CN1051664C

CN1051664C - Analog magnetic field automatic adjustment control device

Info

Publication number: CN1051664C
Application number: CN 96104573
Authority: CN
Inventors: 谢一民
Original assignee: Yongshitai Science And Technology Co ltd
Current assignee: Yongshitai Science And Technology Co ltd
Priority date: 1996-04-05
Filing date: 1996-04-05
Publication date: 2000-04-19
Anticipated expiration: 2016-04-05
Also published as: CN1162140A

Abstract

An automatic adjustment control device for an analog magnetic field comprises: the magnetic field simulator is provided with three coils which are respectively controlled by the current output by the current generator to generate X, Y magnetic fields in the Z direction; the geomagnetic sensor senses a simulated Gaussian value of the magnetic field intensity in the magnetic field simulator; the analog-digital converter converts the analog Gaussian value into a digital signal which can be interpreted by the CPU and outputs the digital signal, and the digital signal is compared with a preset digital Gaussian value of the CPU to output a current control signal; and the D/A converter receives the current control signal output by the CPU and converts the current control signal into an analog signal so as to change the current quantity output by the current generator and further change the magnetic field in the magnetic field simulator.

Description

Analog magnetic field automatic regulating and controlling device

The present invention relates to a kind of analog magnetic field control device, particularly relate to a kind of analog magnetic field automatic regulating and controlling device.

At present in monitor (Monitor) production process, must set an analog magnetic field earlier, this be because display core---color picture tube (Color Tube) is subjected to the influence in magnetic field of the earth very big, therefore along with the difference in magnetic field, monitor sales territory, monitor factory must set up earlier one " analog magnetic field " on production line when producing, the absolute force of simulation locality, export area just can adjust perfect monitor.

But factory adjusts very time-consuming the taking a lot of work of work of analog magnetic field, need be one group with two people, one people monitors Gauss's value of gaussmeter, and another people adjusts the current strength of the current generator output of analog magnetic field, so, not only time-consuming taking a lot of work, and be easy to generate artificial error.

The object of the present invention is to provide a kind of analog magnetic field automatic regulating and controlling device, can make things convenient for the production engineer of factory to adjust magnetic field fast, correctly and economically, to reach the purpose of factory automation.

The invention is characterized in: this analog magnetic field automatic regulating and controlling device utilizes a microcomputer that is preset with the absolute force value of locality, export area, with Gauss's value and its comparison that is received from the output of earth magnetism sensor, and comparative result delivered to current generator, constantly change the current value of output, to revise the intensity of analog magnetic field, till Gauss's value of this gaussmeter output meets absolute force value default in the microcomputer fully.

Analog magnetic field automatic regulating and controlling device of the present invention, comprise a magnetic simulation device, one earth magnetism sensor, one analog-digital converter, one CPU and a digital-analog converter, this magnetic simulation device comprises three coils, accept the Current Control of current generator output respectively, and in this magnetic simulation device, produce X, magnetic field on Y and the Z direction, this earth magnetism sensor is used in this magnetic simulation device of sensing X in the center, the simulation Gauss value of magnetic field intensity on Y and the Z direction, the convertible above-mentioned simulation Gauss value of this analog-digital converter becomes the digital signal output that CPU (CPU) can interpretation, this CPU has an interpretation program at least, with X in default this magnetic simulation device, digital Gauss's value of magnetic field intensity on Y and the Z direction, and by means of this interpretation program, the digital signal of above-mentioned analog-digital converter output is made comparisons with default digital Gauss's value, and export a current controling signal, this D-A converter can receive the current controling signal of above-mentioned CPU output, convert current generator acceptable analog signal to, changing the magnitude of current of this current generator output, and then change X in the magnetic simulation device, magnetic field on Y and the Z direction.

The present invention is described in detail below in conjunction with drawings and Examples:

Fig. 1 is the circuit block diagram of preferred embodiment of the present invention.

Fig. 2 is the operational flowchart of the interior interpretation program of CPU among Fig. 1.

As shown in Figure 1, circuit block diagram for preferred embodiment of the present invention, this analog magnetic field automatic regulating and controlling device comprises a magnetic simulation device 1, an earth magnetism sensor 3, an analog-digital converter 4, a CPU (CPU) 5 and a digital-analog converter 6, this magnetic simulation device mainly is to accept the Current Control of a current generator 2 outputs respectively by three

coils

10,11,12, and produces the magnetic field on X, Y and the Z direction in this magnetic simulation device 1.This earth magnetism sensor 3 is used in the above-mentioned magnetic simulation device of sensing in the center simulation Gauss value of magnetic field intensity on X, the Y and Z direction.This analog-digital converter 4, be used for converting above-mentioned simulation Gauss value to digital signal that CPU5 can interpretation in this preferred embodiment, above-mentioned earth magnetism sensor 3 and analog-digital converter 4 can adopt existing global positioning system (G1obal Position System; GPS), the global positioning system that for example global positioning system of the model TCM2 of PNI company, or GARMAN company is produced, and place center in the magnetic simulation device 1, and,, be connected to this CPU5 as RS-232 with the numerical digit transmission line.This CPU5 has an interpretation program at least, also just as shown in Figure 2, behind this interpretation program start, X in the above-mentioned magnetic simulation device is set in keyboard 7 inputs that the user can utilize this CPU5 to connect, digital Gauss's value IG of magnetic field intensity on Y and the Z direction, then, this CPU5 just can read above-mentioned earth magnetism sensor 3 outputs and the digital Gauss's value CG after analog-digital converter 4 conversions, and compare with the above-mentioned digital Gauss's value IG that sets, when comparative result is CG＞IG, this CPU5 just exports one and reduces the digital controlled signal of electric current to this digital-analog converter 6, to convert above-mentioned current generator 2 acceptable analog signals to, and reduce the magnitude of current of this current generator 2 outputs, on the contrary, when CG＜IG, this CPU5 then exports a digital controlled signal digital-analog converter 6 that increases electric current, in like manner converts this current generator 2 acceptable analog signals to, to increase the magnitude of current of these current generator 2 outputs, so recycle ratio arrives till this CG=IG.

In addition, above-mentioned CPU5 more can connect a display 8, is used for showing Gauss's value that this CPU5 is read from above-mentioned earth magnetism sensor 3, knows for the user and understands Gauss's value that this earth magnetism sensor 3 was surveyed at that time.

By above-mentioned structure, after the user needed only Gauss's value of the absolute force that configures the locality, export area in CPU5, each magnetic simulation device 1 just can be adjusted to the absolute force that meets this setting automatically, quickly and accurately.And after removing above-mentioned earth magnetism sensor 3, the user can utilize this magnetic simulation device 1 to adjust perfect monitor (Monitor), and reach save time, saving of labor and accurate purpose and effect.

Claims

1. An analog magnetic field automatic adjustment control device is characterized in that comprising a magnetic field simulator, a geomagnetic sensor, an analog-to-digital converter, a central processing unit and a digital-to-analog converter;

The magnetic field simulator includes three coils, each of which is controlled by a current output from a current generator, and generates magnetic fields in directions X, Y and Z in the magnetic field simulator;

The geomagnetic sensor senses the simulated Gauss value of the magnetic field strength in the X, Y and Z directions in the central position of the magnetic field simulator;

The analog-to-digital converter is used to convert the above-mentioned analog Gauss value into a digital signal output that can be interpreted by the central processing unit;

The central processing unit has at least one interpretation program, the interpretation program presets the digital Gaussian values of the magnetic field strength in the X, Y and Z directions in the above-mentioned magnetic field simulator, and makes the digital signal output by the analog-to-digital converter consistent with the preset The digital Gauss value is compared, and a current control signal is output;

The digital-to-analog converter receives the current control signal output by the central processing unit and converts it into an analog signal acceptable to the current generator to change the current output by the current generator and change the X, Y in the magnetic field simulator And the magnetic field in the Z direction.

2. The analog magnetic field automatic adjustment control device as claimed in claim 1, characterized in that:

The geomagnetic sensor and the analog-to-digital converter are composed of a global positioning system (Global Position System) with an analog-to-digital converter.

3. The analog magnetic field automatic adjustment control device as claimed in claim 1 or 2, characterized in that:

When the digital signal output by the analog-to-digital converter is greater than the preset digital Gauss value in the central processing unit, the central processing unit will output a control signal to reduce the amount of current to the current generator, so that the current generator outputs The amount of current is reduced to weaken the magnetic field in the X, Y and Z directions in the magnetic field simulator.

4. The analog magnetic field automatic adjustment control device as claimed in claim 1 or 2, characterized in that:

The analog magnetic field automatic adjustment control device also includes a keyboard connected to the central processing unit for inputting a preset digital Gauss value.

5. The analog magnetic field automatic adjustment control device as claimed in claim 1 or 2, characterized in that:

The analog magnetic field automatic adjustment control device also includes a display connected to the central processing unit, and the display displays the Gauss value read by the central processing unit from the geomagnetic sensor.