Method and device for generating drive signals for a power output stage, and a power output stage
AssigneeSiemens Aktiengesellschaft
InventorPeter Schweighofer
Life of this patent
Estimating the term…
Abstract
In a method for generating respective drive signals for four switch elements of a power output stage, a start signal and a stop signal are generated depending on an on-duration value first and second changeover signals are generated for driving each of two switch elements depending on the start and stop signals; and the drive signals are generated depending on the first and second changeover signals. A drive device and a power output stage are operated according to this method.
Claims11
In an amplifier power output stage containing first, second, third and fourth switch elements arranged in a bridge circuit connected across a voltage source, said bridge circuit having a first bridge branch in which said first and second switch elements are connected in series and a second bridge branch in which said third and fourth switch elements are connected in series, a method for generating respective drive signals for said first, second, third and fourth switch elements comprising the steps of:
- generating a start signal and a stop signal for a voltage pulse of an output voltage of said output stage dependent on an on-duration value;
- generating a first changeover signal and a second changeover signal dependent on said start signal and said stop signal;
- generating respective drive signals for said first and second switch elements dependent on said first changeover signal;
- and
- generating respective drive signals for said third and fourth switch elements dependent on said second changeover signal.
A drive circuit for use with an amplifier power output stage containing first, second, third and fourth switch elements arranged in a bridge circuit connected across a voltage source, said bridge circuit having a first bridge branch in which said first and second switch elements are connected in series and a second bridge branch in which said third and fourth switch elements are connected in series, said drive circuit generating respective drive signals for said first, second, third and fourth switch elements and comprising:
- a start/stop module for generating a start signal and a stop signal for a voltage pulse of an output voltage of said output stage dependent on an on-duration value;
- a branch selection module for generating a first changeover signal and a second changeover signal dependent on said start signal and said stop signal;
- a first changeover module for generating respective drive signals for said first and second switch elements dependent on said first changeover signal;
- and
- a second changeover module for generating respective drive signals for said third and fourth switch elements dependent on said second changeover signal.
An amplifier power output stage comprising:
- a voltage source;
- first, second, third and fourth switch elements arranged in a bridge circuit connected across said voltage source, said bridge circuit having a first bridge branch in which said first and second switch elements are connected in series and a second bridge branch in which said third and fourth switch elements are connected in series;
- and
- a drive circuit for generating respective drive signals for said first, second, third and fourth switch elements comprising a start/stop module for generating a start signal and a stop signal for a voltage pulse of an output voltage of said output stage dependent on an on-duration value, a branch selection module for generating a first changeover signal and a second changeover signal dependent on said start signal and said stop signal, a first changeover module for generating respective drive signals for said first and second switch elements dependent on said first changeover signal, and a second changeover module for generating respective drive signals for said third and fourth switch elements dependent on said second changeover signal.
Dependencies are inferred from the claim text.