KR20140076486A - Integrated circuit for wireless power charging and method for operating the integrated circuit - Google Patents

Abstract

An integrated circuit for wireless charge according to an embodiment of the present invention includes a first wireless communication unit which supports a first wireless communication method; a second wireless communication unit which supports a second wireless communication method; a first path selection unit which selects one of first power input according to wired charge and second power input according to the wireless charge to receive power; a second path selection unit which selects one of third power input of a battery and fourth power input according to the wireless charge to receive the power; a power control unit which receives the power from one of the first path selection unit and the second path selection unit; and a control unit which controls the operation of the first path selection unit and the second path selection unit. Therefore, the present invention is provided to enable an existing WIFI/BT 4.0 combo IC to perform signaling in the wireless charge, thereby wirelessly charging the terminal in a dead battery situation.

Description

[0001] INTEGRATED CIRCUIT FOR WIRELESS POWER CHARGING AND METHOD FOR OPERATING THE INTEGRATED CIRCUIT [0002]

The present invention relates to wireless charging, and more particularly to a WiFi / Bluetooth combo IC (Integrated Circuit) applicable in the wireless charging field.

In recent wireless charging resonance systems, it has been decided to follow the BLE (Bluetooth Low Energy) standard for signaling in A4WP (Alliance for Wireless Power). Accordingly, the user may use a BLE (eg, BT 4.0 standard) single IC or a WIFI / BT 4.0 combo IC as desired, but only the BLE specification in signaling.

However, the I / F of the BT / WIFI combo IC is very complicated to use the existing BT / WIFI combo IC for wireless charging signaling purposes. The WIFI / BT combo IC is controlled by AP (Application Processor). In order to use it for wireless charging purpose, the WIFI / BT combo IC must be controlled in order of AP → WIFI / BT combo IC → wireless charging power IC, .

1 is a diagram illustrating a structure of a terminal equipped with a wireless charging device according to an embodiment of the related art. Referring to FIG. 1, when the wireless charging device is inserted into the terminal 10, that is, when it is mounted in the terminal 10 between the back cover 15 in which the resonator is built, a separate IC (BLE single IC IC 16 or WIFI / BT combo IC 17 in Fig. 1) should be used.

2 is a diagram illustrating a structure of a terminal equipped with a wireless charging device according to another embodiment of the related art. The WIFI / BT combo IC 19 used in the terminal 20 may be used instead of the BLE single IC 18 as shown in FIG. The BT / WIFI combo IC 19 incorporated in the terminal 20 can be used to control the operation of the terminal 20 regardless of whether the back cover 15 having the resonator is mounted or not, There is a problem that charging can not be performed.

Generally, in the case of a combo chip in which WIFI and BT are implemented as a single chip, a Bluetooth core and a Wi-Fi core operate as a master core. Therefore, in order to communicate using BT and BLE communication method, it is necessary to operate a Wi-Fi core consuming a large amount of power. Moreover, in order to use the BT and BLE communication methods, the BT and the BLE profiles necessary for the communication exist in the stack in the AP, and wireless charging using the BT and BLE communication methods becomes impossible before the AP is driven. That is, wireless charging can not be performed in a dead battery condition in which the AP can not be driven.

At least one embodiment of the invention at least partially solves, alleviates or eliminates at least one of the problems and / or disadvantages associated with the prior art.

Accordingly, at least one embodiment of the present invention allows the WIFI / BT combo IC to perform signaling upon wireless charging to enable wireless charging even in a dead battery situation.

An integrated circuit for wireless charging according to an embodiment of the present invention includes a first wireless communication unit supporting a first wireless communication scheme, a second wireless communication unit supporting a second wireless communication scheme, a first wireless communication unit supporting a first wireless communication scheme, A first path selector for selecting either one of a power input and a second power input according to wireless charging to be input; and a third power input from the battery and a fourth power input due to wireless charging A power control unit receiving power from any one of the first path selecting unit and the second path selecting unit, and a second path selecting unit selecting one of the first path selecting unit and the second path selecting unit, And a control unit for controlling the operation.

In the wireless charging method in an integrated circuit for wireless charging according to an embodiment of the present invention, it is determined whether there is at least one power input among a first power input according to wire charging and a second power input according to wireless charging Selecting one of a first power input corresponding to the wire charging and a second power input corresponding to the wireless charging so that the first power input corresponding to the wire charging is supplied; And performing a wireless network communication or a non-contact short-range wireless communication by receiving a power input.

In accordance with at least one embodiment of the present invention, a WIFI / BT combo IC used in a wireless power receiver can perform signaling during wireless charging, thereby saving space in a wireless power receiver and reducing the cost of manufacturing a wireless power receiver At the same time, it is possible to wirelessly charge the wireless power receiver even in a dead battery condition in which the wireless power receiver is off because there is no battery of the wireless power receiver.

FIG. 1 illustrates a structure of a terminal having a wireless charging device according to an embodiment of the present invention,
2 is a diagram illustrating a structure of a terminal having a wireless charging device according to another embodiment of the related art,
3 is a block diagram illustrating a structure of a wireless power receiver incorporating a WIFI / BT combo IC according to an embodiment of the present invention.
FIG. 4 illustrates a structure of a WIFI / BT combo IC according to an embodiment of the present invention.
5 is an internal circuit diagram of a wireless power receiver according to an embodiment of the present invention;
6 is an internal circuit diagram of a wireless power receiver according to another embodiment of the present invention;
7 is an internal circuit diagram of a wireless power receiver according to another embodiment of the present invention;
FIG. 8 is a flowchart illustrating an operation of a wireless power receiver according to a wireless charging input during a wired charging and a wired charging in an off state according to an embodiment of the present invention;
FIG. 9 is a flowchart illustrating an operation according to a wired charging input during wireless charging and wireless charging in the off state of the wireless power receiver according to an embodiment of the present invention;
10 is a flowchart illustrating an operation of a wireless power receiver according to an exemplary embodiment of the present invention,
11 is a flowchart illustrating an operation of the wireless power receiver according to wireless charging in an on state according to an embodiment of the present invention,
12 is an operational flow diagram according to a wired charge input during wireless charging in the on state of a wireless power receiver in accordance with an embodiment 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.

In the embodiment of the present invention, the wireless power receiver is a device driven by a rechargeable battery and may be called a terminal, a mobile terminal, a mobile terminal, a communication terminal, a portable communication terminal, a portable mobile terminal, or the like. To charge such a battery, a separate charging device is used to supply electric energy to the battery of the wireless power receiver. Generally, the charging device and the battery are each provided with a separate contact terminal, so that the charging device and the battery are electrically connected to each other, and the power supplied through the charging device and the battery is called wired power. On the other hand, the supplied power may be referred to as wireless power depending on the manner in which the battery is automatically charged by simply placing the wireless power receiver on a charging pad without connecting it to a separate charging device.

A typical configuration of such an electronic device is for a cellular phone, and in a typical configuration of such an electronic device, some of the components may be omitted or changed as needed.

3 is a block diagram illustrating a structure of a wireless power receiver incorporating a WIFI / BT combo IC according to an embodiment of the present invention. A typical configuration of the wireless power receiver in FIG. 3 is for a portable terminal, and in a typical configuration of such a wireless power receiver, some components may be omitted or changed as needed. 3, the terminal 100 includes an application processor (AP) 110, a power management integrated circuit (PMIC) 120, a charging unit (WPT POWER IC) 130, And a WIFI / BT combo IC 150.

A back cover 200 including a resonator is mounted on the terminal 100 and the terminal 100 includes a WIFI / BT combo IC 150 and is connected to the battery 300. The WIFI / BT combo IC 150 is connected to a serial interface (I / F), an interrupt, and a power (for example, a battery 300).

First, the resonator serves to receive the wireless resonance signal transmitted from the resonance signal generator of the wireless power transmitter.

The AP 110 may include an integrated control chip that performs various functions such as various data conversion, memory control, and bus control of a central processing unit (CPU). The AP 110 includes a nonvolatile memory. Data required for low-power wireless communication such as a BT profile and a BLE profile and data (Wi-Fi profile and the like) necessary for wireless network communication such as Wi-Fi are stored in the nonvolatile memory have.

The AP 110 operates through the following process. First, the AP 110 installed in the terminal 100 is set to wake up when a power-on request is input. Accordingly, when the power-on request is input, the wireless power receiver checks the state of the battery 300 and wakes the AP 110 when the battery level is equal to or higher than the threshold.

The PMIC 120 performs charging with the operating power and the PMIC 120 has a function of receiving wired power supplied from the battery 300 mounted in the terminal 100 and a function of receiving the wired power from the wireless power transmitter, And a function to charge the battery 300 or to transmit wireless power to the low power wireless communication unit in the WIFI / BT combo IC 150. [

The charging unit (WPT POWER IC) 130 includes an EMI (ElectroMagnetic Interference) filter 131, an active synch buck 132, a synchronous buck 133, an output enabler O) 138, an OVP clamping circuit 135, a low dropout linear regulator (LDO) 136, an analog-to-digital converter (ADC) 137, and a serial I / As shown in FIG.

First, the EMI filter 131 removes noise from a signal received through the resonator. The active synchronous rectifier 132 and the LDO 136 rectify the alternating current (AC) power received through the resonator to direct current (DC). The sync buck 133 serves to provide 5V for the other components, e.g., the PMIC 120. [ In this way, the active synchronous rectifier 132, the synchronous buck 133 and the LDO 136 may be employed to regulate the battery power to supply the pre-regulated power as the power of each component of the wireless power receiver. In addition, the OVP clamping circuit 135 may be employed to prevent power loss due to power supply voltage overhead. The serial I / O 138 is connected to the serial I / O 152 of the WIFI / BT combo IC 150 via the I 2 C and is connected to an MCU 153 of the WIFI / BT combo IC 150. Can be connected via INT.

The WIFI / BT combo IC 150 is a contactless short-range wireless communication unit that supports a first wireless communication scheme and a second wireless communication scheme. Examples of the first wireless communication method and the second wireless communication method include a wireless network function and a low power wireless communication function. Among them, a wireless network function is handled in a WiFi communication section, a low power wireless communication function is a BT communication section, BLE communication department. Here, the WiFi communication unit is connected to the RF switching unit 151 under the control of a BT communication unit operating as a master for connection with an external server or performing an operation.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. 4 is a diagram illustrating the structure of the WIFI / BT combo IC shown in FIG. 4, the terminal 100 according to the embodiment of the present invention can wake up the WIFI / BT combo IC 150 during wireless charging even in a dead battery situation. At this time, the dead battery condition indicates a state in which the battery 300 of the terminal 100 is not discharged and the power of the terminal 100 is turned off. In an embodiment of the present invention, a WIFI / BT combo IC 150 capable of charging wirelessly even when the terminal 100 is powered off is provided.

Referring to FIG. 4, a first path selector 154 and a second path selector 155 may be connected to the power terminal of the WIFI / BT combo IC 150. The first path selector 154 and the second path selector 155 may be switching circuits controlled by the MCU 153 in the WIFI / BT combo IC 150 via a control line. The first path selector 154 and the second path selector 155 may be referred to as a reverse blocking circuit. The internal power stage 156 may switch the external input power to provide at least one of a conventional power source received from a 1.8 V power source, a battery, etc., a power source supplied via wireless charging, or a 1.8 V power source supplied through wireless charging You can choose according to the situation. The internal power stage 156 serves as a power control block that receives power and supplies power to each component in the WIFI / BT combo IC 150. The internal power stage 156 includes a first path selector 154, 2 path selection unit 155. The power supply unit 150 may be a power supply unit or a power supply unit.

The first path selector 154 selects one of the first power input according to the wire charging and the second power input according to the wireless charging under the control of the MCU 153. [

The second path selection unit 155 selects one of the third power input from the battery and the fourth power input due to the wireless charging under the control of the MCU 153.

The power control unit 156 serving as the internal power supply unit 156 receives power from any one of the first path selection unit 154 and the second path selection unit 155 and receives power from the first path selection unit 154 and the second path selection unit 155, And supplies power to each component. For example, when there is only an existing power source (existing 1.8V or a conventional power source such as a battery), the first path selector 154 selects the internal power source 156 by control signaling from the WIFI / BT combo IC 150, So that the existing power source can be input. If you have both a conventional power supply and a wireless charging power source (1.8V from wireless charging or a power source from wireless charging), you can get input from the existing power source preferentially. Also, if there is no existing power supply and only the power is supplied from the wireless rechargeable power source, the internal power source 156 may be supplied with power from the wireless rechargeable power source and used as an input.

As another example, in the presence of a conventional power source, the internal power source 156 may utilize the supply from an existing power source as an input. The second path selection unit 155 may be configured such that the wireless power is preferentially input to the internal power supply terminal 156 by control signaling from the WIFI / BT combo IC 150 can do. Also, if there is no existing power supply and only the power is supplied from the wireless rechargeable power source, the internal power source 156 may be supplied with power from the wireless rechargeable power source and used as an input. The power provided through the internal power supply terminal 156 is provided to the respective components in the WIFI / BT combo IC 150. The power supplied through the internal power supply terminal 156 may be used to perform wireless network communication or non-contact short-range wireless communication.

5 is an internal circuit diagram of a power receiver according to an embodiment of the present invention.

FIG. 5 illustrates connection relationships and input signals between respective components. Here, the internal circuit configuration of the power receiver may be configured as shown in FIG. 5, but may alternatively be configured as shown in FIG. 6 and FIG. FIG. 6 is an internal circuit diagram of a power receiver according to another embodiment of the present invention, and FIG. 7 is an internal circuit diagram of a power receiver according to another embodiment of the present invention. 5 to 7 are denoted by the same reference numerals as those shown in FIG. 3. In FIG.

First, the power input terminal of the WIFI / BT combo chip (IC) 150 can be roughly classified into two types. That is, there is a power input terminal for wire charging and a power input terminal for wireless charging, and the switching between the two power input terminals can have a significant effect on the power efficiency in the wireless power receiver. Therefore, switching between these two power input stages can be performed based on the following table. Table 1 below illustrates the VIO 1.8V power switch table.

From PMIC From wireless power IC Combo Internal Power block Input power source L L COMBO IC OFF L H POWER IC for wireless charging H H FROM WIRELESS POWER IC H L VIO FROM PMIC

Referring to Table 1, when an 'L' signal is input from the PMIC 120 and a 'L' signal is input from the power IC for wireless 130 for wireless charging, The combo IC, that is, the WIFI / BT combo chip (IC) 150, remains off since it represents no input for wireless charging. If the 'H' signal is input from the power IC 130 for wireless charging while the 'L' signal is input from the PMIC 120, it indicates that there is a power input for wireless charging. Therefore, the WIFI / The BT combo chip (IC) 150 receives power from the power IC 130 for wireless charging.

When the 'H' signal is input from the PMIC 120 and the 'H' signal is also input from the wireless charging power IC 130, the power input for wired charging and the power input for wireless charging are simultaneously performed The WIFI / BT combo chip (IC) 150 receives power from the PMIC 120 because it is stable to charge the wired in this case. When the 'H' signal is input from the PMIC 120 and the 'L' signal is also input from the wireless charging power IC 130, it indicates that there is only a power input for wired charging. Therefore, the WIFI / BT combo chip (IC) 150 receives power from the PMIC 120. [

On the other hand, Table 2 illustrates the VBATT power switch table.

From battery 3.3V From Wireless Rechargeable Power IC Combo internal Power block
Input power source L L COMBO IC OFF L H FROM WIRELESS POWER IC H H VBATT FROM BATTERY H L VBATT FROM BATTERY

In Table 2, when the 'H' signal is input from the battery 300 and the 'H' signal is input from the wireless charging power IC 130 and the 'H' signal is input from the battery 300, There is a difference from Table 1 in that the power supply VBATT is input from the battery 300 instead of the PMIC 120 when the 'L' signal is input from the IC 130 as well.

When the 1.8 V power is supplied from the wireless charging power IC 130 to the WIFI / BT combo chip (IC) 150 as described above, the BLE function in the WIFI / BT combo chip (IC) 150 is automatically started do.

Hereinafter, an operation of the wireless power receiver according to the wired and / or wireless charging in the internal circuit configuration of the wireless power receiver will be described.

FIG. 8 is a flowchart illustrating an operation according to a wireless charging input during a wired charging and a wired charging in an off state of a wireless power receiver according to an embodiment of the present invention.

Referring to FIG. 8, when the wireless power receiver is in an off state, when wired power reception is detected in step 1000, power is supplied to all the components including the AP 110 in step 1005. For example, it may be connected to a wired charging terminal using an external device connection such as a charging connection jack of a wireless power receiver. When the wired charger is connected to the wireless power receiver, the IF PMIC 140 senses a wired connection and gives an ON signal to the PMIC 120 in FIG. 5, and supplies VBattery and VPH_PWR Power supply. Then, the PMIC 120 supplies power to the display unit DISPLAY, the clock CLOCK, and the like, including the AP 110, the WIFI / BT combo chip (IC) 150, and the power source for the minimum power mode. At this time, the WIFI / BT combo chip (IC) 150 and the like use 1.8 V CLOCK power supply.

The PMIC 120 then applies a POR_RESET to the AP 110. Then, AP 110 resets the peripheral part while booting (boot up), and initializes GPIO. At this time, if the user presses the hold key to know the state of charge, the AP 110 processes the key input. Accordingly, an icon indicating the state of charge can be displayed on the display unit. At this time, it is preferable that the WIFI / BT combo chip (IC) 150, which is a component for wireless charging, does not operate because wire charging is in progress. Accordingly, if wireless power reception is not detected during wired charging in step 1010, the process returns to step 1000 to determine whether wired power reception is continued. If the wired power reception is interrupted, for example, if the user removes the wired charger from the wireless power receiver, the power supply to all of the systems in the wireless power receiver is interrupted, as in step 1015, and then remains off.

On the other hand, if the wireless power is received in step 1010, for example, if the user places the power receiver on the wireless charging pad with the wired charging terminal connected to the wireless power receiver for charging, V power is applied to the WIFI / BT combo chip (IC) 150. Accordingly, in step 1020, the WFI / BT combo chip (IC) 150 is enabled and booted using the BLE stack in the WIFI / BT combo chip (IC) 150 . At this time, the POWER IC 130 receives the wired input detection signal by the TA-DET pin to know that the wired charging is being performed. Accordingly, the POWER IC 130 sets wired charging to the internal register REGISTER and sends the start signal INT to the MCU 153.

The WIFI / BT combo chip (IC) 150 can determine the status of the POWER IC 130 by I2C communication. In step 1025, the WIFI / BT combo chip (IC)

If the wired charging is disconnected, the charging is performed using the wireless power in step 1030. Specifically, when the connection for wired charging is disconnected, the TA-DET pin of the POWER IC 130 becomes "L", so that the start signal INT is generated. Then, the WIFI / BT combo chip (IC) 150 detects the situation inside the POWER IC 130 and informs it to the wireless power transmitter. Accordingly, the wireless power transmitter increases the power to be sent to the wireless power receiver and then issues a charging command (Charger EN). The WIFI / BT combo chip (IC) 150 of the wireless power receiver then causes the POWER IC 130 to send power to the IF PMIC 140. That is, the power is transmitted to the IF PMIC 140 to charge the battery 300. [

On the other hand, if it is determined in step 1025 that wired power is being received, that is, if it is determined that the WIFI / BT combo chip (IC) 150 is being simultaneously wired / wirelessly charged, the power switch (POWER SW) And communicates with the wireless power transmitter to indicate that the wireless power receiver is charging wired. That is, the first blocking unit 151 can be switched to select the power source from the wired charging. So that the IF PMIC 140 powers all the components in the wireless power receiver, so that wired charging can be performed.

The wireless power transmitter may then output an indication that the wired charging is on the wireless charging pad. The wireless power transmitter can then reduce the power delivered to the wireless power receiver. Alternatively, the wireless power transmitter may wait without transmitting power for a predetermined period of time until wireless charging with the wireless power receiver is resumed.

9 is a flowchart illustrating an operation of the wireless power receiver according to an embodiment of the present invention.

Referring to FIG. 9, if the wireless power receiver is in an off state and wireless power reception is detected in step 1100, a low power short range wireless communication related component, i.e., a WIFI / BT combo chip (IC) 150 is enabled , And booted using the BLE stack. Specifically, when power reception for wireless charging is detected, the POWER IC 130 is supplied with power of 1.8 V to the WIFI / BT combo chip (IC) 150, and the WIFI / BT combo chip (IC) Is self-enabled, running a 37.4Mhz crystal and booting into the BLE stack. At this time, since the 1.8V power from the PMIC 120 is not applied to the VIO of the WIFI / BT combo chip (IC) 150, it is determined that the WIFI / BT combo chip Then, in step 1110, the wireless power transmitter is informed that wireless charging is being performed in the off state.

In response to receiving a charging command from the wireless power transmitter, the WIFI / BT combo chip (IC) 150 performs charging using wireless power in step 1115. [ Specifically, the WIFI / BT combo chip (IC) 150 activates CHARGER_EN to send power to the wireless charging POWER IC 130 to the IF PMIC 140. That is, the power is transmitted to the IF PMIC 140 to charge the battery 300. [ The IF PMIC 140 receiving the power supplies the ON signal to the PMIC 120 and supplies VBattery and VPH_PWR power to the battery and the entire system, respectively. Then, the PMIC 120 starts to operate as the ON signal is transmitted, and supplies power to the AP 110, the WIFI / BT combo chip (IC) 150, a display unit, a clock, and the like.

The AP 110 initializes the GPIO after resetting peripheral ICs preferentially in the boot-up step. The WIFI / BT combo chip (IC) 150 may be reset by a signal such as BT_REG_ON, WL_REG_ON, etc. transmitted from the AP 110. At this time, when the VIO of the WIFI / BT combo chip (IC) 150 receives 1.8 V power from the PMIC 120, the internal SW MUX circuit uses the power of the PMIC 120. Here, even though the signal BT_REG_ON from the AP indicates the "L" state, the WIFI / BT combo chip (IC) 150 operates because of 1.8 V power transmitted from the POWER IC 130.

Then, the WIFI / BT combo chip (IC) 150 determines in step 1120 whether wireless charging is completed. If the wireless charging is completed, the wireless power transmitter is informed of the completion of charging in step 1125. Specifically, when a low current flowing from the POWER IC 130 during the buffering is monitored by the WIFI / BT combo chip (IC) 150, the WIFI / BT combo chip (IC) 150 informs the completion of the charging. The wireless power transmitter can thereby indicate completion of charging on the wireless charging pad.

Meanwhile, an input for wired charging may occur during wireless charging. For example, there may be a case where a user connects a wired charging terminal with the wireless power receiver on the wireless charging pad.

Accordingly, it is determined in step 1120 whether wired power reception during wireless charging is detected before the wireless charging is completed in step 1120. [ If wired power reception is not detected, the process returns to step 1115 to perform wireless charging. On the other hand, when wired power reception is detected, power is supplied to all the components including the AP 110 in step 1135. Specifically, if there is an input for wired charging during wireless charging, wired charging is selected and IF PMIC 140 charges the wireless power receiver using wired charging power.

The WIFI / BT combo chip (IC) 150 is connected to the POWER IC 130 (I2C) by using I2C, and a start signal INT is generated in the TA- ) Can be grasped. That is, referring to Table 1, since the 'H' signal is detected from the POWER IC 130 and the 'H' signal is detected from the PMIC 130 according to the wired connection, the WIFI / BT combo chip The source of the input power within the battery 150 may be determined as a wire charge. Accordingly, the WIFI / BT combo chip (IC) 150 performs charging using the wired power in step 1140 for wired charging, and informs the wireless power transmitter of the wired charging. The WIFI / BT combo chip (IC) 150 may then disable the CHARGER EN of the POWER IC 130.

On the other hand, the wireless power transmitter can output an indication that it is charging the wire over the wireless charging pad. The wireless power transmitter can then reduce the power delivered to the wireless power receiver. The WIFI / BT combo chip (IC) 150 generates a start signal (INT) by detecting an 'L' signal in the TA-DET of the POWER IC 130 when the user stops the wire charging. It can be determined that the event status of the POWER IC 130 indicates that the wired charging has been stopped using I2C. Accordingly, the WIFI / BT combo chip (IC) 150 may request to increase the transmit power again at the wireless power transmitter. That is, when the wired charging is interrupted, the charging is requested to be continued by wireless charging.

In the above description, the WIFI / BT combo chip (IC) 150 operates at all when the wireless power receiver is turned off and the wireless charging, wired charging, input of wired charging during wireless charging, and wireless charging during wired charging occur. Or operates in the SA (Stand Alone) mode because it operates based on the BLE stack from its own internal memory. That is, if there is not enough power to wake up the application processor, or if the power button is not inputted and the OFF state is maintained, the AP 110 can not receive the full stack and can not operate in the NSA mode.

However, when the wireless power receiver is on, wireless charging, wired charging, input of wired charging during wireless charging, and input of wireless charging during wired charging occur, mode switching occurs between SA mode and NSA mode. Accordingly, the WIFI / BT combo chip (IC) 150 may operate based on the BLE stack of the internal memory, or may receive the full stack from the AP 110 and operate based on the received stack.

Hereinafter, the operation of the internal circuit components of the wireless power receiver when the wireless power receiver is on will be described.

10 is a flowchart illustrating an operation of a power receiver according to an embodiment of the present invention in accordance with wireless charging input during wired charging and wired charging in an on state.

Referring to FIG. 10, it is monitored whether the wired power is received in step 1200 in the on state of the wireless power receiver. For example, when a user inserts a wired charging terminal into a charging terminal of a wireless power receiver for wired charging, wired power is received. Specifically, the IF PMIC 140 provides an ON signal to the PMIC 120 and supplies VBattery and VPH_PWR power to the battery and the entire system, respectively. Accordingly, the AP 110 can recognize that the wired connection is being established and display the charging icon. At this time, the AP 110 transmits 'L' signal to the WIFI / BT combo chip (IC) 150 by BT_REG_ON. Then, based on the 'L' signal outputted from the battery 300 through the AP 110 and the 'L' signal indicating that there is no connection for wireless charging from the POWER IC 130 as shown in Table 2, the WIFI / The BT combo chip (IC) 150 will not operate.

When communication with the WIFI / BT combo chip (IC) 150 is required, the AP 110 outputs an 'H' signal by BT_WAKE to wake up a circuit part for performing contactless short-range wireless communication, and outputs 'H' by BT_REG_ON 'Signal to the WIFI / BT combo chip (IC) 150. Then, the WIFI / BT combo chip (IC) 150 starts to operate, thereby transmitting a 'H' signal to the AP 110 by BT_HOST_WAKE and communicating with the AP 110 via a UART. When the WIFI / BT combo chip (IC) 150 wakes up, the AP 110 outputs an 'L' signal by BT_WAKE when it is used in communication with the BT earset and the BT product or when a long time communication failure occurs. The BT combo chip (IC) 150 is switched to the sleep state. At this time, the WIFI / BT combo chip (IC) 150 receives, for example, a BT 4.0 full stack from the AP 110 and loads the RAM into the RAM to perform communication with the wireless power transmitter based on the pool stack.

On the other hand, an input for wireless charging may occur during wired charging. For example, a user may place the wireless power receiver on a wireless charging pad with the wired charging terminal connected to the wireless power receiver.

Therefore, it is determined at step 1210 whether wireless power reception during wired charging is detected before wired charging is completed. If wireless power reception is detected, the IF PMIC 140 charges the wireless power receiver using wired charging power.

At this time, it is determined in step 1215 whether the low-power short-range wireless communication related component, i.e., the WIFI / BT combo chip (IC) That is, the AP 110 determines whether the 'H' signal is transmitted to the WIFI / BT combo chip (IC) 150 by BT_REG_ON.

If the WIFI / BT combo chip (IC) 150 is active, the WIFI / BT combo chip (IC) 150 is already booted up to the full stack, And controls a WIFI / BT combo chip (IC) 150 for communication with an earset, a wireless charging pad, and the like, thereby connecting a communication with an external device. Accordingly, in step 1220, the WIFI / BT combo chip (IC) 150 requests the wireless power transmitter to reduce the output power using the full stack to charge using the wired power.

Specifically, when wireless power is received, 1.8 V / 3.7 V is sent from the POWER IC 130 to the WIFI / BT combo chip (IC) 150, and the 'H' signal is output by the TA- The signal INT is transmitted to the WIFI / BT combo chip (IC) The WIFI / BT combo chip (IC) 150 recognizes the state of the POEWR IC 130 by the I2C when the 1.8V input or the start signal INT is received from the POWER IC 130, do. Accordingly, the WIFI / BT combo chip (IC) 150 requests to adjust the power because it is a simultaneous charging state of wired and wireless when communicating with the wireless power transmitter. In this case, the WIFI / BT combo chip (IC) 150 can communicate with the BT power set as well as the BT earset by using one antenna divided time in the BT / BLE / WIFI simultaneous connection.

However, if the wired power reception is stopped in step 1230, the wireless power transmitter requests the increase of the output power using the full stack in step 1235. Specifically, when the wired charge terminal is pulled out of the wireless power receiver, the POWER IC 130 senses the 'L' signal by the TA-DET pin and sends a start signal INT (1) to the WIFI / BT combo chip ). The WIFI / BT combo chip (IC) 150 may then acknowledge the event condition of the POWER IC 130 with a 1.8V input due to wireless charging and request to increase the transmit power at the wireless power transmitter . In response to this, the WIFI / BT combo chip (IC) 150 enables the BUCK output of the POWER IC 130 to send power to the IF PMIC 140 when the transmit power is increased in the wireless power transmitter, The PMIC 140 charges the battery.

If the WIFI / BT combo chip (IC) 150 is not activated in step 1215, that is, if the AP 110 receives the 'H' signal by the BT_REG_ON in the WIFI / BT combo (IC) 150, the signal by BT_REG_ON is always the 'L' signal.

Accordingly, the WIFI / BT combo chip (IC) 150 senses 1.8 V power corresponding to the wireless charging at the initial stage of receiving power from the POWER IC 130, thereby enabling the WIFI / BT combo chip (IC) 150 to boot up using the BLE stack. Specifically, when the wireless power is received, the POWER IC 130 starts to operate. The POWER IC 130 outputs the 1.8V / 3.7V output, and at the same time, the signal from the TA-DET pin is the 'H' signal And sends a start signal (INT) to the WIFI / BT combo chip (IC) (150). Then, the WIFI / BT combo chip (IC) 150 senses the 1.8V output of the POWER IC 130, boots and operates a 37.4 MHz crystal, and accesses the POWER IC 130 using I2C Identify what the situation is.

Then, the WIFI / BT combo chip (IC) 150 informs the AP 110 that it is wireless charging, and the AP 110 activates the BT function. When the wireless charging is terminated, that is, when the user removes the wireless power receiver from the wireless charging pad, the WIFI / BT combo chip (IC) 150 is disabled. However, if the AP 110 notifies that the WIFI / BT combo chip (IC) 150 is being wirelessly charged, it recognizes that the wired and wireless charging are simultaneously applied, and communicates with the wireless power transmitter, And activates the BT function to request power control. To this end, the AP 110 transmits an 'H' signal to the WIFI / BT combo chip (IC) 150 by BT_REG_ON.

In step 1225, the WIFI / BT combo chip (IC) 150 informs the wireless power transmitter of a reset of the WIFI / BT combo chip (IC) 150 and resumes communication using the full stack. Specifically, since the WIFI / BT combo chip (IC) 150 is to be reset to the wireless power transmitter, it is requested to maintain the power transmission even if there is no communication for a predetermined time, for example, two seconds. In response, a response may be received to maintain power delivery from the wireless power transmitter, and the WIFI / BT combo chip (IC) 150 may take a full stack from the AP 110 after reset, So that wireless charging can be maintained. When the wireless charging is inputted during the wired charging, the AP 110 selects the wired charging but can keep the wireless charging uninterrupted at the same time. However, if the wired power reception is interrupted as in step 1230 after the wireless charging is inputted, it is possible to request the increase of the output power by using the full stack in step 1235.

11 is a flowchart illustrating an operation of wirelessly charging a power receiver in an ON state according to an embodiment of the present invention.

Referring to FIG. 11, it is monitored whether the wireless power is received in step 1300 in the on state of the wireless power receiver. For example, when a user places a wireless power receiver on a wireless charging pad for wireless charging, wireless power may be received. At this time, since the wireless power receiver is on, the WIFI / BT combo chip (IC) 150 receives 1.8 V power from the battery 300 through the PMIC 120.

If wireless power reception is detected, it is determined in step 1305 whether the low power short range wireless communication related component, i.e., the WIFI / BT combo chip (IC) BT combo chip (IC) 150 in step 1310 if the signal from the AP 110 is 'L' signal and 1.8V power is detected from the POWER IC 130. In this case, Self-enable and boot using the BLE stack. The WIFI / BT combo chip (IC) 150 then communicates with the wireless power transmitter and controls the CHARGER_EN of the POWER IC 130 to send power to the IF PMIC 140. Accordingly, the IF PMIC 140 receiving the power transmits the ON signal to the PMIC 120 and performs wireless charging by supplying VBattery and VPH_PWR power to the battery and the entire system, respectively.

In step 1315, the PMIC 120 informs the AP 110 that it is wirelessly charged as the ON signal is transmitted. Then, the AP 110 can recognize that wireless charging is in progress, and transmits an 'H' signal by BT_REG_ON to activate the BT. In response, the WIFI / BT combo chip (IC) 150 informs the wireless power transmitter in step 1320 that it will reset itself. It is responsible for requesting the wireless power transmitter to maintain power even if there is no communication for a preset time, for example 2 seconds, since it will be reset. After the reset, the WIFI / BT combo chip (IC) 150 resumes communication with the wireless power transmitter using the full stack in step 1325, thereby continuing wireless charging in step 1330. In step 1335, it is determined whether wireless charging is completed. To this end, the WIFI / BT combo chip (IC) 150 may monitor whether the current out of the POWER IC 130 is decreasing to determine whether wireless charging is complete. If it is determined that wireless charging has been completed, the WIFI / BT combo chip (IC) 150 informs the wireless power transmitter of the completion of charging in step 1340.

On the other hand, if the signal from BT_REG_ON is 'H' signal from the AP 110 in step 1305, the WIFI / BT combo chip (IC) 150 may be already booted up to the full stack have. Since the wireless power is received in this state, 1.8 V / 3.7 V power is transferred from the POWER IC 130 to the WIFI / BT combo chip (IC) 150. Accordingly, the WIFI / BT combo chip (IC) 150 can recognize the state of the POWER IC 130 as the 1.8 V input or the start signal INT is inputted from the POWER IC 130, .

Therefore, the WIFI / BT combo chip (IC) 150 performs communication with the wireless power transmitter using the full stack in step 1325. Next, the WIFI / BT combo chip (IC) 150 allows the POWER IC 130 to transmit power to the IF PMIC 140 and performs charging using the wireless power as in step 1330.

On the other hand, after informing the wireless power transmitter of the completion of wireless charging, the wireless power transmitter can reduce the power to be sent to the power receiver, or alternatively the wireless power transmitter can signal to end the wireless charging. In this case, the WIFI / BT combo chip (IC) 150 may notify the AP 110 that the power supply by the wireless power transmitter will be cut off with the charging completed.

Meanwhile, FIG. 12 is a flowchart illustrating an operation according to a wired charge input during wireless charging in an on state of a power receiver according to an embodiment of the present invention.

Referring to FIG. 12, the operations in steps 1400 to 1430 are the same as those in steps 1300 to 1330 of FIG. 11, so a detailed description thereof will be omitted. However, it is determined in step 1435 whether the wired power reception is detected during the charging using the wireless power. If wired power reception is detected, charging is performed using wired power in step 1440, and the wireless power transmitter is informed that wired charging is being performed. By doing so, it is possible to request adjustment of the power transmitted from the wireless power transmitter.

In the BT disabled state, that is, when the 'L' signal is transmitted by the BT_REG_ON, the WIFI / BT combo chip (IC) 150 operates as a BLE stack and the 'H' signal from the AP 110 And can be reset and operated using the full stack. Conversely, in the BT activated state, since the signal of BT_REG_ON is 'H' signal from the AP 110, the WIFI / BT combo chip (IC) 150 may be already booted up to the full stack, As shown in FIG.

Claims (15)

An integrated circuit for wireless charging,
A first wireless communication unit for supporting a first wireless communication scheme;
A second wireless communication unit for supporting a second wireless communication scheme,
A first path selector for selecting either one of a first power input according to wire charging and a second power input according to wireless charging to be input;
A second path selector for selecting one of a third power input from the battery and a fourth power input due to wireless charging to be input,
A power control unit receiving power from any one of the first path selection unit and the second path selection unit;
And a controller for controlling operations of the first path selector and the second path selector.
2. The apparatus of claim 1, wherein the first path selector comprises:
Wherein the first power input according to the wired charging is transmitted to the power control unit when the first power input according to the wired charging is under the control of the control unit.
2. The apparatus of claim 1, wherein the first path selector comprises:
Wherein when the first power input according to the wired charging and the second power input according to the wireless charging are both under control of the control unit, the first power input according to the wired charging is transmitted to the power control unit ≪ / RTI >
The apparatus of claim 1, wherein the second path selector comprises:
Wherein when the third power input according to the wired charging and the fourth power input according to the wireless charging are both under control of the control unit, the fourth power input according to the wireless charging is transmitted to the power control unit ≪ / RTI >
2. The apparatus of claim 1, wherein the first path selector and the second path selector comprise:
Wherein the switch is a switch.
2. The method of claim 1, wherein the first power input according to the wired charging and the second power input according to the wireless charging are:
1.8 V power input. ≪ RTI ID = 0.0 > 11. < / RTI >
The apparatus of claim 1, wherein the first wireless communication unit comprises:
(WiFi) communication unit.
The wireless communication system according to claim 1,
A Bluetooth communication unit, and a Bluetooth low energy communication unit.
[2] The method of claim 1, wherein the first power input according to the wired charging and the second power input according to the wireless charging are:
1.8 V power input. ≪ RTI ID = 0.0 > 11. < / RTI >
2. The integrated circuit of claim 1,
Wherein the status of the POWER IC is determined through the I2C and INT interfaces to determine whether the wired charging or the wireless charging is in progress.
A wireless charging method in an integrated circuit for wireless charging,
Determining whether there is at least one power input among a first power input according to wire charging and a second power input according to wireless charging;
Selecting a first power input according to the wired charging when the first power input according to the wired charging and the second power input corresponding to the wireless charging are simultaneously performed;
And performing a wireless network communication or a non-contact short-range wireless communication by receiving a first power input according to the wired charging.
12. The method of claim 11,
And switching the first power input according to the wired charging to be supplied to the integrated circuit.
12. The method of claim 11,
Further comprising the step of selecting a second power input corresponding to the wireless charging when the second power input corresponding to the wireless charging is present.
12. The method of claim 11,
Further comprising the step of determining whether at least one of a third power input from the battery and a fourth power input due to wireless charging is present.
12. The method of claim 11, wherein the wireless network communication is WiFi communication, and the non-contact short range wireless communication is Bluetooth and Bluetooth low energy communication.

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