3.3KW bidirectional on board charger

Product Overview

This automotive-grade bidirectional OBC is a fully digital, air-cooled power electronics unit designed for electric passenger cars, logistics vehicles, and specialty EVs. It integrates high-efficiency AC-to-DC charging with DC-to-AC inverting capabilities, all within a rugged IP67-rated aluminum enclosure.

• Charging Power: 3.3kW.

• Inverting Power: 3kVA (V2L).

• Integrated DC/DC: 2kW Auxiliary Power.

• Thermal Management: Advanced Fan-Cooling.

• Communication: Dual CAN-BUS 2.0B.

Technical Authority & Engineering Excellence 

1. Bidirectional Versatility (V2L Support)

Unlike standard chargers, our unit features a built-in inverter that converts 250-500VDC from the traction battery into 220VAC (±5%) at 50Hz. With a 3kVA output and ≥94% inverting efficiency, it provides reliable power for external appliances, tools, or emergency home backup.

2. Integrated DC/DC Converter

To maximize space and weight efficiency, the unit includes an integrated 2kW DC/DC converter. It steps down high-voltage power to a stable 13.8V (9-16V range) to power the vehicle’s low-voltage systems and charge the auxiliary 12V battery with a massive 145A output.

3. Ruggedized for Extreme Environments

Safety is our core priority. The unit is rated IP67, ensuring it is completely dust-tight and protected against water immersion. It operates flawlessly in extreme temperatures ranging from -40°C to +85°C, making it suitable for any climate.

4. Intelligent Smart Charging

The charger supports CAN-BUS communication for real-time data exchange with the BMS and VCU. It supports scheduled charging, online firmware upgrades, and comprehensive fault diagnosis to ensure peak performance throughout the vehicle’s lifecycle.

Technical Specifications

OBC Electrical Characteristics (Charging)

• Input Voltage Range: 85-265VAC

• Input Current: 16A Max

• Power Factor: ≥0.99 (at 220VAC, full load)

• Output Voltage Range: 190-500VDC

• Max Efficiency: ≥94%

Inverter Characteristics (V2L)

• Output Voltage: 220VAC ±5% / 50Hz

• Rated Power: 3kVA

• Efficiency: ≥94%

• THDv: <5% (Linear load)

DC/DC Converter (Auxiliary Power)

• Input Voltage Range: 190-500VDC

• Output Voltage / Current: 13.8V / 145A

• Rated Power: 2kW

• Efficiency: ≥94%

Safety & Protection Suite

Our bidirectional OBC is designed with a redundant protection architecture:

• Input: Over/Under Voltage Protection

• Output: Over-Voltage, Over-Current, and Short-Circuit Protection

• Thermal: Over-Temperature Shutdown and Automatic Derating

• System: Battery Reverse Polarity Protection and Communication Fault Protection