Phase-Shifted Full-Bridge Reverse Current Control Across Wide Input Ranges
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Solution Overview
Problem
Existing methods for controlling current in phase-shifted full-bridge circuits are inadequate for wide-range input current control, which can impact the safety and lifespan of batteries during charging and discharging.
Innovation Solution
A method and apparatus for controlling reverse current in phase-shifted full-bridge circuits by determining error values of the input current, calculating compensation control quantities for the switch drive signal, and adjusting both the period and duty cycle of the switch drive signal to effectively manage the input current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing current control methods are used, then the control implementation is simple, but the control range of input current is limited
Solution Approach 1:
The patent implements dynamic control by making both the period and duty cycle of the switch drive signal adjustable. The period control quantity and duty cycle control quantity are independently optimized based on the compensation control quantity, allowing the system to adapt to a wide range of input currents. This dynamic adjustment mechanism resolves the contradiction by enabling the controller to flexibly change operating parameters rather than being fixed to a single control mode.
Solution Approach 2:
The patent changes the control parameters from fixed duty cycle only to variable period and duty cycle. By introducing period control as an additional adjustable parameter and optimizing both period control quantity and duty cycle control quantity, the system expands its adaptability to different input current ranges while maintaining manageable complexity through systematic parameter optimization.
2Adaptability or versatility
If the period and duty cycle are both adjustable, then the control range of input current is expanded, but the control system complexity increases
Solution Approach 1:
The patent segments the control process into distinct stages: obtaining compensation control quantity, determining period control quantity, determining duty cycle control quantity, and generating switch drive signals. This segmentation allows each parameter to be independently optimized and managed, reducing the overall system complexity despite the expanded control capabilities. The modular approach makes the complex dual-parameter control system more manageable and implementable.
Solution Approach 2:
The system implements dynamic optimization where the period control quantity and duty cycle control quantity are independently determined based on the compensation control quantity. This dynamic segmentation of control functions allows the system to handle wide-range input currents while maintaining manageable complexity through structured, independent parameter optimization rather than monolithic control.
3Reliability
If existing control methods are used, then the system operation is stable, but the battery safety and service life are compromised due to limited current control
Solution Approach 1:
The patent implements feedback control by obtaining a compensation control quantity based on the actual input current and comparing it with the desired current. This feedback mechanism ensures that the battery charging/discharging current is precisely controlled within safe limits while adapting to varying input conditions. The feedback loop maintains battery safety and extends service life by preventing excessive currents, while simultaneously providing the adaptability needed for wide-range input current control.
Solution Approach 2:
The system changes operational parameters dynamically by adjusting both period and duty cycle based on real-time compensation control quantity. This parameter optimization enables the system to adapt to different input current conditions while maintaining safe operating limits for the battery, thereby improving both reliability and adaptability simultaneously.
Data Source
AI summary
A control method includes determining an error value of a reverse input current of a phase-shifted full-bridge circuit based on sampling and reference values of the reverse input current, determining a compensation control quantity of a switch drive signal of the phase-shifted full-bridge circuit based on the error value. The compensation control quantity corresponds to a period or a duty cycle of the switch drive signal. The method further includes determining period and duty cycle control quantities of the switch drive signal based on the compensation control quantity. The period control quantity is within a value range of the period of the switch drive signal, and the duty cycle control quantity is within a value range of the duty cycle of the switch drive signal. The method also includes controlling the switch drive signal based on the period control quantity and the duty cycle control quantity.