CN110336348B

CN110336348B - Terminal, switched capacitor boost circuit and power supply method

Info

Publication number: CN110336348B
Application number: CN201910579786.XA
Authority: CN
Inventors: 刘新宇; 马金博; 郑志勇; 张霞玲; 刘彦丁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-24
Filing date: 2019-06-28
Publication date: 2021-12-03
Anticipated expiration: 2039-06-28
Also published as: CN110336348A

Abstract

The embodiment of the application provides a terminal, a switched capacitor boosting circuit and a power supply method. The terminal in the embodiment of the present application may include: the charging system comprises a charging connection port, a charging and discharging management circuit, a battery, a switched capacitor boosting circuit, a load electronic circuit and a main control module, wherein the switched capacitor boosting circuit comprises N capacitors, and N is an integer greater than or equal to 1; the charging connection port is used for charging the battery through the power supply device; the charging and discharging management circuit is used for performing charging management or discharging management on the battery; the switched capacitor boosting circuit is used for performing (1+1/X) times boosting processing on the voltage of the battery and supplying power to the load electronic circuit by using the boosted voltage, wherein X is an integer greater than or equal to 1; and the main control module is used for controlling the on/off of the switched capacitor boosting circuit according to the voltage of the battery.

Description

Terminal, switched capacitor boost circuit and power supply method

The present application claims priority of chinese patent application with application number 201910334440.3, entitled "a mobile terminal device" filed by chinese patent office 24/4/2019, and the entire contents of which are incorporated herein by application.

Technical Field

The application relates to the field of terminals, in particular to a terminal, a switched capacitor boosting circuit and a power supply method.

Background

With the continuous popularization of terminals, the endurance time of the terminals has been a major concern of users. Especially when the terminal is in low temperature environment or the equivalent impedance of the battery is increased after the battery is aged, resulting in voltage drop V on the equivalent impedance of the battery when the same current flows_RThe battery can be equivalent to an ideal voltage source V_DDAnd a resistor connected in series, wherein the output voltage U of the battery_O＝V_DD-V_RWhen V is_ROutput voltage U of battery when rising_OWill be reduced, U_OWhen the minimum operating voltage of the electronic circuitry connected to the battery is reduced, the system may shut down.

In order to solve the above problems, it is attempted to reduce the equivalent impedance of the battery in order to prolong the endurance time of the terminal, but under the condition that other specifications are not changed, no effective measure is available in the industry to greatly reduce the equivalent impedance of the battery, and it is difficult to solve the problem that the endurance time of the terminal is greatly shortened under the conditions of low temperature or battery aging.

Disclosure of Invention

The embodiment of the application provides a terminal, a switched capacitor booster circuit and a power supply method, which can avoid the situation that the terminal is suddenly shut down due to the fact that the battery capacity is reduced at a low temperature or after aging.

A first aspect of the present application provides a terminal, including: the charging and discharging management circuit comprises a charging connection port, a charging and discharging management circuit, a battery, a switched capacitor boosting circuit, a load electronic circuit and a main control module; the charging connection port is used for connecting a power supply device; the charging and discharging management circuit is used for performing charging management or discharging management on the battery; the switched capacitor boosting circuit is used for boosting the voltage of the battery by (1+1/X) times and supplying power to the load electronic circuit by using the boosted voltage, wherein X is an integer greater than or equal to 1; and the main control module is used for controlling the on/off of the switched capacitor boosting circuit according to the voltage of the battery.

It can be seen from the above that, after the terminal is in a low-temperature environment or the battery is aged, the voltage of the battery is boosted by (1+1/X) times in the discharging process of the battery, and the boosted voltage is used as the power supply of the load electronic circuit, so that the situation that the battery capacity is obviously reduced and the terminal is suddenly shut down under the low-temperature or aged state can be avoided.

The switched capacitor boost circuit may include N capacitors, where N is an integer greater than or equal to 1. X may be an integer greater than or equal to 1 and less than or equal to N.

In one implementation, the main control module may determine the value of X according to the voltage of the battery.

In one implementation, as the battery discharges continuously, the voltage of the battery also decreases gradually, and as the voltage of the battery decreases, the voltage of the battery may be boosted at a higher rate in order to ensure the normal operation of the load electronic circuit. In this case, the value of X is also small, and when X takes the minimum value of 1, the switched capacitor boost circuit can realize 2 times of boost with the maximum magnification.

In one implementation, the master control module is configured to: acquiring a target parameter of a battery, acquiring the voltage of the battery if the target parameter meets a target condition, and outputting a first control signal if the voltage of the battery is in a preset voltage interval, wherein the first control signal is used for starting the switched capacitor booster circuit; the product of the maximum value of the preset voltage interval and (1+1/X) is less than or equal to the maximum working voltage of the load electronic circuit, and the product of the minimum value of the preset voltage interval and (1+1/X) is greater than or equal to the minimum working voltage of the load electronic circuit.

It will be appreciated that there may be a plurality of load electronic circuits, and that the maximum operating voltage of the load electronic circuits may be the minimum of the maximum operating voltages of all of the load electronic circuits, taking into account that the maximum operating voltages of the plurality of load electronic circuits may be different.

It will be appreciated that there may be a plurality of load electronic circuits, and that the minimum operating voltage of the load electronic circuits may be the maximum of the minimum operating voltages of all of the load electronic circuits, taking into account that the minimum operating voltages of the plurality of load electronic circuits may be different.

Therefore, the main control module can control the switch capacitor boosting circuit to be switched on and off according to the voltage of the battery, and the realizability of the scheme is improved.

In one implementation, the target parameter includes a temperature of the battery and/or a charge-discharge cycle number of the battery, and the target condition includes a preset temperature threshold and/or a preset charge-discharge cycle number threshold;

if the target parameter meets the target condition, the method comprises the following steps:

if the temperature of the battery is lower than a preset temperature threshold value and/or if the number of charge and discharge cycles of the battery is greater than a preset charge and discharge cycle number threshold value.

In this implementation, various application scenarios related to the embodiments of the present application are provided, for example, the battery temperature is lower than a preset temperature threshold (low temperature scenario) and/or the number of charge and discharge cycles of the battery is greater than a preset threshold of charge and discharge cycles (aging scenario), so that this implementation has better practicability.

In one implementation manner, the terminal further includes a first capacitor and a second capacitor, the charging connection port is connected to the input terminal of the charging and discharging management circuit, the battery connection port of the charging and discharging management circuit is electrically connected to the positive electrode of the battery, the output port of the charging and discharging management circuit is connected to the load electronic circuit, the positive electrode of the battery is connected to the battery connection port of the switch capacitor voltage-boosting circuit, the negative electrode of the battery is grounded, the output port of the switch capacitor voltage-boosting circuit is electrically connected to the load electronic circuit, the output terminal of the main control module is respectively connected to the charging and discharging management circuit and the switch capacitor voltage-boosting circuit, one end of the first capacitor is connected to the positive electrode of the battery, the other end of the first capacitor is grounded, one end of the second capacitor is connected to the output port of the switch capacitor voltage-boosting circuit, the other end of the second capacitor is grounded.

In the normal discharging state of the battery, the internal switch between the battery connection port and the output port in the charging and discharging management circuit can be in a closed state. In a discharging state that the battery is subjected to the boosting treatment of the switched capacitor boosting circuit, an internal switch between the battery connection port and the output port in the charge and discharge management circuit may be in an off state.

In one implementation mode, the terminal further comprises a first capacitor and a second capacitor, the charging connection port is connected with the input end of the charging and discharging management circuit, the battery connection port of the charging and discharging management circuit is connected with the output port of the switch capacitor boosting circuit, the positive pole of the battery is connected with the battery connection port of the switch capacitor boosting circuit, the negative pole of the battery is grounded, the output end of the main control module is respectively connected with the charging and discharging management circuit and the switch capacitor boosting circuit, one end of the first capacitor is connected with the positive pole of the battery, the other end of the first capacitor is grounded, one end of the second capacitor is connected with the output port of the switch capacitor boosting circuit, and the other end of the second capacitor is grounded.

It should be noted that the battery connection port of the charge and discharge management circuit may be connected to the output port of the charge and discharge management circuit through its internal switch, and the output port of the charge and discharge management circuit is connected to the load electronic circuit.

In one implementation, the switched capacitor boost circuit includes a two-phase boost circuit group, the two-phase boost circuit group includes two boost sub-circuits, the two boost sub-circuits perform (1+1/X) -fold boost processing on the voltage of the battery, and supply power to the load electronic circuit by using the boosted voltage.

Wherein, the two boosting sub-circuits can be symmetrically arranged.

In this implementation, switched capacitor boost circuit can also be the form of biphase boost circuit group, and this kind of design makes switched capacitor boost circuit efficiency higher, and its ripple current of input is littleer, and the ripple voltage of output is littleer.

In one implementation, the terminal further comprises a switched capacitor voltage-reducing circuit, the switched capacitor voltage-reducing circuit comprises M capacitors, M is an integer greater than or equal to 1, the switched capacitor voltage-reducing circuit is used for performing 1/M +1 times voltage-reducing processing on the voltage from the charging connection port, and the voltage after voltage reduction is used for charging the battery, wherein the input end of the switched capacitor voltage-reducing circuit is connected with the charging connection port, and the battery connection port of the switched capacitor voltage-reducing circuit is connected with the anode of the battery.

In one implementation, M is an integer greater than or equal to 1 and less than or equal to N.

In this implementation, the terminal can also include switched capacitor voltage reduction circuit, and the efficiency of charging for the battery through switched capacitor voltage reduction circuit is higher, and it is littleer to generate heat, consequently more is fit for the scene of filling soon that the heavy current charges. Meanwhile, the switched capacitor voltage reducing circuit and the switched capacitor voltage increasing circuit share a part of capacitors and switching devices, namely the switched capacitor voltage increasing circuit and the switched capacitor voltage reducing circuit are not required to be completely and independently opened, and the area and the cost of the whole system are saved.

In one implementation, the switched capacitor voltage reduction circuit includes a dual-phase voltage reduction circuit group, the dual-phase voltage reduction circuit group includes two voltage reduction sub-circuits, the two voltage reduction sub-circuits perform 1/M +1 times voltage reduction processing on the voltage from the charging connection port, and the voltage after voltage reduction is used for charging the battery.

Wherein, the two voltage reduction sub-circuits are suggested to be symmetrically arranged.

In this implementation, switched capacitor voltage reduction circuit realizes with the form of diphase voltage reduction circuit group, and diphase switched capacitor voltage reduction circuit efficiency is higher, and its ripple current of input is littleer, and the ripple voltage of output is littleer.

In one implementation, the main control module is configured to turn off the switched capacitor boost circuit when a voltage of the battery reaches a discharge cut-off voltage.

In one implementation manner, during the discharging process of the voltage of the battery, the value of X is reduced along with the reduction of the voltage of the battery, the value of X is minimum equal to 1, and the discharged voltage of the battery is greater than or equal to the discharge cut-off voltage.

For example, if the number of capacitors connected in series in the network from the positive electrode of the battery to the negative electrode of the battery is 5, that is, N is 5, the switched capacitor boost circuit can realize (1+1/5) -fold boost, and can realize (1+1/4) -fold, (1+1/3) -fold, (1+1/2) -fold and (1+1/1) -fold boost through internal switching without changing the circuit, and the boost rate is gradually increased as the battery voltage decreases, that is, the value of X decreases as the battery voltage decreases.

A second aspect of the present application provides a switched capacitor voltage boost circuit, including N capacitors, where N is an integer greater than or equal to 1, a battery connection port of the switched capacitor voltage boost circuit is used to connect an anode of a battery, and an output port of the switched capacitor voltage boost circuit is used to couple a load electronic circuit;

the switched capacitor boosting circuit is used for boosting the voltage of the battery by (1+1/X) times and supplying power to the load electronic circuit by using the boosted voltage, wherein X is an integer which is greater than or equal to 1 and less than or equal to N.

In one implementation, the output port of the switched capacitor boost circuit is used for coupling with a load electronic circuit, and may be: the output port of the switched capacitor booster circuit can be directly connected with the load electronic circuit.

In one implementation, the output port of the switched capacitor boost circuit is used for coupling with a load electronic circuit, and may be: the output port of the switched capacitor booster circuit can be connected with the load electronic circuit through the battery connecting port of the charge and discharge management circuit.

In one implementation, the switched capacitor boost circuit is configured to perform (1+1/X) -fold boost processing on the voltage of the battery when the voltage of the battery is greater than a discharge cut-off voltage and less than a preset voltage, and supply power to the load electronic circuit with the boosted voltage.

The preset voltage may be 3.7V or 3.5V. Different terminals may have different discharge cutoff voltages and preset voltages.

In one implementation, the switched capacitor boost circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, and a thirteenth switch;

one end of the third capacitor is connected with one end of the first switch, a connecting point is connected with one end of the second switch, the other end of the first switch is connected with one end of the third switch, the connecting point is connected with one end of the fourth switch, one end of the fifth switch and the anode of the battery, the other end of the second switch is connected with the other end of the third switch, and the connecting point is connected with the load electronic circuit;

the other end of the third capacitor is connected with one end of the sixth switch, a connecting point is connected with one end of the seventh switch, the other end of the seventh switch is connected with the anode of the battery, the other end of the sixth switch is connected with one end of the fourth capacitor, a connecting point is connected with one end of the eighth switch and the other end of the fourth switch, and the other end of the eighth switch is connected with the load electronic circuit;

the other end of the fourth capacitor is connected with one end of the ninth switch, a connecting point is connected with one end of the tenth switch, the other end of the tenth switch is connected with the anode of the battery, the other end of the ninth switch is connected with one end of the fifth capacitor, a connecting point is connected with one end of the eleventh switch and the other end of the fifth switch, and the other end of the eleventh switch is connected with the load electronic circuit;

the other end of the fifth capacitor is connected with one end of the twelfth switch, a connecting point is connected with one end of the thirteenth switch, the other end of the twelfth switch is grounded, and the other end of the thirteenth switch is connected with the anode of the battery.

In this implementation, the connection relationship between the elements inside the switched capacitor voltage boosting circuit is described by taking the example that the switched capacitor voltage boosting circuit includes three capacitors. It can be understood that the switched capacitor boost circuit may also include two capacitors, four capacitors, and the like, and the number of the capacitors included in the switched capacitor boost circuit may be determined according to a specific application.

Wherein, the two boosting sub-circuits can be symmetrically arranged.

In one implementation manner, the two-phase boost circuit group includes a first boost sub-circuit and a second boost sub-circuit, the first boost sub-circuit includes a third capacitor, a fourth capacitor, a fifth capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch and a thirteenth switch, the second boost sub-circuit includes a sixth capacitor, a seventh capacitor, an eighth capacitor, a fourteenth switch, a fifteenth switch, a sixteenth switch, a seventeenth switch, an eighteenth switch, a nineteenth switch, a twentieth switch, a twenty-first switch, a twenty-second switch, a twenty-third switch, a twenty-fourth switch and a twenty-fifth switch;

one end of the third capacitor is connected with one end of the first switch, and the connecting point is connected with one end of the second switch;

the other end of the third capacitor is connected with one end of a sixth switch, a connecting point is connected with one end of a seventh switch, the other end of the seventh switch is connected with the anode of the battery, the other end of the sixth switch is connected with one end of a fourth capacitor, the connecting point is connected with one end of an eighth switch and the other end of the fourth switch, and the other end of the eighth switch is connected with a load electronic circuit;

the other end of the fourth capacitor is connected with one end of a ninth switch, a connecting point is connected with one end of a tenth switch, the other end of the tenth switch is connected with the anode of the battery, the other end of the ninth switch is connected with one end of a fifth capacitor, the connecting point is connected with one end of an eleventh switch and the other end of the fifth switch, and the other end of the eleventh switch is connected with the load electronic circuit;

the other end of the fifth capacitor is connected with one end of a twelfth switch, a connecting point is connected with one end of a thirteenth switch, the other end of the twelfth switch is grounded, and the other end of the thirteenth switch is connected with the anode of the battery;

one end of the sixth capacitor is connected with one end of the fourteenth switch, and the connecting point is connected with one end of the fifteenth switch, the other end of the fourteenth switch is connected with one end of the third switch, and the connecting point is connected with one end of the sixteenth switch, one end of the seventeenth switch and the anode of the battery, the other end of the fifteenth switch is connected with the other end of the third switch, and the connecting point is connected with the load electronic circuit;

the other end of the sixth capacitor is connected with one end of an eighteenth switch, a connecting point is connected with one end of a nineteenth switch, the other end of the nineteenth switch is connected with the anode of the battery, the other end of the eighteenth switch is connected with one end of the seventh capacitor, the connecting point is connected with one end of a twentieth switch and the other end of a sixteenth switch, and the other end of the twentieth switch is connected with a load electronic circuit;

the other end of the seventh capacitor is connected with one end of the twenty-first switch, a connecting point is connected with one end of the twenty-second switch, the other end of the twenty-second switch is connected with the anode of the battery, the other end of the twenty-first switch is connected with one end of the eighth capacitor, the connecting point is connected with one end of the twenty-third switch and the other end of the seventeenth switch, and the other end of the twenty-third switch is connected with the load electronic circuit;

the other end of the eighth capacitor is connected with one end of the twenty-fourth switch, the connecting point is connected with one end of the twenty-fifth switch, the other end of the twenty-fourth switch is grounded, and the other end of the twenty-fifth switch is connected with the anode of the battery.

In this implementation manner, a connection relationship between each internal element of the switched capacitor boost circuit in the form of a two-phase boost circuit group is provided, and the expansibility of this scheme is improved.

In one implementation, the switched capacitor voltage boosting circuit comprises a switched capacitor voltage reducing circuit, the switched capacitor voltage reducing circuit comprises M capacitors, M is an integer greater than or equal to 1, an input end of the switched capacitor voltage reducing circuit is connected with the charging connection port, and a battery connection port of the switched capacitor voltage reducing circuit is connected with an anode of a battery;

the switch capacitor voltage reduction circuit is used for carrying out 1/M +1 time voltage reduction processing on the voltage from the charging connection port, and charging the battery by the voltage after voltage reduction.

In one implementation, M may be an integer greater than or equal to 1 and less than or equal to N.

In one implementation, the switched-capacitor voltage-dropping circuit includes the fifth capacitor, the twelfth switch, the thirteenth switch, a twenty-sixth switch, and a twenty-seventh switch;

one end of the fifth capacitor is connected with one end of the twenty-sixth switch, a connecting point is connected with the other end of the ninth switch, one end of the eleventh switch, the other end of the fifth switch and one end of the twenty-seventh switch, the other end of the twenty-sixth switch is connected with the charging connecting port, and the other end of the twenty-seventh switch is connected with the anode of the battery.

In this implementation manner, the switched capacitor voltage-reducing circuit is taken as an example, and the connection relationship between the elements in the switched capacitor voltage-reducing circuit is introduced, so that the realizability of the scheme is further improved.

It can be understood that the switched capacitor voltage-reducing circuit may also include two capacitors, four capacitors, and the like, and the number of the capacitors included in the switched capacitor voltage-reducing circuit may be determined according to a specific application.

In one implementation, the switched capacitor boost circuit includes a switched capacitor buck circuit, the switched buck circuit includes a dual-phase buck circuit group, the dual-phase buck circuit group includes two buck sub-circuits, the two buck sub-circuits perform 1/M +1 times buck processing on the voltage from the charging connection port, and the voltage after buck is used as the battery charging.

Wherein, the two voltage-reducing sub-circuits can be symmetrically arranged.

In one implementation, the two-phase voltage-reducing circuit group includes a first voltage-reducing sub-circuit and a second voltage-reducing sub-circuit, the first voltage-reducing sub-circuit includes a fifth capacitor, a twelfth switch, a thirteenth switch, a twenty-sixth switch and a twenty-seventh switch, and the second voltage-reducing sub-circuit includes an eighth capacitor, a twenty-fourth switch, a twenty-fifth switch, a twenty-eighth switch and a twenty-ninth switch;

one end of a fifth capacitor is connected with one end of a twenty-sixth switch, and the connecting point is connected with the other end of the ninth switch, one end of the eleventh switch, the other end of the fifth switch and one end of a twenty-seventh switch, the other end of the twenty-sixth switch is connected with a charging connecting port, and the other end of the twenty-seventh switch is connected with the anode of the battery;

one end of the eighth capacitor is connected with one end of the twenty-eighth switch, the connecting point is connected with the other end of the twenty-first switch, one end of the twenty-third switch, the other end of the seventeenth switch and one end of the twenty-ninth switch, the other end of the twenty-eighteenth switch is connected with the charging connecting port, and the other end of the twenty-ninth switch is connected with the anode of the battery.

In this embodiment, a connection relationship between the internal elements of the switched capacitor voltage-reducing circuit in the form of a two-phase voltage-reducing circuit group is provided, so that the expansibility of the scheme is improved.

In one implementation manner, during the discharging process of the voltage of the battery, the value of X decreases with the decrease of the voltage of the battery, the value of X is minimum equal to 1, and the discharged voltage of the battery is greater than or equal to the discharge cut-off voltage.

A third aspect of the present application provides a power supply method, where the power supply method may be applied to a terminal in any implementation manner of the first aspect of the present application, and the power supply method includes:

acquiring target parameters of the battery;

if the target parameter meets the target condition, acquiring a first variable voltage of the battery;

if the first variable voltage is in a first voltage interval, performing (1+1/X) times of boosting processing on the first variable voltage to obtain a second variable voltage, wherein X is an integer greater than or equal to 1, the product of the maximum value of the first voltage interval and (1+1/X) is less than or equal to the maximum working voltage of the load electronic circuit, and the product of the minimum value of the first voltage interval and (1+1/X) is greater than or equal to the minimum working voltage of the load electronic circuit;

and supplying power to the load electronic circuit with the second variable voltage.

In one implementation, the target parameter is the temperature of the battery and/or the charge-discharge cycle number of the battery, and the target condition is a preset temperature threshold and/or a preset charge-discharge cycle number threshold;

if the target parameter meets the target condition, acquiring a first variable voltage of the battery comprises:

and if the temperature of the battery is lower than a preset temperature threshold value and/or the charge-discharge cycle number of the battery is greater than a preset charge-discharge cycle number threshold value, acquiring a first variable voltage of the battery.

In the embodiment, the scheme can be particularly suitable for low-temperature environments, and the practicability of the scheme is improved.

In one implementation, the method further comprises: if the first variable voltage is in a second voltage interval, performing (1+1/K) times of boosting processing on the first variable voltage to obtain a third variable voltage, wherein K is an integer which is greater than or equal to 1 and less than X, the product of the maximum value of the second voltage interval and (1+1/K) is less than or equal to the maximum working voltage of the load electronic circuit, the minimum value of the second voltage interval is greater than or equal to the discharge cut-off voltage of the battery, and the third variable voltage is greater than or equal to the minimum working voltage of the load electronic circuit and less than or equal to the maximum working voltage of the load electronic circuit;

and supplying power to the load electronic circuit with the third variable voltage.

In the embodiment, as the voltage of the battery is continuously reduced in the discharging process of the battery, the boosting multiplying power of the switched capacitor boosting circuit can be dynamically adjusted, so that the stability of the battery for supplying power to the load electronic circuit is ensured to the greatest extent.

In one implementation, the minimum value of K is the minimum integer satisfying a preset condition in the value of K, where the preset condition is 1+1/K < U1/U2, where U1 is the maximum operating voltage of the load electronic circuit, and U2 is the discharge cutoff voltage of the battery.

In this embodiment, a specific implementation manner for determining the maximum boosting rate of the switched capacitor boost circuit is provided, so that the realizability of the scheme is improved.

A fourth aspect of the present application provides a power supply method, including:

acquiring target parameters of the battery;

if the target parameter meets a target condition, acquiring the voltage of the battery;

and when the voltage of the battery is greater than the discharge cut-off voltage and less than a preset voltage, performing (1+1/X) times of boosting treatment on the voltage of the battery, and supplying power to the load electronic circuit by using the boosted voltage, wherein X is an integer greater than or equal to 1.

In one implementation, the target parameter includes a temperature of the battery and/or a number of charge and discharge cycles of the battery, and the target condition includes a preset temperature threshold and/or a preset number of charge and discharge cycles threshold;

if the target parameter meets a target condition, acquiring the voltage of the battery comprises:

and if the temperature of the battery is lower than the preset temperature threshold value and/or the charge-discharge cycle number of the battery is greater than the preset charge-discharge cycle number threshold value, acquiring the voltage of the battery.

In the foregoing implementation manner, the main control module may determine whether the temperature of the battery is at a low temperature. The master control module can determine the cycle number of charging and discharging.

In the foregoing implementation manner, the main control module may determine that the temperature of the battery is lower than a preset temperature threshold. The main control module can determine that the number of charge and discharge cycles of the battery is greater than a preset threshold value of the number of charge and discharge cycles.

The preset temperature threshold may be 0 degree, or may also be 1 degree. The threshold value of the number of charge and discharge cycles may be 500 times or 400 times. The preset temperature threshold and the charge-discharge cycle number threshold can be set to different thresholds according to the actual condition of the terminal.

In the process of discharging the voltage of the battery, the value of X is reduced along with the reduction of the voltage of the battery, the minimum value of X is equal to 1, and the discharged voltage of the battery is greater than or equal to the discharge cut-off voltage.

A fifth aspect of the present application provides a power supply method, including:

acquiring the voltage of a battery;

In the foregoing implementation, the main control module may be a processor, for example, the processor may be an application processor.

In the above implementation manner, the main control module may determine the value of X according to the voltage of the battery.

It can be seen from the above that, in the discharging process of the battery, the voltage of the battery can be boosted by (1+1/X) times of the battery voltage, and the boosted voltage is used as the power supply of the load electronic circuit.

Drawings

Fig. 1 is a schematic structural diagram of a terminal applied to a charging and discharging scene;

fig. 2 is a schematic diagram of a circuit structure of the terminal provided in the present application;

fig. 3 is a schematic diagram of another circuit configuration of a terminal provided in the present application;

FIG. 4 is a schematic diagram of an operating state of the single-phase switched capacitor boost circuit of the present application;

FIG. 5 is a schematic diagram of another operating state of the single-phase switched capacitor boost circuit of the present application;

FIG. 6 is a schematic diagram of another operating state of the single-phase switched capacitor boost circuit of the present application;

FIG. 7 is a schematic diagram of another operating state of the single-phase switched capacitor boost circuit of the present application;

FIG. 8 is a schematic diagram of another operating state of the single-phase switched capacitor boost circuit of the present application;

FIG. 9 is a schematic diagram of another operating state of the single-phase switched capacitor boost circuit of the present application;

FIG. 10 is a schematic diagram of an operating state of a two-phase switched capacitor boost circuit of the present application;

FIG. 11 is a schematic diagram of another operating state of a two-phase switched capacitor boost circuit of the present application;

FIG. 12 is a schematic diagram of another operating state of the two-phase switched capacitor boost circuit of the present application;

FIG. 13 is a schematic diagram of another operating state of a two-phase switched capacitor boost circuit of the present application;

FIG. 14 is a schematic diagram of another operating state of a two-phase switched capacitor boost circuit of the present application;

FIG. 15 is a schematic diagram of another operating state of the dual-phase switched capacitor boost circuit of the present application;

FIG. 16 is a schematic diagram of an operating state of the single-phase switched capacitor voltage step-down circuit of the present application;

FIG. 17 is a schematic diagram of another operating state of the single-phase switched capacitor voltage step-down circuit of the present application;

FIG. 18 is a schematic diagram of an operating state of a two-phase switched capacitor voltage step-down circuit of the present application;

FIG. 19 is a schematic diagram of another operating state of the dual-phase switched capacitor voltage step-down circuit of the present application;

FIG. 20 is a schematic structural diagram of a terminal of the present application being a mobile phone;

fig. 21 is a schematic diagram of an embodiment of a power supply method in the present application.

Detailed Description

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein.

The embodiment of the application can be applied to terminal equipment. Specifically, the terminal device may be referred to as a User Equipment (UE), a Mobile Station (MS), a mobile terminal (mobile terminal), an intelligent terminal, and the like. The terminal device may communicate with one or more core networks via a Radio Access Network (RAN). For example, the terminal equipment may be a mobile phone (or so-called "cellular" phone), a computer with a mobile terminal, etc., and the terminal equipment may also be a portable, pocket, hand-held, computer-included or vehicle-mounted mobile device and terminal equipment in future NR networks, which exchange voice or data with a radio access network. Of course, the terminal in the present application may also be a stand-alone device that does not access the network, such as an MP3 player.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 is an application scenario applicable to the embodiments of the present application. In the scenario shown in fig. 1, terminal device 110, cable 120, and charger 130 are included, charger 130 is connected to terminal device 110 through cable 120, and terminal device 110 includes: a connector 111, a charge management chip 112, a battery 113, and a load 114. The battery 113 may include a battery protection plate 113-1 and a battery cell 113-2. During charging, the current flow direction is as follows: charger 130 → cable 120 → connector 111 → charge management chip 112 → battery 113. During discharge, the current flow direction is as follows: battery 113 → load 114.

With the increasing popularity of the terminal, the endurance time of the terminal has always been a major concern for users, especially when the equivalent resistance of the battery increases in a low-temperature environment or after aging, resulting in a voltage drop V across the equivalent impedance of the battery when the same current flows_RThe battery can be equivalent to an ideal voltage source V_DDAnd V_RIn series, wherein the output voltage U of the battery_O＝V_DD-V_RWhen V is_ROutput voltage U of battery when rising_OWill be reduced, U_OIs reduced to be connected to a batteryAt the lowest operating voltage of the electronic circuit above, the terminal will shut down. For example, in winter, a mobile phone may be turned off suddenly when taking a picture outdoors at a low temperature, and even if the mobile phone still has a lot of power indoors in winter, the mobile phone may be brought outdoors to be in a static state when not used, and the power may be significantly reduced. In addition, the current terminal equipment powered by lithium batteries such as mobile phones and the like can have the condition that the available discharge capacity of the batteries is obviously reduced after the terminal equipment is used for one or two years, mainly because the batteries are aged after certain charge-discharge cycles, and the equivalent impedance R of the batteries is increased after the batteries are aged.

Aiming at the problems of the application scenes, the problems can be solved by three ideas of reducing the equivalent impedance of the battery, reducing the working voltage of an electronic circuit connected to the battery, increasing a booster circuit to raise the voltage of the battery to a certain range and then supplying power to a rear-stage load electronic circuit. Under the condition that other specifications are not changed, no effective measure for greatly reducing the equivalent impedance of the battery exists in the industry at present, and the method is difficult to realize. The chip industry has gone through such years of development and it is not possible to continue to reduce the minimum input voltage specification of the electronic circuit connected to the battery on an existing basis in a short period of time; because the voltage of a plurality of battery cells connected in series is high, the discharge capacity can be increased by adjusting the discharge cut-off voltage of the battery when the equivalent impedance is increased at low temperature or after the battery is aged for the application of the battery pack. However, for a terminal device such as a mobile phone powered by a single battery, it is impossible to increase the discharge capacity by adjusting the discharge cutoff voltage of the battery in this case, because the discharge cutoff voltage of the battery is continuously adjusted downward beyond the minimum input voltage range of the electronic circuit connected to the battery, and the electronic circuit connected to the battery cannot operate.

In order to solve the above problem, an embodiment of the present application provides a terminal, where after the terminal is in a low-temperature environment or the battery ages, the voltage of the battery is boosted by a factor of (1+1/X) during the discharging process of the battery, and when the voltage of the battery is continuously reduced during the discharging process, the output of the boost circuit is also continuously reduced. If the value of X is fixed, the multiplying power of (1+1/X) times between the output and the input of the booster circuit is kept unchanged. When the battery voltage further decreases, the output of the booster circuit also further decreases, and in this case, a larger multiple of boosting can be achieved by taking X to a smaller value. For example, when X is 3 at the initial start, a voltage increase of 1+1/3 times can be achieved, and when the battery voltage drops to a certain extent, X can be set to 2 to achieve a voltage increase of 1+1/2 times.

The embodiments of the present application provide various different circuit structures applied to a terminal, which are described below.

First, please refer to fig. 2, wherein fig. 2 is a schematic circuit structure diagram of a terminal according to an embodiment of the present disclosure. The terminal includes a charging connection port 101 (for example, the charging connection port may be a USB connector), a charging and discharging management circuit 102, a battery 103, a switched capacitor boosting circuit 104, a load electronic circuit 105, and a main control module 106. Wherein the charging connection port 101 passes through V_BUSThe line is connected to the input terminal of the charge and discharge management circuit 102, and the output terminal SYS of the charge and discharge management circuit 102 passes through V_SYSThe line is connected to the load electronic circuit 105, the SYS port of the charge and discharge management circuit 102 is connected to the positive electrode of the battery 103 through an internal switch Q4, the positive electrode of the battery 103 is also connected with a battery connection port BAT of the switched capacitor voltage boosting circuit 104, the negative electrode of the battery 103 is grounded, and the SYS port of the switched capacitor voltage boosting circuit 104 is also connected with the positive electrode of the battery 103 through a V_SYSThe line is connected to the load electronic circuit 105, and the output end of the main control module 106 is connected to the charge and discharge management circuit 102 and the switched capacitor boost circuit 104, respectively. In addition, the terminal also comprises a first capacitor C₀And a second capacitor C_SYS，C₀In parallel with battery 103, i.e. C₀Is connected to the positive electrode of the battery 103, C₀The other end of which is grounded, a capacitor C_SYSIs connected to the output terminal SYS of the switched capacitor boost circuit 104, and a capacitor C_SYSIs grounded at the other end, wherein, C₀And C_SYSFor storing electrical energy.

The output port of the switched capacitor voltage boost circuit 104 is used for coupling the load electronic circuit 105, as shown in fig. 2, the output port of the switched capacitor voltage boost circuit 104 may be directly connected to the load electronic circuit 105.

It can be understood that the main control module 106 in the embodiment of the present application may specifically be a processor of a terminal. For example, the processor may be an application processor.

During the discharge process in the normal state of the battery, the battery is discharged in the first current direction in fig. 2 (Q4 closed). During the discharge process at low temperatures or in the state of aging of the battery, the discharge proceeds according to the second current profile in fig. 2 (Q4 off).

Second, referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a terminal according to an embodiment of the present disclosure, in which the terminal includes a charging connection port 101 (for example, the charging connection port is a USB connector), a charging and discharging management circuit 102, a battery 103, a switched capacitor voltage boosting circuit 104, a load electronic circuit 105, and a main control module 106. Fig. 3 differs from fig. 2 in that the SYS port of the charge and discharge management circuit 102 is connected to the SYS port of the switched capacitor boost circuit 104 through an internal switch Q4. The positive electrode of the battery 103 is connected to the battery port BAT of the switched capacitor boost circuit 104 and is no longer connected to the BAT port of the charge and discharge management circuit 102. In addition, the load electronic circuit 105 may be connected to V in fig. 3_SYS1Above, also can be connected to V_SYS2Or a part thereof is connected to V_SYS1Another part is connected to V_SYS2The above details are not limited herein.

It should be noted that the battery is discharged according to the current trend in fig. 3 during the discharging process (Q4 is always closed), and it can be seen that the scheme shown in fig. 3 does not switch Q4 due to the introduction of the switched capacitor voltage boost circuit 104, and Q4 is always kept closed, compared with the scheme shown in fig. 2. The output port of the switched capacitor voltage boost circuit 104 is configured to couple to the load electronic circuit 105, as shown in fig. 3, the output port of the switched capacitor voltage boost circuit 104 may be connected to the load electronic circuit 105 through the battery connection port of the charge/discharge management circuit 102.

The function of the components is described below in connection with the embodiments shown in fig. 2 and 3:

the charging connection port 101 is used for connecting an external power supply device, for example, the charging connection port 101 is connected with a charger. The charging connection port 101 thus charges the battery 103 or supplies power to the terminal device by an external power supply device. The charging and discharging management circuit 102 is configured to perform charging or discharging management on the battery 103, the main control module 106 is configured to control the switching capacitor boosting circuit 104 to be turned on or turned off, the switching capacitor boosting circuit 104 is configured to perform (1+1/X) times of boosting processing on the voltage of the battery 103, and the boosted voltage is used as power for the load electronic circuit 105, where X is an integer greater than or equal to 1. As the voltage of the battery 103 gradually decreases during the discharging process, the value of X may also gradually decrease.

It should be noted that, when the system (for example, the system may be a processor) determines that the voltage at the output end of the battery is not enough to maintain the normal operation of the load electronic circuit due to low temperature or aging, the main control module 106 starts the switched capacitor voltage boost circuit 104 to boost the voltage of the battery 103 by (1+1/X) times, where the switched capacitor voltage boost circuit 104 may include N capacitors, and the maximum value of X is determined by the number of N capacitors connected in series in a network from the positive electrode of the battery to the negative electrode of the battery. Wherein, the capacitance parameters of the N capacitors connected in series in the network from the positive electrode of the battery to the negative electrode of the battery can be consistent.

The larger the value of X is, the smaller the boosting proportion is, the more components are needed, the smaller the value of X is, the larger the boosting proportion is, and the fewer components are needed. When X takes the minimum value of 1, the switched capacitor boost circuit 104 achieves the maximum boost ratio, i.e., 2 times boost. For example, if the number of capacitors connected in series in the network from the battery positive electrode to the battery negative electrode is 5, that is, N is 5, the switched capacitor boost circuit 104 can realize (1+1/5) -fold boost, and can realize (1+1/4) -fold, (1+1/3) -fold, (1+1/2) -fold, and (1+1/1) -fold boost by internal switching without changing the circuit, and the boost rate is gradually increased as the battery voltage decreases.

The following describes in detail the process from the on to the off of the switch capacitance boosting circuit with reference to the low-temperature environment and the two scenes after the battery aging respectively:

firstly, in a low-temperature environment, a terminal collects the current of a battery, and if the discharge current of the battery is greater than a preset discharge current threshold (for example, the discharge current threshold may be 0.5A, the discharge current threshold may also be 1A, also may be 0.2A or other values, and the discharge current threshold may be determined according to an actual application situation), it is determined that the battery is in a discharge state. The terminal detects the temperature of the battery, and if the detected temperature is lower than a preset temperature threshold (for example, the preset temperature threshold may be 0 degrees, the preset temperature threshold may also be 10 degrees, and the preset temperature threshold may be determined according to an actual application situation), it is determined that the battery is in a low-temperature environment, and then the terminal detects the voltage of the battery. If the voltage of the battery is in a preset voltage interval (for example, 2.55V-3.525V), the switched capacitor boosting circuit is turned on, and when the terminal detects that the voltage of the battery reaches the discharge cutoff voltage, the switched capacitor boosting circuit is turned off, and the battery discharge is stopped. It will be appreciated that the system (which may be, for example, a processor) may determine the initial boost rate and the preset voltage interval based on the maximum and minimum operating voltages of the load electronic circuit. The system (for example, a processor) may monitor the voltage of the battery in real time, and as the voltage of the battery decreases, when the voltage of the battery decreases to a preset voltage interval, the main control module 106 controls to turn on the switched capacitor voltage boost circuit 104. When the battery voltage drops to the discharge cutoff voltage of the battery, the battery is no longer discharged, and the main control module 106 controls to turn off the switched capacitor voltage boost circuit 104. The manner of determining the boosting rate and the preset voltage interval will be described in detail in the following embodiments.

It should be noted that the discharge cutoff voltage of the battery can be calculated according to the following manner: the battery discharge cut-off voltage EDVTI is EDVI-I (RTI-RI), wherein EDVTI is a discharge cut-off voltage point of the battery under the condition that the discharge current is I when the temperature is T, and the temperature is the temperature of the battery lower than a preset temperature threshold; EDVI is a discharge cut-off voltage point of the battery at normal temperature (wherein normal temperature is understood as a temperature of 22 to 28 degrees, for example, normal temperature may be 25 degrees, or 22 degrees or 28 degrees, etc.) under a condition that a discharge current is I; i is the measured battery discharge current; RTI is the equivalent direct current impedance of the battery under the condition that the discharge current is I when the temperature is T; RI is the equivalent dc impedance of the battery at room temperature under the condition that the discharge current is I. The EDVI, the RTI and the RI can be measured by an experimental method and stored in a memory of the terminal, and the terminal can be obtained by looking up a table in the operation process. In addition, the discharge cut-off voltage EDVTI of the battery can also be obtained by testing according to an experimental method and stored in a memory of the terminal, and the terminal can be obtained by looking up a table through the battery temperature T and the discharge current I in the operation process. It is understood that the discharge current I does not change with the temperature, for example, the collected battery current is 2A, and the battery is determined to be in a discharge state, and the EDVI, the RTI, and the RI are all measured based on the discharge current of 2A. In addition, due to the fact that the equivalent impedance of the battery at low temperature is increased, RTI is larger than RI, the voltage drop of the equivalent resistance of the battery after the battery is changed from normal temperature to low temperature (temperature is T) can be calculated through I (RTI-RI), and the EDVTI can be obtained by subtracting the calculated voltage drop from EDVI.

Secondly, in a scene after the battery is aged, the terminal collects the current of the battery, and if the discharge current of the battery is larger than a preset discharge current threshold (for example, the discharge current threshold is 0.5A), it is determined that the battery is in a discharge state. The terminal reads the charge-discharge cycle number of the battery, if the charge-discharge cycle number of the battery is larger than a preset charge-discharge cycle number threshold (for example, the charge-discharge cycle number threshold is 500), the battery is judged to be in an aging state, the terminal detects the voltage of the battery, if the voltage of the battery is in a preset voltage interval, the switched capacitor boosting circuit is started, and when the terminal detects that the voltage of the battery reaches the discharge cutoff voltage, the switched capacitor boosting circuit is closed and the battery is stopped to discharge.

It should be noted that the discharge cutoff voltage of the battery can be calculated according to the following manner: the discharge cut-off voltage EDVAI ═ EDVI-I (RAI-RI) of the battery, where EDVAI is a discharge cut-off voltage point of the battery under a condition that a discharge current after aging is I; EDVI is the discharge cutoff voltage point for an unaged cell at discharge current I; i is the measured battery discharge current; RAI is the equivalent direct current impedance of the battery under the condition that the discharge current is I after aging; RI is the equivalent dc impedance of the new battery under the condition of discharge current I. The EDVI, RAI, and RI may be experimentally measured and stored in a memory of the terminal, and the terminal may be obtained by looking up a table during operation. In addition, the discharge cut-off voltage EDVAI of the battery can also be obtained through testing according to an experimental method and stored in a memory of the terminal, and the terminal can be obtained through table lookup of the charge-discharge cycle times and the discharge current I of the battery in the operation process. It is understood that the discharge current I does not change with the temperature, for example, the collected battery current is 2A, and the battery is determined to be in a discharge state, and the EDVI, the RAI, and the RI are all measured based on the discharge current of 2A. In addition, as the equivalent resistance of the aged battery is increased, so that RAI is larger than RI, the voltage drop of the equivalent resistance of the battery after the battery is changed from the unaged state to the aged state can be calculated through I (RAI-RI), and the EDVAI can be obtained by subtracting the calculated voltage drop from the EDVI.

It can be seen from the above description that, after the terminal is in a low-temperature environment or the battery is aged, the voltage of the battery is boosted by a multiplying factor of (1+1/X) in the discharging process of the battery, and the boosted voltage is used as the power supply for the load electronic circuit.

The operation principle of the switching boost circuit in the terminal of the present application is described below with reference to the accompanying drawings:

referring to fig. 4, fig. 4 is a schematic circuit structure diagram of a switching capacitor boost circuit in a terminal according to an embodiment of the present disclosure, where fig. 4 is taken as an example that the number of capacitors connected in series in a network from a battery anode to a battery cathode is 3, it can be understood that in practical application, the number of capacitors connected in series in the network from the battery anode to the battery cathode may be other numbers, and is not limited herein.

As can be seen from fig. 4, the switched capacitor boost circuit is composed of a capacitor and a switch, and the battery is connected to the power supply bus V through the switch Q4 inside the charge and discharge management circuit 102 under the normal discharge state of the terminal corresponding to the embodiment shown in fig. 2_SYSAnd supplying power to the system. Corresponding to the embodiment shown in fig. 3, the battery can be opened by closing the terminal under the normal discharge stateA third switch Q44, a fourth switch S91, and an eighth switch S13, a fifth switch S93, and an eleventh switch S15, and a first switch S1 and a second switch S11 inside the switched capacitor boost circuit 104 are connected to the power supply bus V of the switched capacitor boost circuit 104_SYS2Then connected to the BAT pin of the charge and discharge management circuit 102, and further connected to the power supply bus V through the switch Q4 inside the charge and discharge management circuit 102_SYS1And supplying power to the system.

The operation principle of the switching boost circuit is described below by taking as an example the implementation of (1+1/3) times boost when X is 3 as shown in fig. 4:

first, the manner of turning on the switched capacitor boost circuit in the two embodiments of fig. 2 and 3 is slightly different, and will be described separately below. First, in conjunction with the embodiments shown in fig. 2 and 4, the switched capacitor boost circuit is turned on by closing Q44 and opening Q4 and powers the load electronics circuit in a second current path shown by the dashed line in fig. 2. Second, in conjunction with the embodiments shown in fig. 3 and 4, the switched capacitor boost circuit is turned on by closing the third switch Q44 and opening the fourth switch S91, the eighth switch S13, the fifth switch S93, the eleventh switch S15, the first switch S1, and the second switch S11, and the load electronics are powered in the current path shown by the dashed line in fig. 3.

Second, the first switch S1, the sixth switch S3, the ninth switch S5, and the twelfth switch S7 are closed, and the second switch S11, the eighth switch S13, the eleventh switch S15, the seventh switch S21, the tenth switch S23, the thirteenth switch S25, the fourth switch S91, and the fifth switch S93 remain open. The battery charges the capacitors C1, C3 and C5, and when no current is detected flowing through C1, C3 and C5 (or a time delay is set), indicating that C1, C3 and C5 are fully charged, the voltage across each of the capacitors C1, C3 and C5 is equal to 1/3 times the battery voltage. The current profile at this time is shown by the broken line in fig. 4.

Third, referring to fig. 5, S1, S3, S5, S7, and Q44 are opened, S11, S13, S15, S21, S23, and S25 are closed, and S91 and S93 remain open. At this time, the positive electrodes of C1, C3 and C5 are connected to Vsys, and the negative electrodes of C1, C3 and C5 are connected to the positive electrode of the battery, that is, C1, C3 and C5 are connected in parallel and then connected in series with the battery as a whole. Since the voltage across each capacitor of C1, C3, and C5 is equal to 1/3 times the battery voltage, the total voltage obtained by connecting C1, C3, and C5 in parallel and then connecting them in series with the battery as a whole is (1+1/3) times the battery voltage. Since the capacitor Csys is connected in parallel with the aforementioned C1, C3 and C5 as a whole and then connected in series with the battery, the voltage across the capacitor Csys is (1+1/3) times the battery voltage. The current profile at this time is shown by the broken line in fig. 5.

Cycling through the second and third steps described above results in a stable (1+1/3) times cell voltage across the capacitor Csys.

On the basis, if the voltage of the battery drops, the switched capacitor boosting circuit can realize (1+1/2) -time boosting, and the specific mode is as follows:

first, referring to fig. 6, S91, S5, and S7 are closed, S11, S13, S15, S21, S23, S25, S1, S3, and S93 are opened, and at this time, C3 and C5 are charged. When C3 and C5 were fully charged, the voltage on C3 and C5 were 1/2 times the battery voltage. The current profile at this time is shown by the broken line in fig. 6.

Second, referring to fig. 7, S1, S3, S5, S7 and Q44 are opened, S13, S15, S23 and S25 are closed, and S11, S21, S91 and S93 are opened. At this time, the positive electrodes of C3 and C5 are connected to Vsys, and the negative electrodes of C3 and C5 are connected to the positive electrode of the battery, that is, C3 and C5 are connected in parallel and then connected in series with the battery as a whole. Since the voltage of each capacitor of C3 and C5 is equal to 1/2 times of the battery voltage, the total voltage obtained by connecting C3 and C5 in parallel and then connecting the capacitors in series as a whole is (1+1/2) times of the battery voltage, and since the capacitor Csys is connected in parallel with the C3 and C5 and then connected in parallel with the total circuit after connecting the capacitors in series, the voltage of the capacitor Csys is (1+1/2) times of the battery voltage. The current profile at this time is shown by the broken line in fig. 7.

Cycling through the first and second steps described above results in a stable (1+1/2) times cell voltage across the capacitor Csys.

On this basis, if the voltage of the battery further drops, the switched capacitor boosting circuit can also realize (1+1/1) -time boosting, and the specific mode is as follows:

in the first step, please refer to fig. 8, the closures S93 and S7, and S11, S13, S15, S21, S23, S25, S1, S3, S5, and S91 are opened. When the battery charges C5, the voltage on the C5 capacitor equals the battery voltage when the battery fully charges C5. The current profile at this time is shown by the broken line in fig. 8.

In the second step, please refer to fig. 9, S1, S3, S5, S7 and Q44 are opened, S15 and S25 are closed, and S91, S93, S11, S21, S13 and S23 are opened. At this time, the positive electrode of C5 is connected to Vsys, and the negative electrode of C5 is connected to the positive electrode of the battery, i.e. C5 is connected in series with the battery. Since the voltage across the capacitor C5 is equal to the battery voltage, the total voltage obtained by connecting C5 in series with the battery is 2 times the battery voltage, and since the capacitor Csys is connected in parallel with the aforementioned total circuit of C5 in series with the battery, the voltage across the capacitor Csys is (1+1/1) times the battery voltage. The current profile at this time is shown by the broken line in fig. 9.

Cycling through the first and second steps described above results in a stable (1+1/1) times cell voltage across the capacitor Csys.

The operating principle of the switching boost circuit is described above by way of example, and a method for determining the boost magnification of the switching boost circuit, that is, a method for taking the value of X, is described below:

first, a maximum operating voltage Vmax and a minimum operating voltage Vmin (for example, Vmin is 3.4 and Vmax is 4.7) at which the system can normally operate are determined according to the specification of the battery-powered load electronic circuit 105 in the terminal. It should be noted that, for different terminals, the maximum operating voltage and the minimum operating voltage at which the system can normally operate may be different, and are not limited herein.

And secondly, determining the maximum initial boosting multiplying power of the switched capacitor boosting circuit according to Vmax and Vmin, wherein the boosting multiplying power (1+1/X) needs to meet the condition that Vmax/Vmin is less than or equal to (1+ 1/X). Taking Vmin as 3.4 and Vmax as 4.7 as examples, the maximum initial boosting magnification is (1+1/3) times because 4.7/3.4 as 1.382352941176471. It is understood that the (1+1/3) times is the maximum initial boosting multiplying factor, and the initial boosting multiplying factor of the switching booster circuit may be smaller multiplying factors such as (1+1/4) and (1+1/5) when the conditions allow, and is not limited herein.

And thirdly, after determining the initial boosting multiplying power of the switched capacitor boosting circuit, further determining when the voltage of the battery meets the conditions, and starting the switched capacitor boosting circuit. Specifically, taking (1+1/3) times as the initial voltage boosting rate as an example, for example, Vmax is 4.7, and 4.7/(1+1/3) is 3.525, then the switching voltage boosting circuit may be turned on and the voltage of the battery may be boosted (1+1/3) times when the voltage of the battery is lower than 3.525V during the discharging process of the battery. In addition, since 3.4/(1+1/3) ═ 2.55, the voltage of the battery can be increased by a factor of (1+1/3) in the interval of more than 2.55 and less than 3.525.

As the battery voltage decreases, if the voltage approaches Vmin after the voltage boosting process is performed on the battery voltage by (1+1/3) times, it is necessary to consider performing the voltage boosting process on the battery voltage at a larger rate, and therefore it is necessary to determine the maximum boosting rate allowed by the terminal. As is apparent from the above description, the terminal can acquire the discharge cutoff voltage Vbat of the battery in a low temperature or aged state, i.e., if the voltage of the battery reaches the discharge cutoff voltage, the battery will stop discharging. The maximum boosting multiplying power (1+1/X) allowed by the terminal needs to meet the condition that (1+1/X) ≦ Vmax/Vbat. Taking Vbat 2.5 and Vmax 4.7 as examples, the maximum boost ratio allowed at the end is (1+1/2) times because 4.7/2.5 is 1.88.

When the maximum boosting rate allowed by the terminal is determined, the boosting mode with higher rate can be determined when the voltage of the battery meets the condition by referring to the above mode. For example, Vmax is 4.7 and Vmin is 3.4, 4.7/(1+1/2) is 3.133 and 3.4/(1+1/3) is 2.55, which means that a boosting rate of (1+1/2) times can be adopted when the voltage of the battery is less than 3.133V, and a voltage after (1+1/3) times boosting processing is performed when the voltage of the battery reaches 2.55V will not satisfy system requirements, so in the process of decreasing the voltage of the battery, the boosting rate of (1+1/2) times is switched when the voltage of the battery reaches 3.133 and does not reach 2.55 yet, and a boosting rate of (1+1/2) times can be adopted until the voltage of the battery reaches Vbat.

Referring to the above description, in practical applications, different boosting rates and the boosting rate used by the voltage of the battery at different stages can be determined according to Vmax, Vmin and Vbat of the terminal. The switch booster circuit multiplies the voltage of the battery and then supplies power to the load electronic circuit. Generally, the higher the voltage of the battery, the smaller the rate required.

The above embodiment describes one structure type of the switch capacitor voltage boosting circuit, and the operation principle of the switch capacitor voltage boosting circuit is described below with reference to another structure of the switch capacitor voltage boosting circuit:

referring to fig. 10, fig. 10 is a schematic circuit diagram of another circuit structure of the switch capacitor voltage boosting circuit in the terminal according to the embodiment of the present application, and it can be seen that the difference between fig. 10 and fig. 4 is that the embodiment shown in fig. 4 is a single-phase circuit, and the embodiment shown in fig. 10 is a two-phase circuit. The switched capacitor boost circuit shown in fig. 10 can be regarded as a two-phase boost circuit group, and the two-phase boost circuit group includes two boost sub-circuits, the number of elements in the two boost sub-circuits is the same, and the arrangement and connection relationship of the elements are also the same, if the battery and the circuit on the left side of Q44 in fig. 4 are regarded as one boost sub-circuit, then fig. 10 realizes the symmetrical duplication of the circuit on the left side of the central axis with the battery and Q44 as the central axis on the basis of fig. 4. The embodiment shown in fig. 10 has the advantages that the two-phase switched capacitor boost circuit has higher efficiency, the input ripple current is smaller, and the output ripple voltage is smaller.

As can be seen from fig. 10, the switched capacitor boost circuit is composed of a capacitor and a switch, and the battery is connected to the power supply bus V through the switch Q4 inside the charge and discharge management circuit 102 under the normal discharge state of the terminal corresponding to the embodiment shown in fig. 2_SYSAnd supplying power to the system. In a state of normal discharge corresponding to the terminal of the embodiment shown in fig. 3, the battery can be charged by closing the switches Q44, S1 and S11, S91 and S13, S93 and S15, the fourteenth switch S2 and the fifteenth switch S12, the sixteenth switch S92 and the twentieth switch S14, inside the switched capacitor voltage boosting circuit 104,Seventeenth switch S94 and twentieth switch S16, power supply bus V connected to switched capacitor boost circuit 104_SYS2Then connected to the BAT pin of the charge and discharge management circuit 102, and further connected to the power supply bus V through the switch Q4 inside the charge and discharge management circuit 102_SYS1And supplying power to the system.

The operation principle of the switching boost circuit is described below with reference to fig. 10, taking as an example that (1+1/3) times boost is realized when X is equal to 3:

first, the manner of turning on the switched capacitor boost circuit in the two embodiments of fig. 2 and 3 is slightly different, and will be described separately below. First, in conjunction with the embodiments shown in fig. 2 and 10, the switched capacitor boost circuit is turned on by closing Q44 and opening Q4 and powers the load electronics circuit in a second current path shown by the dashed line in fig. 2. In connection with the embodiments shown in fig. 3 and 10, the switched capacitor boost circuit is turned on by closing Q44 and opening S1 and S11, S91, S13, S93, S15, S2 and S12, S92, S14, S94 and S16 and powers the load electronics along the current path shown by the dashed line in fig. 3.

In a second step, S1, S3, S5, S7, fifteenth switch S12, twentieth switch S14, twentieth switch S16, nineteenth switch S22, twenty-second switch S24 and twenty-fifth switch S26 are closed, and S11, S13, S15, S21, S23, S25, fourteenth switch S2, eighteenth switch S4, twenty-first switch S6, twenty-fourth switch S8, S91, S93, sixteenth switch S92 and seventeenth switch S94 are opened. When the batteries charge C1, C3 and C5, and when the batteries charge C1, C3 and C5 fully, the voltage of each capacitor of C1, C3 and C5 is equal to 1/3 times of the battery voltage. At the same time, the load electronic circuit can be powered by combining the battery and the C2, C4 and C6. The current profile at this time is shown by a broken line in fig. 10.

Third, referring to fig. 11, S1, S3, S5, S7, S12, S14, S16, S22, S24, S26, S91, S93, S92, S94, and Q44 are opened, and S11, S13, S15, S21, S23, S25, S2, S4, S6, and S8 are closed. When the batteries charge C2, C4 and C6, and when the batteries charge C2, C4 and C6 fully, the voltage of each capacitor of C2, C4 and C6 is equal to 1/3 times of the battery voltage. Meanwhile, the positive electrodes of C1, C3 and C5 are connected to Vsys, and the negative electrodes of C1, C3 and C5 are connected to the positive electrode of the battery, namely C1, C3 and C5 are connected in parallel and then connected in series with the battery as a whole. Since the voltage of each capacitor of C1, C3 and C5 is equal to 1/3 times of the battery voltage, the total voltage obtained by connecting C1, C3 and C5 in parallel and then connecting the capacitors in series as a whole is (1+1/3) times of the battery voltage, and since the capacitor Csys is connected in parallel with the above-mentioned capacitors of C1, C3 and C5 and then connected in parallel with the total circuit of the batteries in series as a whole, the voltage of the capacitor Csys is (1+1/3) times of the battery voltage. At the same time, the load electronic circuit can be powered by combining the battery and the C1, C3 and C5. The current profile at this time is shown by a broken line in fig. 11.

After the third step is completed, the state of the second step is repeated, the battery charges C1, C3 and C5, and when the battery fully charges C1, C3 and C5, the voltage of each capacitor of C1, C3 and C5 is equal to 1/3 times of the battery voltage; meanwhile, the anodes of C2, C4 and C6 are connected to Vsys, and the cathodes of C2, C4 and C6 are connected to the anode of the battery, namely C2, C4 and C6 are connected in parallel and then connected with the battery in series as a whole. Since the voltage across each capacitor of C2, C4, and C6 is equal to 1/3 times the battery voltage, the total voltage obtained by connecting C2, C4, and C6 in parallel to the battery as a whole is (1+1/3) times the battery voltage, and since the capacitor Csys is connected in parallel to the aforementioned C2, C4, and C6 in parallel to the total circuit of the battery as a whole in series, the voltage across the capacitor Csys is (1+1/3) times the battery voltage.

As can be seen from the above description, in the present embodiment, C1, C3, C5, C2, C4, and C6 are charged in turn, and even when the voltages of C1, C3, and C5 are insufficient and charging is required, the switched capacitor voltage boost circuit can still use C2, C4, and C6 to maintain the boost rate (1+1/3) times, without waiting for C1, C3, and C5 to be fully charged as in the embodiments shown in fig. 4 and 5, so that the operating efficiency of the switched capacitor voltage boost circuit is improved.

first, please refer to fig. 12, close S91, S5, S7, S14, S16, S24, and S26; disconnecting S11, S13, S15, S21, S23, S25, S2, S4, S6, S8, S1, S3, S12, S22, S93, S92, and S94; when the batteries charge C3 and C5, the voltage on each capacitor of C3 and C5 is 1/2 times of the battery voltage after the batteries charge C3 and C5. At the same time, a battery and C4, C6 may be incorporated to power the load electronics. The current profile at this time is shown by the broken line in fig. 12.

Second, please refer to fig. 13, close S13, S15, S23, S25, S92, S6, and S8, open S1, S3, S5, S7, S12, S14, S16, S22, S24, S26, S2, S4, S11, S21, S91, S93, S94, and Q44. When the batteries charge C4 and C6, and when the batteries fully charge C4 and C6, the voltage of each capacitor of C4 and C6 is equal to 1/2 times of the battery voltage; meanwhile, the positive electrodes of C3 and C5 are connected to Vsys, and the negative electrodes of C3 and C5 are connected to the positive electrode of the battery, namely C3 and C5 are connected in parallel and then connected with the battery in series as a whole. Since the voltage of each capacitor of C3 and C5 is equal to 1/2 times the battery voltage, the total voltage obtained by connecting C3 and C5 in parallel and then connecting them in series with the battery as a whole is (1+1/2) times the battery voltage, and since the capacitor Csys is connected in parallel with the aforementioned C3 and C5 and then connected in parallel with the total circuit after connecting them in series with the battery as a whole, the voltage on the capacitor Csys is (1+1/2) times the battery voltage. At the same time, a battery and C3, C5 may be incorporated to power the load electronics. The current profile at this time is shown by the broken line in fig. 13.

After the second step is completed, the state of the first step is repeated, the batteries charge C3 and C5, and when the batteries fully charge C3 and C5, the voltage of each capacitor of C3 and C5 is equal to 1/2 times of the battery voltage; meanwhile, the anodes of C4 and C6 are connected to Vsys, and the cathodes of C4 and C6 are connected to the anode of the battery, namely C4 and C6 are connected in parallel and then connected with the battery in series as a whole. Since the voltage of each capacitor of C4 and C6 is equal to 1/2 times the battery voltage, the total voltage obtained by connecting C4 and C6 in parallel and then connecting them in series with the battery as a whole is (1+1/2) times the battery voltage, and since the capacitor Csys is connected in parallel with the aforementioned C4 and C6 and then connected in parallel with the total circuit after connecting them in series with the battery as a whole, the voltage on the capacitor Csys is (1+1/2) times the battery voltage.

first, please refer to fig. 14, closing S93, S7, S16 and S26, opening S11, S13, S15, S21, S23, S25, S2, S4, S6, S8, S1, S3, S5, S12, S14, S22, S24, S91, S92 and S94. When the battery charges C5, the voltage of C5 is equal to 1/1 times the battery voltage when the battery is fully charged to C5. At the same time, a battery and C6 may be incorporated to power the load electronics. The current profile at this time is shown by a broken line in fig. 14.

Second, please refer to fig. 15, closing S15, S25, S8 and S94, opening S1, S3, S5, S7, S12, S14, S16, S22, S24, S26, S2, S4, S6, S11, S13, S21, S23, S91, S93, S92 and Q44. When the battery charges C6, the voltage of C6 is equal to 1/1 times of the battery voltage when the battery fully charges C6; meanwhile, the positive pole of the C5 is connected to Vsys, and the negative pole of the C5 is connected to the positive pole of the battery, namely, the C5 is connected with the battery in series. Since the voltage of C5 is equal to 1/1 times the battery voltage, the total voltage obtained by connecting C5 in series with the battery is (1+1/1) times the battery voltage, and since the capacitor Csys is connected in parallel with the aforementioned total circuit of C5 and the battery in series, the voltage across the capacitor Csys is (1+1/1) times the battery voltage. At the same time, a battery and C5 may be incorporated to power the load electronics. The current profile at this time is shown by a broken line in fig. 15.

After the second step is completed, the state of the first step is repeated, wherein the battery charges C5, and when the battery fully charges C5, the voltage of C5 is equal to 1/1 times the battery voltage; meanwhile, the positive pole of the C6 is connected to Vsys, and the negative pole of the C6 is connected to the positive pole of the battery, namely, the C6 is connected with the battery in series. Since the voltage at C6 is equal to 1/1 times the battery voltage, the total voltage obtained by connecting C6 and the battery in series is (1+1/1) times the battery voltage, and since the capacitor Csys is connected in parallel with the aforementioned total circuit of C6 and the battery in series, the voltage at the capacitor Csys is (1+1/1) times the battery voltage.

The above embodiments describe powering the load electronics after a (1+1/X) time boosting process of the battery voltage using a switched capacitor boost circuit. In addition, as can be seen from the embodiments shown in fig. 2 and 3, the battery is normally charged by the charge and discharge management circuit 102, that is, the charge connection port 101 is connected to the charge and discharge management circuit 102 via the charge bus Vbus, and the battery is charged by the charge and discharge management circuit 102.

For this reason, the terminal provided in this embodiment of the application may further include a switched capacitor voltage-reducing circuit, and the charging BUS Vbus may be charged to the battery after voltage-reducing processing by the switched capacitor voltage-reducing circuit, specifically, referring to the embodiments shown in fig. 2 and fig. 3, the charging BUS Vbus is further connected to the BUS end of the switched capacitor voltage-reducing circuit. The switched capacitor voltage reduction circuit and the switched capacitor voltage boosting circuit share part of components, and the circuit structure and the working principle of the switched capacitor voltage reduction circuit are introduced in combination with the accompanying drawings as follows:

referring to fig. 16, fig. 16 is a schematic circuit structure diagram of a switching capacitor voltage-reducing circuit in a terminal provided in the present application, where fig. 16 is taken as an example that the number of capacitors connected in series in a network from a battery anode to a battery cathode is 3, it can be understood that in practical applications, the number of capacitors connected in series in the network from the battery anode to the battery cathode may be other, and the present application is not limited thereto.

As can be seen from fig. 16 with respect to fig. 4, the switched-capacitor voltage-reducing circuit in fig. 16 further includes S17 and S27 connected after the Vbus input, and the switched-capacitor voltage-reducing circuit also shares C5, S7, and S25 with the switched-capacitor voltage-boosting circuit shown in fig. 4.

On the basis, the working principle of the switched capacitor voltage reduction circuit is described as follows:

in the first step, the twenty-sixth switches S17 and S25 are closed, the S7 and the twenty-seventh switch S27 are opened, and Vbus charges C5, CO and the battery through S17 and S25, the voltage on CO is equal to the battery voltage because CO and the battery are connected in parallel, and in addition, the capacitance parameters of C5 and C0 may be consistent, so that after the capacitor is fully charged, VC5 is VCO 1/2 Vbus. The current profile at this time is shown by a broken line in fig. 16.

In the second step, please refer to fig. 17, S7 and S27 are closed, and S17 and S25 are opened. The battery is charged by the capacitor. The current profile at this time is shown by a broken line in fig. 17.

The first step and the second step are repeated circularly to obtain stable battery voltage, namely Vbat is 1/2 Vbus.

It should be noted that the switched capacitor voltage reduction circuit in the above embodiment is described with a voltage reduction ratio of 1/2 times, and other voltage reduction ratios such as 1/3, 1/4, 1/5 … 1/X and the like can be realized in practical applications.

In this embodiment, the Vbus bus charges the battery more efficiently through the switched capacitor voltage reduction circuit, generates less heat, and can be suitable for a fast charging scenario in which a large current is charged. Meanwhile, the switched capacitor voltage reducing circuit and the switched capacitor voltage increasing circuit share a part of capacitors and switching devices, namely the switched capacitor voltage increasing circuit and the switched capacitor voltage reducing circuit are not required to be completely and independently opened, and the area and the cost of the whole system are saved.

The above embodiment describes a structure type of the switch capacitor voltage-reducing circuit, and the following introduces the operating principle of the switch capacitor voltage-reducing circuit in combination with another structure of the switch capacitor voltage-reducing circuit:

referring to fig. 18, fig. 18 is a schematic diagram of another circuit structure of the switch capacitor voltage-reducing circuit in the terminal provided in the present application, and it can be seen that the difference between fig. 18 and fig. 16 is that the embodiment shown in fig. 16 is a single-phase circuit, and the embodiment shown in fig. 18 is a two-phase circuit. Specifically, the switched capacitor voltage-reducing circuit shown in fig. 18 may be regarded as a two-phase voltage-reducing circuit group, and the two-phase voltage-reducing circuit group includes two voltage-reducing sub-circuits, the number of elements in the two voltage-reducing sub-circuits is the same, and the placement and connection relationship of the elements may also be the same, if the circuits of the battery and the left side portion of Q44 in fig. 16 are regarded as one voltage-reducing sub-circuit, then fig. 18 realizes the symmetrical duplication of the circuit on the left side of the central axis with the battery and Q44 as the central axis on the basis of fig. 16. The embodiment shown in fig. 18 has the advantages that the two-phase switched capacitor buck circuit has higher efficiency, smaller ripple current at the input and smaller ripple voltage at the output.

The working principle of the switching capacitor voltage reduction circuit in this embodiment is described below with reference to fig. 18:

in the first step, S17, S25, twenty-ninth switches S28, S8 are closed, S7, S27, and twenty-eighth switches S18, S26 are opened, and Vbus charges C5, CO, and the battery through S17, S25. At the same time, C6 also charges the CO and the battery. The current profile at this time is shown by the dashed line in fig. 18.

Referring to fig. 19, S17, S25, S28, S8 are opened, S7, S27, S18, S26 are closed, and Vbus charges C6, CO and the battery through S18, S26. At the same time, C5 also charges the CO and the battery. The current profile at this time is shown by the dashed line in fig. 19.

The stable battery voltage, namely the battery voltage is 1/2Vbus, can be obtained by circularly repeating the first step and the second step.

Similarly, other voltage reduction multiplying powers such as 1/3, 1/4, 1/5 … 1/X and the like can be realized, and the detailed process is not described herein.

In the following, taking the example that the terminal in the embodiment of the present application is a mobile phone, various components and functions in the mobile phone are introduced:

referring to fig. 20, the mobile phone 200 includes: a Radio Frequency (RF) circuit 210, a memory 220, an input unit 230, one or more sensors 240, a processor 250, a power supply 260, a display unit 270, an audio circuit 280, and the like. Those skilled in the art will appreciate that the handset configuration shown in fig. 20 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The functional components of the mobile phone 200 are described below:

the RF circuit 210 may be used for receiving and transmitting signals during a message transmission or a call. Wherein, after receiving the downlink information of the base station, the downlink information is sent to the processor 250 for processing; in addition, the uplink data is transmitted to the base station. In general, the RF circuit 210 is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 210 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to global system for mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), 5G standard or protocol, standard or protocol for subsequent evolution, email, Short Message Service (SMS), and so on.

The memory 220 may be used for storing software programs, and the processor 250 executes various functional applications of the mobile phone 200 by executing the software programs stored in the memory 220. The memory 220 may include a program storage area, wherein the program storage area may store an operating system, and may also store required Application programs (APPs), such as a sound playing function, an image playing function, and the like. Further, the memory 220 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 230 may be used to receive numeric or character information input by a user and generate key signal inputs related to user settings and function control of the cellular phone 200. Specifically, the input unit 230 may include a touch screen 231 and other input devices 232. The touch screen 231, also referred to as a touch panel, may collect a touch operation performed by a user on or near the touch screen 231 (e.g., an operation performed by the user on or near the touch screen 231 using any suitable object or accessory such as a finger or a stylus), and drive the corresponding connection device according to a preset program. Alternatively, the touch screen 231 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 250, and can receive and execute commands sent by the processor 250. In addition, the touch screen 231 may be implemented in various types, such as resistive, capacitive, infrared, and surface acoustic wave. The input unit 230 may include other input devices 232 in addition to the touch screen 231. In particular, other input devices 232 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, power switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The sensor 240 includes a sensor for performing biometric recognition, such as a fingerprint recognition sensor, a face recognition sensor, and an iris recognition sensor. Taking a fingerprint identification sensor as an example, the fingerprint identification sensor can collect fingerprint information of a user and report the collected fingerprint information to the processor 250, and the processor 250 identifies the user according to the fingerprint information.

The sensor 240 further includes a gravity sensor (gravity sensor), which can detect the acceleration of the mobile phone in each direction (generally three axes), detect the gravity when the mobile phone is stationary, and can be used for applications of recognizing the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), and the like.

Cell phone 200 may also include other sensors, such as light sensors. In particular, the light sensor may include an ambient light sensor and a proximity light sensor. The ambient light sensor may adjust the brightness of the touch screen 231 according to the brightness of ambient light; the proximity light sensor may detect whether an object is near or touching the phone, and may turn off the touch screen 231 and/or the backlight when the phone 200 is moved to the ear. The mobile phone 200 may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which are not described herein again.

The display unit 270 may be used to display information input by or provided to the user and various menus of the cellular phone 200. The Display unit 270 may include a Display panel 271, and optionally, the Display panel 271 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like. Further, the touch screen 231 may cover the display panel 271, and when the touch screen 231 detects a touch operation thereon or nearby, the touch screen is transmitted to the processor 250 to determine the type of the touch event, and then the processor 250 provides a corresponding visual output on the display panel 271 according to the type of the touch event. Although in fig. 20 the touch screen 231 and the display panel 271 are two separate components to implement the input and output functions of the mobile phone 200, in some embodiments, the touch screen 231 and the display panel 271 may be integrated to implement the input and output functions of the mobile phone 200, for example, the integration of the touch screen and the display panel 271 may be called a touch display screen.

Audio circuitry 280, speaker 281, microphone 282 may provide an audio interface between a user and cell phone 200. The audio circuit 280 may transmit the electrical signal converted from the received audio data to the speaker 281, and convert the electrical signal into a sound signal for output by the speaker 281; on the other hand, the microphone 282 converts the collected sound signals into electrical signals, which are received by the audio circuit 2180 and converted into audio data, which are output to the RF circuit 210 for transmission to, for example, another cell phone, or output to the memory 220 for further processing.

The processor 250 is a control center of the cellular phone 200, connects various parts of the entire cellular phone using various interfaces and lines, and performs various functions of the cellular phone 200 by operating or executing software programs stored in the memory 220 and calling data stored in the memory 220. In one implementation, processor 250 may include one or more processing units. In one implementation, processor 250 may integrate an application processor that handles primarily the operating system, user interface, application programs, etc. and a modem processor that handles primarily wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 250.

The handset 200 further includes a power supply 260 (e.g., a battery) for supplying power to various components, and optionally, the power supply 260 may be logically connected to the processor 250 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system. It should be noted that the power supply 260 and the power management system may be specifically implemented by the circuit structure in any embodiment of fig. 2 to fig. 19, and are not described herein again.

Although not shown, the handset 200 may also include an antenna, a Wireless-Fidelity (Wi-Fi) module, a Near Field Communication (NFC) module, a bluetooth module, a speaker, an accelerometer, a gyroscope, and the like.

The terminal and the switched capacitor boost circuit in the embodiment of the present application are mainly described in terms of hardware structures, and a power supply method provided in the embodiment of the present application is introduced as follows:

the power supply method provided by the embodiment of the application can be specifically applied to the terminal shown in any one of the embodiments of fig. 2 to 19.

Referring to fig. 21, an embodiment of a power supply method in the embodiment of the present application includes:

201. target parameters of the battery are obtained.

In this embodiment, the terminal obtains a target parameter of the battery 103, where the target parameter may be the temperature of the battery 103 or the number of charge and discharge cycles of the battery 103, or may be the temperature of the battery 103 and the number of charge and discharge cycles of the battery 103. Specifically, in the discharging process of the battery 103 in the normal state, discharging is performed according to the first current trend in fig. 2 (Q4 is closed), the main control module 106 collects the current of the battery 103, and if the discharging current of the battery 103 is greater than a preset discharging current threshold, it is determined that the battery 103 is in the discharging state. The charge and discharge management circuit 102 may then detect the temperature of the battery or read the number of charge and discharge cycles of the battery to obtain the target parameters of the battery.

202. If the target parameter meets the target condition, a first variable voltage of the battery is acquired.

In this embodiment, after the terminal obtains the target parameter, it needs to determine whether the target parameter meets the target condition. Specifically, if the target parameter is the temperature of the battery 103, the main control module 106 determines whether the current temperature of the battery 103 is lower than a preset temperature threshold, and if so, determines that the battery 103 is in a low-temperature environment. If the target parameter is the number of charge and discharge cycles of the battery 103, the main control module 106 determines whether the number of charge and discharge cycles of the current battery 103 is greater than a preset threshold value of the number of charge and discharge cycles, and if so, determines that the battery 103 is in an aging state. In summary, when the terminal determines that the battery 103 is in a low-temperature environment or an aging state, the terminal obtains the first variable voltage of the battery 103, and it can be understood that, since the battery 103 is in a discharging state, the voltage of the battery 103 will decrease along with the discharging, and thus the voltage that the terminal can obtain in real time is dynamically changed, i.e. the first variable voltage. In one implementation, the terminal may also periodically obtain the battery voltage. Corresponding to the above-described embodiment, assuming that the discharge cut-off voltage Vbat of the terminal in the low temperature or aged state is 2.5 and the maximum operating voltage Vmax of the load electronic circuit is 4.7, the first variable voltage may be a voltage varying between 2.5 and 4.7, for example, the first variable voltage initial value is 4.5 and gradually decreases as the battery is discharged.

203. If the first variable voltage is in the first voltage interval, the first variable voltage is subjected to boosting processing of (1+1/X) times to obtain a second variable voltage.

In this embodiment, if the first variable voltage is in the first voltage interval, the main control module 106 controls to turn on the switched capacitor voltage boost circuit 104, and performs (1+1/X) -fold voltage boost processing on the first variable voltage to obtain the second variable voltage. Wherein the product of the maximum value of the first voltage interval and (1+1/X) is less than or equal to the maximum operating voltage of the load electronic circuit 105, and the product of the minimum value of the first voltage interval and (1+1/X) is greater than or equal to the minimum operating voltage of the load electronic circuit 105. Corresponding to the above embodiment, the first voltage interval may be 2.55-3.525, where X is 3, that is, if the first variable voltage is in the voltage interval of 2.55-3.525, the switched capacitor voltage boost circuit performs (1+1/3) times of the first variable voltage to obtain the second variable voltage, it can be understood that the second variable voltage has a value in a range of 3.4-4.7.

It should be noted that, the determination manner of the first voltage interval and the initial value of (1+1/X) has already been described in the above embodiments, and is not described herein again.

204. And supplying power to the load electronic circuit with the second variable voltage.

In this embodiment, the terminal supplies power to the load electronic circuit 105 by using the boosted second variable voltage. As the voltage drop of the battery 103 further decreases with the discharge of the battery 103, the second variable voltage also tends to decrease, and if the second variable voltage cannot meet the power supply requirement of the load electronic circuit 105, the terminal needs to adjust the boosting rate. Specifically, if the first variable voltage is in the second voltage interval, the main control module 106 controls the switched capacitor voltage boost circuit 104 to increase the boost ratio, the switched capacitor voltage boost circuit 104 performs (1+1/K) times of boost processing on the first variable voltage to obtain a third variable voltage, and the third variable voltage is used to supply power to the load electronic circuit 105, where K is an integer greater than or equal to 1 and less than X. Corresponding to the above embodiment, the second voltage interval may be 2.5 to 3.133, where X is 2, that is, if the first variable voltage is in the voltage interval of 2.5 to 3.133, the switched capacitor boost circuit performs (1+1/2) -fold boosting on the first variable voltage to obtain the third variable voltage, and it can be understood that the value range of the third variable voltage is between 3.75 and 4.7.

It should be noted that the minimum value of K is the minimum integer satisfying a preset condition in the value of K, where the preset condition is 1+1/K < U1/U2, U1 is the maximum operating voltage of the load electronic circuit 105, and U2 is the discharge cutoff voltage of the battery 103. The manner of calculating the discharge cut-off voltage of the battery 103 has been described in the above embodiments, and is not described herein again.

It is understood that the parameters of C1, C3, C5, C2, C4 and C6 mentioned in the above embodiments may be the same. C1, C3, C5, C2, C4 and C6 may be selected according to the actual situation of the terminal. The parameters of C0 and Csys may be different from or the same as those of C1, C3, C5, C2, C4, and C6.

The terminal in the embodiment of the application can be a terminal with a battery, such as a mobile phone, a tablet computer, a wearable device, an earphone, virtual reality glasses, an electronic reader and the like.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A terminal, comprising: the charging and discharging management circuit comprises a charging connection port, a charging and discharging management circuit, a battery, a switched capacitor boosting circuit, a load electronic circuit and a main control module;

the charging connection port is used for connecting a power supply device;

the charging and discharging management circuit is used for performing charging management or discharging management on the battery;

the switched capacitor boosting circuit is used for boosting the voltage of the battery by (1+1/X) times and supplying power to the load electronic circuit by using the boosted voltage, wherein X is an integer greater than or equal to 1;

the main control module is used for acquiring target parameters of the battery; if the target parameter meets a target condition, acquiring the voltage of the battery; if the voltage of the battery is in a preset voltage interval, controlling the switch capacitor boosting circuit to be switched on or switched off according to the voltage of the battery; wherein the product of the maximum value of the preset voltage interval and the (1+1/X) is less than or equal to the maximum working voltage of the load electronic circuit, and the product of the minimum value of the preset voltage interval and the (1+1/X) is greater than or equal to the minimum working voltage of the load electronic circuit.

2. The terminal of claim 1,

the target parameters comprise the temperature of the battery and/or the charge-discharge cycle number of the battery, and the target conditions comprise a preset temperature threshold and/or a preset charge-discharge cycle number threshold;

and if the temperature of the battery is lower than the preset temperature threshold value and/or if the charge-discharge cycle number of the battery is greater than the preset charge-discharge cycle number threshold value.

3. The terminal according to claim 1 or 2, further comprising a first capacitor and a second capacitor, wherein the charging connection port is connected to the input terminal of the charging and discharging management circuit, the battery connection port of the charging and discharging management circuit is electrically connected to the positive electrode of the battery, the output port of the charging and discharging management circuit is connected to the load electronic circuit, the positive electrode of the battery is connected to the battery connection port of the switched capacitor voltage-boosting circuit, the negative electrode of the battery is grounded, the output port of the switched capacitor voltage-boosting circuit is electrically connected to the load electronic circuit, the output terminal of the main control module is respectively connected to the charging and discharging management circuit and the switched capacitor voltage-boosting circuit, one end of the first capacitor is connected to the positive electrode of the battery, and the other end of the first capacitor is grounded, one end of the second capacitor is connected with the output port of the switch capacitor boosting circuit, and the other end of the second capacitor is grounded.

4. The terminal according to claim 1 or 2, further comprising a first capacitor and a second capacitor, wherein the charging connection port is connected to the input terminal of the charging and discharging management circuit, the battery connection port of the charging and discharging management circuit is connected to the output port of the switched capacitor voltage boosting circuit, the positive electrode of the battery is connected to the battery connection port of the switched capacitor voltage boosting circuit, the negative electrode of the battery is grounded, the output terminal of the main control module is connected to the charging and discharging management circuit and the switched capacitor voltage boosting circuit, respectively, one end of the first capacitor is connected to the positive electrode of the battery, the other end of the first capacitor is grounded, one end of the second capacitor is connected to the output port of the switched capacitor voltage boosting circuit, and the other end of the second capacitor is grounded.

5. A terminal as claimed in claim 1 or 2, wherein the switched capacitor boost circuit comprises a two-phase boost circuit bank comprising two boost sub-circuits which boost the voltage of the battery by a factor of (1+1/X) and power the load electronic circuit with the boosted voltage.

6. The terminal according to claim 1 or 2, further comprising a switched capacitor voltage-reducing circuit, wherein the switched capacitor voltage-reducing circuit comprises M capacitors, M is greater than or equal to 1, the switched capacitor voltage-reducing circuit is configured to perform a voltage-reducing process of 1/M +1 times on the voltage from the charging connection port, and charge the battery with the reduced voltage, wherein an input terminal of the switched capacitor voltage-reducing circuit is connected to the charging connection port, and a battery connection port of the switched capacitor voltage-reducing circuit is connected to an anode of the battery.

7. The terminal of claim 6, wherein the switched capacitor buck circuit comprises a bi-phase buck circuit set, the bi-phase buck circuit set comprising two buck sub-circuits, the two buck sub-circuits performing a 1/M + 1-fold buck process on the voltage from the charging connection port to charge the battery with the stepped-down voltage.

8. A terminal as claimed in claim 1 or 2, wherein the switched capacitor boost circuit comprises N capacitors, N being an integer greater than or equal to 1, and X being an integer less than or equal to N.

9. The terminal of claim 8, wherein M is an integer less than or equal to N.

10. The terminal of claim 1 or 2, wherein the main control module is configured to turn off the switched capacitor boost circuit if the voltage of the battery reaches a discharge cutoff voltage.

11. A terminal according to claim 1 or 2, wherein during the discharging of the voltage of the battery, the value of X decreases with the decrease of the voltage of the battery, the value of X is at least equal to 1, and the voltage of the discharged battery is greater than or equal to the discharge cut-off voltage.

12. A switched capacitor boost circuit comprising N capacitors, where N is an integer greater than or equal to 1,

the battery connection port of the switched capacitor booster circuit is used for connecting the anode of a battery;

the output port of the switched capacitor booster circuit is used for coupling a load electronic circuit;

the switched capacitor booster circuit is used for acquiring target parameters of the battery; if the target parameter meets a target condition, acquiring the voltage of the battery, and when the voltage of the battery is in a preset voltage interval, turning on or turning off the battery; wherein the product of the maximum value of the preset voltage interval and the (1+1/X) is less than or equal to the maximum working voltage of the load electronic circuit, and the product of the minimum value of the preset voltage interval and the (1+1/X) is greater than or equal to the minimum working voltage of the load electronic circuit;

the switched capacitor boosting circuit is further used for performing (1+1/X) -time boosting processing on the voltage of the battery and supplying power to the load electronic circuit by using the boosted voltage, wherein X is an integer greater than or equal to 1.

13. The switched-capacitor boost circuit of claim 12, wherein the switched-capacitor boost circuit is configured to boost the voltage of the battery by a factor of (1+1/X) and to supply the boosted voltage to the load electronic circuit, and comprises:

and the switched capacitor boosting circuit is used for boosting the voltage of the battery by (1+1/X) times when the voltage of the battery is greater than the discharge cut-off voltage and less than a preset voltage, and supplying power to the load electronic circuit by using the boosted voltage.

14. The switched capacitor boost circuit of claim 12 or 13, wherein the switched capacitor boost circuit comprises a third capacitor, a fourth capacitor, a fifth capacitor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, and a thirteenth switch;

15. The boost circuit according to claim 12 or 13, wherein the boost circuit comprises a two-phase boost circuit group, and the two-phase boost circuit group comprises two boost sub-circuits, and the two boost sub-circuits perform (1+1/X) times of boost processing on the voltage of the battery and supply power to the load electronic circuit by using the boosted voltage.

16. The switched capacitor voltage boost circuit according to any of claims 12 or 13, wherein the switched capacitor voltage boost circuit comprises a switched capacitor voltage reduction circuit, the switched capacitor voltage reduction circuit comprises M capacitors, M is an integer greater than or equal to 1, an input terminal of the switched capacitor voltage reduction circuit is connected to the charging connection port, and a battery connection port of the switched capacitor voltage reduction circuit is connected to an anode of the battery;

the switch capacitor voltage reduction circuit is used for carrying out 1/M +1 time voltage reduction processing on the voltage from the charging connection port and charging the battery by the voltage after voltage reduction.

17. The switched-capacitor boost circuit of claim 14, wherein said switched-capacitor boost circuit comprises a switched-capacitor buck circuit comprising said fifth capacitor, said twelfth switch, said thirteenth switch, a twenty-sixth switch, and a twenty-seventh switch;

18. The switched capacitor voltage boost circuit of claim 16, further comprising a switched capacitor voltage reduction circuit, wherein the switched capacitor voltage reduction circuit comprises a bi-phase voltage reduction circuit set, the bi-phase voltage reduction circuit set comprises two voltage reduction sub-circuits, the two voltage reduction sub-circuits are symmetrically arranged, and the two voltage reduction sub-circuits perform voltage reduction processing on the voltage from the charging connection port by 1/M +1 times, and charge the battery with the voltage after voltage reduction.

19. The switched capacitor boost circuit of claim 12 or 13, wherein X is an integer less than or equal to N.

20. The switched capacitor voltage boost circuit according to any one of claims 12 or 13, wherein during the discharging of the voltage of the battery, the value of X decreases with the decrease of the voltage of the battery, the value of X is at least equal to 1, and the voltage of the discharged battery is greater than or equal to the discharge cutoff voltage.

21. A method of supplying power, comprising:

acquiring target parameters of the battery;

if the voltage of the battery is in a preset voltage interval, controlling the switch capacitor boosting circuit to be switched on or switched off; wherein the product of the maximum value of the preset voltage interval and the (1+1/X) is less than or equal to the maximum working voltage of the load electronic circuit, and the product of the minimum value of the preset voltage interval and the (1+1/X) is greater than or equal to the minimum working voltage of the load electronic circuit;

when the voltage of the battery is greater than the discharge cut-off voltage and less than the preset voltage, the switched capacitor boosting circuit performs (1+1/X) times boosting processing on the voltage of the battery, and supplies power to the load electronic circuit by using the boosted voltage, wherein X is an integer greater than or equal to 1.

22. The method according to claim 21, wherein the target parameter comprises a temperature of the battery and/or a number of charge and discharge cycles of the battery, and the target condition comprises a preset temperature threshold and/or a preset number of charge and discharge cycles threshold;

23. The method according to claim 21 or 22, wherein during the discharging of the voltage of the battery, the value of X decreases with the decrease of the voltage of the battery, the value of X is at least equal to 1, and the voltage of the discharged battery is greater than or equal to a discharge cut-off voltage.