Bidirectional series resonant converter and improved intermittent sinusoidal modulation method thereof

Abstract

The invention discloses a bidirectional series resonant converter and an improved intermittent sinusoidal modulation method thereof. Wherein the main circuit comprises switching networks, an LC series resonance network and an ideal transformer, the turn ratio of the ideal transformer is n: 1, the two switching networks of a primary side and a secondary side are full-bridge networks, and the primary side and the secondary side are each composed of four MOS tubes; the full-bridge port of the primary side is connected with the LC series resonance network, the resonance inductor is Lr, and the resonance capacitor is Cr. Pulse control is added in switching periods, each switching period of the modulation method comprises a sinusoidal modulation resonance period and a current-controllable intermittent period, and the modulation method not only has the sinusoidal modulation advantages of zero-current on-off and zero-backflow power, but also realizes linear power regulation in a wide power range. Voltage boosting and voltage reducing can be achieved through voltage gain, the wide working range is achieved, meanwhile, power loss is in direct proportion to the switching frequency, efficiency is irrelevant to loads, and efficient transmission of energy can be achieved.

Description

technical field [0001] The invention relates to the technical field of switching power supplies in the field of power electronics, in particular to a bidirectional series resonant converter and an improved intermittent sinusoidal modulation method thereof. Background technique [0002] The ever-increasing environmental pollution and the shortage of traditional energy sources such as coal, oil and natural gas have become increasingly prominent. It is urgent to develop and utilize renewable energy and improve the energy structure in various fields and industries. Therefore, new energy vehicles have gradually become a research hotspot. A battery energy system is a short-term or long-term energy buffer for stable energy delivery. In the battery energy system, the bidirectional DC-DC converter is essential, it connects the high-voltage DC bus to charge and discharge the battery. [0003] The bidirectional DC-DC converter can realize the bidirectional flow of energy. At present...

AI Technical Summary

Problems solved by technology

However, it can only work as a Buck converter under frequency conversion control, resulting in limited working range

[0005] (2) Phase-shift modulation (PSM) can achieve power regulation in a wide voltage gain range, but there is a large circulating current, and the return power increases the conduction loss

However, also this method can only work as a Buck converter, resulting in a limited working range

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