Zeitverzögerungsgenerator für die Kommutierung eines mehrphasigen bürstenlosen Motors

摘要

A commutation control circuit provides a substantially periodic series of commutation signals to a conventional motor sequencer. The control circuit includes a frequency-to-current converter that receives the series of commutation signals and outputs a current that has a magnitude proportional to the average period of the series of commutation signals. The proportional current is then used to charge and/or discharge a known capacitance after a back-EMF sensor determines the appropriate starting time of a delay period. The capacitance and the proportional current are selected such that the proportional current charges the capacitance to a selected voltage level to trigger a commutation signal after the appropriate delay period.