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- In Fig. 1(a), an RCD snubber is paralleled with the power switch. The power storage in the capacitor Cs during turn-off period must be dissipated by the resistor Rs
' _- n6 g, I2 h M: _while S is turned on. The disadvantage is increasing the turn-on current of switch. - The improved scheme is shown in Fig. 1(b). It can be observed that the capacitor energy is discharged by the parallel resistor directly, and it will not cause additional current on the power switch while the switch is turned on.
- For flyback converter, a transient voltage suppressor (TVS) shown in Fig. 1(c) is widely employed in low power applications. Ds and Dz are used to reduce the leading-edge voltage spike and ringing caused by transformer leakage inductance to a safe value. ) `5 C! i9 M: L2 S7 J
2 B8 b* \1 e9 L; ^ _, x5 c3 |8 s+ O# A; U# A) o. T1 k
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发表于 2018-5-2 11:11
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发表于 2018-5-2 21:08
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