Pulse magnetic force quantitative control circuit based on electro-permanent magnet

Abstract

The invention discloses a pulse magnetic force quantitative control circuit based on an electro permanent magnet, which comprises a main control unit, a gain unit and a detection unit, and is characterized in that the gain unit is connected with the main control unit and the detection unit, and the main control unit is used for generating a pulse signal and adjusting the pulse width of the signal based on the signal feedback of the detection unit; the detection unit is used for detecting the magnetic flux of the electric permanent magnet and carrying out corresponding feedback based on a detection result, and the gain unit is used for gaining a pulse current signal. When the magnetic domain overturning degree is full overturning, a multi-stage pulse sequence can be formed based on the current magnetic flux of the electro-permanent magnet and a set quantitative standard, and pulse current is increased step by step in the sequence until quantitative magnetizing is completed, so that accurate quantitative control is realized, and energy loss is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric permanent magnet magnetic force control, and in particular to a pulse magnetic force quantitative control circuit based on an electric permanent magnet. Background Art

[0002] The non-volatile property of the electric permanent magnet makes it maintain the current magnetization state after the magnetization is completed, without the need for continuous power supply, so it is widely used in industrial transportation, medical treatment, electronic equipment and other fields. When the permanent magnet is magnetized, the pulse current of the magnetization is increased to ensure the magnetic intensity of the magnetization, and the pulse width of the magnetization is increased to ensure the degree of reversal of the magnetic domain in the permanent magnet. Therefore, the pulse current and pulse width during magnetization are important factors that determine the magnetic flux of the permanent magnet. In order to ensure the magnetic flux of the permanent magnet, the existing technology increases the current and pulse width as much as possible, but it will cause excessive energy loss. Therefore, a pulse magnetic force quantitative control circuit based on the electric permanent magnet is proposed, which can detect and adjust the degree of reversal of the magnetic domain in the permanent magnet, and can form a multi-level pulse sequence based on the current magnetic flux of the permanent magnet and the set quantitative standard when the degree of magnetic domain reversal is fully reversed, and the pulse current is increased step by step in this sequence until the quantitative magnetization is completed, so as to achieve precise quantitative control and reduce energy loss. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to provide a pulse magnetic quantitative control circuit based on an electropermanent magnet, comprising a main control unit, a gain unit, and a detection unit, wherein the gain unit is connected to the main control unit and the detection unit, and is characterized in that the main control unit is used to generate a pulse signal and adjust the pulse width of the pulse signal based on the signal feedback of the detection unit, the detection unit is used to detect the magnetic flux of the electropermanent magnet and provide corresponding feedback based on the detection result, the gain unit is used to gain the pulse current signal, and the main control unit comprises a second operational amplifier, a first diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first connector, and a second connector; The in-phase end of the second operational amplifier, the cathode of the first diode, one end of the eighth resistor, one end of the tenth resistor and the first connector end are connected, the inverting end of the second operational amplifier is connected to one end of the seventh resistor and one end of the ninth resistor, the output end of the second operational amplifier, the anode of the first diode are connected to the second connector end, the other end of the eighth resistor and the other end of the ninth resistor are connected to the power supply, and the other end of the seventh resistor and the other end of the tenth resistor are connected to the ground end.

[0004] Further, the main control unit also includes a third operational amplifier, a fourth operational amplifier, a fifth field effect transistor, a second diode, a first capacitor, a sixth resistor, an eleventh resistor, a twelfth resistor, and a fourteenth resistor; The third operational amplifier in-phase end, the fifth field effect tube gate and the second connector end are connected, the third operational amplifier inverting end is connected to one end of the sixth resistor, the third operational amplifier output end is connected to the other end of the sixth resistor and one end of the fourteenth resistor, the fourth operational amplifier in-phase end is connected to one end of the first capacitor, the fifth field effect tube source, and the other end of the fourteenth resistor, the fourth operational amplifier inverting end is connected to one end of the eleventh resistor and one end of the twelfth resistor, the fourth operational amplifier output end is connected to the anode of the second diode, the cathode of the second diode is connected to one end of the seventh resistor, the other end of the eleventh resistor is connected to the power supply, and the other end of the first capacitor, the drain of the fifth field effect tube, the other end of the twelfth resistor and the ground end are connected.

[0005] Furthermore, the twelfth resistor and the fourteenth resistor are adjustable resistors.

[0006] Furthermore, it also includes an auxiliary control unit, which includes a seventh triode, an eighth field effect transistor, a third diode, a fourth diode, a fifth diode, a third capacitor, a fifth resistor, a sixteenth resistor, an eighteenth resistor, a nineteenth resistor, and a third connector; The emitter of the seventh transistor is connected to one end of the fifth resistor and one end of the sixteenth resistor, the base of the seventh transistor is connected to the cathode of the fourth diode and one end of the nineteenth resistor, the collector of the seventh transistor is connected to the drain of the eighth field effect transistor and one end of the third capacitor, the gate of the eighth field effect transistor is connected to the cathode of the third diode, the source of the eighth field effect transistor is connected to the anode of the fifth diode and one end of the eighteenth resistor, the cathode of the fifth diode is connected to the first connector end, the anode of the third diode, the anode of the fourth diode are connected to the third connector end, the other end of the fifth resistor is connected to the power supply, and the other ends of the sixteenth resistor, the eighteenth resistor, the nineteenth resistor, the other end of the third capacitor are connected to the ground end.

[0007] Furthermore, the auxiliary control unit further includes a first operational amplifier, a sixth field effect transistor, a sixth diode, a first resistor, a fourth resistor, a thirteenth resistor, and a seventeenth resistor; The in-phase end of the first operational amplifier is connected to one end of the fourth resistor and one end of the seventeenth resistor, the inverting end of the first operational amplifier is connected to one end of the first resistor and one end of the first capacitor, the output end of the first operational amplifier is connected to the source of the sixth field effect transistor, the gate of the sixth field effect transistor is connected to the collector of the seventh transistor, the drain of the sixth field effect transistor is connected to the anode of the sixth diode and one end of the thirteenth resistor, the cathode of the sixth diode is connected to the first connector end, the other end of the fourth resistor is connected to the power supply, and the other ends of the first resistor, the other ends of the thirteenth resistor, and the other end of the seventeenth resistor are connected to the ground end.

[0008] Further, the auxiliary control unit also includes a twentieth resistor; One end of the twentieth resistor is connected to the gate of the eighth field effect transistor, and the other end of the twentieth resistor is connected to the ground.

[0009] Furthermore, it also includes a switching unit, the switching unit is connected to the gain unit, and the switching unit includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a second resistor, a fourth connector, a fifth connector, and a sixth connector; The drain of the first field effect transistor, the drain of the second field effect transistor, one end of the second resistor and the fourth connector end are connected, the source of the first field effect transistor, the drain of the third field effect transistor and one end of the coil are connected, the gate of the first field effect transistor, the gate of the fourth field effect transistor and the fifth connector end are connected, the source of the second field effect transistor, the drain of the fourth field effect transistor and the other end of the coil are connected, the gate of the second field effect transistor, the gate of the third field effect transistor and the sixth connector end are connected, and the other end of the second resistor, the source of the third field effect transistor, the source of the fourth field effect transistor and the ground end are connected.

[0010] Furthermore, the switching unit further includes a third resistor and a fifteenth resistor; One end of the third resistor is connected to the gate of the first field effect transistor, one end of the fifteenth resistor is connected to the gate of the second field effect transistor, and the other end of the third resistor and the other end of the fifteenth resistor are connected to the ground end. The beneficial effects of the present invention compared with the prior art are: The present invention can detect and adjust the degree of reversal of magnetic domains in an electropermanent magnet, and can form a multi-level pulse sequence based on the current magnetic flux of the electropermanent magnet and a set quantitative standard when the degree of magnetic domain reversal is sufficient, and increase the pulse current step by step in this sequence until quantitative magnetization is completed, thereby achieving precise quantitative control and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 This is a schematic diagram of the overall structure of the pulse magnetic quantitative control circuit provided by the present invention.

[0013] Figure 2 This is a circuit diagram of the main control unit and auxiliary control unit provided by the present invention.

[0014] Figure 3 This is a schematic diagram of a switching unit circuit provided by the present invention. DETAILED DESCRIPTION

[0015] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0016] The present invention discloses a pulse magnetic force quantitative control circuit based on an electro-permanent magnet, as shown in the attached Figure 1 As shown, it includes a main control unit, a gain unit, and a detection unit. The gain unit is connected to the main control unit and the detection unit. The main control unit is used to generate a pulse signal and adjust the pulse width of the pulse signal based on the signal feedback of the detection unit. The detection unit is used to detect the magnetic flux of the electropermanent magnet and provide corresponding feedback based on the detection result. The gain unit is used to gain the pulse current signal.

[0017] As attached Figure 2 As shown, the main control unit includes a second operational amplifier U2, a first diode D1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first connector P1, and a second connector P2; The in-phase end of the second operational amplifier U2, the cathode of the first diode D1, one end of the eighth resistor R8, one end of the tenth resistor R10 are connected to the first connector P1 end, the inverting end of the second operational amplifier U2 is connected to one end of the seventh resistor R7, one end of the ninth resistor R9, the output end of the second operational amplifier U2, the anode of the first diode D1 are connected to the second connector P2 end, the other end of the eighth resistor R8, the other end of the ninth resistor R9 are connected to the power supply, and the other end of the seventh resistor R7, the other end of the tenth resistor R10 are connected to the ground end.

[0018] As attached Figure 2 As shown, specifically, the main control unit further includes a third operational amplifier U3, a fourth operational amplifier U4, a fifth field effect transistor Q5, a second diode D2, a first capacitor C1, a sixth resistor R6, an eleventh resistor R11, a twelfth resistor R12, and a fourteenth resistor R14; The third operational amplifier U3 in-phase end, the gate of the fifth field effect transistor Q5 and the second connector P2 are connected, the third operational amplifier U3 inverting end and one end of the sixth resistor R6 are connected, the third operational amplifier U3 output end and the other end of the sixth resistor R6 and one end of the fourteenth resistor R14 are connected, the fourth operational amplifier U4 in-phase end and one end of the first capacitor C1, the source of the fifth field effect transistor Q5 and the other end of the fourteenth resistor R14 are connected, the fourth operational amplifier U4 inverting end and one end of the eleventh resistor R11 and one end of the twelfth resistor R12 are connected, the fourth operational amplifier U4 output end is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to one end of the seventh resistor R7, the other end of the eleventh resistor R11 is connected to the power supply, the other end of the first capacitor C1, the drain of the fifth field effect transistor Q5, the other end of the twelfth resistor R12 and the ground are connected. Wherein, the twelfth resistor R12 and the fourteenth resistor R14 are adjustable resistors.

[0019] As attached Figure 2 As shown, specifically, the auxiliary control unit includes a seventh transistor Q7, an eighth field effect transistor Q8, a third diode D3, a fourth diode D4, a fifth diode D5, a third capacitor C3, a fifth resistor R5, a sixteenth resistor R16, an eighteenth resistor R18, a nineteenth resistor R19, and a third connector P3; The emitter of the seventh transistor Q7 is connected to one end of the fifth resistor R5 and one end of the sixteenth resistor R16, the base of the seventh transistor Q7 is connected to the cathode of the fourth diode D4 and one end of the nineteenth resistor R19, the collector of the seventh transistor Q7 is connected to the drain of the eighth field effect transistor Q8 and one end of the third capacitor C3, the gate of the eighth field effect transistor Q8 is connected to the cathode of the third diode D3, the source of the eighth field effect transistor Q8 is connected to the anode of the fifth diode D5 and one end of the eighteenth resistor R18, the cathode of the fifth diode D5 is connected to the end of the first connector P1, the anode of the third diode D3, the anode of the fourth diode D4 are connected to the end of the third connector P3, the other end of the fifth resistor R5 is connected to the power supply, and the other end of the sixteenth resistor R16, the other end of the eighteenth resistor R18, the other end of the nineteenth resistor R19, and the other end of the third capacitor C3 are connected to the ground end.

[0020] As attached Figure 2 As shown, specifically, the auxiliary control unit further includes a first operational amplifier U1, a sixth field effect transistor Q6, a sixth diode D6, a first resistor R1, a fourth resistor R4, a thirteenth resistor R13, and a seventeenth resistor R17; The in-phase end of the first operational amplifier U1 is connected to one end of the fourth resistor R4 and one end of the seventeenth resistor R17, the inverting end of the first operational amplifier U1 is connected to one end of the first resistor R1 and one end of the first capacitor C1, the output end of the first operational amplifier U1 is connected to the source of the sixth field effect transistor Q6, the gate of the sixth field effect transistor Q6 is connected to the collector of the seventh transistor Q7, the drain of the sixth field effect transistor Q6 is connected to the anode of the sixth diode D6 and one end of the thirteenth resistor R13, the cathode of the sixth diode D6 is connected to the end of the first connector P1, the other end of the fourth resistor R4 is connected to the power supply, and the other ends of the first resistor R1, the other ends of the thirteenth resistor R13 and the other end of the seventeenth resistor R17 are connected to the ground.

[0021] As attached Figure 2 As shown, specifically, the auxiliary control unit further includes a twentieth resistor R20; one end of the twentieth resistor R20 is connected to the gate of the eighth field effect transistor Q8, and the other end of the twentieth resistor R20 is connected to the ground.

[0022] As attached Figure 3 As shown, specifically, the switching unit includes a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a fourth field effect transistor Q4, a second resistor R2, a fourth connector P4, a fifth connector P5, and a sixth connector P6; The drain of the first field effect transistor Q1, the drain of the second field effect transistor Q2, one end of the second resistor R2 and the fourth connector P4 are connected, the source of the first field effect transistor Q1, the drain of the third field effect transistor Q3 and one end of the coil are connected, the gate of the first field effect transistor Q1, the gate of the fourth field effect transistor Q4 and the fifth connector P5 are connected, the source of the second field effect transistor Q2, the drain of the fourth field effect transistor Q4 and the other end of the coil are connected, the gate of the second field effect transistor Q2, the gate of the third field effect transistor Q3 and the sixth connector P6 are connected, and the other end of the second resistor R2, the source of the third field effect transistor Q3, the source of the fourth field effect transistor Q4 and the ground are connected.

[0023] As attached Figure 3 As shown, specifically, the switching unit further includes a third resistor R3 and a fifteenth resistor R15; One end of the third resistor R3 is connected to the gate of the first field effect transistor Q1, one end of the fifteenth resistor R15 is connected to the gate of the second field effect transistor Q2, and the other ends of the third resistor R3 and the fifteenth resistor R15 are connected to the ground.

[0024] See attached Figure 2, the first connector P1 is used to obtain the start signal of magnetization / demagnetization. During the initial magnetization / demagnetization, the signal is fed back by the operator. The power signal passes through the ninth resistor R9 and the seventh resistor R7 to the ground terminal. The signal at the seventh resistor R7 end is fed back to the inverting terminal of the second operational amplifier U2. The power signal passes through the eighth resistor R8 and the tenth resistor R10 to the ground terminal. The signal at the tenth resistor R10 end is fed back to the inverting terminal of the second operational amplifier U2. The resistance values ​​of the seventh resistor R7 and the tenth resistor R10 are adjusted so that the signal at the seventh resistor R7 end is higher than the signal at the tenth resistor R10 end in the initial state of the circuit. When the first connector P1 obtains the signal feedback, the potential at the tenth resistor R10 end rises, and the second operational amplifier U2 outputs. The signal at the output end of the second operational amplifier U2 passes through The first diode D1 and the tenth resistor R10 are connected to the ground terminal so that when the first connector P1 loses the signal feedback, the signal at the tenth resistor R10 end is clamped to the signal amplitude after the voltage drop of the first diode D1 at the output end of the second operational amplifier U2, and the second operational amplifier U2 continues to output, and the power supply signal is connected to the ground terminal through the eleventh resistor R11 and the twelfth resistor R12. The signal at the twelfth resistor R12 end is fed back to the inverting terminal of the fourth operational amplifier U4, and the signal at the output end of the second operational amplifier U2 is fed back to the non-inverting terminal of the third operational amplifier U3. The output end of the third operational amplifier U3 is negatively feedback connected to the inverting terminal of the third operational amplifier U3 through the sixth resistor R6, and the third operational amplifier U3 follows and outputs the output end signal of the second operational amplifier U2. The signal at the output end of the amplifier U3 causes the potential of the first capacitor C1 to rise after passing through the fourteenth resistor R14. When the potential of the first capacitor C1 reaches the signal amplitude of the twelfth resistor R12, the fourth operational amplifier U4 outputs, and the signal at the output end of the fourth operational amplifier U4 passes through the second diode D2 and the seventh resistor R7 to the ground terminal. The potential of the seventh resistor R7 rises, and the second operational amplifier U2 is turned off. At this time, the second operational amplifier U2 completes the output of a pulse signal, and the signal at the output end of the second operational amplifier U2 is synchronously fed back to the gate of the fifth field effect tube Q5. When the second operational amplifier U2 is turned off, the voltage difference between the gate of the fifth field effect tube Q5 and the source of the fifth field effect tube Q5 is lower than the conduction threshold, and the fifth field effect tube Q5 is turned on. The signal at the first capacitor C1 passes through the second diode D2 and the seventh resistor R7 to the ground terminal. The potential of the seventh resistor R7 rises, and the second operational amplifier U2 is turned off. The source of the fifth field effect transistor Q5 and the drain of the fifth field effect transistor Q5 are connected to the ground terminal, the potential of the first capacitor C1 decreases, and the fourth operational amplifier U4 is cut off. The potential rising speed of the first capacitor C1 is changed by adjusting the resistance value of the fourteenth resistor R14, and the reference signal amplitude output by the fourth operational amplifier U4 is changed by adjusting the resistance value of the twelfth resistor R12. The pulse width of the pulse signal output by the second operational amplifier U2 is changed by adjusting the resistance values ​​of the twelfth resistor R12 and the fourteenth resistor R14 as needed. The signal at the output end of the second operational amplifier U2 is a charging / demagnetizing operation signal, and the operation signal is fed back to the gain unit through the second connector P2. When the gain unit obtains the signal feedback, it synchronously feeds back the current signal to the coil. At this time, the current signal fed back by the gain unit has no gain.When the gain unit loses the signal feedback from the second connector P2, it stops feeding back the current signal to the coil. After the gain unit feeds back the current signal to the coil once, the detection unit detects the magnetic flux of the electropermanent magnet and records it. After the recording is completed, the resistance value of the twelfth resistor R12 or the fourteenth resistor R14 is adjusted to change the pulse width. After the adjustment is completed, the detection unit feeds back the start signal again through the first connector P1 for magnetization. The detection unit compares the magnetic flux of the two magnetizations to detect the degree of reversal of the magnetic domain in the electropermanent magnet. When the magnetic flux detected twice is consistent, the pulse width of the pulse signal output by the second operational amplifier U2 at this time can make the degree of reversal of the magnetic domain of the electropermanent magnet fully reversed. In this way, when the main control unit obtains the start signal, the degree of reversal of the magnetic domain in the electropermanent magnet is detected and adjusted. ,

[0025] See attached Figure 2The quantitative standard of magnetic flux is set on the detection unit. When the magnetic domain reversal degree of the electropermanent magnet is fully reversed and the magnetic flux does not reach the quantitative standard, the detection unit feeds back an adjustment signal to the gain unit. When the gain unit obtains the signal feedback, it adjusts the gain multiple of the current signal. The single adjustment amount is set on the gain unit. At the same time, the detection unit feeds back a quantitative calibration signal to the auxiliary control unit through the third connector P3. In the initial state of the circuit, the power supply signal passes through the fifth resistor R5 and the sixteenth resistor R16 to the ground terminal. The signal at the end of the sixteenth resistor R16 passes through the emitter of the seventh transistor Q7, the base of the seventh transistor Q7, and the nineteenth resistor R19 to the ground terminal. The seventh transistor Q7 is turned on, and the third capacitor C3 obtains the initial potential. When the third connector P3 obtains the signal feedback When the signal of the third connector P3 reaches the ground terminal through the fourth diode D4 and the nineteenth resistor R19, the seventh transistor Q7 is cut off, and at the same time, the signal of the third connector P3 is fed back to the gate of the eighth field effect transistor Q8 through the third diode D3, the twentieth resistor R20 is used to discharge the parasitic capacitance of the gate of the eighth field effect transistor Q8, the voltage difference between the gate of the eighth field effect transistor Q8 and the source of the eighth field effect transistor Q8 is higher than the turn-on threshold, the eighth field effect transistor Q8 is turned on, the signal at the end of the third capacitor C3 reaches the ground terminal through the eighteenth resistor R18, the signal at the end of the eighteenth resistor R18 is fed back to the in-phase terminal of the second operational amplifier U2 through the fifth diode D5, the potential of the third capacitor C3 decreases, and the second operational amplifier U2 outputs a pulse signal again to make the gain unit feedback the current gain of the coil Pulse signal, when the coil obtains the signal feedback and the electro-permanent magnet does not reach the quantitative standard, the power supply signal passes through the fourth resistor R4 and the seventeenth resistor R17 to the ground terminal, the signal at the seventeenth resistor R17 end is fed back to the first operational amplifier U1 in-phase terminal, and the signal at the first capacitor C1 end is synchronously fed back to the first operational amplifier U1 inverting terminal, the signal amplitude at the seventeenth resistor R17 end is the reference response amplitude, and the response amplitude is changed by adjusting the resistance of the seventeenth resistor R17. The signal amplitude is lower than the conduction threshold between the gate of the fifth field effect transistor Q5 and the source of the fifth field effect transistor Q5. When the second operational amplifier U2 outputs the potential of the first capacitor C1 to rise to the signal amplitude at the twelfth resistor R12 end, the fourth operational amplifier U4 outputs, and the second operational amplifier U2 is cut off. The fifth field effect tube Q5 is turned on, and the potential of the first capacitor C1 quickly reaches the conduction threshold between the gate of the fifth field effect tube Q5 and the source of the fifth field effect tube Q5, and then the fifth field effect tube Q5 is turned off, and the potential of the first capacitor C1 terminal is connected to the ground terminal through the first resistor R1, and the resistance value of the first resistor R1 is adjusted to change the potential drop speed of the first capacitor C1 at this time. The higher the resistance value of the first resistor R1, the longer the response time. When the potential of the first capacitor C1 terminal reaches the signal amplitude of the seventeenth resistor R17 terminal, the first operational amplifier U1 outputs, and the signal at the output terminal of the first operational amplifier U1 is connected to the ground terminal through the source of the sixth field effect tube Q6, the drain of the sixth field effect tube Q6, and the thirteenth resistor R13. The signal at the thirteenth resistor R13 terminal is connected to the ground terminal through the sixth diode D6 and the tenth resistor R10.The signal at the end of the tenth resistor R10 rises, and the second operational amplifier U2 outputs again. After the fifth field effect tube Q5 is turned off, the time from the potential at the end of the first capacitor C1 to the signal amplitude at the end of the seventeenth resistor R17 is the response period of the detection unit, which is used for the detection unit to detect the magnetic flux of the electropermanent magnet again and feedback the response time of the corresponding signal based on the detection result when the coil obtains the current signal after gain. When the detection unit detects that the magnetic flux of the electropermanent magnet does not meet the quantitative standard during the response period, the detection unit feeds back an adjustment signal to the gain unit again, and the gain unit increases the gain multiple of the current signal again. After the response period, the second operational amplifier U 2 Feedback a pulse signal again to make the gain unit feed back the current signal to the coil again and then enter the response period. When the detection unit detects that the magnetic flux of the electropermanent magnet reaches the quantitative standard during the response period, the detection unit stops feeding back the quantitative calibration signal to the auxiliary control unit, the eighth field effect tube Q8 is turned off, the seventh transistor Q7 is turned on, the third capacitor C3 rises to the initial potential, and the auxiliary control unit is reset. In this way, when the magnetic domain reversal degree is fully reversed, a multi-level pulse sequence is formed based on the current magnetic flux of the electropermanent magnet and the set quantitative standard. In this sequence, the pulse current is increased step by step until the quantitative magnetization is completed, so as to achieve precise quantitative control and reduce energy loss. ,

[0026] See attached Figure 3, the current signal fed back by the gain unit is fed back to the switching unit, the fourth connector P4 is used to receive the signal, the signal at the fourth connector P4 end is connected to the ground end through the second resistor R2, the fifth connector P5 / sixth connector P6 is used to receive the channel switching signal of magnetization / demagnetization, the signal at the fifth connector P5 end is fed back to the gate of the first field effect transistor Q1 and the gate of the fourth field effect transistor Q4, the third resistor R3 is used to discharge the parasitic capacitance of the gate of the first field effect transistor Q1 and the gate of the fourth field effect transistor Q4, when the fifth connector P5 obtains the signal feedback, the voltage difference between the gate of the first field effect transistor Q1 and the source of the first field effect transistor Q1 is higher than the conduction threshold, the first field effect transistor Q1 is turned on, the fourth field effect transistor Q4 is turned on, and the signal at the second resistor R2 end is connected to the ground end through the drain of the first field effect transistor Q1, the source of the first field effect transistor Q1, the coil, the drain of the fourth field effect transistor Q4, and the source of the fourth field effect transistor Q4. , the signal at the sixth connector P6 end is fed back to the gate of the second field effect transistor Q2 and the gate of the third field effect transistor Q3, the fifteenth resistor R15 is used to discharge the parasitic capacitance of the gate of the second field effect transistor Q2 and the gate of the third field effect transistor Q3, when the sixth connector P6 obtains signal feedback, the voltage difference between the gate of the second field effect transistor Q2 and the source of the third field effect transistor Q3 is higher than the conduction threshold, the second field effect transistor Q2 is turned on, and the third field effect transistor Q3 is turned on, and the signal at the second resistor R2 end is connected to the ground terminal through the drain of the second field effect transistor Q2, the source of the second field effect transistor Q2, the coil, the drain of the third field effect transistor Q3, and the source of the third field effect transistor Q3, and the pulse polarity is changed through the signal feedback of the fifth connector P5 / sixth connector P6 to adjust the current direction of magnetization / demagnetization, the switching signal is fed back by the manual / terminal, and when the demagnetization channel is turned on, the detection unit stops the signal feedback to the auxiliary control unit and the gain unit.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A pulse magnetic quantitative control circuit based on an electropermanent magnet, comprising a main control unit, a gain unit, and a detection unit, wherein the gain unit is connected to the main control unit and the detection unit, and is characterized in that: The main control unit is used to generate a pulse signal and adjust the pulse width of the pulse signal based on the signal feedback of the detection unit, the detection unit is used to detect the magnetic flux of the electropermanent magnet and provide corresponding feedback based on the detection result, the gain unit is used to gain the pulse current signal, and the main control unit includes a second operational amplifier, a first diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first connector, and a second connector; The in-phase end of the second operational amplifier, the cathode of the first diode, one end of the eighth resistor, one end of the tenth resistor and the first connector end are connected, the inverting end of the second operational amplifier is connected to one end of the seventh resistor and one end of the ninth resistor, the output end of the second operational amplifier, the anode of the first diode are connected to the second connector end, the other end of the eighth resistor and the other end of the ninth resistor are connected to the power supply, and the other end of the seventh resistor and the other end of the tenth resistor are connected to the ground end.

2. The pulse magnetic force quantitative control circuit based on the electropermanent magnet according to claim 1 is characterized in that: The main control unit further includes a third operational amplifier, a fourth operational amplifier, a fifth field effect transistor, a second diode, a first capacitor, a sixth resistor, an eleventh resistor, a twelfth resistor, and a fourteenth resistor; The third operational amplifier in-phase end, the fifth field effect tube gate and the second connector end are connected, the third operational amplifier inverting end is connected to one end of the sixth resistor, the third operational amplifier output end is connected to the other end of the sixth resistor and one end of the fourteenth resistor, the fourth operational amplifier in-phase end is connected to one end of the first capacitor, the fifth field effect tube source, and the other end of the fourteenth resistor, the fourth operational amplifier inverting end is connected to one end of the eleventh resistor and one end of the twelfth resistor, the fourth operational amplifier output end is connected to the anode of the second diode, the cathode of the second diode is connected to one end of the seventh resistor, the other end of the eleventh resistor is connected to the power supply, and the other end of the first capacitor, the drain of the fifth field effect tube, the other end of the twelfth resistor and the ground end are connected.

3. The pulse magnetic force quantitative control circuit based on the electropermanent magnet according to claim 2 is characterized in that: The twelfth resistor and the fourteenth resistor are adjustable resistors.

4. The pulse magnetic force quantitative control circuit based on the electropermanent magnet according to claim 1 is characterized in that: It also includes an auxiliary control unit, which includes a seventh triode, an eighth field effect transistor, a third diode, a fourth diode, a fifth diode, a third capacitor, a fifth resistor, a sixteenth resistor, an eighteenth resistor, a nineteenth resistor, and a third connector; The emitter of the seventh transistor is connected to one end of the fifth resistor and one end of the sixteenth resistor, the base of the seventh transistor is connected to the cathode of the fourth diode and one end of the nineteenth resistor, the collector of the seventh transistor is connected to the drain of the eighth field effect transistor and one end of the third capacitor, the gate of the eighth field effect transistor is connected to the cathode of the third diode, the source of the eighth field effect transistor is connected to the anode of the fifth diode and one end of the eighteenth resistor, the cathode of the fifth diode is connected to the first connector end, the anode of the third diode, the anode of the fourth diode are connected to the third connector end, the other end of the fifth resistor is connected to the power supply, and the other ends of the sixteenth resistor, the eighteenth resistor, the nineteenth resistor, the other end of the third capacitor are connected to the ground end.

5. The pulse magnetic force quantitative control circuit based on the electropermanent magnet according to claim 4 is characterized in that: The auxiliary control unit further includes a first operational amplifier, a sixth field effect transistor, a sixth diode, a first resistor, a fourth resistor, a thirteenth resistor, and a seventeenth resistor; The in-phase end of the first operational amplifier is connected to one end of the fourth resistor and one end of the seventeenth resistor, the inverting end of the first operational amplifier is connected to one end of the first resistor and one end of the first capacitor, the output end of the first operational amplifier is connected to the source of the sixth field effect transistor, the gate of the sixth field effect transistor is connected to the collector of the seventh transistor, the drain of the sixth field effect transistor is connected to the anode of the sixth diode and one end of the thirteenth resistor, the cathode of the sixth diode is connected to the first connector end, the other end of the fourth resistor is connected to the power supply, and the other ends of the first resistor, the other ends of the thirteenth resistor, and the other end of the seventeenth resistor are connected to the ground end.

6. The pulse magnetic force quantitative control circuit based on the electropermanent magnet according to claim 4, characterized in that: The auxiliary control unit also includes a twentieth resistor; One end of the twentieth resistor is connected to the gate of the eighth field effect transistor, and the other end of the twentieth resistor is connected to the ground.

7. The pulse magnetic force quantitative control circuit based on the electropermanent magnet according to claim 1 is characterized in that: It also includes a switching unit, which is connected to the gain unit, and the switching unit includes a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a second resistor, a fourth connector, a fifth connector, and a sixth connector; The drain of the first field effect transistor, the drain of the second field effect transistor, one end of the second resistor and the fourth connector end are connected, the source of the first field effect transistor, the drain of the third field effect transistor and one end of the coil are connected, the gate of the first field effect transistor, the gate of the fourth field effect transistor and the fifth connector end are connected, the source of the second field effect transistor, the drain of the fourth field effect transistor and the other end of the coil are connected, the gate of the second field effect transistor, the gate of the third field effect transistor and the sixth connector end are connected, and the other end of the second resistor, the source of the third field effect transistor, the source of the fourth field effect transistor and the ground end are connected.

8. The pulse magnetic force quantitative control circuit based on the electropermanent magnet according to claim 7, characterized in that: The switching unit further includes a third resistor and a fifteenth resistor; One end of the third resistor is connected to the gate of the first field effect transistor, one end of the fifteenth resistor is connected to the gate of the second field effect transistor, and the other ends of the third resistor and the fifteenth resistor are connected to the ground.

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