| 摘要 |
A digitalized double-excitation uninterrupted switching power supply comprises a main transformer (T) provided with a primary coil (N1) and a secondary coil (N2), a main loop, a synchronous rectification output loop, a synchronous direct current converting circuit and a digital center control unit. The main loop comprises high voltage switching networks (Q1, Q2, Q3, Q4), a resonant inductor (Lr), the primary coil (N1) and a resonant capacitor (Cr). The synchronous rectification output loop comprises a current-double rectifier and filter circuits (L1, L2, C) connected to two output ends (E1, E2) of the current-double rectifier, and the current-double rectifier is constructed by connecting two synchronous rectifier tubes (Q5, Q6) and the secondary coil (N2) in parallel, and the synchronous rectifier tubes (Q5, Q6) are connected in series oppositely. The synchronous direct current converting circuit comprises two low voltage switching tubes (Q7, Q8), an isolation diode and a low voltage direct current source (LVDC). The digital center control unit automatically selects, according to the voltage change of a high voltage direct current bus, either the main loop or the synchronous direct current converting circuit to work, and provides stable DC output. The digitalized double-excitation uninterrupted switching power supply is small in size, low in cost, and can effectively ensure stable power output. |
