DC/DC Converter Dual Output for Vehicle Battery Management
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Solution Overview
Problem
Current DC/DC converters in motor vehicles inefficiently manage current consumption, leading to rapid discharge of the main battery when accessory equipment with high current demands is powered, compromising vehicle starting capabilities.
Innovation Solution
A DC/DC converter with a switching device and dual electrical outputs, allowing direct connection of the main battery to accessory equipment without voltage conversion for high-demand devices and using the auxiliary battery only when the engine is stopped, optimizing current distribution and reducing parasitic currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the main battery is directly connected to accessory equipment with high current demands through voltage conversion, then the accessory equipment can be powered, but the main battery drains rapidly compromising vehicle starting capabilities
Solution Approach 1:
The patent segments the power distribution system into multiple independent circuits: a first circuit for high-current accessories connected directly to the main battery, and a second circuit for auxiliary battery charging connected through the DC/DC converter. This segmentation allows high-power devices to operate without draining the auxiliary battery, while the main battery maintains sufficient charge for vehicle starting.
Solution Approach 2:
The DC/DC converter acts as an intermediary device that manages power flow between the main battery, auxiliary battery, and accessory equipment. It provides controlled charging to the auxiliary battery while allowing direct power delivery to high-current accessories, thereby mediating the power distribution to prevent main battery drain while ensuring reliable vehicle starting capability.
2Device complexity
If voltage conversion is used for all accessory equipment, then power distribution is simplified, but current consumption becomes inefficient and parasitic currents increase
Solution Approach 1:
The patent applies local quality by providing different power distribution paths for different types of loads. High-current accessories receive direct battery power without conversion, while the auxiliary battery receives controlled charging through the DC/DC converter. This localized optimization eliminates unnecessary voltage conversion for high-power devices, reducing parasitic currents and energy losses.
3Reliability
If the auxiliary battery is used to power high-demand accessories, then the main battery is preserved, but the auxiliary battery discharges rapidly reducing vehicle autonomy
Solution Approach 1:
The system dynamically manages power distribution based on real-time conditions. The DC/DC converter continuously monitors battery states and adjusts charging currents accordingly, while the first switch enables direct power delivery to high-current accessories when needed. This dynamic control ensures the auxiliary battery is recharged efficiently during engine operation, extending vehicle autonomy without compromising main battery charge levels.
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 ensures continuous power supply to accessory equipment while preventing main battery drain, allowing for faster auxiliary battery charging and improved vehicle autonomy by managing current consumption effectively.
Implementation Method 1
a voltage conversion device (150), configured to convert voltage from said main battery (20)
Data Source
Figure 1~3
AI summary
The invention relates to a DC/DC voltage converter (100) for a motor vehicle (10), comprising: - A housing (110), - A voltage conversion device (150), - an input configured to be connected to the main battery (20) of the vehicle (10), and allowing the voltage conversion device (150) to be supplied with current when the engine of the vehicle (10) is running, - an input configured to be connected to a mains supply when the engine of the vehicle (10) is off, optionally via an AC/DC converter (100). It is essentially characterized in that it comprises: - a first electrical output, configured to be electrically connected to the auxiliary battery (30) of the vehicle (10), and - a second electrical output, separate from the first electrical output, and configured to be electrically connected to an accessory electrical equipment of the vehicle (10).