Duty cycle clipper
AssigneeICEpower a/s
InventorKennet Skov Anderson
Life of this patent
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Abstract
A power conversion system comprising an amplifier input for receiving an analog input signal and an amplifier output for providing a switching output signal is disclosed. The system is applicable for use in high definition switching audio amplification. The power conversion system further comprises a clipper for clipping the analog input signal having a predefined range limited by a clipping level, a pulse modulator and a switching power stage. The system further has a feedback path to the clipper including a duty cycle measuring unit and a clip level filter which generates a clip level signal and where the clipping level of the clipper is controlled by the clip level signal. Hereby it is e.g. possible to clip an analog input signal with good precision and reliability in a switching power conversion system.
Claims18
A power conversion system comprising:
- an amplifier input for receiving an analogue input signal;
- an amplifier output for providing a switching output signal;
- a clipper for clipping the analogue input signal to provide a clipped input signal having a predefined range limited by a clipping level;
- a pulse modulator for modulating the clipped input signal to form a pulse width modulated (PWM) signal;
- a switching power stage for amplification of the PWM signal to form the switching output signal;
- and
- a feedback path to said clipper, which feedback path includes:
- a duty cycle measuring unit configured to measure a duty cycle of the PWM signal and generate a measurement signal indicative of the duty cycle;
- and
- a clip level filter configured to receive said measurement signal and provide a clipping voltage;
- wherein the clipper is connected to receive the clipping voltage and configured to adjust the clipping level based on the clipping voltage.
A method for power conversion comprising the steps of:
- receiving an analogue input signal;
- clipping the analogue input signal to provide a clipped input signal having a predefined range limited by a clipping level;
- modulating the clipped input signal to form a pulse width modulated (PWM) signal;
- amplifying the PWM signal to form a switching output signal;
- measuring a duty cycle of the PWM signal and generate a measurement signal indicative of said duty cycle;
- and
- filtering the measurement signal to provide a clipping voltage;
- wherein the step of clipping the analogue input signal is based on said clipping voltage.
Dependencies are inferred from the claim text.