Isolation type soft switching LLC-SC direct-current converter with self-adaptive adjustment resonant cavity
An LLC-SC, self-adaptive adjustment technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, control/regulation systems, etc., can solve the problem of unbalanced stress of magnetic components, difficulty in designing magnetic components, and increased switching loss and other issues to achieve the effect of ensuring reliable operation, good output voltage regulation characteristics, and switching loss suppression
Pending Publication Date: 2020-10-23
TIANJIN UNIV
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Problems solved by technology
One is to increase the switching loss and affect the conversion efficiency
The second is the unbalanced stress of the magnetic components, which makes the design of the magnetic components difficult
[0006] Generally speaking, the conversion efficiency and voltage gain characteristics of resonant DC converters limit each other and contradict each other, and this problem needs to be further resolved
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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0029] This embodiment provides an isolated soft-switching LLC-SC DC converter with adaptive adjustment of the resonant cavity. The converter is mainly composed of three parts, including a bridge inverter circuit and a resonant cavity that can be adaptively adjusted according to the input voltage. circuit and the diode rectifier circuit, these three parts are connected in sequence. When the converter is working, the bridge inverter circuit converts the DC input voltage into a square wave voltage; after that, the electric energy is converted into sinusoidal electric energy through the action of the resonant cavity circuit; then the transformer is used to realize the AC transformation a...
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The invention discloses an isolation type soft switching LLC-SC direct-current converter with a self-adaptive adjustment resonant cavity. The isolation type soft switching LLC-SC direct-current converter comprises a bridge type inverter circuit, a resonant cavity circuit and a diode rectifying circuit which are connected in sequence, wherein the resonant cavity circuit comprises a resonant inductor, a first capacitor, a resonant capacitor, an auxiliary switch tube and a transformer with an excitation inductor; one end of the resonant inductor is connected with midpoints of bridge arms of a first switching tube and a third switching tube, and the other end is connected with one end of a primary side of the transformer; the other end of the primary side of the transformer is connected with one end of the first capacitor, and the other end of the first capacitor is connected with midpoints of bridge arms of a second switching tube and a fourth switching tube; one end of a secondary side of the transformer is connected with midpoints of bridge arms of a first diode and a third diode; the other end of the secondary side of the transformer is connected with midpoints of bridge arms of asecond diode and a fourth diode; and the auxiliary switch tube is connected in series with the resonant capacitor and then connected in parallel with the resonant inductor.
Description
technical field [0001] The invention relates to the field of DC converters, in particular to an isolated soft-switching LLC-SC DC converter with self-adaptive adjustment of a resonant cavity, which has the characteristics of wide voltage range adjustment capability, high efficiency and the like. Background technique [0002] In recent years, with the shortage of fossil energy and the urgent need for ecological environment protection, the development and utilization of renewable energy has opened up new ways to solve global energy and environmental problems. However, the output voltage of renewable energy sources such as photovoltaics, wind energy, and fuel cells will fluctuate greatly with changes in the external environment. Therefore, it is often necessary to convert the electricity generated by new energy sources to a suitable voltage level through a DC converter, and then use inverter technology to supply it to users. [0003] In renewable energy systems, fuel cells wit...
Claims
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IPC IPC(8): H02M3/335
CPCH02M3/33569H02M1/0058Y02B70/10
Inventor 王议锋刘瑞欣韩富强杨良侯宇琦陈梦颖吴啸尘程鹏宇
Owner TIANJIN UNIV