KR102283130B1 - A method of reducing stand-by current of wireless power transmitting device - Google Patents

Abstract

The present invention relates to a method for reducing standby current of a wireless power transceiver, and more particularly, a battery capable of wireless power transmission for charging a battery pack through wired and wireless charging and wirelessly charging another device using the charged battery pack. It relates to a method for reducing standby current of a wireless power transceiver for reducing standby current in a pack.
According to the present invention, a battery pack capable of wireless power transmission can maintain a minimum power consumption while waiting in standby mode for most of the time except when power transmission for actual charging occurs, thereby preventing unnecessary power consumption. there is

Description

Method for reducing standby current of wireless power transceiver {A METHOD OF REDUCING STAND-BY CURRENT OF WIRELESS POWER TRANSMITTING DEVICE}

The present invention relates to a method for reducing standby current of a wireless power transceiver, and more particularly, a battery capable of wireless power transmission for charging a battery pack through wired and wireless charging and wirelessly charging another device using the charged battery pack. It relates to a method for reducing standby current of a wireless power transceiver for reducing standby current in a pack.

In a typical wireless charging system, standby current consumption is relatively insignificant because the wireless power transmitter is connected to a constant power source, but in a wireless charging system, standby current consumption becomes important because the wireless power transmitter is connected to battery power.

In a typical wireless charging system, the wireless power transmitter continuously checks whether the wireless power receiver is in a ready state, and consumes current in this process. In the case of wireless power transmission using a charged battery pack, the current consumed to check whether the wireless power receiver is in a ready state can have a very large effect on the total usage time, and reducing this standby current It can play an important role in increasing time.

The Qi standard, a wireless charging method of the World Wireless Charging Association (WPC), a wireless power transfer association, requires that the current consumption related to the standby mode follow the Energy Star recommendation.

1 is a conceptual diagram illustrating a change state of a wireless power transmission/reception mode according to the prior art. The World Wireless Charging Association defines a selection mode, a ping response mode, an identification and configuration mode, and a power transfer mode as shown in FIG. 1 .

In the case of standby mode, it may be included in the selection mode according to the intention of the manufacturer, but the specific implementation method is not specified.

The selection mode is a step for determining whether the wireless power transmitter and the wireless power receiver are in contact. The meaning of contact means that the transmitting device and the receiving device approach within a physical distance that can transmit power.

The ping response mode refers to a mode in which the wireless power transmitter transmits a digital ping signal for checking whether a wireless power receiver is in contact with the wireless power receiver and receives a response from the wireless power receiver. If there is a valid response from the wireless power receiver, the identification and setting mode is entered. If there is no valid response, the mode is changed to selection mode.

The identification and setting mode is a step in which the wireless power transmitter communicates with the wireless power receiver to negotiate a set value such as maximum transmission power. If the setting value is successfully determined, the power transmission mode is changed, and if the setting fails, it is changed to the selection mode state.

The power transfer mode refers to a state in which actual power transfer occurs between the two devices.

On the other hand, it is true that it is not easy to replace batteries in wirelessly operated terminals such as various sensor devices, livestock monitoring devices, and temperature and humidity control devices used in the Internet of Things (IoT) field, particularly smart farms.

For example, when a sensor terminal is attached to the neck of a cow raised on a farm, in order to replace the battery, the entire terminal must be collected and the case is disassembled and then the battery is replaced. Even if the entire terminal is not collected, in order to replace the battery, it is common to disassemble the terminal and remove the battery cover before replacing the battery.

However, as wireless charging technology has been developed, transmission efficiency and power transmission have also increased, and a battery pack having a wireless power transmission function that does not require a physical cable and terminal can be used.

2 is a perspective view showing a coupling relationship between the wireless power transmitter and the wireless power receiver, and FIG. 3 is a block diagram showing the internal configuration of the wireless power transmitter and the wireless power receiver.

The wireless power receiver 120 receives power for internal operation from the separately separated wireless power transmitter 110 in a wireless manner. In the prior art, where wireless charging technology was not developed, the battery pack and the terminal used a wired charging method with contacts made of conductors. However, with the development of wireless charging technology, wireless charging has become possible without the need for external contact points to be exposed. The antenna should be positioned so that the center of the antenna coincides. The antennas of both devices are aligned with each other and perform a non-contact power supply operation according to the electromagnetic resonance principle.

The wireless power transmitter 110 is also called a battery pack, and wirelessly transmits the power of the first battery 112 therein to the wireless power receiver 124 of the wireless power receiver 120 through the wireless power transmitter 114 . send. The power thus received is stored by the second battery 122 of the wireless power receiver 120 , and the stored power is used in the circuit unit 123 . The first battery 112 of the wireless power transmitter 110 is charged by wire or wirelessly from an external power source, and power is supplied from a cable connected through the charging port 113 to charge the first battery 112 . .

The first CPU 111 of the wireless power transmitter 110 controls various circuits such as the first battery 112 and the wireless power transmitter 114, and is a central processing unit in which the wireless charging algorithm of the present invention is performed. The wireless power receiving unit 124 of the wireless power receiving device 120 receives the power transmission from the wireless power transmitting unit 114 to charge the second battery 122, and transmits the power of the second battery 122 to the circuit unit 123. and the second CPU 121 and the like. The circuit unit 123 is a part that performs a unique function of the wireless power receiver 120, also called a terminal, including a sensor and a communication device.

The wireless power transceiver 100 is used for measuring the position, motion, health state, etc. of each individual in a farm raising livestock such as cattle or pigs, and continuously powers while attached to the neck or body of the livestock. It provides a function to support the operation of equipment necessary to obtain information necessary for livestock management.

4 is a flowchart illustrating a process of a wireless power transmission/reception method according to the prior art, and FIG. 5 is a graph illustrating signal transmission/reception timing in the wireless power method according to the prior art.

When the wireless power transmitter 110 starts operation, the first CPU 111 enters the wireless power transmitter 110 into a selection mode. (S102)

In the selection mode, the first CPU 111 checks whether the wireless power receiver 120 approaches at a regular cycle. (S104)

When the wireless power receiver 120 approaches the wireless power transmitter 110, the first CPU 111 controls to enter the ping response mode. (S106) If the access signal is not detected, the wireless power transmitter 110 ) returns to selection mode.

In the ping response mode, it is checked whether there is a valid response from the wireless power receiver 120, and if there is no response, it is also returned to the selection mode. (S108) If there is a valid response, the identification and setting mode is entered. (S110)

The first CPU 111 controls the wireless power transmitter 110 and the wireless power receiver 120 to negotiate a setting value such as maximum transmission power while communicating with each other, and when the setting is successful, enters the power transmission mode. .(S112, S114)

In this state, actual power is transmitted and stored in the second battery 122 of the wireless power receiver 120 in a wireless manner. (S116)

When the voltage of the second battery 122 is fully charged and charging is completed, the first CPU 111 converts the wireless power transmitter 110 to a selection mode, and continuously checks whether recharging is required according to power use. (S118)

In addition, as shown in FIG. 5, the conventional charging mode setting timing shows the timing of a general wireless charging method. Conventionally, since the standby current of the wireless power transmitter 110 or the wireless power receiver 120 is not a consideration, the wireless power transmitter 110 checks whether the wireless power receiver 120 is in proximity to the charging state. to enter the selective mode as often as possible, for example, every 1 second. This is because when the wireless power transmitter 110 approaches the wireless power receiver 120, it can react immediately in almost real time.

In addition, when the power transmission is completed, in the conventional timing, the wireless power receiver 120 consumes some power and continuously repeats the selection mode until the next temporary charging is possible, thereby consuming standby current.

The battery pack capable of wireless power transmission enables continuous use of the terminal while the wireless power transmission battery pack is connected by non-contact charging the battery included in the terminal including the wireless power receiver 120 once or several times. . In addition, when all the power of the battery pack is used up, it is possible to provide a usable environment without interrupting the operation of the circuit built into the terminal by replacing it with a new battery pack that has already been charged.

In addition, the use of the wireless power transmission battery pack can simplify the mechanical structure of the terminal. In other words, there is no need for a contact terminal to connect the battery pack and the main body of the terminal, the risk of short circuit is low because the connection part is not exposed, and various problems that can be caused by directly connecting the battery pack with the wrong voltage to the terminal can prevent

Therefore, the battery pack device using the wireless power transmission technology is advantageous for mechanical design such as waterproof and dustproof, and has the advantage of being able to design a variety of designs due to the high degree of freedom in design.

However, due to the decrease in efficiency due to wireless power transmission and the standby current of the wireless power transmission battery pack and the current consumption in the selection mode in a state in which the receiving device is fully charged, shortening of the usage time may be a problem compared to the wired charging method.

US 10-2017-0134015 A US 10-2017-0024737 A

The present invention for solving the above problems reduces the consumption of standby current in the standby mode, which is closely related to the total usage time of the terminal, and suppresses or adjusts the entry into the selection mode, thereby enabling the wireless power transmission battery pack to transmit power. An object of the present invention is to provide a method for reducing the standby current of a wireless power transceiver that reduces unnecessary power consumption in addition to power consumption for the purpose of increasing the overall battery pack charging power usage efficiency.

In addition, in order to prevent unnecessary entry into the selection mode, the proximity sensor is used to determine whether the wireless power transmitter and the wireless power receiver are approaching, and the standby current reduction method of the wireless power transmitter and receiver is allowed to enter the selective mode only when proximity is made. aims to provide

In addition, after the wireless power receiver is fully charged in a state in which the wireless power receiver is in proximity, the additional selection mode entry is minimized, and the wireless power receiver is recharged while the wireless power transmitter waits from the standby mode to the minimum power consumption mode When this is necessary, an object of the present invention is to provide a method for reducing standby current of a wireless power transceiver to minimize standby current consumption by increasing the active period of the selection mode.

The present invention, devised to solve the above problems, is a wireless power transmitter 110' for transmitting power in a wireless charging method according to the Qi standard, which is a wireless charging method, and wireless power reception for receiving power according to the Qi standard. In order to transmit/receive power using the device 120 and reduce power consumed in a standby state for transmitting/receiving power, the proximity of the wireless power transmitter 110 and the wireless power receiver 120 is detected. As a standby current reduction method, when the first CPU 111 of the wireless power transmitter 110 ′ is initialized, the wireless power transmitter 110 ′ enters a standby mode under the control of the first CPU 111 . first step; a second step of continuously detecting whether the proximity sensor 115 included in the wireless power transmitter 110' is in proximity to the wireless power receiver 120 in the standby mode; When the proximity sensor 115 detects the proximity of the wireless power receiver 120 and generates a proximity signal, the first CPU 111 controls the wireless power transmitter 110 ′ to enter a selection mode. a third step; The first CPU 111 checks whether charging of the second battery 122 included in the wireless power receiver 120 is required, and the amount of power charged in the second battery 122 is below a certain level. a fourth step of controlling the first CPU 111 to enter the ping response mode by the wireless power transmitter 110 ′; a fifth step of controlling the first CPU 111 to enter the identification and setting mode by the first CPU 111 when the first CPU 111 receives a valid response in the ping response mode; When authentication for the wireless power receiver 120 is completed in the identification and setting mode, the first CPU 111 controls the wireless power transmitter 110 ′ to enter the power transmission mode, a sixth step and ; When the supply of power from the first battery 112 included in the wireless power transmitter 110 ′ to the second battery 122 of the wireless power receiver 120 is completed, the first CPU 111 is and a seventh step of controlling the wireless power transmitter 110 ′ to enter a standby mode after the waiting time step.

The proximity sensor 115 is a magnet sensor configured to check whether proximity by causing a change in a magnetic field according to the contact of a magnetic material or metal included in the wireless power receiver 120; an ultrasonic sensor configured to detect an ultrasonic signal reflected from the contacting wireless power receiver 120 to confirm proximity; an illuminance sensor configured to detect a change in illuminance that varies depending on the contact of the wireless power receiver 120 to confirm proximity; a detachable sensor configured to mechanically generate a signal according to contact with the wireless power receiver 120 to confirm proximity; It is characterized in that it consists of any one of.

In the seventh step, when the supply of power to the second battery 122 is completed, the ping response mode, the identification and setting mode, and the power transmission mode are sequentially entered, and then the standby mode is entered.

When the authentication for the wireless power receiver 120 fails in the sixth step, the first CPU 111 transmits a charge cancel message and then controls to return to the standby mode, and the standby mode is the proximity sensor It is characterized in that it continues until the proximity signal of (115) is released.

According to the present invention, a battery pack capable of wireless power transmission can maintain a minimum power consumption while waiting in standby mode for most of the time except when power transmission for actual charging occurs, thereby preventing unnecessary power consumption. there is

1 is a conceptual diagram illustrating a change state of a wireless power transmission/reception mode according to the prior art;
2 is a perspective view illustrating a coupling relationship between a wireless power transmitter and a wireless power receiver;
3 is a block diagram showing the internal configuration of a wireless power transmitter and a wireless power receiver.
4 is a flowchart illustrating a process of a wireless power transmission/reception method according to the prior art.
5 is a graph illustrating signal transmission/reception timing in a wireless power method according to the prior art;
6 is a conceptual diagram illustrating a change state of a wireless power transmission/reception mode according to an embodiment of the present invention.
7 is a perspective view showing the structure of a wireless power transmitter used in the present invention.
8 is a block diagram showing the internal configuration of a wireless power transmitter and a wireless power receiver of the present invention.
9 is a flowchart illustrating a process of a wireless power transmission/reception method of the present invention.
10 is a graph illustrating signal transmission/reception timing in the wireless power method of the present invention.

Hereinafter, "a method for reducing standby current of a wireless power transceiver apparatus" (hereinafter referred to as a 'standby current reducing method') according to an embodiment of the present invention will be described with reference to the drawings.

6 is a conceptual diagram illustrating a change state of a wireless power transmission/reception mode according to an embodiment of the present invention, FIG. 7 is a perspective view showing the structure of a wireless power transmission device used in the present invention, and FIG. 8 is a wireless power transmission device of the present invention and a block diagram showing the internal configuration of the wireless power receiver.

The wireless power transceiver 100' of the present invention includes the components included in the device according to the prior art as it is, and is used to check whether the wireless power transmitter 110' and the wireless power receiver 120 are in proximity. It is characterized in that it further includes a proximity sensor (115). Other components except for the proximity sensor 115 are the same as in the prior art, and a change is added to the mode setting including the standby mode according to the charging algorithm of the first CPU 111 .

The proximity sensor 115 of the wireless power transmitter 110' is a sensor for determining whether the wireless power receiver 402 is in proximity, and various sensors such as a magnet sensor, an ultrasonic sensor, an illuminance sensor, and a detachment sensor may be used. . The proximity sensor 115 is a sensor for detecting proximity or contact between the wireless power transmitter 110 ′ and the wireless power receiver 120 , and according to the detection result of the proximity sensor 115 , the wireless power transmitter 110 . ') is changed from standby mode to selection mode.

As shown in FIG. 7 , the proximity sensor 115 is preferably installed on a surface in contact with the wireless power receiver 120 among the surfaces of the wireless power transmitter 110 ′. The proximity sensor 115 of the wireless power transmitter 110 ′ functions to detect when the wireless power receiver 120 approaches within a predetermined interval capable of wireless charging.

Proximity sensor 115 may be a magnetic sensor, and is configured to check whether proximity by causing a change in a magnetic field according to contact of a magnetic material or metal included in the wireless power receiver 120 .

In addition, the proximity sensor 115 may be an ultrasonic sensor, and is configured to detect an ultrasonic signal reflected from the contacting wireless power receiver 120 to determine whether the proximity sensor is in proximity.

In addition, the proximity sensor 115 may be an illuminance sensor, and is configured to detect a change in illuminance (mainly to detect sudden darkening) depending on the contact of the wireless power receiver 120 to confirm proximity.

In addition, the proximity sensor 115 may be a detachable sensor, and is configured to mechanically generate a signal according to contact with the wireless power receiver 120 to check whether the proximity sensor is in contact.

Although some examples have been described as a configuration for checking whether the wireless power transmitter 110' and the wireless power receiver 120 are in proximity, in addition, if it is a means that can detect the approach or contact of a specific structure with the use of small power It may be used as the proximity sensor 115 of the present invention.

9 is a flowchart illustrating a process of a wireless power transmission/reception method of the present invention, and FIG. 10 is a graph illustrating signal transmission/reception timing in the wireless power method of the present invention.

The present invention includes the conventional wireless charging mode such as a selection mode, a ping response mode, an identification and setting mode, and a power transmission mode in the same manner, but is configured to transition to a selection mode by adding a standby mode.

When the first CPU 111 of the wireless power transmitter 110' is initialized, the wireless power transmitter 110' enters a standby mode. In the standby mode, if the proximity signal of the proximity sensor 115 does not occur, it does not enter the selection mode for charging and continues to wait.

The standby mode described in the present invention refers to a state in which any kind of power transmission including a digital ping signal is not performed, and the wireless power transmitter 110 enters the selection mode through an interrupt or periodic sensor check. state of deciding whether to

When the proximity signal of the wireless power receiver 120 is generated from the proximity sensor 115, it enters a selection mode to start wireless charging. The subsequent process transitions to the ping response mode, the identification and setting mode, and the power transmission mode in the same way as in the conventional method, and starts charging. If an error occurs in this process, it returns to the standby mode after returning an Abort Charging message stating that charging is canceled due to one of the causes of an unauthorized receiver, circuit error, or fire.

When charging is completed without error during the charging process, it returns to the standby mode after returning a Full Charging message. In the case of returning to the standby mode after returning the charge cancellation message, it is determined that the wireless power receiving device 120 is an unauthorized terminal until the proximity signal of the proximity sensor 115 is released (with the receiving device of the corresponding terminal). Until the transmitter is disconnected), do not perform any further operations.

In the case of returning to the standby mode after returning the charging completion message, it is determined that the charging has been completed normally, and after passing through the charging operation stop state for a certain period of time, it enters the selection mode to start recharging. In the selective mode, regardless of whether it enters the Receiver Attached message or the Resume Charging message, charging is attempted in the same ping response mode, identification and setting mode, and power transmission mode as in the conventional method, After repeating this process only once, it transitions to standby mode.

The reason for performing only one time is to determine the recharging period after being fully charged in the standby mode.

In the conventional method, it stayed in the selection mode even after full charge and attempted to enter the ping response mode continuously (for example, at intervals of 1 second). The reason for doing this is to continuously charge the wireless power receiver 120 to maintain a fully charged state. However, regardless of whether the second battery 122 is fully charged or the charging voltage has dropped below a certain level, a standby current of about 50 mW is generally continuously consumed in the process of continuously attempting charging. Even 50mW class standby current can act as unnecessary waste if accumulated. In the wireless power transmission/reception system, the power stored in the first battery 112 should be transmitted to the second battery 122 as much as possible, and the standby current causes the power of the first battery 112 to be consumed by itself. There is a need.

Since the current consumption of the proximity sensor 115 can be configured in a circuit of 5 ㎼ or less regardless of the type of sensor such as a magnetic sensor or a detachable sensor, the standby current using the proximity sensor 115 is thousands of times more efficient than the conventional method. could be an improvement.

In addition, if the process of trying the ping response mode in the selection mode is taken as an example, if the period is increased from the conventional 1 second interval to 10 minutes (600 seconds) or 60 minutes (3600 seconds) intervals, even in a fully charged state, 50 mW of standby current consumption can be saved hundreds of times or more. For example, even if a portion of the power of the second battery 122 of the wireless power receiver 120 is used for 10 minutes (600 seconds) in a fully charged state and becomes 95% charged, and then charging starts, the entire service There is no need to enter the ping response mode every 1 second because it does not interfere with the duration of the ping.

Such a charging algorithm will be described with reference to FIG. 9 .

When the wireless power transmitter 110' starts operation, it enters the standby mode first. (S202) In the standby mode, only the proximity sensor 115 operates, and other components do not operate, thereby reducing the use of standby power. can be minimized

During the standby mode, the proximity sensor 115 determines whether the wireless power receiving device 120 is in proximity (S204), and if there is no detection signal, the wireless power receiving device 120 is not in close proximity yet, so the standby mode keep the status quo

When a proximity signal is detected by the proximity sensor 115, since the wireless power receiver 120 is in close proximity and power transmission/reception is possible, the first CPU 111 enters the wireless power transmitter 110' into the selection mode. (S206)

In the selection mode, it is checked whether the charging of the second battery 122 is required to enter the ping response mode (S208). If it is, the first CPU 111 enters the standby mode while maintaining the standby state for a predetermined time (S210).

When the amount of power charged in the second battery 122 is below a certain level, the first CPU 111 enters the wireless power transmitter 110' into the ping response mode. (S212) And from the wireless power receiver 120 It is checked whether a valid response is transmitted (S214).

When the first CPU 111 receives a valid response in the ping response mode, the first CPU 111 performs identification and setting mode entry, which is a step of authenticating whether the wireless power receiver 120 is a device that is allowed to charge. .(S216)

If authentication fails, the wireless power receiver 120 is an unlicensed device, so it waits while checking the proximity sensor 115 until the wireless power receiver 120 moves away from the wireless power transmitter 110' It moves to standby mode, which is the initial stage. If the authentication is successful, it enters into a power transmission mode in which actual charging is performed (S220).

In the power transmission mode, while the power of the first battery 112 is transmitted to the second battery 122 in a wireless charging method, the wireless power receiver 120 is charged. (S222)

In the power transfer mode, it is checked whether charging is complete during charging, and if the charging is not completed, the proximity sensor 115 checks whether the proximity state is continued, and if the proximity state is maintained, the charging state is continuously maintained in the power transfer mode.

If it is confirmed that the proximity sensor 115 is in a fallen state, since the wireless power receiver 120 is spaced apart, it moves to the standby mode, which is an initialization step. When charging is complete, it enters the standby mode, which is the initialization step, after waiting for a predetermined period of time. (S224) When charging is completed, the standby mode is entered again after the waiting stage for a predetermined time, it is determined whether the next charging is necessary. If charging is not required, it re-enters the standby stage for a certain period of time, and re-enters the ping response mode and identification and setting mode when charging is required.

10 shows the timing of the wireless charging mode.

That is, in the conventional charging mode setting timing, it is continuously checked whether the wireless power receiver 120 is in proximity. In particular, proximity is checked through signal transmission and reception in the selection mode, and a considerable amount of standby power is consumed in this process.

However, in the present invention, the standby mode is additionally created before entering the selection mode, and the standby mode does not enter the selection mode and waits until the state of the proximity sensor 115 approaches. By doing so, power consumption can be reduced to 5 ㎼ class, which is the current consumption of the proximity sensor 115, whereas the conventional selection mode consumes a standby current of 50 mW class.

When the state of the proximity sensor 115 becomes 'proximity', since it is confirmed that the wireless power receiver 120 is close, it enters a selection mode in which it is possible to check whether wireless power transmission and reception is possible. And as soon as it enters the selection mode, it enters the ping response mode, and enters the power transmission mode, which is the actual power transmission stage, through the identification and setting mode.

When the power transmission is completed, the unnecessary standby current consumption is reduced by performing two selection modes at a preset specific time interval (eg, 10 minutes, 60 minutes, etc.). In this way, the intermediate rest period in the selective mode also waits in the additional standby mode. Thereafter, when the time comes when the wireless power receiver 120 needs charging, it enters the power transmission mode, which is the power transmission step, through the selection mode, the ping response mode, and the identification and setting mode.

In this way, the power transmission is short during the recharge period. When the state of the proximity sensor 115 is 'fallen' after a series of these processes, the wireless power receiver 120 is separated from the wireless power transmitter 110' and wireless charging is impossible, so it goes through a selection mode and waits. return to mode. In this way, one cycle of wireless charging can be repeated.

Although preferred embodiments of the present invention have been described with reference to the accompanying drawings, the technical configuration of the present invention described above is another specific form for those skilled in the art to which the present invention pertains without changing the technical spirit or essential features of the present invention. It will be understood that it can be implemented as Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the above detailed description, the meaning and scope of the claims, and All changes or modifications derived from the concept of equivalents thereof should be construed as being included in the scope of the present invention.

100, 100': wireless power transmitter and receiver 110, 110': wireless power transmitter
111: first CPU 112: first battery
113: charging port 114: wireless power transmitter
115: proximity sensor 120: wireless power receiver
121: second CPU 122: second battery
123: circuit unit 124: wireless power receiver

Claims (4)

Transmitting and receiving power using the wireless power transmitter 110' for transmitting power in a wireless charging method according to the Qi standard, which is a wireless charging method, and the wireless power receiver 120 for receiving power according to the Qi standard, A standby current reduction method for detecting whether the wireless power transmitter 110 and the wireless power receiver 120 are close to each other in order to reduce power consumed in a standby state for power transmission and reception,
When the first CPU 111 of the wireless power transmitter 110' is initialized, the wireless power transmitter 110' controls any kind of digital ping signal including a digital ping signal under the control of the first CPU 111. a first step of entering a standby mode in which power transmission is not performed;
a second step of continuously detecting whether the proximity sensor 115 included in the wireless power transmitter 110' is in proximity to the wireless power receiver 120 in the standby mode;
When the proximity sensor 115 detects the proximity of the wireless power receiver 120 and generates a proximity signal, the first CPU 111 controls the wireless power transmitter 110 ′ to enter a selection mode. a third step;
The first CPU 111 checks whether charging of the second battery 122 included in the wireless power receiver 120 is required, and the amount of power charged in the second battery 122 is less than or equal to a certain level. a fourth step of controlling the first CPU 111 to enter the ping response mode by the wireless power transmitter 110 ′;
a fifth step of controlling the first CPU 111 to enter the identification and setting mode by the first CPU 111 when the first CPU 111 receives a valid response in the ping response mode;
When authentication for the wireless power receiver 120 is completed in the identification and setting mode, the first CPU 111 controls the wireless power transmitter 110' to enter the power transmission mode, and the wireless power A sixth step of controlling to return to the standby mode after the proximity signal of the proximity sensor 115 is released after the first CPU 111 transmits a charge cancellation message when the authentication for the receiving device 120 fails Wow;
When the supply of power from the first battery 112 included in the wireless power transmitter 110 ′ to the second battery 122 of the wireless power receiver 120 is completed, the first CPU 111 is A seventh step of controlling the wireless power transmitter 110 ′ to enter a standby mode by sequentially passing through a ping response mode, an identification and setting mode, and a power transmission mode after passing the waiting time step; including, wireless power transmission and reception How to reduce the standby current of the device. According to claim 1,
The proximity sensor 115 is
a magnet sensor configured to check whether a magnetic field is in proximity by causing a change in a magnetic field according to the contact of a magnetic material or metal included in the wireless power receiver 120;
an ultrasonic sensor configured to detect an ultrasonic signal reflected from the contacting wireless power receiver 120 to confirm proximity;
an illuminance sensor configured to detect a change in illuminance that varies depending on the contact of the wireless power receiver 120 to confirm proximity;
a detachable sensor configured to mechanically generate a signal according to contact with the wireless power receiver 120 to confirm proximity; A method for reducing standby current of a wireless power transceiver device, characterized in that it consists of any one. delete delete

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