SU1305847A1 - Shaft turn angle-to-digital converter - Google Patents

Abstract

The invention relates to automation and computing, in particular, to devices for converting the angle of rotation of the shaft into a code, and is intended to connect analog information sources with digital computing devices. In order to improve the accuracy of the converter of the angle of rotation of the shaft into the code by eliminating the effect of the phase shift between the input and output voltages of the sine-cosine rotating transformer (SCWT), the converter contains SCBT 1, phase shifting element 2, adder 3, shaper 4 stop-pulse, the first trigger 5, element 6, pulse generator 7, counter 8, start pulse shaper 9, the last one containing pulse shaper 10, comparator 11, null comparators 12 and 13, differentiating element 14, rectifiers 15 16, an inverter 17, a second flip-flop 18, 2I-OR element 19. By forming the start-imrulsa via the start pulse shaper, at the moments when the carrier SKBT output signal O is achieved through the following goal 1 yl. (L with: 00 about eaten OD AI-si

Description

113

The invention relates to automation and computing, in particular, to devices for converting the angle of rotation of the shaft into a code, and is intended to connect analog information sources with digital computing devices.

The purpose of the invention is to increase the accuracy of the shaft angle-to-code converter by eliminating the influence of the phase shift between the input and output and voltage of the sine-cosine V15 latching transformer

The drawing shows the function. The converter circuit.

The converter contains SCRT 1, a phase-shifting element 2, an adder 3, a stop pulse shaper A, a pearl trigger 5, an And 6 element, a pulse generator 7, a counter 8, a start-pulse shaper 9.

The start-up driver 9 contains a pulse former 10, a comparator 11, null comparators 12 and 13, a differentiating element H, rectifiers 15 and 16, an inverter 17, a second trigger 18, element 2 AND-OR19

The Converter operates as follows.

The power supply voltage of the SCRT is fed to one input of the starTuner 9, in which the driver 10 and the differentiating element 1A form a short pulse when the sensor supply voltage drops from zero to half a positive wave, which sets logical output 1 at the output of trigger 18 ACS 1 is fed to the other inputs of the imaging unit 9, where rectifiers 15 and 16 are fed to the inputs of the comparator 11. Zero comparators 12 and 13 form short pulses at the transition H; Zero output voltages Occupancy both from the negative to the positive half-wave, and from the positive to the negative half-wave. If the two output voltages of the SCRT are greater than the first, then logical 1 is set at the output of the comparator 11, and logical O is set at the output of the inverter 17. 2 AND-OR 19 passes the pulse from the output of the first null comparator 12, and the pulse from the output of the second null comparator 13 to the output of the element 2 AND-OR 19 does not pass. If the second output voltage of the sensor is greater than the first, then at the output of the computer

0

A rator 11 is set to a logic o and a pulse from the output of the second null comparator 13 passes to the output of element 19.

Thus, the output of element 19 always passes a pulse generated when a larger of the two output voltages of SCPT 1 passes through a zero, which eliminates the appearance of a false pulse at the output of logic element 19 when one of the output voltages of SCPT decreases to zero.

The pulse from the output of element 19 sets the trigger 18 to the zero state and prohibits the appearance of pulses at the output of element 19 until the trigger 18 is again set to one. Thus, at the output of the start-pulse shaper 9, during the period of the sensor supply voltage, one pulse is formed, which is shifted relative to the voltage phase of the power supply by an amount equal to the phase angle between the input voltage of the sensor and its output voltage mi The pulse from the output of the imaging unit 9 zeroes the counter 8, transfers the trigger 5 to the unit state and permits the passage of the reference-frequency pulse from the generator 7 through the AND 6 element to the counter 8. Using the phase-shifting element 2, the adder 3 and the fbirometer 4 stop5 pulses At the first input of the trigger 5, a pulse is formed, which is shifted relative to the pulse from the output of the start-pulse generator 9 to the time, which is proportional to the angle of rotation of the rotor SCWT. The impulse of the driver of 4 stop pulses, which enters the input of the trigger 5, transfers it to the zero state and closes the element 6, prohibiting the arrival of pulses from

5 generator 7 at counter 8.

Thus, the proposed device eliminates the phase error introduced by the sensor, which improves the accuracy of converting the angle to the code in comparison with the known device.

Claims (1)

Invention Formula The converter of the angle of rotation of the shaft into a code containing a sine-cosine rotating transformer, the first output of which is connected to one through a phase-shifting element 0 0 five the adder's input, another input is connected to the second output of the sine-cosine rotating axis of the transformer, and the output through the stop pulse former is connected to one input of the first trigger, the output of which is connected to one input of the And element, the other input to which is connected to the output of the pulse generator and the output is connected to the counting input of the counter, the input of the sine-cosine rotating transformer is connected to the first input of the start-pulse generator, the output of which is connected to another input of the first trigger and the input of the HON device The KI of the counter, characterized in that, in order to increase the accuracy of the converter, in it the start-pulse shaper is implemented on the pulse shaper, / 1 differentiator element, two rectifiers of two null comparators, comparator, inverter, second trigger, and element AND-OR 2, the input of the pulse former is the first input of the start-pulse former, and the output through the differentiating element is connected Editor G. Gerber Compiled by M.Sidorova Tehred A. Kravchuk Proofreader E. Roshko Order 1465/55 Circulation 902 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 It is connected to one input of the second trigger, the output of which is connected to the first inputs of the input groups of the AND-OR 2 element, whose output is the output of the start-pulse generator and connected to the other input of the second trigger, the first rectifier input is connected to the input of the first zero the comparator is the second input of the start-pulse generator and connected to the first output of the sine-cosine Rotating transformer, the input of the second rectifier is connected to the input of the second zero-comparator, is the third input of the start-pulse generator and Connected to the second output of a sine-cosine rotating transformer, the outputs of the first and second null comparators are connected to the second inputs of the first and second groups of inputs of the I-PCHI 2, respectively, the outputs of the first and second drivers are connected to the inputs of the comparator, the output of which is connected to the third input the first group of inputs of the element AND-OR 2 and across the inverter through the third input of the second group of inputs of the element I-IL 2.