CS258662B1 - Connection for generating harmonics - Google Patents

Abstract

The purpose of the circuit for generating harmonic oscillations is to achieve an undistorted signal with a constant amplitude and a variable frequency. The stated purpose is achieved by connecting the polarity change block (2) to an integrator (3), the output of which is connected to a comparator (4). The output of the integrator (3) is connected to a functional converter (5j) and to a memory control comparator (7), the output of which is connected to a block (1) of analog memories. The output of the switch (6) is connected to a comparator (4), while the block (2) of polarity change and one input of the switch (6) are connected to the comparator (4). The circuit for generating harmonic oscillations can be used wherever a continuously or step-changing frequency of a harmonic signal and its long-term constant amplitude are required, e.g. in the investigation of the frequency and phase characteristics of control circuits, in the modeling and simulation of electrical rotating machines or as an excitation function in the investigation of oscillatory processes.

Description

BACKGROUND OF THE INVENTION The present invention relates to a circuit for generating harmonic oscillations with amplitude stability and with the possibility of continuously varying frequency.

The known harmonic oscillation circuits are based on the modeling of the differential equation, whose solution is the harmonic oscillation function. With this method of generating the harmonic function, there are difficulties in stabilizing the amplitude of the harmonic oscillations. Also, the possibilities of continuous or step change in frequency are associated with considerable difficulties. In order to change the frequency, it is necessary to make changes to the steam, the subway creating the differential equation. If it is necessary to change the frequency of the harmonic oscillations by the control voltage, it is necessary to use analog multipliers, which leads to complex connections.

The above disadvantages are substantially eliminated by the circuitry for the regeneration of harmonics, the principle of which is that the polarity change block is connected to an integrator whose output is connected to the comparator. At the same time, the integrator output also has a functional converter and a memory control comparator, the output of which is linked to an analog memory block. The switch output is coupled to a comparator, wherein the polarity change block and one switch input are coupled to the comparator. An advantage of the invention is the simple change of frequency while maintaining the selected amplitude in the frequency range of 0.01 to 104 Hz. Another advantage of the connection is to obtain an undistorted harmonic signal at a step change in the frequency control voltage. The connection is easier, more reliable and does not require the use of analog multipliers.

1 is a schematic representation of a block connection for generating harmonic oscillations; FIG. 2 shows the transformation of a triangular signal into a harmonic signal depending on the functional converter used; FIG. Fig. 4 shows the dependence of the harmonic function on the step control voltage with the analog memory block connected.

The circuit for generating harmonics consists of an analog memory block 1 which is connected to a polarity change block 2 and a memory control comparator 7. The polarity change block 2 is connected to an integrator 3 whose output is connected to a comparator 4 with a memory control comparator 7 and The switch 6 is connected to the comparator 4. The polarity change block 2 and the switch input 6 are connected to the comparator 4.

The connection for generating harmonics works as follows:

Blocks 2, 3, 4 form triangular oscillations, the frequency of which is given by the magnitude of the voltage U1 and the time constant of integrator 3. The comparator 4 compares the output voltage U3 of the integrator with the value of the freq. The integrator U3 triangular output voltage is converted to the U4 harmonic signal in the functional converter 5. The Memory Controller indicates the transition of the U3 voltage to zero level and the logic signal F2 controls the pair of analog point memorabilia. The operation of block 1 is shown in Fig. 4. Jump change of the input signal Uvst is time shifted to terminate the whole period of the harmonic signal and only after its termination the value of the control voltage of the frequency U 1 has been changed. The amplitude of the harmonic signal is determined by the UREF and its stability determined by the accuracy and stability of the UREF and the sensitivity of the comparator 4.

The harmonics connection can be used wherever variable, continuous or stepped, changing the frequency of the harmonic signal and its long-term constant amplitude, eg in the frequency and phase characteristics of control circuits, in the modeling and simulation of electrical rotating machines, or as a musical function in investigating oscillating events.

Claims (2)

SUBJECT Harmonic regeneration circuit, characterized in that the polarity reversal block (2) is connected to an integrator (3), the output of which is connected to a comparator (4), the output of the integrator (3) being connected to a functional converter (5) and a memory control compiler (7), the output of which is coupled to the analogue memory block (1j) and the switch output (6) is coupled to the comparator (4), wherein the polarity change block (2) and one switch input (6) are coupled to the comparator (4).