A bipolar multi-mode magnetic field generator

Abstract

A bipolar multi-mode magnetic field generator comprises a positive polarity circuit, a negative polarity circuit and a load coil; the positive polarity circuit comprises a positive polarity charging module, a positive polarity energy feedback circuit module and n positive polarity single-stage discharge modules; the negative polarity circuit comprises a negative polarity charging module, a negative polarity energy feedback circuit module and n negative polarity single-stage discharge modules. The bipolar pulse magnetic field can be outputted through the synergistic effect of the positive and negative polarity circuits. Meanwhile, the pulse source has an energy feedback circuit structure, and the system energy saving and the coil temperature rise reduction can be realized through the commutation switch. In addition, the pulse source has a modular structure, and the various output modes can be realized through the module switch timing control, thereby greatly improving the output performance of the pulse magnetic field generator on the basis of ensuring the reliable operation. The output mode can be flexibly selected, and the bipolar triangular wave and the bipolar exponential wave output modes can be realized.

Description

Technical Field

[0001] This invention relates to the field of pulsed magnetic field technology, specifically to a bipolar multimode magnetic field generator. Background Technology

[0002] Advances in power electronics technology have led to the rapid development of electroporation, which has been widely researched and applied in fields such as gene transfection, nerve stimulation, and tumor therapy. However, as research deepens and demands increase, problems with electroporation have gradually become apparent. Among various forms of physical fields, magnetic fields, with their strong penetrability and flexible focusing capabilities, are well-suited for biological media. This has led to hopes for research into technologies that utilize magnetic fields to achieve the perforation effect, namely magnetic perforation. As an emerging technology that alters cell membrane permeability, magnetic perforation shows great potential to replace electroporation in areas where it is limited.

[0003] However, a key challenge in realizing magnetic piercing technology lies in the need for a flexible and reliable high-power pulsed magnetic field device. Currently, the integration and optimization of pulsed power technology in magnetic field devices are insufficient compared to pulsed electric field generators, which limits the motivation for research into magnetic piercing technology. To better develop the research and application value of magnetic piercing technology in the biomedical field, designing a flexible and reliable magnetic field generator topology is essential. This would allow for convenient adjustment of parameters such as magnetic field strength, polarity, and rate of change, potentially further advancing experimental research and clinical treatment.

[0004] Traditional high-power magnetic field devices often employ gas spark gap switches and rapid ignition tubes. The semi-controlled nature of these switches and their fixed circuit parameters make it difficult to achieve flexible magnetic field adjustment. Therefore, most can only output oscillating or unipolar pulsed magnetic field waveforms. This significantly limits research into the biological effects determined by magnetic field strength, polarity, and rate of change, and even hinders related research and applications. Furthermore, traditional high-power magnetic field devices suffer from high power loss and low energy utilization. The significant energy consumed by the coil's internal resistance during a single output process leads to severe coil heating, thus posing a potential risk to the application of magnetic perforation technology. Summary of the Invention

[0005] The purpose of this invention is to provide a bipolar multimode magnetic field generator, comprising: a positive polarity circuit, a negative polarity circuit, and a load coil.

[0006] The positive polarity circuit includes a positive polarity charging module, a positive polarity power supply circuit module, and n positive polarity single-stage discharge modules, where n is a positive integer.

[0007] The negative polarity circuit includes a negative polarity charging module, a negative polarity power supply circuit module, and n negative polarity single-stage discharge modules.

[0008] The positive polarity charging module is a capacitor charging module in the positive polarity single-stage discharge module.

[0009] The positive polarity power supply circuit module is used to recover the energy of the load coil and return the energy to the capacitor of the positive polarity single-stage discharge module.

[0010] The positive polarity single-stage discharge module outputs a positive polarity pulse through capacitor discharge.

[0011] The negative polarity charging module is a capacitor charging module in the negative polarity single-stage discharge module.

[0012] The negative polarity power supply circuit module is used to recover the energy of the load coil and return the energy to the capacitor of the negative polarity single-stage discharge module.

[0013] The negative polarity single-stage discharge module outputs a negative polarity pulse through capacitor discharge.

[0014] The positive polarity single-stage discharge module includes a discharge capacitor C. 1i Discharge switch S 1i Freewheeling switch P 1i Charging diode D 1(i+1) , where i = 1, 2, ..., n.

[0015] The charging diode D 1(i+1) Anode-connected discharge capacitor C 1i Then connect the freewheeling switch P 1i The emitter.

[0016] The charging diode D 1(i+1) Cathode connected discharge switch S 1i The collector. Discharge switch S 1i The emitter is connected to the freewheeling switch P. 1i The collector.

[0017] The negative polarity single-stage discharge module includes a discharge capacitor C. 2i Discharge switch S 2i Freewheeling switch P 2i Charging diode D 2(i+1) .

[0018] The charging diode D 2(i+1) Anode-connected discharge capacitor C 2i Then connect the freewheeling switch P 2i The emitter.

[0019] The charging diode D 2(i+1) Cathode connected discharge switch S 2i The collector. Discharge switch S 2i The emitter is connected to the freewheeling switch P.2i The collector.

[0020] The load coil is used to generate a pulsed magnetic field.

[0021] Furthermore, the circuit topology of the n positive polarity single-stage discharge modules is as follows:

[0022] The charging diode D 1(k+1) Cathode connected to charging diode D 1(k+2) The anode, where k = 1, 2, ..., n-1.

[0023] The freewheeling switch P 1k The collector is connected to the freewheeling switch P 1(k+1) The emitter.

[0024] Furthermore, the positive polarity charging module includes a DC power supply U1, a current-limiting resistor R1, and a diode D. 11 .

[0025] The negative terminal of the DC power supply U1 is grounded, and the positive terminal is connected to a current-limiting resistor R1 and then to a diode D. 11 The anode.

[0026] The diode D 11 The cathode is connected to the charging diode D 12 The anode.

[0027] Furthermore, the positive polarity power supply circuit module includes a power supply diode D. 10 , converter switch S 10 .

[0028] The power supply diode D 10 Cathode connected to charging diode D 12 The anode.

[0029] The power supply diode D 10 Anode connection converter switch S 10 The collector. The commutator switch S 10 The emitter is connected to the freewheeling switch P. 11 The emitter.

[0030] The converter switch S 10 The collector is grounded.

[0031] Furthermore, the circuit topology of the n negative polarity single-stage discharge modules is as follows:

[0032] The charging diode D 2(k+1) Cathode connected to charging diode D 2(k+2) The anode, where k = 1, 2, ..., n-1.

[0033] The freewheeling switch P 2k The collector is connected to the freewheeling switch P 2(k+1) The emitter.

[0034] Furthermore, the negative polarity charging module includes a DC power supply U2, a current-limiting resistor R2, and a diode D. 21 .

[0035] The negative terminal of the DC power supply U2 is grounded, and the positive terminal is connected to a current-limiting resistor R2 and then to a diode D. 21 The anode.

[0036] The diode D 21 The cathode is connected to the charging diode D 22 The anode.

[0037] Furthermore, the negative polarity power supply circuit module includes a power supply diode D. 20 , converter switch S 20 .

[0038] The power supply diode D 20 Cathode connected to charging diode D 22 The anode.

[0039] The power supply diode D 20 Anode connection converter switch S 20 The collector. The commutator switch S 20 The emitter is connected to the freewheeling switch P. 21 The emitter.

[0040] The converter switch S 20 The collector is grounded.

[0041] Furthermore, the load coil includes an inductor L and a resistor R.

[0042] Furthermore, the output magnetic field of the magnetic field generator includes a positive polarity triangular wave magnetic field, a negative polarity triangular wave magnetic field, a positive polarity exponential wave magnetic field, and a negative polarity exponential wave magnetic field.

[0043] Furthermore, the working process of the magnetic field generator includes a charging stage, a discharging stage, and a pulse output stage.

[0044] The pulse output stage includes a freewheeling stage and a power feeding stage.

[0045] When the pulse output phase of the magnetic field generator is the freewheeling phase, the magnetic field output by the magnetic field generator is an exponential wave.

[0046] When the pulse output phase of the magnetic field generator is the energy feeding phase, the magnetic field output by the magnetic field generator is a triangular wave magnetic field.

[0047] The technical effects of this invention are undeniable. This invention proposes a bipolar pulsed magnetic field generation technology based on modular circuits. The bipolar multimode pulsed magnetic field device formed based on this technology consists of a positive polarity circuit and a negative polarity circuit combined with a discharge coil. Each polarity circuit consists of a front-end energy feedback circuit and a basic discharge module. Each discharge module mainly consists of two discharge switches. The circuit is flexible, adjustable, and easy to build.

[0048] This invention enables the output of a bipolar pulsed magnetic field through the synergistic effect of positive and negative polarity circuits. Simultaneously, this pulse source features an energy feedback circuit structure, allowing for system energy saving and reduced coil temperature rise via a commutation switch. Furthermore, based on a modular structure, the pulse source can achieve multiple output modes through the timing control of each module's switching, significantly improving the output performance of the pulsed magnetic field generator while ensuring reliable operation.

[0049] The beneficial effects of this invention include:

[0050] 1. This invention allows for flexible selection of output modes, enabling output modes such as bipolar triangular waves and bipolar exponential waves.

[0051] 2. This invention includes a load-side energy feedback function, which can feed the coil energy back to the capacitor in the upper or lower circuit, thereby realizing energy recovery and utilization and reducing coil heating.

[0052] 3. The present invention allows for the selection of the number of discharge modules as needed and the control of the final output voltage, thereby enabling flexible adjustment of the magnetic field change rate and intensity. Attached Figure Description

[0053] Figure 1 Schematic diagram of a modular energy-saving pulsed magnetic field generator;

[0054] Figure 2 This is a schematic diagram of the positive polarity output process of a bipolar multimode pulsed magnetic field generator. Figure 2 (a) is a schematic diagram of the charging stage of the positive polarity circuit; Figure 2 (b) is a schematic diagram of the positive polarity discharge stage; Figure 2 (c) is a schematic diagram of the positive polarity follow current stage; Figure 2 (d) is a schematic diagram of the positive polarity energy feeding stage;

[0055] Figure 3 This is a schematic diagram of the negative polarity output process of a bipolar multimode pulsed magnetic field generator. Figure 3 (a) is a schematic diagram of the charging stage of the negative polarity circuit; Figure 3 (b) is a schematic diagram of the negative polarity discharge stage; Figure 3 (c) is a schematic diagram of the negative polarity follow current stage; Figure 3 (d) is a schematic diagram of the negative polarity energy feeding stage;

[0056] Figure 4 A schematic diagram of the switching drive timing for each mode of the generator; Figure 4 (a) is a schematic diagram of the switching operation timing of the positive polarity exponential wave output mode; Figure 4 (b) is a schematic diagram of the switching operation timing of the negative polarity exponential wave output mode; Figure 4 (c) is a schematic diagram of the switching operation timing of the positive polarity exponential wave output mode; Figure 4 (d) is a schematic diagram of the working timing of the negative polarity exponential wave output mode switch. Detailed Implementation

[0057] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0058] Example 1:

[0059] See Figures 1 to 4 A bipolar multimode magnetic field generator includes: a positive polarity circuit, a negative polarity circuit, and a load coil.

[0060] The positive polarity circuit includes a positive polarity charging module, a positive polarity power supply circuit module, and n positive polarity single-stage discharge modules, where n is a positive integer.

[0061] The negative polarity circuit includes a negative polarity charging module, a negative polarity power supply circuit module, and n negative polarity single-stage discharge modules.

[0062] The positive polarity charging module is a capacitor charging module in the positive polarity single-stage discharge module.

[0063] The positive polarity power supply circuit module is used to recover the energy of the load coil and return the energy to the capacitor of the positive polarity single-stage discharge module.

[0064] The positive polarity single-stage discharge module outputs a positive polarity pulse through capacitor discharge.

[0065] The negative polarity charging module is a capacitor charging module in the negative polarity single-stage discharge module.

[0066] The negative polarity power supply circuit module is used to recover the energy of the load coil and return the energy to the capacitor of the negative polarity single-stage discharge module.

[0067] The negative polarity single-stage discharge module outputs a negative polarity pulse through capacitor discharge.

[0068] The positive polarity single-stage discharge module includes a discharge capacitor C. 1iDischarge switch S 1i Freewheeling switch P 1i Charging diode D 1(i+1) , where i = 1, 2, ..., n.

[0069] The charging diode D 1(i+1) Anode-connected discharge capacitor C 1i Then connect the freewheeling switch P 1i The emitter.

[0070] The charging diode D 1(i+1) Cathode connected discharge switch S 1i The collector. Discharge switch S 1i The emitter is connected to the freewheeling switch P. 1i The collector.

[0071] The negative polarity single-stage discharge module includes a discharge capacitor C. 2i Discharge switch S 2i Freewheeling switch P 2i Charging diode D 2(i+1) .

[0072] The charging diode D 2(i+1) Anode-connected discharge capacitor C 2i Then connect the freewheeling switch P 2i The emitter.

[0073] The charging diode D 2(i+1) Cathode connected discharge switch S 2i The collector. Discharge switch S 2i The emitter is connected to the freewheeling switch P. 2i The collector.

[0074] The load coil is used to generate a pulsed magnetic field.

[0075] Example 2:

[0076] A bipolar multimode magnetic field generator, the main technical contents of which are described in Embodiment 1, and further, the circuit topology of the n positive polarity single-stage discharge modules is as follows:

[0077] The charging diode D 1(k+1) Cathode connected to charging diode D 1(k+2) The anode, where k = 1, 2, ..., n-1.

[0078] The freewheeling switch P 1k The collector is connected to the freewheeling switch P 1(k+1) The emitter.

[0079] Example 3:

[0080] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of Embodiments 1 to 2, further comprising a positive polarity charging module including a DC power supply U1, a current-limiting resistor R1, and a diode D. 11 .

[0081] The negative terminal of the DC power supply U1 is grounded, and the positive terminal is connected to a current-limiting resistor R1 and then to a diode D. 11 The anode.

[0082] The diode D 11 The cathode is connected to the charging diode D 12 The anode.

[0083] Example 4:

[0084] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 1 to 3, further wherein the positive polarity power supply circuit module includes a power supply diode D. 10 , converter switch S 10 .

[0085] The power supply diode D 10 Cathode connected to charging diode D 12 The anode.

[0086] The power supply diode D 10 Anode connection converter switch S 10 The collector. The commutator switch S 10 The emitter is connected to the freewheeling switch P. 11 The emitter.

[0087] The converter switch S 10 The collector is grounded.

[0088] Example 5:

[0089] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 1 to 4, and further, the circuit topology of the n negative polarity single-stage discharge modules is as follows:

[0090] The charging diode D 2(k+1) Cathode connected to charging diode D 2(k+2) The anode, where k = 1, 2, ..., n-1.

[0091] The freewheeling switch P 2k The collector is connected to the freewheeling switch P 2(k+1) The emitter.

[0092] Example 6:

[0093] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 1 to 5, further comprising a negative polarity charging module including a DC power supply U2, a current-limiting resistor R2, and a diode D. 21 .

[0094] The negative terminal of the DC power supply U2 is grounded, and the positive terminal is connected to a current-limiting resistor R2 and then to a diode D. 21 The anode.

[0095] The diode D 21 The cathode is connected to the charging diode D 22 The anode.

[0096] Example 7:

[0097] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 1 to 6, further wherein the negative polarity power supply circuit module includes a power supply diode D. 20 , converter switch S 20 .

[0098] The power supply diode D 20 Cathode connected to charging diode D 22 The anode.

[0099] The power supply diode D 20 Anode connection converter switch S 20 The collector. The commutator switch S 20 The emitter is connected to the freewheeling switch P. 21 The emitter.

[0100] The converter switch S 20 The collector is grounded.

[0101] Example 8:

[0102] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 1 to 7, further wherein the load coil includes an inductor L and a resistor R.

[0103] Example 9:

[0104] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 1 to 8, further wherein the output magnetic field of the magnetic field generator includes a positive polarity triangular wave magnetic field, a negative polarity triangular wave magnetic field, a positive polarity exponential wave magnetic field, and a negative polarity exponential wave magnetic field.

[0105] Example 10:

[0106] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 1 to 9, further wherein the working process of the magnetic field generator includes a charging stage, a discharging stage, and a pulse output stage.

[0107] The pulse output stage includes a freewheeling stage and a power feeding stage.

[0108] When the pulse output phase of the magnetic field generator is the freewheeling phase, the magnetic field output by the magnetic field generator is an exponential wave.

[0109] When the pulse output phase of the magnetic field generator is the energy feeding phase, the magnetic field output by the magnetic field generator is a triangular wave magnetic field.

[0110] Example 11:

[0111] See Figures 1 to 4 A bipolar multimode magnetic field generator includes: a positive polarity circuit, a negative polarity circuit, and a load coil.

[0112] The positive polarity circuit includes a positive polarity charging module, a positive polarity power supply circuit module, and n positive polarity single-stage discharge modules, where n is a positive integer.

[0113] The negative polarity circuit includes a negative polarity charging module, a negative polarity power supply circuit module, and n negative polarity single-stage discharge modules.

[0114] The positive polarity charging module is a capacitor charging module in the positive polarity single-stage discharge module.

[0115] The positive polarity power supply circuit module is used to recover the energy of the load coil and return the energy to the capacitor of the positive polarity single-stage discharge module.

[0116] The positive polarity single-stage discharge module outputs a positive polarity pulse through capacitor discharge.

[0117] The negative polarity charging module is a capacitor charging module in the negative polarity single-stage discharge module.

[0118] The negative polarity power supply circuit module is used to recover the energy of the load coil and return the energy to the capacitor of the negative polarity single-stage discharge module.

[0119] The negative polarity single-stage discharge module outputs a negative polarity pulse through capacitor discharge.

[0120] The positive polarity single-stage discharge module includes a discharge capacitor C. 1i Discharge switch S 1i Freewheeling switch P 1i Charging diode D 1(i+1) , where i = 1, 2, ..., n.

[0121] The charging diode D 1(i+1) Anode-connected discharge capacitor C 1i Then connect the freewheeling switch P 1iThe emitter.

[0122] The charging diode D 1(i+1) Cathode connected discharge switch S 1i The collector. Discharge switch S 1i The emitter is connected to the freewheeling switch P. 1i The collector.

[0123] The negative polarity single-stage discharge module includes a discharge capacitor C. 2i Discharge switch S 2i Freewheeling switch P 2i Charging diode D 2(i+1) .

[0124] The charging diode D 2(i+1) Anode-connected discharge capacitor C 2i Then connect the freewheeling switch P 2i The emitter.

[0125] The charging diode D 2(i+1) Cathode connected discharge switch S 2i The collector. Discharge switch S 2i The emitter is connected to the freewheeling switch P. 2i The collector.

[0126] The load coil is used to generate a pulsed magnetic field.

[0127] like Figure 1 As shown, the overall structure consists of positive and negative polarity circuits. The charging module for the positive and negative polarity circuits is composed of DC power supplies U1 and U2 and current-limiting resistors R1 and R2, respectively. The charging module is connected to diode D. 11 Power is supplied to the capacitors in the positive and negative terminals. The positive and negative power supply circuit modules are respectively composed of power supply diodes D. 10 D 20 and converter S 10 S 20 The switch is the basic structure of a single-stage discharge module, consisting of positive and negative discharge capacitors C. 1i C 2i Discharge switch S 1i S 2i Freewheeling switch P 1i P 2i and charging diode D 1(i+1) D 2(i+1) Composition. A load coil, used to generate a magnetic field, is represented in the circuit by inductance L and resistance R. Positive and negative polarity pulse outputs are controlled by a discharge switch S. 1i S 2i Control, while coil energy recovery is achieved through converter switch S 10 S 20 and freewheeling switch P1i P 2i The state transition is implemented.

[0128] Example 12:

[0129] A bipolar multimode magnetic field generator, the main technical contents of which are described in Embodiment 11, and further, the circuit topology of the n positive polarity single-stage discharge modules is as follows:

[0130] The charging diode D 1(k+1) Cathode connected to charging diode D 1(k+2) The anode, where k = 1, 2, ..., n-1.

[0131] The freewheeling switch P 1k The collector is connected to the freewheeling switch P 1(k+1) The emitter.

[0132] Example 13:

[0133] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 12, further comprising a positive polarity charging module including a DC power supply U1, a current-limiting resistor R1, and a diode D. 11 .

[0134] The negative terminal of the DC power supply U1 is grounded, and the positive terminal is connected to a current-limiting resistor R1 and then to a diode D. 11 The anode.

[0135] The diode D 11 The cathode is connected to the charging diode D 12 The anode.

[0136] Example 14:

[0137] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 13, further wherein the positive polarity power supply circuit module includes a power supply diode D. 10 , converter switch S 10 .

[0138] The power supply diode D 10 Cathode connected to charging diode D 12 The anode.

[0139] The power supply diode D 10 Anode connection converter switch S 10 The collector. The commutator switch S 10 The emitter is connected to the freewheeling switch P. 11 The emitter.

[0140] The converter switch S 10The collector is grounded.

[0141] Example 15:

[0142] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 14, and further, the circuit topology of the n negative polarity single-stage discharge modules is as follows:

[0143] The charging diode D 2(k+1) Cathode connected to charging diode D 2(k+2) The anode, where k = 1, 2, ..., n-1.

[0144] The freewheeling switch P 2k The collector is connected to the freewheeling switch P 2(k+1) The emitter.

[0145] Example 16:

[0146] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 15, further comprising a negative polarity charging module including a DC power supply U2, a current-limiting resistor R2, and a diode D. 21 .

[0147] The negative terminal of the DC power supply U2 is grounded, and the positive terminal is connected to a current-limiting resistor R2 and then to a diode D. 21 The anode.

[0148] The diode D 21 The cathode is connected to the charging diode D 22 The anode.

[0149] Example 17:

[0150] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 16, further wherein the negative polarity power supply circuit module includes a power supply diode D. 20 , converter switch S 20 .

[0151] The power supply diode D 20 Cathode connected to charging diode D 22 The anode.

[0152] The power supply diode D 20 Anode connection converter switch S 20 The collector. The commutator switch S 20 The emitter is connected to the freewheeling switch P. 21 The emitter.

[0153] The converter switch S 20 The collector is grounded.

[0154] Example 18:

[0155] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 17, further wherein the load coil includes an inductor L and a resistor R.

[0156] Example 19:

[0157] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 18, further wherein the output magnetic field of the magnetic field generator includes a positive polarity triangular wave magnetic field, a negative polarity triangular wave magnetic field, a positive polarity exponential wave magnetic field, and a negative polarity exponential wave magnetic field.

[0158] The bipolar multimode pulse magnetic field generator has two output modes: 1. Positive polarity exponential wave output mode, 2. Negative polarity exponential wave output mode, 3. Positive polarity triangular wave output mode, and 4. Negative polarity triangular wave output mode.

[0159] Example 20:

[0160] A bipolar multimode magnetic field generator, the main technical contents of which are described in any one of embodiments 11 to 19, further wherein the working process of the magnetic field generator includes a charging stage, a discharging stage, and a pulse output stage.

[0161] The pulse output stage includes a freewheeling stage and a power feeding stage.

[0162] When the pulse output phase of the magnetic field generator is the freewheeling phase, the magnetic field output by the magnetic field generator is an exponential wave.

[0163] When the pulse output phase of the magnetic field generator is the energy feeding phase, the magnetic field output by the magnetic field generator is a triangular wave magnetic field.

[0164] Each mode consists of three working phases: I. Charging phase, II. Discharging phase, and III. Freewheeling / Power feeding phase.

[0165] 1. Positive polarity output mode

[0166] Phase 1: Charging Stage: In this stage, the positive polarity circuit charging module charges each stage of capacitors. During this process, the discharge switch S... 1i It is in the off state, while the converter switch S 10 and freewheeling switch P 1i When the circuit is closed, the capacitors at each stage of the positive polarity circuit are charged in parallel, such as... Figure 2 (a).

[0167] II. Discharge Stage: After the capacitor is fully charged, the main switches S of each discharge module in the positive polarity circuit... 1i and converter switch S 10 Close the freewheeling switch P1i Disconnect the negative polarity circuit freewheeling switch P. 2i When the circuit is turned on, the system enters the positive polarity discharge stage. At this time, if the entire positive polarity circuit is discharged, the main switch S of the module... 1i When conduction occurs, all capacitors in series discharge to the load coil, thus achieving a multiplication of the output voltage by a factor of n. Within a short time, capacitor C... 1i It can be considered a constant voltage source. At this time, the circuit operates as follows: Figure 2 (b)

[0168] Since parameters such as the magnetic field strength and rate of change of the magnetic field output by the load coil depend on the system output voltage, the main switch S of each stage of the positive polarity discharge module can be adjusted when the load coil remains unchanged. 1i The parameters related to the output magnetic field of the coil are controlled by the conduction timing, the number of conduction modules, etc.

[0169] III. Freewheeling Stage: When the discharge task is completed, the positive polarity circuit main switch S... 1i Disconnect, positive polarity circuit freewheeling switch P 1i and negative polarity circuit freewheeling switch P 2i All switches are closed, and the converter switch S is activated simultaneously. 10 If the circuit remains closed, the load coil current will flow through the commutator switch S. 10 S 20 and freewheeling switch P 1i P 2i This forms a closed loop as shown in the figure.

[0170] In the positive polarity exponential wave output mode, the coil energy will eventually be gradually consumed through the line resistance and coil resistance, resulting in an exponential current tail with a long duration. The coil temperature rises, and a corresponding exponential wave pulsed magnetic field is output from the coil. The timing sequence of each switching stage is as follows: Figure 4 As shown in (a).

[0171] III. Energy feeding stage is as follows: If the current switch S is disconnected after the positive polarity circuit discharge stage is completed... 10 The load coil current will pass through the commutation switch S 20 Freewheeling switch P 1i and charging diode D 1(i+1) Return to capacitors C at each stage 1i This allows for the recovery of residual energy from the coil.

[0172] In the positive polarity triangular wave output mode, most of the coil energy can be returned to the capacitors at each stage through the power feeding circuit, and a small amount is dissipated through the coil and line internal resistance, thereby achieving capacitor voltage recovery, reducing coil temperature rise and the requirements for system charging power. Meanwhile, in the commutator switch S... 10In the off state, the voltage across the switch will be stabilized at the single-stage capacitor voltage U. C1 This ensures that switch S 10 It is not broken down by the inductor voltage. At the same time, the coil voltage is stabilized at U after commutation. C1 This maintains a linear rate of change of the magnetic field along the falling edge, ultimately resulting in a positive polarity triangular pulse magnetic field output from the coil. The operating timing of each switch stage is as follows: Figure 4 As shown in (c).

[0173] 2. Negative polarity output mode

[0174] Phase 1: Charging Stage: In this stage, the negative polarity circuit charging module charges each stage of capacitors. During this process, the discharge switch S... 2i and converter switch S 20 It is in the off state, while the freewheeling switch P 2i When the circuit is closed, the capacitors at each stage of the negative polarity circuit are charged in parallel, such as... Figure 3 (a).

[0175] II. Discharge Stage: After the capacitor is fully charged, the main switches S of each discharge module in the negative polarity circuit... 2i Close the freewheeling switch P 2i Disconnect, positive polarity circuit freewheeling switch P 1i When the circuit is turned on, the system enters the negative polarity discharge stage. At this time, if the entire negative polarity circuit is discharged, the module's main switch S... 2i When conduction occurs, all capacitors in series discharge to the load coil, thus achieving a multiplication of the output voltage by a factor of n. Within a short time, capacitor C... 2i It can be considered a constant voltage source. At this time, the circuit operates as follows: Figure 3 (b)

[0176] In the same positive polarity discharge mode, parameters such as the magnetic field strength and rate of change of the magnetic field output by the load coil depend on the system output voltage. Therefore, with the load coil remaining constant, the parameters can be adjusted by setting the main switch S of each stage of the positive polarity discharge module. 1i The parameters related to the output magnetic field of the coil are controlled by the conduction timing, the number of conduction modules, etc.

[0177] III. Freewheeling Stage: When the discharge task is completed, the negative polarity circuit main switch S... 2i Disconnect, positive polarity circuit freewheeling switch P 1i and negative polarity circuit freewheeling switch P 2i All switches are closed, and the converter switch S is activated simultaneously. 20 If the circuit remains closed, the load coil current will flow through the commutator switch S. 10 S 20 and freewheeling switch P 1i P 2i This forms a closed loop as shown in the figure.

[0178] Similar to the positive polarity output mode, in the negative polarity exponential wave output mode, the coil energy will eventually be gradually consumed through the internal resistance of the circuit and the coil itself, resulting in an exponential current tail with a longer duration. The coil temperature rises, and a corresponding exponential wave pulsed magnetic field is output from the coil. The timing sequence of each switching stage is as follows: Figure 4 As shown in (b).

[0179] III. Energy feeding stage is as follows: If the converter switch S is disconnected after the discharge stage of the negative polarity circuit is completed... 20 The load coil current will pass through the commutation switch S 10 Freewheeling switch P 1i and charging diode D 1(i+1) Return to capacitors C at each stage 1i This allows for the recovery of residual energy from the coil.

[0180] In the negative polarity triangular wave output mode, most of the coil energy can be returned to the capacitors at each stage through the power feeding circuit, and a small amount is dissipated through the coil and line internal resistance, thereby achieving capacitor voltage recovery, reducing coil temperature rise and the requirements for system charging power. Meanwhile, in the commutator switch S... 20 In the off state, the voltage across the switch will be stabilized at the single-stage capacitor voltage U. C2 This ensures that switch S 20 It is not broken down by the inductor voltage. At the same time, the coil voltage is stabilized at U after commutation. C2 This maintains a linear rate of change of the magnetic field along the falling edge, ultimately resulting in a negative polarity triangular wave pulse magnetic field output from the coil. The timing sequence of each stage of the switching process is as follows: Figure 4 As shown in (d).

[0181] Example 21:

[0182] See Figures 1 to 4 A bipolar multimode magnetic field generator, the main technical contents of which include:

[0183] like Figure 1 As shown, the overall structure consists of positive and negative polarity circuits. The charging module for the positive and negative polarity circuits is composed of DC power supplies U1 and U2 and current-limiting resistors R1 and R2, respectively. The charging module is connected to diode D. 11 Power is supplied to the capacitors in the positive and negative terminals. The positive and negative power supply circuit modules are respectively composed of power supply diodes D. 10 D 20 and converter S 10 S 20 The switch is the basic structure of a single-stage discharge module, consisting of positive and negative discharge capacitors C. 1i C 2i Discharge switch S 1i S 2i Freewheeling switch P 1i P2i and charging diode D 1(i+1) D 2(i+1) Composition. A load coil, used to generate a magnetic field, is represented in the circuit by inductance L and resistance R. Positive and negative polarity pulse outputs are controlled by a discharge switch S. 1i S 2i Control, while coil energy recovery is achieved through converter switch S 10 S 20 and freewheeling switch P 1i P 2i The state transition is implemented.

[0184] The bipolar multi-mode pulsed magnetic field generator has two output modes: 1. Positive polarity exponential wave output mode, 2. Negative polarity exponential wave output mode, 3. Positive polarity triangular wave output mode, and 4. Negative polarity triangular wave output mode. Each mode includes three operating stages: I. Charging stage, II. Discharging stage, and III. Freewheeling / power feeding stage. The specific operating process is as follows:

[0185] 1. Positive polarity exponential wave output mode

[0186] Phase 1: Charging Stage: In this stage, the positive polarity circuit charging module charges each stage of capacitors. During this process, the discharge switch S... 1i It is in the off state, while the converter switch S 10 and freewheeling switch P 1i When the circuit is closed, the capacitors at each stage of the positive polarity circuit are charged in parallel, such as... Figure 2 (a).

[0187] II. Discharge Stage: After the capacitor is fully charged, the main switches S of each discharge module in the positive polarity circuit... 1i and converter switch S 10 Close the freewheeling switch P 1i Disconnect the negative polarity circuit freewheeling switch P. 2i When the circuit is turned on, the system enters the positive polarity discharge stage. At this time, if the entire positive polarity circuit is discharged, the main switch S of the module... 1i When conduction occurs, all capacitors in series discharge to the load coil, thus achieving a multiplication of the output voltage by a factor of n. Within a short time, capacitor C... 1i It can be considered a constant voltage source. At this time, the circuit operates as follows: Figure 2 (b)

[0188] Since parameters such as the magnetic field strength and rate of change of the magnetic field output by the load coil depend on the system output voltage, the main switch S of each stage of the positive polarity discharge module can be adjusted when the load coil remains unchanged. 1i The parameters related to the output magnetic field of the coil are controlled by the conduction timing, the number of conduction modules, etc.

[0189] III. Freewheeling Stage: When the discharge task is completed, the positive polarity circuit main switch S... 1i Disconnect, positive polarity circuit freewheeling switch P 1i and negative polarity circuit freewheeling switch P 2i All switches are closed, and the converter switch S is activated simultaneously. 10 If the circuit remains closed, the load coil current will flow through the commutator switch S. 10 S 20 and freewheeling switch P 1i P 2i This forms a closed loop as shown in the figure.

[0190] In the positive polarity exponential wave output mode, the coil energy will eventually be gradually consumed through the line resistance and coil resistance, resulting in an exponential current tail with a long duration. The coil temperature rises, and a corresponding exponential wave pulsed magnetic field is output from the coil. The timing sequence of each switching stage is as follows: Figure 4 As shown in (a).

[0191] 2. Negative polarity exponential wave output mode

[0192] Phase 1: Charging Stage: In this stage, the negative polarity circuit charging module charges each stage of capacitors. During this process, the discharge switch S... 2i and converter switch S 20 It is in the off state, while the freewheeling switch P 2i When the circuit is closed, the capacitors at each stage of the negative polarity circuit are charged in parallel, such as... Figure 3 (a).

[0193] II. Discharge Stage: After the capacitor is fully charged, the main switches S of each discharge module in the negative polarity circuit... 2i Close the freewheeling switch P 2i Disconnect, positive polarity circuit freewheeling switch P 1i When the circuit is turned on, the system enters the negative polarity discharge stage. At this time, if the entire negative polarity circuit is discharged, the module's main switch S... 2i When conduction occurs, all capacitors in series discharge to the load coil, thus achieving a multiplication of the output voltage by a factor of n. Within a short time, capacitor C... 2i It can be considered a constant voltage source. At this time, the circuit operates as follows: Figure 3 (b)

[0194] In the same positive polarity discharge mode, parameters such as the magnetic field strength and rate of change of the magnetic field output by the load coil depend on the system output voltage. Therefore, with the load coil remaining constant, the parameters can be adjusted by setting the main switch S of each stage of the positive polarity discharge module. 1i The parameters related to the output magnetic field of the coil are controlled by the conduction timing, the number of conduction modules, etc.

[0195] III. Freewheeling Stage: When the discharge task is completed, the negative polarity circuit main switch S... 2iDisconnect, positive polarity circuit freewheeling switch P 1i and negative polarity circuit freewheeling switch P 2i All switches are closed, and the converter switch S is activated simultaneously. 20 If the circuit remains closed, the load coil current will flow through the commutator switch S. 10 S 20 and freewheeling switch P 1i P 2i This forms a closed loop as shown in the figure.

[0196] Similar to the positive polarity output mode, in the negative polarity exponential wave output mode, the coil energy will eventually be gradually consumed through the internal resistance of the circuit and the coil itself, resulting in an exponential current tail with a longer duration. The coil temperature rises, and a corresponding exponential wave pulsed magnetic field is output from the coil. The timing sequence of each switching stage is as follows: Figure 4 As shown in (b).

[0197] 3. Positive polarity triangular wave output mode

[0198] The charging phase (I) and discharging phase (II) of the positive polarity triangular wave output mode are the same as those of the positive polarity exponential wave output mode, and will not be described again here.

[0199] III. Energy feeding stage is as follows: If the current switch S is disconnected after the positive polarity circuit discharge stage is completed... 10 The load coil current will pass through the commutation switch S 20 Freewheeling switch P 1i and charging diode D 1(i+1) Return to capacitors C at each stage 1i This allows for the recovery of residual energy from the coil.

[0200] In the positive polarity triangular wave output mode, most of the coil energy can be returned to the capacitors at each stage through the power feeding circuit, and a small amount is dissipated through the coil and line internal resistance, thereby achieving capacitor voltage recovery, reducing coil temperature rise and the requirements for system charging power. Meanwhile, in the commutator switch S... 10 In the off state, the voltage across the switch will be stabilized at the single-stage capacitor voltage U. C1 This ensures that switch S 10 It is not broken down by the inductor voltage. At the same time, the coil voltage is stabilized at U after commutation. C1 This maintains a linear rate of change of the magnetic field along the falling edge, ultimately resulting in a positive polarity triangular pulse magnetic field output from the coil. The operating timing of each switch stage is as follows: Figure 4 As shown in (c).

[0201] 4. Negative polarity triangular wave output mode

[0202] The charging phase (I) and discharging phase (II) of the negative polarity triangular wave output mode are the same as those of the negative polarity exponential wave output mode, and will not be described again here.

[0203] III. Energy feeding stage is as follows: If the converter switch S is disconnected after the discharge stage of the negative polarity circuit is completed... 20 The load coil current will pass through the commutation switch S 10 Freewheeling switch P 1i and charging diode D 1(i+1) Return to capacitors C at each stage 1i This allows for the recovery of residual energy from the coil.

[0204] In the negative polarity triangular wave output mode, most of the coil energy can be returned to the capacitors at each stage through the power feeding circuit, and a small amount is dissipated through the coil and line internal resistance, thereby achieving capacitor voltage recovery, reducing coil temperature rise and the requirements for system charging power. Meanwhile, in the commutator switch S... 20 In the off state, the voltage across the switch will be stabilized at the single-stage capacitor voltage U. C2 This ensures that switch S 20 It is not broken down by the inductor voltage. At the same time, the coil voltage is stabilized at U after commutation. C2 This maintains a linear rate of change of the magnetic field along the falling edge, ultimately resulting in a negative polarity triangular wave pulse magnetic field output from the coil. The timing sequence of each stage of the switching process is as follows: Figure 4 As shown in (d).

[0205] In summary, addressing the challenges of traditional magnetic field generators, such as insufficient flexibility and poor adjustability of the output magnetic field waveform, severe coil overheating, and low energy utilization, a bipolar multi-mode pulsed magnetic field generation technology has been developed. Based on this technology, the pulse source can output a bipolar pulsed magnetic field through the synergistic effect of positive and negative polarity circuits. Simultaneously, this pulse source features an energy feedback circuit structure, enabling system energy saving and reducing coil temperature rise through a commutation switch. Furthermore, based on a modular structure, the pulse source can achieve multiple output modes through the timing control of the switching of each module, significantly improving the output performance of the pulsed magnetic field generator while ensuring reliable operation.

Claims

1. A bipolar multi-mode magnetic field generator, characterized in that, include: Positive polarity circuit, negative polarity circuit, load coil; The positive polarity circuit includes a positive polarity charging module, a positive polarity power supply circuit module, and n positive polarity single-stage discharge modules, where n is a positive integer; The negative polarity circuit includes a negative polarity charging module, a negative polarity power supply circuit module, and n negative polarity single-stage discharge modules. The positive polarity charging module is a capacitor charging module in the positive polarity single-stage discharge module; The positive polarity power supply circuit module is used to recover the energy of the load coil and recover the energy into the capacitor of the positive polarity single-stage discharge module; The positive polarity single-stage discharge module discharges through a capacitor and outputs a positive polarity pulse; The negative polarity charging module is a capacitor charging module in the negative polarity single-stage discharge module. The negative polarity power supply circuit module is used to recover the energy of the load coil and recover the energy into the capacitor of the negative polarity single-stage discharge module; The negative polarity single-stage discharge module discharges through a capacitor and outputs a negative polarity pulse; The positive polarity single-stage discharge module comprises a discharge capacitor , a discharge switch , a freewheeling switch , a charging diode , wherein i = 1, 2,..., n; The charging diode Anode connected discharge capacitor Post access freewheeling switch Emiter the charging diode the cathode of the discharge switch the collector of the discharge switch the emitter of the freewheeling switch the collector of the freewheeling switch The negative polarity single-stage discharge module comprises a discharge capacitor , a discharge switch , a freewheeling switch , a charge diode ; the charging diode anode connected to a discharge capacitor post-rectifier freewheeling switch emitter the charging diode the cathode of the discharge switch the collector of the discharge switch the emitter of the freewheeling switch the collector of the freewheeling switch The load coil is used to generate a pulsed magnetic field; The circuit topology of the n positive polarity single-stage discharge modules is shown below: the charging diode the cathode of the charging diode the anode of the charging diode, wherein k = 1, 2,..., n - 1; The freewheeling switch The collector connection of the freewheeling switch The emitter of the freewheeling switch The positive polarity energy feeding circuit module comprises an energy feeding diode , a commutation switch ; The energy harvesting diode a cathode of the charging diode an anode of the charging diode The energy feeding diode Anode connection commutation switch Collector; commutation switch Emiter connection freewheeling switch Emiter; The commutation switch of the collector ground.

2. A bipolar multi-modal magnetic field generator according to claim 1, characterized in that, The positive polarity charging module includes a direct current power supply , a current limiting resistor , a diode ; The DC power supply The negative terminal is grounded, and the positive terminal is connected to a current-limiting resistor. After connecting diode anode; The diode The cathode of the diode is connected to the anode of the charging diode The anode of the diode is connected to the cathode of the charging diode 3. A bipolar multi-modal magnetic field generator according to claim 1, wherein, The circuit topology of the n negative polarity single-stage discharge modules is shown below: the charging diode the cathode of the charging diode the anode of the charging diode, wherein k = 1, 2,..., n - 1; The freewheeling switch The collector connection of the freewheeling switch The emitter of the freewheeling switch 4. A bipolar multi-modal magnetic field generator according to claim 1, characterized in that, The negative polarity charging module includes a direct current power supply , a current limiting resistor , a diode ; The direct current power supply One end of the negative electrode is grounded, and one end of the positive electrode is connected with a current-limiting resistor The back access diode The anode of the diode the cathode of the diode is connected to the anode of the diode is connected to the cathode of the diode 5. A bipolar multi-modal magnetic field generator according to claim 1, wherein, The negative polarity power supply circuit module includes a power supply diode. , converter switch ; The energy harvesting diode The cathode of the charging diode The anode of the charging diode The energy feeding diode The anode connection commutation switch The collector; commutation switch The emitter connection freewheeling switch The emitter; The commutation switch of the collector ground.

6. A bipolar multi-modal magnetic field generator according to claim 1, wherein, The load coil includes an inductor L and a resistor R.

7. A bipolar multi-modal magnetic field generator according to claim 1, wherein, The output magnetic field of the magnetic field generator includes a positive polarity triangular wave magnetic field, a negative polarity triangular wave magnetic field, a positive polarity exponential wave magnetic field, and a negative polarity exponential wave magnetic field.

8. A bipolar multi-modal magnetic field generator according to claim 1, wherein, The working process of the magnetic field generator includes a charging stage, a discharging stage, and a pulse output stage. The pulse output stage includes a freewheeling stage and a power feeding stage; When the pulse output phase of the magnetic field generator is the freewheeling phase, the magnetic field output by the magnetic field generator is an exponential wave magnetic field. When the pulse output phase of the magnetic field generator is the energy feeding phase, the magnetic field output by the magnetic field generator is a triangular wave magnetic field.

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