A bidirectional clllc-dcx resonant converter and its control method

Abstract

The invention discloses a bidirectional CLLLC-DCX resonant converter and a control method thereof. The converter of the invention includes two ports, two resonant circuits, two switch circuits and a transformer. The bidirectional CLLLC-DCX resonant converter disclosed by the present invention has a symmetrical circuit structure and consistent forward and reverse working performance. Under the control method of the present invention, the ZVS or ZCS soft switching of the switching tubes on the input side and output side can be well realized , can achieve constant voltage gain under normal load, and due to the existence of auxiliary diodes, the converter has the function of bidirectional automatic power limitation, and at the same time realizes the natural bidirectional flow of energy in forward and reverse operation modes, improving the efficiency and reliability of the converter .

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and more specifically relates to a bidirectional CLLLC-DCX resonant converter and a control method thereof. Background technique [0002] In recent years, DC-DC converters have been widely used in various fields, especially in various power supply systems such as high-voltage direct current transmission including energy storage units, micro-grids, and electric vehicles. With the continuous improvement of energy conversion requirements in the field of power electronics technology, converters are gradually developing towards high frequency, high efficiency, and high power density, and the energy storage unit of the above system needs to control energy when charging and discharging. The power converter is required to have the characteristics of bidirectional controllable power flow, so the demand for bidirectional and high frequency isolation is also increasing. [0003] Among the ...

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Problems solved by technology

[0004] In order to solve the problems of asymmetry and control logic switching and constant gain, the invention discloses a bidirectional CLLLC-DCX resonant converter and a synchronous equal pulse width control method for controlling the converter. The topology of the converter Symmetrical, the technical problem to be solved is that the ZVS or ZCS soft switching of the MOS transistors on the input side and the output side can be well realized, and the constant voltage gain under normal load and the function of bidirectional power limitation of the converter can be realized, while positive and negative Natural bi-directional flow of energy towards the operating mode, improving the efficiency and reliability of the converter

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