Insulated Bidirectional DC Converter for Safe Low-Voltage Step-Down
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Solution Overview
Problem
Conventional power converters for electric vehicles have a size increase risk due to non-insulated buck converters, which can apply high intermediate voltages to low-voltage loads, compromising safety.
Innovation Solution
A power converter with an insulated bidirectional DC conversion unit that selectively performs step-down and step-up operations, reducing overall size and enhancing safety by preventing abnormal voltage rises to low-voltage loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a non-insulated buck converter is used for constant voltage DC/DC conversion, then the device complexity is reduced, but safety deteriorates due to the risk of high intermediate voltage being applied to low-voltage loads
Solution Approach 1:
An insulated buck converter is introduced as an intermediary device between the intermediate voltage line and the low-voltage load unit. This insulated converter provides galvanic isolation through its transformer structure, preventing high voltage from reaching the low-voltage side while still performing the necessary voltage conversion function. The insulation barrier acts as a mediator that maintains electrical separation, thus resolving the safety issue without significantly increasing overall system complexity.
2Reliability
If an insulated buck converter is used to enhance safety, then safety is improved, but the device complexity increases
Solution Approach 1:
The insulated buck converter is designed to perform multiple functions within a single device: it provides galvanic isolation for safety, performs DC/DC voltage conversion, and regulates output voltage to match low-voltage load requirements. By combining these functions into one universal converter rather than using separate isolated and non-isolated converters, the overall system complexity is minimized while maintaining the necessary safety features.
3Adaptability or versatility
If the DC conversion unit performs multiple operations (step-down, step-up, and dual step-down), then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The DC conversion unit is designed with dynamic switching capability that allows it to operate in multiple modes (first step-down operation, step-up operation, and second step-down operation) based on real-time system requirements. The converter's control system dynamically adjusts its operating mode and transformation ratio to match the needs of different voltage conversion scenarios, providing high adaptability without requiring multiple dedicated converters for each function.
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 solution reduces the power converter's size and enhances safety by using an insulated bidirectional DC conversion unit that can perform multiple operations without the need for dedicated circuits, ensuring safe and efficient voltage conversion.
Implementation Method 1
an insulated DC conversion unit (a first DC conversion unit 1) that is configured to bidirectionally convert a first DC voltage (V1) into a second DC voltage (V2) lower than the first DC voltage (V1) and vise versa
Data Source
AI summary
A power converter includes an insulated DC conversion unit that is configured to bidirectionally convert a first DC voltage and a second DC voltage that is lower than the first DC voltage. The DC conversion unit is configured to selectively perform a first operation, a second operation, and a third operation. In the first operation, the first DC voltage is converted into the second DC voltage. In the second operation, the second DC voltage is converted into the first DC voltage. In the third operation, a third DC voltage that is equal to lower than the second DC voltage is converted into a fourth voltage that is lower than the third DC voltage.