Digital controller for constant current/constant voltage power supplies.

We are using Analog card for controlling constant current or constant voltage of a power source using current or voltage feedback . This is an IGBT based PWM controlled power source . Switching frequency is in the range of 20Khz to 100 Khz. We want to have a digital control in place of analog control which uses IC and hundreds of other components. The controller has to deliver current or voltage as set with all protections against over current, over voltage, short circuit etc.