Switching power converter with switch control pulse width variability at low power demand levels
First Claim
1. A system comprising:
- a switch mode controller to generate a switch control signal to control conductivity of a switching mode switch included in a switching power converter, wherein the switch mode controller comprises;
a period generator to determine a nominal period of the switch control signal, recognize when the nominal period corresponds with a frequency in at least a portion of an audible frequency band, and to vary the nominal period to generate a broad frequency spectrum of the switch control signal when the nominal period corresponds with a frequency in at least a portion of an audible frequency band.
1 Assignment
0 Petitions
Accused Products
Abstract
A power control system includes a switch mode controller to control the switching mode of a switching power converter. The switch mode controller generates a switch control signal that controls conductivity of a switch of the switching power converter. Controlling conductivity of the switch controls the switch mode of the switching power converter. The switch mode controller includes a period generator to determine a period of the switch control signal and to vary the determined period to generate a broad frequency spectrum of the switch control signal when the determined period corresponds with a frequency in at least a portion of an audible frequency band. Generating a switch control signal with a broad frequency spectrum in the audible frequency band allows the system to utilize switching frequencies in the audible frequency band.
-
Citations
33 Claims
-
1. A system comprising:
a switch mode controller to generate a switch control signal to control conductivity of a switching mode switch included in a switching power converter, wherein the switch mode controller comprises; a period generator to determine a nominal period of the switch control signal, recognize when the nominal period corresponds with a frequency in at least a portion of an audible frequency band, and to vary the nominal period to generate a broad frequency spectrum of the switch control signal when the nominal period corresponds with a frequency in at least a portion of an audible frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 26, 27, 32, 33)
-
10. A method comprising:
-
generating a switch control signal to control conductivity of a switch mode switch included in a switching power converter; determining a nominal period of the switch control signal; recognizing when the nominal period corresponds with a frequency in at least a portion of an audible frequency band, varying the nominal period to generate a broad frequency spectrum of the switch control signal when the nominal period corresponds with a frequency in at least a portion of an audible frequency band; determining a pulse width of the switch control signal; and providing the switch control signal to the switch of the switching power converter. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 28, 29)
-
-
20. A power control system comprising:
- a switching power converter having a switch; and
a switch mode controller to generate a switch control signal to control conductivity of a switching mode switch included in a switching power converter, wherein the switch mode controller comprises;
a period generator to determine a nominal period of the switch control signal, recognize when the nominal period corresponds with a frequency in at least a portion of an audible frequency band, and to vary the nominal period to generate a broad frequency spectrum of the switch control signal when the nominal period corresponds with a frequency in at least a portion of an audible frequency band. - View Dependent Claims (21, 22, 23, 30, 31)
- a switching power converter having a switch; and
-
24. An apparatus comprising:
-
means for generating a switch control signal to control conductivity of a switch mode switch included in a switching power converter; means for determining a nominal period of the switch control signal; means for recognizing when the nominal period corresponds with a frequency in at least a portion of an audible frequency band, means for varying the nominal period to generate a broad frequency spectrum of the switch control signal when the nominal period corresponds with a frequency in at least a portion of an audible frequency band; means for determining a pulse width of the switch control signal; and means for providing the switch control signal to the switch of the switching power converter. - View Dependent Claims (25)
-
Specification