KR101897634B1 - Wireless power transmitter, wireless power receiver and method for controlling each thereof - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a method of controlling a wireless power receiver that receives charging power from a wireless power transmitter and performs wireless charging. A control method according to an embodiment of the present invention includes the steps of receiving the charging power from the wireless power transmitter, detecting a change of the wireless charging environment, generating a message informing of the change of the wireless charging environment, And transmitting to the wireless power transmitter a message informing of the change of the wireless charging environment.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmitter, a wireless power receiver, and a control method therefor. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless power transmitter, a wireless power receiver, and a control method thereof, and more particularly, to a wireless power transmitter capable of wirelessly transmitting and receiving a charging power, a wireless power receiver and each control method.

In recent years, wireless charging or solid state charging technology has been developed and used in many electronic devices in recent years. The wireless charging technology utilizes wireless power transmission and reception. For example, it is a system in which a battery can be charged automatically by simply placing it on a charging pad without connecting a separate charging connector to the mobile phone. Wireless charging technology can enhance the waterproof function by wirelessly charging the electronic products, and it is possible to enhance the portability of electronic devices since no wired charger is required.

Among them, the charging using the resonance method is performed as follows. When a wireless power receiver (e.g., a mobile terminal) requiring charging is located in a wireless power transmitter (e.g., a charging pad) that transmits wireless power, the wireless power transmitter can charge the wireless power receiver. If a plurality of wireless power receivers are placed in the charging area of one wireless power transmitter, the power required for each wireless power receiver may be different from the power to be transmitted, so that charging for each wireless power receiver must be performed efficiently.

Research on wireless charging methods has been actively carried out in recent years, and the wireless charging order, search of wireless power transmitter / receiver, communication frequency selection between wireless power transmitter / receiver, wireless power adjustment, selection of matching circuit , Communication time distribution for each wireless power receiver in one charging cycle, and the like have not been proposed. In particular, when a change in the charging environment is detected in a wireless power receiver, development of a technology capable of informing the wireless power transmitter of the detected environmental change is required.

According to an aspect of the present invention, there is provided a method of controlling a wireless power receiver that receives a charging power from a wireless power transmitter and performs wireless charging, the method comprising: receiving the charging power from the wireless power transmitter; Detecting a change in the wireless charging environment; generating a message indicating a change in the wireless charging environment; and transmitting a message to the wireless power transmitter indicating a change in the wireless charging environment .

According to another aspect of the present invention, there is provided a method of controlling a wireless power transmitter that transmits a charging power to a wireless power receiver to perform wireless charging, the method comprising: transmitting the charging power to the wireless power receiver; Receiving a message including a request to maintain the output power during a mode switching time from the receiver; and maintaining output power to the wireless power receiver during the mode switching time included in the message. do.

According to various embodiments of the present invention, when a change in the charging environment is detected, a wireless power receiver capable of notifying it to the wireless power transmitter and a control method thereof can be provided. In addition, a wireless power transmitter and a method of controlling the same may be provided, which receive a signal from the wireless power receiver regarding a change detection of the charging environment.

In addition, when the charging environment is changed, such as when the wireless power receiver switches from stand alone mode to NSA (non-stand alone) mode, the wireless power transmitter transmits a mode switching condition . Accordingly, the wireless power transmitter can wait for a predetermined time until the mode switching is completed without ending the connection with the wireless power receiver even if the wireless power receiver does not receive the signal for a predetermined time.

Figure 1 illustrates a wireless charging system.
2 illustrates a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.
3 is a detailed block diagram of a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.
4 is a flowchart illustrating an operation of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.
5 is a flowchart illustrating operations of a wireless power transmitter and a wireless power receiver according to another embodiment of the present invention.
6 is a graph of the time axis of the amount of power applied by the wireless power transmitter.
7 is a flowchart illustrating a method of controlling a wireless power transmitter according to an embodiment of the present invention.
8 is a graph illustrating a time axis of the amount of power applied by the wireless power transmitter according to the embodiment of FIG.
9 is a flowchart illustrating a method of controlling a wireless power transmitter according to an embodiment of the present invention.
FIG. 10 is a graph illustrating a time axis of the amount of power applied by the wireless power transmitter according to the embodiment of FIG.
11 is a block diagram of a wireless power transmitter and a wireless power receiver in an SA mode according to an embodiment of the present invention.
12 is a block diagram of a wireless power transmitter and a wireless power receiver in a NAS mode according to an embodiment of the present invention.
13 is a flowchart illustrating operations of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.
FIG. 14 is a flowchart illustrating a method of controlling a wireless power receiver according to mode switching according to an exemplary embodiment of the present invention. Referring to FIG.
15 is a flowchart illustrating a method of controlling a wireless power transmitter according to mode switching according to one embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. It is to be noted that the same components in the drawings are denoted by the same reference numerals whenever possible. In the following description and drawings, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unnecessarily obscure.

At least one embodiment of the present invention provides for wireless power transmission control using non-contact short range wireless communication between a wireless power transmitter that provides wireless power and a wireless power receiver that receives the wireless power to perform charging, In a dead battery state, which can not supply enough power to turn on an application processor (AP), wireless charging can be performed using only some components for wireless charging arranged inside the wireless power receiver . For example, wireless charging can be performed using a contactless short-range wireless communication module built in a wireless power receiver without a separate communication module for wireless charging. Thereafter, when the AP is activated as the battery is charged, the communication stack can be loaded from the AP to perform wireless charging. At this time, it takes a certain time until the mode switching is completed as the AP is driven.

In an embodiment of the present invention, this mode switching is informed to the wireless power transmitter so that the wireless power transmitter can wait for the time required until the mode switching is completed. By doing so, even if a response is not received from the wireless power receiver for a predetermined time as the mode switching is performed, the wireless power transmitter can recognize the mode switching state in the wireless power receiver and maintain the connection with the wireless power receiver.

In the embodiment of the present invention, a Bluetooth (BT) or a Bluetooth low energy (BLE) scheme is used as a low-power wireless communication scheme among non-contact short-range wireless communication schemes. In the embodiment of the present invention, other low-power wireless communication schemes that consume the minimum power may use other short-range wireless communication schemes such as Zeegbe communication, wireless IrDA, etc. in addition to the above schemes. Also, according to the embodiment of the present invention, the non-contact short-range wireless communication unit can be constituted of a source chip capable of supporting a wireless network scheme as well as a low-power wireless communication scheme. Therefore, in the embodiment of the present invention, a WiFi scheme is used as a wireless network scheme.

Also, the wireless charging method according to an embodiment of the present invention may be applied to any device that performs charging by receiving wireless power such as wireless charging of electronic devices, wireless power supply of electric vehicles, remote wireless power supply, ubiquitous wireless sensor power supply . According to an embodiment of the present invention, wireless charging is performed using a contactless short-range wireless communication module built in a wireless power receiver without a separate communication module for wireless charging, There is an advantage that the manufacturing cost can be lowered.

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.

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. The at least one wireless power receiver 110-1, 110-2, 110-n may also include a request for wireless power transmission, information needed for wireless power reception, a wireless power receiver 110-1, 110-2, (2-1, 2-2, 2-n) to the wireless power transmitter 100, including the status information of the wireless power transmitter 100, have. Similarly, the wireless power transmitter 100 transmits a message including its status information, information for controlling the wireless power receivers 110-1, 110-2, 110-n (i.e., control information) To the receivers 110-1, 110-2, and 110-n.

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.

 2 illustrates a wireless power transmitter and a wireless power receiver in accordance with an embodiment of the present invention.

2, the wireless power transmitter 200 may include a power transmission unit 211, a control unit 212, a communication unit 213, a display unit 214, and a storage unit 215. 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.

The control unit 212 may control the entire operation of the wireless power transmitter 200. [ The control unit 212 can control the entire operation of the wireless power transmitter 200 using an algorithm, a program, or an application required for the control read from the storage unit 215. The control unit 212 may be implemented in the form of a CPU, a microprocessor, or a mini computer.

The communication unit 213 may communicate with the wireless power receiver 250 in a predetermined manner. 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 power receiving unit 251 of the specific wireless power receiver 250 to enable or disable the charging function. As will be described in more detail below, the power information may include information such as incoming of a wired charging terminal, switching from the SA mode to the NSA mode, and releasing an error situation.

The communication unit 213 may receive not only the wireless power receiver 250 but also signals from other wireless power transmitters (not shown).

The control unit 212 may display the state of the wireless power receiver 250 on the display unit 214 based on a message received from the wireless power receiver 250 through the communication unit 213. [ In addition, the controller 212 may display on the display unit 214 the expected time until the wireless power receiver 250 completes charging.

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

3, the wireless power transmitter 200 includes a power transmitter 211, a controller and communication units 212 and 213 (MCU & Out-of-band Signaling), a power supply 217, A power amplifier 218 and a matching circuit 216. [ The wireless power receiver 250 includes a power receiving unit 251, a control unit and communication units 252 and 253, a rectifier 254, a DC / DC converter unit 255, a switch unit 256, (Client Device Load) 257.

The driving unit 217 can output DC power having a preset voltage value. The voltage value of the DC power output from the driving unit 217 can be controlled by the control unit and the communication units 212 and 213.

The direct current output from the driving unit 217 can be output to the amplification unit 218. The amplifying unit 218 can amplify the direct current with a predetermined gain. Further, the DC power can be converted into an AC based on a signal input from the control unit and the communication units 212 and 213. [ Accordingly, the amplifying unit 218 can output AC power.

The matching unit 216 may perform impedance matching. For example, the impedance viewed from the matching unit 216 can be adjusted so that the output power can be controlled to be high efficiency or high output. The matching unit 216 can adjust the impedance based on the control of the control unit and the communication units 212 and 213. [ The matching unit 216 may include at least one of a coil and a capacitor. The control unit and the communication units 212 and 213 can control the connection state of at least one of the coils and the capacitors, thereby performing the impedance matching.

The power transmitting section 211 can transmit the inputted AC power to the power receiving section 251. The power transmission unit 211 and the power reception unit 251 may be implemented by a resonance circuit having the same resonance frequency. For example, the resonant frequency can be determined to be 6.78 MHz.

The control unit and the communication units 212 and 213 may communicate with the control unit and the communication units 252 and 253 on the side of the wireless power receiver 250 and may communicate with each other via a communication system such as WiFi, ZigBee, BT / ) Can be performed.

On the other hand, the power receiving unit 251 can receive the charging power.

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. On the other hand, 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 can be preset.

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

4 is a flowchart illustrating an operation of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention. As shown in FIG. 4, the wireless power transmitter 400 may apply power (S401). When power is applied, the wireless power transmitter 400 may configure the environment (S402).

The wireless power transmitter 400 may enter a power save mode (S403). In the power saving mode, the wireless power transmitter 400 can apply each of the different types of power beacons for different detection in each cycle, which will be described in more detail in Fig. For example, as shown in FIG. 4, the wireless power transmitter 400 may apply a power beacon 404, 405 for detection, and the magnitude of the power value of each of the power beacons 404, May be different. Some or all of the power beacons 404 and 405 for detection may have an amount of power capable of driving the communication unit of the wireless power receiver 450. [ For example, the wireless power receiver 450 may communicate with the wireless power transmitter 400 by driving the communication unit by some or all of the power beacons 404, 405 for detection. At this time, the state may be referred to as a null state.

The wireless power transmitter 400 may detect a load change due to the placement of the wireless power receiver 450. [ The wireless power transmitter 400 may enter the low power mode S408. The low power mode will be described in more detail with reference to FIG. Meanwhile, the wireless power receiver 450 can drive the communication unit based on the power received from the wireless power transmitter 400 (S409).

The wireless power receiver 450 may transmit a wireless power transmitter search (PTU searching) signal to the wireless power transmitter 400 (S410). The wireless power receiver 450 may transmit a wireless power transmitter search signal as a BLE-based Advertisement signal. The wireless power receiver 450 may periodically transmit a wireless power transmitter search signal and may receive a response signal from the wireless power transmitter 400 or transmit it until a predetermined time has elapsed.

When a wireless power transmitter search signal is received from the wireless power receiver 450, the wireless power transmitter 400 may transmit a response signal (PRU Respnse) signal (S411). Where the response signal may form a connection between the wireless power transmitter 400 and the wireless power receiver 400. [

The wireless power receiver 450 may transmit a PRU static signal (S412). Here, the PRU static signal may be a signal indicating the state of the wireless power receiver 450 and may request a subscription to the wireless power network controlled by the wireless power transmitter 400.

The wireless power transmitter 400 may transmit the PTU static signal (S413). The PTU static signal transmitted by the wireless power transmitter 400 may be a signal indicating the capability of the wireless power transmitter 400.

When the wireless power transmitter 400 and the wireless power receiver 450 transmit and receive the PRU static signal and the PTU static signal, the wireless power receiver 450 may periodically transmit the PRU dynamic signal (S414, S415) . The PRU dynamic signal may include at least one parameter information measured at the wireless power receiver 450. [ For example, the PRU dynamic signal may include voltage information at the rear end of the rectifier of the wireless power receiver 450. [ The state of the wireless power receiver 450 may be referred to as a boot state S407.

The wireless power transmitter 400 enters a power transmission mode S416 and the wireless power transmitter 400 can transmit a PRU control signal that is a command signal to cause the wireless power receiver 450 to perform charging (S417). In the power transmission mode, the wireless power transmitter 400 may transmit the charging power.

The PRU control signal transmitted by the wireless power transmitter 400 may include information enabling and disabling charging of the wireless power receiver 450 and permission information. The PRU control signal can be transmitted whenever the state of charge is changed. The PRU control signal may be transmitted, for example, every 250 ms, or may be transmitted when there is a parameter change. The PRU control signal may be set to be transmitted within a predetermined threshold time, for example, one second, even if the parameter is not changed.

The wireless power receiver 400 may transmit a wireless power receiver dynamic (PRU Dynamic) signal to change settings according to the PRU control signal and to report the status of the wireless power receiver 450 (S418, S419 ). The PRU dynamic signal transmitted by the wireless power receiver 450 may include at least one of voltage, current, wireless power receiver status, and temperature information. The state of the wireless power receiver 450 may be referred to as an On state.

On the other hand, the PRU dynamic signal can have the data structure as shown in Table 1.

As shown in Table 1, the PRU dynamic signal may be composed of at least one field. Each field includes optional field information, voltage information at the rear end of the rectifying section of the radio power receiver, current information at the rear end of the rectifying section of the radio power receiver, voltage information at the rear end of the DC / DC converter of the radio power receiver, (VRECT_MIN_DYN) of the rear end of the rectifying section of the wireless power receiver, the optimum voltage value information (VRECT_SET_DYN) of the rear end of the rectifying section of the wireless power receiver, Maximum voltage value information (VRECT_HIGH_DYN) and warning information (PRU alert) may be set. The PRU dynamic signal may include at least one of the above fields.

For example, at least one voltage setting value (e.g., minimum voltage value information (VRECT_MIN_DYN) at the rear end of the rectifying section of the wireless power receiver, optimum voltage value information (VRECT_SET_DYN) at the rear end of the rectifying section of the wireless power receiver) , Maximum voltage value information (VRECT_HIGH_DYN) at the rear end of the rectifying section of the wireless power receiver, etc.) in the corresponding field of the PRU dynamic signal. Thus, the wireless power transmitter receiving the PRU dynamic signal can adjust the wireless charging voltage to be transmitted to each wireless power receiver by referring to the voltage setting values included in the PRU dynamic signal.

Among them, the warning information (PRU Alert) can be formed with the data structure as shown in Table 2 below.

Referring to Table 2, the alert information (PRU Alert) includes a bit for a restart request, a bit for transition, and a bit for detecting a TA (Travel Adapter) . ≪ / RTI > The TA detect indicates a bit indicating that a terminal for wire charging is connected in a wireless power transmitter in which the wireless power receiver provides wireless charging. The bit for switching is a bit that informs the wireless power transmitter that the wireless power receiver's communication circuit (Integrated Circit) is reset before it switches from stand alone mode to NSA (non stand alone) mode. . Finally, a restart request may be initiated when the wireless power transmitter has lost power due to overcurrent or overtemperature conditions, and then returns to a normal state. If the wireless power transmitter is ready to recharge the wireless power receiver ≪ / RTI >

The warning information (PRU Alert) may also be formed with a data structure as shown in Table 3 below.

Referring to Table 3, the warning information may include at least one of over voltage, over current, over temperature, wireless power receiver self protection, charge complete, Wired Charger Detect, Mode Transition, and the like. Here, if '1' is set in the overvoltage field, this may indicate that the voltage Vrect at the wireless power receiver has exceeded the overvoltage limit. In addition, over current and over temperature can be set in the same manner as in overvoltage. In addition, the wireless power receiver self protection (PRU Self Protection) means that the wireless power receiver protects by reducing the power on the direct load, in which case the wireless power transmitter does not need to change the charging state.

The bits for mode transition according to the embodiment of the present invention may be set to a value for informing the wireless power transmitter of a period during which the mode switching procedure is performed. The bit indicating the mode switching period can be expressed as shown in Table 4 below.

'00' indicates no mode change, '01' indicates that the time required to complete the mode change is at most 2 seconds, '10' indicates that the mode change is requested &Quot; 11 " may indicate that the time required to complete the mode change is at most 6 seconds.

For example, if it takes 3 seconds or less to complete the mode change, the mode change bit may be set to '10'. Prior to the start of this mode switching procedure, the wireless power receiver may change the input impedance setting to fit a 1.1 W power draw to limit any impedance changes during the mode switching procedure. Thus, the wireless power transmitter adjusts the power (ITX_COIL) for the wireless power receiver to match this setting, thereby maintaining the power (ITX_COIL) for the wireless power receiver during the mode transition period.

Thus, if the mode transition period is set by the mode switching bit, the wireless power transmitter can maintain the power (ITX_COIL) for the wireless power receiver during its mode switching time, e.g., 3 seconds. That is, the connection can be maintained even if no response is received from the wireless power receiver for three seconds. However, after the mode switching time has elapsed, the power transmission can be terminated by considering the wireless power receiver as a rouge object.

Meanwhile, the wireless power receiver 450 may sense an error occurrence. The wireless power receiver 450 may send an alert signal to the wireless power transmitter 400 (S420). The warning signal can be transmitted as a PRU Dynamic (PRU Dynamic) signal or as an alert signal. For example, the wireless power receiver 450 may transmit an error condition to the wireless power transmitter 400 in the PRU alert field of Table 1. Or the wireless power receiver 450 may send a single warning signal to the wireless power transmitter 400 indicating an error condition. When the wireless power transmitter 400 receives the warning signal, it may enter the Latch Fault mode (S422). The wireless power receiver 450 may enter a null state (S423).

5 is a flowchart illustrating operations of a wireless power transmitter and a wireless power receiver according to another embodiment of the present invention. The control method of FIG. 5 will be described in more detail with reference to FIG. FIG. 6 is a time-axis graph of the amount of power applied by the wireless power transmitter according to the embodiment of FIG.

As shown in FIG. 5, the wireless power transmitter can start driving (S501). In addition, the wireless power transmitter may reset the initial setting (S503). The wireless power transmitter may enter a power saving mode (S505). Here, the power saving mode may be a period in which the wireless power transmitter applies different kinds of power having different amounts of power to the power transmission unit. For example, the wireless power transmitter may be a section that applies the second detected power 601, 602 and the third detected power 611, 612, 613, 614, 615 in FIG. 6 to the power transmitter. Here, the wireless power transmitter may periodically apply the second detected powers 601 and 602 in a second period, and may apply during a second period when the second detected powers 601 and 602 are applied. The wireless power transmitter may periodically apply the third detected power 611, 612, 613, 614, and 615 in the third period, and when the third detected power 611, 612, 613, 614, And may be authorized during the third period. On the other hand, although the respective power values of the third detected powers 611, 612, 613, 614 and 615 are shown as being different, the power values of the respective third detected powers 611, 612, 613, 614 and 615 May be different or may be the same.

The wireless power transmitter can output the third detected power 612 having the same amount of power after outputting the third detected power 611. [ When the wireless power transmitter outputs the third detected power of the same size as described above, the amount of power of the third detected power has the amount of power capable of detecting the smallest wireless power receiver, for example, the category 1 wireless power receiver .

On the other hand, the wireless power transmitter can output the third detection power 612 having a different amount of power after outputting the third detection power 611. [ When the wireless power transmitter outputs a third detected power of different magnitudes as described above, each of the powers of the third detected powers may be an amount of power capable of detecting the wireless power receivers of the categories 1 to 5. For example, the third detected power 611 may have an amount of power capable of detecting a category 5 wireless power receiver, and the third detected power 612 may have an amount of power capable of detecting a category 3 wireless power receiver And the third detected power 613 may have an amount of power capable of detecting the category 1 wireless power receiver.

On the other hand, the second detected powers 601 and 602 may be power capable of driving the wireless power receiver. More specifically, the second detected powers 601 and 602 may have an amount of power capable of driving the control unit and the communication unit of the wireless power receiver.

The wireless power transmitter may apply the second detected power 601 and 602 and the third detected power 611, 612, 613, 614, and 615 to the power receiving unit in the second period and the third period, respectively. When a wireless power receiver is placed on a wireless power transmitter, the impedance seen at one point of the wireless power transmitter may change. The wireless power transmitter can detect an impedance change while the second detected power 601, 602 and the third detected power 611, 612, 613, 614, 615 are applied. For example, the wireless power transmitter may detect that the impedance changes while applying the third detected power 615. [ Accordingly, the wireless power transmitter can detect an object (S507). If no object is detected (S507-N), the wireless power transmitter can maintain a power saving mode in which different types of power are periodically applied (S505).

On the other hand, if the impedance is changed and an object is detected (S507-Y), the wireless power transmitter can enter the low power mode. Here, the low power mode is a mode in which the wireless power transmitter applies driving power having an amount of power capable of driving the control section and the communication section of the wireless power receiver. For example, in FIG. 6, a wireless power transmitter may apply a driving power 620 to a power transmitter. The wireless power receiver may receive the driving power 620 to drive the control unit and the communication unit. The wireless power receiver may communicate based on the driving power 620 based on a predetermined scheme with the wireless power transmitter. For example, a wireless power receiver may send and receive data required for authentication, and may subscribe to a wireless power network governed by the wireless power transmitter based thereon. However, when a foreign substance other than the wireless power receiver is disposed, data transmission / reception can not be performed. Accordingly, the wireless power transmitter can determine whether the disposed object is foreign (S511). For example, if the wireless power transmitter fails to receive a response from an object for a preset time, the object may be determined to be foreign.

If determined to be a foreign object (S511-Y), the wireless power transmitter may enter a latch fault mode (S513). On the other hand, if it is determined that the object is not a foreign object (S511-N), the joining step can proceed (S519). For example, the wireless power transmitter may periodically apply the first power (631 to 634) in Fig. 6 in a first period. The wireless power transmitter may detect an impedance change while applying the first power. For example, when a foreign substance is recovered (S515-Y), the impedance change can be detected, and the wireless power transmitter can determine that the foreign substance has been recovered. Or if no foreign matter is recovered (S515-N), the wireless power transmitter can not detect the impedance change and the wireless power transmitter can determine that the foreign matter has not been recovered. If the foreign object is not recovered, the wireless power transmitter may output at least one of a lamp and an alarm to inform the user that the status of the current wireless power transmitter is an error condition. Accordingly, the wireless power transmitter may include an output for outputting at least one of a lamp and an alarm sound.

If it is determined that the foreign substance is not recovered (S515-N), the wireless power transmitter can maintain the latch failure mode (S513). On the other hand, if it is determined that the foreign substance is recovered (S515-Y), the wireless power transmitter can re-enter the power saving mode (S517). For example, the wireless power transmitter may apply the second powers 651 and 652 and the third powers 661 through 665 of FIG.

As described above, the wireless power transmitter can enter the latch failure mode if foreign matter is placed, rather than a wireless power receiver. In addition, the wireless power transmitter can determine whether or not the foreign object is recovered based on the impedance change based on the power applied in the latch failure mode. That is, the latch failure mode entry condition in the embodiment of FIGS. 5 and 6 may be the arrangement of the foreign matter. On the other hand, the wireless power transmitter may have various latch failure mode entry conditions in addition to the arrangement of foreign matter. For example, a wireless power transmitter may be cross-connected to a deployed wireless power receiver and may enter the latch failure mode even in this case.

Accordingly, the wireless power transmitter is required to return to the initial state upon occurrence of a cross-connection, and the recovery of the wireless power receiver is required. The wireless power transmitter may set the crossing connection in which the wireless power receiver located on the other wireless power transmitter subscribes to the wireless power network as a latch failure mode entry condition. The operation of the wireless power transmitter in the event of an error including a cross connection will be described with reference to FIG.

7 is a flowchart illustrating a method of controlling a wireless power transmitter according to an embodiment of the present invention. The control method of FIG. 7 will be described in more detail with reference to FIG. 8 is a graph illustrating a time axis of the amount of power applied by the wireless power transmitter according to the embodiment of FIG.

The wireless power transmitter can start driving (S701). In addition, the wireless power transmitter may reset the initial setting (S703). The wireless power transmitter may enter a power saving mode (S705). Here, the power saving mode may be a period in which the wireless power transmitter applies different kinds of power having different amounts of power to the power transmission unit. For example, the wireless power transmitter may be a section that applies the second detected power 801, 802 and the third detected power 811, 812, 813, 814, 815 in FIG. 8 to the power transmitter. Here, the wireless power transmitter can periodically apply the second detected powers 801 and 802 in the second period, and apply the second detected powers 801 and 802 in the second period when the second detected powers 801 and 802 are applied. The wireless power transmitter can periodically apply the third detected powers 811, 812, 813, 814 and 815 in the third period. When the third detected powers 811, 812, 813, 814 and 815 are applied And may be authorized during the third period. 812, 813, 814, and 815 are shown as being different from each other, the power value of each of the third detected powers 811, 812, 813, 814, and 815 May be different or may be the same.

On the other hand, the second detected powers 801 and 802 may be power capable of driving the wireless power receiver. More specifically, the second detected powers 801 and 802 may have a power amount capable of driving the control section and the communication section of the wireless power receiver.

The wireless power transmitter may apply the second detected powers 801 and 802 and the third detected powers 811, 812, 813, 814, and 815 to the power receiving unit in the second period and the third period, respectively. When a wireless power receiver is placed on a wireless power transmitter, the impedance seen at one point of the wireless power transmitter may change. The wireless power transmitter can detect an impedance change while the second detected power 801, 802 and the third detected power 811, 812, 813, 814, 815 are applied. For example, the wireless power transmitter can detect that the impedance changes while applying the third detected power 815. [ Accordingly, the wireless power transmitter can detect an object (S707). If no object is detected (S707-N), the wireless power transmitter can maintain a power saving mode in which different types of power are periodically applied (S705).

On the other hand, if the impedance is changed and an object is detected (S707-Y), the wireless power transmitter can enter the low power mode (S709). Here, the low power mode is a mode in which the wireless power transmitter applies driving power having an amount of power capable of driving the control section and the communication section of the wireless power receiver. For example, in FIG. 8, the wireless power transmitter may apply the driving power 820 to the power transmitter. The wireless power receiver may receive the driving power 820 to drive the control unit and the communication unit. The wireless power receiver may perform communications based on a predetermined scheme with the wireless power transmitter based on the driving power 820. [ For example, a wireless power receiver may send and receive data required for authentication, and may subscribe to a wireless power network governed by the wireless power transmitter based thereon.

Thereafter, the wireless power transmitter may enter a power transmission mode for transmitting the charging power (S711). For example, the wireless power transmitter may apply charging power 821 as in FIG. 8, and the charging power may be transmitted to the wireless power receiver.

In the power transmission mode, the wireless power transmitter can determine whether an error has occurred. Here, the error may be the presence of a foreign object on the wireless power transmitter, cross-over, over voltage, over current, over temperature, and the like. The wireless power transmitter may include a sensing unit capable of measuring an over voltage, an over current, and an over temperature. For example, the wireless power transmitter can measure the voltage or current at the reference point and can determine that the measured voltage or current exceeds the threshold value, that the overvoltage or overcurrent condition is met. Or the wireless power transmitter may include temperature sensing means and the temperature sensing means may measure the temperature of the reference point of the wireless power transmitter. If the temperature at the reference point exceeds the threshold, the wireless power transmitter may determine that the over temperature condition is met.

On the other hand, when it is determined that the overvoltage, overcurrent, overtemperature, etc. are determined according to the measurement values of the temperature, voltage, current, etc., the wireless power transmitter lowers the wireless charging power by a predetermined value to prevent overvoltage, overcurrent, do. At this time, when the voltage value of the lowered wireless charging power becomes lower than the set minimum value (for example, the minimum voltage value (VRECT_MIN_DYN) at the rear end of the wireless power receiver rectifying section), the wireless charging is stopped. Therefore, can do.

In the embodiment of FIG. 8, an error is shown in which a foreign substance is additionally disposed on the wireless power transmitter, but the error is not limited thereto, and the foreign matter may be arranged, crossed over, over voltage, over current, Those skilled in the art will readily understand that the wireless power transmitter operates in a similar fashion over temperature.

If no error occurs (S713-N), the wireless power transmitter can maintain the power transmission mode (S711). On the other hand, if an error occurs (S713-Y), the wireless power transmitter can enter the latch failure mode (S715). For example, the wireless power transmitter may apply the first powers 831 through 835 as shown in FIG. In addition, the wireless power transmitter may output an error indication including at least one of a lamp and an alarm during a latch failure mode. If it is determined that the foreign object or the wireless power receiver is not retrieved (S717-N), the wireless power transmitter can maintain the latch failure mode (S715). On the other hand, if it is determined that the foreign object or the wireless power receiver is recovered (S717-Y), the wireless power transmitter can re-enter the power saving mode (S719). For example, the wireless power transmitter may apply the second power 851, 852 and the third power 861 through 865 of FIG.

The operation in the case where an error occurs while the wireless power transmitter is transmitting the charging power has been described above. Hereinafter, the operation when a plurality of wireless power receivers receive the charging power on the wireless power transmitter will be described.

9 is a flowchart illustrating a method of controlling a wireless power transmitter according to an embodiment of the present invention. The control method of FIG. 9 will be described in more detail with reference to FIG. FIG. 10 is a graph illustrating a time axis of the amount of power applied by the wireless power transmitter according to the embodiment of FIG.

As shown in FIG. 9, the wireless power transmitter may transmit the charging power to the first wireless power receiver (S901). In addition, the wireless power transmitter may additionally subscribe the second wireless power receiver to the wireless power network (S903). The wireless power transmitter may also transmit the charging power to the second wireless power receiver (S905). More specifically, the wireless power transmitter may apply a sum of the charging power required by the first wireless power receiver and the second wireless power receiver to the power receiving unit.

FIG. 10 shows an embodiment of steps S901 to S905. For example, the wireless power transmitter may maintain a power saving mode that applies the second detected powers 1001 and 1002 and the third detected powers 1011 to 1015. Thereafter, the wireless power transmitter may detect the first wireless power receiver and enter a low power mode that maintains the detected power 1020. Thereafter, the wireless power transmitter may enter a power transmission mode that applies a first charging power 1030. The wireless power transmitter may detect the second wireless power receiver and may subscribe the second wireless power receiver to the wireless power network. In addition, the wireless power transmitter may apply a second charging power 1040 having a total amount of power required by the first and second wireless power receivers.

Referring again to FIG. 9, the wireless power transmitter can detect the occurrence of an error while transmitting the charging power to both the first and second wireless power receivers (S905) (S907). Here, the error may be a foreign matter arrangement, a cross connection, an over voltage, an over current, an over temperature, etc., as described above. If no error occurs (S907-N), the wireless power transmitter can maintain the application of the second charging power 1040. [

On the other hand, if an error occurs (S907-Y), the wireless power transmitter can enter the latch failure mode (S909). For example, the wireless power transmitter may apply the first power (1051-1055) of FIG. 10 as a first period. The wireless power transmitter may determine whether both the first wireless power receiver and the second wireless power receiver are being retrieved (S911). For example, the wireless power transmitter may detect an impedance change during the application of the first power (1051-105). The wireless power transmitter may determine whether both the first wireless power receiver and the second wireless power receiver are retrieved based on whether the impedance returns to an initial value.

If it is determined that both the first wireless power receiver and the second wireless power receiver have been recovered (S911-Y), the wireless power transmitter may enter the power saving mode (S913). For example, the wireless power transmitter can apply the second detected powers 1061 and 1062 and the third detected powers 1071 to 1075 in the second period and the third period, respectively, as shown in Fig.

As described above, even when charging power is applied to a plurality of wireless power receivers, the wireless power transmitter can easily determine whether or not a wireless power receiver or foreign matter is collected when an error occurs.

11 is a block diagram of a wireless power transmitter and a wireless power receiver in stand alone mode in accordance with an embodiment of the present invention.

The wireless power transmitter 1100 may include a communication unit 1110, a power amplifier (PA) 1120, and a resonator 1130. The wireless power receiver 1150 includes a communication unit (WPT Communication IC) 1151, an application processor (AP) 1152, a power management integrated circuit (PMIC) 1153, a wireless power integrated circuit A wireless power integrated circuit (WPIC) 1154, a resonator 1155, an interface power management IC (IFPM) 1157, a wired charge adapter (TA) 1158, Lt; RTI ID = 0.0 > 1159 < / RTI >

The communication unit 1100 may be implemented as a WiFi / Bluetooth combo IC and may perform communication with the communication unit 1151 based on a predetermined method, for example, a BLE method. For example, the communication unit 1151 of the wireless power receiver 1150 may transmit a PRU dynamic (PRU Dynamic) signal having the data structure of Table 1 to the communication unit 1110 of the wireless power transmitter 1100. As described above, the PRU dynamic signal may include at least one of voltage information, current information, temperature information, and warning information of the wireless power receiver 1150.

Based on the received PRU dynamic signal, the output power value from the power amplifier 1120 can be adjusted. For example, when overvoltage, overcurrent, and overtemperature are applied to the wireless power receiver 1150, the power value output from the power amplifier 1120 may be reduced. In addition, when the voltage or current of the wireless power receiver 1150 is less than a predetermined value, the power value output from the power amplifier 1120 may be increased.

The charging power from the resonator 1130 can be transmitted to the resonator 1155 wirelessly.

The wireless power integrated circuit 1154 can rectify and DC / DC convert the charging power received from the resonator 1155. The wireless power integrated circuit 1154 allows the converted power to drive the communication unit 1151 or to charge the battery 1159. [

On the other hand, the wire charging adapter 1158 may be connected to the wire charging terminal. The wired charging adapter 1158 can receive a wired charging terminal such as a 30-pin connector or a USB connector and can charge the battery 1159 by receiving power supplied from an external power source.

The interface power management integrated circuit 1157 can process the power applied from the wire charging terminal and output it to the battery 1159 and the power management integrated circuit 1153. [

The power management integrated circuit 1153 can manage power received wirelessly or wired, and power applied to each of the components of the wireless power receiver 1150. [ The application processor 1152 may control the communication unit 1151 to receive power information from the power management integrated circuit 1153 and to transmit a PRU dynamic (PRU Dynamic) signal to report it.

The node 1156 connected to the wireless power integrated circuit 1154 may also be coupled to a wired charging adapter 1158. When a wired charging connector is connected to the wired charging adapter 1158, a predetermined voltage, for example, 5V, may be applied to the node 1156. [ The wireless power integrated circuit 1154 may monitor the voltage applied to the node 1156 to determine whether the wired charging adapter is enabled.

On the other hand, the application processor 1152 has a stack of a predetermined communication method, for example, a WiFi / BT / BLE stack. Accordingly, the communication communication unit 1151 for wireless charging loads the stack from the application processor 1152, and then, based on the stack, communicates with the communication unit 1110 of the wireless power transmitter 1100 using the BT and BLE communication methods Communication can be performed.

However, when the application processor 1152 is in a state in which power can not be obtained from the application processor 1152 to perform wireless power transmission or when the application processor 1152 is in the process of taking and using the data from the memory in the application processor 1152, A state in which power is lost to such an extent that the application processor 1152 can not maintain the ON state may occur.

Thus, when the remaining capacity of the battery 1159 becomes less than the minimum power threshold, the application processor 1152 is turned off and some components for wireless charging arranged inside the wireless power receiver, such as the communication unit 1151, The integrated circuit 1154, the resonator 115, or the like. Here, a state in which the application processor 1152 can not supply enough power to turn on can be referred to as a dead battery state.

In this dead battery state, since the application processor 1152 is not driven, the communication unit 1151 can not receive a stack of a predetermined communication method, for example, a WiFi / BT / BLE stack from the application processor 1152. In this case, some stacks of the predetermined communication type stack, for example, a BLE stack, may be fetched from the application processor 1152 in the memory 1162 of the communication unit 1151 and stored. Accordingly, the communication unit 1151 can perform communication with the wireless power transmitter 1100 for wireless charging using the stack of the communication scheme stored in the memory 1162, that is, the wireless charging protocol. At this time, the communication unit 1151 may include an internal memory. In the SA mode, the BLE stack may be stored in a ROM-type memory.

As described above, performing the communication using the stack of the communication method stored in the memory 1162 by the communication unit 1151 can be referred to as a stand alone mode. Accordingly, the communication unit 1151 can manage the charging procedure based on the BLE stack.

[0033] In the foregoing, the concept of the wireless charging system that can be applied to the embodiment of the present invention has been described with reference to FIG. 1 to FIG. Hereinafter, a charging control process according to mode switching according to an embodiment of the present invention will be described in detail with reference to FIGS. 12 to 15. FIG.

12 is a block diagram of a wireless power transmitter and a wireless power receiver in a NAS (Non Stand Alone) mode according to an embodiment of the present invention. 12 are the same as those in FIG. 11, and a detailed description thereof will be omitted. 12, the remaining capacity of the battery 1159 is equal to or greater than a predetermined threshold value, and the application processor 1152, the power management integrated circuit (PMIC) 1153, the interface power management integrated circuit (IFPM) 1157, And a wired charging adapter (TA) 1158 are activated.

In a state where the application processor 1152 is off, when the remaining capacity of the battery 1159 becomes the minimum power threshold value, the application processor 1152 can wake up and be driven. When the application processor 1152 is activated, the communication unit 1151 receives a stack of a predetermined communication method, such as a WiFi / BT / BLE stack, from the AP 1152, and loads the WiFi / BT / BLE stack into the memory 1162. At this time, the communication unit 1151 can load the communication stack fetched from the AP 1152 in the NSA mode into the ROM-type memory and store the communication stack. As described above, the communication unit 1151 may receive a stack of the communication method for wireless charging from the application processor 1152 and load it into the memory 1162 in the NSA (non-stand alone) mode.

At this time, as the application processor 1152 is driven, it takes a certain time until the mode switching is completed.

The mode transition time is the time required when the wireless power receiver 1150 transitions from the SA mode to the NSA mode, typically about 3 seconds. During this mode switching time, the wireless power receiver 1150 may experience a registration timeout of about one second because no communication response is made with the wireless power transmitter 1100. [ Thus, in an embodiment of the present invention, the wireless power receiver 1150 informs the wireless power transmitter 1100 that mode switching from the SA mode to the NSA mode will occur through the mode switching bit as in Table 3, The power can be requested to be maintained for a while.

Referring to FIG. 13, the operation of the wireless power transmitter and the wireless power receiver having the above configuration will be described.

13 is a flowchart illustrating operations of a wireless power transmitter and a wireless power receiver according to an embodiment of the present invention.

The wireless power transmitter 1100 may transmit a charge start command signal to the wireless power receiver 1150 (S1301). In response, the wireless power receiver 1150 may control the load switch to be turned on to perform wireless charging (S1302). The wireless power receiver 1150 transmits a PRU dynamic signal (S1303), and the wireless power transmitter 1100 receives and interprets a PRU dynamic signal (S1304). Accordingly, the wireless power transmitter 1100 can identify information such as the voltage, current, and temperature of the wireless power receiver 1150 or wireless charging environment change information such as wired charging terminal input.

On the other hand, the user can input the wired charging terminal into the wireless power receiver 1150, and the wireless power receiver 1150 can detect this (S1305). The wireless power receiver 1150 may determine whether wired or wireless power is provided (S1306). If both wired and wireless power is not provided (S1306-N), the wireless power transmitter 1100 may enter the low power mode (S1307). The IFPM 1157 of the wireless power receiver 1150 releases the connection from the resonator 1155 to stop the wireless charging (S1308) .

The wireless power receiver 1150 can output the wired charging terminal receiving detection to the communication unit 1151 (S1309) and the communication unit 1151 can transmit the wired charging terminal receiving detection signal to the wireless power transmitter 1100 ( S1310). The wireless power transmitter 1100 may adjust the charging power accordingly (S1311). For example, the wireless power transmitter 1100 may adjust the charging power to zero to control the wireless charging to be interrupted.

The wireless power transmitter 1100 may direct the power ratio reception (S1312) and the wireless power transmitter 1100 may transmit the load switch off signal to the wireless power receiver 1150 (S1313). The wireless power receiver 1150 receives the load switch off signal and can control the load switch to the off state (S1314).

The wireless power receiver 1150 may also periodically transmit the PRU Dynamic signal (S1315). The wireless power transmitter 1100 may receive and interpret the wireless power receiver dynamic (PRU Dynamic) signal (S1316).

On the other hand, the wireless power receiver 1150 can detect that the wired charging terminal is released (S1317). For example, the wireless power receiver 1150 may sense a change in the voltage applied to the rear end of the wired charging adapter 1158 to sense the release of the wired charging terminal inlet. The wireless power receiver 1150 may transmit the release detection signal of the wired charging terminal input to the wireless power transmitter 1100 (S1318). For example, the wireless power receiver 1150 may transmit a PRU dynamic (PRU Dynamic) signal or a release detection signal of a wired charging terminal input as a sole signal. The wireless power transmitter 1100 may interpret the PRU dynamic signal or the singular signal to determine that the wire charging terminal entrance to the wireless power receiver 1150 is released (S1319).

The wireless power transmitter 1100 may send a load switch on signal to the wireless power receiver 1150 (S1320) and the wireless power receiver 1150 may receive the load switch on signal to control the load switch to the on state (S1321). Meanwhile, the wireless power transmitter 1100 may re-adjust the charging power to perform wireless charging, and the wireless power receiver 1150 may control the load switch to be on-state to perform wireless charging.

In accordance with the above, the wireless power transmitter 1100 can grasp that the wired charging terminal is pulled in or out of the wireless power receiver 1150. The wireless power transmitter can adjust the charging power according to the incoming or outgoing wired charging terminal so that power wastage and over-powering of the wireless power receiver 1150 can be prevented.

Meanwhile, the wireless power receiver 1150 can not drive the application processor 1152 when the battery 1159 is discharged during the above operation. At this time, the wireless power receiver 1150 may be placed on the wireless power transmitter 1100 with the battery 1159 discharged.

In this case, the wireless power receiver 1150 may receive the beacon for power detection and may drive the communication unit 1151 of the wireless power receiver 1150. However, since the application processor 1152 is not driven as described above, the communication unit 1151 can not fetch a predetermined communication stack, for example, a wireless charging protocol from the application processor 1152. [ Accordingly, the communication unit 1151 operates in a stand alone mode in which communication is performed using a stack of a communication method stored in a memory in the communication unit 1151. [

Hereinafter, a control procedure according to mode switching in the wireless power receiver will be described with reference to FIG.

Referring to FIG. 14, the wireless power receiver 1150 monitors the battery 1159 (S1500) and determines whether the battery value is less than a preset threshold value (S1505). If the battery value is less than a predetermined threshold, the wireless power receiver 1150 may be powered off by the discharge of the battery 1159. [ In this case, it is assumed that the battery 1159 is disposed on the wireless power transmitter 1100 in a discharged state in the embodiment of the present invention. Accordingly, the wireless power receiver 1150 can receive the first power capable of driving the communication unit 1151 from the wireless power transmitter 1100, and can drive the communication unit 1151 using the first power. Therefore, when the battery 1159 is discharged and the battery value becomes less than a preset threshold value, the SA mode can be entered (S1510).

Upon entering the SA mode, the wireless power receiver 1150 may load a BLE stack, for example, from the memory 1162 in the communication unit 1151 (S1515). The communication unit 1151 of the wireless power receiver 1150 may communicate with the wireless power transmitter 1100 using the loaded BLE stack (S1520).

Thus, the wireless power receiver 1150 can perform wireless charging while operating in the SA mode. Based on the wireless charging performance, the battery 1159 begins to charge. Thus, it is determined whether the battery value is equal to or greater than a preset threshold value (S1525). If the battery value is greater than or equal to a predetermined threshold, the wireless power receiver 1150 may turn on the battery 1159 and the application processor 1152. [ Accordingly, the wireless power receiver 1150 can switch from the SA mode to the NSA mode (S1530). However, if the battery value is not equal to or greater than the predetermined threshold value, the power is not charged enough to turn on the application processor 1152, and the process returns to step S1520 to transmit the power to the wireless power transmitter 1100).

At this time, the wireless power transmitter 1100 is in a power transfer state, and when the wireless power receiver 1150 is powered on, the communication unit 1151 needs to re-initialize during a charging session . That is, in the procedure for resetting the communication unit 1151, it is required to terminate and restart the BLE link between the wireless power receiver 1150 and the wireless power transmitter 1100. Thus, if the wireless power receiver 1150 is turned on and needs to restart the BLE link with the wireless power transmitter 110, the wireless power receiver 1150 can send this situation to the wireless power transmitter 1100 by generating a mode change notification message. .

The alert information (PRU Alert) shown in Table 3 may be used for the mode change notification message. Accordingly, the mode change notification message is a message for requesting power to be maintained during the mode change time, and may include a time required to complete the mode change, that is, a time required for switching the mode, as shown in Table 4. Such a mode switching notification message may be generated and transmitted by the communication unit 1151 or the application processor 1152.

Accordingly, the wireless power receiver 1150 can transmit the mode switching notification message to the wireless power transmitter 1100 (S1535). The wireless power receiver 1150 may then load the WiFi / BT / BLE stack from the application processor 1152 and resume communication with the wireless power transmitter 1100 based on this stack (S1540).

Meanwhile, FIG. 15 is a flowchart illustrating a method of controlling a wireless power transmitter according to mode switching according to one embodiment of the present invention.

Referring to FIG. 15, the wireless power transmitter 1100 may transmit the charging power to the wireless power receiver 1150 (S1600). The wireless power transmitter 1100 may receive a mode change notification message from the wireless power receiver 1150 indicating that the SA mode is switched to the NSA mode (S1605). At this time, the mode switching notification message includes the time required for switching the mode set by the wireless power receiver 11500. Therefore, the wireless power transmitter 1100 detects the time required for mode switching included in the mode switching notification message The wireless power transmitter 1100 can wait for the set time, and can maintain the output power for the required time according to the mode switching (S1615).

The wireless power transmitter 1100 may be configured to exclude the wireless power receiver 1150 from the wireless power network if no signal is received for one second from the wireless power receiver 1150. [ However, in accordance with an embodiment of the present invention, when a mode change notification message is received from the wireless power receiver 1150, the wireless power transmitter 1100 may transmit the wireless power 1150 even if no signal is received from the wireless power receiver 1150 during the set period of time The receiver 1150 may not be excluded from the wireless power network.

Accordingly, the wireless power transmitter 1100 determines whether the waiting time exceeds the set time (S1620). If the waiting time exceeds the set time, the wireless power receiver may be regarded as a rouge object and excluded from the wireless power network (S1630). That is, the wireless power transmitter 1100 terminates the connection with the wireless power receiver 1150. However, if the waiting time is within the set required time, the mobile communication terminal can perform communication again with the wireless power receiver 1150 (S1630).

In accordance with the foregoing, communication with the wireless power transmitter 1100 may be interrupted for a certain amount of time when the wireless power receiver 1150 switches from the SA mode to the NSA mode. However, the wireless power transmitter 1100 may be configured to receive the switching signal from the SA mode to the NSA mode and to transmit the wireless power receiver 1150 to the wireless power network 1150 even if no signal is received from the wireless power receiver 1150 for a predetermined waiting time. It may not be excluded. Accordingly, it is possible to prevent the occurrence of unintended errors caused by mode switching of the wireless power receiver.

As described above, the wireless power transmitter 1100 can grasp a wireless power transmission environment change such as mode switching, and accordingly, the wireless power receiver 1150 can be prevented from being excluded from the wireless power network.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. 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 (38)

A method of controlling a wireless power receiver,
Determining whether to perform mode switching;
Sending a message indicating the mode change to a wireless power transmitter, the message including a period during which a mode change procedure is in progress;
Receiving power for charging from the wireless power transmitter for a duration of time during which the mode switching procedure proceeds;
/ RTI >
Wherein the mode switching is for informing that the communication unit of the wireless power receiver is to be restarted for a duration of a period during which the mode switching procedure is in progress. The method according to claim 1,
The mode switching includes switching from a stand alone mode to a non-stand alone mode,
Wherein the wireless power receiver communicates with the wireless power transmitter based on a communication stack stored in a memory of a communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the SA mode,
Wherein the wireless power receiver is configured to communicate with the wireless power transmitter based on a communication stack stored outside the memory of the communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the NSA mode, Gt; of claim < / RTI > 3. The method of claim 2,
Wherein the determining whether to perform the mode switching comprises:
Communicating with the wireless power transmitter based on the SA mode if the remaining capacity of the battery of the wireless power receiver is less than a predetermined threshold;
Determining to perform the mode switching if the remaining capacity of the battery of the wireless power receiver is greater than or equal to the preset threshold value; And
An operation for communicating with the wireless power transmitter based on the NSA mode after performing the mode change from the SA mode to the NSA mode;
/ RTI > The method according to claim 1,
Wherein the mode switching informs that communication between the wireless power transmitter and the wireless power receiver can not be performed for a duration of time during which the mode switching procedure is in progress. The method according to claim 1,
Wherein the wireless power transmitter maintains transmission of the power for charging for a duration of time during which the mode switching procedure proceeds from the time the message is received. The method according to claim 1,
Wherein the act of transmitting the message comprises generating a Power Receiving Unit (PRU) dynamic signal or a PRU alert signal. The method according to claim 6,
Wherein the PRU warning signal includes information on a period during which the mode switching procedure is performed. 8. The method of claim 7,
Wherein the information on the period during which the mode switching procedure is performed includes one of the bits for the mode switching,
Wherein the bits for the mode transition comprise a first value, a second value, a third value and a fourth value. 9. The method of claim 8,
Wherein the first value indicates that there is no mode change and the second value indicates that the duration of the period during which the mode change procedure is in progress is two seconds and the third value indicates the duration of the period in which the mode change procedure is in progress And the fourth value indicates that the duration of the period during which the mode switching procedure is performed is six seconds. In a wireless power receiver,
A control unit for determining whether to perform a mode switching; And
A communication unit for transmitting a message indicating the mode change to a wireless power transmitter, the message including a period during which a mode change procedure is performed; And
And a resonator for receiving power for charging from the wireless power transmitter for a duration of time during which the mode switching procedure is performed,
Wherein the mode switching is for informing that the communication unit of the wireless power receiver is to be restarted for a duration of time during which the mode switching procedure is in progress. 11. The method of claim 10,
The mode switching includes switching from a stand alone mode to a non-stand alone mode,
Wherein the wireless power receiver communicates with the wireless power transmitter based on a communication stack stored in a memory of a communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the SA mode,
Wherein the wireless power receiver is configured to communicate with the wireless power transmitter based on a communication stack stored outside the memory of the communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the NSA mode, Wireless power receiver. 12. The method of claim 11,
Wherein the communication unit is configured to communicate with the wireless power transmitter based on the SA mode if the remaining capacity of the battery of the wireless power receiver is less than a predetermined threshold value,
Wherein the controller determines to perform the mode switching when the remaining capacity of the battery of the wireless power receiver is equal to or greater than the preset threshold value,
And the communication unit communicates with the wireless power transmitter based on the NSA mode after performing the mode switching from the SA mode to the NSA mode. 11. The method of claim 10,
Wherein the mode switching informs that communication between the wireless power transmitter and the wireless power receiver can not be performed for a duration of time during which the mode switching procedure proceeds. 11. The method of claim 10,
Wherein the communication unit is a WiFi / Bluetooth combo IC. 11. The method of claim 10,
Wherein the wireless power transmitter maintains transmission of the power for charging for a duration of time during which the mode switching procedure proceeds from the time the message is received. 11. The method of claim 10,
Wherein the message is a PRU (Power Receiving Unit) dynamic signal or a PRU warning signal. 17. The method of claim 16,
Wherein the PRU warning signal includes information on a period during which the mode switching procedure is performed. 18. The method of claim 17,
Wherein the information on the period during which the mode switching procedure is performed includes one of the bits for the mode switching,
Wherein the bits for the mode transition comprise a first value, a second value, a third value and a fourth value. 19. The method of claim 18,
Wherein the first value indicates that there is no mode change and the second value indicates that the duration of the period during which the mode change procedure is in progress is two seconds and the third value indicates the duration of the period in which the mode change procedure is in progress And the fourth value indicates that the duration of the period during which the mode switching procedure is in progress is six seconds. A method for controlling a wireless power transmitter,
Transmitting power for charging to a wireless power receiver;
Receiving, from the wireless power receiver, a message indicating a mode transition within the wireless power receiver, the message including a period during which a mode switching procedure is in progress; And
During the duration of the period in which the mode switching procedure is performed,
/ RTI >
Wherein the mode switching is for notifying that the communication unit of the wireless power receiver is to be restarted for a duration of time during which the mode switching procedure is in progress. 21. The method of claim 20,
The mode switching includes switching from a stand alone mode to a non-stand alone mode,
Wherein the wireless power receiver communicates with the wireless power transmitter based on a communication stack stored in a memory of a communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the SA mode,
Wherein the wireless power receiver is configured to communicate with the wireless power transmitter based on a communication stack stored outside the memory of the communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the NSA mode, Gt; of claim < / RTI > 22. The method of claim 21,
If the remaining capacity of the battery of the wireless power receiver is less than a predetermined threshold, the wireless power receiver communicates with the wireless power transmitter based on the SA mode,
Wherein the wireless power receiver determines to perform the mode switching if the remaining capacity of the battery of the wireless power receiver is greater than or equal to the preset threshold value,
Wherein the wireless power receiver communicates with the wireless power transmitter based on the NSA mode after performing the mode transition from the SA mode to the NSA mode. 21. The method of claim 20,
Wherein the mode switching is to indicate that communication between the wireless power transmitter and the wireless power receiver can not be performed for a duration of time during which the mode switching procedure is in progress. 21. The method of claim 20,
The operation of maintaining the transmission of the power during the duration of the mode switching procedure may include transmitting the power for charging for a duration of time during which the mode switching procedure proceeds from the time the message is received Gt; of the wireless power transmitter. 21. The method of claim 20,
Wherein the message is a PRU (Power Receiving Unit) dynamic signal or a PRU warning signal. 26. The method of claim 25,
Wherein the PRU warning signal includes information on a period during which the mode switching procedure is performed. 27. The method of claim 26,
Wherein the information on the period during which the mode switching procedure is performed includes one of the bits for the mode switching,
Wherein the bits for the mode transition comprise a first value, a second value, a third value and a fourth value. 28. The method of claim 27,
Wherein the first value indicates that there is no mode change and the second value indicates that the duration of the period during which the mode change procedure is in progress is two seconds and the third value indicates the duration of the period in which the mode change procedure is in progress And the fourth value indicates that the duration of the period during which the mode switching procedure is performed is six seconds. In a wireless power transmitter,
A resonator for transmitting power for charging to a wireless power receiver;
A communication unit for receiving, from the wireless power receiver, a message indicating a mode change in the wireless power receiver, the message including a period during which a mode change procedure is performed; And
A control unit for controlling the transmission of the power during the duration of the period during which the mode switching procedure is performed,
/ RTI >
Wherein the mode switching is for informing that the communication unit of the wireless power receiver is to be restarted for a duration of time during which the mode switching procedure is in progress. 30. The method of claim 29,
The mode switching includes switching from a stand alone mode to a non-stand alone mode,
Wherein the wireless power receiver communicates with the wireless power transmitter based on a communication stack stored in a memory of a communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the SA mode,
Wherein the wireless power receiver is configured to communicate with the wireless power transmitter based on a communication stack stored outside the memory of the communication portion of the wireless power receiver when the wireless power receiver communicates with the wireless power transmitter based on the NSA mode, Wireless power transmitter. 31. The method of claim 30,
If the remaining capacity of the battery of the wireless power receiver is less than a predetermined threshold, the wireless power receiver communicates with the wireless power transmitter based on the SA mode,
Wherein the wireless power receiver determines to perform the mode switching if the remaining capacity of the battery of the wireless power receiver is greater than or equal to the preset threshold value,
Wherein the wireless power receiver communicates with the wireless power transmitter based on the NSA mode after performing the mode switch from the SA mode to the NSA mode. 30. The method of claim 29,
Wherein the communication unit is a wireless power transmitter in which the communication unit is a WiFi / Bluetooth (Combo) IC. 30. The method of claim 29,
Wherein said mode switching informs that communication between said wireless power transmitter and said wireless power receiver can not be performed for a duration of time during which said mode switching procedure is in progress. 30. The method of claim 29,
Wherein the control unit controls to maintain transmission of the power for charging for a duration of time during which the mode switching procedure is performed from the time the message is received. 30. The method of claim 29,
Wherein the message is a PRU (Power Receiving Unit) dynamic signal or a PRU warning signal. 36. The method of claim 35,
Wherein the PRU warning signal includes information on a period during which the mode switching procedure is performed. 37. The method of claim 36,
Wherein the information on the period during which the mode switching procedure is performed includes one of the bits for the mode switching,
Wherein the bits for the mode transition comprise a first value, a second value, a third value and a fourth value. 39. The method of claim 37,
Wherein the first value indicates that there is no mode change and the second value indicates that the duration of the period during which the mode change procedure is in progress is two seconds and the third value indicates the duration of the period in which the mode change procedure is in progress And the fourth value indicates that the duration of the period during which the mode switching procedure is performed is six seconds.

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