Charging circuit and electronic device

Abstract

This application discloses a charging circuit and electronic device, belonging to the field of circuit technology. The charging circuit includes: a first charging chip, the power input terminal of the first charging chip being connected to a charging interface, and the power output terminal of the first charging chip being connected to a first battery; a second charging chip, the power input terminal of the second charging chip being connected to the charging interface, and the power output terminal of the second charging chip being connected to a second battery; a switching module, the first terminal of the switching module being connected to the first battery, the second terminal being connected to the second battery, and the control terminal of the switching module being connected to the output terminal of a logic control circuit; and a logic control circuit, used to control the switching module to disconnect when the dual-battery electronic device is in charging mode, so that the first battery and the second battery are disconnected, and to control the switching module to conduct when the dual-battery electronic device is in normal operating mode, so that the first battery and the second battery are connected in parallel.

Description

Technical Field

[0001] This application belongs to the field of circuit technology, specifically relating to a charging circuit and an electronic device. Background Technology

[0002] With the rapid development of flexible screen technology, foldable screen electronic devices are becoming increasingly common in the market. These devices offer many advantages, such as larger screens and more diverse usage options, but they also face numerous challenges in hardware design, such as how to increase battery capacity to address the power consumption issues associated with larger screens.

[0003] To increase battery capacity, foldable screen electronic devices can incorporate dual batteries connected in parallel or in series. One battery is located in the main body of the device, and the other in the secondary body. For foldable screen electronic devices with parallel dual batteries, a charging chip can be installed in the main body to charge the parallel dual batteries.

[0004] However, for parallel dual batteries, the charging chip has different circuits to different batteries with different circuit impedances. It is difficult for the charging chip to match the circuit impedance of the two batteries at the same time, which can lead to one battery being overcharged, causing safety issues, and the other battery not being fully charged, thus not being able to obtain more battery capacity. Summary of the Invention

[0005] The purpose of this application is to provide a charging circuit and electronic device that can solve the problem of poor battery charging performance in dual-battery electronic devices.

[0006] In a first aspect, embodiments of this application provide a charging circuit applied to a dual-battery electronic device, the dual-battery electronic device including a first battery and a second battery, the charging circuit including:

[0007] A first charging chip has its power input terminal connected to a charging interface and its power output terminal connected to the first battery to charge the first battery.

[0008] The second charging chip has its power input terminal connected to the charging interface and its power output terminal connected to the second battery to charge the second battery.

[0009] A switching module, wherein a first terminal of the switching module is connected to the first battery, a second terminal of the switching module is connected to the second battery, and a control terminal of the switching module is connected to the output terminal of a logic control circuit;

[0010] The logic control circuit is used to control the switching module to disconnect when the dual-battery electronic device is in charging mode, so as to disconnect the first battery from the second battery; and to control the switching module to turn on when the dual-battery electronic device is in normal operating mode, so as to connect the first battery and the second battery in parallel.

[0011] Secondly, embodiments of this application provide an electronic device, which includes the charging circuit described in the first aspect.

[0012] Thirdly, embodiments of this application provide a chip that includes the charging circuit described in the first aspect.

[0013] According to the charging circuit provided in the embodiments of this application, the logic control circuit can control the switch module to disconnect when the dual-battery electronic device is in charging mode, thereby disconnecting the first battery from the second battery and allowing the first and second batteries to charge independently. Specifically, the first charging chip charges the first battery, and the second charging chip charges the second battery, preventing one battery from being overcharged and / or the other from not being fully charged. Furthermore, during charging, the first and second batteries can generate heat evenly, reducing the peak temperature of the batteries during charging. Therefore, charging safety and the battery capacity after charging are improved. When the dual-battery electronic device is in normal operating mode, the logic control circuit can control the switch module to conduct, enabling the first and second batteries to conduct together. The conducted first and second batteries together supply power to the dual-battery electronic device, providing sufficient power. Attached Figure Description

[0014] Figure 1 An example diagram of a dual-battery layout for foldable screen electronic devices;

[0015] Figure 2 Example diagram of charging path for parallel dual batteries;

[0016] Figure 3 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 1 ;

[0017] Figure 4 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 2 ;

[0018] Figure 5 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 3 ;

[0019] Figure 6 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 4 ;

[0020] Figure 7 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 5 ;

[0021] Figure 8 A schematic diagram of the logic control circuit provided in the embodiments of this application. Figure 1 ;

[0022] Figure 9 A schematic diagram of the logic control circuit provided in the embodiments of this application. Figure 2 .

[0023] Figure label:

[0024] 10. First charging chip; 20. Second charging chip; 30. Switch module; 40. Logic control circuit; 41. First diode component; 42. Second diode component; 43. First voltage divider resistor; 44. Second voltage divider resistor; 45. Third diode component. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The charging circuit provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0029] Taking dual-battery devices as an example of foldable screen devices, Figure 1 This is an example diagram of a dual-battery layout for a foldable screen electronic device. Figure 1 As shown, in foldable screen electronic devices, to solve the power consumption problem caused by the large screen, batteries are respectively installed on the main body and the secondary body connected by a hinge. Figure 1 The main unit battery and the secondary unit battery are located in the main unit and the secondary unit battery, respectively. The main unit battery powers the main unit motherboard, and the secondary unit battery powers the secondary unit motherboard.

[0030] Charging circuits in dual-battery electronic devices can be designed in either parallel or series configurations. Series-connected dual batteries require a higher charging voltage, while parallel-connected dual batteries only need a standard charging voltage.

[0031] For parallel dual batteries, Figure 2 This is an example diagram of the charging path for a parallel dual-battery system. (See diagram below.) Figure 2 As shown, the charging path from the integrated circuit chip (IC, hereinafter referred to as the charging chip) to the battery includes: printed circuit board (PCB) traces, board-to-board (BTB) impedance, flexible printed circuit (FPC) traces, etc.

[0032] Because of the line losses between the charging chip and the battery, the charging parameters need to be set to account for path voltage drop in order to improve battery capacity and fully charge the battery as much as possible. Let the battery's charging cutoff current be I. TREM For example, the voltage of the charging chip needs to meet the following formula 1:

[0033] V OUT =V CELL +I TERM *(R PCB +R BTB +R FPC )--Formula 1

[0034] Among them, V OUT V is the full charge voltage of the charging chip. CELL R is the battery voltage. PCB R is the resistance value of the PCB. BTB R is the resistance value of BTB. FPC This represents the resistance value of the FPC.

[0035] Assuming the battery's full charge voltage is 4.45V, and without considering line impedance, the actual battery voltage after the charging IC cuts off charging is as follows: Formula 2:

[0036] V CELL =4.45VI TERM *(R PCB +R BTB +R FPC )--Formula 2

[0037] It is evident that the design of charging parameters must take into account the voltage drop caused by line impedance; otherwise, the battery cannot be fully charged.

[0038] To account for the voltage drop caused by line impedance, one approach is to increase the full-charge voltage V of the charging chip during the charging parameter design. OUT Ensure the battery voltage VCELL reaches 4.45V, as shown in Formula 3:

[0039] V CELL =4.45V+I TERM *(R PCB +R BTB +R FPC )--Formula 3

[0040] However, in a parallel dual-battery charging scheme, the two batteries are placed in the main and secondary chassis respectively, and the line impedance from the charging chip to the two batteries will inevitably be different. If the charging chip is placed in the main chassis, the line impedance from the charging chip to the secondary chassis battery will inevitably be very high, and vice versa. The charging chip cannot simultaneously match the line compensation for both the main chassis battery and the secondary chassis battery. Taking the charging chip placed in the main chassis as an example:

[0041] Option 1: Using the circuit impedance of the main battery as compensation. Since the circuit impedance of the secondary battery is greater than that of the main battery, the secondary battery will not be fully charged and will not obtain the maximum battery capacity. Option 2: Using the circuit impedance of the secondary battery as compensation. Since the circuit impedance of the secondary battery is greater than that of the main battery, the main battery will be overcharged, causing safety issues with the battery cells.

[0042] To address the aforementioned problems, this application provides a charging circuit for a dual-battery electronic device comprising a first battery and a second battery. The charging circuit includes a first charging chip for charging the first battery, a second charging chip for charging the second battery, a switching module for establishing and disconnecting the connection between the first and second batteries, and a logic control circuit for controlling the switching module to be on or off based on the current mode of the dual-battery electronic device. The logic control circuit can control the switching module to be off when the dual-battery electronic device is in charging mode, allowing the first and second batteries to be disconnected and charged independently. This avoids overcharging of one battery and / or incomplete charging of the other. Furthermore, during charging, the first and second batteries can generate heat evenly, reducing peak battery temperatures and improving charging safety and battery capacity after charging. When the dual-battery electronic device is in normal operating mode, the logic control circuit can control the switching module to be on, connecting the first and second batteries. The connected first and second batteries together supply power to the dual-battery electronic device, providing sufficient capacity.

[0043] refer to Figure 3 , Figure 3 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 1 .like Figure 3 As shown, the charging circuit includes:

[0044] The first charging chip 10 has its power input terminal connected to a charging interface and its power output terminal connected to a first battery to charge the first battery.

[0045] The second charging chip 20 has its power input terminal connected to the charging interface and its power output terminal connected to the second battery to charge the second battery.

[0046] The first end of the switch module 30 is connected to the first battery, the second end of the switch module 30 is connected to the second battery, and the control end of the switch module 30 is connected to the output end of the logic control circuit 40.

[0047] The logic control circuit 40 is used to control the switch module 30 to disconnect when the dual-battery electronic device is in charging mode, so as to disconnect the first battery from the second battery; and to control the switch module 30 to turn on when the dual-battery electronic device is in normal operating mode, so as to connect the first battery and the second battery in parallel.

[0048] In this embodiment, when the dual-battery electronic device is in charging mode, independent charging of the first and second batteries is achieved through a first charging chip 10 charging the first battery, a second charging chip 20 charging the second battery, and a logic control circuit 40 controlling the switch module 30 to disconnect. The first charging chip 10 can independently compensate for line losses in the charging path of the first battery, and the second charging chip 20 can independently compensate for line losses in the charging path of the second battery. This prevents one battery from being overcharged or the other from failing to fully charge, thus improving the battery capacity of the dual-battery device. When the dual-battery electronic device is in normal operating mode, the logic control circuit 40 controls the switch module 30 to conduct, allowing the first and second batteries to be connected in parallel. The first and second batteries supply power to the dual-battery electronic device in parallel, providing sufficient power.

[0049] like Figure 3 As shown, the power input terminal of the first charging chip 10 is connected to the charging interface, and the power output terminal of the first charging chip 10 is connected to the first battery. When the charging interface is connected to an external power source, power flows from the power input terminal of the first charging chip 10 into the first charging chip 10, and the first charging chip 10 then provides power to the first battery through the power output terminal, thereby charging the first battery.

[0050] Similarly, the power input terminal of the second charging chip 20 is connected to the charging interface, and the power output terminal of the second charging chip 20 is connected to the second battery. When the charging interface is connected to an external power source, power flows from the power input terminal of the second charging chip 20 into the second charging chip 20, and the second charging chip 20 then provides power to the second battery through the power output terminal, thereby charging the second battery.

[0051] The power output terminal of the first charging chip 10 can be connected to the positive terminal of the first battery so that power flows to the first battery after passing through the first charging chip 10. The power output terminal of the second charging chip 20 can be connected to the positive terminal of the second battery so that power flows to the second battery after passing through the second charging chip 20.

[0052] The charging interface serves as the connection point for the dual-battery electronic device to external devices. These external devices may include power supplies and / or other electronic equipment, and the charging interface is used to transmit electrical energy. "Charging mode" refers to a situation where the charging interface of the dual-battery electronic device is connected to an external device capable of outputting electrical energy, and that external device is providing power for the dual-battery electronic device. "Normal operation mode" refers to a situation where the charging interface of the dual-battery electronic device is not connected to an external device, and the dual-battery electronic device is powered by both the first and second batteries.

[0053] Optionally, the charging port can also be used to transfer data.

[0054] like Figure 3 As shown, the first end of the switch module 30 is connected to the first battery, the second end of the switch module 30 is connected to the second battery, and the control end of the switch module 30 is connected to the output end of the logic control circuit 40. When the first end and the second end of the switch module 30 are connected, the first battery and the second battery are connected, forming a parallel dual-battery system; when the first end and the second end of the switch module 30 are disconnected, the first battery and the second battery are disconnected. When the first battery and the second battery are disconnected, the charging path of the first battery is the line path from the first charging chip 10 to the first battery, and the charging path of the second battery is the line path from the second charging chip 20 to the second battery. Therefore, the charging paths of the first battery and the second battery are independent of each other.

[0055] The level signal received at the control terminal of the switch module 30 can affect the conduction and disconnection between the first terminal and the second terminal of the switch module 30. Therefore, when the dual-battery electronic device is in charging mode, the logic control circuit 40 can output a first level signal to the control terminal of the switch module 30 to control the switch module 30 to disconnect, thus disconnecting the first battery from the second battery; when the dual-battery electronic device is in normal operating mode, the logic control circuit 40 can output a second level signal to the control terminal of the switch module 30 to control the switch module 30 to conduct, thus connecting the first battery to the second battery.

[0056] In this implementation, the first level signal and the second level signal are different level signals. In one possible implementation, the first level signal is a high level signal and the second level signal is a low-high level signal; in another possible implementation, the first level signal is a low level signal and the second level signal is a high level signal.

[0057] In some embodiments, such as Figure 4 As shown ( Figure 4 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 2 The input terminal of the logic control circuit 40 is connected to the charging interface, and the logic control circuit 40 controls the switch module 30 to be turned on or off according to the level signal output by the charging interface.

[0058] In this embodiment, since the charging interface is used to connect to external devices, especially external power sources, the level signal output by the charging interface can reflect whether the dual-battery electronic device is connected to an external device, that is, whether the dual-battery device is in charging mode. The logic control circuit 40 controls the switch module 30 to be turned on or off according to the level signal output by the charging interface, which can improve the accuracy and timeliness of the control of the switch module 30 to a certain extent. That is, it can promptly control the switch module 30 to be turned off when the dual-battery electronic device is in charging mode, and promptly control the switch module 30 to be turned on when the dual-battery electronic device is in normal operating mode.

[0059] In another possible implementation, the input of the logic control circuit 40 can be connected to the main controller of the dual-battery electronic device. Figure 4 (Not shown in the diagram), the main controller can output different level signals to the logic control circuit 40 based on the different modes of the dual-battery electronic device. The logic control circuit 40 controls the switch module 30 to be turned on or off according to the level signals output by the main controller. Thus, the logic control circuit 40 controls the switch module 30 to be turned off when the dual-battery electronic device is in charging mode, and controls the switch module 30 to be turned on when the dual-battery electronic device is in normal operating mode, thereby improving the accuracy and timeliness of the logic control circuit 40's control over the switch module 30.

[0060] In some embodiments, such as Figure 5 ( Figure 5 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 3 As shown in the figure, the logic control circuit 40 includes a first diode component 41, a second diode component 42, a first voltage divider resistor 43, and a second voltage divider resistor 44. Wherein:

[0061] The first end of the first diode component 41 is connected to the charging interface, the first end of the second diode component 42 is connected to the control terminal of the switch module 30, and the second end of the first diode component 41 is connected to the second end of the second diode component 42.

[0062] The first end of the first voltage divider resistor 43 is connected to the second end of the first diode component 41, and the second end of the first voltage divider resistor 43 is connected to the reference level.

[0063] The first end of the second voltage divider resistor 44 is connected to the second end of the second diode component 42, and the second end of the second voltage divider resistor 44 is connected to the power supply.

[0064] Specifically, the first diode 41 is turned on when the voltage level at its first terminal is higher than the voltage level at its second terminal. Similarly, the second diode 42 is turned on when the voltage level at its first terminal is higher than the voltage level at its second terminal.

[0065] Specifically, when a low-level signal is received at the input terminal of the switch module 30, the switch module 30 is turned on; when a high-level signal is received at the input terminal of the switch module 30, the switch module 30 is turned off.

[0066] The reference level connected to the second terminal of the first voltage divider resistor 43 can be low, so that the first voltage divider resistor 43 acts as a pull-down level in the charging circuit. The second voltage divider resistor 44 acts as a pull-up level in the charging circuit. In addition, the first voltage divider resistor 43 and the second voltage divider resistor 44 also act as a protection circuit in the charging circuit to prevent the first diode component 41 and the second diode component 42 from being damaged due to excessive current when they are turned on.

[0067] Optionally, the second terminal of the first voltage divider resistor 43 is grounded to improve the effect of the first voltage divider resistor 43 in pulling down the charging level in the charging circuit.

[0068] In this embodiment, when the dual-battery electronic device is in charging mode, the charging interface can output a high-level signal. The charging circuit operates as follows: Since the first voltage divider resistor 43 connected to the second terminal of the first diode 41 is connected to a reference level with a lower voltage level, when the charging interface outputs a high-level signal, the voltage level at the first terminal of the first diode 41 is higher than the voltage level at the second terminal of the first diode 41 (i.e., the voltage level at point a). The first diode 41 is turned on, and the voltage level at point a jumps from low to high. After the voltage level at point a increases, the voltage level at the second terminal of the second diode 42 is also high, and the voltage level at the first terminal of the second diode 42 is divided by the second voltage divider. When the power supply connected to resistor 44 and the second voltage divider resistor 44 is pulled up to a high level, it can be seen that the level of the first terminal of the second diode component 42 (i.e., the level at b) is not higher than the level of the second terminal of the second diode component 42 (i.e., the level at a), and the second diode component 42 is not conducting. When the second diode component 42 is not conducting, the level signal input to the control terminal of the switch module 30 is a high level signal. When the level signal at the control terminal of the switch module 30 is a high level signal, the first terminal and the second terminal of the switch module 30 are disconnected, thereby disconnecting the first battery from the second battery.

[0069] When the dual-battery electronic device is in normal operating mode, the charging interface can output a low-level signal. The charging circuit operates as follows: When the charging interface outputs a low-level signal, the levels at both the first and second ends of the first diode 41 (i.e., the level at point a) are low, and the first diode 41 is not conducting. Since the level at the first end of the second diode 42 is pulled high by the power supply connected to the second voltage divider resistor 44, the level at the first end of the second diode 42 (i.e., the level at point b) is higher than the level at the second end of the second diode 42 (i.e., the level at point a), and the second diode 42 conducts. With the second diode 42 conducting, the level at the first end of the second diode 42 jumps from high to low, and the level signal input to the control terminal of the switch module 30 is a low-level signal. With the level signal at the control terminal of the switch module 30 being a low-level signal, the first and second ends of the switch module 30 conduct, thus connecting the first and second batteries.

[0070] Therefore, in the above embodiments, the logic control circuit 40, which includes a first diode component 41, a second diode component 42, a first voltage divider resistor 43, and a second voltage divider resistor 44, enables the level signal control switch module 30 based on the charging interface to be turned on or off. That is, it enables the control of the first battery and the second battery to disconnect for independent charging when the dual-battery electronic device is in charging mode, and the control of the first battery and the second battery to connect to improve battery capacity when the dual-battery electronic device is in normal operating mode.

[0071] In some embodiments, the logic control circuit is further configured to control the switch module 30 to turn on when the dual-battery electronic device is in discharge mode, so that the first battery and the second battery are connected in parallel.

[0072] In discharge mode, the charging interface of the dual-battery electronic device is connected to an external device, and the dual-battery electronic device can output power to the external device through the charging interface.

[0073] For example, the discharge mode is OTG (On The Go) mode. In this mode, different devices can connect and exchange data with each other.

[0074] In this embodiment, when the dual-battery device is in discharge mode, the first and second batteries need to power external devices and the dual-battery electronic devices, resulting in high power consumption. To address the power consumption issue faced by the dual-battery device in discharge mode, the logic control circuit turns on the dual-battery device control switch module 30, enabling the first and second batteries to be connected in parallel and discharge together, thereby improving the discharge efficiency of the dual-battery device.

[0075] The device modes of dual-battery electronic devices include charging mode, discharging mode, and normal operation mode. The charging circuit on the dual-battery electronic device also includes the following embodiments:

[0076] In some embodiments, such as Figure 6 ( Figure 6 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 4 As shown in the figure, the input terminal of the logic control circuit 40 is connected to the charging interface and the main controller of the dual-battery electronic device. The logic control circuit 40 controls the switch module 30 to be turned on or off according to the level signal output by the charging interface and the level signal output by the main controller.

[0077] The main controller of the dual-battery electronic device can be the central processing unit (CPU) of the dual-battery electronic device.

[0078] In this embodiment, the level signals output by the charging interface and the main controller can accurately reflect whether the dual-battery electronic device is in charging mode, discharging mode, or normal operating mode. When the charging interface and the main controller of the dual-battery electronic device are connected, the logic control circuit 40 can control the switching module 30 to be turned on or off based on the level signals output by the charging interface and the main controller of the dual-battery electronic device, thereby improving the accuracy of the control of the switching module 30 and thus improving the charging, discharging, and operating performance of the dual-battery electronic device.

[0079] In some embodiments, when the charging interface of the dual-battery electronic device is connected to an external device, it outputs a high-level signal; otherwise, it outputs a low-level signal. When the dual-battery electronic device is in discharge mode, its main controller outputs a low-level signal; otherwise, it outputs a high-level signal. Therefore, when the dual-battery electronic device is in charging mode, the charging interface outputs a high-level signal, the main controller outputs a high-level signal, and the logic control circuit 40 controls the switch module 30 to disconnect, thus disconnecting the first battery from the second battery for independent charging. When the dual-battery electronic device is in discharge mode, the charging interface outputs a high-level signal, the main controller outputs a low-level signal, and the logic control circuit 40 controls the switch module 30 to turn on, so that the first battery and the second battery are connected in parallel to supply power to the dual-battery electronic device. When the dual-battery electronic device is in normal operating mode, the charging interface outputs a low-level signal, the main controller outputs a high-level signal, and the logic control circuit 40 controls the switch module 30 to turn on, so that the first battery and the second battery are connected in parallel to supply power to both the dual-battery electronic device and the external device.

[0080] Based on the above control logic, in some embodiments, such as Figure 7( Figure 7 A schematic diagram of the charging circuit provided in the embodiments of this application. Figure 5 As shown in the figure, the logic control circuit 40 includes a first diode component 41, a second diode component 42, a third diode component 45, a first voltage divider resistor 43, and a second voltage divider resistor 44. The connections of these components in the logic control circuit 40 are as follows:

[0081] The first end of the first diode component 41 is connected to the charging interface, the first end of the second diode component 42 is connected to the control terminal of the switch module 30, and the second end of the first diode component 41 is connected to the second end of the second diode component 42.

[0082] The first end of the third diode component 45 is connected to the first end of the second diode component 42, and the second end of the third diode component 45 is connected to the main controller.

[0083] The first end of the first voltage divider resistor 43 is connected to the first end of the first diode component 41, and the second end of the first voltage divider resistor 43 is connected to the reference level.

[0084] The first end of the second voltage divider resistor 44 is connected to the first end of the second diode component 42, and the second end of the second voltage divider resistor 44 is connected to the power supply.

[0085] The conduction conditions of the first diode 41 and the second diode 42 are described in the previous embodiments and will not be repeated here. The third diode 45 conducts when the voltage level at its first terminal is higher than the voltage level at its second terminal. The conduction and disconnection conditions of the switch module 30, and the first voltage divider resistor 43 and the second voltage divider resistor 44, can be described in the previous embodiments. Figure 5 The description of the illustrated embodiments will not be repeated.

[0086] In this embodiment, when the dual-battery electronic device is in charging mode, the charging interface outputs a high-level signal because it is connected to an external device, and the main controller can output a high-level signal. The charging circuit operates as follows: The voltage level at the second terminal of the first diode 41 is connected to a first voltage divider resistor 43 with a lower voltage level. When the charging interface outputs a high-level signal, the voltage level at the first terminal of the first diode 41 is higher than the voltage level at the second terminal (i.e., the voltage level at point a), so the first diode 41 is turned on, and the voltage level at point a jumps from low to high. Since point a is high, the voltage level at the second terminal of the second diode 42 is also high, and the second diode 42 is not turned on. When the main controller outputs a high level, the voltage levels at both the first and second terminals of the third diode 45 are not high, and the third diode is not turned on. When neither the second diode 42 nor the third diode 45 is turned on, the voltage level signal input to the control terminal of the switch module 30 is a high-level signal. When the voltage level signal at the control terminal of the switch module 30 is a high-level signal, the first and second terminals of the switch module 30 are disconnected, thus disconnecting the first battery from the second battery.

[0087] When the dual-battery electronic device is in normal operating mode, the charging interface outputs a low-level signal because no external device is connected, while the main controller outputs a high-level signal. The charging circuit operates as follows: When the charging interface outputs a low-level signal, both the level of the first terminal and the level of the second terminal of the first diode 41 are low, and the first diode 41 is not conducting. The level of the first terminal of the second diode 42 is pulled up to a high level by the second voltage divider resistor 44 connected to the power supply, and the level of the second terminal of the second diode 42 is pulled down to a low level by the first voltage divider resistor 43 connected to the reference voltage, thus the second diode 42 is conducting. When the main controller outputs a high-level signal, the third diode 45 is not conducting. Due to the conduction of the second diode 42, the level of the first terminal of the second diode 42 jumps from a high level to a low level, resulting in a low-level signal input to the control terminal of the switch module 30. When the control terminal of the switch module 30 outputs a low-level signal, the first and second terminals of the switch module 30 are connected, thus connecting the first and second batteries.

[0088] When the dual-battery electronic device is in discharge mode, the charging interface outputs a high-level signal due to the connection of an external device, while the main controller outputs a low-level signal due to discharge mode. The charging circuit operates as follows: When the charging interface outputs a high-level signal, the first terminal of the first diode 41 is at a high level, and the second terminal of the first diode 41 is at a low level, making the first diode 41 conduct, and the level at point a jumps from low to high. The level at the first terminal of the second diode 42 is pulled up to a high level by the second voltage divider resistor 44 connected to the power supply, and the level at the second terminal of the second diode 42 (i.e., the level at point a) is also high, meaning the second diode 42 is not conducting. When the main controller outputs a low level... When the signal is active, the level at the second terminal of the third diode 45 is low, and the level at the first terminal of the third diode 45 is pulled up to a high level by the second voltage divider resistor 44 connected to the power supply, thus turning on the third diode 45. Due to the conduction of the third diode 45, the level at point b jumps from high to low, and the level signal input to the control terminal of the switch module 30 is a low-level signal. When the level signal at the control terminal of the switch module 30 is a low-level signal, the first and second terminals of the switch module 30 are connected, thus connecting the first battery and the second battery.

[0089] Therefore, in the above embodiments, the logic control circuit 40, which includes a first diode component 41, a second diode component 42, a first voltage divider resistor 43, a second voltage divider resistor 44, and a third diode component 45, controls the switch module 30 to open or close based on the level signal of the charging interface and the level signal of the main controller. That is, it controls the first battery and the second battery to disconnect for independent charging when the dual-battery electronic device is in charging mode, and controls the first battery and the second battery to connect to increase battery capacity when the dual-battery electronic device is in normal operation mode or discharging mode.

[0090] As an example, the level signals and battery operating modes involved in the logic control circuit 40 are shown in the following table:

[0091]

[0092] like Figure 8 ( Figure 8 A schematic diagram of the logic control circuit provided in the embodiments of this application. Figure 1 As shown in the figure, diode D1 is the first diode component 41, diode D2 is the second diode component 42, and diode D3 is the third diode component 45.

[0093] like Figure 8 As shown, resistor R1 is the first voltage divider resistor 43, and resistor R2 is the second voltage divider resistor 44.

[0094] In addition, such as Figure 8 As shown, the charging interface can be a Universal Serial Bus (USB) interface, and the main controller can be a CPU. The negative terminals of the first and second batteries can be grounded. Figure 8 In this context, VBAT represents the power supply.

[0095] Based on any of the foregoing embodiments, the first charging chip 10 can use the line impedance of the charging circuit of the first battery as a compensation parameter; the second charging chip 20 can use the line impedance of the charging circuit of the second battery as a compensation parameter. The formula can be expressed as:

[0096] V OUT1 =V TERM1 +I TERM1 *R m1 V OUT2 =V TERM2 +I TERM2 *R m2 .

[0097] Among them, V OUT1 This indicates the full charge voltage of the first charging chip 10, V. TERM1 I represents the full charge voltage of the first battery. TERM1 R represents the charging cutoff current of the first battery. m1 This represents the path impedance of the first battery. V OUT2 This indicates the full charge voltage of the second charging chip 20, V. TERM2 I represents the full charge voltage of the second battery. TERM2 R represents the charging cutoff current of the second battery. m1 This represents the path impedance of the second battery.

[0098] In this way, both the first and second batteries can be fully charged.

[0099] In some embodiments, the charging circuit may further include a first thermistor and / or a second thermistor. The first thermistor is connected to the main controller of the dual-battery electronic device and is used to measure the temperature of the first battery. The main controller controls the current of the first battery based on its temperature. Alternatively, the second thermistor is connected to the main controller of the dual-battery electronic device and is used to measure the temperature of the second battery. The main controller controls the current of the second battery based on its temperature. This allows for timely adjustment of the battery charging current based on battery temperature, maximizing the charging speed of the dual-battery electronic device, minimizing heat generation, and improving the safety of the charging circuit.

[0100] In this embodiment, a first thermistor is positioned around the first battery to accurately detect its temperature, and a second thermistor is positioned around the second battery to accurately detect its temperature. The main controller can obtain the temperature of the first battery through the first thermistor and adjust the charging current of the first battery based on that temperature; similarly, the main controller can obtain the temperature of the second battery through the second thermistor and adjust the charging current of the second battery based on that temperature.

[0101] One possible current adjustment method is as follows: when the main controller detects that the temperature of the battery (first battery or second battery) has increased, it reduces the charging current of the battery (first battery or second battery) to achieve timely heat dissipation of the battery; when the main controller detects that the temperature of the battery has decreased, it increases the charging current of the battery to improve the charging speed of the battery.

[0102] Another possible current adjustment method is as follows: when the main controller detects that the temperature of the battery (first battery or second battery) is greater than the first threshold, it reduces the charging current of the battery (first battery or second battery) to achieve timely heat dissipation of the battery; when the main controller detects that the temperature of the battery is less than the second threshold, it increases the charging current of the battery to improve the charging speed of the battery.

[0103] like Figure 9 ( Figure 9 A schematic diagram of the logic control circuit provided in the embodiments of this application. Figure 2 As shown in the figure, thermistor NTC1 is the first thermistor, and thermistor NTC2 is the second thermistor.

[0104] The dual-battery electronic device in this application embodiment can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television set (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the specific devices.

[0105] Optionally, this application also provides an electronic device including the charging circuit provided in any of the foregoing embodiments. When the charging circuit in the electronic device is used for charging or power supply, the same technical effect as in the foregoing embodiments can be achieved. To avoid repetition, it will not be described again here.

[0106] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0107] Optionally, this application embodiment also provides a chip, which includes a charging circuit as provided in any of the foregoing embodiments. When charging or powering through the charging circuit on the chip, the same technical effect as in the foregoing embodiments can be achieved. To avoid repetition, it will not be described again here.

[0108] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0109] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A charging circuit applied to a dual-battery electronic device, the dual-battery electronic device comprising a first battery and a second battery, characterized in that, The charging circuit comprises: a first charging chip (10), an electric energy input end of the first charging chip (10) being connected with a charging interface, and an electric energy output end of the first charging chip (10) being connected with the first battery to charge the first battery; a second charging chip (20), an electric energy input end of the second charging chip (20) being connected with the charging interface, and an electric energy output end of the second charging chip (20) being connected with the second battery to charge the second battery; a switch module (30), a first end of the switch module (30) being connected with the first battery, a second end of the switch module (30) being connected with the second battery, and a control end of the switch module (30) being connected with an output end of a logic control circuit (40); the logic control circuit (40) is configured to control the switch module (30) to be turned off to disconnect the first battery from the second battery when the dual-battery electronic device is in a charging mode, and control the switch module (30) to be turned on to connect the first battery in parallel with the second battery when the dual-battery electronic device is in a normal working mode; the logic control circuit (40) comprises a first diode component (41), a second diode component (42), a first voltage dividing resistor (43), and a second voltage dividing resistor (44); a first end of the first diode component (41) is connected with the charging interface, a first end of the second diode component (42) is connected with the control end of the switch module (30), a second end of the first diode component (41) is connected with a second end of the second diode component (42); a first end of the first voltage dividing resistor (43) is connected with the second end of the first diode component (41), and a second end of the first voltage dividing resistor (43) is connected with a reference level; a first end of the second voltage dividing resistor (44) is connected with the second end of the second diode component (42), and a second end of the second voltage dividing resistor (44) is connected with a power supply; the logic control circuit (40) controls the switch module (30) to be turned on or turned off according to a level signal output by the charging interface.

2. The charging circuit of claim 1, wherein, an input end of the logic control circuit (40) is connected with a main controller of the dual-battery electronic device; the main controller outputs different level signals to the logic control circuit (40) based on different modes of the dual-battery electronic device; the logic control circuit (40) controls the switch module (30) to be turned on or turned off according to the level signal output by the main controller.

3. The charging circuit of claim 1, wherein, The logic control circuit (40) is further configured to control the switch module (30) to be turned on to connect the first battery in parallel with the second battery when the dual-battery electronic device is in a discharging mode.

4. The charging circuit of claim 3, wherein, an input end of the logic control circuit (40) is connected with a main controller of the dual-battery electronic device, and the logic control circuit (40) controls the switch module (30) to be turned on or turned off according to a level signal output by the charging interface and a level signal output by the main controller.

5. The charging circuit of claim 4, wherein, The logic control circuit (40) further comprises a third diode component (45); A first end of the third diode component (45) is connected to a first end of the second diode component (42), and a second end of the third diode component (45) is connected to the main controller.

6. The charging circuit according to any one of claims 1 to 5, wherein The charging circuit further comprises a first thermistor; The first thermistor is connected to a main controller of the dual-battery electronic device, the first thermistor is configured to measure a temperature of the first battery, and the main controller is configured to control a current of the first battery according to the temperature of the first battery.

7. The charging circuit according to any one of claims 1 to 5, wherein The charging circuit further comprises a second thermistor; The second thermistor is connected to a main controller of the dual-battery electronic device, the second thermistor is configured to measure a temperature of the second battery, and the main controller is configured to control a current of the second battery according to the temperature of the second battery.

8. An electronic device, comprising: The electronic device comprises the charging circuit according to any one of claims 1-7.

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