WO2020155068A1

WO2020155068A1 - Current measuring device, method, and apparatus

Info

Publication number: WO2020155068A1
Application number: PCT/CN2019/074295
Authority: WO
Inventors: 胡章荣
Original assignee: 华为技术有限公司
Priority date: 2019-01-31
Filing date: 2019-01-31
Publication date: 2020-08-06
Also published as: CN111771129B; CN111771129A

Abstract

Embodiments of the present application disclose a current measuring device, a method, and an apparatus. The current measuring device comprises: multiple resistors in series, switching units, and a coulombmeter. The multiple resistors in series are on a discharging circuit of a battery, and at least one first resistor of the multiple resistors in series has a value different from that of a second resistor. The switching units are used to switch a coupling configuration between the coulombmeter and the multiple resistors in series so as to form various coupling modes. In any of the coupling modes, at least one target measurement resistor of the multiple resistors in series is coupled to the coulombmeter, and the coulombmeter uses at least one target measurement resistor to measure a current value of the discharging circuit in any of the coupling modes. The technical solution provided by the embodiments of the present application enables the coulombmeter to be coupled to resistors having different resistance values by means of the switching units, and increases a current measuring range of the coulombmeter by performing a measurement by means of resistors having different resistance values.

Description

Device, method and equipment for measuring current

Technical field

The embodiments of the present application relate to the field of electronic technology, and in particular, to a device, method, and device for measuring current.

Background technique

Terminal devices such as mobile phones, tablet computers, and notebook computers have the function of displaying the remaining battery power. The remaining battery power is usually calculated and determined based on the current on the battery discharge path measured by the coulomb meter in the terminal device. In the prior art, when the coulometer measures current, it first measures the voltage across the precision resistor connected in the battery discharge path, and then divides the measured voltage value by the resistance value of the precision resistor to obtain the current value in the battery discharge path . It should be noted that under the rated accuracy, the coulomb counter can usually only measure the voltage within a fixed range. When the resistance of the precision resistor is fixed, the current range that the coulomb counter can measure is also fixed. For example, if the coulomb counter is at the rated The current measurement range corresponding to the accuracy is (I _min , I _max ), then I _min is the lower limit of the coulomb counter that can accurately measure the current, and I _max is the upper limit of the coulomb counter that can accurately measure the current. For less than I _min or The current coulomb counter greater than I _max will be inaccurate.

Under the rated accuracy, if the measuring range of the coulomb counter can be expanded (for example, if the current value in a smaller battery discharge path and/or a larger current value in the battery discharge path can be measured), it can be improved The calculation accuracy of the remaining power of the battery enables the user to know the remaining power value of the battery more accurately. In the prior art, in order to expand the current measurement range of the coulomb meter, the method adopted is to replace the coulomb meter with a larger measurement range. Increase the cost of measuring current. Therefore, how to provide a low-cost technology for expanding the measuring range of the coulomb counter becomes a problem.

Summary of the invention

The embodiments of the present application provide a device, method, and equipment for measuring current, so as to reduce the cost on the basis of expanding the current measurement range.

In the first aspect, an embodiment of the present application provides a device for measuring current, including: a plurality of series resistors, a switching unit, and a coulomb counter; the plurality of series resistors are located on the discharge path of the battery, and the plurality The value of at least one first resistance in the series resistance is different from the value of the second resistance; the switching unit is used to switch the coupling relationship between the coulomb counter and the plurality of series resistances to form multiple coupling modes; In a coupling mode, at least one measurement target resistance of the plurality of series resistors is coupled to the coulomb counter; the coulomb counter is used to measure the discharge using the at least one measurement target resistance in any coupling mode The current value on the path.

In the device for measuring current provided by the embodiment of the application, a plurality of resistors connected in series are arranged on the discharge path of the battery, and at least two measurement target resistors with different resistance values can be obtained through the switching unit. When the target resistance is measured, the current measurement ranges corresponding to the measurement target resistances of different resistance values are different. Compared with the measurement of only one resistance in the prior art and corresponding to a fixed current measurement range, the embodiments of the present application have It is helpful to expand the measuring range of the coulomb meter when measuring current. In addition, compared to replacing the coulomb counter to expand the current measurement range, the embodiment of the present application implements the expansion of the current measurement range of the coulomb counter by measuring measurement target resistances with different resistance values, thereby saving costs.

In some possible embodiments, the at least one first resistor includes a third resistor and a fourth resistor, and the value of the third resistor is different from the value of the fourth resistor.

In the embodiment of the present application, resistors with different resistance values are set in the first resistor, which is beneficial to further expand the current measurement range of the coulomb counter.

In some possible embodiments, the value of the third resistor is greater than the value of the second resistor, and the value of the fourth resistor is less than the value of the second resistor. When the coulomb counter measures the third resistance, it can measure a smaller current value than when the second resistance is measured. When the coulomb counter measures the fourth resistance, it can detect that it is more current than when the second resistance is measured. A large current value, therefore, compared to the current measurement range corresponding to the second resistor, the adoption of this embodiment is beneficial to expand the current measurement range.

In some possible embodiments, any one of the at least one first resistance includes a parasitic resistance. The parasitic resistance can be provided by traces, wires, or connectors. Since the parasitic resistance does not need to be purchased or designed separately, this embodiment can expand the current measurement range of the coulomb counter without increasing the cost.

In some possible embodiments, the at least one measurement target resistance includes any one of the at least one first resistance or the first resistance.

In some possible embodiments, the at least one measurement target resistance includes a combination of any one of the at least one first resistance and the second resistance.

The foregoing embodiment obtains a coupling mode including different resistances through the switching unit, which is beneficial to expand the different current detection range of the coulomb counter.

In the second aspect, an embodiment of the present application provides a device for measuring current, including: the device and the processor according to the first aspect or any possible implementation manner of the first aspect; the processor is used to control The switching unit switches the coupling relationship between the coulomb counter and the plurality of series resistors.

In some possible embodiments, the processor is further configured to obtain a current value corresponding to each of the multiple coupling modes from the device.

In some possible embodiments, the processor is further configured to calibrate the current value corresponding to at least one coupling mode.

It should be noted that the resistance of parasitic resistance and ordinary resistance will change with factors such as temperature or circuit aging. The processor calibrates the current value obtained by at least one coupling method, which is beneficial to discharge the measured battery. The current value on the path is more accurate.

In some possible embodiments, the multiple coupling modes include a first coupling mode and a second coupling mode; in the first coupling mode, the at least one measurement target resistance has a first resistance value, and the first The current value corresponding to the coupling mode is the first current value; in the second coupling mode, the at least one measurement target resistance has a second resistance value, the first resistance value is smaller than the second resistance value, and the The current value corresponding to the second coupling mode is the second current value; the processor is further configured to, when it is determined that the first current value is less than or equal to the first threshold, use the calibration parameters to calibrate the second current value to obtain the measurement result.

In some possible embodiments, the processor is further configured to use the first current value as a measurement result when it is determined that the first current value is greater than the first threshold value.

In some possible embodiments, the processor is further configured to modify the calibration parameter when it is determined that the first current value is greater than the first threshold value and the second current value is less than the second threshold value. The second threshold is greater than the first threshold.

In some possible embodiments, the multiple coupling modes include a third coupling mode and a fourth coupling mode; in the third coupling mode, the at least one measurement target resistance has a third resistance value, and the third coupling mode The current value corresponding to the coupling mode is the third current value; in the fourth coupling mode, the at least one measurement target resistance has a fourth resistance value, the third resistance value is greater than the fourth resistance value, and the The current value corresponding to the fourth coupling mode is the fourth current value; the processor is further configured to, when it is determined that the third current value is greater than or equal to the second threshold value, use the calibration parameters to calibrate the fourth current value to obtain the measurement result.

In some possible embodiments, the processor is further configured to use the third current value as a measurement result when it is determined that the third current value is less than the second threshold value.

In some possible embodiments, the processor is further configured to modify the calibration parameter when it is determined that the third current value is less than the second threshold value and the fourth current value is greater than the first threshold value. The second threshold is greater than the first threshold.

In the third aspect, an embodiment of the present application provides a method for measuring current, which is applied to a device for measuring current including a plurality of series resistors, a switching unit, a coulomb counter, and a processor; wherein the multiple A series resistor is located on the discharge path of the battery, and the value of at least one first resistor of the plurality of series resistors is different from the value of the second resistor; the method includes: the processor controls the switching unit to switch the The coupling relationship between the coulomb counter and the plurality of series resistances; to form a plurality of coupling modes; in any coupling mode, at least one measurement target resistance of the plurality of series resistances is coupled to the coulomb counter; The processor acquires the current value of the discharge path by the coulomb counter using the at least one measurement target resistance in any coupling mode.

In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and the computer program includes program instructions that, when executed by a processor, cause all The processor executes the method as described in the third aspect.

In the fifth aspect, the embodiments of the present application provide a computer program product, the computer program product includes a computer-readable storage medium storing a computer program, the computer program causes a computer to execute part or part of the method described in the third aspect All steps.

Description of the drawings

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

Fig. 1A is a schematic structural diagram of a device for measuring current provided by an embodiment of the present application.

Fig. 1B is a schematic diagram of the control flow of the device for measuring current in Fig. 1A when measuring current.

FIG. 1C is a schematic structural diagram of a device for measuring current provided by another embodiment of the present application.

Fig. 2A is a schematic structural diagram of a device for measuring current provided by another embodiment of the present application.

Fig. 2B is a schematic diagram of the control flow when the device for measuring current in Fig. 2A measures current.

FIG. 3 is a schematic diagram of the control flow when the device for measuring current in another embodiment corresponding to FIG. 1A measures current.

Fig. 4 is a schematic structural diagram of a device for measuring current provided by another embodiment of the present application.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that the terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and/or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

It should be noted that the embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and cannot be construed as limiting the present invention.

A number of different embodiments are provided below to illustrate different structures for implementing the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. In addition, the present invention may repeat reference numbers and/or letters in different examples. This repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and/or settings discussed.

In order to expand the current detection range of the coulomb counter, the inventor of the present application provides a device for measuring current. The device can expand the current measurement range of the coulomb counter. The coulomb counter does not need to be replaced during implementation. The discharge path of the measuring battery is connected in series. The current value corresponding to the multiple resistances can be realized. The implementation principle of the technical solution provided by this application is: in the case of a traditional fixed resistance, if the current detection range within the rated accuracy of the coulomb counter is (I _min , I _max ), this embodiment measures the resistance of a resistor with a larger resistance value. Voltage, a current value smaller than I _min can be obtained. Alternatively, by measuring the voltage of a resistor with a smaller resistance value, a current value larger than I _max can be obtained. Compared with the replacement of the coulomb counter in the prior art to expand the current range of the coulomb counter, the cost is saved. In specific implementation, the resistance measured by the coulomb counter may include: parasitic resistance generated by wires, traces or electronic components, or ordinary resistance, Or precision resistance, etc. Parasitic resistance provided by wires, traces or electronic components does not require additional purchase or design, which can reduce costs.

It should be noted that when the precision resistance is measured, the current value obtained by the measurement is more accurate due to its relatively stable performance. The resistance value of parasitic resistance and ordinary resistance will fluctuate greatly with temperature or the aging of related electronic components. In order to obtain accurate current value, in some possible embodiments, precision resistance and parasitic resistance or ordinary resistance can be used. The relationship calibrates the measured current value. This will be further introduced below.

For ease of understanding, the embodiments of the present application will be described below with reference to the accompanying drawings. Please refer to FIG. 1A. FIG. 1A is a device 100 for measuring current, including: a device 110 for measuring current, a battery 120, and a processor 130. The device 110 for measuring current includes: a first resistor 114 and a second resistor 113 connected in series, a switching unit 112 and a coulomb counter 111 located on the discharge path of the battery 120. The device may include, but is not limited to, a terminal device, such as a mobile phone, a tablet computer, or a notebook computer with a remaining power display function. In some possible implementation manners of the present application, the terminal device may include a display screen, and the remaining power of the battery or the length of time that the terminal device corresponding to the remaining power can continue to be used can be displayed on the display screen. The switching unit 112 may include two switches, each of which may be a single-pole double-throw switch. Each fixed end of a single-pole double-throw switch is connected to one end of a resistor, and the other end of each resistor is respectively connected to a fixed end of another single-pole double-throw switch. In some possible implementations, two The switches can all perform switching operations, so that there is only one resistance coupled with the coulomb counter 111 each time. For example, if the moving ends of the two SPDT switches in Figure 1A are switched to the left fixed ends, the coulomb counter 111 and The resistance R _{1 is} coupled; if the moving ends of the two single-pole double-throw switches are switched to the right non-moving ends, the coulomb counter 111 is coupled to the resistance R ₂ .

In FIG. 1A, a first resistor 114 comprises a resistance value R ₁ of the resistor, a second resistor 113 comprises a resistance value of the resistor R _O, R _O different resistance and resistance R _1, and R _1> R _o . In this embodiment, assuming the second resistor 113 a resistance R _o is a precision resistor, a first resistor 114 in resistor R ₁ is general resistance or parasitic resistance. The switching unit 112 is used to switch the coupling relationship between the coulomb counter 111 and the resistance R _o and the resistance R ₁ to form a variety of coupling modes. As shown in FIG. 1A, the switching unit 112 can be switched with the resistance R ₁ through the switching unit 112. Or any one of the resistors _Ro is connected in parallel, that is, two coupling modes are generated by the switching unit 112. In one coupling mode, the measurement target resistance is R ₁ , and in the other coupling mode, the measurement target resistance is _Ro . The coulometer measures the current value flowing through R ₁ and the current value flowing through R _o respectively. The processor 130 is configured to control the switching unit 112 to switch, and receive the current value measured by the coulomb counter 111 in any coupling mode. The processor 130 can further perform current calibration and obtain the final measurement result. The final measurement result can be the current value measured by the coulomb counter 111 in one of the coupling modes, or the current value measured by the coulomb counter 111 in one or more coupling modes. One or more current values measured by the meter 111 are calibrated.

Assuming that under the rated accuracy of the traditional coulomb counter, the current detection range when measuring the precision resistance _Ro is (I _min , I _max ), the control flow chart of the device in FIG. 1A for current detection is shown in FIG. 1B in this embodiment. As shown, the process includes the following steps: 141. The processor 130 triggers the start of the current sampling period. For example, the coulomb counter can sample each measurement target resistance every 500 milliseconds. Take the circuit corresponding to Figure 1A as an example. In each sampling period, the coulomb counter measures the current flowing through R _{1 and} the current flowing through R _o的current. 142, the processor 130 acquires the flow through coulometer measurement precision resistor R _O current I _o, and acquiring coulomb flowing through the parasitic resistance R measured current I ₁ _1.

143. The processor 130 determines whether I _o is greater than I _min . If I _o >I _min , then step 144 is executed, and if I _{o is} not greater than I _min , step 147 is executed. The processor 130 determines whether I ₁ is less than I _max . If I ₁ <I _max , then perform step 145. If I _{1 is} not less than I _max , then perform step 146. 145. The processor 130 corrects the calibration coefficient K ₁ , K ₁ =K _1n =f(K _{1(n-1 )} , I ₁ /I _o ). In some possible embodiments, f is a smooth change in K _i that the low pass filtering function. In some possible embodiments of the present application, the battery discharge plurality of resistors connected in series on the path comprising a resistor R _o is greater than the resistance values, the processor 130 is greater than the resistance value of each resistor R _o are provided a calibration factor, The initial value of the calibration coefficient K _(i-1 ) corresponding to the resistance R _(i-1) ) K _(i-1) = R _(i-1) /R _(i-2) , the i is an integer, 1≤ i≤a. In any sampling period, if the I _min ≤I _i ≤I _max and _{_{I min ≤I (i-1)}} ≤I max, K _i is the calibration coefficient of resistance R _i is corrected, the corrected K _i = f ( K _i before correction, I _(i-1) /I _(i-2) ); where the f is a low-pass filter function that smoothly changes K _(i-1) , if the current corresponding to the resistance R _i is I _i , the current corresponding to the resistance R (i-1) is I _(i-1) , and the current corresponding to the resistance R _(i-2) is I _(i-2) ; in the current sampling period, if I _{(i- 2)} <I _min and I _(i-1) > I _min , the current I _(i-1) / (K _(i-1) × K _{(i- 2)} ×…×K ₁ ). For example, in some possible implementations, K _i =f=K _(i-1) ×θ+(I _i /I _(i-1) )×(1-θ), where θ is the filter constant , The selection range is 0<θ<1, for example, you can choose θ=0.6 or θ=0.8, etc., which can be corrected according to the actual measurement effect.

146, the processor 130 set I = I _o. 147. The processor 130 sets I=I ₁ /K ₁ . 148. The processor 130 determines that the current on the battery discharge path is I, which is the final current detection result. Further, the processor 130 may determine the remaining power of the battery 120 according to the current I on the battery discharge path, and may also estimate the length of time that the device 100 for current measurement corresponding to the remaining power can continue to be used.

In the device for measuring current provided by the embodiments of the present application, R _{1 is} greater than _Ro , if the current I _o obtained by measuring the precision resistance in the current sampling period is within (I _min , I _max ), then I _{o is taken} as the current sample Current I in the discharge path of the cycle battery. If I _o <I _min, then the current of the current sampling period measured resistances R ₁ is calibrated, the calibrated value of current as the current sampling period current I flowing through the battery discharge path, since the current I _min can be less than It is obtained by calibrating I ₁ , so this embodiment is used to expand the range of the current measured by the coulometer.

In some possible implementation manners of the present application, the coupling relationship between the coulomb counter 111 and each resistance can be changed by the switching unit 112. In the embodiment shown in FIG. 1C, the coulomb counter 111 is used for resistances including R _o and R _{1 respectively} . 115 comprises a resistor 113 and R _o was measured. At this time, different from FIG. 1A, the switching unit 112 includes a switch, which may be a single pole double throw switch connected to one end of resistor R _o coulomb counter 111, without going through the switch, the other end of the resistor R _o and the SPDT One fixed end of the switch is connected to one end of R ₁ , and the other end of R ₁ is connected to the other fixed end of the SPDT switch. When the moving end of the SPDT switch is switched to the left fixed end, the coulomb counter 111 is coupled with the resistance (R ₁ +R _o ). When the moving end of the single-pole double-throw switch is switched to the fixed end on the right, the coulomb counter 111 is coupled with the resistance _Ro .

In some possible implementations of the present application, for the device 100 for measuring current shown in FIG. 1A, if R ₁ <R _o , the coulometer can measure a current larger than I _max . The corresponding control flow implementation is shown in FIG. 3, which includes the following steps: 341. The processor 130 triggers the start of the current sampling period. For example, the coulomb counter can sample each measurement target resistance every 500 milliseconds. Take the circuit in Figure 1A as an example. In each sampling period, the coulomb counter measures the current flowing through R1 and the current flowing through Ro. . 342, the processor 130 acquires coulometer measurement precision resistor R _O flowing current I _o, and acquiring coulomb measured current flowing through the parasitic resistance R I _{₁ 1} a.

343. The processor 130 determines whether I _o is less than I _max . If I _o <I _max , then perform step 344, if I _{o is} not greater than I _max , then perform step 347. 344, determine whether I ₁ is greater than I _min . If I ₁ >I _min , go to step 345, and if I _{1 is} not greater than I _min , go to step 346. 345, the processor 130 corrects the calibration coefficient K ₁ , K ₁ =K _1n =f(K _{1(n-1 )} , I ₁ /I _o ). f is a low-pass filter function, and the process of correcting the calibration coefficient K ₁ can refer to the introduction of the previous embodiment.

346, the processor 130 set I = I _o. 347. The processor 130 sets I=I ₁ ×K ₁ . 348. The processor 130 determines that the current on the battery discharge path is I. Further, the processor 130 may determine the remaining power of the battery 120 according to the current I on the battery discharge path, and may also estimate the length of time that the device 100 for current measurement corresponding to the remaining power can continue to be used.

In the device for measuring current provided by the embodiment of the application, R _{1 is} less than R _o . If the current I _o obtained by measuring the precision resistance in the current sampling period is within (I _min , I _max ), then I _{o is taken} as the current sample Current I in the discharge path of the cycle battery. If I _o ≥ I _max , calibrate the current measured by the resistance R ₁ in the current sampling period, and use the calibrated current value as the current I flowing through the battery discharge path in the current sampling period. Since the current greater than I _max can be It is obtained by calibrating I ₁ , so this embodiment is used to expand the range of the current measured by the coulometer.

Please refer to FIG. 2A. FIG. 2A is a schematic structural diagram of a device 200 for measuring current. The device 200 for measuring current includes a device 210 for measuring current, a battery 220, and a processor 230. This embodiment is used to expand the current measurement range of the coulomb counter. In this embodiment, the apparatus 210 for measuring current comprising: a coulomb counter 211, the switching unit 212, branch 213 and precision resistor 214 and the

parasitic resistances

215, 213 are precision resistors of resistance R _o, the parasitic resistance of the resistor 214 is R ₁ , the resistance of the parasitic resistance 215 is R ₂ . R ₂ >R ₁ >R _o , the precision resistance branch 213 and the

parasitic resistances

214 and 215 are connected in series in the battery discharge path. Different from FIG. 1A, the two switches in the switching unit 212 in FIG. 2A become single-pole three-throw switches to realize the switching between the precision resistance branch 213 and the

parasitic resistances

214 and 215.

When the device 200 for detecting current is measuring current, the control process shown in FIG. 2B may be used. Specifically, it includes the following steps: 241. The processor 130 triggers the start of the current sampling period. In each sampling period, the coulometer measures the currents flowing through R ₁ , R ₂ , and _Ro respectively. 242, the processor 130 acquires coulometer measurement precision resistor R _O flowing current I _o, acquiring coulomb flowing through the parasitic resistance R measured current I ₁ _1, and acquiring coulomb flowing through the parasitic resistance R measured current I ₁ of ₁ .

243. The processor 130 determines whether I _o is greater than I _min . When the coulometer current measuring precision resistor R _o, the accuracy of the current at nominal measurement range (I _min, I _max). If I _o > I _min , then step 244 is executed. If I _{o is} not greater than I _min , then step 248 is executed. 244. The processor 130 determines whether I ₁ is less than I _max . If yes, go to step 245, if not, go to step 246.245, the processor 130 corrects the calibration coefficient K ₁ , K ₁ =K _1n =f(K _1(n-1) , I ₁ /I _o ), refer to Described before.

246. The processor 130 sets I=I _o . 248. The processor 130 determines whether I ₁ is greater than I _min . If I ₁ >I _min , then step 2481 is executed, and if I _{1 is} not greater than I _min , step 2484 is executed. The processor 130 sets I=I ₂ /(K ₁ ×K ₂ ). 2481. The processor 130 determines whether I ₂ is less than I _max . If I ₂ <I _max , then perform step 2482, and if I _{1 is} not less than I _max , then perform step 2483. 2482. The processor 130 corrects the calibration coefficient K ₂ . K ₂ =K _2m =f(K _2(m-1) , I ₂ /I ₁ ), where f is a low-pass filter function.

2483. The processor 130 sets I=I ₁ /K ₁ where. 247. The processor 130 determines that the current on the battery discharge channel is I, which is the final determined result. Specifically, the processor 230 can determine the remaining power of the battery 220 according to the current I of the battery discharge path, and can also estimate the duration that the device 200 corresponding to the remaining power can continue to be used. The device for measuring current provided by the embodiment of the present application is provided with a precision resistor, and resistors R1 and R2 that are larger than the precision resistor. By measuring different resistors, it is possible to detect a small current.

In some possible implementations, the discharge path of the battery may be the main circuit of the system that receives the discharge. If the resistor connected in series in the main circuit of the battery includes multiple resistors with a resistance greater than the precision resistor _Ro , for example, if there is a resistor resistance Ro of greater than, or equal to a is an integer greater than 1 to 1, is greater than the resistance value of the resistance of the descending precision resistors of a resistor of the order _{_{of: R a, R (a-}} 1), ..., R 1 , Then R _{i is} greater than R _(i-1) and (R _i /R _(i-1) ) is at least less than (I _max /I _min ), the i is an integer, and 1≤i≤a. Take the embodiment shown in FIG. 2A as an example, where a=2, R ₂ >R ₁ >R _o , and (R ₂ /R ₁ ) is at least less than (I _max /I _min ).

In the above embodiment, the multiple resistors set in the device for measuring current are either larger than the precision resistance or smaller than the precision resistance. In the embodiment shown in FIG. 4, both are set larger than the precision resistance R _o the resistors R ₁ and R _2, and provided less than the precision resistor R & lt _o resistor R _{1 'and} R _2', the description of the previous embodiments can be seen, through the switching unit to switch 412, can coulomb counter 411, respectively, for R ₁ _{_{, R 2, R o, R}} 1 ' and R _2' is coupled, respectively measuring current flowing through each resistor. When the current I _o of the measurement R _o is located at (I _min , I _max ), the processor 430 sets I=I _o , and if I _o ≤ I _min , the measurement current of R ₁ or R ₂ is used for correction. If I _o ≥I _max of the _{_'2} and _R' is the measured current is corrected by R _1. For the specific calibration process, reference may be made to the description in the previous embodiment, which will not be repeated here. The basic principle of calibration is similar in each embodiment.

In some possible implementations, if the resistors connected in series in the main circuit of the battery include multiple resistors with a resistance value less than the precision resistor _Ro , for example, if there are b resistors with a resistance value less than _Ro , b is greater than 1 or equal to 1. The resistance value of the b resistors of the precision resistor branch is as follows: R _b , R _(b-1) ,..., R ₁ , then R _{j is} less than R _(j-1) , And R _(j-1) /R _{j is} at least less than (I _max /I _min ), the i is an integer, 1≤j≤b; the processor sets a calibration coefficient for each of the b resistors whose resistance value is less than the precision resistance , the initial value corresponding to the resistance R _j of the calibration factor K _j _{_{K j = R (j-1}} ) / R j, the j is an integer, 1≤j≤b; such as _{_{_{K 1 = R o / R 1}}} . In any sampling period, if I _min ≤I _j ≤I _max , I _min ≤I _(j-1) ≤I _max , then the calibration coefficient K _j of the resistance R _j is corrected, and the corrected K _j =f( K _j before correction, I _(j-1) /I _j ); where f is a low-pass filter function that smoothly changes K _j , the current corresponding to resistance R _j is I _j , and resistance R _(j-1) corresponds to The current of is I _(j-1) . In the current sampling period, if I _j ≤ I _max , then the current I _j × (K _j × K _(j-1) ×... × K ₁ ) flowing through the battery main circuit in the current sampling period.

The foregoing mainly introduces the solution of the embodiment of the present application from the perspective of the execution process on the device side. It can be understood that, in order to implement the above control process, the device includes hardware structures and/or software modules corresponding to various functions. Those skilled in the art should easily realize that the functions of the control flow performed by the processor can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

The embodiments of the present application may divide the device or device into functional units according to the above examples. For example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of each component in the embodiment of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation. For example, the above devices may be located in the same chip or a chipset including multiple chips. The device can be located on the same chip as the processor. Or, the device and the processor are located on different chips, that is, the processor is located on a separate chip. For example, when the processor is located in an independent chip, the device can be a power management unit (PMU) chip. Optionally, at least one of the plurality of series resistances and the switching unit used to perform the measurement may be located in the chip or outside the chip, that is, at least one of the plurality of series resistances and the switching unit may be a separate device located in the circuit On the board, this embodiment is not limited.

Exemplarily, the above processor may selectively run software to work. The software may be stored in a computer-readable storage medium, including a computer program in the form of the software, and the computer program includes a large amount of computer code. The processor controls the switching unit to switch the coupling relationship between the coulomb counter and the plurality of series resistors by running the computer program, and receives the current value measured by any coupling mode of the coulomb counter. The processor further determines the final measurement result from the multiple current values obtained in multiple coupling modes by running the computer program, and can also selectively calibrate the current value. For the specific calibration process, refer to the description of the previous embodiment. The processor may include, but is not limited to, a central processing unit, a microcontroller, a microprocessor, a digital signal processor, or an artificial intelligence processor.

The embodiments of the present application also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, the computer program includes program instructions, and the program instructions, when executed by a processing tool, cause the processor to execute the above-mentioned process method implementation Part or all of the steps of any process method for measuring current described in the example. The computer-readable storage medium may be a memory, which may include a flash disk, a read-only memory, a random access device, a magnetic disk or an optical disk, and the like.

The embodiments of the present application also provide a computer program product, the computer program product includes a computer-readable storage medium storing a computer program, and the computer program causes a computer to execute any of the current measurement methods described in the above-mentioned process method embodiment. Part or all of the steps of the process method.

In the foregoing embodiments, the description of each embodiment has its own focus. For a part that is not described in detail in an embodiment, reference may be made to related descriptions of other embodiments. In the several embodiments provided in this application, it should be understood that the disclosed device may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or connection may be direct connection or indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical or other forms.

What is disclosed above is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of rights of the present invention. A person of ordinary skill in the art can understand all or part of the process of implementing the foregoing embodiments and follow the rights of the present invention. The equivalent changes required are still within the scope of the invention.

Claims

A device for measuring current, which is characterized by comprising: a plurality of series resistors, a switching unit, and a coulomb counter;

The plurality of series resistors are located on the discharge path of the battery, and the value of at least one first resistor of the plurality of series resistors is different from the value of the second resistor;

The switching unit is configured to switch the coupling relationship between the coulomb counter and the plurality of series resistances to form a plurality of coupling modes; in any coupling mode, at least one of the plurality of series resistances is measured by the target resistance Coupled to the coulomb counter;

The coulomb counter is used to measure the current value on the discharge path by using the at least one measurement target resistance in any coupling mode.
The device according to claim 1, wherein the at least one first resistor includes a third resistor and a fourth resistor, and the value of the third resistor is different from the value of the fourth resistor.
3. The device according to claim 2, wherein the value of the third resistor is greater than the value of the second resistor, and the value of the fourth resistor is less than the value of the second resistor.
The device according to any one of claims 1 to 3, wherein any one of the at least one first resistance includes a parasitic resistance.
The device according to any one of claims 1 to 4, wherein the at least one measurement target resistance comprises any one of the at least one first resistance or the first resistance.
The device according to any one of claims 1 to 4, wherein the at least one measurement target resistance comprises a combination of any one of the at least one first resistance and the second resistance.
A device for measuring current, characterized by comprising the device and a processor according to any one of claims 1-6;

The processor is configured to control the switching unit to switch the coupling relationship between the coulomb counter and the plurality of series resistors.
8. The device according to claim 7, wherein the processor is further configured to obtain a current value corresponding to each of the multiple coupling modes from the device.
The device according to claim 8, wherein the processor is further configured to calibrate the current value corresponding to at least one coupling mode.
The device according to claim 9, wherein the multiple coupling modes include a first coupling mode and a second coupling mode; in the first coupling mode, the at least one measurement target resistance has a first resistance Value, the current value corresponding to the first coupling mode is the first current value; in the second coupling mode, the at least one measurement target resistance has a second resistance value, and the first resistance value is smaller than the first resistance value Two resistance values, the current value corresponding to the second coupling mode is the second current value;

The processor is further configured to, when it is determined that the first current value is less than or equal to the first threshold value, use calibration parameters to calibrate the second current value to obtain a measurement result.
The device according to claim 10, wherein the processor is further configured to use the first current value as a measurement result when it is determined that the first current value is greater than the first threshold value.
The device according to claim 10 or 11, wherein the processor is further configured to, when it is determined that the first current value is greater than the first threshold value and the second current value is less than the second threshold value, Then, the calibration parameter is corrected, and the second threshold is greater than the first threshold.
The device according to claim 9, wherein the multiple coupling modes include a third coupling mode and a fourth coupling mode; in the third coupling mode, the at least one measurement target resistance has a third resistance Value, the current value corresponding to the third coupling mode is a third current value; in the fourth coupling mode, the at least one measurement target resistance has a fourth resistance value, and the third resistance value is greater than the first Four resistance values, the current value corresponding to the fourth coupling mode is the fourth current value;

The processor is further configured to, when it is determined that the third current value is greater than or equal to a second threshold value, calibrate the fourth current value by using calibration parameters to obtain a measurement result.
The device according to claim 13, wherein the processor is further configured to use the third current value as a measurement result when it is determined that the third current value is less than the second threshold value.
The device according to claim 13 or 14, wherein the processor is further configured to: when it is determined that the third current value is less than the second threshold value and the fourth current value is greater than the first threshold value, Then, the calibration parameter is corrected, and the second threshold is greater than the first threshold.
A method for measuring current, characterized in that it is applied to a device for measuring current that includes a plurality of series resistors, a switching unit, a coulomb counter, and a processor; wherein, the plurality of series resistors are located in the battery On the discharge path, the value of at least one first resistor of the plurality of series resistors is different from the value of the second resistor; the method includes:

The processor controls the switching unit to switch the coupling relationship between the coulomb counter and the plurality of series resistances; to form a plurality of coupling modes; in any coupling mode, at least one of the plurality of series resistances The measurement target resistance is coupled to the coulomb counter;

The processor obtains the current value on the discharge path by the coulomb counter using the at least one measurement target resistance in any coupling mode.
A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program includes program instructions that, when executed by a processor, cause the processor to execute The method described in claim 16.
A computer program product, characterized in that the computer program product includes a computer-readable storage medium storing a computer program, the computer program causing a computer to execute part or all of the steps of the method according to claim 16.