KR102506760B1 - Apparatus and Method for improving noise - Google Patents

Abstract

A noise amelioration device is disclosed. The noise amelioration device includes a head unit having an audio device, a central gateway receiving an audible frequency of the audio device when the audio device is operated, and a charging center frequency to one of a plurality of charging center frequencies to improve noise according to the audible frequency. It is characterized in that it includes a wireless charger that changes.

Description

Noise improvement apparatus and method {Apparatus and Method for improving noise}

The present invention relates to a wireless charging technology for a vehicle, and more particularly, to a noise amelioration apparatus and method for reducing noise for each channel by shifting a charging center frequency of a wireless charger according to an audio channel.

In general, when charging portable electronic devices (smartphone, tablet PC (Personal Computer), etc.) in a vehicle, a method of charging the electronic device by connecting it to a 12V DC output port using a wire such as a charging cable is applied. come. However, with the technological development of various portable electronic devices, a wireless charging method for electronic devices is applied, and a wireless charging unit is mounted in a vehicle as a kind of convenience device for drivers and passengers.

Such a wireless charging unit is mounted at a location adjacent to a cup holder, such as a lower portion of a center fascia panel between a driver's seat and a front passenger seat, or a front tray of a floor console. In addition, in the case of such a wireless charging unit, EMC (Electro Magnetic Compatibility) noise is generated. In other words, in the case of wireless charging, EMC (Electro Magnetic Compatibility) noise is always a problem because electronic devices are charged by radiating power to the outside.

To remove such EMC noise, printed circuit board (PCB) circuits and components are being redesigned. That is, EMC is shielded by evaluating after PCB redesign and component manufacturing, or by adding an exterior shield can (CAN).

However, in the case of the above method, there is a disadvantage in that the improvement can be confirmed only when the parts are first made and evaluated.

In addition, since the material cost increases when adding a shield can and the function can be executed only by radiating the charging frequency of the wireless charging unit, it may be impossible to apply the shield can in some cases.

1. Japanese Patent Publication No. 2014-0124003 2. Japanese Patent Publication No. 2014-0057069

The present invention has been proposed to solve the problems caused by the above background art, and an object of the present invention is to provide a noise improvement device and method capable of improving EMC (Electro Magnetic Compatibility) noise without making parts for evaluation.

Another object of the present invention is to provide a noise amelioration device and method capable of ameliorating EMC noise without radiating a charging frequency.

The present invention provides a noise amelioration device capable of ameliorating EMC noise in order to achieve the object presented above.

The noise amelioration device,

a head unit having an audio device;

a central gateway receiving an audible frequency of the audio device when the audio device is operated; and

It may be characterized by including; a wireless charger that changes to one of a plurality of charging center frequencies in order to improve noise according to the listening frequency.

In addition, the wireless charger may include a controller for determining one charging center frequency for avoiding the listening frequency and performing charging power control with the charging center frequency; and a coil switch selecting one of a plurality of coils radiating charging power according to the charging power control.

In addition, the determination of the charging center frequency may be characterized in that it is made according to the listening frequency in consideration of noise generation in the multiplication band of the charging center frequency.

In addition, the charging center frequency may be characterized in that it is selected within a charging frequency changeable range in consideration of hardware time constants for the plurality of coils.

In addition, the head unit may transmit guide information prior to execution of charging at the charging center frequency.

Also, the guide information may be at least one of text, graphics, and voice.

In addition, a forced noise reduction button for executing forced noise reduction according to a user input may be provided on the display of the head unit.

In addition, the forced noise reduction may be reset to off when the accessory is turned off.

In addition, in order to improve the noise, a spread spectrum clocking (SSC) method may be used to change the plurality of charging frequencies according to time.

On the other hand, another embodiment of the present invention includes an audio operation step in which the audio device of the head unit is operated; a reception step in which a central gateway receives an audible frequency from the audio device; and a changing step of changing, by the wireless charger, to one of a plurality of charging center frequencies to improve noise according to the listening frequency.

At this time, the changing step may include determining, by a controller, one charging center frequency for avoiding the listening frequency; performing, by the controller, charging power control with the charging center frequency as a result of the determination; and selecting, by a coil switch, one of a plurality of coils radiating charging power according to the charging power control.

The changing step may include transmitting, by the head unit, guide information prior to execution of charging at the charging center frequency.

According to the present invention, it is possible to reduce noise for each channel by shifting the charging center frequency of the wireless charger according to the audio channel in order to reduce noise at the multiplication frequency of 110 kHz, which is the central charging frequency of the wireless charger.

In addition, another effect of the present invention is that EMC (Electro Magnetic Compatibility) noise can be improved without manufacturing parts for evaluation.

In addition, as another effect of the present invention, it is possible to improve EMC noise without radiating a charging frequency, so that it can be applied to a real vehicle by minimizing noise caused by wireless charging when listening to a radio.

1 is a conceptual diagram of a noise amelioration apparatus according to an embodiment of the present invention.
FIG. 2 is a graph showing frequency transition performed by the noise amelioration apparatus shown in FIG. 1 .
FIG. 3 is a detailed configuration diagram of the wireless charger 130 shown in FIG. 1 .
4 is a flowchart showing a noise improvement process according to an embodiment of the present invention.
5 is a graph conceptually showing noise improvement according to an embodiment of the present invention.
6 is a graph conceptually showing noise improvement according to an embodiment of the present invention.
7 is a screen example showing evaluation results according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

In describing each figure, like reference numbers are used for like elements. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term "and/or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. Should not be.

Hereinafter, a noise amelioration apparatus and method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram of a noise amelioration apparatus 100 according to an embodiment of the present invention. Referring to FIG. 1 , the noise amelioration apparatus 100 includes a head unit 110 having an audio device (not shown), a central gateway 110 receiving an audible frequency from the audio device, and noise according to the audible frequency. It may be configured to include a wireless charger 130 or the like that changes to one of a plurality of charging center frequencies in order to improve.

The head unit 120 may include an audio device, a display, audio visual navigation (AVN), and the like. Of course, charging state information, alarm information, or vehicle information may be provided (displayed) to the driver through the head unit 120 .

The central gateway 110 may serve to deliver CAN communication messages between networks separated from each other. To elaborate, the central gateway 110 is communicatively connected to the head unit 120 through a multimedia-controller area network (MM-CAN).

That is, the central gateway 110 acquires listening frequency information through a multimedia-controller area network (MM-CAN) and transmits it to the wireless charger 130. The central gateway 110 and the wireless charger 130 are communicatively connected through a body-controller area network (B-CAN).

Of course, high-speed CAN (Controller Area Network), communication line (eg, 500kbps), CAN-FD (Flexible Data-Rate) communication line, Flexlay communication line, LIN (Local Interconnect Network) communication line, PLC (Power Line Communication) communication line, CP (Control Pilot) communication line, CP (Control Pilot), ZigBee, and Bluetooth. Therefore, when the audio device of the head unit 120 operates, the listening frequency is transmitted to the wireless charger 130 through the central gateway 110 .

The central gateway 110 may include a microcomputer, an integrated circuit, and a communication circuit to perform these communication functions.

The wireless charger 130 determines one charging center frequency for avoiding the listening frequency received from the head unit 120 and performs charging power control with the charging center frequency.

FIG. 2 is a graph showing a charging frequency transition performed in the noise amelioration apparatus shown in FIG. 1 . Referring to FIG. 2, the charging center frequency is changed according to the hearing frequency of audio (particularly, radio) in consideration of noise generation in the multiplication band of the charging center frequency.

For example, in consideration of the hardware (H/W) time constant of the coil, two optimal frequencies are selected within the charging frequency changeable range, and one of the two charging center frequencies is selected according to the listening frequency to implement the wireless charging function. . For example, transition 210 from 112 kHz to 115 kHz. or transition 210 from 115 kHz to 112 kHz. That is, the charge center frequency is determined (ie changed).

For understanding, if the listening frequency of the radio is 560 kHz, when charging wirelessly at 112 kHz, the frequency multiplied by 5 is the same as the listening frequency at 560 kHz, resulting in excessive noise. Therefore, the charging center frequency is changed so that it does not become the same frequency as the listening frequency.

Unlike this, when charging wirelessly at 115 kHz, noise is minimized by avoiding the corresponding radio channel with 4 times 460 kHz and 5 times 575 kHz.

In FIG. 2, two frequencies have been described as an example, but the present invention is not limited thereto, and it is possible to change to another frequency.

FIG. 3 is a detailed configuration diagram of the wireless charger 130 shown in FIG. 1 . Referring to FIG. 3, the wireless charger 130 determines one charging center frequency for avoiding the listening frequency and controls the charging power with the charging center frequency, the controllers 310-1 and 310-2, the A coil switch 370 that selects one of the first to nth coils 390-1 to 390-n and the first to nth coils 390-1 to 390-n for radiating charging power according to charging power control. ) and the like.

Of course, in addition to this, a transceiver 320 that is connected to the central gateway 110 through B-CAN to transmit and receive signals, a regulator 330 that adjusts battery power (B+), and a DC-DC that outputs a constant voltage with the regulator 330 A battery switch 340 that turns on and off between the converters 130, a full bridge circuit 360 that generates AC power by receiving a constant voltage and supplies it to the first to nth coils 390-1 to 390-n, and the like It consists of

The controllers 310-1 and 310-2 may be composed of one integrated controller. Of course, as shown in FIG. 3, it may be composed of a main controller 310-1 and a sub-controller 310-2. The main controller 310-1 transmits and receives a CAN signal to and from the transceiver 320. Also, by receiving a wake-up signal from the transceiver 320, the standby mode is changed to the active mode.

In addition, the main controller 320 serves to control the entirety of the wireless charger 130. In particular, it controls the transceiver 320, the regulator 330, the battery switch 340 and the sub controller 310-2. The main controller 320 controls accessory on (ACC) and smart key lock (SMK) from vehicle controllers such as an engine control unit (ECU), a hybrid control unit (HCU), and a vehicle control unit (VCU) through the central gateway 110. receive signals, etc. Of course, the state information (IND) of the wireless charger may be transmitted to the vehicle controller through the central gateway 110 .

The sub controller 320 performs a function of controlling charging performance. That is, after selecting the corresponding coils 390-1 to 390-n as the coil switch 370 according to the power control of the main controller 320, power is supplied to the corresponding coils through the full bridge circuit 360. Accordingly, wireless charging power is generated, and the wireless charging power is transmitted to the electric device 30 to be charged.

The electric device 30 includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a note pad, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation device, and an MP3 player. It may be a player, electric toothbrush, electronic tag, lighting device, remote control, fishing float, etc., but is not limited thereto, and any device equipped with a wireless power receiving means according to the present invention and capable of charging a battery is sufficient.

In addition, a Q factor circuit 381 for detecting a Q factor, an FSK communication circuit 383, a temperature sensor 385, and the like may be further configured.

Referring to FIG. 3, a frequency shift process for avoiding Electro Magnetic Compatibility (EMC) radiation noise is as follows.

① Listening frequency reception of AM band radio via B-CAN

② Setting the charging center frequency for avoiding the receiving frequency in the main controller 310-1

- X = f _listening % 112kHz, Y = f _listening % 115kHz (where f _listening is the listening frequency)

- Compare the X and Y values to determine (i.e. change) the charging center frequency as 112kHz if the X value is large and 115kHz if the Y value is large

③ The main controller 310-1 transmits the determined charging center frequency to the sub-controller 310-2.

④ The sub-controller 310-2 controls the charging power to the coils 390-1 to 390-n at the determined charging center frequency.

4 is a flowchart showing a noise improvement process according to an embodiment of the present invention. Referring to FIG. 4 , when the vehicle is started, the audio device of the head unit ( 120 in FIG. 1 ) is operated and wireless charging is operated at 112 kHz (steps S410 and S420 ).

In addition, the wireless charger 130 receives the listening frequency of the AM band radio through the B-CAN, and sets the charging center frequency for avoiding the receiving frequency (steps S430 and S440). In other words, the X and Y values are calculated and compared, and the charging center frequency is changed to 112 kHz when the X value is large, and the charging center frequency is determined to 115 kHz when the Y value is large (steps S441 and S450).

If the forcible noise reduction button is not turned on in step S460, the listening frequency is changed and steps S430 to S460 are performed again. A display of the head unit 120 may include a forced noise reduction button for executing forced noise reduction according to a user input. Of course, a forced noise reduction button may be provided on the side of the wireless charger. Of course, this forced noise reduction is reset to off when the accessory is turned off and is not performed.

In step S460, when the forced noise reduction button is turned on, the head unit 120 transmits guide information at the determined charging center frequency (112 kHz) before charging is executed (step S470). A message of guidance information may be "Some mobile phones may not be able to charge" or the like. The guide information may be a combination of text, graphic and/or audio.

The wireless charger 130 operates in a spread spectrum clocking (SSC) mode to control charging power to the coils 390-1 to 390-n at the determined charging center frequency (step S480).

Of course, forced noise reduction by user input has been described in FIG. 4, but it is not limited thereto, and an automatic noise reduction process may be executed.

5 is a graph conceptually showing noise improvement according to an embodiment of the present invention. Referring to FIG. 5, two examples 510 and 520 are shown. The graph of the thin solid line is the case of the conventional method, and the graph of the thick solid line represents the case where the present invention is applied. As shown in FIG. 5, it can be seen that the bandwidth of the thick solid line is widely distributed. The graph below is a waveform diagram showing that the charging center frequency oscillates with time on a wireless charger.

6 is a graph conceptually showing noise improvement according to an embodiment of the present invention. Referring to FIG. 6, it is a waveform diagram showing that the amplitude decreases according to the multiplication number. That is, as the multiple increases, the amplitude decreases.

7 is a screen example showing evaluation results according to an embodiment of the present invention. Referring to FIG. 7 , as a result of the RFI measurement, about 10 dB noise input reduction based on 562 KHz is shown. In addition, as a result of hearing evaluation, when listening to noise, high frequency is changed to low frequency white noise. That is, there is no change in noise inflow intensity. In addition, after applying SSM, the noise input component can be changed to be similar to radio white noise. Of course, it is necessary to adjust the SSM frequency and sweep time.

The noise improvement method according to the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination.

Program codes (commands) recorded on the medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, etc.

The medium may be a transmission medium such as a light or metal wire including a carrier wave for transmitting a signal designating a program command, a data structure, or the like, or a waveguide. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler. The hardware devices described above may be configured to act as one or more software modules to perform the operations of the present invention, and vice versa.

100: noise improvement device
110: head unit
120: central gateway
130: wireless charger

Claims (14)

a head unit having an audio device;
a central gateway receiving an audible frequency of the audio device when the audio device is operated; and
A wireless charger that changes to one of a plurality of charging center frequencies to improve noise according to the listening frequency; includes,
The charging center frequency is selected within a charging frequency changeable range in consideration of hardware time constants for a plurality of coils.
According to claim 1,
The wireless charger,
a controller that determines one charging center frequency for avoiding the listening frequency and performs charging power control with the charging center frequency; and
and a coil switch for selecting one of a plurality of coils radiating charging power according to the charging power control.
According to claim 2,
The noise amelioration device, characterized in that the determination of the charging center frequency is made according to the listening frequency in consideration of noise generation in the multiplication band of the charging center frequency.
delete According to claim 2,
The head unit transmits guide information prior to execution of charging at the charging center frequency.
According to claim 5,
The noise amelioration device, characterized in that the guide information is at least one of text, graphics and voice.
According to claim 1,
A noise amelioration device, characterized in that the display of the head unit is provided with a forced noise reduction button for executing forced noise reduction by a user input.
According to claim 7,
The noise improvement device, characterized in that the forced noise reduction is reset to off when the accessory is turned off.
According to claim 1,
Noise improvement device, characterized in that for improving the noise, a spread spectrum clocking (SSC) method is used to change the plurality of charging frequencies according to time.
an audio operation step in which the audio device of the head unit is operated;
a reception step in which a central gateway receives an audible frequency from the audio device; and
A changing step of changing, by the wireless charger, to one of a plurality of charging center frequencies to improve noise according to the listening frequency;
The charging center frequency is selected within a charging frequency changeable range in consideration of hardware time constants for a plurality of coils.
According to claim 10,
The change step is
determining, by a controller, one charging center frequency for avoidance of the audible frequency;
performing, by the controller, charging power control with the charging center frequency as a result of the determination; and
and selecting, by a coil switch, one of a plurality of coils radiating charging power according to the charging power control.
According to claim 11,
The noise improvement method, characterized in that the determination of the charging center frequency is made according to the listening frequency in consideration of noise generation in the multiplication band of the charging center frequency.
delete According to claim 11,
The change step is
and transmitting, by the head unit, guide information prior to execution of charging at the charging center frequency.

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