Charging Loop Compensation for Voltage and Current Overshoot
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
During electric vehicle charging, the switching between voltage and current loops can lead to overshoot of output voltage or current, posing safety risks due to potential damage to electronic components in the battery power supply.
Innovation Solution
A method and device that determine the open-loop state of loops in a closed-loop control circuit, assign wave-generation control values to open-loop output values, and calculate updated open-loop output values at each beat to prevent overshoot by performing loop compensation calculations, thereby reducing takeover delay and suppressing voltage or current overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching between voltage loop and current loop is implemented during battery charging, then charging flexibility and control capability are improved, but output voltage or current overshoot occurs causing safety risks
Solution Approach 1:
The patent applies preliminary action by determining the open-loop state of the voltage loop or current loop in advance before switching occurs. By checking whether sampled voltage values are all less than a reference voltage value within a preset time, or whether sampled current values are all less than a reference current value, the system proactively identifies when a loop is in open-loop state and prepares appropriate control measures to prevent overshoot before the switching event actually happens.
Solution Approach 2:
The patent implements feedback by continuously sampling voltage values and current values during charging, comparing them against reference values, and using this information to determine the open-loop state. This feedback mechanism allows the system to detect when switching between voltage loop and current loop may cause overshoot conditions, and adjusts control accordingly to maintain output stability while preserving charging flexibility.
2Reliability
If loop compensation calculation is performed during switching, then output voltage or current overshoot is suppressed, but control response time increases
Solution Approach 1:
The patent performs loop compensation calculation in advance by determining the open-loop state before switching occurs. By evaluating whether sampled values remain below reference values within a preset time period, the system prepares compensation measures proactively, reducing the actual response delay during the switching event itself.
Solution Approach 2:
The patent optimizes the compensation process by skipping unnecessary calculation steps when the open-loop state is confirmed. Once the system determines that all sampled voltage values are less than the reference voltage value (or all sampled current values are less than the reference current value) within the preset time, it can proceed directly to the appropriate compensation action without performing redundant checks, thereby reducing control response time while maintaining output stability.
Data Source
AI summary
Described are a method for suppressing overshoot of an output voltage or output current, a charging device, and a medium. The method for suppressing the overshoot of the output voltage or output current includes the following. A loop in an open-loop state in a closed-loop control circuit is determined. A wave-sending control value output by the closed-loop control circuit at a present beat is obtained. The wave-sending control value output at the present beat is assigned to an open-loop output value at the present beat, where the open-loop output value is an output value of the loop in the open-loop state. An open-loop output value of a loop in the open-loop state at a next beat is calculated by using an assigned open-loop output value at the present beat.