SU769563A1 - Controllable harmonic signal generator - Google Patents

Description

The invention relates to the field of analog computing technology and can be used, in particular, in vector control systems, as a sensor, as well as in measurement equipment as part of master oscillators. A controllable harmonic signal generator il is known, comprising two integrators, two multiplication units and an amplitude stabilizer, including a square module calculator, a PI-controller and two multiplication units. Its disadvantage is a narrow frequency dialase. The closest IM to the technical essence of the invention is a controlled generator of harmonic signals 2, containing two integrating amplifiers, two multipliers connected to them, the set of initial conditions, the outputs associated with the corresponding inputs of the integrating amplifiers, and the amplitude stabilizer The driver is a LMO module, a PI controller, a dividing unit and two multiplying blocks. The first and second inputs of the amplitude stabilizer are connected to the corresponding inputs of the calculator module, the output of which is connected to the single input of the PI reged torus and the first input of the divide, the second input of which is connected to the output of the PI controller. The other input of the PI controller is connected to the control input of the stabilizer. The output of the division unit is connected to the first inputs of the multiplying units, the second inputs of which are connected to the corresponding inputs of the calculator module and the amplitude stabilizer, and the outputs of the multiplying blocks are the outputs of the stabilizer. The disadvantage of the device is that at low frequencies there is a strong distortion of the sinusoidal output signals, leading to a narrowing of the working frequency range. This is due to the dependence of the stabilizing feedback coefficient on the frequency, since the quality of stabilization at the boundaries of the frequency range becomes unsatisfactory due to the deviation of the indicated coefficient from the optimal value. The aim of the invention is to improve the stabilizing properties and reduce distortion of the output signals at low frequencies. This goal is achieved by the fact that a controlled harmonic generator containing two integrating amplifiers, the first inputs of which are connected to outputs of the first and second blocks, respectively, are the mind, legs, and the outputs are connected to the corresponding signal inputs of the amplitude stabilizer, the input of which is connected The generator input, the second inputs of the integrating amplifiers are connected to the outputs of the initial conditions setting block, the first inputs of the modules of the lock are connected to the second Compressor input of the generator, containing gumming two amplifier outputs coupled to respective second inputs of multipliers, per.vye inputs - outputs corresponding to the integrating amplifier and the second input - to the respective outputs of item reguliruyuschi1m the stabilizer amplitude.

The generator contains amplitude stabilizer 1, integrating amplifiers 2, 3, multiplication blocks 4, 5, summing amplifiers 6, 7, block 8 of initial conditions.

The .ra generator is as follows.

The control signal applied to the generator input P determines the amplification factor in the circuit and the frequency of the generated oscillations, the voltage applied to the control unit, the input input 10 - the amplitude of the oscillations.

The signals from the outputs of the amplifiers 5 and fed to the inputs of the stabilizer 1. As a result, from the outputs of the stabilizer to the inputs of the summing amplifiers 6, 7, signals stabilizing α-amplitude are received. In this case, the feedback coefficient is determined by the relative error of the amplitude, and the sign of the feedback is determined by the sign of the amplitude error: if the given amplitude is larger than the real one, the feedbacks are positive, and 1% is negative, and the connection is negative, and their equality. The feedback coefficients are zero. After summing up the amplifiers 6, 7 of the error signal and the main signal, the resulting signals are fed to the inputs of the blocks 4, 5.

Thus, multipliers 4, 5 determine the gain of amplifiers 2, 3 to the error signal. As a result (the coefficient of the stabilizing feedbacks of the amplifiers 2, 3 is determined by the magnitude of the given frequency co.

Unlike the prototype, the quality of the transient stabilization processes becomes

independent of the frequency of the signals, the low frequency distortion of the oscillation Hia is reduced significantly, where from the magnitude of the error signals at the output of the stabilizer to the main signal at the inputs

amplifiers 2, 3 is the largest and equal to this ratio at the maximum frequency multiplied by the frequency range. As a result, the frequency range of the stability of the quality operation of the generator increases.

Formula of Invention

Controlled harmonic generator

Signals containing two integrating amplifiers, the first inputs of which are connected (to the outputs of the first and second blocks of the U1M1DOOP, respectively, and 1 outputs to the corresponding –signal inputs of the amplitude stabilizer, the input of which is connected to the first control input of the generator, the second inputs of the integrating amplifiers are connected to the outputs of the block set initial conditions, the first inputs

multiplication units are connected to a second generator control input, characterized in that, in order to improve the stabilizing properties and reduce the distortion of the output signals at low levels

frequencies, the generator. p contains two summing amplifiers, the outputs of which are connected to the second inputs of the respective multiplication units, the first inputs to the outputs of the corresponding integrating

amplifiers, and the second inputs - to the corresponding regulating outputs of the amplitude stabilizer.

Sources of information taken into account in the examination:

1. Design and use of operational amplifiers. Ed. J. Graham et al. M., “Peace, 1974, p. 433.

2. USSR author's certificate number 64: 27i24, cl. G 06 G 7/36, 1976 (prototype).

Claims (1)

Claim A controlled harmonic signal generator containing two integrating amplifiers, the first inputs of which are connected to the outputs of the first and second multiplication units, respectively, and the outputs are connected to the corresponding signal inputs of an amplitude stabilizer, the setpoint of which is connected to the first control input of the generator, the second inputs of integrating amplifiers are connected to the outputs block setting initial conditions, the first inputs of the multiplication blocks are connected to the second control input of the generator, characterized in that, in order to improve biliziruyuschih properties and reduce the distortion of the output signals at low frequencies, the oscillator comprises two summing amplifiers, the outputs of which are connected to respective second inputs of multipliers, first inputs - outputs corresponding to the integrating amplifier and the second input - to the corresponding control output of the amplitude stabilizer.