Control circuit with dual programmable feedback loops for...

Details Control circuit with dual programmable feedback loops for... Control circuit with dual programmable feedback loops for...

2009-05-14

2011-11-01

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400030, C318S400050

Reexamination Certificate

active

08049448

ABSTRACT:
A BLDC (brushless direct current) motor system of the present invention includes a control circuit, a sequencer, a driving circuit, and a BLDC motor. The control circuit comprises a speed-feedback loop and a torque-feedback loop to control the maximum speed and the maximum torque of the BLDC motor in parallel configuration. The speed-feedback loop generates a speed-control signal. The torque-feedback loop generates a torque-control signal. A PWM circuit receives the speed-control signal and the torque-control signal to generate a PWM signal. A pulse width of the PWM signal is correlated to the level of the speed-control signal and/or the level of the torque-control signal.

REFERENCES:
patent: 4429262 (1984-01-01), Utenick
patent: 4544868 (1985-10-01), Murty
patent: 4591774 (1986-05-01), Ferris et al.
patent: 4686437 (1987-08-01), Langley et al.
patent: 5210474 (1993-05-01), Oswald

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