RU2621836C1 - Tachometer pulse former - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: pulse former contains microcontrollers, a galvanic isolation unit, power converters, voltage regulators, supply voltage inputs and tachometer signal inputs. Also, the former contains programmable microcontrollers and controlled switches, while the microcontrollers analyze the input signal and set a certain operating threshold depending on the result of the analysis.

EFFECT: increased flexibility of the tachometer pulse former functioning by providing adaptation of the operating threshold, depending on the input signal.

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Description

Technical field

The present invention relates to converters of signals from tachometric sensors for their conversion into rectangular pulses with a period corresponding to the period of the received signal and can be used to ensure the operation of separately functioning systems for monitoring the parameters of industrial units, for example: power equipment of gas and oil pumping stations; power plants of thermal power plants; switching pipelines of nuclear power plants; fans, pumps, compressors, boilers, pipelines, etc.

State of the art

The prior art pulse shaper of the tachometer FR-02, containing inputs of the supply voltage, tachometric sensor signal inputs, a microcontroller, a galvanic isolation unit, the converted signal outputs and further adopted as the closest analogue of the proposed invention (http: //www.all-pribors .ru / docs / 25033-09.pdf), 2009.

The specified analogue ensures the reception of a monotonous signal at half-cycle from the tachometric sensors, and converts it into rectangular current pulses with a period corresponding to the period of the received signal.

The pulses received at the output of the shaper are then used to control the parameters of the units on which the tachometric sensors are located.

The known shaper has a drawback in the form of insufficient flexibility of operation, since it lacks the ability to adapt the response threshold depending on the input signal.

The proposed invention is aimed at overcoming this drawback and provides a technical result, which consists in increasing the flexibility of the functioning of the decoupling shaper.

Disclosure of invention

To ensure the above technical result, a tachometer pulse shaper (FIT) is proposed, which contains power voltage inputs, tachometric sensor signal inputs, a microcontroller, galvanic isolation unit, converted signal outputs, while the second and third microcontrollers, controlled keys, second and the third galvanic isolation blocks, power converters, voltage regulators, while the voltage inputs are connected to the corresponding inputs of the conversion power supply units, each of which serves to power the corresponding galvanic isolation unit, the outputs of each of the power converters are connected to their respective inputs of the voltage regulators, each of which serves to power the corresponding microcontroller, while the tachometric sensor signal inputs are connected to the corresponding inputs of the microcontrollers, output each microcontroller is connected through a corresponding controlled key to the corresponding galvanic isolation unit, each of which s is connected to the corresponding output the converted signal, wherein each microcontroller further comprises a connector for programming the microcontroller.

In additional embodiments, transistors are used as controlled keys, and optocouplers are used as galvanic isolation blocks, jumpers are installed at the inputs of the tachometric sensors and / or at the outputs of the converted signal, the presence of the signal at the outputs of the converted signal is determined by means of LEDs.

The implementation of the invention

The following description is intended to disclose the functioning of the proposed invention with the provision of a technical result and contains information allowing a specialist to carry out the invention.

Description is made with reference to the position of FIG. 1, which is a block diagram of an illustrative embodiment of the invention.

The proposed shaper works as follows.

The input (01-03) two-pin connectors (signal inputs) of the driver are fed with signals generated by tachometric sensors. In an advantageous embodiment, each microcontroller (30-32) is connected to a corresponding signal input and is configured to receive signals through a corresponding FIT channel. Microcontrollers, which are part of the shaper, digitize and analyze the received signals. The output signals from the microcontrollers obtained as a result of processing are supplied to the controlled keys corresponding to each microcontroller (40-42), mainly made in the form of transistor keys, which are closed when the signal passes through them with the value specified by the microcontroller. From the output of the keys, the signals are supplied to the galvanic isolation blocks (50-52) corresponding to each controlled key, mainly made in the form of optocouplers, where the signal amplification and isolation of the outputs of the driver (6-8) (outputs of the converted signal) are grouped in the output connector (04 )

The supply voltage (U) from an external source (mainly 24 V, 80 mA) is also supplied to the input of the driver, the power supply inputs are connected to the corresponding inputs of the power converters (10-12), which reduce the voltage (mainly to 5 V) and provide power for their respective galvanic isolation blocks. If there are three galvanic isolation units, respectively, it is necessary to use three voltage converters, each of which is connected by power to the corresponding galvanic isolation unit.

Moreover, each of these voltage converters is configured to be connected by power to a voltage regulator corresponding to it (20-22), in which the voltage decreases and stabilizes at a value of 3.3 V. As such regulators, regulators known from the prior art can be used, for example , regulators of the MCP1702 family.

Each of these voltage regulators is designed to power one microcontroller corresponding to it and has a power connection with it. As microcontrollers, microcontrollers of the PIC24H family are preferably used.

To simplify the description of the block diagram, the common wire (ground) used to provide power to all of the above components of the device, in FIG. 1 is not shown, but it is intended to be used in an obviously known manner.

Each of these microcontrollers is configured to program through the corresponding connectors (prog 0 - prog 2). At the same time, programming is performed in such a way that, depending on the results of processing the signal received from the tachometric sensors received by the microcontroller, to provide an output signal of a certain size that triggers the operation of the corresponding keys, which ensures the adaptation of the response threshold depending on the input signal. For example, adjusting the response threshold can be performed in two stages: the step of highlighting the signal band in which the signal of a particular sensor is located, eliminating short-term pulses that can lead to false triggering, and the step of estimating the average signal level with the search for regular peaks above the average level. In accordance with the amplitude of the detected signal, the response threshold is adapted.

The proposed invention additionally provides for the possibility of switching the input and output electric circuits of the driver using jumpers (jumpers) to change some parameters of the electric circuit, such as input resistance, range of analysis of input signals, permissible (constant, RMS) input voltage, permissible pulse input voltage. Jumpers can be installed at the output of tachometric signals also to change some characteristics of the electric circuit (output signal levels at a certain load resistance).

The proposed invention also provides the ability to verify the presence of output signals at each output of the driver, as well as the presence of a supply voltage by connecting the corresponding LEDs in a manner known from the prior art.

The above information allows a specialist to evaluate the advantages of the proposed invention and to carry out its implementation with the achievement of the above technical result.

Claims (4)

1. A tachometer pulse shaper containing voltage supply inputs, tachometric sensor signal inputs, a microcontroller, a galvanic isolation unit, converted signal outputs, characterized in that the second and third microcontrollers, controlled keys, second and third galvanic isolation blocks, and converters are additionally introduced into it power, voltage regulators, while the power supply inputs are connected to the corresponding inputs of the power converters, each of which serves to supply of the galvanic isolation unit, the outputs of each of the power converters are connected to the corresponding inputs of the voltage regulators, each of which serves to power the corresponding microcontroller, while the tachometric sensor signal inputs are connected to the corresponding inputs of the microcontrollers, the output of each microcontroller is connected to the corresponding controlled key galvanic isolation unit, each of which is connected to the corresponding output of the converted signal ala, with each microcontroller additionally contains a connector for programming the microcontroller. 2. The shaper according to claim 1, characterized in that transistors are used as controlled keys, and optocouplers are used as galvanic isolation blocks. 3. The shaper according to claim 1, characterized in that jumpers are installed at the inputs of the tachometric sensors and / or at the outputs of the converted signal to configure the parameters of the electric circuit. 4. The driver according to claim 1, characterized in that it further comprises LEDs configured to determine the presence of a signal at the outputs of the converted signal and the presence of a supply voltage.

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