Buck-Boost Bidirectional DC-DC Conversion with Pulse Charging and Discharging Implementation

The Buck-Boost bidirectional DC-DC converter serves as a critical component for efficient bidirectional energy flow, particularly suitable for pulse charging and discharging applications. This topology provides both step-up and step-down voltage conversion capabilities, enabling flexible voltage adjustment between input and output terminals. It is especially well-suited for dynamic voltage requirements in battery energy storage systems, electric vehicles, and renewable energy applications.

In pulse charging/discharging implementations, the converter rapidly switches operational modes (charging or discharging) to respond to load demands. During charging, it functions as a buck converter to store energy from a high-voltage source to a low-voltage battery. During discharge, it switches to boost mode to feed battery energy back to the high-voltage bus. High-frequency PWM control combined with current/voltage closed-loop strategies enables precise regulation of pulse amplitude, frequency, and duty cycle. This precision optimization enhances battery lifespan and minimizes thermal losses through algorithmic control of switching patterns.

Key design considerations include proper selection of inductors and power devices, dead-time configuration, and loop stability to handle transient impacts under pulse operating conditions. Implementation typically involves microcontroller-based control algorithms that manage mode transitions and protection mechanisms. Synchronous rectification technology significantly reduces conduction losses and improves bidirectional efficiency. This solution provides compact and efficient dynamic energy management capabilities for energy storage systems, with software-programmable pulse parameters allowing customization for specific application requirements.