Charging Device Integrating DC/DC Converter for EV Energy Stores
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Solution Overview
Problem
Existing electric machine arrangements for motor vehicles require additional installation space and experience switching losses due to the need for a DC/DC converter to balance high-power and high-energy stores, which also increases costs.
Innovation Solution
A charging device with a control circuit that allows current to flow from a high-energy store to a high-power store, eliminating the need for a separate DC/DC converter by integrating a third terminal for energy transfer, thereby reducing installation space and switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC/DC converter is provided between two energy stores to ensure charge balance, then charge balance between high-power and high-energy stores is maintained, but installation space increases and switching losses occur
Solution Approach 1:
The patent merges the DC/DC converter functionality into the charging device by integrating a third terminal that can connect to the first energy store. This allows the charging device to perform both AC charging and DC/DC conversion functions, eliminating the need for a separate DC/DC converter and reducing installation space while maintaining charge balance between energy stores
Solution Approach 2:
The charging device is designed with multi-functionality to serve dual purposes: it can charge from the AC power supply system through the first terminal, and simultaneously function as a DC/DC converter by utilizing the third terminal connection to the first energy store. This universal design eliminates the need for dedicated DC/DC converter hardware
2Reliability
If a DC/DC converter is provided between two energy stores to ensure charge balance, then charge balance is maintained, but switching losses increase
Solution Approach 1:
By combining the DC/DC converter functionality into the existing charging device infrastructure, the patent eliminates the need for separate switching operations in a dedicated DC/DC converter. The integrated approach reduces overall switching losses while maintaining charge balance through the control circuit's ability to manage power flow between energy stores
3Reliability
If a DC/DC converter is provided between two energy stores to ensure charge balance, then charge balance is maintained, but costs increase
Solution Approach 1:
The patent reduces manufacturing costs by merging the DC/DC converter functionality into the existing charging device. This integration eliminates the need to manufacture and install separate DC/DC converter components, reducing overall system cost while maintaining charge balance functionality through the integrated third terminal connection
Data Source
AI summary
A charging device charges energy stores of an electrical machine arrangement for a motor vehicle. The charging device has a primary side with a first connection for connection to a power supply system and a secondary side with a second connection for connection to a second energy store. The charging device has, on the primary side, a third connection for connection to a first energy store and is provided with a control circuit for switching over the load flux such that, via the second connection, energy can be transmitted from the second energy store, via the third connection, to the first energy store.