WO2020052375A1 - Charging control method and apparatus, and terminal device - Google Patents

Abstract

A charging control method and apparatus, and a terminal device. The method comprises: generating an alternating current electromagnetic induction signal, and converting the alternating current electromagnetic induction signal into a direct current signal, the current corresponding to the direct current signal being used for charging a battery (401); and obtaining a first control signal during a data packet transmission interval, and controlling the current increase of the direct current signal on the basis of the first control signal (402).

Description

Charging control method and device, and terminal equipment Technical field

The present application relates to wireless charging technology, and in particular, to a charging control method and device, and terminal equipment.

Background technique

In order to accelerate the development of wireless charging technology, the Wireless Charging Consortium (WPC, Wireless Power Consortium) has formulated a new medium-power wireless charging standard that can support large charging power and charging current.

For medium power wireless charging, in order to support fast charging, the charging current will be increased. However, if the charging current is large, the voltage drop will occur. On the other hand, the rapid adjustment of the charging current will also cause the voltage drop. How to solve the problem of voltage drop of wireless charging when outputting a large current, and the voltage drop during the dynamic and rapid adjustment of the charging current, so as to enable wireless charging to perform large current charging and achieve true fast charging, are the current research issues of terminals.

Summary of the Invention

In order to solve the above technical problems, embodiments of the present application provide a charging control method and device, and a terminal device.

The charging control method provided in the embodiment of the present application includes:

Generating an AC electromagnetic induction signal, converting the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery;

A first control signal is obtained during a data packet transmission interval, and the current of the DC signal is controlled to increase based on the first control signal.

The charging control device provided in the embodiments of the present application includes:

An electromagnetic induction unit configured to generate an AC electromagnetic induction signal;

An AC / DC conversion unit configured to convert the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery;

The current control unit is configured to obtain a first control signal during a data packet transmission interval, and control the current of the DC signal to increase based on the first control signal.

The terminal device provided in the embodiment of the present application includes the above-mentioned charging control device and battery; wherein, the charging control device is configured to generate an AC electromagnetic induction signal, convert the AC electromagnetic induction signal into a DC signal, and the DC signal is used for Charging the battery; iteratively performing the following operations until the current of the DC signal reaches a current threshold: obtaining a first control signal, and controlling the current of the DC signal to increase based on the first control signal.

In an embodiment of the present disclosure, a storage medium is also provided, and the storage medium may store an execution instruction, which is used to implement an implementation of the charging control method in the foregoing embodiment.

The technical solution of the embodiment of the present application generates an AC electromagnetic induction signal, converts the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery; and a first control signal is obtained during a data packet transmission interval, The current of the DC signal is controlled to increase based on the first control signal. With the technical solution of the embodiment of the present application, the charging current during the wireless charging is slowly increased, which avoids the problem of voltage drop during the charging current increase and during the dynamic and rapid adjustment of the current. Further, wireless charging can be performed normally and stably. Current charging for true fast charging.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 (a) is a schematic diagram of charging cut-off;

Figure 1 (b) is a schematic diagram of charging current limit;

FIG. 2 is a schematic diagram of a wireless charging system crash and cut-off charging; FIG.

3 is a schematic diagram of a voltage waveform of a dynamic response voltage VRECT;

FIG. 4 is a first schematic flowchart of a charging control method according to an embodiment of the present application; FIG.

FIG. 5 is a principle block diagram of Solution 1 provided by an embodiment of the present application; FIG.

6 is a schematic block diagram of a decoding module according to an embodiment of the present application;

FIG. 7 (a) is a first schematic diagram of an increase in load current provided by an embodiment of the present application; FIG.

FIG. 7 (b) is a second schematic diagram of an increase in load current provided by an embodiment of the present application; FIG.

FIG. 8 is a principle block diagram of the second solution according to an embodiment of the present application; FIG.

FIG. 9 (a) is a third schematic diagram of an increase in load current provided by an embodiment of the present application; FIG.

FIG. 9 (b) is a fourth schematic diagram of an increase in load current provided by an embodiment of the present application;

FIG. 10 is a principle block diagram of the third solution according to an embodiment of the present application; FIG.

11 is a second schematic flowchart of a charging control method according to an embodiment of the present application;

FIG. 12 is a third flowchart of a charging control method according to an embodiment of the present application;

FIG. 13 is a fourth flowchart of a charging control method according to an embodiment of the present application;

14 is a schematic structural composition diagram of a charging control device according to an embodiment of the present application;

FIG. 15 is a schematic structural composition diagram of a terminal device according to an embodiment of the present application.

detailed description

As a consumer electronics accessory, wireless charging devices have successfully won the favor of consumers. However, a large number of wireless charging devices on the market have not yet reached the expected charging effect. One of the main reasons for this situation is wireless charging efficiency. Low, slow charging. As of now, the main certification bodies of wireless charging can only perform certifications below 5W, and in order to be able to pass the certification and ensure the stability of charging, all interrupt manufacturers often set the charging current to be very low, generally only a few hundred milliamps. . But for most terminal products, with the increase of battery capacity, the charging current of several hundred milliamps can not meet the needs of users at all. For a 3000mAH battery, it takes 5 hours to fully charge it once, which seriously affects the user experience.

In order to solve this problem and accelerate the development of wireless charging, WPC has formulated a new medium-power wireless charging standard, which supports a maximum of 15W charging, and the output current (that is, the charging current) supports a maximum of 3A.

According to the research on the current low-power (less than 5W) wireless charging schemes, when the output current of wireless charging is large, the current changes easily cause voltage drop, or it is also very easy to cause when the output current of wireless charging is dynamically and rapidly adjusted. The voltage drop causes the charging current to be prematurely limited to a lower level. Further, triggering Auto Input Current Limit (AICL) or Under Voltage Lock Out (UVLO for short) and the like are triggered. The final result leads to problems such as foreign object detection (FOD) in the QI certification test, failing the compatibility test, slow charging, and charging termination. As shown in Figure 1 (a), when the load current (that is, the charging current) increases, the output voltage drops significantly for 20ms, triggering UVLO, which results in the termination of charging. Figure 1 (b) triggers AICL, which limits the charging current. To a lower level, only 500mA. And it can be seen from the figure that within 20ms, the voltage drops to about 3.8V. It is found through experiments that the larger the sudden change in the charging current, the larger the voltage drop.

In addition, although wireless charging can achieve higher power and higher voltage output, it has the following problems: 1. Poor dynamic response. When the back-end load changes greatly, voltage drop is very easy to occur, and the back-end If the load is adjusted too quickly, the wireless charging system will collapse and lead to cut-off charging, as shown in Figure 2, where the upper line is the wireless charging output voltage waveform and the lower line is the wireless charging output current waveform. To ensure the stability of communication, wireless charging will limit the output voltage, especially at high loads. When the load current changes by several tens of milliamps, it will affect the output voltage. When the load is large, a voltage drop occurs. 2. The wireless charging data packet transmission adopts the carrier communication method, that is, on the generated AC electromagnetic induction signal, different data is represented by different amplitudes. After rectification, these data are synchronously loaded on VRECT. VRECT is the rectified voltage, such as Shown in Figure 3. If a large charging current fluctuation occurs during the data communication phase, a voltage drop is very likely to occur. This is also a common problem of wireless charging. In order to maintain communication stability, it can only be solved by limiting the output voltage. Because if the packet transmission is interrupted, wireless charging will stop immediately.

For this reason, the following technical solutions of the embodiments of the present application are proposed to enable wireless charging to normally and stably perform high-current charging, thereby achieving true fast charging.

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

FIG. 4 is a schematic flowchart of a charging control method according to an embodiment of the present application. As shown in FIG. 4, the charging control method includes the following steps:

Step 401: Generate an AC electromagnetic induction signal, convert the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery.

The technical solution of the embodiment of the present application is applied to a terminal device side. The terminal device supports a wireless charging function. Specifically, the terminal device generates electromagnetic induction between a wireless charging receiving coil and a wireless charging transmitting coil on a charging device (power supply end) side. To generate an AC electromagnetic induction signal.

In the embodiment of the present application, the wireless charging receiving coil is connected to one or more wireless charging matching capacitors, and then connected to the wireless charging conversion module, and the AC electromagnetic induction signal is converted into a DC signal by the wireless charging conversion module, and the DC signal corresponds to Of current is used to charge the battery.

Step 402: Obtain a first control signal during a data packet transmission interval, and control the current of the DC signal to increase based on the first control signal.

In one embodiment, the amplitude of increasing the current of the DC signal may be the same or different each time. For example, if the current is increased twice, the amplitude of the first current increase may be larger than the amplitude of the second current increase, or it may be smaller than the amplitude of the second current increase. Further, the current of the DC signal has a current threshold value, and the current of the DC signal is increased multiple times until the current of the DC signal reaches the current threshold value. That is, iteratively executes the following operations until the current of the DC signal reaches a current threshold: obtaining a first control signal during a data packet transmission interval, and controlling the current of the DC signal to increase based on the first control signal.

The process of increasing the current during the data packet transmission interval not only includes the current gradually increasing during each data packet transmission interval, but also reduces the current during some of the data packet transmission intervals, but the final result still reaches the DC signal. The current reached the current threshold.

In the embodiment of the present application, the obtaining the first control signal during a data packet transmission interval, and controlling the current increase of the DC signal based on the first control signal may be implemented by any of the following schemes:

Option One:

1) determining whether a data packet carried in the AC electromagnetic induction signal is ended based on the AC electromagnetic induction signal;

2) if the data packet transmission ends, generating the first control signal, the first control signal is used to indicate that a data packet transmission in the AC electromagnetic induction signal ends;

3) In response to the first control signal, controlling the current of the DC signal to increase.

Repeat the above steps 1) to 3) until the current of the DC signal reaches a current threshold.

In the embodiment of the present application, the AC electromagnetic induction signal is converted into a binary code stream; the binary code stream is detected to determine whether a data packet is transmitted.

Here, the AC electromagnetic induction signal is converted into a binary code stream by the following steps:

Rectifying the AC electromagnetic induction signal;

Sampling the rectified signal to obtain sampled data;

Perform a shift comparison on the sample data to generate a binary code stream.

In the above solution, performing shift comparison on the sampling data to generate a binary code stream includes: for two adjacent clock cycles in the sampling data, comparing the amplitude of the AC electromagnetic induction signal in the previous clock cycle with The amplitude of the AC electromagnetic induction signal in the next clock cycle is compared; if the amplitude of the AC electromagnetic induction signal in the previous clock cycle is equal to the amplitude of the AC electromagnetic induction signal in the subsequent clock cycle, the latter clock cycle The binary data corresponding to the AC electromagnetic induction signal within is 1; if the amplitude of the AC electromagnetic induction signal in the previous clock cycle is not equal to the amplitude of the AC electromagnetic induction signal in the subsequent clock cycle, The binary data corresponding to the AC electromagnetic induction signal is 0; obtaining the binary data corresponding to the AC electromagnetic induction signal in each clock cycle in the sampling data to generate a binary code stream.

In the above solution, detecting the binary code stream and determining whether a data packet is transmitted includes: detecting the binary code stream, and calculating a check for data packet transmission from a start position of a data packet. And; if the checksum indicates that no data is received within the first time period, it is determined that the data packet transmission ends; wherein the first time period is determined based on the length of one or more of the data packets.

For example: Sum the digital signals in binary format (that is, the binary code stream). If the current data sum satisfies the following formula, S = S + b1 + b2 + ... + b11, S stands for data sum, and b stands for each One bit, it is considered that a data packet transmission is completed.

FIG. 5 is a principle block diagram of Solution 1 provided by an embodiment of the present application. During wireless charging, the decoding module decodes the AC electromagnetic induction signal generated by wireless charging through the 2KHZ frequency provided by the baseband processor, converts the AC electromagnetic induction signal into a binary code stream, and detects The module checks the binary code stream to confirm whether the transmission of the data packet (the data packet is carried in the AC electromagnetic induction signal) is completed. When the data packet is transmitted, the baseband processor is notified that a packet of data has been transmitted, and the baseband processor notifies the charging management. The module increases the charging current, and so cycles until the charging current rises to the set maximum current. The functions and connections of the components in Figure 5 are described below:

Wireless charging receiving coil: It is wound by copper wire or flexible circuit board (FPC), and is coupled with the wireless charging base to receive high-frequency electromagnetic waves generated by the wireless charging base.

Capacitors Cs, Cd: Matching capacitors for wireless charging. Cs and Cd are not unique. Multiple capacitors can be connected in series and parallel. The capacitance of Cs and Cd can be calculated according to the standard calculation method for wireless charging resonance capacitors.

Wireless charging conversion module: It is set to convert the received AC electromagnetic induction signal into a DC signal and output it through VOUT. The wireless charging conversion module outputs a 5V or 9V or 12V DC voltage signal.

Decoding module: Receives the AC electromagnetic induction signal generated by the LC oscillator circuit (ie, the circuit consisting of the wireless charging receiving coil and capacitors Cs, Cd), and generates a binary code stream through rectification, sampling, and shift comparison. The schematic block diagram is shown in Figure 6. Among them, in each sampling cycle, the process rules for decoding the amplitude of the AC electromagnetic induction signal into specific binary data are as follows:

1. If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is equal to the amplitude of the AC electromagnetic induction signal in the current clock cycle, the binary data represented by the AC electromagnetic induction signal in the current clock cycle is 1.

2. If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is not equal to the amplitude of the AC electromagnetic induction signal in the current clock cycle, then the binary data represented by the AC electromagnetic induction signal in the current clock cycle is 0.

Detection module: set to detect the binary code stream. When a packet of data is transmitted, the end-of-data signal is output to the baseband processor. The detection mechanism of the detection module is as follows: The length of each data packet in wireless charging in communication is 11 bits (bits ), By using the data accumulation technology, the checksum of the entire data packet is calculated from the start bit of each packet of data. When there is no data increase for consecutive 11 bits (that is, the length of a data packet), or for multiple consecutive data packets, When there is no data increase within the duration, it is considered that one packet of data has been transmitted, and an end-of-data signal is output.

Baseband processor: Its function is divided into 3 parts. 1. Detecting whether the current charging status is wireless charging. When the wireless charging conversion module works, it receives the status signal (TEMP) of the wireless charging output; 2. It receives the data packets output by the detection module. End signal to notify the charging management module to increase the charging current; 3. Provide a sampling frequency of 2KHZ for the sampling module.

Charging management module: set to receive the DC voltage signal output by wireless charging to charge the terminal battery. At the beginning of wireless charging, it receives the current increase status signal output by the baseband processor, and gradually increases the charging current, as shown in Figures 7 (a) and 7 (b), where FIG. 7 (a) is a load current increase process between every two communication intervals, and FIG. 7 (b) is a current increase multiple times between two communication intervals, or It is also possible to perform a current increase between multiple communication intervals, m represents multiple current increases, and n represents multiple communication intervals. Here, communication refers to the transmission of data packets.

In solution one of the embodiment of the present application, by adding a rectifier module, a sampling module, and a detection module to the LC resonance circuit of the wireless charging receiving coil, the wireless charging communication interval can be automatically detected, and it can be performed between two communication intervals or multiple communication intervals. The charging current is gradually increased until the maximum charging current is reached. In wireless charging, when the wireless charging startup process is completed, that is, when VOUT has a voltage output, the decoding module decodes the AC electromagnetic induction signal generated by wireless charging through the 2KHZ frequency provided by the baseband processor, converts the AC electromagnetic induction signal into a binary code stream, and detects The module checks the binary code stream to confirm whether the data packet transmission is over. When the data packet transmission is over, it notifies the baseband processor that a packet of data has been transmitted. The baseband processor notifies the charging management module to increase the charging current. This cycle is repeated until the charging current. Increase to the set maximum current. When the load current reaches the maximum value, the process ends and the decoding detection module is turned off.

Option II:

1) comparing a first DC voltage and a first voltage threshold corresponding to the DC signal, wherein the first DC voltage is converted to a second DC voltage and used to charge the battery;

2) if the first DC voltage corresponding to the DC signal is greater than or equal to the first voltage threshold value, generating the first control signal, the first control signal is used to indicate that the first DC voltage is greater than or equal to The first voltage threshold;

3) In response to the first control signal, controlling the current of the DC signal to increase.

Repeat the above steps 1) to 3) until the current of the DC signal reaches a current threshold.

Here, the first DC voltage refers to VRECT, and the second DC voltage refers to VOUT. VRECT is converted to VOUT after being processed by a low-dropout linear regulator (Low Drop Output, LDO for short).

In an embodiment, when the first DC voltage corresponding to the DC signal is greater than or equal to the first voltage threshold value, the first control signal is generated after a delay of a second duration; wherein the second duration Determined based on the duration of a data packet. For example, the second duration is the duration of one data packet, or the duration of multiple data packets.

In the above solution, the first DC voltage corresponding to the DC signal is detected; an average value of the first DC voltage within a third time period is counted as the first voltage threshold value; the detected first The DC voltage is compared with the first voltage threshold; wherein the third duration is determined based on the duration of a data packet. Here, the third duration is greater than the duration of one data packet.

The data packet involved in the embodiment of the present application refers to a data packet carried in an AC electromagnetic induction signal. The data packet is also referred to as a wireless charging communication signal, and its length is, for example, 11 bits.

FIG. 8 is a principle block diagram of the second solution provided by the embodiment of the present application. When the wireless charging startup process is completed, that is, when VOUT has a voltage output, voltage detection is started to increase the load current. When it is detected that any VRECT voltage value is greater than the set threshold, one or more data packets are delayed, and then the load current is increased. This cycle is repeated until the charging current rises to the set maximum current, and the sampling module is turned off. The functions and connections of the components in Figure 8 are described below:

Wireless charging receiving coil: It is wound by copper wire or FPC. It is coupled with the wireless charging base to receive high-frequency electromagnetic waves generated by the wireless charging base.

Capacitors Cs, Cd: Matching capacitors for wireless charging. Cs and Cd are not unique. Multiple capacitors can be connected in series and parallel. The capacitance of Cs and Cd can be calculated according to the standard calculation method for wireless charging resonance capacitors.

Wireless charging conversion module: It is set to convert the received AC electromagnetic induction signal into a DC signal and output it through VOUT. The wireless charging conversion module outputs a 5V or 9V or 12V DC voltage signal.

Voltage detection module: The analog VRECT signal is converted into a digital VRECT signal by sampling, and the sampling rate is not less than the data communication rate of wireless charging. Here, the VRECT signal carries signal data (that is, a data packet is transmitted) relative to the VOUT signal.

In the initial stage, the baseband processor receives the voltage signal V output from the voltage detection module, and averages all the voltage signals within the time T. As the first time VRECT sets a threshold M, the time T is greater than the time of one packet of data. The voltage detection is continued. When the detected voltage signal V is greater than the set threshold M, a time of one data packet is delayed for the first load current increase. After the current increase is completed, the voltage detection is continued, and all voltage signals within time T are averaged, as the VRECT second set threshold M, and the time T is greater than the time of one packet of data. When the detected voltage signal V is greater than the set threshold M, a second packet current is increased by delaying the time of one data packet. Repeat this process until the load current increases to the maximum value. The current increase process is shown in Figures 9 (a) and 9 (b). Figure 9 (a) shows the load current increase process between every two communication intervals. FIG. 9 (b) shows that current can be increased multiple times between two communication intervals, or current can be increased once between multiple communication intervals. Here, communication refers to the transmission of data packets. When the load current increases to the maximum, the voltage detection module is turned off.

In solution two of the embodiment of the present application, a voltage detection module is added to the wireless charging output voltage VRECT, and sampling is performed according to the wireless charging data communication rate. When the wireless charging startup process is completed, that is, when VOUT has a voltage output, voltage detection is started to increase the load current. When it is detected that any VRECT voltage value is greater than the set threshold, one or more data packets are delayed before the next data packet arrives, and then the load current is increased. When the load current reaches the maximum value, the process ends and is closed. Sampling module.

third solution:

1) Obtaining a first instruction signal, where the first instruction signal is used to indicate the end of a data packet transmission in the AC electromagnetic induction signal;

2) generating the first control signal based on the first instruction signal, and the first control signal is used to indicate the end of transmission of a data packet in the AC electromagnetic induction signal;

3) In response to the first control signal, controlling the current of the DC signal to increase.

FIG. 10 is a principle block diagram of solution three provided by an embodiment of the present application. The wireless charging conversion module can output a data packet transmission end status signal (TEMP). The baseband processor only needs to receive this signal. After the end of the transmission, the charging management module is notified to increase the current. The current increase process is the same as that in Figure 7 (a), Figure 7 (b), Figure 9 (a), and Figure 9 (b). It can be performed once between two communication intervals or Multiple load current increases, or one or more load current increases between multiple communication intervals.

In the third solution of the embodiment of the present application, the wireless charging conversion module can report a start and end flag of a communication packet in real time, and the baseband processor only needs to detect the flag and increase the charging current between two or more packets.

FIG. 11 is a second flowchart of a charging control method according to an embodiment of the present application. As shown in FIG. 11, the charging control method includes the following steps:

Step 1101: Detection of the charging type.

Step 1102: Determine whether it is wireless charging. If not, go to step 1103, and if yes, go to step 1104.

Step 1103: USB charging.

Step 1104: Rectify the AC electromagnetic induction signal.

Step 1105: Sampling the rectified signal.

Step 1106: Perform a shift comparison on the sampling result to obtain a binary code stream.

Step 1107: Perform end-of-packet detection based on the binary code stream.

Step 1108: Determine whether the data packet ends. If not, go to step 1107, and if yes, go to step 1109.

Step 1109: The baseband processor obtains a data packet end indication signal.

Step 1110: The charging management module obtains a charging current adjustment instruction signal.

Step 1111: Adjust the charging current.

Step 1112: Determine whether the charging current is less than the maximum current IMAX. If yes, go to step 1105; if no, go to step 1113.

Step 1113: Stop increasing the charging current, and charge the battery with the maximum current IMAX.

It should be noted that, by default, the terminal is in the USB charging mode. When wireless charging is turned on, first, the LC oscillating circuit generates an AC electromagnetic induction signal, which is converted into a DC voltage by the wireless charging conversion module. Secondly, the wireless charging conversion module outputs a status signal through the TEMP pin. When wireless charging is working, TEMP = 1, and when wireless charging is not working, TEMP = 0. When TEMP = 1, the baseband processor notifies the charging management module to set the charging current to the minimum current, for example, the minimum current is 500MA or less.

FIG. 12 is a third flowchart of a charging control method according to an embodiment of the present application. As shown in FIG. 12, the charging control method includes the following steps:

Step 1201: Detection of the charging type.

Step 1202: Determine whether it is wireless charging. If not, go to step 1203, and if yes, go to step 1204.

Step 1203: USB charging.

Step 1204: The charge management module detects VOUT.

Step 1205: Determine whether VOUT is greater than 0. If yes, go to Step 1206.

Step 1206: Perform voltage detection on VRECT.

Step 1207: The baseband processor obtains the detection result V.

Step 1208: Determine whether V is greater than the threshold M. If yes, go to Step 1209.

Step 1209: The baseband processor generates an electric current adjustment instruction signal.

Step 1210: The charging management module obtains a current adjustment instruction signal.

Step 1211: Adjust the charging current.

Step 1212: Determine whether the charging current is less than the maximum current IMAX. If yes, go to step 1206; if no, go to step 1213.

Step 1213: Stop increasing the charging current, and charge the battery with the maximum current IMAX.

Step 1214: Turn off the voltage detection module.

FIG. 13 is a fourth flowchart of a charging control method according to an embodiment of the present application. As shown in FIG. 13, the charging control method includes the following steps:

Step 1301: Detection of the charging type.

Step 1302: Determine whether it is wireless charging. If not, go to step 1303, and if yes, go to step 1304.

Step 1303: USB charging.

Step 1304: The charge management module detects VOUT.

Step 1305: It is determined whether VOUT is greater than 0. If yes, step 1306 is performed.

Step 1306: Determine whether the data packet transmission is completed based on the TEMP. If yes, perform step 1307.

Step 1307: The baseband processor generates an electric current adjustment instruction signal.

Step 1308: The charging management module obtains a current adjustment instruction signal.

Step 1309: Adjust the charging current.

Step 1310: Determine whether the charging current is less than the maximum current IMAX. If yes, go to step 1306; if no, go to step 1311.

Step 1311: Stop increasing the charging current, and charge the battery with the maximum current IMAX.

FIG. 14 is a schematic structural composition diagram of a charging control device according to an embodiment of the present application. As shown in FIG. 14, the device includes:

The electromagnetic induction unit 1401 is configured to generate an AC electromagnetic induction signal;

The AC / DC conversion unit 1402 is configured to convert the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery;

The current control unit 1403 is configured to obtain a first control signal during a data packet transmission interval, and control the current of the DC signal to increase based on the first control signal.

In one embodiment, the current control unit 1403 is configured to determine, based on the AC electromagnetic induction signal, whether a data packet carried in the AC electromagnetic induction signal is ended; if the data packet transmission is ended, generate The first control signal is used to indicate the end of a data packet transmission in the AC electromagnetic induction signal; and in response to the first control signal, the current of the DC signal is controlled to increase.

In one embodiment, the current control unit 1403 is configured to: convert the AC electromagnetic induction signal into a binary code stream; detect the binary code stream to determine whether a data packet is transmitted.

In one embodiment, the current control unit 1403 is configured to: rectify the AC electromagnetic induction signal; sample the rectified signal to obtain sample data; perform shift comparison on the sample data to generate a binary code flow.

In one embodiment, the current control unit 1403 is configured to: for two adjacent clock cycles in the sampling data, compare the amplitude of the AC electromagnetic induction signal in the previous clock cycle with the AC power in the next clock cycle Compare the magnitude of magnetic induction signals;

If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is equal to the amplitude of the AC electromagnetic induction signal in the next clock cycle, the binary data corresponding to the AC electromagnetic induction signal in the next clock cycle is 1; if the If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is not equal to the amplitude of the AC electromagnetic induction signal in the following clock cycle, then the binary data corresponding to the AC electromagnetic induction signal in the next clock cycle is 0; The binary data corresponding to the AC electromagnetic induction signal in each clock cycle in the sampling data is generated to generate a binary code stream.

In an embodiment, the current control unit 1403 is configured to detect the binary code stream and calculate a checksum of data packet transmission starting from a start position of a data packet; if the checksum characterizes If no data is received within the first time period, it is determined that the data packet transmission is ended;

The first duration is determined based on the length of one or more of the data packets.

In one embodiment, the current control unit 1403 is configured to:

Comparing a first DC voltage and a first voltage threshold corresponding to the DC signal, wherein the first DC voltage is converted to a second DC voltage and used to charge the battery; if the DC signal corresponds to If the first DC voltage is greater than or equal to the first voltage threshold, the first control signal is generated, and the first control signal is used to indicate that the first DC voltage is greater than or equal to the first voltage threshold; In response to the first control signal, the current controlling the DC signal is increased.

In one embodiment, the current control unit 1403 is configured to: when the first DC voltage corresponding to the DC signal is greater than or equal to the first voltage threshold value, generate the first A control signal; wherein the second duration is determined based on a duration of a data packet.

In one embodiment, the current control unit 1403 is configured to:

Detecting the first DC voltage corresponding to the DC signal; counting an average value of the first DC voltage within a third period of time as the first voltage threshold value; and comparing the detected first DC voltage with all the Comparing the first voltage threshold;

The third duration is determined based on the duration of a data packet.

In one embodiment, the current control unit 1403 is configured to:

Obtaining a first indication signal, the first indication signal is used to indicate the end of a data packet transmission in the AC electromagnetic induction signal; and based on the first indication signal, generating the first control signal, the first control signal It is used to indicate the end of transmission of a data packet in the AC electromagnetic induction signal; in response to the first control signal, controlling the current of the DC signal to increase.

In one embodiment, the current control unit 1403 is configured to iteratively perform the following operations until the current of the DC signal reaches a current threshold: obtaining a first control signal during a data packet transmission interval, based on the first The control signal controls the current of the DC signal to increase.

In an application scenario, referring to FIG. 5, the electromagnetic induction unit can be implemented by a wireless charging receiving coil, the AC-DC conversion unit can be implemented by a wireless charging conversion module, and the current control unit can be implemented by a decoding module, a detection module, and a baseband processor And charge management module.

In another application scenario, referring to FIG. 8, the electromagnetic induction unit may be implemented by a wireless charging receiving coil, the AC / DC conversion unit may be implemented by a wireless charging conversion module, and the current control unit may be implemented by a voltage detection module, a baseband processor, Charge management module.

In another application scenario, referring to FIG. 10, the electromagnetic induction unit may be implemented by a wireless charging receiving coil, the AC / DC conversion unit may be implemented by a wireless charging conversion module, and the current control unit may be implemented by a baseband processor and a charge management module achieve.

Those skilled in the art should understand that the implementation functions of the units in the charging control device shown in FIG. 14 can be understood by referring to the related description of the foregoing charging control method. The functions of the units in the charge control device shown in FIG. 14 may be implemented by a program running on a processor, or may be implemented by a specific logic circuit.

FIG. 15 is a schematic structural composition diagram of a terminal device according to an embodiment of the present application. As shown in FIG. 15, the terminal device includes the charging control device 1501 and the battery 1502 described in FIG. 14;

The charging control device 1501 is configured to generate an AC electromagnetic induction signal, convert the AC electromagnetic induction signal into a DC signal, and the DC signal is used to charge the battery 1502. The following operations are performed iteratively until The current reaches the current threshold: obtaining a first control signal, and controlling the current of the DC signal to increase based on the first control signal.

Those skilled in the art should understand that the charging control device 1501 can be understood with reference to the foregoing description of the charging control method.

The technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

In the several embodiments provided in this application, it should be understood that the disclosed method and smart device may be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, such as multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed components are coupled, or directly coupled, or communicated with each other through some interfaces. The indirect coupling or communication connection of the device or unit may be electrical, mechanical, or other forms. of.

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, which may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into a second processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into a unit; The above integrated unit may be implemented in the form of hardware, or in the form of hardware plus software functional units.

The above is only a specific implementation of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the protection scope of this application.

Industrial applicability

The technical solution of the embodiment of the present application generates an AC electromagnetic induction signal, converts the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery; and a first control signal is obtained during a data packet transmission interval, The current of the DC signal is controlled to increase based on the first control signal. With the technical solution of the embodiment of the present application, the charging current during the wireless charging is slowly increased, which avoids the problem of voltage drop during the charging current increase and during the dynamic and rapid adjustment of the current. Further, wireless charging can be performed normally and stably. Current charging for true fast charging.

Claims (23)

A charging control method, the method includes: Generating an AC electromagnetic induction signal, converting the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery; A first control signal is obtained during a data packet transmission interval, and the current of the DC signal is controlled to increase based on the first control signal. The method according to claim 1, wherein said obtaining a first control signal during a data packet transmission interval and controlling an increase in current of said DC signal based on said first control signal comprises: Determining whether the transmission of a data packet carried in the AC electromagnetic induction signal is completed based on the AC electromagnetic induction signal; If the data packet transmission ends, generating the first control signal, where the first control signal is used to indicate that a data packet transmission in the AC electromagnetic induction signal ends; In response to the first control signal, the current controlling the DC signal is increased. The method according to claim 2, wherein determining, based on the AC electromagnetic induction signal, whether a data packet carried in the AC electromagnetic induction signal ends, comprises: Converting the AC electromagnetic induction signal into a binary code stream; The binary code stream is detected to determine whether a data packet is transmitted. The method according to claim 3, wherein the step of converting the AC electromagnetic induction signal into a binary code stream comprises: Rectifying the AC electromagnetic induction signal; Sampling the rectified signal to obtain sampled data; Perform a shift comparison on the sample data to generate a binary code stream. The method according to claim 4, wherein the performing a shift comparison on the sample data to generate a binary code stream comprises: Comparing the amplitude of the AC electromagnetic induction signal in the previous clock cycle with the amplitude of the AC electromagnetic induction signal in the next clock cycle for two adjacent clock cycles in the sampling data; If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is equal to the amplitude of the AC electromagnetic induction signal in the next clock cycle, the binary data corresponding to the AC electromagnetic induction signal in the next clock cycle is 1; If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is not equal to the amplitude of the AC electromagnetic induction signal in the subsequent clock cycle, the binary data corresponding to the AC electromagnetic induction signal in the subsequent clock cycle is 0; Obtain binary data corresponding to the AC electromagnetic induction signal in each clock cycle in the sampling data to generate a binary code stream. The method according to any one of claims 3 to 5, wherein the detecting the binary code stream to determine whether a data packet transmission ends includes: Detecting the binary code stream, and calculating a checksum of data packet transmission from a starting position of a data packet; If the checksum indicates that no data is received within the first time period, it is determined that the data packet transmission ends; The first duration is determined based on the length of one or more of the data packets. The method according to claim 1, wherein said obtaining a first control signal during a data packet transmission interval and controlling an increase in current of said DC signal based on said first control signal comprises: Comparing a first DC voltage and a first voltage threshold corresponding to the DC signal, wherein the first DC voltage is converted to a second DC voltage and used to charge the battery; If the first DC voltage corresponding to the DC signal is greater than or equal to the first voltage threshold, generating the first control signal, and the first control signal is used to indicate that the first DC voltage is greater than or equal to the first DC voltage A first voltage threshold; In response to the first control signal, the current controlling the DC signal is increased. The method according to claim 7, wherein if the first DC voltage corresponding to the DC signal is greater than or equal to the first voltage threshold, generating the first control signal comprises: When the first DC voltage corresponding to the DC signal is greater than or equal to the first voltage threshold value, the first control signal is generated after a delay of a second duration; The second duration is determined based on the duration of a data packet. The method according to claim 7, wherein the comparing the first DC voltage and the first voltage threshold corresponding to the DC signal comprises: Detecting a first DC voltage corresponding to the DC signal; Counting an average value of the first DC voltage within a third duration as the first voltage threshold value; Comparing the detected first DC voltage with the first voltage threshold; The third duration is determined based on the duration of a data packet. The method according to claim 1, wherein said obtaining a first control signal during a data packet transmission interval and controlling an increase in current of said DC signal based on said first control signal comprises: Obtaining a first indication signal, where the first indication signal is used to indicate the end of transmission of a data packet in the AC electromagnetic induction signal; Generating the first control signal based on the first instruction signal, where the first control signal is used to indicate the end of transmission of a data packet in the AC electromagnetic induction signal; In response to the first control signal, the current controlling the DC signal is increased. The method according to claim 1, further comprising: Iteratively perform the following operations until the current of the DC signal reaches a current threshold: obtaining a first control signal during a data packet transmission interval, and controlling the current of the DC signal to increase based on the first control signal. A charging control device, the device includes: An electromagnetic induction unit configured to generate an AC electromagnetic induction signal; An AC / DC conversion unit configured to convert the AC electromagnetic induction signal into a DC signal, and a current corresponding to the DC signal is used to charge a battery; The current control unit is configured to obtain a first control signal during a data packet transmission interval, and control the current of the DC signal to increase based on the first control signal. The device according to claim 12, wherein the current control unit is configured to determine, based on the AC electromagnetic induction signal, whether a data packet carried in the AC electromagnetic induction signal has been transmitted; if the data packet is transmitted At the end, the first control signal is generated, and the first control signal is used to indicate the end of a data packet transmission in the AC electromagnetic induction signal; in response to the first control signal, the current of the DC signal is controlled to increase. The device according to claim 13, wherein the current control unit is configured to: convert the AC electromagnetic induction signal into a binary code stream; detect the binary code stream to determine whether a data packet is transmitted. The device according to claim 14, wherein the current control unit is configured to: rectify the AC electromagnetic induction signal; sample the rectified signal to obtain sample data; and perform shift comparison on the sample data To generate a binary code stream. The device according to claim 15, wherein the current control unit is configured to: for two adjacent clock cycles in the sampling data, compare the amplitude of the AC electromagnetic induction signal in the previous clock cycle with the latter clock Compare the amplitude of the AC electromagnetic induction signals in the period; If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is equal to the amplitude of the AC electromagnetic induction signal in the next clock cycle, the binary data corresponding to the AC electromagnetic induction signal in the next clock cycle is 1; if the If the amplitude of the AC electromagnetic induction signal in the previous clock cycle is not equal to the amplitude of the AC electromagnetic induction signal in the following clock cycle, then the binary data corresponding to the AC electromagnetic induction signal in the next clock cycle is 0; The binary data corresponding to the AC electromagnetic induction signal in each clock cycle in the sampling data is generated to generate a binary code stream. The device according to any one of claims 14 to 16, wherein the current control unit is configured to detect the binary code stream and calculate a checksum of a data packet transmission from a start position of a data packet. And; if the checksum indicates that no data has been received within the first time period, it is determined that the data packet transmission ends; The first duration is determined based on the length of one or more of the data packets. The device according to claim 12, wherein the current control unit is configured to: Comparing a first DC voltage and a first voltage threshold corresponding to the DC signal, wherein the first DC voltage is converted to a second DC voltage and used to charge the battery; if the DC signal corresponds to If the first DC voltage is greater than or equal to the first voltage threshold, the first control signal is generated, and the first control signal is used to indicate that the first DC voltage is greater than or equal to the first voltage threshold; In response to the first control signal, the current controlling the DC signal is increased. The device according to claim 18, wherein the current control unit is configured to: when the first DC voltage corresponding to the DC signal is greater than or equal to the first voltage threshold value, generate the signal after a delay of a second duration; The first control signal; wherein the second duration is determined based on a duration of a data packet. The apparatus according to claim 18, wherein the current control unit is configured to: Detecting the first DC voltage corresponding to the DC signal; counting an average value of the first DC voltage within a third period of time as the first voltage threshold value; and comparing the detected first DC voltage with all the Comparing the first voltage threshold; The third duration is determined based on the duration of a data packet. The apparatus according to claim 12, wherein the current control unit is configured to: Obtaining a first indication signal, the first indication signal is used to indicate the end of a data packet transmission in the AC electromagnetic induction signal; and based on the first indication signal, generating the first control signal, the first control signal It is used to indicate the end of transmission of a data packet in the AC electromagnetic induction signal; in response to the first control signal, controlling the current of the DC signal to increase. The apparatus according to claim 12, wherein the current control unit is configured to: Iteratively perform the following operations until the current of the DC signal reaches a current threshold: obtaining a first control signal during a data packet transmission interval, and controlling the current of the DC signal to increase based on the first control signal. A terminal device comprising the charging control device and a battery according to any one of claims 12 to 22, wherein the charging control device is configured to generate an AC electromagnetic induction signal, convert the AC electromagnetic induction signal into a DC signal, and The DC signal is used to charge the battery; iteratively performs the following operations until the current of the DC signal reaches a current threshold: obtaining a first control signal and controlling the current of the DC signal based on the first control signal increase.

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