KR20140073420A - Method for protecting over temperature during charging and wireless power receiver therefor - Google Patents

Abstract

To achieve the stated part, a wireless power receiver according to the present invention includes a power receiving unit which receives AC type wireless power from a wireless power transmitter, a regulator unit which regulates the wireless power, a power managing unit which supplies the regulated wireless power to a battery and controls a charging operation, a temperature measuring unit which measures the temperature of one point of the wireless power receiver according to the reception of the wireless power, and a control unit which outputs a control signal to perform the charging operation with controlled charging power if the temperature measured by the temperature measuring unit exceeds a preset temperature.

Description

[0001] METHOD FOR PROTECTING OVER TEMPERATURE DURING CHARGING AND WIRELESS POWER RECEIVER THEREFOR [0002] BACKGROUND OF THE INVENTION [0003]

The present invention is directed to a method for preventing overtemperature of a wireless power receiver and to a wireless power receiver therefor.

BACKGROUND ART A mobile terminal such as a mobile phone or a PDA (Personal Digital Assistants) is driven by a rechargeable battery. In order to charge the battery, a separate charging device is used to supply electric energy to the battery of the mobile terminal. Typically, the charging device and the battery are each provided with a separate contact terminal on the outside thereof, thereby electrically connecting the charging device and the battery by making them contact each other.

However, in such a contact type charging method, since the contact terminal protrudes to the outside, contamination by foreign matter is easy and the battery charging is not properly performed. Also, even if the contact terminals are exposed to moisture, charging is not properly performed.

In order to solve these problems, wireless charging or non-contact charging technology has recently been developed and used in many electronic devices.

This wireless charging technique uses wireless power transmission and reception, for example, a system in which a battery can be automatically charged by simply placing a cellular phone on a charging pad without connecting a separate charging connector. It is generally known to the general public as a wireless electric toothbrush or a wireless electric shaver. Such wireless charging technology can enhance the waterproof function by charging the electronic products wirelessly, and it is advantageous to increase the portability of the electronic devices since the wired charger is not required, and the related technology is expected to greatly develop in the upcoming electric car era .

In a wireless power receiver, heat may be generated by rectifying or regulating the AC power in a DC form.

A conventional wireless power receiver monitors the temperature of the wireless power receiver and stops receiving the wireless power when the temperature is above a predetermined temperature. Accordingly, the wireless charging due to the temperature rise is interrupted, and the wireless charging must be resumed when the temperature is lowered. However, it is important that the wireless power receiver perform seamless charging during wireless charging. However, in the conventional wireless power receiver, if the over-temperature condition occurs and the wireless charging is interrupted, the charging can no longer be resumed until the temperature is lowered. Therefore, it is very inconvenient for the user to wait for the connection to be made again before the recharging of the previous charge is continued.

Thus, at least one embodiment of the present invention provides an apparatus and method for preventing excess temperature in a wireless power receiver such that charging can proceed seamlessly.

In addition, at least one embodiment of the present invention provides a method and a wireless power receiver therefor for preventing temperature increase by reducing the value of the current flowing inside the wireless power receiver when the temperature exceeds a predetermined temperature.

In order to accomplish the foregoing, a wireless power receiver for preventing excess temperature during charging according to an embodiment of the present invention includes: a power receiver for receiving AC power in the form of AC from a wireless power transmitter; a temperature measuring unit for measuring a temperature of one point of the wireless power receiver according to the wireless power reception; and a controller for controlling the temperature of the wireless power receiver, And a control unit for outputting a control signal to be charged with the adjusted charging power when the temperature measured by the temperature measuring unit exceeds a preset temperature.

In accordance with another aspect of the present invention, there is provided a method for preventing excess temperature during charging in a wireless power receiver, comprising the steps of: receiving wireless power from a wireless power transmitter; And controlling the battery to be charged with the adjusted charge power when the measured temperature exceeds a preset temperature.

According to at least one embodiment of the present invention, a wireless power receiver may be provided that, when exceeding a predetermined temperature, reduces the value of the current flowing inside the wireless power receiver to prevent temperature increase.

Figure 1 illustrates a wireless charging system.
2A is a block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.
2B is a block diagram of a wireless power receiver in accordance with an embodiment of the present invention.
Figures 3a and 3b are block diagrams of a wireless power receiver in accordance with various embodiments of the present invention.
4 is a block diagram of a wireless power receiver in accordance with an embodiment of the present invention.
5 and 6 are flowcharts illustrating a method of controlling a wireless power receiver according to various embodiments of the present invention.

The present invention can be variously modified and may have various embodiments, and specific embodiments will be described in detail with reference to the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

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

Figure 1 illustrates a wireless charging system. As shown in FIG. 1, the wireless charging system includes a wireless power transmitter 100 and at least one wireless power receiver 110-1, 110-2, 110-n.

The wireless power transmitter 100 may transmit power (1-1, 1-2, 1-n) wirelessly to each of the at least one wireless power receiver (110-1, 110-2, 110-n). The wireless power transmitter 100 may transmit power (1-1, 1-2, 1-n) wirelessly only to the authenticated wireless power receiver through a predetermined authentication procedure.

The wireless power transmitter 100 may form a wireless connection with at least one wireless power receiver 110-1, 110-2, 110-n. For example, the wireless power transmitter 100 may transmit wireless power via electromagnetic waves to at least one wireless power receiver 110-1, 110-2, 110-n.

Meanwhile, the wireless power transmitter 100 may perform bidirectional communication with the wireless power receivers 110-1, 110-2, and 110-n. Here, the wireless power transmitter 100 and the wireless power receivers 110-1, 110-2, and 110-n can process or transmit packets 2-1, 2-2, 2-n configured with a predetermined frame. The above-mentioned frame will be described later in more detail. The wireless power receiver may be implemented as a mobile communication terminal, a PDA, a PMP, a smart phone, or the like.

The wireless power transmitter 100 may provide power wirelessly to a plurality of wireless power receivers 110-1, 110-2, and 110-n. For example, the wireless power transmitter 100 may transmit power to a plurality of wireless power receivers 110-1, 110-2, and 110-n through a resonance method. If the wireless power transmitter 100 employs a resonant mode, the distance between the wireless power transmitter 100 and the plurality of wireless power receivers 110-1, 110-2, 1110-n may preferably be 30 m or less. Also, when the wireless power transmitter 100 employs an electromagnetic induction scheme, the distance between the power providing apparatus 100 and the plurality of wireless power receivers 110-1, 110-2, 110-n may preferably be 10 cm or less.

At least one of the wireless power receivers 110-1, 110-2, and 110-n may receive wireless power from the wireless power transmitter 100 to perform charging of the battery included therein. Also, at least one of the wireless power receivers 110-1, 110-2, and 110-n may include a signal requesting wireless power transmission, information required for wireless power reception, wireless power receivers 110-1, 110-2, 110- (2-1, 2-2, 2-n) including information for controlling the transmitter 100 (i.e., control information) to the wireless power transmitter 100. [ Information on the transmission signal will be described later in more detail.

Also, each of the at least one wireless power receiver 110-1, 110-2, 110-n may send a message to the wireless power transmitter 100 indicating a state of charge.

The wireless power transmitter 100 may include a display such as a display and may include at least one wireless power receiver 110-1,110-n based on a message received from each of the at least one wireless power receiver 110-1, -2, and 110-n, respectively. In addition, the wireless power transmitter 100 may display together the time that each wireless power receiver 110-1, 110-2, 110-n is expected to complete charging.

The wireless power transmitter 100 may transmit a control signal (or control message) that causes the wireless charging function to be disabled for each of the at least one wireless power receiver 110-1, 110-2, 110-n. The wireless power receiver that receives the disable control signal of the wireless charging function from the wireless power transmitter 100 may disable the wireless charging function.

2A is a block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.

2A, the wireless power transmitter 200 may include a power transmitter 211, a controller 212, and a communication unit 213. The wireless power receiver 250 may also include a power receiver 251, a controller 252, and a communication unit 253.

The power transmitter 211 may provide the power required by the wireless power transmitter 200 and may provide power to the wireless power receiver 250 wirelessly. Here, the power transmission unit 211 can supply power in the form of an AC waveform, and can convert power of the DC waveform into AC waveform using an inverter to supply power of the AC waveform. The power transmitter 211 may be implemented in the form of a built-in battery, or may be implemented in the form of a power receiving interface to receive power from the outside and supply it to other components. Those skilled in the art will readily understand that the power transmitter 211 is not limited as long as it can provide power of an AC waveform.

In addition, the power transmitter 211 may provide the AC waveform to the wireless power receiver 250 in the form of an electromagnetic wave. The power transmission unit 211 may further include a loop coil, thereby transmitting or receiving a predetermined electromagnetic wave. When the power transmission unit 211 is implemented as a loop coil, the inductance L of the loop coil may be changeable. Those skilled in the art will readily understand that the power transmission unit 211 is not limited as long as it can transmit and receive electromagnetic waves.

The control unit 212 may control the entire operation of the wireless power transmitter 200. [ The control unit 212 can control the overall operation of the wireless power transmitter 200 using an algorithm, a program, or an application required for the control read from the storage unit (not shown). The control unit 212 may be implemented in the form of a CPU, a microprocessor, or a mini computer. The detailed operation of the control unit 212 will be described later in more detail.

The communication unit 213 may communicate with the wireless power receiver 250 in a predetermined manner. The communication unit 213 communicates with the communication unit 253 of the wireless power receiver 250 through communication using an NFC (near field communication), a Zigbee communication, an infrared communication, a visible light communication, a Bluetooth communication method, a Bluetooth low energy method, Can be performed. The communication unit 213 according to an exemplary embodiment of the present invention may perform communication using a Zigbee communication scheme or a Bluetooth low-energy scheme of IEEE802.15.4 scheme. In addition, the communication unit 213 may use the CSMA / CA algorithm. The configuration related to the frequency and channel selection used by the communication unit 213 will be described later in more detail. Meanwhile, the above-described communication method is merely an example, and the scope of the present invention is not limited by the specific communication method performed by the communication unit 213. [

On the other hand, the communication unit 213 can transmit a signal for the information of the wireless power transmitter 200. [ Here, the communication unit 213 may unicast, multicast, or broadcast the signal.

Table 1 is a data structure of a signal transmitted from the wireless power transmitter 200 according to an embodiment of the present invention. The wireless power transmitter 200 may transmit a signal having the following frame every predetermined period, and the signal may be hereinafter referred to as a Notice signal.

frame type protocol version 시퀀스 번호 network ID RX to Report (schedule mask) Reserved Number of Rx Notice 4bit 1 Byte 1 byte 1 byte 5bit 3bit

The frame type in Table 1 indicates a signal type, and in Table 1 it indicates that the signal is a Notice signal. The protocol version field is a field for indicating the type of protocol of the communication method, for example, 4 bits can be allocated. The sequence number field is a field for indicating a sequential order of the corresponding signal, for example, 1 byte. The sequence number may be incremented by one, for example, in response to a signal transmission / reception step. The network ID field indicates a network ID of the wireless power transmitter 200, and may be, for example, 1 byte. The Rx to Report (Schedule Mask) field is a field that indicates radio power receivers to report to the radio power transmitter 200, for example, 1 byte. Table 2 is an Rx to Report (schedule mask) field according to an embodiment of the present invention.

Rx to Report (schedule mask) Rx1 Rx2 Rx3 Rx4 Rx5 Rx6 Rx7 Rx8 One 0 0 0 0 One One One

Here, Rx1 to Rx8 may correspond to the radio power receivers 1-8. The Rx to Report (schedule mask) field may be implemented such that a wireless power receiver with a schedule mask number of 1 performs the report.

The Reserved field is a field reserved for future use, and may be allocated, for example, 5 bytes. The Number of Rx field is a field for indicating the number of wireless power receivers around the wireless power transmitter 200, for example, 3 bits may be allocated.

On the other hand, the signal of the frame format shown in Table 1 can be implemented in a format allocated to the WPT among the data structure of IEEE802.15.4 format.

Table 3 shows the data structure of IEEE802.15.4.

Preamble SFD Frame Length WPT CRC16

As shown in Table 3, the data structure of IEEE802.15.4 may include Preamble, SFD, Frame Length, WPT, and CRC16 fields, and the data structure as shown in Table 1 may be included in the WPT field.

The communication unit 213 can receive the power information from the wireless power receiver 250. [ Here, the power information may include at least one of the capacity of the wireless power receiver 250, the remaining battery power, the number of times of charging, the amount of usage, the battery capacity, and the battery ratio. The communication unit 213 can also transmit a charging function control signal for controlling the charging function of the wireless power receiver 250. [ The charging function control signal may be a control signal that controls the wireless power receiving unit 251 of the specific wireless power receiver 250 to enable or disable the charging function.

The communication unit 213 may receive not only the wireless power receiver 250 but also signals from other wireless power transmitters (not shown). For example, the communication unit 213 can receive the Notice signal of the frame of Table 1 from another wireless power transmitter.

2A, although the power transmitting unit 211 and the communication unit 213 are configured with different hardware and the wireless power transmitter 200 is shown as being communicated in an out-band format, this is an example. The power transmitter 211 and the communication unit 213 may be implemented in one hardware so that the wireless power transmitter 200 may perform communication in an in-band format.

The wireless power transmitter 200 and the wireless power receiver 250 are capable of transmitting and receiving various signals such that the subscription of the wireless power receiver 250 to the wireless power network hosted by the wireless power transmitter 200, The above-described process will be described in more detail below.

2B is a block diagram of a wireless power receiver in accordance with an embodiment of the present invention.

2B, the wireless power receiver 250 includes a power receiving unit 251, a control unit 252, a communication unit 253, a rectifying unit 254, a DC / DC converter unit 255, a switch unit 256, And a charging unit 257. [

The description of the power receiving unit 251, the control unit 252, and the communication unit 253 will be omitted here. The rectifying unit 254 rectifies the received radio power to the power receiving unit 251 in a DC form, and may be implemented in the form of a bridge diode, for example. The DC / DC converter unit 255 can convert the rectified power to a predetermined gain. For example, the DC / DC converter unit 255 may convert the rectified power so that the voltage of the output terminal 259 is 5V. The minimum value and the maximum value of the voltage that can be applied to the front end 258 of the DC / DC converter unit 255 may be preset. The above information may be input to the input voltage MIN field and the input voltage MAX Field. In addition, the rated voltage value and the rated current value applied to the rear end 259 of the DC / DC converter 255 may be described in the Typical Output Voltage field and the Typical Output Current field of the request join signal.

The switch unit 256 may connect the DC / DC converter unit 255 and the charging unit 257. The switch unit 256 can maintain the on / off state under the control of the control unit 252. The charging unit 257 can store the converted power input from the DC / DC converter unit 255 when the switch unit 256 is in the ON state.

3A is a block diagram of a wireless power receiver in accordance with one embodiment of the present invention. The wireless power receiver of FIG. 3 may include a power receiving unit 310 and a terminal 320. The power receiving unit 310 also includes a receiving coil 311, a rectifier 312, a regulator 313, a temperature measuring unit 314 and a control unit 315. The terminal 320 includes a power management integrated circuit (PMIC) 321 and a battery 322. 3A illustrates a case where a charger IC and an MCU are integrated in the PMIC 321, but a charger IC may be separately implemented from the PMIC.

The receiving unit of the power receiving unit 310 serves to receive wireless power from a wireless power transmitter (not shown). In the embodiment of the present invention, the receiving unit is implemented as the receiving coil 311. The AC power output from the receiving coil 311 may be output to the rectifying unit 312.

The rectifying unit 312 can convert the input AC power into DC power. The regulator 313 can regulate and output the radio power converted into the DC form. This regulator 313 may be configured to include, for example, a DC-DC converter or the like, and may be configured to output a regulated current level. The input terminal of the regulator 313 is connected to the output terminal of the rectifier 312 and the output terminal of the regulator 313 is connected to the input terminal of the PMIC 321. 3A, the regulator 313 is supplied with a control signal for controlling the current level from the control unit 315. As shown in Fig. That is, the current output from the regulator 313 is adjusted in accordance with the control signal.

The temperature measuring unit 314 starts measuring the temperature in response to the power transmission from the wireless power receiver. At this time, the temperature measurement may be performed at a predetermined first period or non-periodically. The temperature measuring unit 314 can measure the temperature of one point of the wireless power receiver and includes a receiving coil 311, a rectifying unit 312, a regulator unit 313, a PMIC 321, a battery 322, The temperature of at least one of the devices can be measured.

On the other hand, the control unit 315 can control the overall operation of the power receiving unit 310. In addition, the controller 315 can manage the temperature information of each of the elements of the power receiving unit 310 input from the temperature measuring unit 314. With respect to adjusting the current level in this manner, the control unit 315 can adjust the level of the output current of the regulator 313 to a threshold value. The control unit 315 according to the embodiment of the present invention monitors the temperature at one point in the wireless power receiver using the temperature measuring unit 314, and when the temperature of the monitoring result exceeds a predetermined value, So as to be charged. The controller 315 may perform control to reduce at least one of the currents flowing through the regulator 313 and the PMIC 321 according to the embodiment of the present invention. The control unit 315 may output the control signal to the regulator 313 to adjust the charging power by reducing the output current from the regulator 313 to the PMIC 321. Alternatively, The charging current from the PMIC 321 to the battery 322 can be reduced.

The control unit 315 may output to the regulator 313 a control signal for reducing the output current of the regulator 313 when the temperature of the rectifying unit 312 exceeds a predetermined temperature. That is, it is possible to output a control signal for reducing the charge current of the PMIC 321 to the regulator 313. Here, the predetermined temperature is a temperature required to be monitored and set to be lower than the OTP (Over Temperature Protection) temperature corresponding to a charging abnormal state such as overheating.

Accordingly, the controller 315 determines whether the measured temperature in the temperature measuring unit 314 is equal to or higher than the predetermined temperature, and if the measured temperature is equal to or higher than the predetermined temperature, the temperature is overheated in accordance with the wireless charging in the wireless power receiver It is necessary to watch the state of charge.

For example, the control unit 315 may output to the regulator 313 a control signal for bringing the current level down to a current level of a predetermined level when the measured temperature is equal to or higher than the predetermined temperature. Alternatively, the controller may divide the pre-set temperature and the OTP temperature into a predetermined interval, and then output a control signal classified into a first-stage current level, a second-stage current level, It is possible. The control signal for controlling the temperature can be determined by referring to a predetermined table mapping the relationship between the measured temperature and the current to be adjusted. That is, the controller 315 can determine how much the temperature should be controlled by referring to the table. In addition, when the measured temperature is equal to or higher than the preset temperature, the temperature can be measured at a predetermined second cycle. At this time, the second period is shorter than the first period.

When the control signal for regulating the current level is outputted in such a manner that the output current from the regulator 313 is reduced, the output current delivered to the PMIC 321 is also reduced, and as a result, the temperature rise can be prevented. Thereafter, the control unit 315 monitors the temperature even after outputting the control signal for decreasing the output current, and outputs a control signal for increasing the regulated charging power when the measured temperature becomes the predetermined temperature or less . On the other hand, when the measured temperature exceeds the predetermined temperature, the controller outputs a control signal for decreasing the regulated charging power. At this time, if the temperature measurement result exceeds the predetermined temperature and the OTP temperature is exceeded, the wireless power receiver may be damaged due to overheating. Therefore, in order to prevent such damage, the control unit 315 can control to turn off the load switch .

The PMIC 321 can manage the power received wirelessly or the power received by wire and the power applied to each of the components of the wireless power receiver. Thus, the PMIC 321 can provide power to the battery 322 to charge the battery 322 to control charging.

3B is a block diagram of a wireless power receiver in accordance with another embodiment of the present invention. 3B, the control unit 315 can adjust the output current of the PMIC 321, as opposed to the control unit 315 adjusting the output current of the regulator 313 in the embodiment of FIG. 3A. For example, the control unit 315 can decrease the output current value of the PMIC 321 when the temperature exceeds the predetermined value as a result of the temperature measurement. In this way, the control unit 315 can reduce the charging current to the battery 322 by reducing the output current value of the PMIC 321, thereby preventing the temperature rise. In the embodiment of the present invention, the meaning of adjusting the output current to the battery 322 can also be interpreted to mean adjusting the output power. That is, when the battery 322 is a constant voltage type battery, the power changes as the current is regulated. Therefore, the adjustment of the output current and the output power can be interpreted in the same sense.

The control unit 315 may increase the output current value of the PMIC 321 again when the temperature falls below a predetermined value. In the above description, the output current or the charging current of the regulator 313 is reduced. However, the voltage may be reduced to a predetermined level.

4 is a block diagram of a wireless power receiver in accordance with an embodiment of the present invention. As shown in FIG. 4, the wireless power receiver may include a receive coil 410 and a terminal device 420. The terminal device 420 may include a rectifying section 421, a regulator section 422, a PMIC 423, a battery 424, a temperature measuring section 425, and a control section 426. 4, the terminal device may include a rectifying section 421, a regulator section 422, a temperature measuring section 425, and a control section 426. In this case, That is, the rectifying section 421, the regulator section 422, the temperature measuring section 425, and the control section 426 can be independently stored from the receiving coil 410. Here, the operations of the receiving coil 410, the rectifying section 421, the regulator section 422, the PMIC 423, the battery 424, and the temperature measuring section 425 are the same or extremely similar to the respective elements of FIG. 3B .

The PMIC 423 can convert the output voltage value of the regulated power into a voltage value used by another element of the terminal device 420 and output it. For example, if the voltage value of the regulated wireless power is 25V and the voltage value used by the battery 424 is 5V, the PMIC 423 converts the input voltage of 25V to 5V through DC / DC conversion Can be output.

The battery 424 may store the wireless power for which the voltage value is converted.

The temperature measuring unit 425 can measure the element temperature of the rectifying unit 421, the regulator unit 422, the PMIC 423, the battery 424, and the like, and can output the measurement result to the control unit 426.

The control unit 426 can control the overall operation of the terminal device 420. In particular, the control unit 426 may reduce the output power of the PMIC 423 based on the device temperature result. For example, the control unit 426 may reduce the output power of the PMIC 423 when the measured temperature exceeds a predetermined value. In addition, the controller 426 may increase the output power of the PMIC 423 again when the measured temperature falls below a preset value.

5 is a flowchart illustrating a method of controlling a wireless power receiver according to an embodiment of the present invention.

The wireless power receiver receives wireless power from the wireless power transmitter and may initiate wireless charging (510). A temperature gauge within the wireless power receiver may measure the temperature at one point of the wireless power receiver (520). The wireless power receiver monitors the result of the measured temperature. If the measured temperature is less than the preset value (530-Y), the wireless charging can be continued (540). On the other hand, if the measured temperature is equal to or higher than the preset value (530-N), the value of the charging current can be lowered (550). That is, the wireless power receiver may lower the current value of the charging power of at least one element included in the wireless power receiver.

The wireless power receiver may again measure if the measured temperature is less than a predetermined value (560). If the measured temperature is less than the preset value (560-Y), the wireless charging can continue. On the other hand, if the measured temperature is measured above a predetermined value (560-N), the wireless power receiver may again reduce the charging current (570). On the other hand, the wireless power receiver can again determine whether the measured temperature is less than a predetermined value, and if the measured temperature is less than the preset value (580-Y), the wireless charging can be continued. That is, the wireless power receiver according to the embodiment of FIG. 5 can step down the current value of the power applied to the wireless power receiver. At this time, if the measured temperature is higher than the predetermined value (580-N) in step 580, that is, if the temperature is measured again after a preset time, The wireless charging can be stopped in step 590.

6 is a flowchart illustrating a method of controlling a wireless power receiver according to an embodiment of the present invention.

The wireless power receiver receives wireless power from the wireless power transmitter and may initiate wireless charging (610). A temperature gauge within the wireless power receiver may measure the temperature at one point of the wireless power receiver (620). The wireless power receiver monitors the result of the measured temperature. If the measured temperature is less than the preset value (630-Y), the wireless charging can be continued (640). On the other hand, if the measured temperature is equal to or higher than the predetermined value (630-N), the charging current can be reset based on the temperature difference (DELTA temperature) (650). Here, the temperature difference may be a difference between the measured temperature and a predetermined value. The wireless power receiver can pre-store the information of the relationship between the temperature difference and the charging current to be reset. The wireless power receiver can read the relationship information when the measured temperature is less than a predetermined value, and reset the charge current based on the relationship information. That is, it can be reset to lower the charging current.

On the other hand, the wireless power receiver may again compare the measured temperature with a predetermined number (660). As a result of the comparison, if the measured temperature is less than the preset value (660-Y), the wireless charging can proceed to the reset current value (640). In other words, if it is confirmed that the measured temperature has dropped below a predetermined value as a result of the adjustment of the charging current, the charging current may be increased so that the measured charging temperature can be restored to the corresponding charging current before the measured temperature exceeds a predetermined value .

On the other hand, if the measured temperature is equal to or higher than the predetermined value (660-N), the charging current can be reset based on the relationship information (670). The wireless power receiver may again compare the measured temperature to a predetermined value (680). As a result of the comparison, if the measured temperature is less than the predetermined value (680-Y), the wireless charging can be proceeded to the reset current value (640). At this time, if the measured temperature is higher than the predetermined value (680-N) in step 680, that is, if the temperature is measured again after a predetermined time, The wireless charging is stopped in step 690. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It goes without saying that the example can be variously changed. Accordingly, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. * * * * * Recently Added Patents

Claims (15)

A wireless power receiver for overtemperature protection during charging,
A power receiver for receiving AC power in the form of AC from a wireless power transmitter,
A regulator unit for regulating the radio power;
A power management unit for providing the regulated wireless power as a battery to control charging;
A temperature measuring unit for measuring a temperature of one point of the wireless power receiver according to the wireless power reception;
And a controller for outputting a control signal to be charged with the regulated charging power when the temperature measured by the temperature measuring unit exceeds a preset temperature.
The method according to claim 1,
Wherein the temperature is set lower than the OTP (Over Temperature Protection) temperature.
The control method according to claim 1, wherein the control unit controls the charging power by outputting the control signal to the regulator and reducing an output current from the regulator to the power management unit Wireless power receiver.
The method according to claim 1,
A rectifier connected to the power receiving unit for rectifying the received radio power of the AC type in a DC form and delivering the received radio power to the regulator;
And the battery is charged with the radio power provided through the power management unit.
5. The apparatus of claim 4,
And outputting the control signal to the power management unit to reduce a charging current from the power management unit to the battery.
The apparatus according to claim 4,
Wherein the temperature of at least one of the power receiver, the regulator, the rectifier, and the battery is measured.
The apparatus of claim 1,
Outputting a control signal so that the temperature measured by the temperature measuring unit exceeds the preset temperature to be charged with the adjusted charging power and then comparing the temperature measured by the temperature measuring unit with the predetermined temperature Wherein the first and second power amplifiers are connected in series.
8. The apparatus of claim 7,
Wherein the controller outputs a control signal for increasing the regulated charging power when the measured temperature is equal to or lower than the preset temperature as a result of the comparison operation.
8. The apparatus of claim 7,
And outputs a control signal for decreasing the regulated charging power when the measured temperature exceeds the preset temperature as a result of the comparison operation.
A method for overtemperature protection during charging in a wireless power receiver,
Receiving wireless power from a wireless power transmitter;
Measuring a temperature according to the wireless power reception;
And controlling the battery to be charged with the regulated charging power when the measured temperature exceeds a preset temperature.
11. The method according to claim 10,
Wherein the temperature is set lower than an OTP (Over Temperature Protection) temperature.
11. The method of claim 10,
And reducing the charge current to the battery. ≪ Desc / Clms Page number 17 >
11. The method of claim 10,
Comparing the measured temperature with the predetermined temperature after controlling the battery to be charged with the adjusted charge power,
Further comprising the step of decreasing the regulated charging power if the measured temperature exceeds the preset temperature. ≪ Desc / Clms Page number 19 >
14. The method of claim 13,
Further comprising the step of increasing the regulated charging power when the measured temperature is less than or equal to the preset temperature.
The method as claimed in claim 10, wherein the step of controlling to charge with the regulated charging power comprises:
And outputting a control signal for reducing the output to either the regulator for regulating the wireless power or the power management unit for controlling the charging by providing the wireless power regulated by the regulator as a battery Gt; to < / RTI > prevent excessive temperature during charging.

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