Bidirectional series resonant converter and improved intermittent sinusoidal modulation method thereof

A series resonance and sinusoidal modulation technology, applied in the direction of DC power input conversion to DC power output, AC power input conversion to DC power output, instruments, etc., can solve the problem of large circulating current, limited working range, and increased return power communication loss etc.

CN114665720APending Publication Date: 2022-06-24CHINA UNIV OF GEOSCIENCES (WUHAN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-06-24

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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.
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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...

Examples

Embodiment Construction

[0039] Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0040] At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0041] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with refer...