SU674201A1 - Device for automatic discrete tuning of circuit - Google Patents

Description

;; . ; - one -, - / -. - The invention relates to the field of radio engineering, in particular, to devices for tuning oscillatory circuits. -; : .-; -.- The device is known for discrete automatic tuning of the oscillating circuit / whose tuning is made by applying to the setup element 1. The device contains: a variable loop, a frequency discriminator with two outputs of the sign of the frequency deviation from the set value, n-bit memory element of discrete value of control voltage value and digital-analogue converter. However, this device does not satisfy the requirements of high, on the order of several tens of Hertz, tuning accuracy, although it allows to obtain a small tuning time for a given frequency (10-100 ms). In addition, setting elements (varicap, varicode), controlled by voltage, cannot work at cryogenic EiiaTypax, and consequently, can be used in superconducting resonance circuits. The closest technical solution to this invention is a discrete automatic loop tuning device containing a field unit connected in series, a tunable loop, a kbtoiio control input connected to the output of a control unit, a secondary element and a digital frequency discriminator, a clock generator, whose output / connected to the first and second terminals; And, as well as a deshfrator, a pulse counter and a static trigger 2. The disadvantage of this device is not enough high tuning accuracy of the oscillating circuit, and. It is also that the setting of the kit and the set frequency of the CTpoift should necessarily be configured in the on state. The aim of the invention is to improve accuracy. : For this purpose, in a discrete automatic loop tuning device containing a series-connected excitation unit, a tunable code, the control input of which is connected to the output of the control unit via the actuator X and

digital frequency discriminator, a clock pulse generator whose output is connected to the first and second AND elements, as well as a decoder, pulse counter and static trigger, another input of the first AND element is connected to the static trigger output, the first deshfrater output is connected to the control inputs of the excitation unit, digital frequency discriminator and pulse counter, the output of the second element And is connected to the inputs of the pulse counter and the control unit, between the output of the digital frequency discriminator and the inputs of the article This device is connected in series with the difference code analysis unit and an additional element AND, another input of which is connected to the second output of the decoder, between the output of the digital frequency discriminator and another input of the second element AND of the comparator, the other input of which is connected to the output of the pulse counter, and between the output of the first element And and the input of the decoder included an additional. tele pulse counter.

In addition, a piezoelectric transducer is used as an actuator in the device.

The drawing shows a structural electrical circuit of the proposed device.

The discrete automatic circuit tuning device contains a series-connected excitation unit 1, a tunable circuit 2, the control input of which is connected to the output of the control unit 3 through the actuator 4, and a digital frequency discriminator 5, a clock generator 6, the output of which is connected to the first and second elements And 7 and 8. The device also contains a decoder 9, a pulse counter 10 and a static trigger 11. The second input of the first element And 7 is connected to the output of a static trigger 11. The first output is de The cutter 9 is connected to the control inputs of the excitation unit 1, the digital frequency discriminator 5 and the pulse counter 10. The output of the second element I 8 is connected to the inputs of the pulse counter 10 and the control unit 3. Between the output of the digital frequency discriminator 5 and the input of the static trigger 11 in series the difference code analyzer block 12 and the additional element I 13 are included, the other input of which is connected to the second output of the decoder 9. Between the output of the digital frequency discriminator 5 and the other input of the second element 8, b is turned on Comparison block 14, another one, whose input is connected to the output of pulse counter 1.. Between the output of the first element and 7

and the input of the decoder 9 included an additional pulse counter 15.

The device works in a CJId way.

The tuning command is sent to one of the inputs of the static trigger 11 and changes its state. From the trigger output, the resolving potential is applied to the first element, And 7, and the pulses arriving at the second input of this element 7, from the output

clock pulse generator 6 is passed to the input of an additional pulse counter 15, the outputs of which are connected to the inputs of the decoder 9. With the arrival of the first pulse on

the input of the pulse counter 15 from the first output of the decoder 9 removes the pulse of the beginning of the cycle, which enters the excitation unit 1, the digital frequency discriminator 5 and on

pulse counter 10 input. After the arrival of the start of the cycle, the excitation unit 1 transfers the tuned circuit 2 to the generation mode, and the frequency discriminator 5 prepares for counting the oscillation frequency from the output of circuit 2. Then for a certain time, which depends on the accuracy of the loop tuning, in digital frequency discriminator

5, the oscillation frequency from the Tsonture output is counted, the summation with the code of the specified frequency of the loop tuning and the output of the difference code to the inputs of the comparison unit 14 and the difference code analysis unit 12 are output.

If the difference code is not zero, then a signal from the output of the comparator 14 is relaxed, allowing the passage of pulses from the output of the clock generator 6 through the second element

And 8 to the input of the pulse counter 10 and the control unit 3.

Pulse counter 10 counts clock pulses as long as the number of pulses arriving at

its input does not match the code

the difference, then from the output of the comparator unit 14 to the input of the second element I 8 a signal prohibits the passage of pulses of the clock frequency to the input of the pulse counter 10. From each pulse that is fed to the input of the control unit 3, a packet of three pulses spaced in time is formed and calibrated pv amplitude and duration. From the output of the control unit 3, a burst of impulses is fed to the input of the actuating element 4, which displaces the organ for adjusting the contour

2 in one step, the magnitude of which is determined by the amplitude of the pulse applied to the injector: the receiver element 4, rectified in the form of a step piezoelectric transducer. After graduation

Claims (2)

moving the rearrangement body from the second output of the decoder 9 to one of the 5 inputs of element 13, a pulse ends the cycle, and the second input receives a signal from the block of code analysis 12, which allows the end of the cycle to pass to the second input of the trigger 11, when the difference code will be zero. If the difference code is equal to zero, then the pulse of the end of the cycle goes through element 13 and transfers trigger 11 to the initial position, after which the process of tuning circuit 2 to the specified frequency ends and the circuit transits from the generation mode to the passive state. The accuracy of setting the contour 2 is determined by the magnitude of the unit displacement (pitch). The displacement speed o of the loop tuning loop and, consequently, the tuning time is determined by the frequency of the control voltage supplied to the piezo transducer and the magnitude of the unit displacement. Since, after setting the tuning frequency, the proposed device may be de-energized, a large energy saving is achieved. Especially important for devices that work. melting at cryogenic temperatures. Considering that the piezoelectric transducer is capable of operating at cryogenic temperatures and emit an insignificant amount of heat (not more than 0.7 watts), it is located in the same volume as a 1 "dm contour, which greatly simplifies the mechanical transducer with a configuration element and is not requires additional measures to seal the volume in which the circuit is located. Thus, the device of discrete automatic tuning of the circuit allows to ensure the relative tuning accuracy of the oscillatory circuit at the upper limit of the KB range of the order of s and the tuning time to a given frequency less than 10 Ohms and energy consumption not more than 3–4 watts. 01. Claim 1. Discrete automatic loop tuning device comprising an excitation unit connected in series, a tunable loop, the control input of which is connected to the output of the control unit via an actuator, and a digital frequency discriminator, a clock generator, the output of which is connected to the first and second elements And, and the decoder, the pulse counter and the static trigger, are from the fact that, for the purpose of accuracy, another input of the first element I is connected to the output static trigger, the percolator output of the decoder is connected to the control inputs of the digital frequency discriminator and pulse counter excitation unit, the output of the second And element is connected to the pulse counter and control unit inputs, between the digital frequency discriminator output and the static trigger input, sequentially, the difference code analysis unit and an additional element And, another input of which is connected to the second output of the decoder, is placed between the output of the digital frequency switch and the other input of the second of the AND block sravvoni enabled, the other input of which is connected to the output of the pulse counter, and "ezhdU output of the first AND gate and the input of the decoder the additional pulse counter. ;. ./..-. 2, The device according to n.i, characterized in that a stepper pjb converter is used as the main element. Sources of information taken into account in the examination 1. The author's certificate of the USSR 365014, cl. N 03 3/04, 1972. 2. Authors certificate of the USSR 365803 / cl. N 03 X 3/00, 1973. Hue code / gmmt HofmiMivm „Flaefrt a