KR102605549B1 - Wireless charging safety management system - Google Patents

Abstract

The present invention provides a wireless charging safety management system that includes a transmitter for wirelessly transmitting power to electric vehicle vehicles and a CCTV camera system for detecting abnormal situations by constantly filming a wireless charging parking area.

Description

Wireless charging safety management system {Wireless charging safety management system}

The present invention relates to a wireless charging safety management system.

Wireless charging for electric vehicles consists of a wireless charging transmitter installed in the wireless charging area and a wireless charging receiver attached to the wireless vehicle. The wireless charger transmitting end consists of a power circuit and a wireless charging transmitting end pad, and the wireless charging receiving end consists of a wireless charging receiving end pad inside the vehicle, a receiving end circuit, and a battery.

Generally, the wireless charging transmitter pad is embedded at the same height as the road surface of the parking area (flush ground mounting) so as not to interfere with the operation of the wireless charging vehicle.

As shown in Figure 1, the principle of the wireless charging system is that the DC-AC inverter at the transmitting end converts it to AC at a frequency of, for example, 85 kHz and transmits power in an electromagnetic manner through the coil at the transmitting end, and at the receiving end, the electromagnetic energy sent from the transmitting end is transmitted to the coil (pad) at the receiving end. ), convert the electromagnetic waves into DC power with a rectifier, convert it to battery voltage through a power converter, and store it in the battery. Here, unlike wired charging, in wireless charging, the distance between the coil (pad) at the transmitting end and the coil (pad) at the receiving end is more than 15 cm, so various stability problems may occur.

Since the charging pad of the wireless charging transmitting end generates powerful electromagnetic waves of hundreds of volts and transmits power to the wireless charging receiving end, if foreign substances exist between the charging pad of the transmitting end and the receiving end during wireless charging, especially substances that react to electromagnetic waves (e.g. (For example, metal coins, silver foil, etc.), there is a high possibility that the foreign matter will absorb electromagnetic waves, generate heat, and cause a fire.

Figure 2 shows the analysis of the impact of foreign objects (FO) by silver metal. When a metallic foreign object (Metallic FO) is inserted between the transmitting end and the receiving end coil, the magnetic field (H1) generated by the transmitting end coil current (I1) is induced to generate a current (I2) inside the metal when it passes through the metal area. Electromotive force (EMF) is generated. The current (I2) on the metal is ring-shaped and is defined as an eddy current. Then, a new magnetic field (H2) is created by the current (I2) and is formed in the opposite direction to the change in the original magnetic field (H1). For this reason, the existing inductance (L1) and resistance (R1) are changed into inductance (L'1) and resistance (R'1), and the overall changed impedance (Z'1) is expressed as follows.

As a result, if impedance changes occur unintentionally in the resonator stage, efficiency reduction, heat generation, and circuit threats (breakdown, destruction, fire, etc.) may occur. Therefore, the technology to detect metallic foreign substances (MOD, Metallic Object Detection) during wireless charging of electric vehicles has become a key to the commercialization of wireless charging, and is also specified as a technology that must be complied with in the standards of industry standardization organizations such as SAE (Society for Automotive Engineers). It is done.

In addition to detecting metallic foreign substances, living object detection (LOD) is also an important technology for the safety of living things. For example, if a small creature (dog, cat, etc.) enters the transmitter pad and the receiver pad, or if a person with an artificial pacemaker approaches a wireless charging electric vehicle, the electromagnetic waves generated by the wireless charger may be affected. There is a risk that the artificial pacemaker may malfunction.

Therefore, when wireless charging electric vehicles, wireless charging area safety management functions are needed, such as foreign matter management and resulting fire management, and detection of people, animals, etc. around the charging area where high-power electromagnetic waves are generated.

A wireless charging area is an area where a wireless charger is installed within a parking area where wireless charging vehicles can park. The wireless charger consists of a charger body and a charging pad, and multiple charging pads can be connected to one charger body. Therefore, a wireless charging area can be operated by installing charging pads in several parking areas near where the wireless charger main body is installed. At this time, a wireless charging area safety management function is necessary.

In general, there may be technology that detects the presence of foreign substances, life detection, fire detection, etc. using optical methods using CCTV images. Generally, wireless charging areas are mainly installed in parking lots, and parking lots are equipped with CCTV cameras to prevent vehicle accidents. The main purpose of installed CCTV cameras is to secure video for later evidence in the event of an accident, so they are generally installed for long-distance shooting so that they can film the entire parking lot or a large area.

In another method, the wireless charger transmitting end transmits power through electromagnetic waves to the wireless charging receiving end and detects changes in impedance of the electromagnetic wave to determine whether foreign substances exist between the transmitting end and the receiving end. A representative detection circuit technology from a circuit perspective is a method using a balanced coil. This method can be applied for FOD while the wireless charging transmitter is transmitting power, that is, when wireless charging is in progress.

However, the method of checking for life as well as metallic foreign substances between the transmitting end of the wireless charger and the transmitting end using detection circuit technology from a circuit perspective is when the wireless charging starts, that is, the receiving end vehicle is located above the transmitting end, and the transmitting end recognizes this. Therefore, it can be detected through the foreign matter detection sensing function at the point of transmitting power, and foreign matter present on the transmitting end cannot be detected before wireless charging begins. In addition, because it detects changes in impedance between the transmitting end pad and the receiving end pad, it does not have the function of recognizing living creatures around it.

Patent Publication No. 10-2015-0108829 discloses wireless charging that uses data from a visible light camera and a multi-zone temperature sensor to determine whether a foreign object, such as a metal object or animal, is in or adjacent to the source resonator. An object detection system for the system is disclosed. The camera detects foreign substances by analyzing the color tone of the image.

Patent Publication No. 10-2022-52433 discloses a technology for aligning cars to power supply pads using general images and thermal imaging cameras. However, these documents have limitations in accurately detecting foreign substances between the transmitting end and the receiving end and are unable to provide a safety management system with complex functions.

The present invention automatically detects foreign substances at all times and notifies the manager even when there is no vehicle at the receiving end for a wireless charging facility with built-in CCTV installed in a parking area, thereby reducing the risk of fire due to foreign substances in advance and providing a wireless charging system. It can maintain an operable state at all times, and it can reduce the risk caused by electromagnetic waves by notifying people near the wireless charging vehicle of the risk of electromagnetic waves generated during wireless charging. It can also reduce the risk of electromagnetic waves even in unmanned parking lots where managers are not always present. The purpose is to provide a wireless charging safety management system that can detect essential elements for safety management, such as fire that occurs during charging, at an early stage.

In order to achieve the above-mentioned object, the present invention provides a wireless charging safety management system that includes a transmitter for wirelessly transmitting power to electric vehicles and a CCTV camera system for detecting abnormal situations by constantly filming the wireless charging parking area. to provide.

The system: calculates the average pixel value by multiplying the pixel value at each location of the video frame acquired through a CCTV camera by the frame weight according to time and adding the resulting value, and creates an average image with the average pixel value at all locations in the image. Obtaining and registering as a background image; Obtaining a difference in pixel values at each location between the background image and the current frame and obtaining a difference image using the pixel value at that location; In the difference image, obtain a foreground area mask image with a value of 1 if the pixel value is above the given threshold value and 0 if the pixel value is below the threshold value. In the foreground area mask image, pixels with a value of 1 are gathered within a certain distance to form an area. registering the corresponding area as a foreground area when forming; Obtaining a foreground area image by obtaining pixel values corresponding to the registered foreground area from the current frame; And a detection step can be performed to specify objects such as a wireless charging vehicle, a living creature, or a foreign substance entering the wireless charging area through the detected foreground area.

Specify the location of the wireless charging transmitting pad in the wireless charging parking area in the CCTV camera video and determine whether the object detected based on the image exists in the area. If a living thing or foreign substance exists in the area, the status of the wireless charging system and wireless charging transmitter An alarm signal can be transmitted to the indicator.

By detecting the foreground area with a CCTV camera, the state of vehicle entry into the wireless charging parking area is confirmed, and the license plate information of the entering wireless charging vehicle is recognized to provide information on the entering wireless charging vehicle and information on the wireless charging parking area being entered. By transmitting to the wireless charging system, the wireless charging system can handle wireless charging-related tasks.

If the color or shape information in the foreground area detected by the CCTV camera has flame or smoke characteristics, it can be detected as a fire and the fire information can be sent as an alarm to the wireless charging system and wireless charging transmitter status indicator.

The wireless charging transmitter status indicator displays a green light when the wireless charging parking area is normal, and a red light when an abnormality occurs, providing information to the driver of the wireless charging vehicle in advance about whether the charging area is normal. It can also include a speaker function. there is.

If the object detected in the foreground area is a person or animal through CCTV image processing, an alarm can be displayed on the wireless charging transmitter plaque indicator and a pre-recorded guidance voice or alarm sound can be broadcast.

If the wireless charging area is in an error state, schedule information is provided so that the manager or field worker can efficiently remove foreign substances on the wireless charging transmitters based on the status information of foreign substances on all installed wireless charging transmitters and the current wireless charging status information. can calculate and deliver wireless charging transmitter management task schedule information.

The charging vehicle and the charger pad are matched using a CCTV camera, and the vehicle number can be recognized by the CCTV camera and matched with the number received through the communication channel to determine consistency.

It may include a transmitting end pad having an LED array to indicate whether the charging state is present.

According to the present invention, the external environment of the wireless charging system can be photographed and image processed to determine whether there is an abnormality in the external environment of the wireless charging system, and depending on whether there is an abnormality, the situation can be communicated to the vehicle driver or surrounding people through the wireless charging transmitter status indicator. By proposing a solution, the safety and convenience of the wireless charging system can be improved.

Through video processing and analysis based on real-time video from CCTV cameras, the presence of foreign substances on the wireless charging transmitter is determined and communicated to the manager, thereby providing management information on the wireless charging parking area in the unmanned parking lot, providing a more effective wireless charging management function in the unmanned parking lot. can be provided.

In addition to the fire prevention function of the wireless charging system, fires caused by metal foreign substances on the wireless charging transmitter can be quickly detected and a fire alarm can be notified to the manager, enabling early response in the event of a fire, thereby minimizing property damage. can do.

1 is a diagram showing the principle of a wireless charging system;
Figure 2 is a diagram showing analysis of the impact of foreign objects (FO) by silver metal;
Figure 3 is an overall configuration diagram of the wireless charging safety management system of the present invention;
Figure 4 is a diagram showing the operation sequence and algorithm of the wireless charging safety management system of the present invention;
Figure 5 is a diagram showing obtaining an average image in the present invention;
Figure 6 is a diagram showing that in the present invention, a differential image between the average image and the current frame is obtained, and then a foreground region is extracted from which noise is removed using thresholding and morphology image processing;
Figure 7 is a diagram showing detection of the type of object in the foreground area of the present invention;
Figure 8 is a diagram showing an implementation example of the wireless charging safety management system of the present invention;
Figure 9 is a diagram showing pairing of a wireless charging transmitter pad and an electric vehicle in the wireless charging configuration of the present invention; and
Figure 10 is a diagram showing a case where a wireless charging transmitter pad and an electric vehicle are paired and there is a pairing error.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 3 is an overall configuration diagram of the wireless charging safety management system 1 of the present invention. The system (1) of the present invention includes a wireless charging system (2), a wireless charging management system (4), a control unit (10) connected wirelessly or wired to them, a CCTV camera unit (12), and a wireless charging transmitter status indicator unit. (14), including an image processing unit 16 and a communication unit 18.

The control unit 10 is a module that controls each unit module to operate the entire function of the wireless charging safety management system 1. It is linked with a CCTV camera and receives the CCTV camera video and transmits it to the video processing unit 16. A wireless charging transmitter is used to alert the driver of the vehicle or people near the charging vehicle according to the results detected based on the video by the video processing unit 16. Controls the status indicator unit 14. In addition, in order to transmit processing result data to the wireless charging system 2, it performs a function of transmitting data to the wireless charging system 2 through the communication unit 18.

The CCTV camera unit 12 consists of a CCTV camera for constantly filming the wireless charging parking area and detecting abnormal situations, and a module for controlling the camera. CCTV camera images are transmitted to the image processing unit 16 through the control unit 10. CCTV cameras are installed on the top of the parking area or on top of the wireless charger to simultaneously film multiple wireless charging parking areas where wireless charging transmitters are installed, or in the parking area of the wireless charging transmitter to film the wireless charging transmitter when a vehicle is charging in the parking area. It can be installed in a low position on the front or at the bottom of the wireless charger. In this way, the CCTV camera installation location can be located in various locations.

The image processing unit 16 receives images captured from CCTV cameras through the control unit 10, detects foreign substances and living creatures on the wireless charging transmitter, determines whether a vehicle is entering the wireless charging parking area, and determines the license plate number of the entering vehicle. When the vehicle is wirelessly charging, it detects whether any living things (animals, people, etc.) are close to the charging vehicle, and detects whether a fire occurs in the wireless charging parking area. The detected parking zone status result is transmitted to the control unit 10.

The wireless charging transmitter status indicator unit 14 consists of an alarm light to indicate normal and abnormal states and a speaker to transmit the alarm through sound. In this case, it may be composed of only an alarm light without a speaker.

The communication unit 14 transmits the status information about the wireless charging parking area received from the control unit 10 to the wireless charging management system 4 or the wireless charging system 2, or the wireless charging management system 4 or the wireless charging system. It includes a communication module for receiving information from (2) and transmitting it to the control unit 10.

The wireless charging management system (4) is a system for managing the status of wireless charging parking zones. It delivers information about wireless charging parking zones to managers through mobile devices or PCs, and provides overall status information about various wireless charging parking zones. It is a system created for management. If a fire is detected, it can perform a function to automatically contact the fire department, such as 119. The wireless charging management system 4 can be integrated into the system 1 of the present invention.

The wireless charging system (2) is an existing wireless charging system that performs a wireless charging function for a vehicle through a wireless charging transmitter and a receiver of a wireless charging vehicle, and the wireless charging safety management system (4) and wireless charging parking area proposed by the present invention Receive information about a vehicle entering the vehicle and perform communication for wireless charging in advance, when a fire occurs during wireless charging, when information is received that there is a foreign object on the wireless charging transmitter, or when there are people around the vehicle during wireless charging. It can be linked with the wireless charging safety management system (4) proposed in the present invention to stop wireless charging.

Next, the operating sequence and algorithm of the wireless charging safety management system 1 of the present invention will be described with reference to FIG. 4.

First, the system 1 starts to operate (S10).

Next, the current frame image is obtained using a CCTV camera (S12).

Next, the current and previous frame images are accumulated to obtain an average image (S14).

Specifically, as shown in FIG. 5, real-time frame images are decoded from CCTV cameras, and weights for each frame are added to each pixel value of the current frame image (fn) and the previous frame image (fn-1, ...fn-m). Find the average image by multiplying the values (Wn, …Wn-1, Wn) and adding them. The average image represents an image in which the pixel value for each position in the current frame and the previous frame is multiplied by the weight value for each frame, and generally represents a background area without movement. When calculating the average image, the weight value (W) that is multiplied for each frame is a value between 0 and 1, and the responsiveness to the latest frame can be increased by setting it to a higher value the closer it is to the frame being obtained. The average image can be registered as a background image.

Next, the differential image between the average image and the current frame is obtained (S16). The difference image represents an image obtained by calculating the difference in pixel values at each location between the current average image and the current frame.

Next, it is determined whether there is a foreground area in which the pixel value in the difference image is greater than or equal to the threshold (S18).

Steps S16 and S18 will be described in detail with reference to FIG. 6. A differential image between the average image and the current frame is obtained, and then noise is removed using image processing such as thresholding and morphology in the foreground area. Extract (Foreground region).

The difference image represents an image obtained by calculating the difference in pixel values at each location between the current average image and the current frame, and the foreground area represents an area where changes have occurred, unlike the fixed background screen. The average image is a background image without movement, and the difference image between the current frame and the average image has a high pixel value in the foreground area (i.e., an area with movement), so the pixel value corresponding to the foreground area has a high value. . Therefore, the foreground area can be obtained from the difference image through image processing such as threshold processing and morphology.

In the difference image, obtain a foreground area mask image with a value of 1 if the pixel value is above the given threshold value and 0 if the pixel value is below the threshold value. In the foreground area mask image, pixels with a value of 1 are gathered within a certain distance to form an area. If , the area can be registered as a foreground area. Additionally, the foreground area image can be obtained by obtaining the pixel value corresponding to the registered foreground area from the current frame.

If the foreground area does not exist, it means that there are no moving objects (vehicles, people, animals, etc.). Therefore, in step S50, it is checked whether the system is terminated. If confirmed, the operation of the system is terminated (S60), and if not terminated, the operation of the system is terminated (S60). Return to routine (S12) and repeatedly perform the image analysis function.

On the other hand, if the foreground area exists in step S18, the process proceeds to step S20, and the object type is detected based on the image in the current frame based on the foreground area (S20).

Specifically, Figure 7a shows an example of detection when a vehicle enters a wireless charging parking area by detecting the foreground area, Figure 7b shows an example of detection of a foreign object (animal) on a wireless charging transmitter pad, and Figure 7c shows a person detection while charging a vehicle in a wireless charging parking area. Show an example.

In Figure 7a, the central area where the vehicle is located among the images captured by the CCTV camera is “wireless charging transmitter guide area 1”. Obtain the average image based on the premise of the captured image, and obtain the difference between the pixel value of the “wireless charging parking zone guide area 1” in the current frame where the vehicle is stopped and the “wireless charging parking zone guide area 1” of the average image, then wireless charging An image of the vehicle consisting of high pixels inside the transmitter guide area is detected.

Likewise, in Figure 7b, the central area where the wireless charging pad is located among the images captured by the CCTV camera is “wireless charging transmitter pad guide area 1”. Obtain the average image based on the premise of the captured image, and obtain the difference between the pixel values of “wireless charging transmitter pad guide area 1” in the current frame and “wireless charging transmitter pad guide area 1” of the average image. Foreign matter (cat) made of high pixels images are detected.

Likewise, in Figure 7c, the central area where the wireless charging pad is located among the images captured by the CCTV camera is “wireless charging transmitter guide area 1”. Obtain the average image based on the premise of the captured image, and obtain the difference between the pixel value of the “wireless charging parking zone guide area 1” in the current frame where the vehicle is stopped and the “wireless charging parking zone guide area 1” of the average image, then wireless charging An image of a person consisting of high pixels inside the transmitter guide area is detected.

According to the present invention, step S20 first proceeds to step S22 to determine whether a foreign substance exists on the wireless charging transmitter. If a foreign substance is present, an alarm is displayed on the status indicator of the wireless charging transmitter, and the foreign matter information is transmitted to the wireless charging management system 4 (S32).

If no foreign matter exists, the process proceeds to step S24 and determines whether living creatures such as people or animals have been detected. When a living creature is detected, an alarm is displayed on the status indicator of the wireless charging transmitter, an alarm sound is sent through the speaker, and information about the living creature is transmitted to the wireless charging management system (4) (S34).

If no life is detected, the process proceeds to step S26 to determine whether it is a vehicle. If it is determined to be a vehicle, the vehicle license plate is recognized (S36), and the recognized vehicle number information is transmitted to the wireless charging management system 4 (S38).

After the end of step S38 and when it is determined that there is no vehicle, that is, when it is finally determined that there is no problem in the wireless charging management area, it is determined whether or not a fire has occurred in step S28. If the foreground area detected by a CCTV camera has flame or smoke characteristics in the color or shape information, it is detected as a fire. If it is determined that a fire has occurred, an alarm is displayed on the wireless charging transmitter status indicator and foreign matter information is transmitted to the wireless charging management system 4 (S380). Then, when it is determined that a fire has not occurred, the routine is joined and the logic proceeds to check whether the system is terminated at step S50. Fire detection is necessary because there is a risk of fire occurring due to metal foreign substances on the wireless charging transmitter.

Figure 8 is a diagram showing an implementation example of the wireless charging safety management system 1 of the present invention described above.

The management system server (S) and CCTV are connected to the wireless charging management system (4). The wireless charging transmitter status indicator 200 is installed at an appropriate location within the wireless charging area so as not to obstruct the path of the vehicle. As shown, the wireless charger status indicator 200 may include a red error status indicator, a yellow indicator indicating a caution state or a wireless charging standby state, a blue normal status indicator, and a speaker.

For example, an LED display unit 204 is installed surrounding the pad area of the wireless charging transmitter to indicate the operation of the wireless transmitter and is connected to the wireless charging management system 4. The LED display unit 204 lights up as soon as the wireless transmitter is driven, and turns off when wireless charging ends.

The management system server (S) is connected to the administrator's electronic device (200), such as a smartphone or PC, through a network and can deliver alarm information. If more than a certain number of wireless charging zones are in an error state compared to the total number of wireless charging zones, This may include providing information to managers or field personnel to remove foreign substances on the wireless charging transmitter. In addition, if the wireless charging area is in an error state, the manager or field worker can efficiently remove foreign substances on the wireless charging transmitters based on the information on the status of foreign substances on all installed wireless charging transmitters and the information on the current wireless charging status. Schedule information can be calculated and wireless charging transmitter management task schedule information can be delivered.

According to the present invention, if there is a foreign substance on the wireless charging transmitter according to the results of the parking area status detected through the image processing unit, an alarm indicator, for example, a red LED, indicating an abnormal state is displayed, so that the driver of the vehicle is alerted by the indicator. You can check before entering the charging area that wireless charging is not possible because the parking area is in an abnormal state. In this case, the driver of a wireless charging vehicle can determine whether charging is possible in the parking area in advance before entering the charging area. After entering a charging area where charging is not possible due to an abnormal condition, the driver of the wireless charging vehicle realizes that charging is not possible and removes the vehicle. It can provide more convenience than moving to another charging area.

In addition, if the object detected in the foreground area is a person or an animal, an alarm is displayed on the status indicator of the wireless charging transmitter and a pre-recorded guidance voice or alarm sound is broadcast, so that if the object is a person, the user can move after hearing the information broadcast. In the case of animals, movement can be encouraged through an alarm sound. The corresponding detection information and real-time video data are transmitted to the wireless charging management system 4 to deliver information to the manager, and the manager can manually make announcements.

As explained with reference to FIG. 7, when the object detected in the foreground area is a vehicle, the vehicle license plate area is detected and the license plate is recognized. The recognized vehicle number and vehicle entry information are transmitted to the wireless charging management system (4) for subsequent processing through linkage with the wireless charging system (2). For example, in the case of a vehicle subscribed to a wireless charging service, information is transmitted to the wireless charging payment app on the vehicle driver's registered smartphone to perform pre-processing or various convenience information (e.g. automatic payment after charging, etc.) can do.

According to the ISO 15118 standard, the wireless charging system and wireless charging vehicle must be able to proceed with wireless charging by exchanging information with each other via WiFi wireless (ISO 15118-8, ISO 15118-9) when the wireless charging process begins. At this time, as shown in Figure 9, the wireless charging transmitter pad 1 (110) must be paired with electric vehicle number 1 (EV1), and the wireless charging transmitter pad 2 (112) must be paired with electric vehicle number 2 (EV2).

However, due to the nature of the wireless channel, there is a possibility that wireless charging transmitter pad 1 (110) may be paired with electric vehicle number 2 (EV2). To prevent such cases, CCTV cameras can recognize the vehicle's license plate information and induce accurate pairing.

Figure 10 shows a case of correct pairing between electric vehicle number 1 (EV) and wireless charging transmitter pad 1 (110) and a case where an error occurred due to pairing between electric vehicle number 2 (EV) and wireless charging transmitter pad 1 (110). . In the case where electric vehicle number 2 (EV2) and wireless charging transmitter pad 1 (110) are paired, the transmitter CCTV recognizes the number of electric vehicle number 1 (EV1), but the number of electric vehicle number 2 (EV2) is not recognized through WIFI communication. This is the case when it is delivered. If the vehicle number does not match like this, it cannot be considered that accurate pairing has occurred.

If the detected foreground area is a fire, a fire alarm is broadcast through alarm indicators and sounds such as the LED of the wireless charging transmitter status indicator, and fire information is transmitted to the wireless charging management system (4) to automatically deliver information to fire departments such as 119. This allows for a quick response. In addition, it quickly delivers real-time video and fire alarms to managers through mobile phones, PCs, etc., enabling early response to fires.

When a vehicle is wirelessly charging after entering the wireless charging area, if a person or animal other than the vehicle approaches the charging vehicle, it can be detected through objects in the foreground area. If a person approaches the charging vehicle while the vehicle is charging wirelessly, the wireless charging transmitter status indicator can alert the person to the danger that wireless charging is currently in progress in the parking area. At this time, it is possible to recognize that the vehicle is currently charging wirelessly through the speaker of the wireless charging transmitter status indicator. Generally, during wireless charging, electromagnetic waves generated through the wireless charging transmitter are absorbed by the receiver of the wireless charging vehicle and converted into electricity, but some electromagnetic waves are emitted to the surroundings. In particular, depending on the degree of matching between the wireless charging transmitter and the receiver of the wireless charging vehicle, the amount of electromagnetic waves generated in the surroundings may increase. In this case, it can be dangerous for people near the charging vehicle to have electronic life support devices such as pacemakers. Therefore, when a vehicle is wirelessly charging, it becomes a very important function to notify nearby people that the vehicle is wirelessly charging.

According to the present invention, unlike the wireless charging transmitter status indicator, charging status can be displayed through the charging status display LED 206 as shown in FIG. 10 in the main area including the wireless charging transmitter pad. In this case, the charging status display LED 206 displays a green light indicating normal, and when a person approaches the wireless charging vehicle, the LED displays red and green lights alternately, indicating that the vehicle is wirelessly connected to the approaching person. It may indicate that it is charging and may be dangerous. The charging status display LED 206 is installed, for example, in a circular shape with a large light emitting area, so a sufficient warning effect can be expected.

Although the preferred embodiments of the present invention have been described above, it is obvious that various changes and modifications can be made to the present invention and that the scope of the rights of the present invention extends to the same or equivalent area as the claims described below.

Claims (10)

A wireless charging safety management system that includes a transmitter for wirelessly transmitting power to electric vehicle vehicles and a CCTV camera system for detecting abnormal situations by constantly filming the wireless charging parking area.
The average pixel value is obtained by multiplying the pixel value for each location of the video frame acquired through a CCTV camera by the frame weight according to time and adding the resulting value. The average image with the average pixel value at all locations in the image is obtained to create the background image. registering with;
Obtaining a difference in pixel values at each location between the background image and the current frame and obtaining a difference image using the pixel value at that location;
In the difference image, obtain a foreground area mask image with a value of 1 if the pixel value is above the given threshold value and 0 if the pixel value is below the threshold value. In the foreground area mask image, pixels with a value of 1 are gathered within a certain distance to form an area. registering the corresponding area as a foreground area when forming;
Obtaining a foreground area image by obtaining pixel values corresponding to the registered foreground area from the current frame; and
Perform a detection step to specify objects such as wireless charging vehicles, living creatures, or foreign substances entering the wireless charging area through the detected foreground area,
By detecting the foreground area with a CCTV camera, the state of vehicle entry into the wireless charging parking area is confirmed, and the license plate information of the entering wireless charging vehicle is recognized to provide information on the entering wireless charging vehicle and information on the wireless charging parking area being entered. is transmitted to the wireless charging system,
It matches the charging vehicle and the charger pad with a CCTV camera, recognizes the vehicle number with a CCTV camera, matches it with the number received through the communication channel, determines consistency, and induces wireless charging between the charging vehicle and the paired charger pad. Wireless charging safety management system. delete According to clause 1,
Specify the location of the wireless charging transmitting pad in the wireless charging parking area in the CCTV camera video and determine whether the object detected based on the image exists in the area. If a living thing or foreign substance exists in the area, the status of the wireless charging system and wireless charging transmitter Wireless charging safety management system that delivers an alarm signal to the indicator. delete According to clause 1,
A wireless charging safety management system that detects fire when the color or shape information in the foreground area detected by a CCTV camera has flame or smoke characteristics and sends an alarm to the wireless charging system and wireless charging transmitter status indicator. According to any one of claims 3 or 5,
The wireless charging transmitter status indicator displays a green light when the wireless charging parking area is normal, and a red light when abnormal, providing information to the driver of the wireless charging vehicle in advance about whether the charging area is normal. Charging safety management system. According to clause 6,
A wireless charging safety management system that displays an alarm on the wireless charging transmitter plaque indicator and broadcasts a pre-recorded guidance voice or alarm sound when an object detected in the foreground area through CCTV image processing is a person or animal. According to clause 7,
If the wireless charging area is in an error state, schedule information is provided so that the manager or field worker can efficiently remove foreign substances on the wireless charging transmitters based on the status information of foreign substances on all installed wireless charging transmitters and the current wireless charging status information. A wireless charging safety management system that calculates and delivers wireless charging transmitter management work schedule information.
delete According to clause 8,
A wireless charging safety management system including a transmitter pad with an LED array for indicating the charging status.