Electric vehicle supply equipment with temperature controlled current

• US 10,333,318 B2
• Filed: 04/30/2018
• Issued: 06/25/2019
• Est. Priority Date: 04/09/2010
• Status: Active Grant

• Current Assignee: Webasto Charging Systems, Inc. (Webasto Beteiligungs Verwaltung Gbr)
• Original Assignee: Webasto Charging Systems, Inc. (Webasto Beteiligungs Verwaltung Gbr)
• Inventors: Flack, Albert Joseph
• Primary Examiner(s): Cavallari, Daniel J
• Application Number:
  US15/967,584
• Publication Number:
  US 20180244166A1
• Time in Patent Office: 421 Days
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 2250/10 by alarm
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 53/16 Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/18 Cables specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/305 Communication interfaces
• CPC Class Codes: B60L 53/62 in response to charging parameters, e.g. current, voltage or electrical charge
• CPC Class Codes: B60L 53/66 Data transfer between charging stations and vehicles
• CPC Class Codes: B60L 53/68 Off-site monitoring or control, e.g. remote control
• CPC Class Codes: B60L 58/25 by controlling the electric load
• CPC Class Codes: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H02J 7/0045 concerning the insertion or the connection of the batteries
• CPC Class Codes: H05K 7/00 Constructional details common to different types of electric apparatus casings, cabinets, drawers H05K5/00
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 30/12 Remote or cooperative charging

Abstract

In electric vehicle supply equipment (EVSE), interruption of charging due to overheating is prevented by adjusting the pulse duty cycle on the control pilot conductor communicating the maximum allowed current level to the electric vehicle, the adjustment being performed whenever the EVSE temperature exceeds a predetermined threshold temperature below the maximum operating temperature as a function of the approach of the temperature to the maximum operating temperature.

Claims

1. A method for an electric vehicle supply equipment (EVSE) system for charging an electric vehicle, the method comprising:

a) sensing an present temperature; and

b) controlling a pulse generator coupled to a control pilot conductor by reducing a pulse duty cycle of the pulse generator from a nominal pulse duty cycle by a reduction factor that is a function of an increase of the sensed present temperature above a predetermined threshold temperature.

2. The method of claim 1, wherein the function is a proportional function.

3. The method of claim 1, wherein the reduction factor is a function of the closeness of the sensed present temperature to a maximum operating temperature.

4. The method of claim 1, wherein the predetermined threshold temperature is in a range of 10% to 30% of a maximum operating temperature.

5. The method of claim 1, wherein the electric vehicle responds to a change in pulse duty cycle by changing current draw accordingly.

6. A method for an electric vehicle supply equipment (EVSE) system for charging an electric vehicle, the method comprising:

a) sensing an present temperature; and

b) controlling a pulse generator coupled to a control pilot conductor by reducing a pulse duty cycle of the pulse generator by a reduction factor that is a function of a closeness of the sensed present temperature to a maximum operating temperature, whenever the sensed present temperature exceeds a predetermined threshold temperature.

7. The method of claim 6, wherein the function is a proportional function.

8. The method of claim 6, wherein the predetermined threshold temperature is in a range of 10% to 30% of said maximum operating temperature.

9. The method of claim 6, wherein the electric vehicle responds to a change in pulse duty cycle by changing current draw accordingly.