５．Conclusion

　The high-freqency AC link single-phase DC-AC converter which is hoping to apply for the household DSG system or the UPS have been commonly used the symmetrical control scheme to control the output voltage. We have described in this paper the operation principle and some features of symmetrical control scheme and have pointed out the some problem which is an increase of conduction losses and the soft-switching operation range have an limitation by load. These problem can be solved to apply the secondary phase-shifted PWM control scheme. Therefore, we have proposed a switching pattern which is inverter mode and rectifier mode at the secondary phase-shifted PWM control into the high-frequency AC link single-phase DC-AC converter. And, we have been confirmed that the proposed scheme can be controlled satisfactorily in the inductive load or the capacitor-input by simulating analysis. Thus, the secondary phase-shifted PWM control scheme have elucidated applicable to the high-frequency AC link single-phase DC-AC converter. To confirm the reduction of conduction losses in the proposed scheme, let us calculate the conduction loss generating the high-frequency AC link single-phase DC-AC converter with secondary phase-shifted PWM control and symmetrical control scheme and compare them and perform the consideration. The result show that all conduction losses generating the high-frequency AC link single-phase DC-AC converter was reduced to 81% by performing the secondary phase-shifted PWM control comparing with the symmetrical control. Especially, the proposed scheme have elucidated drastic reduction of conduction losses generating high-frequency inverter and transformer. For this reason, the high-frequecny AC link single-phase DC-AC converter seem to be suitable for the dispersed storage and generation system inverter such us used the power storage system or used both. Especially, in the case of setting up the respective home, they will be required strongly the achieving small size and light weight, enhancing control performance and efficiency, and reduction of EMI noise from consideration for around information apparatus. The proposed scheme, high-frequency AC link single-phase DC-AC converter with secondary phase-shifted PWM control scheme can be not only reduced conduction losses but also performed the soft-switching operation in all switching regardless of the load state. Therefore, to apply the secondary phase-shifted PWM control scheme is effective for the high-frequecny AC link single-phase DC-AC converter system realizing achieving small size and light weight, enhancing control performance and efficiency.

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