1. TERNOPIL IVAN PUL’UJ NATIONAL TECHNICAL UNIVERSITY U K R A I N E Anna Yaskiv PhD student at Biotechnical faculty annyaskiv@gmail.com

2. Design of high-efficient high-frequency power converters is a topical task, and can not be completed without appropriate mathematical modeling. Here the following models are presented: 1. Interleaved series input parallel output (ISIPO) forward converter 2. Power factor corrector

3. ISIPO F ORWARD C ONVERTER C OMPARISON OF T OPOLOGIES a) Full-Bridge Converterb) Half-Bridge Converter c) Two-Transistor Converter d) Interleaved Series Input Parallel Output (ISIPO) Converter

4. Voltage (peak) and current (RMS) stresses

5. Full- Bridge Half- Bridge Two- Transistor ISIPO MOSFETs4222 Diodes (Low Power) 0022 Diodes (High Power) 2224 Transformers (Single) 0012 Transformers (Dual) 1100 Inductors1112 Capacitors1313 Component count

6. C OMPARISON OF T OPOLOGIES ISIPO advantages: reduced current stress on switches reduced output capacitor current ripple guaranteed reset of transformers and inductances - no Dmax restriction - no additional magnetizing reset circuit recycled leakage energy and magnetizing energy of the transformers, resulting in higher efficiency ISIPO disadvantages: increased number of components: a) lower reliability b) lower efficiency c) increased complexity d) increased cost e) poor volume utilization

7. C OMPONENTS D ESIGN FOR ISIPO

8. ISIPO simulation results Co=15.625uF Vo=100V (designed ripple 2%)

9. Ca=Cb=39uF Vcb=Vca=400V (designed ripple 1%)

10. Los1=Los2=0.2mH Io=50A (designed ripple 10%)

11. ISIPO SIMULATION RESULTS

12. Passive rectifier simulation Vo=48V, Po=500W, fs=100kHz, fl=69Hz, Vg=110Vrms

13. Comparison of converter’s properties with different L and C values L, mH (C=14 mF) 11.95 THD,%52.639.949.7 ∆Vo/Vo,%6.44.82.9 C, mF (L=1.9mH) 101420 THD,%40.339.939.7 ∆Vo/Vo,%7.74.83.4

14. S IMULATION OF THE FLYBACK CONVERTER WITH OCC, R O = CONST

15. OCC FLYBACK CONVERTER WAVEFORMS Clock D V Integrator Ig Vg Ig THD=1.6%

16. E RROR ESTIMATION RC=Ts RC=0.1Ts RC=10TS

17. is an AC voltage switch not critical to the form of input voltage gain on a current up to 1000 simplicity of the control circuit (1-2 transistors in a linear mode) does not create electromagnetic interferences is by the filter of input interferences (both in non-saturated, and in a saturated condition) high efficiency (99 %), the losses do not depend on load current high level of radiation stability and mechanical stability does not require protection (itself serves a protection device of high-frequency transistor inverter) multifunctionality: the power amplifier, power switching device, pulse- width modulator,executes functions of the integrator, comparator, protection device The advantages of magnetic switch: