AN2030 datasheet(4/13 Pages) STMICROELECTRONICS

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AN2030 Arkusz danych(PDF) 4 Page - STMicroelectronics

Numer części	AN2030

Szczegółowy opis	BACK EMF DETECTION DURING PWM ON TIME BY ST7MC

PDF	13 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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4 / 13 page

4/13

BACK EMF DETECTION DURING PWM ON TIME BY ST7MC

Coes is not a fix value for IGBTs, which depends on the voltage. Figure 4 shows the curve for

STGB7NB60HD.

Figure 4. Coes curve

Assuming the back EMF has just passed the rising edge of the zero crossing. When PWM is

off, the voltage across the capacitor will be discharged in a resonant way. Figure 5 shows a

terminal voltage and the current waveform.

Figure 5. Waveform of floating phase terminal voltage and inductor current

At the time t0, PWM is off.

t0 t1 t1’ t2

10 m A /d iv

t0 t1 t1’ t2

10 m A /d iv

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