Design of a Digitally Controlled Low-Power Buck-Boost Converter for Efficient Power Management

Every day, new electronic products are designed and tested. Every product is thoroughly tested before it is released into the market. The bench power supply is necessary to power and test the product. A bench power supply is a power converter that can supply DC power to the load. These power supplies usually have a variable output voltage range of 0-32V. The power supply made in this project is a two-switch buck-boost converter with a dual LCD and Bluetooth-based wireless display. The buck boost converter is a kind of DC-DC converter, and it can deliver a voltage that is higher than, or at most equal to, its input voltage. Because of this, it can be operated with a 12V standard battery or a wall plug. The display system serves as a means to observe the DC-DC converter by showing voltage, current, power, and status. The display system has an LCD and Bluetooth-based display, which allows the user to monitor the system at the bench or at a distance, as the workbench with the project being tested may become crowded and inconvenient to sit at and monitor, or the user may want to stand away from the bench for safety. After conducting tests with different KP and KI values, optimal values of the constants were found such that the converter has the best performance and stability. The maximum efficiency was achieved at about 92.44% with an output power of 24.25 W to 27.23 W for an input voltage of 11.95 V.