KR102069441B1 - Non-contact power transmission syatem with overheat protection and method thereof - Google Patents

Abstract

The present invention is to prevent damage due to overheating when charging the battery cell module, the contactless power transmission device to transfer the first power to the contactless power receiver through the power transmission coil to charge the battery cell module When the overheat alarm signal is received from the contactless power receiver, the contactless power transmitter transmits the second power lower than the first power to the contactless power receiver through the power transmission coil to charge the battery cell module. The present invention relates to a non-contact power transmission system and method having an overheat protection function capable of being fully charged while preventing overheating of a battery cell module.

Description

Non-contact power transmission syatem with overheat protection and method

The present invention relates to a non-contact power transmission system and method having an overheat protection function to prevent the battery cell module from being damaged due to overheating when charging power to the battery cell module.

Generally, portable terminals such as mobile phones and PDAs (Personal Digital Assistants) are equipped with battery packs. The battery pack charges power supplied from an external charging device and supplies the charged power to the portable terminal so that the portable terminal can be operated according to a user's operation.

The battery pack includes a battery cell module for charging power and a charge / discharge circuit for charging and discharging power in the battery cell module.

As a method of electrically connecting the battery pack provided in the portable terminal and the charging device for supplying electrical energy, there is a terminal connection method for directly connecting the terminals of the charging device and the terminals of the battery pack.

However, in the terminal connection method, when the terminals of the charging device and the terminals of the battery pack are contacted or separated from each other, instantaneous discharge occurs because the terminals of the battery pack and the terminals of the charging device have different potential differences. .

Such an instant discharge wears out the terminals of the battery pack and the terminals of the charging device, and there is a fear that a safety accident such as a fire occurs when foreign matters are accumulated on the terminals of the battery pack and the terminals of the charging device.

In addition, there is a problem that the electrical energy charged in the battery pack due to moisture or the like is naturally discharged to the outside through the terminal of the battery pack, thereby shortening the service life of the battery pack, resulting in deterioration of performance.

Recently, in order to solve various problems of the terminal connection method as described above, contactless power transmission systems using a method of transmitting power in a contactless state have been proposed.

In such a contactless power transmission system, a lot of efforts have been made to increase power transmission efficiency along with stable power transmission and power reception.

Korean Laid-Open Patent Publication 10-2007-0028896 ("Contactless Charging Device", LG Electronics, Inc., 2007. 03. 13)

Therefore, a problem to be solved by the present invention is a contactless power transmission system, a contactless power transmission system having an overheat protection function to protect the battery cell module from damage due to overheating when charging power to the battery cell module and To provide a way.

In addition, the problem to be solved by the present invention is that the contactless power transmission device transmits the first power to the contactless power receiving device to charge the battery cell module, the contactless power transmission when the battery cell module is overheated above the set temperature A contactless power transmission system having an overheat protection function for protecting the battery cell module from being damaged by overheating by transmitting a second power lower than the first power to the contactless power receiver to charge the battery cell module; To provide a way.

Problems to be solved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above may be clearly understood by those skilled in the art to which the present invention pertains. There will be.

According to the problem solving means of the present invention, in a state in which the contactless power receiver receives the first power transmitted by the contactless power transmitter to charge the battery cell module, the contactless power receiver is the battery cell module Determine if overheating occurs.

The determination of overheating may include detecting a first temperature of the battery cell module with a first temperature sensor, and determining that overheating occurs in the battery cell module when the detected first temperature is equal to or higher than a set temperature.

The determination of the overheating may include detecting a first temperature of the battery cell module with a first temperature sensor, detecting an external second temperature with a second temperature sensor, and presetting the first temperature rather than the second temperature. If the temperature is higher than or equal to, it may be determined that overheating occurs in the battery cell module.

When it is determined that the battery cell module is overheated, the contactless power receiver generates an overheat alarm signal and transmits it to the contactless power transmitter.

The contactless power transmission device charges the second power to the battery cell module by transmitting a second power lower than the first power to the contactless power reception device when an overheat alarm signal is received from the contactless power reception device. Do not overheat.

In addition, the contactless power receiver prevents the occurrence of an error by switching to the second power charging mode in which the charging device charges the second power to the battery cell module after generating the overheat alarm signal.

Therefore, an embodiment of a contactless power transmission device having an overheat protection function according to the present invention includes a power transmission unit including a power transmission coil for transmitting power to a contactless power reception device, and the contactless power reception device transmits. A first signal receiver for receiving an overheat alarm signal, and controlling the power transmitter to transmit first power to the contactless power receiver, and transmitting the power when the first signal receiver receives the overheat alarm signal And a contactless power transfer controller for controlling the means to transmit a second power lower than the first power.

The power transmitter includes a driving driver for generating a driving signal for transmitting the first power or the second power under the control of the contactless power transmission controller, and a series resonant converter for switching DC power according to the driving signal. And a power transmission coil which transmits the first power or the second power to the contactless power receiver while resonating with the power switched by the series resonant converter.

In addition, an embodiment of a contactless power transmission device having an overheat protection function of the present invention is a first signal transmission unit for generating an ID request signal under the control of the contactless power transmission control unit to transmit to the contactless power reception device. The first signal receiver further includes an ID signal transmitted from the contactless power receiver according to the ID request signal, and provides the received ID signal to the contactless power transmission controller.

And another embodiment of a contactless power transmission device having an overheat protection function of the present invention is a charging device for receiving the first power transmitted by the contactless power transmission device to charge the battery cell module, and generates an overheat alarm signal It is determined whether the second signal transmitter and the battery cell module are overheated and the second signal transmitter generates the overheat alarm signal when the overheat is determined. And a contactless power reception control unit configured to control transmission to a transmission device and control the charging device to receive a second power lower than the first power from the contactless power transmission device to charge the battery cell module.

In addition, another embodiment of the contactless power receiving device having an overheat protection function of the present invention further comprises a first temperature sensor for detecting a first temperature of the battery cell module, the contactless power receiving control unit is the first It is determined whether the battery cell module is overheated by the temperature.

In addition, another embodiment of the contactless power receiver having an overheat protection function of the present invention further comprises a second temperature sensor for detecting an external second temperature, the contactless power receiver is the second temperature and the If the difference in temperature is greater than a predetermined value, it is determined that the battery cell module is overheated.

In addition, another embodiment of a contactless power receiver having an overheat protection function of the present invention further comprises a second signal receiver for receiving an ID request signal transmitted by the contactless power transmission device to provide to the contactless power reception control unit The second signal transmitter generates an ID signal under the control of the contactless power receiver and transmits the ID signal to the contactless power transmitter when the ID request signal is received.

The charging device may include a power receiving coil receiving the first power or the second power transmitted by the contactless power transmission device, and the first power or the second power received by the power receiving coil as direct current power. And a charging unit configured to charge the battery cell module under the control of the contactless power receiver.

In a contactless power reception method having an overheat protection function of the present invention, the contactless power transmitter transmits first power to a contactless power receiver through a power transmission coil, and an overheat alarm from the contactless power receiver. And when the signal is received, transmitting the second power lower than the first power to the contactless power receiving device through the power transmitting coil.

The transmitting of the first power may include: transmitting, by the contactless power transmitter, an ID request signal to the contactless power receiver, and receiving an ID signal from the contactless power receiver according to the ID request signal. And in the case of transmitting the first power.

The transmitting of the ID request signal may include determining whether a load change occurs in the power transmission coil and transmitting the ID request signal when it is determined that a load change occurs in the power transmission coil. Include.

In addition, the contactless power transmission method having an overheat protection function of the present invention includes the step of stopping the transmission of the power by the contactless power transmission control unit when the charge completion signal is received from the contactless power receiver.

Another embodiment of the contactless power transmission method with an overheat protection function of the present invention comprises the steps of receiving the first power transmitted by the contactless power transmission device, the charging device to charge the battery cell module, the contactless power reception The controller determines whether the battery cell module is overheated, and when the battery cell module is overheated, the contactless power receiving controller transmits an overheat alarm signal to the contactless power transmitter and then charges the charging device. And receiving a second power lower than the first power and charging the battery cell module.

The determining of whether the battery cell module is overheated may include determining, by a first temperature sensor, a first temperature of the battery cell module and overheating the battery cell module when the first temperature is equal to or greater than a preset temperature. It includes a step.

The determining of whether the battery cell module is overheated may include: detecting, by the first temperature sensor, the first temperature of the battery cell module; detecting, by the second temperature sensor, an external second temperature; And determining that the battery cell module is overheated when a difference between a temperature and the first temperature is greater than a preset value.

In addition, another embodiment of the contactless power receiving method with an overheat protection function of the present invention comprises the steps of the contactless power receiving control unit determines whether the charge of the battery cell module is completed, the charge completion of the battery cell module Generating a charge completion signal and transmitting the generated signal to the contactless power transmission apparatus.

According to the contactless power transmission system and method having the overheat protection function of the present invention, the contactless power transmission device transmits the first power to the contactless power receiving device to charge the battery cell module in the state of charging power to the battery cell module The controller determines whether the battery is overheated, and when the overheat is determined, the contactless power transmitter transmits a second power lower than the first power to the contactless power receiver to charge the battery cell module with the second power. .

Therefore, when the battery cell module is charged with electric power, the battery cell module may be prevented from being overheated and damaged, and the battery cell module may be fully charged while the battery cell module is not damaged by overheating.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, which do not limit the present invention, and like reference numerals designate like elements in some drawings.
1 is a view showing the configuration of a preferred embodiment of a contactless power transmission system according to the present invention,
2 is a signal flow diagram showing an operation of an embodiment of a contactless power transmission control unit according to the method of the present invention, and
3 is a signal flow diagram illustrating an operation of an embodiment of a contactless power receiver according to the method of the present invention.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure more than necessary for the basic understanding of the present invention through the drawings.

1 is a view showing the configuration of a preferred embodiment of a contactless power transmission system with an overheat protection function of the present invention. As shown, the contactless power transmission system having the overheat protection function of the present invention may include a contactless power transmission device 100 and a contactless power reception device 200.

The contactless power transmission apparatus 100 and the contactless power reception apparatus 200 transmit power by using an electromagnetic induction method, and the contactless power transmission apparatus 100 is a contactless first power or the first power. The contactless power receiver 200 transmits a second power lower than 1 power, and receives the first power or the second power transmitted by the contactless power transmitter 100 to a contactless state, thereby receiving a battery cell. The module 250 is charged or supplies operating power to a load such as a portable terminal equipped with the contactless power receiver 200.

The contactless power transmission device 100 operates as a direct current power supplied by an AC / DC converter (not shown), and the AC / DC converter is provided separately from the contactless power transmission device 100. It may be, or may be provided integrally with the contactless power transmission apparatus 100.

The contactless power transmission apparatus 100 may include a contactless power transmission control unit 110, a power transmission unit, a first signal transmission unit 150, and a first signal reception unit 160.

The contactless power transmission control unit 110 recognizes the contactless power receiving apparatus 200, and controls the operation of transmitting the first power or the second power lower than the first power in a contactless manner. .

The power transmitter transmits the first power or the second power to the contactless power receiver 200 in a contactless manner under the control of the contactless power transfer controller 110. The resonant converter 130 and the power transmission coil 140 is included.

According to the control of the contactless power transfer control unit 110, the drive driver 120 drives a signal to detect a change in load, a drive signal to transmit first power to a contactless state, or a drive to transmit second power to a contactless state Generate a signal or the like.

The series resonant converter 130 switches DC power supplied from the AC / DC converter according to a driving signal generated by the driving driver 120.

The power transmission coil 140 of the power transmission unit generates a signal for detecting a change in load while resonating in series with the power switched by the series resonant converter 130, or contactless the first power or the second power. To send.

Here, although only one power transmission coil 140 is shown, two or more power transmission coils may be connected and used in parallel in implementing the present invention. In the case of using the plurality of power transmission coils, each of the plurality of power transmission coils includes a switch and a capacitor in series, and selectively switches the switch under the control of the contactless power transmission control unit 110 to perform the series Power switched by the resonant converter 130 may be selectively output to the plurality of power transmission coils.

The first signal transmitter 150 generates an ID (Identification) request signal and the like under the control of the contactless power transmission control unit 110, and outputs the generated ID request signal and the like to the power transmission coil 140 To be transmitted to the contactless power receiver 200.

The first signal receiver 160 receives a signal of varying the load of the power transmission coil 140, an ID signal transmitted from the contactless power receiver 200, an overheat alarm signal, a charge completion signal, and the like. The received load change signal, the ID signal, the overheat alarm signal, and the charge completion signal are provided to the contactless power transfer controller 110.

The contactless power receiver 200 may include a contactless power receiver 210, a charging device, a battery cell module 250, a second signal receiver 260, a first temperature sensor 270, and a second temperature sensor ( 280, a second signal transmitter 290, and the like.

The contactless power reception control unit 210 controls the transmission of the ID signal to the contactless power transmission apparatus 100 according to the ID request signal transmitted from the contactless power transmission apparatus 100, and the contactless power supply. Receiving the first power or the second power transmitted by the transmission device 100 controls the charging to the battery cell module 250, and generates an overheat alarm signal when the battery cell module 250 is overheated Controlling the transmission to the contactless power transmission apparatus 100.

The charging device receives the first power or the second power transmitted by the contactless power transmission device 100 and charges the battery cell module 250 under the control of the contactless power reception control unit 210. The power receiving coil 220, the rectifier 230 and the charging unit 240 is included.

The power receiving coil 220 is coupled to the power transmission coil 140 of the contactless power transmission apparatus 100 in an electromagnetic induction manner so that the first power or the second power transmitted by the contactless power transmission apparatus 100. Receive

The rectifier 230 rectifies the first power or the second power received by the power receiving coil 220 to convert the DC power into DC power.

The charging unit 240 charges the DC power rectified by the rectifying unit 230 to the battery cell module 250 under the control of the contactless power receiving control unit 210.

The second signal receiver 260 receives an ID request signal transmitted by the contactless power transmission apparatus 100 through the power receiver coil 220, and receives the received ID request signal, etc., from the contactless power receiver. It provides to the control unit 210.

The first temperature sensor 270 detects a first temperature of the battery cell module 250 and provides the detected first temperature to the contactless power reception controller 210.

The second temperature sensor 280 detects an external second temperature and provides the detected second temperature to the contactless power reception controller 210.

The second signal transmitter 290 generates an ID signal, an overheat alarm signal, a charge completion signal, and the like under the control of the contactless power reception control unit 210, and generates an ID signal, an overheat alarm signal, a charge completion signal, and the like. Is transmitted to the contactless power transmission apparatus 100 through the power receiving coil 220.

2 is a signal flow diagram illustrating an operation of an embodiment of the contactless power transmission control unit 110 of the contactless power transmission apparatus 100 according to the method of the present invention. Referring to FIG. 2, in order for the contactless power transmitter 100 to transmit power to the contactless power receiver 200, first, the power transmitted by the contactless power transmitter 100 is transmitted to the contactless power receiver 200. Should be judged whether or not That is, it should be determined whether the power receiving coil 220 of the contactless power receiving device 200 is located at the position of the power transmitting coil 140 provided in the contactless power transmitting device 100.

To this end, the contactless power transmission controller 110 of the contactless power transmission apparatus 100 controls the driving driver 120 to generate a driving signal for detecting a change in load (S100).

The driving signal generated by the driving driver 120 is input to the series resonant converter 130.

The series resonant converter 130 includes switching elements such as a plurality of transistors or a plurality of MOSFETs, and switches a DC power while selectively switching a plurality of switching elements according to a driving signal generated by the driving driver 120. AC power is generated, and the generated AC power is output to the power transmission coil 140 to generate a series resonance in the power transmission coil 140.

In this state, the first signal receiver 160 receives the signal of the power transmission coil 140 and outputs the received signal to the contactless power transmission controller 110.

The contactless power transmission control unit 110 inputs a signal of the first signal receiving unit 160 and determines whether a load variation occurs in the power transmission coil 140 using the input signal ( S102).

That is, the impedance change does not occur in the power transmission coil 220 when the power receiving coil 220 of the contactless power receiving device 200 is not close to the power transmission coil 140.

Then, the first signal receiver 160 receives only a signal having a frequency corresponding to the drive signal generated by the drive driver 120, and the contactless power transmission controller 110 of the first signal receiver 160 As a signal, it may be determined that a change in load does not occur in the power transmission coil 140.

And when the power receiving coil 220 of the contactless power receiving device 200 to the power transmission coil 140 to charge the battery pack module 240 of the contactless power receiving device 200, An impedance change occurs in the power transmission coil 140, and a frequency of a signal for detecting a change in a load applied to the power transmission coil 140 varies according to the generated impedance change.

Then, the first signal receiver 160 receives a signal having a frequency changed according to the impedance change, and the contactless power transmission controller 110 receives the power transmission coil as a signal of the first signal receiver 160. It is determined that a change in load has occurred at 140.

When it is determined in step S102 that there is no load change, the contactless power transfer controller 110 returns to step S100 and the drive driver 120 continues to detect the change in load. The control unit generates a driving signal for the control unit and repeatedly performs an operation of determining whether or not a load variation has occurred.

If it is determined in step S102 that a load variation occurs, the contactless power transmission control unit 110 controls the first signal transmission unit 150 to request an ID of the contactless power receiving apparatus 200. The request signal is generated and the generated ID request signal is transmitted to the contactless power receiver 200 through the power transmission coil 140 (S104).

The contactless power transmission control unit 110 inputs a signal of the first signal receiving unit 160 to determine whether an ID signal is received from the contactless power receiving device 200 (S106).

That is, there are various causes of impedance change in the power transmission coil 140. For example, the impedance change may occur when the power receiver coil 220 of the contactless power receiver 200 approaches the power transmitter coil 140 as described above, but the contactless power receiver Impedance change may occur even when other foreign matter is approached to the power transmission coil 140 in addition to the 200.

When the contactless power transmission apparatus 100 transmits power when impedance is generated by the foreign matter, much power is consumed without need.

Therefore, when the load change of the power transmission coil 140 is determined, the contactless power transmission control unit 110 transmits an ID request signal for requesting an ID to the contactless power receiver 200 and the ID request signal. When the ID signal is received from the contactless power receiver 200, the contactless power transmission controller 110 changes the impedance of the power transmission coil 140 by the contactless power receiver 200. I judge it.

When the ID signal is not received as a result of the determination in step S106, the contactless power transmission control unit 110 determines whether a preset time has elapsed (S108), and when the preset time has not elapsed Returning to step S106, the operation of determining whether an ID is received from the contactless power receiver 200 is repeatedly performed.

If the ID signal is not received from the contactless power receiver 200 even after the preset time elapses, the contactless power transfer control unit 110 returns to step S100 to detect a change in load. The operation is repeated from the operation of generating a driving signal.

When the ID signal is received before the preset time elapses, the contactless power transmission controller 110 transmits the power reception coil 220 of the contactless power reception device 200 to the power transmission coil 140. In operation S110, it is determined that the device is close, and the driving driver 120 is controlled to generate a driving signal for transmitting the first power.

According to a driving signal for transmitting the first power generated by the driving driver 120, switching elements of the series resonant converter 130 are switched to switch DC power, and the switched power is the power transmission coil 140. Is applied to the first power is transmitted from the power transmission coil 140 to the power receiving coil 220 of the contactless power receiver 200.

In this state, the contactless power transmission control unit 110 inputs a signal from the first signal receiving unit 160 to determine whether an overheat alarm signal is received from the contactless power receiving device 200 (S112). When the overheat alarm signal is not received, the contactless power transmission controller 110 determines whether a charging completion signal is received from the contactless power receiver 200 (S114).

When the charging completion signal is received from the contactless power receiver 200 as a result of the determination, the contactless power transfer controller 110 ends the power transmission operation.

When the overheat alarm signal is received before the charging completion signal is received from the contactless power receiving device 200, the contactless power transmission control unit 110 controls the driving driver 120 to lower the first power. 2 and generates a driving signal for transmitting power (S116).

Then, the switching elements of the series resonant converter 130 are switched according to the driving signal for transmitting the second power generated by the driving driver 120, and thus the power receiving coil in the power transmission coil 140. Second power is transmitted to 220.

In this state, the contactless power transmission control unit 110 inputs a signal from the first signal receiving unit 160 to determine whether a charging completion signal is received from the contactless power receiving device 200 (S118). .

When the charging completion signal is not received as a result of the determination, the contactless power transfer control unit 110 returns to step S116 to cause the driving driver 120 to continuously generate a driving signal for transmitting the second power. In this case, the operation of determining whether the charging completion signal is received from the contactless power receiving device 200 is repeated, and the power transmission operation is terminated when the charging completion signal is received.

3 is a signal flow diagram illustrating an operation of an embodiment of a contactless power reception control unit 210 according to the method of the present invention. Referring to FIG. 3, the contactless power reception controller 210 determines whether an ID request signal is received from the contactless power transmitter 100 (S200).

That is, the ID request signal transmitted from the contactless power transmission controller 110 of the contactless power transmission apparatus 100 by controlling the first signal transmitter 150 in step S104 is a power transmission coil 140. ) Is induced to the power receiving coil 220, the second signal receiving unit 260 receives the induced ID request signal to the contactless power receiving control unit 210 as the contactless power receiving control unit 210. The input signal received by the second signal receiver 260 determines whether an ID request signal is received.

When the ID request signal is received from the contactless power transmission apparatus 100, the contactless power reception control unit 210 controls the second signal transmission unit 290 to generate an ID signal, and generates the generated ID signal. The power receiving coil 220 transmits to the contactless power transmitter 100 (S202).

The ID signal transmitted by the contactless power receiver 200 is guided from the power receiver coil 220 to the power transmitter coil 140 as described above, and the ID signal guided to the power transmitter coil 140 is first generated. The signal reception unit 160 is received and input to the contactless power transmission control unit 110. The contactless power transmission control unit 110 receives the ID signal of the first signal reception unit 160 in step S106. It may be determined whether a signal is received.

In this state, the first power transmitted by the contactless power transmission apparatus 100 to the contactless state is induced to the power receiving coil 220, and the rectifying unit 230 rectifies the induced first power to charge the charging unit 240. The contactless power reception controller 210 monitors the charging unit 240 to determine whether the first power is received (S204).

When the first power is received from the contactless power transmission apparatus 100 as a result of the determination, the contactless power reception control unit 210 controls the charging unit 240 to receive the received first power from the battery cell module 250. To charge (S206).

In this state of charging the battery cell module 250 with the first power, the contactless power reception controller 210 determines whether the battery cell module 250 is overheated (S208).

Here, there are various methods for determining the overheating of the battery cell module 250.

For example, the contactless power reception control unit 210 detects the first temperature of the battery cell module 250 by using the first temperature sensor 270, and the detected first temperature of the battery cell module 250 is preset. It may be determined that overheating occurs when the temperature is higher than the set temperature. In this case, the second temperature sensor 280 may not be provided.

In addition, the contactless power receiving control unit 210 detects the first temperature of the battery cell module 250 with the first temperature sensor 270 and also the contactless power receiving device 200 with the second temperature sensor 280. Detects an external second temperature at which is positioned, and when the first temperature of the battery cell module 250 is higher than or equal to a preset temperature based on the detected second temperature, for example, the second temperature is higher than the second temperature. When the temperature is higher than 10 ° C., it may be determined that the battery cell module 250 is overheated.

When overheating does not occur in the battery cell module 250, the contactless power reception controller 210 monitors the charger 240 to determine whether charging of the battery cell module 250 is completed. (S210).

In this state, if the battery cell 250 is not overheated and it is determined that the charging is completed, the contactless power reception control unit 210 controls the second signal transmission unit 290 to provide a charging completion signal. The generated charge completion signal is transmitted to the contactless power transmission apparatus 100 through the power receiving coil 220 (S212).

As described above, the charging completion signal transmitted by the contactless power receiver 200 is guided to the power transmission coil 140 of the contactless power transmitter 100 and received by the first signal receiver 160. The contactless power transmission control unit 110 may receive a signal from the first signal receiving unit 160 to determine whether the charging completion signal is received in step S118.

In addition, when overheating of the battery cell module 250 is determined before the battery cell module 250 is fully charged, the contactless power receiving controller 210 controls the second signal transmitter 290 to overheat. The alarm signal is generated, and the generated overheat alarm signal is transmitted to the contactless power transmitter 100 through the power receiving coil 220 (S214).

The overheat alarm signal transmitted by the contactless power receiver 200 is guided to the power transmission coil 140 and received by the first signal receiver 160. As described above, the contactless power transmission controller 110 The input signal received by the first signal receiver 160 determines whether an overheat alarm signal is received in step S112, and when the overheat alarm signal is received, the driving driver 120 determines the first signal. The second power transmission is controlled by generating a driving signal for the second power transmission lower than the power.

In this state, the contactless power receiving control unit 210 switches the charging unit 240 to the second power charging mode to control the battery cell module 250 to charge the second power (S216).

That is, when a second power lower than the first power is input from the rectifier 230 while the charger 240 charges the first power to the battery cell module 250, the charger 240 generates an error. There is a possibility that it was judged.

Therefore, in the present invention, after the contactless power receiving control unit 210 generates an overheating alarm signal, the charging unit 240 is switched to the second power charging mode so as not to determine the occurrence of an error.

As described above, in the state of charging the battery cell module 250 with the second power, the contactless power receiving control unit 210 monitors the charging unit 240 to determine whether charging of the battery cell module 250 is completed. It is determined (S218).

When the charging is not completed as a result of the determination, the contactless power reception controller 210 repeatedly determines whether the charging is completed in the battery cell module 250.

When it is determined that the battery cell module 250 has been charged, the contactless power reception controller 210 controls the second signal transmitter 290 to generate a charge completion signal, and the generated charge completion signal is It transmits to the contactless power transmission apparatus 100 through the power receiving coil 220 (S220), and ends the charging operation.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

100: contactless power transmission device 110: contactless power transmission control unit
120: drive driver 130: series resonant converter
140: power transmission coil 150: first signal transmission unit
160: first signal receiver 200: contactless power receiver
210: contactless power receiving control 220: power receiving coil
230: rectifying part 240: charging part
250: battery cell module 260: second signal receiver
270: first temperature sensor 280: second temperature sensor
290: second signal transmission unit

Claims (8)

A power receiver for receiving power transmitted wirelessly from a power transmitter,
A power receiving coil receiving first power transmitted from the power transmission device;
A rectifier for rectifying the first power received by the power receiving coil;
After a change in impedance is generated in the power transmission coil of the power transmission device, when the first signal is received from the power transmission device, the control is performed to transmit a second signal to the power transmission device, and the first signal is received through the power reception coil. When the power is received, the controller controls the battery cell module to be charged using the first power, and determines whether the power receiver is overheated while receiving the first power, and when the overheat of the power receiver is detected, the power A controller configured to control an overheat alarm signal to be transmitted to a transmission device, and to receive a second power having a power level lower than the first power from the power transmission device through the power reception coil;
A first temperature sensor detecting a first temperature of the battery cell module; And
A second temperature sensor for detecting an external second temperature
Including,
If the overheating of the power receiver is detected, the control unit controls to receive the second power in a state in which it is switched to a mode different from a mode for receiving the first power,
The controller determines that the power receiver is overheated when the difference between the first temperature and the second temperature is greater than a preset value.
The preset value is 10 ° C, the power receiving device. The method of claim 1,
And the first power and the second power are delivered to the power receiving coil of the power receiving device through the power transmitting coil of the power transmitting device. The method of claim 1,
And the first signal is an ID request signal for requesting an ID of the power receiver. The method of claim 1,
And the second signal comprises an ID signal of the power receiver. In the power receiving method of the power receiving apparatus including at least one power receiving coil in a system for wirelessly charging power,
Generating a change in impedance in the power transmission coil of the power transmission device;
Transmitting a second signal to the power transmitter in response to the first signal when a first signal is received from the power transmitter;
Wirelessly receiving first power from the power transmission device through the power receiving coil;
Detecting, at a first temperature sensor, a first temperature of a battery cell module of the power receiving device;
Detecting, at a second temperature sensor, an external second temperature;
Determining whether the power receiver is overheated while receiving the first power, and if an overheat of the power receiver is detected, transmitting an overheat alarm signal to the power transmitter; And
Receiving a second power having a lower power level than the first power from the power transmission device through the power receiving coil in a state in which it is switched to a mode different from a mode for receiving the first power based on the overheat alarm signal. Steps to
Including,
Determining whether the power receiver is overheated includes determining that the power receiver is overheated when a difference between the first temperature and the second temperature is greater than or equal to a preset value.
The preset value is 10 ° C, the power receiving method. The method of claim 5,
And the first power and the second power are received by the power receiving coil through a power transmitting coil of the power transmitting device. The method of claim 5,
And the first signal is an ID request signal for requesting an ID of the power receiver. The method of claim 5,
The transmitting of the second signal may include transmitting an ID signal of the power receiver.

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