Step-down type pure sine wave voltage conversion socket

A step-down type pure sine wave voltage conversion socket, comprising an alternating current (AC) input module (1) configured to receive and feed alternating current mains electricity to a rectifier and filter module (2), to rectify and filter the alternating current mains electricity into direct current;

• and
• further comprising a main control unit (3), an inverter bridge module (4), and a voltage and current feedback module (5), wherein the main control unit (3) generates a sinusoidal pulse width modulation (SPWM) signal to control an on-off state and a duty cycle of the inverter bridge module (4), so as to cause the inverter bridge module (4) to convert the direct current of the rectifier and filter module (2) into pulse voltage and output the pulse voltage to an energy storage and filter module (6);
• the inverter bridge module (4) comprises a plurality of switching transistors, an input end of the inverter bridge module (4) is connected to the rectifier and filter module (2), an output end of the inverter bridge module (4) is connected to the energy storage and filter module (6), an input end of the energy storage and filter module (6) is connected to the inverter bridge module (4), and the energy storage and filter module (6) is configured to filter the pulse voltage into pure sine wave alternating current voltage and output the pure sine wave alternating current voltage through an AC terminal;
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• the voltage and current feedback module (5) is connected to an output end of the energy storage and filter module (6), and is configured to detect output voltage and current and transmit a feedback signal to the main control unit (3), and the main control unit (3) adjusts the SPWM signal according to a feedback voltage and current signal, to stably output sine wave voltage.