Hi,
We are making an SMPS which will be at the end of a 300m cable.
The Vin is 700VDC. This is from an isolated 700VDC source.
Pout = 12Kw. (48vout)
It will comprise “units” comprising of a vicor BCM module feeding four vicor DCM modules…..and these “units” paralleled in a whopping group of 10 to give the 48V, 12Kw output.
We need to connect the chassis of the BCM modules to chassis ground or earth………also, the App notes state that under each DCM module there must be a copper plane, which is connected to either chassis ground or earth.
The thing is, we don’t have an separate earth wire going to our product, and cant have this.
We will simply be using 700VDC negative as our chassis ground.
Also, we plan to connect the 700VDC negative to Earth…(so as to avoid this isolated output getting induced up to some high voltage).
Do you think these measures are appropriate?
BCM datasheet
DCM datasheet
Also, what must we connect our Y caps to if we only have a “go” and “return” going to the product?...and the chassis ground is our “return”
…Or is it that we should simply just implement common mode EMC protection with a common mode choke only?
The BCM and DCM modules are transformer isolated………so we believe to a considerable extent we can combat common mode noise by simply connecting primary and secondary with shorts……this will short out the transformer stray capacitances from primary to secondary we believe. Would you agree?
We are making an SMPS which will be at the end of a 300m cable.
The Vin is 700VDC. This is from an isolated 700VDC source.
Pout = 12Kw. (48vout)
It will comprise “units” comprising of a vicor BCM module feeding four vicor DCM modules…..and these “units” paralleled in a whopping group of 10 to give the 48V, 12Kw output.
We need to connect the chassis of the BCM modules to chassis ground or earth………also, the App notes state that under each DCM module there must be a copper plane, which is connected to either chassis ground or earth.
The thing is, we don’t have an separate earth wire going to our product, and cant have this.
We will simply be using 700VDC negative as our chassis ground.
Also, we plan to connect the 700VDC negative to Earth…(so as to avoid this isolated output getting induced up to some high voltage).
Do you think these measures are appropriate?
BCM datasheet
DCM datasheet
Also, what must we connect our Y caps to if we only have a “go” and “return” going to the product?...and the chassis ground is our “return”
…Or is it that we should simply just implement common mode EMC protection with a common mode choke only?
The BCM and DCM modules are transformer isolated………so we believe to a considerable extent we can combat common mode noise by simply connecting primary and secondary with shorts……this will short out the transformer stray capacitances from primary to secondary we believe. Would you agree?