is widely applied to the fields of materials, manufacturing, medical treatment, engineering, aerospace, precision measurement and the like. In many applications, it is often desirable to switch the direction of the magnetic field generated by the Helmholtz coil. In this regard, it is common that the positive and negative poles of the dc excitation power supply are connected in reverse by a manual operation, so that the direction of the current flowing through the helmholtz coil is changed, thereby switching the direction of the magnetic field generated by the helmholtz coil. The magnetic field direction switching technology is limited by the principle of the technology, and has the following problems: first, during manual operation, the dc excitation power source must be turned off, resulting in a slow switching speed. Secondly, because the electric current in the Helmholtz coil is big current usually, lead to there being the electric shock hidden danger among the manual operation process, lead to operating safety poor from this. Therefore, it is necessary to provide a device for rapidly switching the magnetic field direction of a helmholtz coil to solve the problems of slow switching speed and poor operation safety of the conventional magnetic field direction switching technology.
Disclosure of Invention
The invention provides a magnetic field direction quick switching device suitable for a Helmholtz coil, aiming at solving the problems of low switching speed and poor operation safety of the existing magnetic field direction switching technology.
The invention is realized by adopting the following technical scheme:
a magnetic field direction fast switching device suitable for a Helmholtz coil comprises a main body part and a control part;
the main body part comprises a rectangular substrate, first to fourth insulating strips, first to sixth conductive strips, first to eighth field effect transistors and first to sixteenth conductive strips;
the first to fourth insulating strips are transversely attached to the upper plate surface of the rectangular substrate and are arranged in parallel; the left ends of the first to fourth insulating strips are all flush with the left edge of the rectangular substrate; the right ends of the first to fourth insulating strips are all flush with the right edge of the rectangular substrate; the upper plate surfaces of the first to fourth insulating battens are respectively provided with a left and right through sinking groove along the transverse direction;
the first conductive strip plate is attached in the sinking groove on the first insulating strip plate along the transverse direction, and the left end of the first conductive strip plate exceeds the left end of the first insulating strip plate; the second conductive strip plate is attached in the sinking groove on the first insulating strip plate along the transverse direction, and the right end of the second conductive strip plate exceeds the right end of the first insulating strip plate; an insulation distance is reserved between the right end of the first conductive strip plate and the left end of the second conductive strip plate; the third conductive strip plate is attached in the sinking groove on the second insulating strip plate along the transverse direction; the left end of the third conductive strip plate exceeds the left end of the second insulating strip plate; the right end of the third conductive strip plate is flush with the right end of the second insulating strip plate; the fourth conductive strip plate is attached in the sinking groove on the third insulating strip plate along the transverse direction; the left end of the fourth conductive strip plate exceeds the left end of the third insulating strip plate; the right end of the fourth conductive strip plate is flush with the right end of the third insulating strip plate; the fifth conductive strip plate is attached in the sinking groove on the fourth insulating strip plate along the transverse direction, and the left end of the fifth conductive strip plate exceeds the left end of the fourth insulating strip plate; the sixth conductive strip plate is attached in the sinking groove on the fourth insulating strip plate along the transverse direction, and the right end of the sixth conductive strip plate exceeds the right end of the fourth insulating strip plate; an insulation distance is reserved between the right end of the fifth conductive strip plate and the left end of the sixth conductive strip plate;
the first field effect tube, the second field effect tube, the third field effect tube, the fourth field effect tube and the fourth field effect tube are fixed on the upper plate surface of the rectangular substrate from left to right, and the first field effect tube, the second field effect tube, the third field effect tube, the fourth field effect tube and the fourth field effect tube are all positioned between the first insulating strip plate and the second insulating strip; the fifth field effect tube, the fourth field effect tube, the fifth field effect tube, the sixth field effect tube;
two ends of the first conductive strip are respectively connected with the first conductive strip plate and the drain electrode of the first field effect transistor; two ends of the second conductive strip are respectively connected with the first conductive strip plate and the drain electrode of the second field effect transistor; two ends of the third conductive strip are respectively connected with the second conductive strip plate and the source electrode of the third field effect transistor; two ends of the fourth conducting strip are respectively connected with the second conducting strip plate and the source electrode of the fourth field effect transistor; two ends of the fifth conductive strip are respectively connected with the source electrode of the first field effect transistor and the third conductive strip plate; two ends of the sixth conductive strip are respectively connected with the source electrode of the second field effect transistor and the third conductive strip plate; two ends of the seventh conductive strip are respectively connected with the drain electrode of the third field effect transistor and the third conductive strip plate; two ends of the eighth conductive strip are respectively connected with the drain electrode of the fourth field effect transistor and the third conductive strip plate; two ends of the ninth conductive strip are respectively connected with the fourth conductive strip plate and the source electrode of the fifth field effect transistor; two ends of the tenth conducting strip are respectively connected with the fourth conducting strip plate and the source electrode of the sixth field effect transistor; two ends of the eleventh conducting strip are respectively connected with the fourth conducting strip plate and the drain electrode of the seventh field effect tube; two ends of the twelfth conducting strip are respectively connected with the fourth conducting strip plate and the drain electrode of the eighth field effect transistor; two ends of the thirteenth conducting strip are respectively connected with the drain electrode of the fifth field effect transistor and the fifth conducting strip plate; two ends of the fourteenth conducting strip are respectively connected with the drain electrode of the sixth field effect transistor and the fifth conducting strip plate; two ends of the fifteenth conducting strip are respectively connected with the source electrode of the seventh field effect transistor and the sixth conducting strip plate; two ends of the sixteenth conductive strip are respectively connected with the source electrode of the eighth field effect transistor and the sixth conductive strip plate;
the control part comprises a first BNC joint, an isolation circuit, a fifth resistor, a switching circuit, second to fifth BNC joints, a first capacitor, a second capacitor and a three-terminal voltage stabilizer;
the isolation circuit comprises first to fourth resistors and an amplifier;
the switch circuit comprises sixth to thirteenth resistors and first to fourth analog switch chips;
the positive electrode of the first BNC joint is connected with the positive input end of the amplifier through a first resistor; one end of the second resistor is grounded, and the other end of the second resistor is connected with the positive input end of the amplifier; the negative electrode of the first BNC joint is connected with the negative input end of the amplifier through a third resistor; one end of the fourth resistor is grounded, and the other end of the fourth resistor is connected with the negative input end of the amplifier;
the positive power supply end of the amplifier is connected with a +15V power supply end; the negative power supply end of the amplifier is connected with a-15V power supply end; the output end of the amplifier is respectively connected with the input ends of the first to fourth analog switch chips through a fifth resistor;
the grounding end of the first analog switch chip is grounded through a sixth resistor; the normally open end of the first analog switch chip is connected with a +15V power supply end; the normally closed end of the first analog switch chip is grounded; the positive power supply end of the first analog switch chip is connected with the +15V power supply end; the negative power supply end of the first analog switch chip is connected with a-15V power supply end; the output end of the first analog switch chip is connected with the anode of the second BNC connector; the anode of the second BNC joint is respectively connected with the grid of the first field-effect tube and the grid of the second field-effect tube; the negative electrode of the second BNC joint is grounded through a seventh resistor on one hand, and is respectively connected with the source electrode of the first field-effect tube and the source electrode of the second field-effect tube on the other hand;
the grounding end of the second analog switch chip is grounded through an eighth resistor; the normally open end of the second analog switch chip is connected with the +15V power supply end; the normally closed end of the second analog switch chip is grounded; the positive power supply end of the second analog switch chip is connected with the +15V power supply end; the negative power supply end of the second analog switch chip is connected with a-15V power supply end; the output end of the second analog switch chip is connected with the anode of the third BNC connector; the anode of the third BNC joint is respectively connected with the grid of the seventh field-effect tube and the grid of the eighth field-effect tube; the negative electrode of the third BNC joint is grounded through a ninth resistor on one hand, and is respectively connected with the source electrode of the seventh field-effect tube and the source electrode of the eighth field-effect tube on the other hand;
the grounding end of the third analog switch chip is grounded through a tenth resistor; the normally open end of the third analog switch chip is grounded; the normally closed end of the third analog switch chip is connected with the +15V power supply end; the positive power supply end of the third analog switch chip is connected with the +15V power supply end; the negative power supply end of the third analog switch chip is connected with a-15V power supply end; the output end of the third analog switch chip is connected with the anode of the fourth BNC connector; the positive electrode of the fourth BNC joint is respectively connected with the grid electrode of the fifth field-effect tube and the grid electrode of the sixth field-effect tube; the negative electrode of the fourth BNC joint is grounded through an eleventh resistor on one hand, and is respectively connected with the source electrode of the fifth field-effect tube and the source electrode of the sixth field-effect tube on the other hand;
the grounding end of the fourth analog switch chip is grounded through a twelfth resistor; the normally open end of the fourth analog switch chip is grounded; the normally closed end of the fourth analog switch chip is connected with the +15V power supply end; the positive power supply end of the fourth analog switch chip is connected with the +15V power supply end; the negative power supply end of the fourth analog switch chip is connected with a-15V power supply end; the output end of the fourth analog switch chip is connected with the anode of the fifth BNC connector; the anode of the fifth BNC joint is respectively connected with the grid of the third field-effect tube and the grid of the fourth field-effect tube; the negative electrode of the fifth BNC joint is grounded through a thirteenth resistor on one hand, and is respectively connected with the source electrode of the third field-effect tube and the source electrode of the fourth field-effect tube on the other hand;
the input end of the three-terminal voltage stabilizer is connected with a +15V power supply end; the output end of the three-terminal voltage stabilizer is respectively connected with the reference voltage ends of the first to fourth analog switch chips; the common end of the three-terminal voltage stabilizer is grounded; one end of the first capacitor is grounded, and the other end of the first capacitor is connected with the input end of the three-terminal voltage regulator; one end of the second capacitor is grounded, and the other end of the second capacitor is connected with the output end of the three-terminal voltage stabilizer.
A water cooling channel is formed inside the rectangular substrate; the two ends of the water-cooling channel are communicated with the right end face of the rectangular substrate, and the two ends of the water-cooling channel are respectively provided with a water-cooling interface.
The rectangular substrate is made of aluminum; the first to fourth insulating strips are made of epoxy resin; the first to sixth conductive strips and the first to sixteenth conductive strips are made of red copper.
The amplifier is an INA114 type amplifier; the first analog switch chip, the second analog switch chip, the third analog switch chip and the fourth analog switch chip are all MAX319 type analog switch chips; the three-terminal regulator is an LM7805 type three-terminal regulator.
When the electromagnetic switch works, the left end of the first conductive strip plate and the left end of the fifth conductive strip plate are both connected with the anode of a direct-current excitation power supply. The right end of the second conductive strip plate and the right end of the sixth conductive strip plate are both connected with the negative electrode of the direct-current excitation power supply. The left end of the third conductive strip plate and the left end of the fourth conductive strip plate are respectively connected with two ends of the Helmholtz coil. The first BNC connector is connected with the output end of the signal generator. And a control signal output by the signal generator is transmitted to the switch circuit through the first BNC connector, the isolating circuit and the fifth resistor in sequence.
The specific working process is as follows: firstly, when the control signal is in a high level: the normally-open end of the first analog switch chip is connected with the output end, so that the output end of the first analog switch chip is at a high level, and the first field effect transistor and the second field effect transistor are both switched on. The normally-open end of the second analog switch chip is connected with the output end, so that the output end of the second analog switch chip is at a high level, and the seventh field effect transistor and the eighth field effect transistor are both switched on. The normally-open end of the third analog switch chip is connected with the output end, so that the output end of the third analog switch chip is at a low level, and the fifth field effect transistor and the sixth field effect transistor are both cut off. The normally-open end of the fourth analog switch chip is connected with the output end, so that the output end of the fourth analog switch chip is at a low level, and the third field effect transistor and the fourth field effect transistor are both cut off. At this time, the current flows from the positive electrode of the dc excitation power supply, sequentially through the first conductive strip, the first conductive strip (the second conductive strip), the first field effect transistor (the second field effect transistor), the fifth conductive strip (the sixth conductive strip), the third conductive strip, the helmholtz coil, the fourth conductive strip, the eleventh conductive strip (the twelfth conductive strip), the seventh field effect transistor (the eighth field effect transistor), the fifteenth conductive strip (the sixteenth conductive strip), and the sixth conductive strip, and then returns to the negative electrode of the dc excitation power supply, so that the helmholtz coil generates the forward magnetic field. Secondly, when the control signal is at low level: the normally-closed end of the first analog switch chip is connected with the output end, so that the output end of the first analog switch chip is at a low level, and the first field effect transistor and the second field effect transistor are both cut off. And the normally-closed end of the second analog switch chip is connected with the output end, so that the output end of the second analog switch chip is at a low level, and the seventh field effect transistor and the eighth field effect transistor are both cut off. And the normally-closed end of the third analog switch chip is connected with the output end, so that the output end of the third analog switch chip is at a high level, and the fifth field effect transistor and the sixth field effect transistor are both switched on. And the normally-closed end of the fourth analog switch chip is connected with the output end, so that the output end of the fourth analog switch chip is at a high level, and the third field effect transistor and the fourth field effect transistor are both switched on. At this time, the current flows from the positive electrode of the dc excitation power supply, sequentially through the fifth conductive strip, the thirteenth conductive strip (the fourteenth conductive strip), the fifth field effect transistor (the sixth field effect transistor), the ninth conductive strip (the tenth conductive strip), the fourth conductive strip, the helmholtz coil, the third conductive strip, the seventh conductive strip (the eighth conductive strip), the third field effect transistor (the fourth field effect transistor), the third conductive strip (the fourth conductive strip), and the second conductive strip, and then returns to the negative electrode of the dc excitation power supply, so that the helmholtz coil generates the reverse magnetic field. Therefore, the current direction in the Helmholtz coil can be quickly changed only by changing the level of the control signal, so that the direction of the magnetic field generated by the Helmholtz coil is quickly switched. In the process, cooling water flows through the first water-cooling interface, the water-cooling channel and the second water-cooling interface in sequence, so that the first to eighth field effect transistors are cooled.
Based on the above process, compared with the existing magnetic field direction switching technology, the magnetic field direction fast switching device for the helmholtz coil, disclosed by the invention, realizes fast switching of the magnetic field direction generated by the helmholtz coil on the premise of not switching off the direct-current excitation power supply based on a brand new principle, and therefore has the following advantages: firstly, the direction of the magnetic field generated by the Helmholtz coil can be switched without switching off the direct-current excitation power supply, so that the switching speed is obviously improved. Secondly, the manual operation process is omitted, so that the electric shock hidden danger is eliminated, and the operation safety is obviously improved.
The magnetic field direction switching device is reasonable in structure and ingenious in design, effectively solves the problems of low switching speed and poor operation safety of the existing magnetic field direction switching technology, and is suitable for magnetic field direction switching.
Drawings
Fig. 1 is a schematic view of the structure of the main body part in the present invention.
Fig. 2 is a schematic circuit diagram of a control section in the present invention.
In the figure: 1-rectangular substrate, 201-first insulating strip, 202-second insulating strip, 203-third insulating strip, 204-fourth insulating strip, 301-first conductive strip, 302-second conductive strip, 303-third conductive strip, 304-fourth conductive strip, 305-fifth conductive strip, 306-sixth conductive strip, 401-first fet, 402-second fet, 403-third fet, 404-fourth fet, 405-fifth fet, 406-sixth fet, 407-seventh fet, 408-eighth fet, 501-first conductive strip, 502-second conductive strip, 503-third conductive strip, 504-fourth conductive strip, 505-fifth conductive strip, 506-sixth conductive strip, 507-seventh conductive strip, 508-eighth conductive strip, 509-ninth conductive strip, 510-tenth conductive strip, 511-eleventh conductive strip, 512-twelfth conductive strip, 513-thirteenth conductive strip, 514-fourteenth conductive strip, 515-fifteenth conductive strip, 516-sixteenth conductive strip, and 6-water cooling interface.
Detailed Description
A magnetic field direction fast switching device suitable for a Helmholtz coil comprises a main body part and a control part;
the main body part comprises a rectangular substrate 1, first to fourth insulating strips 201 to 204, first to sixth conductive strips 301 to 306, first to eighth field effect transistors 401 to 408, and first to sixteenth conductive strips 501 to 516;
the first to fourth insulating strips 201 to 204 are transversely attached to the upper plate surface of the rectangular substrate 1, and the first to fourth insulating strips 201 to 204 are arranged in parallel; the left ends of the first to fourth insulating strips 201-204 are all flush with the left edge of the rectangular substrate 1; the right ends of the first to fourth insulating strips 201-204 are all flush with the right edge of the rectangular substrate 1; the upper plate surfaces of the first to fourth insulating strips 201-204 are respectively provided with a through sinking groove along the transverse direction;
the first conductive strip board 301 is attached in the sinking groove on the first insulating strip board 201 along the transverse direction, and the left end of the first conductive strip board 301 exceeds the left end of the first insulating strip board 201; the second conductive strip plate 302 is attached in the sinking groove on the first insulating strip plate 201 along the transverse direction, and the right end of the second conductive strip plate 302 exceeds the right end of the first insulating strip plate 201; an insulation distance is reserved between the right end of the first conductive strip plate 301 and the left end of the second conductive strip plate 302; the third conductive strip 303 is attached to the sinking groove of the second insulating strip 202 along the transverse direction; the left end of the third conductive strip 303 exceeds the left end of the second insulating strip 202; the right end of the third conductive strip 303 is flush with the right end of the second insulating strip 202; the fourth conductive strip 304 is attached in the sinking groove of the third insulating strip 203 along the transverse direction; the left end of the fourth conductive strip 304 exceeds the left end of the third insulating strip 203; the right end of the fourth conductive strip plate 304 is flush with the right end of the third insulating strip plate 203; the fifth conductive strip 305 is attached to the sinking groove of the fourth insulating strip 204 along the transverse direction, and the left end of the fifth conductive strip 305 exceeds the left end of the fourth insulating strip 204; the sixth conductive strip 306 is attached to the sunken groove of the fourth insulating strip 204 along the transverse direction, and the right end of the sixth conductive strip 306 exceeds the right end of the fourth insulating strip 204; an insulation distance is left between the right end of the fifth conductive strip 305 and the left end of the sixth conductive strip 306;
the first to fourth field effect transistors 401 to 404 are fixed on the upper plate surface of the rectangular substrate 1 from left to right, and the first to fourth field effect transistors 401 to 404 are all located between the first insulating strip plate 201 and the second insulating strip plate 202; the fifth to eighth field effect transistors 405 to 408 are fixed on the upper plate surface of the rectangular substrate 1 from left to right, and the fifth to eighth field effect transistors 405 to 408 are all located between the third insulating strip plate 203 and the fourth insulating strip plate 204;
two ends of the first conductive strip 501 are respectively connected with the first conductive strip 301 and the drain of the first field effect transistor 401; two ends of the second conductive strip 502 are respectively connected with the drains of the first conductive strip 301 and the second field effect transistor 402; two ends of the third conductive strip 503 are respectively connected with the sources of the second conductive strip 302 and the third field effect transistor 403; two ends of the fourth conductive strip 504 are respectively connected with the sources of the second conductive strip 302 and the fourth field effect transistor 404; two ends of the fifth conductive strip 505 are respectively connected with the source of the first field effect transistor 401 and the third conductive strip 303; two ends of the sixth conductive strip 506 are respectively connected with the source of the second field effect transistor 402 and the third conductive strip 303; two ends of the seventh conductive strip 507 are respectively connected with the drain of the third field effect transistor 403 and the third conductive strip 303; both ends of the eighth conductive strip 508 are respectively connected to the drain of the fourth fet 404 and the third conductive strip 303; two ends of the ninth conductive strip 509 are respectively connected with the sources of the fourth conductive strip 304 and the fifth field effect transistor 405; two ends of the tenth conductive strip 510 are respectively connected to the sources of the fourth conductive strip 304 and the sixth fet 406; both ends of the eleventh conductive strip 511 are respectively connected with the drains of the fourth conductive strip 304 and the seventh field effect transistor 407; two ends of the twelfth conducting strip 512 are respectively connected with the drains of the fourth conducting strip 304 and the eighth fet 408; both ends of the thirteenth conductive strip 513 are respectively connected with the drain of the fifth field effect transistor 405 and the fifth conductive strip 305; the two ends of the fourteenth conducting strip 514 are respectively connected with the drain of the sixth fet 406 and the fifth conducting strip 305; two ends of the fifteenth conductive strip 515 are respectively connected to the source of the seventh fet 407 and the sixth conductive strip 306; both ends of the sixteenth conductive strip 516 are respectively connected to the source of the eighth fet 408 and the sixth conductive strip 306;
the control part comprises a first BNC joint J1, an isolation circuit, a fifth resistor R5, a switching circuit, second to fifth BNC joints J2-J5, a first capacitor C1, a second capacitor C2 and a three-terminal regulator H;
the isolation circuit comprises first to fourth resistors R1-R4 and an amplifier U;
the switch circuit comprises sixth to thirteenth resistors R6 to R13 and first to fourth analog switch chips T1 to T4;
the positive electrode of the first BNC joint J1 is connected with the positive input end of the amplifier U through a first resistor R1; one end of the second resistor R2 is grounded, and the other end is connected with the positive input end of the amplifier U; the negative electrode of the first BNC joint J1 is connected with the negative input end of the amplifier U through a third resistor R3; one end of the fourth resistor R4 is grounded, and the other end of the fourth resistor R4 is connected with the negative input end of the amplifier U;
the positive power supply end of the amplifier U is connected with a +15V power supply end; the negative power supply end of the amplifier U is connected with a-15V power supply end; the output end of the amplifier U is respectively connected with the input ends of the first to fourth analog switch chips T1-T4 through a fifth resistor R5;
the grounding end of the first analog switch chip T1 is grounded through a sixth resistor R6; the normally open end of the first analog switch chip T1 is connected with the +15V power supply end; the normally closed end of the first analog switch chip T1 is grounded; the positive power supply end of the first analog switch chip T1 is connected with the +15V power supply end; the negative power supply end of the first analog switch chip T1 is connected with a-15V power supply end; the output end of the first analog switch chip T1 is connected with the anode of the second BNC connector J2; the anode of the second BNC connector J2 is connected to the gate of the first fet 401 and the gate of the second fet 402 respectively; the negative electrode of the second BNC connector J2 is grounded through a seventh resistor R7, and is connected to the source of the first fet 401 and the source of the second fet 402;
the grounding end of the second analog switch chip T2 is grounded through an eighth resistor R8; the normally open end of the second analog switch chip T2 is connected with the +15V power supply end; the normally closed end of the second analog switch chip T2 is grounded; the positive power supply end of the second analog switch chip T2 is connected with the +15V power supply end; the negative power supply end of the second analog switch chip T2 is connected with a-15V power supply end; the output end of the second analog switch chip T2 is connected with the anode of a third BNC connector J3; the anode of the third BNC connector J3 is connected to the gate of the seventh fet 407 and the gate of the eighth fet 408, respectively; the negative electrode of the third BNC connector J3 is grounded through a ninth resistor R9, and is connected to the source of the seventh fet 407 and the source of the eighth fet 408, respectively;
the ground terminal of the third analog switch chip T3 is grounded through a tenth resistor R10; the normally open end of the third analog switch chip T3 is grounded; the normally closed end of the third analog switch chip T3 is connected with the +15V power supply end; the positive power supply end of the third analog switch chip T3 is connected with the +15V power supply end; the negative power supply end of the third analog switch chip T3 is connected with a-15V power supply end; the output end of the third analog switch chip T3 is connected with the positive electrode of a fourth BNC connector J4; the positive electrode of the fourth BNC connector J4 is connected to the gate of the fifth fet 405 and the gate of the sixth fet 406, respectively; the negative electrode of the fourth BNC connector J4 is grounded through an eleventh resistor R11, and is connected to the source of the fifth fet 405 and the source of the sixth fet 406;
the grounding end of the fourth analog switch chip T4 is grounded through a twelfth resistor R12; the normally open end of the fourth analog switch chip T4 is grounded; the normally closed end of the fourth analog switch chip T4 is connected with the +15V power supply end; the positive power supply end of the fourth analog switch chip T4 is connected with the +15V power supply end; the negative power supply end of the fourth analog switch chip T4 is connected with a-15V power supply end; the output end of the fourth analog switch chip T4 is connected with the anode of a fifth BNC connector J5; the positive electrode of the fifth BNC connector J5 is connected to the gate of the third fet 403 and the gate of the fourth fet 404, respectively; the negative electrode of the fifth BNC connector J5 is grounded through a thirteenth resistor R13, and is connected to the source of the third fet 403 and the source of the fourth fet 404, respectively;
the input end of the three-terminal regulator H is connected with a +15V power supply end; the output end of the three-terminal voltage stabilizer H is respectively connected with the reference voltage ends of the first to fourth analog switch chips T1-T4; the common end of the three-terminal regulator H is grounded; one end of the first capacitor C1 is grounded, and the other end of the first capacitor C1 is connected with the input end of the three-terminal regulator H; one end of the second capacitor C2 is grounded, and the other end is connected with the output end of the three-terminal regulator H.
A water cooling channel is arranged inside the rectangular substrate 1; the two ends of the water-cooling channel penetrate through the right end face of the rectangular substrate 1, and the two ends of the water-cooling channel are respectively provided with a water-cooling interface 6.
The rectangular substrate 1 is made of aluminum; the first to fourth insulating strips 201-204 are made of epoxy resin; the first to sixth conductive strips 301 to 306 and the first to sixteenth conductive strips 501 to 516 are made of red copper.
The amplifier U is an INA114 type amplifier; the first to fourth analog switch chips T1-T4 are MAX319 type analog switch chips; the three-terminal regulator H is an LM7805 type three-terminal regulator.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are 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 (4)
1. The utility model provides a magnetic field direction quick switching device suitable for helmholtz coil which characterized in that: comprises a main body part and a control part;
the main body part comprises a rectangular substrate (1), first to fourth insulating strips (201 to 204), first to sixth conductive strips (301 to 306), first to eighth field effect transistors (401 to 408), and first to sixteenth conductive strips (501 to 516);
the first to fourth insulating strips (201 to 204) are transversely attached to the upper plate surface of the rectangular substrate (1), and the first to fourth insulating strips (201 to 204) are arranged in parallel; the left ends of the first to fourth insulating strips (201-204) are all flush with the left edge of the rectangular substrate (1); the right ends of the first to fourth insulating strips (201-204) are all flush with the right edge of the rectangular substrate (1); the upper plate surfaces of the first to fourth insulating battens (201-204) are respectively provided with a through sinking groove along the transverse direction;
the first conductive strip plate (301) is attached to the sinking groove on the first insulating strip plate (201) along the transverse direction, and the left end of the first conductive strip plate (301) exceeds the left end of the first insulating strip plate (201); the second conductive strip plate (302) is attached in the sinking groove on the first insulating strip plate (201) along the transverse direction, and the right end of the second conductive strip plate (302) exceeds the right end of the first insulating strip plate (201); an insulation distance is reserved between the right end of the first conductive strip plate (301) and the left end of the second conductive strip plate (302); the third conductive strip plate (303) is attached in the sinking groove on the second insulating strip plate (202) along the transverse direction; the left end of the third conductive strip plate (303) exceeds the left end of the second insulating strip plate (202); the right end of the third conductive strip plate (303) is flush with the right end of the second insulating strip plate (202); the fourth conductive strip plate (304) is attached in the sinking groove on the third insulating strip plate (203) along the transverse direction; the left end of the fourth conductive strip plate (304) exceeds the left end of the third insulating strip plate (203); the right end of the fourth conductive strip plate (304) is flush with the right end of the third insulating strip plate (203); the fifth conductive strip (305) is attached in the sinking groove on the fourth insulating strip (204) along the transverse direction, and the left end of the fifth conductive strip (305) exceeds the left end of the fourth insulating strip (204); the sixth conductive strip (306) is attached to the sinking groove of the fourth insulating strip (204) along the transverse direction, and the right end of the sixth conductive strip (306) exceeds the right end of the fourth insulating strip (204); an insulation distance is reserved between the right end of the fifth conductive strip plate (305) and the left end of the sixth conductive strip plate (306);
the first to fourth field effect transistors (401-404) are fixed on the upper plate surface of the rectangular substrate (1) from left to right, and the first to fourth field effect transistors (401-404) are located between the first insulating strip plate (201) and the second insulating strip plate (202); the fifth to eighth field effect transistors (405 to 408) are fixed on the upper plate surface of the rectangular substrate (1) from left to right, and the fifth to eighth field effect transistors (405 to 408) are all positioned between the third insulating strip plate (203) and the fourth insulating strip plate (204);
two ends of the first conductive strip (501) are respectively connected with the drain electrodes of the first conductive strip plate (301) and the first field effect tube (401); two ends of the second conductive strip (502) are respectively connected with the drains of the first conductive strip plate (301) and the second field effect tube (402); two ends of the third conductive strip (503) are respectively connected with the sources of the second conductive strip plate (302) and the third field effect transistor (403); two ends of the fourth conductive strip (504) are respectively connected with the sources of the second conductive strip plate (302) and the fourth field effect tube (404); two ends of the fifth conductive strip (505) are respectively connected with the source electrode of the first field effect transistor (401) and the third conductive strip plate (303); two ends of the sixth conductive strip (506) are respectively connected with the source electrode of the second field effect transistor (402) and the third conductive strip plate (303); two ends of the seventh conductive strip (507) are respectively connected with the drain electrode of the third field effect transistor (403) and the third conductive strip plate (303); two ends of the eighth conductive strip (508) are respectively connected with the drain electrode of the fourth field effect transistor (404) and the third conductive strip plate (303); two ends of the ninth conductive strip (509) are respectively connected with the source electrodes of the fourth conductive strip plate (304) and the fifth field effect transistor (405); two ends of the tenth conductive strip (510) are respectively connected with the sources of the fourth conductive strip plate (304) and the sixth field effect transistor (406); two ends of the eleventh conductive strip (511) are respectively connected with the drains of the fourth conductive strip plate (304) and the seventh field effect tube (407); two ends of the twelfth conducting strip (512) are respectively connected with the drains of the fourth conducting strip plate (304) and the eighth field effect tube (408); two ends of the thirteenth conducting strip (513) are respectively connected with the drain electrode of the fifth field effect transistor (405) and the fifth conducting strip plate (305); two ends of the fourteenth conducting strip (514) are respectively connected with the drain electrode of the sixth field effect transistor (406) and the fifth conducting strip plate (305); two ends of the fifteenth conductive strip (515) are respectively connected with the source electrode of the seventh field effect transistor (407) and the sixth conductive strip plate (306); two ends of the sixteenth conductive strip (516) are respectively connected with the source electrode of the eighth field effect transistor (408) and the sixth conductive strip plate (306);
the control part comprises a first BNC connector (J1), an isolation circuit, a fifth resistor (R5), a switching circuit, second to fifth BNC connectors (J2 to J5), a first capacitor (C1), a second capacitor (C2) and a three-terminal regulator (H);
the isolation circuit comprises first to fourth resistors (R1-R4) and an amplifier (U);
the switch circuit comprises sixth to thirteenth resistors (R6 to R13) and first to fourth analog switch chips (T1 to T4);
the positive electrode of the first BNC joint (J1) is connected with the positive input end of the amplifier (U) through a first resistor (R1); one end of the second resistor (R2) is grounded, and the other end of the second resistor (R2) is connected with the positive input end of the amplifier (U); the negative pole of the first BNC connector (J1) is connected with the negative input end of the amplifier (U) through a third resistor (R3); one end of the fourth resistor (R4) is grounded, and the other end of the fourth resistor (R4) is connected with the negative input end of the amplifier (U);
the positive power supply end of the amplifier (U) is connected with the +15V power supply end; the negative power supply end of the amplifier (U) is connected with a-15V power supply end; the output end of the amplifier (U) is respectively connected with the input ends of the first to fourth analog switch chips (T1-T4) through a fifth resistor (R5);
the grounding end of the first analog switch chip (T1) is grounded through a sixth resistor (R6); the normally open end of the first analog switch chip (T1) is connected with the +15V power supply end; the normally closed end of the first analog switch chip (T1) is grounded; the positive power supply end of the first analog switch chip (T1) is connected with the +15V power supply end; the negative power supply end of the first analog switch chip (T1) is connected with a-15V power supply end; the output end of the first analog switch chip (T1) is connected with the positive electrode of the second BNC connector (J2); the positive electrode of the second BNC joint (J2) is respectively connected with the grid electrode of the first field-effect tube (401) and the grid electrode of the second field-effect tube (402); the negative electrode of the second BNC connector (J2) is grounded through a seventh resistor (R7) on one hand, and is respectively connected with the source electrode of the first field-effect tube (401) and the source electrode of the second field-effect tube (402) on the other hand;
the grounding end of the second analog switch chip (T2) is grounded through an eighth resistor (R8); the normally open end of the second analog switch chip (T2) is connected with the +15V power supply end; the normally closed end of the second analog switch chip (T2) is grounded; the positive power supply end of the second analog switch chip (T2) is connected with the +15V power supply end; the negative power supply end of the second analog switch chip (T2) is connected with a-15V power supply end; the output end of the second analog switch chip (T2) is connected with the positive electrode of the third BNC connector (J3); the positive electrode of the third BNC joint (J3) is respectively connected with the grid electrode of the seventh field effect tube (407) and the grid electrode of the eighth field effect tube (408); the negative electrode of the third BNC connector (J3) is grounded through a ninth resistor (R9) on one hand, and is respectively connected with the source electrode of the seventh field-effect tube (407) and the source electrode of the eighth field-effect tube (408) on the other hand;
the grounding end of the third analog switch chip (T3) is grounded through a tenth resistor (R10); the normally open end of the third analog switch chip (T3) is grounded; the normally closed end of the third analog switch chip (T3) is connected with the +15V power supply end; the positive power supply end of the third analog switch chip (T3) is connected with the +15V power supply end; the negative power supply end of the third analog switch chip (T3) is connected with a-15V power supply end; the output end of the third analog switch chip (T3) is connected with the positive electrode of a fourth BNC connector (J4); the positive electrode of the fourth BNC joint (J4) is respectively connected with the grid electrode of the fifth field-effect tube (405) and the grid electrode of the sixth field-effect tube (406); the negative electrode of the fourth BNC connector (J4) is grounded through an eleventh resistor (R11) on one hand, and is respectively connected with the source electrode of the fifth field-effect tube (405) and the source electrode of the sixth field-effect tube (406) on the other hand;
the grounding end of the fourth analog switch chip (T4) is grounded through a twelfth resistor (R12); the normally open end of the fourth analog switch chip (T4) is grounded; the normally closed end of the fourth analog switch chip (T4) is connected with the +15V power supply end; the positive power supply end of the fourth analog switch chip (T4) is connected with the +15V power supply end; the negative power supply end of the fourth analog switch chip (T4) is connected with the-15V power supply end; the output end of the fourth analog switch chip (T4) is connected with the positive electrode of the fifth BNC connector (J5); the positive electrode of the fifth BNC joint (J5) is respectively connected with the grid electrode of the third field-effect tube (403) and the grid electrode of the fourth field-effect tube (404); the negative electrode of the fifth BNC connector (J5) is grounded through a thirteenth resistor (R13) on one hand, and is respectively connected with the source electrode of the third field-effect tube (403) and the source electrode of the fourth field-effect tube (404) on the other hand;
the input end of the three-terminal regulator (H) is connected with a +15V power supply end; the output end of the three-terminal voltage stabilizer (H) is respectively connected with the reference voltage ends of the first to fourth analog switch chips (T1-T4); the common end of the three-terminal voltage stabilizer (H) is grounded; one end of the first capacitor (C1) is grounded, and the other end of the first capacitor is connected with the input end of the three-terminal regulator (H); one end of the second capacitor (C2) is grounded, and the other end of the second capacitor is connected with the output end of the three-terminal regulator (H).
2. The device of claim 1, wherein the magnetic field direction switching device comprises: a water cooling channel is arranged inside the rectangular substrate (1); two ends of the water-cooling channel penetrate through the right end face of the rectangular substrate (1), and two ends of the water-cooling channel are respectively provided with a water-cooling interface (6).
3. The device of claim 1, wherein the magnetic field direction switching device comprises: the rectangular substrate (1) is made of aluminum; the first to fourth insulating strips (201-204) are all made of epoxy resin; the first to sixth conductive strips (301-306) and the first to sixteenth conductive strips (501-516) are made of red copper.
4. The device of claim 1, wherein the magnetic field direction switching device comprises: the amplifier (U) is an INA114 type amplifier; the first to fourth analog switch chips (T1-T4) are MAX319 type analog switch chips; the three-terminal regulator (H) is an LM7805 type three-terminal regulator.
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