Dual Active Bridge Converter Controller Phase Shift Control
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Solution Overview
Problem
Existing electric vehicle charging systems face challenges in dynamically controlling dual active bridge converters under varying load and battery conditions, particularly in efficiently managing power conversion without relying on current sensors.
Innovation Solution
A controller module for a DC-DC converter that determines primary and secondary side inter-bridge phase shift values and an effective phase shift value based on input and output voltages, and requested power, to generate control signals for switches, enabling efficient power conversion without current sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional control methods with current sensors are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent removes current sensors from the control system entirely. Instead of measuring current directly, the controller calculates power based only on voltage measurements and phase shift control, extracting the unnecessary current sensing component from the system while maintaining control precision.
Solution Approach 2:
The patent introduces phase shift control as an intermediary mechanism. Rather than directly measuring and controlling current, the system uses phase shift between primary and secondary bridges as a mediator to indirectly control power flow, simplifying the overall control architecture.
2Adaptability or versatility
If dynamic control under varying load conditions is implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback control mechanism where the controller continuously monitors output power and adjusts the phase shift values dynamically. The controller calculates the difference between actual and desired power output, then modifies primary and secondary phase shifts accordingly to maintain optimal performance under varying load conditions.
Solution Approach 2:
The patent employs dynamic phase shift adjustment where the control parameters (phase shifts) are not fixed but continuously adapted based on real-time operating conditions. This allows the system to optimize power transfer efficiency across different load scenarios without requiring complex reconfiguration.
3Productivity
If power output tracking is improved, then productivity is improved, but loss of time in calculation increases
Solution Approach 1:
The patent pre-calculates and stores optimal phase shift values for different power output levels during system design or initialization. During operation, the controller simply looks up these pre-determined values based on the desired power output, avoiding real-time complex calculations and enabling rapid power tracking.
Data Source
AI summary
Various disclosed embodiments include illustrative controller modules, direct current (DC) fast charging devices, and methods. In an illustrative embodiment, a controller module for a DC-DC converter includes a controller and computer-readable media configured to store computer-executable instructions configured to cause the controller to: receive an input voltage, an output voltage, and a requested power value. The computer-executable instructions are configured to cause the controller to: determine primary and secondary side inter-bridge phase shifts responsive to the requested power value, the input voltage, and the output voltage; determine an effective phase shift value responsive to the requested power value, the input voltage, the output voltage, and the primary side inter-bridge phase shift; generate control signals for switches of the DC-DC converter responsive to the primary side inter-bridge phase shift, the secondary side inter-bridge phase shift, and the effective phase shift value; and output the generated control signals.