Design and implementation of a high-voltage power supply for industrial In-mold labeling applications

This paper designs and implements a high-voltage DC power supply with wide-range output voltage up to 30kV. There are two stages for the power conversion. The pre-stage circuit is a transition-mode (TM) power factor correction (PFC) converter for improving input power factor and providing a regulated 380V DC output. The post-stage is a DC/DC converter, to use a buck-type current-fed push-pull as its configuration; the secondary is a multiple-voltage circuit, for producing 5-30kV high voltage output. A control interface is also designed to communicate with remote control unit via controller area network (CAN) bus communication protocols. Operating principles and design considerations of the studied high-voltage power supply are discussed and analyzed. Finally, a 150W laboratory prototype was implemented and tested to verify the feasibility of the proposed scheme.