Power correction system and method of rectification power supply module

Abstract

The invention provides a power correction system and method for a rectification power supply module. The method comprises the following steps: monitoring a voltage phase signal and an input current waveform of an input side of a target rectification power supply module; based on the voltage phase signal and the input current waveform, identifying a current interruption mode of the target rectification power supply module under a light-load working condition, and calculating a phase lag amount of an input current fundamental wave generated by the current interruption mode relative to the input voltage waveform and harmonic energy distribution caused by a current on-off peak; constructing a composite power compensation parameter for the discontinuous current mode according to the phase lag amount and the harmonic energy distribution; determining a power correction signal with self-adaptive dead time by combining the composite power compensation parameter with the current interruption characteristic of the target rectification power supply module under the light-load working condition; and performing power correction on the input current waveform through the power correction signal. According to the technical scheme provided by the invention, stable power correction can be realized in a light-load current discontinuous mode.

Description

Technical Field

[0001] This application relates to the field of power correction technology, and more specifically, to a power correction system and method for a rectifier power supply module. Background Technology

[0002] In power electronics and electrical drives, load fluctuations, component aging, and changes in ambient temperature and humidity under actual operating conditions can all cause the output power of equipment to deviate from the theoretical design value. This deviation not only affects the processing quality and system energy efficiency, but also accelerates equipment wear and even causes failures. Traditional fixed-parameter power control strategies are difficult to adapt to such dynamic changes and cannot guarantee output accuracy and stability. Therefore, power correction has emerged. Power correction can achieve precise closed-loop control of power. In order to meet the increasingly stringent requirements of modern power grids for power quality, power correction has become one of the key technologies to ensure the efficient and stable operation of power systems.

[0003] In existing power correction methods, the power correction first involves real-time acquisition of key parameters such as output power, voltage, and current by sensors. Subsequently, the controller compares the measured values ​​with internally set target values ​​or expected values ​​dynamically calculated from the operating conditions to determine the power deviation. Based on this power deviation, a corresponding adjustment command is generated, which then drives the actuator to change its conduction state, ultimately completing the output power correction. However, in the power correction of rectifier power supply modules, under the discontinuous current mode under light load, the phase lag and ripple harmonic distortion caused by the discontinuity of the input current waveform in the power factor correction unit of the rectifier power supply module make it difficult for traditional power factor correction control strategies to effectively maintain a high power factor and low total harmonic distortion. Consequently, the power of the rectifier power supply module is difficult to correct. Therefore, how to achieve stable power correction under the discontinuous current mode under light load has become a challenge for the industry. Summary of the Invention

[0004] This application provides a power correction system and method for a rectifier power supply module, which can achieve stable power correction in light load current discontinuous mode.

[0005] In a first aspect, this application provides a power correction method for a rectifier power supply module, comprising the following steps: Monitor the voltage phase signal and input current waveform on the input side of the target rectifier power supply module; Based on the voltage phase signal and the input current waveform, the current discontinuity mode of the target rectifier power module under light load conditions is identified, and the phase lag of the input current fundamental wave relative to the input voltage waveform and the harmonic energy distribution caused by the current switching spikes generated by the current discontinuity mode are calculated. Based on the phase lag and the harmonic energy distribution, a composite power compensation parameter for the discontinuous current mode is constructed. The composite power compensation parameter includes a feedforward compensation coefficient for phase calibration and a feedback suppression weight for harmonic cancellation. The power correction signal with adaptive dead time is determined by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectifier power supply module under light load conditions. The power correction signal controls the on-time and duty cycle of the power switching device to correct the power of the input current waveform.

[0006] In some embodiments, identifying the current discontinuity mode of the target rectifier power module under light load conditions based on the voltage phase signal and the input current waveform specifically includes: The voltage phase signal and the input current waveform are filtered and preprocessed to obtain a smoothed voltage phase signal and a smoothed current waveform; The zero-crossing time of the input current is extracted based on the smoothed current waveform; Multiple switching cycle reference time periods are determined based on the smoothed voltage phase signal; Within each switching cycle reference period, the smooth current waveform is judged to have a continuous zero current period based on the zero-crossing time; The duty cycle of the continuous zero-current period within a series of consecutive switching cycle reference periods is statistically analyzed. When the duty cycle of the continuous zero-current period within a series of consecutive switching cycle reference periods exceeds the preset discontinuity threshold, the target rectifier power supply module is determined to be in discontinuous current mode.

[0007] In some embodiments, calculating the phase lag of the input current fundamental wave relative to the input voltage waveform generated by the discontinuous current mode and the harmonic energy distribution caused by current switching spikes specifically includes: Based on the reference time period of the switching cycle corresponding to the current discontinuous mode, the fundamental phase of the input voltage and the fundamental phase of the input current are extracted. Calculate the difference between the fundamental phase of the input current and the fundamental phase of the input voltage to obtain the phase lag of the input current fundamental phase relative to the input voltage waveform; Fourier decomposition is performed on the input current waveform during the reference period of the switching cycle to obtain the harmonic components corresponding to the current switching peaks. The corresponding harmonic energy is calculated based on the amplitude of each harmonic component, forming the harmonic energy distribution caused by the current switching peak.

[0008] In some embodiments, constructing composite power compensation parameters for discontinuous current modes based on the phase lag and the harmonic energy distribution specifically includes: Based on the mapping relationship between the phase hysteresis and the preset phase-compensation coefficient, the feedforward compensation coefficient for phase calibration is calculated; The proportion of each harmonic energy is analyzed based on the harmonic energy distribution, and the feedback suppression weight for harmonic cancellation is calculated using a harmonic suppression algorithm. The feedforward compensation coefficient and the feedback suppression weight are combined to form a composite power compensation parameter for discontinuous current mode.

[0009] In some embodiments, determining a power correction signal with adaptive dead time by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectified power supply module under light load conditions specifically includes: Extract the feedforward compensation coefficient and feedback suppression weight from the composite power compensation parameters; The rising edge trigger time of the power correction signal is adjusted based on the feedforward compensation coefficient. The falling edge turn-off time of the power correction signal is adjusted based on the feedback suppression weight; The initial dead time is calculated based on the time interval between the rising edge trigger time and the falling edge turn-off time. The initial dead time is corrected by the current discontinuity characteristics of the target rectifier power supply module under light load conditions to obtain the adaptive dead time. The rising edge trigger time, falling edge turn-off time, and adaptive dead time are integrated and adjusted to generate a power correction signal with adaptive dead time.

[0010] In some embodiments, the voltage phase signal at the input side of the target rectified power module is monitored by a voltage sampling circuit connected to the target rectified power module.

[0011] In some embodiments, the input current waveform on the input side of the target rectified power module is monitored by a current sensing element connected to the target rectified power module.

[0012] Secondly, this application provides a power correction system for a rectifier power supply module, used to perform a power correction method for the rectifier power supply module, the system comprising: The monitoring module is used to monitor the voltage phase signal and input current waveform on the input side of the target rectifier power supply module; The processing module is used to identify the current discontinuity mode of the target rectifier power supply module under light load conditions based on the voltage phase signal and the input current waveform, and to calculate the phase lag of the input current fundamental wave relative to the input voltage waveform and the harmonic energy distribution caused by the current switching spikes generated by the current discontinuity mode. The processing module is further configured to construct composite power compensation parameters for the current discontinuous mode based on the phase lag and the harmonic energy distribution. The composite power compensation parameters include a feedforward compensation coefficient for phase calibration and a feedback suppression weight for harmonic cancellation. The processing module is also used to determine a power correction signal with adaptive dead time by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectifier power supply module under light load conditions. The execution module is used to control the on-time and duty cycle of the power switching device through the power correction signal in order to perform power correction on the input current waveform.

[0013] Thirdly, this application provides a computer device, the computer device including a memory and a processor, the memory storing code, and the processor being configured to acquire the code and execute the power correction method of the rectifier power supply module described above.

[0014] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the power correction method for the rectifier power supply module described above.

[0015] The technical solutions provided by the embodiments disclosed in this application have the following beneficial effects: The power correction system and method for a rectifier power module provided in this application first monitors the voltage phase signal and input current waveform on the input side of the target rectifier power module. Second, based on the voltage phase signal and the input current waveform, the current discontinuity mode of the target rectifier power module under light load conditions is identified, and the phase lag of the fundamental input current relative to the input voltage waveform and the harmonic energy distribution caused by current switching spikes generated by the current discontinuity mode are calculated. Further, a composite power compensation parameter for the current discontinuity mode is constructed based on the phase lag and the harmonic energy distribution. The composite power compensation parameter includes a feedforward compensation coefficient for phase calibration and a feedback suppression weight for harmonic cancellation. Then, a power correction signal with adaptive dead time is determined by combining the composite power compensation parameter with the current discontinuity characteristics of the target rectifier power module under light load conditions. Finally, the power correction signal controls the on-time and duty cycle of the power switching device to perform power correction on the input current waveform.

[0016] Therefore, this application can achieve stable power correction under light-load current discontinuous mode. First, monitoring the voltage phase signal and input current waveform on the input side of the target rectifier power supply module provides real-time raw data support for subsequent operating condition identification and power correction signal generation. Second, based on the voltage phase signal and input current waveform, the current discontinuity mode is identified and the phase lag and harmonic energy distribution are calculated to accurately locate the core problem target of power correction under light-load conditions of the target rectifier power supply module, quantify the phase deviation and harmonic interference degree, avoid blind compensation, and thus provide a clear basis for the construction of subsequent power compensation parameters. Furthermore, based on the phase lag and harmonic energy distribution, a composite power compensation parameter including feedforward compensation coefficient and feedback suppression weight is constructed to achieve accurate adaptation of phase calibration and harmonic suppression, solving the limitation that a single compensation parameter cannot take into account both phase deviation and harmonic distortion, and providing core execution parameters for generating targeted power correction signals. Then, through composite power compensation... By combining parameters with the characteristics of discontinuous current, a power correction signal with adaptive dead time is determined. This allows the power correction signal to accurately carry phase calibration and harmonic suppression requirements through both rising and falling edges. Simultaneously, the adaptive dead time avoids common-mode conduction of power switching devices, reduces ineffective losses, and improves the adaptability and operational safety of the control signal to discontinuous current conditions. Finally, by controlling the power switching devices through the power correction signal to correct the input current waveform, parameter compensation and signal control can be transformed into actual current optimization, effectively improving the power factor of the rectifier power supply module under light load conditions. This ensures stable and efficient operation of the rectifier power supply module in the light load range. Furthermore, in the light load discontinuous current mode, the power factor correction unit of the rectifier power supply module cannot effectively maintain a high power factor and low total harmonic distortion due to phase lag and ripple harmonic distortion caused by the discontinuity of the input current waveform. In summary, the technical solution provided in this application can achieve stable power correction in the light load discontinuous current mode. Attached Figure Description

[0017] Figure 1 This is an exemplary flowchart of a power correction method for a rectifier power module according to some embodiments of this application; Figure 2 This is an exemplary flowchart illustrating the determination of current discontinuity modes according to some embodiments of this application; Figure 3 This is a schematic diagram of the power correction system of a rectifier power module according to some embodiments of this application; Figure 4 This is a schematic diagram of the structure of a computer device that implements a power correction method for a rectifier power supply module according to some embodiments of this application. Detailed Implementation

[0018] To better understand the technical solution of this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] refer to Figure 1 This figure is an exemplary flowchart of a power correction method for a rectifier power supply module according to some embodiments of this application. The figure mainly includes the following steps: In step S101, the voltage phase signal and input current waveform of the target rectifier power supply module input side are monitored.

[0020] In a specific implementation, the voltage phase signal and input current waveform of the target rectifier power module can be monitored by a voltage sampling circuit and a current sensing element connected to the target rectifier power module. This will not be elaborated here. In addition, in other embodiments, other monitoring elements can be used to monitor the voltage phase signal and input current waveform of the target rectifier power module. This is not limited here.

[0021] It should be noted that, in this application, the voltage phase signal refers to the electrical signal that reflects the instantaneous phase angle information of the AC input voltage waveform of the rectifier power supply module; the input current waveform refers to the waveform of the original current signal, which includes various distortions and phase lags, obtained by the rectifier power supply module from the input side and changes over time. By monitoring the voltage phase signal and the input current waveform, the voltage phase signal provides a synchronization reference for the entire power correction process, enabling the control system to accurately sense the phase change of the grid voltage. The monitoring of the input current waveform reflects the characteristics of the actual power consumption of the rectifier power supply. By analyzing its phase difference with the reference voltage, the degree of waveform distortion, and harmonic components, the root cause of the power factor decline can be accurately diagnosed, thereby providing feedback for the subsequent generation of targeted compensation modulation signals, and realizing the accurate reshaping of the input current waveform and the effective improvement of the power factor.

[0022] In step S102, the current discontinuity mode of the target rectifier power supply module under light load is identified based on the voltage phase signal and the input current waveform, and the phase lag of the input current fundamental wave relative to the input voltage waveform and the harmonic energy distribution caused by the current switching spikes generated by the current discontinuity mode are calculated.

[0023] In some embodiments, reference Figure 2 As shown in the figure, this is an exemplary flowchart illustrating the determination of the current discontinuity mode according to some embodiments of this application. In this embodiment, the identification of the current discontinuity mode of the target rectifier power supply module under light load conditions based on the voltage phase signal and the input current waveform can be achieved by the following steps: In step S1021, the voltage phase signal and the input current waveform are filtered and preprocessed to obtain a smoothed voltage phase signal and a smoothed current waveform. In step S1022, the zero-crossing time of the input current is extracted based on the smoothed current waveform; In step S1023, multiple switching cycle reference time periods are determined based on the smoothed voltage phase signal; In step S1024, within each switching cycle reference time period, it is determined whether the smooth current waveform has a continuous zero current period based on the zero-crossing time. In step S1025, the duty cycle of the continuous zero current period within a series of consecutive switching cycle reference periods is counted. When the duty cycle of the continuous zero current period within a series of consecutive switching cycle reference periods exceeds the preset discontinuity threshold, the target rectifier power supply module is determined to be in the current discontinuity mode.

[0024] In specific implementation, firstly, the voltage phase signal and input current waveform are pre-processed using an existing first-order RC low-pass filter. Specifically, the voltage phase signal and input current waveform are respectively connected to a first-order RC low-pass filter circuit composed of resistors and capacitors. The charging and discharging characteristics of the capacitor attenuate the high-frequency noise components in the signal, outputting a smooth voltage phase signal and a smooth current waveform that eliminate high-frequency interference. The smooth voltage phase signal refers to a voltage phase characterization signal without high-frequency fluctuations after filtering, and the smooth current waveform refers to a current time-domain waveform without sharp glitches after filtering. Secondly, the smooth current waveform is connected to a... A zero-crossing comparator is used, with its reference level set to zero potential. When the smoothed current waveform jumps from a negative potential to a positive potential or from a positive potential to a negative potential and crosses zero potential, the output level of the zero-crossing comparator changes. The time point of this level change is recorded as the zero-crossing point of the input current. The reference level of the zero-crossing comparator can be set according to actual needs and is not limited here. The zero-crossing point refers to the time node corresponding to the input current waveform crossing zero potential. Further, the smoothed voltage phase signal is input to a phase-locked loop (PLL) circuit. The PLL circuit compares the phase difference between the input smoothed voltage phase signal and its own voltage-controlled oscillator (VCO) output signal using a phase detector. The phase difference signal is obtained, filtered by a loop filter, and then a control voltage is output to adjust the oscillation frequency of the voltage-controlled oscillator (VCO) so that the phase of the VCO output signal is synchronized with the phase of the smoothed voltage phase signal. One cycle of the VCO output signal is used as a switching cycle reference time period, and multiple switching cycle reference time periods are continuously acquired. The phase-locked loop (PLL) circuit is an electronic circuit that achieves phase synchronization between the output signal and the input reference signal through a negative feedback mechanism. Its core components include three basic modules: a phase detector, a loop filter, and a VCO. The phase detector is used to compare the input reference signal with the VCO output signal in real time. The phase difference is converted into a corresponding phase difference signal. The loop filter filters the phase difference voltage output by the phase detector to remove high-frequency components and noise, and outputs a smooth control voltage. The oscillation frequency of the voltage-controlled oscillator is regulated by the control voltage output by the loop filter. When the phase of the input reference signal changes, the error voltage will adjust the frequency of the voltage-controlled oscillator accordingly, so that the phase of the output signal of the voltage-controlled oscillator gradually approaches and eventually locks with the phase of the input reference signal, thereby achieving phase synchronization between the two. The switching cycle reference period refers to the time segment used to divide the current waveform analysis interval based on the oscillation period synchronized with the voltage phase.Then, within each switching cycle reference period, using the zero-crossing point as a reference, the amplitude of the smoothed current waveform is monitored, and a near-zero amplitude threshold is set (this amplitude threshold is a commonly set current detection accuracy threshold in the relevant field, and can be set according to actual needs; it is not limited here). The time period during which the amplitude of the smoothed current waveform remains within the amplitude threshold range is defined as the continuous zero-current period. The continuous zero-current period refers to the time interval during which the current amplitude remains close to zero within the switching cycle reference period. Finally, the ratio of the duration of the continuous zero-current period within each switching cycle reference period to the total duration of the switching cycle reference period is calculated as the duty cycle of the continuous zero-current period within a single switching cycle reference period. Multiple such cycles are continuously recorded. The duty cycle corresponding to the reference switching cycle period is set to 3-5 statistical samples (typically selected in the relevant field). Each statistically obtained duty cycle is compared with a preset discontinuity threshold (this discontinuity threshold is a critical duty cycle value preset in the relevant field based on the current discontinuity characteristics under light load conditions; the specific value can be set according to actual needs). When the duty cycle of the continuous zero-current period in multiple consecutive (i.e., 3-5) reference switching cycle periods exceeds the preset discontinuity threshold, the target rectifier power supply module is determined to be in current discontinuity mode. The duty cycle of the continuous zero-current period refers to the ratio of the duration of the continuous zero-current period to the total duration of the reference switching cycle period. The preset discontinuity threshold is a critical duty cycle value used to distinguish between continuous and discontinuous current states.

[0025] It should be noted that the discontinuous current mode in this application refers to the operating mode in which the current generated by the power switching device of the rectifier power supply module under light load conditions cannot be continuously conducted to the next switching cycle and there is a clear zero current interruption period. In power correction, identifying and determining the discontinuous current mode can provide a prerequisite and operating condition adaptation basis for accurate power factor correction under light load conditions. Because when the rectifier power supply module is under light load, the current generated by the power switching device is easily unable to be sustained to the next switching cycle due to the low load energy demand, forming a discontinuous current interruption mode. This mode will directly cause the fundamental frequency of the input current to have an additional phase lag relative to the input voltage, and the current switching peak will cause aggravated harmonic distortion, which will easily lead to increased switching losses of the power switching device and a decrease in the power factor. By accurately determining the discontinuous current mode, the core target of power correction under light load conditions can be clearly identified, providing an analytical basis for subsequent calculation of phase lag and harmonic energy distribution, thereby supporting the accurate construction of composite power compensation parameters, so that the controller of the power factor correction unit can generate a power correction signal adapted to the discontinuous mode.

[0026] In some embodiments, the calculation of the phase lag of the input current fundamental wave relative to the input voltage waveform generated by the discontinuous current mode and the harmonic energy distribution caused by current switching spikes is performed using the following steps: Based on the reference time period of the switching cycle corresponding to the current discontinuous mode, the fundamental phase of the input voltage and the fundamental phase of the input current are extracted. Calculate the difference between the fundamental phase of the input current and the fundamental phase of the input voltage to obtain the phase lag of the input current fundamental phase relative to the input voltage waveform; Fourier decomposition is performed on the input current waveform during the reference period of the switching cycle to obtain the harmonic components corresponding to the current switching peaks. The corresponding harmonic energy is calculated based on the amplitude of each harmonic component, forming the harmonic energy distribution caused by the current switching peak.

[0027] In specific implementation, firstly, the input voltage signal and input current signal of the reference period of the switching cycle corresponding to the current discontinuous mode are acquired. The input voltage signal and input current signal are then multiplied by a sine reference signal and a cosine reference signal generated by a phase-locked loop circuit, which are in phase and frequency with the fundamental wave of the input voltage. The multiplied signals are then input to a low-pass filter to remove high-frequency components, obtaining DC voltage signals corresponding to the fundamental phases of the input voltage and current. These DC voltage signals are then converted into corresponding phase values ​​through an arctangent operation, yielding the fundamental phases of the input voltage and current. The fundamental phase of the input voltage refers to the phase corresponding to the component in the input voltage signal whose frequency matches the fundamental frequency of the power grid, and the fundamental phase of the input current refers to the phase corresponding to the component in the input current signal whose frequency matches the fundamental frequency of the power grid. Secondly, the extracted fundamental phase of the input current is subtracted from the fundamental phase of the input voltage using a phase difference calculation method to obtain the phase lag of the input current fundamental phase relative to the input voltage waveform. The hysteresis refers to the phase difference corresponding to the time delay between the fundamental input current and the fundamental input voltage. Then, within the reference period of the switching cycle, the discrete sampling points of the acquired input current waveform are subjected to Fourier decomposition using the Discrete Fourier Transform (DFT) algorithm. Specifically, the sequence of discrete sampling points of the input current waveform within the reference period of the switching cycle is used as the input of the DFT algorithm. By calculating the Fourier coefficients corresponding to each harmonic frequency, the fundamental component and each harmonic component are separated. Among them, the components with amplitudes greater than a preset threshold and frequencies that are integer multiples of the fundamental frequency are the harmonic components corresponding to the current switching spikes. The harmonic components refer to the current components in the input current signal whose frequencies are integer multiples of 2 times or more of the fundamental frequency generated by the current switching spikes. Finally, according to the principle of power calculation, the energy values ​​corresponding to each harmonic component are calculated using the amplitude of each harmonic component and the equivalent impedance of the circuit through the square law. Then, the harmonic components and their corresponding energy values ​​are combined in frequency order to form the harmonic energy distribution caused by the current switching spikes.

[0028] It should be noted that, in this application, harmonic energy distribution refers to the set of correspondences between the energy values ​​of each harmonic component and the harmonic frequency. The determination of phase lag and harmonic energy distribution is the core quantitative basis and prerequisite for achieving accurate power correction in discontinuous current mode under light load conditions. The phase lag accurately measures the degree of phase deviation between the fundamental current and the input voltage in discontinuous current mode, providing a clear deviation quantification benchmark for the subsequent construction of feedforward compensation coefficients for phase calibration. The harmonic energy distribution clearly defines each harmonic component and its energy proportion caused by current switching spikes, providing accurate harmonic source data support for constructing feedback suppression weights for harmonic cancellation. Together, they constitute the core data foundation for constructing composite power compensation parameters, enabling the compensation parameters to achieve accurate adaptation to phase deviation and harmonic interference.

[0029] In step S103, a composite power compensation parameter for the current discontinuous mode is constructed based on the phase lag and the harmonic energy distribution. The composite power compensation parameter includes a feedforward compensation coefficient for phase calibration and a feedback suppression weight for harmonic cancellation.

[0030] In some embodiments, constructing composite power compensation parameters for discontinuous current modes based on the phase lag and the harmonic energy distribution is achieved through the following steps: Based on the mapping relationship between the phase hysteresis and the preset phase-compensation coefficient, the feedforward compensation coefficient for phase calibration is calculated; The proportion of each harmonic energy is analyzed based on the harmonic energy distribution, and the feedback suppression weight for harmonic cancellation is calculated using a harmonic suppression algorithm. The feedforward compensation coefficient and the feedback suppression weight are combined to form a composite power compensation parameter for discontinuous current mode.

[0031] It should be noted that the phase-compensation coefficient mapping relationship in this embodiment is set with experimental calibration as the core, based on the current discontinuous mode characteristics of the rectifier power supply module under light load conditions. Specifically, a test platform consistent with the actual application scenario is first built, and test conditions covering different load sizes within the light load range are set. By adjusting the load, the rectifier power supply module is made to enter different degrees of current discontinuity mode. The phase-locked loop is used to extract the fundamental phase of the input voltage and the fundamental phase of the input current under each condition, and the phase lag corresponding to different conditions is calculated. Then, for each phase lag, the feedforward compensation coefficient is adjusted and the phase difference between the fundamental phase of the input current and the fundamental phase of the input voltage is monitored in real time until the phase difference is reduced to the optimal phase calibration effect (i.e., the phase deviation meets the power factor requirements). The corresponding feedforward compensation coefficient is recorded at this time. Then, for all the recorded discrete data pairs of phase lag and corresponding feedforward compensation coefficient, the known least squares method is used to perform curve fitting to obtain a continuous functional relationship, forming a discrete phase-compensation coefficient mapping relationship, which will not be elaborated here.

[0032] In specific implementation, firstly, based on the acquired phase lag, a pre-defined phase-compensation coefficient mapping relationship, calibrated experimentally and stored in the controller, is used to calculate the feedforward compensation coefficient for phase calibration. Specifically, the currently acquired phase lag is used as an index to search the pre-defined phase-compensation coefficient mapping relationship table. If the current phase lag matches a stored value, the corresponding coefficient is directly extracted as the feedforward compensation coefficient. If they do not match, a known linear interpolation algorithm is used to calculate the corresponding coefficient, thus obtaining the feedforward compensation coefficient for phase calibration. The pre-defined phase-compensation coefficient mapping relationship refers to a mapping table formed by pre-testing the feedforward compensation coefficients that achieve the optimal phase calibration effect under different phase lag values ​​and organizing their correspondence. The feedforward compensation coefficient is a parameter used to correct the phase lag of the input current fundamental wave relative to the input voltage. Secondly, the energy value corresponding to each harmonic component in the harmonic energy distribution is divided by the total energy value of all harmonic components to obtain the proportion of each harmonic energy. Then, a known weighted least squares method is used as the harmonic suppression algorithm to calculate the feedforward compensation coefficient for phase calibration. The feedback suppression weights for harmonic cancellation are calculated by using the energy proportion of each harmonic as a weighting factor, and minimizing the sum of the products of the residual energy of each harmonic and its corresponding weighting factor as the objective function. The feedback suppression weights for each harmonic are obtained by solving for the variable values ​​corresponding to the minimum objective function. The harmonic energy proportion refers to the ratio of the energy value of a single harmonic component to the total energy value of all harmonic components. The harmonic suppression algorithm is an algorithm used to calculate the feedback control parameters that can effectively cancel each harmonic. The feedback suppression weights are parameters characterizing the suppression strength of each harmonic. Finally, based on phase calibration... The priority of harmonic suppression in power correction is determined by assigning preset weight coefficients to the feedforward compensation coefficient and the feedback suppression weight (the specific preset weight coefficients for the feedforward compensation coefficient and the feedback suppression weight can be set according to actual needs; for example, the preset weight coefficients for the feedforward compensation coefficient and the feedback suppression weight can be set to 0.6 and 0.4 respectively, which is not limited here). Then, the feedforward compensation coefficient is multiplied by the corresponding preset weight coefficient, and the feedback suppression weight is multiplied by the corresponding preset weight coefficient. Finally, the two product results are combined to form the composite power compensation parameters for the discontinuous current mode.

[0033] It should be noted that the composite power compensation parameters in this application refer to the set of parameters used for comprehensive power correction in discontinuous current mode. The composite power compensation parameters include feedforward compensation coefficients for phase calibration and feedback suppression weights for harmonic cancellation. The feedforward compensation coefficients included in the composite power compensation parameters can directly provide the phase calibration basis for the controller of the power factor correction unit, realizing the directional cancellation of the phase lag of the input current fundamental wave relative to the input voltage. The feedback suppression weights can provide the controller with a harmonic-specific suppression benchmark, ensuring that the harmonics caused by current switching spikes are differentially canceled according to their energy proportions. The composite power compensation parameters formed by the combination of the two enable the controller to accurately generate a power correction signal adapted to the discontinuous current mode, avoiding the limitation of a single compensation parameter being unable to take into account both phase deviation and harmonic distortion. Finally, through adaptive control of the conduction timing, duty cycle, and dead time of the power switching devices, the power factor of the rectifier power supply module under light load conditions is effectively improved.

[0034] In step S104, a power correction signal with adaptive dead time is determined by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectifier power supply module under light load conditions.

[0035] In some embodiments, the determination of a power correction signal with adaptive dead time by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectified power supply module under light load conditions is achieved through the following steps: Extract the feedforward compensation coefficient and feedback suppression weight from the composite power compensation parameters; The rising edge trigger time of the power correction signal is adjusted based on the feedforward compensation coefficient. The falling edge turn-off time of the power correction signal is adjusted based on the feedback suppression weight; The initial dead time is calculated based on the time interval between the rising edge trigger time and the falling edge turn-off time. The initial dead time is corrected by the current discontinuity characteristics of the target rectifier power supply module under light load conditions to obtain the adaptive dead time. The rising edge trigger time, falling edge turn-off time, and adaptive dead time are integrated and adjusted to generate a power correction signal with adaptive dead time.

[0036] In specific implementation, firstly, the feedforward compensation coefficient and feedback suppression weight are extracted from the composite power compensation parameters; secondly, the feedforward compensation coefficient is converted into the corresponding phase compensation amount (i.e., by experimentally recording the actual phase correction effect produced by different feedforward compensation coefficients when offsetting phase lag, a one-to-one correspondence is established between the feedforward compensation coefficient and the corresponding phase correction value to obtain the phase-correction mapping relationship, and then the currently extracted feedforward compensation coefficient is used as input to extract the corresponding phase correction value from the phase-correction mapping relationship, which will not be elaborated here), and then the phase compensation amount is converted into a time offset according to the existing phase-time conversion relationship, and the time offset is superimposed on the rising edge triggering times of each rising edge of the original reference power correction signal to obtain the rising edge triggering time of the adjusted power correction signal. The rising edge triggering time of the power correction signal refers to the time node when the power correction signal jumps from a low level to a high level; furthermore, the duty cycle correction amount corresponding to each harmonic is determined according to the feedback suppression weight (i.e., under different light load conditions). Under discontinuous current operation, different feedback suppression weights are applied to each harmonic, and the duty cycle adjustment of the power switching device that reduces the energy of the harmonic to the target threshold is recorded synchronously. The correspondence between the two is organized into a suppression weight-adjustment mapping relationship. For each harmonic, its corresponding feedback suppression weight is used as input, and the corresponding duty cycle adjustment value is extracted or calculated from the suppression weight-adjustment mapping relationship as the duty cycle correction amount for that harmonic. Based on the fall-edge turn-off times of the original reference power correction signal, the fall-edge turn-off times of the adjusted power correction signal are obtained by offsetting in the reverse direction according to the duty cycle correction amount. The fall-edge turn-off times of the power correction signal refer to the time node when the power correction signal jumps from a high level to a low level. Furthermore, the time difference between the adjusted rising edge trigger time and the falling edge turn-off time is calculated, and the obtained time difference is used as the initial dead time. The initial dead time refers to the dead time obtained only by the difference between the rising edge and the falling edge time without considering the discontinuous current characteristics.Then, obtain the duty ratio of the continuous zero-current period in the current discontinuous characteristic of the target rectifier power module under light load conditions, and use this duty ratio of the continuous zero-current period as a correction factor to substitute it into the preset dead-time correction formula to dynamically adjust the initial dead-time, so as to obtain an adaptive dead-time adapted to the current discontinuous state. Among them, the specific dead-time correction formula is constructed based on the duty ratio of the continuous zero-current period in the current discontinuous characteristic under light load conditions, and the expression is: T = d×(1 - k×D), where T is the adaptive dead-time obtained after correction, d is the initial dead-time calculated from the time interval between the rising-edge trigger moment and the falling-edge turn-off moment, D is the duty ratio of the continuous zero-current period within the current switching cycle reference period, and k is a preset dead-time correction coefficient. This dead-time correction coefficient k is determined through experimental calibration. That is, under different light load current discontinuous conditions, test the optimal dead-time adjustment ratio corresponding to different Ds, and take the adjustment ratio that can prevent the power switch device from conducting in the common state and minimize the switching loss as the value of k. Its value range is 0 < k < 1 (to ensure that the corrected dead-time is positive). The physical meaning of the dead-time correction formula is that when the duty ratio D of the continuous zero-current period is larger (the current discontinuity is more severe), the initial dead-time is attenuated and corrected through the (1 - k×D) term, so that the adaptive dead-time decreases appropriately as the discontinuity degree increases, to reduce the ineffective dead-time waiting during the current interruption period and optimize the action timing of the switching device. Among them, the dead-time correction coefficient k is a calibration parameter used to quantify the influence degree of the duty ratio of the continuous zero-current period on the dead-time. The current discontinuous characteristic refers to the working state characteristic that there is a continuous zero-current period in the current under light load. The adaptive dead-time refers to the dead-time that can adapt to the current discontinuous characteristic and achieve the optimal switching control effect; Finally, use a well-known signal synthesis algorithm to integrate the adjusted rising-edge trigger moment, falling-edge turn-off moment, and adaptive dead-time in time sequence, and generate a complete signal including the rising edge, falling edge, and time-sequence dead-time in the format of the preset power correction signal waveform as the power correction signal with adaptive dead-time. The signal synthesis algorithm refers to a well-known signal processing algorithm for integrating multiple time-sequence parameters to generate a complete control signal.;

[0037] It should be noted that the power correction signal in this application refers to a power correction signal whose rising and falling edges are both adjusted and include an adaptive dead time. In the power correction of a rectifier power supply module, a single rising edge adjustment can only correct the fundamental phase lag of the input current and cannot cope with the harmonic distortion caused by current switching spikes. A single falling edge adjustment can only focus on harmonic suppression and is difficult to accurately compensate for phase deviation. However, in the discontinuous current mode, the input current has both fundamental phase lag and multi-frequency harmonic distortion caused by switching spikes. It is necessary to use two edges to carry different correction functions to achieve comprehensive optimization. By determining the power correction signal... The key feature is that by carrying the phase calibration requirement corresponding to the feedforward compensation coefficient at the rising edge trigger time, the phase compensation amount is converted into a time offset and superimposed on the reference rising edge time, so as to achieve precise phase synchronization between the input current fundamental wave and the input voltage fundamental wave. By carrying the harmonic suppression requirement corresponding to the feedback suppression weight at the falling edge turn-off time, the turn-off sequence is adjusted according to the duty cycle correction amount of each harmonic, and high-energy harmonics are specifically suppressed, thereby avoiding the common-mode conduction of the switching device, reducing the loss caused by ineffective dead-time waiting, and ultimately enabling the power switching device to obtain the optimal switching sequence and duty cycle adapted to the current discontinuous mode, so as to achieve power factor correction.

[0038] In step S105, the power correction signal controls the on-time and duty cycle of the power switching device to perform power correction on the input current waveform.

[0039] In some embodiments, the power correction of the input current waveform by controlling the on-time and duty cycle of the power switching device through the power correction signal is achieved by the following steps: The power correction signal is converted into a switching drive signal for the power switching device; The power switching device is controlled to turn on according to the adjusted turn-on timing and turn off according to the adjusted duty cycle based on the switch drive signal. Monitor the actual waveform of the input current after the power switching device operates; The actual waveform of the input current is compared with the preset reference current waveform to obtain the current correction deviation; The on-time and duty cycle of the switch drive signal are continuously adjusted based on the current correction deviation to complete the power correction of the input current waveform.

[0040] In specific implementation, firstly, the power correction signal is connected to a level conversion chip to convert its amplitude into a level signal adapted to the control threshold of the power switching device. Then, the converted level signal is input to a power amplifier circuit composed of transistors. The amplified signal's driving capability meets the conduction drive requirements of the power switching device, and the output signal is the switching drive signal of the power switching device. The switching drive signal refers to the electrical signal that controls the power switching device to turn on and off. Secondly, when the switching drive signal is high, the power switching device is triggered to turn on, and the turn-on time follows the adjusted conduction sequence (i.e., the switching...). The power switch is turned off when the drive signal is low (corresponding to the rising edge of the drive signal). The proportion of the on-time within the switching cycle follows an adjusted duty cycle (i.e., the ratio of the time the drive signal remains high within a single switching cycle to the total time of that switching cycle). The adjusted on-time sequence refers to the time sequence at which the power switch should begin to conduct. The adjusted duty cycle is the ratio of the on-time of the power switch to the total time of the switching cycle. Furthermore, a Hall current sensor is used to monitor the actual waveform of the input current after the power switch operates. This refers to the actual electrical signal waveform of the input current changing over time after the power switching device operates. Then, an analog-to-digital converter (ADC) discretizes and samples the actual input current waveform and the preset reference current waveform to obtain their digital sampling sequences. A point-by-point subtraction algorithm is then used to subtract the sampled values ​​at corresponding moments in the two digital sampling sequences, resulting in a difference sequence, which is the current correction deviation. The preset reference current waveform refers to a pre-set ideal input current waveform that achieves optimal power correction. The current correction deviation is the quantized result of the difference between the actual input current waveform and the preset reference current waveform. Finally, a proportional-integral (PI) control algorithm is used to continuously adjust the conduction timing and duty cycle of the switching drive signal based on the current correction deviation. Specifically, the current correction deviation is used as the input to the PI controller. The proportional element of the PI controller amplifies and adjusts the deviation in real time, while the integral element eliminates the accumulated deviation, outputting timing and duty cycle adjustments. These two adjustments are then superimposed on the conduction moment and conduction time of the original switching drive signal, respectively, to achieve continuous optimization of the switching drive signal until the current correction deviation is reduced to the acceptable range recognized in the field, thus completing the power correction of the input current waveform.

[0041] It should be noted that in this application, power correction refers to the process of adjusting control parameters to make the input current waveform approach the preset reference current waveform, thereby improving the power factor and reducing the harmonic distortion rate, which will not be elaborated here.

[0042] In another aspect, in some embodiments, this application provides a power correction system for a rectifier power supply module, with reference to... Figure 3The figure is a schematic diagram of the power correction system of a rectifier power supply module according to some embodiments of this application. The power correction system of the rectifier power supply module includes: a monitoring module 201, a processing module 202, and an execution module 203, which are described below: Monitoring module 201, in this application, is mainly used to monitor the voltage phase signal and input current waveform on the input side of the target rectifier power supply module; Processing module 202, in this application, is mainly used to identify the current discontinuity mode of the target rectifier power supply module under light load conditions based on the voltage phase signal and the input current waveform, and to calculate the phase lag of the input current fundamental wave relative to the input voltage waveform and the harmonic energy distribution caused by the current switching peaks generated by the current discontinuity mode. The processing module 202 is further configured to construct a composite power compensation parameter for the current discontinuous mode based on the phase lag and the harmonic energy distribution. The composite power compensation parameter includes a feedforward compensation coefficient for phase calibration and a feedback suppression weight for harmonic cancellation. In addition, the processing module 202 is also used to determine a power correction signal with adaptive dead time by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectifier power supply module under light load conditions. The execution module 203 in this application is mainly used to control the conduction timing and duty cycle of the power switching device through the power correction signal in order to perform power correction on the input current waveform.

[0043] In addition, this application also provides a computer device, the computer device including a memory and a processor, the memory storing code, and the processor being configured to acquire the code and execute the power correction method of the rectifier power supply module described above.

[0044] In some embodiments, reference Figure 4 The figure is a schematic diagram of the structure of a computer device implementing a power correction method for a rectifier power supply module according to some embodiments of this application. The power correction method for the rectifier power supply module in the above embodiments can be implemented through... Figure 4 The computer device shown is used to implement this, and the computer device includes at least one processor 301, a communication bus 302, a memory 303, and at least one communication interface 304.

[0045] The processor 301 may be a general-purpose central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more devices for controlling the execution of the power correction method of the rectifier power supply module in this application.

[0046] The communication bus 302 can be used to transmit information between the aforementioned components.

[0047] The memory 303 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disks or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory 303 may exist independently and be connected to the processor 301 via the communication bus 302. The memory 303 may also be integrated with the processor 301.

[0048] The memory 303 stores program code for executing the scheme of this application, and its execution is controlled by the processor 301. The processor 301 executes the program code stored in the memory 303. The program code may include one or more software modules. In the above embodiments, the determination of the power correction method of the rectifier power supply module can be implemented by the processor 301 and one or more software modules in the program code in the memory 303.

[0049] Communication interface 304 uses any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.

[0050] In a specific implementation, as one example, a computer device may include multiple processors, each of which may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. Here, a processor may refer to one or more devices, circuits, and / or processing cores used to process data (e.g., computer program instructions).

[0051] The aforementioned computer device can be a general-purpose computer device or a special-purpose computer device. In specific implementations, the computer device can be a desktop computer, a portable computer, a network server, a handheld digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, or an embedded device. This application does not limit the type of computer device.

[0052] In addition, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the power correction method of the rectifier power supply module described above.

[0053] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0054] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A power correction method for a rectifier power supply module, characterized in that, Includes the following steps: Monitor the voltage phase signal and input current waveform on the input side of the target rectifier power supply module; Based on the voltage phase signal and the input current waveform, the current discontinuity mode of the target rectifier power module under light load conditions is identified, and the phase lag of the input current fundamental wave relative to the input voltage waveform and the harmonic energy distribution caused by the current switching spikes generated by the current discontinuity mode are calculated. Based on the phase lag and the harmonic energy distribution, a composite power compensation parameter for the discontinuous current mode is constructed. The composite power compensation parameter includes a feedforward compensation coefficient for phase calibration and a feedback suppression weight for harmonic cancellation. The power correction signal with adaptive dead time is determined by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectifier power supply module under light load conditions. The power correction signal controls the on-time and duty cycle of the power switching device to correct the power of the input current waveform.

2. The method as described in claim 1, characterized in that, The identification of the current discontinuity mode of the target rectifier power module under light load conditions based on the voltage phase signal and the input current waveform specifically includes: The voltage phase signal and the input current waveform are filtered and preprocessed to obtain a smoothed voltage phase signal and a smoothed current waveform; The zero-crossing time of the input current is extracted based on the smoothed current waveform; Multiple switching cycle reference time periods are determined based on the smoothed voltage phase signal; Within each switching cycle reference period, the smooth current waveform is judged to have a continuous zero current period based on the zero-crossing time; The duty cycle of the continuous zero-current period within a series of consecutive switching cycle reference periods is statistically analyzed. When the duty cycle of the continuous zero-current period within a series of consecutive switching cycle reference periods exceeds the preset discontinuity threshold, the target rectifier power supply module is determined to be in discontinuous current mode.

3. The method as described in claim 1, characterized in that, The calculation of the phase lag of the input current fundamental wave relative to the input voltage waveform generated by the discontinuous current mode and the harmonic energy distribution caused by current switching spikes specifically includes: Based on the reference time period of the switching cycle corresponding to the current discontinuous mode, the fundamental phase of the input voltage and the fundamental phase of the input current are extracted. Calculate the difference between the fundamental phase of the input current and the fundamental phase of the input voltage to obtain the phase lag of the input current fundamental phase relative to the input voltage waveform; Fourier decomposition is performed on the input current waveform during the reference period of the switching cycle to obtain the harmonic components corresponding to the current switching peaks. The corresponding harmonic energy is calculated based on the amplitude of each harmonic component, forming the harmonic energy distribution caused by the current switching peak.

4. The method as described in claim 1, characterized in that, The composite power compensation parameters for discontinuous current mode, constructed based on the phase lag and the harmonic energy distribution, specifically include: Based on the mapping relationship between the phase hysteresis and the preset phase-compensation coefficient, the feedforward compensation coefficient for phase calibration is calculated; The proportion of each harmonic energy is analyzed based on the harmonic energy distribution, and the feedback suppression weight for harmonic cancellation is calculated using a harmonic suppression algorithm. The feedforward compensation coefficient and the feedback suppression weight are combined to form a composite power compensation parameter for discontinuous current mode.

5. The method as described in claim 1, characterized in that, The power correction signal with adaptive dead time is determined by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectifier power supply module under light load conditions. Specifically, this includes: Extract the feedforward compensation coefficient and feedback suppression weight from the composite power compensation parameters; The rising edge trigger time of the power correction signal is adjusted based on the feedforward compensation coefficient. The falling edge turn-off time of the power correction signal is adjusted based on the feedback suppression weight; The initial dead time is calculated based on the time interval between the rising edge trigger time and the falling edge turn-off time. The initial dead time is corrected by the current discontinuity characteristics of the target rectifier power supply module under light load conditions to obtain the adaptive dead time. The rising edge trigger time, falling edge turn-off time, and adaptive dead time are integrated and adjusted to generate a power correction signal with adaptive dead time.

6. The method as described in claim 1, characterized in that, The voltage phase signal at the input side of the target rectifier power module is monitored by a voltage sampling circuit connected to the target rectifier power module.

7. The method as described in claim 1, characterized in that, The input current waveform on the input side of the target rectifier power module is monitored by a current sensing element connected to the target rectifier power module.

8. A power correction system for a rectifier power supply module, used to execute the power correction method for a rectifier power supply module as described in any one of claims 1 to 7, characterized in that, The system includes: The monitoring module is used to monitor the voltage phase signal and input current waveform on the input side of the target rectifier power supply module; The processing module is used to identify the current discontinuity mode of the target rectifier power supply module under light load conditions based on the voltage phase signal and the input current waveform, and to calculate the phase lag of the input current fundamental wave relative to the input voltage waveform and the harmonic energy distribution caused by the current switching spikes generated by the current discontinuity mode. The processing module is further configured to construct composite power compensation parameters for the current discontinuous mode based on the phase lag and the harmonic energy distribution. The composite power compensation parameters include a feedforward compensation coefficient for phase calibration and a feedback suppression weight for harmonic cancellation. The processing module is also used to determine a power correction signal with adaptive dead time by combining the composite power compensation parameters with the current discontinuity characteristics of the target rectifier power supply module under light load conditions. The execution module is used to control the on-time and duty cycle of the power switching device through the power correction signal in order to perform power correction on the input current waveform.

9. A computer device, characterized in that, The computer device includes a memory and a processor, the memory storing code, and the processor being configured to retrieve the code and execute the power correction method for the rectifier power module as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the power correction method for the rectifier power supply module as described in any one of claims 1 to 7.

Images