Charging circuit, electronic device, and accessory device

Abstract

A charging circuit, an electronic device and an accessory device relate to the technical field of charging circuits. The charging circuit comprises a battery module, a first input-output interface, a second input-output interface, a power management circuit and a first charging branch. The first input-output interface and the second input-output interface are connected in parallel to the power supply end of the power management circuit and the input end of the first charging branch. The battery voltage end of the power management circuit and the output end of the first charging branch are connected to the battery module. When the first input-output interface inputs a first charging signal, the first adapter voltage input by the first input-output interface is converted into a first charging voltage by the first charging branch to charge the battery module. When the second input-output interface inputs a second charging signal, the second adapter voltage input by the second input-output interface is converted into the first charging voltage by the first charging branch to charge the battery module.

Description

Technical Field

[0001] This disclosure relates to the field of charging circuit technology, and more specifically, to a charging circuit, electronic device, and accessory device. Background Technology

[0002] Electronic devices and accessory devices typically have battery modules for energy storage and input / output ports. In related technologies, the battery module can be charged via these input / output ports. With technological advancements, devices may have multiple input / output ports to accommodate a wide variety of external devices.

[0003] However, a problem arose where charging became inconvenient when some of the device's input / output ports were occupied. Utility Model Content

[0004] This disclosure provides a charging circuit, electronic device, and accessory device, which improves the convenience of charging and enhances the user experience.

[0005] According to one aspect of this disclosure, a charging circuit is provided, comprising: a battery module, a first input / output interface, a second input / output interface, a power management circuit, and a first charging branch, wherein:

[0006] After the first input / output interface and the second input / output interface are connected in parallel, they are connected to the power supply terminal of the power management circuit and the input terminal of the first charging branch. The battery voltage terminal of the power management circuit and the output terminal of the first charging branch are connected to the battery module.

[0007] When a first charging signal is input to the first input / output interface, the first adapter voltage input to the first input / output interface is converted into a first charging voltage through the first charging branch to charge the battery module; when a second charging signal is input to the second input / output interface, the second adapter voltage input to the second input / output interface is converted into a first charging voltage through the first charging branch to charge the battery module.

[0008] In one exemplary embodiment of this disclosure, the input voltage of the first charging branch is a first preset voltage, and the input voltage of the power management circuit is a second preset voltage, wherein the first preset voltage is higher than the second preset voltage.

[0009] In one exemplary embodiment of this disclosure, the charging circuit further includes a bidirectional charge pump circuit, which is connected between the battery voltage terminal of the power management circuit and the battery module.

[0010] The bidirectional charge pump circuit is used at least to boost the third preset voltage output from the power management circuit to the bidirectional charge pump circuit to the first charging voltage.

[0011] In one exemplary embodiment of this disclosure, the first charging branch in the first operating mode reduces the first preset voltage to the first charging voltage to charge the battery module; in the second operating mode, the first charging branch uses the first preset voltage to charge the battery module.

[0012] In one exemplary embodiment of this disclosure, the first input / output interface is a contact interface, and the second input / output interface is a plug-in interface.

[0013] In one exemplary embodiment of this disclosure, the first input / output interface is a POGO pin interface.

[0014] In one exemplary embodiment of this disclosure, the charging circuit further includes a boost circuit, the input terminal of which is connected to the voltage output terminal of the power management circuit, and the output terminal of which is connected to the first input / output interface. When the charging circuit is in a first power supply mode, the boost circuit converts the voltage input to the boost circuit into a power supply voltage to power the first input / output interface.

[0015] In one exemplary embodiment of this disclosure, the charging circuit further includes a buck-boost circuit. The first input / output interface is connected to the output of the buck-boost circuit, and the input of the buck-boost circuit is connected to the battery module. When the charging circuit is in a first power supply mode, the buck-boost circuit converts the voltage input to the buck-boost circuit into a power supply voltage to power the first input / output interface.

[0016] In one exemplary embodiment of this disclosure, the power management circuit supplies power to the second input / output interface in response to the charging circuit being in a second power supply mode.

[0017] In one exemplary embodiment of this disclosure, a first on / off switch is provided between the first input / output interface and the power supply terminal of the power management circuit; when the charging circuit is in the first power supply mode, the first on / off switch is turned off.

[0018] In one exemplary embodiment of this disclosure, the charging circuit includes a first overvoltage protection circuit; the input terminal of the first overvoltage protection circuit is connected to a first input / output interface and a second input / output interface, and the output terminal of the first overvoltage protection circuit is connected to the power supply terminal of the power management circuit.

[0019] In one exemplary embodiment of this disclosure, the charging circuit includes a second overvoltage protection circuit; the input terminal of the second overvoltage protection circuit is connected to the output terminal of the boost circuit, and the output terminal of the second overvoltage protection circuit is connected to the first input / output interface.

[0020] In one exemplary embodiment of this disclosure, the charging circuit includes a second overvoltage protection circuit; the input terminal of the second overvoltage protection circuit is connected to the output terminal of the buck-boost circuit, and the output terminal of the second overvoltage protection circuit is connected to the first input / output interface.

[0021] According to another aspect of this disclosure, an electronic device is provided, including the charging circuit of any of the foregoing.

[0022] According to another aspect of this disclosure, an accessory device is provided, including the charging circuit of any of the foregoing.

[0023] The charging circuit, electronic device, and accessory device disclosed herein have a first input / output interface and a second input / output interface both connected to the input terminal of a first charging branch. The charging circuit can charge the battery module in response to a first charging signal input from the first input / output interface or a second charging signal input from the second input / output interface. When a charger is connected to the first input / output interface, the battery module can be charged through the first charging branch; when a charger is connected to the second input / output interface, the battery module can also be charged through the first charging branch. This allows either the first or second input / output interface to be used simultaneously. For example, when an external device is connected, charging can be performed through the other input / output interface, thereby improving the convenience of device charging and enhancing the user experience.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0026] Figure 1 This is a structural block diagram of an exemplary embodiment of the charging circuit disclosed herein.

[0027] Figure 2 This is a schematic diagram of the circuit architecture of an exemplary embodiment of the charging circuit of this disclosure.

[0028] Figure 3 A schematic diagram of the circuit architecture for another exemplary embodiment of the charging circuit of this disclosure.

[0029] Figure 4 This is a block diagram illustrating an exemplary embodiment of the electronic device disclosed herein. Detailed Implementation

[0030] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0031] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising” and “having” are used to indicate an open-ended inclusion and to mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.

[0032] It should be understood that although this disclosure may use terms such as first, second, etc., to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and are not intended to limit the quantity, importance, or order of their objects. For example, without departing from the scope of this disclosure, a first mode may also be referred to as a second mode, and similarly, a second mode may also be referred to as a first mode. Depending on the context, “in…” can be interpreted as “when…”, “if…”, or “in response to determination.”

[0033] In the following description, suffixes such as "module" or "unit" used to denote elements are used only for the purposes of this disclosure and have no specific meaning in themselves. Therefore, "module" or "unit" can be used interchangeably.

[0034] This disclosure provides a charging circuit that can be applied to electronic devices, accessory devices, etc. The charging circuit includes a battery module 40, a first input / output interface 11, a second input / output interface 12, a power management circuit 20, and a first charging branch 30, wherein:

[0035] After the first input / output interface 11 and the second input / output interface 12 are connected in parallel, they are connected to the power supply terminal of the power management circuit 20 and the input terminal of the first charging branch 30. The battery voltage terminal of the power management circuit 20 and the output terminal of the first charging branch 30 are connected to the battery module 40.

[0036] When a first charging signal is input to the first input / output interface 11, the first adapter voltage input to the first input / output interface 11 is converted into a first charging voltage through the first charging branch 30 to charge the battery module 40; when a second charging signal is input to the second input / output interface 12, the second adapter voltage input to the second input / output interface 12 is converted into a first charging voltage through the first charging branch 30 to charge the battery module 40.

[0037] refer to Figure 1 As shown, both the first input / output interface 11 and the second input / output interface 12 are connected to the input terminal of the first charging branch 30. The charging circuit can enter the first charging mode in response to the first charging signal input from the first input / output interface 11 or the second charging signal input from the second input / output interface 12. In the first charging mode, the battery module 40 is charged through the first charging branch 30. When a charger is connected to the first input / output interface 11, the battery module 40 can be charged through the first charging branch 30; when a charger is connected to the second input / output interface 12, the battery module 40 can also be charged through the first charging branch 30. Thus, either the first input / output interface 11 or the second input / output interface 12 can be occupied. For example, when an external device is connected, charging can be performed through the other input / output interface, thereby improving the convenience of device charging and enhancing the product user experience.

[0038] Furthermore, in some potential application scenarios, due to environmental limitations, electronic devices can only be charged through either the first input / output interface 11 or the second input / output interface 12. The charging circuit provided in this disclosure can multiplex the first charging branch 30 in the charging links of the first input / output interface 11 and the second input / output interface 12, thereby improving the device's charging capability while also helping to control costs.

[0039] For example, the first input / output interface 11 and the second input / output interface 12 can be different types of interfaces. The first input / output interface can be a contact interface. For example, the first input / output interface 11 can include a needle shaft, a spring, and a needle tube, achieving stable contact through spring pressure and elastic connection based on spring contact; the first input / output interface 11 can also include a magnetic element, achieving rapid alignment of interface pins through magnetic attraction. The second input / output interface 12 can be a pluggable interface, achieving interface matching and connection of contacts within the interface through a physical pluggable structure.

[0040] Specifically, the first input / output interface 11 can be a POGO pin connector. Taking the charging circuit applied to an electronic device such as a tablet computer as an example, the tablet computer has a POGO pin interface (first input / output interface 11); the external device is a car tablet computer holder, which also has a POGO pin interface corresponding to the first input / output interface 11. The tablet computer and the holder are connected through the POGO pin, so that the holder can charge the tablet computer through the first input / output interface 11.

[0041] In some scenarios, tablets have large screens and loud speakers, resulting in high discharge power during use. Even when mounted in a car using a stand, the discharge power may approach or even exceed the charging power, leading to issues such as the battery not increasing while using the device, or even decreasing during charging. The charging circuit disclosed herein enables fast charging via the POGO pin interface, helping to reduce users' battery anxiety.

[0042] For example, the second input / output interface 12 can be a Lightning Dock interface, a Micro USB interface based on Universal Serial Bus (USB), a USB Type-C interface, etc. The second input / output interface 12 can also be connected to a charger to charge the battery module 40. For example, taking the second input / output interface 12 as a Type-C interface, the device battery module 40 can be charged through the Type-C interface and the first charging branch 30.

[0043] In one exemplary embodiment of this disclosure, the input voltage of the first charging branch 30 is a first preset voltage, and the input voltage of the power management circuit 20 is a second preset voltage. The first preset voltage is higher than the second preset voltage, thereby realizing different charging modes of the charging circuit. The charging modes may be, for example, a first charging mode and a second charging mode, wherein the first charging mode is a fast charging mode, and the second charging mode is a normal charging mode.

[0044] In some exemplary embodiments of this disclosure, the power management circuit 20 may include a power management integrated circuit (PMIC). The control terminal of the PMIC may be connected to a processor to receive control signals from the processor. In one example, in a scenario where the battery module 40 is being charged, the charging circuit can select a suitable charging mode for the battery module 40 based on its battery voltage, making the charging process more intelligent and improving safety. For example, if the charging voltage is higher than the voltage required by the battery module 40, overcharging may occur, creating safety hazards or even causing an explosion. Therefore, a normal charging mode can be selected. If the charging voltage is lower than the voltage required by the battery module 40, low temperature phenomena may occur, affecting the lifespan of the battery module 40. Therefore, a fast charging mode can be selected.

[0045] In some implementations, a suitable charging mode can be selected based on the stage of the charging process of the battery module 40. For example, the charging process of the battery module 40 is divided into four stages: trickle charging, pre-charging, constant current charging, and constant voltage charging. For instance, when the charging process of the battery module 40 is in the trickle charging, pre-charging, or constant voltage charging stages, the charging circuit operates in the second charging mode, charging the battery module 40 through the power management circuit 20; when the charging process of the battery module 40 is in the constant current charging stage, the charging circuit operates in the first charging mode, charging the battery module 40 through the first charging branch 30.

[0046] In one exemplary embodiment of this disclosure, the input terminal VBUS2 of the first charging branch 30 is connected to the first input / output interface 11 and the second input / output interface 12, and the output terminal VBAT4 of the first charging branch 30 is connected to the battery module 40. The first charging branch 30 may include a fast charging chip based on a charge pump circuit, and the control terminal of the fast charging chip may be connected to a processor for charging the battery module 40 in a first charging mode.

[0047] The first charging branch 30 can have a first operating mode. In the first operating mode, the first charging branch 30 can step down the first preset voltage input to the power management circuit 20 to a first charging voltage to charge the battery module. For example, the voltage ratio of the input voltage to the output voltage of the first charging branch 30 can be 4:2, which can reduce the input voltage of the battery module 40 by 50% while increasing the input current by 100%, achieving high-power charging. For instance, the first preset voltage can be 20V, and the battery module 40 consists of two series-connected individual batteries. The first charging branch 30 can step down the 20V voltage to 10V to charge the two series-connected individual batteries, effectively improving the charging speed of the battery module 40.

[0048] The first charging branch 30 may have a second operating mode. In the second operating mode, the first charging branch 30 can charge the battery module 40 using a first preset voltage. For example, if the first preset voltage and the voltage of the battery module 40 meet specific requirements, the first charging branch 30 can directly charge the battery module 40 using the first preset voltage. For instance, the first preset voltage may be 20V, and the battery module 40 consists of four individual batteries connected in series. The first charging branch 30 can use the first preset voltage to charge the battery module 40, achieving a high-voltage charging effect and effectively improving the charging speed of the battery module 40.

[0049] In one exemplary embodiment of this disclosure, reference is made to Figure 2 As shown, the charging circuit also includes a bidirectional charge pump circuit 51, which is connected between the battery voltage terminal VBAT1 of the power management circuit 20 and the battery module 40. The bidirectional charge pump circuit 51 has two operating modes: boost mode and buck mode. When the charging circuit is in the second charging mode, the bidirectional charge pump circuit 51 operates in boost mode. The power supply terminal VBUS1 of the power management circuit 20 receives a second preset voltage, adjusts the second preset voltage to a third preset voltage, and outputs it to the bidirectional charge pump circuit 51. The bidirectional charge pump circuit 51 boosts the third preset voltage to the first charging voltage to charge the battery module 40.

[0050] Specifically, the first terminal VBAT2 of the bidirectional charge pump circuit 51 is connected to the battery voltage terminal VBAT1 of the PMIC, and the second terminal VBAT3 of the bidirectional charge pump circuit 51 is connected to the battery module 40. When the charging circuit is in the second charging mode, the bidirectional charge pump circuit 51 operates in boost mode, and can boost the received third preset voltage according to the voltage of the battery module 40 before transmitting it to the battery module 40.

[0051] The battery module 40 can power the first input / output interface 11. Exemplarily, the charging circuit also includes a boost circuit 52. (See reference...) Figure 2 As shown, the input terminal Vin1 of the boost circuit 52 is connected to the voltage output terminal VPH of the power management circuit 20, and the output terminal Vout1 of the boost circuit 52 is connected to the first input / output interface 11. In response to the charging circuit being in the first power supply mode, the boost circuit 52 converts the voltage input to the boost circuit 52 into the power supply voltage to power the first input / output interface 11.

[0052] For example, the boost circuit 52 may include a boost chip to perform DC-DC conversion. For example, when the charging circuit is in the first power supply mode, the bidirectional charge pump circuit 51 can operate in buck mode, stepping down the input voltage of the battery module 40 to the battery voltage terminal VBAT1 of the power management circuit 20, and the boost chip boosts the voltage input to the voltage output terminal VPH of the power management circuit 20 to provide power supply voltage for the first input / output interface 11.

[0053] For example, the charging circuit includes a second overvoltage protection circuit 62; the input terminal Vin2 of the second overvoltage protection circuit 62 is connected to the output terminal Vout1 of the boost circuit 52, and the output terminal Vout2 of the second overvoltage protection circuit 62 is connected to the first input / output interface 11.

[0054] Specifically, the second overvoltage protection circuit 62 can be used to compare the voltage output by the boost circuit 52 with the first voltage limit. If the voltage output by the boost circuit 52 is less than or equal to the first voltage limit, the second overvoltage protection circuit 62 is in an unprotected state, allowing the voltage output by the boost circuit 52 to flow to the first input / output interface 11. If the voltage output by the boost circuit 52 is greater than the first voltage limit, the second overvoltage protection circuit 62 is in a protected state, prohibiting the voltage output by the boost circuit 52 from flowing to the first input / output interface 11. This avoids damage to peripherals connected to the first input / output interface 11 by high-voltage power supply signals, providing overvoltage protection for the first input / output interface 11.

[0055] In one exemplary embodiment of this disclosure, the charging circuit further includes a buck-boost circuit 53. (See reference...) Figure 3 As shown, the first input / output interface 11 is connected to the output of the buck-boost circuit 53, and the input of the buck-boost circuit 53 is connected to the battery module 40. In response to the charging circuit being in the first power supply mode, the buck-boost circuit 53 converts the voltage input to the buck-boost circuit 53 into the power supply voltage to power the first input / output interface 11.

[0056] For example, the buck-boost circuit 53 may include a buck or boost chip to perform DC-DC boost or buck conversion. For example, the buck or boost chip boosts the voltage input to the battery module 40 to provide a voltage higher than that of the battery module 40 to the first input / output interface 11.

[0057] For example, the battery module 40 includes individual cells connected in series. Taking the battery module 40 as an example, which includes two 4V cells connected in series, the buck or boost chip can draw 8V power from the battery module 40 and perform boost conversion to output an 11V power supply voltage. This provides high voltage power supply to the first input / output interface 11, which helps to improve power supply efficiency and reduce product heat generation.

[0058] For example, the buck or boost chip can step down the voltage input to the battery module 40 to provide a voltage lower than that of the battery module 40 to the first input / output interface 11. For instance, if the battery module 40 includes individual cells connected in series, taking two 4V series cells as an example, the buck or boost chip can draw 8V from the battery module 40 and step down the voltage to output a 5V supply voltage, providing the required supply voltage to the first input / output interface 11.

[0059] For example, the input terminal Vin2 of the second overvoltage protection circuit 62 can be connected to the output terminal of the buck-boost circuit 53, and the output terminal Vout2 of the second overvoltage protection circuit 62 can be connected to the first input / output interface 11. The second overvoltage protection circuit 62 can be used to compare the voltage output by the buck-boost circuit 53 with a first voltage limit. If the voltage output by the buck-boost circuit 53 is less than or equal to the first voltage limit, the second overvoltage protection circuit 62 is in an unprotected state, allowing the voltage output by the buck-boost circuit 53 to flow to the first input / output interface 11. If the voltage output by the buck-boost circuit 53 is greater than the first voltage limit, the second overvoltage protection circuit 62 is in a protected state, prohibiting the voltage output by the buck-boost circuit 53 from flowing to the first input / output interface 11, thereby providing overvoltage protection for the first input / output interface 11.

[0060] In some embodiments of this disclosure, the charging circuit may also power the second input / output interface 12. Exemplarily, the power management circuit powers the second input / output interface 12 in response to the charging circuit being in a second power supply mode. For example, the second input / output interface 12 may be connected to an external device for communication. Exemplarily, after an electronic device hands over to a peripheral device via the second input / output interface 12, it can communicate through the second input / output interface 12 and obtain the protocol types supported by the peripheral device and the required power supply voltage. When the peripheral device supports a specific protocol type, it can enter the second power supply mode, activate the power management circuit 20, and supply power to the peripheral device with the voltage required.

[0061] refer to Figure 2 As shown, in the second power supply mode, the charge pump circuit 51 can operate in buck mode, which reduces the input voltage of the bidirectional charge pump circuit 51 output by the battery module 40 to the battery voltage terminal VBAT1 of the power management circuit 20. The power supply terminal VBUS1 of the power management circuit 20 can output the power supply voltage required by the second input / output interface 12.

[0062] In one exemplary embodiment of this disclosure, reference is made to Figure 2 As shown, a first on / off switch 63 is provided between the first input / output interface 11 and the power supply terminal VBUS1 of the power management circuit 20; the first on / off switch 63 is turned off in response to the charging circuit being in the first power supply mode. Specifically, when the charging circuit is operating in the first power supply mode, the first on / off switch 63 can cut off the path between the first input / output interface 11 and the power management circuit 20, protecting the power management circuit 20 from reverse power flow. In some embodiments, the first on / off switch 63 can also protect the circuit where the second input / output interface 12 is located. For example, the second input / output interface 12 is a Type-C interface. The Type-C interface and the corresponding protocol chip can form a relatively independent sub-circuit module and be interconnected with the device motherboard through a board-to-board connector. The first on / off switch 63 is turned off in response to the charging circuit being in the first power supply mode, which can prevent reverse power flow to the sub-circuit module of the second input / output interface 12 when the power management circuit 20 supplies power to the first input / output interface 11.

[0063] In one exemplary embodiment of this disclosure, the charging circuit includes a first overvoltage protection circuit 61. (See reference...) Figure 2As shown, the input terminal Vin3 of the first overvoltage protection circuit 61 is connected to the first input / output interface 11 and the second input / output interface 12, and the output terminal Vout3 of the first overvoltage protection circuit 61 is connected to the power supply terminal VBUS1 of the power management circuit 20. Specifically, the first overvoltage protection circuit 61 can be used to compare the voltage input to the first input / output interface 11 or the second input / output interface 12 with a second voltage limit. If the voltage input to the input / output interface is less than or equal to the second voltage limit, the first overvoltage protection circuit 61 is in an unprotected state, allowing the voltage input to the first input / output interface 11 or the second input / output interface 12 to flow to the power management circuit 20. If the voltage input to the input / output interface is greater than the second voltage limit, the first overvoltage protection circuit 61 is in a protected state, prohibiting the voltage input to the first input / output interface 11 or the second input / output interface 12 from flowing to the power management circuit 20, thereby preventing high-voltage charging signals from damaging the power management circuit 20 (e.g., the PMIC chip) and the battery module 40.

[0064] refer to Figure 2 As shown, a second on / off switch 64 is provided between the second input / output interface 12 and the power supply terminal VBUS1 of the power management circuit 20; the second on / off switch 64 can be turned off when the first input / output interface 11 is charging the battery module 40. Specifically, when the first input / output interface 11 is charging the battery module 40, the second on / off switch 64 can cut off the path between the second input / output interface 12 and the power management circuit 20, protecting the circuit where the second input / output interface 12 is located.

[0065] Specifically, in the exemplary embodiments of this disclosure, the first on / off switch 63 is turned off in response to the charging circuit being in the first power supply mode, without affecting the power supply path of the battery module 40 to the first input / output interface 11 or the charging path of the second input / output interface 12 to the battery module 40. One possible application scenario is that the first input / output interface 11 is a POGO pin interface, and the second input / output interface 12 is a Type-C interface. The tablet computer connects to the keyboard via the POGO pin interface and to the charger via the Type-C interface, thereby enabling the Type-C interface charger to charge the battery module 30 without affecting the use of the keyboard.

[0066] For example, refer to Figure 2As shown, the first on / off switch 63 may include a first switching transistor Q1 and a second switching transistor Q2. Both the first switching transistor Q1 and the second switching transistor Q2 can be metal-oxide-semiconductor (MOS) field-effect transistors. In one embodiment, the source of the first switching transistor Q1 and the source of the second switching transistor Q2 are connected together, the drain of the first switching transistor Q1 is connected to the first input / output interface 11, and the drain of the second switching transistor Q2 is connected to the input terminal Vin3 of the first overvoltage protection circuit 61. The gates of the first switching transistor Q1 and the second switching transistor Q2 serve as control terminals and are communicatively connected to the processor. Specifically, for example, the gates of the first switching transistor Q1 and the second switching transistor Q2 are connected to the control pins of the bidirectional charge pump circuit 51. The bidirectional charge pump circuit 51 is communicatively connected to the processor and is used to control the on / off state of the first switching transistor Q1 and the second switching transistor Q2 according to the operating mode of the charging circuit (e.g., first power supply mode, second power supply mode, first charging mode, second charging mode, etc.), thereby controlling the opening and closing of the first on / off switch 63.

[0067] It is understood that the basic working principle of a MOSFET is: by applying a control level to the gate (G), the source (S) and drain (D) are turned on or off. MOSFETs can be divided into NMOS and PMOS, and according to different control levels, they can be further divided into enhancement-mode and depletion-mode. However, in the embodiments of this disclosure, there are no restrictions on the type of MOSFET, and all types can implement the scheme of this disclosure. Those skilled in the art can implement hardware selection and logic control according to specific needs, and this disclosure will not elaborate further on this.

[0068] In addition, the MOSFET includes a parasitic diode. This disclosure sets the first switch Q1 and the second switch Q2 in series, and the parasitic diodes of the first switch Q1 and the second switch Q2 are in opposite directions, thereby achieving bidirectional conduction and bidirectional cutoff of current. Regardless of the level on both sides of the first on / off switch 63, a cutoff effect can be formed, effectively avoiding leakage.

[0069] In some embodiments, the structure of the second on / off switch 64 can be similar to that of the first on / off switch 63. Specifically, refer to... Figure 2As shown, the second on / off switch 64 includes a third switch Q3 and a fourth switch Q4. Both the third switch Q3 and the fourth switch Q4 can be MOSFETs. In one embodiment, the source of the third switch Q3 and the source of the fourth switch Q4 are connected together, the drain of the third switch Q3 is connected to the second input / output interface 12, and the drain of the fourth switch Q4 is connected to the input terminal Vin3 of the first overvoltage protection circuit 61. The gates of the third switch Q3 and the fourth switch Q4 serve as control terminals and are communicatively connected to the processor. Specifically, for example, the gates of the third switch Q3 and the fourth switch Q4 are connected to the control pins of the bidirectional charge pump circuit 51. The bidirectional charge pump circuit 51 is communicatively connected to the processor and is used to control the on / off state of the third switch Q3 and the fourth switch Q4 according to the operating mode of the charging circuit, thereby controlling the opening and closing of the second on / off switch 64.

[0070] Based on the above-described charging circuit, this disclosure also provides an electronic device including any of the aforementioned charging circuits.

[0071] The electronic devices provided in this disclosure can be smartphones, tablets, wearable devices, in-vehicle devices, augmented reality (AR) / virtual reality (VR) devices, laptops, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc., that have input / output interfaces and can be connected to other external devices. This disclosure does not limit the specific type of electronic device.

[0072] In this embodiment, when the electronic device is connected to the charger at the first input / output interface 11, the battery module 40 can be charged through the first charging branch 30; when the charger is connected to the second input / output interface 12, the battery module 40 can also be charged through the first charging branch 30. Thus, either the first input / output interface 11 or the second input / output interface 12 can be occupied, for example, when an external device is connected, or when charging can only be performed through one of the first input / output interface 11 or the second input / output interface 12, fast charging can be achieved, which is beneficial to improving the convenience of charging electronic devices. At the same time, the cost is reduced by reusing the first charging branch 30.

[0073] refer to Figure 4The block diagram of the electronic device 700 shown may include one or more of the following components: processing component 702, memory 704, power component 706, multimedia component 708, audio component 710, input / output (I / O) interface 712, sensor component 714, and communication component 716.

[0074] Processing component 702 typically controls the overall operation of electronic device 700, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 702 may include one or more processors 720 to execute instructions. Furthermore, processing component 702 may include one or more modules to facilitate interaction between processing component 702 and other components. For example, processing component 702 may include a multimedia module to facilitate interaction between multimedia component 708 and processing component 702. As another example, processing component 702 may read executable instructions from memory 704 to implement relevant functions of electronic device 700. For example, processing component 702 is used to implement the functions of the first signal generation module 100 and the second signal generation module in the aforementioned exemplary embodiments.

[0075] Memory 704 is configured to store various types of data to support the operation of electronic device 700. Examples of this data include instructions for any application or method operating on electronic device 700, contact data, phonebook data, messages, pictures, videos, etc. Memory 704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0076] Power component 706 provides power to various components of electronic device 700. Power component 706 may include the aforementioned charging circuit. It may also include other components associated with generating, managing, and distributing power to electronic device 700.

[0077] Multimedia component 708 includes a screen that provides an output interface between electronic device 700 and user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 708 includes a front-facing camera and / or a rear-facing camera. When electronic device 700 is in an operating mode, such as a shooting mode or video mode, the front-facing camera and / or rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0078] Audio component 710 is configured to output and / or input audio signals. For example, audio component 710 includes a microphone (MIC) configured to receive external audio signals when electronic device 700 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 704 or transmitted via communication component 716. In some embodiments, audio component 710 also includes a speaker for outputting audio signals.

[0079] Input / output (I / O) interface 712 provides an interface between processing component 702 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons. For example, input / output (I / O) interface 712 may include the aforementioned first input / output interface 11 and second input / output interface 12.

[0080] Sensor assembly 714 includes one or more sensors for providing state assessments of various aspects of electronic device 700. For example, sensor assembly 714 can detect the on / off state of electronic device 700, the relative positioning of components such as the display and keypad of electronic device 700, changes in position of electronic device 700 or a component of electronic device 700, the presence or absence of user contact with electronic device 700, orientation or acceleration / deceleration of electronic device 700, and temperature changes of electronic device 700. Sensor assembly 714 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 714 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 714 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0081] Communication component 716 is configured to facilitate wired or wireless communication between electronic device 700 and other devices. Electronic device 700 can access wireless networks based on communication standards, such as WiFi, 2G, 3G, 4G, 5G, 6G, other communication standards, or combinations thereof. In some embodiments of this disclosure, communication component 716 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In some embodiments of this disclosure, communication component 716 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0082] In some embodiments of this disclosure, the electronic device 700 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0083] According to another aspect of this disclosure, an accessory device is provided, including the charging circuit of any of the foregoing embodiments. In this embodiment, when the accessory device is connected to a charger at the first input / output interface 11, it can charge the battery module 40 through the first charging branch 30; when the charger is connected to the second input / output interface 12, it can also charge the battery module 40 through the first charging branch 30. This allows for fast charging even when either the first input / output interface 11 or the second input / output interface 12 is occupied (e.g., when connecting to an external device), or when charging can only be performed through one of the first input / output interface 11 or the second input / output interface 12. This improves the convenience of charging the accessory device and reduces costs through the reuse of the first charging branch 30.

[0084] For example, the accessory device used in this article may be an “active” accessory capable of providing and / or receiving power.

[0085] For example, the accessory devices used in this article may be devices that combine with electronic devices to enhance the functionality of electronic devices, such as power banks (including wireless power banks), card readers, portable printers, shooting handles, keyboards, etc., which enhance the functionality and / or aesthetics of electronic devices; or devices that protect electronic devices, such as protective cases, stands, etc., which enhance the protection or support of electronic devices.

[0086] For example, the electronic devices used in this article can be broadly defined as including electronic computers and products controlled by electronic computers, such as robots.

[0087] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A charging circuit, characterized in that, It includes a battery module, a first input / output interface, a second input / output interface, a power management circuit, and a first charging branch, wherein: The first input / output interface and the second input / output interface are connected in parallel and then connected to the power supply terminal of the power management circuit and the input terminal of the first charging branch. The battery voltage terminal of the power management circuit and the output terminal of the first charging branch are connected to the battery module. When a first charging signal is input to the first input / output interface, the first adapter voltage input to the first input / output interface is converted into a first charging voltage through the first charging branch to charge the battery module; when a second charging signal is input to the second input / output interface, the second adapter voltage input to the second input / output interface is converted into the first charging voltage through the first charging branch to charge the battery module.

2. The charging circuit according to claim 1, characterized in that, The input voltage of the first charging branch is a first preset voltage, and the input voltage of the power management circuit is a second preset voltage. The first preset voltage is higher than the second preset voltage.

3. The charging circuit according to claim 2, characterized in that, The charging circuit also includes a bidirectional charge pump circuit, which is connected between the battery voltage terminal of the power management circuit and the battery module. The bidirectional charge pump circuit is at least used to boost the third preset voltage output from the power management circuit to the bidirectional charge pump circuit to the first charging voltage.

4. The charging circuit according to claim 2, characterized in that, In the first operating mode, the first charging branch reduces the first preset voltage to the first charging voltage to charge the battery module; in the second operating mode, the first charging branch uses the first preset voltage to charge the battery module.

5. The charging circuit according to claim 1, characterized in that, The first input / output interface is a contact interface, and the second input / output interface is a plug-in interface.

6. The charging circuit according to any one of claims 1 to 5, characterized in that, The first input / output interface is a POGO pin interface.

7. The charging circuit according to claim 1, characterized in that, The charging circuit also includes a boost circuit, the input terminal of which is connected to the voltage output terminal of the power management circuit, and the output terminal of which is connected to the first input / output interface. When the charging circuit is in a first power supply mode, the boost circuit converts the voltage input to the boost circuit into a power supply voltage to power the first input / output interface.

8. The charging circuit according to claim 1, characterized in that, The charging circuit also includes a buck-boost circuit. The first input / output interface is connected to the output of the buck-boost circuit, and the input of the buck-boost circuit is connected to the battery module. When the charging circuit is in a first power supply mode, the buck-boost circuit converts the voltage input to the buck-boost circuit into a power supply voltage to power the first input / output interface.

9. The charging circuit according to claim 7 or 8, characterized in that, The charging circuit is in the second power supply mode, and the power management circuit supplies power to the second input / output interface.

10. The charging circuit according to claim 7 or 8, characterized in that, A first on / off switch is provided between the first input / output interface and the power supply terminal of the power management circuit; when the charging circuit is in the first power supply mode, the first on / off switch is turned off.

11. The charging circuit according to claim 7 or 8, characterized in that, The charging circuit includes a first overvoltage protection circuit; the input terminal of the first overvoltage protection circuit is connected to the first input / output interface and the second input / output interface, and the output terminal of the first overvoltage protection circuit is connected to the power supply terminal of the power management circuit.

12. The charging circuit according to claim 7, characterized in that, The charging circuit includes a second overvoltage protection circuit; the input terminal of the second overvoltage protection circuit is connected to the output terminal of the boost circuit, and the output terminal of the second overvoltage protection circuit is connected to the first input / output interface.

13. The charging circuit according to claim 8, characterized in that, The charging circuit includes a second overvoltage protection circuit; the input terminal of the second overvoltage protection circuit is connected to the output terminal of the buck-boost circuit, and the output terminal of the second overvoltage protection circuit is connected to the first input / output interface.

14. An electronic device, characterized in that, The charging circuit includes any one of claims 1 to 13.

15. An accessory device, characterized in that, The charging circuit includes any one of claims 1 to 13.

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