Research On High Precision Digital Power Supply And Current Stabilization Circuit Of Laser Gyro

Laser gyro power supply circuit is an essential part of laser gyro system.At present,New requirements have been put forward to the digitization,localization and engineering of laser gyro power supply circuit in the industry.The research and design of laser gyro digital power supply can overcome the disadvantages of traditional analog power supply,such as large volume,difficult on-line adjustment and control,and relatively poor stability.The use of digital power supply in laser gyro can provide high stability and good reliability of all levels of voltage for laser gyro,optimize the power supply circuit,reduce the volume of power supply,for power integration,digitization and miniaturization has important significance.Based on the research on the peripheral circuit of laser gyro through the industry field,a digital power supply and a steady current circuit are designed to provide stable current and required voltages for laser gyro.In this paper,the digital power circuit of laser gyro is designed based on the single-ended counterattack topology used in the high voltage power supply and the push-pull topology used in the dither frequency stabilized power supply.Firstly,the composition and peripheral circuit of laser gyro are introduced.Then,the realization process of high voltage current stabilization circuit is analyzed.On the basis of the two kinds of topological structure design of the main power circuit and two sets of transformer,and then designed the AD sampling the input to the STM32 microcontroller for data processing,the processed microcontroller output corresponding duty ratio of PWM wave through the drive circuit to drive the switch tube conduction and shut off,keep the output voltage stability.The MCU software part of this paper first introduces the basic principle of fuzzy control,then introduces the design of fuzzy adaptive PID controller,including the design of fuzzy rule table,fuzzy subset and on-line self-correction process.Then,the main program is designed,including system initialization,fuzzy control algorithm and arithmetic mean filter algorithm.Finally,the power supply was tested,it mainly includes:using fuzzy PID control and uncontrolled voltage regulation time,power output voltage,current stability,load adjustment rate,power supply efficiency and power supply ripple.After testing calculation,the laser gyro’s single-arm current stability is better than 1×10^-3,and the dual-arm current difference stability is better than 1×10^-4.The load adjustment rates of-2300V,+300V and±48V power sources are 0.56%,0.50%and 1.44%,indicating that the power system has a good ability to suppress the disturbance caused by the load.When the power supply works stably,the efficiency of the high voltage power supply is 78.7%and the coefficient is 0.71%.The efficiency of the dithered and frequency-stabilized power supply is 81.0%and the coefficient is 0.21%and 0.1%,respectively.Compared with the traditional analog power supply is reduced to a certain extent.The results show that the digital power supply system meets the expected design requirements.