CN117491888A - Resistance value calibration method, calibration circuit, terminal equipment and storage medium - Google Patents

Abstract

Embodiments of the present invention provide a resistance value calibration method, calibration circuit, terminal equipment and storage medium, belonging to the field of electronic technology. The method includes: obtaining the current value of the preset wire and obtaining the voltage value of the preset wire, wherein the preset wire is connected to the battery; determining the target resistance value of the preset wire according to the current value and the voltage value; based on the target resistance value to calibrate the resistance value of the preset wire. The resistance value of the preset wire is used to measure the change in battery power. The technical solution of the embodiment of the present invention can improve the detection accuracy of changes in battery power.

Description

Resistance value calibration method, calibration circuit, terminal equipment and storage medium

Technical field

The present invention relates to the field of electronic technology, and in particular to a resistance value calibration method, calibration circuit, terminal equipment and storage medium.

Background technique

With the development of battery charging and discharging technology, it is necessary to use high-precision sampling resistors to detect battery power changes during charging or discharging. In order to meet the requirements for passing large currents, high-precision sampling resistors generally require smaller resistance values, higher accuracy, and larger packages, such as a sampling resistor of 5 milliohms, an accuracy of 1%, and a 1206 package. A larger packaged sampling resistor will occupy a larger area on the circuit board, and will easily generate higher heat when passing a large current. If the heat cannot be exported in time, it will affect the charging and discharging power and the sampling accuracy of the sampling resistor, thus affecting the battery. Detection accuracy of power changes.

Contents of the invention

Embodiments of the present invention provide a resistance value calibration method, calibration circuit, terminal equipment and storage medium, aiming to use the preset wire as the sampling resistor of the battery, which can reduce the occupied area of the sampling resistor, improve the heat dissipation performance of the sampling resistor, and improve Detection accuracy of battery power changes.

In a first aspect, an embodiment of the present invention provides a resistance value calibration method, including: obtaining a current value of a preset wire, and obtaining a voltage value of the preset wire, wherein the preset wire is connected to a battery; according to the The current value and the voltage value are used to determine the target resistance value of the preset wire; based on the target resistance value, the resistance value of the preset wire is calibrated, and the resistance value of the preset wire is used to calculate the Describe the changes in battery power.

In a second aspect, embodiments of the present invention further provide a calibration circuit. The calibration circuit includes a preset wire and a processor; the preset wire is used to connect the battery, and the resistance value of the preset wire is used to measure the The battery power changes; the processor is configured to execute any resistance value calibration method provided by the embodiment of the present invention.

In a third aspect, an embodiment of the present invention further provides a terminal device, characterized in that the terminal device includes a battery and a calibration circuit as provided in the embodiment of the present invention, and the battery is connected to a preset wire in the calibration circuit. .

In a fourth aspect, embodiments of the present invention further provide a storage medium for computer-readable storage, characterized in that the storage medium stores one or more programs, and the one or more programs can be read by one or more A processor is executed to implement any resistance value calibration method provided by the embodiment of the present invention.

The embodiment of the present invention provides a resistance value calibration method, calibration circuit, terminal equipment and storage medium. The embodiment of the present invention obtains the current value of the preset wire and obtains the voltage value of the preset wire, wherein the preset wire is connected For the battery; determine the target resistance value of the preset wire based on the current value and voltage value; calibrate the resistance value of the preset wire based on the target resistance value, and the resistance value of the preset wire is used to measure the change in battery power. The embodiment of the present invention uses the preset wire as the sampling resistor of the battery, which occupies a smaller area and has better heat dissipation performance, so it has less impact on the sampling accuracy. At the same time, calibrating the resistance value of the preset wire through the target resistance value can greatly improve the detection accuracy of battery power changes.

Description of drawings

Figure 1 is a schematic flow chart of the steps of a resistance value calibration method provided by an embodiment of the present invention;

Figure 2 is a schematic flowchart of the sub-steps of the resistance value calibration method in Figure 1;

Figure 3 is a schematic circuit diagram for implementing a resistance value calibration method provided by an embodiment of the present invention;

Figure 4 is another circuit schematic diagram for implementing the resistance value calibration method provided by the embodiment of the present invention;

Figure 5 is another circuit schematic diagram for implementing the resistance value calibration method provided by the embodiment of the present invention;

Figure 6 is another circuit schematic diagram for implementing the resistance value calibration method provided by the embodiment of the present invention;

Figure 7 is a schematic structural block diagram of a calibration circuit provided by an embodiment of the present invention;

Figure 8 is a schematic structural block diagram of a terminal device provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all contents and operations/steps, nor are they necessarily performed in the order described. For example, some operations/steps can also be decomposed, combined or partially merged, so the actual order of execution may change according to actual conditions.

It should be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly dictates otherwise.

In order to accurately detect the power changes of the terminal equipment during charging or discharging, it is often necessary to add a sampling resistor for detection. The sampling resistor generally requires a smaller resistance value, higher precision, and larger package to meet the requirements of a larger package. High Current. Such as 5 milliohm, 10 milliohm, accuracy 1%, 0805 package and 1206 package, etc. These larger packaged devices occupy a larger area on the circuit board, which is not conducive to simplified circuit board design and increases cost. They also generate high heat when passing large currents, such as when a 5 milliohm sampling resistor passes a 10A current. The thermal power generated is 0.5W. If the heat cannot be exported in time, it will cause the terminal equipment to heat up, affecting the charging power. Moreover, various resistors have thermal effects. As the heat increases, the resistance accuracy will also change, affecting the sampling accuracy and further affecting the power detection of the terminal equipment.

Based on this, the inventor thought that when designing a PCB (Printed Circuit Board, printed circuit board), the impedance characteristics of the preset wires in the PCB board can be effectively used, such as using the impedance of the copper in the PCB board as a sampling resistor. , the impedance is generally only a few milliohms, which can meet the requirements of the sampling resistor for power detection, which not only reduces the cost but also reduces the heating of the sampling resistor, and makes the design more flexible.

However, when using preset wires such as copper as the sampling resistor, the processing accuracy of the preset wires is difficult to control. During processing, the actual impedance or resistance value of the preset wires in each PCB board cannot be measured. The higher the impedance processing accuracy of the preset wires, the higher the defective rate of the PCB board. For example, if the impedance processing accuracy of the preset wires in the PCB board is required to be controlled to 1%, there will be a 24% defective rate. For a 5 milliohm sampling resistor, theoretical analysis shows that every error of 0.01 milliohm will have a great impact on the user when charging with a large current. If the current is 10A, the impact will be 100mAh in 1 hour, which means the corresponding battery capacity is 2%. During high-power charging, the current flowing through the sampling resistor is greater than 10A, so the resistance value of the sampling resistor is required to be smaller, and some are even 1 milliohm in order to reduce heat generation. It can be seen that how to reduce the processing accuracy requirements of PCB boards, reduce the defective rate, and improve the sampling accuracy of preset wires has become an urgent problem that needs to be solved.

Embodiments of the present invention provide a resistance value calibration method, calibration circuit, terminal equipment and storage medium. Among them, the resistance value calibration method can be applied to terminal equipment equipped with batteries. The terminal equipment can be electronic equipment such as mobile phones, tablet computers, notebook computers, desktop computers, personal digital assistants, and wearable devices.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments may be combined with each other without conflict.

Please refer to FIG. 1 , which is a schematic flow chart of a resistance value calibration method according to an embodiment of the present invention.

As shown in Figure 1, the resistance value calibration method includes steps S101 to S103.

Step S101: Obtain the current value of the preset wire and obtain the voltage value of the preset wire.

Among them, the preset wire is connected to the battery, and the resistance of the preset wire is small, for example, 5 milliohms, so that the change in power of the battery during charging or discharging can be accurately detected. Among them, the resistance value of the preset wire is used to measure the change of battery power. For example, the charging current or discharge current of the battery can be calculated through the resistance value of the preset wire and the voltage value of the preset wire, so that the charging current or discharge current of the battery can be calculated. Detect battery power changes during charging or discharging.

In one embodiment, the preset wires include circuit wires on a PCB (Printed Circuit Board). The preset wires are, for example, copper. Of course, they can also be wires made of other metals or conductive materials. During the production process of the PCB board, the length, width, thickness, material, shape, position, etc. of the preset wire can be set according to the actual situation, for example, based on the reference resistance value of the sampling resistor, which is not specified in this embodiment. limited.

The battery includes a lithium battery, an alkaline zinc-manganese battery, a nickel-cadmium battery, a nickel-hydrogen battery, etc. The battery can be a single battery or a battery module composed of multiple batteries, which is not specifically limited in this embodiment. . The connection relationship between the preset wire and the battery can be set according to the actual situation. The preset wire can be connected to the negative pole or negative pole of the battery, and the preset wire can also be connected to other devices or circuits. For example, when the first end of the preset wire is connected to the negative electrode of the battery, and the second end of the preset wire is grounded, a voltmeter can be connected between the first end and the second end of the preset wire, and the voltmeter is used for Detect the voltage value at both ends of the preset wire.

In the embodiment of this application, the preset wire is used as the sampling resistor of the battery. Compared with the conventional sampling resistor, the preset wire occupies a smaller area on the PCB board and has better heat dissipation performance. Therefore, the sampling accuracy of the battery power change is improved. Less affected. At the same time, it is conducive to the simplified design of the PCB board, saves dedicated sampling resistor components, and can reduce circuit costs. At the same time, it can reduce the processing accuracy requirements of PCB circuits, reduce the defective rate, and improve the power detection accuracy.

In one embodiment, obtaining the current value of the preset wire includes: obtaining multiple charging currents or multiple discharging currents of the battery; determining the average value of the multiple charging currents or multiple discharging currents to obtain an average current value. The current value is used as the current value of the preset wire. Among them, multiple charging currents or multiple discharging currents can be read through ammeters, charging and discharging chips and other devices. The multiple charging currents can be collected separately at multiple charging moments during the battery charging process. The multiple discharging currents can be It is collected at multiple discharge moments during the battery discharge process.

It should be noted that by calculating the average current value of multiple charging currents or multiple discharging currents as the current value of the preset wire, the accuracy of the current value of the preset wire can be improved, thereby improving the target resistance value of the preset wire. Calculation accuracy. It can be understood that in practical applications, a charging current during the battery charging process can also be collected as the current value of the preset wire, or a discharge current during the battery discharge process can be collected as the current value of the preset wire. In practical applications, the current value of the preset wire can also be determined by calculating the weighted average of multiple charging currents or multiple discharging currents, which is not specifically limited in this embodiment.

In one embodiment, obtaining multiple charging currents of the battery includes: obtaining the output power of the charging chip, and obtaining the output voltage of the charging chip, wherein the charging chip is connected to the battery; and determining based on the output power and output voltage of the charging chip. The output current of the charging chip; determine the charging current of the battery based on the output current of the charging chip and the preset consumption current.

Among them, the preset consumption current is the loss current of other components of the circuit system. The output current of the charging chip flows to the battery and other components. Therefore, the charging current I of the battery is usually equal to the output current IOUT of the charging chip and the preset consumption current ILOSE. The difference between , that is, I=IOUT-ILOSE. The output current IOUT of the charging chip is usually equal to the ratio between the output power POUT and the output voltage VOUT of the charging chip, that is, IOUT=POUT/VOUT. It should be noted that the multiple charging currents of the battery can be accurately obtained through the charging chip connected to the battery, thereby improving the accuracy of calibration of the resistance value of the preset wire.

It is understandable that in practical applications, multiple discharge currents of the battery can also be obtained through the discharge chip. For example, obtain the input current of the discharge chip; determine the discharge current of the battery based on the input current of the discharge chip and the preset consumption current. Among them, the discharge current of the battery flows to the discharge chip and other components, so the discharge current of the battery is usually equal to the sum of the input current of the discharge chip and the preset consumption current. In some embodiments, the charging chip and the discharging chip can also be integrated into the same chip, such as a charging and discharging chip, which is not specifically limited in this embodiment.

In one embodiment, obtaining the output power of the charging chip includes: obtaining the input voltage and input current of the charging chip, and determining the power conversion efficiency of the charging chip; determining the output of the charging chip based on the input voltage, input current, and power conversion efficiency. power. Among them, the power conversion efficiency of the charging chip can be preset according to the actual situation, and the power conversion efficiency can reflect the conversion efficiency of the charging chip for input power. It should be noted that the output power of the charging chip can be obtained by calculating the product between the input voltage, input current and power conversion efficiency. By calculating the product between the input voltage, input current and power conversion efficiency, the output power of the charging chip can be accurately obtained, thereby improving the detection accuracy of battery power changes.

For example, the charging chip knows the power conversion efficiency of each charging stage, and the power conversion efficiency may also be called charging efficiency or charging conversion efficiency. When charging, select the input voltage (VBUS) and input current (IBUS) of the charging chip after the charging stage is stable. A period of charging when VBUS and IBUS do not transition is selected as the time period for calculating the sampling resistor in the present invention. The output power POUT of the charging chip = VBUS*IBUS* (power conversion efficiency).

In one embodiment, determining the charging current of the battery based on the output current of the charging chip and the preset consumption current includes: determining the current operating mode of the circuit system including the charging chip, and obtaining the preset consumption corresponding to the current operating mode. Current; determine the charging current of the battery based on the difference between the output current of the charging chip and the preset consumption current.

Among them, the current operating mode of the circuit system of the charging chip can include multiple types, such as shutdown mode, low power mode, standby mode, flight mode and other low power consumption modes. The operating mode of the circuit system can be defined by the engineer. The operating mode can be The mode set by the software. The current consumption of the circuit system can be different in each operating mode. Therefore, it is necessary to obtain the preset current consumption corresponding to the current operating mode, and calculate the difference between the output current of the charging chip and the preset consumption current to obtain the battery charge. current, thereby improving the calculation accuracy of the battery charging current.

It should be noted that in order to reduce the impact of the circuit system on the calculation accuracy of the target resistance value of the preset wire and reduce the impact of system power consumption, the current value and voltage value of the preset wire can be obtained in the above-mentioned low power consumption mode. . At the same time, the current value and voltage value of the preset wire can be obtained after the circuit system enters the above-mentioned low-power consumption mode and the current is stable. For example, after entering the above-mentioned low-power consumption mode for a preset time, calculate the output current of the charging chip and The difference between the preset consumption currents is used to obtain the battery charging current. For another example, after a device with a bright screen turns off its screen, the difference between the output current of the charging chip and the preset consumption current is calculated to obtain the charging current of the battery.

In one embodiment, obtaining the voltage value of the preset wire includes: reading the voltage at both ends of the preset wire to obtain the first voltage and the second voltage; determining the voltage difference between the first voltage and the second voltage; according to The voltage difference determines the voltage value of the preset conductor. The first voltage and the second voltage may be read through a fuel gauge built into the power management chip. Of course, the first voltage and the second voltage can also be read by a device such as a voltmeter. It should be noted that by calculating the voltage difference between the first voltage and the second voltage at both ends of the preset conductor, the voltage value of the preset conductor can be accurately obtained.

For example, the voltage at both ends of the preset wire is read through the built-in fuel gauge of the power management chip, which is recorded as V1 and V2. V1 is a high potential and V2 is a low potential. Then the voltage value of the preset wire is V=V1-V2.

It should be noted that the voltage difference can be one or more. When there are multiple voltage differences, the average of the multiple voltage differences can be calculated as the voltage value of the preset wire. The multiple voltage differences can be obtained at different times during the charging or discharging process of the battery. Improved the calculation accuracy of voltage values for preset wires. The method of obtaining the voltage value of the preset conductor may refer to the corresponding embodiment of obtaining the current value of the preset conductor. The timing of obtaining the voltage value of the preset conductor may be the same as or different from the timing of obtaining the current value of the preset conductor.

Step S102: Determine the target resistance value of the preset wire according to the current value and voltage value.

In one embodiment, the ratio between the voltage value and the current value of the preset conductor is calculated according to Ohm's formula to obtain the target resistance value of the preset conductor. It should be noted that the target resistance value is the actual resistance value of the preset wire. The preset wire can be manufactured with the reference resistance value as the reference standard. Due to the existence of processing errors, the target resistance value is usually different from the reference of the preset wire. resistance. Therefore, it is necessary to calculate the target resistance value of the preset wire in order to accurately calibrate the resistance value of the preset wire.

It should be noted that the target resistance value of the preset wire is recorded as Z_sense, assuming that the reference resistance value of the preset wire is 5 milliohms. If the target resistance value Z_sense>5, the voltage across the preset wire is greater than the voltage across the 5 milliohm resistor when the same current flows. Then the sampled current when calculating the power change is greater than the actual current, which will cause the battery to be fully charged in advance or report 100%. On the contrary, if the target resistance value Z_sense<5, it will cause the battery charging time to be prolonged or the battery will not be fully charged.

For example, sequentially read the charging current of the charging chip within a period of time after charging is stable, and take the average value of multiple charging currents as the current value of the preset wire, recorded as ΔI. Collect multiple voltage differences at both ends of the preset wire as V=V1-V2, and take the average value of the multiple voltage differences as the voltage value of the preset wire, recorded as △V. Then the target resistance value of the preset wire is Z_sense=△V/△I.

Step S103: Calibrate the resistance value of the preset wire based on the target resistance value.

Among them, the preset wire is connected to the battery, and the resistance value of the preset wire is used to measure the change in battery power. The resistance of the preset wire is usually small, for example, 1 milliohm to 10 milliohm, which enables accurate detection of changes in battery power during charging or discharging.

It should be noted that during the processing of the circuit board, there are differences in the processing accuracy of the preset wires, so the resistance values of different preset wires are usually different, and the resistance values of the preset wires are used to measure changes in battery power. Therefore, it is necessary to set a unified reference resistance value for the preset wire. Current detection methods for battery power changes all use this unified reference resistance value for calculation. In this embodiment, the target resistance value of the preset wire is calculated and the resistance value of the preset wire is calibrated based on the target resistance value. As a result, the battery power change can be detected through the calibrated resistance value, which can greatly improve the detection accuracy of the battery power change.

In one embodiment, the resistance value of the preset wire is assigned as the target resistance value to realize calibration of the resistance value of the preset wire. By using the target resistance value of the preset wire as a measurement parameter for changes in battery power, ensuring the accuracy of the resistance of the preset wire can greatly improve the detection accuracy of changes in battery power.

In an embodiment, as shown in Figure 2, step S103 includes: sub-steps S1031 to sub-step S1033.

Sub-step S1031: Obtain the reference resistance value of the preset wire.

The preset wire is manufactured with a reference resistance value as a reference standard, and the reference resistance value is, for example, 5 milliohms. The reference resistance value can be stored in the memory in advance, so that the reference resistance value of the preset wire can be obtained from the memory.

Sub-step S1032: Determine the calibration parameters of the resistance value of the preset wire according to the target resistance value and the reference resistance value.

In one embodiment, the ratio of the target resistance value to the reference resistance value is determined; the ratio of the target resistance value to the reference resistance value is used as a calibration parameter for the resistance value of the preset wire. It should be noted that the calibration parameter of the resistance value of the preset wire can be the ratio of the target resistance value to the reference resistance value. The resistance value of the preset wire can be easily calibrated through the ratio of the target resistance value to the reference resistance value.

For example, the reference resistance value of the preset wire is R1, the target resistance value of the preset wire is R2, α is set as the calibration parameter, or the sampling resistance compensation coefficient, and the calibration parameter α=R1/R2. If α=1, it means that the actual target resistance value of the preset wire is equal to the configured reference resistance value. If α>1, it means that the actual target resistance value of the preset wire is less than the configured reference resistance value. If α<1, it means that the actual target resistance value of the preset wire is greater than the configured reference resistance value.

In one embodiment, the difference between the target resistance value and the reference resistance value is determined; the difference between the target resistance value and the reference resistance value is used as a calibration parameter for the resistance value of the preset wire. It should be noted that the calibration parameter of the resistance value of the preset wire can be the difference between the target resistance value and the reference resistance value. The resistance value of the preset wire can be quickly and conveniently calculated through the difference between the target resistance value and the reference resistance value. calibration.

Sub-step S1033: Calibrate the resistance value of the preset wire through the calibration parameters and the reference resistance value.

In one embodiment, the calibration parameter is the ratio of the target resistance value and the reference resistance value; the product value between the calibration parameter and the reference resistance value is determined, and the resistance value of the preset wire is adjusted to the product value. It should be noted that using the product value between the calibration parameter and the reference resistance value as the resistance value of the preset wire can ensure the accuracy of the resistance value of the preset wire and greatly improve the detection accuracy of battery power changes.

For example, the calibration parameter is the ratio α of the target resistance value to the reference resistance value, and the reference resistance value of the preset wire is R1. Calculate the product value α*R1 between the calibration parameter α and the reference resistance value R1, and let the resistance value of the preset wire be α*R1.

In one embodiment, the calibration parameter is the difference between the target resistance value and the reference resistance value; the sum between the calibration parameter and the reference resistance value is determined, and the resistance value of the preset wire is adjusted to the difference between the calibration parameter and the reference resistance value. between and. It should be noted that using the sum between the calibration parameter and the reference resistance value as the resistance value of the preset wire can ensure the accuracy of the resistance value of the preset wire and greatly improve the detection accuracy of battery power changes.

In one embodiment, the preset wire may be connected to the negative electrode or negative electrode of the battery. For example, one end of the preset wire is connected to the negative terminal of the battery and the other end is grounded. For another example, one end of the default wire is connected to the positive electrode of the battery, and the other end is connected to the charging chip. For another example, one end of the default wire is connected to the positive electrode of the battery, and the other end is connected to the discharge chip.

For example, as shown in Figure 3, if the preset wire 20 set as the sampling resistor is connected to the positive electrode of the battery 10, then a section of copper between the charging chip 30 and the positive electrode of the battery 10 is selected as the preset wire during PCB design. 20. For example, as shown in FIG. 4 , if the preset wire 20 set as the sampling resistor is connected to the negative electrode of the battery 10 , a section of copper between the negative electrode of the battery 10 and the ground is selected as the preset wire 20 during PCB design. When designing a PCB, according to the design requirements, select a section of copper and theoretically calculate the specific impedance. For example, if the design is required to be 5 milliohms, then select a section of copper with a theoretical impedance of 5 milliohms.

As shown in FIGS. 3 and 4 , the charging chip 30 can output the input voltage VBUS and the input current IBUS in different charging stages to the power management chip 40 in real time. The power management chip 40 determines the output power of the charging chip according to the charging efficiency, input voltage VBUS and input current IBUS, and transfers the output power of the charging chip to the processor 50 . The processor 50 calculates the output current IOUT of the charging chip 30 based on the output power and the output voltage VOUT of the charging chip 30 . Calculate the calibration parameter α based on the output current IOUT and system consumption current for power accuracy compensation. The power management chip 40 has a fuel gauge function, and the pin connected to the copper skin of the sampling resistor has an ADC function and can accurately perform analog-to-digital conversion. Connect both ends of the selected copper skin to the input terminals of the fuel gauge in the power management chip 40 respectively. When current flows, the voltages sampled at both ends of the copper skin are V1 and V2 respectively. V1 is a high voltage and V2 is a low voltage.

In one embodiment, the predetermined wire may be connected to the negative electrode or negative electrode of the battery in series with a resistor. It should be noted that in some cases, the copper skin used as the preset wire is short and has small impedance, which cannot meet the system impedance requirements. For example, a 5 milliohm resistance is required, but the actual copper skin impedance is only 2-3 milliohms. Oh, at this time, an external sampling resistor needs to be added to form a method of copper skin plus sampling resistor.

For example, as shown in FIG. 5 , the preset wire 20 is connected to the positive electrode of the battery 10 . When designing the PCB, a section of copper between the charging chip 30 and the positive electrode of the battery 10 is selected as the preset wire 20 . The preset wire 20 is connected to the positive electrode of the battery 10 . Resistor 60 in series. For example, as shown in Figure 6, if the preset wire 20 set as the sampling resistor is connected to the negative electrode of the battery 10, then a section of copper between the negative electrode of the battery 10 and the ground is selected as the preset wire 20 during PCB design. The preset wire 20 and the resistor 60 are connected in series. As shown in FIG. 5 and FIG. 6 , the fuel gauge in the power management chip 40 is connected to both ends of the preset wire 20 and the resistor 60 connected in series to collect the voltage of the preset wire 20 and the resistor 60 . When calibrating the resistance value of the preset wire 20 shown in FIG. 5 and FIG. 6 , the resistance value calibration method provided by the embodiment of the present application can also be referred to, and the influence of the resistance value R of the resistor 60 can also be considered.

The resistance value calibration method provided by the above embodiments obtains the current value of the preset conductor and obtains the voltage value of the preset conductor, wherein the preset conductor is connected to the battery; the preset conductor is determined according to the current value and voltage value. The target resistance value; based on the target resistance value, the resistance value of the preset wire is calibrated, and the resistance value of the preset wire is used to measure the change in battery power. The embodiment of the present invention uses the preset wire as the sampling resistor of the battery, which occupies a smaller area and has better heat dissipation performance, so it has less impact on the sampling accuracy. At the same time, calibrating the resistance value of the preset wire through the target resistance value can greatly improve the detection accuracy of battery power changes.

Please refer to FIG. 7 , which is a schematic structural block diagram of a calibration circuit provided by an embodiment of the present invention.

As shown in Figure 7, the calibration circuit 200 includes a preset wire 201 and a processor 202; the preset wire 201 is used to connect the battery, and the resistance value of the preset wire 201 is used to measure the change in battery power; the processor 202 is used to perform the following: The resistance value calibration method of any embodiment of the present application.

Specifically, the processor 202 is used to provide computing and control capabilities to support the operation of the entire terminal device. The processor 202 may be a central processing unit (Central Processing Unit, CPU). The processor 202 may also be another general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC). ), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general processor may be a microprocessor or the processor may be any conventional processor.

In one embodiment, the calibration circuit 200 may refer to the circuit structure of FIGS. 4 to 6 . For example, the calibration circuit 200 also includes a charging chip, a power management chip, etc., which is not specifically limited in this embodiment.

In one embodiment, the processor is used to implement the following steps:

Obtain the current value of the preset wire, and obtain the voltage value of the preset wire, wherein the preset wire is connected to the battery;

Determine the target resistance value of the preset wire according to the current value and the voltage value;

Based on the target resistance value, the resistance value of the preset wire is calibrated, and the resistance value of the preset wire is used to measure the change in power of the battery.

In one embodiment, when obtaining the current value of the preset wire, the processor is configured to:

Obtain multiple charging currents or multiple discharging currents of the battery;

Determine the average value of the multiple charging currents or the multiple discharging currents to obtain an average current value, which is used as the current value of the preset wire.

In one embodiment, when acquiring multiple charging currents of the battery, the processor is configured to:

Obtain the output power of the charging chip and obtain the output voltage of the charging chip, wherein the charging chip is connected to the battery;

Determine the output current of the charging chip according to the output power and output voltage of the charging chip;

The charging current of the battery is determined based on the output current of the charging chip and the preset consumption current.

In one embodiment, when obtaining the output power of the charging chip, the processor is used to implement:

Obtain the input voltage and input current of the charging chip, and determine the power conversion efficiency of the charging chip;

The output power of the charging chip is determined according to the input voltage, the input current and the power conversion efficiency.

In one embodiment, when determining the charging current of the battery based on the output current of the charging chip and the preset consumption current, the processor is configured to:

Determine the current operating mode of the circuit system including the charging chip, and obtain the preset consumption current corresponding to the current operating mode;

The charging current of the battery is determined based on the difference between the output current of the charging chip and the preset consumption current.

In one embodiment, one end of the preset wire is connected to the negative electrode of the battery, and the other end is grounded; or

One end of the preset wire is connected to the positive electrode of the battery, and the other end is connected to the charging chip; or

One end of the preset wire is connected to the positive electrode of the battery, and the other end is connected to the discharge chip.

In one embodiment, the preset wires include circuit wires on a PCB.

In one embodiment, when obtaining the voltage value of the preset wire, the processor is configured to:

Read the voltage at both ends of the preset wire to obtain the first voltage and the second voltage;

determining a voltage difference between the first voltage and the second voltage;

The voltage value of the preset wire is determined according to the voltage difference.

In one embodiment, the first voltage and the second voltage are read through a fuel gauge built into the power management chip.

In one embodiment, when calibrating the resistance value of the preset wire based on the target resistance value, the processor is configured to:

Obtain the reference resistance value of the preset wire;

Determine the calibration parameter of the resistance value of the preset wire according to the target resistance value and the reference resistance value;

The resistance value of the preset wire is calibrated through the calibration parameter and the reference resistance value.

In one embodiment, when determining the calibration parameter of the resistance value of the preset wire according to the target resistance value and the reference resistance value, the processor is configured to:

Determine the ratio of the target resistance value to the reference resistance value;

Use the ratio as a calibration parameter for the resistance value of the preset wire;

Calibrating the resistance value of the preset wire through the calibration parameter and the reference resistance value includes:

A product value between the calibration parameter and the reference resistance value is determined, and the resistance value of the preset wire is adjusted to the product value.

It should be noted that those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described calibration circuit 200 can be referred to the corresponding process in the aforementioned resistance value calibration method embodiment. Herein No longer.

Please refer to FIG. 8 , which is a schematic structural block diagram of a terminal device according to an embodiment of the present invention.

As shown in FIG. 8 , the terminal device 300 includes a battery 301 and a calibration circuit 302 . The battery 301 is connected to a preset wire in the calibration circuit 302 . Among them, the resistance value of the preset wire is used to measure the change in power of the battery 301. The preset wire includes a circuit wire on the PCB board. The preset wire may be the preset wire in the aforementioned embodiment.

In one embodiment, the calibration circuit 302 may be the calibration circuit 200 in FIG. 6 .

In one embodiment, the terminal device 300 further includes a memory, which is connected to the processor in the calibration circuit 302 through a bus 303, such as an I2C (Inter-integrated Circuit) bus. Specifically, the memory 302 may be a Flash chip, a read-only memory (ROM, Read-Only Memory) disk, an optical disk, a USB disk, a mobile hard disk, or the like.

Those skilled in the art can understand that the structure shown in Figure 8 is only a block diagram of a partial structure related to the embodiment of the present invention, and does not constitute a limitation on the terminal device 300 to which the embodiment of the present invention is applied. Specifically, The terminal device 300 may include more or fewer components than shown in the figures, or combine certain components, or have a different arrangement of components.

It should be noted that those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the terminal device 300 described above can be referred to the corresponding process in the aforementioned resistance value calibration method embodiment. Herein No longer.

Embodiments of the present invention also provide a storage medium for computer-readable storage. The storage medium stores one or more programs. The one or more programs can be executed by one or more processors to implement the following: The steps of any resistance value calibration method provided by the embodiments of the present invention.

The storage medium may be an internal storage unit of the terminal device described in the previous embodiment, such as a hard disk or memory of the terminal device. The storage medium may also be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SD) card, or a flash memory equipped on the terminal device. Flash Card, etc.

Those of ordinary skill in the art can understand that all or some steps, systems, and functional modules/units in the devices disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may consist of several physical components. Components execute cooperatively. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes volatile and nonvolatile media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. removable, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, magnetic cassettes, tapes, disk storage or other magnetic storage devices, or may Any other medium used to store the desired information and that can be accessed by a computer. Additionally, it is known to those of ordinary skill in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The above serial numbers of the embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of various equivalent methods within the technical scope disclosed in the present invention. Modifications or substitutions shall be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (14)

1. A method for calibrating a resistance value, comprising:

acquiring a current value of a preset wire and a voltage value of the preset wire, wherein the preset wire is connected to a battery;

determining a target resistance value of the preset wire according to the current value and the voltage value;

and calibrating the resistance value of the preset wire based on the target resistance value, wherein the resistance value of the preset wire is used for measuring and calculating the electric quantity change of the battery.

2. The method for calibrating a resistance value according to claim 1, wherein the step of obtaining the current value of the preset wire comprises:

acquiring a plurality of charging currents or a plurality of discharging currents of the battery;

and determining the average value of the charging currents or the discharging currents to obtain an average current value, wherein the average current value is used as the current value of the preset wire.

3. The method of calibrating a resistance value according to claim 2, wherein the obtaining a plurality of charging currents of the battery includes:

obtaining output power of a charging chip and obtaining output voltage of the charging chip, wherein the charging chip is connected with the battery;

determining the output current of the charging chip according to the output power and the output voltage of the charging chip;

and determining the charging current of the battery according to the output current of the charging chip and the preset consumption current.

4. The method for calibrating a resistance value according to claim 3, wherein the obtaining the output power of the charging chip comprises:

acquiring input voltage and input current of the charging chip, and determining electric energy conversion efficiency of the charging chip;

and determining the output power of the charging chip according to the input voltage, the input current and the electric energy conversion efficiency.

5. The method of calibrating a resistance value according to claim 3, wherein the determining the charging current of the battery according to the output current of the charging chip and a preset consumption current includes:

determining a current operation mode of a circuit system comprising the charging chip, and acquiring a preset consumption current corresponding to the current operation mode;

and determining the charging current of the battery according to the difference value between the output current of the charging chip and the preset consumption current.

6. The method for calibrating a resistance value according to claim 1, wherein,

one end of the preset lead is connected to the negative electrode of the battery, and the other end of the preset lead is grounded; or alternatively

One end of the preset wire is connected with the anode of the battery, and the other end of the preset wire is connected with the charging chip; or alternatively

One end of the preset wire is connected to the positive electrode of the battery, and the other end of the preset wire is connected to the discharge chip.

7. The method of claim 1, wherein the predetermined conductors comprise circuit conductors on a PCB.

8. The method for calibrating a resistance value according to any one of claims 1 to 7, wherein the acquiring the voltage value of the preset wire includes:

reading the voltages at two ends of the preset wire to obtain a first voltage and a second voltage;

determining a voltage difference between the first voltage and the second voltage;

and determining the voltage value of the preset wire according to the voltage difference value.

9. The method of calibrating a resistance value according to claim 8, wherein the first voltage and the second voltage are read by an electricity meter built in a power management chip.

10. The resistance value calibration method according to any one of claims 1 to 7, characterized in that the calibrating the resistance value of the preset wire based on the target resistance value includes:

acquiring a reference resistance value of the preset wire;

determining a calibration parameter of the resistance value of the preset wire according to the target resistance value and the reference resistance value;

and calibrating the resistance value of the preset wire through the calibration parameter and the reference resistance value.

11. The method according to claim 10, wherein determining the calibration parameter of the resistance value of the preset wire according to the target resistance value and the reference resistance value comprises:

determining a ratio of the target resistance value to the reference resistance value;

taking the ratio as a calibration parameter of the resistance value of the preset wire;

and calibrating the resistance value of the preset wire by the calibration parameter and the reference resistance value, including:

and determining a product value between the calibration parameter and the reference resistance value, and adjusting the resistance value of the preset wire to be the product value.

12. A calibration circuit, wherein the calibration circuit comprises a preset wire and a processor; the preset lead is used for connecting a battery, and the resistance value of the preset lead is used for measuring and calculating the electric quantity change of the battery; the processor is configured to perform the resistance value calibration method according to any one of claims 1 to 11.

13. A terminal device comprising a battery and a calibration circuit according to claim 12, the battery being connected to a predetermined wire in the calibration circuit.

14. A storage medium for computer-readable storage, characterized in that the storage medium stores one or more programs executable by one or more processors to implement the resistance value calibration method of any one of claims 1 to 11.