A three-phase AC power source using multivariable repetitive robust model reference adaptive control. - Carlos M. Richter; Emerson Giovani Carati; Humberto Pinheiro; Hélio Leães Hey; José Renes Pinheiro; Hilton Abílio Gründling (ACC, 2003)

A multivariable robust model reference adaptive controller using a modified least-squares algorithm. - Carlos M. Richter; Humberto Pinheiro; Hélio Leães Hey; José Renes Pinheiro; Hilton Abílio Gründling (ACC, 2003)

A unified design criterion for ZVT DC-DC PWM converters with constant auxiliary Voltage source. - Jumar Luís Russi; Mário Lúcio da Silva Martins; Hilton Abílio Gründling; Humberto Pinheiro; José Renes Pinheiro; Hélio Leães Hey (IEEE Trans. Ind. Electron., 2005)

Synthesis Methodology for Multipole ZVT Converters. - Jumar Luís Russi; Mário Lúcio da Silva Martins; Luciano Schuch; José Renes Pinheiro; Hélio Leães Hey (IEEE Trans. Ind. Electron., 2007)

A Maximum Power Point Tracking System With Parallel Connection for PV Stand-Alone Applications. - Roger Gules; Juliano De Pellegrin Pacheco; Hélio Leães Hey; Johninson Imhoff (IEEE Trans. Ind. Electron., 2008)

Coupled-Filter-Inductor Soft-Switching Techniques: Principles and Topologies. - Jumar Luís Russi; Mário Lúcio da Silva Martins; Hélio Leães Hey (IEEE Trans. Ind. Electron., 2008)

Analysis and Synthesis of Novel Hybrid Integrated Soft-Switching Cells for Power Converter Systems With Two Switching Poles. - Jumar Luís Russi; José Renes Pinheiro; Hélio Leães Hey (IEEE Trans. Ind. Electron., 2008)

AC power source based on series-connection between modular multilevel converter and linear power amplifier. - Guilherme S. da Silva; Rafael Concatto Beltrame; Mário Lúcio da Silva Martins; Luciano Schuch; Hélio Leães Hey; Cassiano Rech (IECON, 2013)

A Simple Approach to Detect ZVT and Determine Its Time of Occurrence for PWM Converters. - Jumar Luís Russi; Vinicius Foletto Montagner; Mário Lúcio da Silva Martins; Hélio Leães Hey (IEEE Trans. Ind. Electron., 2013)

Brazilian grid-connected photovoltaic inverters standards: A comparison with IEC and IEEE. - Henrique Horst Figueira; Hélio Leães Hey; Luciano Schuch; Cassiano Rech; Leandro Michels (ISIE, 2015)

Integrated methodology design to improve the efficiency and reduce volume of the CCM PFC boost converters with pre-sizing settings. - Hamiltom C. Sartori; José Eduardo Baggio; Hélio Leães Hey; José R. Pinheiro; Fernando Beltrame (ISIE, 2015)

Comparative Evaluation of Single Switch High-Voltage Step-Up Topologies Based on Boost and Zeta PWM Cells. - António Manuel Santos Spencer Andrade; Hélio Leães Hey; Luciano Schuch; Mário Lúcio da Silva Martins (IEEE Trans. Ind. Electron., 2018)