Vehicle Power Source Device External Power Feed Control
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Solution Overview
Problem
Existing power feed systems for vehicles do not adequately prevent continuous operation of in-vehicle electric apparatuses during external power feeding, potentially leading to inappropriate operation and breakdown, and may exceed output limits, causing external device shutdown.
Innovation Solution
A power source device with a control unit that prioritizes external power feeding over in-vehicle power feeding, stopping AC output and limiting DC output when external power is requested, ensuring safe and efficient power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power feed to external device is allowed during vehicle operation, then power supply versatility is improved, but risk of unmonitored apparatus operation increases
Solution Approach 1:
The control unit continuously monitors the operation state of the in-vehicle apparatus and compares it with the power feed state to external devices. When a mismatch is detected (apparatus ON while external power feed is active), the system generates an alert or automatically adjusts power distribution, ensuring safe operation through continuous feedback monitoring.
Solution Approach 2:
The control unit acts as an intermediary between the power source, in-vehicle apparatus, and external devices. It manages power flow distribution, preventing direct conflicts between internal and external power demands, and coordinates operation states to maintain system reliability while enabling versatile power supply.
2Ease of operation
If service receptacle power is allowed during external power feed, then user convenience is improved, but total output current limit may be exceeded
Solution Approach 1:
The control unit dynamically adjusts power distribution between the service receptacle and external devices based on real-time monitoring of total output current. When the limit is approached or exceeded, the system automatically reduces or redirects power flow, maintaining operational flexibility while preventing overload conditions.
Solution Approach 2:
The system changes power distribution parameters (voltage, current allocation) between different outputs based on operational conditions. By dynamically modifying these parameters, the control unit ensures total current remains within limits while still providing convenient power access to users through the service receptacle when appropriate.
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
Prevents continuous operation of in-vehicle electric apparatuses without user notice, avoiding potential breakdowns and ensuring external devices do not exceed power limits, thus maintaining safe and efficient power supply during external power feeding.
Implementation Method 1
an AC output unit which is arranged to receive the voltage of the DC power source to generate an AC voltage, and to output the AC voltage to the second connection unit
Data Source
Figure 1
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Figure 4
AI summary
A power source device for a vehicle includes: a power source (105); a DC outlet (170) for feeding power from the power source (105) to an external device (500) external to the vehicle; a service receptacle (190) provided, within a vehicle interior, separately from the DC outlet (170); an operating unit (200) by which a user requests power feed from the DC outlet (170) to the external device (500); and a vehicle ECU (300) which controls power supply from the power source to the DC outlet (170) and the service receptacle (190). When the vehicle ECU (300) receives, from the operating unit (200), an input requesting the power feed to the external device (500), the vehicle ECU (300) stops the power supply to the service receptacle (190) and causes the DC outlet (170) to perform the power supply. With the configuration described above, the possibility of failure to turn off an in-vehicle electric apparatus is reduced.