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MT700 Service Manual

4.1.5.2. Flyback Circuit

In a flyback converter operated in the discontinuous mode, the energy stored in the

flyback transformer must be zero at the beginning and end of each swiching period.

During the on-time energy is stored in the transformer and energy taken from the

transformer when the switching transistor turn-off, the stored energy is all delivered

to the output.

4.1.5.3. Rectifiers Circuit

Choosing the best rectifiers for any switching power supply design is an important

process. The rectifiers are the largest source if loss within switching power supplies.

To choose the best rectifier, one must understand the parameters that affect their

efficiency. The most important rectifier parameters are the forward voltage (Vf) and

the reverse recovery time. The forward voltage drop creates a loss just by having

voltage across the device while high currents are flowing through it. And the shortest

reverse recovery time will be minimized the loss.