CN2364488Y

CN2364488Y - Microcomputer proportional valve controller

Info

Publication number: CN2364488Y
Application number: CN 99200044
Authority: CN
Inventors: 田青来; 朱国雄
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-01-04
Filing date: 1999-01-04
Publication date: 2000-02-16
Anticipated expiration: 2009-01-04

Abstract

The utility model relates to a microcomputer proportional valve controller, which is composed of an outer casing, a control board and a power panel. The control board comprises a switch gating input circuit, a monolithic computer control circuit, a key board display circuit and an output driving circuit. The monolithic computer control circuit is composed of a monolithic computer, a watchdog chip for power-on resetting / power-down detection, a serial communication interface chip and a programmable logic chip. An input port, an address port and a data port of the monolithic computer are respectively connected with the output end of the switch gating input circuit, the segment code control end of the display circuit and the input end of the programmable logic chip. The output end of the programmable logic chip is connected with the input end of the output driving circuit, the bit code control end of the display circuit and the control end of the key board display. The utility model has the advantage of simple operation, can substitute for a proportional valve controller composed of discrete components, and can be used in a hydraulic control system.

Description

The micro computer proportional valve controller

The utility model relates to proportional valve controller, particularly a kind of proportional valve controller of microcomputerized control.

Proportioning valve is a kind of hydraulic system that is widely used in, the hydraulic control component of controlled pressure, flow, and its principle of work is according to automatically controlled signal controlled pressure or flow in proportion.Proportional valve controller commonly used is the analog control circuit that is made of several discrete components, after the amplification of this mimic channel of automatically controlled signal process, computing, nonlinear compensation, zero point drift etc. are handled, the work that produces PWM (pulse-length modulation) signal controlling proportioning valve.Because this control circuit is made of discrete component, so its operating characteristic instability, output accuracy are low, reliability is low, circuit is complicated.

In view of above-mentioned, the purpose of this utility model just is to overcome the shortcoming that prior art exists, and the proportional valve controller that a kind of circuit structure is simple, reliability is high, operating characteristic is stable, output accuracy is high and simple to operate is provided.

For achieving the above object, the utility model is by the following technical solutions:

A kind of micro computer proportional valve controller is made of shell, control panel, power panel, and control panel comprises switching gate input circuit, single chip machine controlling circuit, keyboard-display circuit, output driving circuit, it is characterized in that:

Single chip machine controlling circuit is made of single-chip microcomputer, electrification reset/detection of power loss watchdog chip, serial communication interface chip, programmable logic chip;

The output terminal of switching gate input circuit links to each other with an input port of single-chip microcomputer;

The address mouth of single-chip microcomputer links to each other with the segment encode control end of display circuit;

The data port of single-chip microcomputer links to each other with the input end of programmable logic chip;

One of output terminal of programmable logic chip links to each other with the input end of output driving circuit, and all the other output terminals link to each other with the bit code control end of display circuit and the control end of keyboard circuit.

The utility model is compared with conventional proportional valve controller, has the incomparable advantage of following several respects:

1. circuit structure is simple, and the component number of use is few, and production technology is simplified, reliability improves thereby make;

2. substitute the functions such as combination, computing, timing of mimic channel with the digital operation mode, make that the controller operating characteristic is stable, the output accuracy raising;

3. carry out multiple spot, nonlinear compensation with computing machine, can guarantee that the input ratio is consistent in the gamut internal linear with proportioning valve output;

4. can recording storage organize parameter to adapt to the different working condition requirement of hydraulic system, convenient actual the use more;

5. have the computing machine communication interface of standard, can connect machine, provide the basis for realizing system-level computer controlled automatic with host computer;

6. adopt the panel mounted instrument structure, installation is simple, operation interface is concentrated.

Below in conjunction with drawings and Examples the utility model is elaborated.

Fig. 1 is circuit theory diagrams of the present utility model.

The utility model is made of shell, control panel, power panel.

See also Fig. 1.Control circuit comprises switching gate input circuit, single chip machine controlling circuit, output driving circuit, keyboard-display circuit four parts.Wherein:

The switching gate input circuit is made of input terminal J1, current-limiting resistance R10～R17, optocoupler A2A～A2D and A3A～A3D, exclusion S1, and they constitute eight tunnel input channels.

Single chip machine controlling circuit comprises Chip Microcomputer A 1 (uPD78C43), electrification reset/detection of power loss watchdog chip A4 (MAX8132), serial communication interface chip A6 (75156), programmable logic chip A7 (EPM201).Wherein: the output terminal FPO of A4 links to each other with the interruption pin INT1 of A1; Input end R, the D of A6 links to each other with serial communication interface SI, the SO of A1, and output terminal IN+, the IN-of A6 can link to each other with host computer, provides the basis for realizing computer controlled automatic; Input port I1～I7 of A7 links to each other with data port DB0～DB6 of A1.The core of this circuit is Chip Microcomputer A 1, programmable logic chip A7 and the program that is stored in single-chip microcomputer inside, the many groups of storage parameter in the internal memory of single-chip microcomputer, and every group of parameter comprises: each section preset proportion number, time delay, non-linear modified value etc.

Keyboard-display circuit comprises button K1～K4, five LED charactron L11～L15, light emitting diode L16～L18.Output driving circuit comprises resistance R 19～R21, triode N2 (TIP41C), diode D2 and D3, capacitor C 6.

Each input end of switching gate input circuit links to each other with outside automatically controlled signal by input terminal J1, and the output terminal K0～K7 of switching gate input circuit links to each other with the P1 mouth of Chip Microcomputer A 1; The segment encode control end A～G and the DP of each LED charactron of address mouth A0～A7 and display circuit of Chip Microcomputer A 1 link to each other; The data terminal DB7 of Chip Microcomputer A 1 connects the common port of button K1～K4; The data output end 02～07 of programmable logic chip A7 links to each other with the control end of button K1～K4, links to each other with the bit code control end of display circuit LED charactron and the control end of light emitting diode simultaneously; The data output end 01 of A7 links to each other with the input end R21 of output driving circuit, and it is that proportioning valve links to each other that output terminal PWMOUT+, the PWMOUT-of output driving circuit is used for load.

Principle of work of the present utility model is:

After system powered on, Chip Microcomputer A 1 was started working.When outside automatically controlled signal makes a certain road of switching gate input circuit import when effective, this signal just enters Chip Microcomputer A 1.Chip Microcomputer A 1 is corresponding to the ratio value of this automatically controlled signal in the invoke memory, to its time-delay timing of carrying out nonlinear compensation and being input to output, produce corresponding pwm signal, DB0 sends by data terminal, through programmable logic chip A7, then produce the PWM electric current and go to drive proportioning valve work again by output driving circuit.Thereby realized being input to the function such as time-delay timing, the calculating of proportioning valve nonlinear compensation, PWM generation of output with digital form.

The user can revise some parameter in Chip Microcomputer A 1 internal memory by keyboard circuit, as: the ratio value of setting each section switching gate correspondence; Set the non-linear modified value of multiple spot; Set the input delay time.Single-chip microcomputer shows relevant data according to user's needs by display circuit.

Power panel of the present utility model comprise rectifier bridge B2 ,+18V voltage stabilizing chips W 2 (LM317L) ,+5V voltage stabilizing chips W 3 (LM317) and corresponding resistance capacitance thereof, it mainly be for control panel provide+5V and+the 18V working power.

The utility model adopts the panel mounted instrument structure, is convenient to install.

Below only be preferred embodiment of the present utility model, anyly be equal to replacement based on of the present utility model, all should be within protection domain of the present utility model.

Claims

1. a micro computer proportional valve controller is made of shell, control panel, power panel, and control panel comprises switching gate input circuit, single chip machine controlling circuit, keyboard-display circuit, four parts of output driving circuit, it is characterized in that:

2. micro computer proportional valve controller as claimed in claim 1 is characterized in that:

Described serial communication interface chip connects the serial communication interface of single-chip microcomputer, and the output terminal of described electrification reset/detection of power loss watchdog chip connects first of single-chip microcomputer and interrupts pin.