Force rebalance control system and method using automatic gain control loop
First Claim
1. A force rebalance control system using an automatic gain control loop, comprising:
- a gyroscope to detect a displacement signal of a mass body corresponding to an input angular velocity, and to adjust a displacement of the mass body;
a charge amplifier to convert the displacement signal detected by the gyroscope into a voltage signal, and to output the voltage signal;
a differentiator to output a velocity signal of the mass body on a basis of the displacement signal, output from the charge amplifier as the voltage signal;
a unity gain reference frequency output unit to output a sine wave signal having a phase, frequency, and unity gain identical to a phase and frequency of the velocity signal output from the differentiator;
a reference value input unit to generate a reference signal required to induce vibration of a sensing axis having uniform intensity regardless of the input angular velocity;
a controller to output a control signal, required for the gyroscope to vibrate with a predetermined amplitude, using the reference signal output from the reference value input unit; and
a multiplier to perform a multiplication operation on the sine wave signal, output from the unity gain reference frequency output unit, and the control signal, output from the controller, and to output a resulting voltage signal and apply the resulting voltage signal to the gyroscope.
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Accused Products
Abstract
The present invention relates to a force rebalance control system and method using an automatic gain control loop, which are configured to perform the force rebalance feedback control of a vibratory gyroscope using the automatic gain control loop for controlling the velocity signal of a mass body. Accordingly, the present invention is advantageous in that a conventional digital circuit, which is complicated and sensitive to noise, can be implemented using a simple analog circuit, and the present invention can be extended and applied to general- purpose vibratory gyroscopes or various sensor fields, such as those of an inertial sensor, a pressure sensor, and a temperature sensor, as well as micro-gyroscopes. Further, a force rebalance control system using an automatic gain control loop according to the present invention is applied to various sensors, thus improving performance, such as the dynamic range, bandwidth, and linearity of the sensors.
5 Citations
20 Claims
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1. A force rebalance control system using an automatic gain control loop, comprising:
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a gyroscope to detect a displacement signal of a mass body corresponding to an input angular velocity, and to adjust a displacement of the mass body; a charge amplifier to convert the displacement signal detected by the gyroscope into a voltage signal, and to output the voltage signal; a differentiator to output a velocity signal of the mass body on a basis of the displacement signal, output from the charge amplifier as the voltage signal; a unity gain reference frequency output unit to output a sine wave signal having a phase, frequency, and unity gain identical to a phase and frequency of the velocity signal output from the differentiator; a reference value input unit to generate a reference signal required to induce vibration of a sensing axis having uniform intensity regardless of the input angular velocity; a controller to output a control signal, required for the gyroscope to vibrate with a predetermined amplitude, using the reference signal output from the reference value input unit; and a multiplier to perform a multiplication operation on the sine wave signal, output from the unity gain reference frequency output unit, and the control signal, output from the controller, and to output a resulting voltage signal and apply the resulting voltage signal to the gyroscope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A force rebalance control method using an automatic gain control loop, comprising:
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a first step of detecting a fine displacement of a sensing axis provided in a gyroscope due to a displacement of a mass body; a second step of generating a velocity signal of the mass body on a basis of a displacement signal corresponding to the detected fine displacement; a third step of generating a sine wave signal having a phase, frequency, and unity gain identical to a phase and frequency of the velocity signal, and a control signal required for the gyroscope to vibrate with a predetermined amplitude; a fourth step of performing a multiplication operation on the sine wave signal and the control signal, thus generating an amplitude-modulated signal; and a fifth step of applying the amplitude-modulated signal to the gyroscope so as to maintain the displacement of the mass body at a uniform value. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification