SU1480087A1 - Controlled two-phase generator of triangular waveforms - Google Patents

Abstract

The invention relates to a pulse technique and can be used in control units for frequency converter units. The purpose of the invention is to expand the range of output frequencies by reducing the minimum output frequency. The generator containing the control voltage source 1, the switches 2, 8 with a change of the output voltage sign, the integrator 3 and the comparator 4 are entered into the comparator 5, the coincidence element 6 and the adder 7. The triangular voltage from the bus 9 is summed by the adder 7 with by the square pulses from the output of the comparator 5. The total voltage is converted by the switch 8, the controlled element 6, into a triangular voltage, shifted in phase by 90 °, regardless of frequency. 2 Il.

Description

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The invention relates to a pulse technique and can be used, for example, in control units of valve converters.

The purpose of the invention is to expand the range of output frequencies by reducing the minimum output frequency.

Figure 1 shows the structural scheme of a controlled two-phase triangular oscillator; FIG. 2 shows timing charts of its operation.

The controlled two-phase generator of triangular oscillations contains a source of control voltage 1, a first switch 2 with a change of sign of the output voltage, an integrator 3, a first comparator 4, a second comparator 5, a coincidence element 6, an adder 7, a second switch 8 with a change of sign output voltage, first and second, output tires 9, 10.

Source 1, first switch 2 and integrator 3 are connected in series. The output of the integrator 3 is connected to the first output bus 9, with the first input of the adder 7 and the inputs of the first and second comparators 4, 5. You run the second comparator 5 connected to the second input of the adder 7 and the first input of the element 6, the second input of which is connected to the output of the first comparator 4 and the control input of the first switch 2, and the output from the control input of the second switch 8, the input of which is connected to the output of the adder 7, and the output to the second output bus 10.

The generator works as follows.

The control voltage from source 1 is fed to the input of the first switch 2, the output voltage of which is fed to the input of integrator 3. The linearly varying voltage of integrator 3 (Fig. 2a) is fed to the input of the first comparator 4. When the output voltage of the integrator 3 reaches the operation level of the first comparator 4, the output voltage of the latter (Fig. 26) entering the control input of the first switch 2 changes its polarity abruptly, the sign of the transfer coefficient of the first switch 2 changes, and the output voltage of the inte Grator 3 is changing

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in the opposite direction. The frequency of the output voltage of the integrator 3 is determined by the voltage at the output of source 1. The output voltage of integrator 3 is also fed to the input of the second comparator 5. At the output of the second comparator 5 (Fig. 2b), the voltage is shifted out of phase at 90e relative to the output the voltage of the integrator 3. The output voltage of the second comparator 5 is fed to the first input of element 6, the second input of which receives the output voltage of the first comparator 4. Element 6 produces a negative polarity of voltage the fall of the voltage levels at its inputs (Figure 2d). The output voltage of the integrator 3 is also fed to the first input of the adder 7, the second input of which receives the output voltage of the second comparator 5. The output voltage of the adder 7 (fig.2d) is fed to the input of the second switch 8, to the control input of which the output voltage enters Element 6, When the voltage level at the control input of the second switch 8 changes, the sign of its transmission coefficient changes, as a result of which a triangular voltage is formed at its output (Figure 2e) shifted by 90 ° relative to the triangular voltage. Apr at the output of the integrator 3.

A controlled two-phase triangular oscillator provides, compared with the prototype device, the generation of phase-shifted triangular voltages of lower frequency. The phase shift of the output voltages is 90 ° and does not depend on the frequency of the output voltages.

Claims (1)

Invention Formula A controlled two-phase triangular oscillation generator containing a series-connected control voltage source, a first switch with a change of sign of the output voltage, an integrator; the first comparator, the output of which is connected to the control input of the first switch with a change of the output voltage sign, and the second switch with the change of the sign of the output voltage, and the integrator's output is connected to the first output bus, so that that, in order to expand the output frequency range by reducing the minimum output frequency, a second comparator, a matching element and an adder are entered into it, the integrator output is connected to the input of the second comparator and to the first input of the adder, the output of the second the comparator is connected to the first LJ U U U U U L PhmMhhMh the input of the coincidence element, to the second input of which the output of the first comparator is connected, while the output of the adder is connected to the input of the second switchboard by changing the sign of the output voltage, the output of which is connected to the second output bus, and the control input is connected to the output of the coincidence element. hhh / N / to 2 /