BMS Wake-Up Circuit for Shared AC/DC Charging Interface
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Solution Overview
Problem
Existing battery management systems (BMS) require two interfaces for DC and AC charging wake-up, leading to increased demand for BMS interfaces and higher costs due to the need for additional chips.
Innovation Solution
A charging system that includes an on-board charger, a wake-up auxiliary circuit with diodes, and a BMS, where the diodes transmit AC and DC charging wake-up signals through a single port of the BMS, reducing the number of interfaces needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate interfaces are used for DC and AC charging wake-up, then charging wake-up functionality is achieved, but the number of BMS interfaces increases and costs increase
Solution Approach 1:
The patent combines DC charging wake-up signal and AC charging wake-up signal into a single BMS interface. The wake-up auxiliary circuit uses diodes to multiplex the signal transmission, allowing both charging modes to share one interface while maintaining independent signal paths. This reduces the number of BMS interfaces from two to one, lowering device complexity and cost while preserving wake-up functionality for both charging modes.
Solution Approach 2:
The single BMS interface is designed to handle multiple functions: it can receive both DC charging wake-up signals and AC charging wake-up signals through the wake-up auxiliary circuit. The interface becomes universal, serving both charging modes without requiring separate dedicated interfaces, thereby reducing the overall number of interfaces needed in the BMS.
2Reliability
If two separate interfaces are used for DC and AC charging wake-up, then charging wake-up functionality is achieved, but more chips are required and costs increase
Solution Approach 1:
The patent merges the functionality of two separate interface handling chips into a single chip by implementing a wake-up auxiliary circuit that multiplexes signal paths. The auxiliary circuit with diodes allows one chip to process both DC and AC charging wake-up signals, reducing the total number of chips required and thereby lowering material costs.
3Device complexity
If a single interface is used for both DC and AC charging wake-up, then the number of BMS interfaces is reduced, but signal independence between charging modes may be compromised
Solution Approach 1:
The wake-up auxiliary circuit acts as an intermediary between the charging piles and the BMS interface. It uses diodes to create separate signal paths for DC and AC charging wake-up signals, ensuring that each signal type is transmitted independently through the shared interface. This intermediary structure maintains signal independence and prevents interference between different charging modes while allowing both to share the same BMS interface.
Solution Approach 2:
The patent segments the signal transmission paths within the wake-up auxiliary circuit using diodes. Each diode creates a dedicated pathway for its corresponding charging mode (DC or AC), physically separating the signal flows even though they share a common interface. This segmentation ensures that DC and AC wake-up signals remain independent and do not interfere with each other, maintaining reliability while reducing interface count.
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
This solution reduces the number of BMS interfaces required for charging wake-up, lowering costs and maintaining independence between DC and AC charging wake-up signals for improved safety.
Implementation Method 1
the first diode is configured to transmit an alternating current (AC) charging wake-up signal emitted by an AC charging pile
Implementation Method 2
the second diode is configured to transmit a DC charging wake-up signal emitted by a DC charging pile
Data Source
AI summary
A charging system including an on-board charger (OBC), a wake-up auxiliary circuit, and a battery management system (BMS). The on-board charger is provided with a charging input port and a charging output port. The wake-up auxiliary circuit includes a first diode having a positive electrode electrically connected to the charging output port, and a second diode having a positive electrode electrically connected to a direct current (DC) charging vehicle interface, negative electrodes of the first and second diodes are electrically connected to a same port of the BMS. The first diode is configured to transmit an alternating current (AC) charging wake-up signal emitted by an AC charging pile, which signal is configured to awaken the BMS upon AC charging. The second diode is configured to transmit a DC charging wake-up signal emitted by a DC charging pile, which signal is configured to awaken the BMS upon DC charging.