Method and apparatus for operating a switchmode power supply
AssigneeMotorola Mobility LLC
InventorDaniel H. Wagner
Life of this patent
Estimating the term…
Abstract
A method and apparatus operate a switchmode power supply. The apparatus can include a pulse width modulation controller that can produce a first pulse width modulation signal at a first frequency. The apparatus can include a switchmode power supply switching element including a control terminal. The apparatus can include a harmonic filter coupled between the pulse width modulation controller and the control terminal of the switching element. The harmonic filter can provide a second pulse width modulation signal at a second frequency to the control terminal of the switching element. The second frequency can be higher than the first frequency.
Claims20
An apparatus comprising:
- a pulse width modulation controller configured to produce a first pulse width modulation signal at a first frequency;
- a switchmode power supply switching element including a control terminal;
- and
- a harmonic filter coupled between the pulse width modulation controller and the control terminal of the switching element, the harmonic filter configured to provide a second pulse width modulation signal at a second frequency to the control terminal of the switching element, where the second frequency is higher than the first frequency.
A method comprising:
- producing a first pulse width modulation signal at a first frequency from a pulse width modulation controller;
- and
- operating a switching element of a switchmode power supply at a second frequency that is multiple of the first frequency of the first pulse width modulation signal.
A switchmode power supply comprising:
- a pulse width modulation controller configured to produce a first pulse width modulation signal at a first frequency;
- a switchmode power supply switching element including a control terminal;
- an energy storage element coupled to the switchmode power supply switching element;
- a harmonic filter coupled between the pulse width modulation controller and the control terminal of the switching element, where the pulse width modulation controller provides the first pulse width modulation signal at the first frequency to the harmonic filter, and where the harmonic filter is configured to generate the second pulse width modulation signal at the second frequency from the first pulse width modulation signal, where the second frequency is a harmonic of the first frequency of the first pulse width modulation signal, where the switchmode power supply switching element operates at the second frequency based on the second pulse width modulation signal to provide energy to the energy storage element.
Dependencies are inferred from the claim text.