UM0324 datasheet(31/105 Pages) STMICROELECTRONICS

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UM0324

Running the demo program

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3.3.1

Connecting the two ICS sensors to the motor and to STR750

In order for the implemented IFOC algorithm to work properly, it is necessary to ensure that

the software implementation of the 75x_svpwm_ICS module and the hardware connections

of the two ICS are consistent.

As illustrated in Figure 16, the two ICS must act as transducers on motor phase currents

coming out of the inverter legs driven by STR750 PWM signals PWM1 (Phase A) and

PWM2 (Phase B). In particular, the current coming out of inverter Phase A must be read by

an ICS whose output has to be sent to the analog channel specified by the

PHASE_A_CHANNEL parameter in MC_pwm_ics_prm.h. Likewise, the current coming out

of inverter Phase B must be read by the other ICS and its output has to be sent to the

analog channel specified by the PHASE_B_CHANNEL parameter in MC_pwm_ics_prm.h.

About the positive current direction convention, a positive half-wave on

PHASE_X_CHANNEL is expected, corresponding to a positive half-wave on the current

coming out of the related inverter leg (see direction of I in Figure 16).

Figure 16.

ICS hardware connections

3.3.2

Selecting PHASE_A_CHANNEL and PHASE_B_CHANNEL

Default settings for PHASE_A_CHANNEL and PHASE_B_CHANNEL are respectively

ADC_CHANNEL11

and ADC_CHANNEL10. You can change the default settings if the

hardware requires it by editing the MC_pwm_ics_prm.h file. However, there are a few rules

to follow when selecting the new ADC channels:

●

You must initialize the proper GPIOs as analog inputs; an example for channel 8 is

given below:

/* ADC Channel 8 pin configuration */

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_29;

GPIO_Init(GPIO0, &GPIO_InitStructure);

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