DC inverter is the energy (battery, has battery) into alternating current (typically 220v50HZ sine or square wave).Emergency power supply, the general is to reverse into a 220V DC bottle exchange.Two main categories, one category is sine wave inverter, the other is square wave inverter.Sine wave inverter is the power we use every day with the same or even better sine wave AC power, because it does not exist in electromagnetic pollution grid.Square wave inverter output is low-quality square wave AC, the positive maximum to negative maximum value almost at the same time to produce, so that the load and the inverter itself, resulting in severe uncertainty.At the same time, its load capacity is poor, only 40-60% of rated load, not with inductive load.If the load carried by too large, square-wave current component included in the third harmonic will flow in the capacitive load current increases, and in severe damage to the load of the power supply filter capacitor.
As one of inventers, SPWM inventers can achieve low total harmonic distortion (THD) output wave. With the development of digital control techniques, the production of SPWM and digital control of inventers become convenient, which makes the output wave’s steady-state precision, transient and steady state response, reliability improved.
Hope this issue of the project's technology, combined with the characteristics and inverter SPWM sine wave inverter circuit for the existence of ordinary high-frequency loss big problem, of harmonic type and soft-switch technology sine wave invertertechnical solutions and implementation methods.The simulation and circuit experiment to achieve a 300W sine wave inverter and to analyze its effectiveness and cost.
Keywords:Inverter Sine wave Square Wave Frequency