Method of controlling attenuation in oscillatory lc circuit

FIELD: radio engineering, communication.

SUBSTANCE: method of controlling attenuation in an oscillatory LC circuit is based on connecting an additional resistor ρ<<r to the circuit between the earth and an inductance coil, where r is the active resistance of the coil, and introducing special initial conditions for generation of controlled oscillations. External emf is introduced into the circuit, the value of which is equal to the voltage across the resistor amplified k times without inversion and periodisation of the launch modes and the initial position. The required nature of attenuation is established and observed by controlling the equivalent resistance of the circuit r*=r-ρ(k-1); if r*>0 the process is attenuating, if r*=0 the process is not attenuating and if r*<0 the process is rising.

EFFECT: establishing the required nature of attenuation in controlled oscillations.

2 cl, 1 dwg

 

The present invention relates to electronics and, in particular, to techniques for generating oscillations of a special form and can be used in radio technique and radio. Trains (pack of oscillations) are widely used in radio engineering.

Famous new type of harmonic oscillations - regulated oscillations (RK), which are generated using nodes analog computing machinery (integrators, trigonometric functional converters), which is strictly regulated character of change of the instantaneous phase of these oscillations in time [1]. Instantaneous phase RK either decreases or increases, and its temporary slope (frequency) can be controlled in a wide range of negative and positive values, including to be zero.

Closest to the proposed invention is a method of generating a regulated oscillations [2]. The method is performed as follows.

1. In the initial position (IP) charged capacitor to a voltage Ho.

2. Ask in the inductance L in mode 1 positive current Io1=(-h+jf)CXo from source +Ho, and 2 negative current Io2=(-h-jft)CXo from source-Ho.

3. The start command (P) disconnect the circuit to charge a capacitor.

4. Interrupt positive current in the inductance in mode 1 by turning off the source of +Ho and negative current in mode 2 by turning off the source-Ho.

5. Remove from capacitor With trains of damped RK

X=Xoe-htejftinpeWandme1and(1)

X=Xoe-hte-jftinpeWandme2.(2)

7. Control the sign of the frequency of the generated oscillations invert a voltage source that sets the initial current in the inductor.

This method has a number of advantages: simple design, clear regulation of the sign of the frequency (both mathematical and physical), quick switching of the sign of the frequency. But the big problem hindering the development of the Republic of Kazakhstan, is the inability to control the attenuation in this linear system, which 60 years ago proved G.S. Gorelik [3]. However, during this time, he created a rich element base of operations is the R amplifier (op-amp), providing a stable linear amplification in a wide range of operating voltages that ensures successful solution of this task.

The techniques set special initial conditions of the prototype used in this. The next group of methods is new compared to the prototype.

1. Enter between the earth and the beginning of the inductor resistor ρ<<r, where r is the resistance of the turns of the coil.

2. The voltage across this resistor is linearly increased to time without inversion.

3. Injected into the resonant circuit sided EMF equal to the increased voltage.

4. Install the necessary nature of the attenuation by adjusting the equivalent resistance of the circuit r*=r-ρ(K-1), when r*>0 - fading process, if r*=0 is a continuous process, with r*<0 - growing process.

The equation of a harmonic oscillator when this takes the form

wherer=r-ρ(k-1). (4)

Thus, new techniques of the proposed method opens in radio another way (except RC - MS) generate negative resistance of the oscillatory circuit.

Comparative analysis of the claimed is the procedure with the prototype shows its distinctive features are essential, because in this combination they are unknown in modern patent and scientific literature. In connection with the foregoing the method of controlling the attenuation meets the criterion of "novelty".

The simplicity and accessibility regulation r*put a different, but supporting role: enter mode electronic periodization observed processes of decay in an oscillatory circuit. To solve this problem has a modern element base - electronic keys. Chain set special initial conditions, providing the generation of RK, do not contradict their application

High inventive step of the proposed method lies in opening up the prospect of mass circuitry generators RK, before the creation of which was left to make the last step.

Figure 1 shows an example of the technical implementation of the proposed method.

The device consists of a typical oscillating LC circuit 1, condenser which is represented by two series-connected capacitors, due to the artificial introduction of a special initial conditions. Between the earth and the beginning of the coils included resistor ρ. The contour of the connected chain of linear positive feedback, consisting of a large-scale OW without inversion, the output of which is connected to the end of the showing of the capacitor circuit. Special initial conditions are fed through resistors RT and ½rch╗, respectively connected to the outputs normally open contacts of the electronic key (EK) 3, 4. Input contacts EK 3 is connected to the middle pin of the toggle switch modes 5, is connected to the power supply +Ho-Ho. Input contacts AC connected to the source +Ho. The control input EC is connected to a source of rectangular pulses 6 (meander). The specificity of periodization job special initial conditions consists in the following. In IP mode 1 in the inductor flows positive current I, the sign is the sign of the source +Ho, and the value of the resistors R+ +RT - and the value of the source +Ho, and 2 - negative current I, the sign is the sign of the source-Ho, and the value of resistors R- +RT and the value of the source-Ho. The capacitors in both modes is charging with appropriate selection of the nominees to the value +Ho. When you start setting circuit is interrupted, the switching contacts of keys isolated resistors RT and ½rch ╗ loop, which develops Zug RK. The need for periodization is required for the observation of damped and growing processes. When r*=0, then there is no need for it. Disabling the supply of the meander can be observed indefinitely RK+

X=Xoejft/msup> inmode1(5)

and RK-

X=Xoe-jftinpeWandme2.(6)

You should follow this procedure: first, set the mode 1 or 2 when periodization, and then disable periodization.

The proposed method is easy to implement. Resonant circuit 1 can be any. To improve clarity, and faith in the real existence of the Republic of Kazakhstan the inductor is advisable to choose on the stranded wire type Litz wire (to increase its q-factor). Resistor ρ should consist of a segment of high resistance wire (nichrome, Constantan). Set serving of chips may be as follows: HL 2 - CUT, EQ,4 - one case CNN, interface circuit 6 EC with meander - two items from chips KLA [4].

List of used sources

1. RF patent №2131144. Method of generating oscillations. Auth. Fig. Prokofiev E.B., G06G 7/26, NV 1/00, publ. B.No. 15, 1999

2. Prokofiev E.V. method of producing a regulated oscillations. Application EN 2010114107, 2010

3. Gorelik G.S. Oscillations and waves. - M.: Sofisticat, 1959, p.121.

4. Nefedov AV Integrated circuits and their foreign counterparts, V.6, M.: Radiosoftware, 2000

1. The method of controlling the attenuation of the oscillating LC circuit, based on the connection path between the earth and the beginning of the coils of the additional resistor ρ<<r, where r is the resistance of the coil, and the introduction of special initial conditions generate regulated oscillations, wherein introducing the third circuit EMF equal enhanced in to time without inversion voltage with resistor ρ, establish the required character attenuation by adjusting the equivalent resistance of the circuit r*=r-ρ(K-1), when r*>0, the fading process, when r*=0 the process is continuous, with r*<0, the process of growing.

2. The method of controlling the attenuation according to claim 1, characterized in that the imposed periodicity of the modes of start-up and initial position by the electronic interrupt circuit set the initial current in the inductor L and the initial voltage on the capacitor C with adjustable frequency periodization.



 

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FIELD: radio engineering, communication.

SUBSTANCE: method of controlling attenuation in an oscillatory LC circuit is based on connecting an additional resistor ρ<<r to the circuit between the earth and an inductance coil, where r is the active resistance of the coil, and introducing special initial conditions for generation of controlled oscillations. External emf is introduced into the circuit, the value of which is equal to the voltage across the resistor amplified k times without inversion and periodisation of the launch modes and the initial position. The required nature of attenuation is established and observed by controlling the equivalent resistance of the circuit r*=r-ρ(k-1); if r*>0 the process is attenuating, if r*=0 the process is not attenuating and if r*<0 the process is rising.

EFFECT: establishing the required nature of attenuation in controlled oscillations.

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5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method of controlling attenuation in an oscillatory LC circuit is based on connecting an additional resistor ρ<<r to the circuit between the earth and an inductance coil, where r is the active resistance of the coil, and introducing special initial conditions for generation of controlled oscillations. External emf is introduced into the circuit, the value of which is equal to the voltage across the resistor amplified k times without inversion and periodisation of the launch modes and the initial position. The required nature of attenuation is established and observed by controlling the equivalent resistance of the circuit r*=r-ρ(k-1); if r*>0 the process is attenuating, if r*=0 the process is not attenuating and if r*<0 the process is rising.

EFFECT: establishing the required nature of attenuation in controlled oscillations.

2 cl, 1 dwg

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