Industrial truck with a charger

• US 7,876,072 B2
• Filed: 02/28/2007
• Issued: 01/25/2011
• Est. Priority Date: 03/01/2006
• Status: Expired due to Fees

• Current Assignee: Jungheinrich AG
• Original Assignee: Jungheinrich AG
• Inventors: Weber, Christoph, Manken, Frank
• Primary Examiner(s): Tso; Edward
• Assistant Examiner(s): Muralidar; Richard V
• Application Number:
  US11/680,300
• Publication Number:
  US 20090080228A1
• Time in Patent Office: 1,427 Days
• Field of Search: 320/104, 320/123, 320/137, 307/10.7, 363/34, 363/17, 363/98, 363/132
• US Class Current: 320/137
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 53/20 characterised by converters located in the vehicle
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer
• CPC Class Codes: H02M 7/797 using semiconductor devices only
• 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 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

Industrial truck with a charger, an asynchronous machine and a three-phase AC control unit which converts a DC voltage of a battery for the asynchronous machine, the charger having a switching power supply which is connected to the three-phase AC control unit via a transformer, the switching power supply, the three-phase AC control unit and the transformer forming a resonant converter, which converts a mains voltage into a charging voltage for the battery.

Claims

1. Industrial truck with a charger (10), an asynchronous machine (34) and an existing three-phase AC control unit (12) which converts a DC voltage of a battery (36) for the asynchronous machine (34), characterised in that the charger has a switching power supply (10) which is connected to the existing three-phase AC control unit (12) via a transformer (14), the switching power supply (10), the existing three-phase AC control unit (12) and the transformer (14) forming an integrated resonant converter, which converts a mains voltage into a charging voltage for the battery.

2. Industrial truck according to claim 1, characterised in that the resonant converter is configured as a series resonant converter.

3. Charger according to claim 1, characterised in that the resonant converter has a capacitor on the secondary side.

4. Charger according to claim 2, characterised in that the capacitor (16) is switched in series with the transformer.

5. Industrial truck according to one of claim 1, characterised in that the resonant converter has an inductor (17) on the primary side.

6. Industrial truck according to one of claim 1, characterised in that the resonant circuit is arranged on the secondary side.

7. Industrial truck according to one of claim 1, characterised in that the resonant converter switches at a zero crossing of the current.

8. Industrial truck according to one of claim 1, characterised in that the resonant converter switches at a zero crossing of the voltage.