Figure 12 The waveform of S(x). A practical relay always exhibits hysteresis modeled by
Related Figures (20)
Ramon O. Caceres, Member, IEEE, and Ivo Barbi, Senior Member, IEEE ig. 2. Circuit used to generate an ac voltage larger than the dc input voltage. Fig. 1. The conventional VSI or buck inverter. Fig. 3. A basic approach to achieve dc-ac conversion, with boost charac- teristics. Fig. 4. The current bidirectional boost dc-dc converter. phase, then the output voltage is given by Fig. 5. The proposed dc-ac boost converter. Fig. 7. The boost inverter controlled by sliding mode. where ‘+ is the status of the switches, v and 7 are the vectors of the state variables (271, Vi) and their time derivatives, respectively, Wie Sas SAS Rede eT eee Be Savaete! | SOhr: SiS ANE STR ~The state-spi space modeling of the equivalent circuit with state variables iz; and V, is given by Fig. 8. Equivalent circuit for the boost inverter. the converter ratings and switch type. The system behavior is completely determined by coefficients A, and K2, which must be selected so as to satisfy existence and ensure stability and fast response, even for large supply and load variations. According to the variable structure system theory, the converter equations must be written in the following form: Fig. 13. Boost inverter scheme with sliding mode controller. Fig. 17. Voltage across the capacitor C, (50 V/div-2 ms/div). Fig. 16. Current through the inductor L, (5 A/div-2 ms/div). Fig. 15. Resistive load operation (50 V/div-2A/div-2 ms/div). Fig. 14. Output voltage, nonload (50 V/div-2 ms/div). Fig. 18. Inductive load operation (50 V/div-2 A/div-2 ms/div). Fig. 21. Voltage and current in the nonlinear load (100 V/div-2 A/div-2 ms/div). Fig. 20. Voltage Vo, and current through the inductor Ly (50 V/div-2 A/div-2 ms/div). Fig. 19. Nonlinear load used with the boost inverter.
