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PRINCIPLES AND METHODS OF FORMING THE DURATION OF A PULSE PACKET FOR THE ELECTROSPARK TRIMMING OF RESISTORS

V. N. Leukhin, E. V. Shabdarov
Volga State University of Technology,
3, Lenin Square, Yoshkar-Ola, 424000, Russian Federation
E-mail: LeuhinVN@volgatech.net

ABSTRACT

Introduction. The resistor trimming process should meet a number of requirements: high efficiency of performance and accuracy must be maintained simultaneously and the value of rated dissipated power should be saved. The parameters «accuracy-performance» are most frequently considered together, since they are always contradirectional: the improvement of the one causes the deterioration of the other. In fact, the obtainable accuracy d is limited by the value of resistance increase in one cycle of the trimming, which can be a multiple of trimming cycle duration or execution unit actuation time (laser beam cut-off time, mechanical system stop time and etc.). In many cases, the trimming cycle is determined by the sum of times of the energy effect on the resistive material and the resistance measurement. The purpose of the work is the analytical review of possible methods of control of two main characteristics of the electrospark trimming process: accuracy and performance, experimental and analytical research of different methods of pulse packet duration control, the development of technical means of pulse packet duration shaper realization. The analytical review of possible methods of accuracy and performance control. The algorithm model of the trimming process is offered. It contains cycles of constant duration and trimming cycles of variable duration. The block diagram of the trimming device with the automatic change of pulse packet duration is presented. Different types of pulse packet duration control realization based on analog means (using a posistor as a control element by means of comparison of bridge unbalance voltage with rectified pulsating electric mains voltage) have been analyzed. It is shown that the best solution is providing the automatic change of pulse packet duration both during the trimming towards the increase in resistance and the decrease in resistance that takes place during the electrospark trimming. Moreover, different methods of convergence algorithm implementation, providing the minimum number of variable duration cycles have been considered. It is shown that the use of the dependence   allows reducing the number of cycles of variable duration to 5. Results of experimental research showed high efficiency of suggested solutions. In particular, when using the automated complex, the number of discharge pulses with steps from 1 to 7 changed from 816 to 2 and the deviation of resistance from the rating was from 14,025 to 0,026 %. Conclusion. The most efficient method and means is the method of forming the duration of the pulse packet in case of resistor trimming towards the increase in resistance and the decrease in resistance using the rectifier and the inverting summator as well as the use of pulse packet duration change laws based on trigonometric functions that allows reducing the number of variable duration cycles to five.

KEYWORDS

electrospark trimming of resistors; trimming cycle duration formation; performance; accuracy.

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REFERENCES

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For citation: Leukhin V. N., Shabdarov E. V. Principles and Methods of Forming the Duration of a Pulse Packet for the Electrospark Trimming of Resistors. Vestnik of Volga State University of Technology. Ser.: Radio Engineering and Infocommunication Systems. 2018. No 2 (38). Pp. 58-76. DOI: 10.15350/2306-2819.2018.2.58