IHM16M1 how to override interlocking protection?

[Jeffrey1]

Hello

I am working on an academic research project involving a hybrid converter topology, where a controlled shoot-through state is intentionally required as part of the converter’s operating principle.

I am currently using:

• STM32F446RE

• IHM16M1 inverter driver board

• MCSDK (Motor Control SDK)

From my understanding, the IHM16M1 gate driver enforces hardware-level interlocking and dead-time, which prevents simultaneous conduction of the high-side and low-side devices in each inverter leg. Even when overlapping PWM signals are generated at the MCU level, the driver appears to mask them internally.

My question is:

• Is there any supported or undocumented method to override or bypass the hardware interlocking / cross-conduction protection on the IHM16M1 board?

I would like to clarify whether:

• This limitation is strictly hardware-bound, or

• Any alternative configuration (timer mode, driver pin usage, or hardware modification) exists that could allow controlled shoot-through for research purposes.

Thank you for your time and support.

[AScha.3]

Hi,

just from ds STSPIN830 :

So driving shoot-through is prevented by chip design.

[Jeffrey1]

Hi @AScha.3 

Thank you for your response. 

But can you suggest anyway, any solution from ST or any board modification or any other board which could be useful? 

[AScha.3]

Hi,

Just explain what a controlled shoot through should be and how you want to control the shoot, without generating a lot of EMI or destruction of the mosfet.

Afaik some sync buck controller doing something like this, but with some adaptive regulation of the current crossover (Ti had a article about this some years ago).

Basically you could use every hi+lol side driver with independent channels, so without cross conduction prevention.

But be ready to blow up some driver+ mosfet sets, until you know all the problems...

btw  >suggest anyway, any solution from ST 

https://www.st.com/resource/en/datasheet/l6385e.pdf

L6385  has independent hi/lo side drivers.

[Jeffrey1]

Thank you for your response 

Just explain what a controlled shoot through should be and how you want to control the shoot, without generating a lot of EMI or destruction of the mosfet.

So the idea is as below circuit diagram 

In this topology, the shoot-through interval is deliberately introduced as a control mode. During this interval, both the upper and lower devices of a phase leg are turned ON for a very short duration, while the current rise is limited by the input inductors and the DC-link energy storage network.

From my understanding, IHM16M1 provides six independent PWM inputs to the gate driver stage but has interlocking protection is there and as per your previous answer it cannot be override. 

But us their other boards (Especially eval boards) Which can support my requirements?

L6385 has independent hi/lo side drivers. yes, it does I think it is discontinued. 

Thanks in Advance for your response. 

Best regards 
Jeffrey J

[AScha.3]

Ok, i see....    What should it do better than all the existing "standard" inverters (with deadtime) ?

+

>their other boards (Especially eval boards) Which can support my requirements?

Dont know any, sorry.

btw

My last/actual inverter has about 50ns deadtime, switching 15kW output power at about 99% efficiency.

[Jeffrey1]

Ok, i see....    What should it do better than all the existing "standard" inverters (with deadtime) ?

> so I am thinking to tap out DC and AC from same circuit 

Dont know any, sorry.
Sure no problem 

btw

My last/actual inverter has about 50ns deadtime, switching 15kW output power at about 99% efficiency.

Oh okay, did you build it on your own? 
Now I am thinking I have to go by building my own inverter so I can switch as I please. 
If you know any documentations or any other resources for easy to build inverter that would be great 

Thanks for the responses  

[AScha.3]

>Oh okay, did you build it on your own? 

Sure, its on 100x100mm Alu board (on heatsink), half-bridge with DC-DC + gate driver .

+

> so I am thinking to tap out DC and AC from same circuit 

makes no sense to me, but   ymmv. :)

+

>If you know any documentations or any other resources 

Some inspiration, whats possible: 100kW motor driver in size of your hand...

https://www.infineon.com/products/power/igbt/automotive-qualified-igbts/coolsic-mosfet-modules/hybridpack-drive-dc6

(But nothing to build yourself...)

maybe search + read...here

https://www.infineon.com/product-information/documentation-hub

or just google

https://www.google.com/search?q=buiding+mosfet+inverters&oq=buiding+mosfet+inverters&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIKCAEQABiABBiiBDIKCAIQABiABBiiBDIKCAMQABiABBiiBNIBCTIxMDI1ajBqNKgCALACAQ&sourceid=chrome&ie=UTF-8

[Jeffrey1]

Thank you for the support