A capacitor charger system comprising: - a capacitor charger module ; - an isolated acquisition module for sampling an output voltage level of said capacitor charger module , wherein the isolated acquisition module includes a signal acquisition circuit connected to an analog-to-digital converter, ADC connected to a digital signal processing module ; - a digital control module , connected to said isolated acquisition module via a bi-directional link and connected to said capacitor charger module via a control signal interface, for generating control signal information and synchronization signal information based on data representative of sampled output voltage levels received via said bi-directional link from said isolated acquisition module , and for sending said control signal information to said capacitor charger module via said control signal interface and for sending said synchronization signal information to said isolated acquisition module via said bi-directional link, wherein the bi-directional link is a digital optical link, wherein said capacitor charger module is controlled based on said control signal information from said digital control module ; and wherein said isolated acquisition module is configured for performing said sampling based on said synchronization signal information, wherein the sampling of the ADC is controlled based on said synchronization signal information; wherein the capacitor charger module is a Pulse Width Modulated (PWM) capacitor charger module and the digital control module is configured to generate the control signal information in the form of a PWM control pattern including PWM control pulses, wherein the digital control module is configured to send a pulse via the digital optical link to the ADC of the isolated acquisition module in synchronization with the generation of the PWM control pattern such that the sampling of the output voltage level of the capacitor charger module by the isolated acquisition module is carried out with a controlled delay related to the PWM control pattern; wherein said digital control module includes a digital processing module configured for generating control data based on: said sampled signal levels received from said isolated acquisition module , a predetermined reference signal level, and at least one of mains voltage input to the capacitor charger module after rectification and output current of the capacitor charger module, wherein said digital control module is configured for generating said control signal information based on said control data. - a capacitor charger module ; - an isolated acquisition module for sampling an output voltage level of said capacitor charger module , wherein the isolated acquisition module includes a signal acquisition circuit connected to an analog-to-digital converter, ADC connected to a digital signal processing module ; - a digital control module , connected to said isolated acquisition module via a bi-directional link and connected to said capacitor charger module via a control signal interface, for generating control signal information and synchronization signal information based on data representative of sampled output voltage levels received via said bi-directional link from said isolated acquisition module , and for sending said control signal information to said capacitor charger module via said control signal interface and for sending said synchronization signal information to said isolated acquisition module via said bi-directional link, wherein the bi-directional link is a digital optical link, <EOS>