Motor drive circuit

Details Motor drive circuit Motor drive circuit

2008-03-14

2010-12-21

Masih, Karen (Department: 2837)

Electricity: motive power systems

With particular motor-driven load device

Plural, diverse or diversely controlled load device

C318S400050, C318S400060

Reexamination Certificate

active

07855521

ABSTRACT:
A pulse generation unit generates a PWM signal whose duty ratio changes according to a target torque of a motor. A back electromotive detection circuit compares a back electromotive voltage generated at a coil of the motor with a middle point voltage of the coil, and outputs a back electromotive detection signal that becomes high level at a timing of the zero crossing point. A phase adjustment unit compares phases of the back electromotive detection signal and a reference signal that becomes a predetermined level at a predetermined timing, and adjusts the duty ratio of the PWM signal by feedback so that the phase error becomes a minimum. A frequency adjustment unit adjusts the frequency of the PWM signal such that the frequency of the PWM signal becomes integral multiples of the frequency of the back electromotive detection signal.

REFERENCES:
patent: 2003/0075997 (2003-04-01), Keim et al.
patent: 3-207250 (1991-09-01), None
patent: 10-243685 (1998-09-01), None
patent: 11-75388 (1999-03-01), None

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