127 Snubber Components Halfbridge
Components C3, C4, and Rl are often referred to as snubber components; they assist the turn-off action of the high-voltage transistors Q1 and Q2 so as to reduce secondary breakdown stress. As the transistors turn off, the transformer inductance maintains a current flow, and the snubber components provide an alternative path for this current; preventing excessive voltage stress during the turn-off action.
The conventional diode, capacitor, snubber circuit should not be used in the half-bridge connection, as it provides a low-impedance cross-conduction path during the turn-on transient of Q1 and Q2.
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