SU739608A1 - Shaft angle-to-frequency converter - Google Patents

Description

(54) SHAFT ANGLE CONVERTER The proposed device relates to the field of telemetry and is intended for direct / venvoy transformed angle of rotation of the shaft in the frequency of following the pulse in equipment with high precision parameters. Conversion devices are known. angle of rotation of the shaft into the frequency in which the sensors are powered from an unstabilized network. They are constructed with intermediate formation in the code of either phase or amplitude parameters of the sensor. In the latter case, in the ifjeaycMOTpeHa devices, the compensation of the effect of voltage instability is l. The closest to a shielded device by its technical nature is a device containing a tsleplova, tel connected shaft angle sensor, input switch, a five-way divider (1). AC generator to binary code, codefrequency converter and resistor, connected to the clock FREQUENCY VALVE with sensor and connected to the second input of CMB of the input signals. The operation is coordinated by the control device 2. The conversion takes place in two cycles. In the first cycle, the fall is converted to the code. the voltage across the resistor, the coefficient of the flow rate of the DDT is then equal to one. The resulting code is recorded in the DDN register, whose transmission coefficient after the first clock cycle becomes unequal to one. In the second cycle, the signal from the angle sensor is converted into code. The code of the record obtained in the second clock & t is entered into the input register of the code – frequency converter and is converted into a pulse frequency. At the end of the conversion cycle, the PDD register is cleared, and for this, the first conversion cycle is repeated — the compensation cycle of the effect of the voltage grid instability. This device has two major drawbacks: an unreasonably large amount

equipment and low speed. These shortcomings are due to the fact that the double transducer is essentially fi rst — first into the code, then the code into the pulse frequency. The second drawback is also due to the fact that the conversion is performed sequentially in two cycles,

11 of the proposed invention, improving the speed and hardening of the converter.

The essence of the proposal is that the transformation of the angle of rotation of the sensor shaft occurs directly (without intermediate conversion) and continuously.

This is achieved by introducing a voltage to frequency converter in the shaft angle-to-frequency converter, the shaft angle sensor output is connected to the first input of a discrete voltage divider, the output of which is connected to the voltage-to-frequency converter input, the voltage source output is connected input voltage converter code; the output of which is connected to the second input of the discrete voltage divider. .

The drawing shows the functional diagram of the proposed Converter

The shaft angle-to-frequency angle converter contains a shaft angle sensor 1 connected in series, a discrete voltage divider 2 (on the analog input), a voltage-to-frequency converter 3, and a voltage converter 4 to the code whose output is connected to the digital input of the digital voltage divider 2 and the input is with the input of the sensor 1 of the angle of the huvorot shaft. Sensor 1 is connected to voltage source 5.

The output voltage of the sensor 1, which is proportional to the angle of rotation of its shaft, is generated in the following frequency. pulses by the transducer 3. At the same time, the output voltage of the sensor is influenced by fluctuations in the voltage of the generator, from which the sensor is energized. To compensate for this effect on the output frequency of the device, the voltage of the network in converter 4 is converted into code, inversely proportional to which the division factor of the output voltage of sensor 1 in divider 2 changes. Thus, when the voltage of the network changes, the division factor changes inversely network voltage, and since

73D608

the dividend load varies in direct proportion to the voltage variation of the network, and the influence of the instability of the network voltage on the output frequency of the converter is compensated.

Papr same 1 at the output of the sensor 1 equals .U V - where f. - CoE ({1 sensor transfer 1;

(X. - the angle of rotation of the input shaft

sensor.

The voltage at the output of the divider 2 voltage is

where K. is a coef (tlShant dividing divider 2, for example. Frequency at the output of converter 3 is equal to

Chj ,,

where K, is the transmission coefficient of the converter 3.

The division ratio of the divider 2 voltage is determined by the expression

where X is the code value on the digital input of the voltage divider 2. Since the digital input of divider 2 is connected to the output of converter 4, and the input of this converter is connected to sensor input 1, the code value on the digital input of voltage divider 2

,

where K is the transfer coefficient of the converter 4.

Thus, the frequency of the output pulses will be determined by the expression:

,

4w, - to

As can be seen from the last expression, the pulse frequency of the output pulses is proportional to only one variable path of rotation of the shaft of sensor 1 and does not depend on the voltage of the network from which this sensor is excited. The conversion occurs continuously, the high frequency monitors the angle change: (The code on the field input of the voltage divider 2 is updated with a frequency equal to the speed of the converter 4.

Claims (2)

The proposed device, the gri implementation on the same elemental base as the known device, has a speed of 1 x at least twice as high, since the change in the frequency of the pulse of pulses at its output occurs ite interrupt. In addition, the refresh time of 573 cops on the 1-DIGITAL input of the discrete voltage dividers in the proposed device is two times less than in the known volume of the equipment of the described device is less than known, since it does not have an input switch and a common control device. The voltage to voltage converter is transferred from the main channel to the compensation channel, which reduces its requirements and yHJOCTKTb its circuitry. The load-to-frequency converter is more generous than its code-frequency converter and does not contain a bulky quartz resonator. Consequently, the amount of equipment in the previous device, as compared with the known device, is reduced approximately by a factor of two. The invention The converter of the angle of rotation of the shaft into the frequency, containing the source of the same 08, the output of which is connected to the input of the sensor of the angle of rotation of the shaft, a discrete load divider, a voltage converter in the code, which is different because of the speed and simpler ø conversion, a heating heater is introduced into the frequency, the output of the shaft angle sensor is connected to the first input of the discrete voltage divider, the output of which is connected to the input of the voltage generator to the frequency, the output is chnika natf voltage converter connected to the input voltage to the code whose output is connected to the second input of the discrete voltage divider. Sources of information taken into account in the examination 1. UK Patent No. 1352529, cl. G 4 And 1975 2. USSR author's certificate number 195206, cl. G 06 F 14 / 00,30.04.66 (grototype).