Single-stage-type photovoltaic off-grid inverter with high frequency rectification control and control method thereof
A high-frequency rectification and high-frequency transformer technology, applied in the field of electricity, can solve the problems of micro-inverter battery boards not isolated, difficult to increase the power, and increase the volume of the inverter, so as to improve the overall efficiency and reliability, reduce the Small size, reduce the effect of control difficulty
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[0020] The main structure of the single-stage photovoltaic off-grid inverter with high-frequency rectification control in this embodiment includes a reverse cut-off diode D, a capacitor C i , Resonant capacitance C r , the first switching tube Q 1 , Freewheeling diode D Q1 , high-frequency transformer 1, first high-frequency rectification control circuit 2, second high-frequency rectification control circuit 3, fourth switching tube Q 4 , the fifth switching tube Q 5 , filter capacitor C f , filter inductance L f , a first voltage sampling circuit 4, a first current sampling circuit 5, a second voltage sampling circuit 6, a second current sampling circuit 7, an output voltage sampling circuit 8, a flyback power supply 9, a control microcontroller 15, a first drive circuit 20, The second drive circuit 21, the third drive circuit 22, the fourth drive circuit 23 and the fifth drive circuit 24; the input voltage U i through the reverse blocking diode D and by the capacitor C...
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