Full-Bridge LLC Converter Control for Wide Output Voltage Regulation

The full bridge converter is segmented into two independent half-bridges, each capable of operating autonomously. The controller divides the output voltage range into two segments: the first half-bridge handles higher voltages while the second half-bridge handles lower voltages. This segmentation allows each half-bridge to be optimized for its specific voltage range, reducing overall circuit complexity while maintaining wide voltage support capability.

The full bridge converter is designed with multi-functionality by enabling it to operate in different modes depending on the required output voltage. The same physical converter structure can function as a full bridge for high voltage output or split into two half-bridges for lower voltage output, eliminating the need for multiple dedicated converter systems and reducing design complexity.

The converter employs dynamic control mode selection based on the desired output voltage. Rather than using a static wide frequency range that is difficult to control, the system dynamically switches between full bridge mode and half-bridge modes, with each mode having an optimized frequency range. This dynamic adaptation simplifies control within each operating range while maintaining wide overall voltage support.

The control parameters (operating mode, frequency range, duty cycle) are changed based on the target output voltage. For higher voltages, the system uses full bridge mode with appropriate frequency and duty cycle parameters. For lower voltages, it transitions to half-bridge mode with different optimized parameters. This parameter adaptation allows easy control within each range while achieving wide overall voltage coverage.

A single full bridge converter system is designed to perform multiple functions by supporting different output voltages through different operating modes. The controller intelligently selects whether to operate as a full bridge or split into half-bridges based on the required voltage, providing accurate voltage support for various battery types without requiring multiple separate charger systems.

The voltage support capability is segmented into different ranges handled by different operating modes. The first half-bridge segment handles higher voltage batteries while the second half-bridge segment handles lower voltage batteries. This segmentation maintains voltage accuracy for each battery type while consolidating multiple functions into a single system.