WO2020224467A1

WO2020224467A1 - Charging control circuit and electronic device

Info

Publication number: WO2020224467A1
Application number: PCT/CN2020/087140
Authority: WO
Inventors: 于文超; 文冲; 郑志勇; 汪会
Original assignee: 华为技术有限公司
Priority date: 2019-05-06
Filing date: 2020-04-27
Publication date: 2020-11-12
Also published as: CN111900769A

Abstract

Disclosed are a charging control circuit and an electronic device. The electronic device comprises a charging interface, a control circuit, a first battery and a second battery, which are coupled to each other, wherein the charging interface is used for being coupled to a charger; the first battery and the second battery are used for receiving charging currents of the charger; the control circuit is used for controlling, when the first battery and the second battery receive the charging currents, the first battery and the second battery to be connected in series; and the control circuit is further used for controlling, when the first battery and the second battery discharge, the first battery and the second battery to be connected in parallel.

Description

Charging control circuit and electronic equipment

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office of China with application number 201910372266.1, and the priority of the Chinese patent application with the title of "a charging control circuit and electronic equipment" on May 6, 2019. The entire content is incorporated into this application by reference.

Technical field

The embodiments of the application relate to the field of terminal technology, and in particular to a charging control circuit and electronic equipment.

Background technique

Terminal devices such as mobile phones and tablet computers have become essential electronic products in people's daily lives. However, as terminal devices have more and more functions, the battery life of the terminal device is getting shorter and shorter. Therefore, in order not to affect the user's use of the terminal device, how to quickly charge the terminal device has become an urgent technical problem to be solved. . At present, a common charging control circuit is to charge the battery after the output voltage of the charger is reduced by half through a high-low voltage conversion chip such as a switch capacitor (SW). In the above method, because the charging voltage of the battery is reduced, the charging current is increased, so that the battery can be quickly charged. However, since the heat loss of the circuit where the battery is located is proportional to the square of the current of the circuit where the battery is located, the heat loss is relatively large.

Summary of the invention

The embodiment of the application discloses a charging control circuit and electronic equipment, which are used to reduce the heat loss of the charging path and the discharging path of the battery.

The first aspect discloses an electronic device, which may include a charging interface, a control circuit, a first battery and a second battery that are coupled to each other; the charging interface may be coupled to a charger; the first battery and the second battery may receive the charging current of the charger ; The control circuit can control the first battery and the second battery to be connected in series when the first battery and the second battery receive the charging current; the control circuit can also control the first battery and the second battery when the first battery and the second battery are discharged Two batteries are connected in parallel. When the two batteries are charged, the two batteries are connected in series, and when the two batteries are discharged, the two batteries are connected in parallel. It can ensure that the two batteries are quickly charged while reducing the total current of the charging circuit, thereby reducing heat loss and ensuring that the energy loss of the discharging circuit is small.

As a possible implementation, the electronic device may also include a voltage conversion circuit, which is coupled to the control circuit and the charging interface; the voltage conversion circuit can convert the voltage of the charging interface, and use the converted voltage to the control circuit powered by. It can be seen that after the charger is connected, the control circuit is powered by the charger through the voltage conversion circuit. At this time, the first battery and the second battery are not required to supply power to the control circuit, which can ensure the balance of the power of the two batteries.

As a possible implementation manner, the voltage conversion circuit may be a step-down circuit. That is: the voltage of the charging interface is converted to power supply for the control circuit after step-down conversion.

As a possible implementation manner, when the charging interface is coupled to the charger and meets the conditions of series charging, the control circuit controls the first battery to be connected in series with the second battery and receives the charging current, which can reduce heat loss and/or ensure Balance between the first battery and the second battery. The conditions for series charging may be that the charging current flowing to the first battery and the second battery is greater than or equal to the second threshold; the sum of the charging current flowing to the first battery and the second battery is greater than or equal to the third threshold; the first battery and the second battery The power of the two batteries is greater than or equal to the fourth threshold; the voltages of the first battery and the second battery are greater than or equal to the fifth threshold; the temperatures of the first battery and the second battery are within a preset range; and/or the first battery The temperature of the charging path of the second battery and the second battery are respectively within at least one of the preset ranges.

As a possible implementation, the control circuit can also control the first battery and the second battery to switch from the series connection to the parallel connection when the first battery and the second battery are connected in series, when the conditions for parallel connection are met, When the two batteries meet the conditions of parallel connection during the series charging process, the parallel connection charging can ensure the balance between the first battery and the second battery. The conditions for parallel connection may be that the difference in power between the first battery and the second battery is greater than the sixth threshold; the temperature of the first battery or the second battery is greater than the seventh threshold; the temperature of the charging path of the first battery or the second battery Greater than the eighth threshold; the power of the first battery or the second battery is greater than the ninth threshold; the current flowing to the first battery or the second battery is less than the tenth threshold; and/or the sum of the current flowing to the first battery and the second battery is less than At least one of the eleventh thresholds.

As a possible implementation manner, the electronic device may further include a first switch, a second switch, and a third switch. The first battery may include a first terminal and a second terminal, and the second battery may include a third terminal and a fourth terminal. , The first terminal of the first battery is coupled to the control circuit, the second terminal of the first battery is connected to the first reference signal, and the third terminal of the second battery is coupled to the control circuit and the first terminal of the first battery through the first switch The third terminal of the second battery is coupled to the charging interface, the fourth terminal of the second battery is coupled to the control circuit and the first terminal of the first battery through the second switch, and the fourth terminal of the second battery is coupled through the third The switch is coupled to the first reference signal; the first battery and the second battery can be controlled to be connected in series by controlling the first switch to turn off, the second switch to turn on, and the third switch to turn off; the first switch to turn on , The second switch is turned off and the third switch is turned on to control the parallel connection of the first battery and the second battery. It can be seen that since there is no switch between the first battery and the control circuit, the switching of the two batteries connected in series and parallel, the switching of the switch state, or the plugging and unplugging of the charger will not cause sudden power failure of the control circuit, which can ensure the first The battery supplies power to the control circuit, thereby ensuring that the control circuit does not lose power.

As a possible implementation, the electronic device may further include a fourth switch, the third terminal of the second battery is coupled to the voltage conversion circuit and the charging interface through the fourth switch, and the control circuit may also control the working state of the fourth switch. Controlling the connection of the charging interface with the first battery and the second battery can protect the charging safety.

As a possible manner, the first reference signal may be a reference ground signal.

A second aspect discloses a charging control circuit, which is applied to an electronic device including at least two batteries. The charging control circuit may include a coupled control circuit and a switch circuit. The control circuit controls the working state of the switch circuit; The switch circuit indicates the first control signal, and the switch circuit can work in the first working state according to the first control signal, so that when the first battery and the second battery receive the charging current, the first battery and the second battery are connected in series; when the control circuit The switch circuit indicates the second control signal, and the switch circuit can also work in the second working state according to the second control signal, so that when the first battery and the second battery are discharged, the first battery and the second battery are connected in parallel. When the two batteries are charged, the two batteries are connected in series, which can ensure that the two batteries are quickly charged, while reducing the total current of the charging circuit, thereby reducing heat loss, and when the two batteries are discharged, the two batteries Parallel connection can ensure that the energy loss of the discharge circuit is small.

As a possible way, the charging control circuit can also include a voltage conversion circuit, which is respectively coupled to the switch circuit and the control circuit; the voltage conversion circuit can convert the voltage of the charging interface of the electronic device, and use the converted voltage Supply power to the control circuit. It can be seen that after the charger is connected, the control circuit is powered by the charger through the voltage conversion circuit. At this time, the first battery and the second battery are not required to supply power to the control circuit, which can ensure the balance of the power of the two batteries.

As a possible way, the voltage conversion circuit can be a step-down circuit. That is: step-down conversion of the voltage of the charging interface of the electronic device, and use the step-down converted voltage to supply power to the control circuit.

As a possible way, when the charging interface of the electronic device is coupled to the charger and meets the conditions for series charging, the switch circuit controls the first battery and the second battery to be connected in series to receive the charging current, which can reduce heat loss and/ Or to ensure the balance between the first battery and the second battery. The conditions for series charging may be that the charging current flowing to the first battery and the second battery is greater than or equal to the second threshold; the sum of the charging current flowing to the first battery and the second battery is greater than or equal to the third threshold; the first battery and the second battery The power of the two batteries is greater than or equal to the fourth threshold; the voltages of the first battery and the second battery are greater than or equal to the fifth threshold; the temperatures of the first battery and the second battery are within a preset range; and/or the first battery The temperature of the charging path of the second battery and the second battery are respectively within at least one of the preset ranges.

As a possible way, the switch circuit can also control the first battery and the second battery to switch from the series connection to the parallel connection when the first battery and the second battery are connected in series when the conditions for the parallel connection are met, so as to ensure that the first battery and the second battery are connected in parallel. The balance between the power of the first battery and the second battery. The conditions for parallel connection may be that the difference between the power of the first battery and the power of the second battery is greater than the sixth threshold; the temperature of the first battery or the temperature of the second battery is greater than the seventh threshold; the temperature of the charging path of the first battery or The temperature of the charging path of the second battery is greater than the eighth threshold; the charge of the first battery or the charge of the second battery is greater than the ninth threshold; the current to the first battery or the current to the second battery is less than the tenth threshold; and/or The sum of the current flowing to the first battery and the current flowing to the second battery is less than at least one of the eleventh threshold.

As a possible way, the switch circuit may include a first switch, a second switch, and a third switch, the first battery includes a first terminal and a second terminal, the second battery includes a third terminal and a fourth terminal, and the first switch One end of the second switch is respectively coupled to the third end of the second battery and the charging interface, the other end of the first switch is respectively coupled to the control circuit and the first end of the first battery, and one end of the second switch is respectively coupled to the fourth end of the second battery Terminal and one terminal of the third switch, the other terminal of the second switch is respectively coupled to the control circuit and the first terminal of the first battery, and the other terminal of the third switch is respectively coupled to the second terminal of the first battery and the first reference signal; The switch circuit can control the first battery and the second battery to be connected in series by controlling the first switch to turn off, the second switch to turn on, and the third switch to turn off; the switch circuit can control the first switch to turn on and the second switch to turn off. And the third switch is turned on to control the parallel connection of the first battery and the second battery. It can be seen that since there is no switch between the first battery and the control circuit, the switching of the two batteries connected in series and parallel, the switching of the switch state, or the plugging and unplugging of the charger will not cause sudden power failure of the control circuit, which can ensure the first The battery supplies power to the control circuit, thereby ensuring that the control circuit does not lose power.

As a possible way, the switch circuit may further include a fourth switch, one end of the fourth switch is coupled to one end of the first switch, and the other end of the fourth switch is respectively coupled to the voltage conversion circuit and the charging interface; the switch circuit may also be based on The control signal controls the connection of the charging interface with the first battery and the second battery, which can protect the charging safety.

Description of the drawings

Figure 1 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application;

Fig. 2 is a schematic structural diagram of another electronic device disclosed in an embodiment of the present application;

Fig. 3 is a schematic structural diagram of another electronic device disclosed in an embodiment of the present application;

Fig. 4 is a schematic structural diagram of a charging control circuit disclosed in an embodiment of the present application.

Detailed ways

The embodiment of the application discloses a charging control circuit and electronic equipment.

Fig. 1 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present application. As shown in FIG. 1, the electronic device may include a processor 110, an internal memory 120, a charging management module 130, a power management module 140, a battery 150, a USB interface 160, an indicator 170, and the like. The battery 150 may include two batteries, namely, a first battery and a second battery.

It can be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device may include more or fewer components than those shown in the figure, or combine certain components, or split certain components, or arrange different components. The illustrated components can be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units. For example, the processor 110 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), and an image signal processor. (image signal processor, ISP), controller, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural-network processing unit (NPU), etc. Among them, the different processing units may be independent devices or integrated in one or more processors.

A memory may also be provided in the processor 110 to store instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory can store instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to use the instruction or data again, it can be directly called from the memory. Repeated accesses are avoided, the waiting time of the processor 110 is reduced, and the efficiency of the system is improved.

The internal memory 120 may be used to store computer executable program code, the executable program code including instructions. The internal memory 120 may include a storage program area and a storage data area. Among them, the storage program area can store an operating system, an application program required by at least one function, and the like. The data storage area can store data created during the use of the electronic device, etc. In addition, the internal memory 120 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash storage (UFS), etc. The processor 110 executes various functional applications and data processing of the electronic device by running instructions stored in the internal memory 120 and/or instructions stored in a memory provided in the processor.

The charging management module 130 is used to receive charging input from the charger. Among them, the charger can be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 130 may receive the charging input of the wired charger through the USB interface 160. In some embodiments of wireless charging, the charging management module 130 may receive the wireless charging input through the wireless charging coil of the electronic device. While the charging management module 130 charges the battery 150, it can also supply power to the electronic device through the power management module 140.

The power management module 140 is used to connect the battery 150, the charging management module 130 and the processor 110. The power management module 140 receives input from the battery 150 and/or the charging management module 130 to supply power to the processor 110. The power management module 140 may also be used to monitor parameters such as battery capacity, battery cycle times, and battery health status (leakage, impedance). In some other embodiments, the power management module 140 may also be provided in the processor 110. In other embodiments, the power management module 140 and the charging management module 130 may also be provided in the same device.

The USB interface 160 is an interface that complies with the USB standard specification, and specifically may be a Mini USB interface, a Micro USB interface, a USB Type C interface, and so on. The USB interface 160 can be used to connect a charger to charge the electronic device.

It can be understood that the interface connection relationship between the modules illustrated in the embodiment of the present invention is merely illustrative and does not constitute a structural limitation of the electronic device. In other embodiments of the present application, the electronic device may also adopt different interface connection modes in the foregoing embodiments, or a combination of multiple interface connection modes.

The indicator 170 may be an indicator light, which may be used to indicate the charging status, power change, and the like.

Fig. 2 is a schematic structural diagram of another electronic device disclosed in an embodiment of the present application. As shown in FIG. 2, the electronic device may include a charging interface, a control circuit, a first battery, and a second battery coupled to each other. The control circuit may be the processor 110, the charging management module 130, and/or the power management module 140 in FIG. 1. The first battery and the second battery may be the first battery and the second battery in FIG. 1. The battery capacity of the first battery and the second battery may be the same. among them:

Charging interface for coupling to the charger;

The first battery and the second battery are used to receive the charging current of the charger;

A control circuit for controlling the first battery and the second battery to be connected in series when the first battery and the second battery receive charging current;

The control circuit is also used to control the first battery and the second battery to be connected in parallel when the first battery and the second battery are discharged.

In the prior art, when the first battery and the second battery are charged, that is, when the first battery and the second battery receive charging current, the first battery and the second battery are connected in parallel, and the charging current flows to the first battery and the second battery. The sum of charging current. In the embodiment of this application, when the first battery and the second battery are charged, the first battery and the second battery are connected in series. At this time, the charging current flowing to the first battery and the second battery is the same, which is the current of the charging circuit . In the embodiment of the present application, when the first battery and the second battery are charged, the first battery and the second battery are connected in series, which reduces the total current of the charging circuit compared with the prior art, thereby reducing heat loss.

In the embodiment of the present application, when the first battery and the second battery are discharged, the first battery and the second battery are connected in parallel. When the battery capacity of the first battery and the second battery are the same, when the first battery and the second battery are discharged, the capacity difference between the two batteries can be less than the first threshold, and the first threshold can be 0, that is: the first battery and the second battery The capacity difference between the two batteries is as small as possible. The battery capacity of the first battery and the second battery can also be different, but the battery capacity difference between the first battery and the second battery should be less than a certain threshold to ensure that the battery capacity difference between the first battery and the second battery is as possible small.

In an embodiment, the electronic device may further include three switches, namely: a first switch K ₁ , a second switch K ₂ , and a third switch K ₃ . among them:

The first battery includes a first terminal and a second terminal; the second battery includes a third terminal and a fourth terminal.

In one embodiment, the first terminal may be the positive terminal of the first battery, and the second terminal may be the negative terminal of the first battery. The third terminal may be the positive terminal of the second battery, and the fourth terminal may be the negative terminal of the second battery.

The first terminal of the first battery can be coupled to the control circuit. The second terminal of the first battery may be connected to a first reference signal, where the first reference signal may be a ground reference signal.

The third end of the second battery can be K ₁ through the first switch and the first terminal of the first battery and a control circuit coupled to the third terminal of the second battery can be coupled with the charging interface. A fourth end of the second battery can be K ₂ and the first battery control circuit is coupled to a first terminal of the second switch, and the fourth end of the second battery ₃ may be coupled with the first reference signal through the third switch K .

The charging interface is coupled with the third terminal of the second battery and the first reference signal. The charging interface may be the interface connected to the charging input in FIG. 1.

In the embodiment of the present application, the operating states of the first switch K ₁ , the second switch K ₂ , and the third switch K ₃ are controlled by a control circuit, so that the first battery and the second battery can be connected in series or in parallel. The working state of the switch can include on or off. (The control signals of the control circuit for the first switch K ₁ , the second switch K ₂ , and the third switch K ₃ are not shown in the example diagram).

In one embodiment, the control circuit K ₁ OFF the first switch may be controlled by the control circuit, the third switch K ₃ is turned off, the second switch K ₂ is turned on, the first battery and a second battery connected in series.

In one embodiment, the control circuit may control the first switch K ₁ is turned on by the control circuit, the third switch K ₃ is turned on, the second switch K ₂ is turned off, the first battery and a second battery connected in parallel.

When the first battery and the second battery receive the charging current from the charger through the charging interface, it can be considered that the first battery and the second battery are charging, and the first battery and the second battery are not receiving the charging from the charger through the charging interface. When the first battery and the second battery have current output, it can be considered that the first battery and the second battery are discharging. Among them, the charger can be a wired charger or a wireless charger.

It can be understood that the switches in this embodiment, including the first switch K ₁ , the second switch K ₂ , and the third switch K ₃ , can be devices that realize the on and off functions. This embodiment does not specifically limit the realization form and form of the switch. In one embodiment, the switch may be a metal oxide semiconductor (MOS) tube. At this time, the control circuit can be connected to the gate of the MOS tube, and the switch can be turned on or off by controlling the gate voltage. For another example, the switch in this embodiment can also be a bipolar junction transistor (BJT). In this case, the control circuit can be connected to the base of the triode, and the switch can be turned on and off by controlling the base voltage. The switch can also be a switch circuit, and the control circuit is connected to the switch circuit to control the on or off of the switch circuit.

There may be no switch between the first battery and the control circuit, that is, the first battery is coupled to the control circuit. When the charger is plugged and unplugged, it can ensure that the first battery supplies power to the control circuit, thereby ensuring that the control circuit does not lose power.

In an embodiment, the electronic device may further include a voltage conversion circuit, and the voltage conversion circuit may be a step-down circuit. among them:

The voltage conversion circuit is coupled to the control circuit and the charging interface;

The voltage conversion circuit is used to convert the voltage of the charging interface and use the converted voltage to supply power to the control circuit.

When the charger is connected to the electronic device through the charging interface, the voltage conversion circuit can step down the voltage of the charging interface, and use the stepped-down voltage to power the control circuit, which can ensure that the voltage is converted to the voltage value required by the control circuit , The control circuit can control the first battery and the second battery not to supply power to the control circuit. That is, after the charger is connected, the charger supplies power to the control circuit through the voltage conversion circuit. The first battery and the second battery do not supply power to the control circuit. After the charger is disconnected, the first battery and the second battery are connected in parallel Supply power to the control circuit. The voltage conversion circuit can be connected between the USB interface 160 and the processor 110 in FIG. 1.

In an embodiment, the electronic device may further include a fourth switch K ₄ , wherein:

The third end of the second cell K ₄ coupled to the voltage converting circuit and the charging interface through the fourth switch.

In one embodiment, the working state K ₄ may be controlled by the fourth switch, charge the first battery and the second interface connected to a control cell.

For example, when the power of the first battery and the second battery is greater than the preset power threshold, the charging interface is abnormal, the voltage of the charging interface is abnormal, the current of the charging interface is abnormal, or the temperature is abnormal, the fourth switch K ₄ can be turned off to Disconnect the charging interface from the first battery and the second battery, or disconnect the charging path from the charging interface to the first battery and the second battery to protect the charging safety.

It is also possible to control the fourth switch K _{4 to be} turned on to connect the charging interface with the first battery and the second battery, so that the charging interface provides charging current to the first battery and the second battery.

In one embodiment, when the charging interface is coupled to the charger, the control circuit controls the working states of the first switch K ₁ , the second switch K ₂ , the third switch K ₃ , and the fourth switch K ₄ so that the first battery It is connected in series with the second battery, and the first battery and the second battery receive charging current. For example, the control circuit can control the first switch K _{1 to be} turned off, the second switch K _{2 to} turn on, the third switch K _{3 to turn} off, and the fourth switch K _{4 to} turn on, so that the first battery and the second battery are connected in series. A battery and a second battery receive charging current.

In one embodiment, when the charging interface is coupled to the charger, the control circuit can detect whether the difference in power between the first battery and the second battery is less than (or not greater than) the second threshold. When the power difference between the second batteries is less than the second threshold (or not greater than), it indicates that the balance between the first battery and the second battery is good, and the control circuit can control the first battery and the second battery in series Connect, and charge the first battery and the second battery connected in series. When it is detected that the power difference between the first battery and the second battery is greater than or equal to (or greater than) the second threshold, it indicates that the balance between the first battery and the second battery is poor, and the control circuit can first control The first battery is connected in parallel with the second battery, and the first battery and the second battery are connected in parallel to charge, until the difference in power between the first battery and the second battery is less than the second threshold (or not greater than), control The first battery and the second battery are switched from parallel connection charging to series connection charging.

In an embodiment, when the charging interface is coupled to the charger, the control circuit may also first determine whether the condition for the first battery and the second battery to be charged in series is satisfied. When the condition for the first battery and the second battery to be charged in series is satisfied, The control circuit can control the series connection of the first battery and the second battery, and the series connection and charging of the first battery and the second battery. When the condition for the first battery and the second battery to be charged in series is not met, the control circuit can control the first battery and the second battery to be connected in parallel, and to charge the first battery and the second battery in parallel until the first battery and the second battery are satisfied. When the second battery is charged in series, control the first battery and the second battery to switch from parallel connection to series connection.

The condition for the first battery and the second battery to be charged in series may be that the charging current flowing to the first battery and the second battery is greater than or equal to the third threshold, and the sum of the charging current flowing to the first battery and the second battery is greater than or equal to the fourth threshold. Threshold, the power of the first battery and the second battery are greater than or equal to the fifth threshold, the voltage of the first battery and the second battery are greater than or equal to the sixth threshold, and the temperature of the first battery and the second battery are within a preset range , And/or the temperature of the charging path of the first battery and the second battery are respectively within a preset range.

For example, when the charging current flowing to the first battery and the second battery is less than the third threshold value, or the sum of the charging current flowing to the first battery and the second battery is less than the fourth threshold value, the charging path of the first battery and the second battery The heat loss is small, the first battery and the second battery can be connected in parallel for charging. When the charging current flowing to the first battery and the second battery is greater than or equal to the third threshold, or the sum of the charging current flowing to the first battery and the second battery is greater than or equal to the fourth threshold, the The heat loss of the charging path is relatively high. The control circuit can control the first battery and the second battery to be charged in series, or the control circuit can control the first battery and the second battery to switch from parallel connection charging to series connection charging to reduce heat loss.

For another example, due to the safety of the battery, when the battery power is less than a certain value or the battery voltage is lower than a certain value, the battery cannot be charged with a large current. When the power of the first battery and the second battery are less than the fifth threshold, the voltage of the first battery and the second battery are less than the sixth threshold, and the charging current flowing to the first battery and the second battery is relatively small. The heat loss of the charging path of the second battery is small, so the first battery and the second battery can be connected in parallel for charging. When the power of the first battery and the second battery are greater than or equal to the fifth threshold, the voltages of the first battery and the second battery are greater than or equal to the sixth threshold, and the charging current flowing to the first battery and the second battery is relatively large, The heat loss of the charging path of the first battery and the second battery is relatively high. The control circuit can control the first battery and the second battery to be connected in series for charging, or the control circuit can control the first battery and the second battery to switch from parallel connection to series connection. Connect charging to reduce heat loss.

In addition, when the temperature of the first battery and/or the second battery is higher or lower than the preset range, and/or the temperature of the charging path of the first battery and/or the second battery is higher or lower than the preset range, that is : When the battery temperature is too high or too low, in order to ensure the safety of charging, the charging current is relatively small, and the heat loss of the charging path of the first battery and the second battery is small. Therefore, the first battery and the second battery can be connected in parallel for charging. When the temperature of the first battery and/or the second battery is in the preset range, and/or the temperature of the charging path of the first battery and/or the second battery is in the preset range, the Provides high-current charging. At this time, the heat loss of the charging path of the first battery and the second battery is relatively high. The control circuit can control the first battery and the second battery to be connected in series for charging, or the control circuit can control the first battery and the second battery. The battery is switched from parallel connection charging to series connection charging to reduce heat loss.

In one embodiment, when the charging interface is coupled to the charger, the control circuit may also first determine whether the difference in power between the first battery and the second battery is less than (or not greater than) the second threshold, and whether the first battery is satisfied. The conditions for a battery and a second battery to be charged in series. In the case where the power difference between the first battery and the second battery is less than the second threshold (or not greater than), and the first battery and the second battery are charged in series, the control circuit controls the first battery and the second battery Connect in series, and charge the first battery and the second battery in series connection. In the case that the power difference between the first battery and the second battery is greater than or equal to (or greater than) the second threshold, and the condition for the first battery and the second battery to be charged in series is not met, the first battery and the second battery can be maintained first. The two batteries are connected in parallel, and the first battery and the second battery are connected in parallel to charge, until the above conditions are met, the first battery and the second battery are controlled to switch from parallel connection charging to series connection charging. Wherein, the second threshold may be greater than the first threshold.

In the process of judging whether the first battery and the second battery are charged in series, and/or whether the power difference between the first battery and the second battery is less than (or not greater than) the second threshold, the fourth switch K ₄ can be on or off.

When the fourth switch K _{4 is} turned on, if the first battery and the second battery are connected in parallel at this time, the control circuit can control the first battery and the second battery to be connected in parallel for charging, and perform charging between the first battery and the second battery. While charging in parallel, the control circuit can determine whether the first battery and the second battery are charged in series.

When the fourth switch K _{4 is} off, the charging paths of the first battery and the second battery are disconnected at this time, and no charging current is input to the first battery and the second battery. At this time, the control circuit can first determine whether the first battery and the second battery are charged in series. When the first battery and the second battery are charged in series, the control circuit can control the first switch K _{1 to} open, and the second battery The switch K _{2 is} turned on, the third switch K _{3 is} turned off, and the fourth switch K _{4 is} turned on, so that the first battery and the second battery are connected in series, and the first battery and the second battery receive charging current. When the condition for the first battery and the second battery to be charged in series is not satisfied, the control circuit can keep the fourth switch K ₄ off and maintain the charging path off state. The control circuit can also control the first switch K _{1 to} turn on, the second switch K _{2 to turn} off, the third switch K _{3 to} turn on, and the fourth switch K _{4 to} turn on, so that the first battery and the second battery are connected in parallel. The battery and the second battery receive charging current.

When the first battery and the second battery are charged, after the first battery and the second battery are connected in series, the first battery and the second battery can remain connected in series until the first battery and the second battery are discharged. It is connected in parallel. When the first battery and the second battery are charged to meet the conditions for parallel connection, the series connection is switched to the parallel connection, and then the first battery and the second battery are charged in parallel connection.

The condition for parallel connection may be that the difference in power between the first battery and the second battery is greater than the seventh threshold. At this time, the difference in power between the first battery and the second battery is relatively large, that is, the first battery and the second battery The balance between the first battery and the second battery is poor, and the first battery and the second battery can be switched from serial connection charging to parallel connection charging to reduce the difference in power between the first battery and the second battery.

The condition for parallel connection may also be that the temperature of the first battery or the second battery is greater than the eighth threshold, and/or the temperature of the charging path of the first battery or the second battery is greater than the seventh threshold. At this time, the first battery and the second battery The battery can be switched from series connection charging to parallel connection charging.

The condition of parallel connection can also be that the power of the first battery or the second battery is greater than the ninth threshold. When the power of the first battery or the second battery is greater than the ninth threshold, at this time, the first battery and the second battery can be connected in series. The connection charging is switched to parallel connection charging.

The condition for parallel connection can also be that the current flowing to the first battery or the second battery is less than the tenth threshold, or the sum of the currents flowing to the first battery and the second battery is less than the eleventh threshold. At this time, the first battery and the second battery The heat loss of the charging path of the battery is relatively low. Therefore, the first battery and the second battery can be switched from series connection charging to parallel connection charging.

FIG. 3 is a schematic structural diagram of another electronic device disclosed in an embodiment of the present application. As shown in FIG. 3, the electronic device may include a charging interface, a control circuit, and a voltage conversion circuit. The electronic device may also include M+1 batteries, namely a first battery, a second battery, ..., an Mth battery, and an Mth battery. +1 battery, the electronic device may also include 3M+1 switches, namely, the first switch K ₁ , the second switch K ₂ , ..., the 3M switch K _3M, and the 3M+1 switch K _3M+1 , where M is greater than Or an integer equal to 1, where:

One end of the first battery through the first switch K ₁ are coupled to the interface and the charging voltage conversion circuit, a voltage conversion circuit coupled to the control circuit, a first end of the first cell by 3M + 1 switch K _{3M + 1} are respectively coupled to the control circuit, and M + 1 end of the battery, the other end of the first battery through the second switch K ₂ is coupled to a first reference signal, the other end of the first cell by a third switch K ₃ is coupled to an end of the second battery, the battery i One end of the ith battery is coupled to the other end of the i-1th battery through the 3i-3 switch K _3i-3 , and one end of the ith battery is respectively coupled to the control circuit and the M+1th battery through the 3i-2 switch K _3i-2 One end, the other end of the i-th battery is coupled to the first reference signal through the 3i-1 switch K _3i-1 , the other end of the i-th battery is coupled to one end of the i+1-th battery through the 3i-th switch K _3i , and the M+th 1 One end of the battery is coupled to the other end of the Mth battery through the 3M switch K _3M , one end of the M+1th battery is coupled to the control circuit, and the other end of the M+1th battery can be connected to the first reference signal, i=2, 3,...,M-1;

Charging interface for coupling to the charger;

M+1 batteries for receiving the charging current of the charger;

The control circuit is used to control the M+1 batteries to be connected in series when the M+1 batteries are charged and receive the charging current;

The control circuit is also used to control the M+1 batteries to be connected in parallel when the M+1 batteries are discharged.

Among them, one end of the first battery, the second battery,..., the Mth battery, and the M+1th battery may be the positive terminal, and the other end of the first battery, the second battery,..., the Mth battery and the M+1th battery It can be the negative terminal.

Among them, the electronic device shown in FIG. 3 is obtained by expanding the electronic device shown in FIG. 2 from two batteries to three or more batteries. The working principle is the same. For detailed description, please refer to the above description, which will not be repeated here. .

Fig. 4 is a schematic structural diagram of a charging control circuit disclosed in an embodiment of the present application. Among them, FIG. 4 is a charging control circuit for charging control of the first battery and the second battery in FIG. 1. As shown in Figure 4, the charging control circuit may include a coupled control circuit and a switch circuit, where:

The control circuit is used to send a control signal to the switch circuit;

The switch circuit is used to control the first battery and the second battery to be connected in series when the first battery and the second battery receive the charging current according to the control signal, and the charging current comes from a charger coupled to the charging interface;

The switch circuit is also used to control the first battery and the second battery to be connected in parallel when the first battery and the second battery are discharged according to the control signal.

The control circuit can send a control signal to the switch circuit, and the switch circuit can control the first battery and the second battery to be connected in series or in parallel according to the received control signal. When the first battery and the second battery are being charged, the control circuit may send a first control signal to the switch circuit, and the switch circuit may control the first battery and the second battery to be connected in series according to the first control signal. When the first battery and the second battery are discharged, the control circuit can send a second control signal to the switch circuit, and the switch circuit can control the first battery and the second battery to be connected in parallel according to the second control signal. The control circuit may be the processor 110, the charging management module 130, and/or the power management module 140 in FIG. 1. The first battery and the second battery may be the first battery and the second battery in FIG. 1. For other related descriptions, reference may be made to the description of FIG. 2, which will not be repeated here.

In one embodiment, the switch circuit may include three switches, namely: a first switch K ₁ , a second switch K ₂ , and a third switch K ₃ . among them:

The first battery includes a first terminal and a second terminal. The second battery includes a third terminal and a fourth terminal. One end of the first switch K ₁ is respectively coupled to the third terminal of the second battery and the charging interface. The first switch K ₁ The other end of the second switch K ₂ is respectively coupled to the control circuit and the first end of the first battery, one end of the second switch K ₂ is respectively coupled to the fourth end of the second battery and one end of the third switch K ₃ , and the other end of the second switch K ₂ has one end coupled to the first terminal of the first battery and a control circuit, the other end of the third switch K ₃ are coupled to a first reference signal and a second end connected to the first cell;

The switch circuit can connect the first battery and the second battery in series by controlling the first switch K _{1 to be} turned off, the second switch K _{2 to} turn on, and the third switch K _{3 to turn} off;

A first switching circuit by controlling the switch K ₁ is turned on, turned off the second switch and the third switch K ₂ K ₃ is turned on, so that the first battery and the second battery in parallel connection.

For the specific description of how the switch circuit controls the series connection or parallel connection of the first battery and the second battery through the three switches, reference may be made to the corresponding description in FIG. 2, and details are not repeated here.

In an embodiment, the charging control circuit may further include a voltage conversion circuit, and the voltage conversion circuit may be a step-down circuit. among them:

The voltage conversion circuit is respectively coupled to the switch circuit, the control circuit and the charging interface;

The voltage conversion circuit is used to convert the voltage of the charging interface and use the converted voltage to power the control circuit.

The voltage conversion circuit may be the USB interface 160 in FIG. 1. For the specific description of the voltage conversion circuit, refer to the corresponding description in Fig. 2, which is not repeated here.

In an embodiment, the switch circuit may further include a fourth switch K ₄ , wherein:

One end of the fourth switch K ₄ K is coupled to a first end of the switch _1, the other end of the fourth switch K ₄ are respectively coupled to the voltage conversion circuit and a charging interface;

The switch circuit is also used to control the connection between the charging interface and the first battery and the second battery according to the control signal.

For the specific description of the switch K ₄ , reference may be made to the corresponding description in FIG. 2, which will not be repeated here.

Among them, FIG. 4 can also be expanded from two batteries to three or more batteries. The expansion idea is the same as that of the charging control circuit shown in FIG. 3, and will not be repeated here.

The specific implementations described above further describe the purpose, technical solutions and beneficial effects of this application in detail. It should be understood that the above are only specific implementations of this application and are not intended to limit the scope of this application. The protection scope, any modification, equivalent replacement, improvement, etc. made on the basis of the technical solution of this application shall be included in the protection scope of this application.

Claims

An electronic device, which is characterized by comprising a charging interface, a control circuit, a first battery and a second battery coupled with each other, wherein:

The charging interface is used to couple a charger;

The first battery and the second battery are used to receive the charging current of the charger;

The control circuit is used to control that the first battery and the second battery are connected in series when the first battery and the second battery receive the charging current;

The control circuit is also used to control that the first battery and the second battery are connected in parallel when the first battery and the second battery are discharged.
The electronic device according to claim 1, wherein the electronic device further comprises a voltage conversion circuit, wherein:

The voltage conversion circuit is coupled to the control circuit and the charging interface;

The voltage conversion circuit is used to convert the voltage of the charging interface and use the converted voltage to supply power to the control circuit.
The electronic device according to claim 2, wherein the voltage conversion circuit is a step-down circuit.
The electronic device according to any one of claims 1-3, wherein the control circuit is specifically configured to:

When the charging interface is coupled to the charger and the conditions for series charging are met, the control circuit controls the first battery and the second battery to be connected in series to receive the charging current;

The conditions for series charging include at least one of the following:

The charging currents flowing to the first battery and the second battery are respectively greater than or equal to a second threshold;

The sum of the charging current flowing to the first battery and the second battery is greater than or equal to a third threshold;

The electric quantity of the first battery and the second battery are respectively greater than or equal to a fourth threshold;

The voltages of the first battery and the second battery are respectively greater than or equal to a fifth threshold;

The temperature of the first battery and the second battery are within a preset range; and/or

The temperatures of the charging paths of the first battery and the second battery are respectively within a preset range.
The electronic device according to any one of claims 1 to 4, wherein the control circuit is further used for when the first battery and the second battery are connected in series, when the condition of parallel connection is satisfied , Controlling the first battery and the second battery to switch from series connection to parallel connection;

The conditions for the parallel connection include at least one of the following:

The difference between the power of the first battery and the power of the second battery is greater than a sixth threshold;

The temperature of the first battery or the temperature of the second battery is greater than a seventh threshold;

The temperature of the charging path of the first battery or the temperature of the charging path of the second battery is greater than an eighth threshold;

The power of the first battery or the power of the second battery is greater than a ninth threshold;

The current flowing to the first battery or the current flowing to the second battery is less than the tenth threshold; and/or

The sum of the current flowing to the first battery and the current flowing to the second battery is less than the eleventh threshold.
The electronic device according to any one of claims 1-5, wherein the electronic device further comprises a first switch, a second switch and a third switch, wherein:

The first battery includes a first terminal and a second terminal, the second battery includes a third terminal and a fourth terminal, the first terminal of the first battery is coupled to the control circuit, and the first battery The second terminal of the second battery is connected to the first reference signal, the third terminal of the second battery is coupled to the control circuit through the first switch, and the third terminal of the second battery is coupled to the charging interface, The fourth terminal of the second battery is coupled to the first terminal of the first battery through the second switch, and the fourth terminal of the second battery is connected to the first reference signal through the third switch Coupling

The control circuit controls the first switch to turn off, the second switch to turn on, and the third switch to turn off, so that the first battery and the second battery are connected in series;

The control circuit controls the first switch to turn on, the second switch to turn off, and the third switch to turn on, so that the first battery and the second battery are connected in parallel.
The electronic device according to claim 6, wherein the electronic device further comprises a fourth switch, wherein:

The third terminal of the second battery is coupled to the charging interface through the fourth switch;

The control circuit is also used to control the connection of the charging interface with the first battery and the second battery by controlling the working state of the fourth switch.
The electronic device according to claim 6 or 7, wherein the first reference signal is a reference ground signal.
A charging control circuit, characterized in that the charging control circuit is applied to an electronic device, the electronic device includes a first battery and a second battery; the charging control circuit includes a coupled control circuit and a switch circuit, wherein:

The control circuit is used to control the working state of the switch circuit;

The switch circuit is configured to respond to a first control signal of the control circuit, and the switch circuit works in a first working state, so that when the first battery and the second battery receive charging current, the The first battery and the second battery are connected in series;

The switch circuit is also used to respond to the second control signal of the control circuit, the switch circuit works in a second working state, so that when the first battery and the second battery are discharged, the first The battery is connected in parallel with the second battery.
The charging control circuit according to claim 9, wherein the charging control circuit further comprises a voltage conversion circuit, wherein:

The voltage conversion circuit is respectively coupled to the switch circuit and the control circuit;

The voltage conversion circuit is used to convert the voltage of the charging interface of the electronic device, and use the converted voltage to supply power to the control circuit.
The charging control circuit according to claim 10, wherein the voltage conversion circuit is a step-down circuit.
The charging control circuit according to any one of claims 9-11, wherein the switch circuit is specifically used for:

When the charging interface of the electronic device is coupled to the charger and the conditions for series charging are met, the switch circuit controls the first battery and the second battery to be connected in series to receive the charging current;

The conditions for series charging include at least one of the following:

The charging currents flowing to the first battery and the second battery are respectively greater than or equal to a second threshold;

The sum of the charging current flowing to the first battery and the second battery is greater than or equal to a third threshold;

The electric quantity of the first battery and the second battery are respectively greater than or equal to a fourth threshold;

The voltages of the first battery and the second battery are respectively greater than or equal to a fifth threshold;

The temperature of the first battery and the second battery are within a preset range; and/or

The temperatures of the charging paths of the first battery and the second battery are respectively within a preset range.
The charging control circuit according to any one of claims 9-12, wherein the switch circuit is further used for when the first battery and the second battery are connected in series, when the condition of parallel connection is satisfied When, controlling the first battery and the second battery to switch from series connection to parallel connection;

The conditions for the parallel connection include at least one of the following:

The difference between the power of the first battery and the power of the second battery is greater than a sixth threshold;

The temperature of the first battery or the temperature of the second battery is greater than a seventh threshold;

The temperature of the charging path of the first battery or the temperature of the charging path of the second battery is greater than an eighth threshold;

The power of the first battery or the power of the second battery is greater than a ninth threshold;

The current flowing to the first battery or the current flowing to the second battery is less than the tenth threshold; and/or

The sum of the current flowing to the first battery and the current flowing to the second battery is less than the eleventh threshold.
The charging control circuit according to any one of claims 9-13, wherein the switch circuit comprises a first switch, a second switch and a third switch, wherein:

The first battery includes a first terminal and a second terminal, the second battery includes a third terminal and a fourth terminal, and one end of the first switch is respectively coupled to the third terminal of the second battery and the Charging interface, the other end of the first switch is respectively coupled to the control circuit and the first end of the first battery, and one end of the second switch is respectively coupled to the fourth end of the second battery and the first end One end of the third switch, the other end of the second switch is respectively coupled to the control circuit and the first end of the first battery, and the other end of the third switch is respectively coupled to the first end of the first battery The second end and the first reference signal;

The switch circuit controls the first switch to turn off, the second switch to turn on, and the third switch to turn off, so that the first battery and the second battery are connected in series;

The switch circuit controls the first switch to turn on, the second switch to turn off, and the third switch to turn on, so that the first battery and the second battery are connected in parallel.
The charging control circuit according to claim 14, wherein the switch circuit further comprises a fourth switch, wherein:

One end of the fourth switch is coupled to one end of the first switch, and the other end of the fourth switch is respectively coupled to the charging port;

The switch circuit is also used to control the connection of the charging interface with the first battery and the second battery according to the control signal.
The charging control circuit according to claim 14 or 15, wherein the first reference signal is a reference ground signal.