APPARATUS FOR DETECTING DRIVING OF MOTOR IN ELECTRONIC TIMEPIECE

摘要

PURPOSE:To determine the rotation and the non-rotation of a rotor accurately, by applying driving pulses, thereafter applying fluctuating pulses to a driving coil when the rotor is stopped, and comparing and detecting the voltage waveform, which is induced in the coil by the fluctuation of the rotor. CONSTITUTION:Pulses 7 and 8 are applied to switch elements P1 and N1. Then a leftward current flows through a driving coil 5 by way of the elements P2 and N1, and a rotor is rotated rightward. After several tens of milliseconds, short fluctuating pulses 3 and 4 are applied to the elements P1 and N2. Then a fluctuating current flows through the coil 5. Pulses 22 and 23 are applied to the elements P1 and S1 when the fluctuating rotor is recovered to the original state. Then an instantaneous high voltage is generated across a resistor Rs having a high resistance value. The voltage is compared and detected, and the driving is controlled. When non-rotation is detected, broad pulses 11 and 12 are inputted to P1 and N1, and the missing rotation of the rotor is corrected. After the rotor 1 has performed stepping rotation, pulses 11'-23' are applied to P2, N2 and S2 by the same way, and the rightward current is made to flow through the coil 5, and the rotation and the non-rotation are detected. In this constitution, the detecting accuracy of rotation is improved and low power consumption can be achieved.