Rapid Capacitor Charger with Digital Current Mode Control and Industrial Control Interface

We are reporting on a capacitor charger with a rated peak voltage of 50kV. The charger is fed from a standard 208V, 3-phase AC utility outlet. The HV package, consisting of a high frequency transformer, HV rectifier and HV feedback voltage divider was provided by Stangenes Industries and is contained in a 19 inch, 5U rack mountable package. The primary of the transformer is driven by an H-bridge inverter. Inverter current control is achieved through a Digital Signal Controller (DSC) with a fast PWM controller and a programmable analog comparator. The DSC provides cycle-by-cycle peak current mode control as well as current loop stabilization through digital slope compensation. The charger is controlled by an Industrial controller with a touch screen interface. The touch screen interface involves multiple programmable and customizable screens. The controller monitors the output voltage of the load capacitor and closes the voltage loop. A back-up safety function limits the charge time should the voltage loop be broken or not work properly.