KR100640171B1 - Apparatus for generating a magnetic field and the method therefor - Google Patents

Abstract

The present invention relates to a method of generating a plurality of magnetic fields in order to test the effect of the magnetic field on the human body, comprising: dividing one period of the sine wave into a plurality of points and storing size data of the sine wave corresponding to each point for each address; And calling a first address corresponding to a predetermined reference signal and calling an n-th address having a predetermined phase difference from the reference signal according to a preset phase control signal, respectively, and a first corresponding to the reference signal. Generating a plurality of sinusoids by reading data stored in an address and an nth address having a predetermined phase difference from the reference signal, and converting the data into an analog signal corresponding to each of the sinusoids; After performing the step of generating a plurality of magnetic field by applying to the magnetic field coil, By improving the power supply method, the power source having different phases can be applied to the horizontal and vertical coils to arbitrarily adjust the phase of the magnetic field generated in the space, enabling various magnetic environment settings, and using a 60Hz sine wave using a microprocessor. By generating internally without relying on external power, it reduces the influence of output voltage due to the fluctuation of the externally supplied power, and accordingly, it is possible to continuously supply more stabilized power, thereby increasing the reliability of the magnetic field test. A magnetic field generating device for phase control and a method thereof are provided.

Description

Magnetic field generator for phase control and its method {APPARATUS FOR GENERATING A MAGNETIC FIELD AND THE METHOD THEREFOR}             

1 is a circuit diagram showing a magnetic field generating device according to the prior art,

2 is a circuit block diagram showing a magnetic field generating device for phase control according to the present invention;

3 is a circuit block diagram showing a detailed configuration of a microprocessor according to an embodiment of the present invention;

4 is a circuit diagram illustrating a detailed circuit of the preamplifier of FIG. 2 according to an embodiment of the present invention;

5 is a circuit diagram illustrating a detailed circuit of the power amplifier of FIG. 2 according to an embodiment of the present invention;

6 is a flowchart illustrating a method for controlling magnetic field generation phase according to the present invention.

      Explanation of symbols on the main parts of the drawings

100: waveform generation control unit 110: oscillation means

120: phase adjusting means 130: memory

140: microprocessor 141: counter

145: Adder 150: D / A Converter

160: post-processing unit 161,165: amplifier

200: power amplifier 210: insulated transformer

230: preamplifier 231-1,231-3: differential amplifier

250: power amplifier 251-1 to 251-4: amplifier

270: boost transformer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field generating power supply device, and more particularly, to a magnetic field generating device for phase control and a method thereof for testing and analyzing the effect of a magnetic field generated in an electromagnetic environment on a commercial frequency band on a living body.

In modern society, electricity is an essential energy source and the demand for electricity is increasing rapidly along with the development of industry. In electric power facilities and transmission and distribution lines, electromagnetic fields are inevitably generated, and studies on the effects of these fields on the human body are urgently required.

In order to evaluate the safety of the living body according to the magnetic field exposure, a magnetic field exposure apparatus for generating a uniform magnetic field in the space is required.

Conventionally, as shown in FIG. 1, the same current source is applied to the coils 1 orthogonally arranged to generate magnetic fields in the horizontal and vertical directions. The conventional power supply apparatus cannot fundamentally control the phase of the magnetic field generated by applying voltages of the same phase to the horizontal coil 2 and the vertical coil 3, respectively, and thus it is fundamentally impossible to set various magnetic environment.

In addition, the conventional method of controlling the voltage through the slide dax (5) also changes in conjunction with the voltage supplied to the magnetic field exposure device by the irregular variation of the input voltage, so that a uniform magnetic field can not be maintained for a long time to affect the living body There was a limit to the precise diagnosis of the effects of the disease.

Accordingly, an object of the present invention is to provide a phase control magnetic field generating device for generating a plurality of AC signals having different phases by receiving power from a single phase in order to control the phase of the magnetic field, and a method thereof.

Another object of the present invention to generate a plurality of alternating signals by internally generating a sinusoidal wave of 60Hz without depending on the external power source, thereby reducing the influence of the output voltage due to the fluctuation of the power supplied from the outside more stable power It is to provide a magnetic field generating device for phase control and a method for continuously supplying the same.

According to an aspect of the present invention, there is provided an apparatus for testing an effect of a magnetic field on a living body, the apparatus comprising: a waveform generation controller for generating sinusoids of different sizes having a predetermined phase difference; And a power amplifier configured to amplify and output sine waves of different phases generated by the waveform generation controller, respectively.

The waveform generation control section includes oscillation means for generating a clock signal for dividing a sine wave of one period into n points; Phase adjusting means for outputting a phase control signal for a sine wave of one cycle; Call the corresponding address stored in the internal memory according to the clock signal output from the oscillation means to output the first data for the sine wave size, and call the corresponding address stored in the memory according to the phase control signal of the phase adjusting means. Microprocessors respectively outputting second data for the size; A plurality of D / A converters respectively converting the first data and the second data called from the memory into analog signals; And a post-processing unit for amplifying the AC waveform output through the D / A converter and removing DC component noise included in the AC signal, wherein the microprocessor stores data indicating the magnitude of the sine wave for each address. Memory being played; A counter which receives the clock signal outputted from the oscillation means and counts and calls the first data of the sine wave size stored in the corresponding address from the memory; And an adder configured to add the output signal of the counter and the phase control signal output from the phase adjusting means to output second data corresponding to the magnitude of the sine wave stored in the corresponding address from the memory.

The power amplifier may include: an insulation transformer configured to variably adjust the magnitude of the waveform by receiving an AC signal output from the waveform generation controller; A plurality of pre-amplifiers which receive the output signal of the isolation transformer and differentially amplify them separately according to the polarity of the AC waveform, and then output the shifted levels; A plurality of power amplifiers each receiving an AC waveform output from the preamplifier and amplifying and outputting a current capacity separately according to polarity; And a boost transformer for amplifying the signals output from the power amplifier and outputting the signals to the magnetic field coil, wherein the preamplifier includes: a plurality of differential amplifiers that respond separately according to polarities of the AC waveforms output from the insulation transformer; And switch means for level shifting and outputting the differentially amplified signal through the differential amplifier, wherein the power amplifier includes a plurality of amplifiers connected in parallel with signals output from the plurality of preamplifiers in parallel according to polarities. After receiving the amplified input current is characterized in that configured to supply to the magnetic field coil.

The technical method of the present invention for achieving the above object, in a method for generating a plurality of magnetic fields to test the effect of the magnetic field on the human body: after dividing one period of the sine wave into a plurality of points corresponding to each point A first step of storing the sine wave size data for each address; A second step of calling a first address corresponding to a predetermined reference signal and calling an n-th address having a predetermined phase difference from the reference signal according to a preset phase control signal; A third step of reading a plurality of sine waves by reading data stored in a first address corresponding to the reference signal and an nth address having a predetermined phase difference from the reference signal, and converting the data into analog signals corresponding thereto; And a fourth step of generating a plurality of magnetic fields by amplifying the current and the voltage generated by the sine wave, respectively, and applying the same to a magnetic field coil.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a circuit block diagram showing a phase control magnetic field generating device according to the present invention, Figure 3 is a circuit block diagram showing a detailed configuration of a microprocessor according to an embodiment of the present invention.

That is, the present invention relates to an apparatus for testing the influence of the magnetic field on the living body, and is largely composed of the waveform generation control unit 100 and the power amplifier 200.

The waveform generation controller 100 is configured to generate sine waves of different sizes having a predetermined phase difference, and the power amplifier 200 amplifies the sine waves of different phases generated by the waveform generation controller 100, respectively. It is configured to output through the magnetic field coil.

As shown in FIG. 2, the waveform generation control unit 100 includes an oscillation means 110 for generating a clock of a predetermined frequency for dividing a sinusoidal wave of one cycle into n points, and phase control for a sinusoidal wave of one cycle. A phase adjusting means 120 for outputting a signal and a corresponding address stored in the memory 130 according to the clock signal output from the oscillating means 110 to output the first data for the sine wave size and the phase A microprocessor 140 for calling the corresponding address stored in the memory 130 according to the phase control signal of the adjusting unit 120 and outputting second data corresponding to the magnitude of the sine wave, and the first call from the memory 130. Amplifying the AC waveform output through the first and second D / A converter 150 and the D / A converter 150 for converting the first data and the second data into the analog signal, respectively, and included in the AC signal. Direct current And a first and second post-processing unit 160 for removing component noise. The post-processing unit 160 includes first and second amplifiers 161 and 165 for amplifying an AC waveform. Each of the two amplifiers 161 and 165 includes a filter C1 and C5 such as a capacitor for removing noise corresponding to a DC component among AC signals output from the amplifiers 161 and 165.

As shown in FIG. 3, the microprocessor 140 receives a memory 130 storing data indicating the magnitude of a sine wave for each address and a clock signal output from the oscillation means 110. A counter 141 for calling the first data of the sine wave size stored in the corresponding address from the memory 130, and an output signal of the counter 141 and a phase control signal output from the phase adjusting means 120. The memory 130 includes an adder 145 for outputting second data corresponding to the sine wave size contained in the corresponding address.

The memory 130 includes a first ROM 131 storing first data about a sine wave by address and a second ROM 135 storing second data about a sine wave by address. It is preferable to configure the microprocessor 140, but also may be built separately.

The internal memory 130 stores the sine wave size data obtained by dividing a sine wave of one cycle into a plurality of points for each address, and the sine wave size data is a sine wave to generate a plurality of sine waves having a maximum phase difference of 360 °. It is preferable to repeat the recording for 2 cycles.

In addition, the oscillating means 110 generates a clock of 60 x nHz for dividing 360 °, which is one period of a sinusoidal wave having a frequency of 60 Hz, into n points, and the counter 141 is operated by the oscillating means 110. Count the output clock signal, but automatically reset when the clock signal of one cycle is counted and repeat the operation.

In addition, the sinusoids of different phases generated through the plurality of channels Ch1 and Ch2 of the microprocessor 140 and the D / A converter 150 may be formed by the devices 160 to 270 having the same configuration. For the convenience of description, the description will be mainly based on one channel Ch1.

Meanwhile, as illustrated in FIG. 2, the power amplifier 200 may include an insulation transformer 210 capable of variably adjusting a waveform size by receiving an AC signal output from the waveform generation controller 100 and the insulation transformer. The first to fourth pre-amplifiers 230 to receive the output signal of 210 and differentially amplify according to the polarity of the AC waveform, and then output the shifted levels are outputted from the pre-amplifier 230. Each of the first and second power amplifiers 250 to receive and separately amplify the current capacity according to the polarity, and boosting transformer 270 to amplify and output the signal output from the power amplifier 250 to the magnetic field coil, respectively. It consists of

In addition, the first preamplifier 231 may separately respond to the first and second differential amplifiers 231-1 according to the polarity of the AC waveform output from the secondary coil of the isolation transformer 211 as illustrated in FIG. 4. And 231-3 and switch means 231-2 and 231-4 for level shifting and outputting signals differentially amplified by the respective differential amplifiers 231-1 and 231-3.

The first power amplifier 251 includes first to fourth amplifiers connected in parallel with signals output from the first and second preamplifiers 231 and 232 according to polarity, as shown in the circuit diagram of FIG. 5. Amplified input current is provided through 251-1 to 251-4, and is then supplied to a magnetic field coil (not shown) such as a horizontal coil and a vertical coil of FIG. 1 through a boost transformer 271.

The first and second amplifiers 251-1 and 251-2 of the first power amplifier 251 are configured to amplify a current capacity in response to a positive AC power output from the first preamplifier 231. A plurality of NPN transistors Q21 to Q24 connected to each other and a plurality of PNP transistors Q25 to parallel connected to amplify a current capacity in response to a negative AC power output from the first preamplifier 231. Q28).

That is, the power amplifier 251 in parallel to the same NPN transistors Q21 to Q24 in common response to the signal output from the first pre-amplifier 231 to supply sufficient power to the load as shown in FIG. The second amplifier 251-which connects the connected first amplifier 251-1 and the PNP type transistors Q25 to Q28 in common to the signal output from the first preamplifier 231 in parallel. 2), a third amplifier 251-3 which connects in parallel the same NPN transistors Q31 to Q34 which respond in common to a signal output from the second preamplifier 232, and a second preamplifier Each of the fourth amplifiers 251-4 which connects the PNP-type transistors Q35 to Q38 in common to the signal output from 232 in parallel is configured.

The phase control magnetic field generating device of the present invention configured as described above is implemented through a predetermined design process in order to test the effect of the magnetic field on the human body, as shown in FIG. 6, a process of dividing one cycle of the sine wave into a plurality of points (S1). And storing the sine wave size data corresponding to each of the divided points for each address (S2), generating a predetermined reference signal and calling a first address corresponding to the reference signal (S3); Generating a set phase control signal to call an n-th address having a predetermined phase difference from the reference signal according to the reference signal and the phase control signal (S4), and reading data stored in the first address corresponding to the reference signal; Generating a first sinusoidal wave by converting it into an analog signal corresponding thereto (S5); and referring to the reference signal and the phase control signal, Reading data stored in an n-th address having a phase difference and converting the data into an analog signal corresponding thereto to generate a second sinusoid (S6); and amplifying the generated sinusoids by a current and a voltage, respectively, into a magnetic field coil. It consists of a process (S7) for generating a plurality of magnetic fields by applying.

In the process of storing data about the size of the sine wave in the memory 130 for each address, the number of addresses is allocated by multiplying the number obtained by dividing one period of the sine wave into a plurality of points by 2, Since the second sinusoidal wave is generated with a certain phase difference, the address is allocated by repeating the magnitude data for one period of the sinusoidal wave in two cycles. Therefore, the first and second sinusoidal waves can be designed to have a phase difference within 0 degrees to 360 degrees.

The overall operation and operation of the phase control magnetic field generating device configured as described above will be described in more detail based on the embodiments.

The waveform generation control unit 100 is for generating a sine wave having a frequency of 60 Hz, oscillation means 110, phase adjusting means 120, microprocessor 140, D / A converter 150 and post-processing unit 160 ) And the power amplifier 200 amplifies the generated sine wave and includes an insulation transformer 210, a preamplifier 230, a power amplifier 250, and a boost transformer 270.

3 is a circuit block diagram for generating the waveform generation controller 100, that is, two sinusoidal waves capable of phase control, and as shown in FIG. 3, one cycle of a sinusoidal wave having a frequency of 60 Hz, i. In order to represent the point, the oscillation means 110 requires a clock of 60 × n Hz. For example, in the present invention, the oscillation means 110 generating a clock of 86.4 kHz is composed of a crystal oscillator and a frequency divider IC to 1440 points. One cycle of sinusoids was divided.

The memory 130 composed of the first ROM 131 and the second ROM 135 allocates 2880 addresses to each of the ROMs 131 and 135, respectively, and corresponds to each point when the sine wave in one cycle is divided into 1440. The data indicating the magnitude of the sine wave is repeatedly stored for 2 cycles.

When the counter 141 is driven by the oscillating means 110, it calls the corresponding address of the first ROM 131 to transmit the stored data to the first D / A converter 151, and the first D / A converter. 151 converts digital data into an analog signal to generate a first sinusoidal wave having a period corresponding thereto. At the same time, the phase control signal of the phase adjusting means 120 corresponding to the phase difference is added to the output signal of the counter 141 through the adder 145, and the data of the address corresponding to the sum is called to the second ROM 135. The second D / A converter 155 transmits the second D / A converter 155 and converts the digital data into an analog signal to generate a second sinusoidal wave having a period corresponding thereto.

The phase control signal corresponding to the phase difference is added to the output signal of the counter 141 through the adder 145 to call the data of the address of the second ROM 135 corresponding to the second D / A converter 155. By transmitting the sine wave, the sine wave having a phase difference relative to the sine wave generated in the first D / A converter 151 is output. For example, when the output of the counter 141 is 0 and the output of the phase control signal is n, the first D / A converter 151 calls data stored at address 0, and simultaneously the second D / A converter 155. Outputs the data stored at n to the output, resulting in two sine waves having a phase difference of n × (360/1440) °.

In the present invention, the phase can be adjusted in 0.25 ° units by dividing one cycle of 360 ° into 1440 equal parts. The counter 141 transmits a signal up to 1440 and then automatically resets to repeat the process. The phase adjustment enables phase adjustment from 0 ° to 360 ° by controlling the added signal from 0 to 1440. In this case, the first ROM 131 and the second ROM 135 need at least 2880 addresses to represent the sum (maximum; 1440 + 1440) of the count signal and the phase control signal.

In FIG. 2, since the sine wave output through the D / A converter 151 is a weak signal of about 1V, the sine wave is amplified by the amplifier 161 which is the post-processing unit 160 and included in the AC signal through the capacitor C1. Remove the noise of the current component.

In addition, the AC signal passing through the capacitor (C1) of the post-processing unit 160 is input to the insulation transformer 211 of the power amplifier 200 to vary the size of the signal by the variable resistor 212 connected to the input terminal. Through this, it is possible to adjust the voltage of the output secondary secondary coil. The insulation transformer 211 has a pair of independent output terminals 213 and 214, and sinusoidal waves in which phases are reversed from each other are output and input to the first and second preamplifiers 231 and 232, respectively.

Each preamplifier 231 includes bidirectional differential amplifiers 231-1 and 231-3 as shown in FIG. 4.

The positive signal output from the isolation transformer 231 is differentially inputted to the first transistor Q1 and the second transistor Q2 composed of FET elements to improve linearity and maintain a low input capacitor, respectively. And cascode method using sixth transistors Q5 and Q6. The ninth transistor Q9 forms a level shift circuit, and a signal amplified by the emitter grounded tenth transistor Q10 is input to the power amplifier 251 through an output terminal.

On the other hand, the negative signal is differentially input to the third and fourth transistors Q3 and Q4, level-shifted by the eleventh transistor Q11, and then amplified by the twelfth transistor Q12 to be a power amplifier 251. Is entered.

The driving signals inputted through the first and second preamplifiers 231 and 232 are respectively increased in current capacity through the amplifiers 251-1 to 251-4 of the power amplifier 251, thereby boosting the transformer for the output stage. It is boosted through 271 and applied to the final magnetic field coil. In this case, since the input voltages of the first and second preamplifiers 231 and 232 have a 180 ° phase difference, the output voltage of the first power amplifier 251 also has a 180 ° phase difference. Since a voltage twice as large as the amplified voltage is applied to the boost transformer 271, sufficient power can be obtained at a low boost ratio.

Since the DC bias power used in the present invention is converted into a predetermined DC voltage through the AC 220V to the predetermined DC voltage through the constant voltage circuit unit 320 is supplied to the overall circuit unit while maintaining a constant constant voltage, The voltage supplied to each circuit unit can be kept constant regardless of the voltage variation.

Although specific embodiments of the present invention have been described and illustrated above, the present invention may be carried out by those skilled in the art, for example, by changing the number of splitting points for a sine wave in one cycle in consideration of the number of clocks, the phase adjusting frequency, and the necessary phase difference of the oscillation means. It is obvious that various modifications can be made. Such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

Therefore, the present invention improves the existing single-phase power supply method as a power supply device for supplying current to the magnetic field coil in order to evaluate the influence of the living by the magnetic field generated in the power equipment and transmission line power source having a different phase By applying to the horizontal and vertical coil, the phase of the magnetic field generated in the space can be arbitrarily adjusted, there is an advantage that it is possible to set a variety of magnetic field environment.

In addition, by generating a 60 Hz sine wave using a microprocessor internally without depending on the external power source, the influence of the output voltage due to the fluctuation of the externally supplied power can be reduced, thereby providing a more stable power supply. This has the advantage of increasing the reliability of the magnetic field impact test.

Claims (14)

In a device for testing the effect of a magnetic field on a living body: A waveform generation controller for generating sinusoids of different sizes having a predetermined phase difference; And And a power amplifier configured to amplify and output sine waves of different phases generated by the waveform generation controller. The waveform generation control unit, Oscillating means for generating a clock signal for dividing a sine wave of one period into n points; Phase adjusting means for outputting a phase control signal for a sine wave of one cycle; Call the corresponding address stored in the internal memory according to the clock signal output from the oscillation means to output the first data for the sine wave size, and call the corresponding address stored in the memory according to the phase control signal of the phase adjusting means. Microprocessors respectively outputting second data for the size; A plurality of D / A converters respectively converting the first data and the second data called from the memory into analog signals; And And a post-processing unit for amplifying an AC waveform output through the D / A converter and removing DC component noise included in an AC signal. delete The method according to claim 1, The microprocessor, A memory for storing data indicating the magnitude of the sine wave for each address; A counter which receives the clock signal outputted from the oscillation means and counts and calls the first data of the sine wave size stored in the corresponding address from the memory; And And an adder configured to add the output signal of the counter and the phase control signal output from the phase adjusting means to output second data corresponding to the magnitude of the sine wave stored in the corresponding address from the memory. The method according to claim 3, The counter counts a clock signal output from the oscillation means, and when the clock signal of one cycle is all counted, the phase control magnetic field generating device for repetitive operation, characterized in that the automatic operation. The method according to claim 1, And said oscillating means generates a clock of 60 x nHz for dividing 360 degrees which is one period of a sine wave having a frequency of 60 Hz into n points. The method according to claim 1, And the memory stores the sine wave size data obtained by dividing a sine wave of one cycle into a plurality of points for each address, wherein the sine wave size data is repeatedly recorded for two periods of the sine wave. The method according to claim 1, The memory includes: a first ROM storing first data about a sine wave size; And a second ROM storing second data on the size of the sine wave. The method according to claim 1, The power amplifier may include: an isolation transformer configured to variably adjust the magnitude of the waveform by receiving an AC signal output from the waveform generation controller; A plurality of pre-amplifiers which receive the output signal of the isolation transformer and differentially amplify them separately according to the polarity of the AC waveform, and then output the shifted levels; A plurality of power amplifiers each receiving an AC waveform output from the preamplifier and amplifying and outputting a current capacity separately according to polarity; And a boost transformer for amplifying the signals output from the power amplifier and outputting the signals to the magnetic field coils. The method according to claim 8, The preamplifier includes: a plurality of differential amplifiers which respond separately according to polarities of the AC waveforms output from the isolation transformer; And switch means for level shifting and outputting the differentially amplified signal through the differential amplifier. The method according to claim 8, The power amplifier is configured to receive a signal output from the plurality of pre-amplifiers through a plurality of amplifiers connected in parallel to each other in parallel to amplify the input current and to supply the magnetic field coil for phase control. . The method according to claim 10, The amplifying unit includes a plurality of NPN transistors for amplifying a current capacity in response to a positive power supply output from a preamplifier; And a plurality of PNP type transistors which amplify the current capacity in response to a negative power supply output from the preamplifier in common. The method according to claim 11, And the plurality of NPN transistors or the plurality of PNP transistors are connected in parallel with adjacent transistors, respectively. In a method of generating a plurality of magnetic fields to test the effect of the magnetic field on the human body: Dividing one period of the sine wave into a plurality of points and allocating the sine wave size data corresponding to each point for each address and storing the sine wave in the memory; Calling a first address corresponding to a predetermined reference signal and calling an n-th address having a predetermined phase difference from the reference signal according to a preset phase control signal; Generating a plurality of sinusoids by reading data stored in a first address corresponding to the reference signal and an n-th address having a predetermined phase difference from the reference signal, and converting the data into an analog signal corresponding thereto; And And generating a plurality of magnetic fields by amplifying the generated sinusoidal wave and amplifying the current and the voltage, respectively, into a magnetic field coil. The method according to claim 13, In the step of allocating the size data of the sine wave to each address, generating the sine wave having a maximum phase difference of 360 °, the magnitude data of the sine wave is repeatedly recorded for two periods of the sine wave. Way.

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