DC Link Brake Actuator H-Bridge for Balanced Energy Dissipation

The patent divides the single switching function into four semiconductor switches arranged in an H-bridge configuration. Each semiconductor can independently control current flow through the braking resistor, enabling precise energy management and improving conversion efficiency while maintaining structural clarity through modular segmentation.

The patent introduces dynamic control through pulse-width modulation (PWM) of the four semiconductor switches. By dynamically adjusting the duty cycle and switching sequences, the system optimizes energy conversion efficiency across varying operating conditions, transforming the static switching approach into a dynamically adaptable system.

The patent employs periodic switching of the four semiconductor devices in complementary pairs with 50% duty cycle. This periodic action eliminates the need for minimum switch-on time constraints while maintaining control simplicity, as the balanced switching pattern naturally manages current flow without requiring extended pulse widths.

The patent changes the control parameters by operating all four semiconductors at a fixed 50% duty cycle with phase shifts, rather than using variable duty cycles with minimum time constraints. This parameter transformation enables precise energy conversion control while simplifying the control logic through symmetric operation.

The patent implements feedback control by continuously monitoring the intermediate circuit voltage and using the four semiconductor switches to actively balance energy conversion. The control system adjusts switching patterns based on real-time conditions, preventing unbalanced energy conversion and reducing battery stress while ensuring continuous reliable operation.

The patent introduces the H-bridge circuit with four semiconductors as an intermediary between the intermediate circuit and the braking resistor. This intermediary structure enables precise control of energy dissipation, balancing the energy flow and protecting the battery from excessive stress while maintaining system continuity.

The patent uses asymmetric switching patterns of the four semiconductor devices in the H-bridge configuration. By applying phase shifts and complementary switching to different semiconductor pairs, the system achieves precise energy conversion control while managing the inherent complexity through deliberate asymmetric operation rather than symmetric simplicity.

The four semiconductor switches in the H-bridge configuration serve multiple functions simultaneously: they control current direction, regulate power dissipation, balance intermediate circuit voltage, and protect the battery. This multi-functionality justifies the increased device complexity by consolidating multiple control tasks into a single integrated circuit structure.