Apparatus, and associated method, for converting electrical power into form for powering a load device

• US 20060256594A1
• Filed: 05/11/2005
• Published: 11/16/2006
• Est. Priority Date: 05/11/2005
• Status: Active Grant

• Current Assignee: RadioShack Legacy Corporation
• Original Assignee: RadioShack Legacy Corporation
• Inventors: Lam, Man Lung
• Granted Patent: US 7,298,120 B2
• Time in Patent Office: Days
• US Class Current: 363/74
• CPC Class Codes: H02M 7/5383 in a self-oscillating arrangement H02M7/538 takes precedence

Abstract

A power converter, and an associated method, for converting input power into output power. The power converter is capable of converting direct current input power as well as alternating current input power into direct current output power available for use to power an electrical load device, such as a consumer electronic device. The power conversion is performed at improved levels of efficiency, and less input power is dissipated as thermal energy.

Claims

1. A power converter for converting input power of a selected input power characteristic into output power of a selected output characteristic, said power converter comprising:

a switch element having an input side coupled to receive at least a representation of the input power that exhibits the selected input power characteristic, and having an output said, said switch element positionable in a closed position in which the input side and the output side are electrically connected when the representation of the input power exhibits a representation characteristic beyond a threshold; and

a voltage converter positioned in parallel with said switch element and having an input side coupled to receive the at least the representation of the input power that exhibits the selected input power characteristic and having an output side, said voltage converter selectably converting the at least the representation of the input power when selected to be operable.

2. The power converter of claim 1 further comprising a detector adapted to receive at least the representation of the input power that exhibits the selected input power characteristic, said detector for detecting whether the selected input power characteristic is beyond the threshold.

3. The power converter of claim 2 wherein said switch element is coupled to said detector to receive indications of detection made by said detector, values of the indications determinative of positioning of the switch element.

4. The power converter of claim 2 wherein said voltage converter is coupled to said detector to receive indications of detection made by said detector, values of the indications determinative of whether said voltage converter performs conversions of the representation of the input power.

5. The apparatus of claim 2 wherein said detector is coupled to said switch element and to said voltage converter, said detector further for providing a first control signal to said switch element and a second control signal to said voltage converter, the first control signal of a value to cause said switch element to be closed and the second control signal to cause said voltage converter to not perform conversions and, alternately, the first control signal of a value to cause said switch element to be opened and the second control signal to cause said voltage converter to perform conversions.

6. The apparatus of claim 1 wherein the input power of the selected input power characteristic comprises direct current power of a first selected voltage level, and wherein the representation of the input power of which said switch element is coupled to receive comprises the input power of the first selected voltage level.

7. The apparatus of claim 6 wherein the threshold determination of positioning of said switch position comprises a direct-current voltage value and wherein the first selected voltage level is less than the direct-current voltage value, said switch element positioned in the closed position when the first selected voltage level is less than the direct-current voltage value.

8. The apparatus of claim 6 wherein the threshold determinative of positioning of said switch position comprises a direct-current voltage value and wherein the first selected voltage level is greater than the direct-current voltage value, said switch element positioned out of the closed position when the first selected voltage level is greater than the direct-current voltage value.

9. The apparatus of claim 1 wherein the input power of the selected input characteristic comprises alternating current power of a first selected alternating current level and wherein the representation of the input power of which said switch element is coupled to receive comprises a direct-current-converted power of a first-converted direct current level.

10. The apparatus of claim 9 wherein the threshold determinative of positioning of said switch position comprises a direct-current voltage value and wherein the first-converted direct current level is positioned in the closed position when the first-converted direct current level is less than the direct-current voltage value.

11. The apparatus of claim 9 further comprising an alternating current-to-direct current converter coupled to receive the input power formed of the alternating current power, said alternating current-to-direct current converter for converting the alternating current power into the direct-current-converted power of the first-converted direct current level.

12. The apparatus of claim 11 wherein the first-converted direct current level comprises a fixed level when the first selected alternating current is within a selected range of values.

13. The apparatus of claim 1 wherein the output side of said switch element and the output side of said voltage converter are commonly connected.

14. The apparatus of claim 13 wherein the input side of said switch element and the input side of said voltage converter are commonly connected, said switch element shunting the input sides of said switch element and said voltage converter together with the output sides of said switch element and said voltage converter.

15. A method for converting input power of a selected input power of a selected input power characteristic into output characteristic, said method comprising the operations of:

providing at least a representation of the input power that exhibits the selected input power characteristic to a first side of a switch element;

providing at least the representation of the input power that exhibits the selected input power characteristic to a first side of a voltage converter that is connected in parallel with the switch element; and

closing the switch element to shunt the representation of the input power that exhibits the selected input power characteristic across the voltage converter to a second side of the switch element when the representation of the input power exhibits a representation characteristic beyond a selected threshold.

16. The method of claim 15 wherein the input power comprises alternating current power of a first alternating current level, wherein the representation of the input power comprises a direct-current-converted power of a first-converted direct current level, and wherein said method further comprises the operation, prior to said operations of providing, of converting the alternating current to the direct-current-converted power.

17. The method of claim 16 wherein the first-converted direct current level is of a fixed value when the first alternating current level of the alternating current power is within a selected range.

18. The method of claim 17 wherein the selected threshold used during said operation of closing comprises a direct-current voltage value.

19. The method of claim 18 wherein the fixed value of which the first-converted direct current level exhibited by the first-converted direct current level is of a value less in magnitude than the direct-current voltage value.

20. The method of claim 15 wherein the input power comprises a direct current power of a first selected voltage level, wherein the representation of the input power comprises a direct-converted power of a first-converted direct current level.