cupoftea
Advanced Member level 5
Hi,
We are doing Buck current sources (10A)
its 10A into a 60Volt "Battery".
Vin is 100V, but can be varied to suit.
There will be very many of these in parallel....and we want to pack them all tight, so we worry about noise.
Would you agree if we do the transistor isolated version of a Buck, ie, make them Two Transistor forwards, then it would be less noisy, as the leakage
inductance of the 2TF gives a nicer (not so rapid) ramp to the FET current at switch ON.
So two transistor forward is less noisy than Buck?
Eg Boost PFCs are known to be very noisy, as the fet switch on gobbles up a load of reverse recovery through the output diode...there is no leakage inductance to staunch this.
We do not need any isolation....(the vin is already isolated, and will be coming from a bank of supercaps)
EMC is not of any interest to us. But noise that will destroy the PWM controller operation obviously is.
(The load is only supplied for 100ms every half an hour)
We are doing Buck current sources (10A)
its 10A into a 60Volt "Battery".
Vin is 100V, but can be varied to suit.
There will be very many of these in parallel....and we want to pack them all tight, so we worry about noise.
Would you agree if we do the transistor isolated version of a Buck, ie, make them Two Transistor forwards, then it would be less noisy, as the leakage
inductance of the 2TF gives a nicer (not so rapid) ramp to the FET current at switch ON.
So two transistor forward is less noisy than Buck?
Eg Boost PFCs are known to be very noisy, as the fet switch on gobbles up a load of reverse recovery through the output diode...there is no leakage inductance to staunch this.
We do not need any isolation....(the vin is already isolated, and will be coming from a bank of supercaps)
EMC is not of any interest to us. But noise that will destroy the PWM controller operation obviously is.
(The load is only supplied for 100ms every half an hour)
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