SU1273815A1 - Wide-band a.c.-to d.c. converter - Google Patents

Abstract

The invention relates to the field of electrical measuring equipment. It can be used to accurately convert high-frequency voltages. The purpose of the invention — to improve the accuracy of converting an alternating voltage to a constant — is achieved by reducing the multiplicative error of the stroboscopic transformation. For this purpose, a stroboscopic converter 5, detector 6, feedback link 7, low-pass filter 8 and adders 9, 10 and 11 are additionally introduced into the device. The drawing also shows the synchronization unit 1, the stroboscopic converter 2, filter 3, detector 4 . i In comparison with the known devices, the proposed wideband W converter reduces the error from 10-20% to 1.5-3%. 1 il.

Description

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This invention relates to electrical measuring technology.

The aim of the invention is to improve the accuracy of converting a variable voltage to a constant one.

The drawing shows a structural diagram of a wideband AC-to-constant voltage converter.

The wideband converter contains synchronization unit 1, the first stroboscopic converter 2, filter 3, the first detector 4, the second stroboscopic transform. 5, the second detector 6. feedback link 7 j, low-pass filter 8 and the first 9, second 10 and third 11 adders. The device input through the synchronization unit 1 is connected to the second input of the first stroboscopic converter 2, the first input of which is connected to the device input, and the output through the filter 3 and the first detector 4 to the first input of the first adder 9, the second input of which is connected to the output of the third adder 11, and the output is in the device code, while the output of the first detector 4 is connected via a link 7 to the back coupling to the first input of the second adder 10, the second input of which is connected to the input of the device, and the output to the first input of the second row the boscopic converter 5, the second input of which is connected to the output of synchronization unit 1, and the output through the low-pass filter 8 to the first input of the third adder 11, and through the second detector 6 to the second input of the third adder 11.

The device works as follows. .

The high-frequency voltage U is fed to the first input of the first stroboscopic converter 2 and is converted by it to an intermediate fixed frequency of 20 kHz. This voltage, passed through filter 3, is converted into constant voltage U in the detector 4, through feedback link 7 this voltage The voltage arrives at the first input of the second adder 10, and the feedback voltage Ug, (,, is simultaneously generated. At the same time, the high-frequency voltage U g arrives at the second input of the second adder 10. The summed voltage arrives at the first input. one second strobe

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 a scoop converter 5. A voltage is removed from its output, containing a variable component U, proportional to AND and a constant

5 component And proportional to Ug (. The alternating voltage U, taken from the output of the second stroboscopic converter 5, in the second detector 6 is converted into a constant voltage U, and fed to the second input of the adder 11 (constant U detector 6 is filtered out), the constant is component and passes without loss through

15, the low-pass filter 8 and the adder 11 is subtracted from the constant voltage taken from the output of the second detector 6. The differential voltage iU Uj is fed to the second input

20 of the first adder 9, the first input of which receives a constant voltage U, taken from the output of the first detector 4, In the first adder 9 these voltages are summed and form the voltage Ug ,,,,; which is the output voltage of all devices, From the output of the synchronization unit 1, strobe pulses are taken, which are synchronized with

30 by high frequency voltage and low fixed frequency voltage.

The operation of the synchronization unit 1 is based on the use of an automatic locking system for PLL locking into synchronism.

Claims (1)

Shadow Formula The wideband AC voltage to DC converter contains a synchronization unit and a first strobe converter connected in series, a first detector filter, the device input connected to the first input of the first stroboscopic converter and the input of the synchronization unit whose output is connected to the second input of the first stroboscopic converter, characterized by that, in order to increase accuracy, a second stroboscopic converter, a second detector, a link about brotherhood 5 low pass filter, the first, second and third adders, with the first detector outlets connected to the first input of the first adder, and through the star 3112738154 But the feedback to the first input is through the low-pass filter of the second adder, the second input of the kona with the first input of the third summation is connected to the input of the device, the torus, and through the second detector - with the output connected to the first input of the second an adder with a stroboscopic transform of the output of which is connected to the second hotel, the second input of which is connected to the house of the first adder, the output of which is the output of the synchronization unit, and the other is the output of the device.