The principle of variable frequency power supply is composed of AC - DC - AC parts, namely AC DC, DC to AC, first of all use 220 v alternating current into DC rectifier bridge, and then use DC into AC converter bridge, in the process of the converter AC frequency converter are can be controlled, specific important SPWM and SVPWM algorithm two kinds, here a brief introduction of the principle of SPWM, use the triangle wave as a carrier, you hope to get the sine wave modulation wave, compares two waves produce PWM, repass sine wave filter for get you want.
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