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Bi-Directional DC EV Fast Chargers

Overview

Plug-in electric vehicles are commercially available today with most vehicles having Level 1 and Level 2 AC charging capability only. AC charging requires on-board chargers within the vehicle to convert AC power to DC power, which the vehicle battery requires.  The use of on-board chargers adds burden to the vehicles in the form of size, weight, cost and heat.  In addition, AC charging at 240 Volts AC has limitations to the amount of power or Kilowatts that can be delivered to the vehicle. This limitation results in lengthy, undesirable charging times to “fill up” the vehicle’s battery. DC fast charging is a method in which the charger is placed off-board and the AC power conversion to DC takes place within the external stationary charger thus reducing burden on the vehicle.

 

The inverters are UL-Approved and meet UL-1741 requirements for utility connected power inverters.  Coritech chargers provide many safety features including over-current protection, ground fault detection and emergency shutdown capability to assure safe and reliable fast charging of electric vehicles.  An easy to use color touchscreen operator interface guides the user through a simple procedure to initiate each charging session.

 

Fast DC Charging

 

Coritech VGI Series chargers provide the fastest power transfer available today for DC charging, limited only by the maximum current capacity of the industry standard SAE J1772-Combo connector.

 

VVO - Volt Variable Optimization

 

Coritech chargers provide the ability to influence the stability of the grid by providing VVO to contribute or absorb reactive power (KVARS) to influence the grid power factor.

 

Bi-Directional

 

Provides DC fast charging and reverse power flow (V2G) capability for grid-tie applications to allow vehicles to act as power sources.

 

DC Charging Level 1 & 2

 

Coritech VGI Series chargers provide up to 19.2 KW (Level 1) charging with SAE J1772 connectors and up to 60 KW (Level 2) charging with SAE J1772-Combo connectors. Maximum charging capacity of 75 KW with use of military and specialty connectors and cabling.

 

V2G Support

 

VGI chargers provide full communications capability for connectivity to utility ISO's. Aggregators and Microgrid Controllers using high speed and secure Ethernet-based protocols.

 

Vehicle Integration

 

Coritech provides integration and engineering services and support to develop hardware and communications integration between the vehicle and charger. Coritech has developed a communications interface that conforms to SAE standards for electric vehicle charging including SAE J1772 and J2847.

 

Aggregator Control

 

Coritech chargers provide the ability for each vehicle's charging activity to be controlled from a remote grid "Aggregator" system that manages overall grid performance, health, and stability. Aggregators also can communicate with local utility ISO's for participation in the energy markets.

 

Technical Specifications

 

Utility Grid Connection: 480 VAC, 3 Phase , 90A Max.

Vehicle Connection: SAE J1772 or J1772-Combo

Aggregator Connection: Ethernet, Modbus TCP/IP, SEP2.0

Dimensions: 36 x 24 x 88 inches

Weight: 990 lbs Approx.

Volt/VAR Optimization: -50 to +50 KVAR

Battery Voltage Range: 200-600 VDC

Battery Charging Power*: 75 KW Max, 60KW SAE

Reverse Power Flow V2G*: 75 KW Max, 60KW SAE

Operator Interface: 7” Color Touchscreen

Environmental:

     Enclosure: Outdoor Rated Type 3R

     Operating Temp: -20 to +120 Degrees Fahrenheit

Humidity: 0-95%

Safety: Over-Current Circuit Breaker, GFCI, DC Isolation, Emergency Shutdown Pushbutton

* Power limits shown for VGI-60 Model.  Power limits are based on individual vehicle battery capabilities.  Digital communications between vehicle and charger assures that power transfer is always within safe operating limits of both charger and vehicle.