WO2021042603A1

WO2021042603A1 - Charging system and method for handheld device, and terminal device

Info

Publication number: WO2021042603A1
Application number: PCT/CN2019/122771
Authority: WO
Inventors: 张建志; 李肇光; 王栋; 陈宇
Original assignee: 深圳传音控股股份有限公司
Priority date: 2019-09-05
Filing date: 2019-12-03
Publication date: 2021-03-11
Also published as: CN110518669B; CN110518669A

Abstract

Disclosed is a charging system for a handheld device. The charging system comprises a charger and a terminal device, wherein the charger is connected to a USB interface of the terminal device. The terminal device comprises a first charging module, a second charging module, a regulation and control module, the USB interface and a battery module, wherein a control end of the first charging module and a control end of the second charging module are both connected to the regulation and control module; the USB interface is respectively connected to an input end of the first charging module and the regulation and control module; the first charging module comprises an intermediate output end and an output end; and an input end of the second charging module is connected to the intermediate output end of the first charging module, so that a load required by battery charging is allocated to the first charging module and the second charging module for transmission, thereby reducing a heat generation amount and realizing cooling. Further disclosed are a quick charging method and a terminal device.

Description

Charging system and method for handheld equipment, terminal equipment To

Technical field

This application relates to the field of charging technology, and in particular to a charging system and method for handheld devices, and terminal devices.

Background technique

In the prior art, a single charging module is likely to generate a large amount of heat due to the gradual increase in current during fast charging. Although in order to solve the heating problem during battery charging, the original high-voltage and low-current charging technology has been adopted. Improved to low-voltage and high-current charging technology and high-voltage and high-current charging technology. While realizing the improvement of charging technology, the heat generation problem during battery charging is gradually improved, but there is still a problem of easy heat generation during battery charging.

Application content

The main purpose of this application is to propose a charging system for handheld devices, which aims to distribute the load required for battery charging to the first charging module and the second charging module for transmission, so as to reduce heat generation and achieve cooling.

In order to achieve the above objective, a charging system for handheld devices proposed in this application includes a charger and a terminal device. The charger is connected to the USB interface of the terminal device. The terminal device includes a first charging module and a second charging module. A charging module, a control module, a USB interface, and a battery module, the control end of the first charging module and the control end of the second charging module are both connected to the control module, and the USB interface is respectively connected to the first charging module. The input end of the module is connected to the control module, the first charging module includes an intermediate output end and an output end, the input end of the second charging module is connected to the intermediate output end of the first charging module, and the battery The input end of the module is respectively connected with the output end of the first charging module, the output end of the second charging module, and the control module.

Optionally, the first charging module includes a shunt switch, the input end of the shunt switch is connected to the USB interface, and the output end of the shunt switch includes an intermediate output end and an internal output end. The output terminal is connected with the input terminal of the second charging module, and the internal output terminal of the shunt switch is connected with the charging control circuit of the first charging module.

In order to achieve the above objective, this application also proposes a terminal device, which includes:

Battery module

USB interface, used to connect the charger;

A first charging module and a second charging module. The first charging module includes an intermediate output terminal and an output terminal. The intermediate output terminal of the first charging module is connected to the input terminal of the second charging module. The input terminal of the charging module is connected with the output terminal of the USB interface, and the output terminal of the first charging module and the output terminal of the second charging module are both connected with the input terminal of the battery module.

Optionally, the terminal device further includes a control module, which is respectively connected to the first charging module and the second charging module, and at the same time the D+ pin, D- pin and ID of the control module The pin is connected to the power interface module, and the control module controls the operation of the first charging module and the second charging module.

Optionally, the voltage of the first charging module is lower than the voltage of the second charging module.

In order to achieve the above objective, this application also proposes a fast charging method for a handheld device, which is applied to a handheld device, wherein the handheld device includes a battery module, a USB interface, a first charging module, a second charging module, and a control module , The fast charging method includes:

After detecting that a fast charging charger is inserted into the USB interface, obtain the charging current value of the first charging module;

The charging current value of the second charging module is adjusted according to the charging current value of the first charging module.

Optionally, the step of adjusting the charging current value of the second charging module according to the charging current value of the first charging module includes:

Judging whether the charging current value of the first charging module is less than a first preset current value;

If the charging current value of the first charging module is less than the first preset current value, adjusting the charging current value of the second charging module.

Optionally, if the charging current value of the first charging module is less than the first preset current value, the step of adjusting the charging current value of the second charging module includes:

If the charging current value of the first charging module is less than the first preset current value, acquiring the charging current value of the second charging module;

Determining whether the charging current value of the second charging module is greater than or equal to a second preset current value, wherein the second preset current value is less than the first preset current value;

If the charging current value of the second charging module is greater than or equal to the second preset current value, adjusting the charging current value of the second charging module.

Optionally, if the charging current value of the second charging module is greater than or equal to the second preset current value, the step of adjusting the charging current value of the second charging module includes:

If the charging current value of the second charging module is greater than or equal to the second preset current value, obtaining a preset drop value;

Adjusting the charging current value of the second charging module to decrease the preset decreasing value.

Optionally, after the step of determining the magnitude of the charging current value of the second charging module and the preset cut-off current value, the method further includes:

If the charging current value of the second charging module is less than the second preset current value, controlling the charging circuit of the second charging module to turn off.

Optionally, after the step of controlling the disconnection of the charging circuit of the second charging module, the method further includes:

Judging the magnitude of the charging current value of the first charging module and the second preset current value;

If the charging current value of the first charging module is less than the second preset current value, controlling the charging circuit of the first charging module to be turned off.

The technical solution of the present application charges the battery at the same time through two parallel charging circuits, which speeds up the charging speed and distributes the charging power required by the battery to the two parallel charging circuits for transmission, so as to realize energy distribution, so that The charging load that each charging circuit has to bear when charging is reduced, which reduces the heat generation and realizes cooling.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structure shown in these drawings.

Figure 1 is a schematic diagram of the connection of the charging system of this application;

2 is a schematic diagram of the connection between the first charging module and the second charging module in the charging system of this application;

FIG. 3 is a schematic flowchart of a first embodiment of a fast charging method according to this application;

4 is a schematic flowchart of a second embodiment of a fast charging method according to this application;

5 is a schematic flowchart of a third embodiment of a fast charging method according to this application;

FIG. 6 is a schematic flowchart of a fourth embodiment of a fast charging method according to this application;

FIG. 7 is a schematic flowchart of a fifth embodiment of a fast charging method according to this application.

The realization, functional characteristics, and advantages of the purpose of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the application, and not used to limit the application.

The main solution of the embodiment of the present application is: two charging circuits are connected between the USB interface and the battery, and the charging power required by the battery is allocated to two parallel charging circuits while meeting the battery's power demand and charging speed. To realize energy distribution, the charging load that each charging circuit has to bear when charging is reduced, the heat generation is reduced, and the temperature is reduced.

Because the single charging circuit in the prior art is likely to generate a large amount of heat due to the gradual increase in current during fast charging, although in order to solve the heating problem during battery charging, the original high-voltage and low-current charging technology has been adopted. Improved to low-voltage and high-current charging technology and high-voltage and high-current charging technology. While realizing the improvement of charging technology, the heat generation problem during battery charging is gradually improved, but there is still a problem of easy heat generation during battery charging.

This application provides a terminal device. Two charging circuits are connected between the USB interface and the battery, and the charging power required by the battery is distributed to two parallel charging circuits under the condition that the battery power demand and charging speed are met. Transmission on the circuit to realize the distribution of energy, so that the charging load that each charging circuit has to bear when charging is reduced, the heat generation is reduced, and the temperature is reduced.

As shown in Figure 1, the terminal device includes:

Battery module 4;

USB port 5, used to connect the charger;

The first charging module 1 and the second charging module 2, the first charging module 1 and the second charging module 2 are connected in parallel, and the input terminals of the first charging module 1 and the second charging module 2 are connected to all The output terminal of the USB interface 5 is connected, and the output terminals of the first charging module 1 and the second charging module 2 are both connected to the input terminal of the battery module 4.

Those skilled in the art can understand that the circuit of the terminal shown in FIG. 1 does not constitute a limitation on the terminal, and may include more or fewer elements than shown in the figure, or a combination of some elements, or different element arrangements.

Further, a terminal device may also include a control module 3, which is connected to the first charging module 1 and the second charging module 2 respectively, and at the same time, the D+ pin of the control module 3, The D-pin and the ID pin are connected to the power interface module 5, and the control module 3 controls the operation of the two charging circuits.

Wherein, the above-mentioned terminal device is built into terminal devices such as mobile phones when in use, and includes a first charging module 1, a second charging module 2, a control module 3, a USB interface 5, and a battery module 4. The USB interface 5 is connected to the first charging module 4, respectively. The charging module 1, the second charging module 2, and the regulating module 3 are connected, and the first charging module 1 and the second charging module 2 are both connected to the regulating module 3. As for the battery module 4, the first charging module 1 and the second charging module are connected respectively. Module 2 And the control module 3 is connected.

Preferably, the battery in the present application includes a battery cell and a battery protection board, and the battery is connected to the Bat_temp pin (ie Battery and Temperature abbreviation) of the control module to realize real-time monitoring of the battery temperature. The USB interface 5 is respectively connected to the first charging module 1 and the second charging module 2 through its VIN pin, so as to supply power to the first charging module 1 and the second charging module 2.

At the same time, the USB interface 5 is also connected to the D+ pin, D- pin, and ID pin of the control module 3. Among them, the D+ pin and the D- pin play the signal transmission function, and the ID pin is used to determine the connection. The device is the master or slave.

In addition, the first charging module 1 is also connected to the OTG pin and I2C1 pin of the control module 3; the OTG pin mainly controls the VIN pin on the USB interface 5. When the ID pin determines that the connected device is a slave When the OTG pin is used, the VIN pin of the USB interface 5 can be converted to the VOUT pin, so as to meet the different requirements of host charging and slave charging. The second charging module 2 is also connected to the control module 3 The I2C2 pin is connected, which also functions as a signal transmission.

Furthermore, the above-mentioned first charging module 1 and second charging module 2 both use TI’s 2589X charging control chip, which is controlled by I2C and supports a maximum 5A single-cell battery charging chip, and integrates power path management and OTG Function, has the following characteristics:

1. High efficiency: high power conversion efficiency of 90%;

2. High precision: charging voltage accuracy is 0.5%, current accuracy is 7%;

3. Support MTKPE+ protocol;

4. Support IR compensation function, the highest compensation is 112mV;

5. Support PP function, built-in low impedance MOS, impedance about 12mΩ.

In actual work, the principle of the charging system in this application is as follows:

1. Battery voltage <system boot voltage, low voltage charging;

2. System start-up voltage <battery voltage <80% power, fast charge OR standard charger type identification;

3. The battery power is 0% to 90%, and the charger 6 can be charged with high voltage 9V until the battery power is 90%;

4. The battery capacity is greater than 90%, and the standard charger (5V) will charge until the capacity is 100%.

Further, in order to facilitate the control module 3 to control the first charging module 1 and the second charging module 2, the constant voltage of the first charging module 1 is smaller than the constant voltage of the second charging module 2.

As shown in Figures 1 and 2, the present application also provides a charging system for mobile terminals, including a charger 6 and a terminal device 7. The terminal device 7 is the above-mentioned terminal device, and the USB of the charger 6 and the terminal device 7 The interface 5 is connected; the terminal device 7 includes a first charging module 1 and a second charging module 2, a control module 3, a USB interface 5, and a battery module 4. The USB interface 5 is connected to the first charging module 1 and the battery module 4 respectively. The control module 3 is connected, the first charging module 1 includes an intermediate output terminal and an output terminal, the input terminal of the second charging module 2 is connected to the intermediate output terminal of the first charging module 1, and the first charging module Both the module 1 and the second charging module 2 are connected to the regulating module 3, and the input ends of the battery module 4 are respectively connected to the first charging module 1, the second charging module 2 and the regulating module 3. The D+ pin, D- pin, and ID pin of the control module 3 in the mobile terminal are connected. The ID pin is used to determine the type of charger 6 connected to the USB interface 5. If the type of charger 6 is low-current charging The control module 3 stops adjusting the first charging module 1 and the second charging module 2 in the mobile terminal 7. If the charger 6 is a high-current fast charging charger, the control module 3 starts to control the mobile terminal 7 The first charging module 1 and the second charging module 2 perform charging current control. For the specific method of regulating the charging current of the control module 3, please refer to the following fast charging method to ensure the safety of the charging circuit and avoid the charging of the two charging modules The current reduction rate is too fast, which makes the charging module easy to wear, which increases the service life of the battery module 4 and the two charging modules.

The first charging module 1 includes a shunt switch Q1. The input end of the shunt switch 11 is connected to the USB interface 5. The output end of the shunt switch Q1 includes an intermediate output end I4 and an internal output end I3. The shunt switch Q1 The intermediate output terminal of the second charging module 2 is connected to the input terminal, and the internal output terminal of the shunt switch Q1 is connected to the charging control circuit 12 of the first charging module 1, wherein the first charging module 1 can limit The current flowing through the shunt switch Q1.

When the charger 6 is a fast charging charger, the charger uses the IWAT power control chip, supports the PE+ charging protocol, can output 4 levels of adjustable output 5V, 7V, 9V, 12V, and the maximum output power is 24W. Specifically: charger 6 By detecting whether the current fluctuation on the charging line matches the PE+ protocol and completing the boost, the PE+ command has two commands: step-by-step voltage step-up and direct step-down to 5V. The step-by-step step-up command is the step-up that matches the protocol. Directly drop 5V only to limit the current of the charging cable to 0mA and 250mS or more.

The present application provides a fast charging method applied to a handheld device, where the handheld device includes a battery module, a USB interface, a first charging module, a second charging module, and a control module.

Referring to FIG. 3, FIG. 3 is a schematic flowchart of a first embodiment of a fast charging method according to the present application.

This embodiment proposes a fast charging method, and the fast charging method includes:

Step S1000, after detecting that a quick charger is inserted into the USB interface, obtain the charging current value of the first charging module;

Step S2000, adjusting the charging current value of the second charging module according to the charging current value of the first charging module.

After the battery power of the mobile terminal is exhausted, the battery voltage decreases. When it is lower than a certain value, the charger will use a relatively low current to precharge the lithium battery. After a period of time, when the voltage of the lithium battery is higher than the predetermined value, it enters the second stage of high-current constant-current charging. At this time, appropriately increasing the current can accelerate the charging speed. Therefore, battery charging can be divided into three stages: trickle charging, constant current charging, and constant voltage charging, specifically:

Trickle charging: The characteristic of the battery is that when the battery voltage is very low, the internal lithium ion activity is poor and the internal resistance is large, so it can only accept a small charging current (usually about 30 to 50 mA). Otherwise, the battery is prone to heat and aging, which not only damages the battery life, but also has potential safety issues. Therefore, this stage is called trickle charging, or linear charging or pre-charging.

Constant current charging: When the battery voltage is higher than 2V, the lithium ion activity of the battery is fully activated, and the internal resistance is also small, so it can accept high current charging. At this stage, the charging chip will provide acceptable charging current to the battery according to the setting, so the battery gets the largest amount of power at this stage, which can account for 70% to 80% of the capacity.

Constant voltage charging: The battery voltage of the battery is not allowed to exceed ±50mV of the cut-off voltage, otherwise there will be a safety hazard. Therefore, when the battery voltage is charged to close to the charging cut-off voltage, the charging chip must be able to automatically reduce the charging current and control The charging capacity of the battery should not exceed the range of the capacity that can be accommodated in the battery until the battery is fully charged.

A qualified fast charging chip must be able to automatically control the charging process to seamlessly switch between the above three stages according to the level of the battery voltage, without the help of other hardware or software. However, in this application, more than one fast charging chip is used. In this application, two charging modules are used to charge the battery. During the charging process, although the two charging modules can automatically control the charging to complete the above three stages Seamless switching is performed to complete the charging process, but the two charging modules are charged in parallel. In order to reasonably regulate the charging work of the two charging modules, this application proposes a fast charging method, which is mainly aimed at when the battery is charged to a constant voltage. During the phase, when the charging chip automatically reduces the charging current, the charging currents of the two charging modules are adjusted to avoid the charging currents of the two charging modules from being reduced too fast and making the charging modules easy to wear.

Specifically, when the control module detects the input current of the USB interface, the control module thinks that the first charging module and the second charging module start to charge the battery, and the control module obtains the charging current value of the first charging module in real time. It should be noted that Since the constant voltage value set by the first charging module is smaller than the constant voltage value of the second charging module, when the battery is charged into the constant voltage charging stage, the first charging module approaches the charging cut-off voltage earlier than the second charging module. Therefore, the first charging module automatically reduces the charging current before the second charging module, so the control module first obtains the charging current of the first charging module. Of course, if the constant voltage value set by the first charging module is greater than the constant voltage value of the second charging module Then, the second charging module automatically reduces the charging current before the first charging module, and the control module first obtains the charging current of the second charging module.

The control module adjusts the charging current value of the second charging module according to the obtained charging current value of the first charging module. Because in the constant voltage charging stage, at a charging node, the first charging module and the second charging module are at a constant Regarding voltage and constant current, if the current of one of the charging modules decreases sharply, the other charging module will inevitably need to increase the output current value to meet the charging power of the current stage of the battery. While the charging current value of the first charging module decreases, The charging current value of the second charging module can be adjusted according to the charging current value of the first charging module, so that the charging currents of the two charging modules can be reduced slowly and uniformly at the same time, so as to increase the service life of the battery and the two charging modules. It is convenient to control the charging status of the battery, making the battery charging work more intelligent.

Further, referring to FIG. 4, a second embodiment of the present application is proposed based on the first embodiment. In this embodiment, the step of adjusting the charging current value of the second charging module according to the charging current value of the first charging module include:

Step S2100, judging whether the charging current value of the first charging module is less than a first preset current value;

Step S2200: If the charging current value of the first charging module is less than the first preset current value, adjust the charging current value of the second charging module.

The first preset current value can be set manually, where the first preset current value is between greater than the charging cut-off current value and less than the charging maximum current value. The specific value can be set according to user requirements. In this embodiment, Preferably, the first preset current value is 0.5 mA.

Specifically, the control module transmits the control signal to the charge control chip of the second charging module, and the charge control chip of the second charging module adjusts the output current or disconnects the charger according to the control signal of the control module, so that the second The current output by the charging control chip of the charging module decreases, or the charging control chip of the second charging module is turned off to stop working.

In this embodiment, in order to prevent the charging current value of the first charging module from directly dropping to the minimum charging cut-off current, and the charging current value of the second charging module is still in a high state, in order to facilitate the regulation module to charge the first The current output is adjusted reasonably between the module and the second charging module. Before the charging current value of the first charging module drops to the minimum charging cut-off current value, the control module determines whether the charging current value of the first charging module obtained is less than the first charging current value. The preset current value, if the charging current value of the first charging module has not reached the first preset current value, the control module determines that the first charging module is still in a normal working state, and if the charging current value of the first charging module reaches the first When the current value is preset, the control module considers that the charging current value of the first charging module is about to reach the minimum charging cut-off current, then the control module starts to adjust the charging current value of the second charging module so that the charging current value of the second charging module follows The step of decreasing the charging current value of the first charging module is carried out to protect the service life of the charging element.

Further, referring to FIG. 5, a third embodiment of the present application is proposed based on the above-mentioned embodiment. In this embodiment, if the charging current value of the first charging module is less than the first preset current value, adjust the The steps of the charging current value of the second charging module include:

Step S2210, if the charging current value of the first charging module is less than the first preset current value, obtain the charging current value of the second charging module;

Step S2220, determining whether the charging current value of the second charging module is greater than or equal to a second preset current value, where the second preset current value is less than the first preset current value;

Step S2200: If the charging current value of the second charging module is greater than or equal to the second preset current value, adjust the charging current value of the second charging module.

When the battery voltage is charged to close to the charging cut-off voltage, the charging chip must be able to automatically reduce the charging current, and control the battery's charging capacity not to exceed the battery's capacity range until the battery is fully charged, which maintains the battery The charging current in the fully charged state is the minimum charging cut-off current. In this embodiment, the minimum charging cut-off current is set to the second preset current value, which can be set according to the battery performance. In this embodiment, preferably, the first 2. The preset current value is 0.25mA.

When the charging current value of the first charging module has reached the critical first preset current value, the control module starts to adjust the charging current value of the second charging module so that the charging current value of the second charging module keeps up with the first charging The step of decreasing the charging current value of the module, the specific steps of adjusting the charging current value of the second charging module include:

The control module obtains the charging current value of the second charging module, and then compares the obtained charging current value of the second charging module with the second preset current value. If the charging current value of the second charging module is still greater than or equal to the second When the current value is preset, the control module determines that the second charging module is still in a high-current charging state. In order to protect the battery performance, the control module adjusts the charging current value of the second charging module.

In this embodiment, the adjustment module starts to adjust the charging current value of the second charging module, so that the charging current value of the second charging module keeps up with the decreasing step of the charging current value of the first charging module, so as to protect the service life of the charging element. .

Further, referring to FIG. 6, a fourth embodiment of the present application is proposed based on the above-mentioned embodiment. In this embodiment, if the charging current value of the second charging module is greater than or equal to the second preset current value, The step of adjusting the charging current value of the second charging module includes:

Step S2230, if the charging current value of the second charging module is greater than or equal to the second preset current value, obtain a preset drop value;

Step S2240: Adjust the charging current value of the second charging module to decrease by the preset decrease value.

The preset drop value is the value difference between the adjustment module's adjustment of the charging current value of the second charging module. When the adjustment module adjusts the charging current value of the second charging module, the charging current value of the second charging module is decreased by the preset drop value to The charging current value of the second charging module is adjusted, wherein the preset drop value is less than the constant current value of the second charging module. The specific preset drop value can be set according to user requirements. In this embodiment, preferably, The vertical of the preset drop value is 0.25mA.

Since in the constant voltage charging stage, at a charging node, the first charging module and the second charging module are in a constant voltage and constant current relationship. If the current of the second charging module drops sharply, then the first charging module is bound to require Increase the output current value to meet the current charging power of the battery.

In this embodiment, by adjusting the charging current value of the second charging module, the charging current value of the second charging module decreases by a preset decrease value, the charging current value of the first charging module increases, and the charging current value of the first charging module is equal to The charging current value of the second charging module keeps dropping at a constant speed to increase the service life of the battery and the two charging modules, and it is also convenient to control the charging state of the battery, making the battery charging work more intelligent.

Further, referring to FIG. 7, a fifth embodiment of the present application is proposed based on the above-mentioned embodiment. In this embodiment, the step of determining the magnitude of the charging current value of the second charging module and the preset cut-off current value is followed by include:

In step S2250, if the charging current value of the second charging module is less than the second preset current value, the charging current value output by the second charging module is the charging current value required to supply the battery in a saturated charging state, or the battery demand If the current value of is very small, the control module controls the charging control chip of the second charging module to disconnect from the charger, and the control module stops the charging work of the second charging module to avoid battery overcharge and damage to the battery.

Further, after the step of stopping the charging work of the second charging module, the method further includes:

Step S2260, judging the magnitude of the charging current value of the first charging module and the second preset current value;

In step S2270, if the charging current value of the first charging module is less than the second preset current value, control the charging circuit of the second charging module to turn off.

The charging current value of the second charging module is less than the second preset current value, indicating that the charging current value output by the second charging module is the charging current value required to supply the battery in a saturated state of charge, then the control module needs to control the charging of the battery If the circuit cannot exceed the power range that can be contained in the battery, the first charging module needs to be automatically reduced to the second preset current value to avoid battery over-saturation and damage to the battery, so that the first charging module can be shut down immediately. To protect the performance of the charging module.

The control module compares the charging current value of the first charging module with the second preset current value. If the charging current value of the first charging module is less than the second preset current value, it is considered that the first charging module can be turned off, then the control The module sends a control signal to stop charging, and when the first charging module receives the control signal, the first charging module disconnects from the charger.

In this embodiment, the current value of the second charging module and the charging current value of the first charging module are respectively compared with the second preset current value, so that the control module can understand the charging state of the battery in real time, and immediately turn off the first charging module With the second charging module, the performance of the charging module can be protected.

It should be noted that in this article, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, It also includes other elements not explicitly listed, or elements inherent to the process, method, article, or device. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, article, or device that includes the element.

The serial numbers of the foregoing embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above implementation manners, those skilled in the art can clearly understand that the above-mentioned embodiment method can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is better.的实施方式。 Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The optical disc) includes a number of instructions to enable a terminal device (which can be a mobile phone, a computer, a cloud server, an air conditioner, or a network device, etc.) to execute the methods of the various embodiments of the present application.

The above are only the preferred embodiments of the application, and do not limit the scope of the patent for this application. Any equivalent structure or equivalent process transformation made using the content of the description and drawings of the application, or directly or indirectly applied to other related technical fields , The same reason is included in the scope of patent protection of this application.

Claims

A charging system for handheld devices includes a charger and a terminal device. The charger is connected to a USB interface of the terminal device. The terminal device includes a first charging module and a second charging module, a control module, and a USB interface. Interface and battery module, the control terminal of the first charging module and the control terminal of the second charging module are both connected to the control module, and the USB interface is respectively connected to the input terminal of the first charging module and the The control module is connected, the first charging module includes an intermediate output end and an output end, the input end of the second charging module is connected to the intermediate output end of the first charging module, and the input end of the battery module is connected to the intermediate output end of the first charging module. The output terminal of the first charging module, the output terminal of the second charging module, and the control module are connected.
The charging system for handheld devices according to claim 1, wherein the first charging module includes a shunt switch, the input end of the shunt switch is connected to the USB interface, and the output end of the shunt switch includes a middle The output terminal is connected to the internal output terminal, the intermediate output terminal of the shunt switch is connected with the input terminal of the second charging module, and the internal output terminal of the shunt switch is connected with the charging control circuit of the first charging module.
A terminal device, wherein the terminal device includes:

Battery module

USB interface, used to connect the charger;

A first charging module and a second charging module. The first charging module includes an intermediate output terminal and an output terminal. The intermediate output terminal of the first charging module is connected to the input terminal of the second charging module. The input terminal of the charging module is connected with the output terminal of the USB interface, and the output terminal of the first charging module and the output terminal of the second charging module are both connected with the input terminal of the battery module.
The terminal device of claim 3, wherein the terminal device further comprises a control module, the control module is respectively connected with the first charging module and the second charging module, while the control module D+ lead The pin, D-pin and ID pin are connected to the power interface module, and the control module controls the operation of the first charging module and the second charging module.
The terminal device of claim 3, wherein the voltage of the first charging module is lower than the voltage of the second charging module.
A fast charging method applied to a handheld device, wherein the handheld device includes a battery module, a USB interface, a first charging module, a second charging module, and a control module, wherein the fast charging method includes:

Acquiring the charging current value of the first charging module after detecting that a fast charging charger is inserted into the USB interface;

The charging current value of the second charging module is adjusted according to the charging current value of the first charging module.
7. The fast charging method of claim 6, wherein the step of adjusting the charging current value of the second charging module according to the charging current value of the first charging module comprises:

Judging whether the charging current value of the first charging module is less than a first preset current value;

If the charging current value of the first charging module is less than the first preset current value, adjusting the charging current value of the second charging module.
7. The method of fast charging according to claim 7, wherein the step of adjusting the charging current value of the second charging module if the charging current value of the first charging module is less than the first preset current value include:

If the charging current value of the first charging module is less than the first preset current value, acquiring the charging current value of the second charging module;

Determining whether the charging current value of the second charging module is greater than or equal to a second preset current value, wherein the second preset current value is less than the first preset current value;

If the charging current value of the second charging module is greater than or equal to the second preset current value, adjusting the charging current value of the second charging module.
The method of fast charging according to claim 8, wherein if the charging current value of the second charging module is greater than or equal to the second preset current value, the charging current value of the second charging module is adjusted The steps include:

If the charging current value of the second charging module is greater than or equal to the second preset current value, obtaining a preset drop value;

Adjusting the charging current value of the second charging module to decrease the preset decreasing value.
8. The fast charging method according to claim 8, wherein after the step of determining the magnitude of the charging current value of the second charging module and the preset cut-off current value, the method further comprises:

If the charging current value of the second charging module is less than the second preset current value, controlling the charging circuit of the second charging module to turn off.
The method of fast charging according to claim 10, wherein after the step of controlling the charging circuit of the second charging module to be disconnected, the method further comprises: To

Judging the magnitude of the charging current value of the first charging module and the second preset current value;

If the charging current value of the first charging module is less than the second preset current value, controlling the charging circuit of the first charging module to be turned off.