SU1575277A1 - Master oscillator of multistep quasisinusoidal voltage - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to converter technology, and can be used in frequency converter control systems. The aim of the invention is to simplify the device. The operation of the device is based on a stepwise approximation of sinusoidal voltage. The device contains 1 clock pulse generator, binary counter 5, digital-to-analog converter 10, controlled code inverter 7, sinusoidal function converter 14, RS flip-flop 4, T-flip-flop 11, inverting and summing amplifiers 12.13

binary counter 5 is reversible. The generator is formed by the formation of a stepped quasi-triangular bipolar voltage transformed into a quasi-sinusoidal. The device allows you to adjust the shape of the output voltage. 2 Il.

Description

one

(21) 4293605 / 24-07

(22) 03.08,87

(46) 06/30/90. Bup. 24

(71) Kommunarsk Mining and Metallurgical Institute

(72) Ao.Puzakov, A „B„ Ostapchuk and T.B.Ostapchuk

(53) 621 „314-27 (088„ 8)

(56) Goldenberg L „H0 Pulse devices. - M .: Radio and communication, 1981, p.197,

(54) TARGET GENERATOR OF MULTISTAGE QUASISINUSIDOID VOLTAGE

(57) The invention relates to electrical engineering, in particular, to converter technology, and can be used in frequency converter control systems. The object of the invention is to simplify the device. The device is based on the stepwise approximation of sinusoidal voltage. The device contains 1 clock pulse generator. , binary counter 5, digital-to-analog converter 10, controlled inverter 7 code, sinusoidal function converter 14, RS flip-flop 4, T-flip-flop II, inverter and with Amplifying amplifiers 12, 13, a binary counter 5 is made reversible. The generator performs the formation of a stepped quasi-triangular bipolar voltage converted to a quasisinusoidal device. The device allows you to adjust the shape of the output voltage, 2 or

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The invention relates to electrical engineering, in particular, to converter technology, and can be used as a generator of a driving signal when controlling static frequency converters.

The purpose of the invention is to simplify the device.

FIG. 01 is a diagram of the master oscillator; 2, timing diagrams explaining the operation of the device, where U,, U4,%, U, U fe, U, U are the signals at the outputs

The device contains a generator of 1 clock pulses, elements 2 and 3 AND, RS-trigger 4, reversible counter 5, element 6 AND, controlled inverter 7 code, element 8 OR-NOT, source 9 of the reference voltage, digital-to-analog converter 10, T- trigger 11, inverting amplifier 12, summing amplifier 13, functional converter 14 o

The output of the generator 1 is connected to the first inputs of elements 2 and 3, the outputs of which are connected to the inputs of the reversible counter 50 The outputs of the reversible counter 5 are connected to the inputs of the inverter 7 and the inputs of element 6 and element 8. The output of element b is connected to the R-input of the short-circuit trigger 4, the outputs of which are connected to the second inputs of elements 2 and 3, the S input of the trigger 4 is connected to the output of element 8 and the input of the trigger 11, the output of which is connected to the control input of the inverter 7 and the control input of the digital-analog converter 10, associated with source 9, and the output of the digital-analog converter 10 through inverting amplifier 12 is connected to one of the inputs of amplifier 13, summing the output voltages of digital-analog converter 10 and source 9, the output of the same summing amplifier 13 is connected to the output terminal of the device through a functional converter 14 with sinusoidal dependence

The controlled inverter code 7 does not change the input code when the signal at its control input is zero and inverts the input code when one is applied.

nice Functional converter 14 for input voltages - U Ugx

UMC) KC implements a sinusoidal dependence in accordance with the expression

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The device works as follows

At the initial moment of time, the reversible counter 5 is zeroed, and the trigger 4 is in state 1 (FIG 2) under the action of the level from the output of the element 80. At this, element 3 is closed, and element 2 is open and the clock pulses from the output of generator 1 are fed to the input of the reverse counter 5 Under the action of clock pulses at the output of the reversing counter 5, a linearly increasing binary code is generated (). Suppose that the initial trigger 11 is in the zero state Under the action of the level at the control input of the inverter 7 the last does not invert the incoming code. The level of the log.O at the control input is the sign of the output voltage of the D / A converter corresponds to the formation of a positive voltage. In this case, a quasilinear step positive voltage is formed at the input of summing amplifier 13 (Fig. 02). This voltage is converted into quasi-sinusoidal by means of the functional transducer 14. Thus, an increasing part of the output voltage is formed. When the reversing counter 5 is completely filled, the output of element 6 gives rise to a level log. 1, which transfers the trigger 4 to the opposite state, and therefore subsequent clock pulses enter the subtraction input of the reversible counter 5 falling part of the output quasi-sinusoidal voltage. When resetting the counter 5, the state of the trigger 4 changes again, but already under the action of the level from the output of the element 8. The same signal changes the state of the trigger 11, which supplies a code inverting signal for the inverter 7 and forming the negative output voltage of the device. processes are similar

The device makes it possible, with simple means, to ensure the correction of its form by reconstructing a functional converter when forming a stable output voltage.

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Claims (1)

The formula of the invention and a summing amplifier, wherein the output generator is a multi-stage quasi-sinusoidal voltage, comprising a digital-to-analog converter, the reference input of which is connected to a reference voltage source, a clock pulse generator and a binary counter, characterized in that, for simplification, it is equipped with three AND elements controlled by an inverter code, functional converter that implements the function U _8bt x = and О в £ п (~ ^в - * - - /// 2), and LASYAKS where and are the input and output voltage of the functional converter; Umax “maximum value of U _in ; U _o - the maximum value of U _etlX , RS-trigger, element OR-NOT, Trigger, inverting amplifier, the clock pulse generator is connected to the first inputs of the first and second elements And, the second inputs 5 of which are connected to the outputs of the RS-flip-flop, the outputs - with the inputs of addition and subtraction of a reversible counter, the outputs of which are connected to the inputs up1Q of the equal code inverter and to the inputs of the third element AND and the OR-NOT element, the output of which is connected to the S-input of the RS-flip-flop and through the T-trigger - with the output control input sign 15 voltage of the digital-to-analog converter and the control input of the code inverter, the R-input of the RS-trigger is connected to the output of the third element And, the output of the digital-to-analog converter 20 through an inverting amplifier is connected to the first input of the summing amplifier, the second input of which is connected to a reference voltage source, the output of the summing amplifier is connected to the input of the functional converter, the output of which is the output of the master oscillator.