SU1205039A1 - Quick-acting current component transducer - Google Patents

Description

Forces the second input of the meter, the digital output of the ADC forms the second output meter, the analog output of the ADC is the fourth output of the meter.

3. The sensor PP. 1 and Zj are about the fact that the sign maker is made in the form of a sign impulse generator, whose input forms the first input of the sign maker, and the output is connected to the input of the fifth detector and the sixth detector; which through the third analog inverter is connected to the first input of the first element I, you-: the stroke of the fifth detector is connected to the first input of the second element I, the second inputs of the first and second elements I are combined and form the second input of the sign maker, and the outputs are connected respectively to the installation input in О and to the installation input in 1 intermediate sign trigger, the direct output of which is connected to the first input of the third element AND, and the inverse output to the first input of the fourth element AND the second inputs of the third and fourth elements AND are combined and form the third input of the signifier, the outputs connected respectively to the input of the installation in 1 and to the input of the installation in About the trigger sign.

This invention relates to electrical measuring technology.

The purpose of the invention is to improve the accuracy and speed of the sensor.

FIG. 1 shows a block diagram of a sensor; in fig. 2 - time diagrams that show his work.

The high-speed current component sensor contains a voltage converter 1, the input of which is connected to the first sensor input, and an output to the first input of meter 2 of an instantaneous voltage value, the second input of which is connected to the output of the current-to-voltage converter 3 and to the first driver input 4 characters; input. Converter 3 whose output forms the output of the driver of the mark.

4. The sensor PP. 1-3, characterized in that the code rewriting unit is made in the form of a memory register, the first input of which forms the second input of the unit, and the output is connected to the input of a digital-to-analog converter (DAC) and to the input of the decoder, the output of which is connected to the input of the second delay element and forms the first output of the block, the output of the second delay element is connected to the first input of the fifth element And, the second input of which forms the first input of the block, and the output is connected to the second input of the register, the output of the DAC forms the second output of the block

5, The sensor PP. 1-4, which is based on the fact that the output unit is designed as an amplitude selector, the first and second inputs of which form the first and second inputs of the unit, respectively, and the output is connected to the switch input, the control input of the switch forms the third input of the unit, the first output of the switch through the fourth analog inverter is connected to the first input of the adder, to the second input of which the second output of the switch is connected, the output of the adder forms the output of the block.

 is connected to the second input of the sensor, the first output of the meter 2 is connected to the second input of the imaging unit 4, and the first output of the code rewriting unit 5 is connected to the third input, the second output of the meter 2 is connected to the first input, the third output of the meter 2 is connected to the second input, and the second output is the first input of the output

unit 6j to the second input of which the fourth output of the gauge 2 is located, and to the third input - the output of the imager 4; the output of block 6 forms the output of the sensor.

The instantaneous value meter 2 consists of a generator of 7 clock pulses.

the input of which forms the first input of the meter 2, and the outputs are connected to the inputs of the first 8 and second 9 detectors; detector output 9 through. the first analog inverter 10 is connected to the second inputs of the element OR 11 and the driver 12 memory pulses whose first inputs are connected to the output of the detector 8, the output of the driver 12 through the driver 13 of the control pulses is connected to the input of the third and fourth detectors 14 and 15, the inputs of which are connected respectively to the inputs of the first delay element 16 and the second analog inverter 17, the output of the element 16 is connected to the installation input 1 of the first trigger 18 and forms the first output of the meter 2, the output inver ora 17 is connected to the input of the setup on the flip-flop 18 and forms the third output of the meter 2, the output of the flip-flop 18 is connected to the clock input of the analog-to-digital converter (ADC) 19 sequential balancing, the reset input of which is connected to the output of the element OR 1 and the information input to the output the driver unit 20, the input of which forms the second input of the meter 2, the digital output of the ADC 19 forms the second output of the meter 2, the analog output of the ADC 19 forms the fourth meter 2.

The shaper 4 characters consists of a driver 21 pulses of the character, whose input forms the first input of the shaper 4, and the output is connected to the input of the fifth detector 22 and the sixth detector 23, the output of which through the third analog inverter 24 is connected to the first input of the first element And 25, the output of the detector 22 is connected to the first input of the second element AND 26, the second inputs of the elements AND 25 and 26 are combined and form the second input of the driver 4, the outputs of the elements 25 to 26 are connected respectively to the inputs of the installation in O and the installation in 1 of the intermediate trigger 2 7 characters, the direct output of which is connected to the first input of the third element And 28, the inverse output to the first input of the fourth element And 29; the second inputs of the elements And 28 and 29 are combined and form the third input of the imaging unit 4, and the outputs are connected respectively to the inputs of the installation in 1 and installation in

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20

25

with Q

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35

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45

trigger 30 characters, the output of which forms the output of the driver 4.

The code rewrite unit 5 consists of memory register 31, the first input of which forms the second input of unit 5, and the output is connected to the inputs of a digital-to-analog converter (D / A converter) 32 and decoder 33, the output of which is connected to the input of delay element 34 and forms the first output of unit 5, the output element 34 is connected to the first input of the seventh element And 35, the second input of which forms the first input of block 5, and the output is connected to the second input of the register 31; the output of the DAC 32 forms the second output of the block 5.

The output unit 6 consists of an amplitude selector 36, the first and second inputs of which form the first and second inputs of block 6, respectively, and the output is connected to the input of the analog switch 37, the control input of the switch 37 forms the third input of block 6, the first output of the switch 37 through the fourth the analog inverter 38 is connected to the first input of the adder 39, to the second input of which the second output of the switch 37 is connected; the output of the adder 39 forms the output of block 6.

Voltage converter 1 is a voltage transformer whose output is connected to the input of a two-stage integrator. Each of the integrator stages shifts the signal in phase by 45. When the active component is fixed, the integrator is turned off (the phase shift between output and input voltages is zero), while fixing the reactive component, the integrator is turned on (phase shift between each other). and the input voltage is 90 °).

The current-to-voltage converter 3 is a current transformer loaded on the measuring shunt.

The sensor works as follows.

Preliminary, depending on which of the components of the current should be fixed: active or reactive, respectively, disconnect or connect the two-stage integrator of the voltage converter 1. Then, the input mains voltage (Fig. 2a) is fed to the input of the converter 1, which is converted to the level necessary for normal operation of the meter -2. Input (measuring) current is fed to the input of converter 3 (fig. 2a), which is converted by it into proportional voltage. At the moments of the output voltage extrema of converter 1, driver 7 generates sync pulses of different polarities (Fig. 26). Negative sync pulses are detected by detector 9 and through inverter 10 are fed to the second input of generator 12, to the first input of which positive pulses are received, detected by the detector 8. At the output of the imaging unit 12, the memory impulses (Fig. 2c) have a given minimum possible duration. At the output of the former 13, control pulses of different polarities are formed (Fig. 2d). The field control pulses are inserted by block 14 and are applied to a delay element 16 to ensure that the instantaneous value of the signal is fixed. The delay time of the element 16 is set to approximately 1/3 of the duration of the memory pulses. The pulses from the output of the element 16 (Fig. 2d) set the trigger 18 to the state 1 and trigger the ADC 19 successive balancing. Negative control pulses are detected by detector 15, through inverter 17 (Fig. 2g) reset trigger 18 to state O and stop ADC 19. Reset 3 O of content of ADC 19 is performed by sync pulses (Fig. 26) from the output of the element OR 11 arriving to the ADC reset input. The voltage from the output of the converter 3 is fed to the input of the imaging unit 20, the output of which generates a signal proportional to the input current module that arrives at the information input of the ADC 19. At the end of the balancing, an analog signal is formed at the analog output / W1 19 proportional to the instantaneous value of the input current module, and at the digital output - the code corresponding to this analog signal. The signals at the outputs of the ADC 19 are stored until the clock pulses (Fig. 26) arrive at the reset input in the O ADC. In this way,

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The analog and digital outputs of the ADC 19 generate and store the analog and digital signals corresponding to a fixed component of the input current during a half-period of the supply voltage.

To obtain a continuous analog signal at the output of the sensor, code is rewritten from the digital output of the A / D converter 19 to memory register 31, which is previously reset to O by negative-polarity control pulses (Fig. 2g). When O appears at the 5th output of the register 31, the decoder 33 through the delay element 34 supplies the first input element I 35 of the signal 1, allowing the code to be overwritten from the digital output of the ADC 19 to the register 31. The rewritten code converts the DAC 32 to an analog signal (Fig. 2i ), practically repeats the signal from the analog output of the ADC 19. Delay element 34 serves to provide the overlap in time of the analog signal of the ADC 19 (FIG. 2h) and its rewritten analog (FIG. 2i).

The determination of the sign of the input current is determined as follows.

The signal corresponding to the measured current from the output of the converter 3 is fed to the input of the former 21, at the output of which rectangular pulses (Fig. 2k) are formed, the sign of which corresponds to the sign of the input current. The detector 22 extracts positive polarity pulses, and the detector 23 produces negative polarity pulses, then input to the inverter 24. The current polarity pulses are fed to the first input of the AND 26 element, and the inverted current polarity pulses to the first the input element And 25, to the second inputs of the elements 25 And 26 to the control pulses (Fig. 2D). When the sign of the control pulses (Fig. 2e) coincides with the sign of the positive polarity of the current sign (Fig. 2k), the element 26 forms beep 1, input to the set input to latch 1 27, which is mounted on the forward output with the state 1. When the signal 1 from decoder 33 to .vtoroy input AND gate 28, flip-flop

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30 is set to state 1. When the signal 1 is applied to the input of the analog switch 37, the output of the selector 36 is switched with the first input of the adder 39 (when O is fed to the input of the switch 37, the output of the selector 36 switches to the input of the inverter 38). Thus, the analog signal (Fig. 2h) and its rewritten analog (Fig. 2i) are assigned the positive

eight

sign, and at the output of the adder 39, which is the output of the current component sensor, a continuous analog signal (Fig. 2L) is formed, corresponding to the active or reactive component of the input current,

For a negative half-wave supply voltage, the sensor works in a similar way.

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Compiled by S. Rybin Editor I. Rybchenko Tehred Z. Kastelevich Proofreader.

Order 8522/4 () Circulation 747 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (5)

(5.4) 1. A high-speed current component sensor, comprising a voltage converter, the input of which is connected to the first input of the sensor, and a current to voltage converter, the input of which is connected to the second input of the sensor, characterized in that, in order to improve accuracy and speed, an instantaneous voltage meter, a signifier, a code rewriting unit and an output unit are introduced, the output of the voltage converter being connected to the first input of the meter, the second input of which is connected to the output of the converter For current to voltage and the first input of the signifier, the first output with the second input of the signifier, the second output with the first input of the rewriter, the third output with the second input of the rewriter, and the fourth output with the second input of the output unit, third input of the signifier it is connected to the first output of the overwrite unit, and the output to the third input of the output unit, the first input of which is connected to the second output of the overwrite unit, and the output to the output of the sensor. 2. The sensor according to claim 1, characterized in that the instantaneous voltage meter is in the form of a synchronizing pulse shaper, the input of which forms the first input of the meter, and the output is connected to the inputs of the first and second detectors, the output of the second detector through the first the analog g inverter is connected to the second inputs of the OR element and the pulse shaper of the memory, the first inputs of which are connected to the output of the first detector, the output of the pulse shaper of the memory through the shaper of control pulses is connected to the inputs of the tego and fourth detector. tori, the outputs of which are connected respectively to the input of the first delay element and to the input of the second analog inverter, the output of the first delay element is connected to the installation input in 1 of the first trigger and forms the first output of the meter, the output of the second analog inverter is connected to the installation input to 0 of the first trigger and forms the third output of the meter, the output of the first trigger is connected to the clock input of an analog-to-digital converter (ADC), the reset input of which is connected to the output of the OR element, and the information input is connected to the output of the The module driver, the input of which is about SU, 1205039 develops the second input of the meter, the digital output of the ADC forms the second output of the meter, the analog output of the ADC is the fourth output of the meter. 3. The sensor according to paragraphs. 1hZ, characterized in that the character shaper is made in the form of a pulse shaper of the sign, the input of which 'forms the first input of the character shaper, and the output is connected to the input of the fifth detector and the sixth detector, the output of which through the third analog inverter is connected to the first input of the first element And, the output the fifth detector is connected to the first input of the second element And, the second inputs of the first and second elements And are combined and form the second input of the sign former, and the outputs are connected respectively to the input of the installation at 0 and to the input anovki 1 intermediate latch plate, direct output of which is connected to the first input of the third AND gate, and the inverse output - to the first input of the fourth AND gate, the second inputs of the third and fourth members and combine to form the third input of the ^sign; the outputs are connected respectively to the input of the set to 1 and to the input of the set to 0 trigger character, the output of which forms the output of the shaper sign. 4. The sensor on the square. 1-3, characterized in that the code rewrite unit is made in the form of a memory register, the first input of which forms the second input of the unit, and the output is connected to the input of the digital-to-analog converter (DAC) and to the input of the decoder, the output of which is connected to the input of the second delay element and forms a first output unit, the output of the second delay element connected to the first input of the fifth aND gate, the second input of which forms the first input unit, and an output connected to the second input register, a DAC output forms a second output unit _h 5. The sensor according to paragraphs. 1-4, wherein the output block is made in the form of an amplitude selector, the first and second inputs of which form the first and second inputs of the block, respectively, and the output is connected to the input of the switch, the control input of the switch forms the third input of the block, the first output the switch through the fourth analog inverter is connected to the first input of the adder, to the second input of which the second output of the switch is connected, the output of the adder forms the output of the block.