DRIVING CIRCUIT OF SINGLE PHASE BRUSHLESS MOTOR

摘要

PURPOSE: A driving circuit of a single phase brushless motor is provided to drive a single-phase brushless motor without using a position detection element including a hall device. CONSTITUTION: A first driving current and a second driver current are not supplied to a driving coil(9) in a non-conductive period. The driving signal generation circuit generates the first driving current and the driving signal to supply them to the driving coil. An output circuit(20) supplies the first or the second driver current to the driving coil according to the driving signal. A zero cross detection circuit detects a zero-cross of the induced voltage generated in the driving coil in the non-conductive period. [Reference numerals] (11) Main counter; (12) Driving period memory register; (13) Conductive time setting register; (14) Loop counter; (16) Timing control circuit; (1a) Motor driving circuit; (20) Output circuit; (30) Induced voltage detection circuit; (50) Edge detection circuit