| 摘要 |
PCT No. PCT/SE81/00361 Sec. 371 Date Jul. 29, 1982 Sec. 102(e) Date Jul. 29, 1982 PCT Filed Dec. 8, 1981 PCT Pub. No. WO82/02294 PCT Pub. Date Jul. 8, 1982.A pulse width modulated power amplifier has a power section containing a transformer (T) with four windings. The windings (L1, L2) on the battery side are each connected by their end points to switch pairs (Pfa, Prb and Pfb, Pra) where each switch pair can conduct current in both directions. The windings (L3, L4) on the load side are adapted in the same way, with their end points connected to switch pairs (S1a, S2b and S1b, S2a), where each pair can conduct current in both directions. Input and output filters (IF and UF) are connected to the battery and load sides, respectively. The output voltage from the output filter (UF) is compared with the incoming signal (Ur) which is to be amplified, and the error signal (Uf) thus formed controls a pulse length modulator (PM), which sends control signals to the switch pairs. |
