Dual-Converter Power Supply Control for Intermediate Current Efficiency

The patent divides the current output range into three distinct segments: a first current range where only the first converter operates, a second current range where only the second converter operates, and a third intermediate current range where both converters operate simultaneously. This segmentation allows the system to optimize voltage conversion efficiency in each region while providing a specific operational mode for the intermediate boundary region where both converters work together, thereby avoiding the efficiency reduction that would occur if only one converter were used alone in that region.

The patent merges the operation of both the first converter and the second converter in the third current range (intermediate region). By allowing both converters to operate simultaneously and coordinating their output currents, the system achieves improved voltage conversion efficiency in the boundary region where neither converter alone would be efficient, thus combining the strengths of both converters to overcome the limitation of individual operation.

The control device monitors the output current value and uses this feedback to dynamically determine the appropriate operational mode. When the output current falls within the third current range (intermediate region), the control device activates a mode where both converters operate simultaneously, thereby reducing the discharge current from the low-voltage battery and minimizing its deterioration, while still meeting the load power requirements.

The patent changes the operational parameters of the converter system by introducing a third operational mode for the intermediate current range. In this mode, the control device adjusts the output currents of both converters based on the load requirements, thereby optimizing the power distribution to reduce stress on the low-voltage battery while maintaining system efficiency.

The control device is designed with segmented control logic that divides the operational space into three distinct current ranges, each with a predetermined operational mode. This segmentation simplifies the control complexity by providing clear decision boundaries: if the output current is in the first range, use only the first converter; if in the second range, use only the second converter; if in the third intermediate range, use both converters. This structured approach avoids the need for complex real-time optimization algorithms.

The control device dynamically switches between different operational modes based on the real-time output current value. This dynamic control allows the system to adapt to varying load conditions while maintaining simple control logic through predefined current ranges and corresponding operational modes, thereby achieving high overall efficiency without excessive control complexity.