Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Reexamination Certificate
2008-06-10
2008-06-10
Donovan, Lincoln (Department: 2837)
Electricity: motor control systems
Open loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
C388S830000
Reexamination Certificate
active
07386224
ABSTRACT:
A DC brushless fan motor driving circuit has a Hall PWM signal generator, a speed signal generator, a PWM driver and a full-bridge switching circuit. The Hall PWM signal generator obtains a Hall sine wave signal from an external Hall sensor and converts the Hall sine wave signal to a varied Hall PWM signal. The speed signal generator is connected to an external PWM input signal to set speed of a fan motor and a low speed voltage to determine a present speed setting signal. The speed signal generator further obtains the varied Hall PWM signal to compare the present speed setting signal to generate a SPWM signal to the PWM driver. The PWM driver outputs a SPWM signal to the full-bridge switching circuit and then coil current is formed close to a sine wave signal to decrease the electromagnetic noise.
REFERENCES:
patent: 7138776 (2006-11-01), Gauthier et al.
patent: 7276877 (2007-10-01), Qiu et al.
Adda Corp.
Bacon & Thomas PLLC
Brandt Michael
Donovan Lincoln
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