CN201153211Y

CN201153211Y - Phase loss protection unit for intelligent electric actuating mechanism

Info

Publication number: CN201153211Y
Application number: CNU2007200979050U
Authority: CN
Inventors: 赵辉; 岳有军; 王红君
Original assignee: Tianjin University of Technology
Current assignee: Tianjin University of Technology
Priority date: 2007-11-21
Filing date: 2007-11-21
Publication date: 2008-11-19
Anticipated expiration: 2017-11-21

Abstract

The utility model relates to a low cost phase lacking protecting unit of an intelligent electric operator, which can enhance the reliability of the electric operator. The phase lacking protecting unit researches the applied computer control technology at first, an intelligent embedded microcontroller with a high performance-price ratio is ensured to implement three-phase voltage detection and process phase lacking judgment and a design proposal of phase lacking protection adapting to the electric operator is designed: at first a 12F675 which is a 8 bits singlechip of Microchip company is utilized to implement three-phase voltage signal detection and phase lacking judgment; the electric operator is ensured to have preferable reliability; the electric operator is ensured to adapt to the requirement of development of the modern industry in a preferable way. The phase lacking protecting unit of the intelligent electric operator comprises a voltage sampling and wave filtering circuit, a phase lacking judgment circuit and an alarming output circuit in turn. The three-phase voltage is converted to detectable weak voltage signals by the voltage sampling and the wave filtering, and then the weak voltage signals are sampled by an A/D conversion module on a chip with 10 bits precision arranged in the 12F675 to judge whether phase lacking circumstance occurs, and the phase lacking alarming signal is output by the alarming output circuit.

Description

The intelligent electric actuating mechanism phase-lacking protective unit

[technical field]:

The utility model belongs to industrial instrument control technology field, realizes a kind of electric operator open-phase protection function.

[background technology]:

Electric operator series is a Terminal Type control instrument, is widely used in industries such as large-size chemical, oil, metallurgy, electric power pressure, flow, temperature are regulated.Electric operator is the visual plant in the industrial process control, it receives the analog signal (generally being 4～20mA current signal) of self tuning regulator or the digital signal of host computer, and be converted into electric operator corresponding angular or straight-line displacement output, go to drive actions such as valve, baffle plate, to realize automatic control to various procedure parameters.Along with the raising day by day of domestic industry automatization level, also more and more higher to the requirement of electric operator technical performance, the Intellectualized electric actuator that presses for a new generation replaces the product of use at present, to improve automaticity and production efficiency.

[summary of the invention]:

The purpose of this utility model is to provide a kind of phase-lacking protective unit of electric operator cheaply, improves the electric operator reliability.

The utility model is at first studied the application Control Technique of Microcomputer; the embedded microcontroller that the usability price ratio is high is realized the detection of three-phase voltage; carrying out phase shortage judges; design is applicable to the open-phase protection design of electric operator; utilize 8 single-chip microcomputer 12F675 of Microchip company; realize the detection and the phase shortage judgement of three-phase voltage signal, guarantee that electric operator has reliability level preferably, make electric operator better adapt to the development of modern industry requirement.

The intelligent electric actuating mechanism phase-lacking protective unit that the utility model provides comprises successively: voltage sampling and filtering, phase shortage are judged, the warning output circuit is formed.

Above-mentioned said voltage sampling and filter circuit (accompanying drawing 3) comprise successively:

1) bleeder circuit and AC-to-DC change-over circuit: the series resistance dividing potential drop of employing is that detectable light current is pressed signal and is converted to d. c. voltage signal by rectification circuit with the three-phase alternating voltage conversion of signals.

2) filter circuit: voltage fluctuation that exists in the filtered signal and high frequency components.

Above-mentioned said phase shortage is judged (accompanying drawing 4): be made of A/D modular converter on the sheet of 8 single-chip microcomputer 12F675 of Microchip company and built-in 10 precision thereof.

Above-mentioned said warning output circuit (accompanying drawing 4): alarm signal is exported to the intelligent electric actuating mechanism control unit through photoelectric isolating circuit, and report to the police by lumination of light emitting diode.

Advantage of the present utility model and good effect:

1, the utility model hardware circuit is simple and reliable, the detection phase of three-phase voltage is safe and reliable, can improve the reliability of device;

2,8 single-chip microcomputer 12F675 of the embedded microcontroller that the utility model usability price ratio is high realize the phase shortage judgement, improve the electric actuator intelligent level.

[description of drawings]:

Fig. 1 is the overall structure block diagram of the related intelligent electric actuating mechanism of the utility model.

Fig. 2 is the phase-lacking protective unit structured flowchart that the utility model provides.

Fig. 3 is voltage sampling and filter circuit construction schematic diagram.

Fig. 4 is that the related phase shortage of the utility model is judged and warning output circuit structure schematic diagram.

[embodiment]:

Embodiment 1:

A kind of intelligent electric actuating mechanism phase-lacking protective unit (seeing Fig. 1, Fig. 2), it adopts 8 single-chip microcomputer 12F675 of the high embedded microcontroller of cost performance to realize the phase shortage judgement, improves the electric actuator intelligent level.Whole device is made up of voltage sampling and filter circuit, phase shortage judgement, warning output circuit successively, and wherein, voltage sampling and filter circuit (accompanying drawing 3) comprising: bleeder circuit and AC-to-DC change-over circuit, filter circuit.Three-phase alternating current is converted to 3 road 4V direct voltages through bleeder circuit and AC-to-DC change-over circuit with 3 road 220V alternating voltages.The voltage fluctuation and the High-frequency Interference of being invaded by electrical network guarantee the reliability that three-phase voltage detects in filter circuit filtering 3 road d. c. voltage signals.

Above-mentioned said phase shortage is judged (accompanying drawing 4): be made of A/D modular converter on the sheet of 8 single-chip microcomputer 12F675 of Microchip company and built-in 10 precision thereof.Single-chip microcomputer is by A/D modular converter timing acquiring three-phase voltage, and the three-phase voltage that collects compared, get rid of that the electrical network threephase load is unbalanced, have heavy load to start the influence to three-phase voltage such as the factor that causes voltage ripple of power network in the grid voltage waveform distortion, electrical network, if a certain phase or two phase electricity force down in preset threshold in the three-phase voltage, then be judged as phase shortage, to intelligent electric actuating mechanism control unit output alarm signal, electric operator is out of service.When being in non-full-phase state, single-chip microcomputer continues the timing acquiring three-phase voltage, if power system restoration is normally then eliminated alarm signal.

Above-mentioned said warning output circuit (accompanying drawing 4): alarm signal is exported to the intelligent electric actuating mechanism control unit through photoelectric isolating circuit, and is reported to the police by lumination of light emitting diode.

Claims

1, a kind of intelligent electric actuating mechanism phase-lacking protective unit is characterized in that, this phase-lacking protective unit comprises successively: voltage sampling and filter circuit, phase shortage decision circuitry, and the warning output circuit form.

2, intelligent electric actuating mechanism phase-lacking protective unit according to claim 1 is characterized in that, described voltage sampling and filter circuit comprise successively: bleeder circuit and AC-to-DC change-over circuit, filter circuit; The series resistance dividing potential drop that bleeder circuit and AC-to-DC change-over circuit adopt is that detectable light current is pressed signal and is converted to d. c. voltage signal, the high frequency components that exists in the filter circuit filtered signal by rectification circuit with the three-phase alternating voltage conversion of signals.

3, according to the said intelligent electric actuating mechanism phase-lacking protective unit of claim 1; it is characterized in that; phase shortage is judged by A/D modular converter on the sheet of 8 single-chip microcomputer 12F675 of Microchip company and built-in 10 precision thereof and is constituted; set the collection three-phase voltage signal by the volume software program, judge whether to take place phase shortage.

4, according to the said intelligent electric actuating mechanism phase-lacking protective unit of claim 1, it is characterized in that the warning output circuit: alarm signal is exported to the intelligent electric actuating mechanism control unit through photoelectric isolating circuit, and report to the police by lumination of light emitting diode.