SU1450069A1 - Multiphase resettable generator of harmonic oscillations - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to provide a change in the phase shift of the voltages of the output signals while their frequencies do not change. The device contains voltage-current converters 1 and 2, controlled phase shifters 3 and 4; amplitude stabilization fleas 5, blocks 6 and 7 of comparison, sources 8 and 9 of reference and control voltages, amplifiers 10 and 11, scale resistors 12 and 13, switch 14 and switch 15. The goal is achieved by inserting a resistor 13, switch 14 and switch 15, by means of which the output voltages form a three-phase system with a phase shift of 120. 1 sludge. about $ (L p. 4; SP

Description

The invention relates to radio engineering and the model to be used in phase-controlled automatic control devices.

The purpose of the invention is to provide a change in the phase shift of the voltages of the output signals while their frequencies do not change.

The drawing shows a structural electrical multi-phase tunable harmonic oscillator circuit /

The multiphase tunable harmonic oscillator contains the first converter 1 voltage-current, the second converter 2 capacitive current, the first and second controlled phase shifters 3 and 4, the amplitude stabilization unit 5, the first and second blocks 6 and 7 of the reference, the source 8 of the reference voltage source, | 9 control to the voltage, the first and second amplifiers 10 and 11, the first, and

I second scale resistors 12 and 13 key 14, switch 15. Each of the first and second controllable faders 3 and 4 and 4 includes an operational amplifier 16, a first and a second resistor 17 and 18, a capacitor 19 and 20 with electrically controlled resistance.

Mlio-phase tunable generator; harmonic oscillation work; em as follows. : When the supply voltage IB is turned on, the ring containing the first and second controlled phase shifters 3 and 4, each of which consists of an operational amplifier 16, first and second resistors 17 and 18, capacitor 19 and element 20, first scale resistor 12 and block 5, undamped harmonic oscillations occur.

The control voltage from the output of source 9 and with the help of the first and second converters 1 and. 2 is converted into proportional currents.

1 K, and, (; I,, (1)

where K, K are the conversion coefficients of the first and second converters 1 and 2, Currents I, and T. flow through elements 20 of the first and second controlled phase shifters 3 and 4, the voltage drop on which due to the presence of an adjustment ring consisting of block 6 and amplifier 10 as well

unit 7 and amplifier 11, equal to a static error, the reference voltage from the output of the switch 15.

E

01

- -i, R, j ,;

corner

og (2)

where R, S. - resistance of elements

Commodity 20 of the first and second controlled phase shifters 3 and 4. Therefore

Moreover, if key 14 is open and switch 15 is in position I (mode I), the frequency of the output oscillations C0 (determined from the ratio

oh 1

R.c

(five)

where C is the capacitance of the capacitor 19 of the first and second controlled phase shifters 3 and A. Or taking into account (4)

On

CE

(6)

ABOUT

35

40

45

The phases of the harmonic oscillation voltages and and U, as well as U and U, are shifted by 90, where and, 50

the voltage at the output of the first controlled phase shifter;

the output voltage of the second controlled phase shifter 4-,

the voltage at the output of the unit 5. When the key 14 is closed, the output of the first controlled phase shifter through the second scale resistor 13 is connected to the block 5, the switch 15 is set to position II (mode II),

and “and. The frequency of free harmonic coils in mode II do is determined from the ratio.

-CO,

one

(7)

From the analysis of expression (7), it follows that in order for the oscillation frequency

during the transition from mode I to mode II did not change for a given control voltage, it is necessary to reduce the resistance Rn by a factor of 10, which is 14

is choked by the choice of voltage at the additional output of the 8 E source

according to the ratio of 1

oi

E

02

E

01 1

(eight)

where U is the voltage at the main output of the source 8. In this case, the frequency of the transient oscillations in mode II is determined by an expression similar to expression (6):

To UCH.

C E

 04

 b1

(9)

and is proportional to the control voltage. In this case, the voltages U, U, U form a three-phase system with a phase shift of 120 °. Key installation 14 and switch 15

in position synchronously.

I and II produced

Claims (1)

Claim 1 A multiphase tunable harmonic oscillator containing one and two controlled phase shifters connected in series, each of which consists of an operational amplifier, the output of which is the output of the controlled phase shifter, capacitor and the first resistor, the first outputs of which are combined and are input controlled phase shifter, the second terminals of which are connected, respectively, to the non-inverting and inverting inputs of the operational amplifier, of the element with electrically controlled m resistance, which is connected between the second capacitor lead and the common bus, the control input of which is the control input of each of the controlled phase shifters, as well as the amplitude stabilization unit, the output of which is connected to the input of the first controlled phase shifter, the first large-scale resistor, 1450069 which is connected to the output of the second controlled phase shifter and the input of the amplitude stabilization unit, the control voltage source, the first and second voltage to current converters, whose inputs are connected to the output of the control voltage source, the outputs of which are connected to non-inverting inputs operational amplifiers, respectively, of the first and second aggravated phase shifters, connected in series the first comparison unit and the first amplifier, the output of which is connected to the control input of the first controlled phase shifter, connected in series to the second comparison unit i and the second amplifier, output 20 of which is connected to the control to the eater the input of the second controlled fdzovorach, the source of the reference voltage, the first inputs of the first and second comparison blocks are combined, and their 25 second inputs are connected to non-inverting inputs of the operational amplifiers of the first and second controlled phase shifters, changes in the phase shift of the output voltages at constant frequency The actuator and the input of the amplitude stabilization unit, the switch, the output of which is connected to the first inputs of the first and second blocks is 0NIN, and the reference source is provided with an additional output, while the first and second inputs of the switch are connected respectively to the main and additional outputs g of the reference source voltage, and the voltage at the additional output 0 five the reference voltage source E is selected from the ratio  02 E 01  E „, where U, is the voltage at the main output of the source of the reference voltage, and the control inputs of the key and switch are combined. CHANGES Order 6973/52 Random polygons Uzhgorod, st; Project, 4 Circulation 929 Subscription