3.4 Electric Parameters

Power supply for HALL sensors and position encoders: 5V or 3.3V.

The PIC32MK MCM control board triggers the OC event if the regulated DC bus current signal arrives ${\displaystyle \frac{1}{2}AVDD}$. Recall that ${\displaystyle I_{oc}=\frac{AVDD}{2\times R_{shunt}^{bus}\times G^{bus}}}$

Where,

${\displaystyle R_{shunt}^{bus}}$ is the shunt resistance

${\displaystyle G^{bus}}$ is the regulating circuit’s gain for the DC bus current sample signal

AVDD is the analog power supply voltage for the ADC

For the PIC32MK MCM control board, ${\displaystyle G^{bus}=11.111;AVDD=3.3V}$. With the default shunt resistance 0.025Ω, it yields ${\displaystyle I_{oc}=5.94A}$.

A bigger ${\displaystyle I_{oc}}$ can be achieved by selecting a smaller shunt resistance. However in order to make sure ${\displaystyle I_{oc}\le I_{rated}}$, the shunt resistance ${\displaystyle R_{shunt}^{bus}}$ is recommended to be not less than 0.00495Ω.

Recall that ${\displaystyle I_{range}^{phase}=\frac{AVDD}{2\times R_{shunt}^{phase}\times G^{phase}}}$

Where,

${\displaystyle G^{phase}}$is the regulating circuit’s gain for the phase current sample signal

AVDD is the analog power supply voltage for the ADC

For the PIC32MK MCM control board, ${\displaystyle G^{phase}=11.111;AVDD=3.3V}$, with the default shunt resistance 0.025Ω, it yields ${\displaystyle R_{range}^{phase}=5.94A}$.

Similarly, ${\displaystyle I_{range}^{bus}=\frac{AVDD}{2\times R_{shunt}^{bus}\times G^{bus}}}$, where ${\displaystyle G^{bus}}$ is the gain for the regulating circuit for the DC bus current sample signal.

For the PIC32MK MCM control board, ${\displaystyle G^{bus}=11.111}$, with the default shunt resistance 0.025Ω, it yields ${\displaystyle I_{range}^{bus}=5.94A}$.