Authors A.N. Akolzin, D. G. Kovtun, A.A. Legin
Month, Year 06, 2017 @en
Index UDC 621.383
Abstract The current trends in the development of energy use metering devices have brought into life digital devices, which, alongside with traditional metering instruments, provide a number of addi-tional features. Among them are the following: correction of the energy use readings, logging function, interaction with metering devices to control the readings through various interfaces (both wired and wireless). These instruments are autonomous devices, working on battery supply of 2–3,5 А•of capacity, which can be replaced during the device calibration. The run-time between autonomous power supply replacement periods ranges between 5 and 10 years. The main consum-ers are microprocessor, measuring circuit and display devices. The power consumption of the microprocessor and the display devices are known from the technical documentation and can be minimized by choosing the optimum operating mode. This paper dwells on the methods for reduc-ing the energy consumption of a measurement system consisting of an optical pair of an emitter (an infrared LED) and a receiver (phototransistor). The characteristics of the system power use at various parameters of the scanning pulse, optical circuits and the components used as measuring circuits in metering energy. Oscillograms of the effects and responses of the optical system are given for different durations and options to reduce energy use. A method for reducing power con-sumption by reducing the pulse width, which, on the other hand, leads to an increase in the LED current, is considered. Besides, options for restoring waveforms based on amplifiers and compara-tors with low power consumption are considered.

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Keywords Optical emitters; metering devices; measuring circuits.
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