I have designed a power supply that has two outputs, one at -3kV (200mA) and one at -6kV (10mA). A new design challenge has arisen that includes the need to pulse both of the outputs from nominal load to 0A anywhere from 100Hz-100kHz with varying duty cycle. At the moment, although the primary side switches have a frequency of 300kHz, the response to the output loading is not fast enough.
I have posted in other forums and some have mentioned that high-speed linear regulators are able to negate the effects of the load transient. However no-one has been able to assist with a possible circuit for me to attempt to implement. I will attach a schematic which shows what I have so far, without any secondary side control.
I have spoken to some engineers who say that pulsing the input of a linear regulator causes the pulse to be reproduced on the output, however I haven't got much experience with linear regulators to understand what this means. I attempted to do something like this in LTSpice, which I have also attached, but the voltage stresses on the components are too severe and I don't know if this is at all on the right track. I will attach that schematic and results also.
Has anyone dealt with pulsed loads with linear regulators before? Has anyone got any advice to effectively regulate the voltage across the load when the output is pulsed in such a way?