A high efficiency wide input voltage range switching power supply converter control method

Abstract

The application discloses a high-efficiency wide-input-voltage-range switching power supply converter control method, and belongs to the technical field of switching power supply converter control. The application aims to solve the technical problems of low conversion efficiency of a switching power supply converter, inability of soft switching to cover the whole domain, and easy output disturbance caused by mode switching in a wide input voltage fluctuation scene. According to the amplitude relationship between an input voltage and a preset target output voltage, the method adaptively determines a step-down mode, a step-up mode and a step-up / down transition mode; each working mode matches a corresponding soft switching driving mechanism, and the minimum total loss of the working condition is taken as an optimization target, and converter control parameters are generated through an adaptive parameter setting strategy to control the switching power supply converter; and a smooth switching mechanism without disturbance between working modes is configured. The application can realize soft switching operation in the whole input voltage range, improve the conversion efficiency in all working conditions, suppress mode switching fluctuation, and adapt to new energy power generation, industrial power supply and other wide voltage fluctuation scenes.

Description

Technical Field

[0001] This invention relates to the field of switching power supply converter control technology, and specifically to a high-efficiency switching power supply converter control method with a wide input voltage range. Background Technology

[0002] With the rapid development of new energy power generation, vehicle-mounted DC power supply, and industrial wide-voltage power supply, the input voltage of switching power converters often exhibits a wide range of fluctuations, placing stringent requirements on the converter's voltage regulation range, conversion efficiency, and operational stability. While the four-switch Buck-Boost step-up / step-down DC-DC topology possesses wide-range voltage regulation capabilities, traditional control schemes often employ fixed-parameter single-mode control strategies. This fails to match optimal operating parameters based on the input voltage amplitude, resulting in drawbacks such as narrow soft-switching coverage, uneven conversion efficiency across all operating conditions, and easy output voltage disturbances and current surges during mode switching. Consequently, it struggles to simultaneously meet the dual requirements of wide input adaptability and high-efficiency operation, limiting its application effectiveness in complex power supply scenarios.

[0003] Existing technologies, exemplified by Chinese patent publication CN117277787B, disclose a high-voltage, wide-range input power DC-DC converter and its control method. This converter employs a half-bridge drive circuit structure, using a PI control loop to adjust the on-time and switching frequency of the switching transistors to achieve output voltage regulation. It also incorporates auxiliary power supply and electromagnetic compatibility protection modules to enhance system reliability. However, this solution uses a single half-bridge topology and a fixed-parameter control architecture, failing to differentiate operating modes based on the amplitude relationship between input and output voltages, thus hindering smooth transitions between buck and boost conditions. Furthermore, key parameters such as switching frequency and dead time cannot be dynamically adapted to changing operating conditions, making it difficult to achieve reliable soft-switching operation and optimal losses across the entire input voltage range. Additionally, it lacks a seamless switching mechanism between modes, making it prone to output voltage jumps and inductor current surges when the input voltage fluctuates significantly. Overall, its performance under wide-range voltage conditions remains insufficient. Summary of the Invention

[0004] The purpose of this invention is to provide a high-efficiency control method for a switching power supply converter with a wide input voltage range, in order to solve the technical problems mentioned in the background art, such as low conversion efficiency under all operating conditions, difficulty in achieving full-range soft switching, and large output disturbance during mode switching.

[0005] To achieve the above objectives, the present invention provides a high-efficiency switching power supply converter control method with a wide input voltage range, comprising the following steps: S1. Real-time acquisition of the input voltage of the switching power supply converter, and adaptive determination of the operating mode of the switching power supply converter based on the amplitude relationship between the input voltage and the preset target output voltage; S2. Determine the corresponding soft-switching drive mechanism based on the working mode, and combine it with the operating status data of the switching power supply converter. With the goal of minimizing the total loss under the operating condition, generate the converter control parameters by executing an adaptive parameter tuning control strategy. S3. Based on the converter control parameters, control the switching power converter to complete the regulated power conversion over a wide input voltage range.

[0006] Furthermore, the rule for determining the working mode is as follows: When the input voltage is greater than the sum of the preset target output voltage and the preset hysteresis threshold, the operating mode of the switching power supply converter is determined to be buck operating mode. When the input voltage is less than the difference between the preset target output voltage and the preset hysteresis threshold, the operating mode of the switching power supply converter is determined to be boost mode. When the absolute value of the difference between the input voltage and the preset target output voltage is less than or equal to the preset hysteresis threshold, the operating mode of the switching power supply converter is determined to be the buck-boost transition operating mode.

[0007] Furthermore, the soft-switching drive mechanism corresponding to the buck operating mode is a zero-voltage turn-on drive mechanism for the high-voltage side bridge arm switch. By acquiring real-time operating status data of the switching power converter, an adaptive parameter tuning control strategy is executed with the goal of minimizing the total operating loss, generating converter control parameters including the high-voltage side bridge arm duty cycle, switching frequency, bridge arm dead time, and resonant timing offset.

[0008] Furthermore, the soft-switching drive mechanism corresponding to the boost operating mode is a zero-voltage turn-on drive mechanism for the low-voltage side bridge arm switch. By acquiring real-time operating status data of the switching power converter, an adaptive parameter tuning control strategy is executed with the goal of minimizing the total operating loss, generating converter control parameters including the duty cycle of the low-voltage side bridge arm, switching frequency, bridge arm dead time, and resonant timing offset.

[0009] Furthermore, the soft-switching drive mechanism corresponding to the buck-boost transition working mode is a phase-shift resonance zero-voltage turn-on drive mechanism for the full-bridge arm switching transistors. By acquiring real-time operating status data of the switching power converter, an adaptive parameter tuning control strategy is executed with the goal of minimizing the total operating loss, generating converter control parameters including the duty cycle of the front and rear bridge arms, phase shift angle, switching frequency, bridge arm dead time, and resonance timing offset.

[0010] Furthermore, the adaptive parameter tuning control strategy is as follows: S21. Control parameter base value mapping: Based on the current operating mode, input voltage and load current of the switching power supply converter, the offline calibrated full-condition optimal parameter mapping table is called to perform interpolation calculation, and the duty cycle reference value is corrected by combining input voltage feedforward compensation, and the initial control parameter base value is output. S22. Control parameter optimization iteration: Construct a mathematical model of the total loss of the converter under the corresponding working mode, with the minimum total loss under the working condition as the objective function and the soft switching implementation conditions, device rated stress, and output ripple index as constraints. Perform gradient descent iteration optimization on the initial control parameter base value. When the difference between the total loss under the working condition of two adjacent gradient descent iterations is less than the preset convergence threshold, output the theoretically optimal control parameters. S23. Parameter Dynamic Correction Iteration: Collect the real-time operating status feedback of the switching power supply converter, and iteratively correct the soft switching margin, output ripple amplitude and device temperature drift respectively, and dynamically adjust the theoretically optimal control parameters to obtain the converter control parameters.

[0011] Furthermore, the soft-switching drive mechanism calculates the margin by detecting the zero-crossing moment of the drain-source voltage of the switching transistor in real time, and dynamically adjusts the dead time of the bridge arm and the resonant timing offset based on the soft-switching margin to ensure that the switching transistor achieves zero-voltage turn-on in each operating mode.

[0012] Furthermore, the switching power supply converter control method also includes smooth, non-disruptive switching between operating modes. When the input voltage is detected to enter the mode switching hysteresis interval, the converter control parameter tuning calculation for the target operating mode is initiated in advance. When officially switching to the target operating mode, the converter control parameters are subjected to a linear gradual transition to maintain continuous, non-jumping output voltage and inductor current.

[0013] Furthermore, the width of the mode switching hysteresis interval is determined by a preset hysteresis threshold, which is used to suppress frequent operating mode switching caused by small fluctuations in the input voltage.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention divides differentiated operating modes according to the amplitude relationship between the input voltage and the target output voltage and matches corresponding soft-switching drive mechanisms. Through a three-layer progressive iterative adaptive parameter tuning strategy, combined with online optimization of the total loss mathematical model and real-time operating condition feedback to correct the dynamic output optimal control parameters, the present invention achieves reliable operation of full-domain soft switching within the full input voltage range, effectively reducing the conduction loss and switching loss of the converter under various operating conditions, and significantly improving the conversion efficiency across the entire range. At the same time, the present invention is configured with a mode pre-synchronization and linear gradual switching mechanism with hysteresis threshold, which can suppress frequent mode switching caused by small fluctuations in input voltage and eliminate output voltage jumps and inductor current surges during mode switching. It can simultaneously achieve high conversion efficiency and operational stability in wide input voltage fluctuation scenarios. Attached Figure Description

[0015] Figure 1 This is a flowchart of the overall execution steps of the switching power supply converter control method of the present invention; Figure 2 This is a schematic diagram of the three-layer iterative process of the adaptive parameter tuning control strategy of the present invention; Figure 3 This is a diagram of the main power topology of a four-switch buck-boost DC-DC converter according to an embodiment of the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0017] The high-efficiency, wide-input-voltage-range switching power converter control method described in this embodiment is applied to, for example, Figure 3 The diagram shows the main power topology of a four-switch Buck-Boost (FSBB) DC-DC converter. The main power topology includes the input voltage... First high-voltage side switch tube Second high-voltage side switch tube Energy storage inductor (L), first low-voltage side switching transistor Second low-voltage side switch tube Output filter capacitor ;in, and The high-voltage side bridge arm is formed by series connection. and The two bridge arms are connected in series to form the low-voltage side arm. The energy storage inductor (L) is connected between the midpoints of the two bridge arms, and the output filter capacitor is connected in parallel on the output side. and load resistance load resistance The voltage across the terminals is the output voltage of the switching power supply converter. All four switching transistors are power MOSFETs with body diodes and parasitic output capacitance, which can achieve zero-voltage turn-on (ZVS) through resonance.

[0018] The overall execution flow of the switching power supply converter control method in this embodiment is as follows: Figure 1 As shown, it includes operating mode determination, adaptive parameter tuning, and voltage regulation transformation execution, while configuring a smooth, non-disruptive switching mechanism between modes. The following section will combine... Figure 3 A complete description of the specific implementation process of the switching power supply converter control method is provided: S1. Operating Mode Determination: The input voltage of the switching power supply converter is acquired in real time, and the operating mode of the switching power supply converter is adaptively determined based on the amplitude relationship between the input voltage and the preset target output voltage. The specific implementation steps are as follows: Real-time sampling of the input voltage of the switching power converter via a voltage sampling circuit Combined with the preset target output voltage With preset hysteresis threshold The current working mode is adaptively determined based on the amplitude relationship, and the determination rules are as follows: When satisfied When this occurs, it is determined that the switching power converter is operating in buck mode. When satisfied When this occurs, it is determined that the switching power converter is operating in boost mode. When satisfied When this occurs, it is determined that the switching power converter is operating in buck-boost mode.

[0019] In this embodiment, a preset target output voltage is used. Set to 48V, preset hysteresis threshold If set to 2V, the system will enter buck mode when the input voltage is higher than 50V, boost mode when the input voltage is lower than 46V, and buck-boost transition mode when the input voltage is in the 46V-50V range. The hysteresis threshold setting can avoid frequent mode switching caused by input voltage ripple or small disturbances, thereby improving the operational stability of the entire system using the switching power supply converter.

[0020] S2 Adaptive Parameter Tuning: Based on the operating mode determination of the current switching power supply converter, the corresponding soft-switching drive mechanism is matched, and combined with real-time operating status data of the converter including input voltage, output voltage, load current, drain-source voltage of the switching transistor, junction temperature of the switching transistor, and inductor current, the adaptive parameter tuning control strategy is executed with the goal of minimizing total operating losses, generating the final converter control parameter set. The adaptive parameter tuning control strategy employs the following... Figure 2 The three-layer progressive iterative architecture shown consists of, in sequence, control parameter base value mapping, control parameter optimization iteration, and parameter dynamic correction iteration.

[0021] The following sections describe the specific implementation process of converter control parameter set generation and soft-switching driver adaptation for each operating mode: (1) Voltage reduction working mode When the switching power supply converter operates in buck mode, the matched soft-switching drive mechanism is a zero-voltage turn-on drive mechanism for the high-voltage side bridge arm switch; in this buck mode, the second low-voltage side switch... Maintain constant conduction, first low-voltage side switching transistor Maintain constant shutdown, only on the high-voltage side. , It operates in a complementary PWM mode, and achieves step-down conversion by adjusting the duty cycle of the high-voltage side bridge arm. The voltage transfer ratio satisfies the condition that the output voltage is equal to the product of the duty cycle of the high-voltage side bridge arm and the input voltage.

[0022] The specific implementation steps of the adaptive parameter tuning control strategy in buck operating mode are as follows: S211. Control parameter base value mapping in buck operation mode Collect current input voltage Load current In accordance with the operating mode, the offline-calibrated optimal parameter mapping table for all operating conditions of the buck mode is invoked to... , Bilinear interpolation is performed on the index to obtain the initial switching frequency. Initial bridge arm dead time Initial resonance timing offset Specifically, this involves multi-dimensional lookup table data stored in the controller's on-chip Flash memory; simultaneously, the ideal duty cycle is calculated based on the ideal buck transfer ratio using voltage ratio conversion. This is the duty cycle reference value. An input voltage feedforward compensation term is introduced to correct the duty cycle reference value, thus obtaining the initial high-voltage side arm bridge duty cycle reference value. The final output is the initial control parameter base value. The ideal buck transmission ratio is the ratio of the preset target output voltage to the current input voltage.

[0023] The full-condition optimal parameter mapping table is pre-calibrated through offline efficiency testing of the prototype. It stores the control parameter benchmarks that enable the switching power supply converter to achieve local optimal efficiency under different input voltages and load currents, providing reasonable initial values ​​for subsequent iterations and narrowing the optimization range.

[0024] S221. Iterative optimization of control parameters in buck mode Construct a mathematical model of the total losses of the converter in buck mode, and define the total operating losses of the converter in the mathematical model of total losses. Due to conduction loss Switching losses Drive loss and inductor core loss It consists of four parts, namely Among them, conduction losses include the conduction losses of the high-voltage side switching transistor, the copper losses of the inductor, and... Conduction loss; Switching loss includes only the switching action loss of the high-voltage side arm; All components of the total operating loss are functions of the switching frequency, arm dead time, and arm duty cycle.

[0025] With the goal of minimizing total operating losses, three types of constraints are set: voltage regulation constraint, soft switching constraint, and stress constraint. Among them, the voltage regulation constraint is the output ripple index, which is used to limit the output voltage fluctuation range within the design allowable range; the soft switching constraint is the soft switching implementation condition, which is used to ensure that the parasitic capacitance is charged and discharged before the switching transistor is turned on; the stress constraint is the rated stress of the device, which is used to ensure that the switching transistor and inductor operate within the rated electrical parameter range.

[0026] Based on the initial control parameter base value Starting from the gradient descent method, numerical iterative optimization is performed. After each iteration, the total operating loss is calculated. The process is considered complete when the difference between the total operating losses of two adjacent iterations is less than a preset convergence threshold. (In this embodiment, the power is set to 10mW) When the iteration converges, the theoretically optimal control parameters are output. .

[0027] S331. Dynamic parameter correction and iteration in buck mode The real-time operating status feedback of the switching power supply converter is collected, including the zero-crossing time of the drain-source voltage of the switching transistor, the inductor current ripple, and the junction temperature of the switching transistor. Three correction iterations are performed on the theoretical optimal control parameters, namely soft switching margin correction, ripple constraint correction, and temperature drift correction. The soft-switching margin correction is as follows: detection The zero-voltage turn-on margin is calculated by taking the difference between the measured resonance completion time and the currently set dead time at the zero-crossing moment of the drain-source voltage before turn-on. This means achieving margin through soft switching; adjusting the dead time of the high-voltage side arm using a proportional iterative algorithm, iterating until... (In this embodiment, convergence is set to 50ns) to ensure that the soft switch is reliably implemented and the dead-time conduction loss is minimized; The ripple constraint correction is as follows: the switching frequency is iteratively adjusted based on the measured inductor current ripple and output voltage ripple; if the ripple exceeds the upper limit, the frequency is increased; if the ripple margin is too large, the frequency is decreased to reduce switching losses, and the lowest switching frequency is achieved under the premise of meeting the ripple index. The temperature drift correction involves real-time adjustment of the on-resistance parameters based on the junction temperature of the switching transistor, updating the internal weighting coefficients of the total loss mathematical model of the converter, fine-tuning the duty cycle and dead time of the high-voltage side arm bridge, and compensating for the device parameter drift caused by temperature changes.

[0028] The three corrections are executed synchronously and iteratively. After all convergence conditions are met, the converter control parameters for the final execution of the buck mode are output, including the duty cycle of the high-voltage side arm, the switching frequency, the arm dead time, and the resonant timing offset.

[0029] (2) Boost working mode When the switching power converter operates in boost mode, the matched soft-switching drive mechanism is a zero-voltage turn-on drive mechanism for the low-voltage side bridge arm switch; the first switch on the high-voltage side of this switching power converter... Maintain constant conduction, second high-voltage side switch tube Maintain constant shut-off, only on the low-pressure side. , It operates in a complementary PWM mode, and achieves boost conversion by adjusting the duty cycle of the low-voltage side bridge arm. The voltage transfer ratio satisfies the condition that the output voltage is equal to the ratio of the input voltage to the complement of the low-voltage side duty cycle.

[0030] In boost mode, the adaptive parameter tuning control strategy follows the same adaptive parameter tuning control strategy, but is adjusted specifically for boost mode. The specific implementation steps are as follows: S212. Control parameter base value mapping in boost mode The optimal parameter mapping table for all operating conditions in boost mode is used for interpolation calculations to obtain the initial switching frequency, initial bridge arm dead time, and initial resonant timing offset. Based on the ideal boost transfer ratio, the ideal duty cycle is calculated through voltage proportional conversion, and the initial duty cycle base value is obtained by combining input voltage feedforward compensation. Output the initial control parameter base values.

[0031] S222. Iterative optimization of control parameters in boost mode Construct a mathematical model of the total losses of the converter in boost mode. The conduction losses include the conduction losses of the low-voltage side switching transistors, inductor copper losses, and... Conduction loss; switching loss includes only the switching action loss of the low-voltage side bridge arm. With the objective function of minimizing the total loss under operating conditions, gradient descent iterative optimization is performed under the constraints of voltage regulation, soft switching, and stress constraints. After convergence, the theoretically optimal control parameters in boost mode are output.

[0032] S332. Dynamic parameter correction and iteration in boost mode The zero-voltage turn-on margin is calculated by acquiring the zero-crossing moment of the drain-source voltage of the low-voltage side switch, and the dead time of the low-voltage side bridge arm is corrected accordingly. Output ripple correction and temperature drift correction are completed simultaneously, and the final output converter control parameters executed in boost mode are given, including the duty cycle of the low-voltage side bridge arm, switching frequency, bridge arm dead time and resonance timing offset.

[0033] (3) Transition working mode of boosting and boosting When the switching power supply converter operates in buck-boost transition mode, the matched soft-switching drive mechanism is a phase-shift resonance zero-voltage turn-on drive mechanism for all bridge arm switches. In this buck-boost transition mode, all four switches operate in PWM mode, and the voltage is continuously regulated through phase-shift control of the front and rear bridge arms. The bidirectional resonance of the inductor and the parasitic capacitance of the switch is used to achieve zero-voltage turn-on of all switches, solving the problem of extreme duty cycle and sharp drop in efficiency in single-mode control when the input and output voltages are close.

[0034] The adaptive parameter tuning control strategy under the buck-boost transition mode adds a phase shift angle optimization variable to the original strategy. The specific implementation steps are as follows: S213. Control parameter base value mapping under buck-boost transition working mode By calling the optimal parameter mapping table for all operating conditions in transition mode, and interpolating using input voltage and load current as indices, the initial switching frequency, initial bridge arm dead time, initial resonant timing offset, and initial phase shift angle are obtained. The initial duty cycle reference value of both the front and rear bridge arms is set to 0.5. Combined with the input voltage feedforward correction phase angle reference, the output additional initial control parameter base value including the phase angle is generated.

[0035] S223. Control parameter optimization and iteration under buck-boost transition mode A mathematical model of total losses under the buck-boost transition operating mode is constructed. Switching losses include all switching losses of the four switching transistors, and conduction losses include all conduction losses of the four switching transistors and the inductor. With the goal of minimizing total losses under operating conditions, the phase shift angle is incorporated as an optimization variable. Gradient descent iterative optimization is performed under constraints of voltage regulation, soft switching, and stress. After convergence, the output includes theoretically optimal control parameters comprising the duty cycle of the front and rear bridge arms, phase shift angle, switching frequency, bridge arm dead time, and resonant timing offset.

[0036] S333. Dynamic parameter correction and iteration in buck-boost transition mode. The zero-crossing time of the drain-source voltage of the four switching transistors is detected respectively, the zero-voltage turn-on margin of each bridge arm is calculated, and the dead time and phase shift angle of the bridge arm before and after correction are corrected accordingly; the output ripple correction and temperature drift correction are completed simultaneously, and the final output converter control parameters executed in the buck-boost transition mode are finally output.

[0037] S3. Voltage Regulation Conversion Execution: The converter control parameters are input to the drive generation unit, and combined with the voltage and current dual closed-loop control circuit, four drive signals with dead time are generated for the switching transistors. After power amplification, these signals are applied to the four switching transistors of the main power topology to complete the voltage regulation conversion over a wide input voltage range. The specific implementation steps are as follows: Voltage outer loop sampling output voltage , and the preset target output voltage After comparison, the PI regulator outputs a reference value for the inductor current; the inner current loop samples the energy storage inductor current. The duty cycle correction is then output via a PI regulator after being compared with the inductor current reference value.

[0038] The duty cycle correction is superimposed on the bridge arm duty cycle of the three-layer iterative output to obtain the real-time duty cycle command. Combined with the switching frequency, bridge arm dead time, resonant timing offset and phase shift angle, four PWM drive signals conforming to soft switching timing are generated to drive the switching transistors to complete the power conversion.

[0039] The voltage and current dual closed-loop control circuit ensures the steady-state accuracy and dynamic response speed of the output voltage, while the adaptive parameter tuning ensures optimal loss in all operating modes. The two work together to achieve a balance between high efficiency and high performance.

[0040] The switching power converter control method in this embodiment is also equipped with a smooth, non-disruptive switching mechanism between operating modes to mitigate output disturbances caused by mode switching when the input voltage fluctuates over a wide range. The specific implementation steps are as follows: Hysteresis Interval Pre-determination: When the input voltage is detected to enter the mode switching hysteresis interval and the distance to the switching threshold is less than the set margin, the converter control parameter tuning calculation for the target operating mode is initiated in advance. The converter control parameter tuning calculation is an adaptive parameter tuning control strategy, which solves for the optimal converter control parameters for the target operating mode before the formal switching. The width of the mode switching hysteresis interval is determined by the preset hysteresis threshold. This method effectively suppresses frequent mode switching caused by small fluctuations in input voltage and ripple interference, thereby improving the reliability of system operation.

[0041] State pre-synchronization matching: The steady-state inductor current and output voltage values ​​of the current operating mode are compared with the corresponding steady-state values ​​of the target operating mode. The initial converter control parameter reference of the target operating mode is adjusted to ensure that the steady-state operating points of the two operating modes are consistent at the moment of switching, and to eliminate control quantity jumps.

[0042] Linear gradual transition: When the working mode switch is officially triggered, all controller control parameters such as duty cycle, switching frequency, dead time, and phase shift angle do not change directly. Instead, they gradually transition to the converter control parameters of the target working mode within 20 switching cycles with a set slope.

[0043] Dynamic closed-loop correction: During the transition process, the voltage and current dual closed-loop control loops work continuously to correct the deviation of the controller control parameters in real time, limiting the output voltage fluctuation to within ±1%, and eliminating the spike impact of the inductor current to achieve seamless switching.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-efficiency, wide-input-voltage-range switching power supply converter control method, characterized in that, Includes the following steps: S1. Real-time acquisition of the input voltage of the switching power supply converter, and adaptive determination of the operating mode of the switching power supply converter based on the amplitude relationship between the input voltage and the preset target output voltage; S2. Determine the corresponding soft-switching drive mechanism based on the working mode, and combine it with the operating status data of the switching power supply converter. With the goal of minimizing the total loss under the operating condition, generate the converter control parameters by executing an adaptive parameter tuning control strategy. S3. Based on the converter control parameters, control the switching power converter to complete the regulated power conversion over a wide input voltage range.

2. The switching power supply converter control method according to claim 1, characterized in that, The rules for determining the working mode are as follows: When the input voltage is greater than the sum of the preset target output voltage and the preset hysteresis threshold, the operating mode of the switching power supply converter is determined to be buck operating mode. When the input voltage is less than the difference between the preset target output voltage and the preset hysteresis threshold, the operating mode of the switching power supply converter is determined to be boost mode. When the absolute value of the difference between the input voltage and the preset target output voltage is less than or equal to the preset hysteresis threshold, the operating mode of the switching power supply converter is determined to be the buck-boost transition operating mode.

3. The switching power supply converter control method according to claim 2, characterized in that, The soft-switching drive mechanism corresponding to the buck operating mode is a zero-voltage turn-on drive mechanism for the high-voltage side bridge arm switch. By acquiring real-time operating status data of the switching power supply converter, an adaptive parameter tuning control strategy is executed with the goal of minimizing the total operating loss, generating converter control parameters including the high-voltage side bridge arm duty cycle, switching frequency, bridge arm dead time, and resonant timing offset.

4. The switching power supply converter control method according to claim 2, characterized in that, The soft-switching drive mechanism corresponding to the boost operating mode is a zero-voltage turn-on drive mechanism for the low-voltage side bridge arm switch. By acquiring real-time operating status data of the switching power supply converter, an adaptive parameter tuning control strategy is executed with the goal of minimizing the total operating loss, generating converter control parameters including the duty cycle of the low-voltage side bridge arm, switching frequency, bridge arm dead time, and resonant timing offset.

5. The switching power supply converter control method according to claim 1, characterized in that, The soft-switching drive mechanism corresponding to the buck-boost transition working mode is a phase-shift resonance zero-voltage turn-on drive mechanism for the full-bridge arm switching transistors. By acquiring real-time operating status data of the switching power converter, an adaptive parameter tuning control strategy is executed with the goal of minimizing the total operating loss, generating converter control parameters including the duty cycle of the front and rear bridge arms, phase shift angle, switching frequency, bridge arm dead time, and resonance timing offset.

6. The switching power supply converter control method according to any one of claims 3 to 5, characterized in that, The adaptive parameter tuning control strategy is as follows: S21. Control parameter base value mapping: Based on the current operating mode, input voltage and load current of the switching power supply converter, the offline calibrated full-condition optimal parameter mapping table is called to perform interpolation calculation, and the duty cycle reference value is corrected by combining input voltage feedforward compensation, and the initial control parameter base value is output. S22. Control parameter optimization iteration: Construct a mathematical model of the total loss of the converter under the corresponding working mode, with the minimum total loss under the working condition as the objective function and the soft switching implementation conditions, device rated stress, and output ripple index as constraints. Perform gradient descent iteration optimization on the initial control parameter base value. When the difference between the total loss under the working condition of two adjacent gradient descent iterations is less than the preset convergence threshold, output the theoretically optimal control parameters. S23. Parameter Dynamic Correction Iteration: Collect the real-time operating status feedback of the switching power supply converter, and iteratively correct the soft switching margin, output ripple amplitude and device temperature drift respectively, and dynamically adjust the theoretically optimal control parameters to obtain the converter control parameters.

7. The switching power supply converter control method according to any one of claims 3 to 5, characterized in that, The soft-switching drive mechanism calculates the margin by detecting the zero-crossing moment of the drain-source voltage of the switching transistor in real time, and dynamically adjusts the dead time of the bridge arm and the resonant timing offset based on the soft-switching margin to ensure that the switching transistor achieves zero-voltage turn-on in each operating mode.

8. The switching power supply converter control method according to claim 1, characterized in that, The method also includes smooth, non-disruptive switching between operating modes. When the input voltage is detected to enter the mode switching hysteresis interval, the converter control parameter tuning calculation for the target operating mode is initiated in advance. When the target operating mode is officially switched, the converter control parameters are subjected to a linear gradual transition to maintain the output voltage and inductor current continuously without jumps.

9. The switching power supply converter control method according to claim 8, characterized in that, The width of the mode switching hysteresis interval is determined by a preset hysteresis threshold, which is used to suppress frequent operating mode switching caused by small fluctuations in input voltage.

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