Charging Drive Circuit Dead Time Control for Soft Switching
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Solution Overview
Problem
Existing charging piles require a long charging duration due to fixed dead time control in power components, leading to insufficient soft switching and reduced charging efficiency for electric automobiles.
Innovation Solution
A method and apparatus for determining dead time of a charging driving circuit in real time by acquiring output current and voltage, and adjusting dead time based on load status to ensure sufficient soft switching, using a micro-control unit and dual-channel isolated gate drivers to control transistor switching circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed time control is adopted to control the dead time of the power component, then the control is simple, but the dead time in some working areas may be shorter than actual soft switching time, which leads to insufficient soft switching and reduces the charging efficiency
Solution Approach 1:
The patent implements dynamic dead time adjustment by detecting the actual soft switching time through voltage and current sampling, then dynamically modifying the dead time parameter based on load status and detected timing characteristics. This transforms the fixed dead time control into a dynamic adaptation mechanism that optimizes charging efficiency across different working conditions.
Solution Approach 2:
The patent employs feedback control by sampling the output voltage and current of the charging circuit, detecting the actual soft switching time, and using this information to adjust the dead time parameter. The micro-control unit continuously monitors the charging process and modifies the dead time based on real-time feedback, ensuring optimal performance while maintaining manageable control complexity through automated closed-loop control.
2Duration of action of moving object
If the dead time is controlled with fixed time control, then the control method is simple, but the charging duration becomes long due to insufficient soft switching
Solution Approach 1:
The system dynamically adjusts dead time based on actual soft switching time detection, allowing the charging duration to be optimized for each working condition. By adapting the dead time to match the actual switching characteristics, the system achieves sufficient soft switching across all load conditions, thereby reducing overall charging duration while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent changes the dead time parameter dynamically based on detected soft switching time and load status. By modifying this critical timing parameter in response to actual circuit conditions, the system achieves adequate soft switching performance across different operating points, reducing charging duration without requiring complex manual control adjustments.
3Productivity
If dead time is not adjusted according to load status, then the control is simple, but the soft switching is insufficient and charging efficiency is reduced
Solution Approach 1:
The system implements dynamic adaptation to load status by detecting the actual soft switching time under different load conditions and adjusting the dead time parameter accordingly. This dynamic approach ensures sufficient soft switching whether the circuit is lightly or heavily loaded, thereby maintaining high charging efficiency across the full range of operating conditions.
Solution Approach 2:
The patent uses feedback control to monitor the actual soft switching time under varying load conditions and automatically adjusts the dead time parameter to maintain optimal performance. The micro-control unit receives feedback from voltage and current samples and modifies the dead time setting to ensure adequate soft switching regardless of load status, achieving both high efficiency and load adaptability.
Data Source
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AI summary
Disclosed by the present disclosure are a dead time determination method, a charging driving circuit and apparatus, and a device and a medium. The dead time determination method includes: acquiring output current of a charging driving circuit; determining a load status of the charging driving circuit according to the output current of the charging driving circuit; acquiring an output voltage of the charging driving circuit; and determining dead time of the charging driving circuit according to the output voltage and the load status of the charging driving circuit. According to the present disclosure, the dead time of the charging driving circuit in different load statuses can be determined according to the output current and output voltage of the charging driving circuit, so that enables the charging apparatus to output stable voltage or current.