US 5,317,259 AGranted

DC-based magnetic field controller

AssigneeThe United States of America as represented by the United States Department of Energy

InventorsDale K. Kotter, Richard A. Rankin, John P,. Morgan

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Abstract

A magnetic field controller for laboratory devices and in particular to dc operated magnetic field controllers for mass spectrometers, comprising a dc power supply in combination with improvements to a hall probe subsystem, display subsystem, preamplifier, field control subsystem, and an output stage.

Claims7

Dependent claims

An apparatus for the control of a magnetic field comprising:

a dc power supply;
a hall probe subsystem receiving a dc current from said dc power supply and including means for generating a hall effect signal, means for biasing said dc current having a voltage regulator, a precision voltage reference, and a dc-to-dc converter, a temperature compensation circuit, and means for providing a constant current to said means for generating said hall effect signal;
means for amplifying said hall effect signal, having a preamplifier which includes a chopper stabilized preamplifier, said preamplifier adapted to receive said hall effect signal from said hall effect generator and wherein said chopper stabilized preamplifier receiving said hall effect signal and having the ability to further transmit an amplified hall effect signal;
a field control subsystem including means for field control adapted to receive said amplified hall effect signal from said chopper stabilized preamplifier and having the ability to generate a control signal, and said means for field control having a manual field control mode and computer field control mode and wherein while in said computer field control mode of operation said means for field control has the ability to adjust said control signal to compensate for real time monitoring of said magnetic field;
a display subsystem adapted to receive and display said amplified hall effect signal from said chopper stabilized preamplifier, and including an interface means having the ability to receive said amplified hall effect signal, said interface mans including an IEEE interface circuitry having the ability to digitize a magnetic field reading, which allows real time monitoring by said field control subsystem;
and
an output controller adapted to receive said control signal from said means for field control, ad said output controller including means for stabilizing said control signal, and means for magnetic field interface, said means for magnetic field interface having the ability to adjust said magnetic field in response to said control signal.

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Dependencies are inferred from the claim text.

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Abstract

An apparatus for the control of a magnetic field comprising:

a dc power supply;
a hall probe subsystem receiving a dc current from said dc power supply and including means for generating a hall effect signal, means for biasing said dc current having a voltage regulator, a precision voltage reference, and a dc-to-dc converter, a temperature compensation circuit, and means for providing a constant current to said means for generating said hall effect signal;
means for amplifying said hall effect signal, having a preamplifier which includes a chopper stabilized preamplifier, said preamplifier adapted to receive said hall effect signal from said hall effect generator and wherein said chopper stabilized preamplifier receiving said hall effect signal and having the ability to further transmit an amplified hall effect signal;
a field control subsystem including means for field control adapted to receive said amplified hall effect signal from said chopper stabilized preamplifier and having the ability to generate a control signal, and said means for field control having a manual field control mode and computer field control mode and wherein while in said computer field control mode of operation said means for field control has the ability to adjust said control signal to compensate for real time monitoring of said magnetic field;
a display subsystem adapted to receive and display said amplified hall effect signal from said chopper stabilized preamplifier, and including an interface means having the ability to receive said amplified hall effect signal, said interface mans including an IEEE interface circuitry having the ability to digitize a magnetic field reading, which allows real time monitoring by said field control subsystem;
and
an output controller adapted to receive said control signal from said means for field control, ad said output controller including means for stabilizing said control signal, and means for magnetic field interface, said means for magnetic field interface having the ability to adjust said magnetic field in response to said control signal.

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