A constant current frequency conversion dimming method and system based on bus voltage coordinated regulation

Abstract

This invention provides a constant current variable frequency dimming method and system based on bus voltage coordinated regulation, relating to the field of navigation lighting control technology. The method includes: acquiring an input AC voltage signal and using a rectifier topology to perform active rectification processing on the input AC voltage signal, outputting a DC intermediate voltage signal; employing a bus voltage regulation model to perform bus boost regulation on the DC intermediate voltage signal, outputting a DC bus voltage signal; inputting the DC bus voltage signal to a full-bridge inverter circuit, and using a PWM modulation algorithm to invert the DC bus voltage signal to generate a variable frequency AC voltage signal; sampling the output current signal in real time and calculating the current error, and using a current closed-loop control mechanism based on the current error to dynamically adjust the variable frequency AC voltage signal, generating a variable frequency constant current signal; and using the variable frequency constant current signal to drive the navigation lights to adjust the light intensity, thereby achieving adjustable output frequency, high constant current accuracy, and improved system efficiency and dimming stability.

Description

Technical Field

[0001] This invention relates to the field of navigation lighting control technology, and in particular to a constant current frequency conversion dimming method and system based on bus voltage coordinated regulation. Background Technology

[0002] As airport navigation lighting systems continue to evolve towards high-precision dimming and complex operating environments, the power supply system for navigation lights needs to stably output multiple levels of light intensity under different weather conditions and operating scenarios to ensure the safety of aircraft takeoff and landing.

[0003] However, existing navigation lighting dimming technologies mostly rely on traditional constant current dimming methods. Based on a fixed input power supply, they adjust the current through simple rectification and inverter structures, making flexible frequency conversion control difficult. Furthermore, the traditional single-phase input method results in a large current in the rectifier topology, easily leading to increased system losses and three-phase load imbalance. Current technologies lack effective bus voltage regulation after rectification, resulting in significant fluctuations in the DC bus voltage signal, further affecting the stability of the frequency conversion AC voltage signal and the accuracy of the frequency conversion constant current signal. Existing technologies also lack dynamic response capabilities under load fluctuations or changes in operating conditions, and have poor light intensity adjustment accuracy, failing to meet the requirements for high stability and high precision dimming.

[0004] Therefore, it is necessary to provide a constant current frequency conversion dimming method and system based on bus voltage coordinated regulation to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a constant current frequency conversion dimming method and system based on bus voltage coordinated regulation, which solves the problems of three-phase input imbalance, insufficient bus voltage stability, inability to independently adjust output frequency, and poor dimming accuracy.

[0006] This invention provides a constant current frequency conversion dimming method based on bus voltage coordinated regulation, the method comprising: The input AC voltage signal is acquired, and the corresponding rectifier topology is called to perform active rectification processing on the input AC voltage signal to output a DC intermediate voltage signal. The DC intermediate voltage signal is boosted and controlled using a bus voltage regulation model to output a DC bus voltage signal. The DC bus voltage signal is input to the full-bridge inverter circuit, and the DC bus voltage signal is inverted using a PWM modulation algorithm to generate a frequency-converted AC voltage signal. The output current signal is sampled in real time and the current error is calculated. Based on the current error, the frequency conversion AC voltage signal is dynamically adjusted using a current closed-loop control mechanism. The adjusted variable frequency AC voltage signal is input to the navigation light control circuit, and the variable frequency constant current signal is output to drive the navigation light to adjust the light intensity.

[0007] Preferably, acquiring the input AC voltage signal specifically includes: The input AC voltage signal is acquired and subjected to moving average filtering to obtain the effective value of the input AC voltage. A zero-crossing detection algorithm is used to obtain the zero-crossing time sequence of the input AC voltage signal, and the phase difference of the input AC voltage is calculated based on the zero-crossing time sequence; A three-phase effective value threshold and a three-phase phase difference condition are preset. If the effective value of the input AC voltage is greater than or equal to the three-phase effective value threshold and the phase difference of the input AC voltage satisfies the three-phase phase difference condition, then the input AC voltage signal is determined to be a three-phase AC voltage signal. A preset single-phase effective value threshold is set. When only one input AC voltage effective value is detected that is greater than or equal to the single-phase effective value threshold, and the phase difference of the input AC voltage does not meet the three-phase phase difference condition, the input AC voltage signal is determined to be a single-phase AC voltage signal.

[0008] Preferably, for the three-phase AC voltage signal, a three-phase Vienna rectifier topology is used; for the single-phase AC voltage signal, a bridgeless PFC rectifier topology is used.

[0009] Preferably, the single-phase AC voltage signal is actively rectified using the bridgeless PFC rectifier topology to output the DC intermediate voltage signal, specifically including: An EMI filter circuit is used to suppress interference in the single-phase AC voltage signal to obtain the filtered single-phase AC voltage signal, which is then input to the bridgeless PFC rectifier topology. Based on the filtered single-phase AC voltage signal, the first inductor current of the first boost inductor L1 in the bridgeless PFC rectifier topology is acquired. The second inductor current of the second boost inductor L2 When the instantaneous value of the single-phase AC voltage signal is greater than 0, the single-phase AC voltage signal is determined to be in the positive half-cycle, and the positive half-cycle current error value is calculated. When the instantaneous value of the single-phase AC voltage signal is less than 0, the single-phase AC voltage signal is determined to be in the negative half-cycle, and the negative half-cycle current error value is calculated. In the formula, Indicates the reference value for the inner current loop; The single-phase duty cycle D(t) is calculated using the average current mode control algorithm of the PFC control chip, and the corresponding calculation formula is as follows: In the formula, Indicates the proportional gain coefficient of the inner current loop; This represents the inner loop integral gain coefficient of the current. When the single-phase AC voltage signal is in the positive half-cycle, the value is taken as... , When the single-phase AC voltage signal is in the negative half-cycle, the value is taken as... ; t represents a continuous-time variable; The single-phase AC voltage signal is converted based on the single-phase duty cycle D(t) to output the DC intermediate voltage signal. In the formula, This represents the effective value of a single-phase AC voltage.

[0010] Preferably, the three-phase AC voltage signal is actively rectified using the three-phase Vienna rectifier topology to output the DC intermediate voltage signal, specifically including: Using EMI filter circuits to filter three-phase AC voltage signals Interference suppression processing is performed to obtain the filtered three-phase AC voltage signal. And input to the three-phase Vienna rectifier topology; Obtain the inner loop reference value of phase a current. b-phase current inner loop reference value c-phase current inner loop reference value The inductance current of phase a of the boost inductor in the three-phase bridge arm of the three-phase Vienna rectifier topology is collected. b-phase inductor current c-phase inductor current The error value of phase a current is calculated using an inner current loop comparator. b-phase current error value c-phase current error value The corresponding calculation formula is as follows: ; Based on the phase a current error value The error value of phase b current The c-phase current error value Calculate the duty cycle of each of the three phases. ; Based on the three-phase duty cycle The three-phase AC voltage signal is converted to output the DC intermediate voltage signal. In the formula, This represents the effective value of the AC voltage in phase a, phase b, or phase c. Indicates the duty cycle of the three-phase operation. The average value.

[0011] Preferably, the step of using a bus voltage regulation model to boost and regulate the DC intermediate voltage signal to output a DC bus voltage signal specifically includes: Based on DC intermediate voltage signal The bus voltage error value is calculated using an outer-loop voltage comparator. In the formula, Indicates the reference value of the bus voltage; The voltage error value is controlled by the voltage outer loop PI controller. Perform proportional-integral calculations to generate the current regulation coefficient. In the formula, This represents the voltage outer loop proportional gain coefficient; This represents the voltage outer loop integral gain coefficient; The current regulation coefficient is multiplied by the instantaneous value of the input AC voltage to generate an input current reference value. The actual input current value is acquired in real time, and the difference between the input current reference value and the actual input current value is calculated using a current inner-loop comparator to obtain the input current error value. ; The input current error value The input current is adjusted by the inner loop PI controller, and the output duty cycle is determined. ; The duty cycle The input is fed to the pulse width modulation generator for current modulation carrier comparison, generating a high-frequency switch drive signal, and driving the power switch to control the boost inductor to store energy during the power switch's on period and release energy during the power switch's off period; The bus capacitor receives the released energy and performs integration and filtering to obtain the DC bus voltage signal.

[0012] Preferably, the step of inputting the DC bus voltage signal to the full-bridge inverter circuit and using a PWM modulation algorithm to invert the DC bus voltage signal to generate a frequency-converted AC voltage signal specifically includes: Obtain the optical level control command, call the optical level-frequency mapping table and the optical level-amplitude mapping table to map the optical level control command to the target output frequency and the target AC voltage amplitude respectively, and construct the target AC voltage signal based on the target output frequency and the target AC voltage amplitude; The ratio of the target AC voltage signal to the DC bus voltage signal is calculated to obtain the modulation function. The on-time of the power switch is calculated using a PWM modulation algorithm. The corresponding calculation formula is as follows: In the formula, Indicates the PWM modulation period; Based on the on-time of the power switch The power switch is controlled to reverse the polarity and modulate the amplitude of the DC bus voltage signal to generate the frequency-converted AC voltage signal.

[0013] Preferably, the power switch is controlled to perform polarity reversal and amplitude modulation on the DC bus voltage signal based on the on-time of the power switch, specifically including: The modulation function A comparison operation is performed with a preset high-frequency carrier signal; if the modulation function... If the signal is greater than or equal to the preset high-frequency carrier signal, a PWM modulation signal with a value of 1 is generated, and a power switch transistor turn-on command is output. If the modulation function... If the signal is less than the preset high-frequency carrier signal, then the PWM modulation signal with a value of 0 is generated, and a power switch transistor turn-off command is output. The full-bridge inverter circuit includes a first bridge arm and a second bridge arm; the first bridge arm includes an upper power switch and a lower power switch; the second bridge arm includes an upper power switch and a lower power switch. The polarity of the target AC voltage signal is read. During the positive half-cycle of the target AC voltage signal, the power switch on the first bridge arm and the power switch on the second bridge arm are controlled to conduct according to the PWM modulation signal based on the conduction time of the power switch. During the negative half-cycle of the target AC voltage signal, the power switch on the first bridge arm and the power switch on the second bridge arm are controlled to conduct according to the PWM modulation signal based on the conduction time of the power switch, thereby generating the frequency conversion AC voltage signal. The frequency-modulated AC voltage signal is amplitude-modulated so that the instantaneous value of the frequency-modulated AC voltage is equal to the modulation function. The product of the DC bus voltage signal.

[0014] Preferably, the real-time sampling of the output current signal and calculation of the current error, and the dynamic adjustment of the frequency-controlled AC voltage signal based on the current error using a current closed-loop control mechanism, specifically includes: A preset output current reference value is established. The output current signal is sampled in real time, and the difference between the output current reference value and the output current signal is calculated to generate a current error. ; Based on the current error The current closed-loop control mechanism is used to correct the modulation function, and a corrected modulation function is generated. The corresponding calculation formula is as follows: In the formula, This represents the proportional gain coefficient of the current loop; This represents the current loop integral gain coefficient; Based on the modified modulation function The PWM modulation signal is regenerated and the on-time of the power switch is adjusted. The frequency conversion AC voltage signal is dynamically adjusted and input to the navigation light control circuit. The frequency conversion constant current signal is output and the navigation light is driven to adjust the light intensity.

[0015] A constant current frequency conversion dimming system based on bus voltage coordinated regulation, the system comprising: An active rectifier module is used to acquire an input AC voltage signal and call the corresponding rectifier topology to perform active rectification processing on the input AC voltage signal to output a DC intermediate voltage signal. The bus boost module is used to boost and regulate the DC intermediate voltage signal using a bus voltage regulation model, and output a DC bus voltage signal. The frequency converter module is used to input the DC bus voltage signal to the full-bridge inverter circuit, and to perform inversion processing on the DC bus voltage signal using a PWM modulation algorithm to generate a frequency converter AC voltage signal. The constant current control module is used to sample the output current signal in real time and calculate the current error. Based on the current error, a current closed-loop control mechanism is used to dynamically adjust the frequency conversion AC voltage signal. The light intensity adjustment module is used to input the adjusted frequency-converted AC voltage signal to the navigation light control circuit, output a frequency-converted constant current signal, and drive the navigation light to adjust the light intensity.

[0016] Compared with existing technologies, the constant current frequency conversion dimming method and system based on bus voltage coordinated regulation provided by the present invention has the following beneficial effects: This invention acquires an input AC voltage signal and uses the corresponding rectifier topology to perform active rectification processing on the input AC voltage signal, outputting a DC intermediate voltage signal. A bus voltage regulation model is used to boost and regulate the DC intermediate voltage signal, outputting a DC bus voltage signal. The DC bus voltage signal is input to a full-bridge inverter circuit, where a PWM modulation algorithm is used to invert the DC bus voltage signal, generating a frequency-converted AC voltage signal. The output current signal is sampled in real time, and the current error is calculated. Based on the current error, a current closed-loop control mechanism is used to dynamically adjust the frequency-converted AC voltage signal. The adjusted frequency-converted AC voltage signal is input to the navigation light control circuit, outputting a frequency-converted constant current signal to drive the navigation lights for brightness adjustment. This achieves adjustable output frequency, high constant current accuracy, and improved system efficiency and dimming stability.

[0017] This invention achieves dynamic switching of rectification methods by identifying single-phase or three-phase input AC voltage signals and matching them with bridgeless PFC rectifier topologies or three-phase Vienna rectifier topologies, thereby improving the stability of the DC bus voltage signal and solving the problem of three-phase imbalance. This invention achieves precise boost and voltage regulation control by coordinating the voltage outer loop and current inner loop to modulate the DC bus voltage signal, reducing conduction losses and device thermal stress under the same power conditions. This invention flexibly converts the DC bus voltage signal into a frequency-converting AC voltage signal through a PWM modulation algorithm, achieving precise conduction control of the power switching transistors. This completely decouples the output frequency from the grid frequency of the input AC voltage signal, enhancing the flexibility and adaptability of beam intensity adjustment for navigation lights. This invention performs real-time correction of the modulation function, improving the output accuracy and dynamic response capability of the frequency-converting constant current signal, dynamically compensating for current deviations caused by load fluctuations and parameter drift, and achieving synergistic optimization of high-precision frequency-converting constant current signals and wide-range frequency-converting dimming, significantly improving the operational stability and reliability of navigation lights. Attached Figure Description

[0018] Figure 1 A flowchart of a constant current frequency conversion dimming method based on bus voltage coordinated regulation is provided in an embodiment of the present invention; Figure 2 A system block diagram of a constant current frequency conversion dimming system based on bus voltage coordinated regulation is provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 The diagram shown is a flowchart of a constant current frequency conversion dimming method based on bus voltage coordinated regulation provided by an embodiment of the present invention. Figure 1The execution entity of the method shown can be a software and / or hardware device. The execution entity of this application can include, but is not limited to, at least one of the following: user equipment, network equipment, etc. User equipment can include, but is not limited to, computers, smartphones, personal digital assistants (PDAs), and the aforementioned electronic devices. Network equipment can include, but is not limited to, a single network server, a server group consisting of multiple network servers, or a cloud based on cloud computing consisting of a large number of computers or network servers. Cloud computing is a type of distributed computing, consisting of a super virtual computer composed of a group of loosely coupled computers. This embodiment does not limit this. Steps S1 to S5 are detailed as follows: S1, acquire the input AC voltage signal, and call the corresponding rectifier topology to perform active rectification processing on the input AC voltage signal to output a DC intermediate voltage signal; The acquisition of the input AC voltage signal specifically includes: The input AC voltage signal is acquired and subjected to moving average filtering to obtain the effective value of the input AC voltage. A zero-crossing detection algorithm is used to obtain the zero-crossing time sequence of the input AC voltage signal, and the phase difference of the input AC voltage is calculated based on the zero-crossing time sequence; A three-phase effective value threshold and a three-phase phase difference condition are preset. If the effective value of the input AC voltage is greater than or equal to the three-phase effective value threshold and the phase difference of the input AC voltage satisfies the three-phase phase difference condition, then the input AC voltage signal is determined to be a three-phase AC voltage signal. A preset single-phase effective value threshold is set. When only one input AC voltage effective value is detected that is greater than or equal to the single-phase effective value threshold, and the phase difference of the input AC voltage does not meet the three-phase phase difference condition, the input AC voltage signal is determined to be a single-phase AC voltage signal.

[0021] Among them, the input AC voltage signal refers to the AC power source obtained from the public power grid, which is divided into single-phase AC voltage signal and three-phase AC voltage signal, and is the power input source for adjusting the brightness of navigation lights.

[0022] Because the power supply environment of airport navigation dimming systems is complex and commonly suffers from problems such as grid voltage fluctuations, harmonic interference, and phase shifts, it is necessary to first identify the number of phases and phase difference of the input AC voltage signal, and then match the corresponding rectifier topology to ensure rectification efficiency, power factor, and stability of the DC intermediate voltage signal.

[0023] A preset number of sampling points within a sampling period is selected as the sliding window length. Window averaging is performed on the continuously sampled input AC voltage signals to obtain the effective value of the input AC voltage, filtering out high-frequency noise and random interference. A zero-crossing detection algorithm detects the instantaneous points when the input AC voltage signal transitions from the positive half-cycle to the negative half-cycle or vice versa, determining the waveform period boundary of the input AC voltage signal and forming a zero-crossing time sequence. Each zero-crossing time corresponds to a point where the instantaneous value of the input AC voltage is zero. Using zero-crossing times of the same type as a reference, the time difference between the zero-crossing times of input AC voltage signals of different phases is calculated. Based on the ratio of the time difference to the period of the input AC voltage signal, multiplied by 360°, the time difference is converted into a phase angle, thus obtaining the phase difference of the input AC voltage.

[0024] The three-phase effective value threshold refers to the lower limit parameter of the effective voltage value used to determine the presence of a three-phase AC voltage signal. The single-phase effective value threshold refers to the lower limit parameter of the effective voltage value used to determine the presence of a single-phase AC voltage signal. The three-phase phase difference condition refers to the phase difference between the input AC voltages of the three phases being close to 120°, and is set according to the actual power grid fluctuations. If three input AC voltage effective values ​​are detected simultaneously, and the effective value of each input AC voltage is greater than or equal to the three-phase effective value threshold, and the three-phase phase difference condition is met, then a three-phase AC voltage signal is identified. If only one input AC voltage effective value is detected and that one input AC voltage effective value is greater than or equal to the single-phase effective value threshold, or if three input AC voltage effective values ​​are detected but the phase difference does not meet the three-phase phase difference condition, then a single-phase AC voltage signal is identified. This allows for the determination of the phase relationship between the input AC voltage signals of different phases and the identification of the type of input AC voltage signal.

[0025] For the three-phase AC voltage signal, a three-phase Vienna rectifier topology is used; for the single-phase AC voltage signal, a bridgeless PFC rectifier topology is used.

[0026] A rectifier topology refers to a power conversion circuit structure that converts an input AC voltage signal into a DC intermediate voltage signal. It includes bridgeless PFC rectifier topology or three-phase Vienna rectifier topology, and is used to reduce conduction losses and solve the problem of three-phase load imbalance.

[0027] When the signal is determined to be a single-phase AC voltage signal, a bridgeless PFC rectifier topology is activated. The alternating conduction of the dual boost inductors and power switches symmetrically controls the single-phase AC voltage signal during the positive and negative half-cycles, ensuring that the input current is in phase with the single-phase AC voltage signal, thereby correcting the power factor and reducing rectification losses. When the signal is determined to be a three-phase AC voltage signal, a three-phase Vienna rectifier topology is activated. The three-phase bridge arm current control achieves three-phase input current balance and DC bus voltage signal stability regulation. Both rectifier topologies output a stable DC intermediate voltage signal under the modulation of the PFC control chip.

[0028] The single-phase AC voltage signal is actively rectified using the bridgeless PFC rectifier topology to output the DC intermediate voltage signal, specifically including: An EMI filter circuit is used to suppress interference in the single-phase AC voltage signal to obtain the filtered single-phase AC voltage signal, which is then input to the bridgeless PFC rectifier topology. Based on the filtered single-phase AC voltage signal, the first inductor current of the first boost inductor L1 in the bridgeless PFC rectifier topology is acquired. The second inductor current of the second boost inductor L2 When the instantaneous value of the single-phase AC voltage signal is greater than 0, the single-phase AC voltage signal is determined to be in the positive half-cycle, and the positive half-cycle current error value is calculated. When the instantaneous value of the single-phase AC voltage signal is less than 0, the single-phase AC voltage signal is determined to be in the negative half-cycle, and the negative half-cycle current error value is calculated. In the formula, Indicates the reference value for the inner current loop; The single-phase duty cycle D(t) is calculated using the average current mode control algorithm of the PFC control chip, and the corresponding calculation formula is as follows: In the formula, Indicates the proportional gain coefficient of the inner current loop; This represents the inner loop integral gain coefficient of the current. When the single-phase AC voltage signal is in the positive half-cycle, the value is taken as... , When the single-phase AC voltage signal is in the negative half-cycle, the value is taken as... ; t represents a continuous-time variable; The single-phase AC voltage signal is converted based on the single-phase duty cycle D(t) to output the DC intermediate voltage signal. In the formula, This represents the effective value of a single-phase AC voltage.

[0029] The inner current reference value refers to a sinusoidal current reference waveform that is in phase and frequency with the single-phase AC voltage signal. It characterizes the current amplitude and phase trajectory that the inductor current should track under ideal power factor correction conditions. The single-phase duty cycle refers to the PWM modulation control quantity output by the PFC control chip, used to adjust the on-time ratio of the power switch within one switching cycle, thereby controlling the energy storage and release of the first boost inductor L1 and the second boost inductor L2, achieving controllable energy transfer from the single-phase AC voltage signal to the DC intermediate voltage signal. The DC intermediate voltage signal refers to the stable DC voltage formed between the rectifier stage and the bus stage, which reduces the control difficulty of the inverter process.

[0030] Existing technologies employ a single-phase bridge PFC rectifier topology, leading to reduced system efficiency and increased heat dissipation burden. Therefore, a bridgeless PFC rectifier topology is developed to actively rectify single-phase AC voltage signals by eliminating the traditional rectifier bridge structure and using dual boost inductors and power switches working in tandem. This topology includes two boost inductors and two power switches. The first boost inductor, L1, stores and releases the energy of the single-phase AC voltage signal during the positive half-cycle, while the second boost inductor, L2, stores and releases the energy of the single-phase AC voltage signal during the negative half-cycle. They work alternately to continuously boost the voltage throughout the entire cycle. The inductor current refers to the instantaneous current value through the boost inductors, reflecting the energy transfer state of the single-phase AC voltage signal.

[0031] In a bridgeless PFC rectifier topology, the first boost inductor L1 and the second boost inductor L2 operate alternately during the positive and negative half-cycles of a single-phase AC voltage signal. During the positive half-cycle, the first inductor current flows through the first boost inductor L1 and forms a loop with the corresponding power switch; during the negative half-cycle, the second inductor current flows through the second boost inductor L2 and forms a loop with the corresponding power switch. Therefore, it is necessary to separately acquire the two inductor currents and perform closed-loop control.

[0032] Based on the polarity of the single-phase AC voltage signal, the current half-cycle of the single-phase AC voltage signal is determined, and the current error values ​​for the positive and negative half-cycles are calculated. The single-phase duty cycle is then calculated using an average current-mode control algorithm. The proportional gain coefficient of the current inner loop is used to improve dynamic response speed, while the integral gain coefficient of the current inner loop is used to eliminate steady-state errors. Due to the different polarities of the single-phase AC voltage signal, the direction of inductor current transmission changes, resulting in different conduction paths for the power switches. The positive and negative half-cycles are controlled separately using different single-phase duty cycles to maintain the symmetry of the waveforms and phases of the positive and negative half-cycles.

[0033] By utilizing the single-phase conduction duty cycle, a single-phase AC voltage signal is converted into a stable DC intermediate voltage signal. This DC intermediate voltage signal has low ripple characteristics and high stability, and can effectively suppress fluctuations in the single-phase AC voltage signal.

[0034] The three-phase AC voltage signal is actively rectified using the three-phase Vienna rectifier topology to output the DC intermediate voltage signal, specifically including: Using EMI filter circuits to filter three-phase AC voltage signals Interference suppression processing is performed to obtain the filtered three-phase AC voltage signal. And input to the three-phase Vienna rectifier topology; Obtain the inner loop reference value of phase a current. b-phase current inner loop reference value c-phase current inner loop reference value The inductance current of phase a of the boost inductor in the three-phase bridge arm of the three-phase Vienna rectifier topology is collected. b-phase inductor current c-phase inductor current The error value of phase a current is calculated using an inner current loop comparator. b-phase current error value c-phase current error value The corresponding calculation formula is as follows: ; Based on the phase a current error value The error value of phase b current The c-phase current error value Calculate the duty cycle of each of the three phases. ; Based on the three-phase duty cycle The three-phase AC voltage signal is converted to output the DC intermediate voltage signal. In the formula, This represents the effective value of the AC voltage in phase a, phase b, or phase c. Indicates the duty cycle of the three-phase operation. The average value.

[0035] An EMI filter circuit is used to suppress interference in the three-phase AC voltage signal, inhibiting high-frequency interference and electromagnetic noise. The filtered three-phase AC voltage signal is then input to the three input sides of a three-phase Vienna rectifier topology, and closed-loop control is applied to the inductor currents of phases A, B, and C respectively. A current inner-loop comparator compares the reference values ​​of the current inner loop for phases A, B, and C with the actual sampled inductor currents of phases A, B, and C to obtain the current error values ​​for phases A, B, and C respectively. Since the three arms of the three-phase Vienna rectifier topology operate independently, each arm corresponds to one phase of energy conversion. Therefore, it is necessary to separately collect the three-phase inductor currents and calculate the corresponding current error values ​​to ensure that even if the three-phase AC voltage signal of one phase fluctuates, the current of that phase can be independently adjusted, maintaining the symmetry of the three-phase inductor currents.

[0036] The average current mode control algorithm calculates the duty cycle of phases a, b, and c based on the current error values ​​of phases a, b, and c respectively. This is used to adjust the on-time ratio of each bridge arm within a switching cycle, thereby controlling the energy storage and release of the boost inductors of phases a, b, and c, and realizing the controllable transfer of energy from the three-phase AC voltage signal to the DC intermediate voltage signal.

[0037] It should be noted that the three-phase Vienna rectifier topology independently samples and controls the inductor currents of phases a, b, and c, and adjusts the duty cycle of each phase power switch to ensure that the input currents of phases a, b, and c are synchronized with the corresponding three-phase AC voltage signals in phase and proportionally track the corresponding three-phase AC voltage signals in amplitude. This reduces the impact of three-phase imbalance and outputs a stable DC intermediate voltage signal.

[0038] S2, the DC intermediate voltage signal is boosted and controlled using a bus voltage regulation model to output a DC bus voltage signal; The step of using a bus voltage regulation model to boost and regulate the DC intermediate voltage signal to output a DC bus voltage signal specifically includes: Based on DC intermediate voltage signal The bus voltage error value is calculated using an outer-loop voltage comparator. In the formula, Indicates the reference value of the bus voltage; The voltage error value is controlled by the voltage outer loop PI controller. Perform proportional-integral calculations to generate the current regulation coefficient. In the formula, This represents the voltage outer loop proportional gain coefficient; This represents the voltage outer loop integral gain coefficient; The current regulation coefficient is multiplied by the instantaneous value of the input AC voltage to generate an input current reference value. The actual input current value is acquired in real time, and the difference between the input current reference value and the actual input current value is calculated using a current inner-loop comparator to obtain the input current error value. ; The input current error value The input current is adjusted by the inner loop PI controller, and the output duty cycle is determined. ; The duty cycle The input is fed to the pulse width modulation generator for current modulation carrier comparison, generating a high-frequency switch drive signal, and driving the power switch to control the boost inductor to store energy during the power switch's on period and release energy during the power switch's off period; The bus capacitor receives the released energy and performs integration and filtering to obtain the DC bus voltage signal.

[0039] The bus voltage regulation model refers to a boost control model based on dual closed-loop collaborative control of an outer voltage PI controller and an inner current PI controller. The outer voltage PI controller stabilizes the DC bus voltage signal, while the inner current loop achieves sinusoidal tracking of the input current and power factor correction. The DC bus voltage signal refers to the DC voltage output after boosting and stabilizing through the bus voltage regulation model.

[0040] Existing technologies lack bus voltage regulation mechanisms after rectification, resulting in significant fluctuations in the DC intermediate voltage signal. This leads to poor stability of the inverter's output AC voltage signal, making it impossible to simultaneously stabilize the DC bus voltage signal and correct the power factor. The dynamic response capability is insufficient, and problems such as DC bus voltage signal drop, overshoot, and oscillation easily occur when the input AC voltage signal fluctuates or the load changes abruptly. The voltage outer loop comparator monitors the deviation between the DC intermediate voltage signal and the bus voltage reference value, calculating the bus voltage error value. The bus voltage error value is dynamically adjusted through proportional-integral operations. The proportional operation is used to quickly respond to dynamic changes in the bus voltage error value and suppress fluctuations; the integral operation is used to eliminate the bus voltage error value, ensuring that the DC bus voltage signal ultimately stabilizes near the bus voltage reference value. The results of both operations are added together to obtain the current regulation coefficient. Simultaneously, the current regulation coefficient serves as the amplitude reference for the input current, achieving coordinated control between the voltage outer loop and the current inner loop. The current regulation coefficient generated by the voltage outer loop PI controller can dynamically adjust the input current based on the bus voltage error value. Specifically, when the DC intermediate voltage signal is lower than the bus voltage reference value, the current regulation coefficient is increased to increase the input current amplitude and input power, thereby raising the DC bus voltage signal. When the DC intermediate voltage signal is higher than the bus voltage reference value, the current regulation coefficient is decreased to reduce the input current amplitude and input power, thereby lowering the DC bus voltage signal and ultimately ensuring the stability of the DC bus voltage signal.

[0041] The duty cycle output of the inner-loop PI controller is compared with a fixed-frequency carrier signal. Based on the comparison result, a high-frequency switching drive signal for the power switch is generated to regulate the charging and discharging process of the boost inductor, thereby achieving input current shaping and power factor correction. During the power switch's conduction period, the boost inductor and the DC intermediate voltage signal form a closed loop, and the inductor current rises linearly, storing energy. During the turn-off period, the current path is cut off, forcing the boost inductor to release the stored energy to the bus capacitor, thus raising the bus voltage. The bus capacitor receives the energy released by the boost inductor, filtering out high-frequency switching ripple and low-frequency power frequency ripple, resulting in a stable DC bus voltage signal. This effectively solves the problems of large fluctuations in the DC bus voltage signal, low dimming accuracy, low power factor, and insufficient dynamic response capability in existing technologies.

[0042] S3, the DC bus voltage signal is input to the full-bridge inverter circuit, and the DC bus voltage signal is inverted using a PWM modulation algorithm to generate a frequency-converted AC voltage signal; The step of inputting the DC bus voltage signal to the full-bridge inverter circuit and using a PWM modulation algorithm to invert the DC bus voltage signal to generate a frequency-converted AC voltage signal specifically includes: Obtain the optical level control command, call the optical level-frequency mapping table and the optical level-amplitude mapping table to map the optical level control command to the target output frequency and the target AC voltage amplitude respectively, and construct the target AC voltage signal based on the target output frequency and the target AC voltage amplitude; The ratio of the target AC voltage signal to the DC bus voltage signal is calculated to obtain the modulation function. The on-time of the power switch is calculated using a PWM modulation algorithm. The corresponding calculation formula is as follows: In the formula, Indicates the PWM modulation period; Based on the on-time of the power switch The power switch is controlled to reverse the polarity and modulate the amplitude of the DC bus voltage signal to generate the frequency-converted AC voltage signal.

[0043] Among them, the light level control command refers to the target brightness level information input from the airport tower dimming control console or dimming interface, used to control the light intensity level of navigation lights. The frequency-adjustable AC voltage signal refers to an AC output voltage with adjustable frequency and amplitude, used to achieve dimming or load control.

[0044] In existing technologies, the frequency of the output AC voltage signal after inverter processing is bound to the frequency of the input AC voltage signal, which makes it impossible to achieve frequency conversion dimming and difficult to adapt to the frequency conversion dimming requirements of navigation lights. At the same time, traditional inverter circuits lack a compensation mechanism for fluctuations in the DC bus voltage signal. When the DC bus voltage signal fluctuates, the output AC voltage signal will fluctuate accordingly, resulting in poor light intensity adjustment accuracy.

[0045] The optical level control command is analyzed to obtain the optical level index value. This index value is then used to search the optical level-frequency mapping table and the optical level-amplitude mapping table to obtain the corresponding target output frequency and target AC voltage amplitude. Using the target output frequency as the angular frequency and the target AC voltage amplitude as the peak value, a target AC voltage signal is constructed by inputting it into a standard sine wave function. , Indicates the target AC voltage amplitude. This indicates the target output frequency. The optical level control commands are converted into control parameters executable by the full-bridge inverter circuit, effectively achieving precise mapping from the optical level control commands to the target AC voltage signal. This provides a reference standard for PWM modulation, where both the output frequency and AC voltage amplitude are adjustable. Using a pre-stored mapping table significantly shortens the control response time, avoids delays caused by real-time calculations, and improves the real-time performance of the dimming system.

[0046] The modulation function is the ratio of the instantaneous value of the target AC voltage signal to the instantaneous value of the DC bus voltage signal. It reflects the modulation depth of the target output voltage relative to the DC bus voltage. When the DC bus voltage signal increases, the modulation function automatically decreases; when the DC bus voltage signal decreases, the modulation function automatically increases. The modulation function compensates for fluctuations in the DC bus voltage signal in real time, ensuring the stability of the frequency converter AC voltage signal. Mapping the modulation function from the range [-1,1] to the range [0,1] and then multiplying it by the PWM modulation period yields the power switch's on-time. The power switch's on-time refers to the duration the power switch remains in the on state within one PWM modulation period. The PWM modulation period refers to the period of the preset high-frequency carrier signal, which affects the switching frequency of the power switch. The value of the PWM modulation period needs to consider power switch losses, current ripple, etc.

[0047] Based on the on-time of the power switch, the power switch is controlled to perform polarity reversal and amplitude modulation on the DC bus voltage signal, specifically including: The modulation function A comparison operation is performed with a preset high-frequency carrier signal; if the modulation function... If the signal is greater than or equal to the preset high-frequency carrier signal, a PWM modulation signal with a value of 1 is generated, and a power switch transistor turn-on command is output. If the modulation function... If the signal is less than the preset high-frequency carrier signal, then the PWM modulation signal with a value of 0 is generated, and a power switch transistor turn-off command is output. The full-bridge inverter circuit includes a first bridge arm and a second bridge arm; the first bridge arm includes an upper power switch and a lower power switch; the second bridge arm includes an upper power switch and a lower power switch. The polarity of the target AC voltage signal is read. During the positive half-cycle of the target AC voltage signal, the power switch on the first bridge arm and the power switch on the second bridge arm are controlled to conduct according to the PWM modulation signal based on the conduction time of the power switch. During the negative half-cycle of the target AC voltage signal, the power switch on the first bridge arm and the power switch on the second bridge arm are controlled to conduct according to the PWM modulation signal based on the conduction time of the power switch, thereby generating the frequency conversion AC voltage signal. The frequency-modulated AC voltage signal is amplitude-modulated so that the instantaneous value of the frequency-modulated AC voltage is equal to the modulation function. The product of the DC bus voltage signal.

[0048] Among them, polarity reversal refers to changing the polarity of the frequency-converted AC voltage signal by controlling the alternating conduction of power switching transistors in the full-bridge inverter circuit. Amplitude modulation refers to adjusting the amplitude of the frequency-converted AC voltage signal by adjusting the magnitude of the modulation function in real time.

[0049] Within each PWM modulation cycle, the preset high-frequency carrier signal linearly rises from 0 to 1 and then falls back to 0, or linearly rises from 0 to 1 and then instantaneously returns to 0. The modulation function is compared with the instantaneous value of the preset high-frequency carrier signal. If the modulation function is greater than or equal to the preset high-frequency carrier signal, the PWM modulation signal outputs 1; if the modulation function is less than the preset high-frequency carrier signal, the PWM modulation signal outputs 0. In practical applications, polarity detection and bridge arm switching are executed by a timer interrupt program. The switching time is strictly synchronized with the zero-crossing point of the target AC voltage signal to avoid voltage jumps and current surges during polarity switching. A dead time is set between the upper and lower transistors of the same bridge arm. During polarity switching, the current power switch is turned off first, and the dead time is delayed before the other power switch is turned on to prevent shoot-through short circuits. This solves the problems of fixed frequency and uncontrollable polarity of the output AC voltage signal in traditional dimming technology.

[0050] The polarity of the target AC voltage signal is read. During the positive half-cycle, the power switch on the first bridge arm and the power switch on the second bridge arm are turned on according to the PWM modulation signal. During the negative half-cycle, the power switch on the first bridge arm and the power switch on the second bridge arm are turned on according to the PWM modulation signal. By controlling the turn-on and turn-off timing of the four power switches in the full-bridge inverter circuit, the polarity of the frequency conversion AC voltage signal is alternately flipped, generating a frequency conversion AC voltage waveform with alternating positive and negative polarities.

[0051] The above method achieves complete decoupling and wide-range independent adjustment of the frequency of the output variable frequency AC voltage signal and the frequency of the input DC bus voltage signal, while ensuring accurate tracking and modulation of the amplitude of the variable frequency AC voltage signal. It provides a drive power supply with controllable frequency and amplitude for constant current control and brightness adjustment of navigation lights, solving the problems of fixed output AC voltage signal frequency, single dimming mode, and inability to adapt to the new variable frequency dimming requirements of traditional dimming technology.

[0052] S4, Real-time sampling of the output current signal and calculation of the current error, and dynamic adjustment of the frequency conversion AC voltage signal based on the current error using a current closed-loop control mechanism; The real-time sampling of the output current signal and calculation of the current error, and the dynamic adjustment of the frequency-controlled AC voltage signal based on the current error using a current closed-loop control mechanism, specifically include: A preset output current reference value is established. The output current signal is sampled in real time, and the difference between the output current reference value and the output current signal is calculated to generate a current error. ; Based on the current error The current closed-loop control mechanism is used to correct the modulation function, and a corrected modulation function is generated. The corresponding calculation formula is as follows: In the formula, This represents the proportional gain coefficient of the current loop; This represents the current loop integral gain coefficient; Based on the modified modulation function The PWM modulation signal is regenerated and the on-time of the power switch is adjusted. The frequency conversion AC voltage signal is dynamically adjusted and input to the navigation light control circuit. The frequency conversion constant current signal is output and the navigation light is driven to adjust the light intensity.

[0053] The output current signal refers to the instantaneous value of the AC current flowing through the control circuit of the navigation lights. Current error refers to the deviation between the output current reference value and the output current signal, reflecting the degree to which the actual current deviates from the expected current. The frequency-controlled AC voltage signal refers to an AC voltage whose frequency and amplitude are adjustable but have not yet been fine-tuned through a current closed-loop control mechanism.

[0054] Specifically, the equivalent impedance of navigation lights varies with temperature, aging, and power grid fluctuations, and the frequency converter AC voltage signal cannot guarantee a constant output current signal. Therefore, by sampling the output current signal in real time and calculating the current error, a current closed-loop control mechanism is used to dynamically adjust the current error, compensate the modulation function, and generate a corrected modulation function. This dynamically adjusts the frequency converter AC voltage signal, ensuring the output current signal tracks the current reference value, achieving constant current control, and ensuring the consistency and stability of light intensity. The PWM modulation signal is adjusted according to the corrected modulation function. This PWM modulation signal controls the power switching transistors of the full-bridge inverter circuit, adjusting the on and off timing accordingly.

[0055] S5, the adjusted frequency-converted AC voltage signal is input to the navigation light control circuit, and the frequency-converted constant current signal is output to drive the navigation light to adjust the light intensity.

[0056] The regulated variable-frequency AC voltage signal is input to the control circuit of the navigation lights. Under the action of the inductive load of the lights, a current is generated. Due to the real-time correction of the current closed-loop control mechanism, this current is precisely controlled near the output current reference value, forming a variable-frequency constant current signal that drives the navigation lights to emit stable and precise light intensity. This achieves high-precision tracking and rapid dynamic response of the current to the output current reference value, while ensuring the stability of the constant current under load disturbances and parameter drift. It solves the problems of insufficient constant current accuracy, poor light intensity consistency, and slow dynamic response in traditional dimming technology.

[0057] like Figure 2 The diagram shown is a system block diagram of a constant current frequency conversion dimming system based on bus voltage coordinated regulation provided by an embodiment of the present invention. The system includes: An active rectifier module is used to acquire an input AC voltage signal and call the corresponding rectifier topology to perform active rectification processing on the input AC voltage signal to output a DC intermediate voltage signal. The bus boost module is used to boost and regulate the DC intermediate voltage signal using a bus voltage regulation model, and output a DC bus voltage signal. The frequency converter module is used to input the DC bus voltage signal to the full-bridge inverter circuit, and to perform inversion processing on the DC bus voltage signal using a PWM modulation algorithm to generate a frequency converter AC voltage signal. The constant current control module is used to sample the output current signal in real time and calculate the current error. Based on the current error, a current closed-loop control mechanism is used to dynamically adjust the frequency conversion AC voltage signal. The light intensity adjustment module is used to input the adjusted frequency-converted AC voltage signal to the navigation light control circuit, output a frequency-converted constant current signal, and drive the navigation light to adjust the light intensity.

[0058] Figure 2 The system of the illustrated embodiment can be used to perform corresponding operations. Figure 1 The steps in the method embodiments shown are implemented in a similar manner and have similar technical effects, and will not be repeated here.

[0059] An electronic device includes a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor performs the steps of a constant current frequency conversion dimming method based on bus voltage coordinated regulation as described above.

[0060] like Figure 3 The diagram shown is a hardware structure schematic of an electronic device according to an embodiment of the present invention. The electronic device 30 includes: a processor 31, a memory 32, and a computer program; wherein... The memory 32 is used to store the computer program, and the memory may also be flash memory. The computer program is, for example, an application program or functional module that implements the above method.

[0061] Processor 31 is configured to execute the computer program stored in the memory to implement the various steps performed by the device in the above method. For details, please refer to the relevant descriptions in the preceding method embodiments.

[0062] Alternatively, the memory 32 can be either standalone or integrated with the processor 31.

[0063] When the memory 32 is a device independent of the processor 31, the device may further include: Bus 33 is used to connect the memory 32 and the processor 31.

[0064] A readable storage medium storing a computer program, which, when executed by a processor, is used to implement the steps of a constant current frequency conversion dimming method based on bus voltage coordinated control as described above.

[0065] The readable storage medium can be a computer storage medium or a communication medium. A communication medium includes any medium that facilitates the transfer of computer programs from one location to another. A computer storage medium can be any available medium accessible to a general-purpose or special-purpose computer. For example, a readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application-Specific Integrated Circuit (ASIC). Alternatively, the ASIC can be located in a user equipment. Of course, the processor and the readable storage medium can also exist as discrete components in a communication device. The readable storage medium can be a read-only memory (ROM), random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0066] The present invention also provides a program product including executable instructions stored in a readable storage medium. At least one processor of the device can read the executable instructions from the readable storage medium, and the at least one processor executes the executable instructions to cause the device to implement the methods provided in the various embodiments described above.

[0067] In the embodiments of the above-described device, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly manifested as execution by a hardware processor, or execution by a combination of hardware and software modules within the processor.

[0068] Through the above embodiments, this invention acquires an input AC voltage signal and uses the corresponding rectifier topology to perform active rectification processing on the input AC voltage signal, outputting a DC intermediate voltage signal; it then uses a bus voltage regulation model to boost and regulate the DC intermediate voltage signal, outputting a DC bus voltage signal; the DC bus voltage signal is input to a full-bridge inverter circuit, and a PWM modulation algorithm is used to invert the DC bus voltage signal to generate a frequency-converted AC voltage signal; the output current signal is sampled in real time and the current error is calculated; based on the current error, a current closed-loop control mechanism is used to dynamically adjust the frequency-converted AC voltage signal; the adjusted frequency-converted AC voltage signal is input to the navigation light control circuit, outputting a frequency-converted constant current signal to drive the navigation lights for brightness adjustment, thereby achieving adjustable output frequency, high constant current accuracy, and improved system efficiency and dimming stability.

[0069] This invention achieves dynamic switching of rectification methods by identifying single-phase or three-phase input AC voltage signals and matching them with bridgeless PFC rectifier topologies or three-phase Vienna rectifier topologies, thereby improving the stability of the DC bus voltage signal and solving the problem of three-phase imbalance. This invention achieves precise boost and voltage regulation control by coordinating the voltage outer loop and current inner loop to modulate the DC bus voltage signal, reducing conduction losses and device thermal stress under the same power conditions. This invention flexibly converts the DC bus voltage signal into a frequency-converting AC voltage signal through a PWM modulation algorithm, achieving precise conduction control of the power switching transistors. This completely decouples the output frequency from the grid frequency of the input AC voltage signal, enhancing the flexibility and adaptability of beam intensity adjustment for navigation lights. This invention performs real-time correction of the modulation function, improving the output accuracy and dynamic response capability of the frequency-converting constant current signal, dynamically compensating for current deviations caused by load fluctuations and parameter drift, and achieving synergistic optimization of high-precision frequency-converting constant current signals and wide-range frequency-converting dimming, significantly improving the operational stability and reliability of navigation lights.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A constant current frequency conversion dimming method based on bus voltage coordinated regulation, characterized in that, The method includes: The input AC voltage signal is acquired, and the corresponding rectifier topology is called to perform active rectification processing on the input AC voltage signal to output a DC intermediate voltage signal. The DC intermediate voltage signal is boosted and controlled using a bus voltage regulation model to output a DC bus voltage signal. The DC bus voltage signal is input to the full-bridge inverter circuit, and the DC bus voltage signal is inverted using a PWM modulation algorithm to generate a frequency-converted AC voltage signal. The output current signal is sampled in real time and the current error is calculated. Based on the current error, the frequency conversion AC voltage signal is dynamically adjusted using a current closed-loop control mechanism. The adjusted variable frequency AC voltage signal is input to the navigation light control circuit, and the variable frequency constant current signal is output to drive the navigation light to adjust the light intensity.

2. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 1, characterized in that, The acquisition of the input AC voltage signal specifically includes: The input AC voltage signal is acquired and subjected to moving average filtering to obtain the effective value of the input AC voltage. A zero-crossing detection algorithm is used to obtain the zero-crossing time sequence of the input AC voltage signal, and the phase difference of the input AC voltage is calculated based on the zero-crossing time sequence; A three-phase effective value threshold and a three-phase phase difference condition are preset. If the effective value of the input AC voltage is greater than or equal to the three-phase effective value threshold and the phase difference of the input AC voltage satisfies the three-phase phase difference condition, then the input AC voltage signal is determined to be a three-phase AC voltage signal. A preset single-phase effective value threshold is set. When only one input AC voltage effective value is detected that is greater than or equal to the single-phase effective value threshold, and the phase difference of the input AC voltage does not meet the three-phase phase difference condition, the input AC voltage signal is determined to be a single-phase AC voltage signal.

3. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 2, characterized in that, For the three-phase AC voltage signal, a three-phase Vienna rectifier topology is used; for the single-phase AC voltage signal, a bridgeless PFC rectifier topology is used.

4. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 3, characterized in that, The single-phase AC voltage signal is actively rectified using the bridgeless PFC rectifier topology to output the DC intermediate voltage signal, specifically including: An EMI filter circuit is used to suppress interference in the single-phase AC voltage signal to obtain the filtered single-phase AC voltage signal, which is then input to the bridgeless PFC rectifier topology. Based on the filtered single-phase AC voltage signal, the first inductor current of the first boost inductor L1 in the bridgeless PFC rectifier topology is acquired. The second inductor current of the second boost inductor L2 When the instantaneous value of the single-phase AC voltage signal is greater than 0, the single-phase AC voltage signal is determined to be in the positive half-cycle, and the positive half-cycle current error value is calculated. When the instantaneous value of the single-phase AC voltage signal is less than 0, the single-phase AC voltage signal is determined to be in the negative half-cycle, and the negative half-cycle current error value is calculated. In the formula, Indicates the reference value for the inner current loop; The single-phase duty cycle D(t) is calculated using the average current mode control algorithm of the PFC control chip, and the corresponding calculation formula is as follows: In the formula, Indicates the proportional gain coefficient of the inner current loop; This represents the inner loop integral gain coefficient of the current. When the single-phase AC voltage signal is in the positive half-cycle, the value is taken as... , When the single-phase AC voltage signal is in the negative half-cycle, the value is taken as... ; t represents a continuous-time variable; The single-phase AC voltage signal is converted based on the single-phase duty cycle D(t) to output the DC intermediate voltage signal. In the formula, This represents the effective value of a single-phase AC voltage.

5. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 3, characterized in that, The three-phase AC voltage signal is actively rectified using the three-phase Vienna rectifier topology to output the DC intermediate voltage signal, specifically including: Using EMI filter circuits to filter three-phase AC voltage signals Interference suppression processing is performed to obtain the filtered three-phase AC voltage signal. And input to the three-phase Vienna rectifier topology; Obtain the inner loop reference value of phase a current. b-phase current inner loop reference value c-phase current inner loop reference value The inductance current of phase a of the boost inductor in the three-phase bridge arm of the three-phase Vienna rectifier topology is collected. b-phase inductor current c-phase inductor current The error value of phase a current is calculated using an inner current loop comparator. b-phase current error value c-phase current error value The corresponding calculation formula is as follows: ； Based on the phase a current error value The error value of phase b current The c-phase current error value Calculate the duty cycle of each of the three phases. ; Based on the three-phase duty cycle The three-phase AC voltage signal is converted to output the DC intermediate voltage signal. In the formula, This represents the effective value of the AC voltage in phase a, phase b, or phase c. Indicates the duty cycle of the three-phase operation. The average value.

6. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 1, characterized in that, The step of using a bus voltage regulation model to boost and regulate the DC intermediate voltage signal to output a DC bus voltage signal specifically includes: Based on DC intermediate voltage signal The bus voltage error value is calculated using an outer-loop voltage comparator. In the formula, Indicates the reference value of the bus voltage; The voltage error value is controlled by the voltage outer loop PI controller. Perform proportional-integral calculations to generate the current regulation coefficient. In the formula, This represents the voltage outer loop proportional gain coefficient; This represents the voltage outer loop integral gain coefficient; The current regulation coefficient is multiplied by the instantaneous value of the input AC voltage to generate an input current reference value. The actual input current value is acquired in real time, and the difference between the input current reference value and the actual input current value is calculated using a current inner-loop comparator to obtain the input current error value. ; The input current error value The input current is adjusted by the inner loop PI controller, and the output duty cycle is determined. ; The duty cycle The input is fed to the pulse width modulation generator for current modulation carrier comparison, generating a high-frequency switch drive signal, and driving the power switch to control the boost inductor to store energy during the power switch's on period and release energy during the power switch's off period; The bus capacitor receives the released energy and performs integration and filtering to obtain the DC bus voltage signal.

7. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 6, characterized in that, The step of inputting the DC bus voltage signal to the full-bridge inverter circuit and using a PWM modulation algorithm to invert the DC bus voltage signal to generate a frequency-converted AC voltage signal specifically includes: Obtain the optical level control command, call the optical level-frequency mapping table and the optical level-amplitude mapping table to map the optical level control command to the target output frequency and the target AC voltage amplitude respectively, and construct the target AC voltage signal based on the target output frequency and the target AC voltage amplitude; The ratio of the target AC voltage signal to the DC bus voltage signal is calculated to obtain the modulation function. The on-time of the power switch is calculated using a PWM modulation algorithm. The corresponding calculation formula is as follows: In the formula, Indicates the PWM modulation period; Based on the on-time of the power switch The power switch is controlled to reverse the polarity and modulate the amplitude of the DC bus voltage signal to generate the frequency-converted AC voltage signal.

8. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 7, characterized in that, Based on the on-time of the power switch, the power switch is controlled to perform polarity reversal and amplitude modulation on the DC bus voltage signal, specifically including: The modulation function A comparison operation is performed with a preset high-frequency carrier signal; if the modulation function... If the signal is greater than or equal to the preset high-frequency carrier signal, a PWM modulation signal with a value of 1 is generated, and a power switch transistor turn-on command is output. If the modulation function... If the signal is less than the preset high-frequency carrier signal, then the PWM modulation signal with a value of 0 is generated, and a power switch transistor turn-off command is output. The full-bridge inverter circuit includes a first bridge arm and a second bridge arm; the first bridge arm includes an upper power switch and a lower power switch; the second bridge arm includes an upper power switch and a lower power switch. The polarity of the target AC voltage signal is read. During the positive half-cycle of the target AC voltage signal, the power switch on the first bridge arm and the power switch on the second bridge arm are controlled to conduct according to the PWM modulation signal based on the conduction time of the power switch. During the negative half-cycle of the target AC voltage signal, the power switch on the first bridge arm and the power switch on the second bridge arm are controlled to conduct according to the PWM modulation signal based on the conduction time of the power switch, thereby generating the frequency conversion AC voltage signal. The frequency-modulated AC voltage signal is amplitude-modulated so that the instantaneous value of the frequency-modulated AC voltage is equal to the modulation function. The product of the DC bus voltage signal.

9. The constant current frequency conversion dimming method based on bus voltage coordinated regulation according to claim 1, characterized in that, The real-time sampling of the output current signal and calculation of the current error, and the dynamic adjustment of the frequency-controlled AC voltage signal based on the current error using a current closed-loop control mechanism, specifically include: A preset output current reference value is established. The output current signal is sampled in real time, and the difference between the output current reference value and the output current signal is calculated to generate a current error. ; Based on the current error The current closed-loop control mechanism is used to correct the modulation function, and a corrected modulation function is generated. The corresponding calculation formula is as follows: In the formula, This represents the proportional gain coefficient of the current loop; This represents the current loop integral gain coefficient; Based on the modified modulation function The PWM modulation signal is regenerated and the on-time of the power switch is adjusted. The frequency conversion AC voltage signal is dynamically adjusted and input to the navigation light control circuit. The frequency conversion constant current signal is output and the navigation light is driven to adjust the light intensity.

10. A constant current frequency conversion dimming system based on bus voltage coordinated regulation, characterized in that, The system, applied to the constant current frequency conversion dimming method based on bus voltage coordinated regulation as described in any one of claims 1-9, comprises: An active rectifier module is used to acquire an input AC voltage signal and call the corresponding rectifier topology to perform active rectification processing on the input AC voltage signal to output a DC intermediate voltage signal. The bus boost module is used to boost and regulate the DC intermediate voltage signal using a bus voltage regulation model, and output a DC bus voltage signal. The frequency converter module is used to input the DC bus voltage signal to the full-bridge inverter circuit, and to perform inversion processing on the DC bus voltage signal using a PWM modulation algorithm to generate a frequency converter AC voltage signal. The constant current control module is used to sample the output current signal in real time and calculate the current error. Based on the current error, a current closed-loop control mechanism is used to dynamically adjust the frequency conversion AC voltage signal. The light intensity adjustment module is used to input the adjusted frequency-converted AC voltage signal to the navigation light control circuit, output a frequency-converted constant current signal, and drive the navigation light to adjust the light intensity.

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