Tri-level double-end active bridge DC (Direct Current) conversion device and control method

Abstract

The invention discloses a tri-level double-end active bridge DC (Direct Current) conversion device and a control method. According to the tri-level double-end active bridge DC conversion device and the control method disclosed by the invention, a low-voltage rating switch tube can be adopted for realizing high-voltage high-power input and output, two-way real-time conversion of occasion demands can be realized by high-frequency electrical isolation energy, and the dynamic property is high, thereby being beneficial for reducing cost and improving power density and reliability; voltage sharing of a flying capacitor, a series switch device and a voltage-dividing capacitor under the working condition of the whole load and voltage variation range can be realized, thereby ensuring the safety of the device; and inner and outer pipes are decoupled, so as to realize zero-voltage-switching of the switch tube more easily, lower the switch loss of the device greatly and improve the efficiency and the electromagnetic compatibility.

Description

technical field [0001] The invention relates to a DC-DC electric energy conversion device, in particular to a three-level double-terminal active bridge DC conversion device and a control method suitable for high voltage, high power, bidirectional flow of energy and requiring electrical isolation. Background technique [0002] With the rapid development of technologies and related applications such as new energy power generation, large-scale energy storage, electric vehicles, and battery management, DC converters with energy bidirectional conversion functions have received more and more attention, and at the same time higher requirements have been proposed. Requirements, mainly manifested in higher voltage levels, power and electrical safety. The traditional three-level bidirectional Buck / Boost converter can meet the voltage level and power requirements, but it does not have the function of electrical isolation, and the electrical safety cannot be guaranteed; the traditional ...

AI Technical Summary

Problems solved by technology

The traditional three-level bidirectional Buck / Boost converter can meet the voltage level and power requirements, but it does not have the function of electrical isolation, and the electrical safety cannot be guaranteed; the traditional two-level double-ended active bridge can realize electrical Isolation, but need to choose high voltage rated switching tube

The high-voltage MOSFET switch tube has large on-state resistance and large conduction loss, which is not conducive to improving the efficiency of the converter; the high-voltage IGBT switch tube has serious current tailing, which limits the increase in switching frequency and is not conducive to improving power density; the switch tubes are connected in series , more complex circuits and controls are required to ensure better synchronous control and voltage equalization between series switch tubes

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