A pure sine wave inverter converts direct current (DC) to alternating current (AC) using internal power electronic devices such as IGBTs and MOSFETs. The key lies in how to generate an AC output that is close to an ideal sine wave. The specific steps are as follows:
DC Input: The inverter receives DC from a battery or other DC power sources.
DC Boost: The input DC voltage is increased to the required level through a boosting circuit to ensure the stability of the output voltage.
Pulse Width Modulation (PWM): Pulse Width Modulation technology is used to generate a waveform that approximates a sine wave. PWM technology controls the duty cycle of the output voltage through high-speed switching devices, making the final output voltage waveform close to a sine wave.
Filtering: A filter is used to further smooth the output voltage waveform, eliminate high-frequency harmonic components, and ensure that the output voltage is a high-quality sine wave.
AC Output: After the above processing, the inverter outputs an AC that is close to an ideal sine wave for the load to use.