Re: CAN Bus protection (100VDC)

StanV wrote:

We designed a machine where we have at some place the CAN-bus signals
and HighVoltage power (100VDC and 220VAC) on the same cable.

So , we are just awaiting a faulty cable or connector to get these
voltages on the bus.

Opto-isoloating every nodes seems to be complex. I also found some new
maxim CAN-driver that is protected upto 80VDC. Unfortunatly we are
unable to change the CAN drivers inside the nodes.

...but you can consider change to opto-isioation ?


I also found a few other components for protecting a CAN bus , but they
are mostly intended for voltages upto 24V.

In what direction could i look for protection components, or maybe it
is just to difficult to protect the bus for such levels ?

Any pointers very welcome.

If these are on the same cable and share 'coal face' connectors, then yes - hmmmm...

You have a couple of protection issues. Highest priority should be personnel : if mains _does_ get onto the CAN, what fuses where ?
[can 220VAC end up on the PCBs and CAN network, with a broken GND trace ]

Fusible resistors could be one solution, if you can find one that promises to keep back mains.

Transformer isolated busses are another solution, as are isolated BUS drivers.

-jg

.

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