Method for calibrating power supply and tuning power supply unit

Abstract

The invention discloses a method for calibrating a power supply and tuning power supply unit. A calibrating system comprises the power supply and tuning power supply unit, a computer and a program-controlled multi-channel switch. The power supply and tuning power supply unit is internally provided with an AD voltage acquisition module, the two-stage digital-to-analogue conversion combination is utilized to adjust power output voltage, the voltage output range is adjusted by coarse tuning digital-to-analogue conversion, and the round-off error compensation is performed by fine tuning digital-to-analogue conversion. The voltage output is divided into a plurality of output ranges in the calibrating process, and the voltage output is calibrated respectively in each range. An array{Vi, N1i, N2i} of the voltage, the fine tuning digital-to-analogue conversion value N1 and the fine tuning digital-to-analogue conversion value N2 is obtained by calibrating a plurality of points, a curvilinear equation can be obtained by utilizing Chebyshev curve fitting, and the digital-to-analogue conversion value is calculated through the arrangement of the curvilinear equation.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a calibration method for power supply and tuning power supply devices. Background technique [0002] The power supply unit is mainly used to supply power to the equipment under test. In aviation, aerospace and high-speed digital communication industries, a wide range of high-precision power supply devices are required to supply power to VCO, YTO and other tuned oscillation devices. When measuring the output frequency, power, and phase noise indicators of VCO and YTO oscillators, the power supply module is required to have a higher voltage output range and output resolution. [0003] After the traditional power supply is converted by the DC-DC module, the output voltage is changed by adjusting the analog conversion DAC. When setting the DAC value, the DAC parameter value can only be accurate to an integer, and the setting within the decimal range will not be valid, which will lose t...

AI Technical Summary

Problems solved by technology

This method will add additional measuring instruments during calibration, increasing the cost, and when the external device measures the voltage, due to the voltage division of the external device, the measured voltage will be inaccurate, which will directly affect the accuracy of the calibration.

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