SU760125A1 - Sine-cosine converter - Google Patents

Description

The invention relates to the field of analog computing technology and can be used to obtain the sine and cosine functions of the argument given by voltage and ^e varying within four quadrants.

A sine-cosine converter is known, in which blocks are used that approximate given functions implemented on operational amplifiers "with a nonlinear element?" In the negative connection circuits [1].

Its disadvantage is that | 5 the permissible range of change of the input signal is determined by the functional block itself, and for extending the range, for example, to four quadrants, a corresponding 20 complication of nonlinear circuits is required.

The closest to the technical entity is a functional (in particular, trigonometric) converter containing a functional block with memory elements connected to it [2].

Its disadvantage is also

in a limited range of variation- 39

2

input signal not exceeding the range of the function block.

The aim of the invention is to expand the range of convertible values.

The goal is achieved by the fact that the sine-sinus transducer / containing- ’| quadruplent '! cosine unit two reference voltage sources and two analogue memory elements, the input of the first of which is connected to the two-quadrant output [cosine unit, additionally 'contains the first and second half-wave rectifiers, three switches, a pulse generator and an inverter connected between the output: the two-quadrant cosine unit and entering the second element of the analog memory, with the first inputs,! a two-quadrant * co-sinus block of a single-pole-rectifier is connected to the converter input, the output of the first reference voltage source through the first switch is connected to the second input of the first half-wave rectifier whose output ^ is connected to the third input of the two-quadrant cosine; unit, the output of the second reference source, the voltage is connected to the second 'input

3 760125

four

a second half-wave rectifier, the output of which is connected through a third switch s.chetvertym dvukvadrantnogo cosine input unit The direct my impulsovpodklyuchen generator output to the control input of the second analog memory element and invariant ³

The correct output is to the control inputs of the keys and the first element of the analog memory.

The drawing shows a block diagram of the Converter. :

The converter contains a two-quadrant cosine block 1, half-wave rectifiers 2 and 3, keys 4 6, sources 7 and 8 of the reference voltage, inverter 9, elements 10 and 11 15

analog memory.

The Converter operates as follows.

Block 1 implements the cosine function in the input voltage range, 20 corresponding! X = 0 - 180 angles.

! Rectifier 2 implements the function

11, GO, with! > 0 ^and 2'1-24, <0

Rectifier 3 implements the function ι, [-2 (4, - 90 °), “C> 90 ° ^and C'10, ° C <90 °

During the odd ^ half-cycles of operation, the keys.4 are open, and block 1 generates the cosine value of the input signal, which is monitored and memorized by element 11. Moreover, if the input signal is negative, the symmetry of the transformation ensures

is due to the bias voltage coming from the output of the rectifier 2.

During even half-clocks, keys 4-6 are closed. In this case, the characteristic of unit 1 is shifted by - 90 ° by connecting source 7 through key 5. In addition, by offsetting the characteristics of rectifier 2 (due to the closure of key 6) and connecting 'rectifier 3 through key 4, a sinus dependence for angles of 270 ° is achieved <"C 4 -90 ° and 90 ° 4 <270.

After inverting, the sine function is monitored and remembered by element 10. ’

Technical and economic effect of the application of the invention due to

40

45

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saving equipment required for the implementation of functional dependence in a given wide range of variation of the argument.

Claims (1)

Claim A sine-to-sinus converter containing a two-quadrant cosine block, two reference voltage sources and two analog memory elements, the first input of which is connected to the output of a two ^- quadrant cosine / block, characterized in that in order to expand the range of convertible quantities, the converter additionally contains the first and second single-pole periodic rectifiers, three keys, a pulse generator and an inverter connected between the output of a two-quadrant cosine block and the input of the second analog memory element, p In this case, the first inputs of a two-quadrant cosine block and one-half-wave rectifiers are connected to the converter input, the output of the first reference voltage source is connected via the first switch to the second input of the two-quadrant cosine block, and through the second switch to the second input of the first half-wave rectifier whose output is connected to the third input 'two-quadrant.' cosine unit, the output of the second reference voltage source is connected to the second input of the second half-wave rectifier, the output of which is connected via the third key to the fourth input of the two-quadrant cosine unit, the direct output of the pulse generator is connected to the control input of the second element of the analog memory, and the inverse output to the control inputs of the keys and the first element of analog memory.