How to remove high voltage spikes of DC Bus while running a DC-DC converter, could anyone suggest me some optimum value of capacitor need at 300-400V?
The yellow line is the input measured voltage, Green one is output voltage, Red is voltage across the switch and 4rth one is voltage across the transformer.
Use ZVS or ZCS to null and void the spikes of the DC-DC converter. The value of DC capacitor should be designed as per specifications of the converter adding design value of active and passive devices as auxiliary circuit.
Your figure shows quite some oscillations. Are you sure your measurement is 'clean'? Coax cables used, no ground reflection? Do you use an IGBT or MOSFET for the converter? Is the control voltage clean? If your control voltage oscillates this is reflected in the channel inside your switching component. Do you use a driver print? Is it capable of driving the component?
It might help to add some capacitance between gate and emitter to slow down the control signal transient (results in more losses).
Hopefully this helps a bit...
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