AED high-voltage power supply system based on LLC resonant conversion and voltage multiplication integration and control method

Abstract

The application discloses an AED high-voltage power supply system and a control method based on LLC resonant conversion and voltage multiplication integration, which comprises a main controller module, an LLC-voltage multiplication power supply module and a switch control module. The main controller module interacts with the LLC-voltage multiplication power supply and the switch control module and receives voltage and current feedback signals. The LLC-voltage multiplication power supply module adopts a topology of cascading a resonant conversion unit and a Cockcroft-Walton voltage multiplier, cooperates with a Core-in-Board planar transformer, and replaces a scheme of a traditional transformer and a flyback topology plus high-voltage rectification. Leakage inductance of the planar transformer is utilized for resonance, and extra resonant inductance of the LLC is removed. In combination with a soft start and a constant-current-constant-voltage phased control strategy, stress of a switch tube is reduced. A resonant cavity transmits energy in a sinusoidal wave, realizes full-process zero-voltage switching (ZVS) of a primary MOSFET, and reduces switch loss. The low-turn primary side (3T) of the planar transformer and the design of the Faraday shielding layer reduce copper loss and EMI electromagnetic interference, improve power conversion efficiency, system integration and defibrillation reliability.

Description

Technical Field

[0001] This invention relates to the field of power control technology, specifically to an AED high-voltage power supply system and control method based on LLC resonant transformation and voltage multiplier integration. Background Technology

[0002] An automated external defibrillator (AED) is a portable medical device used to resuscitate patients experiencing cardiac arrest. One of its core functions is to convert low-voltage battery energy into high-voltage pulses (typically 1500V~2500V, 50J~200J), which are applied to the patient's chest via electrode pads to restore a normal heart rhythm. The high-voltage power module is one of the largest, heaviest, and most expensive subsystems in an AED, directly determining its portability and reliability.

[0003] Currently, most mainstream AEDs on the market use single-ended flyback power supplies. Their transformers store energy when the primary-side switching transistor is on and release it through the secondary side when off, utilizing only half the wave. This results in relatively low energy conversion efficiency. The switching transistor also bears high-voltage stress, including reflected voltage and leakage inductance spikes. Furthermore, the transformers are relatively large, typically using E22-E32 magnetic cores and requiring an air gap, leading to low core utilization. These issues affect the size, weight, and power supply capacity of the AED device, thus limiting the charging current of the defibrillator's energy storage capacitor and increasing the time required to fully charge it. Clinically, a charging time of 5-8 seconds is generally considered acceptable. However, for patients awaiting emergency care, a shorter charging time increases the success rate of defibrillation. Summary of the Invention

[0004] To address the aforementioned technical problems, this paper provides an AED high-voltage power supply system and control method based on LLC resonant transformation and voltage multiplier integration. This technical solution solves the problems mentioned in the background technology, such as the energy stored by the primary-side switch of the transformer when it is turned on, and the energy released through the secondary side when it is turned off, resulting in only half-wave utilization, low energy conversion efficiency, the switch also bearing high voltage stress, including reflected voltage and leakage inductance spikes, large transformer size, the use of E22 to E32 magnetic cores, the need for an air gap, and low core utilization.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A high-voltage power supply system for AED based on LLC resonant converter and voltage multiplier integration includes a main controller module, an LLC-voltage multiplier power supply module and a switching control module. The main controller module interacts with the LLC-voltage doubler power supply module and the switch control module to receive feedback signals of current and voltage, obtain the corresponding target defibrillation energy information based on the target defibrillation command, obtain the target charging voltage and target charging current based on the target defibrillation energy, and then control the capacitor charging, defibrillation discharge and passive discharge states according to the capacitor state. The LLC-voltage multiplier power supply module includes an LLC topology half-bridge / full-bridge resonant transformer unit, a planar transformer unit, a voltage multiplier unit, an energy storage unit, a current detection circuit, and a high-voltage detection circuit; The switch control module includes a switch control circuit, a defibrillation discharge circuit, and a discharge circuit. The switch control circuit is used to control the conduction of the defibrillation discharge circuit and the discharge circuit. The defibrillation discharge circuit is used to release defibrillation energy, and the discharge circuit is used to passively discharge the energy storage capacitor.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention proposes a control method for AED high-voltage power supply systems based on LLC resonant converter and voltage multiplier integration. It utilizes a power topology of cascaded half-bridge / full-bridge LLC resonant converter units and Cockcroft-Walton voltage multipliers, coupled with a core-in-board planar transformer, to replace the traditional transformer and single-ended flyback high-voltage full-wave / bridge rectification scheme. The method leverages the designed leakage inductance of the transformer for resonance, eliminating the resonant inductance required by traditional LLC converters, thus reducing the voltage stress on the switching transistors. The LLC resonant converter uses the sinusoidal wave of the resonant cavity to transmit energy, achieving primary-side M... OSFET zero-voltage switching (ZVS) reduces switching losses; the low-turns primary side (3T) and Faraday shielding design of the planar transformer reduce copper losses and EMI electromagnetic interference, improving power conversion efficiency and system integration; through a three-stage segmented control strategy of soft-start, constant current charging, and constant voltage charging, combined with a frequency regulation mechanism for current and voltage correction, continuous and precise control of charging current and terminal voltage is achieved, providing a control basis for shortening the charging time of the energy storage capacitor and ensuring a stable charging process, thus ensuring the reliability of defibrillation energy output and the safety of equipment operation. Attached Figure Description

[0007] Figure 1 This is a block diagram of the AED high-voltage power supply system based on LLC resonant transformation and voltage multiplier integration proposed in this invention; Figure 2 This is a structural diagram of the planar transformer in this embodiment; Figure 3 This is a flowchart of the AED high-voltage power supply system based on LLC resonant transformation and voltage multiplier integration in this invention. Detailed Implementation

[0008] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0009] Reference Figure 1 As shown, the AED high-voltage power supply system based on LLC resonant conversion and voltage multiplier integration in this embodiment of the invention includes a main controller module, an LLC-voltage multiplier power supply module, and a switch control module. The main controller module includes a main controller, a voltage priority control circuit, a current correction circuit, and a voltage correction circuit; the main controller is used to receive current and voltage feedback signals and interacts with the LLC-voltage doubler power supply module and the switching control module, respectively. The LLC-voltage multiplier power supply module includes an LLC topology half-bridge / full-bridge resonant transformer unit, a planar transformer unit, a voltage multiplier unit, an energy storage unit, a current detection circuit, and a high-voltage detection circuit; The switch control module includes a switch control circuit, a defibrillation discharge circuit, and a discharge circuit. The switch control circuit is used to control the conduction of the defibrillation discharge circuit and the discharge circuit. The defibrillation discharge circuit is used to release defibrillation energy, and the discharge circuit is used to passively discharge the energy storage capacitor.

[0010] In the LLC-voltage multiplier power module, the input terminal of the half-bridge resonant converter unit of the LLC topology is connected to the DC input power supply, and the output terminal of the resonant converter unit is connected to the primary side of the planar transformer unit. The secondary side of the planar transformer unit is connected to the input terminal of the voltage multiplier unit, and the output terminal of the voltage multiplier unit is connected to the energy storage capacitor of the energy storage unit. The current detection circuit is connected in series in the resonant circuit of the resonant converter unit to sample the real-time charging current signal and feed it back to the main controller module. The high-voltage detection circuit is connected in parallel to the energy storage capacitor. Both ends are used for sampling the energy storage capacitor. The real-time terminal voltage signal is fed back to the main controller module.

[0011] The main controller module specifically includes: The main controller integrates an STM32F429IIT6 chip, which is used to obtain the corresponding target defibrillation energy information based on the target defibrillation command, obtain the target charging voltage and target charging current based on the target defibrillation energy, and control the capacitor charging mode and defibrillation discharge or passive discharge after full charge according to the capacitor state. The priority control circuit has two input terminals connected to the current frequency adjustment signal output after current correction and the voltage frequency adjustment signal output after voltage correction, respectively. Its output terminal is connected to the RT frequency control terminal of the resonant converter unit, which is used to select the effective control signal from the two signals for output, so as to realize the frequency segmentation control during the charging process. The current correction circuit is electrically connected to the current detection circuit to receive the real-time charging current signal input and references the target charging current set by the main controller at another input terminal. After correction, it outputs a current frequency adjustment signal. The voltage correction circuit has its sampling input terminal electrically connected to the high voltage detection circuit. It receives the real-time terminal voltage signal input and references the target charging voltage set by the main controller at another input terminal. After correction, it outputs a voltage frequency adjustment signal.

[0012] The resonant converter unit consists of a resonant controller UCC25600, a gate drive circuit, and an LLC resonant circuit. The two drive outputs GD1 and GD2 of the resonant controller UCC25600 are connected to the power switching transistors via gate driver T1. With power switching transistors The gate of the bridge forms a half-bridge drive; The gate drive transformer T1 is a simple and reliable driving solution, as it requires no drive power supply or latch-up and can prevent breakdown due to transformer coupling. Of course, using a traditional driver chip to drive the MOSFET switch is another viable driving solution.

[0013] The LLC resonant circuit consists of a power switch transistor. The drain is electrically connected to the positive terminal of the DC input power supply, and the source is connected to the power switch transistor. The drain electrical connection of the power switch transistor The source of the transistor is electrically connected to the negative terminal of the DC input power supply, while the power switching transistor... and The connection point is successively connected to the primary winding of the planar transformer unit and the resonant capacitor. Electrically connected to the negative terminal of the DC input power supply, forming an LLC half-bridge resonant circuit; It is understandable that, for this solution, the LLC resonant circuit is not limited to a half-bridge topology; a full-bridge topology can also be selected depending on specific requirements.

[0014] The complete equivalent model corresponding to the primary winding of the planar transformer unit includes series leakage inductance. and parallel excitation inductor This, together with an ideal transformer, constitutes the whole; The RT frequency control terminal of the resonant controller is connected to the output terminal of the priority control circuit, and adjusts the half-bridge power switching transistors in real time according to the input control signal. , By adjusting the switching frequency, the voltage gain of the LLC resonant network can be changed, thereby achieving continuous control over the output voltage and charging current of the subsequent stage. In addition, by adjusting the SS, OC and DT terminals of the resonant controller, the power module can achieve functions such as soft start, overcurrent protection, overtemperature protection and dead time adjustment.

[0015] Reference Figure 2 As shown, the planar transformer unit integrates a planar transformer. It uses E16 / 4.8 / 5.2 (3F45 ferrite) cores, with a 3-turn primary winding located on the top layer (L1) of the PCB. The secondary winding has 96 turns, distributed across eight inner layers (L3-L10) of the PCB, with 12 turns in series on each layer, resulting in a turns ratio of 1:32. The overall design employs a core-in-board embedded PCB structure, with through-holes in the transformer area of ​​the main PCB for the E16 core's center post to pass through. The transformer area is partially stacked to a 10-layer PCB (2.0mm thick), while the remaining areas of the main PCB maintain 6 layers (1.6mm thick). The 10-layer area and the 6-layer area are interconnected and transitioned between layers through stepped copper foil. Its primary winding is directly connected to the LLC resonant network, eliminating the need for an additional resonant inductor in traditional LLC resonant circuits. Instead, it directly utilizes the leakage inductance designed by the planar transformer to resonate, proportionally boosting the high-frequency AC voltage output from the resonant transformer unit and coupling it to the secondary winding. The secondary winding outputs a high-frequency AC voltage to the voltage multiplier unit, providing a high-frequency AC input with matching amplitude for the voltage multiplier unit.

[0016] The voltage multiplier unit integrates a Cockcroft-Walton voltage multiplier. In this embodiment, the DC input power is 12V. Because the LLC resonant circuit uses a half-bridge topology, the voltage multiplier is designed as a 4-stage structure, requiring 8 voltage multiplier capacitors, all of which are C0G / NP0 temperature-compensated ceramic capacitors, and 8 ultra-fast recovery rectifier diodes. Each stage has a voltage multiplication factor of 2, and its theoretical output voltage is approximately 1952V, which is exactly 8 times the peak voltage of the transformer secondary side (244V). Considering the voltage drop of approximately 100V under full load, the voltage drop is compensated by LLC frequency modulation, ultimately achieving an output voltage of around 2000V.

[0017] The Cockcroft-Walton voltage multiplier consists of a first voltage multiplier capacitor. Second voltage multiplier capacitor Third voltage multiplier capacitor Fourth voltage multiplier capacitor and the first rectifier diode Second rectifier diode Third rectifier diode Fourth rectifier diode Cascaded configuration.

[0018] The planar transformer One end of the secondary winding is electrically connected to the first voltage multiplier capacitor. One end, the first voltage multiplier capacitor The other end is connected to the first rectifier diode. cathode and second rectifier diode The anode electrical connection, the first rectifier diode The anode is electrically connected to the second voltage multiplier capacitor. One end, the second voltage multiplier capacitor The other end is connected to the planar transformer The secondary winding is electrically connected and grounded; Second rectifier diode The anode is connected to the third voltage multiplier capacitor. One end, the third voltage multiplier capacitor The other end is connected to the third rectifier diode. The cathode is electrically connected to the third rectifier diode. The anode is electrically connected to the fourth voltage multiplier capacitor. One end, the fourth rectifier diode anode and third rectifier diode The cathode is electrically connected to the fourth rectifier diode. Cathode and fourth voltage multiplier capacitor The other end is electrically connected, and so on. A basic voltage multiplier group is composed of two rectifier diodes and two voltage multiplier capacitors. Based on the voltage multiplier level, a corresponding number of basic voltage multiplier groups are selected for cascading.

[0019] Understandably, the resonant transformer unit, planar transformer unit, and voltage multiplier unit can be flexibly designed and adjusted according to actual applications and customer requirements. If the resonant transformer unit uses a full-bridge LLC topology while keeping the input DC power supply and planar transformer unit unchanged, the voltage multiplier unit can be reduced from 8 times to 4 times the voltage under the original half-bridge topology design. Similarly, if the input DC power supply and the half-bridge topology of the resonant transformer unit remain unchanged, increasing the turns ratio of the secondary and primary sides of the planar transformer can also reduce the number of voltage multiplier stages.

[0020] The energy storage unit integrates energy storage capacitors. It is used to receive the high-voltage DC output from the voltage multiplier unit and store defibrillation energy in the form of electric field energy. During the charging process, the voltage at its two ends gradually increases until it reaches the release threshold corresponding to the target defibrillation energy.

[0021] LLC voltage multiplier modules also include: High-voltage detection circuit, the high-voltage detection circuit consists of a first voltage divider resistor With the second voltage divider resistor Series connection, parallel connection to energy storage capacitor It is connected to both ends and electrically to the voltage correction circuit of the main controller module, for real-time sampling of the terminal voltage of the energy storage capacitor and transmission to the main controller module; Current detection circuit, wherein the current detection circuit integrates a sampling resistor The sampling resistor It is electrically connected to the current correction circuit of the main controller module and connected in series with the resonant converter unit to obtain the real-time charging current and transmit it to the main controller module.

[0022] Reference Figure 3 As shown, further, combining the above-mentioned AED high-voltage power supply system based on LLC resonant transformation and voltage multiplier integration, a control method for the AED high-voltage power supply system based on LLC resonant transformation and voltage multiplier integration is proposed, including: After the system is powered on and initialized, the main controller receives the target defibrillation command, obtains the target defibrillation energy information and the capacitance parameter of the energy storage capacitor, and calculates the target charging voltage and the target charging current. The resonant converter performs a soft start with a preset initial high frequency value, gradually reduces the operating frequency to the resonant frequency, suppresses the current surge at the moment of startup, and enters the constant current charging stage after the soft start is completed. The current detection circuit samples the charging current in real time and feeds it back to the current correction circuit. The current correction circuit performs deviation correction calculation between the real-time charging current and the target charging current set by the main controller, and then outputs a current frequency adjustment signal. At this time, the voltage at the end of the energy storage capacitor deviates significantly from the target charging voltage. The priority control circuit selects the current frequency adjustment signal and transmits it to the RT terminal of the resonant converter to adjust the operating frequency and stabilize the charging current at the target charging current, thereby performing constant current charging on the energy storage capacitor. As the voltage at the end of the energy storage capacitor continues to rise, when the real-time end voltage reaches the preset constant voltage switching threshold, the voltage frequency adjustment signal output by the voltage correction circuit becomes an effective control signal. The priority control circuit automatically switches to select the voltage frequency adjustment signal to be transmitted to the RT terminal of the resonant converter, and adjusts the operating frequency to stabilize the end voltage of the energy storage capacitor at the target charging voltage. Among them, the charging current, voltage across the energy storage capacitor and system temperature collected in real time during the charging process are used to simultaneously determine whether there are any abnormalities such as overcurrent, overvoltage, overtemperature or charging timeout. If any abnormality occurs, immediately stop the operation of the resonant converter and switch to the passive discharge process; If there are no abnormalities, continue to perform charging control; When the voltage at the end of the energy storage capacitor reaches the release threshold, the main controller outputs a charging ready signal and starts the timeout timer at the same time. If a defibrillation discharge command is received within the preset timeout period, the switch control circuit controls the defibrillation discharge circuit to be turned on, and the energy storage capacitor releases defibrillation energy to the load through the electrodes. If a shutdown command is received or a defibrillation command is not received after a preset timeout period, the switch control circuit activates the discharge circuit to passively discharge the energy storage capacitor until the terminal voltage drops below the safe voltage threshold. In this embodiment, after the main controller receives the defibrillation preparation command, the LLC resonant controller and the voltage multiplier main circuit start working, and simultaneously perform high voltage detection and resonant side current detection at the output. Based on the required defibrillation energy, the main controller sets a defibrillation voltage value Vset and a current value Iset, and combines the outputs of the high voltage detection and current detection to perform real-time correction of the actual required voltage and current.

[0023] In this embodiment, the voltage division ratio is approximately 2001:1. The main controller automatically selects the control signal required for constant current / constant voltage charging by prioritizing the feedback signal from the voltage circuit, thereby controlling the current of the RT pin of the resonant controller.

[0024] The charging sequence follows the following: During the soft start (100ms) phase, the LLC resonant controller gradually reduces the operating frequency from the preset high frequency to the design operating frequency in a soft start manner to limit the start-up inrush current; During the constant current charging (0~3.5s) stage, the charging current is detected by the voltage feedback circuit, and the operating frequency is adjusted so that the half-bridge LLC resonant converter circuit can set the charging current value Iset to charge the energy storage capacitor at a constant current. During the constant voltage charging stage (3.5~4.5s), when the voltage of the energy storage capacitor reaches the set target value Vset, the LLC resonant controller switches to constant voltage control mode and adjusts the operating frequency to stabilize the output voltage at Vset. During the full charge indication phase, when the capacitor voltage reaches the set threshold, a ready signal is sent to the main controller. Through the switch control circuit, the main controller controls the amount of current and energy that passes through the heart during defibrillation to be released to the patient through the electrodes during the defibrillation discharge phase, ensuring the success rate of defibrillation. If the energy storage capacitor automatically discharges energy due to reasons such as timeout, user cancellation, electrode disconnection, or malfunction, the main controller can also control the switching circuit to prevent high voltage residue and accidental discharge, ensuring personnel safety, ensuring that each charge starts from below 25V, preventing abnormal control during recharging, and protecting the lifespan of the energy storage capacitor.

[0025] The voltage correction circuit and current correction circuit can employ P-type, PI-type, or PID-type control circuits. It should be noted that the priority control circuit, switch control circuit, defibrillation circuit, and discharge circuit are conventional circuit designs in the field, and technicians can customize them according to actual needs. In particular, depending on the energy specifications of the AED product, the voltage multiplier can be adjusted between 2 and 6 levels, such as 5 or 6 levels, to meet the higher voltage requirements (2500V~3200V) of some biphasic AEDs. The control method can also be further optimized. For example, during the constant current charging stage, a dynamic frequency scanning mechanism can be introduced, and the overcurrent threshold, overvoltage threshold, overtemperature threshold, and charging timeout can be set according to actual needs. The core of this invention lies in achieving the conversion of DC power to a high-voltage output through a half-bridge LLC resonant converter, a planar transformer, and a Cockcroft-Walton multi-stage voltage multiplier integration. Those skilled in the art can obtain applicable circuit designs without creative effort based on the technical concept of this invention. It is understandable that the target defibrillation energy indicates the energy required to defibrillate the target. The specific value can be set according to the defibrillation level. For example, 150J or 200J (biphasic wave) for adults, and 50J or 70J for children through electrode pad identification or button switching. The target charging voltage is as follows:

[0026] In the formula, Indicates the target charging voltage. Indicates the target defibrillation energy. Indicates energy storage capacitor, Indicates the target charging current. Indicates human body impedance; In this embodiment, the initial high frequency value is 500kHz, and the constant voltage switching threshold is 92% of the release threshold (target charging voltage); for example, when the release threshold of the 200J gear is 2000V, the constant voltage switching threshold is 1840V, and the release threshold is the target charging voltage. The resonant frequency is specifically:

[0027] In the formula, Indicates the resonant frequency. Indicates the resonant leakage inductance value. This indicates the value of the resonant capacitance.

[0028] In summary, the advantages of this invention are as follows: By using a power topology cascaded with a resonant converter unit and a Cockcroft-Walton voltage multiplier, coupled with an E16 Core-in-Board planar transformer, it replaces traditional transformers, single-ended flyback high-voltage circuits, and full-wave / bridge rectification. This eliminates the resonant inductance required by traditional LLC converters, utilizing the transformer's designed leakage inductance for resonance. This achieves improved power conversion efficiency and reduced voltage stress on the switching transistors. The LLC resonant converter achieves zero-voltage switching (ZVS) of the primary-side MOSFETs throughout the entire circuit, and the resonant cavity transmits energy via a sinusoidal wave, eliminating switching losses and EMI issues associated with flyback topologies. The low-turns primary side (3T) of the planar transformer reduces copper losses and improves system efficiency. Through a three-stage segmented control strategy of soft-start, constant-current charging, and constant-voltage charging, combined with a frequency adjustment mechanism for current and voltage correction, continuous and precise control of the charging current and terminal voltage is achieved. This provides a control basis for shortening the charging time of the energy storage capacitor and ensuring a stable charging process, thus ensuring the reliability of defibrillation energy output and the safety of equipment operation.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. An AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration, characterized in that, Includes a main controller module, an LLC-voltage multiplier power supply module, and a switch control module; The main controller module includes a main controller, a voltage priority control circuit, a current correction circuit, and a voltage correction circuit; the main controller is used to receive current and voltage feedback signals and interacts with the LLC-voltage doubler power supply module and the switching control module, respectively. The LLC-voltage multiplier power supply module includes an LLC topology half-bridge / full-bridge resonant transformer unit, a planar transformer unit, a voltage multiplier unit, an energy storage unit, a current detection circuit, and a high-voltage detection circuit; The switch control module includes a switch control circuit, a defibrillation discharge circuit, and a discharge circuit. The switch control circuit is used to control the conduction of the defibrillation discharge circuit and the discharge circuit. The defibrillation discharge circuit is used to release defibrillation energy, and the discharge circuit is used to passively discharge the energy storage capacitor.

2. The AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration according to claim 1, characterized in that, The input terminal of the half-bridge / full-bridge resonant converter unit of the LLC topology in the LLC-voltage multiplier power supply module is connected to the DC input power supply, and the output terminal of the resonant converter unit is connected to the primary side of the planar transformer unit. The secondary side of the planar transformer unit is connected to the input terminal of the voltage multiplier unit, and the output terminal of the voltage multiplier unit is connected to the energy storage capacitor of the energy storage unit. ; The current detection circuit is connected in series in the resonant circuit of the resonant converter unit to sample the real-time charging current signal and feed it back to the main controller module. The high-voltage detection circuit is connected in parallel with the energy storage capacitor. Both ends are used for sampling the energy storage capacitor. The real-time terminal voltage signal is fed back to the main controller module.

3. The AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration according to claim 1, characterized in that, The main controller module specifically includes: The main controller integrates an STM32F429IIT6 chip, which is used to obtain the corresponding target defibrillation energy and human body impedance information based on the target defibrillation command, set the target charging voltage and target charging current based on the target defibrillation energy, and control the capacitor charging mode and defibrillation discharge or passive discharge after full charge according to the real-time status of the capacitor. The priority control circuit has two input terminals connected to the current frequency adjustment signal output after current correction and the voltage frequency adjustment signal output after voltage correction, respectively. Its output terminal is connected to the RT frequency control terminal of the resonant converter unit, which is used to select the effective control signal from the two signals for output, so as to realize the frequency segmentation control during the charging process. The current correction circuit is electrically connected to the current detection circuit to receive the real-time charging current signal input and references the target charging current set by the main controller at another input terminal. After correction, it outputs a current frequency adjustment signal. The voltage correction circuit has its sampling input terminal electrically connected to the high voltage detection circuit. It receives the real-time terminal voltage signal input and references the target charging voltage set by the main controller at another input terminal. After correction, it outputs a voltage frequency adjustment signal.

4. The AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration according to claim 1, characterized in that, The LLC resonant converter unit consists of a resonant controller UCC25600, a gate drive circuit, and an LLC resonant circuit. The gate drive circuit is connected to the power switching transistor via the two drive outputs GD1 and GD2 of the UCC25600 through transformer T1. and power switching transistors The gate of the bridge forms a half-bridge drive; The LLC resonant circuit consists of a power switch transistor. The drain is electrically connected to the positive terminal of the DC input power supply, and the source is connected to the power switch transistor. The drain electrical connection of the power switch transistor The source of the transistor is electrically connected to the negative terminal of the DC input power supply, while the power switching transistor... and The connection point is successively connected to the primary winding of the planar transformer unit and the resonant capacitor. Electrically connected to the negative terminal of the DC input power supply, forming an LLC half-bridge resonant circuit; The complete equivalent model corresponding to the primary winding of the planar transformer unit includes series leakage inductance. and parallel excitation inductor This, together with an ideal transformer, constitutes the whole; The resonant controller UCC25600 is connected to the output of the priority control circuit via the RT frequency control terminal, and adjusts the half-bridge power switching transistors in real time according to the input control signal. , By adjusting the switching frequency, the voltage gain of the LLC resonant circuit is changed, enabling continuous control of the output voltage and charging current of the subsequent stage. By regulating the SS, OC, and DT terminals of the resonant controller, the power module can achieve soft start, overcurrent protection, overtemperature protection, and dead time adjustment functions.

5. The AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration according to claim 1, characterized in that, The planar transformer unit integrates a planar transformer. Its primary winding is directly connected to the LLC resonant circuit. The high-frequency AC voltage is boosted proportionally and coupled to the secondary winding. The secondary winding then outputs a high-frequency AC voltage to the voltage multiplier unit, providing a high-frequency AC input with matching amplitude for the voltage multiplier unit.

6. The AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration according to claim 1, characterized in that, The voltage multiplier unit integrates a Cockcroft-Walton voltage multiplier, consisting of a first voltage multiplier capacitor. Second voltage multiplier capacitor Third voltage multiplier capacitor Fourth voltage multiplier capacitor Fifth voltage multiplier capacitor 6th voltage capacitor 7th voltage multiplier capacitor Eighth voltage multiplier capacitor and the first rectifier diode Second rectifier diode Third rectifier diode Fourth rectifier diode Fifth rectifier diode The sixth rectifier diode 7th rectifier diode Eighth rectifier diode Cascaded configuration.

7. The AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration according to claim 1, characterized in that, The energy storage unit integrates an energy storage capacitor. It is used to receive the high-voltage DC power output from the voltage multiplier unit and store defibrillation energy in the form of electric field energy. During the charging process, the voltage at its two ends gradually increases until it reaches the release threshold corresponding to the target defibrillation energy. If the preset timeout period is exceeded, the energy is passively released.

8. The AED high-voltage power supply system based on LLC resonant converter and voltage multiplier integration according to claim 1, characterized in that, The LLC-voltage multiplier power supply module also includes: High-voltage detection circuit, the high-voltage detection circuit consists of a first voltage divider resistor With the second voltage divider resistor Series connection, parallel connection to energy storage capacitor It is connected to both ends and electrically to the voltage correction circuit of the main controller module, for real-time sampling of the voltage across the energy storage capacitor and transmission to the main controller module; Current detection circuit, wherein the current detection circuit integrates a sampling resistor The sampling resistor It is electrically connected to the current correction circuit of the main controller module and connected in series with the resonant converter unit to obtain the real-time charging current and transmit it to the main controller module.

9. A control method for an AED high-voltage power supply system based on LLC resonant transformation and voltage multiplier integration, used to control the system as described in claims 1-8, characterized in that, include: After the system is powered on and initialized, the main controller receives the target defibrillation command, obtains the target defibrillation energy information and the capacitance parameter of the energy storage capacitor, and calculates the target charging voltage and the target charging current. The resonant converter performs a soft start with a preset initial high frequency value, gradually reduces the operating frequency to the resonant frequency, suppresses the current surge at the moment of startup, and enters the constant current charging stage after the soft start is completed. The current detection circuit samples the charging current in real time and feeds it back to the current correction circuit. The current correction circuit performs deviation correction calculation between the real-time charging current and the target charging current set by the main controller, and then outputs a current frequency adjustment signal. At this time, the voltage at the end of the energy storage capacitor deviates significantly from the target charging voltage. The priority control circuit selects the current frequency adjustment signal and transmits it to the RT terminal of the resonant converter to adjust the operating frequency and stabilize the charging current at the target charging current, thereby performing constant current charging on the energy storage capacitor. As the voltage at the end of the energy storage capacitor continues to rise, when the real-time end voltage reaches the constant voltage switching threshold, the voltage frequency adjustment signal output by the voltage correction circuit becomes an effective control signal. The priority control circuit automatically switches to select the voltage frequency adjustment signal to be transmitted to the RT terminal of the resonant converter, and adjusts the operating frequency to stabilize the end voltage of the energy storage capacitor at the target charging voltage. Among them, the charging current, voltage across the energy storage capacitor and system temperature collected in real time during the charging process are used to simultaneously determine whether there are any abnormalities such as overcurrent, overvoltage, overtemperature or charging timeout. If any abnormality occurs, immediately stop the operation of the resonant converter and switch to the passive discharge process; If there are no abnormalities, continue to perform charging control; When the voltage at the end of the energy storage capacitor reaches the release threshold, the main controller outputs a charging ready signal and starts the timeout timer at the same time. If a defibrillation discharge command is received within the preset timeout period, the switch control circuit controls the defibrillation discharge circuit to be turned on, and the energy storage capacitor releases defibrillation energy to the load through the electrodes. If a shutdown command is received or a defibrillation discharge command is not received after the preset timeout period, the switch control circuit activates the discharge circuit to passively discharge the energy storage capacitor until the terminal voltage drops below the safe voltage threshold.

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