Overview
The VEVOR Level 2 Portable EV Charger is a compact and high-power density portable charging solution for electric vehicles (EVs) like e-mopeds and e-rickshaws. Specifically, it features a two-stage power conversion design:
- AC/DC Stage: This uses a buck-boost type Vienna-derived SEPIC (Single Ended Primary Inductance Converter) operating in discontinuous conduction mode for cost and size reduction of passive components. Moreover, it maintains power factor correction and DC link voltage through a simple follower control.
- DC/DC Stage: A half-bridge LLC resonant converter controlled by frequency modulation enables battery charging rate control.
Key Features
- High Power Density: Designed for a maximum 1.5kW power transfer capacity.
- Universal Input: Accepts input voltages from 90VAC to 265VAC at 47Hz to 63Hz frequencies.
- Quasi-Resonant Switching: The AC/DC converter uses quasi-resonant mode switching for high efficiency across the wide input range.
- Compact Size: The converter’s small size and thermal parameters are well within limits, enabling portable use.
Charging Modes
- Bulk Charge Mode: Operates at 36V to 42V with a maximum 2A current for rapid initial charging.
- Float Charge Mode: Maintains the battery at full charge after bulk charging.
- Deep Discharge Protection: Cuts off charging to prevent excessive battery discharge, thus enhancing battery life.
Applications
The VEVOR Level 2 Portable Charger is suitable for charging 36V, 10Ah to 20Ah batteries commonly used in electric cycles and other light EVs. Additionally, its portable design with a universal AC input makes it a convenient charging solution for EV owners on the go.
Overall, the VEVOR Level 2 Portable Charger combines innovative power electronics with a compact, high-density design to enable efficient and flexible charging for light electric vehicles.
Technical Challenges of VEVOR
| Portable EV Charger Power Density | Increasing the power density of portable EV chargers to enable higher charging rates while maintaining a compact and lightweight design. |
| Battery Charging Rate Control | Developing advanced control strategies for efficient and optimised battery charging rate control in portable EV chargers. |
| Wide Input Voltage Range | Designing portable EV chargers with the capability to accept a wide range of input voltages for universal compatibility. |
| Bidirectional Charging Capability | Enabling bidirectional charging capability in portable EV chargers to allow vehicle-to-vehicle (V2V) and vehicle-to-grid (V2G) charging. |
| Modular and Flexible Design | Developing modular and flexible designs for portable EV chargers to accommodate different charging requirements and battery technologies. |
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