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US 2008/0260018 A1Published application
Suppression of high-frequency perturbations in pulse-width modulation
AssigneeHarman Becker Automotive Systems GmbH
InventorsGerhard Pfaffinger, Arnold Knott
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Abstract
A method suppresses high-frequency perturbations in a pulse-width modulated signal. The pulse-width modulation may superpose a carrier signal onto an input signal having a predetermined modulation frequency. The carrier signals may be phase-shifted. The resulting modulated signals may then be filtered and combined.
Claims20
A method of suppressing high-frequency perturbations in a pulse-width modulation comprising:
- pulse-width modulating a first electronic signal by superposing a first carrier signal having a carrier frequency and an input signal with a first modulation frequency to obtain a first pulse-width modulated signal;
- pulse-width modulating a second electronic signal by superposing a second carrier signal having the carrier frequency with another input signal with a second modulation frequency, where the second carrier signal is phase shifted with respect to the first carrier signal to obtain a second pulse-width modulated signal;
- filtering the first pulse-width modulated signal to obtain a first perturbed filtered signal and filtering the second pulse-width modulated signal to obtain a second perturbed filtered signal;
- and
- combining the first perturbed filtered signal and the second perturbed filtered signal to obtain an enhanced output wanted signal.
2 more elements
Pulse-width modulation circuitry comprising:
- a clock generation means configured to generate a first carrier signal with a carrier frequency and second carrier signals with the carrier frequency, where the second carrier signals are, respectively, phase shifted by about 360°/n, with respect to the first carrier signal;
- a first pulse-width modulation means configured to receive an input signal and to pulse-width modulate the input signal with a first modulation frequency and by means of the first carrier signal and to output a first pulse-width modulated signal;
- second pulse-width modulation means configured to receive another input signal and to pulse-width modulate the other input signal with a second modulation frequency and by means of the second carrier signals, respectively, and to output second pulse-width modulated signals;
- filtering means configured to filter the first pulse-width modulated signal to obtain a first perturbed filtered signal and to filter the second pulse-width modulated signals to obtain second perturbed filtered signals;
- and
- a processing means configured to combine the first perturbed filtered signal and the second perturbed filtered signals to obtain an enhanced output wanted signal.
3 more elements
A system for suppressing perturbations in a signal, the system comprising:
- a modulated signal receiver operable to receive a modulated signal and a phase-shifted modulated signal;
- a filter module operable to:
- filter the modulated signal and output a filtered signal;
- and
- filter the phase-shifted modulated signal and output a phase-shifted filtered signal;
- and
- a combining unit operable to combine the filtered signal and the phase-shifted filtered signal and output a desired signal.
4 more elements
Dependencies are inferred from the claim text.