Two-channel mutual aid fractional order conversion type power supply system

Abstract

The invention discloses a dual-channel mutual aid fractional order conversion type power supply system, and belongs to the technical field of power electronics. The system comprises a first energy unit, a second energy unit, a common-cathode power conversion unit and a common-anode power conversion unit, the first energy unit serves as the input of the common-anode power conversion unit, the second energy unit serves as the input of the common-cathode power conversion unit, and the first energy unit is connected with the output of the common-cathode power conversion unit in series. The second energy unit is connected in series with the common anode power conversion unit. Through mutual cooperation of the two energy units and the power conversion units, management of output voltage, current and power of the two energy units is achieved at the same time, the two power conversion units only need to process part of power, the size, weight, cost and power loss of the power supply system are greatly reduced, and efficiency is improved.

Description

Technical Field

[0001] The invention relates to a power supply, and in particular to a dual-channel mutual aid fractional-order conversion power supply system. Background Art

[0002] Higher efficiency, higher power density, and lower cost are the eternal pursuits of various power conversion systems. The rapid development of technologies such as new energy, energy storage, electric vehicles, industrial and defense equipment has put forward new requirements for the efficiency, power density, and cost of power conversion devices and systems. Partial power conversion technology has been widely studied and paid attention to because it can avoid converting all power. It reduces the power capacity of active circuits to improve circuit efficiency and reduce its cost. A typical partial power conversion circuit realizes partial power conversion by connecting the output of the power conversion circuit in series with the input source.

[0003] For example, in the patent with application number 202311373988.1, an uninterruptible power supply based on a series partial power converter and a control method thereof were invented. The invention adopts an isolated active circuit, and realizes backup battery energy management by controlling the output voltage and current of the active circuit. However, the circuit introduces a phase-shifted full-bridge circuit with a complex topological structure and control method, which significantly increases the circuit cost, weight and loss. For another example, in the patent with application number 202211462160.9, a bidirectional buck-boost four-quadrant partial power converter and a control method thereof were invented. The invention adopts an architecture in which a four-quadrant converter and a resonant converter are cascaded and then connected in series with a battery. Its power conversion circuit is composed of two sets of circuit cascades, and the energy management of the battery is realized by controlling the output voltage and current of the four-quadrant converter. In order to maintain the normal buck-boost function of the four-quadrant converter, the circuit introduces a complex resonant converter. Although partial power conversion is realized and the circuit efficiency is improved to a certain extent, the significant increase in circuit complexity, cost and volume makes the circuit proposed in the invention less practical. For another example, the paper "Fractional Charging Converter With High Efficiency and Low Cost for Electrochemical Energy Storage Devices" published in IEEE Transactions on Power Electronics, 2019, Issue 6, Page 7461, demonstrates a series partial power conversion circuit based on a full-bridge converter. It also uses a complex isolation converter to realize the non-isolated partial power conversion function, which leads to increased circuit cost, weight and loss, and the overall performance of the power supply system is significantly affected.

[0004] It can be seen that although the existing partial power conversion circuits have achieved partial power conversion, they have inevitably introduced complex circuits and control methods, which has reduced their overall performance and is even less practical than the traditional full power conversion technology. The existing partial power conversion circuits must use complex isolated power converters to achieve the purpose of partial power conversion. The isolated power converters are composed of primary circuits, transformers, rectifier circuits, filter circuits, etc., and use a large number of switching devices and must use isolation transformers, which increases the volume, weight, cost and loss of the power supply system, and has problems such as high cost, low efficiency and low power density. Summary of the invention

[0005] In view of the problems existing in the prior art, an object of the present invention is to provide a low-cost and high-efficiency dual-channel mutually-aided fractional-order conversion power supply system.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: A dual-channel mutual aid fractional-order conversion power supply system includes a first energy unit, a second energy unit, a common cathode power conversion unit and a common anode power conversion unit, and is provided with a first output terminal V o+ and the second output terminal V o- ,in: The common cathode power conversion unit is provided with a common cathode power conversion unit input terminal A1, a common cathode power conversion unit output terminal B1, and a common cathode power conversion unit common terminal C1; the common anode power conversion unit is provided with a common anode power conversion unit input terminal A2, a common anode power conversion unit output terminal B2, and a common anode power conversion unit common terminal C2; One end of the first energy unit is connected to the common anode power conversion unit common terminal C2, and the other end is connected to the common anode power conversion unit input terminal A2. One end of the second energy unit is connected to the common cathode power conversion unit common terminal C1, and the other end is connected to the common cathode power conversion unit input terminal A1. The common anode power conversion unit common terminal C2 is connected to the first output terminal V o+ The common anode power conversion unit input terminal A2 is connected to the common cathode power conversion unit output terminal B1, the common anode power conversion unit output terminal B2 is connected to the common cathode power conversion unit input terminal A1, and the common cathode power conversion unit common terminal C1 is connected to the second output terminal V o- .

[0007] Furthermore, the common anode power conversion unit is specifically any one of a common anode Buck circuit, a common anode Boost circuit, and a common anode four-switch Buck / Boost circuit.

[0008] Furthermore, the common anode Buck circuit includes a filter inductor L f2 、Filter capacitor C f2 , a first switch tube Q1 and a second switch tube Q2, wherein the source of the first switch tube Q1 is connected to the input terminal A2 of the common anode power conversion unit, the drain of the second switch tube Q2 is connected to the common terminal C2 of the common anode power conversion unit, the drain of the first switch tube Q1 is connected to the source of the second switch tube Q2, and the filter inductor L f2 One end is connected to the drain of the first switch tube Q1, and the other end is connected to the output terminal B2 of the common anode power conversion unit. C f2 The positive electrode is connected to the common terminal C2 of the common anode power conversion unit, and the negative electrode is connected to the output terminal B2 of the common anode power conversion unit.

[0009] Furthermore, the common anode Boost circuit includes a filter inductor L f2 、Filter capacitor C f2 , a first switch tube Q1 and a second switch tube Q2, wherein the drain of the first switch tube Q1 is connected to the common end C2 of the common anode power conversion unit, the source of the second switch tube Q2 is connected to the output end B2 of the common anode power conversion unit, the source of the first switch tube Q1 is connected to the drain of the second switch tube Q2, and the filter inductor L f2 One end is connected to the source of the first switch tube Q1, and the other end is connected to the common anode power conversion unit input terminal A2. C f2 The positive electrode is connected to the common terminal C2 of the common anode power conversion unit, and the negative electrode is connected to the output terminal B2 of the common anode power conversion unit.

[0010] Furthermore, the common anode four-switch Buck / Boost circuit includes an energy storage inductor L s2 、Filter capacitor C f2, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, wherein the source of the first switch tube Q1 is connected to the input terminal A2 of the common anode power conversion unit, the drain of the third switch tube Q3 is connected to the common terminal C2 of the common anode power conversion unit, the drain of the first switch tube Q1 is connected to the source of the third switch tube Q3, the source of the second switch tube Q2 is connected to the output terminal B2 of the common anode power conversion unit, the drain of the fourth switch tube Q4 is connected to the common terminal C2 of the common anode power conversion unit, the drain of the second switch tube Q2 is connected to the source of the fourth switch tube Q4, and the energy storage inductor L s2 One end is connected to the drain of the first switch tube Q1, and the other end is connected to the drain of the second switch tube Q2. C f2 The positive electrode is connected to the common terminal C2 of the common anode power conversion unit, and the negative electrode is connected to the output terminal B2 of the common anode power conversion unit.

[0011] Furthermore, the common cathode power conversion unit is specifically any one of a common cathode Buck circuit, a common cathode Boost circuit, and a common cathode four-switch Buck / Boost circuit.

[0012] Furthermore, the common cathode Buck circuit includes a filter inductor L f1 、Filter capacitor C f1 , a fifth switch tube Q5 and a sixth switch tube Q6, wherein the drain of the fifth switch tube Q5 is connected to the input terminal A1 of the common cathode power conversion unit, the source of the sixth switch tube Q6 is connected to the common terminal C1 of the common cathode power conversion unit, the source of the fifth switch tube Q5 is connected to the drain of the sixth switch tube Q6, and the filter inductor L f1 One end is connected to the source of the fifth switch tube Q5, and the other end is connected to the output terminal B1 of the common cathode power conversion unit. C f1 The negative electrode is connected to the common terminal C1 of the common cathode power conversion unit, and the positive electrode is connected to the output terminal B1 of the common cathode power conversion unit.

[0013] Furthermore, the common cathode Boost circuit includes a filter inductor L f1 、Filter capacitor C f1, a fifth switch tube Q5 and a sixth switch tube Q6, wherein the source of the fifth switch tube Q5 is connected to the common terminal C1 of the common cathode power conversion unit, the drain of the sixth switch tube Q6 is connected to the output terminal B1 of the common cathode power conversion unit, the drain of the fifth switch tube Q5 is connected to the source of the sixth switch tube Q6, and the filter inductor L f1 One end is connected to the drain of the fifth switch tube Q5, and the other end is connected to the common cathode power conversion unit input terminal A1. C f1 The negative electrode is connected to the common terminal C1 of the common cathode power conversion unit, and the positive electrode is connected to the output terminal B1 of the common cathode power conversion unit.

[0014] Furthermore, the common cathode four-switch Buck / Boost circuit includes an energy storage inductor L s1 、Filter capacitor C f1 , a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7 and an eighth switch tube Q8, wherein the drain of the fifth switch tube Q5 is connected to the input terminal A1 of the common cathode power conversion unit, the source of the seventh switch tube Q7 is connected to the common terminal C1 of the common cathode power conversion unit, the source of the fifth switch tube Q5 is connected to the drain of the seventh switch tube Q7, the drain of the sixth switch tube Q6 is connected to the output terminal B1 of the common cathode power conversion unit, the source of the eighth switch tube Q8 is connected to the common terminal C1 of the common cathode power conversion unit, the source of the sixth switch tube Q6 is connected to the drain of the eighth switch tube Q8, and the energy storage inductor L s1 One end is connected to the source of the fifth switch tube Q5, and the other end is connected to the source of the sixth switch tube Q6. C f1 The negative electrode is connected to the common terminal C1 of the common cathode power conversion unit, and the positive electrode is connected to the output terminal B1 of the common cathode power conversion unit.

[0015] Furthermore, the first energy unit and the second energy unit are any one of a DC power supply, a supercapacitor, a storage capacitor, a battery, a fuel cell, and a new energy power generation device.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The dual-channel mutually aided fractional-order conversion power supply system of the present invention can realize energy management for the second energy unit by adjusting the output voltage and current of the common anode power conversion unit, and realize energy management for the first energy unit by adjusting the output voltage and current of the common cathode power conversion unit. The common anode power conversion unit and the common cathode power conversion unit manage each other and work together. Therefore, no other auxiliary circuits need to be introduced in the power conversion unit to realize partial power conversion and energy management, thereby avoiding additional volume, cost and active power loss, greatly improving the power density and efficiency of the circuit, and making the partial power conversion circuit truly realize fractional-order power conversion; 2. The present invention adopts an interlaced parallel structure to connect two power conversion units and two energy units, so that when any power conversion unit fails and is removed, the normal operation of the circuit will not be affected. The two power conversion units are redundant with each other, which greatly improves the reliability of the circuit and reduces the current stress of a single power conversion unit, which helps to reduce circuit cost and improve circuit efficiency. 3. The power conversion unit of the present invention adopts non-isolated power conversion circuits such as Buck circuit, Boost circuit, four-switch Buck / Boost circuit to realize partial power conversion. Compared with other partial power conversion inventions, the circuit complexity is significantly reduced, and there are fewer passive devices, thereby significantly reducing the circuit cost. The circuit volume is smaller, thereby improving and reducing the circuit power density, the control is simple, and there are fewer active devices, thereby avoiding excessive switching loss and driving loss, and improving circuit efficiency; it does not include a transformer, thereby avoiding additional core loss and winding loss, and improving circuit efficiency; 4. The voltage of the energy unit of the present invention can be actively adjusted according to the working conditions and can be equal or unequal, so that the invention has a wider range of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the architecture of a dual-channel mutual aid fractional-order conversion power supply system provided by the present invention; Figure 2 The common anode Buck circuit topology diagram provided by the present invention; Figure 3 The common cathode Buck circuit topology diagram provided by the present invention; Figure 4 A circuit topology diagram of the dual-channel mutual aid fractional-order conversion power supply system provided by the present invention in a battery energy management application scenario; Figure 5 Key circuit operating waveforms of the dual-channel mutual aid fractional-order conversion power supply system provided by the present invention in the battery energy management application scenario; Figure 6 A schematic diagram of a common cathode Buck circuit modulation method in a battery energy management application scenario provided by the present invention; Figure 7 The equivalent circuit of the common cathode Buck circuit mode 1 in the battery energy management application scenario provided by the present invention; Figure 8 The equivalent circuit of mode 2 of the common cathode Buck circuit in the battery energy management application scenario provided by the present invention; Fig. 9 A topological diagram of a common anode Boost circuit provided by the present invention; Fig.10 A topological diagram of a common cathode Boost circuit provided by the present invention; Fig.11 A topological diagram of a common anode Buck / Boost circuit provided by the present invention; Fig.12 A topological diagram of a common cathode Buck / Boost circuit provided by the present invention; Fig.13 Circuit topology diagram of the dual-channel mutual aid fractional-order conversion power supply system provided by the present invention in the application scenario of photovoltaic power generation energy management Fig.14 A circuit topology diagram of the dual-channel mutual aid fractional-order conversion power supply system provided by the present invention in the application scenario of wind power generation energy management; Fig.15 A circuit topology diagram of the dual-channel mutual aid fractional-order conversion power supply system provided by the present invention in the application scenario of capacitor energy management; Fig.16 A circuit diagram of a common anode isolated power conversion unit provided by the present invention; Fig.17 A circuit diagram of a common cathode isolated power conversion unit provided by the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] The embodiment of the present invention provides a dual-channel mutual aid fractional-order conversion power supply system, such as Figure 1 As shown, it includes a first energy unit, a second energy unit, a common cathode power conversion unit and a common anode power conversion unit, and is provided with a first output terminal V o+ and the second output terminal V o-. The common cathode power conversion unit is specifically a non-isolated power conversion circuit, and the common cathode power conversion unit is provided with a common cathode power conversion unit input terminal A1, a common cathode power conversion unit output terminal B1, and a common cathode power conversion unit common terminal C1; the common anode power conversion unit is specifically a non-isolated power conversion circuit, and is provided with a common anode power conversion unit input terminal A2, a common anode power conversion unit output terminal B2, and a common anode power conversion unit common terminal C2; one end of the first energy unit is connected to the common anode power conversion unit common terminal C2, and the other end is connected to the common anode power conversion unit input terminal A2, one end of the second energy unit is connected to the common cathode power conversion unit common terminal C1, and the other end is connected to the common cathode power conversion unit input terminal A1, and the common anode power conversion unit common terminal C2 is connected to the first output terminal V o+ , the first output terminal V o+ The anode of the system output is used to realize the common anode of the common anode power conversion unit, the common anode power conversion unit input terminal A2 is connected to the common cathode power conversion unit output terminal B1, the common anode power conversion unit output terminal B2 is connected to the common cathode power conversion unit input terminal A1, and the common cathode power conversion unit common terminal C1 is connected to the second output terminal V o- , the second output terminal V o- It is the ground for the system output, thereby realizing the common ground of the common cathode power conversion unit.

[0020] In one embodiment, when the dual-channel mutually aided fractional-order conversion power supply system is applied to a battery energy management application scenario, the first energy unit is implemented by the first battery pack BTS1, the second energy unit is implemented by the second battery pack BTS2, the common anode power conversion unit is implemented by the common anode Buck circuit, and the common cathode power conversion unit is implemented by the common cathode Buck circuit.

[0021] Among them, Figure 2 As shown, the common anode Buck circuit includes a filter inductor L f2 、Filter capacitor C f2 , a first switch tube Q1 and a second switch tube Q2, the source of the first switch tube Q1 is connected to the common anode power conversion unit input terminal A2, the drain of the second switch tube Q2 is connected to the common anode power conversion unit common terminal C2, the drain of the first switch tube Q1 is connected to the source of the second switch tube Q2, and the filter inductor L f2 One end is connected to the drain of the first switch tube Q1, and the other end is connected to the output terminal B2 of the common anode power conversion unit. C f2 The positive electrode is connected to the common terminal C2 of the common anode power conversion unit, and the negative electrode is connected to the output terminal B2 of the common anode power conversion unit.

[0022] like Figure 3 As shown, the common cathode Buck circuit includes a filter inductor L f1 、Filter capacitor C f1 , a fifth switch tube Q5 and a sixth switch tube Q6, the drain of the fifth switch tube Q5 is connected to the common cathode power conversion unit input terminal A1, the source of the sixth switch tube Q6 is connected to the common cathode power conversion unit common terminal C1, the source of the fifth switch tube Q5 is connected to the drain of the sixth switch tube Q6, and the filter inductor L f1 One end is connected to the source of the fifth switch tube Q5, and the other end is connected to the output terminal B1 of the common cathode power conversion unit. C f1 The negative electrode is connected to the common terminal C1 of the common cathode power conversion unit, and the positive electrode is connected to the output terminal B1 of the common cathode power conversion unit.

[0023] One end of the first battery pack BTS1 is connected to the common terminal C2 of the common anode power conversion unit, and the other end is connected to the input terminal A2 of the common anode power conversion unit. One end of the second battery pack BTS2 is connected to the common terminal C1 of the common cathode power conversion unit, and the other end is connected to the input terminal A1 of the common cathode power conversion unit. The dual-channel mutual aid fractional-order conversion power supply system in the battery energy management application scenario is finally formed as follows: Figure 4 shown.

[0024] In the common anode Buck circuit, the common terminal C2 of the common anode power conversion unit is positive, and the output terminal B2 of the common anode power conversion unit is negative. The voltage between the two terminals is defined as the common anode Buck circuit output voltage v c2 In the common cathode Buck circuit, the common cathode power conversion unit common terminal C1 is negative, and the common cathode power conversion unit output terminal B1 is positive. The voltage between the two terminals is defined as the common cathode Buck circuit output voltage v c1 The end of the first battery group BTS1 connected to the common anode power conversion unit common terminal C2 is taken as positive, and the end of the first battery group BTS1 connected to the common anode power conversion unit input terminal A2 is taken as negative. The voltage across the first battery group BTS1 is defined as v s1 The end of the second battery pack BTS2 connected to the common cathode power conversion unit common terminal C1 is negative, and the end of the second battery pack BTS2 connected to the common cathode power conversion unit input terminal A1 is positive. The voltage across the second battery pack BTS2 is defined as v s2 In the common anode Buck circuit, the current flows from the common anode power conversion unit output terminal B2 to the common anode Buck circuit filter inductor. L f2 The direction is positive, and the output current of the common anode Buck circuit is defined as i Lf2. Using the common cathode Buck circuit to filter the inductor from the common cathode Buck circuit L f1 The direction flowing to the output terminal B1 of the common cathode power conversion unit is the positive direction, and the output current of the common cathode Buck circuit is defined as i Lf1 The output voltage of the power system is defined as V, with the first battery group BTS1 connected to the common anode power conversion unit common terminal C2 as the positive terminal and the common cathode power conversion unit common terminal C1 in the common cathode Buck circuit as the negative terminal. o The common anode power conversion unit common terminal C2 flows to the common cathode power conversion unit output terminal V o+ The direction is the positive direction, and the output current of the power supply system is defined as i o .

[0025] The key parameters and working waveforms of the circuits defined above are as follows: Figure 5 As shown, the gates of the switches in the common anode Buck circuit and the common cathode Buck circuit are input with PWM control signals to control the on and off of the switches. When the output power and output voltage of the power system of the battery energy management application are constant, as the first battery pack BTS1 and the second battery pack BTS2 discharge, their output voltages continue to drop. At this time, the output voltages of the common anode Buck circuit and the common cathode Buck circuit are controlled to rise through the PWM control signal to maintain the constant output voltage of the power system.

[0026] The following is a brief description of the control principle using a common cathode Buck circuit: As the voltage of the first battery pack BTS1 continues to drop, the output voltage of the common cathode Buck circuit should rise accordingly to ensure the stability of the overall output voltage of the battery energy management system. At the same time, the voltage of the second battery pack BTS2 input to the common cathode Buck circuit also drops as the discharge progresses, so the duty cycle of the PWM control signal input to the fifth switch tube Q5 is D y Rapid rise, to achieve the control of the common cathode Buck circuit and even the overall voltage of the battery energy management system, the specific modulation method is as follows Figure 6 shown. Figure 6 Shows the duty cycle D y The changes of the PWM control signal of the fifth switch tube Q5 and the PWM control signal of the sixth switch tube Q6. There are two switching modes: Switching mode 1: the fifth switch tube Q5 is turned on, and the sixth switch tube Q6 is turned off. The equivalent circuit diagram is as follows Figure 7 As shown. At this time, the first filter inductor L f1 Withstand forward voltage, i Lf1Rising, the second battery pack BTS2 supplies power to the common cathode Buck circuit; Switching mode 2: the fifth switch tube Q5 is turned off, and the sixth switch tube Q6 is turned on. The equivalent circuit diagram is as follows Figure 8 As shown. i Lf1 The sixth switch tube continues the current and the first filter inductor L f1 The control method of the common anode Buck circuit is the same as that of the common cathode Buck circuit. The voltage is controlled by adjusting the duty cycle of the PWM control signal of the first switch tube Q1 and the second switch tube Q2. The modulation method and equivalent circuit diagram can be easily obtained from the above description of the common cathode Buck circuit, and will not be repeated here. At this time, for the first battery group BTS1, its output power is i Lf1 For the second battery pack BTS2, its output power is proportional to i Lf2 At this time, by adjusting the duty cycle of the common anode Buck circuit and the common cathode Buck circuit switch tube PWM control signal, the i Lf2 and i Lf1 The adjustment of the discharge power of the first battery group BTS1 and the first battery group BTS2 is realized, thereby realizing the energy management of the first battery group BTS1 and the second battery group BTS2. It can be seen from this that the common anode Buck circuit and the common cathode Buck circuit of the dual-channel mutual aid fractional-order conversion type in the battery energy management application support each other, manage each other, and work together.

[0027] The following will analyze the key numerical relationships of the dual-channel mutual aid fractional-order conversion power supply system in the battery energy management application scenario. For the convenience of description, the following only discusses the working mode in which the first battery set BTS1 and the second battery set BTS2 discharge together to power the load. Other working modes such as the first battery set BTS1 and the second battery set BTS2 are charged at the same time and one of the first battery set BTS1 and the second battery set BTS2 is charged and the other is discharged. The principle of this working mode is basically the same, and can be simply derived based on subsequent analysis, so it will not be repeated here. In the battery energy management application scenario, for the branch formed by the first battery set BTS1 and the common cathode Buck circuit, the output power P of the first battery set BTS1 is BTS1 for: P BTS1 =i Lf1 *v s1 .

[0028] In the battery energy management application scenario, for the branch formed by the first battery pack BTS1 and the common cathode Buck circuit, the common cathode Buck circuit output power P Buck- for: P Buck- =i Lf1 *v c1 .

[0029] In the battery energy management application scenario, for the branch formed by the first battery pack BTS1 and the common cathode Buck circuit, the output power P of the branch is 01 for: P 01 =P Buck- +P BTS1 =i Lf1 (v s1 +v c1 ) .

[0030] In the battery energy management application scenario, the branch output voltage formed by the first battery pack BTS1 and the common cathode Buck circuit satisfies: v c1 +v s1 =V o .

[0031] Therefore, in the battery energy management application scenario, for the branch formed by the first battery pack BTS1 and the common cathode Buck circuit, the proportion of the power to be output after power conversion to the total output power α1 is: α1=P Buck- / P 01 =v c1 / (v s1 +v c1 ) .

[0032] Similarly, in the battery energy management application scenario, for the branch formed by the second battery pack BTS2 and the common anode Buck circuit, the proportion of the power to be output after power conversion to the total output power α2 is: α2=P Buck+ / P 02 =v c2 / (v s2 +v c2 ), P Buck+ is the output power of the common anode Buck circuit, P 02 It is the output power of the branch formed by the second battery pack BTS2 and the common anode Buck circuit.

[0033] Therefore, the dual-channel mutual aid fractional-order conversion power system realizes partial power conversion in the battery energy management application scenario. If the efficiency of the Buck circuit to achieve power conversion is η, then in the traditional full power conversion scenario, the active power loss of the power system P loss1 for: P loss1 =P o (1-η)=(P 02 +P 01 )(1-η).

[0034] The power system efficiency η1 is: η 1= 1-P loss1 / (P 02 +P 01 ) .

[0035] In the application scenario of battery energy management, the active power loss P of the power system is loss2 for: P loss2 =(α2*P 02 +α1*P 01 )(1-η).

[0036] According to the expressions of α1 and α2, α1 is less than 1, and α2 is less than 1. Therefore, the active loss of the dual-channel mutual aid fractional-order conversion power system in the battery energy management application scenario is reduced compared with the traditional full-power conversion scenario. At this time, the power system efficiency η2 is: η2=1-P loss2 / (P 02 +P 01 ) .

[0037] Obviously, the dual-channel mutual aid fractional-order conversion power supply system has a greatly reduced active power loss compared to the traditional full-power conversion method, that is, P loss2 <P loss1 , so the power system efficiency is effectively improved.

[0038] In the application scenario of battery energy management in the dual-channel mutual aid fractional-order conversion power system, according to v s1 、v c1 、v s2 、v c2 The numerical relationship can be achieved by adjusting the common cathode Buck circuit output current i Lf1 The output current i of the common anode Buck circuit is Lf2The quantity relationship is adjusted to adjust the size relationship of the discharge power of the first battery pack BTS1 and the second battery pack BTS2 to achieve energy management of the two battery packs. Therefore, the common cathode Buck circuit and the anode Buck circuit are managed and work together. Obviously, compared with the traditional partial power conversion circuit, the embodiment of the present invention does not require a complex, bulky, high-cost, and low-efficiency isolation converter as an auxiliary circuit, and has low cost, high efficiency, and high power density.

[0039] In another embodiment, the common cathode Buck circuit in the above embodiment may be replaced by a common cathode Boost circuit, and the common anode Buck circuit may be replaced by a common anode Boost circuit.

[0040] like Fig. 9 As shown, the common anode boost circuit includes a filter inductor L f2 、Filter capacitor C f2 , a first switch tube Q1 and a second switch tube Q2, the drain of the first switch tube Q1 is connected to the common end C2 of the common anode power conversion unit, the source of the second switch tube Q2 is connected to the output end B2 of the common anode power conversion unit, the source of the first switch tube Q1 is connected to the drain of the second switch tube Q2, and the filter inductor L f2 One end is connected to the source of the first switch tube Q1, and the other end is connected to the common anode power conversion unit input terminal A2. C f2 The positive electrode is connected to the common terminal C2 of the common anode power conversion unit, and the negative electrode is connected to the output terminal B2 of the common anode power conversion unit.

[0041] like Fig.10 As shown, the common cathode boost circuit includes a filter inductor L f1 、Filter capacitor C f1 , a fifth switch tube Q5 and a sixth switch tube Q6, the source of the fifth switch tube Q5 is connected to the common end C1 of the common cathode power conversion unit, the drain of the sixth switch tube Q6 is connected to the output end B1 of the common cathode power conversion unit, the drain of the fifth switch tube Q5 is connected to the source of the sixth switch tube Q6, and the filter inductor L f1 One end is connected to the drain of the fifth switch tube Q5, and the other end is connected to the common cathode power conversion unit input terminal A1. The filter capacitor C f1 The negative electrode is connected to the common terminal C1 of the common cathode power conversion unit, and the positive electrode is connected to the output terminal B1 of the common cathode power conversion unit.

[0042] In yet another embodiment, the common cathode Buck circuit in the above embodiment may be replaced by a common cathode four-switch Buck / Boost circuit, and the common anode Buck circuit may be replaced by a common anode four-switch Buck / Boost circuit.

[0043] like Fig.11 As shown, the common anode four-switch Buck / Boost circuit includes an energy storage inductor L s2 、Filter capacitor C f2 , a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, the source of the first switch tube Q1 is connected to the input terminal A2 of the common anode power conversion unit, the drain of the third switch tube Q3 is connected to the common terminal C2 of the common anode power conversion unit, the drain of the first switch tube Q1 is connected to the source of the third switch tube Q3, the source of the second switch tube Q2 is connected to the output terminal B2 of the common anode power conversion unit, the drain of the fourth switch tube Q4 is connected to the common terminal C2 of the common anode power conversion unit, the drain of the second switch tube Q2 is connected to the source of the fourth switch tube Q4, and the energy storage inductor L s2 One end is connected to the drain of the first switch tube Q1, and the other end is connected to the drain of the second switch tube Q2. C f2 The positive electrode is connected to the common terminal C2 of the common anode power conversion unit, and the negative electrode is connected to the output terminal B2 of the common anode power conversion unit.

[0044] like Fig.12 As shown, the common cathode four-switch Buck / Boost circuit includes an energy storage inductor L s1 、Filter capacitor C f1 , a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7 and an eighth switch tube Q8, the drain of the fifth switch tube Q5 is connected to the input terminal A1 of the common cathode power conversion unit, the source of the seventh switch tube Q7 is connected to the common terminal C1 of the common cathode power conversion unit, the source of the fifth switch tube Q5 is connected to the drain of the seventh switch tube Q7, the drain of the sixth switch tube Q6 is connected to the output terminal B1 of the common cathode power conversion unit, the source of the eighth switch tube Q8 is connected to the common terminal C1 of the common cathode power conversion unit, the source of the sixth switch tube Q6 is connected to the drain of the eighth switch tube Q8, and the energy storage inductor L s1 One end is connected to the source of the fifth switch tube Q5, and the other end is connected to the source of the sixth switch tube Q6. C f1 The negative electrode is connected to the common terminal C1 of the common cathode power conversion unit, and the positive electrode is connected to the output terminal B1 of the common cathode power conversion unit.

[0045] It can be understood that in any embodiment, the first energy unit and the second energy unit can also be replaced by any one of a DC power supply, a super capacitor, an energy storage capacitor, a fuel cell, a new energy power generation device, etc., and the first energy unit and the second energy unit can be different types of energy. The common anode power conversion unit can also be replaced by any other non-isolated power conversion circuit with a common positive terminal for input and output, and the common cathode power conversion unit can also be replaced by any other non-isolated power conversion circuit with a common ground for input and output.

[0046] In addition to being applied to battery energy management application scenarios, the embodiments of the present invention can also be applied to photovoltaic power generation, wind power generation, capacitor energy management and other scenarios, such as Fig.13 , 14 , as shown in 15. Fig.13 In the figure, PV1 and PV2 represent the first photovoltaic power generation device and the second photovoltaic power generation device, respectively. Fig.14 WTGS1 and WTGS2 represent the first wind power generation device and the second wind power generation device, respectively. Fig.15 In, C s1 and C s2 In these application scenarios, the above principles can also be used to achieve partial power conversion, coordinated operation of two energy units, and other required specific functions.

[0047] In addition, it should be noted that although the present invention does not require the use of an isolated power conversion circuit, if there are special considerations and an isolated power conversion circuit must be used in an application scenario, the common anode power conversion unit can be implemented by any common anode isolated power conversion unit with a common positive pole, and the common cathode power conversion unit can also be implemented by any common cathode isolated power conversion unit with a common ground. Fig.16 The common anode isolated power conversion unit includes an isolated power conversion circuit, and is provided with a first input terminal IN+ of the isolated power conversion circuit, a second input terminal IN- of the isolated power conversion circuit, a first output terminal OUT+ of the isolated power conversion circuit, a second output terminal OUT- of the isolated power conversion circuit, a common anode power conversion unit input terminal A2, a common anode power conversion unit output terminal B2, and a common anode power conversion unit common terminal C2; the first input terminal IN+ of the isolated power conversion circuit is connected to the common anode power conversion unit common terminal C2, the first output terminal OUT+ of the isolated power conversion circuit is connected to the common anode power conversion unit common terminal C2, the second input terminal IN- of the isolated power conversion circuit is connected to the input terminal A2 of the common anode power conversion unit, and the second output terminal OUT- of the isolated power conversion circuit is connected to the output terminal B2 of the common anode power conversion unit. Please refer to Fig.17The common cathode isolated power conversion unit includes an isolated power conversion circuit, and is provided with a first input terminal IN+ of the isolated power conversion circuit, a second input terminal IN- of the isolated power conversion circuit, a first output terminal OUT+ of the isolated power conversion circuit, a second output terminal OUT- of the isolated power conversion circuit, an input terminal A1 of the common cathode power conversion unit, an output terminal B1 of the common cathode power conversion unit, and a common terminal C1 of the common cathode power conversion unit; the second input terminal IN- of the isolated power conversion circuit is connected to the common terminal C1 of the common cathode power conversion unit, the second output terminal OUT- of the isolated power conversion circuit is connected to the common terminal C1 of the common cathode power conversion unit, the first input terminal IN+ of the isolated power conversion circuit is connected to the input terminal A1 of the common cathode power conversion unit, and the first output terminal OUT+ of the isolated power conversion circuit is connected to the output terminal B1 of the common cathode power conversion unit. The common anode isolated power conversion unit and the common cathode isolated power conversion unit are connected to the dual-channel mutual aid fractional-order conversion power supply system topology according to corresponding terminals, so as to realize the isolated dual-channel mutual aid fractional-order conversion power supply system.

[0048] The above description is only a preferred example of the present invention and is not intended to limit the present invention. For ordinary technicians in this technical field, various modifications, changes and substitutions of the present invention should be regarded as the protection scope of the present invention without making the corresponding technical solutions essentially deviate from the spirit and principles of the present invention.

Claims

1. A dual-channel mutual aid fractional-order conversion power supply system, characterized in that: It includes a first energy unit, a second energy unit, a common cathode power conversion unit and a common anode power conversion unit, and is provided with a first output terminal and a second output terminal, wherein: The common cathode power conversion unit is provided with a common cathode power conversion unit input terminal, a common cathode power conversion unit output terminal, and a common cathode power conversion unit common terminal; the common anode power conversion unit is provided with a common anode power conversion unit input terminal, a common anode power conversion unit output terminal, and a common anode power conversion unit common terminal; one end of the first energy unit is connected to the common anode power conversion unit common terminal, and the other end is connected to the common anode power conversion unit input terminal, one end of the second energy unit is connected to the common cathode power conversion unit common terminal, and the other end is connected to the common cathode power conversion unit input terminal, the common anode power conversion unit common terminal is connected to the first output terminal, the common anode power conversion unit input terminal is connected to the common cathode power conversion unit output terminal, the common anode power conversion unit output terminal is connected to the common cathode power conversion unit input terminal, and the common cathode power conversion unit common terminal is connected to the second output terminal.

2. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 1, characterized in that: The common anode power conversion unit is specifically any one of a common anode Buck circuit, a common anode Boost circuit, and a common anode four-switch Buck / Boost circuit.

3. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 2, characterized in that: The common anode Buck circuit includes a filter inductor, a filter capacitor, a first switch tube and a second switch tube, wherein the source of the first switch tube is connected to the input end of the common anode power conversion unit, the drain of the second switch tube is connected to the common end of the common anode power conversion unit, the drain of the first switch tube is connected to the source of the second switch tube, one end of the filter inductor is connected to the drain of the first switch tube, and the other end is connected to the output end of the common anode power conversion unit, the positive electrode of the filter capacitor is connected to the common end of the common anode power conversion unit, and the negative electrode is connected to the output end of the common anode power conversion unit.

4. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 2, characterized in that: The common anode Boost circuit includes a filter inductor, a filter capacitor, a first switch tube and a second switch tube, the drain of the first switch tube is connected to the common end of the common anode power conversion unit, the source of the second switch tube is connected to the output end of the common anode power conversion unit, the source of the first switch tube is connected to the drain of the second switch tube, one end of the filter inductor is connected to the source of the first switch tube, and the other end is connected to the input end of the common anode power conversion unit, the positive electrode of the filter capacitor is connected to the common end of the common anode power conversion unit, and the negative electrode is connected to the output end of the common anode power conversion unit.

5. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 2, characterized in that: The common anode four-switch Buck / Boost circuit includes an energy storage inductor, a filter capacitor, a first switch tube, a second switch tube, a third switch tube and a fourth switch tube. The source of the first switch tube is connected to the input end of the common anode power conversion unit, the drain of the third switch tube is connected to the common end of the common anode power conversion unit, the drain of the first switch tube is connected to the source of the third switch tube, the source of the second switch tube is connected to the output end of the common anode power conversion unit, the drain of the fourth switch tube is connected to the common end of the common anode power conversion unit, the drain of the second switch tube is connected to the source of the fourth switch tube, one end of the energy storage inductor is connected to the drain of the first switch tube, and the other end is connected to the drain of the second switch tube. The positive electrode of the filter capacitor is connected to the common end of the common anode power conversion unit, and the negative electrode is connected to the output end of the common anode power conversion unit.

6. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 1, characterized in that: The common cathode power conversion unit is specifically any one of a common cathode Buck circuit, a common cathode Boost circuit, and a common cathode four-switch Buck / Boost circuit.

7. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 6, characterized in that: The common cathode Buck circuit includes a filter inductor, a filter capacitor, a fifth switch tube and a sixth switch tube, the drain of the fifth switch tube is connected to the input end of the common cathode power conversion unit, the source of the sixth switch tube is connected to the common end of the common cathode power conversion unit, the source of the fifth switch tube is connected to the drain of the sixth switch tube, one end of the filter inductor is connected to the source of the fifth switch tube, and the other end is connected to the output end of the common cathode power conversion unit, the negative electrode of the filter capacitor is connected to the common end of the common cathode power conversion unit, and the positive electrode is connected to the output end of the common cathode power conversion unit.

8. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 6, characterized in that: The common cathode Boost circuit includes a filter inductor, a filter capacitor, a fifth switch tube and a sixth switch tube. The source of the fifth switch tube is connected to the common end of the common cathode power conversion unit, the drain of the sixth switch tube is connected to the output end of the common cathode power conversion unit, the drain of the fifth switch tube is connected to the source of the sixth switch tube, one end of the filter inductor is connected to the drain of the fifth switch tube, and the other end is connected to the input end of the common cathode power conversion unit. The negative electrode of the filter capacitor is connected to the common end of the common cathode power conversion unit, and the positive electrode is connected to the output end of the common cathode power conversion unit.

9. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 6, characterized in that: The common cathode four-switch Buck / Boost circuit includes an energy storage inductor, a filter capacitor, a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube. The drain of the fifth switch tube is connected to the input end of the common cathode power conversion unit, the source of the seventh switch tube is connected to the common end of the common cathode power conversion unit, the source of the fifth switch tube is connected to the drain of the seventh switch tube, the drain of the sixth switch tube is connected to the output end of the common cathode power conversion unit, the source of the eighth switch tube is connected to the common end of the common cathode power conversion unit, the source of the sixth switch tube is connected to the drain of the eighth switch tube, one end of the energy storage inductor is connected to the source of the fifth switch tube, and the other end is connected to the source of the sixth switch tube. The negative electrode of the filter capacitor is connected to the common end of the common cathode power conversion unit, and the positive electrode is connected to the output end of the common cathode power conversion unit.

10. The dual-channel mutually-aided fractional-order conversion power supply system according to claim 1, characterized in that: The first energy unit and the second energy unit are any one of a DC power supply, a super capacitor, an energy storage capacitor, a battery, a fuel cell, and a new energy power generation device.

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