Power supply circuit and power supply detection method applied to battery series connection

Abstract

The present invention discloses a power supply circuit and a power supply detection method applied to battery series connection. The power supply detection method includes: if a conduction signal is received through a switch control terminal, obtaining the no-load voltage value of the voltage detection terminal; controlling a load to be connected to two poles of the battery pack, and obtaining the working voltage value of the voltage detection terminal and the working current value of the current detection terminal; analyzing the no-load voltage value, the working voltage value and the working current value according to a preset load current analysis rule to obtain a corresponding load current; matching curve parameters of the working voltage value and the load current with a pre-stored curve database to obtain a matched curve parameter as a corresponding power measurement value. The above power supply detection method measures the no-load voltage value, the working voltage value and the working current value through a power supply controller, and performs curve parameter matching to obtain a corresponding power measurement value, which can be used for battery series connection power supply and accurately measure the battery power.

Description

Technical Field

[0001] The present invention relates to the technical field of circuits, and in particular, to a power supply circuit and a power supply detection method applied to battery series connection. Background Art

[0002] For a terminal product equipped with a battery developed based on the MTK platform (an integrated circuit device development platform), under normal circumstances, since only a single battery is used for power supply and the battery voltage is 3.8V, both the software and hardware of the terminal product are adapted to the single-battery voltage. When developing a device that requires a larger power, the single-battery voltage is insufficient in output power, resulting in problems such as fast power consumption, unstable system, and large heat generation of the terminal product. At this time, multiple batteries need to be connected in series to increase the battery pack voltage and supply power to the system. However, the software and hardware of the terminal product cannot adapt to the voltage of the battery pack and measure the battery power. Therefore, the prior art has the problem that the terminal product cannot adapt to the battery series connection power supply and perform power detection. Summary of the Invention

[0003] Embodiments of the present invention provide a power supply circuit and a power supply detection method applied to battery series connection, aiming to solve the problem in the prior art that the terminal product cannot adapt to the battery series connection power supply and perform power detection.

[0004] In a first aspect, embodiments of the present invention disclose a power supply detection method applied to battery series connection, which is used in a power supply controller of a power supply circuit applied to battery series connection. Among them, the switch control end of the power supply controller is connected to a control switch, the power supply input end of the power supply controller is connected to the positive pole of the battery pack through a buck circuit, the voltage detection end of the power supply controller is connected to the positive pole of the battery pack through an operational amplifier, and the two current detection ends of the power supply controller are respectively connected to both ends of a detection resistor. The detection resistor is serially arranged between the negative pole of the battery pack and the ground terminal; the battery pack includes a plurality of batteries connected in series. The power supply detection method includes:

[0005] If a conduction signal is received through the switch control end, obtain the no-load voltage value of the voltage detection end;

[0006] Control a load to be connected to both poles of the battery pack, and obtain the working voltage value of the voltage detection end and the working current value of the current detection end;

[0007] Analyze the no-load voltage value, the working voltage value, and the working current value according to a preset load current analysis rule to obtain the corresponding load current;

[0008] Match the curve parameters of the working voltage value and the load current with a pre-stored curve database to obtain the matched curve parameters as the corresponding power measurement value.

[0009] In a second aspect, embodiments of the present invention further disclose a power supply circuit applied to battery series connection. Among them, the power supply controller of the power supply circuit applies the power supply detection method for battery series connection as described in the first aspect above. The power supply circuit further includes an operational amplifier, a buck circuit, and a detection resistor;

[0010] The switch control end of the power supply controller is connected to one end of a control switch, and the other end of the control switch is grounded;

[0011] The power supply input end of the power supply controller is connected to the positive pole of the battery pack through a buck circuit. The voltage detection end of the power supply controller is connected to the positive pole of the battery pack through an operational amplifier. The two current detection ends of the power supply controller are respectively connected to both ends of the detection resistor. The detection resistor is serially arranged between the negative pole of the battery pack and the ground terminal; the battery pack includes a plurality of batteries connected in series.

[0012] Embodiments of the present application disclose a power supply circuit and a power supply detection method applied to battery series connection. The power supply detection method includes: if a conduction signal is received through the switch control end, obtaining the no-load voltage value of the voltage detection end; controlling a load to be connected to both poles of the battery pack, and obtaining the working voltage value of the voltage detection end and the working current value of the current detection end; analyzing the no-load voltage value, the working voltage value, and the working current value according to a preset load current analysis rule to obtain a corresponding load current; performing curve parameter matching on the working voltage value and the load current with a pre-stored curve database to obtain a matched curve parameter as a corresponding power measurement value. The above power supply detection method measures the no-load voltage value, the working voltage value, and the working current value through the power supply controller of the power supply circuit, and performs curve parameter matching according to the curve database to obtain a corresponding power measurement value, so as to be applicable to battery series power supply and accurately measure the battery power. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description 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 efforts.

[0014] Figure 1 It is a flowchart of the power supply detection method provided by the embodiments of the present invention;

[0015] Figure 2 It is the overall circuit structure diagram of the power supply circuit provided by the embodiments of the present invention;

[0016] Figure 3It is a partial circuit structure diagram of the power supply circuit provided by an embodiment of the present invention;

[0017] Figure 4 It is another partial circuit structure diagram of the power supply circuit provided by an embodiment of the present invention.

[0018] Reference numerals: U1, power supply controller; U2, charging chip; R1, detection resistor; 1, buck circuit; 2, operational amplifier; U12, buck chip; C125, first capacitor; L5, fifth inductor; C130, second capacitor; R50, first resistor; U7, first operational amplifier chip; U8, second operational amplifier chip; R33, third resistor; R34, fourth resistor; R35, fifth resistor; R100, sixth resistor; C225, third capacitor; C107, fourth capacitor; C7, fifth capacitor; C106, sixth capacitor; S1, control switch; BAT, battery pack. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0021] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0022] It should be further understood that the term " / and" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0023] An embodiment of the present invention discloses a power supply detection method applied to series-connected batteries. The method is used in a power supply controller of a power supply circuit applied to series-connected batteries, as Figure 2As shown in the figure, the power supply circuit further includes an operational amplifier 2, a step-down circuit 1, and a detection resistor R1. The switch control terminal of the power supply controller U1 is connected to the control switch S1. The power supply input terminal of the power supply controller U1 is connected to the positive electrode of the battery pack BAT through the step-down circuit 1. The voltage detection terminal of the power supply controller U1 is connected to the positive electrode of the battery pack BAT through the operational amplifier 2. The two current detection terminals of the power supply controller U1 are respectively connected to both ends of the detection resistor R1. The detection resistor R1 is serially arranged between the negative electrode of the battery pack BAT and the ground terminal. The battery pack BAT includes a plurality of batteries connected in series.

[0024] The power supply detection method disclosed in this application is a power supply detection method applied to series-connected batteries. As Figure 1 shown, the power supply detection method includes steps S110 to S140.

[0025] S110. If a conduction signal is received through the switch control terminal, obtain the no-load voltage value of the voltage detection terminal.

[0026] The user can operate the control switch to conduct. After the control switch conducts, the switch control terminal can receive a conduction signal. At this time, no load is connected to the power supply circuit yet. Then the power supply controller can obtain the voltage value detected by the voltage detection terminal as the no-load voltage value.

[0027] S120. Control the load to be connected to both poles of the battery pack, and obtain the working voltage value of the voltage detection terminal and the working current value of the current detection terminal.

[0028] Further control the load to be connected to both poles of the battery pack. At this time, the battery pack supplies power to the load. At the same time, the power supply controller can obtain the voltage value obtained by the voltage detection terminal again. Since a load is connected to the power supply circuit at this time, the voltage value obtained by the voltage detection terminal is the working voltage value. Further, the working voltage value can be obtained through the current detection terminal.

[0029] S130. Analyze the no-load voltage value, the working voltage value, and the working current value according to a preset load current analysis rule to obtain the corresponding load current.

[0030] Further, by analyzing the no-load current value, the working current value, and the working voltage value, the corresponding load current can be obtained. The load current can be analyzed through the load current analysis rule to obtain the load current. The load current is also the current value flowing in the current load.

[0031] In a more specific embodiment, step S130 specifically includes the following steps: calculating the resistance value of the detection resistor, the working voltage value, and the working current value according to the first formula in the load current analysis rule to obtain the corresponding battery internal resistance; calculating the battery internal resistance, the working voltage value, and the no-load voltage value according to the second formula in the load current analysis rule to obtain the corresponding load current.

[0032] Specifically, the resistance value of the detection resistor, the working voltage value, and the working current value can be calculated according to the first formula configured in the load current analysis rule, so as to correspondingly obtain the battery internal resistance. The voltage value at the ungrounded end of the detection resistor can be calculated first, U f =I g ×R0; where, I g is the working current value, R0 is the resistance value of the detection resistor, and U f is the voltage value at the ungrounded end of the detection resistor; further calculate the battery internal resistance R c =(U1 - U f )×R0 / U f ; where, U1 is the working voltage value, and R c is the battery internal resistance.

[0033] Furthermore, the battery internal resistance, the working voltage value, and the no-load voltage value can be calculated according to the second formula configured in the load current analysis rule, so as to obtain the corresponding load current. Specifically, the second calculation formula can be expressed as I load =(U0 - U1) / R c ; where, U0 is the no-load voltage value, and I load is the calculated load current.

[0034] S140. Perform curve parameter matching on the working voltage value and the load current with a pre-stored curve database to obtain the matching curve parameters as the corresponding power measurement values.

[0035] Multiple power detection curves are correspondingly stored in the curve database, and each power detection curve is a voltage-power curve obtained by testing under the condition of supplying power to a specific load. Specifically, the parameter information included in each power detection curve includes the no-load voltage value, the working voltage value, the consumed battery power value, and the battery internal resistance.

[0036] For example, for a battery pack composed of two-section batteries, when the load current is constant at 1 A, the data obtained from the discharge of the battery pack are shown in Table 1; for the case where the load current is constant at other current values (such as 0.4 A or 1.6 A), the measured data are different. The value of Q (in mAh) in each row of Table 1 represents the cumulative reduced battery power corresponding to each 1% reduction in power (the battery power difference between adjacent rows is 1%).

[0037] Table 1

[0038] <![CDATA[U0(mV)]]> <![CDATA[U1 (mV)]]> Q (mAh) <![CDATA[R c (mΩ)]]> 8587 0 135 8560 8475 63 135 8535 8448 126 138 8512 8424 189 140 8489 8401 252 140 8467 8378 315 141 8445 8356 378 141 8423 8334 141 141 8402 8312 504 143 8380 8291 567 141 8359 8270 630 141 8338 8249 693 141 8317 8228 756 141 8296 8204 819 146 8276 8184 882 146

[0039] Since an operational amplifier is used to step down the voltage value of the battery pack in the embodiment of the present application, the no-load voltage value U0' actually measured by the power supply controller in Table 1 = U0 / 2, the working voltage value U1' actually measured by the power supply controller = U1 / 2, and the internal resistance R of the actual single battery c ’ = R c / 2; then, by constructing a two-dimensional curve based on the actually measured working voltage value and the consumed battery power value, or by constructing a two-dimensional curve based on the actually measured no-load voltage value and the consumed battery power value, the corresponding power detection curve can be obtained.

[0040] By matching the battery detection curve included in the curve database with the working voltage value and the load current, the curve parameters on the corresponding battery detection curve can be obtained and finally the power measurement value can be obtained, and the power measurement value is also the remaining power of the measured battery pack.

[0041] In a more specific embodiment, step S140 specifically includes the following steps: obtaining the power detection curve matching the load current in the curve database as the corresponding target curve; obtaining the power measurement value corresponding to the curve position matching the working voltage value in the target curve.

[0042] Specifically, the load current can be matched with each power detection curve in the curve database, so as to obtain a power detection curve that matches the load current as the target curve. Further, the curve parameters corresponding to the curve sites that match the working voltage value (or no-load voltage value) in the target curve are obtained, and the corresponding power measurement value is obtained according to the curve parameters. Since the working voltage value is negatively correlated with the consumed battery power value in the power detection curve and the working voltage value decreases monotonically, the working voltage value can be used to obtain a uniquely matched curve site in the target curve and determine the corresponding power measurement value. Similarly, since the no-load voltage value is negatively correlated with the consumed battery power value in the power detection curve and the no-load voltage value also decreases monotonically, the no-load voltage value can also be used to replace the working voltage value to match the curve site in the target curve and obtain the power measurement value.

[0043] In a more specific embodiment, the obtaining the power measurement value corresponding to the curve site that matches the working voltage value in the target curve includes: obtaining the consumed battery power value corresponding to the curve site that matches the working voltage value in the target curve; calculating the remaining ratio corresponding to the consumed battery power value according to the total power to obtain the corresponding power measurement value.

[0044] Specifically, the consumed battery power value corresponding to the curve site that matches the working voltage value in the target curve can be obtained, and there is only one curve site that matches the working voltage value obtained from the target curve. After the number of batteries in the battery pack is determined, the total battery power is also uniquely determined; the power difference between the total power and the consumed battery power value can be calculated, and the ratio of the power difference to the total power can be calculated to obtain the remaining ratio of the battery pack power, and the obtained remaining ratio is used as the power measurement value.

[0045] For example, for the battery pack composed of double-section batteries in the specific embodiment of the present application, the total power is 6300 mAh, and the current consumed battery power value is 693 mAh, then the remaining ratio can be calculated to be 89%, that is, the power measurement value is finally obtained.

[0046] The embodiment of the present invention also discloses a power supply circuit applied to battery series connection, wherein the power supply circuit applies the power supply detection method applied to battery series connection as described in the above embodiment, such as Figure 2As shown, the power supply circuit further includes an operational amplifier 2, a buck circuit 1, and a detection resistor R1; the switch control terminal of the power supply controller U1 is connected to one end of the control switch S1, and the other end of the control switch S1 is grounded; the power supply input terminal of the power supply controller U1 is connected to the positive electrode of the battery pack BAT through the buck circuit 1, the voltage detection terminal of the power supply controller U1 is connected to the positive electrode of the battery pack BAT through the operational amplifier 2, the two current detection terminals of the power supply controller U1 are respectively connected to both ends of the detection resistor R1, and the detection resistor R1 is serially arranged between the negative electrode of the battery pack BAT and the ground terminal; the battery pack BAT includes a plurality of batteries connected in series.

[0047] In order to implement power supply detection for a battery pack BAT composed of two batteries ( Figure 2 the battery CELL1 and the battery CELL2 shown in), the buck circuit 1 can be set to reduce the voltage of the battery pack BAT of about 7.6V to about 3.7V, and then supply power to the system through the VSYS port (that is, the power supply input terminal of the power supply controller U1). The two current detection terminals of the power supply controller U1 are respectively connected to both ends of the detection resistor R1, that is, the SENSEP port and the SENSEN port are used as the two current detection terminals to detect the current value flowing through the detection resistor R1. The operational amplifier 2 is a voltage follower circuit, and its purpose is to step down the positive electrode voltage of the battery pack BAT so that the voltage drops to half of the original value and is output to the VBATSENSE port (that is, the voltage detection terminal of the power supply controller U1) so that the power supply controller U1 can detect the positive electrode voltage of the battery pack BAT. The detection resistor R1 is used to detect the current value in the battery energization circuit in the main line, and the resistance value of the detection resistor R1 is a fixed value.

[0048] As Figure 3 shown, the buck circuit 1 includes a buck chip U12, a first capacitor C125, and a fifth inductor L5; the second pin of the buck chip U12 is connected to the positive electrode of the battery pack BAT; the sixth pin of the buck chip U12 is connected to one end of the fifth inductor L5, and the other end of the fifth inductor L5 is connected to the power supply input terminal of the power supply controller U1; the first capacitor C125 is connected in parallel between the second pin of the buck chip U12 and the ground terminal. Further, the buck circuit 1 further includes a second capacitor C130 and a first resistor R50; the second capacitor C130 and the first resistor R50 are both connected in parallel between the other end of the fifth inductor L5 and the ground terminal.

[0049] Specifically, the step-down circuit 1 is composed of a step-down chip U12, a first capacitor C125, and a fifth inductor L5. Among them, the first capacitor C125 is used to isolate the second pin of the step-down chip U12 from the ground terminal, thereby improving the isolation degree of the second pin. To enhance the actual usage effect, multiple capacitors can also be set in parallel with the first capacitor C125. The fifth inductor L5 is connected to the sixth pin to filter the voltage output from the sixth pin, so as to reduce the clutter in the voltage signal and improve the reliability of power supply to the system. Similarly, a second capacitor C130 can be set to increase the isolation degree between the fifth inductor L5 and the ground terminal. To enhance the actual usage effect, multiple capacitors can also be set in parallel with the second capacitor C130. Current limiting is achieved by setting a first resistor R50, thereby realizing overcurrent protection.

[0050] As Figure 4 shown, the operational amplifier 2 includes a first operational amplifier chip U7, a second operational amplifier chip U8, a third resistor R33, a fourth resistor R34, a fifth resistor R35, a sixth resistor R100, a third capacitor C225, and a fourth capacitor C107. One end of the third pin of the first operational amplifier chip U7 and one end of the third resistor R33 are both connected to the positive pole of the battery pack BAT. The first pin of the first operational amplifier chip U7 is grounded, and the second pin of the first operational amplifier chip U7 is connected to the fifth pin of the second operational amplifier chip U8. The other end of the third resistor R33 is connected to the first pin of the second operational amplifier chip U8, one end of the fourth resistor R34, and one end of the third capacitor C225. The second pin of the second operational amplifier chip U8 is connected to the other end of the fourth resistor R34 and the other end of the third capacitor C225 and is grounded. The fifth resistor R35 is serially arranged between the third pin and the fourth pin of the second operational amplifier chip U8, and the fourth pin of the second operational amplifier chip U8 is also connected to one end of the sixth resistor R100. The other end of the sixth resistor R100 is connected to one end of the fourth capacitor C107, and the connection point is connected to the voltage detection terminal of the power supply controller U1. The other end of the fourth capacitor C107 is grounded. Among them, the operational amplifier 2 further includes a fifth capacitor C7 and a sixth capacitor C106. One end of the fifth capacitor C7 is connected to the second pin of the first operational amplifier chip U7, and the other end of the fifth capacitor C7 is grounded. One end of the sixth capacitor C106 is connected to the third pin of the first operational amplifier chip U7, and the other end of the sixth capacitor C106 is grounded.

[0051] The operational amplifier 2 mainly consists of a first operational amplifier chip U7 and a second operational amplifier chip U8. The first operational amplifier chip U7 steps down the positive voltage of the battery pack BAT to 5V and inputs it to the fifth pin of the second operational amplifier chip U8 to supply power to the second operational amplifier chip U8. Further, the second operational amplifier chip U8 steps down the voltage input at the first pin to half of the positive voltage of the battery pack BAT and outputs it from the fourth pin of the second operational amplifier chip U8.

[0052] More specifically, the power supply circuit further includes a charging chip U2, and the charging chip U2 is serially arranged between the positive pole of the battery pack BAT and the charging input port. Further, the charging chip U2 can also be serially arranged on the positive pole of the battery pack BAT, and then the charging chip U2 steps down the voltage input at the charging input port to the charging voltage and inputs it to the positive pole of the battery pack BAT, thereby realizing charging of the battery pack BAT.

[0053] The present invention discloses a power supply circuit and a power supply detection method applied to battery connection in series. The power supply detection method includes: if a conduction signal is received through the switch control terminal, obtaining the no-load voltage value of the voltage detection terminal; controlling a load to be connected to two poles of the battery pack, and obtaining the working voltage value of the voltage detection terminal and the working current value of the current detection terminal; analyzing the no-load voltage value, the working voltage value and the working current value according to a preset load current analysis rule to obtain a corresponding load current; matching curve parameters of the working voltage value and the load current with a pre-stored curve database to obtain a matched curve parameter as a corresponding power measurement value. The above power supply detection method measures the no-load voltage value, the working voltage value and the working current value through the power supply controller of the power supply circuit, and obtains the corresponding power measurement value through curve parameter matching with the curve database, thereby being applicable to battery connection in series and capable of accurately measuring the battery power.

[0054] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within 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

1. A power supply detection method applied to battery series connection, which is used in a power supply controller of a power supply circuit applied to battery series connection, and is characterized in that, The switching control terminal of the power supply controller is connected to one end of the control switch, and the other end of the control switch is grounded; the power supply circuit further includes an operational amplifier, a buck circuit, and a detection resistor. The power supply input terminal of the power supply controller is connected to the positive electrode of the battery pack through the buck circuit. The voltage detection terminal of the power supply controller is connected to the positive electrode of the battery pack through the operational amplifier. The two current detection terminals of the power supply controller are respectively connected to both ends of the detection resistor. The detection resistor is serially arranged between the negative electrode of the battery pack and the grounding terminal; the battery pack includes a plurality of batteries connected in series; The operational amplifier includes a first operational amplifier chip, a second operational amplifier chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a third capacitor, and a fourth capacitor; the third pin of the first operational amplifier chip and one end of the third resistor are both connected to the positive electrode of the battery pack; the first pin of the first operational amplifier chip is grounded, and the second pin of the first operational amplifier chip is connected to the fifth pin of the second operational amplifier chip; the other end of the third resistor is connected to the first pin of the second operational amplifier chip, one end of the fourth resistor, and one end of the third capacitor. The second pin of the second operational amplifier chip is connected to the other end of the fourth resistor and the other end of the third capacitor and is grounded; the fifth resistor is serially arranged between the third pin and the fourth pin of the second operational amplifier chip. The fourth pin of the second operational amplifier chip is further connected to one end of the sixth resistor; the other end of the sixth resistor is connected to one end of the fourth capacitor, and the connection point is connected to the voltage detection terminal of the power supply controller; the other end of the fourth capacitor is grounded; The power supply detection method includes: If a conduction signal is received through the switching control terminal, obtain the no-load voltage value of the voltage detection terminal; Control the load to be connected to both poles of the battery pack, and obtain the working voltage value of the voltage detection terminal and the working current value of the current detection terminal; Analyze the no-load voltage value, the working voltage value, and the working current value according to a preset load current analysis rule to obtain the corresponding load current; Perform curve parameter matching on the working voltage value and the load current with a pre-stored curve database to obtain a matched curve parameter as the corresponding power measurement value.

2. The power supply detection method applied to battery series connection according to claim 1, wherein The analyzing the no-load voltage value, the working voltage value, and the working current value according to a preset load current analysis rule to obtain the corresponding load current includes: Calculate the resistance value of the detection resistor, the working voltage value, and the working current value according to the first formula in the load current analysis rule to obtain the corresponding internal resistance of the battery; Calculate the internal resistance of the battery, the working voltage value, and the no-load voltage value according to the second formula in the load current analysis rule to obtain the corresponding load current.

3. The power supply detection method applied to battery series connection according to claim 1 or 2, characterized in that The performing curve parameter matching on the working voltage value and the load current with a pre-stored curve database to obtain a matched curve parameter as the corresponding power measurement value includes: Obtain the power detection curve matching the load current in the curve database as the corresponding target curve; Obtain the power measurement value corresponding to the curve point on the target curve that matches the working voltage value.

4. The power supply detection method applied to battery series connection according to claim 3, characterized in that, The step of obtaining the power measurement value corresponding to the curve point on the target curve that matches the working voltage value includes: Obtain the consumed battery power value corresponding to the curve point on the target curve that matches the working voltage value; Calculate the remaining ratio corresponding to the consumed battery power value based on the total power to obtain the corresponding power measurement value.

5. A power supply circuit applied to battery connection in series, characterized in that, The power supply controller of the power supply circuit applies the power supply detection method for battery series connection according to any one of claims 1-4; The buck circuit includes a buck chip, a first capacitor and a fifth inductor; The second pin of the buck chip is connected to the positive pole of the battery pack; the sixth pin of the buck chip is connected to one end of the fifth inductor, and the other end of the fifth inductor is connected to the power supply input terminal of the power supply controller; the first capacitor is connected in parallel between the second pin of the buck chip and the ground terminal.

6. The power supply circuit applied to battery series connection according to claim 5, characterized in that, The buck circuit further includes a second capacitor and a first resistor; Both the second capacitor and the first resistor are connected in parallel between the other end of the fifth inductor and the ground terminal.

7. The power supply circuit applied to battery connection in series according to claim 5, wherein The operational amplifier further includes a fifth capacitor and a sixth capacitor; One end of the fifth capacitor is connected to the second pin of the first operational amplifier chip, and the other end of the fifth capacitor is grounded; One end of the sixth capacitor is connected to the third pin of the first operational amplifier chip, and the other end of the sixth capacitor is grounded.

8. The power supply circuit applied to battery series connection according to claim 5, characterized in that, The power supply circuit further includes a charging chip, and the charging chip is connected in series between the positive pole of the battery pack and the charging input port.

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