JPS5981509A - Magnetic goniometer - Google Patents

Abstract

PURPOSE:To display an accurate azimuth by comparing a voltage corresponding to the output of a magnetic azimuth sensor with a stepwise rising voltage from an operation processing circuit, and latching the output of the magnetic azimuth sensor when the large/small relation between those voltages is inverted and performing operational processing. CONSTITUTION:When the output of the magnetic azimuth sensor 1 is amplified and inputted to uninverted input terminals of comparators 13a and 13b respectively, the voltage which rises stepwise after the analog conversion of a D/A converter 15 is inputted to inverted input terminals from the operation processing circuit 11 respectively. Outputs of amplifiers 6a and 6b are compared with the stepwise rising voltage and when the stepwise rising voltage exceeds the output voltages of the amplifiers 6a and 6b, the output voltages of the amplifiers 6a and 6b are latched by latch circuits 14a and 14b. The latched voltages correspond to the magnetic azimuth output of the magnetic azimuth sensor 1. Therefore, the latched voltages are processed by the circuit 11 to display the current azimuth accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic orientation side that displays orientation.

The conventional magnetic direction H1 is configured as shown in FIG. In FIG. 1, 1 is a magnetic azimuth sensor consisting of two substantially orthogonal line widths 3a and 3b wound around a core 2 and an excitation line shaft 5 connected to an AC power source 4; 6a and 6b are 2 of the magnetic azimuth sensor 1; Two lines! , i3a and 3b, respectively; 7a and 7h are bandpass filters that pass signals of predetermined frequencies output from the amplifiers; 8a;
, 8b is a half-wave cut circuit that clips the half-wave of the sine wave that has passed through the band-pass filters 7a and 7b; 9a and 9b are integrators that integrate the outputs of the half-wave cutters 1 to 8a and 8b and convert them into direct current; 10a, 10b are A/D converters that convert the outputs of the integrators 9a, 9b into digital; 11 is an arithmetic processing circuit ( microcomputer), 12 is a display meter that displays the output of the arithmetic processing circuit 11, and the pulse signal corresponding to the direction from the magnetic direction sensor 1 is amplified by amplifiers 6a and 6b, and is converted to a constant frequency by bandpass filters 7a and 7b. Only the signal voltage of
Bandpass filters 7a, 7 with clip circuits 8a, 8b
A half-wave of the sine wave of the output signal of b is extracted and sent to the integrating circuit 9.
It is integrated at a and 9b and converted into a direct current. Since the level of this DC-converted signal corresponds to the direction, this signal is A
/D converters 1゜a, 10b convert the signals into digital signals, and then the arithmetic processing circuit 11 calculates the direction, and the display]2
is displayed.

However, in this magnetic direction meter, although the voltage level of the pulse signal from the magnetic direction sensor corresponds to the direction,
Because it does not read it directly and instead uses a bandpass filter or an integrating circuit, the disadvantage is that errors in the characteristics of the bandpass filter and the characteristics of the integrating circuit overlap, resulting in a large error in the end. was there.

In order to eliminate the drawbacks of the above-mentioned conventional example, the present invention compares the output of a magnetic orientation sensor with a voltage that increases stepwise, and when the voltage that increases stepwise becomes higher than the output of the magnetic orientation sensor, the magnetic It is characterized by detecting the direction by calculating the output of the direction sensor.The purpose is to directly read the voltage level of the pulse signal of the magnetic direction sensor and calculate it, so there is no circuit like in the conventional example, so there is no error. This provides a magnetic orientation sensor with very few magnetic orientations. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 shows a block diagram of a magnetic azimuth meter according to an embodiment of the present invention, in which 1 is a magnetic azimuth sensor, 2 is a core, and 3a
, 3b is a winding, 4 is an AC power supply, 5 is an excitation winding, 6a, 6
b is an amplifier, 11 is an arithmetic processing circuit (microcomputer), ] 2 is a display, 13a, ], 3 b is a comparator,
14a and 1.4b are latch circuits, and 15 is a D/A converter.

In the magnetic direction meter of this embodiment, when the outputs of the amplifiers 6a-16b which amplified the output of the magnetic direction sensor 1 are input to the non-inverting input terminals of the comparators 13a and 13b, respectively, the comparators 13a and 13b A stepwise increasing voltage that is converted into an analog signal by a D/A converter 15 is input from the arithmetic processing circuit 11 to the inverting input terminal. Note that the peak level of the output of the magnetic orientation sensor 1 changes depending on the orientation as shown in FIG. amplifier 6a when exceeds the output voltage of amplifiers 6a and 6b,
When the output voltage of 6b is latched by the latch circuits 14a and 14b, the latched voltage corresponds to the magnetic azimuth output of the magnetic azimuth sensor l. Therefore, latch circuit 14
When the voltages launched at a and 14b are processed by the arithmetic processing circuit 11, the azimuth at that time is accurately displayed.

FIG. 4 shows a circuit diagram of a D/A converter that outputs a step-by-step voltage according to an embodiment of the present invention. 16.17
．． 18 are connected to each other.

In addition, parallel resistors 19, 20, and 21 are connected between each of resistors 16, 17, and 18 and between the ground and a resistor of 1G.
, 19 are connected to the inverting input terminals of the comparators 13a and +3b.

- In this embodiment configured in this way, the amplifier 6a,
When the output from 6b is input to the non-inverting input terminals of the comparators 13a and 13b, the output terminals A and B of the arithmetic processing circuit
, C, the voltages shown in the table below are sequentially output. That is, when the output voltage of (0, Olo,) is output to the output terminals A, 3, and C, the minimum voltage Vo is generated at the terminal, and then the output voltage of (0, Olo,) is output to the output terminals A, B, and C. , 0, 1), the next voltage v1 is generated, and so on, the minimum voltage Vo to the maximum voltage 7 are repeatedly output in a fixed cycle or an irregular cycle, and the comparators 13a and 13b
is input. Here, the voltage at the terminals of the amplifiers 6a, 6
When the voltage becomes higher than the voltage at voltage b and the magnitude relationship between the two voltages is reversed, the voltage at that time is latched by the launch circuits 14a and 14b, and based on the output thereof, the arithmetic processing circuit 11 calculates the direction and displays it on the display 12. .

(Table) BC Vo 0 0 0 V, 001 v2 0 1 0 V2O11 V4 100 V51 0 1 V8 110 V71 1 ] In this embodiment, the arithmetic processing circuit 11 and the D/A converter 15
This voltage is compared with the outputs of the amplifiers 6a and 6b corresponding to the output of the magnetic direction sensor 1, and when the output voltage of the D/A converter 15 becomes high. Since the output voltages of the amplifiers 6a, 61) are latched and the outputs are processed and displayed, there is an advantage that the display is accurate.

In order to make the display more accurate, the number of output terminals of the arithmetic processing circuit 1 may be increased. For example, if the number of output terminals is four, the output voltage of the D/A converter will be in 16 levels, making it more accurate.

As explained above, according to the present invention, the voltage corresponding to the output of the magnetic azimuth sensor and the arithmetic processing circuit are gradually applied.
An accurate orientation can be displayed by comparing the voltage that increases by 1 and calculating and processing the output of the magnetic orientation sensor when the magnitude relationship of these voltages is reversed.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional magnetic azimuth meter, Fig. 2 is a circuit diagram of a magnetic azimuth meter according to an embodiment of the present invention, and Fig. 3 shows the relationship between the output of the magnetic azimuth sensor and the azimuth. Figure 4 is
FIG. 2 is a circuit diagram of a D/A converter of the present invention. ■... Magnetic direction sensor, 2... Core, 3a, 3b.
...Winding, 4...AC power supply, 5...Excitation winding, 6a
, 6b...N increaser, 13a, 13b...Comparator, 1
4a, 14b...Latch circuit, 15...D/A converter, 16-2I...Resistor. Patent applicant Nippon Seiki Co., Ltd.

Claims (1)

[Claims] Compare the output voltage from the two substantially orthogonal wire axes of the magnetic orientation sensor with the voltage that increases stepwise, and when the voltage becomes larger than the output voltage from the two wires,
Magnetic azimuth H1° whose special feature is to latch the outputs from the two wire wheels, perform arithmetic processing, and display the azimuth.