nvestigation of performance in the case of PFC converter
Second proposed converter is PFC converter in boost configuration (fig.11). The main parameters of proposed PFC converter are:
- input voltage: 85 Vac - 230 Vac
- output voltage: 400 Vdc ± 2%
- output power: 1 kW
- switching frequency: 100 kHz
Diodes which hava been selected for investigation were: - QH12TZ600, D12S600, C4D15120
It can be seen that during this experiment we had to focus on diodes with higher blocking voltage, and thus standard Schottky diode MBR20200CT was not able to be utilized. In first case it deals about Qspeed structure, and two other diodes are SiC, whereby the last C4D15120 presents last family from Infineon SiC diodes.
L D
+
AC Input EMI filter Rectifier T + C
DCOutput
-
PFC controller
Fig. 11. PFC converter in BOOST configuration
As in previous case, investigated parameter was efficiency of proposed PFC converter in wider power range. Next figure (fig.11) is showing waveforms of efficiency in dependency on output power. The measurements were provided for each diode at 25 ºC and at 230 Vac. Fig. 12 shows evaluation of measurement results at 25 ºC and 85 Vac
Both experiments on PFC circuit are showing that performance of utilized diodes is very similar. Very small deviations occured during low power loading in the case of C4D15120. It has to be said that this diode presents device, which is suited for high-performance applications. But main result of this experiment was investigation of dynamic properties of Qspeed diodes and consequent comparisson against SiC structure. As can be see, the performance of Qspeed is similar to SiC even its cost is much lower (fig.14).
93.00%
92.50%
92.00%
91.50%
91.00%
90.50%
90.00%
89.50%
89.00%
0 50 100 150 200 250 300 350 400 450 500
QH12TZ600 D12S600 C4D15120
Fig. 12. Efficiency of PFC converter for various types of diode in dependency on output power (W) at 230 Vac of input voltage
91.00%
90.50%
90.00%
89.50%
89.00%
88.50%
88.00%
87.50%
87.00%
0 50 100 150 200 250 300 350 400 450
Fig. 13. Efficiency of PFC converter for various types of diode on output power (W) at 85 Vac of input voltage
Fig. 14. Interpretation of "VALUE" of diodes based on various technology principle
VI. CONCLUSION
The parametrical measurements have demonstrated massive influence of circuit parameters on diode's turn-off losses. These experiments have discovered dynamic properties of selected diode structure and with the use of results in graphical interpretation it is possible to check turn-of losses as well as other part of losses and thus to realize proper dimensioning of final power electronic system. Aim of this work was to investigate in which manner is this dynamic behavior influencing performance of proposed electrical circuits. As was discovered, the price and performance of dedicated device can not be always suitable for each application as well as diodes with lower cost can achieve performance of that which are acting as top level class devices. Designers versed in the subtle performance of trade-offs and parasitic of the new diodes can optimize circuit efficiency and/or achieving meaningful reductions in overall system cost, size, weight and complexity [14] [15] [16]..
ACKNOWLEDGEMENT
The authors wish to thank to Slovak grant agency APVV for project no. LPP-0366-09, and to Slovak grant agency VEGA for project no. 1/0943/11. Next to to R&D operational program Centre of excellence of power electronics systems and materials for their components No. ITMS 2622012003.
nvestigation เสนอแปลงที่สองเป็นแปลงฉิบหายในการกำหนดค่าเพิ่ม ตัวแปรหลักของแปลง - - แรงดันเอาท์พุท± 2% - - เฮิร์ทซ์ไดโอดซึ่งhava จะเห็นได้ว่าในช่วงการทดลองนี้เราต้องมุ่งเน้นไปที่ไดโอดที่มีแรงดันไฟฟ้าที่สูงขึ้นการปิดกั้นและทำให้มาตรฐานไดโอด ในกรณีแรกมันเกี่ยวข้องเกี่ยวกับโครงสร้าง LD + AC DCOutput - ควบคุม รูป 11. เช่นในกรณีก่อนหน้านี้เป็นพารามิเตอร์การตรวจสอบประสิทธิภาพของการเสนอแปลงฉิบหายในช่วงพลังงานที่กว้างขึ้น รูปถัดไป nvestigation of performance in the case of PFC converter
Second proposed converter is PFC converter in boost configuration (fig.11). The main parameters of proposed PFC converter are:
- input voltage: 85 Vac - 230 Vac
- output voltage: 400 Vdc ± 2%
- output power: 1 kW
- switching frequency: 100 kHz
Diodes which hava been selected for investigation were: - QH12TZ600, D12S600, C4D15120
It can be seen that during this experiment we had to focus on diodes with higher blocking voltage, and thus standard Schottky diode MBR20200CT was not able to be utilized. In first case it deals about Qspeed structure, and two other diodes are SiC, whereby the last C4D15120 presents last family from Infineon SiC diodes.
L D
+
AC Input EMI filter Rectifier T + C
DCOutput
-
PFC controller
Fig. 11. PFC converter in BOOST configuration
As in previous case, investigated parameter was efficiency of proposed PFC converter in wider power range. Next figure (fig.11) is showing waveforms of efficiency in dependency on output power. The measurements were provided for each diode at 25 ºC and at 230 Vac. Fig. 12 shows evaluation of measurement results at 25 ºC and 85 Vac
Both experiments on PFC circuit are showing that performance of utilized diodes is very similar. Very small deviations occured during low power loading in the case of C4D15120. It has to be said that this diode presents device, which is suited for high-performance applications. But main result of this experiment was investigation of dynamic properties of Qspeed diodes and consequent comparisson against SiC structure. As can be see, the performance of Qspeed is similar to SiC even its cost is much lower (fig.14).
93.00%
92.50%
92.00%
91.50%
91.00%
90.50%
90.00%
89.50%
89.00%
0 50 100 150 200 250 300 350 400 450 500
QH12TZ600 D12S600 C4D15120
Fig. 12. Efficiency of PFC converter for various types of diode in dependency on output power (W) at 230 Vac of input voltage
91.00%
90.50%
90.00%
89.50%
89.00%
88.50%
88.00%
87.50%
87.00%
0 50 100 150 200 250 300 350 400 450
Fig. 13. Efficiency of PFC converter for various types of diode on output power (W) at 85 Vac of input voltage
Fig. 14. Interpretation of "VALUE" of diodes based on various technology principle
VI. CONCLUSION
The parametrical measurements have demonstrated massive influence of circuit parameters on diode's turn-off losses. These experiments have discovered dynamic properties of selected diode structure and with the use of results in graphical interpretation it is possible to check turn-of losses as well as other part of losses and thus to realize proper dimensioning of final power electronic system. Aim of this work was to investigate in which manner is this dynamic behavior influencing performance of proposed electrical circuits. As was discovered, the price and performance of dedicated device can not be always suitable for each application as well as diodes with lower cost can achieve performance of that which are acting as top level class devices. Designers versed in the subtle performance of trade-offs and parasitic of the new diodes can optimize circuit efficiency and/or achieving meaningful reductions in overall system cost, size, weight and complexity [14] [15] [16]..
ACKNOWLEDGEMENT
The authors wish to thank to Slovak grant agency APVV for project no. LPP-0366-09, and to Slovak grant agency VEGA for project no. 1/0943/11. Next to to R&D operational program Centre of excellence of power electronics systems and materials for their components No. ITMS 2622012003.
การแปล กรุณารอสักครู่..
