CN107204636A - Charging method for detecting battery voltage to adjust power supply current in charging process - Google Patents

Abstract

The present invention provides a charging method for detecting battery voltage during charging and adjusting supply current accordingly. The method is applied to a mobile terminal device and a power supply device. When the mobile terminal device and the power supply device are fast charged, the power supply device will interrupt charging after each charging period, and the charging will continue for an interruption period. During the interruption period, the power supply device will detect the voltage value of the rechargeable battery in the mobile terminal device, and adjust the current value of subsequent charging according to the voltage value until the voltage saturation of the rechargeable battery is detected. In this way, during the fast charging process, the power supply device can effectively control the sudden temperature rise of the rechargeable battery during the charging process through these interruption periods, and the power supply device can also adjust the appropriate charging current according to the current voltage of the rechargeable battery.

Description

A charging method that detects battery voltage during charging to adjust supply current

technical field

The present invention relates to a charging method, especially a power supply device that stops power supply for a predetermined time during the charging process of a mobile terminal device, and detects the current voltage of the rechargeable battery of the mobile terminal device within the aforementioned time to adjust the subsequent power supply current charging method.

Background technique

In recent years, with the vigorous development of electronic and communication technologies, mobile terminal devices (such as: mobile phones (mobile phones) and smart phones (smart phones)... etc.) have almost become an indispensable important device for most urbanites. One mobile phone per person has also become a common phenomenon that can be seen everywhere in urban areas. Therefore, under the situation that people are more and more dependent on mobile terminal devices, the "endurance" of mobile terminal devices (that is, the ability to continue to operate without charging) time) seems to be the focus of people.

Continuing from the above, there are many reasons that affect the "endurance" of mobile terminal devices, but the main factors include: first, power-consuming electronic components, such as: larger and larger mobile phone screens, more powerful system chips (System on Chip, referred to as SoC); the second is faster wireless network technology, for example: 4G technology consumes far more power than 3G technology; the third is more additional functions and background programs, such as: Bluetooth (Bluetooth) search, GPS positioning, real-time communication software (such as: LINE)... etc., causing the power-saving technology of the industry to catch up with the pace of power consumption, resulting in the power provided by the batteries of many mobile terminal devices, which is not enough for the use of mobile terminal devices for one day. Therefore, in order to avoid mobile Due to the dilemma that the terminal device cannot be used due to insufficient power, when people go out, they usually carry a mobile power supply to charge the mobile terminal device and maintain the "endurance" of the mobile terminal device.

For the description of the charging technology between the existing mobile terminal device and the power supply device (such as: mobile power supply), please refer to Figure 1. In order to avoid the drawing being too complicated, only some components of the mobile terminal device are shown in Figure 1 , and the mobile terminal device 1 includes the rechargeable battery 11, a general charging circuit 13 and a transmission port 15, wherein the rechargeable battery 11 is electrically connected to the general charging circuit 13, and the general charging circuit 13 can be connected to the transmission port 15. The interface 15 is electrically connected so that the transmission interface 15 can receive the current from a power supply device 19 and transmit it to the rechargeable battery 11. Moreover, the general charging circuit 13 is provided with a battery charging chip 130 (Battery Charger IC), The battery charging chip 130 can mainly provide the correct charging current and charging voltage required by the rechargeable battery 11, that is, the battery charging chip 130 will measure the charging current and voltage of the rechargeable battery 11, so that the charging current and voltage can be kept at within the predetermined range of the operator.

In addition, in order to shorten the charging time of the rechargeable battery of the mobile terminal device, many companies have designed various "fast charging technologies". Within the range that can be loaded, a large current is given to achieve the effect of saturating the rechargeable battery in a short time. However, the applicant found that, referring to Figure 1 again, in the existing charging method, the current provided by the power supply device , the current needs to pass through the battery charging chip 130 to transmit the current to the rechargeable battery 11, resulting in poor charging efficiency, and the effect of the "fast charging technology" expected by the industry cannot be exerted; in addition, the existing "fast charging technology" in In application, the following problems will still be faced:

(1) When the rechargeable battery 11 receives current, in addition to converting electrical energy into chemical energy, part of the electrical energy in the electrolyte inside the rechargeable battery 11 will be converted into heat and dissipated, causing the temperature of the rechargeable battery 11 to rise. Therefore, when When the current is larger, the rechargeable battery 11 will generate more heat, thereby shortening the service life of the rechargeable battery 11; and

(2) When the voltage of the rechargeable battery 11 approaches saturation, if the rechargeable battery 11 is continuously received with a large current, the rechargeable battery 11 will be damaged, making the rechargeable battery 11 unusable, or shortening its service life.

To sum up, it can be seen that the existing charging related technologies cannot really meet the needs of users, and may even cause adverse effects on rechargeable batteries. Therefore, how to effectively solve the aforementioned problems has become an important subject that the present invention is eager to achieve here. .

Contents of the invention

In view of the existing mobile terminal device and the power supply device, there are still some gaps when charging, therefore, the inventor has finally designed this Invented a charging method that detects the battery voltage during the charging process and adjusts the supply current accordingly, so as to provide users with a better charging experience.

An object of the present invention is to provide a charging method that detects the battery voltage during charging and adjusts the supply current accordingly, which is applied to a mobile terminal device and a power supply device, wherein the power supply device is provided with a charging port, and Built-in a charging comparison table, the charging comparison table includes a plurality of voltage values and corresponding charging current values, the mobile terminal device has a fast charging mode and a normal charging mode, and it is provided with a transmission interface and a rechargeable battery, the transmission The interface is electrically connected to the charging interface to receive the current from the charging interface. When the mobile terminal device is in the state of the fast charging mode, it will quickly charge the rechargeable battery. When the mobile terminal device is in the state of the fast charging mode In the state of normal charging mode, it will generally charge the rechargeable battery, and the charging speed of the fast charging is higher than the charging speed of the normal charging, when the power supply device is electrically connected to the mobile terminal device, and the mobile terminal device When in the fast charging mode, the power supply device will transmit a first charging current value to the rechargeable battery, and after continuing for a charging period, stop transmitting the first charging current value, and continue for an interruption period, after the interruption During this period, the power supply device will detect a current voltage value of a power supply pin of the charging port, wherein the power supply pin is electrically connected to a power supply pin of the transmission interface, and the voltage value of the power supply pin is equal to the The voltage value of the power pin, the voltage value of the power pin is equal to the voltage value of the rechargeable battery, thus, the power supply device will read a corresponding second charging current from the charging comparison table according to the current voltage value value, and after the interruption period ends, the second charging current value is transmitted to the rechargeable battery through the charging interface and the transmission interface in sequence, and the charging period and the interruption period are continued in sequence, and then, repeat The steps of detecting the voltage value, adjusting and outputting the corresponding charging current value up to the charging period, interrupting the transmission of the corresponding charging current value up to the interrupting period, etc., until the voltage saturation of the rechargeable battery is detected. During the fast charging process, there will be multiple interruption periods, so the temperature of the rechargeable battery can be effectively prevented from rising suddenly during the charging process, and an appropriate charging current can be adjusted according to the current voltage of the rechargeable battery.

Description of drawings

FIG. 1 is a schematic structural diagram of a charging circuit of a mobile device and a power supply device in the prior art;

2 is a schematic structural diagram of the charging circuit of the mobile device and the power supply device of the present invention; and

Fig. 3 is a flow chart of the present invention.

Explanation of reference signs

【current technology】

Mobile terminal device 1

rechargeable battery 11

General charging circuit 13

Battery charging chip 130

Transmission interface 15

power supply unit 19

【this invention】

Mobile terminal device 2

Transmission interface 21

Power pin 211

rechargeable battery 22

General charging circuit 23

Fast charging circuit 24

Fast charge switching chip 25

power supply unit 3

charging port 31

Power pin 311

control unit 32

storage unit 33

Charging Comparison Table 331

power unit 34

Steps 401-408

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The present invention provides a charging method that detects the battery voltage during charging and adjusts the supply current accordingly. Please refer to FIG. 2, the charging method is applied to a mobile terminal device 2 and a power supply device 3, and the mobile The terminal device 2 can be a smart phone, a tablet computer, etc., and the power supply device 3 can be a mobile power supply, a charging adapter (Adapter)..., etc. In one embodiment, the mobile terminal device 2 includes a transmission port 21, a Rechargeable battery 22, general charging circuit 23, a fast charging circuit 24 and a fast charging switching chip 25, wherein, the transmission interface 21 can be various types of connectors such as USB, Micro USB, Lightning, etc., and can be connected with the power supply A charging port 31 of the device 3 is electrically connected to receive the voltage, current and signal transmitted from the power supply device 3. In other embodiments of the present invention, the transmission interface 21 and the charging interface 31 can be directly connected to each other. Inserting, or connecting through a transmission line, the combination is first stated.

In addition, please refer to FIG. 2 again, the general charging circuit 23 is electrically connected to the rechargeable battery 22, and can perform general charging on the rechargeable battery 22 in a general charging mode, wherein the general charging circuit 23 includes a battery charging chip, and its circuit structure can be shown as the general charging circuit 13 of Fig. , referred to as CC)/constant voltage (Constant Voltage, referred to as CV) mode, the received current is transmitted to the rechargeable battery 22; moreover, please refer to Figure 2, the fast charging circuit 24 and the rechargeable battery 22 The rechargeable battery 22 can be charged quickly in a fast charging mode. The charging speed of the fast charging is higher than the charging speed of the normal charging. It is particularly mentioned here that in the foregoing embodiments, the present invention does not It is not limited to the circuit structure of the fast charging circuit 24 and the general charging circuit 23, as long as it meets the aforementioned technical characteristics and makes the charging speed of the fast charging faster than the charging speed of the normal charging, it is the fast charging circuit 24 of the present invention. With general charging circuit 23, close first Chen Ming.

Please refer to Fig. 2 again, the fast charging switching chip 25 is electrically connected with the transmission port 21, the fast charging circuit 24 and the general charging circuit 23 respectively, so as to be able to receive the current transmitted from the transmission interface 21, wherein the fast charging The charge switch chip 25 has a fast charge state and a general charge state. When it switches to the fast charge state (that is, 25A and 25B in FIG. 2 are electrically connected, but 25A and 25C are disconnected), the fast charge switch chip 25 The current from the transmission port 21 will be transmitted to the fast charging circuit 24, so as to quickly charge the rechargeable battery 22 through the fast charging circuit 24, and the voltage value on a power pin 211 of the transmission interface 21, It will be equal to the voltage value of the rechargeable battery 22; in addition, when the fast charging switching chip 25 is switched to a normal charging state (that is, 25A and 25C in FIG. 2 will be electrically connected, but 25A and 25B will be disconnected), it will The current transmitted from the transmission interface 21 is transmitted to the general charging circuit 23 , so that the rechargeable battery 22 is generally charged through the general charging circuit 23 .

Furthermore, as shown in FIG. 2 , the power supply device 3 includes the charging port 31 , a control unit 32 , a storage unit 33 and a power unit 34 , wherein the charging port 31 has at least one power supply pin 311 , And when the charging interface 31 is electrically connected to the transmission interface 21, the voltage value of the power supply pin 311 will be equal to the voltage value of the power supply pin 211, and the control unit 32 is respectively connected to the charging port 31, The storage unit 33 and the power unit 34 are electrically connected to be able to access the data in the storage unit 33, and control the power unit 34 to output current to the charging port 31, and receive data from the charging port 31. In particular, in FIG. 2 , although the power unit 34 is drawn as being electrically connected to the charging port 31, in other embodiments of the present invention, the power unit 34 may not be connected to the charging port. 31-phase electrical connection, but the current is transmitted through the control unit 32. Therefore, in the subsequent embodiments or the patent application scope of the present invention, the scope of "the value of the current transmitted by the control unit 32" should include "the control unit 32 The implementation aspects of controlling the power unit 34 to directly transmit current to the charging interface 31" and "the control unit 32 receiving the current from the power unit 34 and forwarding it to the charging interface 31" will be described first.

Referring again to FIG. 2, the storage unit 33 stores a charging comparison table 331, the charging comparison table 331 includes a plurality of voltage values and corresponding charging current values, and the power unit 34 can supply a charging current to the charging interface 31. When the power supply device 3 intends to perform "fast charging technology" on the mobile terminal device 2, the fast charging switching chip 25 will switch to the fast charging mode, so that the power supply device 3 can charge the mobile terminal device 2 through the fast charging circuit 24 The battery 22 is charged, and in the foregoing case, the control unit 32 will transmit a first charging current value (such as: 2.1 amperes) to the rechargeable battery 22, and during a continuous charging period (such as: 100 milliseconds (ms) )), the control unit 32 will interrupt the transmission of the first current value and continue for an interruption period (eg: 100 milliseconds (ms)), at this time, during the interruption period, the control unit 32 will detect the charging interface A current voltage value of the power supply pin 311 of 31, and then the current voltage value of the rechargeable battery 22 can be known, thus, the control unit 32 will read a corresponding one from the charging comparison table 331 according to the current voltage value. second charging current value, and after the interruption period ends, transmit the second charging current value (such as: 2 amps) to the rechargeable battery 22, and continue the charging period (such as: 100 milliseconds (ms)), after that , the control unit 32 will interrupt the transmission of the second current value again, and continue the interruption period (for example: 100 milliseconds (ms)), and also during the interruption period, detect the current voltage value of the power supply pin 311, and Accordingly, the charging current output by the power unit 34 is adjusted until the voltage of the rechargeable battery 22 is saturated; here, when the rechargeable battery 22 no longer receives current, its voltage value will change to its own voltage value, therefore, the control unit 32 can judge whether the voltage of the rechargeable battery 22 is saturated or is approaching saturation according to the current voltage value of the power supply pin 311, so as to adjust the size of the charging current, so that It can ensure that the rechargeable battery 22 will not be damaged due to continuous transmission of large current.

In order to clarify the charging method of the present invention, only the processing flow of the control unit 32 of the present invention will be described below, as shown in FIGS. 2 and 3 :

(401) The control unit 32 transmits a charging current value to the rechargeable battery 22, and enters step (402);

(402) The control unit 32 judges whether the charging current value reaches a charging period, if so, enter step (403), otherwise, return to step (402);

(403) The control unit 32 interrupts the transmission of the charging current value, and enters step (404);

(404) The control unit 32 detects a current voltage value of the power supply pin 311 of the charging port 31, and enters step (405);

(405) The control unit 32 reads the charging comparison table 331, and enters step (406);

(406) The control unit 32 obtains the corresponding charging current value from the charging comparison table 331 according to the current voltage value, and enters step (407);

(407) The control unit 32 judges whether the power supply has been stopped during an interruption, if so, enter step (408), otherwise, return to step (407);

(408) The control unit 32 transmits the corresponding charging current value to the rechargeable battery 22, and enters step (402).

In this way, as shown in Figure 2 again, through the overall charging method of the present invention, the following effects can be achieved:

(A) Since the power supply device 3 and the mobile terminal device 2 have multiple interruption periods during the fast charging process, the temperature of the rechargeable battery 22 can be effectively controlled to rise sharply during the charging process. At the same time, when the rechargeable battery 22 During the electrochemical reaction of the electrolyte in the electrolyte, the rechargeable battery 22 can be rested during these interruptions, so that in the internal electrolyte, the part with high concentration can flow to the part with low concentration, and then the rechargeable battery 22 The concentration of the internal electrolyte is uniform, so as to improve the charging efficiency of the rechargeable battery 22;

(B) The power supply device 3 can adjust the appropriate charging current according to the current voltage of the rechargeable battery 22, that is, when the rechargeable battery 22 approaches the saturation voltage, the power supply device 3 will provide a smaller current to the rechargeable battery 22. Mobile terminal device 2; on the contrary, when the rechargeable battery 22 is not close to the saturation voltage, the power supply device 3 will provide a larger current to the mobile terminal device 2; in this way, not only can effectively shorten the charging time, but also avoid harmful charging battery 22; and

(C) Since the process of detecting and adjusting the current of the present invention is completed by the control unit 32 of the power supply device 3, the operational burden of the mobile terminal device 2 can be effectively reduced, and at the same time, the mobile terminal device 2 does not need to run the aforementioned process , can also reduce the heat generated when the mobile terminal device 2 is in operation.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. A charging method that detects the battery voltage during charging and adjusts the power supply current accordingly, applied to a mobile terminal device and a power supply device, characterized in that the power supply device is provided with a charging port and has a built-in charging port The comparison table, the charging comparison table includes a plurality of voltage values and corresponding charging current values, the mobile terminal device has a fast charging mode and a general charging mode, and it is provided with a transmission interface and a rechargeable battery, the transmission interface and the charging The interface is electrically connected to receive the current from the charging interface. When the mobile terminal device is in the state of the fast charging mode, it will quickly charge the rechargeable battery. When the mobile terminal device is in the state of the general charging mode In this state, it will generally charge the rechargeable battery, and the charging speed of the fast charging is higher than the charging speed of the normal charging. When the power supply device is electrically connected to the mobile terminal device, and the mobile terminal device is in the fast charging mode, the power supply unit will perform the following steps: sequentially transmitting a first charging current value to the rechargeable battery through the charging interface and the transmission interface, and after continuing for a charging period, interrupting the transmission of the first charging current value and continuing for an interrupting period; During the interruption period, a current voltage value of a power supply pin of the charging interface is detected, wherein the power supply pin is electrically connected to a power supply pin of the transmission interface, and the voltage value of the power supply pin is equal to the power supply pin The voltage value of the pin, the voltage value of the power pin is equal to the voltage value of the rechargeable battery; Reading a corresponding second charging current value from the charging comparison table according to the current voltage value; After the interruption period ends, transmitting the second charging current value to the rechargeable battery through the charging interface and the transmission interface in sequence, and continuing the charging period and the interruption period in sequence; and Repeat the aforementioned steps of detecting the voltage value, adjusting and outputting the corresponding charging current value for the charging period, and interrupting the transmission of the corresponding charging current value for the interrupting period until the voltage saturation of the rechargeable battery is detected. 2. The charging method according to claim 1, wherein the mobile terminal device further comprises a fast charging circuit, a normal charging circuit and a fast charging switching chip, wherein the normal charging circuit and the fast charging circuit are respectively connected to The rechargeable battery is electrically connected, and the fast charging switching chip is electrically connected to the transmission port and the fast charging circuit or the general charging circuit respectively. When the mobile terminal device is in the fast charging mode, the fast charging switching chip The chip will switch and fast charge the rechargeable battery through the fast charging circuit. 3. The charging method according to claim 2, characterized in that, when the mobile terminal device is in the fast charging mode, the fast charging switching chip will switch and perform normal charging on the rechargeable battery through the normal charging circuit. Charge. 4. The charging method according to claim 1, 2 or 3, wherein the power supply device further comprises a control unit, a storage unit and a power unit, wherein the control unit is connected to the charging port and the storage unit respectively. unit and the power unit are electrically connected, the storage unit stores the charging comparison table, and the control unit enables the power unit to directly supply the first charging current value or the corresponding charging current value to the charging interface, or through The first charging current value or the corresponding charging current value is indirectly supplied to the charging interface by itself.