Citation: | Chen Xian, Yang Jianhua, Zhou Yilan, et al. The application of low-noise DC-DC power source in fiber-optic gyroscope system[J]. Opto-Electronic Engineering, 2018, 45(1): 170517. doi: 10.12086/oee.2018.170517 |
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Overview: The fiber-optic gyroscope (FOG), is a precise angular velocity sensor. In its work, weak electrical signal has been produced and acquired, so noise of power supply may interfere in the circuit of FOG and reduce its performance. DC-DC converter is normal power supply of FOG, and its noise can be divided into two parts, ripple wave and spike noise. The ripple wave is easy to be reduced by power filter, but spike noise is hard to be suppressed because of its high frequency and radiation characteristic. The spike noise can interfere into the signal acquisition circuit and mix into acquisition result due to the spectrum aliasing. Spurious triggering of FOG digit circuit may also come out as a result of serious spike noise. The spike noise comes from high harmonic signals of switch devices. Switch devices generate square wave signal and its spectrum covers form low frequency to high frequency. The signals above the order of 10 MHz always remains after rectification and filtration and spike noise is combination of these high harmonic signals in time domain. So preventing the generation of high harmonic signals is the key to reduce spike noise. Soft-switching technology can be used to reduce spike noise but the result is still unsatisfactory. Slew rate control technology is a good way to reduce and eliminate spike noise. Slew rate determines the bandwidth of signal, and less high harmonic signals will be generated if slew rate has been controlled as expected. So slew rate control is the suitable technical route for low-noise power supply for FOG system. After taking use of slew sate controlled DC-DC Controller, the low noise power module has been designed and developed. The power module consists of DC-DC circuit and LDO circuit, and the slew rate of DC-DC circuit has been controlled so that the spike noise was eliminated successfully. The oscilloscope with analog bandwidth of 200 MHz was used to test the noise characteristic of the developed power module, and the peak-to-peak noise value was tested to be about 1mV in the full bandwidth, which is obviously low compared with the normal DC-DC converter. Experiment has been designed to test the performance of FOG system after using the low noise power module. Two typical FOG products were tested, and the noise performance improvement of FOG output was 3.1% and 4.4%. A conclusion can be drawn that low-noise power module is beneficial for the performance of FOG.
The structure of FOG circuit system
The test result of typical DC-DC noise
Simulation result of the cause of DC-DC spike noise. (a) The non-ideal square wave with bandwidth of 500 MHz; (b) The consequence signal after going through a 100 MHz second order Butterworth high-pass flter
The relationship between slew rate and bandwidth of square wave signal
The scheme of a practicable slew control circuit
The function block diagram of low-noise power module
The low-noise power module product and its noise test result. (a) The fnished product of low-noise power module; (b) The noise test result of low-noise power module by 200 MHz oscilloscope
Comparison test scheme of the FOG performance under different power noise conditions