Power stabilizing power supply converter based on buck-boost topology
By using a power smoothing converter based on buck-boost topology, combined with dual closed-loop and single current loop control, the problem of weight and volume control of high-power DC/DC converters in aviation power supply systems is solved, achieving efficient energy replenishment and voltage stability, and making it suitable for energy replenishment in aviation power supply systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-04-10
AI Technical Summary
Existing high-power DC/DC converters cannot effectively control weight and size in aviation power supply systems, nor can they meet high-power requirements, and they cannot effectively prevent bus voltage drops during EHA system startup.
A power smoothing converter based on buck-boost topology is adopted. By combining the buck-boost circuit and the control circuit, and using dual closed-loop or single current loop control, forward boost discharge and reverse buck charging modes are realized. Insulated gate enhancement type P-MOS transistors are used to reduce the number of power devices and improve efficiency.
It reduces the cost and losses of power smoothing converters, improves working efficiency, and has the functions of 300V to 540V boost and 540V to 300V buck, avoiding overcharging or undercharging of batteries, and is suitable for energy replenishment of aviation power supply systems.
Smart Images
Figure CN121841111A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of DC-DC power converter, in particular to a power stabilizing power converter based on buck-boost topology. BACKGROUND
[0002] The aviation power supply system undertakes the task of providing reliable, safe and uninterrupted power to all electrical equipment on the aircraft; the EHA system needs to instantaneously draw a large power from the DC bus during startup, which will cause the DC bus voltage to drop rapidly, which is not conducive to the stability of other electrical equipment in the microgrid, therefore, when the EHA system is working, the power stabilizing power supply needs to supplement the energy of the EHA system to prevent the bus voltage from dropping and play the role of "adding valley".
[0003] At present, in the secondary power industry, high-power DC / DC converters are mainly divided into isolated and non-isolated types, but due to the topology structure, power device parameters, circuit design and other limitations, it is impossible to achieve high-power requirements in theoretical design, and the weight and volume are difficult to control. SUMMARY
[0004] The purpose of the present application is to provide a power stabilizing power converter based on buck-boost topology to solve the problems raised in the background.
[0005] To achieve the above purpose, the present application provides the following technical scheme: a power stabilizing power converter based on buck-boost topology, comprising a DC voltage stabilizing power supply, a battery pack and a control circuit, the DC voltage stabilizing power supply and the battery pack are connected in parallel with a buck-boost two-circuit, the buck-boost two-circuit is connected with the control circuit, the buck-boost two-circuit has a boost circuit and a buck circuit, the boost circuit is composed of an inductor L1, a power tube Q1, a power tube Q2 and a capacitor C2, the buck circuit is composed of an inductor L2, a power tube Q3, a power tube Q4 and a capacitor C1, the gates of the power tube Q1 and the power tube Q2, the gates of the power tube Q3 and the power tube Q4 are connected with the control circuit respectively; the control circuit adopts double closed loop control of voltage outer ring and current inner ring or single current loop control to realize forward boost discharge control mode or reverse buck charging control mode of the power converter.
[0006] Further, the control circuit adopts double closed loop control of voltage outer ring and current inner ring to realize forward boost discharge control mode of the power converter, at this time, the battery pack discharges to stabilize the bus side voltage of the power converter or the battery pack discharges at constant current, when the input voltage is 300V, the output voltage is 540V, the maximum voltage of the capacitor C2 is 300V and the maximum current is 15V.
[0007] Further, the control circuit adopts a single current loop control to control the battery pack current, realize the reverse buck charging control mode of the power converter, and adopt a two-stage constant current constant voltage charging strategy for the battery pack, at this time, the output voltage of the power converter is clamped by the battery pack voltage, when the input voltage is 540V, the output voltage is 300V, the capacitor C1 is charged through the buck-boost circuit to charge the battery pack.
[0008] Further, the power tube Q1, the power tube Q2, the power tube Q3 and the power tube Q4 adopt an insulated gate enhanced P-MOS tube.
[0009] The power converter has the advantages that: the buck-boost two-circuit is adopted, the use amount of power devices is reduced, the overall cost and loss of the power converter are reduced, the rated working efficiency of the power converter is improved, and the 300V to 540V boost and 540V to 300V buck control functions are realized, when the battery pack is charged, the constant current charging is adopted in the initial charging stage, the problem of too large initial charging current is avoided, when the battery pack voltage reaches the set value, the constant voltage charging is adopted, the charging current is gradually reduced, the overcharging or undercharging of the battery pack is avoided, and the power converter based on the buck-boost topology is conducive to popularization and use. BRIEF DESCRIPTION OF DRAWINGS
[0010] Figure 1 is the schematic diagram of the application; Figure 2 is the principle block diagram of the forward boost control algorithm of the control circuit of the application; Figure 3 is the reverse charging control block diagram of the control circuit of the application; Figure 4 is the current voltage waveform diagram in the two-stage constant current constant voltage charging mode of the application.
[0011] In the figure: 1, a DC stabilized power supply; 2, a boost circuit; 3, a buck circuit; 4, a battery pack; 5, a control circuit. DETAILED DESCRIPTION
[0012] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.
[0013] Please refer to Figures 1-4It provides a technical scheme, a power stabilizing power converter based on a buck-boost topology, which comprises a DC stabilized power supply 1, a battery pack 4 and a control circuit 5. The DC stabilized power supply 1 and the battery pack 4 are connected in parallel with a buck-boost two-circuit, the buck-boost two-circuit is connected with the control circuit 5, the buck-boost two-circuit has a boost circuit 2 and a buck circuit 3. The boost circuit 2 is composed of an inductor L1, a power tube Q1, a power tube Q2 and a capacitor C2. The buck circuit 3 is composed of an inductor L2, a power tube Q3, a power tube Q4 and a capacitor C1. The gates of the power tube Q1 and the power tube Q2, the gates of the power tube Q3 and the power tube Q4 are respectively connected with the control circuit 5. The power tube Q1, the power tube Q2, the power tube Q3 and the power tube Q4 are insulated gate enhanced P-MOS tubes but are not limited to the same. The control circuit 5 adopts a double closed loop control of voltage outer ring and current inner ring or a single current loop control to realize a forward boost discharging control mode or a reverse buck charging control mode of the power converter.
[0014] As shown in the combination Figure 2 In the embodiment, the control circuit 5 adopts a double closed loop control of voltage outer ring and current inner ring to realize a forward boost discharging control mode of the power converter. At this time, the battery pack 4 discharges to stabilize the bus side voltage of the power converter or the battery pack 4 discharges with constant current. When the input voltage is 300V, the output voltage is 540V, the maximum voltage of the capacitor C2 is 300V, the maximum current is 15V, and the capacitor C2 is a super capacitor. The bus voltage sampling signal Vbus_s is subtracted from the voltage reference Vbus_ref. The error signal is amplified by the voltage loop and used as the current loop reference. The current loop output determines the transmission power size.
[0015] As shown in the combination Figure 3 And Figure 4 In the embodiment, the control circuit 5 adopts a single current loop control to control the current of the battery pack 4 and realize a reverse buck charging control mode of the power converter. A two-stage constant current constant voltage charging strategy is adopted for the battery pack 4. At this time, the output voltage of the power converter is clamped by the voltage of the battery pack 4. When the input voltage is 540V, the output voltage is 300V. The capacitor C1 is charged through the buck-boost circuit to charge the battery pack 4. The capacitor C1 is a super capacitor.
[0016] Wherein, in the initial charging stage, constant current charging is adopted to avoid the problem of too large initial charging current, and constant voltage charging is adopted after the voltage of the battery pack 4 reaches the set value Vset, and the charging current gradually decreases to avoid overcharging or undercharging; in the reverse charging mode of the power converter, the output voltage is clamped by the voltage of the battery pack 4; the error signal is obtained by subtracting the reference current Ibat_ref from the battery pack 4 side current sampling signal Ibat_s, and the result of the current loop amplification determines the size of Dp, thereby realizing the control of the charging current, and the current reference is calculated by the constant current constant voltage charging curve based on the voltage sampling signal Vbat_s of the battery pack 4 side.
[0017] The power smoothing power converter based on the buck-boost topology takes the power smoothing power converter with a rated working power of 6 kW as an example. When the power smoothing power converter works in the reverse buck mode, the input voltage is 540 V, and the output voltage is 300 V. At this time, the power smoothing power converter charges the super capacitor with a voltage of 300 V, and the charging time is less than 5 s. When the power smoothing power converter is in the positive working state, the power smoothing power converter works in the boost mode, the input voltage is 300 V, and the output voltage is 540 V. At this time, the super capacitor is discharged with a maximum voltage of 300 V and a maximum current of 15 A. The super capacitor voltage gradually decreases while the current remains 15 A unchanged. The discharge response time is less than 1.5 ms, and the super capacitor can be discharged quickly.
[0018] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered as within the scope of the present disclosure.
[0019] The above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent; it should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application; in the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements; among them, the detachable mounting mode has many ways, for example, it can be connected through the cooperation of plug-in and buckle, and for example, it can be connected through bolt connection, etc.
[0020] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.
Claims
1. A power smoothing power converter based on buck-boost topology, characterized in that: The system includes a DC regulated power supply, a battery pack, and a control circuit. A buck-boost circuit is connected in parallel between the DC regulated power supply and the battery pack. The buck-boost circuit is connected to the control circuit. Each buck-boost circuit has a boost circuit and a buck circuit. The boost circuit consists of an inductor L1, power transistors Q1 and Q2, and a capacitor C2. The buck circuit consists of an inductor L2, power transistors Q3 and Q4, and a capacitor C1. The gates of power transistors Q1 and Q2, and the gates of power transistors Q3 and Q4, are respectively connected to the control circuit. The control circuit employs a dual closed-loop control (outer voltage loop, inner current loop) or a single current loop control to achieve either a forward boost discharge control mode or a reverse buck charge control mode for the power converter.
2. The power smoothing converter based on buck-boost topology according to claim 1, characterized in that: The control circuit adopts a dual closed-loop control with an outer voltage loop and an inner current loop to realize the positive boost discharge control mode of the power converter. At this time, the battery pack discharges to stabilize the bus voltage of the power converter or the battery pack performs constant current discharge. When the input voltage is 300V, the output voltage is 540V, and the maximum voltage of capacitor C2 is 300V and the maximum current is 15V.
3. A power smoothing power converter based on buck-boost topology according to claim 1, characterized in that: The control circuit adopts single current loop control to control the battery pack current and realize the reverse buck charging control mode of the power converter. The battery pack adopts a two-stage constant current and constant voltage charging strategy. At this time, the output voltage of the power converter is clamped by the battery pack voltage. When the input voltage is 540V, the battery pack output voltage is 300V. The buck-boost circuit charges capacitor C1 to charge the battery pack.
4. A power smoothing power converter based on buck-boost topology according to claim 1, characterized in that: The power transistors Q1, Q2, Q3 and Q4 are insulated gate enhancement type P-MOS transistors.