A square wave excitation device for a sensor and an excitation method thereof
A sensor and square wave technology, applied in the direction of measuring devices, instruments, gyroscopes/steering sensing equipment, etc., can solve the problems of complex excitation power supply circuit, simple sine wave frequency, few high-order harmonics, etc., and achieve power supply efficiency low, improve reliability, and reduce power consumption
Active Publication Date: 2016-08-31
SHAANXI BAOCHENG AVIATION INSTR
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[0002] Traditional precision sensors such as gyroscopes and accelerometers use sine wave signals for excitation. figure 1 , including the excitation signal source, sensor annunciator, preamplifier, AC amplifier, demodulator, DC amplification and correction unit and power amplifier unit connected in sequence. The sine wave is characterized by pure frequency and few high-order harmonics. Therefore, the zero output of the annunciator is small when there is no quadrature component signal, but the excitation power supply circuit is relatively complex, the power supply efficiency is low, and the power consumption is large
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[0022] The present invention will be further described in detail through specific embodiments below.
[0023] see figure 1 A square wave excitation device for a sensor is composed of an excitation signal source, a sensor annunciator, a preamplifier, an AC amplifier, a demodulator, a DC amplification and correction unit, and a power amplifier unit connected in sequence. The excitation signal source is a square wave excitation signal, and a switch filter unit with two filter capacitors is connected between the preamplifier and the AC amplifier.
[0024] see figure 2 , the square wave excitation signal required by the above excitation signal source is an excitation signal with sufficient power obtained after the reference square wave is connected to the switching power amplifier unit, and the reference square wave should meet the frequency requirements of the sensor annunciator.
[0025] After the square wave excitation signal is connected to the sensor annunciator, the output...
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The invention provides a square-wave excitation device of a sensor and an excitation method of the sensor, which are particularly applied to a gyro rebalancing loop system. According to the invention, on the premise of satisfying precision requirements, sine wave is replaced by square wave to excite; combined with double filtering of a switch filter of a filter capacitor and the orthogonal removal effect, influence to product performances caused by large signal blockage in high gain is avoided; dependency on a precise sine-wave excitation power supply is reduced, therefore, the product is reduced in cost and increased in reliability; the square-wave excitation device of the sensor and the excitation method of the sensor disclosed by the invention can be applied to other devices in need of excitation signals.
Description
technical field [0001] The invention belongs to the technical field of signal excitation of a sensor servo system, and in particular relates to a square wave excitation device of a sensor and an excitation method thereof, and is especially suitable for a gyroscope rebalancing loop system. Background technique [0002] Traditional precision sensors such as gyroscopes and accelerometers use sine wave signals for excitation. figure 1 , including the excitation signal source, sensor annunciator, preamplifier, AC amplifier, demodulator, DC amplification and correction unit and power amplifier unit connected in sequence. The sine wave is characterized by pure frequency and few high-order harmonics. Therefore, the zero output of the annunciator is small when there is no quadrature component signal, but the excitation power supply circuit is relatively complex, the power supply efficiency is low, and the power consumption is large. Under normal circumstances, in order to pursue sma...
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IPC IPC(8): G01C19/00
CPCG01C19/00
Inventor 赵治伟陈磊江黄凯郑群英马骏马英华刘剑锋
Owner SHAANXI BAOCHENG AVIATION INSTR