Interleaving-based converter system with features of external auxiliary triggering and universal line input for driving medical laser equipment

Abstract

A novel power converter system to drive medical laser equipment is proposed here, which has the major features of interleaving, external auxiliary triggering, and lighting period control. The converter system can deal with universal line input and provide instantaneous high power for medical laser equipment. This system mainly includes an interleaved-boost front end (IBFE), a lighting-period control unit (LPCU), an energy-stored capacitor bank (ESCB), an igniting and arc-sustaining circuit (IASC), external auxiliary triggering circuit (EATC), and a system controller (SC). With them, it is able to fulfil power factor correction (PFC), lower input current ripple, deal with universal line voltage, provide a larger current to xenon lamp, ignite xenon lamp at a lower voltage, and sustain lamp arc. The sustained arc will be beneficial to light the xenon lamp again. As a result, much more precise timing of laser output control can be accomplished. The operation of the converter system is discussed. In addition, a 2-kW prototype to deal with the line voltage range of 90 to 265 V(ac) is built and examined. Key waveforms and practical measurements have demonstrated the feasibility of the proposed converter system.

Keywords

• power factor correction
• trigger circuits
• capacitors
• power convertors
• biomedical equipment
• lighting control
• lamps
• xenon lamp
• energy-stored capacitor bank
• power converter system
• line voltage range
• laser output control
• universal line voltage
• lower input current ripple
• power factor correction
• system controller
• arc-sustaining circuit
• lighting-period control unit
• interleaved-boost front end
• medical laser equipment
• instantaneous high power
• universal line input
• lighting period control
• external auxiliary triggering