SU1649502A1 - Frequency converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in systems for automatically controlling the frequency of alternating voltage of autonomous systems. The aim of the invention is to increase the conversion speed by providing a predetermined time quantization. The frequency converter converts analog harmonic signals with a frequency of up to a pulse train with a frequency of OSLO SED where K is q / v is the number of quantizations; c - quantization step. 1 il.

Description

The invention relates to electrical engineering and can be used in the systems of automatic control of the frequency of alternating voltage of autonomous power systems.

The aim of the invention is to increase the conversion speeds by providing a predetermined time quantization.

The drawing shows a block diagram of the frequency converter.

The frequency converter contains the first 1 and second 2 multiplication blocks, the first 3 and second 4 functional converters, the adder 5, the zero-organ 6 and the ring counter 7.

The device works as follows.

The inputs of the device are input signals of the form

Uext Umaks Sin Q) t, Uex2 UMaiccSln (COt + p),

where tp is the phase shift, for example, p - 120 °. Functional converters 3 and 4 implement the following functions:

sin I in

sin p U4 HWc (cos I 0- ctg p sin i in),

where is the quantization step; , 2 ... K

K - number of quantizations, K

U3 and LM are respectively outputs of functional converters 3 and 4.

As a result of multiplying the input signals by the output signals of the function

oh

01

about

Yu

Inverter converters 3 and 4, the output signals of blocks of multiplication 1 and 2 at time ti are

Ul - Uuxi U4 U4 Umaks Sin Ultl, U2 Uex2 U3 U3 Umaks Sin (M ti + p)

When adding these signals in the adder b we get:

Us - imax sin (a) ti + b)

The resulting sinusoidal voltage is fed to the input of the null organ 6, which forms a short pulse at the moment this voltage passes through zero. This pulse changes the number at the output of the ring counter 7, which is the address of the following values Uz and 1M. From the output of functional converters 4 and 3, the inputs of multiplication blocks 1 and 2 receive new values of U and III, respectively, the voltage changes at the output of adder 5. At the output of adder 5, at time t2,

U3t2 imax sln (° 2 + 2 in)

Further, the operation of the device is similar. When reaching the angle of shear

K 0 (where K p) the ring counter is zeroed and the calculation cycle is repeated,

0

five

0

five

0

Thus, the output of the frequency converter receives a sequence of pulses with a frequency equal to Kw.

The frequency converter provides high speed frequency conversion of the harmonic signal into a sequence of pulses.

Claims (1)

The claims of the frequency converter containing a null organ, characterized in that, in order to increase the conversion speed, it contains the first and second multiplication units, an adder, a ring counter, the first and second functional converters, and the output of the zero organ that is the output of the converter , connected to the input of a ring counter, the output of which is connected to the inputs of the first and second functional converters, the outputs of which are connected respectively to the first inputs of the first and second blocks a lot nor, the second inputs of which are respectively the first and second inputs of the converter, the outputs of the first and second multiplication units are connected respectively to the first and second inputs of the adder, the output of which is connected to the inputs of the zero-body OHL