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Method-and-apparatus-for-reducing-a-ripple-signal-in-an-output-of-a-direct-current-power-supply

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Method and apparatus for reducing a ripple signal in an output of a direct current power supply

Details

Inventors: Gaetano, Mauro Luigi;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Vo; Don N.
Assistant Examiner: Phu; Phuong
Attorney, Agent or Firm: Breeden; R. Louis

A method and apparatus reduces an output ripple signal of a power supply (200) for supplying a DC voltage and current to a load. One of the output ripple signal and an intermediate ripple signal is sensed to produce a control signal at a ripple sensing element (206), and a rectangular pulse carrier signal is generated by a pulse width modulator (302), the signal having a duty cycle modulated with the control signal to produce a pulse width modulated (PWM) signal carrying ripple signal energy. The rectangular pulse carrier signal operates at a frequency substantially higher than the control signal. The PWM signal is coupled into a portion of the power supply through a transformer (202). The transformer is arranged such that the PWM signal is combined with the intermediate ripple signal at an amplitude and relative phase sufficient to substantially reduce the output ripple signal.

DETAILED DESCRIPTION An aspect of the present invention is a method for reducing an output ripple signal of a power supply for supplying a DC voltage and current to a load.
The method comprises the steps of sensing one of the output ripple signal and an intermediate ripple signal to produce a control signal, and generating a rectangular pulse carrier signal having a duty cycle modulated with the control signal to produce a pulse width modulated (PWM) signal carrying ripple signal energy, wherein the rectangular pulse carrier signal operates at a frequency substantially higher than the control signal.
The method further comprises the step of coupling the PWM signal into a portion of the power supply through a transformer.
The transformer is arranged such that the PWM signal is combined with the intermediate ripple signal at an amplitude and relative phase sufficient to substantially reduce the output ripple signal.
Another aspect of the present invention is a power supply for supplying a DC voltage and current to a load and for generating a reduced output ripple signal.
The power supply comprises a ripple sensing element for sensing one of the output ripple signal and an intermediate ripple signal to produce a control signal, and a pulse width modulator coupled to the ripple sensing element for generating a rectangular pulse carrier signal having a duty cycle modulated with the control signal to produce a pulse width modulated (PWM) signal carrying ripple signal energy, wherein the rectangular pulse carrier signal operates at a frequency substantially higher than the control signal.
The power supply further comprises a transformer coupled to the pulse width modulator for coupling the PWM signal into a portion of the power supply.
The transformer is arranged such that the PWM signal is combined with the intermediate ripple signal at an amplitude and relative phase sufficient to substantially reduce the output ripple signal.
Another aspect of the present invention is a radio communication transmitter

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