Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2011-01-04
2011-01-04
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S293000, C318S400260, C318S400270, C318S400280
Reexamination Certificate
active
07863841
ABSTRACT:
A method for driving a load by using an output stage amplifier in full bridge configuration whose supply is modulated by means of a fast switching power converter, controlled in order to maintain the stage's output common mode at its minimum voltage, is presented. The modulation of the switching power converter output is obtained by a feedback control system regulating directly the voltage of the bridge output stage terminals. This bridge unipolar class H stage allows driving the load with high accuracy and improved efficiency without introducing switching noise and EMI at the load terminals typical of PWM driving. This method can be applied with the same benefits to class AB, pseudo class AB or to class A output stages. When this method is associated with an imposed current driving approach and with a current oversampling digital to analog converter the resulting advantages are very significant for accurate motor control applications.
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Menegoli Paolo
Sawtell Carl
Glass Erick
Ro Bentsu
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