II. PROPERTIES OF DIODES
Like any other semiconductors diode is not an ideal device. If the diode selection is incorrect for given application, then the diode parameters can increase the turn
– on losses of power transistor (MOSFET, IGBT) and even for the diode itself. Singularity of application areas leads to the development of various diode technologies of which
every have its specific abilities:
- Low VF with high Qrr and trr
- Moderate VF and moderate trr
- High VF and low trr
The mentioned development brings some types of special diodes; those behaviors could eliminate unacceptable effects during active or passive mode of device.
SBD - Schottky Barier Diode – this type of diode utilizes metal – semiconductor rectifying junction. The differences from PN junction are better dynamics – caused
by the existence of s.c. hot electrons, those life time is from 10-11 to 10-13, that is 106 times less than with classic PN diodes. This warrants almost zero – recovery time [9]. According to present development in the field of power electronics, standard Schottky barrier rectifiers based on silicon substrate had reached their threshold limits (reverse recovery time, reverse voltage, reverse recovery charge). Present development in the field of material engineering expects elimination of mentioned limitations by implementation of new progressive materials (silicon carbide - SiC diodes), or by combination of both Schottky and PN junction in the same device. In the next subchapter, both structures will be shortly introduced.
ครั้งที่สอง คุณสมบัติไดโอดเช่นไดโอดเซมิคอนดักเตอร์อื่น ๆ ที่ไม่ได้เป็นอุปกรณ์ที่เหมาะ หากเลือกไดโอดไม่ถูกต้องสำหรับการใช้งานที่กำหนดแล้วพารามิเตอร์ไดโอดสามารถเพิ่มการเปิด- ในการสูญเสียอำนาจของทรานซิสเตอร์ เอกพจน์ของการใช้งานนำไปสู่การพัฒนาของเทคโนโลยีไดโอดต่างๆซึ่งทุกคนมีความสามารถเฉพาะ- - - การพัฒนากล่าวถึงนำบางชนิดไดโอดพิเศษ พฤติกรรมเหล่านั้นสามารถกำจัดผลกระทบที่ยอมรับไม่ได้ในระหว่างโหมดการใช้งานหรือ SBD - กี - ชนิดของไดโอดนี้ใช้โลหะ- เซมิคอนดักเตอร์กลั่นทางแยก II. PROPERTIES OF DIODES
Like any other semiconductors diode is not an ideal device. If the diode selection is incorrect for given application, then the diode parameters can increase the turn
– on losses of power transistor (MOSFET, IGBT) and even for the diode itself. Singularity of application areas leads to the development of various diode technologies of which
every have its specific abilities:
- Low VF with high Qrr and trr
- Moderate VF and moderate trr
- High VF and low trr
The mentioned development brings some types of special diodes; those behaviors could eliminate unacceptable effects during active or passive mode of device.
SBD - Schottky Barier Diode – this type of diode utilizes metal – semiconductor rectifying junction. The differences from PN junction are better dynamics – caused
by the existence of s.c. hot electrons, those life time is from 10-11 to 10-13, that is 106 times less than with classic PN diodes. This warrants almost zero – recovery time [9]. According to present development in the field of power electronics, standard Schottky barrier rectifiers based on silicon substrate had reached their threshold limits (reverse recovery time, reverse voltage, reverse recovery charge). Present development in the field of material engineering expects elimination of mentioned limitations by implementation of new progressive materials (silicon carbide - SiC diodes), or by combination of both Schottky and PN junction in the same device. In the next subchapter, both structures will be shortly introduced.
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