Smart EV Charging System Using ZigBee for Grid Load Management
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Solution Overview
Problem
Current Electric Vehicle Supply Equipment (EVSE) lacks grid connectivity, leading to inefficient load management and high costs due to reliance on expensive communication protocols and hardware, hindering the mass adoption of electric vehicles.
Innovation Solution
A smart charging system that includes a measurement unit, communication unit, and control unit connected between the utility grid and electric vehicle, utilizing ZigBee wireless technology and a streamlined architecture to minimize costs, optimize communication, and integrate multiple functions into a single microprocessor, while enabling adaptive charging based on grid conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive communication protocols (CDMA, cellular) are used for grid connectivity, then reliable communication is achieved, but system cost increases significantly
Solution Approach 1:
The patent employs ZigBee wireless communication technology, which is significantly cheaper than CDMA or cellular protocols. The system uses low-cost ZigBee modules instead of expensive cellular modems, reducing communication hardware costs while maintaining sufficient reliability for EV charging applications. This aligns with the principle of using cheaper alternative technologies when full reliability of expensive systems is not absolutely necessary.
Solution Approach 2:
The patent replaces complex wired communication infrastructure with wireless ZigBee communication. Instead of requiring physical connection to communication infrastructure, the system uses wireless electromagnetic communication, simplifying installation and reducing hardware costs while maintaining communication functionality.
2Adaptability or versatility
If multiple communication protocol variants (CDMA, Wi-Fi, etc.) are integrated, then communication versatility is improved, but hardware cost and complexity increase
Solution Approach 1:
The patent implements a universal communication approach by selecting ZigBee as the primary protocol for both grid communication and local networking. This single protocol serves multiple functions including vehicle-to-grid communication, charger-to-charger communication, and integration with smart grid infrastructure, eliminating the need for multiple protocol stacks and reducing hardware complexity.
Solution Approach 2:
Instead of supporting multiple protocols simultaneously (adding complexity), the patent inverts the approach by selecting one cost-effective protocol (ZigBee) that can fulfill all communication requirements. This inversion strategy reduces hardware cost while maintaining adequate versatility for EV charging applications.
3Ease of operation
If charging occurs during peak hours, then consumer convenience is improved, but grid load and electricity cost increase
Solution Approach 1:
The patent implements smart charging with real-time feedback from the utility grid. The EVSE receives pricing signals and load condition information from the grid operator, then automatically adjusts charging rates and timing. When electricity prices are high or grid load is heavy, the system reduces or delays charging, providing feedback-based load management that reduces peak demand and electricity costs.
Solution Approach 2:
The system enables preliminary charging actions by allowing users to schedule charging in advance during off-peak hours when electricity prices are lower. The EVSE can pre-charge vehicles overnight or during low-demand periods, then complete charging during peak hours at reduced rates, optimizing both cost and convenience.
4Loss of time
If DC fast-charging is implemented, then charge time is reduced, but system complexity and cost increase
Solution Approach 1:
The patent implements a hybrid charging strategy that combines AC and DC charging capabilities. The system provides standard AC charging for routine top-ups and optional DC fast-charging for long-distance travel needs. This partial implementation of DC fast-charging reduces charging time for critical scenarios without requiring full DC fast-charging infrastructure, thereby controlling system complexity and cost.
Data Source
AI summary
A smart charging system for mobile vehicles includes a charging apparatus, a meter, and a cloud server. The charging apparatus is connected between an electric grid and an electric vehicle. The charging apparatus is supplied by the electric grid and then provides power to supply the electric vehicle. The meter is operatively connected between the electric grid and the charging apparatus. The meter has a communication with the electric grid to obtain supplied power from the electric grid to the charging apparatus. The cloud server is operatively connected to the electric grid and further operatively connected to the charging apparatus via a gateway apparatus to receive power-supplying information of the electric grid and power-charging information of the electric vehicle. Further, the charging apparatus smartly charges the electric vehicle according to the power-supplying information and the power-charging information.