UM0324 datasheet(37/105 Pages) STMICROELECTRONICS

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UM0324

Library functions

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SVPWM_3ShuntCurrentReadingCalibration

SVPWM_3ShuntGetPhaseCurrentValues

Synopsis

void SVPWM_3ShuntCurrentReadingCalibration(void);

Description

The purpose of this function is to store the three analog voltages

corresponding to zero current values for compensating the offset

introduced by the amplification network.

Input

None.

Returns

None.

Note

This function must be called before PWM outputs are enabled so that

the current flowing through inverter legs is zero. When using STR750

MC Kit, the power board (MB459B) must be supplied before the

control board (MB469B). This way, the current sensing conditioning

network will reach steady state before performing calibration.

Functions called

Standard library:

ADC_GetFlagStatus, ADC_ConversionCmd, ADC_Init,

ADC_ClearFlag, ADC_ITConfig

Motor control library:

SVPWM_3ShuntCalcDutyCycles

Synopsis

Curr_Components SVPWM_3ShuntGetPhaseCurrentValues(void);

Description

This function computes current values of Phase A and Phase B in

q1.15 format starting from values acquired from the A/D Converter

peripheral.

Input

None.

Returns

Curr_Components type variable.

Note

In order to have a q1.15 format for the current values, the digital value

corresponding to the offset must be subtracted when reading phase

current A/D converted values. Therefore, the function must be called

after SVPWM_3ShuntCurrentReadingCalibration.

Functions called None.

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