Rc over diode

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Snubber Design Tips:

Citat: "... If you have any ringing waveforms in your power circuit, these waveforms must be damped or they can lead to device failure, excessive EMI, or instability. In many cases, you can damp a ringing waveform with a series RC network across the offending device ... Try an initial value of snubber resistor of R = Z. This usually suffices to control the ringing. ..."

Citat: "... Answer: Since the boost diode conducts in the reverse direction until it recovers, the turn-on of the power MOSFET is controlled by the diode characteristics, not the power MOSFET or its drive. In fact, best performance is usually had by matching the turn-on of the MOSFET to the diode by slowing down the MOSFET ..."

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Kig især på SiC dioder - de overflødiggør stort set RC-dæmpeleddet(eng. snubber network) over diode(rne) pga. af ultra fast recoverytid(

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Fra:

Er adressen på et eks. på et firma som masseproducerer SiC dioder fundet

- med datablade:

thinQ!? 600V SiC Diodes.

600V Silicon Carbide Ultrafast Schottky Diode: eller Citat: "... Features: * Revolutionary semiconductor material - Silicon Carbide * Switching behavior benchmark * No reverse recovery * No temperature influence on the switching behavior ..."

Infineon Technologies Produces Worlds first Power Semiconductors in Silicon Carbide:

(adresseindhold ændret - desværre) Citat: "...Due to its unique characteristics, the silicon carbide (SiC) material has high blocking voltage capability (up to 3500V) resulting in a higher schottky barrier, ten times higher electrical breakdown field strength, and a thermal conductivity comparable with that of copper. ..."

mvh/Glenn

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