SU1737660A1 - Quasi-sinusoidal voltage source - Google Patents

Abstract

SUMMARY OF THE INVENTION: The source contains a linearly varying voltage generator 1 associated with the input of an analog voltage multiplier 2, the second input of which is connected to the output of the subtractor 5. Distinctive features of the source are the absolute magnitude separation signal 3 and the peak detector 4, and the input The absolute value of the signal magnitude node 3 is connected to the generator 1 of a linearly varying voltage, and the output is connected to the subtractor 5 directly and through the peak detector 4, the linearly varying voltage l is symmetric dvuhpol polar signal with equal rise and fall slope. 2 Il. cl

Description

The invention relates to a converter technique and is intended for use in control systems for autonomous voltage inverters, direct frequency converters, etc.

In a number of valve transducers, sinusoidal voltage sources are used that are adjustable in amplitude and frequency over a wide range. Circuits with a straight-step-like approximation of a signal are complex and have high quantization noise, especially with deep regulation.

Closest to the present invention is a phase-shifting device containing a source of quasi-sinuous

a voltage consisting of a generator of a linearly varying voltage, a subtractor, an analog multiplier, a diode and a source of constant voltage. A quasi-sinusoidal voltage is obtained by multiplying two linearly varying signals.

A disadvantage of this device is the lack of adjustment of the quasi-sinusoidal signal in magnitude.

The aim of the invention is to expand the functionality of the device.

The goal is achieved by the fact that the source of quasi-sinusoidal voltage, containing a generator of linearly varying voltage, the output of which

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connected to one of the inputs of the analog voltage multiplier, the other input of which is connected to the output of the subtractor, one of the inputs of which is connected to the output of a constant voltage source, equipped with an absolute magnitude separation unit, the voltage generator is designed as a balanced two-pole generator signal of equal decay and rise, and the constant voltage source is designed as a peak detector, the input of which, together with another input of the subtractor, is connected to the output of the node Selection of the absolute value of the signal whose input is connected to the generator output of a linearly varying voltage.

FIG. 1 shows a block diagram of the device; in fig. 2 - time diagrams that show his work.

The generator 1 is a linearly varying voltage associated with the analog multiplier 2 voltage and scrap 3 separates the absolute value of the signal, the output of which is through the peak detector 4 and directly connected to the inputs of the subtractor 5, the output of which is connected to the second input of the analog multiplier 2 voltages.

Timing diagrams (Fig. 2) show voltage 6 at the output of generator 1 of a linearly varying voltage, voltage 7 at the output of the absolute value of the signal magnitude 3, voltage 8 at the output of the peak detector 4, voltage 9 at the output subtractor 5, the output signal 10 at the output of the analog multiplier 2.

The principle of operation of the device is as follows.

The linearly varying voltage 6 on the analog voltage multiplier 2 is multiplied by the output voltage 9 of the subtractor 5, which is the difference of the signals shown in the diagrams

7 and 8. When selecting the transfer ratio of the subtractor 5 on the inputs in the ratio of 1 / 2.22, the voltage 10 is almost sinusoidal.

To change the frequency, it is enough to change the frequency of the voltage of the generator of the linearly varying voltage. When the amplitude of voltage 6 varies, the amplitude of output signal 10 changes, and when voltage changes 6 times K, output 10 changes K2 times because it is the result of multiplying two values that change each K times. As a consequence, the errors introduced when working with small signals are not characteristic of this device, even with deep regulation of the output voltage amplitude 10.

Three-phase sources can be implemented by applying the described three of the same type of device.

Claims (1)

The invention The source of quasi-sinusoidal voltage, containing a generator of linearly varying voltage, the output of which is connected to one of the inputs of an analog voltage multiplier, the other input of which is connected to the output of the subtractor, one of the inputs of which is connected to the output of a constant voltage source, different that, in order to extend the functionality, it is equipped with an absolute value selection unit for the signal, the generator of a linearly varying voltage is designed as a generator symmetrically a two-pole signal with equal steepness of the decay and rise, and the constant voltage source is designed as a peak detector, the input of which, together with another input of the subtractor, is connected to the output of the absolute value selection node of the signal whose input is connected to the output of the generator of linearly varying voltage . t FIG.