Unable to activate over current protection on ST Workbench (6.1.2) with a custom board

[IrianJ]

Hello, 

I've made a custom card and I'm stuck on two features in particular:
- over-current protection
- Current sensing

They don't show up in the ST Workbench Pannel. 

[VERSION]: 6.1.2
[TOOL]: MC WB

[DETAILS]:

here is an extract of my custom board  (current Sensing): 

 

 {
 "name": "CurrentSensing",
 "type": "CurrentSensing",
 "tRise": 59, 
 "hwVariants": [
 {
 "type": "SingleShunt_AmplifiedCurrents_noOffset",
 "shuntResistor":0.0005,
 "opAmpGain":20,
 "amplifyingNetworkImax":330,
 "amplifyingNetworkVm":3.3,
 "amplifyingNetworkPrating":10, 
 "signals": {
 "CURRENT_AMPL": [
 {
 "name": "PA3",
 "help": "",
 "cost": 0
 }
 ]
 }
 }
 ]
 }

 

And for overcurrent protection : 

 

{
 "name":"OverCurrentProtection",
 "type":"OverCurrentProtection",
 "hwVariants": [
 {
 "type":"SingleInput_RawCurrents_Protection_IntRef",
 "OCNetworkGain":20,
 "OCNetworkOffset":0,
 "OCComparatorThreshold":2,
 "OCSignalPolarity": "Active high",
 "signals": {
 "CURRENT_INPUT_P":[
 {
 "name":"PA7",
 "help":"",
 "cost":0
 }
 ]
 }
 }
 ]
 }

 

Yet, on WB view, I got these  : 

I'm working on a custom Inverter with a STM32G431RTBx and all the other features show up well. 

[EXPECTED BEHAVIOR]:be able to activate overcurrent protection and current sensing. 

 

Thank for your help, 

Irian

[SRedd.5]

The B-G431B-ESC1  Kit based on STM32G431CB i used this, there are other boards with RB series i think. 

The board B-G431B has current sensing

and over current protection. After generating the code you may need to make changes as per your requirements.

 

[cedric H]

Hello @IrianJ,

Do you want to use FOC algorithm or 6-steps ?

What is you targeted MCU? 6-steps algo is supported on a limited series compared to FOC.

Do you use a ST board you want to modify as a starting point ? if yes which one ?

SingleShunt_AmplifiedCurrents_noOffset is dedicated to 6-steps because the current sampled is always positive.

 

Regarding the OverCurrent protection, may I ask you what is your driver? Most of the time drivers have a Fault signal that is use in the MCSDK for the Driver Protection feature. Your Hardware Variant makes use of raw currents, it means non-amplified current ( connected directly from the shunt). I guess it is not your use case.

Regards

Cedric

 

[IrianJ]

Hello @cedric H, 

Thank you for your time and your reply.

Here's a bit more background on my use of the tool. I want to evaluate the software generated by ST Workbench on our own motor controllers and motors  (which run today on our own  software).

- I want to use 6-steps only. MCU used is a STM32G431RBT6 (which is compatible with FOC and 6-steps). I am not starting from a ST board  but I'm using them as examples to build my controller's board description. 

The driver used is DRV8350RSRGZR but  we want the software to be as driver-independent as possible, as the driver may change in the near future and it already has two single-shunt (redundant) current measurements in place.

You are right ! We do not use raw current ! We have two amplified current input. I want to use one for current sensing, and the other for overcurrent potection with a internal comparator and internal generated reference (as we do in our proprietary software). The two currents  inputs have the same amplification ratio. Maybe this is impossible with the workbench ? 

 

Regards,

Irian