Novel power supply topology control system and method for transcranial magnetic stimulator

Abstract

The application discloses a novel power supply topology control system and method for a transcranial magnetic stimulator, relates to the technical field of medical instrument power supply, and comprises the following steps: obtaining a stimulation intensity level and converting the stimulation intensity level into a target charging voltage value, and reversely calculating a target trigger phase angle; starting timing at the zero-crossing moment of each power frequency half cycle, calculating a delay trigger time according to the power frequency half cycle length and the target trigger phase angle, and generating a trigger enable signal when the timing reaches the delay trigger time; collecting a current voltage feedback value of a direct-current energy storage end at the energy transmission end moment of each power frequency charging cycle, comparing the current voltage feedback value with the target charging voltage value, and stopping the generation of a subsequent trigger enable signal and entering a standby state when a standard judgment condition is met; and recalculating the target trigger phase angle and switching execution when the stimulation intensity level is changed. The application eliminates electromagnetic interference from the source by using power frequency voltage doubling technology, reduces the system cost, and simplifies the circuit structure.

Description

Technical Field

[0001] This invention relates to the field of medical device power supply technology, specifically to a novel power supply topology control system and method for transcranial magnetic stimulation devices. Background Technology

[0002] The core component of a transcranial magnetic stimulation (TMS) device is the high-voltage pulse generation circuit, which converts low-voltage electrical energy provided by mains power or batteries into instantaneous high-voltage high current. This high-intensity pulsed magnetic field is generated through the stimulation coil. The performance of the high-voltage generation circuit directly determines the stimulation intensity, stability, and safety of the device.

[0003] Currently, most mainstream transcranial magnetic stimulation (TMS) devices, both domestically and internationally, employ high-frequency switching power supply technology for their high-voltage generation modules. Among these, phase-shifted full-bridge resonant converters and LLC topologies are the most widely used. These solutions achieve voltage transformation and regulation through high-frequency switching, offering advantages in efficiency and power density.

[0004] However, the existing solutions mentioned above have the following drawbacks: high-frequency switching operations generate severe electromagnetic interference, making it difficult for the equipment to pass electromagnetic compatibility tests, requiring additional complex filtering circuits and shielding structures; to achieve high-voltage output, a large number of switching transistors and magnetic devices are required, resulting in a complex hardware architecture, a large number of components, high overall cost, and difficult maintenance; at the same time, the complex filtering circuits, heat dissipation systems, and large magnetic devices make it difficult to miniaturize and lighten the high-voltage generation module. Summary of the Invention

[0005] The purpose of this invention is to provide a novel power topology control system and method for transcranial magnetic stimulation devices to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a novel power supply topology control system and method for a transcranial magnetic stimulation device. The methods include: Step S1: Obtain the stimulation intensity level, convert the stimulation intensity level into a target charging voltage value based on the linear correspondence between the stimulation intensity level and the pulse capacitor voltage; and calculate the target trigger phase angle corresponding to the target charging voltage value based on the correspondence between the capacitor charging voltage and the trigger phase angle. Step S2: Obtain the zero-crossing synchronization signal of the power frequency AC power supply, start timing at the zero-crossing moment of each power frequency half-cycle, calculate the delayed trigger time based on the half-cycle duration of the power frequency AC power supply and the target trigger phase angle, and when the real-time timing duration reaches the delayed trigger time, generate a trigger enable signal with a fixed pulse width and maintain the output until the current half-cycle ends. Step S3: At the end of the energy transfer in each power frequency charging cycle, collect the current voltage feedback value of the DC energy storage terminal and compare the current voltage feedback value with the target charging voltage value; Step S4: If the current voltage feedback value meets the preset charging standard determination condition, then the charging is determined to be complete, and the generation of the trigger enable signal for all subsequent half-cycles of the power frequency is immediately stopped, so that the charging process is naturally cut off and the system enters the standby state. Step S5: When the stimulation intensity level changes, immediately interrupt the current control parameters, jump to step S1 to recalculate the new target trigger phase angle, and from the zero crossing moment of the next power frequency charging cycle, execute steps S2 to S4 according to the updated control parameters to achieve smooth transition adjustment of the output voltage.

[0007] Furthermore, step S1 includes: Step S1-1: Define the range of values ​​for the stimulus intensity level as P. min To P max The maximum peak voltage of a single pulse capacitor is defined as U. max Obtain the stimulus intensity level P, and calculate the target charging voltage value U of a single pulse capacitor according to the linear correspondence between the stimulus intensity level and the pulse capacitor voltage. target =((PP min ) / (P max -P min ))×U max Among them, P min The target charging voltage for level P is 0V. max The target charging voltage value corresponding to the level is U max ; Step S1-2: Based on the correspondence between the capacitor charging voltage and the trigger phase angle, calculate the value U corresponding to the target charging voltage. target The corresponding target trigger phase angle α: U target =U max ×(1+cosα) / 2; Performing a reverse transformation on the above formula, we get α=arccos(2U target / U max -1); where α is the trigger phase angle, and its value ranges from 0° to 180°; when α takes the minimum value, it corresponds to the maximum output voltage, and when α takes the maximum value, it corresponds to the minimum output voltage.

[0008] Furthermore, step S2 includes: Step S2-1: Obtain the zero-crossing synchronization signal of the power frequency AC power supply, and identify the zero-crossing time of each half-cycle of the power frequency according to the zero-crossing synchronization signal; the zero-crossing time includes the zero-crossing time of the positive half-cycle and the zero-crossing time of the negative half-cycle, which are 180° out of phase. Step S2-2: Using the zero-crossing moment of the current half-cycle of the power frequency as the timing reference point, and based on the half-cycle duration T of the power frequency AC power supply... half Using the target trigger phase angle α obtained in step S1-2, calculate the delay trigger time t of the current power frequency half-cycle. delay =T half ×α / α max ;where α max This is the maximum value of the trigger phase angle; Step S2-3: Start timing at the zero-crossing moment of the current half-cycle of the power frequency, and when the real-time timing duration reaches the delay trigger time t... delay When the current power frequency half-cycle ends, a trigger enable signal with a fixed pulse width is generated and output, and the trigger enable signal automatically terminates after the current power frequency half-cycle ends.

[0009] Furthermore, step S3 includes: Step S3-1: Obtain the voltage sampling signal of the DC energy storage terminal through resistor voltage divider isolation sampling, and perform proportional conversion and filtering on the voltage sampling signal to obtain the current voltage feedback value V. fb ; Step S3-2: Detect the end time of energy transmission in the current power frequency charging cycle; the end time of energy transmission is the time when the trigger enable signal of the last power frequency half-cycle in the current power frequency charging cycle terminates. Step S3-3: At the end of the energy transfer, the current voltage feedback value V is... fb The target charging voltage value U calculated in step S1-1 target If the current voltage feedback value meets the charging compliance determination condition V, then... fb ≥U target If the charging of the DC energy storage terminal is completed within the current power frequency charging cycle, then it is determined that the charging of the DC energy storage terminal is complete.

[0010] Furthermore, step S4 includes: Step S4-1: Immediately stop generating trigger enable signals for all subsequent power frequency half-cycles, so that no triggering action is generated within each power frequency half-cycle. Step S4-2: After the current half-cycle of the power frequency ends, the output trigger enable signal will automatically terminate, each power branch will naturally turn off, the main charging circuit will be completely disconnected, the DC energy storage terminal voltage will stop rising, and the charging process will be terminated. Step S4-3: The system enters standby mode. In standby mode, the voltage sampling and monitoring function and external command detection function of the DC energy storage terminal are retained, but active charging operation is not performed.

[0011] Furthermore, step S5 includes: Step S5-1: Monitor the stimulus intensity level in real time. When a change in the current stimulus intensity level P is detected, immediately interrupt the currently executing control parameters. Step S5-2: Jump to step S1 to obtain the changed stimulus intensity level P a Recalculate the new target charging voltage value U according to step S1-1. target,a =((P a -P min ) / (P max -P min ))×U max And recalculate the new target trigger phase angle α according to steps S1-2. a =arccos(2U target,a / U max -1); Step S5-3: Maintain the original triggering action unchanged within the current power frequency charging cycle. After the current power frequency charging cycle ends, starting from the zero-crossing moment of the next power frequency charging cycle, trigger the new target triggering phase angle α according to the updated parameters. a Proceed through steps S2 to S4.

[0012] The system includes: an industrial frequency AC power input terminal, a first-stage voltage multiplier rectifier unit, a second-stage thyristor voltage regulation and control unit, and an energy storage output terminal; The power frequency AC power input terminal is connected to the first-stage voltage multiplier rectifier unit for connecting to power frequency AC power; The first-stage voltage multiplier rectifier unit is connected to the second-stage thyristor voltage regulation control unit, which is used to convert the power frequency AC power into high-voltage DC bus voltage; The second-stage thyristor voltage regulation control unit is connected to the energy storage output terminal and is used to perform phase control voltage regulation on the high-voltage DC bus voltage and then output it to the energy storage output terminal. The energy storage output terminal is used to store electrical energy to supply the magnetic stimulation coil for discharge.

[0013] The first-stage voltage multiplier rectifier unit includes a first rectifier diode D1, a second rectifier diode D2, a first energy storage capacitor C1, and a second energy storage capacitor C2; The first end of the power frequency AC power input terminal is connected to the anode of the first rectifier diode D1 and the cathode of the second rectifier diode D2, respectively. The second end of the power frequency AC power input terminal is connected to the second end of the first energy storage capacitor C1 and the first end of the second energy storage capacitor C2, respectively. The second end of the first energy storage capacitor C1 and the first end of the second energy storage capacitor C2 are connected and form a common midpoint. The cathode of the first rectifier diode D1 is connected to the first end of the first energy storage capacitor C1, and the anode of the second rectifier diode D2 is connected to the second end of the second energy storage capacitor C2.

[0014] The second-stage thyristor voltage regulation control unit includes a first unidirectional thyristor TR1, a second unidirectional thyristor TR2, a first current-limiting resistor R1, and a second current-limiting resistor R2. The first terminal of the first unidirectional thyristor TR1 is connected to the first terminal of the first energy storage capacitor C1, and the second terminal of the first unidirectional thyristor TR1 is connected to the first input terminal of the energy storage output terminal via the first current limiting resistor R1; the first terminal of the second unidirectional thyristor TR2 is connected to the second terminal of the second energy storage capacitor C2, and the second terminal of the second unidirectional thyristor TR2 is connected to the second input terminal of the energy storage output terminal via the second current limiting resistor R2; the control terminals of the first unidirectional thyristor TR1 and the second unidirectional thyristor TR2 are respectively used to receive trigger enable signals provided by an external control system.

[0015] The energy storage output terminal includes a first pulse capacitor C and a second pulse capacitor D; The first terminal of the first pulse capacitor C is connected to one terminal of the first current-limiting resistor R1, the second terminal of the first pulse capacitor C is connected to the common midpoint and the first terminal of the second pulse capacitor D, and the second terminal of the second pulse capacitor D is connected to one terminal of the second current-limiting resistor R2; the first pulse capacitor C and the second pulse capacitor D are used to discharge in series after charging is completed to provide pulsed electrical energy to the magnetic stimulation coil.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention employs power frequency voltage multiplication technology, where all power devices operate at the power frequency, eliminating high-frequency switching actions and the steep voltage and current spikes generated during high-frequency switching. This eliminates electromagnetic interference at the source, resulting in extremely low electromagnetic radiation and conducted interference. It eliminates the need for additional complex multi-stage filter circuits and metal shielding structures, thereby significantly simplifying system design and shortening the product electromagnetic compatibility certification cycle.

[0017] 2. This invention eliminates the high-frequency transformer, numerous switching transistors, and magnetic devices required in traditional high-frequency switching power supply topologies. High-voltage output can be achieved using only a few components such as rectifier diodes, energy storage capacitors, and thyristors. The number of power devices is greatly reduced, the hardware architecture is simple, the overall cost is significantly reduced, and the number of failure points is reduced, thus lowering the difficulty and cost of later maintenance.

[0018] 3. This invention eliminates the need for bulky power frequency transformers or high frequency transformers, as well as complex filtering circuits and heat dissipation systems. The size and weight of the high voltage generating module are significantly reduced, which is beneficial for the miniaturization and lightweight design of the magnetic stimulator, in line with the trend of portability. Attached Figure Description

[0019] Figure 1 This is a flowchart illustrating the novel power topology control method for a transcranial magnetic stimulation device according to the present invention. Figure 2 This is a schematic diagram of the novel power supply topology control system for a transcranial magnetic stimulation device according to the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example: Figures 1-2 As shown, the present invention provides a technical solution for a novel power supply topology control system and method for a transcranial magnetic stimulation (TMS) device. Using a 220V / 50Hz AC power input, the implementation process of the novel power topology control method for a transcranial magnetic stimulator provided by this invention is described in detail.

[0022] The methods include: Step S1: Obtain the stimulation intensity level, convert the stimulation intensity level into a target charging voltage value based on the linear correspondence between the stimulation intensity level and the pulse capacitor voltage; and calculate the target trigger phase angle corresponding to the target charging voltage value based on the correspondence between the capacitor charging voltage and the trigger phase angle. Step S1-1: Define the stimulus intensity level P as ranging from 0 to 100, and define the maximum peak voltage U of a single pulse capacitor. max The voltage is 620V; the controller obtains the current stimulation intensity level P set by the user, which is set to level 50; the controller calculates the target charging voltage U of a single pulse capacitor according to the linear correspondence between the stimulation intensity level and the pulse capacitor voltage. target =((PP min ) / (P max -P min ))×U max =((50-0) / (100-0))×620V=310V; where, the target charging voltage for level 0 is 0V and the target charging voltage for level 100 is 620V. Step S1-2: The controller calculates the value of the target charging voltage U based on the relationship between the capacitor charging voltage and the trigger phase angle. target =310V corresponds to the target trigger phase angle α; the capacitor charging voltage and the trigger phase angle satisfy the following relationship: Utarget =U max ×(1+cosα) / 2; Reverse transformation of the above formula: α=arccos(2U target / U max -1)=arccos(2×310 / 620-1)=arccos(0)=90°; Thus, the target triggering phase angle α is 90°.

[0023] Step S2: Obtain the zero-crossing synchronization signal of the power frequency AC power supply, start timing at the zero-crossing moment of each power frequency half-cycle, calculate the delayed trigger time based on the half-cycle duration of the power frequency AC power supply and the target trigger phase angle, and when the real-time timing duration reaches the delayed trigger time, generate a trigger enable signal with a fixed pulse width and maintain the output until the current half-cycle ends. Step S2-1: The controller obtains the zero-crossing synchronization signal of the power frequency AC power supply through the hardware zero-crossing detection circuit, and identifies the zero-crossing time of each half-cycle of the power frequency according to the zero-crossing synchronization signal; the zero-crossing time includes the zero-crossing time of the positive half-cycle and the zero-crossing time of the negative half-cycle, which are 180° out of phase; for a 50Hz power frequency AC power supply, the time interval between the zero-crossing time of the positive half-cycle and the zero-crossing time of the negative half-cycle is 10ms. Step S2-2: The controller uses the zero-crossing moment of the current half-cycle of the power frequency as the timing reference point, and calculates the timing based on the half-cycle duration T of the power frequency AC power supply. half =10ms and the target trigger phase angle α=90° obtained in step S1-2, calculate the delay trigger time t of the current power frequency half cycle. delay =T half ×α / α max =10ms×(90°) / (180°)=5ms; that is, the controller outputs the trigger enable signal 5ms after a delay at the zero crossing moment; Step S2-3: The controller starts the on-chip timer at the zero-crossing moment of the current half-cycle of the power frequency. When the real-time timing duration reaches the delay trigger time t... delay At 5ms, a fixed-width trigger enable signal is generated and output to the gate of the corresponding unidirectional thyristor until the end of the current power frequency half-cycle. After the end of the current power frequency half-cycle, since the thyristor is a semi-controlled device, the trigger enable signal will automatically terminate after the anode current crosses zero.

[0024] Step S3: At the end of the energy transfer in each power frequency charging cycle, collect the current voltage feedback value of the DC energy storage terminal and compare the current voltage feedback value with the target charging voltage value; Step S3-1: The controller obtains the voltage sampling signal across the DC energy storage terminal, i.e., the pulse capacitor, through a resistor divider isolation sampling circuit. The voltage sampling signal is then proportionally converted and filtered to obtain the current voltage feedback value V. fbAfter the first power frequency charging cycle ends, the controller acquires the current voltage feedback value V. fb =280V; Step S3-2: The controller detects the end time of energy transfer in the current power frequency charging cycle; the end time of energy transfer is the time when the trigger enable signal of the last power frequency half cycle in the current power frequency charging cycle terminates. Step S3-3: At the end of energy transfer, the controller sends the current voltage feedback value V. fb =280V and the target charging voltage value U calculated in step S1-1 target =310V for comparison; since V fb =280V less than U target =310V, the charging of the DC energy storage terminal is not yet complete in the current power frequency charging cycle, and the controller continues to execute the charging control of the next power frequency charging cycle; after multiple power frequency charging cycles, the voltage of the DC energy storage terminal gradually increases; after 5 power frequency charging cycles, the controller collects the current voltage feedback value V. fb =315V, at this time V fb ≥U target The controller determines that the charging of the DC energy storage terminal has been completed within the current power frequency charging cycle.

[0025] Step S4: If the current voltage feedback value meets the preset charging standard determination condition, then the charging is determined to be complete, and the generation of the trigger enable signal for all subsequent half-cycles of the power frequency is immediately stopped, so that the charging process is naturally cut off and the system enters the standby state. Step S4-1: After the controller determines that charging is complete, it immediately stops generating trigger enable signals for all subsequent half-cycles of the power frequency, so that no triggering action is generated in each half-cycle of the power frequency. Step S4-2: After the current half-cycle of the power frequency ends, the output trigger enable signal will automatically terminate; since the controller has stopped outputting trigger pulses, the thyristors will remain off in all subsequent half-cycles of the power frequency, each power branch will be turned off naturally, the main charging circuit will be completely disconnected, the DC energy storage terminal voltage will stop rising, and the charging process will be terminated. Step S4-3: The controller enters standby mode; in standby mode, the controller retains the voltage sampling and monitoring function of the DC energy storage terminal and the external command detection function, does not perform active charging operation, and waits for subsequent discharge trigger signal or new stimulation intensity adjustment command.

[0026] Step S5: When the stimulation intensity level changes, immediately interrupt the current control parameters, jump to step S1 to recalculate the new target trigger phase angle, and from the zero crossing moment of the next power frequency charging cycle, execute steps S2 to S4 according to the updated control parameters to achieve smooth transition adjustment of the output voltage. Step S5-1: The controller monitors the stimulus intensity level in real time; when the user adjusts the stimulus intensity level from level 50 to level 80, the controller detects that the current stimulus intensity level P has changed and immediately interrupts the currently executing control parameters.

[0027] Step S5-2: The controller jumps to step S1 to obtain the changed stimulus intensity level P. a =Level 80, recalculate the new target charging voltage value U according to step S1-1. target,a =((P a -P min ) / (P max -P min ))×U max =((80-0) / (100-0))×620V=496V; and recalculate the new target trigger phase angle α according to step S1-2. a =arccos(2U target,a / U max -1)=arccos((2×496) / 620-1)=arccos(0.6)≈53.13°; Step S5-3: The controller maintains its original triggering action within the current power frequency charging cycle, that is, it still executes according to the triggering angle of 90° corresponding to level 50. After the current power frequency charging cycle ends, starting from the zero-crossing moment of the next power frequency charging cycle, it will execute according to the updated target triggering phase angle α. a When the angle is approximately 53.13°, proceed with steps S2 to S4 to begin a new round of charging for the DC energy storage terminal. As the trigger angle decreases from 90° to 53.13°, the thyristor turns on earlier, increasing the energy charged into the DC energy storage terminal within each half-cycle of the power frequency. The output voltage smoothly rises from the current value to the target voltage value corresponding to level 80, achieving a smooth transition adjustment of the output voltage.

[0028] The system includes: an industrial frequency AC power input terminal, a first-stage voltage multiplier rectifier unit, a second-stage thyristor voltage regulation and control unit, and an energy storage output terminal; The power frequency AC power input terminal is connected to the first-stage voltage multiplier rectifier unit for connecting to power frequency AC power; The first-stage voltage multiplier rectifier unit is connected to the second-stage thyristor voltage regulation control unit, which is used to convert the power frequency AC power into high-voltage DC bus voltage; The second-stage thyristor voltage regulation control unit is connected to the energy storage output terminal and is used to perform phase control voltage regulation on the high-voltage DC bus voltage and then output it to the energy storage output terminal. The energy storage output terminal is used to store electrical energy to supply the magnetic stimulation coil for discharge.

[0029] The first-stage voltage multiplier rectifier unit includes a first rectifier diode D1, a second rectifier diode D2, a first energy storage capacitor C1, and a second energy storage capacitor C2; The first end of the power frequency AC power input terminal is connected to the anode of the first rectifier diode D1 and the cathode of the second rectifier diode D2, respectively. The second end of the power frequency AC power input terminal is connected to the second end of the first energy storage capacitor C1 and the first end of the second energy storage capacitor C2, respectively. The second end of the first energy storage capacitor C1 and the first end of the second energy storage capacitor C2 are connected and form a common midpoint. The cathode of the first rectifier diode D1 is connected to the first end of the first energy storage capacitor C1, and the anode of the second rectifier diode D2 is connected to the second end of the second energy storage capacitor C2.

[0030] The second-stage thyristor voltage regulation control unit includes a first unidirectional thyristor TR1, a second unidirectional thyristor TR2, a first current-limiting resistor R1, and a second current-limiting resistor R2. The first terminal of the first unidirectional thyristor TR1 is connected to the first terminal of the first energy storage capacitor C1, and the second terminal of the first unidirectional thyristor TR1 is connected to the first input terminal of the energy storage output terminal via the first current limiting resistor R1; the first terminal of the second unidirectional thyristor TR2 is connected to the second terminal of the second energy storage capacitor C2, and the second terminal of the second unidirectional thyristor TR2 is connected to the second input terminal of the energy storage output terminal via the second current limiting resistor R2; the control terminals of the first unidirectional thyristor TR1 and the second unidirectional thyristor TR2 are respectively used to receive trigger enable signals provided by an external control system.

[0031] The energy storage output terminal includes a first pulse capacitor C and a second pulse capacitor D; The first terminal of the first pulse capacitor C is connected to one terminal of the first current-limiting resistor R1, the second terminal of the first pulse capacitor C is connected to the common midpoint and the first terminal of the second pulse capacitor D, and the second terminal of the second pulse capacitor D is connected to one terminal of the second current-limiting resistor R2; the first pulse capacitor C and the second pulse capacitor D are used to discharge in series after charging is completed to provide pulsed electrical energy to the magnetic stimulation coil.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A novel power supply topology control method for transcranial magnetic stimulation (TMS) devices, characterized in that: Includes the following steps: The stimulation intensity level is obtained, and the target charging voltage value is converted according to the linear correspondence between the stimulation intensity level and the pulse capacitor voltage. The target trigger phase angle is then calculated by reverse calculation based on the correspondence between the capacitor charging voltage and the trigger phase angle. Timing starts at the zero-crossing moment of each half-cycle of the power frequency. The delayed trigger time is calculated based on the half-cycle duration of the power frequency and the target trigger phase angle. When the timing reaches the delayed trigger time, a trigger enable signal with a fixed pulse width is generated and maintained until the end of the current half-cycle. At the end of each power frequency charging cycle, the current voltage feedback value of the DC energy storage terminal is collected and compared with the target charging voltage value. If the current voltage feedback value meets the preset charging standard determination condition, then the charging is determined to be complete, the generation of the trigger enable signal for all subsequent half-cycles of the power frequency stops, and the charging process is naturally cut off and enters the standby holding state. When the stimulation intensity level changes, the current control parameters are interrupted, the new target trigger phase angle is recalculated, and charging control is performed according to the updated control parameters starting from the zero-crossing moment of the next power frequency charging cycle.

2. The novel power supply topology control method for a transcranial magnetic stimulation device according to claim 1, characterized in that: The reverse calculation of the target trigger phase angle includes: The system obtains the minimum and maximum values ​​of the stimulation intensity level and the maximum peak voltage of a single pulse capacitor. It then obtains the current stimulation intensity level and calculates the target charging voltage value of a single pulse capacitor based on the linear correspondence between the stimulation intensity level and the pulse capacitor voltage. The minimum stimulation intensity level corresponds to a target charging voltage of zero, and the maximum stimulation intensity level corresponds to a target charging voltage of the maximum peak voltage. Based on the correspondence between the capacitor charging voltage and the trigger phase angle, it calculates the target trigger phase angle corresponding to the target charging voltage value. The minimum trigger phase angle corresponds to the maximum output voltage, and the maximum trigger phase angle corresponds to the minimum output voltage.

3. The novel power supply topology control method for a transcranial magnetic stimulation device according to claim 1, characterized in that: The calculation of the delayed trigger time based on the power frequency half-cycle duration and the target trigger phase angle includes: The zero-crossing synchronization signal of the power frequency AC power supply is acquired. The zero-crossing time of each half-cycle of the power frequency is identified based on the zero-crossing synchronization signal. The zero-crossing time includes the zero-crossing time of the positive half-cycle and the zero-crossing time of the negative half-cycle, which are 180° out of phase. Using the zero-crossing time of the current half-cycle of the power frequency as the timing reference point, the delayed trigger time of the current half-cycle is calculated based on the duration of the half-cycle and the target trigger phase angle. The larger the target trigger phase angle, the longer the delayed trigger time; the smaller the target trigger phase angle, the shorter the delayed trigger time. Timing is started at the zero-crossing time of the current half-cycle. When the timing duration reaches the delayed trigger time, a fixed-width trigger enable signal is generated and output until the current half-cycle ends. The trigger enable signal automatically terminates after the current half-cycle ends.

4. The novel power supply topology control method for a transcranial magnetic stimulation device according to claim 1, characterized in that: The step of collecting the current voltage feedback value of the DC energy storage terminal and comparing it with the target charging voltage value includes: The voltage sampling signal of the DC energy storage terminal is obtained by resistor voltage divider isolation sampling. The voltage sampling signal is proportionally converted and filtered to obtain the current voltage feedback value. The end time of energy transmission in the current power frequency charging cycle is detected. The end time of energy transmission is the time when the trigger enable signal of the last power frequency half cycle in the current power frequency charging cycle terminates. At the end time of energy transmission, the current voltage feedback value is compared with the target charging voltage value. If the current voltage feedback value is greater than or equal to the target charging voltage value, it is determined that the charging of the DC energy storage terminal in the current power frequency charging cycle has been completed.

5. The novel power supply topology control method for a transcranial magnetic stimulation device according to claim 1, characterized in that: The trigger enable signal for stopping the generation of all subsequent power frequency half-cycles includes: Immediately stop generating trigger enable signals for all subsequent power frequency half-cycles, so that no triggering action is generated within each power frequency half-cycle; after the current power frequency half-cycle ends, the output trigger enable signals automatically terminate, the charging main circuit is completely disconnected, the DC energy storage terminal voltage stops rising, and the charging process ends; enter standby holding state, in which the voltage sampling and monitoring function of the DC energy storage terminal and the external command detection function are retained, and active charging operation is not performed.

6. The novel power supply topology control method for a transcranial magnetic stimulation device according to claim 1, characterized in that: The step of performing charging control according to the updated control parameters includes: The system monitors the stimulus intensity level in real time. When a change in the current stimulus intensity level is detected, the currently executing control parameters are immediately interrupted. The steps of acquiring the stimulus intensity level, converting it into a target charging voltage value, and recalculating the target trigger phase angle are re-executed. The changed stimulus intensity level is acquired, and the new target charging voltage value is recalculated according to the linear correspondence. The new target trigger phase angle is also recalculated according to the correspondence between the capacitor charging voltage and the trigger phase angle. The original triggering action remains unchanged within the current power frequency charging cycle. After the current power frequency charging cycle ends, starting from the zero-crossing moment of the next power frequency charging cycle, subsequent charging control is executed according to the updated new target trigger phase angle.

7. A novel power topology control system for a transcranial magnetic stimulation (TMS) device, used to execute the novel power topology control method for a TMS device according to any one of claims 1-6, characterized in that: The system includes: The system includes an AC power input terminal, a first-stage voltage multiplier rectifier unit, a second-stage thyristor voltage regulation control unit, and an energy storage output terminal. The power frequency AC power input terminal is connected to the first-stage voltage multiplier rectifier unit for connecting to power frequency AC power; The first-stage voltage multiplier rectifier unit is connected to the second-stage thyristor voltage regulation control unit, which is used to convert the power frequency AC power into high-voltage DC bus voltage; The second-stage thyristor voltage regulation control unit is connected to the energy storage output terminal and is used to perform phase control voltage regulation on the high-voltage DC bus voltage and then output it to the energy storage output terminal. The energy storage output terminal is used to store electrical energy to supply the magnetic stimulation coil for discharge.

8. The novel power supply topology control system for a transcranial magnetic stimulation device according to claim 7, characterized in that: The first-stage voltage multiplier rectifier unit includes a first rectifier diode D1, a second rectifier diode D2, a first energy storage capacitor C1, and a second energy storage capacitor C2; The first end of the power frequency AC power input terminal is connected to the anode of the first rectifier diode D1 and the cathode of the second rectifier diode D2, respectively. The second end of the power frequency AC power input terminal is connected to the second end of the first energy storage capacitor C1 and the first end of the second energy storage capacitor C2, respectively. The second end of the first energy storage capacitor C1 and the first end of the second energy storage capacitor C2 are connected and form a common midpoint. The cathode of the first rectifier diode D1 is connected to the first end of the first energy storage capacitor C1, and the anode of the second rectifier diode D2 is connected to the second end of the second energy storage capacitor C2.

9. The novel power supply topology control system for a transcranial magnetic stimulation device according to claim 7, characterized in that: The second-stage thyristor voltage regulation control unit includes a first unidirectional thyristor TR1, a second unidirectional thyristor TR2, a first current-limiting resistor R1, and a second current-limiting resistor R2; The first terminal of the first unidirectional thyristor TR1 is connected to the first terminal of the first energy storage capacitor C1, and the second terminal of the first unidirectional thyristor TR1 is connected to the first input terminal of the energy storage output terminal via the first current limiting resistor R1; the first terminal of the second unidirectional thyristor TR2 is connected to the second terminal of the second energy storage capacitor C2, and the second terminal of the second unidirectional thyristor TR2 is connected to the second input terminal of the energy storage output terminal via the second current limiting resistor R2; the control terminals of the first unidirectional thyristor TR1 and the second unidirectional thyristor TR2 are respectively used to receive trigger enable signals provided by an external control system.

10. The novel power supply topology control system for a transcranial magnetic stimulation device according to claim 7, characterized in that: The energy storage output terminal includes a first pulse capacitor C and a second pulse capacitor D. The first terminal of the first pulse capacitor C is connected to one terminal of the first current-limiting resistor R1, the second terminal of the first pulse capacitor C is connected to the common midpoint and the first terminal of the second pulse capacitor D, and the second terminal of the second pulse capacitor D is connected to one terminal of the second current-limiting resistor R2; the first pulse capacitor C and the second pulse capacitor D are used to discharge in series after charging is completed to provide pulsed electrical energy to the magnetic stimulation coil.

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