Three-port digital power converter and control method thereof

Abstract

The invention discloses a three-port digital power converter and a control method thereof, and relates to the technical field of digital control, and the converter comprises a DSP processing module which is provided with a plurality of first pins, a plurality of second pins and a third pin; the first pin is connected with a differential circuit module; the third pin is connected with the to-be-detected equipment, and the DSP processing module is also used for monitoring the hot plug state of the to-be-detected equipment; each power conversion circuit comprises a control circuit, a main power circuit and a signal conditioning circuit; the input end of the control circuit is connected with the second pin, the output end of the control circuit is connected with the first input end of the main power circuit, and the second input end of the main power circuit is used for receiving a first voltage analog signal; the output end of the main power circuit is connected with the input end of the signal conditioning circuit; a fault circuit can be directly replaced or maintained, so that the downtime is reduced; different input voltage and load requirements are met, flexible power conversion is achieved, and the requirements of various application scenes are met.

Description

Technical Field

[0001] This application generally relates to the field of digital control technology, and particularly to a three-port digital power converter and its control method. Background Art

[0002] In recent years, with the development and application of digital technology, power converters based on digital control have gradually received attention. These digital control power converters use digital controllers such as Digital Signal Processors (DSPs) to achieve precise control and regulation of the power conversion process. Compared with traditional analog control methods, digital control technology has higher precision, more flexible control methods, and stronger anti-interference ability, and can achieve more efficient and stable power conversion.

[0003] Currently, although there are already some power converters based on digital control, most still adopt a single-module design and lack the hot-swap function. This means that when maintenance or replacement is required, the entire system needs to be shut down, which brings inconvenience and downtime. Therefore, we propose a three-port digital power converter and its control method to solve the above problems. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a three-port digital power converter and its control method that improve the maintainability and reliability of the system.

[0005] In a first aspect, this application provides a three-port digital power converter, including: A DSP processing module, the DSP processing module having a plurality of first pins, a plurality of second pins, and a third pin; the first pins are connected to a differential circuit module, the differential circuit module being used to differentially amplify a received first voltage analog signal to obtain a second voltage analog signal and input it to the first pins; the DSP processing module is used to convert the second voltage analog signal into a first voltage digital signal and output the first voltage digital signal through the second pins; the third pin is connected to a device to be detected, and the DSP processing module is further used to monitor the hot-swap state of the device to be detected; Multiple power conversion circuits, the power conversion circuit including a control circuit, a main power circuit, and a signal conditioning circuit; the input end of the control circuit is connected to the second pin, the output end of the control circuit is connected to the first input end of the main power circuit, the control circuit is configured to receive the first voltage digital signal, perform differential amplification on the first voltage digital signal to obtain a second voltage digital signal, and send the second voltage digital signal to the main power circuit; the main power circuit is configured to determine the operating state of its switching tubes according to the second voltage digital signal and output a voltage analog signal; the second input end of the main power circuit is configured to receive the first voltage analog signal; the output end of the main power circuit is connected to the input end of the signal conditioning circuit, and the signal conditioning circuit is configured to amplify and filter the voltage analog signal to obtain a third voltage digital signal and output it through the output end of the signal conditioning circuit; When the third pin is connected to the device to be detected, the DSP processing module adjusts the operating state of the switching tubes of the main power circuit so that the signal conditioning circuit outputs a matching third voltage digital signal.

[0006] According to the technical solution provided by the embodiment of the present application, the differential circuit module includes: A first differential circuit having a plurality of fourth pins and a plurality of fifth pins, the fourth pins being connected to the first pin, and the fifth pins being configured to receive a first voltage analog signal; the first differential circuit is configured to perform differential amplification on the first voltage analog signal to obtain a second voltage analog signal, and the fourth pins are configured to input the second voltage analog signal to the first pin; A sampling resistor Rs, the sampling resistor Rs being connected in parallel with the first differential circuit.

[0007] According to the technical solution provided by the embodiment of the present application, the DSP processing module is provided with a first ground pin, and the first differential circuit is provided with a second ground pin.

[0008] According to the technical solution provided by the embodiment of the present application, the control circuit includes: A second differential circuit having a sixth pin and a seventh pin; the sixth pin is the input end of the control circuit and is connected to the second pin; the second differential circuit is configured to perform differential amplification on the first voltage digital signal; A driving circuit having a first end and a second end, the first end being connected to the seventh pin, and the second end being the output end of the control circuit and being connected to the first input end of the main power circuit; the driving circuit is configured to amplify the first voltage digital signal after differential amplification by the second differential circuit to obtain a second voltage digital signal.

[0009] According to the technical solution provided by the embodiment of the present application, the second differential circuit further has an eighth pin, which is connected to the auxiliary power supply VCC.

[0010] According to the technical solution provided by the embodiment of the present application, the main power circuit includes: A first input capacitor C1 and a second input capacitor C2 connected in parallel. The first input capacitor C1 is connected to the input power supply V1, and the second input capacitor C2 is connected to the output power supply V2. The input power supply V1 and the output power supply V2 are respectively used to receive different first voltage analog signals; A first switching transistor Q1. The first end of the first switching transistor Q1 is connected to the first end of the input capacitor C1. The second end of the first switching transistor Q1 is connected to the first end of a second switching transistor Q2, and the second end of the second switching transistor Q2 is connected to the second end of the input capacitor C1; A third switching transistor Q3. The first end of the third switching transistor Q3 is connected to the first end of the input capacitor C2. The second end of the third switching transistor Q3 is connected to the first end of a fourth switching transistor Q4, and the second end of the fourth switching transistor Q4 is connected to the second end of the input capacitor C2; A first inductor L1. The first end of the first inductor L1 is connected to the second end of the first switching transistor Q1. The second end of the first inductor L1 is connected to the second end of the third switching transistor Q3 and the first end of a second inductor L2; A fifth switching transistor Q5. The first end of the fifth switching transistor Q5 is connected to the second end of the second inductor L2 and the first end of a sixth switching transistor Q6; An output capacitor C3 is connected between the second end of the fifth switching transistor Q5 and the second end of the sixth switching transistor Q6 for outputting a third voltage digital signal; The second end of the fifth switching transistor Q5 is also connected to the input end of the signal conditioning circuit.

[0011] In a second aspect, the present application provides a control method for a three-port digital power converter, which is implemented based on the above-mentioned three-port digital power converter. The control method includes the following steps: Collect a first input voltage sampling value of the input power supply V1, a first output voltage sampling value of the output power supply V2, and a second output voltage sampling value of the output capacitor C3; and obtain a first output voltage reference value and a second output voltage reference value; According to the first input voltage sampling value, the first output voltage reference value, and the second output voltage reference value, determine the working mode of the three-port digital power converter; and according to the current working mode of the three-port digital power converter, determine an initial duty cycle; The initial duty cycle is the duty cycle when the three-port digital power converter starts or the working mode is switched; Calculate a first difference between the first output voltage sampling value and the first output voltage reference value, and calculate a second difference between the second output voltage sampling value and the second output voltage reference value; Adjust the initialized duty cycle according to the first difference and the second difference to obtain a control parameter; and determine a third voltage digital signal according to the control parameter, and convert the third voltage digital signal into a driving signal; the driving signal is used to control the main power circuit.

[0012] According to the technical solution provided by the embodiment of the present application, after collecting the first output voltage sampling value of the output power supply V2 and the second output voltage sampling value of the output capacitor C3, before determining the working mode of the three-port digital power converter, the following steps are further included: Perform grouped filtering on the first output voltage sampling value and the second output voltage sampling value to obtain the filtered first output voltage sampling value and second output voltage sampling value.

[0013] It can be seen from the above technical solution that the present application has at least the following beneficial effects: The present application provides a three-port digital power converter, which includes: a DSP processing module, the DSP processing module has a plurality of first pins, a plurality of second pins and a third pin; a differential circuit module is connected to the first pin, and the differential circuit module is used to perform differential amplification on the received first voltage analog signal to obtain a second voltage analog signal and input it to the first pin; the DSP processing module is used to convert the second voltage analog signal into a first voltage digital signal and output the first voltage digital signal through the second pin; the third pin is connected to the device to be detected, and the DSP processing module is further used to monitor the hot plug state of the device to be detected; a plurality of power conversion circuits, the power conversion circuit includes a control circuit, a main power circuit and a signal conditioning circuit; the input end of the control circuit is connected to the second pin, the output end of the control circuit is connected to the first input end of the main power circuit, and the control circuit is used to receive the first voltage digital signal and perform differential amplification on the first voltage digital signal to obtain a second voltage digital signal and send it to the main power circuit; the main power circuit is used to determine the working state of its switching tube according to the second voltage digital signal and output a voltage analog signal; the second input end of the main power circuit is used to receive the first voltage analog signal; the output end of the main power circuit is connected to the input end of the signal conditioning circuit, and the signal conditioning circuit is used to amplify and filter the voltage analog signal to obtain a third voltage digital signal and output it through the output end of the signal conditioning circuit.

[0014] This application decomposes the power converter into multiple independent power conversion circuit modules. Each module integrates a control circuit, a main power circuit, and a signal conditioning circuit. The hot-swap status of the device to be detected is monitored through the third pin of the DSP processing module, realizing the hot-swap function of the device. The DSP processing module dynamically adjusts the working state and control strategy of the switching tubes in the main power circuit according to the hot-swap status and real-time voltage data. When a fault occurs in a certain power conversion circuit, there is no need to shut down the entire system, and the faulty circuit can be directly replaced or maintained, reducing the downtime and maintenance cost, and greatly improving the maintainability and reliability of the system. Moreover, the differential circuit module differentially amplifies the first voltage analog signal, effectively suppressing the common-mode noise and improving the anti-interference ability of the signal. At the same time, the DSP processing module converts the analog signal into a digital signal, combining the advantages of digital signal processing to make the processing of the voltage signal more accurate. During the power conversion process, the working state of the switching tubes can be controlled more accurately, thereby improving the stability of the output voltage of the power converter and reducing the impact of voltage fluctuations on the backend devices. Further, this application can have multiple power conversion circuits work together, and the control circuit of each power conversion circuit can process according to the first voltage digital signal output by the DSP processing module and accurately control the working state of the switching tubes in the main power circuit through the second voltage digital signal. This enables the three-port digital power converter to adapt to different input voltages and load requirements, realizing flexible power conversion and meeting the requirements of various application scenarios. In addition, the signal conditioning circuit amplifies and filters the first voltage digital signal, and the obtained third voltage digital signal is purer, effectively reducing the noise and ripple in the signal. The high-quality output signal helps to improve the working performance of the backend devices, reduce the risk of device failures caused by poor power signal quality, and ensure the stable operation of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects, and advantages of this application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0016] Figure 1 It is a schematic structural diagram of a single power conversion circuit.

[0017] Figure 2 It is a schematic structural diagram of a three-port digital power converter.

[0018] Figure 3 It is a schematic structural diagram of the DSP processing module controlling a single power conversion circuit.

[0019] Figure 4 It is a schematic structural diagram of the DSP processing module controlling multiple power conversion circuits.

[0020] Figure 5Flowchart of the control method for a three-port digital power converter. Specific implementation manners

[0021] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings.

[0022] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0023] For the sake of clear and concise description of the following embodiments, a brief introduction to the related technologies is given first: In the field of power electronics, digital-controlled power converters are gradually emerging. In recent years, with the continuous development of digital technologies, digital-controlled power converters have attracted much attention. It mainly uses digital controllers such as digital signal processors (DSPs) to achieve precise control and adjustment of the power conversion process.

[0024] Compared with traditional analog control methods, digital control technologies have significant advantages. Higher precision enables the power converter to process parameters such as voltage and current more accurately, improving output stability; more flexible control methods allow the converter to quickly adjust the working mode and parameters according to different working requirements and scenarios; stronger anti-interference ability ensures stable operation in complex electromagnetic environments, achieving more efficient and stable power conversion.

[0025] However, existing digital-controlled power converters still have deficiencies. Most adopt a single-module design and lack the hot-swap function. When a certain part fails or needs maintenance or replacement, the entire system has to be shut down, which not only increases the difficulty and cost of maintenance but also causes equipment downtime and affects normal use.

[0026] In view of this, the embodiments of the present application provide a three-port digital power converter, which has broad application prospects in fields such as data centers, industrial automation, communication equipment, medical equipment, and aerospace. For example, data centers require efficient and reliable power management systems, and digital power converters that support hot plugging can help replace and maintain power modules without interrupting the operation of servers. In the field of medical equipment, such as medical imaging equipment and surgical equipment, high requirements are placed on the reliability and continuity of the equipment. Digital power converters that support hot plugging can ensure that the equipment does not interrupt services during maintenance. In these fields, continuous operation and high reliability are key requirements, and the hot plugging function can ensure that the device does not need to be interrupted during maintenance or failure, thereby improving the availability and reliability of the system. Therefore, developing a digital power converter that supports hot plugging can meet the requirements of these fields for efficient power management and continuous operation. Specifically, the present application monitors the hot plugging state of the device to be detected through the third pin of the DSP processing module, realizing the hot plugging function of the device. The DSP processing module dynamically adjusts the working state and control strategy of the switching tubes in the main power circuit according to the hot plugging state and real-time voltage data. When a certain power conversion circuit fails, the entire system does not need to be shut down, and the faulty circuit can be directly replaced or maintained, reducing the downtime and maintenance cost, and greatly improving the maintainability and reliability of the system. Moreover, the differential circuit module differentially amplifies the first voltage analog signal, effectively suppressing the common-mode noise and improving the anti-interference ability of the signal. At the same time, the DSP processing module converts the analog signal into a digital signal, combining the advantages of digital signal processing to make the processing of the voltage signal more accurate. During the power conversion process, the working state of the switching tubes can be controlled more accurately, thereby improving the stability of the output voltage of the power converter and reducing the impact of voltage fluctuations on the backend equipment. Further, the present application can have multiple power conversion circuits working in cooperation, and the control circuit of each power conversion circuit can process according to the first voltage digital signal output by the DSP processing module and precisely control the working state of the switching tubes in the main power circuit through the second voltage digital signal. This enables the three-port digital power converter to adapt to different input voltages and load requirements, realizing flexible power conversion and meeting the requirements of various application scenarios. In addition, the signal conditioning circuit amplifies and filters the first voltage digital signal, and the obtained third voltage digital signal is purer, effectively reducing the noise and ripple in the signal. The high-quality output signal helps improve the working performance of the backend equipment, reduces the risk of equipment failure caused by poor power signal quality, and ensures the stable operation of the entire system.

[0027] To make the three-port digital power converter provided by the embodiments of the present application clearer and easier to understand, the converter will be introduced below with reference to the accompanying drawings. As Figure 2As shown in the figure, this is a schematic structural diagram of a three-port digital power converter provided by an embodiment of the present application. The converter includes: A DSP processing module, which has multiple first pins, multiple second pins, and one third pin; a differential circuit module is connected to the first pins. The differential circuit module is used to differentially amplify the received first voltage analog signal to obtain a second voltage analog signal and input it to the first pins; the DSP processing module is used to convert the second voltage analog signal into a first voltage digital signal and output the first voltage digital signal through the second pins; the third pin is connected to the device to be detected, and the DSP processing module is also used to monitor the hot-swap state of the device to be detected; Multiple power conversion circuits, such as Figure 1 As shown, the power conversion circuit includes a control circuit, a main power circuit, and a signal conditioning circuit; the input end of the control circuit is connected to the second pins, the output end of the control circuit is connected to the first input end of the main power circuit, and the control circuit is used to receive the first voltage digital signal, differentially amplify the first voltage digital signal to obtain a second voltage digital signal and send it to the main power circuit; the main power circuit is used to determine the working state of its switching tubes according to the second voltage digital signal and output a voltage analog signal; the second input end of the main power circuit is used to receive the first voltage analog signal; the output end of the main power circuit is connected to the input end of the signal conditioning circuit, and the signal conditioning circuit is used to amplify and filter the voltage analog signal to obtain a third voltage digital signal and output it through the output end of the signal conditioning circuit.

[0028] It should be noted that the DSP processing module has multiple first pins, multiple second pins, and one third pin. Here, the first pins are the ADC(1~n) in Figure 2 , the second pins are the PWM1(1~n),..., PWM(3~n) in Figure 2 , and the third pin is the hot-swap detection end in Figure 2 . The first pins are connected to the differential circuit module for receiving the differentially amplified second voltage analog signal; the second pins are used to output the converted first voltage digital signal; the third pin is connected to the device to be detected to monitor its hot-swap state. The differential circuit module differentially amplifies the first voltage analog signal into a second voltage analog signal, and the DSP processing module converts the second voltage analog signal into a first voltage digital signal and then outputs it through the second pins, realizing the conversion and transmission of analog signals to digital signals, ensuring the stability and accuracy of signal transmission, reducing the influence of noise interference on signals, and ensuring the accuracy of subsequent control. By connecting to the device to be detected through the third pin, the hot-swap state of the device can be sensed in real time.

[0029] The input terminal of the control circuit is connected to the second pin of the DSP processing module, receives the first voltage digital signal, performs differential amplification on it to obtain the second voltage digital signal, and then sends it to the main power circuit to enhance the driving ability of the signal, ensuring that the main power circuit can accurately respond to the control signal, thereby precisely controlling the working state of the switching tube and achieving stable power conversion. The main power circuit determines the working state of the switching tube according to the second voltage digital signal to realize the conversion and transmission of electrical energy. Its second input terminal receives the first voltage analog signal to provide input energy for power conversion. The output terminal of the main power circuit is connected to the signal conditioning circuit, and outputs the voltage analog signal to the signal conditioning circuit. The signal conditioning circuit amplifies and filters the voltage analog signal to obtain and output the third voltage digital signal. Amplifying the signal is to meet the requirements of the subsequent circuit for signal strength, and filtering is to remove the clutter and interference in the signal, improve the signal quality, make the output third voltage digital signal more stable and accurate, and provide a reliable power supply signal for subsequent applications.

[0030] Each second pin of the DSP processing module is correspondingly connected to a power conversion circuit. The three-port digital power converter works in cooperation with multiple power conversion circuits through the DSP processing module, realizing functions such as processing of voltage signals, power conversion, and hot-swap status monitoring, and improving the performance and reliability of the power converter.

[0031] Furthermore, as Figure 2 shown, the differential circuit module includes: The first differential circuit has multiple fourth pins and multiple fifth pins. The fourth pins are connected to the first pin, and the fifth pins are used to receive the first voltage analog signal. The first differential circuit is used to perform differential amplification on the first voltage analog signal to obtain the second voltage analog signal, and the fourth pins are used to input the second voltage analog signal to the first pin; The sampling resistor Rs is connected in parallel with the first differential circuit.

[0032] It should be noted that the differential circuit module plays a key role in the entire three-port digital power converter, mainly responsible for processing the input first voltage analog signal, and obtaining the second voltage analog signal that meets the requirements of the subsequent circuit through differential amplification.

[0033] The first differential circuit has multiple fourth pins, and the number of fourth pins is the same as that of the first pin. These fourth pins are connected to the first pin of the DSP processing module. Its main function is to input the second voltage analog signal processed by the first differential circuit into the DSP processing module so that the DSP processing module can convert it into the first voltage digital signal. The first differential circuit also has multiple fifth pins for receiving the externally input first voltage analog signal. The fifth pins are, for example, Figure 2 the V in1（1~n） , V 2（1~n） , V 3（1~n） . The first voltage analog signal is the starting signal of the entire signal processing flow and will be input into the first differential circuit for processing. The core function of the first differential circuit is to differentially amplify the input first voltage analog signal. Differential amplification is an important signal processing technique that can effectively suppress the common-mode signal (i.e., the same part of the two input signals) while amplifying the differential-mode signal (i.e., the difference between the two input signals). In this way, the anti-interference ability of the signal can be improved and the signal quality can be enhanced. After differential amplification, the first voltage analog signal is converted into a second voltage analog signal and then delivered to the DSP processing module through the fourth pin.

[0034] The sampling resistor Rs is connected in parallel with the first differential circuit. In the circuit, the sampling resistor Rs can be used to collect current information. According to Ohm's law (V = IR), when current flows through the sampling resistor, a voltage drop will be generated across the resistor. By measuring this voltage drop, the magnitude of the current in the circuit can be calculated. In a power converter, current information is very important for controlling and protecting the circuit, such as for overcurrent protection, power calculation, etc. Moreover, the presence of the sampling resistor Rs will have a certain impact on the input and output characteristics of the first differential circuit. It will change the load condition of the differential circuit, thus affecting the effect of differential amplification. When designing the circuit, it is necessary to reasonably select the resistance value of the sampling resistor to ensure that the differential circuit can work properly and meet the requirements of the system for signal processing.

[0035] Through the collaborative work of the first differential circuit and the sampling resistor Rs, the differential circuit module processes the first voltage analog signal and provides a high-quality second voltage analog signal for the subsequent DSP processing module, thus ensuring the normal operation of the entire three-port digital power converter.

[0036] In addition, as Figure 2 shown, the DSP processing module is provided with a first ground pin, and the first differential circuit is provided with a second ground pin.

[0037] It should be noted that in an electronic circuit, grounding is a key means to establish a unified reference potential. The first ground pin of the DSP processing module and the second ground pin of the first differential circuit jointly establish a stable zero-potential reference point for their respective circuit parts. During the operation of the circuit, various charges will inevitably accumulate. If these charges are not released in time, it may cause circuit failures or even damage components. The ground pin is like a "charge recycling station" that can introduce these excess charges into the ground to ensure the safe and stable operation of the circuit. When the digital power converter is working, due to various electromagnetic interferences, induced charges will be generated in the circuit, and the ground pin can quickly conduct these charges away to prevent the influence of charge accumulation on the circuit.

[0038] Here, the first ground pin is, for example, Figure 2 GND1 in Figure 2 and the second ground pin is, for example, GND2 in . In actual circuit design, the first ground pin of the DSP processing module and the second ground pin of the first differential circuit are usually directly connected or connected through a low-impedance path. Such a connection method ensures that the two circuit parts are at the same potential, reducing the interference caused by the potential difference. If there is a large potential difference between the two ground pins, a current will be formed between them, interfering with the normal signal transmission. Just like two water tanks at different heights, if their bottoms are connected, the water will flow naturally until the water levels in the two tanks are the same. The connection of the ground pins is also to make the potentials of the two circuit parts "the same" and avoid the "potential difference water flow" from interfering with the signal. The two ground pins work together to build a good grounding system for the entire circuit.

[0039] Furthermore, as Figure 1 shown, the control circuit includes: A second differential circuit having a sixth pin and a seventh pin; the sixth pin is the input end of the control circuit and is connected to the second pin; the second differential circuit is used to differentially amplify the first voltage digital signal; A driving circuit having a first end and a second end, the first end is connected to the seventh pin, and the second end is the output end of the control circuit and is connected to the first input end of the main power circuit; the driving circuit is used to amplify the first voltage digital signal differentially amplified by the second differential circuit to obtain a second voltage digital signal.

[0040] It should be noted that the control circuit plays a crucial role in the entire power conversion system. It is used to receive the first voltage digital signal from the DSP processing module, process and amplify it, and finally output an appropriate second voltage digital signal to control the working state of the switching tube in the main power circuit, thereby achieving precise control of the power conversion process. The first voltage digital signal is, for example, Figure 1 the PWM signal in .

[0041] The sixth pin serves as the input terminal of the control circuit and is connected to the second pin of the DSP processing module. This connection enables the second differential circuit to receive the first voltage digital signal from the DSP processing module. After converting the first voltage analog signal into the first voltage digital signal, the DSP processing module outputs the first voltage digital signal to the sixth pin of the control circuit through the second pin, providing a basis for subsequent processing. The seventh pin is used to output the signal after differential amplification and is connected to the first end of the drive circuit. The main function of the second differential circuit is to perform differential amplification on the first voltage digital signal. Differential amplification has the characteristics of suppressing common-mode signals and amplifying differential-mode signals. In an actual circuit, signals may be affected by various interferences during transmission, generating common-mode noise. Through differential amplification, these common-mode noises can be effectively suppressed, while the useful differential-mode signals are enhanced, improving the signal quality and anti-interference ability. The signal after differential amplification can more accurately reflect the characteristics of the original signal, providing a more reliable basis for subsequent processing.

[0042] The first end of the drive circuit is connected to the seventh pin of the second differential circuit, and the first end of the drive circuit receives the first voltage digital signal after differential amplification. The second end of the drive circuit serves as the output terminal of the control circuit and is connected to the first input terminal of the main power circuit. The drive circuit outputs the processed second voltage digital signal to the main power circuit, thereby controlling the working state of the switching tube in the main power circuit. The main role of the drive circuit is to further amplify the first voltage digital signal after differential amplification by the second differential circuit to obtain the second voltage digital signal. Since the power of the signal output by the second differential circuit may not be sufficient to directly drive the switching tube in the main power circuit, the drive circuit needs to amplify the signal in terms of power to provide sufficient driving ability. The second voltage digital signal after being amplified by the drive circuit can ensure that the switching tube in the main power circuit accurately conducts and turns off according to the control requirements, realizing effective control of the power conversion process.

[0043] Specifically, the DSP processing module converts the first voltage analog signal into the first voltage digital signal and outputs it through the second pin. The second differential circuit of the control circuit receives the first voltage digital signal through the sixth pin, performs differential amplification on it, suppresses common-mode noise, and enhances the differential-mode signal. The signal after differential amplification is transmitted to the first end of the drive circuit through the seventh pin. The drive circuit amplifies the signal in terms of power to obtain the second voltage digital signal with sufficient driving ability. The second voltage digital signal is output to the first input terminal of the main power circuit through the second end of the drive circuit, controlling the working state of the switching tube in the main power circuit and realizing the conversion of the power supply.

[0044] In addition, as Figure 1 shown, the second differential circuit also has an eighth pin, which is connected to the auxiliary power supply VCC.

[0045] It should be noted that the auxiliary power supply VCC provides a stable working power supply for the second differential circuit, enabling it to accurately perform differential amplification processing on the first voltage digital signal. The auxiliary power supply VCC also plays a certain isolation and protection role. It isolates the power supply of the second differential circuit from that of the main power circuit, reducing the impact of voltage fluctuations, current surges, etc. in the main power circuit on the second differential circuit. During the operation of the power converter, the current and voltage in the main power circuit change significantly. If directly sharing the power supply with the control circuit, these changes may be conducted into the control circuit, interfering with signal processing. The isolation function of the auxiliary power supply VCC is like a barrier, preventing interference from the main power circuit from entering the second differential circuit and ensuring the stable operation of the control circuit.

[0046] Moreover, connecting the auxiliary power supply VCC is the basis for the normal operation of the second differential circuit. When the second differential circuit performs differential amplification on the first voltage digital signal, it consumes a certain amount of energy, and the electrical energy provided by VCC ensures the smooth progress of the differential amplification process. If the power supply of the auxiliary power supply VCC is abnormal, such as too low voltage or unstable voltage, it will cause the amplifier in the second differential circuit to fail to work properly, and the effect of differential amplification will be greatly reduced. The output signal may have problems such as distortion and increased noise, which will further affect the signal processing of the subsequent drive circuit and the control accuracy of the main power circuit.

[0047] Parameters of the auxiliary power supply VCC, such as voltage value, ripple coefficient, etc., will directly affect the performance indicators of the second differential circuit. An appropriate voltage value can make the transistors in the second differential circuit operate in the best state, improving circuit performance such as gain and linearity. If the ripple coefficient of VCC is large, it will introduce additional noise into the output signal of the second differential circuit, reducing the signal quality and affecting the performance of the entire control circuit.

[0048] Furthermore, as Figure 1 shown, the main power circuit includes: A first input capacitor C1 and a second input capacitor C2 connected in parallel. The first input capacitor C1 is connected to the input power supply V1, and the second input capacitor C2 is connected to the output power supply V2. The input power supply V1 and the output power supply V2 are respectively used to receive different first voltage analog signals; A first switching transistor Q1. The first end of the first switching transistor Q1 is connected to the first end of the input capacitor C1, the second end of the first switching transistor Q1 is connected to the first end of the second switching transistor Q2, and the second end of the second switching transistor Q2 is connected to the second end of the input capacitor C1; A third switching transistor Q3. The first end of the third switching transistor Q3 is connected to the first end of the input capacitor C2, the second end of the third switching transistor Q3 is connected to the first end of the fourth switching transistor Q4, and the second end of the fourth switching transistor Q4 is connected to the second end of the input capacitor C2; The first inductor L1, the first end of the first inductor L1 is connected to the second end of the third switching transistor Q1, and the second end of the first inductor L1 is connected to the second end of the third switching transistor Q3 and the first end of the second inductor L2; The fifth switching transistor Q5, the first end of the fifth switching transistor Q5 is connected to the second end of the second inductor L2 and the first end of the sixth switching transistor Q6; an output capacitor C3 is connected between the second end of the fifth switching transistor Q5 and the second end of the sixth switching transistor Q6 for outputting a third voltage digital signal; the second end of the fifth switching transistor Q5 is also connected to the input end of the signal conditioning circuit.

[0049] It should be noted that the first input end of the main power circuit is Figure 1 the gates of the switching transistors Q1 - 6 in Figure 1 the input power supply V1 interface and the output power supply V2 interface in Figure 1 the node between the second end of the fifth switching transistor Q5 and the second end of the sixth switching transistor Q6 in

[0050] The first input capacitor C1 and the second input capacitor C2 are connected in parallel and are respectively connected to different power supplies. The first input capacitor C1 is connected to the input power supply V1, and the second input capacitor C2 is connected to the output power supply V2. They receive different first voltage analog signals. The voltages provided by the input power supply V1 and the output power supply V2 may have fluctuations and noises. The first input capacitor C1 and the second input capacitor C2 can smooth these voltages, reduce the influence of fluctuations and noises on the subsequent circuits, and ensure that the voltage input to the main power circuit is relatively stable. In addition, the energy storage characteristic of the capacitor can provide energy support when the circuit instantaneously requires a large current to maintain the normal operation of the circuit.

[0051] The first end of the first switching transistor Q1 is connected to the first end of the first input capacitor C1, the second end of the first switching transistor Q1 is connected to the first end of the second switching transistor Q2, and the second end of the second switching transistor Q2 is connected to the second end of the first input capacitor C1. They form a basic switching unit. By controlling the on - off of the first switching transistor Q1 and the second switching transistor Q2, the current path and voltage distribution in the circuit can be changed. In different working modes, the on - off states of the first switching transistor Q1 and the second switching transistor Q2 are different, so as to realize different power conversion functions, such as boosting or bucking.

[0052] The first end of the third switching transistor Q3 is connected to the first end of the second input capacitor C2. The second end of the third switching transistor Q3 is connected to the first end of the fourth switching transistor Q4. The second end of the fourth switching transistor Q4 is connected to the second end of C2. This pair of switching transistors is also a key part of the circuit, working in coordination with the first switching transistor Q1 and the second switching transistor Q2 to change the circuit state according to the control signal and cooperate with components such as inductors to achieve the conversion and transmission of electrical energy. In certain modes, the conduction states of the third switching transistor Q3 and the fourth switching transistor Q4 determine the flow direction and magnitude of energy between different ports.

[0053] The first end of the fifth switching transistor Q5 is connected to the second end of the second inductor L2 and the first end of the sixth switching transistor Q6. An output capacitor C3 is connected between the second end of the fifth switching transistor Q5 and the second end of the sixth switching transistor Q6. Moreover, the second end of the fifth switching transistor Q5 is also connected to the input end of the signal conditioning circuit. The fifth switching transistor Q5 and the sixth switching transistor Q6 control the circuit of the output part, and their conduction and cutoff affect the stability of the output voltage and the magnitude of the output current. The output capacitor C3 further filters to make the output third voltage digital signal smoother, meet the requirements of the load for power quality, and at the same time provide a stable input signal for the signal conditioning circuit.

[0054] The first end of the first inductor L1 is connected to the second end of the first switching transistor Q1. The second end of the first inductor L1 is connected to the second end of the third switching transistor Q3 and the first end of the second inductor L2. The inductor has the functions of energy storage and filtering in the circuit. When the switching transistor is conducting, the inductor stores energy; when the switching transistor is cutoff, the inductor releases energy to maintain the continuity of the current in the circuit. Through the cooperation of the inductor and the switching transistor, the energy conversion between different ports is achieved. For example, in the step-up or step-down process, the energy storage and release processes of the inductor play a key role in the rise and fall of the voltage.

[0055] The second inductor L2 works in coordination with the first inductor L1 to further enhance the filtering and energy storage effects of the inductor, ensure that the current and voltage in the circuit are more stable, and improve the efficiency and quality of power conversion. The two inductors in the multi-phase interleaved parallel structure help to reduce the current ripple of the input and output.

[0056] For example, as Figure 3As shown, the first pin (ADC(1~n)) of the DSP processing module is connected to the differential circuit module. The differential circuit module receives the first voltage analog signal, performs differential amplification to obtain the second voltage analog signal, and then inputs it to the first pin. The DSP processing module converts the second voltage analog signal into the first voltage digital signal, and outputs it to the control circuit through the second pin (PWM(1~n)). The second differential circuit in the control circuit differentially amplifies the first voltage digital signal, and then further amplifies it by the drive circuit to output the second voltage digital signal to control the working state of the switching tube in the main power circuit. The main power circuit outputs the third voltage digital signal after being processed by the signal conditioning circuit. Such a complete signal processing path demonstrates the conversion and control process from the input analog signal to the output stable digital signal.

[0057] The differential circuit module suppresses the common-mode noise and improves the input signal quality; the DSP processing module realizes the conversion from analog to digital signals and precisely processes the signals by taking advantage of digital signal processing; the control circuit amplifies and processes the digital signals to drive the main power circuit; the main power circuit realizes the electric energy conversion; the signal conditioning circuit improves the output signal quality. Each module cooperates with each other to ensure the stable operation of the power converter.

[0058] As Figure 4 shown, multiple power conversion circuits are connected in parallel and are all connected to the DSP processing module. The DSP processing module can simultaneously send the first voltage digital signal to multiple power conversion circuits. Each power conversion circuit independently processes the signals according to its own needs to realize different power conversion functions. This parallel structure enables the three-port digital power converter to meet different load requirements and improves the overall power processing ability of the system.

[0059] Moreover, the number of power conversion circuits can be increased or decreased according to the actual application scenario. For example, in a data center, as the number of devices increases, the power conversion circuits can be added to meet the growing power demand. And each circuit is independent and works in cooperation with each other, enhancing the flexibility and adaptability of the system. In addition, the design of multiple power conversion circuits has advantages in fault handling. When a certain circuit fails, the DSP processing module can detect it and adjust the control of other normal circuits to ensure the continuous operation of the entire system. For example, in a medical device, even if some power conversion circuits fail, other normal circuits can still supply power to the key components of the device to maintain the basic operation of the device and wait for the faulty circuit to be repaired or replaced.

[0060] As Figure 5 shown, the present application also provides a control method for a three-port digital power converter, which is implemented based on the above-mentioned three-port digital power converter. The control method includes the following steps: S100. Collect the first input voltage sampling value of the input power supply V1, the first output voltage sampling value of the output power supply V2, and the second output voltage sampling value of the output capacitor C3; and obtain the first output voltage reference value and the second output voltage reference value.

[0061] Among them, collecting the first input voltage sampling value of the input power supply V1, the first output voltage sampling value of the output power supply V2, and the second output voltage sampling value of the output capacitor C3 is to obtain the voltage states of each port of the power converter in real time. These sampling values reflect the actual working conditions of the current circuit and are the basic data for subsequent control decisions. Obtaining the first output voltage reference value and the second output voltage reference value provides a target basis for control and is used to judge the difference between the current output voltage and the desired voltage.

[0062] For example, sensors or sampling circuits are used to obtain the above voltage values, and then voltage transformers, resistor voltage dividers, etc. are used to convert high voltages into voltage signals suitable for collection, and then the analog signals are converted into digital signals through A / D converters for subsequent digital processing.

[0063] S200. Determine the working mode of the three-port digital power converter according to the first input voltage sampling value, the first output voltage reference value, and the second output voltage reference value; and determine the initial duty cycle according to the current working mode of the three-port digital power converter; the initial duty cycle is the duty cycle when the three-port digital power converter starts or the working mode is switched.

[0064] Among them, the working mode is determined according to the first input voltage sampling value and the first and second output voltage reference values. Here, the three-port converter has multiple working modes divided according to the port voltages, such as the working modes of Mode1 - Mode13 shown in Table 1. Different voltage relationships correspond to different energy conversion requirements. By determining the working mode, the converter can select an appropriate control strategy to achieve efficient energy conversion.

[0065] In Table 1, V1 represents the first input voltage sampling value, V2 represents the first output voltage reference value, and V3 represents the second output voltage reference value. d1 represents the duty cycle corresponding to switch Q1, d3 represents the duty cycle corresponding to switch Q3, and d5 represents the duty cycle corresponding to switch Q5. @XXkHz represents the operating frequency of this parameter. For example, Dmax@20kHz means that d1 adopts the maximum duty cycle and the operating frequency is 20kHz. Dmax represents the maximum allowable duty cycle of d1 in this mode (such as the hardware limit is 95%), which is used for fast energy transfer (such as full-load conditions in Boost mode). The parameters of PID regulation: such as PID1@100kHz means that d3 is regulated by the first PID controller, and the operating frequency is 100kHz, which is applicable to scenarios that require fast response (such as voltage stabilization during load mutation). Special case of the sum of duty cycles: such as in Mode7, d1 + d3 = 1.85, because in this mode, the two switches work together (such as complementary conduction), and the sum of the duty cycles needs to satisfy the law of conservation of energy (such as d1 = 0.9, d3 = 0.95, and the sum is 1.85).

[0066] Initializing the duty cycle plays an important role when the three-port digital power converter starts or switches operating modes. It provides the starting value for subsequent duty cycle regulation, ensuring that the converter has a reasonable operating state at the moment of startup or mode switching, and avoiding large fluctuations in voltage and current. At startup, an appropriate initial duty cycle can enable the converter to quickly and stably enter the operating state; during mode switching, it can reduce the impact during the switching process and ensure the stability of the system.

[0067] The parameters in Table 1 are the initial duty cycle or basic control parameters. In actual operation, the DSP will dynamically adjust the duty cycle according to the difference between the sampling value and the reference value (such as the first difference, the second difference). For example: in Mode1, if the output voltage of V3 is lower than the reference value, the DSP will increase the duty cycle of d5 through PID2 until the voltage is stable. The operating frequency (such as 20kHz, 100kHz) determines the regulation accuracy of the duty cycle. A higher frequency (such as 100kHz) can achieve a more delicate duty cycle regulation (such as a resolution of 0.1%), but it will increase the switching loss; a lower frequency (such as 20kHz) is suitable for high-power scenarios and reduces the heating of the switch. When the relationship between the port voltages changes and causes a mode switch (such as switching from Mode1 to Mode2), the DSP will pre-calculate the duty cycle parameters of the new mode to avoid voltage shocks caused by sudden changes in the duty cycle (such as using a linear gradient method to switch d1, d3, d5).

[0068] The DSP processing module collects the voltage values of V1, V2, and V3, matches the mode in Table 1 according to the voltage magnitude relationship, reads the initial values of d1, d3, and d5, and dynamically optimizes them in combination with the PID algorithm.

[0069] Table 1 Working Mode Mode Port Voltage d1 d3 d5 Mode 1 V1 < V2 < V3 Dmax@20kHz PID1@100kHz PID2@100kHz Mode 2 V1 < V3 < V2 Dmax@20kHz PID1@100kHz PID2@100kHz Mode 3 V2 < V1 < V3 PID1@100kHz Dmax@20kHz PID2@100kHz Mode 4 V2 < V3 < V1 PID1@100kHz Dmax@20kHz PID2@100kHz Mode 5 V3 < V1 < V2 PID1@100kHz PID2@100kHz Dmax@20kHz Mode 6 V3 < V2 < V1 PID1@100kHz PID2@100kHz Dmax@20kHz Mode 7 V1≈V2<V3 PID1@20kHz d1 + d3 = 1.85@20kHz PID2@100kHz Mode 8 V1≈V3<V2 PID1@20kHz PID2@100kHz d1 + d5 = 1.85@20kHz Mode 9 V2≈V3<V1 d1 + d3 = 1.85@100kHz PID1@20kHz PID2@20kHz Mode10 V3 < V1 ≈ V2 PID1@50kHz PID2@50kHz Dmax@20kHz Mode11 V2 < V1 ≈ V3 PID1@50kHz Dmax@20kHz PID2@50kHz Mode12 V1 < V2 ≈ V3 Dmax@20kHz PID1@50kHz PID2@50kHz Mode13 V1≈V2≈V3 0.8@20kHz PID1@20kHz PID2@20kHz S300. Calculate the first difference between the first output voltage sampling value and the first output voltage reference value, and calculate the second difference between the second output voltage sampling value and the second output voltage reference value.

[0070] Among them, calculating the first difference between the first output voltage sampling value and the first output voltage reference value, and the second difference between the second output voltage sampling value and the second output voltage reference value is to quantify the deviation between the current output voltage and the desired voltage. These differences can intuitively reflect the error situation of the converter output voltage, providing an accurate basis for the subsequent duty cycle adjustment.

[0071] The magnitude and sign of the difference determine the adjustment direction and amplitude of the duty cycle. If the first difference is positive, it means that the first output voltage sampling value is higher than the reference value, and the duty cycle of the relevant switching tube needs to be reduced to lower the output voltage; conversely, if the difference is negative, the duty cycle needs to be increased. By continuously calculating the difference and making adjustments, the output voltage can gradually approach the reference value, achieving a stable voltage output.

[0072] S400. Adjust the initialized duty cycle according to the first difference and the second difference to obtain a control parameter; and determine a third voltage digital signal according to the control parameter, and convert the third voltage digital signal into a driving signal; the driving signal is used to control the main power circuit.

[0073] Among them, adjusting the initialized duty cycle according to the first difference and the second difference usually adopts a PID control algorithm or other intelligent control algorithms. For example, dual-PID modulation is used, and by adjusting the three parameters of proportional, integral, and differential, the duty cycle can be accurately adjusted according to the difference. The adjusted duty cycle is used as a control parameter to determine the third voltage digital signal.

[0074] Convert the third voltage digital signal into a driving signal. The driving signal is used to control the main power circuit. By controlling the on and off time of the switching tube (determined by the duty cycle), precise control of power conversion is achieved, thereby adjusting the output voltage and current to meet the requirements of the load. The accuracy and stability of the driving signal directly affect the performance and output quality of the power supply converter.

[0075] Furthermore, after collecting the first output voltage sampling value of the output power supply V2 and the second output voltage sampling value of the output capacitor C3, before determining the working mode of the three-port digital power converter, the following steps are also included: Perform grouped filtering on the first output voltage sampling value and the second output voltage sampling value to obtain the filtered first output voltage sampling value and the second output voltage sampling value.

[0076] It should be noted that in the actual working environment of a power converter, there are various interference sources, such as electromagnetic interference, power supply noise, etc. These interferences will make the collected voltage sampling values contain noise and errors. If these error-containing sampling values are directly used to determine the working mode, it may lead to incorrect judgments. Because even a small voltage fluctuation may be misjudged as a real change in voltage without filtering, causing the converter to enter the wrong working mode. Group filtering can effectively remove these noises and errors and improve the accuracy of the sampling values. The filtered sampling values are more stable and can provide reliable feedback information for the system, enabling the converter to accurately adjust its working state according to the actual situation, thus improving the stability and reliability of the system.

[0077] Group filtering is performed when collecting the port voltage value, that is, taking the average value after sampling 10 times. This grouping method is a simple and effective filtering method. By sampling multiple times and taking the average value, the influence of random errors in a single sampling can be reduced. Each sampling may be affected by different degrees of interference, and the value of a single sampling may deviate significantly from the true value. However, after multiple samplings and taking the average value, these random errors can cancel each other out, resulting in a result closer to the true voltage value.

[0078] In terms of hardware implementation, a dedicated filtering circuit or software algorithm is used to implement group filtering. If it is a hardware filtering circuit, an RC filtering circuit, an LC filtering circuit, etc. can be used to filter the collected voltage signal. In terms of software, corresponding algorithms can be written using a microcontroller or a digital signal processor (DSP) to process the sampling data. Specifically, it is to continuously collect 10 voltage values within a certain period of time, then add these 10 values and divide by 10 to obtain the filtered voltage sampling value.

[0079] After group filtering, the obtained first output voltage sampling value and second output voltage sampling value are more stable and accurate. These accurate sampling values provide a reliable basis for determining the working mode of the three-port digital power converter. The determination of the working mode is based on the magnitude relationship of the port voltages. Accurate voltage sampling values can avoid voltage misjudgments caused by noise, enabling the system to select the appropriate working mode according to the real voltage situation, thus achieving more efficient energy conversion and control.

[0080] The above description is only a preferred embodiment of the present application and an explanation of the technical principles applied. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. A three-port digital power converter, characterized in that, Comprising: A DSP processing module, which has a plurality of first pins, a plurality of second pins and a third pin; the first pins are connected to a differential circuit module, and the differential circuit module is used for differentially amplifying the received first voltage analog signal to obtain a second voltage analog signal and inputting it to the first pins; the DSP processing module is used for converting the second voltage analog signal into a first voltage digital signal and outputting the first voltage digital signal through the second pins; the third pin is connected to the device to be detected, and the DSP processing module is also used for monitoring the hot plug state of the device to be detected; A plurality of power conversion circuits, each power conversion circuit including a control circuit, a main power circuit and a signal conditioning circuit; the input end of the control circuit is connected to the second pins, the output end of the control circuit is connected to the first input end of the main power circuit, and the control circuit is used for receiving the first voltage digital signal and differentially amplifying the first voltage digital signal to obtain a second voltage digital signal and sending it to the main power circuit; The main power circuit is used for determining the working state of its switching tubes according to the second voltage digital signal and outputting a voltage analog signal; the second input end of the main power circuit is used for receiving the first voltage analog signal; the output end of the main power circuit is connected to the input end of the signal conditioning circuit, and the signal conditioning circuit is used for amplifying and filtering the voltage analog signal to obtain a third voltage digital signal and outputting it through the output end of the signal conditioning circuit; When the third pin is connected to the device to be detected, the DSP processing module adjusts the working state of the switching tubes of the main power circuit so that the signal conditioning circuit outputs a matching third voltage digital signal.

2. The three-port digital power converter according to claim 1, wherein, The differential circuit module includes: A first differential circuit, which has a plurality of fourth pins and a plurality of fifth pins, the fourth pins are connected to the first pins, and the fifth pins are used for receiving the first voltage analog signal; the first differential circuit is used for differentially amplifying the first voltage analog signal to obtain a second voltage analog signal, and the fourth pins are used for inputting the second voltage analog signal to the first pins; A sampling resistor Rs, which is connected in parallel with the first differential circuit.

3. The three-port digital power converter according to claim 2, wherein, The DSP processing module is provided with a first ground pin, and the first differential circuit is provided with a second ground pin.

4. A three-port digital power converter according to claim 1, characterized in that, The control circuit includes: A second differential circuit, which has a sixth pin and a seventh pin; the sixth pin is the input end of the control circuit and is connected to the second pins; the second differential circuit is used for differentially amplifying the first voltage digital signal; A drive circuit, which has a first end and a second end, the first end is connected to the seventh pin, and the second end is the output end of the control circuit and is connected to the first input end of the main power circuit; the drive circuit is used for amplifying the first voltage digital signal differentially amplified by the second differential circuit to obtain a second voltage digital signal.

5. A three-port digital power converter according to claim 4, characterized in that, The second differential circuit further has an eighth pin, which is connected to the auxiliary power supply VCC.

6. The three-port digital power converter according to claim 1, wherein The main power circuit includes: A first input capacitor C1 and a second input capacitor C2 connected in parallel. The first input capacitor C1 is connected to the input power supply V1, and the second input capacitor C2 is connected to the output power supply V2. The input power supply V1 and the output power supply V2 are respectively used to receive different first voltage analog signals. A first switching transistor Q1. The first end of the first switching transistor Q1 is connected to the first end of the input capacitor C1. The second end of the first switching transistor Q1 is connected to the first end of a second switching transistor Q2, and the second end of the second switching transistor Q2 is connected to the second end of the input capacitor C1. A third switching transistor Q3. The first end of the third switching transistor Q3 is connected to the first end of the input capacitor C2. The second end of the third switching transistor Q3 is connected to the first end of a fourth switching transistor Q4, and the second end of the fourth switching transistor Q4 is connected to the second end of the input capacitor C2. A first inductor L1. The first end of the first inductor L1 is connected to the second end of the first switching transistor Q1. The second end of the first inductor L1 is connected to the second end of the third switching transistor Q3 and the first end of a second inductor L2. A fifth switching transistor Q5. The first end of the fifth switching transistor Q5 is connected to the second end of the second inductor L2 and the first end of a sixth switching transistor Q6. An output capacitor C3 is connected between the second end of the fifth switching transistor Q5 and the second end of the sixth switching transistor Q6 for outputting a third voltage digital signal. The second end of the fifth switching transistor Q5 is also connected to the input end of the signal conditioning circuit.

7. A control method for a three-port digital power converter, implemented based on the three-port digital power converter according to any one of claims 1-6, characterized in that, The control method includes the following steps: Collect a first input voltage sampling value of the input power supply V1, a first output voltage sampling value of the output power supply V2, and a second output voltage sampling value of the output capacitor C3; and obtain a first output voltage reference value and a second output voltage reference value. Determine the working mode of the three-port digital power converter according to the first input voltage sampling value, the first output voltage reference value, and the second output voltage reference value; and determine an initial duty cycle according to the current working mode of the three-port digital power converter. The initial duty cycle is the duty cycle when the three-port digital power converter starts or the working mode is switched. Calculate a first difference between the first output voltage sampling value and the first output voltage reference value, and calculate a second difference between the second output voltage sampling value and the second output voltage reference value. Adjust the initial duty cycle according to the first difference and the second difference to obtain a control parameter; and determine a third voltage digital signal according to the control parameter, and convert the third voltage digital signal into a drive signal. The drive signal is used to control the main power circuit.

8. A control method for a three-port digital power converter according to claim 7, characterized in that Before determining the working mode of the three-port digital power converter after collecting the first output voltage sampling value of the output power supply V2 and the second output voltage sampling value of the output capacitor C3, the following steps are further included: Group filtering is performed on the first output voltage sampling value and the second output voltage sampling value to obtain the filtered first output voltage sampling value and the second output voltage sampling value.

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