End of stroke detection for electromagnetic pump
First Claim
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1. An electromagnetic pump system comprising:
- an electromagnetic pump comprising a coil that can be energized to produce a pump stroke, wherein the electromagnetic pump further comprises an actuator moveable in response to the energization of the coil;
a direct current power source connected to selectively energize the coil of the electromagnetic pump, wherein the power source applies a source electrical potential to the coil to pass a coil current therethrough;
a voltage sense device for sensing the source electrical potential applied to the coil;
a current sense device for sensing the coil current; and
control electronics to detect the end of a pump stroke based on a change in flux over time calculated as a function of sensed coil current and source electrical potential, wherein the change in flux over time is calculated independent of coil inductance Lcoil.
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Abstract
Detection of end of stroke for an electromagnetic pump is performed using, for example, a calculated first flux derivative.
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Citations
16 Claims
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1. An electromagnetic pump system comprising:
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an electromagnetic pump comprising a coil that can be energized to produce a pump stroke, wherein the electromagnetic pump further comprises an actuator moveable in response to the energization of the coil; a direct current power source connected to selectively energize the coil of the electromagnetic pump, wherein the power source applies a source electrical potential to the coil to pass a coil current therethrough; a voltage sense device for sensing the source electrical potential applied to the coil; a current sense device for sensing the coil current; and control electronics to detect the end of a pump stroke based on a change in flux over time calculated as a function of sensed coil current and source electrical potential, wherein the change in flux over time is calculated independent of coil inductance Lcoil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable infusion device for delivery of infusion medium, the infusion device comprising:
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a drive mechanism comprising a coil that can be energized to produce a pump stroke, wherein the drive mechanism further comprises an actuator moveable relative to the coil in response to the energization of the coil to deliver infusion medium; a direct current power source connected to selectively energize the coil of the electromagnetic pump, wherein the power source applies a source electrical potential to the coil to pass a coil current therethrough; one or more sense devices to sense the source electrical potential applied to the coil and to sense the coil current; and control electronics to detect the end of a pump stroke based on a change in flux over time calculated as a function of sensed coil current and source electrical potential, wherein the change in flux over time is calculated independent of coil inductance Lcoil, and wherein the control electronics further comprises a switch device connected between the power source and the coil to connect the power source to the coil at the initiation of a pump stroke and disconnect the power source from the coil upon detection of an end of the pump stroke. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification