KR102596027B1 - Electromagnet array and power supply for driving the same - Google Patents

Abstract

The present invention relates to an electromagnet array and a power supply device for driving the same, comprising: an electromagnet array composed of a plurality of coils; and a first control unit that controls the current intensity and direction according to the user's input; and a second control unit that controls whether or not current is applied to each coil.

Description

Electromagnet array and power supply for driving the same {ELECTROMAGNET ARRAY AND POWER SUPPLY FOR DRIVING THE SAME}

Hereinafter, embodiments relate to an electromagnet array and a power supply device for driving the same.

A variety of experiments are being conducted in various fields using magnetic fields and the physical phenomena that occur accordingly. In particular, in the medical and life science fields, research is being conducted to provide direct magnetic field stimulation to the human body or cells using magnetic fields, or to move instruments containing magnetic materials that respond to magnetic fields or magnetic materials containing reagents or drugs for disease diagnosis and treatment to a desired location. It is progressing actively. For example, by arranging a coil composed of a plurality of solenoids around the area of interest, arbitrary movement of the magnetic body located at the center can be realized. The arrangement shape and size of the coil can be modified in various ways as needed.

Because electromagnets are controlled by the current applied to the coil, research on the power supply that applies current to the coil is also necessary. As an example, an experimental power supply capable of controlling the intensity and direction of current can be used. However, a single power supply typically has only one output or must be matched 1 to 1, making it inefficient. As another example, power can be supplied to the coil unit using a driver to drive the motor. However, since it is specialized for motor driving, it is not suitable for driving an electromagnet array that must respond in various ways to user input.
(Patent Document 1) KR 1020140109556 A

The purpose of the present invention relates to an electromagnet array and a power supply device for driving the same. More specifically, it is to provide an electromagnet array composed of a plurality of coils and a device that can efficiently supply and control power to the electromagnet array.

An electromagnet array and a power supply device for driving the same according to the present invention to achieve the above object include an electromagnet array composed of a plurality of coils; and a first control unit that controls the current intensity and direction according to the user's input; and a second control unit that controls whether or not current is applied to each coil.

The electromagnet array according to the present invention and the power supply device for driving it are capable of driving the rotation of a magnetic material in an area of interest and generating magnetic force in a specific direction, and are capable of controlling the intensity and direction of the current applied to each electromagnet, as well as having a single power supply unit. By using , current can be applied to multiple coils, thereby improving economic efficiency.

In addition, the power supply device for an electromagnet array can control the magnetic torque or magnetic force acting on a magnetic material placed in the region of interest by controlling the direction of the current applied to each coil.

Figure 1 is a schematic diagram of an electromagnet array and a power supply device for driving it.
Figure 2 is a schematic diagram of an H-Bridge circuit for controlling the intensity and direction of current.
Figure 3 is a schematic diagram of the operation of the electromagnet array.
Figure 4 is a schematic diagram of a power supply for an electromagnet array capable of controlling current intensity in an electronically controlled form.

Hereinafter, the present invention will be described in detail with reference to the attached drawings. The drawings introduced below are provided as examples so that the idea of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the spirit of the present invention.

Unless otherwise defined, the technical and scientific terms used in the specification of the present invention have the meanings commonly understood by those skilled in the art in the technical field to which this invention pertains, and the present invention is described in the following description and accompanying drawings. Descriptions of known functions and configurations that may unnecessarily obscure the gist of are omitted.

Additionally, as used herein in the specification, the singular forms “a,” “an,” and “the” are intended to also include the plural forms, unless the context clearly dictates otherwise.

Figure 1 shows an electromagnet array 100 in which a plurality of electromagnets are arranged facing each other around a region of interest, including a magnetic core 101 for focusing magnetic flux to the region of interest; and a coil winding unit 102 that can become an electromagnet when a current is applied; It is composed of and generates a magnetic field in the area of interest.

The first control unit 200, which is supplied with power from one main power source 201, is composed of two or more H-bridge circuits and can supply currents with at least two different current strengths and directions to the coil. A second control unit capable of selectively supplying power to each coil of at least two different current strengths and directions generated by the first control unit is connected to each coil or pair of coil units. The coil array 100, which consists of at least two pieces, receives current, forms a magnetic field, and implements a desired operation.

The first control unit 200 is configured based on an H-bridge circuit including four MOSFET elements, and controls the power applied to the main power supply 201 to a terminal connected to the coil unit according to a control signal input to the MOSFET element. The intensity and direction of the flowing current can be controlled. When a pulse width modulation (PWM) signal is input to the input terminals of the two MOSFET elements located on the left, only the power corresponding to the duty ratio of the pulse width modulation signal among the power supplied from the main power supply is output in the forward direction. When a pulse width modulation signal is input to the input terminals of the two MOSFET elements located on the right, only the power corresponding to the duty ratio of the pulse width modulation signal among the power supplied from the main power supply is output in the reverse direction.

The second control unit 300 controls whether or not current is applied to each coil using a switch connected to the coil winding unit 102 connected to each electromagnet. If you turn the switch ON to the coil to which you want to apply current and turn the other coils OFF, current is applied only to the coil to which the switch is turned ON.

Figure 2 is a schematic diagram of an H-Bridge circuit for controlling the intensity and direction of current. Generally, when configuring an H-bridge circuit, when signal 1 is input as HIGH, MOSFET 1 allows current to flow and MOSFET 2 prevents current from flowing. Conversely, when signal 1 is input as LOW, MOSFET 1 prevents current from flowing, and MOSFET 2 allows current to flow. MOSFET 3 (205) operates identically to MOSFET 1 (203) and MOSFET 4 (206) operates identically to MOSFET 2 (204). When a voltage is applied to the main power supply (VCC) and HIGH is input to signal 1 (201) by a pulse width modulation signal, current flows in MOSFET 1 (203) and no current flows in MOSFET 2 (204). Since signal 2 (202) is in a LOW state, no current flows through MOSFET 3 (205), but current may flow through MOSFET 4 (206). As a result, when a HIGH signal is input to signal 1 (201), forward current (207) flows. When a LOW signal is input to signal 1 (201), no current flows. In other words, when a pulse width modulation signal is input to signal 1, a current proportional to the duty ratio is applied in the forward direction. Similarly, when a pulse width modulation signal is input to signal 2, a reverse current 208 proportional to the duty ratio is applied. As a result, by using the H-bridge circuit, a current having a desired intensity and direction can be applied to the load 209.

Figure 3 is a schematic diagram of the operation of the electromagnet array. In order to rotate the magnetic material 104 located within the region of interest, it must be driven as shown in FIG. 3(a). In other words, when current is applied to two opposing coils in different directions, the magnetic materials are aligned in the direction of the magnetic field because of the attractive force between the different poles. In this state, when current is applied to the two coils in the direction to be rotated and the current is turned off to the originally applied coil, the magnetic body rotates at a certain angle in the direction to be rotated. If this operation is repeated, the magnetic material located within the area of interest can be rotated. In order to generate a driving force in a specific direction, the magnetic material can be driven as shown in FIG. 3(b). Even if current is applied to only one coil, magnetic force can be generated because a magnetic field is generated in the coil to which the current is applied. However, if current is applied to two neighboring coils to generate magnetic fields of different polarities, higher magnetic force can be generated, enabling efficient movement.

Figure 4 is a schematic diagram of a power supply for an electromagnet array capable of controlling current intensity in an electronically controlled form. The power supply device shown in Figure 1 consists of a second control unit 300 consisting of a mechanical switch. Since it is difficult to turn on/off the current applied to each coil, it can be replaced by using an electronic relay. Electronic switches using MOSFETs do not operate when the direction of current changes, so a coil-type relay must be used. In general, it is often difficult for the voltage or current generated by the controller to operate a coil-type relay, so you can also consider attaching a portacoupler that uses light in the middle.

As described above, the electromagnet array and the power supply device for driving the same according to the present invention propose an electromagnet array composed of several coils and a power supply device capable of applying power to each coil in a desired current intensity and direction. By allowing the magnetic material located in the area of interest to be driven as desired, it is expected to provide a technical basis that can be used for cell experiments and research, thereby sufficiently increasing its value as a base industry in the healthcare and electrical/electronic fields.

100: coil array
101: magnetic core
102: Coil winding part
200: 1st control unit
201: main power
300: second control unit

Claims (4)

In the power supply device for driving an electromagnet array in which a plurality of electromagnets are opposed to each other with an origin,
Magnetic core to focus magnetic flux to the area of interest;
A coil winding unit having a plurality of coils that become electromagnets when current is applied;
A first control unit composed of at least two H-bridge circuits supplied with power from one main power source and generating currents having at least two different current strengths and directions; and
A second control unit that controls to selectively supply currents having at least two different current intensities and directions generated by the first control unit to each of the plurality of coils.
Power supply to drive the electromagnet array. According to clause 1,
The plurality of coils,
Consisting of four or more coils arranged opposite each other with the center as the origin,
Power supply to drive the electromagnet array. According to clause 1,
The second control unit consists of an electronic relay,
Power supply to drive the electromagnet array. According to clause 3,
The electronic relay is composed of a photo coupler and a coil relay combined,
Power supply to drive the electromagnet array.