METHOD FOR CONTROLLING POWER CHANNEL OF A CLASS D POWER AMPLIFIER Russian patent published in 2008 - IPC H03F3/20 H03M1/16 

FIELD: engineering of equipment for amplifying power of electric signals, possible use for amplifying power in sound reproduction systems, in devices of automatics, measuring and transformation equipment.

SUBSTANCE: control method includes using first transistor switch to generate positive impulses of constant duration, or suing second transistor key to generate negative impulses of the same amplitude and duration, impulses are filtered and injected into load, simultaneously impulses are subtracted from input amplifier of signals, then integrated and integrated differential signal is injected to input of comparator, where it is compared to supporting voltage, which is equal to lower level of dynamic range, and transistor switch control impulses are formed. New feature is that additional positive and negative supporting voltages are set, values of which are proportional to members of power series with base equal to two, except the first power of two, and compared to integrated differential signal, while values of voltages of output positive and negative impulses are generated proportionally to members of power series with base two, by means of first, second and additional transistor switches.

EFFECT: reduced dynamic range of signal amplification, reduced energy losses in switches of power channel.

2 cl, 2 dwg