DUAL VOLTAGE ELECTRICAL SYSTEM

• US 20070080669A1
• Filed: 10/06/2005
• Published: 04/12/2007
• Est. Priority Date: 10/06/2005
• Status: Active Grant

• Current Assignee: Deere & Company
• Original Assignee: Deere & Company
• Inventors: Kasten, Robert, Poore, Bernard
• Granted Patent: US 7,224,146 B2
• Time in Patent Office: Days
• US Class Current: 322/22
• CPC Class Codes: H02J 7/1492 by means of controlling devices between the generator output and the battery
• CPC Class Codes: H02M 1/0085 Partially controlled bridges
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A dual voltage supply system supplies high and low voltage electrical power to separate high and low voltage loads. The system includes an AC alternator and first and second rectifier circuits, each connected to the alternator and a corresponding high and low voltage load. The first rectifier circuit commutates the alternator voltage to the high voltage load when the alternator voltage is higher than a voltage of the high voltage load. The second rectifier circuit commutates the alternator voltage to the low voltage load when the alternator voltage is higher than a voltage of the low voltage load and less than some maximum voltage which is less than the maximum voltage that can be tolerated by the low voltage load(s). The second rectifier circuit is turned off whenever the first rectifier circuit is turned on.

Claims

1. A dual voltage supply system for supplying high and low voltage electrical power to separate high and low voltage loads, comprising:

an AC generator alternator;

a first rectifier circuit connected between the alternator and the high voltage load, the first rectifier circuit connecting the alternator output to the high voltage load when the alternator voltage is higher than a voltage of the high voltage load;

a second rectifier circuit connected between the alternator and the low voltage load, the second rectifier circuit connecting the generator alternator to the low voltage load when the generator alternator voltage is higher than a voltage of the low voltage load and less than some maximum voltage which is less than the maximum voltage that can be tolerated by the low voltage load(s).

2. The dual voltage supply system of claim 1, wherein:

the second rectifier circuit is turned off whenever the first rectifier circuit is turned on.

3. The dual voltage supply system of claim 1, wherein each of the first and second rectifier circuits comprises:

a plurality of power switches connected between the generator alternator and one of the loads;

a plurality of switch drivers, each driving a corresponding one of the power switches; and

a phase controlled rectifier controller controlling the switch drivers.

4. A dual voltage supply system for supplying high and low voltage electrical power to separate high and low voltage loads, comprising:

an AC generator alternator;

a first rectifier circuit connected to the generator alternator and to the high voltage load, the first rectifier circuit comprising a plurality of first power switches connected between the generator alternator and one of the loads, a plurality of first switch drivers, each driving a corresponding one of the power switches, and a first phase controlled rectifier controller controlling the first switch drivers so that the first rectifier circuit connects the-alternator to the high voltage load when the alternator voltage is higher than the voltage of the high voltage load;

a second rectifier circuit connected between the alternator and the low voltage load(s), the second rectifier circuit comprising a plurality of second power switches connected between the alternator and the low voltage load(s), a plurality of second switch drivers, each driving a corresponding one of the second power switches, and a second phase controlled rectifier controller controlling the second switch drivers so that the second rectifier circuit connects the alternator to the low voltage load(s) when the alternator voltage is higher than the voltage of the low voltage load(s) and less than some maximum voltage which is less than the maximum voltage that can be tolerated by the low voltage load(s).

5. The dual voltage supply system of claim 4, wherein:

the second rectifier circuit is turned off whenever the first rectifier circuit is turned on.