WO2022199211A1

WO2022199211A1 - Charging circuit, charging chip, and electronic device

Info

Publication number: WO2022199211A1
Application number: PCT/CN2022/070378
Authority: WO
Inventors: 邱钰鹏; 周海滨; 何忠勇
Original assignee: 荣耀终端有限公司
Priority date: 2021-03-23
Filing date: 2022-01-05
Publication date: 2022-09-29
Also published as: CN115117951A

Abstract

The present application provides a charging circuit, a charging chip, and an electronic device. The present application can solve the problem in an electronic device using two batteries that one of the batteries cannot be fully charged, resulting in relatively small available capacity of the batteries of the electronic device. The charging circuit comprises a voltage converter, a controller, a first switching element, and a second switching element. A first end of the first switching element is used for being coupled to a first battery, and a first end of the second switching element is used for being coupled to a second battery. A second end of the first switching element and a second end of the second switching element are both coupled to a first end of the voltage converter to charge the first battery and the second battery. A second end of the voltage converter is used for being couple to a power adapter. In this way, charging currents of the first battery and the second battery can be controlled by means of the first switching element and the second switching element respectively, so that both the first battery and the second battery can be fully charged, thereby improving the available capacity of the batteries in the electronic device, and improving the service performance of the batteries.

Description

Charging circuit, charging chip and electronic equipment

This application claims the priority of the Chinese patent application with the application number 202110310820.0 and the invention name "Dual Battery Isolation Charge-Discharge Circuit" submitted to the State Intellectual Property Office on March 23, 2021, and submitted to the state on July 30, 2021 Intellectual Property Office, the priority of the Chinese patent application with application number 202110875500.X and the invention title of "charging circuit, charging chip and electronic device", the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the technical field of charging and discharging of electronic devices, and in particular, to a charging circuit, a charging chip and an electronic device.

Background technique

At present, in order to realize fast charging of electronic devices, electronic devices generally use dual batteries to power the electronic devices. The dual-battery charging and discharging circuit can be divided into series charging and discharging (that is, two batteries are charged and discharged in series), series charging and discharging (that is, two batteries are charged and discharged in parallel), and parallel charging and discharging (that is, two batteries are charged and discharged in parallel). The batteries are charged in parallel and discharged in parallel) in several different situations. Among them, the series charge and series discharge loss is large. Serial charging and discharging need to change the form of the dual batteries, and the control is complicated. The control of parallel charging and discharging is simple and does not need to change the shape of the dual battery.

However, in the current electronic equipment using a dual-battery charge-discharge circuit, due to the possible difference in the capacity of the two batteries and the existence of path impedance, there may be a situation where one of the two batteries cannot be fully charged , thereby causing the problem that the available capacity of the battery of the electronic device is small.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a charging circuit, a charging chip, and an electronic device, which can solve the problem that one of the batteries in an electronic device using dual batteries cannot be fully charged, resulting in a small available battery capacity of the electronic device.

To achieve the above object, the application adopts the following technical solutions:

In a first aspect, an embodiment of the present application provides a charging circuit. The charging circuit includes a voltage converter, a controller, a first switching element and a second switching element. The first end of the first switching element is used for coupling with the first battery, and the first end of the second switching element is used for coupling with the second battery. The second terminal of the first switching element and the second terminal of the second switching element are each coupled to the first terminal of the voltage converter to charge the first battery and the second battery. The second end of the voltage conversion circuit is used for coupling with the power adapter. The controller is coupled to the first battery and the second battery to detect the voltage of the first battery and the voltage of the second battery, and output the first control signal and the second control signal according to the voltage difference between the first battery and the second battery. The controller is also coupled to the first switching element for controlling the first switching element to be in an on state, a partial on state or an off state through the first control signal. The controller is also coupled to the second switching element for controlling the second switching element to be in an on state, a partial on state or an off state through the second control signal.

Based on the above charging circuit, when the above charging circuit is applied to the charging scene of an electronic device, the charging currents of the first battery and the second battery can be controlled respectively through the first switching element and the second switching element in the charging circuit, so as to avoid the first The parameters of the battery and the second battery (such as cut-off voltage) are inconsistent or the impedance of the charging path (such as the charging path formed by the charging circuit to the first battery) is unbalanced, resulting in a problem that a battery cannot be fully charged, so that the first battery and the second battery cannot be fully charged. Both batteries can reach a fully charged state, so as to increase the available capacity of the battery in the electronic device and improve the use performance of the battery.

In a possible implementation, when the first battery and the second battery are in a charged state, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than If the threshold is preset, the first control signal is used to control the conduction of the first switching element to charge the first battery; the second control signal is used to control the incomplete conduction of the second switching element to charge the second battery. In this case, the second switch element is equivalent to a variable resistance resistor, which can pull a larger current, so that the second battery can also be charged through the voltage converter, and the larger load can be pulled through the second switch element. The current of the second battery is adjusted to increase the voltage of the second battery, so as to reduce the voltage difference between the first battery and the second battery.

In a possible implementation, when the first battery and the second battery are in a charged state, if the voltage of the second battery is higher than the voltage of the first battery, and the voltage difference between the first battery and the second battery is greater than If the threshold value is preset, the first control signal is used to control the first switching element to not be fully turned on, so that the first battery is voltage-regulated and charged; the second control signal is used to control the conduction of the second switching element to charge the second battery. In this case, the first switching element is equivalent to a variable resistance resistor, which can pull a larger current, so that the charging circuit can charge the first battery through the voltage converter, and pull the load through the first switching element. When a larger current is used, the voltage of the first battery is adjusted to increase the voltage of the first battery, so as to reduce the voltage difference between the first battery and the second battery.

In a possible implementation, when the first battery and the second battery are in a charged state, if the voltage difference between the first battery and the second battery is less than or equal to a preset threshold, the first control signal is used to control the The first switching element is turned on to charge the first battery; the second control signal is used to control the conduction of the second switching element to charge the second battery. At this time, the paths from the charging circuit to the first battery and the second battery are both open, and the charging circuit can respectively charge the first battery and the second battery through the voltage converter.

In a possible implementation manner, both the second terminal of the first switching element and the second terminal of the second switching element are also used for coupling with the working circuit, so as to discharge the first battery and the second battery. When the charging circuit is used in the discharge scenario of the first battery and the second battery, the controller of the charging circuit is further used to detect the voltage of the first battery and the voltage of the second battery, and according to the first battery and the second battery The pressure difference outputs the first control signal and the second control signal. The first control signal is also used to control the first switching element to be in an off state. The second control signal is also used to control the second switching element to be in an off state.

In a possible implementation manner, when the first battery and the second battery are in a discharged state, the battery with a larger voltage among the first battery and the second battery may supply power to the working circuit first, and wait for the first battery and the second battery to supply power to the working circuit. After the voltage difference of the second battery is reduced, both the first battery and the second battery supply power to the working circuit, so as to avoid the large voltage difference between the first battery and the second battery, which may lead to high current mutual charging, burn the device or damage the battery The phenomenon.

Specifically, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the first control signal is used to control the first switching element to be turned on, so that the The first battery supplies power to the working circuit; the second control signal is used to control the second switching element to be turned off, so that the second battery does not supply power to the working circuit.

If the voltage of the second battery is higher than the voltage of the first battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the first control signal is used to control the first switching element to turn off, so that the first battery does not operate supply power to the working circuit; the second control signal is used to control the conduction of the second switch element, so that the second battery supplies power to the working circuit.

If the voltage difference between the first battery and the second battery is less than or equal to the preset threshold, the first control signal is used to control the conduction of the first switching element, so that the first battery supplies power to the working circuit; the second control signal is used to control the first switching element to be turned on. The two switching elements are turned on, so that the second battery supplies power to the working circuit.

In a possible implementation manner, when the first battery and the second battery are in a discharged state, the battery with a lower voltage among the first battery and the second battery can supply power to the working circuit first, while the first battery and the second battery are in a state of discharge. The battery with the larger voltage in the second battery is in a voltage regulation state; when the voltage difference between the first battery and the second battery is reduced, both the first battery and the second battery supply power to the working circuit, so as to avoid the first battery and the second battery. The voltage difference between the two batteries is large, which leads to a large current charging each other, resulting in the phenomenon of burning the device or damaging the battery.

Specifically, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than a preset threshold, the first control signal is used to control the first switching element not to be fully turned on , so that the first battery supplies power to the working circuit and regulates the voltage; the first control signal is used to control the conduction of the second switching element, so that the second battery supplies power to the working circuit.

If the voltage of the second battery is higher than the voltage of the first battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the first control signal is used to control the conduction of the first switching element, so that the first battery is turned on. The working circuit supplies power; the second control signal is used to control the second switching element not to be completely turned on, so that the second battery supplies power to the working circuit and regulates the voltage.

In a possible implementation manner, the controller includes a drive circuit and a voltage detection circuit; the voltage detection circuit is used for coupling with the first battery to detect the voltage of the first battery. The voltage detection circuit is further coupled to the second battery to detect the voltage of the second battery. The drive circuit is coupled to the voltage detection circuit for acquiring the voltage of the first battery and the voltage of the second battery. The first output terminal of the driving circuit is used for outputting the first control signal, and is coupled with the control terminal of the first switching element. The second output terminal of the driving circuit is used for outputting the second control signal and is coupled with the control terminal of the second switching element.

It should be understood that the above-mentioned controller is implemented by hardware structures such as a drive circuit and a voltage detection circuit, and the response speed of the controller is faster, which can effectively avoid the instantaneous high current generated at the moment of switching the control signal. damage, thereby making the charging circuit more reliable.

In a possible implementation manner, the controller is further configured to connect to a communication control bus, and the communication control bus is used to control the controller to perform voltage detection and output the first control signal and the second control signal. It should be understood that, since the above-mentioned controller is implemented by hardware circuit structures such as a drive circuit and a voltage detection circuit, the working state of the controller can be controlled and data detection can be performed through a communication control bus (eg, I2C bus).

In a second aspect, an embodiment of the present application provides a charging chip. The charging chip is applied to electronic equipment. The electronic device includes a first battery, a second battery and a working circuit. The charging chip includes: a first interface, a second interface, a third interface, a fourth interface, and a charging circuit in any possible implementation manner of the above first aspect. Wherein, the first interface is used for coupling the power adapter and the second end of the voltage conversion circuit. The second interface is used for coupling the second terminal of the first switching element, the second terminal of the second switching element, the first terminal of the voltage conversion circuit, and the working circuit. The third interface is used for coupling the first battery; the fourth interface is used for coupling the second battery.

In a possible implementation manner, the charging chip further includes a communication control interface, and the communication control interface is used for coupling the communication control bus and the controller.

In a third aspect, an embodiment of the present application provides an electronic device. The electronic device includes a first battery, a second battery, a working circuit, and a charging chip in any possible implementation manner of the above second aspect. Wherein, the first battery is coupled with the third interface of the charging chip to supply power to the working circuit. The second battery is coupled to the fourth interface of the charging chip to supply power to the working circuit.

In a fourth aspect, the embodiments of the present application provide another electronic device. The electronic device includes a power supply battery, a working circuit, and a charging chip in any possible implementation manner of the second aspect above. Wherein, the power supply battery includes a first positive electrode and a second positive electrode. The first positive electrode is coupled with the third interface of the charging chip to supply power to the working circuit. The second positive electrode is coupled to the fourth interface of the charging chip to supply power to the working circuit.

In a fifth aspect, an embodiment of the present application provides a method for controlling a charging circuit. The control method is applicable to the charging circuit in any possible implementation manner of the above first aspect. The above control method includes: the controller detects the voltage of the first battery and the voltage of the second battery. The controller outputs the first control signal and the second control signal according to the pressure difference between the first battery and the second battery. The first control signal controls the first switching element to be in a conducting, incompletely conducting or off state, and the second control signal controls the second switching element to be in a conducting, incompletely conducting or off state.

In a possible implementation manner, the first control signal controls the first switching element to be in an on state, not fully on or off, and the second control signal controls the second switch element to be on, not fully on or off The off state includes: when the first battery and the second battery are in the charging state, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than a preset threshold, Then, the first control signal is used to control the conduction of the first switch element to charge the first battery; the second control signal is used to control the second switch element to not be fully turned on, so that the voltage of the second battery is regulated and charged.

In a possible implementation manner, the first control signal controls the first switching element to be in an on state, not fully on or off, and the second control signal controls the second switch element to be on, not fully on or off The off state includes: when the first battery and the second battery are in the charging state, if the voltage of the second battery is higher than the voltage of the first battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, Then, the first control signal is used to control the first switching element to be not fully turned on, so that the first battery is charged and voltage-regulated; the second control signal is used to control the second switching element to be turned on, so that the second battery is charged.

In a possible implementation, when the first battery and the second battery are in a charged state, if the voltage difference between the first battery and the second battery is less than or equal to a preset threshold, the first control signal is used to control the The first switching element is turned on to charge the first battery; the second control signal is used to control the conduction of the second switching element to charge the second battery.

In a possible implementation manner, both the second terminal of the first switching element and the second terminal of the second switching element are also used for coupling with the working circuit, so as to discharge the first battery and the second battery. The first control signal controls the first switching element to be in a conducting state, an incomplete conducting state or an off state, and the second control signal controls the second switching element to be in a conducting state, an incomplete conducting state or an off state, including: in the first battery When the battery and the second battery are in a discharge state, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the first control signal is used to control the second battery. A switch element is turned on to make the first battery supply power to the working circuit; the second control signal is used to control the second switch element to be turned off, so that the second battery does not supply power to the working circuit.

In a possible implementation manner, both the second terminal of the first switching element and the second terminal of the second switching element are also used for coupling with the working circuit, so as to discharge the first battery and the second battery. The first control signal controls the first switching element to be in a conducting state, an incomplete conducting state or an off state, and the second control signal controls the second switching element to be in a conducting state, an incomplete conducting state or an off state, including: in the first battery When the battery and the second battery are in a discharge state, if the voltage of the second battery is higher than the voltage of the first battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the first control signal is used to control the first battery. A switch element is turned off, so that the first battery does not supply power to the working circuit; the second control signal is used to control the second switching element to be turned on, so that the second battery supplies power to the working circuit.

In a possible implementation manner, both the second terminal of the first switching element and the second terminal of the second switching element are also used for coupling with the working circuit, so as to discharge the first battery and the second battery. The first control signal controls the first switching element to be in a conducting state, an incomplete conducting state or an off state, and the second control signal controls the second switching element to be in a conducting state, an incomplete conducting state or an off state, including: in the first battery When the battery and the second battery are in a discharge state, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the first control signal is used to control the second battery. A switch element is not fully turned on, so that the first battery supplies power to the working circuit and regulates the voltage; the first control signal is used to control the conduction of the second switch element, so that the second battery supplies power to the working circuit.

In a possible implementation manner, both the second terminal of the first switching element and the second terminal of the second switching element are also used for coupling with the working circuit, so as to discharge the first battery and the second battery. The first control signal controls the first switching element to be in a conducting state, an incomplete conducting state or an off state, and the second control signal controls the second switching element to be in a conducting state, an incomplete conducting state or an off state, including: in the first battery When the battery and the second battery are in a discharge state, if the voltage of the second battery is higher than the voltage of the first battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the first control signal is used to control the first battery. A switch element is turned on to make the first battery supply power to the working circuit; the second control signal is used to control the second switch element not to be fully turned on, so that the second battery supplies power to the working circuit and regulates the voltage.

In a possible implementation manner, both the second terminal of the first switching element and the second terminal of the second switching element are also used for coupling with the working circuit, so as to discharge the first battery and the second battery. The first control signal controls the first switching element to be in a conducting state, an incomplete conducting state or an off state, and the second control signal controls the second switching element to be in a conducting state, an incomplete conducting state or an off state, including: in the first battery When the battery and the second battery are in the discharge state, if the voltage difference between the first battery and the second battery is less than or equal to the preset threshold, the first control signal is used to control the conduction of the first switching element to make the first battery work The circuit supplies power; the second control signal is used to control the conduction of the second switch element, so that the second battery supplies power to the working circuit.

In a sixth aspect, the embodiments of the present application provide yet another electronic device. The electronic device includes a first battery, a second battery, a charging circuit and a working circuit. Wherein, the first battery and the second battery are coupled with the working circuit through the charging circuit. When the electronic device is in operation, the charging circuit is configured to perform the method in any of the possible implementations of the fifth aspect above.

It can be understood that any of the control methods, charging chips, and electronic devices provided above for any charging circuit can be implemented by the corresponding charging circuits provided above, or related to the corresponding charging circuits provided above. Therefore, for the beneficial effects that can be achieved, reference may be made to the beneficial effects in the charging circuit provided above, which will not be repeated here.

Description of drawings

FIG. 1 is a schematic structural diagram 1 of an electronic device with dual batteries charging and discharging simultaneously;

FIG. 2 is a second structural schematic diagram of an electronic device with dual batteries charging and discharging simultaneously;

FIG. 3 is a schematic structural diagram 1 of an electronic device including a charging circuit according to an embodiment of the present application;

FIG. 3A is a first waveform diagram of a first control signal and a second control signal provided by an embodiment of the application;

3B is an equivalent circuit diagram of the circuit diagram shown in FIG. 3 using the waveform diagram of FIG. 3A ;

FIG. 3C is a second waveform diagram of the first control signal and the second control signal provided by the embodiment of the application;

FIG. 3D is an equivalent circuit diagram of the circuit diagram shown in FIG. 3 using the waveform diagram of FIG. 3C ;

FIG. 3E is a third waveform diagram of the first control signal and the second control signal provided by the embodiment of the application;

FIG. 3F is an equivalent circuit diagram of the circuit diagram shown in FIG. 3 using the waveform diagram of FIG. 3E ;

3G is a fourth waveform diagram of the first control signal and the second control signal provided by the embodiment of the application;

FIG. 3H is an equivalent circuit diagram of the circuit diagram shown in FIG. 3 using the waveform diagram of FIG. 3G ;

3I is a waveform diagram 5 of the first control signal and the second control signal provided by the embodiment of the application;

3J is an equivalent circuit diagram of the circuit diagram shown in FIG. 3 using the waveform diagram of FIG. 3I;

FIG. 4 is a second schematic structural diagram of an electronic device including a charging circuit according to an embodiment of the present application;

FIG. 5 is a flowchart of a method for controlling a charging circuit provided by an embodiment of the present application;

6 is a flowchart of a charging and discharging method of an electronic device including a charging circuit provided by an embodiment of the present application;

FIG. 7 is a third schematic structural diagram of an electronic device including a charging circuit according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a charging chip according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

Hereinafter, the terms "first", "second", etc. are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of this application, unless stated otherwise, "plurality" means two or more.

In addition, in this application, the terms "upper", "lower", "left", "right" and other orientations may include, but are not limited to, the orientations relative to the schematic placement of the components in the drawings. It should be understood that these orientations The terminology can be a relative concept, and they are used for relative description and clarification, which can change correspondingly according to the change of the orientation in which the components are placed in the drawings.

In this application, unless otherwise expressly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or an integrated body; it may be directly connected, or Can be indirectly connected through an intermediary. Additionally, the terms "coupled," "coupled," or "coupled" may be means of electrical connections that enable signal transmission.

FIG. 1 is a schematic structural diagram 1 of an electronic device with dual batteries charged and discharged simultaneously. As shown in FIG. 1 , the electronic device includes a charging circuit, a working circuit, a first battery and a second battery. Wherein, the first battery and the second battery can be coupled with the power adapter through a charging circuit, and the first battery and the second battery can also be coupled with the working circuit through the charging circuit.

When the two batteries are charged in parallel, the power adapter converts the 220-volt commercial power into direct current through the AC-DC converter, and charges the first battery and the second battery. When the two batteries are discharged in parallel, the first battery and the second battery supply power to the working circuit. Wherein, the working circuit may include a processor, a memory, a communication interface, etc., and the working circuit may also be a power management integrated circuit (power management IC, PMIC), or a system on a chip (system on a chip, SoC). There are no special restrictions on the example.

FIG. 2 is a second structural schematic diagram of an electronic device with dual-battery charging and discharging. As shown in FIG. 2 , the first battery and the second battery in the electronic device can also use two independent charge pump chips to charge the first battery and the second battery respectively, so as to quickly charge the first battery and the second battery. charging to increase the speed of charging. Specifically, the above electronic device further includes a first charge pump chip and a second charge pump chip. Wherein, one end of the first charge pump chip is coupled with the output end Vbus of the power adapter, and the other end of the first charge pump chip is coupled with the first battery. One end of the second charge pump chip is coupled to the output end Vbus of the power adapter, and the other end of the first charge pump chip is coupled to the second battery.

It should be noted that, in the electronic device shown in FIG. 1 and FIG. 2 , the power adapter simultaneously charges the first battery and the second battery through a charging circuit, or uses a charge pump chip to charge the first battery and the second battery. Due to inconsistent parameters (such as cut-off voltage) of the first battery and the second battery, and the existence of the path impedance, there may be a situation where one of the first battery and the second battery cannot be fully charged, thus causing the battery of the electronic device to be usable. Smaller capacity issues.

In order to solve the above problems, the embodiment of the present application provides a charging circuit applied to the electronic equipment in the above-mentioned FIG. 1 and FIG. 2 . The charging voltage is adjusted so that both batteries of different capacities can be fully charged, thereby increasing the usable capacity of the battery of the electronic device.

As shown in FIG. 3 , the above charging circuit includes a voltage converter, a controller, a first switching element Q1 and a second switching element Q2. The first end of the first switching element Q1 is used for coupling with the first battery, and the first end of the second switching element Q2 is used for coupling with the second battery. The second terminal of the first switching element Q1 and the second terminal of the second switching element Q2 are both coupled to the first terminal of the voltage converter, so that the voltage converter charges the first battery and the second battery. The second end of the voltage conversion circuit is used for coupling with the power adapter, and is used for obtaining the direct current Vbus output by the power adapter.

Wherein, the voltage converter can convert the direct current Vbus output from the power adapter into the direct current (Vsys voltage shown in FIG. 1 ) suitable for the working circuit of the electronic device. The voltage converter may be a DC-DC conversion circuit (eg, a buck circuit) or a DC-DC conversion chip (eg, a buck chip) and other circuits that perform DC voltage conversion, which are not specifically limited in this application. The first switching element Q1 and the second switching element Q2 may be devices with switching functions such as metal-oxide-semiconductor field-effect transistor (MOSFET). For example, both the first switching element Q1 and the second switching element Q2 may be an N-type MOS transistor or a P-type MOS transistor. The first end of the first switching element Q1 may be the source (source, S) of the MOS transistor, or the drain (drain, D) of the MOS transistor; the second end of the first switching element Q1 may be the source (source, S) of the MOS transistor. The drain can also be the source of the MOS transistor. Correspondingly, the first end of the second switching element Q2 may be the source of the MOS transistor or the drain of the MOS transistor; the second end of the second switching element Q2 may be the drain of the MOS transistor or the MOS transistor source of the tube. The control terminal of the first switching element Q1 and the control terminal of the second switching element Q2 may be the gate (gate, G) of the MOS transistor.

The above-mentioned controller is used for coupling with the first battery and the second battery to detect the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery, and output the first control signal and the second battery according to the voltage difference between the first battery and the second battery control signal. The above-mentioned controller is also coupled to the control terminal of the first switching element Q1 for outputting a first control signal to the first switching element Q1, and controlling the first switching element Q1 to be in a conducting state or an incomplete conducting state through the first control signal , so that the first battery is in a state of charge or voltage regulation. The above-mentioned controller is also coupled to the control terminal of the second switching element Q2 for outputting a second control signal to the second switching element Q2, and controlling the second switching element Q2 to be in a conducting or incompletely conducting state through the second control signal , so that the second battery is in a state of charge or voltage regulation.

Specifically, the above-mentioned controller may include a drive circuit and a voltage detection circuit. The voltage detection circuit is used for coupling with the first battery to detect the voltage Vbat1 of the first battery. The voltage detection circuit is also used for coupling with the second battery to detect the voltage Vbat2 of the second battery.

The drive circuit is coupled to the voltage detection circuit, and is used to obtain the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery from the voltage detection circuit, and output the first control signal and the second battery according to the voltage difference between the first battery and the second battery. The control signal is used to control the first switching element Q1 and the second switching element Q2 to be in a conducting state or an incomplete conducting state.

The driving circuit includes two output terminals, wherein the first output terminal of the driving circuit is used for outputting the first control signal and is coupled with the control terminal of the first switching element Q1, so that the first control signal controls the first switching element Q1 in a conducting or incompletely conducting state. The second output terminal of the driving circuit is used for outputting the second control signal, and is coupled to the control terminal of the second switching element Q2, so that the second control signal controls the second switching element Q2 to be in a conducting state or an incomplete conducting state.

Since the above-mentioned controller is implemented by hardware circuit structures such as a drive circuit and a voltage detection circuit, in order to control the working state of the controller and perform data detection, the above-mentioned controller is also connected to a communication control bus, such as an integrated circuit interconnect (inter-integrated circuit, I2C) bus, the I2C bus can be used to control the voltage detection circuit of the controller to perform voltage detection, and can also control the voltage detection circuit to output the first control signal and the second control signal.

It should be understood that the above-mentioned controller may also be implemented by software, for example, a first detector (sensor1) may be coupled to a path where the first battery is located, and a second detector (sensor2) may be coupled to a path where the second battery is located. The first detector can detect the voltage Vbat1 of the first battery, and the second detector can detect the voltage Vbat2 of the second battery. The voltage detection control module may be coupled with the first detector and the second detector to obtain detection data of the first detector and the second detector, the detection data may include the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery Wait.

The controller may acquire the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery detected by the first detector, and output the first control signal and the first control signal according to the voltage difference between the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery. Two control signals, so that the first control signal controls the first switching element Q1 to be in a conducting state or an incompletely conducting state, and the second control signal controls the second switching element Q2 to be in a conducting state or an incompletely conducting state.

It should be noted that, compared with the controller implemented by software, the above controller is implemented by hardware structures such as drive circuit and voltage detection circuit, and the response speed of the controller is faster, which can effectively avoid the instantaneous high current generated at the moment of control signal switching. Damage to the device in the charging circuit or damage to the battery makes the charging circuit more reliable.

In the following, taking the first switching element Q1 and the second switching element Q2 as NMOS transistors as an example, how to control the first switching element Q1 and the second switching element Q2 to be turned on or off for the first control signal and the second control signal Status is explained in detail.

For the NMOS transistor, by controlling the gate voltage of the NMOS transistor, the NMOS transistor can be controlled to be turned on, incompletely turned on, or turned off, respectively. Therefore, for the first control signal to control the first switching element Q1 to be in a conducting state or a non-conducting state, and the second control signal to control the second switching element Q2 to be in a conducting state or a non-conducting state, the driving circuit can adjust the output of the first switching element. The duty cycle of a control signal is adjusted, and the duty cycle of the output second control signal is adjusted. The duty ratio refers to the time proportion of the high-level pulse in the entire pulse period in one pulse period. For example, the duty ratio of a control signal of a high-level pulse for 1 second and a low-level pulse for 1 second is 50%. Exemplarily, when the duty cycle of the first control signal is 100%, that is, when the first control signal is a continuous high-level signal, the first switching element Q1 is in an on state, and when the duty cycle of the control signal is less than When a certain value (such as 35%), the first switching element Q1 is in an off state, and when the duty cycle of the control signal is greater than a certain value (such as 35%) and less than 100%, the first switching element Q1 is in an incomplete conduction state. state. The same is true for the second control signal, which will not be repeated here.

It should be understood that the above-mentioned first control signal and second control signal may be pulse width modulation (pulse width modulation, PWM) signals output by a pulse power supply. Therefore, the above-mentioned drive circuit is provided with a pulse power supply.

When the above charging circuit is applied to the charging scene of the electronic device, that is, when the charging circuit charges the first battery and the second battery, the voltage detection circuit in the controller can detect the voltage Vbat1 of the first battery and the voltage of the second battery. voltage Vbat2. The drive circuit in the controller can obtain the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery from the voltage detection circuit, and compare the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery, according to the voltage of the first battery. The comparison result of the voltage Vbat1 and the voltage Vbat2 of the second battery outputs a first control signal and a second control signal, respectively.

Specifically, if the voltage of the first battery is greater than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than a preset threshold (denoted as Vth1), that is, Vbat1>Vbat2+Vth1, as shown in FIG. 3A , the first control signal is a continuous high-level signal, which can control the first switching element Q1 to conduct, so that the first switching element Q1 is in a fully conducting state; the second control signal is a duty cycle at a certain value (such as 35%). ) to 100%, such as a pulse signal with a duty cycle of 65% as shown in FIG. 3A , can control the second switching element Q2 to not be fully turned on, so that the first switching element Q1 is in a voltage regulation state. At this time, the above-mentioned FIG. 3 can form an equivalent circuit diagram as shown in FIG. 3B, that is, the path from the charging circuit to the first battery is opened, and the charging circuit can charge the first battery through the voltage converter; and the second switching element Q2 is equivalent to The variable resistance resistor R2 can pull a larger current, so it can also charge the second battery through the voltage converter, and adjust the second battery through the larger current pulled by the second switching element Q2. voltage to increase the voltage of the second battery to reduce the voltage difference between the first battery and the second battery.

Conversely, if the voltage of the first battery is lower than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, that is, Vbat1<Vbat2-Vth1, then as shown in FIG. 3C, the first control signal For a pulse signal with a duty ratio between a certain value (such as 35%) and 100%, such as a pulse signal with a duty ratio of 65% as shown in FIG. 3C, the first switching element Q1 can be controlled to not be fully turned on, so that The first switching element Q1 is in a voltage regulation state; the second control signal is a continuous high level signal, which can control the second switching element Q2 to be fully turned on, so that the first switching element Q1 is in a fully turned-on state. At this time, the above-mentioned FIG. 3 can form an equivalent circuit diagram as shown in FIG. 3D, that is, the first switching element Q1 is equivalent to a variable resistance resistor R1, which can pull a large current, so that the charging circuit can be converted by voltage. The device charges the first battery, and pulls a larger current through the first switching element Q1 to regulate the voltage of the first battery, so as to increase the voltage of the first battery to reduce the voltages of the first battery and the second battery difference, and the path of the charging circuit to the second battery is open, the charging circuit can charge the second battery through the voltage converter.

If the voltage difference between the first battery and the second battery is smaller than the preset threshold, that is, Vbat1≤Vbat2+Vth1 or Vbat1≥Vbat2-Vth1, as shown in FIG. 3E, the first control signal is a continuous high level signal, which can control The first switching element Q1 is completely turned on, so that the first switching element Q1 is in a completely conducting state; the second control signal is a continuous high level signal, which can control the second switching element Q2 to be completely turned on, so that the second switching element Q2 in a fully conducting state. At this time, the above-mentioned FIG. 3 can form an equivalent circuit diagram as shown in FIG. 3F, that is, the paths from the charging circuit to the first battery and the second battery are both open, and the charging circuit can respectively connect the first battery and the second battery through the voltage converter. Charge.

It should be understood that the above-mentioned preset threshold is preset according to the actual conditions of the first battery and the second battery, for example, the above-mentioned preset threshold may be 100mV.

In this way, when the above charging circuit is applied to the charging scene of an electronic device, the charging currents of the first battery and the second battery can be controlled by the first switching element Q1 and the second switching element Q2 in the charging circuit, respectively, so as to avoid the second battery. The parameters (such as cut-off voltage) of one battery and the second battery are inconsistent or the impedance of the charging path (such as the charging path formed by the charging circuit to the first battery) is unbalanced, which leads to the problem that a certain battery cannot be fully charged, so that the first battery and the first battery cannot be fully charged. Both the second batteries can be fully charged, so as to increase the available capacity of the battery in the electronic device and improve the use performance of the battery.

As another embodiment of the present application, the charging circuit shown in FIG. 3 can also be used in the discharge scenario of the first battery and the second battery, and the second end of the first switching element Q1 and the second switching element Q2 The second terminal can also be used to couple with the working circuit in the electronic device shown in FIG. 1 to discharge the first battery and the second battery and supply power to the working circuit in the electronic device.

When the charging circuit is used in the discharge scenario of the first battery and the second battery, the controller of the charging circuit is further used to detect the voltage of the first battery and the voltage of the second battery, and according to the first battery and the second battery The pressure difference outputs the first control signal and the second control signal. The first control signal is also used to control the first switching element Q1 to be in an off state. The second control signal is also used to control the second switching element Q2 to be in an off state.

The following describes in detail how the first control signal and the second control signal control the discharge of the first battery and the second battery by taking the first switching element Q1 and the second switching element Q2 as NMOS transistors as an example.

Similar to the charging scene of the electronic device, the voltage detection circuit in the controller can detect the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery in the whole discharging scene of the electronic device. The drive circuit in the controller can obtain the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery from the voltage detection circuit, and compare the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery, according to the voltage of the first battery. The comparison result of the voltage Vbat1 and the voltage Vbat2 of the second battery outputs a first control signal and a second control signal, respectively.

It should be understood that the specific control logic of the electronic device is different in the power-off state and the power-on state. The following is a case-by-case discussion:

When the electronic device is assembled or turned off, the charging circuit can isolate the first battery and the second battery, so as to prevent the large voltage difference between the first battery and the second battery from causing a large current to burn the device or damage the battery. Specifically, in the snap-fit assembly or shutdown state of the electronic device, a battery with a higher voltage can be used for power supply, or a battery with a lower voltage can be used for power supply.

The following is an example of using a battery with a larger voltage to supply power when the electronic device is in a shutdown state.

If the voltage Vbat1 of the first battery is higher than the voltage Vbat2 of the second battery, as shown in FIG. 3G , the first control signal is a continuous high level signal, which can control the first switching element Q1 to be turned on, so that the first switching element is turned on. Q1 is fully on. The second control signal is a continuous low level signal, which can control the second switching element Q2 to be turned off, so that the second switching element Q2 is in an off state. At this time, the above-mentioned FIG. 3 can form an equivalent circuit diagram as shown in FIG. 3H, that is, the path from the first battery to the working circuit is opened, the path from the second battery to the working circuit is closed, and the working circuit of the electronic device is connected from the first battery to the working circuit. powered by.

If the voltage Vbat1 of the first battery is lower than the voltage Vbat2 of the second battery, as shown in FIG. 3I, the first control signal is a continuous low level signal, which can control the first switching element Q1 to turn off, so that the first switching element Q1 is off. The second control signal is a continuous high level signal, which can control the second switching element Q2 to be turned on, so that the second switching element Q2 is in a fully turned-on state. At this time, the above-mentioned FIG. 3 can form an equivalent circuit diagram as shown in FIG. 3J, that is, the path from the first battery to the working circuit is closed, the path from the second battery to the working circuit is opened, and the second battery is connected to the working circuit of the electronic device. powered by.

In this way, the passage between the first battery and the second battery can be cut off, so as to avoid a large voltage difference between the first battery and the second battery causing high currents to charge each other, resulting in the phenomenon of burning the device or damaging the battery.

After the electronic device is turned on, in some embodiments, when the first battery and the second battery are in a discharged state, if the voltage difference between the first battery and the second battery is large, the first battery and the second battery The battery with the larger voltage in the battery supplies power to the working circuit. After the voltage difference between the first battery and the second battery is reduced, both the first battery and the second battery supply power to the working circuit, so as to avoid the first battery and the second battery. The large voltage difference leads to the mutual charging of large currents, resulting in the phenomenon of burning the device or damaging the battery. The specific control process is as follows:

If the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, that is, Vbat1>Vbat2+Vth1, the first control signal and the The second control signal makes the above-mentioned FIG. 3 form an equivalent circuit diagram as shown in FIG. 3H , that is, the first control signal is a continuous high-level signal, which can control the first switching element Q1 to be completely turned on, so that the first switching element is turned on. Q1 is in a fully conducting state, the path between the first battery and the working circuit is open, and the first battery can supply power to the working circuit. The second control signal is a continuous low level signal, which can control the second switching element Q2 to be turned off, so that the second switching element Q2 is in an off state, the path between the first battery and the working circuit is disconnected, and the second battery temporarily Do not supply power to operating circuits.

If the voltage of the first battery is lower than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, that is, Vbat1<Vbat2-Vth1, the first control signal and the second battery as shown in FIG. 3I can be used. 3 to form the equivalent circuit diagram shown in FIG. 3J, that is, the first control signal is a continuous low-level signal, which can control the first switching element Q1 to be turned off, so that the first switching element Q1 is in the In the off state, the path between the first battery and the working circuit is disconnected, and the first battery temporarily does not supply power to the working circuit. The second control signal is a continuous high-level signal, which can control the second switching element Q2 to be fully turned on, so that the second switching element Q2 is in a fully conductive state, the path between the first battery and the working circuit is opened, and the second battery Power can be supplied to the working circuit.

If the voltage difference between the first battery and the second battery is less than the preset threshold, that is, Vbat1≤Vbat2+Vth1 or Vbat1≥Vbat2-Vth1, the first control signal and the second control signal as shown in FIG. 3E can be used, and the above-mentioned FIG. 3 forms the equivalent circuit diagram as shown in FIG. 3F , that is, the first control signal is a continuous high level signal, which can control the first switching element Q1 to be completely turned on, so that the first switching element Q1 is in a fully turned-on state, and the first The path between a battery and the working circuit is opened, and the first battery can supply power to the working circuit. The second control signal is also a continuous high-level signal, which can control the second switching element Q2 to be fully turned on, so that the second switching element Q2 is in a fully conductive state, the path between the first battery and the working circuit is opened, and the second switching element Q2 is fully turned on. The battery can also supply power to the working circuit.

After the electronic device is turned on, in other embodiments, when the first battery and the second battery are in a discharged state, if the voltage difference between the first battery and the second battery is large, the first battery and the second battery The battery with the smaller voltage in the second battery supplies power to the working circuit, while the battery with the larger voltage in the first battery and the second battery is in a voltage regulation state; when the voltage difference between the first battery and the second battery is reduced, the first battery and the second battery Both the battery and the second battery supply power to the working circuit, so as to avoid a large voltage difference between the first battery and the second battery that leads to mutual charging of large currents, resulting in the phenomenon of burning the device or damaging the battery. The specific control process is as follows:

If the voltage of the first battery is higher than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, that is, Vbat1>Vbat2+Vth1, the first control signal and the The second control signal makes the above-mentioned FIG. 3 form an equivalent circuit diagram as shown in FIG. 3D, that is, the first control signal is a pulse signal with a duty ratio between a certain value (such as 35%) and 100%, which can control the first control signal. A switching element Q1 is not fully turned on, so that the first switching element Q1 is in a voltage regulation state. At this time, the first switching element Q1 can be equivalent to a variable resistance resistor R1, and the first battery can charge the second battery to adjust the voltage. The voltage of the first battery and the second battery. The second control signal is a continuous high-level signal, which can control the second switching element Q2 to be turned on, so that the second switching element Q2 is in a conducting state, the path between the first battery and the working circuit is opened, and the second battery is turned to work. circuit powered.

If the voltage of the first battery is lower than the voltage of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, that is, Vbat1<Vbat2-Vth1, the first control signal and the second battery as shown in FIG. 3A can be used. Two control signals, and make the above-mentioned FIG. 3 form an equivalent circuit diagram as shown in FIG. 3B, that is, the first control signal is a continuous high-level signal, which can control the first switching element Q1 to be turned on, so that the first switching element Q1 is in the In the conduction state, the path between the first battery and the working circuit is opened, and the first battery supplies power to the working circuit. The second control signal is a pulse signal with a duty ratio between a certain value (such as 35%) and 100%, which can control the second switching element Q2 to not be fully turned on, so that the second switching element Q2 is in a voltage regulation state, at this time The second switching element Q2 may be equivalent to a variable resistance resistor R2, and the first battery may charge the second battery to adjust the voltages of the first battery and the second battery.

If the voltage difference between the first battery and the second battery is less than the preset threshold, that is, Vbat1≤Vbat2+Vth1 or Vbat1≥Vbat2-Vth1, the first control signal and the second control signal as shown in FIG. 3E can be used, and the above-mentioned FIG. 3 forms the equivalent circuit diagram as shown in FIG. 3F , that is, the first control signal is a continuous high level signal, which can control the first switching element Q1 to be completely turned on, so that the first switching element Q1 is in a fully turned-on state, and the first The path between a battery and the working circuit is opened, and the first battery can supply power to the working circuit. The second control signal is a continuous high-level signal, which can control the second switching element Q2 to be fully turned on, so that the second switching element Q2 is in a fully conductive state, the path between the first battery and the working circuit is opened, and the second battery It is also possible to supply power to the working circuit.

In other embodiments, as shown in FIG. 4 , the first battery and the second battery of the electronic device can be charged either by the charging circuit shown in FIG. 3 , or by using two independent charge pump chips to charge the first battery respectively. and charge the second battery. Specifically, the above electronic device further includes a first charge pump chip and a second charge pump chip. One end of the first charge pump chip is coupled to the output end Vbus of the power adapter, and the other end of the first charge pump chip is coupled to the first battery. One end of the second charge pump chip is coupled to the output end Vbus of the power adapter, and the other end of the first charge pump chip is coupled to the second battery.

In the electronic device shown in FIG. 4 , when the first battery or the second battery meets the charging conditions of the charge pump chip, for example, the voltage of the first battery reaches 3.5V, the first charge pump chip can be used to charge the first battery. The voltage of the second battery reaches 3V, and the second charge pump chip can be used to charge the second battery.

In this case, in the above charging circuit, the voltage detection circuit in the controller can detect the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery. When the voltage Vbat1 of the first battery reaches 3.5V, the first control signal output by the driver in the controller can control the first switching element Q1 to be in an off state, the first battery stops using the charging circuit for charging, and uses the first charge The pump chip is charged. When the voltage Vbat2 of the second battery reaches 3V, the second control signal output by the driver in the controller can control the second switching element Q2 to be in an off state, the second battery stops using the charging circuit for charging, and uses the second charge The pump chip is charged. In this way, the above-mentioned electronic device can use the charge pump chip to rapidly charge the first battery and the second battery, so as to improve the charging speed.

When it is detected that the charging current of the first battery is small, such as less than the cut-off current of the first battery, if the voltage of the first battery has not reached the cut-off voltage, the controller in the above charging circuit can also output a first control signal, So as to control the first switching element Q1 to be in a conducting state, and continue to use the charging circuit to charge the first battery.

Correspondingly, when it is detected that the charging current of the second battery is small, such as less than the cut-off current of the second battery, if the voltage of the second battery has not reached the cut-off voltage, the controller in the above charging circuit can also output the second battery. The control signal is used to control the second switching element Q2 to be in an on state and continue to use the charging circuit to charge the second battery.

It should be understood that the charging current of the first battery can be detected by the first detector as shown in FIG. 4 , and the charging current of the second battery can be detected by the second detector as shown in FIG. 4 . Wherein, the first detector is arranged on the path where the first battery is located, and the second detector is arranged on the path where the second battery is located.

As shown in FIG. 5 , an embodiment of the present application further provides a control method of a charging circuit, and the control method of the charging circuit includes S501-S503.

S501, the controller detects the voltage of the first battery and the voltage of the second battery.

S502 , the controller outputs a first control signal according to the voltage difference between the first battery and the second battery, so as to control the first switching element Q1 to be turned on, not completely turned on, or turned off.

For the specific control process, please refer to the above-mentioned embodiment, which will not be repeated here.

S503 , the controller outputs a second control signal according to the voltage difference between the first battery and the second battery, so as to control the second switching element Q2 to be in an on state, an incomplete turn on state or an off state.

For the specific control process and technical effects, please refer to the above-mentioned embodiments, which will not be repeated here.

As shown in FIG. 6 , an embodiment of the present application further provides a charging and discharging control method for an electronic device. In the charging and discharging control method of the electronic device, when the electronic device is in a shutdown state, S601 is executed to enable the charging circuit to control the battery with a higher voltage among the first battery and the second battery to supply power to the working circuit of the electronic device. For example, if the voltage Vbat1 of the first battery is higher than the voltage Vbat2 of the second battery, the first battery supplies power to the working circuit of the electronic device. For another example, if the voltage Vbat1 of the first battery is lower than the voltage Vbat2 of the second battery, the second battery supplies power to the working circuit of the electronic device. For the specific control method, please refer to the description in the above-mentioned embodiment, which will not be repeated here.

After the electronic device is powered on, the first battery and the second battery in the electronic device are discharged, and the controller in the above charging circuit may execute S602 to compare the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery. Exemplarily, when the voltage Vbat1 of the first battery is higher than the voltage Vbat2 of the second battery, and the voltage difference between the first battery and the second battery is greater than a preset threshold, the above-mentioned charging circuit executes S603 to control the charging of the first battery to the electronic device. The working circuit is powered. When the voltage Vbat1 of the first battery is lower than the voltage Vbat2 of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the charging circuit executes S604 to control the second battery to supply power to the working circuit of the electronic device. When the voltage difference between the first battery and the second battery is less than or equal to the preset threshold, the above control circuit executes S605 to control both the first battery and the second battery to supply power to the working circuit.

After the first battery and the second battery are discharged, the user can connect the electronic device to the power adapter, and the electronic device, in response to the user's operation, executes S606 to make the first battery and the second battery in a charging state and charged by the above charging circuit. At this time, the controller in the above charging circuit may execute S607, compare the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery, and control the first battery according to the difference between the voltage Vbat1 of the first battery and the voltage Vbat2 of the second battery. Status of the first battery and the second battery. Exemplarily, when the voltage Vbat1 of the first battery is higher than the voltage Vbat2 of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the above-mentioned charging circuit executes S608 to control the first battery to be in a charging state, The second battery is in a voltage regulation state. When the voltage Vbat1 of the first battery is lower than the voltage Vbat2 of the second battery, and the voltage difference between the first battery and the second battery is greater than the preset threshold, the above charging circuit executes S609 to control the first battery to be in a voltage regulation state, and the second battery is charging. When the voltage difference between the first battery and the second battery is less than or equal to the preset threshold, the above control circuit executes S610 to control both the first battery and the second battery to be in a charging state.

During the charging process of the first battery and the second battery, the controller of the above charging circuit may further execute S611 to determine whether the voltage of the first battery satisfies the charging condition of the first charge pump chip. For example, it is assumed that the charging condition of the first charge pump chip is that the voltage Vbat1 of the first battery reaches 3.5V. When the voltage Vbat1 of the first battery reaches 3.5V, the controller of the above charging circuit controls the first switching element Q1 to be turned off, and executes S612 to charge the first battery from the first charge pump chip. Then, the above-mentioned charging chip may also execute S613 to determine whether the voltage of the first battery reaches the charging cut-off voltage. If the voltage of the first battery has reached the charge cut-off voltage, S619 is executed to cut off the charge of the first battery. During the process of charging the first battery by the first charge pump chip, if the charging current of the first battery is small, such as less than the cut-off current of the first battery, and the voltage of the first battery has not yet reached the cut-off voltage, the above-mentioned charging The controller in the circuit may also execute S617 to control the first switching element Q1 to be in an on state, and continue to use the charging circuit to charge the first battery.

During the charging process of the first battery and the second battery, the controller of the above charging circuit may also execute S614 to determine whether the voltage of the second battery satisfies the charging condition of the second charge pump chip. For example, it is assumed that the charging condition of the second charge pump chip is that the voltage Vbat2 of the second battery reaches 3V. When the voltage Vbat1 of the second battery reaches 3V, the controller of the charging circuit controls the second switching element Q2 to be turned off, and executes S615 to charge the second battery from the second charge pump chip. Then, the above-mentioned charging chip may also execute S616 to determine whether the voltage of the second battery reaches the charging cut-off voltage. If the voltage of the second battery has reached the charge cutoff voltage, execute S619 to cut off the second battery charge. During the process of charging the second battery by the second charge pump chip, if the charging current of the second battery is small, such as less than the cut-off current of the second battery, and the voltage of the second battery has not yet reached the cut-off voltage, the above charging The controller in the circuit may also execute S618 to control the second switching element Q2 to be in an on state, and continue to use the charging circuit to charge the second battery.

The embodiment of the present application further provides another electronic device. As shown in FIG. 7 , the electronic device includes a power supply battery, a working circuit and a charging circuit. The power supply battery includes two positive electrodes, respectively a first positive electrode and a second positive electrode, and a negative electrode. The structure of the charging circuit may adopt the structure of the charging circuit in the above-mentioned FIG. 3 or FIG. 4 .

The charging circuit includes a voltage converter, a controller, a first switching element Q1 and a second switching element Q2. The first end of the first switching element Q1 is used for coupling with the first positive electrode, and the first end of the second switching element Q2 is used for coupling with the second positive electrode. The second terminal of the first switching element Q1 and the second terminal of the second switching element Q2 are both coupled to the first terminal of the voltage converter, so that the voltage converter supplies power to the battery through the first positive electrode and the second positive electrode. The second end of the voltage conversion circuit is used for coupling with the power adapter, and is used for obtaining the direct current Vbus output by the power adapter.

The above-mentioned controller is used for coupling with the first positive electrode and the second positive electrode to detect the voltage of the first positive electrode and the voltage of the second positive electrode, and output the first control signal and the second control signal according to the voltage difference between the first positive electrode and the second positive electrode . The above-mentioned controller is also coupled with the control terminal of the first switching element Q1, and is used to control the first switching element Q1 to be in a conducting state or an incomplete conducting state through a first control signal, so that the first positive electrode is in a charging state or a voltage regulating state . The above-mentioned controller is also coupled with the control terminal of the second switching element Q2, and is used to control the second switching element Q2 to be in a conducting or incomplete conducting state through a second control signal, so that the second positive electrode is in a charging state or a voltage regulating state .

For the specific control process, reference may be made to the electronic devices shown in FIG. 3 and FIG. 4 , which will not be repeated here.

It should be understood that the technical effect of the electronic device shown in FIG. 7 may refer to the technical effect of the charging circuit shown in FIG. 3 , which will not be repeated here.

The embodiments of the present application further provide another electronic device. The electronic device includes a first battery, a second battery, a charging circuit and a working circuit. Wherein, the first battery and the second battery are coupled with the working circuit through the charging circuit. When the electronic device is in operation, the charging circuit is used to perform the method shown in Figure 5 above. It should be understood that for the technical effect of the electronic device, reference may be made to the technical effect of the electronic device shown in FIG. 3 and FIG. 4 , which will not be repeated here.

The embodiment of the present application also provides a charging chip. The charging chip can be applied to the electronic device shown in FIG. 1 above. The electronic device includes a first battery, a second battery and a working circuit. As shown in FIG. 8 , the charging chip includes a first interface, a second interface, a third interface, a fourth interface, and a charging circuit as shown in FIG. 3 .

Wherein, the first interface is used for coupling the power adapter and the second end of the voltage conversion circuit.

The second interface is used for coupling the second end of the first switching element, the second end of the second switching element, the first end of the voltage conversion circuit and the working circuit.

The third interface is used to couple the first battery. The fourth interface is used to couple the second battery.

Of course, if the controller in the above charging circuit is implemented by a drive circuit and a voltage detection circuit, the charging chip may further include a communication control interface for coupling a control bus (eg, I2C bus) and the controller.

It should be understood that for the technical effect of the above charging chip, reference may be made to the technical effect of the charging circuit shown in FIG. 3 , which will not be repeated here. In addition, encapsulating the charging circuit shown in FIG. 3 into a charging chip facilitates the assembly and wiring of electronic products, and can improve the integration degree of electronic devices.

To sum up, after the charging circuit or charging chip provided in the embodiments of the present application is applied to an electronic device, in the process of generating the electronic device, it can be assembled directly without considering the voltages of the first battery and the first battery, thereby improving production efficiency , reducing production costs. In addition, during the charging and discharging process of the electronic device, the voltage of the first battery and the second battery can be quickly balanced and isolated when the voltage difference between the first battery and the second battery is large, thereby improving the charging and discharging of the battery. performance, thereby improving the safety and reliability of batteries for electronic devices.

From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated as required. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. For the specific working process of the system, apparatus and unit described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

Each functional unit in each of the embodiments of the embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage The medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: flash memory, removable hard disk, read-only memory, random access memory, magnetic disk or optical disk and other media that can store program codes.

The above are only specific implementations of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the embodiments of the present application shall be covered by this within the protection scope of the application examples. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.

Claims

A charging circuit, comprising: a voltage converter, a controller, a first switching element and a second switching element;

The first end of the first switch element is coupled to the first battery, the first end of the second switch element is coupled to the second battery; the second end of the first switch element and the second end of the second switch element The second ends are all coupled with the first end of the voltage converter; the second end of the voltage converter circuit is coupled with the power adapter;

The controller is coupled with the first battery and the second battery, and is used for detecting the voltage of the first battery and the voltage of the second battery, and outputting a first control signal and a second control signal; the controller is connected to The first switching element is coupled for controlling the first switching element through the first control signal; the controller is also coupled with the second switching element for controlling the first switching element through the second control signal the second switching element.
The charging circuit according to claim 1, wherein when the first battery and the second battery are in a charging state, if the voltage of the first battery is higher than the voltage of the second battery , and the voltage difference between the first battery and the second battery is greater than a preset threshold, the first control signal is used to control the first switching element to be turned on, so that the first battery is charged; the The second control signal is used to control the second switching element to not be fully turned on, so that the second battery can be voltage-regulated and charged.
The charging circuit according to claim 1 or 2, wherein when the first battery and the second battery are in a charged state, if the voltage of the second battery is higher than that of the first battery voltage, and the voltage difference between the first battery and the second battery is greater than a preset threshold, the first control signal is used to control the first switching element not to be fully turned on, so that the first battery Voltage regulation charging; the second control signal is used to control the conduction of the second switch element to charge the second battery.
The charging circuit according to any one of claims 1 to 3, wherein when the first battery and the second battery are in a charged state, if the first battery and the second battery The voltage difference is less than or equal to a preset threshold, the first control signal is used to control the first switching element to be turned on, so that the first battery is charged; the second control signal is used to control the second The switching element is turned on to charge the second battery.
The charging circuit according to any one of claims 1 to 4, wherein the second end of the first switching element and the second end of the second switching element are both used for coupling with a working circuit, so as to The first battery and the second battery are discharged.
The charging circuit according to claim 5, wherein when the first battery and the second battery are in a discharge state, if the voltage of the first battery is higher than the voltage of the second battery , and the voltage difference between the first battery and the second battery is greater than a preset threshold, then the first control signal is used to control the first switching element to be turned on, so that the first battery is turned on to the working The circuit supplies power; the second control signal is used to control the second switch element to be turned off, so that the second battery does not supply power to the working circuit.
The charging circuit according to claim 5 or 6, wherein when the first battery and the second battery are in a discharge state, if the voltage of the second battery is higher than that of the first battery voltage, and the voltage difference between the first battery and the second battery is greater than a preset threshold, then the first control signal is used to control the first switching element to be turned off, so that the first battery is not connected to the The working circuit supplies power; the second control signal is used to control the conduction of the second switching element, so that the second battery supplies power to the working circuit.
The charging circuit according to claim 5, wherein when the first battery and the second battery are in a discharge state, if the voltage of the first battery is higher than the voltage of the second battery , and the voltage difference between the first battery and the second battery is greater than a preset threshold, then the first control signal is used to control the first switching element to not be fully turned on, so that the first battery is connected to all The working circuit supplies power and regulates the voltage; the first control signal is used to control the conduction of the second switching element, so that the second battery supplies power to the working circuit.
The charging circuit according to claim 5 or 8, wherein when the first battery and the second battery are in a discharge state, if the voltage of the second battery is higher than that of the first battery voltage, and the voltage difference between the first battery and the second battery is greater than a preset threshold, the first control signal is used to control the first switching element to be turned on, so that the first battery is connected to the desired voltage. The working circuit supplies power; the second control signal is used to control the second switching element not to be completely turned on, so that the second battery supplies power to the working circuit and regulates the voltage.
The charging circuit according to any one of claims 5 to 9, wherein when the first battery and the second battery are in a discharged state, if the first battery and the second battery The voltage difference is less than or equal to a preset threshold, the first control signal is used to control the first switching element to be turned on, so that the first battery supplies power to the working circuit; the second control signal is used to The second switch element is controlled to be turned on, so that the second battery supplies power to the working circuit.
The charging circuit according to any one of claims 1 to 10, wherein the controller comprises a driving circuit and a voltage detection circuit; the voltage detection circuit is used for coupling with the first battery to detect the the voltage of the first battery; the voltage detection circuit is further configured to be coupled with the second battery to detect the voltage of the second battery; the drive circuit is coupled to the voltage detection circuit to obtain the first battery The voltage of a battery and the voltage of the second battery; the first output terminal of the driving circuit is used to output a first control signal and is coupled with the control terminal of the first switching element; the second output terminal of the driving circuit The output terminal is used for outputting the second control signal, and is coupled with the control terminal of the second switching element.
The charging circuit according to claim 11, wherein the controller is further configured to connect to a communication control bus, and the communication control bus is configured to control the controller to perform voltage detection and output the first control signal and the second control signal.
A charging chip, characterized in that it is applied to an electronic device, the electronic device comprising a first battery, a second battery and a working circuit;

The charging chip includes: a first interface, a second interface, a third interface, a fourth interface, and the charging circuit according to any one of claims 1 to 12;

the first interface is used for coupling the power adapter and the second end of the voltage conversion circuit;

the second interface is used for coupling the second end of the first switching element, the second end of the second switching element, the first end of the voltage conversion circuit, and the working circuit;

The third interface is used for coupling the first battery; the fourth interface is used for coupling the second battery.
The charging chip according to claim 13, wherein the charging chip further comprises a communication control interface, and the communication control interface is used for coupling a communication control bus and the controller.
An electronic device, characterized in that it comprises a first battery, a second battery, a working circuit, and a charging chip as claimed in claim 13 or 14; the first battery is coupled with a third interface of the charging chip to supplying power to the working circuit; the second battery is coupled to the fourth interface of the charging chip to supply power to the working circuit.
An electronic device, characterized in that it comprises a power supply battery, a working circuit and a charging chip as claimed in claim 13 or 14;

the power supply battery includes a first positive electrode and a second positive electrode;

The first positive electrode is coupled to the third interface of the charging chip to supply power to the working circuit; the second positive electrode is coupled to the fourth interface of the charging chip to supply power to the working circuit.
A method for controlling a charging circuit, characterized in that it is applicable to the charging circuit according to any one of claims 1 to 12;

The method includes:

the controller detects the voltage of the first battery and the voltage of the second battery;

The controller outputs a first control signal and a second control signal according to the pressure difference between the first battery and the second battery;

The first control signal controls the first switching element to be in an on state, not fully on or off, and the second control signal controls the second switch element to be on, not fully on or off state.
The method according to claim 17, wherein the first control signal controls the first switching element to be in an on state, an incomplete turn on state or an off state, and the second control signal controls the second switch element. Switching elements are on, partially on, or off, including:

When the first battery and the second battery are in a charged state, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage of the first battery and the second battery is When the voltage difference is greater than a preset threshold, the first control signal controls the first switching element to be turned on, so as to charge the first battery; the second control signal controls the second switching element to be not completely turned on, The second battery is regulated and charged.
The method according to claim 17 or 18, characterized in that the first control signal controls the first switching element to be in an on state, not fully on or off, and the second control signal controls the The second switching element is in an on, partially on or off state, including:

When the first battery and the second battery are in a charged state, if the voltage of the second battery is higher than the voltage of the first battery, and the voltage of the first battery and the second battery is If the voltage difference is greater than a preset threshold, the first control signal controls the first switching element to not be fully turned on, so that the first battery is voltage-regulated and charged; the second control signal controls the second switching element to conduct on to charge the second battery.
The method according to any one of claims 17 to 19, wherein when the first battery and the second battery are in a charged state, if the first battery and the second battery are in a state of charge When the voltage difference is less than or equal to a preset threshold, the first control signal controls the first switch element to be turned on, so that the first battery is charged; the second control signal controls the second switch element to be turned on, The second battery is charged.
The method according to any one of claims 17 to 20, wherein the second end of the first switching element and the second end of the second switching element are both used for coupling with a working circuit, so that the The first battery and the second battery are discharged; the first control signal controls the first switching element to be in an on, incompletely on or off state, and the second control signal controls the second Switching elements are on, partially on, or off, including:

When the first battery and the second battery are in a discharged state, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage of the first battery and the second battery is If the voltage difference is greater than a preset threshold, the first control signal controls the first switching element to be turned on, so that the first battery supplies power to the working circuit; the second control signal controls the second switching element turned off, so that the second battery does not supply power to the working circuit.
The method according to any one of claims 17 to 21, wherein the second end of the first switching element and the second end of the second switching element are both used for coupling with a working circuit, so that the The first battery and the second battery are discharged; the first control signal controls the first switching element to be in an on, incompletely on or off state, and the second control signal controls the second Switching elements are on, partially on, or off, including:

When the first battery and the second battery are in a discharged state, if the voltage of the second battery is higher than the voltage of the first battery, and the voltage of the first battery and the second battery is If the voltage difference is greater than a preset threshold, the first control signal controls the first switch element to turn off, so that the first battery does not supply power to the working circuit; the second control signal controls the second switch The element is turned on, so that the second battery supplies power to the working circuit.
The method according to any one of claims 17 to 20, wherein the second end of the first switching element and the second end of the second switching element are both used for coupling with a working circuit, so that the The first battery and the second battery are discharged; the first control signal controls the first switching element to be in an on, incompletely on or off state, and the second control signal controls the second Switching elements are on, partially on, or off, including:

When the first battery and the second battery are in a discharged state, if the voltage of the first battery is higher than the voltage of the second battery, and the voltage of the first battery and the second battery is If the voltage difference is greater than a preset threshold, the first control signal controls the first switching element to not turn on completely, so that the first battery supplies power to the working circuit and regulates the voltage; the first control signal controls the The second switching element is turned on, so that the second battery supplies power to the working circuit.
The method according to any one of claims 17 to 20 and 23, wherein the second end of the first switching element and the second end of the second switching element are both used for coupling with a working circuit , so as to discharge the first battery and the second battery; the first control signal controls the first switching element to be in an on, incompletely on or off state, and the second control signal controls the The second switching element is in a conducting, incompletely conducting or off state, including:

When the first battery and the second battery are in a discharged state, if the voltage of the second battery is higher than the voltage of the first battery, and the voltage of the first battery and the second battery is If the voltage difference is greater than a preset threshold, the first control signal controls the first switching element to be turned on, so that the first battery supplies power to the working circuit; the second control signal controls the second switching element Not fully conducting, so that the second battery supplies power to the working circuit and regulates the voltage.
The method according to any one of claims 17 to 24, wherein the second end of the first switching element and the second end of the second switching element are both used for coupling with a working circuit, so that the The first battery and the second battery are discharged; the first control signal controls the first switching element to be in an on, incompletely on or off state, and the second control signal controls the second Switching elements are on, partially on, or off, including:

When the first battery and the second battery are in a discharge state, if the voltage difference between the first battery and the second battery is less than or equal to a preset threshold, the first control signal controls the The first switching element is turned on, so that the first battery supplies power to the working circuit; the second control signal controls the conduction of the second switching element, so that the second battery supplies power to the working circuit.
An electronic device, characterized in that it includes a first battery, a second battery, a charging circuit and a working circuit; the first battery and the second battery are coupled to the working circuit through the charging circuit; When the electronic device is in operation, the charging circuit is adapted to perform the method of any one of claims 17-25.