High-voltage bidirectional power supply module based on DAB topology

Abstract

The invention discloses a high-voltage bidirectional power supply module based on DAB topology, which comprises an inductor, a transformer and a control circuit, the primary side of the transformer is connected with a first full bridge, the secondary side of the transformer is connected with a second full bridge, and the control circuit adopts a voltage and current double closed loop to control the phase shift duty ratio between the primary side first full bridge and the secondary side second full bridge. Therefore, bidirectional power transmission of forward discharging and reverse charging is realized. According to the invention, the DAB topology, the control circuit of the digital signal processor and the parallel design of a plurality of SiCMOSFETs are adopted, the phase shift control and ZVS control of the full bridge of the primary side and the secondary side of the transformer can be realized without the capacity expansion of the parallel connection of a plurality of power modules, the switching loss and the device stress are reduced, and a reliable scheme is provided for the bidirectional energy transmission of a high-voltage bus and an energy storage system.

Description

A high-voltage bidirectional power supply module based on DAB topology Technical Field

[0001] This invention relates to the field of airborne aviation bidirectional power converter technology, specifically a high-voltage bidirectional power module based on DAB topology. Background Technology

[0002] As a key electronic conversion device, bidirectional power modules enable bidirectional energy flow and precise control between DC systems and have become a core component of modern energy systems. They are widely used in applications requiring bidirectional power transmission, such as energy storage and electric vehicles. However, existing bidirectional power modules require the parallel connection of multiple power devices for capacity expansion, resulting in high switching losses and device stress, making it difficult to meet the requirements of 1.5 times overload and twice short-circuit current for airborne applications. Summary of the Invention

[0003] The purpose of this invention is to provide a high-voltage bidirectional power supply module based on DAB topology to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage bidirectional power supply module based on DAB topology, comprising an inductor, a transformer, and a control circuit. The primary side of the transformer is connected to a first full-bridge, and the secondary side of the transformer is connected to a second full-bridge. The first full-bridge consists of parallel power transistors S11, S12, S13, and S14, and the second full-bridge consists of parallel power transistors S21, S22, S23, and S24. When the output voltage of the first full-bridge exceeds the output voltage of the second full-bridge, power flows in the forward direction; when the output voltage of the first full-bridge lags behind the output voltage of the second full-bridge, power flows in the reverse direction. The turns ratio of the primary to the secondary side of the transformer is 2:1. The control circuit is connected to the gates of the power transistors of the first and second full-bridges, respectively. The control circuit uses a voltage-current dual closed-loop control to control the phase shift duty cycle between the primary first full-bridge and the secondary second full-bridge to achieve bidirectional power transmission for forward discharge and reverse charging.

[0005] Furthermore, the forward discharge power transmission controlled by the control circuit is a 500V-560V input voltage converted to a 270V output, and the reverse charging power transmission controlled by the control circuit is a 260V-280V input voltage with an output voltage of 540V.

[0006] Furthermore, the control circuit has a digital signal processor with a built-in triple phase-shift control algorithm to achieve phase-shift control and ZVS control of the full bridge of the primary and secondary sides of the transformer.

[0007] Furthermore, the digital signal processor is a TMS320F28335 processor.

[0008] Furthermore, the power transistors S11, S12, S13, S14, S21, S22, S23, and S24 are all SiC MOSFETs.

[0009] The beneficial effects of this invention are as follows: This invention adopts a DAB topology, a digital signal processor control circuit, and a parallel design of multiple SiC MOSFETs. It can realize phase shift control and ZVS control of the full bridge of the primary and secondary sides of the transformer without the need for expansion of multiple power modules in parallel. This reduces switching losses and device stress, achieves reliable operation of power conversion, provides a reliable solution for bidirectional energy transmission between high-voltage buses and energy storage systems, and has excellent dynamic response and anti-interference capabilities. The output voltage is stable and the ripple is low, which is conducive to the promotion and use of this high-voltage bidirectional power supply module based on DAB topology. Attached Figure Description

[0010] Figure 1 is a circuit topology diagram of the high-voltage bidirectional power supply module of the present invention; Figure 2 is a block diagram of the dual closed-loop and feedforward control of the TPS control circuit of the present invention.

[0011] In the diagram: 1. First full bridge; 2. Inductor; 3. Transformer; 4. Second full bridge; 5. Control circuit. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] Please refer to Figures 1-2, which provide a technical solution for this invention: a high-voltage bidirectional power supply module based on DAB topology, including an inductor 2, a transformer 3, and a control circuit 5. The primary side of the transformer 3 is connected to a first full-bridge 1, and the secondary side of the transformer 3 is connected to a second full-bridge 4. The first full-bridge 1 consists of parallel power transistors S11, S12, S13, and S14. The second full-bridge 4 consists of parallel power transistors S21, S22, S23, and S24. The first full-bridge 1 also has a capacitor C1 connected in parallel, and the second full-bridge 4 also has a capacitor C2 connected in parallel. The power transistors S11, S22, S23, and S24 are connected in parallel. Power transistors S12, S13, S14, S21, S22, S23, and S24 are all SiC MOSFETs. Power flows in the forward direction when the output voltage of the first full-bridge 1 exceeds the output voltage of the second full-bridge 4, and in the reverse direction when the output voltage of the first full-bridge 1 lags behind the output voltage of the second full-bridge 4. The primary to secondary turns ratio of transformer 3 is 2:1. To reduce the size of magnetic components, the switching frequency is set to 100kHz. The single high-voltage bidirectional power supply module is set to a power level of 10kW for the input and output voltage levels and the existing power transistor levels.

[0014] In this embodiment, the control circuit 5 is connected to the gates of the power transistors of the first full-bridge 1 and the second full-bridge 4 respectively. The control circuit 5 uses a voltage and current dual closed-loop control to control the phase shift duty cycle between the primary side first full-bridge 1 and the secondary side second full-bridge 4 to achieve bidirectional power transmission for forward discharge and reverse charging. The forward discharge power transmission controlled by the control circuit 5 is a 500V-560V input voltage converted to a 270V output, which meets the requirements of 1.5 times overload and twice the short-circuit current. The reverse charging power transmission controlled by the control circuit 5 is a 260V-280V input voltage and an output voltage of 540V. The control circuit 5 has a digital signal processor, which has a triple phase shift control algorithm embedded in it to realize the phase shift control and ZVS control of the primary and secondary full-bridges of the transformer 3. The digital signal processor is a TMS320F28335 processor.

[0015] It should be noted that control circuit 5 adopts a direct power control strategy to achieve voltage and current regulation. After obtaining an output power reference value, it combines a triple phase-shift control algorithm to obtain a set of phase-shift angles. This power reference value is generally the output of the voltage loop. In order to achieve short-circuit current limiting, a current loop also needs to be added. The output of the current loop is multiplied by the output voltage to obtain the output power reference value. This power reference value is calculated by the loop and is not the actual required power, so it is called virtual direct power control. In order to accelerate the dynamic response speed, power feedforward is added, which is the output current feedforward control. The actual output power and the output power of the current loop are used together as the input of the triple phase-shift control algorithm.

[0016] This high-voltage bidirectional power supply module based on DAB topology, used as a bidirectional converter in electronic conversion equipment, enables bidirectional energy flow and precise control between DC systems. It has become a core component of modern energy systems and can establish a bidirectional power channel between the DC bus and energy storage devices, efficiently managing energy flow and solving the problems of voltage intermittency and instability in the power grid. Especially in DC microgrid systems, the bidirectional converter connects energy storage devices such as batteries and supercapacitors to the DC bus, achieving bidirectional energy transmission and greatly improving the system's flexibility and reliability. This high-voltage bidirectional power supply module based on DAB topology has a power density of no less than 3.5 kW / kg. The control circuit 5 features a TMS320F28335 digital signal processor, enabling the high-voltage bidirectional power supply module based on DAB topology to meet the comprehensive needs of analog signal acquisition, status signal acquisition, PWM wave output, fault reset, and other functions. It also expands to an external AD converter to achieve high-precision, multi-channel analog signal acquisition and uses high-speed linear optocouplers and operational amplifiers to achieve dynamic response. This high-voltage bidirectional power supply module based on DAB topology has completed the system modeling, phase shift control algorithm design, electromagnetic parameter matching, magnetic component selection, PCB layout optimization, and prototype debugging and verification of the DAB converter. The system operates stably across the entire load range, with high power density, small size, and light weight, meeting the comprehensive requirements of aviation equipment for high efficiency and lightweight.

[0017] In summary: This high-voltage bidirectional power supply module based on DAB topology employs a control circuit 5 with a digital signal processor, enabling rapid adjustment of the output voltage. It can also adjust the output current limit and various protection requirements in real time, meeting the adaptability requirements of airborne temperature environments, mechanical environments, power supply compatibility, and electromagnetic compatibility. This high-voltage bidirectional power supply module based on DAB topology has a rated input of 540V, an output of 270V, and a rated power of 10kW. Based on the energy transmission direction and voltage transfer ratio K, the operating conditions of the high-voltage bidirectional power supply module can be divided into four categories: forward buck, forward boost, reverse buck, and reverse boost. The energy transmission direction is Vin to Vout and Vout to Vin. The voltage transfer ratio K is greater than 1 for forward buck, less than 1 for forward boost, greater than 1 for reverse boost, and less than 1 for reverse buck.

[0018] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0019] The above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be understood that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. In the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a mechanical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Among these, there are various ways of detachable installation, such as by using a combination of plug-in and snap-fit, or by using bolt connections, etc.

[0020] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage bidirectional power supply module based on DAB topology, characterized in that: The system includes an inductor, a transformer, and a control circuit. The primary side of the transformer is connected to a first full-bridge circuit, and the secondary side is connected to a second full-bridge circuit. The first full-bridge circuit consists of parallel power transistors S11, S12, S13, and S14, while the second full-bridge circuit consists of parallel power transistors S21, S22, S23, and S24. When the output voltage of the first full-bridge circuit exceeds the output voltage of the second full-bridge circuit, power flows in the forward direction. When the output voltage of the first full-bridge circuit lags behind the output voltage of the second full-bridge circuit, power flows in the reverse direction. The turns ratio of the primary to the secondary side of the transformer is 2:

1. The control circuit is connected to the gates of the power transistors in both the first and second full-bridge circuits. The control circuit uses a voltage-current dual closed-loop control to manage the phase shift duty cycle between the primary first full-bridge circuit and the secondary second full-bridge circuit, thereby achieving bidirectional power transmission for forward discharge and reverse charging.

2. The high-voltage bidirectional power supply module based on DAB topology according to claim 1, characterized in that: The control circuit controls the forward discharge power transmission by converting a 500V-560V input voltage to a 270V output, and the control circuit controls the reverse charging power transmission by converting a 260V-280V input voltage to a 540V output voltage.

3. The high-voltage bidirectional power supply module based on DAB topology according to claim 1, characterized in that: The control circuit has a digital signal processor with a built-in triple phase-shift control algorithm to achieve phase-shift control and ZVS control of the full bridge of the primary and secondary sides of the transformer.

4. A high-voltage bidirectional power supply module based on DAB topology according to claim 3, characterized in that: The digital signal processor used is a TMS320F28335 processor.

5. A high-voltage bidirectional power supply module based on DAB topology according to claim 1, characterized in that: The power transistors S11, S12, S13, S14, S21, S22, S23, and S24 are all SiC MOSFETs.

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