Abstract: An amplitude regulation circuit which includes a maximum detection circuit which outputs a maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal switches between signals V1, V2, and V3. The amplitude regulation circuit also includes a minimum detection circuit which outputs a minimum signal MIN that is distorted to some extent during and around a time when a lowest-level signal switches between signals V1, V2, and V3. Such distortions reduce variations in amplitude detection signal AMP that represents a difference between MAX and MIN. The amplitude regulation circuit amplifies rotor position signals H1 to H3 based on amplitude detection signal AMP according to AGC, thereby maintaining amplitudes of signals V1 to V3 constant while maintaining sinusoidal waveforms.

Abstract: An amplitude regulation circuit which includes a maximum detection circuit which outputs a maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal switches between signals V1, V2, and V3. The amplitude regulation circuit also includes a minimum detection circuit which outputs a minimum signal MIN that is distorted to some extent during and around a time when a lowest-level signal switches between signals V1, V2, and V3. Such distortions reduce variations in amplitude detection signal AMP that represents a difference between MAX and MIN. The amplitude regulation circuit amplifies rotor position signals H1 to H3 based on amplitude detection signal AMP according to AGC, thereby maintaining amplitudes of signals V1 to V3 constant while maintaining sinusoidal waveforms.

Abstract: An amplitude regulation circuit which includes a maximum detection circuit which outputs a maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal switches between signals V1, V2, and V3. The amplitude regulation circuit also includes a minimum detection circuit which outputs a minimum signal MIN that is distorted to some extent during and around a time when a lowest-level signal switches between signals V1, V2, and V3. Such distortions reduce variations in amplitude detection signal AMP that represents a difference between MAX and MIN. The amplitude regulation circuit amplifies rotor position signals H1 to H3 based on amplitude detection signal AMP according to AGC, thereby maintaining amplitudes of signals V1 to V3 constant while maintaining sinusoidal waveforms.

Abstract: In an amplitude regulation circuit, a maximum detection circuit outputs maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal switches between signals V1, V2, and V3. Meanwhile, a minimum detection circuit outputs minimum signal MIN that is distorted to some extent during and around a time when a lowest-level signal switches between signals V1, V2, and V3. Such distortions serve to reduce variations in amplitude detection signal AMP that represents a difference between MAX and MIN. The amplitude regulation circuit amplifies rotor position signals H1 to H3 based on amplitude detection signal AMP according to AGC, thereby keeping amplitudes of signals V1 to V3 constant while maintaining sinusoidal waveforms. A motor driving control apparatus drives a motor based on signals V1 to V3. Since this circuitry does not include a smoothing capacitor, high AGC responsiveness is achieved.