A Pulse Magnetic Force Quantitative Control Circuit Based on an Electromagnetic Permanent Magnet

Abstract

The present invention discloses a pulse magnetic force quantitative control circuit based on an electro-permanent magnet, which 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 signal based on the signal feedback of the detection unit. The detection unit is used to detect the magnetic flux of the electro-permanent magnet and make corresponding feedback based on the detection result. The gain unit is used to amplify the pulse current signal. The present invention can detect and adjust the degree of full flipping of magnetic domains in the electro-permanent magnet, and can form a multi-level pulse sequence based on the current magnetic flux of the electro-permanent magnet and the set quantitative standard when the degree of magnetic domain flipping is full flipping, and gradually increase the pulse current in this sequence until the quantitative magnetization is completed, realizing precise quantitative control and reducing energy loss.

Description

Technical Field

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

[0002] Due to the non-volatile characteristic of the electro-permanent magnet, after magnetization ends, the electro-permanent magnet will maintain its current magnetization state without continuous power supply. Therefore, it is widely used in industrial transportation, medical treatment, electronic equipment and other fields. When the permanent magnet is magnetized, the pulsed current for magnetization is increased to ensure the magnetic intensity of magnetization, and the pulse width of magnetization is increased to ensure the degree of magnetic domain flipping in the permanent magnet. Therefore, the pulsed current and its pulse width during magnetization are important factors determining the magnetic flux of the permanent magnet. In the existing technology, in order to ensure the magnetic flux of the permanent magnet, the current and pulse width are increased as much as possible, but this will cause excessive energy loss. Therefore, a pulse magnetic force quantitative control circuit based on an electro-permanent magnet is proposed, which can detect and adjust the degree of full flipping of the magnetic domains in the permanent magnet, 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 flipping is full flipping, and gradually increase the pulsed current in this sequence until quantitative magnetization is completed, realizing precise quantitative control and reducing energy loss. Summary of the Invention

[0003] Aiming at the above technical problems, the purpose of the present invention is to provide a pulse magnetic force quantitative control circuit based on an electro-permanent magnet, including 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 electro-permanent magnet and give corresponding feedback based on the detection result. The gain unit is used to amplify the pulsed current signal. 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;

[0004] The non-inverting input terminal 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 terminal are connected. The inverting input terminal of the second operational amplifier is connected to one end of the seventh resistor and one end of the ninth resistor. The output terminal of the second operational amplifier, the anode of the first diode, and the second connector terminal are connected. The other end of the eighth resistor and the other end of the ninth resistor are connected to the power supply. The other end of the seventh resistor and the other end of the tenth resistor are connected to the ground terminal.

[0005] Furthermore, 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;

[0006] The non-inverting input terminal of the third operational amplifier, the gate of the fifth field-effect transistor, and the second connector terminal are connected. The inverting input terminal of the third operational amplifier is connected to one end of the sixth resistor. The output terminal of the third operational amplifier is connected to the other end of the sixth resistor and one end of the fourteenth resistor. The non-inverting input terminal of the fourth operational amplifier is connected to one end of the first capacitor, the source of the fifth field-effect transistor, and the other end of the fourteenth resistor. The inverting input terminal of the fourth operational amplifier is connected to one end of the eleventh resistor and one end of the twelfth resistor. The output terminal of the fourth operational amplifier 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. The other end of the first capacitor, the drain of the fifth field-effect transistor, and the other end of the twelfth resistor are connected to the ground terminal.

[0007] Further, the twelfth resistor and the fourteenth resistor are adjustable resistors.

[0008] Further, it further includes an auxiliary control unit, and the auxiliary control unit 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;

[0009] The emitter of the seventh triode is connected to one end of the fifth resistor and one end of the sixteenth resistor. The base of the seventh triode is connected to the cathode of the fourth diode and one end of the nineteenth resistor. The collector of the seventh triode 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 terminal. The anode of the third diode and the anode of the fourth diode are connected to the third connector terminal. The other end of the fifth resistor is connected to the power supply. The other end of the sixteenth resistor, the other end of the eighteenth resistor, the other end of the nineteenth resistor, and the other end of the third capacitor are connected to the ground terminal.

[0010] Further, 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;

[0011] The non-inverting input terminal of the first operational amplifier is connected to one end of the fourth resistor and one end of the seventeenth resistor. The inverting input terminal of the first operational amplifier is connected to one end of the first resistor and one end of the first capacitor. The output terminal 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 triode. 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 terminal. The other end of the fourth resistor is connected to the power supply. The other end of the first resistor, the other end of the thirteenth resistor, and the other end of the seventeenth resistor are connected to the ground terminal.

[0012] Further, the auxiliary control unit further includes a twentieth resistor;

[0013] 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 terminal.

[0014] Furthermore, it further includes a switching unit. The switching unit is connected to the gain unit. 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;

[0015] 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 terminal 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 terminal 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 terminal are connected. 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 terminal are connected.

[0016] Furthermore, the switching unit further includes a third resistor and a fifteenth resistor;

[0017] 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. The other end of the third resistor and the other end of the fifteenth resistor are connected to the ground terminal

[0018] The beneficial effects of the present invention compared with the prior art are:

[0019] The present invention can detect and adjust the sufficient degree of the flip of the magnetic domains in the electro-permanent magnet. When the degree of magnetic domain flip is sufficient flip, a multi-level pulse sequence can be formed based on the current magnetic flux of the electro-permanent magnet and the set quantitative standard, and the pulse current is gradually increased in this sequence until the quantitative magnetization is completed, realizing precise quantitative control and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the prior art and the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the pulse magnetic force quantitative control circuit provided by the present invention.

[0022] Figure 2 It is a schematic diagram of the main control unit and the auxiliary control unit circuit provided by the present invention.

[0023] Figure 3Schematic diagram of the switching unit circuit provided by the present invention. Detailed implementation manners

[0024] In order to make the objectives and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0025] The present invention discloses a pulse magnetic force quantitative control circuit based on an electro-permanent magnet. As shown in the appendix Figure 1 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 electro-permanent magnet and make corresponding feedback based on the detection result. The gain unit is used to amplify the pulse current signal.

[0026] As shown in the appendix Figure 2 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.

[0027] The non-inverting input terminal 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, and the terminal of the first connector P1 are connected. The inverting input terminal of the second operational amplifier U2 and one end of the seventh resistor R7 and one end of the ninth resistor R9 are connected. The output terminal of the second operational amplifier U2, the anode of the first diode D1, and the terminal of the second connector P2 are connected. The other end of the eighth resistor R8, the other end of the ninth resistor R9 are connected to the power supply. The other end of the seventh resistor R7, the other end of the tenth resistor R10 are connected to the ground terminal.

[0028] As shown in the appendix Figure 2 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, a fourteenth resistor R14.

[0029] The non-inverting input terminal of the third operational amplifier U3, the gate of the fifth field effect transistor Q5, and the terminal of the second connector P2 are connected. The inverting input terminal of the third operational amplifier U3 is connected to one end of the sixth resistor R6. The output terminal of the third operational amplifier U3 is connected to the other end of the sixth resistor R6 and one end of the fourteenth resistor R14. The non-inverting input terminal of the fourth operational amplifier U4 is connected to 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. The inverting input terminal of the fourth operational amplifier U4 is connected to one end of the eleventh resistor R11 and one end of the twelfth resistor R12. The output terminal of the fourth operational amplifier U4 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, and the other ends of the twelfth resistor R12 are connected to the ground terminal. Among them, the twelfth resistor R12 and the fourteenth resistor R14 are adjustable resistors.

[0030] As shown in the Figure 2 appendix, specifically, the auxiliary control unit includes a seventh triode 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;

[0031] The emitter of the seventh triode Q7 is connected to one end of the fifth resistor R5 and one end of the sixteenth resistor R16. The base of the seventh triode Q7 is connected to the cathode of the fourth diode D4 and one end of the nineteenth resistor R19. The collector of the seventh triode 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 terminal of the first connector P1. The anode of the third diode D3, the anode of the fourth diode D4, and the terminal of the third connector P3 are connected. The other end of the fifth resistor R5 is connected to the power supply. The other ends of the sixteenth resistor R16, the eighteenth resistor R18, the nineteenth resistor R19, and the third capacitor C3 are connected to the ground terminal.

[0032] As shown in the Figure 2 appendix, 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;

[0033] The non-inverting input terminal 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 input terminal 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 terminal of the first operational amplifier U1 is connected to the source electrode of the sixth field-effect transistor Q6. The gate electrode of the sixth field-effect transistor Q6 is connected to the collector electrode of the seventh triode Q7. The drain electrode 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 terminal of the first connector P1. The other end of the fourth resistor R4 is connected to the power supply. The other ends of the first resistor R1, the thirteenth resistor R13, and the seventeenth resistor R17 are connected to the ground terminal.

[0034] As shown in the attached Figure 2 figure, specifically, the auxiliary control unit further includes a twentieth resistor R20; one end of the twentieth resistor R20 is connected to the gate electrode of the eighth field-effect transistor Q8, and the other end of the twentieth resistor R20 is connected to the ground terminal.

[0035] As shown in the attached Figure 3 figure, 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;

[0036] The drain electrode of the first field-effect transistor Q1, the drain electrode of the second field-effect transistor Q2, and one end of the second resistor R2 are connected to the terminal of the fourth connector P4. The source electrode of the first field-effect transistor Q1, the drain electrode of the third field-effect transistor Q3, and one end of the coil are connected. The gate electrode of the first field-effect transistor Q1, the gate electrode of the fourth field-effect transistor Q4, and the terminal of the fifth connector P5 are connected. The source electrode of the second field-effect transistor Q2, the drain electrode of the fourth field-effect transistor Q4, and the other end of the coil are connected. The gate electrode of the second field-effect transistor Q2, the gate electrode of the third field-effect transistor Q3, and the terminal of the sixth connector P6 are connected. The other end of the second resistor R2, the source electrode of the third field-effect transistor Q3, and the source electrode of the fourth field-effect transistor Q4 are connected to the ground terminal.

[0037] As shown in the attached Figure 3 figure, specifically, the switching unit further includes a third resistor R3 and a fifteenth resistor R15;

[0038] One end of the third resistor R3 is connected to the gate electrode of the first field-effect transistor Q1. One end of the fifteenth resistor R15 is connected to the gate electrode of the second field-effect transistor Q2. The other ends of the third resistor R3 and the fifteenth resistor R15 are connected to the ground terminal.

[0039] Refer to the attached Figure 2, the first connector P1 is used to obtain the enabling signal for magnetization / demagnetization. During initial magnetization / demagnetization, this signal is fed back by the operator. The power signal passes through the ninth resistor R9, the seventh resistor R7 to the ground terminal. The signal at the seventh resistor R7 terminal is fed back to the inverting input terminal of the second operational amplifier U2. The power signal passes through the eighth resistor R8, the tenth resistor R10 to the ground terminal. The signal at the tenth resistor R10 terminal is fed back to the non-inverting input terminal of the second operational amplifier U2. Adjust the resistance values of the seventh resistor R7 and the tenth resistor R10 so that in the initial state, the signal at the seventh resistor R7 terminal is higher than the signal at the tenth resistor R10 terminal. When the first connector P1 obtains the signal feedback, the potential at the tenth resistor R10 terminal rises, and the second operational amplifier U2 outputs. The signal at the output terminal of the second operational amplifier U2 passes through the first diode D1, the tenth resistor R10 to the ground terminal, causing the signal at the tenth resistor R10 terminal to be clamped at the signal amplitude after the voltage drop of the first diode D1 at the output terminal of the second operational amplifier U2 when the first connector P1 loses this signal feedback. The second operational amplifier U2 continues to output. The power signal passes through the eleventh resistor R11, the twelfth resistor R12 to the ground terminal. The signal at the twelfth resistor R12 terminal is fed back to the inverting input terminal of the fourth operational amplifier U4. The signal at the output terminal of the second operational amplifier U2 is fed back to the non-inverting input terminal of the third operational amplifier U3. The output terminal of the third operational amplifier U3 is connected in negative feedback to the inverting input terminal of the third operational amplifier U3 through the sixth resistor R6. The third operational amplifier U3 follows and outputs the signal at the output terminal of the second operational amplifier U2. The signal at the output terminal of the third operational amplifier U3 causes the potential of the first capacitor C1 to rise after passing through the fourteenth resistor R14. When the potential at the first capacitor C1 terminal reaches the signal amplitude at the twelfth resistor R12 terminal, the fourth operational amplifier U4 outputs. The signal at the output terminal of the fourth operational amplifier U4 passes through the second diode D2, the seventh resistor R7 to the ground terminal. The potential at the seventh resistor R7 terminal rises, and the second operational amplifier U2 cuts off. At this time, the second operational amplifier U2 completes the output of a pulse signal. The signal at the output terminal of the second operational amplifier U2 is synchronously fed back to the gate of the fifth field-effect transistor Q5. When the second operational amplifier U2 cuts off, the voltage difference between the gate and the source of the fifth field-effect transistor Q5 is lower than the conduction threshold, and the fifth field-effect transistor Q5 conducts. The signal at the first capacitor C1 terminal passes through the source, drain of the fifth field-effect transistor Q5 to the ground terminal, and the potential at the first capacitor C1 terminal drops. The fourth operational amplifier U4 cuts off. By adjusting the resistance value of the fourteenth resistor R14, the rising speed of the potential of the first capacitor C1 is changed. By adjusting the resistance value of the twelfth resistor R12, the amplitude of the reference signal for the output of the fourth operational amplifier U4 is changed. Adjust the resistance values of the twelfth resistor R12 and the fourteenth resistor R14 as needed to change the pulse width of the pulse signal output by the second operational amplifier U2. The signal at the output terminal of the second operational amplifier U2 is the operation signal for magnetization / demagnetization. The operation signal is fed back to the gain unit through the second connector P2. When the gain unit obtains this signal feedback, it synchronously feeds back the coil feedback current signal. At this time, the current signal fed back by the gain unit has no gain.When the gain unit loses the signal feedback of the second connector P2, stop the coil feedback current signal. After the gain unit feeds back the primary current signal of the coil once, the detection unit detects and records the magnetic flux of the electro-permanent magnet. After the recording is completed, increase the resistance value of the twelfth resistor R12 or the fourteenth resistor R14 to change the pulse width. After the increase is completed, the detection unit feeds back the start signal again through the first connector P1 for magnetization. The detection unit compares the magnetic fluxes of the two magnetizations to detect the degree of full flip of the magnetic domains in the electro-permanent magnet. When the magnetic fluxes detected twice are the same, it means that the pulse signal pulse width output by the second operational amplifier U2 at this time can make the magnetic domains of the electro-permanent magnet flip to the full flip degree. In this way, when the main control unit obtains the start signal, the detection and adjustment of the full flip degree of the magnetic domains in the electro-permanent magnet are carried out.

[0040] Refer to the appendix Figure 2, a quantitative standard of magnetic flux is set on the detection unit. When the degree of magnetic domain flipping of the electro-permanent magnet is full flipping 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 this 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 goes through the fifth resistor R5 and the sixteenth resistor R16 to the ground terminal. The signal at the sixteenth resistor R16 terminal goes through the emitter of the seventh triode Q7, the base of the seventh triode Q7, and the nineteenth resistor R19 to the ground terminal. The seventh triode Q7 conducts, and the third capacitor C3 terminal obtains an initial potential. When the third connector P3 obtains signal feedback, the signal of the third connector P3 goes through the fourth diode D4 and the nineteenth resistor R19 to the ground terminal. The seventh triode Q7 cuts off. 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 and the source of the eighth field-effect transistor Q8 is higher than the conduction threshold, and the eighth field-effect transistor Q8 conducts. The signal at the third capacitor C3 terminal goes through the eighteenth resistor R18 to the ground terminal. The signal at the eighteenth resistor R18 terminal is fed back to the non-inverting input terminal of the second operational amplifier U2 through the fifth diode D5. The potential of the third capacitor C3 drops, and the second operational amplifier U2 outputs a pulse signal again to make the gain unit the pulse signal after the coil feedback current is amplified. When the coil obtains this signal feedback and the electro-permanent magnet does not reach the quantitative standard, the power supply signal goes through the fourth resistor R4 and the seventeenth resistor R17 to the ground terminal. The signal at the seventeenth resistor R17 terminal is fed back to the non-inverting input terminal of the first operational amplifier U1. At the same time, the signal at the first capacitor C1 terminal is synchronously fed back to the inverting input terminal of the first operational amplifier U1. The amplitude of the signal at the seventeenth resistor R17 terminal is the reference response amplitude. Adjusting the resistance value of the seventeenth resistor R17 changes this response amplitude. This signal amplitude is lower than the conduction threshold between the gate and the source of the fifth field-effect transistor Q5. When the output of the second operational amplifier U2 makes the potential of the first capacitor C1 rise to the amplitude of the signal at the twelfth resistor R12 terminal, the fourth operational amplifier U4 outputs, and the second operational amplifier U2 cuts off. The fifth field-effect transistor Q5 conducts. After the potential of the first capacitor C1 quickly reaches the conduction threshold between the gate and the source of the fifth field-effect transistor Q5, the fifth field-effect transistor Q5 cuts off. The potential at the first capacitor C1 terminal goes through the first resistor R1 to the ground terminal. Adjusting the resistance value of the first resistor R1 changes 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 at the first capacitor C1 terminal reaches the amplitude of the signal at the seventeenth resistor R17 terminal, the first operational amplifier U1 outputs. The signal at the output terminal of the first operational amplifier U1 goes through the source of the sixth field-effect transistor Q6, the drain of the sixth field-effect transistor Q6, and the thirteenth resistor R13 to the ground terminal. The signal at the thirteenth resistor R13 terminal goes through the sixth diode D6 and the tenth resistor R10 to the ground terminal.When the signal at the terminal of the tenth resistor R10 rises, the second operational amplifier U2 outputs again. After the fifth field-effect transistor Q5 is cut off, the time for the potential at the terminal of the first capacitor C1 to drop to the amplitude of the signal at the terminal of the seventeenth resistor R17 is the response period of the detection unit. When the current signal obtained by the coil has a gain, the detection unit re-detects the magnetic flux of the electro-permanent magnet and feeds back a corresponding signal based on the detection result. When the detection unit detects that the magnetic flux of the electro-permanent magnet does not reach 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 U2 feeds back a pulse signal again to make the gain unit feed back a current signal to the coil again and then enter the response period. When the detection unit detects that the magnetic flux of the electro-permanent 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 transistor Q8 is cut off, the seventh triode Q7 is turned on, the third capacitor C3 rises to the initial potential, and the auxiliary control unit is reset. In this way, a multi-level pulse sequence is formed based on the current magnetic flux of the electro-permanent magnet and the set quantitative standard when the degree of magnetic domain flipping is full flipping. In this sequence, the pulse current is increased step by step until the quantitative magnetization is completed, realizing precise quantitative control and reducing energy loss.

[0041] See the appendix 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 this signal. The signal at the fourth connector P4 is connected to the ground terminal via the second resistor R2. The fifth connector P5 / sixth connector P6 is used to receive the channel switching signal for magnetization / demagnetization. The signal at the fifth connector P5 is fed back to the gates of the first field-effect transistor Q1 and the fourth field-effect transistor Q4. The third resistor R3 is used to discharge the parasitic capacitances of the gates of the first field-effect transistor Q1 and the fourth field-effect transistor Q4. When the fifth connector P5 receives the signal feedback, the voltage difference between the gate and the source of the first field-effect transistor Q1 is higher than the conduction threshold, and the first field-effect transistor Q1 conducts and the fourth field-effect transistor Q4 conducts. The signal at the second resistor R2 is connected to the ground terminal via the drain, source of the first field-effect transistor Q1, the coil, the drain, and source of the fourth field-effect transistor Q4. The signal at the sixth connector P6 is fed back to the gates of the second field-effect transistor Q2 and the third field-effect transistor Q3. The fifteenth resistor R15 is used to discharge the parasitic capacitances of the gates of the second field-effect transistor Q2 and the third field-effect transistor Q3. When the sixth connector P6 receives the signal feedback, the voltage difference between the gate and the source of the second field-effect transistor Q2 is higher than the conduction threshold, and the second field-effect transistor Q2 conducts and the third field-effect transistor Q3 conducts. The signal at the second resistor R2 is connected to the ground terminal via the drain, source of the second field-effect transistor Q2, the coil, the drain, and source of the third field-effect transistor Q3. The signal feedback through the fifth connector P5 / sixth connector P6 changes the pulse polarity to adjust the current direction for magnetization / demagnetization. The switching signal is fed back manually / by the terminal. When the demagnetization channel is opened, the detection unit stops the signal feedback to the auxiliary control unit and the gain unit.

[0042] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claimed rights.

Claims

1. A pulse magnetic force quantitative control circuit based on an electro-permanent magnet, comprising 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, 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 electro-permanent magnet and make corresponding feedback based on the detection result. The gain unit is used to amplify the pulsed current signal. 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, a second connector, 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 non-inverting input terminal 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 terminal are connected. The inverting input terminal of the second operational amplifier is connected to one end of the seventh resistor and one end of the ninth resistor. The output terminal of the second operational amplifier, the anode of the first diode, and the second connector terminal are connected. The other end of the eighth resistor, the other end of the ninth resistor are connected to the power supply. The other end of the seventh resistor, the other end of the tenth resistor are connected to the ground terminal. The first connector is used to obtain the enabling signal for magnetization / demagnetization. The signal at the output terminal of the second operational amplifier U2 is the operation signal for magnetization / demagnetization. The operation signal is fed back to the gain unit through the second connector. The non-inverting input terminal of the third operational amplifier, the gate of the fifth field-effect transistor, and the second connector terminal are connected. The inverting input terminal of the third operational amplifier is connected to one end of the sixth resistor. The output terminal of the third operational amplifier is connected to the other end of the sixth resistor and one end of the fourteenth resistor. The non-inverting input terminal of the fourth operational amplifier, one end of the first capacitor, the source of the fifth field-effect transistor, and the other end of the fourteenth resistor are connected. The inverting input terminal of the fourth operational amplifier is connected to one end of the eleventh resistor and one end of the twelfth resistor. The output terminal of the fourth operational amplifier 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. The other end of the first capacitor, the drain of the fifth field-effect transistor, and the other end of the twelfth resistor are connected to the ground terminal. The twelfth resistor and the fourteenth resistor are adjustable resistors.

2. The pulse magnetic force quantitative control circuit based on an electro-permanent magnet according to claim 1, wherein It further includes an auxiliary control unit, and the auxiliary control unit 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 triode is connected to one end of the fifth resistor and one end of the sixteenth resistor. The base of the seventh triode is connected to the cathode of the fourth diode and one end of the nineteenth resistor. The collector of the seventh triode 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 terminal. The anode of the third diode and the anode of the fourth diode are connected to the third connector terminal. The other end of the fifth resistor is connected to the power supply. The other end of the sixteenth resistor, the other end of the eighteenth resistor, the other end of the nineteenth resistor, and the other end of the third capacitor are connected to the ground terminal. The detection unit feeds back a quantitative calibration signal to the auxiliary control unit through the third connector.

3. The pulsed magnetic force quantitative control circuit based on an electro-permanent magnet according to claim 2, 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 non-inverting input terminal of the first operational amplifier is connected to one end of the fourth resistor and one end of the seventeenth resistor. The inverting input terminal of the first operational amplifier is connected to one end of the first resistor and one end of the first capacitor. The output terminal of the first operational amplifier is connected to the source electrode of the sixth field effect transistor. The gate electrode of the sixth field effect transistor is connected to the collector electrode of the seventh triode. The drain electrode 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 terminal. The other end of the fourth resistor is connected to the power supply. The other ends of the first resistor, the thirteenth resistor, and the seventeenth resistor are connected to the ground terminal.

4. The pulsed magnetic force quantitative control circuit based on an electro-permanent magnet according to claim 2, characterized in that, The auxiliary control unit further includes a twentieth resistor; One end of the twentieth resistor is connected to the gate electrode of the eighth field effect transistor, and the other end of the twentieth resistor is connected to the ground terminal.

5. The pulse magnetic force quantitative control circuit based on an electro-permanent magnet according to claim 1, characterized in that, It further includes a switching unit. The switching unit is connected to the gain unit. 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 electrodes of the first field effect transistor, the second field effect transistor, and one end of the second resistor are connected to the fourth connector terminal. The source electrode of the first field effect transistor and the drain electrode of the third field effect transistor are connected to one end of the coil. The gate electrodes of the first field effect transistor and the fourth field effect transistor are connected to the fifth connector terminal. The source electrode of the second field effect transistor and the drain electrode of the fourth field effect transistor are connected to the other end of the coil. The gate electrodes of the second field effect transistor and the third field effect transistor are connected to the sixth connector terminal. The other end of the second resistor, the source electrodes of the third field effect transistor and the fourth field effect transistor are connected to the ground terminal. The current signal fed back by the gain unit is fed back to the switching unit. The fourth connector is used to receive the current signal fed back by the gain unit. The fifth connector and the sixth connector are used to receive the channel switching signals for magnetization and demagnetization.

6. The pulsed magnetic force quantitative control circuit based on an electro-permanent magnet according to claim 5, 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 electrode of the first field effect transistor, and one end of the fifteenth resistor is connected to the gate electrode of the second field effect transistor. The other ends of the third resistor and the fifteenth resistor are connected to the ground terminal.

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