| 摘要 |
PURPOSE:To easily process a circuit at a later stage by a method wherein, when a motor is locked, a signal at an 'H' level is output and, when the motor is turned, an FG signal and a signal at an 'L' level are changed over in such a way either the FG signal or the signal at the 'L' level is output. CONSTITUTION:In a circuit, a fan driving motor is constituted of a magnesium detection circuit 1, of a positional-signal amplifier circuit 2, of an output circuit 3 and of a coil 4. A circuit-generation circuit 5 receives a signal from the positional-signal amplifier circuit 2, and it outputs an FG signal and discharge pulses. In addition, a lock alarm circuit 13 outputs a signal at an 'H' (or 'L') level when a motor is locked according to the output of a transistor 57, and it outputs either the FG signal or the signal at the 'L' (or 'H') level when the motor is turned. Then, a changeover circuit 14 controls the output of the transistor 57 in such a way that the lock alarm circuit 13 outputs either the FG signal or the signal at the 'L' (or 'H') level when the motor is turned. As a result, a circuit at a later stage can be processed easily. |
