Study on the dynamical characteristic for Voltage-feedback Push-Pull DC-DC converter

Voltage-feedback Push-Pull DC-DC converter, namely VCPPDC-DC, is a dominant component of SMPS system, has rich dynamical characteristic. For revealing internal relation between stability and system circuit parameters, VCPPDC-DC was studied in details. According to practical closed-loop control logic, the general simulation model was set up by using the exact state equations. And the general discrete mathematical model was deduced by stroboscopic maps. Through varying parameters, nonlinearity characteristic was simulated and analyzed by numerical method. Experiments results show that VCPPDC-DC is sensitive to transformer ratio, filter capacitor, inductive storage and error scale factor, while it is not sensitive to error integral coefficient and load. The research results could serve guidance for circuit parameters selection in VCPPDC-DC converter application.