Engineering Commons^™

Flexible Micro-N-Line Probe And Apparatus To Characterize Electronic Conductivity Of Li-Ion Battery Electrode Films, Derek Van Clement

Theses and Dissertations

A key metric that affects Li-ion battery cell performance is the electronic conductivity of the electrode films. Previous research has found that the conductivity of electrodes is not homogeneous throughout the entirety of the deposited film area. To further characterize the non-homogeneity of the conductivity of electrode films, a micro-N-line probe and a micro-flex-line probe were developed to take micro-scale conductivity measurements of thin-film battery electrodes in a non-destructive manner. These devices have been validated by comparing test results to those of it's predecessor, the micro-four-line probe, on various commercial-quality Li-ion battery electrodes. Results show that there is significant variation …

Dc Line-Interactive Uninterruptible Power Supply (Ups) With Load Leveling For Constant Power And Pulse Loads, Seyed Ahmad Hamidi

Theses and Dissertations

Uninterruptable Power Supply (UPS) systems are usually considered as a backup power for electrical systems, providing emergency power when the main power source fails. UPS systems ensure an uninterruptible, reliable and high quality electrical power for systems with critical loads in which a continuous and reliable power supply is a vital requirement.

A novel UPS system topology, DC line-interactive UPS, has been introduced. The new proposed UPS system is based on the DC concept where the power flow in the system has DC characteristic. The new DC UPS system has several advantageous with respect to the on-line 3-phase UPS which …