SU1578808A1 - Converter of sine-cosine rotating transformer voltage to binary code - Google Patents

Abstract

The invention relates to automation and computing and can be used in input-output devices of digital computers. The aim of the invention is to improve the accuracy of the conversion by forming a low-order octant code by comparing the results of the simultaneous conversion of the direct and inverse ratios of the sine and cosine voltages. The goal is achieved due to the fact that the converter containing the source of sine-cosine voltages, two precision devices, a quadrant determinant, an amplifier-inverter with large-scale resistors, a device for network and automatic synchronization and starting of the converter, two analog-digital converters are entered second amplifier-inverter and digital comparator and multiplexer. The introduction of new blocks with the appropriate connections allows one to more reliably determine the lower bit of the octant code by comparing the results of simultaneous coding on the analog-to-digital converters of the voltage ratio to the code. 1 il.

Description

The invention relates to automation and computing and can be used in input-output devices of digital computers.

The purpose of the invention is to improve the accuracy of conversion by firing the low-order octant code according to the results of the simultaneous coding of the direct and inverse relations of the sinus and cosine voltage of the sinus-cosine rotary transformer

The drawing shows a block diagram of a converter. The converter contains a source of 1 sine-cosine voltage, a device 2 and 3 of exact rectification, a determinant of the 4th quadrant, analog-digital converters 5 and 6, the first amplifier-inverter, made of amplifier 7 and resistors 8 and 9 , the second amplifier-inverter, made of usi amplifier 10 and resistors 11 and 12, digital comparator 13, digital-to-digital multiplexer 14, automatic synchronization device 15, network synchronization device 16, converter starting device 17 l „

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Devices 2 and 3 of the exact rectifier contain operational amplifiers. 18 and 19, resistors 20-22, diodes 23-26. Each of the analog-to-digital converters 5 and 6 contains an input resistor 27s digital-to-analog converter 28, a sequential approximation register 29 and a comparator 30 and has the first 31, the second 32, the third 33 inputs and digital output 34, Analog-to-digital converter 6 likewise has inputs 35-37 and digital output 38. The quadrant identifier has outputs 39 and 40 corresponding to the two most significant octant digits, Output 41 of the digital comparator 13 is the output of the younger bit octanta digital multiplexer 14 has digital octave code output 42 which is the output of the transducer.

The converter works as follows.

way

The input sinus U5 cosine Uc voltage comes from the source

1 to the inputs of devices 2 and 3 of the exact straightening, the inputs of the determinant of 4 quadrants and the device 15 automatic synchronization On devices

2 and 3 a precision full-wave rectification of sinus and cosine voltages is performed separately, the transient sinus voltage is fed to the first input 31 of the converter 55 the rectified cosine voltage to the first input 35 of the converter 6 o the first amplifier-inverter, from which, on the scale of the ratio of resistors 8 and 9, is applied to the third input 37 of the converter 6, the rectified cosine voltage is fed to the second amplifier, the inverter, from which The ratios of the resistors 12 and 11 are fed to the third input 33 of the converter 59 In addition to the devices 2 and 3 of the exact rectifier, the sinus is Ug. and cosine Uc voltages are applied to the determinant of 4 quadrants and to the device 15 automatic synchronization. At the comparator, the determinant of 4 quadrants, depending on the phases of the sine and cosine voltages, produces the values of ne of the first (2) and second (21) octant bits at the outputs 39 and 40 "On the device 15 automatic synchronization

at the moment of transition of the sum modulo sinus and cosine stresses through

| zero is the generation of an automatic synchronization signal. The formation of this signal over time is due to the presence of phase shifts of the voltages U5 and Uc relative to the network. Its use for starting converters 5 and 6 provides synchronization with specific voltages Ug and Uc with existing phase shifts Signals from devices 15 and 16 of automatic synchronization and network the synchronization is sent to the converter start-up device 17 in which a start-up pulse is generated, which is fed to the second inputs 32 and 36 of both converters 5 and 6. After the start, the converters 5 and 6 are executed discharge balancing In this case, the voltage ratio US / UC5 is encoded on the converter 5 in accordance with the applied voltages, and the voltage ratio UC / U on the converter 6, the Direct U5 / UC ratio as a value less than one is realized in the 1st ( 0-45 °), 4th (135-180 °), 5th (180-225 °) and 8th (315-360 °) octants In the remaining 2nd (45-90 °), 3- It’s (90-135 °), 6th (225-270 °) and 7th (270-315 °) octants is a ratio greater than one, which indicates (Vs) (Uc). At the same time, converter 5 continuously produces maximum code, inverse ratio UC / U as a value less than one unit is contained in the 2nd, 3rd, 6th, and 7th octants In the remaining 1st, 4th, 5th, and 8th octants, this ratio is greater than one, indicating (U.) (1O " Wherein

C, 3

Converter 6 continuously generates the maximum code. Comparison of converter codes received via buses 33 and 38 is performed on a digital comparator 13, which, as input voltages U and III change, output of the third (2) octant is varied. The matching code of one of the converters with the constant code of the other converter, besides getting the third bit, allows you to switch the digital multiplexer 14 by its start to form the current variable value at the output 42 code, regardless of which of the converters is obtained on it. Thus, the total value of the transformed code is composed of three octant bits, formed on

exits 39-41 and the intra-octant code generated at the output 42 |

Claims (1)

The proposed converter provides the formation of the third bit of the octant code in a digital way when comparing the results of coding on two converters. Since the converters perform the coding of the direct and inverse relations of sine and cosine voltages within each octant, thereby increasing the reliability of the formation of the third bit Octant Formula A sine-cosine rotary transformer voltage converter into a binary code containing the first and second precision devices, the outputs of which are connected to the first inputs of the first and second analog-digital converters, the quadrant determinant, the first and second inputs of which are connected to the first and second the inputs of the automatic synchronization device, respectively, the output of which is connected to the first input of the converter starting device, the second input of which is connected to the output of the network device synchronization, and the output is connected to the second inputs of the first and second analog-to-digital converters, the input of the network synchronization device is connected to the mains, the first amplifier-inverter, which differs five 0 five 0 five so that, in order to increase the accuracy of the conversion by forming a low-order octant code as a result of the simultaneous coding of the direct and reverse sine and cosine voltages, a second amplifier-inverter, digital comparator and multiplexer are introduced into it, Milli through the first amplifier-inverter is connected to the third input of the second analog-to-digital converter, the output of the second precision rectifier through the second amplifier-inverter is connected to tert To the input of the first analog-to-digital converter, the code outputs of the first and second analog-digital converters are connected to the first and second code inputs of the digital comparator and multiplexer, respectively, the output of the digital comparator is connected to the control input of the digital multiplexer and is an output of the octant lower-order, the inputs The first and second precision rectifiers are connected to a sine and cosine BbixonfiM sine-cosine rotating transformer and are connected to the first and second inputs The quadrant determinants, whose outputs are the outputs of the higher octant bits, the digital outputs of the digital multiplexer are the code outputs in the octant range. four From MBT sensor. from the network Sornn NO 02 F