The RC-RCD clamp circuit for fly-back converter

摘要

Fly-back converter is one of the most popular DC-DC converters for low power supply. Due to the transformer leakage inductance the converter suffer with the voltage spikes, which can be "controlled" by the dissipative RCD or non-dissipative LCD clamp circuits. Both of the clamp circuits consists the diode. The diode reverse recovery charge causes the oscillation, which results in additional dissipation of the clamp circuitry. The RC-RCD clamp circuit is used for damping the oscillation caused by clamp diode and consequently the dissipation in the circuitry is lower.