1. E. Bianda, T. Li, J. Huusari, and, N. Ho, “Full-Bridge Inverter with Unipolar Switching Scheme and its Method of Operation”, US Patent Application, US2021126554 (A1), 29/04/2021.

2. N. Ho, K. Siu, and D. Li, “Direct Current Circuit Breaker and Related Method”, PCT Patent Application, WO2021/163795 (A1), 26/08/2021.

3. N. Ho, D. Li, and K. Siu, “Device for Electrically Interconnecting DC Microgrid with Higher Voltage DC BUS and Related Methods”, PCT Patent Application, WO2021/237337 (A1), 02/012/2021.


1. N. Ho, R. Abdalaal, and H. Chung, “Transformerless Single-Phase Unified Power Quality Conditioner (UPQC) for Large Scale LED Lighting Networks,” US Patent, US10728981 (B2), 28/07/2020.


1. N. Ho, K. Paatero, and N. Notari, “Uninterrupted Power Supply System with Precharge Converter”, US Patent, US10199859 (B2), Feb. 5, 2019.

2. N. Ho and K. Siu, “Bi-directional electric power conversion circuit with bridgeless buck-boost circuit and reconfigurable capacitor-inductor filter circuit ”, US Patent, US10381953 (B2), Aug. 13, 2019.



1. L. Serpa, F. Canales, N. Ho, and A. Coccia, “Non-isolated DC-DC Converter for Solar Power Plant ”, EU Patent, EP2367275 (B1) , Oct. 25, 2017.


1. T. Li, N. Ho, G. Escobar, and J. Bradshaw, “Active Snubber Topology ”, US Patent, US9331563 (B2) , May. 3, 2016.

2. G. Escobar, S. Pettersson, L. Serpa, N. Ho, A. Coccia, A. Oudalov, and A. Timbus, “Method and Apparatus for Detecting Islanding Conditions of a Distributed Grid ”, US Patent, US9331486 (B2) , May. 3, 2016.

3. N. Ho, G. Escobar, and F. Canales, “Method and Apparatus for Producing Three-phase Current ”, US Patent, US9344005 (B2) , May. 17, 2016.


1. G. Escobar, N. Ho and S. Pettersson, “Method and Apparatus for Controlling a Grid Connected Converter ”, US Patent, US8929108 (B2) , Jan. 6, 2015.

2. G. Escobar, N. Ho and S. Pettersson, “Method and Apparatus for Zero Sequence Damping and Voltage Balancing ”, US Patent, US9030854 (B2) , May. 12, 2015.

3. N. Ho and T. Li, “Bridgeless Power Factor Correction Circuit ”, US Patent, US9093917 (B2) , Jul. 28, 2015.