SU1172014A1 - Pulse-frequency converter - Google Patents

Abstract

A FREQUENCY-PULSE CONVERTER containing an integrator whose input is connected to an input current source, and an output to the first inputs of the first, second and third comparators, a feedback pulse duration generator connected by its first and second pulse inputs to the outputs of the first and second comparators, and outputs - to the first and second inputs of the reversible pulse generator of the reference current, an inverting amplifier, a logic unit for generating output pulses, connected by its inputs to the output ter of its comparator and the outputs of the pulse duration generator, characterized in that, in order to expand its functionality, it additionally contains a hyperbolic voltage converter connected by its input from to the input voltage terminal, and by the output to the second input of the first com (L parator and through Invert the amplifier to the second input of the second comparator.

Description

The frequency-pulse converter is intended for use in devices of automation, telemechanics, and also in power engineering for determining power and consumption of electric energy. The purpose of the invention is to expand the functionality by the possibility of obtaining a frequency proportional to the product of alternating current and constant sign voltage. FIG. 1 shows a diagram of the proposed device; in fig. 2 stress diagrams; in fig. 3 - n riant of the hyperbolic voltage transformer scheme. The device contains an integrator 1 connected by its input to an input current source 2, and an output to the first inputs of the first 3, second 4 and third 5 comparators, a feedback pulse width generator 6 connected by its pulse inputs to the outputs of the first 3 and second 4 comparators, and outputs to the first and second inputs of the reversible generator 7 pulses of the reference current; lsov. In addition, the proposed converter additionally contains a hyperbolic voltage converter 9 connected by its input to the input voltage terminal 10, and an output to the second input of the first comparator 3 and through the inverting amplifier 11 to the second input of the second comparator 4, while The feedback pulse power generator 6 uses a hyperbolic voltage-to-pulse voltage converter connected by its analog input to terminal 10 of the input voltage. The Converter operates as follows. The input current (Fig. 2q) through the source 2 terminal is fed to the input of integrator 1. If the input current is negative, the voltage at the integrator output rises until it reaches the first comparator 3 trigger level. The signal from the first comparator output starts at the first the pulse input is a hyperbolic voltage into pulse duration converter. The duration of the pulses at the output of the generator 6 is inversely proportional to the input voltage (Fig. 28), supplied. via terminal 10 to its analog input. A pulse from the first output of the converter controls the first input with a reversible generator 7 of the reference current, connecting it for the duration of the pulse to the input of the generator in the direction opposite to the input current. As a result, the voltage is reset at the output of the integrator (Fig. 26) in the negative direction. When changing the direction of the input current to the opposite one, the converter works in the same way, but the second comparator 4 is activated, the signal from the output of which is fed to. the second pulse input of the pulse generator 6, and the reversible pulse generator of the reference current supplies the integrator 1 with a current pulse, as a result of which the output voltage of the integrator changes in the positive direction. For normal operation of the converter, it is necessary that each pulse of the reference reset current triggers the third average comparator 5, but it does not allow the comparator to operate at the opposite level. For example, when triggering the first comparator 3 at the time of the completion of the reference reset, the voltage at the output of the integrator 1 must lie between the levels of the second 4 and third 5 comparator levels (Fig. 2B). For the fulfillment of the specified condition in the whole range of input voltages, the response levels of the first 3 and second 4 comparators are controlled. For this, the input voltage from terminal 10 is fed to the input of the hyperbolic voltage converter 9 and from the output of the latter to the second input of the first comparator 3. Similarly, the inverted amplifier 11 reverses the input voltage to the second input of the second comparator 4. The actuation levels of the first and second comparators are shown in FIG. 2 & dotted line. In the process of changing the input voltage, the response levels of the first and second com parators also change, which is proportional to the increment of the voltage on the integrator as a result of the reference reset, which ensures the conditions of normal operation. The signals from the output of the third comparator, as well as signals from the pulse outputs of the generator 6, are fed to the inputs of the logic unit 8 for generating output pulses. The generated output pulses are passed to one of two outputs 12 or 13 in accordance with the sign of the input current (Fig. 22, h). The logic unit 8 for generating output pulses is implemented similarly to the device 23. Block 6 can be made similar to a functionally known voltage to voltage converter. The accuracy of the implementation of the hyperbolic converter 9 may be low, with a deviation of about 15%. The output frequency is determined by the response times of the third central comparator and remains unchanged when the extreme comparators trigger levels are shifted within certain limits (Fig. 2B, section 12). Such low requirements make it easier to implement a hyperbolic voltage converter. For example, if the piecewise linear approximation of the hyperbolic conversion function on the operational amplifier (Fig. 3) is not available and the voltage divider can be obtained, the voltage conversion range D .Sl. Thus, the use of a hyperbolic voltage converter in the level control circuit. the operation of the first and second comparators, together with the use of a hyperbolic voltage-to-pulse-voltage transducer as a generator of feedback pulses, allows to obtain a frequency Terminal 1 is a product of alternating current and a constant voltage sign. At the same time, conversion accuracy is high, as is the case with the known device.

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Claims (1)

A FREQUENCY-PULSE CONVERTER containing an integrator, the input of which is connected to the input current source, and the output to the first inputs of the first, second and third comparators, a feedback pulse generator ₇ connected by its first and second pulse inputs to the outputs of the FIRST AND SECOND - comparators, and outputs - to the first and second inputs of the reversing pulse generator of the reference current, an inverting amplifier, a logic block for generating output pulses, connected by its inputs to the output of the third Oparator and pulse generator output, characterized in that, in order to expand the functionality, it additionally contains a hyperbolic voltage converter connected to the input terminal of the input voltage by its input and to the second input of the first comparator and through the inverting amplifier to the second input of the second comparator .