Electric field attraction minimization circuit

Details Electric field attraction minimization circuit Electric field attraction minimization circuit

1994-12-01

1996-04-30

Chapman, John E.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

7351432, 7386261, 73862626, G01P 15125

Patent

active

055114202

ABSTRACT:
A circuit for minimizing electrostatic forces in capacitance-based sensor circuits. A sensor includes a movable mass that forms the center electrode of two differential capacitors, a sensing differential capacitor and an actuator differential capacitor. The other two electrodes of each differential capacitor are fixed. Oppositely phased high-frequency carrier signals are applied to the fixed electrodes of the sensing capacitor and biasing signals are applied to the fixed electrodes of the actuator capacitor. When a force is applied to the sensor, the capacitance of the sensing capacitor changes and the carrier signal, with its amplitude and phase modulated in accordance with the magnitude and direction of the force, appears on the movable mass. The signal on the mass is fed back to the fixed electrodes of the sensing capacitor to minimize electrostatic forces between the electrodes of the sensing capacitor. Using a separate negative feedback loop, a signal is fed back to the mass to generate electrostatic forces between the mass and the fixed electrodes of the actuator capacitor to restore the mass to its original position.

REFERENCES:
patent: 4584885 (1986-04-01), Cadwell
patent: 4932261 (1990-06-01), Henrion
patent: 4987779 (1991-01-01), McBrien

Affiliated with

Also associated with

Rating

Electric field attraction minimization circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electric field attraction minimization circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric field attraction minimization circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-621616