A control method and device for a step-down circuit
A technology of step-down circuit and control method, applied in output power conversion devices, control/regulation systems, photovoltaic power generation, etc. Small voltage and power fluctuations, suppressing output voltage fluctuations, and ensuring stable transition effects
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[0048] In the field of photovoltaic power generation, the grid-connected inverter usually adopts a two-stage structure of DC / DC converter and DC / AC converter, in which the DC / DC converter completes the conversion of DC voltage, and the DC / AC converter converts the DC / DC The DC output from the converter is converted to AC at the desired frequency. Among them, the DC / DC converter can adopt a step-up conversion circuit, a step-down conversion circuit, or a conversion circuit with both step-up and step-down functions. In order to improve efficiency, the DC / DC converter usually adopts a bypass structure, that is, Together with the bypass circuit connected in parallel, it forms a step-down circuit.
[0049] In the actual working process, the step-down conversion circuit and the bypass circuit will continuously switch working states according to actual needs. However, in the prior art, voltage or power fluctuations at the input side are easily caused when such a working state is swi...
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