SU620017A1 - Code-to-phase converter - Google Patents

Description

(54) CODE-PHASE CONVERTER

The invention relates to the field of automation and measurement technology and can be used in the construction of precision angle-code converters and in electric drive control systems.

A known code-phase converter, whose operation is updated on the time delay of the signal, comprising a pulse generator, and a pulse counter.

The disadvantage of such a converter is low noise immunity.

The KOJ: H phase transducer is also known, which is built on the basis of the “pesaeal vani” principle.

This converter provides for the use of a selective circuit with steep phases (a characteristic whose departure of parameters leads to the appearance of a converter error.

The closest technical solution to this invention is a converter comprising a controlled pulse generator, two binary counters, an input device,

two functional code converters and two code-voltage converters.

The disadvantage of the "1 known converter" is the complexity of the structure of the nodes included in the converter, the number of which is pr (and the number of phases.

The aim of the invention is to increase reliability for. code-simplification converter simplification account.

A fixed antenna is achieved by the fact that, in the proposed converter, a co-phase comprising a pulse generator, the output of which is connected to the pulse counter input, the input of the first code-voltage converter is connected to one side of the pulse counter outputs, the other cat output (through the code input unit is connected to A code-voltage input to the input transducer of the converter, a sinusoidal voltage generator, two comparators and two low-pass filters are entered, and the output of the sinusoidal voltage generator is connected to the first inputs of the comparator c, the second inputs are connected to the outputs of the first to the second

code-voltage converters, respectively, and the output of a comparator cable connected to the input correspond to its low-pass filter.

The drawing shows the structural cxeN5a of the proposed converter. The code-phase converter contains a generator of 1 pulses connected to a ring counter 2 with one cross-link, the outputs of which are connected directly to the input of the first converter 3. code-voltage and through block 4 of code input to to the input of the second converter 5, the code-voltage V-soda of the converters 3 and 5 are connected to the first; the inputs of comparators 6 and 7, respectively, to the second inputs of which one generator 8 is sinusoidal with the voltage,

The outputs of Comparators 6 and 7 are connected appropriately; Sho to the inputs of filters 9 and 10 of the lowest. TOT; the outputs of the last owner: outputs of the device.

The converter operates as follows.

From the generator 1 pulse signal

enters the ring counter 2 with one cross connection with the number of bits s chosen from the required accuracy. pgg} psh./k to the harmonic law of the output signal of the converter. The frequency of the pulse generator 1, the number of bits of the counter 2 and the frequency of the output signal of the converter are related by the following relation

f tr.M. .

EXIT 2P output frequency

 |. generator frequency 1 pulse P - the number of bits of counter 2,

Signal. direct triggers of the counter 2c with one cross-connection are fed to the code-voltage converter 3, which converts the code combinations of the counter. 2 to a voltage varying with a triangular wave that goes to the first input of the comparator 6; a sinusoidal voltage from the generator 8 goes to the second input of this comparator, with f where f is the frequency of the generator 8 l sine of an ideal voltage and amplitude The signals from the pre-rammer 3 are code-nr and the generator 8 sinusoidal voltages are equal,

As a result, the pulse-modulated (UJ№V) signal is modulated from the output of the comparator 6, modulated by a sinusoidal1:) But the law has two frequencies: the frequency of the generator 8 is sinusoidal and the signal from the output of the 3 code-voltage converter, entering the lowpass filter 9, the cutoff frequency of the filter 9 is within

The output of the phylar 9 low frequency is a sinusoidal signal with a frequency and phase equal to the frequency and phase of the signal from the output of the converter 3 code voltage.

The direct and inverse outputs of all the triggers of the counter 2 are cross-connected to the input of the code input block 4. The input code arriving at block 4 of entering the code and corresponding to the required phase pairing connects the trigger outputs of counter 2 with one connection to the converter 5 codec.

Further conversion of the output signal. a code-voltage converter 5 occurs,, as previously described. As a result, a sinusoidal signal is removed from the output of the low-pass filter 10, the phase of which is proportional to the input code N, relative to the phase of the low-pass filter 9,

Comparative tests of the other code-phase converter with the known data show that the use of the invention increases the reliability of the device, and the phase shift of the two output signals does not depend on the frequency of the pulse generator, unlike the prototype.

Claims (1)

The formula invented is a code-phase converter containing a pulse generator, the output of which is connected to the input of a pulse counter, the input of the first code-voltage converter is connected to one of the outputs of the pulse counter, the other input of which is connected to the input of the second code-converter characterized in that, for the sake of reliability, a sinusoidal voltage generator, two comparators and two frequency filters were introduced, the output of the sinusoidal voltage generator being connected It is connected to the first inputs of the comparators, the second inputs of which are connected to the outputs of the first and second code-voltage converters, respectively, and the output of each comparator is connected to the input of the corresponding low-pass filter.