| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a switching mode power supply for making automatically making the voltages of two buffer capacitors that are connected in series and balanced automatically, without having to connect a voltage balancing resistor, the large size of which causes heat loss, and in parallel with two buffer capacitors that are connected in series. <P>SOLUTION: A switched mode power supply system comprises two buffer capacitors CB1, CB2 connected between DC input terminals A1, A2; primary inductance units N1, NP2 connected in series with two switches SW1, SW2 that are connected in series; and a secondary coil Ns to be connected with a DC output circuit. The switched mode power supply system further comprises a current injection module 12, which causes current imbalance in a center point PMC of the two buffer capacitors CB1, CB2; and a balancing circuit 15 one end of which is connected to the center point PMC of the two buffer capacitors CB1, CB2 to balance leak currents of the capacitors. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
