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AN3095 数据表(PDF) 22 Page - STMicroelectronics |
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AN3095 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 55 page ![]() DC-AC converter AN3095 22/55 Doc ID 16555 Rev 3 The LCL filter is effective only if proper damping is added. Passive damping, realized with a resistor series connected to the filter capacitor was used for this application. The value of the resistor is chosen to be one third of the impedance of the capacitor at the resonant frequency: Equation 47 ● Selection of semiconductor devices The semiconductors selected for the DC-AC section are 600 V, 35 A IGBTs with internal fast diodes used to minimize the effect of recovery at turn-on. The choice of IGBTs is a trade off between cost and efficiency. The part number of the device used is STGW35HF60WD, which shows very good performance in terms of switching losses. The electrical characteristics of this device are shown in Table 5. The power losses in each IGBT may be calculated considering conduction losses, switching losses and diode losses. Conduction and switching losses in IGBTs may be evaluated according to the following equations: Equation 48 Ω = ω = 8 . 5 C * * 3 1 R res damp Table 5. STGW35HF60WD electrical characteristics Part number Saturation voltage Collector current Eoff Eon Gate charge STGW35HF60WD VCEsat @125 °C,13 A IC@100 °C Eoff @125 °C,15 A Eon @125 °C,15 A Qg 1.8 V 37 A 360 µJ Rg=47 Ω 300 µJ Rg=56 Ω 102 nC Ω = = φ = = = = = π = = π = = φ π + + φ + π = 02 . 0 R 1 cos 72 . 0 450 325 V V ma V 8 . 1 V W 62 . 1 f Eoff off _ Psw W 94 . 1 f Eon on _ Psw W 6 . 9 ) cos 3 ma 8 1 ( * I * R ) cos ma 8 1 2 1 ( I * V Pcond CE bus pk _ grid CE sw sw pk 2 CE pk CE Where |
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