SU1104428A1 - Device for measuring sine-shaped voltage - Google Patents

Abstract

A DEVICE FOR MEASURING A SINUSOVAL VOLTAGE, consisting of an analog-digital converter, a recording unit, characterized in that, in order to expand its functionality by ensuring the control of control systems in a dynamic mode, as well as measuring accuracy and accuracy of measurement by eliminating spurious measurements a sinusoidal low frequency voltage (units and fractions of a hertz) and a decrease in the measurement time to a half-time value, it is equipped with an analog storage device An tracking and tracking system comprising an emitter follower connected in series, a comparator, a strobe pulse shaper, a logic unit, a pulse counter, a reversible counter with a preset, an analog storage mode control unit, and a reference frequency generator, the output of which is connected to the counting inputs of the pulse counter and a reversible counter, with the first output of the logic block connected to the inputs of the initial installation of the counters, the second output of the logic block with the input The counter counter, the outputs of the pulses counter pulses are connected to the inputs of the preset bits of the reversible counter so that the first counter of the pulse counter is connected to the zero discharge of the reversible counter, the second counter of the counter to the first discharge of the reversible counter, etc., the outputs of the reversible counter are connected to the inputs of the operating mode control unit of the analog storage device, the third output of the logic unit is connected to the input of the pulse counter, the fourth output of the logic unit is enabled The analog input of the analog storage device, whose output is connected to the control inputs of the analog-digital converter and the analog storage device, the output of the analog storage device, is connected to the input of the emitter repeater, and its output is connected to the analog input of the analog-digital converter, the output of which connected to the control input of the recording unit, the outputs of the analog-to-digital converter connected to the inputs of the registration unit. 2. The device according to claim 1, characterized in that the logic unit is made in the form of two series-connected coincidence circuits, a single pulse generator, a reversible counter and a trigger, with the output of the strobe pulse generator connected to the input of the first coincidence circuit, the power supply circuit is connected to entry form

Description

single pulse bodies, the output of which is connected to the R input of a trigger, the S input of which is connected to the output of a reversible counter, do (dg e whose inputs are connected to a common point, 3 input is open, C input is connected to the output of a single pulse former, input -1 - with the output of the strobe pulse former.

3. The device according to PP. 1 and 2, imperatively that the control unit for the operation of the analog storage device is made of three matching circuits and Tjftirger, the first inputs of the first two matching circuits connected to the outputs of the reversible counter with a preset, their second inputs are fed respectively, to the first - code tn units, on the second - code O, "the output of the first matching circuit is connected to the 5th trigger input, the second output to the C, R-trigger input, the first input of the third matching circuit is connected to the trigger output, its second input with the trigger output is logical on the block.

The invention relates to a measurement technique and can be used in automated monitoring or control systems.

A digital voltmeter with a parallel-series balancing in time is known, containing a programmable device, a decade of threshold elements, adders, a converter code - voltage, a register, and a digital reading device 1.

The disadvantage of the voltmeter is the low speed and the inability to measure at low. frequencies.

The closest to the invention to the technical essence is a digital voltmeter P-386, containing an analog-to-digital converter (ADC) consisting of an input unit, an exemplary voltage source, an input converter into a DC voltage, a reference frequency generator, a phase voltage. a detector, an interference circuit, a synchronizer, a selector, a transmission circuit, a control circuit and a counter, a registration unit consisting of a sign detection circuit, a decoder and a reading device, and one of the inputs a voltage generator duration is connected to an input unit and to another - an exemplary voltage source. To the input of the input unit through a switch is connected

DC input signal bus or through the converter of input values to DC voltage of the AC input signal. The digital block contains a phase detector, a reference frequency generator and a synchronizer, connected in a ring, to the input of the phase detector there is also an interfering noise circuit, and to the synchronizer input, a transmission circuit forming a ring, a synchronizer output connected to the selector and a sign determining circuit, a selector , scheme for determining the sign, reading device, deuifra-. The torus counter, the control circuit, and the transmission circuit also form a ring; in addition, the output of the selector is connected to the transmission circuit, and the output of the transmission circuit is connected to the input of the counter. The converter is energized using a transformer with a synchronizer, and with a second transformer with a digital unit selector 2.

A disadvantage of the known device is the low speed, due to the presence at the output of the amplifier-vypir mitel filter with a sufficiently large constant time.

The purpose of the invention is to enhance the functionality by allowing control systems to be dynamically monitored, as well as increasing measurement accuracy and accuracy by eliminating spurious low-frequency sinusoidal voltage measurements (units and hertz) and reducing the measurement time to a half-time value of 5.

This goal is achieved by the fact that a device for measuring a sinusoidal voltage, consisting of an analog-digital converter 10 and a recording unit, is equipped with an analog storage device (AMS) and a tracking system containing series-connected emitter follower, comparator, and s "tel strobe pulses, logic block, pulse counter, reversible counter with preset, control unit of the analog storage mode and generator of the reference 20 frequency, the output of which is It is connected to the counting inputs of a pulse counter and a reversible counter, the first output of the logic unit is connected to the inputs of the initial installation of the counters, the second output of the logic unit to the input of the reversing counter, the outputs of the bits of the pulse counter are connected to the inputs of the bits of the preset reversible counter in this way that the first discharge of the pulse counter is connected to a zero discharge to the reversible counter, the second discharge of the counter to the first discharge of a reversible counter, etc., the outputs of the reversible counter are connected the inputs of the control unit of the analog mode memory device is of the third logic unit output is connected to the pulse counter input chetvertm output - to the mode control unit permitting the entrance of the analog memory device whose output is connected with the control inputs of the analog-digital transformation. the generator and the analog storage device, the analog storage device input is connected to the emitter follower input, and its output is connected to the analog input of the analog-digital converter, the output of which is connected to the control input of the recording unit, the outputs of the analog-digital converter are connected to the inputs of the registration unit . In this case, the logic unit is made in the form of two series-connected coincidence circuits, the driver

single pulse, reversible counter and trigger, with the output of the strobe pulse generator connected to the input of the first coincidence circuit, the power supply circuit is connected to the input of the single pulse generator, the output of which is connected to the R input of the trigger, the 5 input of which is connected to the output of the reverse counter, do, 2, which are connected to a common point, di-input is open, C-input is connected to the output of a single pulse former, input -1 to the output of the gate strobe pulse.

In addition, the control unit of the operating mode of the analog storage device is made of three matching circuits and a trigger, the first inputs of the first two matching circuits connected to the outputs of the reversible counter with a preset, the second inputs are fed to the first one - the code fn units, to the second 1 code O , the output of the first coincidence circuit is connected by a c5 input of a trigger, the output of BTopofi is a cR input of a trigger, the first input of the third coincidence circuit is connected to the output of a trigger, its second input is connected to the trigger output of a logic unit. Fig. 1 is a general diagram of a device for measuring a sinusoidal voltage; figure 2 - logical block; FIG. 3 shows an analog memory storage unit control unit; figure 4 is a sequence diagram of the operation of the device. The device (FIG. 1) contains an emitter follower 1, the input of which and the input of the AMC are combined and are the input of the device, the output of the emitter follower 1 is connected to the serially connected comparator 2, the strobe 3 shaper and the logic unit 4, one output logic unit 4 is connected to the input of the pulse counter 5, the second to the inputs of the pulse counter 5 and the reversing counter 6 with a preset, the third to the input of a reversible counter to the preset, and the fourth to the input of the unit 7 for controlling the mode of operation. The outputs of the pulse counter 5 are connected to the inputs of the reversible counter 6 with a preset, and the outputs of the latter are connected to the inputs of the block 7 for controlling the mode of the ACU, the output of which 51104 is connected to the inputs of the AMU 8 and the ADC 9. The inputs of the pulse counter 5 and the reversible counter 6 are preset connected to generator output 10 reference frequency. The output of the analog 5 of the storage device 8 is connected to the input of the ADC 9, the outputs of which are connected to the inputs of the registration unit 11, and one of the inputs of the ADC 9 is additionally connected to the input of the registration unit 11. . The logic block (Fig. 2) contains successively connected matching circuits 12 and 13, the input of matching circuit 12 and input -1 of the reversing counter 14 with the preset are combined and are one of its outputs, the output of matching circuit 13 is the second output of the block, logical the block also contains a single pulse shaper 15, whose input is the block input, and the output is the third block output and is also connected to the inputs of the reversible counter 14 with a preset and the trigger 16 CJQ inputs, (2 reversible counter 14 with a preset are connected to The common bus, input d is free, and the output is connected to the second input of flip-flop 16, the output of which is the fourth output of the block. The control unit for the ACD operation mode (Fig. 3) contains two matching circuits 17, some of which are inputs (Combined and are inputs the remaining inputs are also combined and connected to a common bus to form the code and O code. The outputs of the matching circuit 17 are connected to the inputs of the trigger 18, the output of which is connected to the input of the matching circuit 19, the other input of which is the second input of the block and the output block output. The device works as follows. A measured sinusoidal voltage arrives at the input of the device, then it splits and enters the input of the AMC 8 and the input of the emitter follower 1 of the tracking system. In tracking mode, the output voltage of the analog storage device 8 repeats the input voltage until the command to store information is stored, when you remember the potential at that point in the curve where the Storage or Memory command found it. 8 From the emitter follower code that plays the role of a decoupling signal, the signal is sent to a comparator, where it is converted to square, the pulses of the same frequency (Ugbix.KOMn) are further along the front and rear edges of the same pulses using the strobe pulse generator, the signals and and 8bix.opop / v .stra.imp. which are fed to the input of the logic unit 4. The logic unit 4 controls the operation of the pulse counter 5, the reversible counter 6 and the unit 7 for controlling the behavior of the AMS. Pulse counter 5 records a certain number of pulses — from the generator 10 of the reference voltage per time, between the front fronts of two successive strobe pulses, and when a pulse arrives, information is copied to the reversible counter and then through line 12-13 delays, resetting the information of counter 5, after which counter 5 again starts counting pulses. Information is written to the reversible counter 6 from counter 5 and is shifted by one bit, i.e. In the reversible counter 6, half the pulses are recorded than in counter 6. Immediately after the preset has been written to the reversing counter 6, the counting begins, and after zeroing the information, a reverse signal appears in the counter, the counter arrives at block 7 control mode of the AMS 8, from the output of which a command is issued simultaneously to record information in the AMS 8 and to start measuring using the ADC 9. When the measurement is completed, the signal to register the measurement result is supplied from the ADC. When the device is turned on (the turn-on circuit is not shown in Fig. 1), the initial enable reset signal 16 of the ABC is set to O, and the code 2 from the 1 2 inputs is written to the start counter 14 (executed on the reversing counter microcircuit). his c-input. After the counter 14 of the second strobe pulse arrives at input -1 after switching on the device at output O, a signal is generated that the trigger 16 is set to the working position. The trigger 16 remains in this position until the device is turned off 7. This provides protection against spurious measurements and is based on the fact that the first pulse after switching on the device is passed, and the measurement starts from the second. The device can be turned on at any time, the instantaneous values of the sine wave change, and since the device has an amplifier and a comparator, then at the moment of switching on, there will be an almost instantaneous increase in the signal at the comparator output, which will cause a pulse at the shaper output. Therefore, measurements are made on the second pulse. In addition, the logic block provides for a delay in the time of the census of the counter data in the presetting device of the reversible counter, after which a reset occurs to start a new cycle. All this makes it possible to increase the reliability and accuracy of measurement due to the exclusion of random factors. In the control unit of the ABC mode of operation (Fig. 3) there are two digital comparators (coincidence circuit 17), one of which is set to m pulses, the other to 0. The first comparato m blocks before the measurement translates the ABC mode control unit 7 from storage is in tracking mode, and when the second comparator is triggered, the ABC goes into storage mode, from this point on, measurements are made. The passage of the control signal to the CAM is vented by the coincidence circuit 19 of the CAM operation signal from the trigger 16. The number m is selected depending on the reference frequency so that the passage time 28 m not enough pulses is enough for the CAM to go from storage to tracking mode so that After setting the tracking mode, go back to the storage mode. For real CAMs, it is estimated at 5 µs. This provides for an increase in the reliability of the measurement results, since the logic of the device operation makes it possible to avoid random measurements when the previous voltage value, is stored. The signal taken from the output of the AMS (Ug (, (zu)) is shown in Fig. 4. The device measures the amplitude of the input signal at the time of the half period, and with an accuracy of fractions of a degree, depending on the frequency of the measured voltage. 10 ms of information with a decrease in potential of only 0.1%. This time is sufficient for several ADC measurements. In addition, the device allows to measure voltages with a frequency up to fractions of a hertz, since there are no elements depending on the frequency in it. At the same time, the measurement time does not exceed after the first measurement. Thus, the proposed device allows the operation of automatic tracking systems that use sensors operating on alternating current, and also makes it possible to monitor the tracking systems in a dynamic mode, allowing a sinusoidal voltage of low frequency to be measured time equal to the half-period of the frequency of the measured signal. JL JL

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Claims (3)

1. DEVICE FOR MEASURING SINUSOIDAL VOLTAGE, consisting of an analog-to-digital converter, recording unit, characterized in that, in order to expand its functionality by providing control systems in dynamic mode, as well as increase the reliability and accuracy of measurement by eliminating false measuring a low frequency sinusoidal voltage (units and fractions of a hertz) and reducing the measurement time to a half-time value, it is equipped with analog storage devices ohm and a tracking system containing a serially connected emitter repeater, a comparator, a strobe driver, a logic unit, a pulse counter, a reversible counter with a preset, an analog storage device operating mode control unit and a reference frequency generator, the output of which is connected to the counting inputs of the pulse counter and a reverse counter, with the first output of the logic block connected to the inputs of the initial installation of counters, the second output of the logical block with the input of the reverse counter the output of the bits of the pulse counter is connected to the inputs of the bits of the preset of the reverse counter so that the first bit of the pulse counter is connected to the zero bit of the reverse counter, the second bit of the counter to the first bit of the reverse counter, etc., the outputs of the reverse counter are connected to the inputs of the block control mode of operation of the analog storage device, the third output of the logical unit is connected to the input of the pulse counter, the fourth output of the logical unit is with the enable input of the control unit the operating mode of the analog storage device, the output of which is connected to the control inputs of the analog-to-digital converter and the analog storage device, the output of the analog storage device is connected to the input of the emitter follower, and its output is connected to the analog input of the analog-to-digital converter, the output of which is connected to the control input the registration unit, the outputs of the analog-to-digital converter are connected to the inputs of the registration unit. 2. The device according to π. 1, characterized in that the logic unit is made in the form of two series-connected coincidence circuits, a single pulse shaper, a reverse counter and a trigger, with the output of the strobe pulse shaper connected to the input of the first matching circuit, the power-on circuit connected to the input of the single> 1104428 single pulse whose output is connected to the R-input of the trigger, the S-input of which is connected to the output of the reverse counter, do »d2 the inputs of which are connected to a common point, the input is open, the C-input is connected to the output of the roving · a single pulse, input -1 - with the output of the driver of the strobe pulses. 3. The device according to paragraphs. 1 and 2, characterized in that the control unit of the operating mode of the analog storage device is made up of three coincidence circuits and a Tjftirger, with the first inputs of the first two coincidence circuits connected to the outputs of the reversing counter with a preset, their second inputs are fed respectively to the first - code of m units, on the second - code 0, 'the output of the first match circuit is connected to the 5th input of the trigger, the output of the second one is with the R-input of the trigger, the first input of the third match circuit is connected to the output of the trigger, its second input with the trigger output of the logic block .