Power Converter Pre-Charging to Block Early High-Voltage Output
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Solution Overview
Problem
Existing battery charging technologies face challenges in ensuring a normal charging process and charging safety, particularly due to the risk of high voltage output from charging piles when the pre-charging of power conversion devices is not completed.
Innovation Solution
A method for pre-charging a power conversion device, which includes receiving a message from a battery management system indicating readiness for charging, performing pre-charging by charging a capacitor in the power conversion device, and forwarding the message to the charging pile after pre-charging is completed. This ensures that the charging pile does not output high voltage until the power conversion device is fully pre-charged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the charging pile outputs high voltage immediately when receiving a charging ready message, then the charging response speed is improved, but the charging safety deteriorates due to risk of large pulsed currents when pre-charging is not completed
Solution Approach 1:
The power conversion device performs pre-charging of its capacitor before accepting high voltage from the charging pile. The control unit monitors the pre-charging status and only allows the charging pile to output high voltage after the capacitor is fully charged, preventing large pulsed currents while maintaining efficient charging.
2Reliability
If the power conversion device waits for pre-charging completion before forwarding the charging ready message, then the charging safety is improved, but the charging response time increases
Solution Approach 1:
The power conversion device performs pre-charging in advance before receiving the charging ready message from the battery management system. This ensures the capacitor is already charged when the message arrives, allowing immediate forwarding of the message to the charging pile without delay, thus maintaining both safety and response time.
3Device complexity
If the capacitor in the power conversion device is not pre-charged, then the device complexity is reduced, but harmful factors increase due to large pulsed currents damaging components
Solution Approach 1:
The power conversion device includes a capacitor that is pre-charged before normal charging operation. The control unit monitors the pre-charging status and controls the charging pile's high voltage output accordingly, preventing large pulsed currents that could damage components while maintaining a relatively simple device structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution ensures a normal charging process and enhances charging safety by preventing high voltage output from the charging pile until the power conversion device is fully pre-charged, thus avoiding large pulsed currents that could damage components.
Implementation Method 1
charging a capacitor in the power conversion device
Data Source
AI summary
Embodiments of the present application provides a method for pre-charging a power conversion device and a power conversion device. The power conversion device is configured to perform power conversion between a charging pile and a traction battery, and the method includes: receiving, by the power conversion device, a first message sent by a battery management system of the traction battery, and the first message is configured to indicate that the battery management system is ready for charging; performing, by the power conversion device, a pre-charging, and the pre-charging includes: charging a capacitor in the power conversion device; and forwarding, by the power conversion device, the first message to the charging pile after the pre-charging is completed. The technical solution of the embodiments of the present application can ensure a normal charging process.