CLLC bidirectional DC-DC converter
A DC converter, bidirectional DC technology, applied in the direction of converting DC power input to DC power output, and intermediate conversion to AC conversion equipment, instruments, etc., can solve the problem of high frequency ripple current, high cost, increased cost, etc. problem, to achieve the effect of reducing high-frequency current ripple, reducing volume and cost, and increasing control cost
Inactive Publication Date: 2020-07-24
VIRIDI E MOBILITY TECH NINGBO CO LTD +2
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Problems solved by technology
[0003] (1). The number of power semiconductor devices is large, and the corresponding drive circuits are also large, resulting in a large volume and high cost of the bidirectional DC-DC converter;
[0004] (2). Parallel connection of two full-bridge CLLCs or staggered parallel connection on the control will make the high-frequency ripple current of the output filter capacitor larger, and the effective value of the ripple current can reach 32% of the output current at most. The required output filter capacitor more in number;
[0005] (3). Parallel connection of two full-bridge CLLCs needs to increase the current sharing control circuit, which will also increase the cost
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[0029] In order to further explain the technical means and effects that the present invention adopts to achieve the intended purpose of the invention, the specific implementation, structure, and characteristics of the CLLC bidirectional DC-DC converter proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. And effect, detailed description is as follows.
[0030] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Through the description of specific implementation methods, the technical means and effects of the present invention to achieve the intended purpose can be understood more deeply and specifically, but the attached drawings are only for reference and description, and are not used to explain the present invention limit. ...
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The embodiment of the invention discloses a CLLC bidirectional DC-DC converter, and belongs to the technical field of power electronics. The CLLC bidirectional DC-DC converter comprises a primary sidefilter capacitor, a primary side three-phase bridge, a primary side resonance device, a voltage transformation device, a secondary side resonance device, a secondary side three-phase bridge and a secondary side filter capacitor which are connected in sequence. In the invention, hardware has a current sharing capability, an additional current sharing control circuit is not needed, and cost is greatly reduced.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a CLLC bidirectional DC-DC converter. Background technique [0002] At present, in the application of high-voltage and high-power isolated bidirectional DC-DC converters, limited by the selection of power devices, it is difficult to realize a single full-bridge CLLC. The commonly used circuit topology is to use two full-bridge CLLCs in parallel. The parallel connection of two full-bridge CLLCs means that the two full-bridge CLLCs work in parallel, each full-bridge CLLC shares half of the power, and the number of power semiconductor devices is 16. Each full-bridge CLLC can realize bidirectional conversion of energy. However, the currently adopted technical solution of parallel connection of two full-bridge CLLCs mainly has the following three disadvantages: [0003] (1). The number of power semiconductor devices is large, and the corresponding drive circuits are also l...
Claims
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IPC IPC(8): H02M3/28H02M3/335H02M1/14
CPCH02M1/14H02M3/28H02M3/3353Y02B70/10
Inventor 蒋劲松杜晓笏桂杰明庄启超郭水保
Owner VIRIDI E MOBILITY TECH NINGBO CO LTD