A Flyback Converter with Constant Frequency Operation + Current Critical Continuous
A flyback converter, critical continuous technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, high-efficiency power electronic conversion, etc., can solve the problem that the flyback converter cannot obtain current critical continuous and constant frequency work at the same time and other issues, to achieve the effect of reducing current stress, reducing conduction loss and improving efficiency
Active Publication Date: 2019-03-08
东台城东科技创业园管理有限公司
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Problems solved by technology
[0005] In order to overcome the shortcoming that the flyback converter cannot obtain current critical continuous and constant frequency operation at the same time, it is necessary to find a flyback converter that has the above two characteristics at the same time, which can optimize the design of the output filter in the flyback converter and can Reduce the conduction loss of the device in the flyback converter, the iron loss and copper loss of the transformer, and improve the efficiency of the converter
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[0016] Below in conjunction with specific embodiment, further illustrate the present invention.
[0017] Such as figure 1 Shown is a flyback converter with constant frequency operation + current critical continuous, including transformer primary side circuit, self-inductance variable high frequency transformer T, rectification side circuit and voltage control current source; the transformer primary side circuit includes Input power U in With the switch tube S with an antiparallel diode, the input power supply U in The negative end of the switch tube S is connected to the source; the self-inductance variable high-frequency transformer T includes the first coil W1, the second coil W2, the third coil W3 and the fourth coil W4, and the self-inductance variable high-frequency transformer T The terminal with the same name of the first coil W1 is connected with the input power U in The positive end of the self-inductance variable high-frequency transformer T is connected to the po...
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The invention discloses a flyback converter with constant frequency operation and critical current continuity. Bias coils are introduced into the left and right magnetic core columns of the flyback transformer to adjust the self-inductance of the transformer in the flyback converter. The size of the processing power of the exciting converter determines the self-inductance value of the transformer, so as to ensure that the flyback converter can realize the critical current continuous operation under the constant frequency working state. On the one hand, the invention solves the contradiction between the constant frequency operation and the current critical continuous operation of the traditional converter, and optimizes the design of the output filter; Pass loss, transformer iron loss and copper loss, improve the efficiency of the converter. The invention is very suitable as a pre-stage DC / DC converter of a low-power photovoltaic micro-inverter.
Description
technical field [0001] The invention relates to a converter, in particular to a constant frequency operation + current critical continuous flyback converter, which belongs to the field of power electronic converters. Background technique [0002] In recent years, in order to solve the problem of fossil energy shortage, governments of various countries have introduced a number of related policies to promote the development of new energy. Among them, photovoltaic power generation is generally considered to be a high-efficiency, low-cost, pollution-free, and easy-to-use renewable energy. A form of efficient utilization of photovoltaic power generation is to transmit electric energy to the grid, and its power generation forms include centralized power generation and modular power generation. The centralized power supply method has low cost and high efficiency, but the redundancy is not high, and some uncertain factors will have an adverse effect on the maximum power point tracki...
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IPC IPC(8): H02M3/335
CPCH02M3/335H02M1/0048H02M1/0054Y02B70/10Y02E10/56
Inventor 阚加荣彭思敏吴云亚徐宁吴冬春商志根薛迎成
Owner 东台城东科技创业园管理有限公司