Electrical Power Supply Arrangement and Use Thereof

• US 20090167260A1
• Filed: 06/21/2006
• Published: 07/02/2009
• Est. Priority Date: 06/28/2005
• Status: Active Grant

• Current Assignee: ams AG (Ams-Osram AG)
• Original Assignee: ams AG (Ams-Osram AG)
• Inventors: Trattler, Peter, Pauritsch, Manfred
• Granted Patent: US 8,716,987 B2
• Time in Patent Office: Days
• US Class Current: 323/233
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H05B 45/375 using buck topology
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A power supply arrangement is specified in which a capacitor with a low internal resistance, in particular a supercap (3), is connected via a means for charging (4) to an input (1) and via a load current regulator (9) to a connecting means (7) for an electrical load (8). Together with a feedback path, a control loop is formed for the load current through the electrical load (8). It is therefore possible to allow flash operation in applications such as mobile telephones with rechargeable batteries with a high internal resistance, with provision for high energy utilization from the capacitor, with controlled discharging with a regulated current.

Claims

1. A power supply arrangement comprising:

an input for connecting a voltage source;

a capacitor having a low internal resistances;

a means for charging the capacitor, which means couples this capacitor to

the input of the power supply arrangements;

means for connecting an electrical load;

a load current regulator, which couples the capacitors to the means for connecting the electrical load; and

a feedback path, which couples a means for load current detection, which is coupled to the means for connecting the electrical load, to the load current regulator.

2. The power supply arrangement as claimed in claim 1, wherein

the internal resistance of the capacitor is less than the internal resistance of the voltage source.

3. The power supply arrangement as claimed in claim 1, wherein,

the means for connecting an electrical load is in the form of a means for connecting a light-emitting diode.

4. The power supply arrangement as claimed in claim 1, wherein

a light-emitting diode is connected to the means for connecting an electrical load.

5. The power supply arrangement as claimed claim 1, wherein

the capacitor has an internal resistance of less than 100 milliohms.

6. The power supply arrangement as claimed in claim 1, wherein

the capacitor has an internal resistance of less than 60 milliohms.

7. The power supply arrangement as claimed in claim 1, wherein

the capacitor is a supercap.

8. The power supply arrangement as claimed in claim 1, wherein

the capacitor has a capacitance in a range from 0.1 to 10 Farad.

9. The power supply arrangement as claimed in claim 1, wherein

the capacitor has a capacitance in a range from one to two Farads.

10. The power supply arrangement as claimed in claim 1, wherein

the means for load current detection comprises a current source.

11. The power supply arrangement as claimed in claim 1, wherein

the means for load current detection comprises a resistor.

12. The power supply arrangement as claimed in claim 1, wherein

the means for charging the capacitor comprises a charge pump, such that the voltage at the output of the charge pump, is greater than the voltage at the input of the charge pump.

13. The power supply arrangement as claimed in claim 1, wherein

the load current regulator comprises a means for load current limiting.

14. The power supply arrangement as claimed in claim 1, wherein

the load current regulator is a DC/DC converter.

15. The power supply arrangement as claimed in claim 1 wherein

the means for charging the capacitor and the load current regulator have a jointly used inductance.

16. The power supply arrangement as claimed in claim 1, wherein

the means for charging the capacitor comprises a Buck converter.

17. The power supply arrangement as claimed in claim 1, wherein

the load current regulator comprises a boost converter.

18. The power supply arrangement as claimed in claim 1, wherein

a bypass path which can be switched on and off is provided and couples the means for charging the capacitor to the means for connecting the electrical load.

19. The power supply arrangement as claimed in claim 1, comprising:

switching means are provided for coupling the capacitor to the input for connecting a voltage source, such that, a parallel circuit of the capacitor with the voltage source is produced in a charging phase of the capacitor, and a series circuit of the capacitor with the voltage source is produced in a discharge phase of the capacitor.

20. The power supply arrangement as claimed in claim 1, comprising:

means are provided for coupling the capacitor to the input for connecting a voltage source, such that a series circuit of the capacitor with the voltage source is produced in a charging phase and in a discharge phase of the capacitor.

21. The power supply arrangement as claimed in claim 1, wherein

the power supply arrangement is designed using integrated circuit technology.

22. A mobile radio comprising an electrical load in the form of a flash light-emitting diode, a voltage source in the form of a rechargeable battery, and a power supply arrangement as claimed in claim 17 for coupling the electrical load to the voltage source.