According to the basic principles of power inverter , using analysis of existing data is derived , presents a square wave inverter production methods and to debug .
The basic principle of a Car inverter knowledge system
The inverter power input for the battery (+12 V, capacity 90A · h), frequency output is a square wave voltage (50Hz, 310V). The block diagram shown in Figure 1 . Currently , new technologies constitute DC / AC inverter lot, but taking into account the specific conditions of use and cost, and reliability of the power supply still uses typical secondary transformation, ie DC / DC converter and a DC / AC inverter . First, the DC / DC converter to the inverter DC12V high frequency square wave voltage by boosting the high-frequency step-up transformer , and then rectified and filtered to obtain a stable DC voltage of about 320V ; then the DC / AC inverter for converting a square wave mode , will become a stable DC voltage rms slightly larger than the inverse square-wave voltage of 220V ; then obtained by LC filter frequency of 50Hz is 220V AC voltage to drive the load.
2 DC / DC conversion
Because of relatively low voltage side of the transformer primary , the transformer in order to improve the utilization of lower cost , DC / DC conversion shown in Figure 2 , push-pull circuit , the primary center tap connected to the battery , with the ends of the switch control , alternate work can improve the conversion 40A mppt charge controller efficiency. The push-pull circuit with fewer switching devices , double-ended working volume of the transformer is relatively small , the duty cycle can be increased , increasing the output power ....
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