Page 87 - Rashid, Power Electronics Handbook
P. 87
5 Power Bipolar Transistors 73
FIGURE 5.24 Flyback converter.
be kept relatively low, normally <50%, that is, d < 0:5. In secondary turns ratio, and the output load current. When
practice, the duty-cycle is taken at 0:4, which limits the peak the transistor turns on, the primary current builds up in the
collector. A second design factor the transistor must meet is primary winding and thus stores energy, as the transistor turns
the working collector current at turn-on, dependent on the off, the diode at the secondary winding is forward biasing,
primary transformer-choke peak current, the primary-to- which releases the stored energy into the output capacitor and
FIGURE 5.25 Isolated forward converter.
