Patent ID: 7397150

Claim:
A method of driving a control circuit including first and second outputs via which a component defining a dc load is driven, the method comprising the steps of: selectively connecting each of said outputs to one of at least two potentials via a controllable plurality of switch devices; forming a dc drive voltage (UA) for said component from a difference between said potentials at said first and second outputs; adjusting a predetermined clocked waveform of said drive voltage (UA) by switching more than one of said switch devices; driving said switch devices so as to cause a switching operation to take place only in a first number of said switch devices in a first operating mode accompanied by a first power loss in said first number of said switch devices; driving said switch devices in a second operating mode so as to cause a switching operation to take place only in a second number of said switch devices accompanied by a second power loss in said second number of switch devices; and, during a time of supplying said dc drive voltage continuously as a constant dc drive voltage while not reversing polarity, periodically switching over between said first and second operating modes so that, alternately, at one of said outputs, a periodically clocked signal is generated and, simultaneously, at the other one of said outputs, a constant signal is generated so as to continuously form said constant dc drive voltage (UA) across said outputs to supply said dc load while simultaneously causing said first and second power losses to be equal.