Digital Zero-Current Switching Lock-In Controller IC for Optimized Operation of Resonant SCC

Tom Urkin, Guy Sovik, Erez Erzol Masandilov, Mor Mordechai Peretz

Research output: Contribution to journalArticlepeer-review


This article introduces a lock-in integrated controller for resonant switched-capacitor converter (SCC). The controller identifies the resonant period of each subcircuit on-the-fly and locks-in to the correct switching time to fully utilize the charge transfer rate for each flying capacitor. The various modules of the controller are detailed, including the autotuner and sequencer, which accommodate any mismatch, variations or drifts of component values or circuit configuration. The integrated circuit (IC) has been designed and fabricated on a 0.18 μm 5 V process resulting in effective silicon area of 0.64 mm2. Experimental results of the controller IC operating in closed-loop are provided, demonstrating accurate lock-in for two resonators with individual independent resonant characteristics. A full-scale hardware prototype of 650 W 4:1 switched-tank-converter is used to validate the controller's operation, demonstrating excellent lock-in capabilities resulting in high efficiency of up to 98.6%.

Original languageAmerican English
Article number9219146
Pages (from-to)5985-5996
Number of pages12
JournalIEEE Transactions on Power Electronics
Issue number5
StatePublished - 1 May 2021


  • Integrated circuit
  • resonant converter
  • soft switching
  • switched capacitor
  • zero current switching (ZCS)

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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