EV Power Supply Using AC Charge Terminals for External Charger Control
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Solution Overview
Problem
Current charging connector standards do not regulate terminals for supplying control power to external chargers, limiting the use of high-capacity chargers and requiring on-board chargers to be functional for high-power charging, and broken OBCs prevent slow charging.
Innovation Solution
A power supply device with a low voltage supply module, switching modules, and a control module that uses AC input terminals for slow charging to provide control power and high voltage to external devices, regardless of the presence or functionality of on-board chargers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current charging connector standards (CCS1 and CCS2) are used without additional terminals, then the device complexity is reduced and ease of manufacture is improved, but the ability to supply control power to external chargers is lost and high-capacity charger usage is limited
Solution Approach 1:
The patent reuses existing AC input terminals (L1, L2, L3, N, PE) from the charging connector for dual purposes: their original function for AC power input during slow charging, and an additional function for supplying control power to external chargers. This eliminates the need for separate control power terminals while enabling V2X functionality.
Solution Approach 2:
The vehicle's own AC input terminals and power supply system are made to serve the external charger's control power needs. The vehicle acts as a power source for the external charger's control circuitry, using resources already present in the vehicle's charging system without requiring external additions.
2Reliability
If a low capacity OBC (e.g., 7 kW) is installed, then the device complexity and cost are reduced, but the ability to use high capacity external chargers (e.g., 22 kW) is lost and slow charging capability is compromised when OBC breaks down
Solution Approach 1:
The control power supply pathway acts as an intermediary channel that enables communication and control between the vehicle and external charger. Through this control power connection, the vehicle can manage and utilize high-capacity external chargers even when its own OBC has limited capacity or fails, by allowing the external charger to perform charging functions directly.
3Ease of operation
If the on-board charger breaks down, then the ease of repair is improved by isolating the fault, but the slow charging functionality is lost and high-power charging cannot be performed
Solution Approach 1:
The system prepares for OBC failure by establishing control power supply capability to external chargers in advance. When OBC breakdown occurs, the vehicle can immediately switch to using external chargers for both control power and charging functions, preventing service interruption. The control power terminal configuration serves as a backup pathway that cushions against OBC failure.
Data Source
AI summary
An embodiment power supply device of an eco-friendly vehicle includes a low voltage supply module, an inlet including a plurality of terminals for fast charging and slow charging, wherein, among the plurality of terminals, a terminal connected to the low voltage supply module is an alternating current (AC) input terminal for slow charging, a first switching module disposed between a first terminal of the plurality of terminals and the low voltage supply module, and a control module configured to turn on the first switching module to supply a control voltage from the low voltage supply module to an external device in a state in which a connector of the external device is connected to the inlet.