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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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UM0324 데이터시트(PDF) 43 Page - STMicroelectronics |
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UM0324 데이터시트(HTML) 43 Page - STMicroelectronics |
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43 / 105 page  UM0324 Library functions 43/105 Figure 22. Three shunt topology current sampling and GP A/D conversions integration (REP_RATE=1) 4.2.5 Tuning delay parameters and sampling stator currents in three shunt resistor topology Figure 23 shows one of the three inverter legs with the related shunt resistor: Figure 23. Inverter leg and shunt resistor position To indirectly measure the phase current I, it is possible to read the voltage V providing that the current flows through the shunt resistor R. It is possible to demonstrate that, whatever the direction of current I, it always flows through the resistor R if transistor T2 is switched on and T1 is switched off. This implies that in order to properly reconstruct the current flowing through one of the inverter legs, it is necessary to properly synchronize the conversion start with the generated PWM signals. This also means that current reading cannot be performed on a phase where the duty cycle applied to the low side transistor is either null or very short. |
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