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STPM32 Datasheet(PDF) 49 Page - STMicroelectronics |
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STPM32 Datasheet(HTML) 49 Page - STMicroelectronics |
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49 / 121 page  DS10272 Rev 8 49/121 STPM32, STPM33, STPM34 Theory of operation 121 Basic calculations are listed in Table 14: Table 14. STPM3x basic calculations Parameter Voltage Current shunt Current CT Current Rogowski coil Gain AV = 2 AI = 16 AI = 2 AI = 16 Calibrators(1) calV = 0.875 calI = 0.875 Sensitivity kS = RShunt [ kS = kRoCoil [VA Voltage at channel inputs Integrator gain (for Rogowski coil sensor only) -kint = 1 kint = 0.8155773 ΣΔ bitstream(2) Input active power Active power LED frequency at rated power (3) Constant pulse Pulse value Power register normalized R2 R1 R2 + --------------------[V/A] kS Rb N -------[V/A] = VinV R2 R1 R2 + -------------------- V[V] = VinC kS I[V] = V VinV AV Vref ---------- = V VinC AI Vref ---------- = V VinC AI Vref Kint ------------------------ = Pin VI V I[W] = cos = CP 1 2 --- R2 R1 R2 + -------------------- kint k S AV AI calV calI Vref 2 ------------------------------------------------ DClk LED_PWM ------------------------------ pulses Ws ------------------- = |
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