KR20230173882A - Filter apparatus and steering control system including the same - Google Patents

Abstract

A filter device according to an embodiment of the present invention includes: a first coil having both ends electrically connected to one end of a signal source and one end of a load, respectively; and a second coil arranged to be coupled to the first coil by electromagnetic induction, wherein the other end of the signal source is electrically connected to the other end of the load unit, and the second coil is connected to the signal source and the load unit. It is not electrically connected, but is electrically connected to a sensor unit that senses the state of the signal source or the load unit.

Description

Filter device and steering control system including the same {FILTER APPARATUS AND STEERING CONTROL SYSTEM INCLUDING THE SAME}

The present invention relates to a filter device and a steering control system including the same, and more specifically, to a filter device that can detect the state of a signal source or load while filtering differential mode noise, and a steering control system including the same.

In general, a steering system may refer to a system that can change the steering angle of a wheel based on the steering force (or rotational force) applied to the steering wheel by the driver of the vehicle. Recently, an electric power steering (EPS) system that uses an electric motor and is more stable and has relatively higher fuel efficiency has been used. For example, a control signal may be generated, filtered electrical energy may be converted according to the steering motor control signal to generate assist steering force, and the steering motor may be controlled based on the assist steering force.

In order to improve the performance of the steering system, research is being conducted on ways to reduce electrical noise contained in electrical signals flowing through power lines. Additionally, the steering system requires research on how to measure the current signal flowing through the power line.

Additionally, in order to ensure the stability of the EPS system, there are requirements for measuring current in the power line and determining the status of the EPS system.

One embodiment of the present invention seeks to provide a filter device that can determine the state of a signal source or load while filtering differential mode noise, and a steering control system including the same.

A filter device according to an embodiment of the present invention includes: a first coil including both ends electrically connected to one end of a signal source and one end of a load, respectively; and a second coil arranged to be coupled to the first coil by electromagnetic induction, wherein the other end of the signal source is electrically connected to the other end of the load unit, and the second coil is connected to the signal source and the load unit. It is not electrically connected, but is electrically connected to a sensor unit that senses the state of the signal source or the load unit.

In some embodiments, a filter device may be applied from the signal source to filter noise of the first current flowing through the first coil and the load unit.

In some embodiments, when the first current from the signal source flows through the first coil, a second current is induced in the second coil, and the sensor unit detects the signal source or the The status of the load can be determined.

A filter device according to an embodiment of the present invention includes: a first terminal and a second terminal respectively connected to both ends of a signal source; a third terminal and a fourth terminal respectively connected to both ends of the load unit; a first coil including both ends electrically connected to the first terminal and the third terminal, respectively; a second coil arranged to be coupled to the first coil by electromagnetic induction; and a sensor unit electrically connected to the second coil and sensing the state of the signal source or the load, wherein the second terminal and the fourth terminal are electrically connected to each other, and the second coil is connected to the first coil. It is not electrically connected to the first terminal, the second terminal, the third terminal, and the fourth terminal.

In some embodiments, the filter device includes a first signal applied from the signal source and flowing through the first terminal, the first coil, the third terminal, the load, the fourth terminal, and the second terminal. Current noise can be filtered.

In some embodiments, when the first current from the signal source flows through the first coil, a second current is induced in the second coil, and the sensor unit detects the signal source or the The status of the load can be determined.

In some embodiments, the filter device includes: a first sheet including the second terminal and the fourth terminal; a second sheet disposed on the first sheet and including a pattern of the sensor unit; and a third sheet disposed on the second sheet and including the first terminal and the third terminal.

In some embodiments, the filter device further includes a core around which the first coil and the second coil are wound, and the first coil and the second coil may be wound around the core in the same direction.

A steering control system according to an embodiment of the present invention includes: a signal source; a filter member that filters noise of electrical energy from the signal source; and a steering motor driver that receives the filtered electrical energy and controls a steering motor, wherein the filter member includes: a first coil having both ends electrically connected to one end of the signal source and one end of the steering motor driver, respectively; and a second coil arranged to be coupled to the first coil by electromagnetic induction, wherein the other end of the signal source is electrically connected to the other end of the steering motor drive unit, and the second coil is connected to the signal source and the steering. It is not electrically connected to the motor drive unit, but is electrically connected to the signal source or a sensor unit that senses the state of the steering motor drive unit, and the filter member is applied from the signal source to the first coil and the steering motor. Noise of the first current flowing through the driver is filtered.

In some embodiments, when a first current from the signal source flows through the first coil, a second current is induced in the second coil, and the sensor unit determines the state of the signal source based on the second current. Alternatively, the status of the steering motor driving unit may be determined.

A filter device according to an embodiment of the present invention and a steering control system including the same can determine the state of a signal source or load while filtering differential mode noise.

1 is a diagram schematically showing a conventional common mode filter.
Figure 2 is a circuit diagram schematically showing a steering control system according to an embodiment of the present invention.
Figure 3 is a diagram schematically showing a filter device according to an embodiment of the present invention.
Figure 4 is a diagram for explaining a filter unit according to an embodiment of the present invention.
Figure 5 is a diagram schematically showing a filter device according to an embodiment of the present invention.
Figure 6 is an exploded perspective view schematically showing a filter device according to an embodiment of the present invention.
7A, 7B, and 7C are diagrams schematically showing a first sheet, a second sheet, and a third sheet, respectively, of a filter device according to an embodiment of the present invention.
Figure 8 is a circuit diagram schematically showing a steering control system according to an embodiment of the present invention.
Figure 9 is a graph showing the voltage waveform of each component of the filter device according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Please note that the drawings are schematic and not drawn to scale. The relative dimensions and proportions of parts in the drawings are shown exaggerated or reduced in size for clarity and convenience in the drawings, and any dimensions are illustrative only and are not limiting. And for identical structures, elements, or parts that appear in two or more drawings, the same reference numerals are used to indicate similar features.

In this specification, terms such as first, second, and third may be used to describe various components, but these components are not limited by the terms. The above terms are used for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, a first component may be named a second or third component, etc., and similarly, the second or third component may also be named alternately.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings that can be commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless clearly specifically defined.

The embodiments of the present invention specifically represent ideal embodiments of the present invention. As a result, various variations of the diagram are expected. Accordingly, the embodiment is not limited to the specific shape of the illustrated area and also includes changes in shape due to manufacturing, for example.

Figure 1 is a diagram schematically showing a conventional common mode filter.

The conventional common mode filter shown in Figure 1 includes a first common mode coil (Ccom ₁ ) and a second common mode coil (Ccom ₂ ) respectively connected to both ends of a signal source (e.g., power supply) (not shown). can do. The first and second common mode coils Ccom ₁ and Ccom ₂ may be wound around one core, for example, in the same direction. For example, the first and second common mode coils Ccom ₁ and Ccom ₂ may be equivalently coupled inductors in which two inductor units L _com1 and L _com2 are coupled, for example, through electromagnetic induction. In one example, the common mode noise (I _com , I _com' ) is applied from a signal source (not shown) to each of the first and second common mode coils (Ccom ₁ , Ccom ₂ ) in the same direction, so As the magnetic flux becomes stronger, resistance increases. Therefore, common mode noise cannot pass through the common mode filter and can be filtered.

In at least one embodiment of the present invention, a filter device is provided that partially modifies the common mode filter as described above to enable filtering of noise, measurement of current in a power line, and identification of the state of the power supply or load.

A filter device according to an embodiment of the present invention can be applied to a steering control system. In one embodiment, the steering control system according to one embodiment may utilize an Electric Power Steer (EPS) system that uses an electric motor. A filter device according to an embodiment may filter noise in a signal of a signal source or voltage source applied to the steering control device.

However, the present invention is not limited to this, and the filter device according to an embodiment of the present invention can be used in various devices for filtering signal noise. For example, if the filter device of the present invention is located between an input power source and a power converter (e.g., an inverter, etc.), the electrical energy of the input power source (e.g., (alternating current and/or direct current) voltage and/or Current, etc.) can be filtered, as well as switching noise coming from a power converter (e.g., inverter, etc.).

Figure 2 is a circuit diagram schematically showing a steering control system according to an embodiment of the present invention. Figure 3 is a diagram schematically showing a filter device according to an embodiment of the present invention. Figure 4 is a diagram for explaining a filter unit according to an embodiment of the present invention.

2 and 3, the steering control system according to an embodiment of the present invention may include a signal source 1, a filter device 2, and a load unit 5.

In one embodiment, the signal source 1 may include a power source such as a battery. In one embodiment, the signal source 1 may include an input unit that can receive a signal input from a user and output a signal according to the input signal. In one embodiment, the signal source 1 may output a control signal for controlling the load unit 5.

In one embodiment, load 5 may comprise, for example, a steering control device. The steering control device according to one embodiment may include, for example, a steering motor driver that receives electrical energy to control the steering motor. For example, the load unit (5 in FIG. 2) converts the electrical energy (e.g., current, voltage, etc.) applied and filtered from the signal source (1 in FIG. 2) to generate assist steering force, and based on the assist steering force Thus, the steering motor (not shown) can be controlled. However, the embodiment of the present invention is not limited to this, and the load unit (5 in FIG. 2) may include various electronic devices that use the filtered signal.

Referring to FIGS. 2 and 3 , in one embodiment, the filter device 2 may include a filter unit 10 and a sensor unit 20.

In one embodiment, the filter unit 10 may be electrically connected between the signal source 1 and the load unit 5. In one embodiment, the filter unit 10 may include a first coil (L ₁ ) electrically connected to one end of the signal source (1). For example, one end of the first coil (L ₁ ) may be connected to one end of the signal source (1), and the other end of the first coil (L ₁ ) may be connected to one end of the load unit (5). In one embodiment, the other end of the signal source 1 may be electrically connected to the other end of the load unit 5. Although not shown in FIG. 2, the filter unit 10 according to one embodiment may further include a core around which the first coil (L ₁ ) is wound in addition to the first coil (L ₁ ), and may include parasitic capacitors, resistors, etc. It may also include more.

Referring to FIGS. 2 and 3 , in one embodiment, a signal applied from the signal source 1, for example, the first current (I ₁ ), passes through the first coil (L ₁ ) and the load unit 5. It can flow along a closed loop returning to the signal source (1). The direction of the first current (I ₁ ) is not limited to the direction of the arrow in FIG. 2 and may flow in the direction opposite to the arrow. For example, the other end of the load unit 50 may be connected to a reference power source (for example, a ground power source), and the other end of the signal unit 1 may also be connected to this reference power source so that the first current (I ₁ ) flows. A closed loop can be formed. For example, the first current (I ₁ ) may be a differential mode current (I _diff ) in which currents flowing in power lines at both ends of the signal source 1 have different directions. A noise source (N) may be located in the path of the closed loop through which the first current (I ₁ ) flows. However, the location of the noise source N in the embodiment of the present invention is not limited to that shown in FIG. 2.

In one embodiment, when the first current (I ₁ ), which is the differential mode current (I _diff ), is applied to the filter unit 10 , differential mode noise may be filtered by the first coil (L ₁ ). For example, a signal in a specific frequency range included in the first current (I ₁ ) may be passed or blocked. That is, the filter unit 10 can function as a differential mode filter. Here, the first current (I ₁ ) is described as a current for convenience of explanation, but is not limited to current and may mean electrical energy including an electrical signal, voltage, etc.

For example, referring to FIG. 4, the inductance value of the first coil (L ₁ ) of the filter unit 10 can be expressed as follows.

[Equation 1]

Here, L is the inductance value of the first coil (L ₁ ), R is the average radius of the core (e.g., Jaro), μ is the permeability of the core (e.g., Jaro), S is the cross-sectional area of the core, and N is The number of turns of the first coil (L ₁ ), ι, refers to the length of the core. Accordingly, the first coil (L ₁ ) of the filter unit 10 may filter the first current (I ₁ ) according to the inductance value (L).

In one embodiment, the sensor unit 20 may include a second coil (L ₂ ). In one embodiment, both ends of the second coil (L ₂ ) may be connected to the pickup sensor unit 21. In one embodiment, the second current (L ₂ ) flowing through the second coil (L ₂ ) may flow along a closed loop passing through the second coil (L ₂ ) and the pickup sensor unit 21. In one embodiment, the second coil L2 may not be electrically connected to the signal source 1 and the load 5.

In one embodiment, the pickup sensor unit 21 determines the status of the signal source ₁ and the load unit 5 (e.g., current/voltage value or It may include separate devices, power sources, resistors, inductors, capacitors, integrated circuit (IC) chips, circuit networks, etc. to determine on/off status). In one embodiment, although not shown, the sensor unit 20 includes a sensor control unit that drives the sensor unit 20, a display unit that informs the user of the status of the signal source 1 or the load unit 5, or Alarm unit, signal transmission unit that transmits the status of the signal source (1) or load unit (5) to the user or load unit (5), load unit ( 5) may further include a load control unit that transmits a control signal. For example, the sensor unit 20 can inform the user whether the load unit 5 is turned on or turned off, and when overcurrent flows in the signal source 1 or the load unit 5, the load unit ( A control signal to stop 5) can also be transmitted to the load unit (5). For example, the sensor control unit of the sensor unit 20 may transmit and receive signals with the steering motor driving unit of the load unit 5.

In one embodiment, the first and second coils L ₁ and L ₂ may be wound around one core (not shown), for example, in the same direction. However, the present invention is not limited to this, and the first and second coils L ₁ and L ₂ may be wound around one core in different directions. For example, the first and second coils L ₁ and L2 may each be equivalently inductor units, and the first and second coils L _{1 and} L2 may be a combined inductor in which two inductor units are combined. However, the embodiment of the present invention is not limited to this, and the first and second coils L ₁ and L ₂ may be any combination inductor connected by electromagnetic induction. For example, the first and second coils L ₁ and L ₂ may be coils surrounding a plurality of terminal sheets, or may be a plurality of sheet stacks including an inductor pattern.

As the first coil (L ₁ ) and the second coil (L ₂ ) are connected through electromagnetic induction, when the first current (I ₁ ) flows in the first coil (L ₁ ), the second coil (L ₂ ) A second current (I ₂ ) may be induced. For example, a second current (I ₂ ) induced according to a mutual inductance component value with the first coil (L ₁ ) may flow in the second coil (L ₂ ). Based on this second current (I ₂ ), the pickup sensor unit 21 detects the current/voltage of the signal source 1, the current/voltage of the first current (I ₁ ), and the current/voltage of the load unit 5. The voltage, the state of the signal source 1 or the load 5 (for example, whether the signal source 1 or the load 5 is in an on/off state), etc. can be measured. For example, the sensor unit 20 may convert a magnetic signal into an electric signal by using the second coil (L ₂ ) as a pickup coil using a magnetic pickup method. Therefore, according to an embodiment of the present invention, the current/voltage of the signal source 1, the first current (I ₁ ), and the load unit 5, the states of the signal source 1 and the load unit 5, etc. Based on this, the load unit 5 can be used more efficiently. For example, the sensor unit 20 determines the size of the signal applied by the signal source 1 based on the current/voltage applied by the signal source 1, and the steering motor included in the load unit 5 It is possible to perform various sensing tasks, such as determining whether the driving unit is on/off and detecting abnormal currents such as leakage current of the signal source (1) or load unit (5), and thereby perform efficient control.

That is, according to one embodiment of the present invention, not only can differential mode noise be filtered using an existing common mode filter, but also a separate separate device that requires a large area and high cost can be used to determine the status of the signal source and load. The sensor function can be performed using only resistors and capacitors without adding additional elements (e.g., shunts, Hall sensors, etc.), which has the advantage of being more stable and economical.

Figure 5 is a diagram schematically showing a filter device 2 according to an embodiment of the present invention. Figure 6 is an exploded perspective view schematically showing the filter device 2 according to an embodiment of the present invention. 7A, 7B, and 7C are diagrams schematically showing the first sheet 210, the second sheet 220, and the third sheet 230, respectively, of the filter device 2 according to an embodiment of the present invention.

In one embodiment, the filter device 2 may be, for example, a laminate in which a conductive pattern is formed on a plurality of insulating sheets. For example, referring to Figure 5, the filter device 2 includes a first terminal 231, a second terminal 232, a third terminal 233, a fourth terminal 234, and a first terminal 231. ) of the first coil (L 1 ) electrically connected between the first coil (L ₁ ) and the third terminal 233, the second coil (L ₂ ) connected to the first coil (L ₁ ) and electromagnetic induction, and the second coil (L ₂ ). It may include a pickup sensor unit 21 connected to both ends. In one embodiment, the second coil (L ₂ ) may not be electrically connected to the first terminal 231, the second terminal 232, the third terminal 233, and the fourth terminal 234. At this time, the second terminal 232 and the fourth terminal 234 are connected to each other and shorted, and may be connected to the first conductive pattern 215, for example.

6 to 7C, in one embodiment, the filter device 2 includes a first sheet 210, a second sheet 220 disposed on the first sheet 210, and a second sheet 220. It may include a third sheet 230 disposed on the top. The first to third sheets 210, 220, and 230 may be conventional insulating sheets known in the art.

Referring to FIG. 7A, in one embodiment, the first sheet 210 has a first terminal 211 and a second terminal 212 that are electrically connected to both ends of the signal source (1 in FIG. 2), respectively, and a load. It may include a third terminal 213 and a fourth terminal 214 that are electrically connected to both ends of the unit (5 in FIG. 2), respectively. In one embodiment, the first terminal 211 and the second terminal 212 are arranged to be spaced apart from each other on one side of the first sheet 210, and the third terminal 213 and the fourth terminal 214 are disposed on one side of the first sheet 210. 1 They may be arranged to be spaced apart from one another on one side of the sheet 210 and on the other side facing each other. The first terminal 211 may be in contact with the through hole (Th1), and the third terminal 213 may be in contact with the through hole (Th3). In one embodiment, the second terminal 212 and the fourth terminal 214 may be arranged to be spaced apart from the through holes Th2 and Th4. In one embodiment, the first conductive pattern 215 electrically connects the second terminal 212 and the fourth terminal 214 to each other. In one embodiment, the second terminal 212, the first conductive pattern 215, and the fourth terminal 214 may be formed as one body. The terminal 217 of the sensor unit (20 in FIG. 2) may be disposed in one area of the first sheet 210.

Referring to Figure 7b, the second sheet 220 is electrically connected to the first terminal 221, which is electrically connected to one end of the signal source (1 in Figure 2) and one end of the load unit (5 in Figure 2). It may include a third terminal 223. The first terminal 221 may contact the through hole Th5, and the third terminal 223 may contact the through hole Th7. The sensor pattern 227 of the sensor unit (20 in FIG. 2) may be disposed in one area of the second sheet 220. The second sheet 220 may include one or more second conductive patterns 225 so that the sensor pattern 227 is connected to the through holes Th6 and Th7, respectively. However, the embodiment of the present invention is not limited to this, and the second sheet 220 may be formed in plural numbers to stably and efficiently form the sensor pattern 227. That is, the second sheet 220 may include a sensor pattern 227 including conductive patterns that are differently formed across a plurality of sheets.

Referring to FIG. 7C, the third sheet 230 is electrically connected to the first terminal 231, which is electrically connected to one end of the signal source (1 in FIG. 2) and one end of the load unit (5 in FIG. 2). It may include a third terminal 233. The first terminal 231 may contact the through hole Th9, and the third terminal 233 may contact the through hole Th11. The terminal 237 of the sensor unit (20 in FIG. 2) may be disposed in one area of the third sheet 230. In one embodiment, the third sheet 230 is shown in FIG. 7C as including a second terminal 232 and a fourth terminal 234 spaced apart from the through holes Th10 and Th12, but the second The terminal 232 and the fourth terminal 234 may be omitted depending on the design.

In one embodiment, the first coil (L ₁ ) may be disposed on the third sheet 230 to be electrically connected to the first terminal 231 and the third terminal 233. For example, both ends of the first coil (L ₁ ) have through holes (Th9, Th11) of the third sheet 230, through holes (Th5, Th7) of the second sheet 220, and the first sheet ( 210) are connected to the first terminals (211, 221, 231) and the third terminals (213, 223, 233) of the first to third sheets (210, 220, 230) through the through holes (Th1, Th3), respectively. You can. In one embodiment, both ends of the second coil L ₂ may be disposed on the third sheet 230 so that both ends are electrically connected to the through holes Th10 and Th12, respectively. For example, both ends of the second coil (L ₂ ) have through holes (Th10, Th12) of the third sheet 230, through holes (Th6, Th8) of the second sheet 220, and a second conductive pattern ( It can be electrically connected to the sensor pattern 227 through 225).

In one embodiment, although not shown, the first terminals 211, 221, 231 and the second terminals 212, 232 are electrically connected to both ends of the signal source (1 in FIG. 2), respectively, and the third terminal ( The fourth terminals 213, 223, and 243) and the fourth terminals 214 and 234 may be electrically connected to both ends of the load unit (5 in FIG. 2), respectively. In one example, each of the first terminals 211, 221, 231, the second terminals 212, 232, the third terminals 213, 223, 233, and the fourth terminals 214, 234 are electrically connected. It can be.

The embodiment of the present invention is not limited to the above description, and if necessary, each sheet 210, 220, and 230 is formed in plural, and each component is within the range that does not impair the implementation of the embodiment of the present invention. may be formed on another sheet. The first to third sheets 210, 220, and 230 each include a plurality of sheets, and conductive patterns formed differently across the plurality of sheets may be formed to perform the function of each sheet. In one embodiment, the first to third sheets 210, 220, and 230 are arranged in reverse order, so that the second sheet 220 is placed on the third sheet 230, and the first sheet 210 is placed on the third sheet 230. 2 may be disposed on the sheet 220 , and the first coil (L ₁ ) and the second coil (L ₂ ) may be disposed on the first sheet 210 .

Figure 8 is a circuit diagram schematically showing a steering control system according to an embodiment of the present invention. Figure 9 is a graph showing the voltage waveform of each component of the filter device 2 according to an embodiment of the present invention.

The circuit diagram of FIG. 8 exemplarily shows a schematic circuit diagram of a steering control system according to an embodiment, and the steering control system of the present invention may further include a plurality of passive elements, active elements, etc., as needed.

The steering control system of Figure 8 includes, for example, a signal source 1; and a filter device 2 including a filter unit 10 and a sensor unit 20. Although not shown, the steering control system may further include a load unit (5 in FIG. 2). For example, the signal source 1 outputs a voltage V1, and the input voltage Vin is applied to the first coil L ₁ of the filter unit 10. Voltage (L ₂ _V) is applied to the second coil (L ₂ ) of the sensor unit 20. The sensor unit 20 may include a pickup sensor unit (21 in FIG. 2) including a second coil (L ₂ ) and an integrator at a rear end of the pickup sensor unit. Voltage (Vad) is output from the integrator. The transfer function of the output voltage (Vad) can be expressed as the product of the transfer function of the pickup sensor unit and the transfer function of the integrator.

Referring to FIG. 9, the input voltage (Vin) applied to the first coil (L ₁ ) from the signal source 1 is in the range of about -5 V to 5 V, and the voltage applied to the second coil (L ₂ ) (L2_V) is in the range of about -3.1 mV to 3.1 mV, and the voltage (Vad) output by the sensor unit 20 is in the range of about -31 mV to 31 mV. Referring to the waveform diagram of FIG. 9, as the input voltage (V _in ) is applied, the voltage (L2_V) applied to the second coil (L2) and the voltage (Vad) output by the sensor unit 20 are the input voltage (Vin). ), and it was confirmed that the voltage/current and on/off state of the input voltage (V _in ) could be sensed.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive, and the scope of the present invention is indicated by the claims described later in the detailed description, and the meaning and scope of the claims and All changes or modified forms derived from the equivalent concept should be construed as falling within the scope of the present invention.

1: signal source
2: Filter device
5: subordinate part
10: Filter part
20: sensor unit
21: Pickup sensor unit
210, 220, 230: 1st, 2nd, 3rd sheets
211, 221, 231: 1st terminal
212, 232: second terminal
213, 223, 233: Third terminal
214, 234: 4th terminal

Claims (10)

a first coil including both ends electrically connected to one end of the signal source and one end of the load unit, respectively; and
It includes a second coil arranged to be coupled to the first coil by electromagnetic induction,
The other end of the signal source is electrically connected to the other end of the load unit,
The second coil is not electrically connected to the signal source and the load, but is electrically connected to a sensor unit that senses the state of the signal source or the load.
According to paragraph 1,
A filter device for filtering noise of the first current applied from the signal source and flowing through the first coil and the load unit.
According to paragraph 1,
When a first current from the signal source flows through the first coil, a second current is induced in the second coil,
The sensor unit is a filter device that determines the state of the signal source or the load unit based on the second current.
A first terminal and a second terminal respectively connected to both ends of the signal source;
a third terminal and a fourth terminal respectively connected to both ends of the load unit;
a first coil including both ends electrically connected to the first terminal and the third terminal, respectively;
a second coil arranged to be coupled to the first coil by electromagnetic induction; and
It is electrically connected to the second coil and includes a sensor unit that senses the state of the signal source or the load unit,
The second terminal and the fourth terminal are electrically connected to each other,
The second coil is a filter device that is not electrically connected to the first terminal, the second terminal, the third terminal, and the fourth terminal.
According to paragraph 4,
A filter device for filtering noise of a first current applied from the signal source and flowing through the first terminal, the first coil, the third terminal, the load, the fourth terminal, and the second terminal.
According to paragraph 4,
When a first current from the signal source flows through the first coil, a second current is induced in the second coil,
The sensor unit is a filter device that determines the state of the signal source or the load unit based on the second current.
According to paragraph 4,
a first sheet including the second terminal and the fourth terminal;
a second sheet disposed on the first sheet and including a pattern of the sensor unit; and
A filter device disposed on the second sheet and further comprising a third sheet including the first terminal and the third terminal.
According to paragraph 4,
Further comprising a core around which the first coil and the second coil are wound,
A filter device wherein the first coil and the second coil are wound around the core in the same direction.
signalman;
a filter member that filters noise of electrical energy from the signal source; and
A steering motor driving unit that receives the filtered electrical energy and controls the steering motor,
The filter member is
a first coil having both ends electrically connected to one end of the signal source and one end of the steering motor drive unit, respectively; and
It includes a second coil arranged to be coupled to the first coil by electromagnetic induction,
The other end of the signal source is electrically connected to the other end of the steering motor drive unit,
The second coil is not electrically connected to the signal source and the steering motor drive unit, but is electrically connected to a sensor unit that senses the state of the signal source or the steering motor drive unit,
The filter member filters noise of the first current flowing through the signal source, the first coil, and the steering motor drive unit.
According to clause 9,
When a first current from the signal source flows through the first coil, a second current is induced in the second coil,
A steering control system in which the sensor unit determines the state of the signal source or the state of the steering motor driver based on the second current.