Digital Linear Slope Control for Boost Converter to Improve Load Transient

Abstract

Digital linear slope control (DLSC) method is proposed to attenuate the undershoot and overshoot of the output voltage of a boost converter during the load transient without sensing current. The proposed DLSC method adjusts the slope of the control signal to improve the load transient response. DLSC requires the information of output voltage only and is realized by adding only a few lines of extra program code to the conventional VMC. A mathematical analysis is performed to demonstrate the viability of the DLSC method, and the corresponding algorithms are introduced. A 10 V-15 V, 100-W boost converter operating at 100-kHz switching frequency was built and experimented to validate the effectiveness of the DLSC technique.

Keywords

• Digital control
• boost converter
• load transient
• voltage deviation
• linear slope control
• transient response