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CN-122001341-A - Multi-pulse excitation generating circuit and control method

CN122001341ACN 122001341 ACN122001341 ACN 122001341ACN-122001341-A

Abstract

The invention relates to the technical field of power electronics, in particular to a multi-pulse excitation generating circuit and a control method. The device comprises a charging module, an energy storage capacitor, a switching device, a control module, an excitation coil, a discharging thyristor module, a voltage acquisition module and a control module, wherein the charging module is used for converting alternating voltage into direct current voltage, the energy storage capacitor is provided with a plurality of different capacitance values, the switching device is arranged corresponding to each energy storage capacitor and is used for controlling whether each energy storage capacitor is connected with a total energy storage circuit or not, the control module is used for controlling the on-off state of each switching device, the excitation coil is used for energy conversion and converting electric energy released by the energy storage capacitor into a pulse magnetic field, the discharging thyristor module is used for controlling the discharging of the energy storage capacitor to the excitation coil, the voltage acquisition module is used for acquiring the voltage of each energy storage capacitor, and the control module is used for controlling the combination state of the corresponding switching devices according to a preset pulse width selection signal, changing the capacitance value of the total energy storage capacitor and realizing the adjustment of output pulse width. The invention breaks through the original pulse magnetic single pulse width output, and realizes the adjustable pulse width, adjustable pulse frequency and adjustable output intensity.

Inventors

  • ZHENG BIN
  • WANG LIYE

Assignees

  • 广州通泽医疗科技有限公司
  • 通泽(湖南)医疗科技有限公司

Dates

Publication Date
20260508
Application Date
20260313

Claims (10)

  1. 1. A multi-pulse excitation generating circuit and a control method are characterized by comprising the following steps: the charging module is used for converting alternating voltage into direct voltage; The energy storage capacitor is provided with a plurality of different capacitance values; the switching device is arranged corresponding to each energy storage capacitor and is used for controlling whether each energy storage capacitor is connected with the total energy storage circuit or not; The control module is used for controlling the on-off state of each switching device; the exciting coil is used for performing energy conversion and converting the electric energy released by the energy storage capacitor into a pulse magnetic field; the discharging thyristor module is used for controlling the discharge of the energy storage capacitor to the exciting coil; the voltage acquisition module is used for acquiring the voltage of each energy storage capacitor; The control module controls the combination state of the corresponding switching devices according to a preset pulse width selection signal, changes the capacitance value of the total energy storage capacitor and realizes the adjustment of the output pulse width.
  2. 2. The multi-pulse excitation circuit of claim 1, wherein the charging module is electrically connected to the plurality of energy storage capacitors, respectively, and charges the energy storage capacitors with a dc voltage.
  3. 3. The multi-pulse excitation generating circuit according to claim 1, wherein each energy storage capacitor is controlled to be connected in parallel to the total energy storage capacitor by using a switching device, the total energy storage capacitors with the number of 2 n -1 different capacitance values are combined by controlling the switching state of the switching device, and n is the number of the energy storage capacitors.
  4. 4. The multi-pulse excitation generating circuit according to claim 1, wherein the control module outputs 100uS trigger signals, the trigger control thyristor module SCR1 is turned on after passing through the isolation transformer T1, the energy storage capacitor forms a discharge loop with the excitation coil L1 and the thyristor module SCR1, the maximum discharge current IMax is approximately Vc/xl=vc/2pi FL, the resonance frequency f=1/(2pi (LC)), the pulse width=1/2F, the current zero crossing thyristor is turned off after passing through a sine wave period to stop discharging, and a trigger signal generates a positive and negative pulse output.
  5. 5. The multi-pulse excitation circuit of claim 1, wherein the energy storage capacitor uses a high voltage thin film capacitor having an ESR of less than 5mΩ.
  6. 6. The multi-pulse excitation generation circuit of any of claims 1-5, wherein the switching device is one of a mechanical relay, a solid state relay, a triac, or a double IGBT.
  7. 7. The multi-pulse excitation generating circuit according to claim 6, wherein 4 capacitors C1-C4 are connected in parallel to the total energy storage capacitor by using 4 relays K1-K4 respectively, and the control module controls states of the 4 relays to control the total capacitance of the energy storage capacitor and change the output pulse width.
  8. 8. The multi-pulse excitation generating circuit according to claim 6, wherein the bi-directional thyristors D1-D4 are used as switches, the control module controls the driving isolation transformers T2-T5, after the output rectifying and filtering, the driving isolation transformers T2-T5 are triggered to be turned on, after the driving of the driving isolation transformers T2-T5 is stopped, the driving isolation transformers T2-T5 are not output, and the driving isolation transformers D1-D4 are turned off.
  9. 9. The multi-pulse excitation generating circuit according to claim 6, wherein two IGBTs Q1 and Q2 are connected in series to serve as a switch, the control module controls the driving isolation transformer T8, after output rectifying and filtering, the Q1 and Q2 are triggered to be simultaneously turned on, after the driving T8 is stopped, the T8 is not output, the Q1 and Q2 are simultaneously turned off, and the other 3 groups of IGBTs are controlled to be turned on and off in a same way.
  10. 10. A control method of a multi-pulse excitation generating circuit, controlling the excitation generating circuit according to any one of claims 1 to 9, characterized by comprising the steps of: S1, controlling a charging module to charge a plurality of energy storage capacitors; S2, controlling the combination states of a plurality of switching devices according to the target pulse width, and selecting a capacitor combination connected into a total energy storage circuit; s3, detecting the voltage of each energy storage capacitor before discharging, and carrying out voltage equalization if the voltage difference exists; S4, triggering the discharge thyristor module to conduct so that the energy storage capacitor discharges through the exciting coil to generate a pulse magnetic field; s5, outputting different pulse widths by controlling the switch device combination.

Description

Multi-pulse excitation generating circuit and control method Technical Field The invention relates to the technical field of power electronics, in particular to a multi-pulse excitation generating circuit and a control method. Background The pulse magnetic stimulation principle is that after an energy storage capacitor is charged to a certain voltage, a thyristor module is used as a solid-state relay to perform switching discharge on an excitation coil, a discharge current flow kA generates a pulse magnetic field with T as a unit, a human body performs non-contact and non-invasive deep treatment, the current waveform of single discharge is a complete sine wave current with positive and negative half cycles, the period is the reciprocal of the resonant frequency (F0=1/(2pi (LC)), the generated pulse magnetic waveform is consistent with the current waveform, and the pulse width is 1/2 period. The pulse magnetic pulse width output by the existing magnetic stimulation product is single, the feeling and treatment effect of a patient can be changed only by changing the frequency of the output pulse string, only one energy storage capacitor and exciting coil are arranged in conventional equipment, 2 parts of exciting coils can be used for different positions, and the coils need to be manually replaced when the output pulse width is changed. Because the energy storage capacitor and the exciting coil are single, the pulse width of the generated magnetic field is single, and 2-3 exciting coils are arranged at the top, and only 2-3 pulse widths are output. Pulse width is one of the key parameters determining the stimulation effect and the feeling of a patient, and directly influences the treatment depth, the activation type of nerve muscles and the tolerance degree of the patient, and the core principle is that pulse width and nerve fibers are in selective activation, the nerve fibers have different diameters and types, the sensitivity of the pulse width to the pulse width is different, the thinner nerve fibers (such as Adelta fibers and C fibers which govern the feeling) are more sensitive to the wider pulse width and are more easily activated, and the thicker motor nerve fibers (Aalpha fibers) and muscle fibers are in good response to the narrower pulse width. Disclosure of Invention The invention aims to solve the problems in the background technology and provides a multi-pulse excitation generating circuit and a control method. According to the technical scheme, the first aspect of the invention provides a multi-pulse excitation generating circuit and a control method, wherein the multi-pulse excitation generating circuit comprises the following components: the charging module is used for converting alternating voltage into direct voltage; The energy storage capacitor is provided with a plurality of different capacitance values; the switching device is arranged corresponding to each energy storage capacitor and is used for controlling whether each energy storage capacitor is connected with the total energy storage circuit or not; The control module is used for controlling the on-off state of each switching device; the exciting coil is used for performing energy conversion and converting the electric energy released by the energy storage capacitor into a pulse magnetic field; the discharging thyristor module is used for controlling the discharge of the energy storage capacitor to the exciting coil; the voltage acquisition module is used for acquiring the voltage of each energy storage capacitor; The control module controls the combination state of the corresponding switching devices according to a preset pulse width selection signal, changes the capacitance value of the total energy storage capacitor and realizes the adjustment of the output pulse width. Preferably, the charging module is electrically connected with the plurality of energy storage capacitors respectively, and uses direct-current voltage to charge the energy storage capacitors. Preferably, each energy storage capacitor is controlled to be connected in parallel to the total energy storage capacitor by using a switching device, the total energy storage capacitors with the number of 2 n -1 different capacitance values are combined by controlling the switching state of the switching device, and n is the number of the energy storage capacitors. Preferably, after the control module outputs a 100uS trigger signal and passes through the isolation transformer T1, the trigger control thyristor module SCR1 is turned on, the energy storage capacitor, the exciting coil L1 and the thyristor module SCR1 form a discharge loop, the maximum discharge current IMax is approximately equal to Vc/XL=Vc/2 pi FL, the resonance frequency F is approximately equal to 1/(2pi (LC)), the pulse width is approximately equal to 1/2F, after the discharge current passes through a sine wave period, the current zero crossing thyristor is turned off, and is turned on to stop discharging,