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US 2024/0413768 A1Published application
Drive circuit for an ultrasonic motor
AssigneeSeagate Technology LLC
InventorWenJun Cao
Life of this patent
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Abstract
A device includes a first set of switches and a second set of switches; a first filter and a second filter each comprising an unfiltered terminal and a filtered terminal; and a first piezoelectric element and a second piezoelectric element each comprising a first contact and a second contact. Turning on the first set of switches and turning off the second set of switches applies a first driving voltage to the first piezoelectric element and applies a second driving voltage to the second piezoelectric element.
Claims20
A device comprising:
- a first set of switches and a second set of switches;
- a first filter and a second filter each comprising an unfiltered terminal and a filtered terminal;
- and
- a first piezoelectric element and a second piezoelectric element each comprising a first contact and a second contact,
- wherein the filtered terminal of the first filter is coupled to the first contact of the first piezoelectric element and the first contact of the second piezoelectric element,
- wherein the filtered terminal of the second filter is coupled to the second contact of the second piezoelectric element, and
- wherein turning on the first set of switches and turning off the second set of switches:
- couples a first voltage source terminal of a voltage source to the unfiltered terminal of the first filter,
- produces a first filtered voltage at the filtered terminal of the first filter,
- couples a second voltage source terminal of the voltage source to the second contact of the first piezoelectric element and to the unfiltered terminal of the second filter,
- produces a second filtered voltage at the filtered terminal of the second filter,
- applies a first driving voltage to the first piezoelectric element, and
- applies a second driving voltage to the second piezoelectric element.
10 more elements
A drive circuit for an ultrasonic motor, the drive circuit comprising:
- a first set of switches and a second set of switches;
- a first filter and a second filter each comprising an unfiltered terminal and a filtered terminal;
- and
- a first piezoelectric element and a second piezoelectric element each comprising a first contact and a second contact,
- wherein the filtered terminal of the first filter is coupled to the first contact of the first piezoelectric element and the first contact of the second piezoelectric element,
- wherein the filtered terminal of the second filter is coupled to the second contact of the second piezoelectric element, and
- wherein turning on the first set of switches and turning off the second set of switches:
- couples a first voltage source terminal of a voltage source to the unfiltered terminal of the first filter,
- produces a first filtered voltage at the filtered terminal of the first filter,
- couples a second voltage source terminal of the voltage source to the second contact of the first piezoelectric element and to the unfiltered terminal of the second filter,
- produces a second filtered voltage at the filtered terminal of the second filter,
- applies a first driving voltage to the first piezoelectric element, and
- applies a second driving voltage to the second piezoelectric element.
10 more elements
A method comprising the steps of:
- coupling a filtered terminal of a first filter to a first contact of a first piezoelectric element and a first contact of a second piezoelectric element;
- coupling a filtered terminal of a second filter to a second contact of the second piezoelectric element;
- applying, between a first voltage source terminal and a second voltage source terminal of a voltage source, a time-dependent source voltage comprising a source voltage waveform;
- and
- coupling, by turning on a first set of switches and turning off a second set of switches, the first voltage source terminal to an unfiltered terminal of the first filter, and the second voltage source terminal to a second contact of the first piezoelectric element and to an unfiltered terminal of the second filter.
2 more elements
Dependencies are inferred from the claim text.