Charging circuit including switching converter and electronic device including same

Abstract

The charging circuit may include a buck-boost circuit that converts a first input voltage received at a first node to a first output voltage and charges a battery based on the first output voltage; and time-division-convert a second input voltage provided from the battery into a second output voltage provided to the first external device and a third output voltage provided to the second external device, and the voltage regulator circuit regulates the first input voltage to generate the second output voltage and the third output voltage.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on and claims the benefit of priority of Korean Patent Application No. 10-2023-0099001 filed on July 28, 2023, and Korean Patent Application No. 10-2023-0159287 filed on November 16, 2023, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety. Technical Field

[0003] The inventive concept relates to a switching converter, and more particularly, to a charging circuit including a switching converter having a single forward output and a plurality of reverse outputs using a single inductor, and an electronic device including the charging circuit. Background Art

[0004] Mobile electronic devices use rechargeable batteries as power sources to provide the advantage of mobility. The battery capacity of mobile electronic devices is limited, and users must charge the batteries appropriately before the batteries run out. A charger (e.g., a travel adapter) capable of charging the battery converts power supplied from AC 110V~220V, a household power supply, or other power supply device (e.g., a computer) into DC power required for charging the battery, and supplies the DC power to the mobile electronic device. The mobile electronic device can charge the battery using the DC power converted from the charging circuit. In addition, the mobile electronic device can charge other mobile electronic devices using the battery of the mobile electronic device. In order to improve the use time and charging performance of the mobile electronic device, a charging circuit with high (or improved) charging efficiency is necessary (or beneficial). Summary of the invention

[0005] Some example embodiments of the inventive concept provide a charging circuit which generates a single output in a forward direction and a plurality of outputs in a reverse direction using a single inductor and has high charging efficiency.

[0006] Some example embodiments of the inventive concept provide a charging circuit including a buck-boost circuit and a voltage regulator circuit, the buck-boost circuit being configured to convert a first input voltage received at a first node into a first output voltage to charge a battery based on the first output voltage, and time-division-convert a second input voltage provided from the battery into a second output voltage provided to a first external device and a third output voltage provided to a second external device, the voltage regulator circuit being configured to adjust the first input voltage to generate a fourth output voltage and a fifth output voltage. The voltage regulator circuit is configured to provide the fourth output voltage to the first external device and the fifth output voltage to the second external device in response to the charging circuit operating in a first power mode, and the buck-boost converter circuit is configured to provide the second output voltage to the first external device and the third output voltage to the second external device in response to the charging circuit operating in a second power mode.

[0007] Some example embodiments of the inventive concept provide an electronic device including a battery and a charging circuit, the charging circuit being configured to charge at least one of the battery and a plurality of external devices based on a first input voltage received from an external part, and the charging circuit being further configured to charge the plurality of external devices based on a second input voltage from the battery, wherein the charging circuit includes a switching converter circuit configured to generate a plurality of output voltages using a single inductor, converting the first input voltage into a first output voltage provided to the battery in a first power mode, and converting the second input voltage from the battery into a second output voltage and a third output voltage provided to each of a first external device and a second external device, respectively, in a second power mode, and a voltage regulator circuit configured to adjust the first input voltage in the first power mode to generate a fourth output voltage and a fifth output voltage. The voltage regulator circuit is configured to provide the fourth output voltage and the fifth output voltage to the second external device in response to the charging circuit operating in the first power mode.

[0008] Some example embodiments of the inventive concept provide a method for operating an electronic device, the electronic device including a battery and a charging circuit for charging the battery, the method including: detecting whether there is external input power received from the outside, operating in a first power mode based on the external input power when the external input power is provided, and operating in a second power mode based on internal input power provided from the battery when the external input power is not provided, wherein, in the first power mode, a buck-boost converter circuit provided in the charging circuit is configured to generate a first output voltage provided to the battery based on the external input power, and a voltage regulator circuit provided in the charging circuit is configured to generate a fourth output voltage and a fifth output voltage provided to a first external device and a second external device, respectively, based on the external input power, and wherein, in the second power mode, the buck-boost converter circuit is configured to generate a second output voltage and a third output voltage based on the internal input power. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Some example embodiments of the inventive concept will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0010] Figure 1 A charging circuit and an electronic device including the charging circuit according to example embodiments are shown;

[0011] Figure 2 is a block diagram illustrating a charging circuit according to an example embodiment;

[0012] Figure 3 is a circuit diagram showing a charging circuit according to an example embodiment;

[0013] Figure 4 A charging circuit according to an example embodiment operating in a first power mode is shown;

[0014] Figure 5A and Figure 5B The forward buck-boost operation of the switching converter is shown;

[0015] Figure 6 is a timing diagram of a control signal and an inductor current when the switching converter performs a forward buck-boost operation;

[0016] Figure 7 shows a charging circuit according to an example embodiment operating in a second power mode;

[0017] Fig. 8A , Figure 8B and Figure 8C shows the reverse buck-boost operation of the switching converter;

[0018] Fig. 9is a timing diagram of a control signal and an inductor current when the switching converter performs a forward buck-boost operation;

[0019] Fig.10 is a circuit diagram showing a charging circuit according to an example embodiment;

[0020] Fig.11 is a circuit diagram showing a charging circuit according to an example embodiment;

[0021] Fig.12 is a circuit diagram showing a charging circuit according to an example embodiment;

[0022] Fig.13 A charging circuit and an electronic device including the charging circuit according to an example embodiment are shown;

[0023] Fig.14 is a circuit diagram showing a charging circuit according to an example embodiment;

[0024] Fig.15 is a flow chart illustrating a method of operating an electronic device including a charging circuit according to an example embodiment;

[0025] Fig.16 is a block diagram illustrating an electronic device according to an example embodiment; and

[0026] Fig.17 is a diagram illustrating an electronic system according to example embodiments. DETAILED DESCRIPTION

[0027] Hereinafter, some example embodiments of the inventive concept are described in detail with reference to the accompanying drawings.

[0028] Figure 1 A charging circuit and an electronic device including the charging circuit according to an example embodiment are shown. Figure 1 , a first mobile device 21 and a second mobile device 22 connected to the electronic device 10 are shown together.

[0029] Reference Figure 1 , the electronic device 10 may include a charging circuit 100, a battery 200, and a power interface 300. In addition, the electronic device 10 may also include general components such as a processor, a communication circuit, and a display.

[0030] In some example embodiments, the electronic device 10 may be a mobile device. For example, the electronic device 10 may be a charging box or a charging stand. However, the electronic device 10 is not limited thereto, and the electronic device 10 may be one of various devices including the battery 200 or having a removable battery, such as a smart phone, a tablet personal computer, a laptop personal computer, or a wearable device.

[0031] The charging circuit 100 according to some example embodiments may charge the battery 200, and may also charge external devices such as the first mobile device 21 and the second mobile device 22. The charging circuit 100 may also provide a system voltage utilized within the electronic device 10.

[0032] In some example embodiments, the first mobile device 21 and the second mobile device 22 may be wireless headphones or earbuds. For example, the first mobile device 21 may be a left earbud in a pair of earbuds, and the second mobile device 22 may be a right earbud in a pair of earbuds. However, the first mobile device 21 and the second mobile device 22 are not limited thereto, and the first mobile device 21 and the second mobile device 22 may be one of various devices equipped with a battery, such as a wearable device (such as smart glasses, a smart watch, and a smart bracelet), a mobile medical device, and a camera, but example embodiments are not limited thereto.

[0033] In some example embodiments, when power is supplied from an external device (eg, an electronic device ( Figure 1 When the charging circuit 100 receives external power (e.g., an external power supply voltage) from the electronic device 10) or the first mobile device 21 and the second mobile device 22, the charging circuit 100 may operate in a first power supply mode (also referred to as an external power supply mode). In the first power supply mode, the charging circuit 100 may charge the battery 200 and / or the first mobile device 21 and the second mobile device 22 based on an external power source. For example, the charging circuit 100 may perform a step-down of the external power supply voltage to generate a charging voltage provided to the battery 200, e.g., a first output voltage. The first output voltage may be provided to other components within the electronic device 10 as well as the battery 200.

[0034] The charging circuit 100 may also perform a step-down of the external power supply voltage in the first power mode to generate charging voltages, such as a second output voltage and a third output voltage (or alternatively referred to as a fourth output voltage and a fifth output voltage), which are respectively provided to the first mobile device 21 and the second mobile device 22. The first mobile device 21 and the second mobile device 22 may be connected to the electronic device 10 through the first output terminal T1 and the second output terminal T2, respectively. The second output voltage and the third output voltage (or the fourth output voltage and the fifth output voltage) may be provided to the first mobile device 21 and the second mobile device 22 through the first output terminal T1 and the second output terminal T2, respectively. In an example embodiment, the first output terminal T1 and the second output terminal T2 may be implemented with a pogo pin.

[0035] Hereinafter, the charging circuit 100 is described as an example of generating charging voltages such as the second output voltage and the third output voltage (or the fourth output voltage and the fifth output voltage, respectively) respectively provided to the first mobile device 21 and the second mobile device 22. However, the charging circuit 100 is not limited thereto, and may generate three or more charging voltages respectively provided to three or more mobile devices.

[0036] In some example embodiments, when no external power is received from an external device, the charging circuit 100 may operate in a second power mode (or referred to as an internal power mode). In the second power mode, the charging circuit 100 may charge the first mobile device 21 and the second mobile device 22 based on the internal power (e.g., the internal power supply voltage) provided from the battery 200. For example, the charging circuit 100 may perform a step-down (step-down) or step-up (step-up) of the internal power supply voltage to generate a second output voltage and a third output voltage provided to the first mobile device 21 and the second mobile device 22, respectively.

[0037] In some example embodiments, the charging circuit 100 may include a switching converter having multiple outputs with a single inductor (eg, Figure 2 110), as referenced below Figures 2 to 13 The switching converter 110 may generate a first output voltage provided to the battery 200 by performing a buck-boost operation on the external power supply voltage in a first direction (e.g., a forward direction) based on the external power supply voltage in the first power mode, and may perform a buck-boost operation on the internal power supply voltage in a second direction (e.g., a reverse direction) based on the internal power supply voltage provided from the battery 200 in the second power mode to generate a second output voltage and a third output voltage provided to the first mobile device 21 and the second mobile device 22, respectively. In this specification, the first direction (e.g., the forward direction) refers to a direction in which a current of an inductor provided in the charging circuit 100 flows toward the battery 200, and the second direction (e.g., the reverse direction) refers to a direction in which a current output from the battery 200 flows into the inductor.

[0038] The charging circuit 100 can use a single inductor (eg, Figure 3The inductor L in the charging circuit 100 generates the second output voltage and the third output voltage in a time-division manner. Therefore, the charging circuit 100 can independently control (or can control) the first mobile device 21 and the second mobile device 22 regardless of the voltage level of the internal power supply voltage provided from the battery 200. For example, the charging circuit 100 can generate different second and third output voltages, and charge the first mobile device 21 and the second mobile device 22 based on the different second and third output voltages. Therefore, the charging efficiency of the charging circuit 100 can be improved while minimizing (or reducing) the increase in the bill of materials (BOM). Refer to the following Figures 2 to 14 The configuration and operation of the charging circuit 100 are described in detail.

[0039] The charging circuit 100 may be referred to as a “charging integrated circuit”, “battery charger” or “power management integrated circuit (PMIC)”. The charging circuit 100 may be implemented in various forms and, for example, may be implemented with one or more semiconductor devices (or semiconductor chips, semiconductor packages, etc.). According to some example embodiments, the charging circuit 100 may include a voltage regulator ( Figure 2 120) and switching converters ( Figure 2 110), and when the charging circuit 100 is implemented as a semiconductor chip, the voltage regulator ( Figure 2 120) and switching converters ( Figure 2 Various circuits included in 110) can be formed on one (or the same) semiconductor substrate. In addition, the various circuits included in the voltage regulator ( Figure 2 120) and switching converters ( Figure 2 The circuit in 110) can be formed on the same semiconductor substrate using the same semiconductor process.

[0040] In some example embodiments, the charging circuit 100 may be mounted on a board (e.g., a printed circuit board) within the electronic device 10. One or more circuit elements related to a charging operation (such as an inductor and a capacitor) are provided on the board, and the charging circuit 100 may be connected to the one or more circuit elements.

[0041] In some example embodiments, the charging circuit 100 may be formed of a semiconductor chip on which some or all circuits are formed and passive elements (eg, inductors) that may be placed on a board in the electronic device 10 and electrically connected to each other.

[0042] The battery 200 may be built into the electronic device 10, or may be removed from the electronic device 10. In some example embodiments, the battery 200 may include a plurality of battery devices (or a plurality of battery cells), and the plurality of battery devices may be connected in series or in parallel. In an example embodiment, the battery 200 may be implemented with a battery pack.

[0043] The power interface 300 may receive external power from an external device. The power interface 300 may include a wired power receiving circuit and / or a wireless power receiving circuit. For example, the wired power receiving circuit and / or the wireless power receiving circuit may include a rectifier, a regulator, and the like.

[0044] For example, the power interface 300 may be implemented as a wired power interface and may receive external power from a travel adapter (TA) or an auxiliary battery device. The TA may convert power supplied from AC 110V to 220V (which is a household power source or another power supply device (e.g., a computer)) into DC power required (or used) for charging the battery 200, and may provide the DC power to the electronic device 10.

[0045] For example, the power interface 300 may be implemented as a wireless power interface, and may convert a signal received from a wireless power transmitting device (eg, a wireless charging pad) into a specific voltage, for example, an external power supply voltage.

[0046] Figure 2 is a block diagram illustrating a charging circuit according to example embodiments.

[0047] exist Figure 2 , a battery 200, a first mobile device 21, and a second mobile device 22 connected to the charging circuit 100a are shown together. The charging circuit 100a can be applied to Figure 1 The charging circuit 100, therefore, refers to Figure 1 The description of the charging circuit 100 can be applied to Figure 2 The charging circuit 100a.

[0048] Reference Figure 2 , the charging circuit 100a may include a switching converter 110 (or a switching converter circuit), a voltage regulator 120 (or a voltage regulator circuit). In some example embodiments, the charging circuit 100a may also include a sensing circuit and an input circuit. In some example embodiments, the charging circuit 100a may also include a control circuit (e.g., Fig.12 of 150).

[0049] The switching converter 110 can charge the battery 200 based on the first input voltage VIN1 in the first power mode, and can charge the battery 200 based on the second input voltage (eg, VIN1) provided from the battery 200 in the second power mode. Figure 7 The first input voltage VIN1 is an external power supply voltage provided from an external device, and the second input voltage VIN2 may be an internal power supply voltage provided from the battery 200, for example, a battery voltage VBAT.

[0050] Switching converter 110 may operate in a first power mode and a second power mode. In an example embodiment, switching converter 110 may be implemented with a DC-DC converter, such as a buck-boost converter. In an example embodiment, switching converter 110 may include a single inductor and may use the single inductor to perform a buck-boost operation on an input voltage to generate multiple output voltages.

[0051] Switching converter 110 generates a first output voltage by stepping down or stepping up a first input voltage VIN1 using a single inductor in a first power mode, and provides the first output voltage to battery 200. Therefore, battery 200 may be charged, and battery voltage VBAT may increase to the first output voltage.

[0052] The switching converter 110 can generate the second output voltage and the third output voltage in a time-division manner by stepping down or stepping up the second input voltage provided from the battery 200 using a single inductor in the second power mode, and can respectively provide the second output voltage and the third output voltage to the first mobile device 21 and the second mobile device 22. Therefore, the switching converter 110 can independently control the charging of the first mobile device 21 and the charging of the second mobile device 22.

[0053] For example, a voltage higher than the second input voltage (e.g., battery voltage) may be required (or used or beneficial) to charge the first mobile device 21, and a voltage lower than the second input voltage may be required (or used or beneficial) to charge the second mobile device 22. The switching converter 110 may boost the second input voltage to generate a second output voltage higher than the second input voltage, and provide the second output voltage to the first mobile device 21. The switching converter 110 may perform a step-down of the second input voltage to generate a third output voltage lower than the second input voltage, and provide the third output voltage to the second mobile device 22.

[0054] The voltage regulator 120 may be operated in the first power mode and may be blocked from operating in the second power mode. The voltage regulator 120 generates a second output voltage and a third output voltage (or a fourth output voltage and a fifth output voltage) by stepping down (or adjusting) the first input voltage VIN1, and may provide the second output voltage and the third output voltage (or the fourth output voltage and the fifth output voltage) to the first mobile device 21 and the second mobile device 22, respectively. In an example embodiment, the voltage regulator 120 may be implemented with a low drop-output (LDO). In the second power mode, no external power is received from the outside, and the switching converter 110 provides the second output voltage and the third output voltage (or the fourth output voltage and the fifth output voltage) to the first mobile device 21 and the second mobile device 22, respectively, so that the voltage regulator 120 does not operate.

[0055] Figure 3 is a circuit diagram illustrating a charging circuit according to an example embodiment.

[0056] refer to Figure 3 The charging circuit 100 a includes a switching converter 110 and a voltage regulator 120 . Figure 3 The charging circuit 100a can be applied to Figure 1 The charging circuit 100, and Figure 1 The charging circuit 100 and Figure 2 The description of the charging circuit 100a can be applied to Figure 3 The charging circuit 100a.

[0057] The switching converter 110 may include an inductor L and a plurality of switching elements, for example, a first transistor Q1 to a sixth transistor Q6. The switching converter 110 may be implemented with a buck-boost circuit. The first to sixth transistors may be implemented with a P-channel metal oxide semiconductor field effect transistor (MOSFET) or an N-channel MOSFET. However, the switching converter 110 is not limited thereto, and the plurality of switching elements may be implemented as a complementary metal oxide semiconductor (CMOS) transistor or a transmission gate.

[0058] The first transistor Q1 may be connected between the first node N1 and the second node N2 receiving the first input voltage VIN1, and may be turned on or off in response to the first control signal CS1. The second transistor Q2 may be connected between the second node N2 and the seventh node N7, and may be turned on or off in response to the second control signal CS2. A power supply voltage (e.g., a ground voltage) may be applied to the seventh node N7. The inductor L may be connected between the second node N2 and the third node N3. The third transistor Q1 may be connected between the third node N3 and the fourth node N4, and may be turned on or off in response to the third control signal CS3. The fourth transistor Q4 may be connected between the third node N3 and the seventh node N7. The fifth transistor Q5 may be connected between the second node N2 and the fifth node N5, and may be turned on or off in response to the fifth control signal CS5. The sixth transistor Q6 may be connected between the second node N2 and the sixth node N56, and may be turned on or off in response to the sixth control signal CS6.

[0059] The voltage regulator 120 may include two power transmission elements, for example, a seventh transistor Q7 and an eighth transistor Q8. The seventh transistor Q7 and the eighth transistor Q8 may be implemented with a P-channel MOSFET or an N-channel MOSFET. The seventh transistor Q7 and the eighth transistor Q8 may each operate as an LDO regulator. The seventh transistor Q7 and the eighth transistor Q8 may operate in response to a seventh control signal CS7 and an eighth control signal CS8, respectively.

[0060] In addition, the charging circuit 100a may further include a control circuit (eg, Fig.12 150), and the control circuit can provide control signals, for example, first to sixth control signals CS1 to CS6, to the switching converter 110, and provide seventh and eighth control signals CS7 and CS8 to the voltage regulator 120.

[0061] The first mobile device 21 and the second mobile device 22 may each include a battery (e.g., a first battery BAT1 and a second battery BAT2) and a charging circuit CC. The charging circuit CC provided in the first mobile device 21 and the second mobile device 22 may charge the battery based on the voltage and current provided from the charging circuit 100a, for example, the battery may be charged using a constant current-constant voltage method.

[0062] Figure 4 A charging circuit according to an example embodiment operating in a first power mode is shown.

[0063] Reference Figure 4 , when external power (eg, the first input voltage VIN1 ) is applied from the outside, the charging circuit 100 a may operate in the first power mode.

[0064] The first to fourth transistors Q1 to Q4 provided in the switching converter 110 may perform switching operations in response to the first to fourth control signals CS1 to CS4, thereby forming a first power path PP1 for supplying power from the first input voltage VIN1 to the battery 200. In the first power mode, the fifth transistor Q5 and the sixth transistor Q6 may be turned off.

[0065] The switching converter 110 can provide external power to the battery 200 through the first power path PP1. Through the switching operation of the first transistor Q1 to the fourth transistor Q4, the switching converter 110 can perform a forward buck-boost operation. In some example embodiments, when the forward buck-boost operation is performed, the inductor current IL flowing through the inductor L can flow from the second node N2 to the third node N3. The switching converter 110 can generate a first output voltage VO1 by bucking or boosting the first input voltage VIN1. The on time and off time of the first transistor Q1 to the fourth transistor Q4, such as the duty cycle of the switching converter 110, can be adjusted so that a first output voltage VO1 having a target level is generated. The first output voltage VO1 can be provided to the battery 200, or provided to the electronic device ( Figure 1 10) of the internal system. FIG. 5A to FIG. 6 The forward buck-boost operation of the switching converter 110 in the first power mode is described in detail.

[0066] In the first power mode, the seventh transistor Q7 and the eighth transistor Q8 provided in the voltage regulator 120 can be turned on, respectively, to form a second power path PP2 and a third power path PP3, which respectively provide power from the first input voltage VIN1 to the first mobile device 21 and the second mobile device 22.

[0067] The seventh transistor Q7 and the eighth transistor Q8 can generate the fourth output voltage VO4 and the fifth output voltage VO5 by stepping down the first input voltage VIN1 in response to the seventh control signal CS7 and the eighth control signal CS8. The seventh transistor Q7 and the eighth transistor Q8 can be controlled according to the seventh control signal CS7 and the eighth control signal CS8 so that the fourth output voltage VO4 and the fifth output voltage VO5 have target levels, respectively.

[0068] Figure 5A and Figure 5B shows the forward buck-boost operation of the switching converter, and Figure 6 is a timing diagram of the control signal and the inductor current when the switching converter performs forward buck-boost operation.

[0069] Figure 5A The first phase PH1 of the forward buck-boost operation is shown. Figure 6 , the switching converter 110 may perform a forward buck-boost operation having a cycle, and one cycle T may include a first phase PH1 and a second phase PH2 .

[0070] In the first phase PH1, the first transistor Q1 and the fourth transistor Q4 may be turned on in response to the first control signal CS1 and the fourth control signal CS4 at an activation level (e.g., logic high), respectively. The second transistor Q2 and the third transistor Q3 may be turned off in response to the second control signal CS2 and the third control signal CS3 at an inactive level (e.g., logic low), respectively. The first input voltage VIN1 may be provided to the inductor L. The inductor current IL increases the first input voltage VIN1, and the inductor L may be charged.

[0071] refer to Figure 5B and Figure 6 In the second phase PH2, the first transistor Q1 and the fourth transistor Q4 may be turned off in response to the first control signal CS1 and the fourth control signal CS4 at an inactive level (e.g., logic low), respectively. The second transistor Q2 and the third transistor Q3 may be turned on in response to the second control signal CS2 and the third control signal CS3 at an active level (e.g., logic high), respectively. The inductor current IL decreases, and the inductor L may be discharged. The energy charged in the inductor L may be transferred to the battery 200 to charge the battery 200. In some example embodiments, when the inductor current IL becomes 0A, the second transistor Q2 and the third transistor Q3 may be turned off in response to the second control signal CS2 and the third control signal CS3, respectively.

[0072] Figure 7 A charging circuit according to an example embodiment operating in a second power mode is shown.

[0073] refer to Figure 7 , when the external power source (eg, the first input voltage VIN1) is not applied to the charging circuit 100a, the charging circuit 100a may operate in the second power mode.

[0074] In the second power mode, the voltage regulator 120 does not operate. The seventh transistor Q7 and the eighth transistor Q8 may be turned off in response to the seventh control signal CS7 and the eighth control signal CS8, respectively.

[0075] The second to sixth transistors Q2 to Q6 provided in the switching converter 110 perform switching operations in response to the second to sixth control signals CS2 to CS6, thereby forming a fourth power path PP4 and a fifth power path PP5 for respectively supplying power from the battery 200 to the first mobile device 21 and the second mobile device 22. In the second power mode, the first transistor Q1 may be turned off.

[0076] Through the switching operation of the first transistor Q1 to the sixth transistor Q6, the switching converter 110 can perform a reverse buck-boost operation. In some example embodiments, when the reverse buck-boost operation is performed, the inductor current IL flowing through the inductor L can flow from the third node N3 to the second node N2. The switching converter 110 can buck or boost the second input voltage VIN2 provided from the battery 200 to generate a second output voltage VO2 and a third output voltage VO3, respectively. The on-time and off-time of the second transistor Q2 to the sixth transistor Q6, such as the duty cycle of the switching converter, can be adjusted so that the second output voltage VO2 and the third output voltage VO3 having a target level are generated. Refer to the following FIG. 8A to FIG. 9 The reverse buck-boost operation of the switching converter 110 in the second power mode is described in detail.

[0077] Fig. 8A , Figure 8B and Figure 8C shows the reverse buck-boost operation of the switching converter, and Fig. 9 is a timing diagram of the control signal and the inductor current when the switching converter performs forward buck-boost operation.

[0078] Reference FIG. 8A to FIG. 9 , the switching converter 110 may perform a reverse buck-boost operation having a period T including a first period P1 and a second period P2, and the first period P1 and the second period P2 may be repeated alternately. The length of the first period P1 may be the same as the length of the second period P2. In the first period P1, the switching converter 110 may perform a reverse buck-boost operation to generate a second output voltage VO2, and in the second period, the switching converter 110 may perform a reverse buck-boost operation to generate a third output voltage VO3.

[0079] Fig. 8AThe first phase PH1 and the third phase PH3 of the reverse buck-boost operation are shown. In the first phase PH1, the second transistor Q2 and the third transistor Q3 may be turned on in response to the second control signal CS2 and the third control signal CS3 at an activation level (e.g., logic high). The fourth transistor Q4 to the sixth transistor Q6 may be turned off in response to the fourth control signal CS4 to the sixth control signal CS6 at an inactive level (e.g., logic low). The second input voltage VIN2 may be provided to the inductor L. The inductor current IL increases the second input voltage VIN2, and the inductor L may be charged.

[0080] Figure 8B The second phase PH2 of the reverse buck-boost operation is shown. In the second phase PH2, the second transistor Q2 and the third transistor Q3 may be turned off in response to the second control signal CS2 and the third control signal CS3 at an inactive level (e.g., logic low), and the sixth transistor Q6 may be turned off in response to the sixth control signal CS6 at an inactive level. The fourth transistor Q4 and the fifth transistor Q5 may be turned on in response to the fourth control signal CS4 and the fifth control signal CS5 at an active level (e.g., logic high). The inductor current IL decreases, and the inductor L may be discharged. The energy charged in the inductor L is transferred to the first mobile device 21, and the battery (e.g., the first battery BAT1) of the first mobile device 21 may be charged. In some example embodiments, when the inductor current IL becomes 0A, the fourth transistor Q4 and the fifth transistor Q5 may be turned off in response to the fourth control signal CS4 and the fifth control signal CS5.

[0081] Afterwards, as referenced Fig. 8A As described, in the third phase PH3 , the inductor L may be recharged by the second input voltage VIN2 .

[0082] Figure 8CThe fourth phase PH4 of the reverse buck-boost operation is shown. In the fourth phase PH4, the second transistor Q2 and the third transistor Q3 may be turned off in response to the second control signal CS2 and the third control signal CS3 at the inactive level, and the fifth transistor Q5 may be turned off in response to the fifth control signal CS5 at the inactive level. The fourth transistor Q4 and the sixth transistor Q6 may be turned on in response to the fourth control signal CS4 and the sixth control signal CS6 at the active level (e.g., logic high). The inductor current IL decreases, and the inductor L may be discharged. The energy charged in the inductor L is transferred to the second mobile device 22, and the battery (e.g., the second battery BAT2) of the second mobile device 22 may be charged. In some example embodiments, when the inductor current IL becomes 0A, the fourth transistor Q4 and the sixth transistor Q6 may be turned off in response to the fourth control signal CS4 and the sixth control signal CS6.

[0083] In addition, in order to generate the second output voltage VO2 and the third output voltage VO3 having the target level, the on-time and off-time of the second transistor Q2 to the sixth transistor Q6, for example, the duty cycle of the switching converter 110 can be adjusted. For example, the length of the first phase PH1 (for example, the on-time) and the length of the first phase PH2 (for example, the off-time) within the first period P1 can be adjusted so that the second output voltage VO2 reaches and maintains the target level. In addition, the length of the third phase PH3 (for example, the on-time) and the length of the fourth phase PH4 (for example, the off-time) within the second period P2 can be adjusted so that the third output voltage VO3 reaches and maintains the target level. For example, the voltage levels of the second output voltage VO2 and the third output voltage VO3 can be sensed, and the on-time and off-time of the second control signal CS2 to the sixth control signal CS6 can be adjusted based on the sensed voltage levels.

[0084] In an example embodiment, the duty cycle of the switching converter 110 may be adjusted so that the current (e.g., load current) provided to the first mobile device 21 and the second mobile device 22 has a target level. For example, the length of the on-time period within the first period P1 may be adjusted so that the average value of the load current provided to the first mobile device 21 has a target level, and the length of the on-time within the second period P2 may be adjusted so that the average value of the load current provided to the second mobile device 22 has a target level. For example, the first load current provided to the first mobile device 21 and the second load current provided to the second mobile device 22 are sensed respectively, and the on-time and off-time of the second control signal CS2 to the sixth control signal CS6 may be adjusted based on the average value of the first load current and the average value of the second load current within a predetermined period.

[0085] Thus, in the second power mode, the switching converter 110 performs a reverse buck-boost operation, thereby generating the second output voltage VO2 and the third output voltage VO3 in a time-division manner, and also independently generating the second output voltage VO2 and the third output voltage VO3. The switching converter 110 can generate two output voltages using one inductor L, thereby minimizing (or reducing) the electronic device ( Figure 1 In addition, since the second output voltage VO2 and the third output voltage VO3 are generated by the switching converter 110 and provided to the first mobile device 21 and the second mobile device 22 without passing through the voltage regulator 120, the charging efficiency of the charging circuit 100a in the second power mode can be improved.

[0086] In the case where the battery of the first mobile device 21 (such as the first battery BAT1) is kept fully charged and the battery of the second mobile device 22 (such as the second battery BAT2) is repeatedly charged and discharged, when the switching converter 110 does not independently generate the second output voltage VO2 and the third output voltage VO3 through the buck-boost operation in the second power mode, but boosts the second input voltage from the battery 200 through the boost operation and adjusts the boosted voltage to generate the second output voltage VO2 and the third output voltage VO3, the energy of the battery 200 may be wasted due to the boosting and bucking to generate the second output voltage VO2 and the third output voltage VO3, rather than being consumed for charging the first mobile device 21 and the second mobile device 22. Therefore, the number of times the first mobile device 21 and the second mobile device 22 are charged based on the energy charged in the battery 200 may be reduced.

[0087] However, as described above, in the charging circuits 100 and 100a according to the example embodiments, in the second power mode, because the switching converter 110 independently generates the second output voltage VO2 and the third output voltage VO3, energy waste in the battery 200 is reduced, and the number of times the first mobile device 21 and the second mobile device 22 are charged is increased due to the reduction in energy waste in the battery 200.

[0088] Fig.10 is a circuit diagram illustrating a charging circuit according to an example embodiment.

[0089] Fig.10 The charging circuit 100b is Figure 3 The charging circuit 100a is modified and can be applied as Figure 1 Therefore, the above description of the charging circuit 100 and the charging circuit 100a may be applied to some example embodiments, and the description already given is omitted.

[0090] Reference Fig.10 , the charging circuit 100b may include a switching converter 110, a voltage regulator 120, and a current sensing circuit 130. Figure 3 Compared with the charging circuit 100 a , the charging circuit 100 b may further include a current sensing circuit 130 .

[0091] The current sensing circuit 130 may include a ninth transistor Q9 connected between the fifth node N5 and the first output terminal T1 and a tenth transistor Q10 connected between the sixth node N6 and the second output terminal T2. The ninth transistor Q9 and the tenth transistor Q10 may be implemented with N-channel MOSFETs or P-channel MOSFETs.

[0092] The ninth transistor Q9 can provide the second output voltage VO2 (or the fourth output voltage VO4) output from the voltage regulator 120 in the first power mode or the second output voltage VO2 output from the switching converter 110 in the second power mode to the first output terminal T1, and can sense the current flowing through the first output terminal T1, for example, the first load current IP1.

[0093] The tenth transistor Q10 can provide the third output voltage VO3 (or the fifth output voltage VO5) output from the voltage regulator 120 in the first power mode or the third output voltage VO3 output from the switching converter 110 in the second power mode to the second output terminal T2, and can sense the current flowing through the second output terminal T2, for example, the second load current IP2.

[0094] In an example embodiment, the ninth transistor Q9 and the tenth transistor Q10 can sense the first load current IP1 and the second load current IP2 using a current mirror method. For example, the voltage of the gate terminal of the ninth transistor Q9 and the tenth transistor Q10 is provided to a mirror circuit so that the first load current IP1 and the second load current IP2 can be sensed.

[0095] In an example embodiment, the ninth transistor Q9 and the tenth transistor Q10 may operate as a voltage regulator (e.g., LDO). The ninth transistor Q9 may adjust the received second output voltage VO2 (or the fourth output voltage VO4) and provide the adjusted voltage to the first mobile device 21. The tenth transistor Q10 may adjust the received third output voltage VO3 (or the fifth output voltage VO5) and provide the adjusted voltage to the second mobile device 22.

[0096] Fig.11 is a circuit diagram illustrating a charging circuit according to an example embodiment.

[0097] Fig.11 The charging circuit 100c is Fig.10A modified example of the charging circuit 100b, and can be applied as Figure 1 Therefore, the charging circuit ( Figure 1 100 out of 100 Figure 3 100a and Fig.10 The description of 100b) in FIG. 100a may be applied to some example embodiments, and the description already given is omitted.

[0098] Reference Fig.11 The charging circuit 100 c may include a switching converter 110 c , a voltage regulator 120 , and a current sensing circuit 130 .

[0099] The switching converter 110c may include first to sixth transistors Q1 to Q6 and an eleventh transistor Q11. Fig.10 Compared with the switching converter 110 of FIG. 1 , the switching converter 110d may further include an eleventh transistor Q11. The eleventh transistor Q11 may be implemented with an N-channel MOSFET or a P-channel MOSFET. In an example embodiment, the eleventh transistor Q11 may be replaced with a transmission gate.

[0100] The eleventh transistor Q11 may be turned on and off based on the eleventh control signal CS11. The eleventh transistor Q11 may connect the battery 200 to the switching converter 110a or disconnect the battery 200 from the switching converter 110a. The eleventh transistor Q11 is turned on in the first power mode to connect the battery 200 to the switching converter 110a, and after the battery 200 is fully charged, the eleventh transistor Q11 is turned off to electrically isolate the battery 200 from the switching converter 110a.

[0101] Fig.12 is a circuit diagram illustrating a charging circuit according to an example embodiment.

[0102] Fig.12 The charging circuit 100d is Fig.11 A modified example of the charging circuit 100c and can be applied as Figure 1 Therefore, the charging circuit 100 of the electronic device 10 is omitted. Fig.12 The description of the charging circuit 100d given overlaps the description.

[0103] Fig.12 The charging circuit 100 d may include a switching converter 110 c , a voltage regulator 120 , a current sensing circuit 130 , a sensing circuit 140 , and a control circuit 150 .

[0104] The sensing circuit 140 may sense various voltages VSEN and currents ISEN within the charging circuit 100d. For example, the sensing circuit 140 may sense the inductor current flowing in the inductor L. In an example embodiment, the sensing circuit 140 is connected to the current sensing circuit 130 and may sense the load current provided to the first mobile device 21 and the second mobile device 22. For example, the sensing circuit 140 may include a mirror circuit that mirrors the current flowing through the ninth transistor Q9 and the tenth transistor Q10.

[0105] The sensing circuit 140 may sense the voltages of some nodes of the charging circuit 100d. For example, the sensing circuit 140 may detect the level of the first output voltage by sensing the voltage of the fourth node N4. In addition, the sensing circuit 140 may determine whether the battery 200 is fully charged. The sensing circuit 140 may detect the levels of the second output voltage and the third output voltage (or the levels of the fourth output voltage and the fifth output voltage) by sensing the voltages of the fifth node N5 and the sixth node N6.

[0106] The control circuit 150 may generate control signals of the charging circuit 100d, for example, first to eleventh control signals CS1 to CS11. In an example embodiment, the control circuit 150 may generate the first to eleventh control signals CS1 to CS11 based on the voltage and current sensing results of the sensing circuit 140. For example, in the second power mode, when the second output voltage and the third output voltage generated and output by the switching converter 110c do not reach the target level, the control circuit 150 may adjust the on-time and off-time (for example, the time with the active level and the inactive level) of the second to sixth signals CS2 to CS6 to increase the duty cycle.

[0107] Fig.13 A charging circuit and an electronic device including the charging circuit according to an example embodiment are shown. Fig.13 , a first mobile device 21 and a second mobile device 22 connected to the electronic device 10a are shown together.

[0108] Reference Fig.13 , the electronic device 10 e may include a charging circuit 100 e , a battery 200 , a wired power interface 310 , and a wireless power interface 320 .

[0109] The wired power interface 310 may include a wired power receiving circuit. In an example embodiment, the wired power interface 310 may be implemented with a connector. As a non-limiting example, the wired power interface 310 may be implemented with a universal serial bus (USB) connector. The wired power interface 310 may receive a first external voltage CHGIN from a TA or an auxiliary battery device and provide the first external voltage CHGIN to the charging circuit 100e.

[0110] The wireless power interface 320 may include a wireless power receiving circuit. The wireless power interface 320 may convert a signal received from a wireless power transmitting device (eg, a wireless charging pad) into a second external voltage WCIN and provide the second external voltage WCIN to the charging circuit 100e.

[0111] When receiving the first external voltage CHGIN or the second external voltage WCIN, the charging circuit 100e can operate in the first power mode. As described above, the charging circuit 100e can charge the battery 200 and / or the first and second mobile devices 21 and 22 based on the first external voltage CHGIN or the second external voltage WCIN.

[0112] Fig.14 is a circuit diagram illustrating a charging circuit according to an example embodiment.

[0113] Fig.14 The charging circuit 100e can be provided to Fig.13 An electronic device 10e. Fig.14 The charging circuit 100e is Figure 3 A modified example of the charging circuit 100a, and can be applied as Figure 1 The charging circuit 100 of the electronic device 10. The description of the charging circuits 100, 100a, 100b, 100c, and 100d according to the above-described various exemplary embodiments may be applied to some embodiments and the description already given may be omitted.

[0114] Reference Fig.14 , the charging circuit 100e may include a switching converter 110c, a voltage regulator 120, a current sensing circuit 130, and an input selection circuit 160. Fig.14 , the charging circuit 100e is shown to include a reference Fig.11 The switching converter 100c described above is not limited thereto. The charging circuit 100e may include another switching converter (eg, Figure 3 110 in the above table).

[0115] The input selection circuit 160 may provide the first external voltage CHGIN or the second external voltage WCIN as the first input voltage VIN1 to the first node N1. The input selection circuit 160 may include a first input transistor QI1 and a second input transistor QI2, and the first input transistor QI1 and the second input transistor QI2 may be turned on or off in response to the first input control signal ICS1 and the second input control signal ICS2. The first input transistor QI1 and the second input transistor QI2 may be implemented with a P-channel MOSFET or an N-channel MOSFET. However, the input selection circuit 160 is not limited thereto, and the first input transistor QI1 and the second input transistor QI2 may be replaced with a CMOS transistor or a transmission gate.

[0116] In the first power mode, the first input transistor Q11 and the second input transistor Q12 may selectively or simultaneously provide the first external voltage CHGIN and / or the second external voltage WCIN as the first input voltage VIN1 to the first node N1 .

[0117] In the second power mode, the first input transistor QI1 and the second input transistor QI2 may be turned off. In an example embodiment, even if the first external voltage CHGIN and / or the second external voltage WCIN are received from an external power device, the charging device 100e may selectively (by a user or an electronic device ( Fig.13 10a) of the system selection) operates in the second power supply mode, and the first input transistor QI1 and the second input transistor QI2 can be turned off.

[0118] Fig.15 is a flow chart illustrating a method of operating an electronic device including a charging circuit according to an example embodiment.

[0119] Fig.15 The method of operating an electronic device in Figure 1 The electronic device 10 and Fig.13 The electronic device 10e performs the Figure 1 Describe the operation Fig.15 The above description of the electronic devices 10 and 10e and the charging circuit 100 can be applied to this embodiment.

[0120] Reference Fig.15In operation S110, the electronic device 10 may determine whether there is an external input power source, for example, an external input voltage. For example, the power interface 300 may detect whether the external input power is received, and based on the detection result, the electronic device 10 may determine whether there is external input power. In an example embodiment, the electronic device 10 may include a processor that controls the overall operation of the electronic device 10, and the processor may generate a mode signal that determines the operation mode of the charging circuit 100 based on the external input power detection result.

[0121] In operation S120, when external input power is present, the charging circuit 100 may operate in a first power mode (eg, external power mode). The charging circuit 100 may operate in the first power mode based on a mode signal from a processor.

[0122] The charging circuit 100 may include a switching converter ( Figure 2 110) and the voltage regulator ( Figure 2 120), and in operation S121, the switch converter ( Figure 2 The switching converter 110 may charge the battery 200 based on the external input power. The switching converter 110 may perform step-up or step-down of the external input voltage to generate a first output voltage, and provide the first output voltage to the battery 200, thereby charging the battery 200.

[0123] The voltage regulator 120 may provide a voltage regulator to a first external device (such as Figure 1 A first mobile device 21 and a second external device (such as Figure 1 The voltage regulator 120 may perform a step-down of the external input voltage to generate a second output voltage and a third output voltage (or a fourth output voltage and a fifth output voltage), and provide the second output voltage and the third output voltage to the first external device and the second external device, respectively (or provide the fourth output voltage and the fifth output voltage).

[0124] In some example embodiments, operation S121 and operation S122 may be performed simultaneously. In example embodiments, operation S121 and operation S122 may be performed at different times. As an example, operation S122 may be performed before operation S121. For example, when the first external device and the second external device are charged to above a predetermined reference value based on operation S122, operation S121 may be performed. As an example, when the first external device and the second external device are not electrically connected to the charging circuit 100, operation S122 may not be performed and operation S121 may be performed.

[0125] In operation S130, when there is no external input power, the charging circuit 100 may operate in the second power mode (eg, internal power mode). The charging circuit 100 may operate in the first power mode based on a mode signal from the processor.

[0126] The switching converter 110 may charge the first external device and the second external device based on the internal input voltage from the battery 200. As described above, the switching converter 110 may include a single inductor, and may perform a buck-boost operation on the input voltage based on a switching operation of a switching element using the single inductor, thereby generating a second output voltage provided to the first external device and a third output voltage provided to the second external device in a time-division manner.

[0127] Fig.16 is a block diagram illustrating an electronic device according to an example embodiment.

[0128] Reference Fig.16 , the electronic device 1000 may include a processor 1100 , a PMIC 1200 , a power interface 1300 , a battery 1400 , a communication circuit 1500 , and a display 1600 .

[0129] The processor 1100 may control the overall operation of the electronic device 1000. The processor 1100 may include a micro control unit (MCU). However, the processor 1100 is not limited thereto and may include a processor such as a central processing unit (CPU).

[0130] The processor 110 may control the display 1600 to perform a display operation of displaying the charge amount of the battery 1400 , the state of the electronic device 1000 , and the like.

[0131] The PMIC 1200 may include a charging circuit according to the above-described embodiments (such as Figure 1 100 in the first power mode). The PMIC 1200 may charge the battery 1400 and / or the first mobile device 1010 and the second mobile device 1020 using external power received through the power interface 1300 in the first power mode. In addition, the PMIC 1200 may charge the first mobile device 1010 and the second mobile device 1020 using internal power provided from the battery 1400 in the second power mode.

[0132] In an example embodiment, the power interface 1300 may detect whether external power is applied and provide the detection result to the processor 1100. The processor 1100 may provide a mode decision signal based on the detection result to the PMIC 1200. The PMIC 1200 may set the first power mode or the second power mode based on the mode decision signal.

[0133] Fig.17is a diagram illustrating an electronic system according to example embodiments.

[0134] Reference Fig.17 , the electronic system 2000 may include an electronic device 2100 , a first mobile device 2210 and a second mobile device 2220 , and a power transmission device 2300 .

[0135] In some example embodiments, the first mobile device 2210 and the second mobile device 2220 may be wireless headphones or earbuds. The first mobile device 2210 and the second mobile device 2220 may be accommodated in the electronic device 100 and charged.

[0136] The electronic device 2100 may be charged by receiving power from an external source, and the first mobile device 2210 and the second mobile device 2220 may be charged based on the charged power. The electronic device 100 may be a charging case or a charging stand for the first mobile device 2210 and the second mobile device 2220. The electronic device 2100 may accommodate the first mobile device 2210 and the second mobile device 2220 and charge the first mobile device 2210 and the second mobile device 2220. The electronic device 2100 and the first mobile device 2210 and the second mobile device 2220 may be directly connected by wires, for example, by spring pins, and the first mobile device 2210 and the second mobile device 2220 may be detached from the electronic device 2100. In an example embodiment, the electronic device 2100 and the first mobile device 2210 and the second mobile device 2220 are capable of wired and wireless communication, and the states of the first mobile device 2210 and the second mobile device 2220 may be provided to the electronic device 2100 by wired or wireless communication. In an example embodiment, the firmware included in the electronic device 2100 may be updated by wired or wireless communication with at least one of the first mobile device 2210 and the second mobile device 2220.

[0137] The above can be provided Figure 1 The electronic device 100 and Fig.13 The electronic device 100e is used as the electronic device 2100. The electronic device 2100 may include a battery ( Figure 1 200) and / or a charging circuit ( Figure 1 100 in the figure). The charging circuit 100 may include a switching converter ( Figure 2 110) and a voltage regulator including a single inductor ( Figure 2120 in). In the second power mode based on the internal power operation from the battery 200, the switching converter 110 can generate the second output voltage and the third output voltage in a time-division manner using a single inductor, and provide the second output voltage and the third output voltage to the first mobile device 2210 and the second mobile device 2220, respectively. Since the switching converter 110 generates the second output voltage and the third output voltage independently, the charging efficiency can be improved. In addition, since the switching converter 110 generates the second output voltage and the third output voltage using a single inductor, the increase in the BOM of the electronic device 2100 can be minimized (or reduced).

[0138] The power transmission device 2300 may be a wireless charging pad. The power transmission device 2300 may be connected to an external power source and provide power to the electronic device 2100. The power transmission device 2300 may convert the external power into an electrical signal and provide the converted electrical signal to the electronic device 2100. In an exemplary embodiment, the power transmission device 2300 may be a TA or an auxiliary battery.

[0139] One or more of the elements disclosed above may include or be implemented in a processing circuit, such as hardware including logic circuits; a hardware / software combination, such as a processor that executes software; or a combination thereof. For example, the processing circuit may more specifically include, but is not limited to, a central processing unit (CPU), an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), a system on a chip (SoC), a programmable logic unit, a microprocessor, an application specific integrated circuit (ASIC), etc.

[0140] While the inventive concept has been particularly shown and described with reference to embodiments thereof, it will be understood that various changes in form and details may be made therein without departing from the spirit and scope of the appended claims.

Claims

1. A charging circuit, comprising: Buck-boost converter circuit, configured as: converting a first input voltage received at a first node into a first output voltage to charge a battery based on the first output voltage, and time-division converting a second input voltage provided by the battery into a second output voltage provided to a first external device and a third output voltage provided to a second external device; as well as a voltage regulator circuit configured to adjust the first input voltage to generate a fourth output voltage and a fifth output voltage, wherein the voltage regulator is configured to provide the fourth output voltage to the first external device and the fifth output voltage to the second external device in response to the charging circuit operating in the first power mode, and The buck-boost converter circuit is configured to provide the second output voltage to the first external device and the third output voltage to the second external device in response to the charging circuit operating in the second power mode.

2. The charging circuit according to claim 1, wherein: The buck-boost converter circuit comprises: Inductors; and A plurality of switching elements are configured to control a current flowing in the inductor.

3. The charging circuit according to claim 2, wherein: The plurality of switch elements include: a first transistor connected between the first node and a second node, a first terminal of the inductor being connected to the second node; a second transistor connected between the second node and a seventh node; a third transistor connected between a third node and a fourth node, the second terminal of the inductor being connected to the fourth node, and the third transistor being configured to output the first charging voltage to the fourth node or to receive the second input voltage from the fourth node; a fourth transistor connected between the third node and the seventh node; a fifth transistor connected between the second node and a fifth node, and the fifth transistor is configured to output the second output voltage to the fifth node; and A sixth transistor is connected between the second node and a sixth node, and the sixth transistor is configured to output the third output voltage to the sixth node.

4. The charging circuit according to claim 1, wherein: The buck-boost converter circuit is configured as: in response to receiving the first input voltage from an external power source, converting the first input voltage to the first output voltage, and In response to blocking the first input voltage from being received from the external power source, the second input voltage provided from the battery is converted into the second output voltage and the third output voltage.

5. The charging circuit according to claim 1, wherein: The buck-boost converter circuit is configured as: The second output voltage is generated in a first period and the third output voltage is generated in a second period continuous with the first period, wherein the first period and the second period alternate and a length of the first period is equal to a length of the second period.

6. The charging circuit according to claim 1, wherein: The voltage regulator circuit comprises: a seventh transistor connected between the first node and the fifth node; and An eighth transistor is connected between the first node and the sixth node.

7. The charging circuit according to claim 6, in, The seventh transistor is configured to generate the fourth output voltage by stepping down the first input voltage, and the seventh transistor is further configured to output the fourth output voltage to the fifth node, and The eighth transistor is configured to generate the fifth output voltage by stepping down the first input voltage, and the eighth transistor is further configured to output the fifth output voltage to the sixth node.

8. The charging circuit according to claim 6, in, The seventh transistor and the eighth transistor are configured to be turned on in response to receiving the first input voltage from an external power source, and The seventh transistor and the eighth transistor are configured to be turned off in response to reception of the first input voltage from the external power source being blocked.

9. The charging circuit according to claim 1, further comprising: a ninth transistor configured to provide the second output voltage or the fourth output voltage to the first output terminal, and the ninth transistor is further configured to sense a current flowing through the first output terminal; as well as The tenth transistor is configured to provide the third output voltage or the fifth output voltage to the second output terminal, and the tenth transistor is further configured to sense a current flowing through the second output terminal.

10. The charging circuit according to claim 1, further comprising: a first input transistor configured to provide a first external voltage received from a first external power source through a wired connection as the first input voltage; as well as The input selection circuit includes a second input transistor configured to provide a second external voltage received from a second external power source through a wireless connection as the second input voltage.

11. An electronic device, comprising: Battery; as well as a charging circuit configured to charge at least one of the battery and a plurality of external devices based on a first input voltage received from the outside, and the charging circuit is further configured to charge the plurality of external devices based on a second input voltage from the battery, Wherein, the charging circuit comprises: The switching converter circuit is configured as: Generate multiple output voltages using a single inductor, converting the first input voltage into a first output voltage provided to the battery in a first power mode, and in a second power mode, converting the second input voltage from the battery into a second output voltage and a third output voltage provided to each of a first external device and a second external device, respectively; and a voltage regulator circuit configured to adjust the first input voltage to generate a fourth output voltage and a fifth output voltage in the first power mode, and The voltage regulator is configured to provide the fourth output voltage to the first external device and the fifth output voltage to the second external device in response to the charging circuit operating in the first power mode.

12. The electronic device according to claim 11, wherein: The switching converter circuit comprises: Inductors; and a plurality of switching elements configured to control a current flowing in the inductor, wherein, in the second power mode, the inductor and the plurality of switching elements are configured to perform a buck-boost operation to generate the second output voltage in a first period and to generate the third output voltage in a second period continuous with the first period, and The first time period is the same as the second time period.

13. The electronic device according to claim 12, wherein: The plurality of switch elements include: a first transistor connected between a first node and a second node, the first terminal of the inductor being connected to the second node; a second transistor connected between the second node and a seventh node; a third transistor connected between a third node and a fourth node, the second terminal of the inductor being connected to the third node, and the third transistor being configured to output the first charging voltage to the fourth node or receive the second input voltage from the fourth node; a fourth transistor connected between the third node and the seventh node; a fifth transistor connected between the second node and a fifth node, and the fifth transistor is configured to output the second output voltage to the fifth node; and A sixth transistor is connected between the second node and a sixth node, and the sixth transistor is configured to output the third output voltage to the sixth node.

14. The electronic device according to claim 13, wherein: The voltage regulator circuit comprises: a seventh transistor connected between the first node and the fifth node; and An eighth transistor is connected between the first node and the sixth node.

15. The electronic device according to claim 14, wherein: The eighth transistor is configured as: generating the fourth output voltage by stepping down the first input voltage, and outputting the fourth output voltage to the fifth node, and The fifth output voltage is generated by stepping down the first input voltage, and is output to the sixth node.

16. The electronic device according to claim 11, further comprising: A processor is configured to generate a mode signal indicating one of the first power mode and the second power mode based on whether the first input voltage is received from the outside, and the processor is also configured to provide the mode signal to the charging circuit. 17 . The electronic device according to claim 11 , further comprising a power interface configured to receive the first input voltage from an external source.

18. The electronic device according to claim 17, wherein: The power interface comprises: a wired power interface including a wired power receiving circuit; and A wireless power interface includes a wireless power receiving circuit.

19. The electronic device according to claim 11, in, The first external device and the second external device each include a wireless headset, and Wherein, the electronic device includes a charging box for the wireless headset.

20. A method of operating an electronic device, the electronic device comprising a battery and a charging circuit for charging the battery, the method comprising: detecting the presence or absence of external input power received from the outside; when the external input power is provided, operating in a first power mode based on the external input power; as well as operating in a second power mode based on internal input power supplied from the battery when the external input power is not supplied, wherein, in the first power mode, the buck-boost converter circuit provided in the charging circuit is configured to generate a first output voltage provided to the battery based on the external input power, and the voltage regulator circuit provided in the charging circuit is configured to generate a fourth output voltage and a fifth output voltage provided to a first external device and a second external device, respectively, based on the external input power, and Wherein, in the second power mode, the buck-boost converter circuit is configured to generate a second output voltage and a third output voltage based on the internal input power.

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