Research On Sigle-phase Push-pull High Frequency Link Inverter Power Supply

Inverter technology is widely used,and effectively promotes the city power supply,energy saving and environmental protection,transportation,industrial automation and other fields,and also the core part of the uninterruptible power supply(UPS).With the development of communication technology,semiconductor technology and power sys-tem technology,the volume,weight,reliability,efficiency and environmental protection of inverter power supply require higher requirements.The low frequency inverter pow-er supply characterized by its weight,high cost,noisy and other shortcomings,are gradually replaced by high-frequency inverter power supply.Unidirectional high-frequency link voltage source inverter achieved miniaturized of the isolated in-verter,but still exists some problems,for example it has three times power conversion(DC-HFAC-DC-LFAC),with the power of one-directional flow.While,power with bi-directional flow,double power conversion(DC-HFAC-LFAC)high frequency link voltage source inverter is studied here.In writing ideas,firstly,the bipolar phase shift control technology of single-phase push-pull bidirectional voltage source high frequency link inverter is studied in this paper,its modulation control method and steady-state external characteristics are ana-lyzed in detail,while comparing with control principle of bi-directional controlling cy-cle transform,and analyzing the various modes of the control process.Results show that,using bi-directional switches to achieve cycle transform technology makes the cy-cle converter switches only work in the output voltage frequency in resistive or PFC load,while reduces the cycle converter switching losses,and simpler the control pro-cess.Then,the closed-loop control strategy of the single-phase high-frequency link in-verter is studied in this paper,and the double closed-loop control strategy of the inner inductor current loop proportional control,outer voltage loop quasi-PR control is stud-ied.The average model of single-phase high-frequency link inverter is established to design of the inner current loop and outer voltage loop,At the same time,the tracking performance of the controller of the inverter is analyzed.Then,established the sin-gle-phase push-pull full-wave high-frequency link inverter model by software MATLAB to verify the principle of bidirectional switches controlling cycle converter,and the steady-state and dynamic characteristicsof double closed-loop control.Finally,the experimental circuit of the single-phase push-pull ful-wave high fre-quency link inverter is designed,and the low power principle prototype is established,and the design metheds of the selection and design of the hardware system are intro-duced in detail.The experimental results verifyed the correctness and validity of con-trol strategy.