Optical Probing of DC/DC Converter Voltages for Sequencing Verification

Abstract

Abstract The purpose of this project is to develop an application that can verify start-up and shut-down sequencing of DC/DC converters and that can be downloaded on a mobile phone for Ericsson employees to use on their company provided phones. It was concluded that a combination of using JavaScript together with HTML and CSS was the best way to create a program that can measure pixel values of LEDs on probe opto-modules. The probe opto-modules are placed on the circuit board by the user and then recorded during start-up and shut-down. To acquire accurate values from the recorded videos the super slow-motion camera feature, with a frame rate of 960 FPS, on a Samsung S22 mobile phone was used. Due to storage limitations on the phone, the video could only be recorded for about 0,5s with the super slow-motion feature. The result was a functioning application that can be downloaded on both mobile phones as well as computers. The final application page consists of a header with five buttons, a canvas where the recorded video is displayed and a plot window at the bottom of the page to show the sequencing of the voltages. This application could reduce the workload on Ericsson employees, allowing more time for higher priority tasks than voltage measurement and contribute to an overall decreased environmental harm since far less instruments and components are necessary. There are only parts of the program added throughout this report, such as functions and other relevant lines of code to make the text easier to understand. The entire code can be viewed by Ericsson employees only.