Switching power supply circuit, power supply system, power supply chip and electronic equipment

Abstract

The embodiment of the invention provides a switching power supply circuit, a power supply system, a power supply chip and electronic equipment, the switching power supply circuit comprises a switching inductor module, the switching inductor module comprises a first inductor and a first switch, and the first switch is used for controlling the first inductor to charge or discharge; the current detection module is used for outputting sensing current according to the current of the first inductor, and the size of the sensing current is in direct proportion to the size of the current of the first inductor; the current detection and calibration module is used for calibrating the current detection module, so that a first ratio of the sensing current to the current of the first inductor is equal to a preset ratio; wherein the current detection and calibration module calibrates the current detection module according to the rising or falling duration of the sensing current. According to the invention, the detection value of the actual circuit current of the current detection module is close to the ideal design value, so that the phenomenon that the detection value of the actual circuit current of the current detection module has large deviation compared with the design value is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of power supplies, and particularly relates to a switching power supply circuit, a power supply system, and an electronic device. Background Art

[0002] A DC-to-DC converter is a switching power supply circuit that can convert a DC power supply into a DC power supply with a different voltage, so as to meet the power supply requirements of circuit modules with different supply voltages. Currently, among various DC-to-DC converters, due to the advantages of a peak current control mode DC-to-DC converter such as fast response speed and no need to adopt an advanced compensation network compared with a voltage control mode DC-to-DC converter, the peak current control mode DC-to-DC converter is the most widely used in practical applications.

[0003] In the related art, a peak current control mode DC-to-DC converter mainly includes a switching circuit, a voltage feedback loop, and a current feedback loop, and controls the switching circuit in a dual-feedback manner of voltage and current. Among them, in the current feedback loop, it is necessary to collect the inductor current signal to generate a ramp voltage signal, so as to generate a PWM control signal according to the ramp voltage signal combined with the error signal output by the voltage feedback loop, and finally use the PWM control signal to control the switching circuit.

[0004] However, since many non-ideal factors will be introduced during the design and manufacturing process of the circuit, such as being affected by PVT factors (process, voltage, and temperature factors), mismatch factors, parasitics, and stress, etc., there is a large deviation between the actual current detection value of the current feedback loop and the designed value, and this deviation may reach ±30%, which may not only cause a decrease in the load-carrying capacity but also cause damage to the circuit. Summary of the Invention

[0005] In view of the above problems, the embodiments of the present application provide a switching power supply circuit, a power supply system, a power chip, and an electronic device to solve the above technical problems.

[0006] In a first aspect, the embodiments of the present application provide a switching power supply circuit, including:

[0007] A switching inductor module, the switching inductor module includes a first inductor and a first switch, and the first switch is used to control the charging or discharging of the first inductor;

[0008] A current detection module, the current detection module is used to output a sensed current according to the current of the first inductor, and the magnitude of the sensed current is proportional to the magnitude of the current of the first inductor;

[0009] A current detection and calibration module, which is used to calibrate a current detection module so that a first ratio of a sensed current to a current of a first inductor is equal to a preset ratio;

[0010] Wherein, the current detection and calibration module calibrates the current detection module according to a duration of rise or fall of the sensed current.

[0011] In a second aspect, the present application provides a power supply system, which is characterized by including the above-mentioned switching power supply circuit

[0012] In a third aspect, an embodiment of the present application further provides a power supply chip, which is used to control a switching inductor module. The switching inductor module includes a first inductor and a first switch, and the first switch is used to control charging or discharging of the first inductor. The power supply chip includes:

[0013] A current detection module, which is used to output a sensed current according to a current of the first inductor, and a magnitude of the sensed current is proportional to a magnitude of the current of the first inductor;

[0014] A current detection and calibration module, which is used to calibrate the current detection module so that a first ratio of the sensed current to the current of the first inductor is equal to a preset ratio;

[0015] Wherein, the current detection and calibration module calibrates the current detection module according to a duration of rise or fall of the sensed current.

[0016] In a fourth aspect, an embodiment of the present application further provides an electronic device, which includes the above-mentioned power supply chip or power supply system.

[0017] In an embodiment of the present application, since the current detection and calibration module can calibrate the current detection module so that a ratio of the sensed current to the current of the first inductor is equal to a preset ratio, that is to say, after the current detection and calibration module calibrates the current detection module, it can make a detected value of an actual circuit current of the current detection module close to an ideal design value, thereby avoiding a phenomenon that the detected value of the actual circuit current of the current detection module has a large deviation compared with the design value.

[0018] These aspects or other aspects of the present application will be more clearly understood in the following description of the embodiments. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1Shows a schematic diagram of a DC-DC converter in the related art.

[0021] Figure 2 Shows a schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0022] Figure 3 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0023] Figure 4 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0024] Figure 5 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0025] Figure 6 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0026] Figure 7 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0027] Figure 8 Shows a schematic diagram of a current detection module in an embodiment of the present application.

[0028] Figure 9 Shows a schematic diagram of a current detection calibration process in an embodiment of the present application.

[0029] Figure 10 Shows another schematic diagram of a current detection calibration process in an embodiment of the present application.

[0030] Figure 11 Shows a schematic diagram of a variation of the first ratio calibration process in an embodiment of the present application.

[0031] Figure 12 Shows another schematic diagram of a variation of the first ratio calibration process in an embodiment of the present application.

[0032] Figure 13 Shows another schematic diagram of a variation of the first ratio calibration process in an embodiment of the present application.

[0033] Figure 14 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0034] Figure 15 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0035] Figure 16 Shows another schematic diagram of a switching power supply circuit in an embodiment of the present application.

[0036] Figure 17 Another schematic diagram of the switching power supply circuit in the embodiment of the present application is shown.

[0037] Figure 18 Another schematic diagram of the switching power supply circuit in the embodiment of the present application is shown.

[0038] Figure 19 A schematic diagram of the power supply chip in the embodiment of the present application is shown.

[0039] Wherein, 10 is the switching inductor module, 20 is the current detection module, 30 is the current detection and calibration module, 31 is the comparison unit, 32 is the timing unit, 321 is the timer, 322 is the logic circuit, 33 is the driving unit, 40 is the voltage feedback module, 50 is the control module;

[0040] The first voltage AVDD, the second voltage VBST, the first switch S1, the second switch S2, the first inductor L1, the first capacitor C1, the current Iin of the first inductor, the sensed current Isense, the preset reference voltage Vref, the error signal Vea, the control signal Vd, the first diode D1, the error amplifier OP, the first feedback resistor RF1, the second feedback resistor RF2, the ramp signal Vramp, the preset clock signal CLK;

[0041] The first transistor M01, the first resistor R01, the first current source IS01, the second transistor M02, the second resistor R02, the second current source IS02, the third transistor M03, the third resistor R03, the fourth transistor M04, the fifth transistor M05, the sixth transistor M06. Specific implementation manners

[0042] The following details the implementation manners of the present application. The examples of the implementation manners are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The implementation manners described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0043] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0044] In the embodiments of the present application, it should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0045] Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0046] In the description of the embodiments of the present application, words such as "example" or "for example" are used to represent examples, explanations or descriptions. Any embodiment or design described as "for example" or "example" in the embodiments of the present application is not construed as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0047] In addition, "a plurality of" in the embodiments of the present application means two or more. In view of this, "a plurality of" in the embodiments of the present application can also be understood as "at least two". "At least one" can be understood as one or more, for example, understood as one, two or more. For example, including at least one means including one, two or more, and does not limit which ones are included. For example, including at least one of A, B, and C, then what can be included are A, B, C, A and B, A and C, B and C, or A and B and C.

[0048] It should be pointed out that "connection" in the embodiments of the present application can be understood as electrical connection, and the connection of two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0049] In the embodiments of the present application, the first pole / first end of each transistor is one of the source and the drain, and the second pole / second end of each transistor is the other of the source and the drain. Since the source and the drain of a transistor can be symmetric in structure, there may be no difference between the source and the drain in structure, that is to say, there may be no difference between the first pole / first end and the second pole / second end of the transistor in the embodiments of the present application in structure. Exemplarily, when the transistor is a P-type transistor, the first pole / first end of the transistor is the source, and the second pole / second end is the drain; Exemplarily, when the transistor is an N-type transistor, the first pole / first end of the transistor is the drain, and the second pole / second end is the source.

[0050] In the circuit structure provided by the embodiments of the present application, nodes such as the first node and the second node do not represent actual existing components, but represent the convergence points of relevant couplings in the circuit diagram, that is to say, these nodes are nodes equivalent to the convergence points of relevant couplings in the circuit diagram.

[0051] Currently, the peak current control mode DC-DC converter is a widely used switching power supply. Refer to Figure 1 , Figure 1 shows a schematic diagram of a DC-DC converter in the related art. Among them, the DC-DC converter includes a BOOST boost circuit and a feedback control circuit for controlling the BOOST boost circuit. Among them, the BOOST boost circuit is composed of an inductor L0 connected to the power supply terminal VDD, a diode D0, a voltage stabilizing capacitor C0 for the output voltage Vout, and a transistor MN1. The feedback control circuit is composed of a current detection circuit, a resistor R3, a feedback resistor R1, a feedback resistor R2, an operational amplifier OP, a comparator COMP, and a logic drive module for accessing the clock signal CLK.

[0052] In the feedback control circuit, the inverting input terminal of the operational amplifier OP is connected between the feedback resistor R1 and the feedback resistor R2. The non-inverting input terminal of the operational amplifier OP accesses the reference voltage Vref. The feedback resistor R1, the feedback resistor R2, and the operational amplifier OP form a voltage feedback loop and output an error signal Verror to the inverting input terminal of the comparator COMP; The current detection circuit can output an amplified current signal I1 during the current rise of the inductor L0. The amplified current signal I1 generates a ramp signal Vra through the resistor R3 and inputs the ramp signal Vra to the non-inverting input terminal of the comparator COMP, finally forming a double-loop feedback control circuit of a voltage loop and a current loop.

[0053] However, since many non-ideal factors are introduced during the design and manufacturing process of the circuit, such as being affected by PVT factors (process, voltage, and temperature factors), mismatch factors, parasitics, and stress, etc., there is a large deviation between the actual current detection value of the produced current detection circuit and the designed value. This deviation can reach up to ±30%, which may not only cause a decrease in the load-carrying capacity of the DC-DC converter but also may damage the circuit under the influence of extreme deviations.

[0054] Therefore, this application provides a switching power supply circuit, a power supply system, a power chip, and an electronic device, which will be described in detail below respectively.

[0055] First, refer to Figure 2 , Figure 2 which shows a schematic diagram of the switching power supply circuit in an embodiment of this application. Among them, the switching power supply circuit includes a switching inductor module 10, a current detection module 20, and a current detection calibration module 30.

[0056] Specifically, the switching inductor module 10 is used to connect to the first voltage AVDD and output the second voltage VBST under the control of the control signal Vd. The second voltage VBST can be greater than the first voltage AVDD, or the second voltage VBST can also be less than the first voltage AVDD. For example, the switching inductor module 10 can include a boost circuit so that the switching inductor module 10 can output a second voltage VBST with a higher voltage according to the first voltage AVDD; or, for another example, the switching inductor module 10 can include a buck circuit so that the switching inductor module 10 can output a second voltage VBST with a lower voltage according to the first voltage AVDD.

[0057] In some embodiments of this application, the switching inductor module 10 can be controlled based on the peak current control mode, and the control circuit of the switching inductor module 10 includes a current loop and a voltage loop feedback control loop. In some embodiments of this application, the switching inductor module 10 can also be controlled based on the voltage control mode, and the control circuit of the switching inductor module 10 includes a voltage loop feedback control loop, etc.

[0058] It should be noted that the switching inductor module 10 includes a first inductor L1, a first capacitor C1, and at least one first switch S1. The first switch S1 is used to control the charging or discharging of the first inductor L1. The connection manners of the first inductor L1, the first capacitor C1, and at least one first switch S1 are different in the BOOST boost circuit and the BUCK buck circuit.

[0059] For example, taking the BOOST boost circuit as an example, refer to Figure 3 , Figure 3Another schematic diagram of the switching power supply circuit in the embodiment of the present application is shown. Among them, the first end of the first inductor L1 is connected to the first voltage AVDD, the first end of the first switch S1 is connected to the second end of the first inductor L1, the second end of the first switch S1 is connected to the ground terminal, the control end of the first switch S1 is connected to the control signal Vd, the first end of the first diode D1 is connected to the second end of the first inductor L1, the first end of the first capacitor C1 is connected to the second end of the first diode D1, the second end of the first capacitor C1 is connected to the ground terminal, and the first end of the first capacitor C1 outputs the second voltage VBST.

[0060] When the control signal Vd controls the first switch S1 to conduct, the first voltage AVDD charges the first inductor L1, the current of the first inductor L1 gradually rises, the first diode D1 is in the cut-off state, and the first capacitor C1 discharges to output the second voltage VBST; when the control signal Vd controls the first switch S1 to disconnect, the first inductor L1 discharges and the current gradually decreases, the first diode D1 is in the conducting state, the first voltage AVDD is superimposed on the induced electromotive force of the first inductor L1. Since the induced electromotive force of the first inductor L1 is in the same direction as the first voltage AVDD, a second voltage VBST with a higher voltage can be output.

[0061] For another example, taking the BUCK buck circuit as an example, refer to Figure 4 , Figure 4 Another schematic diagram of the switching power supply circuit in the embodiment of the present application is shown. The first end of the first switch S1 is connected to the first voltage AVDD, the second end of the first switch S1 is connected to the first end of the first inductor L1, the second end of the first inductor L1 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the ground terminal, the first end of the first capacitor C1 outputs the second voltage VBST, the first end of the first diode D1 is connected to the first end of the first inductor L1, and the second end of the first diode D1 is connected to the ground terminal.

[0062] When the control signal Vd controls the first switch S1 to disconnect, the first inductor L1 discharges and the current gradually decreases, the first diode D1 is in the conducting state, and the first capacitor C1 discharges to output the second voltage VBST; when the control signal Vd controls the first switch S1 to conduct, the first inductor L1 charges and the current gradually rises, the first diode D1 is in the cut-off state, the first voltage AVDD is superimposed on the induced electromotive force of the first inductor L1. Since the induced electromotive force of the first inductor L1 is in the opposite direction to the first voltage AVDD, a second voltage VBST with a lower voltage can be output.

[0063] It can be understood that the above Figure 3 and Figure 4As an exemplary embodiment of the switched-inductor module 10 of the present application, those skilled in the art can make equivalent modification designs to the switched-inductor module 10 under the guidance of the present application. For example, the switched-inductor module 10 may further include a Buck-Boost step-up / step-down circuit; for another example, refer to Figure 5 , Figure 5 shows another schematic diagram of the switching power supply circuit in the embodiment of the present application. In the above embodiment, the first diode D1 can also be replaced by the first switch S1', and only the control signal Vd needs to be inverted and input to the control terminal of the first switch S1'.

[0064] The current detection module 20 is configured to output a sense current Isense according to the current Iin of the first inductor L1 of the switched-inductor module 10. The magnitude of the sense current Isense is proportional to the magnitude of the current Iin of the first inductor L1. Generally, the magnitude of the sense current Isense is smaller than the magnitude of the current Iin of the first inductor L1. For example, the ratio of the magnitude of the sense current Isense to the current Iin of the first inductor L1 is fixed at 1:12000, so as to reduce the power consumption and design difficulty of the current detection module 20.

[0065] In some embodiments of the present application, for example, in the embodiment where the switched-inductor module 10 is controlled based on the peak current control mode, the sense current Isense can be used as a feedback signal of the current loop feedback loop, so that the control circuit of the switched-inductor module 10 can generate a control signal Vd based on the sense current Isense. In some embodiments of the present application, for example, for the embodiment where the switched-inductor module 10 can be controlled based on the voltage control mode, the sense current Isense can also be used as a detection current for over-current protection (OCP) judgment to avoid over-current of the first inductor L1.

[0066] As an example, refer to Figure 6 , Figure 6 shows a schematic diagram of the current detection module 20 in the embodiment of the present application. Among them, the current detection module 20 includes a first transistor M01. The first end of the first transistor M01 is connected to the first inductor L1. The control terminal of the first transistor M01 is used to access the control signal Vd. The first transistor M01 can be composed of multiple transistors in parallel. The overall width-to-length ratio of the first transistor M01 can be changed by adjusting the number of transistors in parallel. The ratio between the width-to-length ratio of the first transistor M01 and the corresponding transistor of the first switch S1 is the ratio of the sense current Isense to the current Iin of the first inductor L1.

[0067] For example, assume that the ratio of the aspect ratio of the transistor corresponding to the first switch S1 to the aspect ratio of the first transistor M01 is 1 / k1. Then, the magnitude of the sense current Isense satisfies the following relationship:

[0068] Isense = Iin * 1 / k1

[0069] It can be seen that by setting the coefficient k1 in the above formula, the magnification / reduction factor of the sense current Isense relative to the rising current of the first inductor L1 can be adjusted, and the magnitude of the sense current Isense is proportional to the magnitude of the current Iin of the first inductor L1.

[0070] As another example, refer to Figure 7 , Figure 7 FIG. shows a schematic diagram of a current detection module 20 in an embodiment of the present application. Among them, the current detection module 20 further includes a current mirror unit 21. The current mirror unit 21 is used to mirror the current flowing through the first transistor M01 and output the sense current Isense. At this time, the sense current Isense is not only related to the ratio of the aspect ratio of the transistor corresponding to the first switch S1 to the aspect ratio of the first transistor M01, but also related to the mirror ratio of the current mirror unit 21.

[0071] For example, assume that the ratio of the aspect ratio of the transistor corresponding to the first switch S1 to the aspect ratio of the first transistor M01 is 1 / k1, and the ratio of the current mirror unit 21 is 1 / k2. Then, the magnitude of the sense current Isense satisfies the following relationship:

[0072] Isense = Iin * 1 / k1 * 1 / k2

[0073] It can be seen that by setting the magnitudes of the coefficients k1 and / or k2 in the above formula, the magnification / reduction factor of the sense current Isense relative to the rising current of the first inductor L1 can be adjusted, and the magnitude of the sense current Isense is proportional to the magnitude of the current Iin of the first inductor L1.

[0074] As yet another example, refer to Figure 8 , Figure 8FIG. 0 shows a schematic diagram of the current detection module 20 in an embodiment of the present application. Among them, the current mirror unit 21 includes a first resistor R01, a first current source IS01, a second transistor M02, a second resistor R02, a second current source IS02, a third transistor M03, a third resistor R03, a fourth transistor M04, a fifth transistor M05, and a sixth transistor M06; a first end of the first transistor M01 is connected to the first inductor L1, and a control end of the first transistor M01 is used to access a control signal Vd; a first end of the first resistor R01 is connected to a second end of the first transistor M01, and a second end of the first resistor R01 is connected to a ground terminal; an input end of the first current source IS01 is connected to a power supply terminal VDD, and an output end of the first current source IS01 is connected to a first end of the second transistor M02; a control end of the second transistor M02 is connected to a control end of the third transistor M03, a first end of the second resistor R02 is connected to a second end of the second transistor M02, and a second end of the second resistor R02 is connected to the second end of the first transistor M01; an input end of the second current source IS02 is connected to the power supply terminal VDD, an output end of the second current source IS02 is connected to a first end of the third transistor M03, and the first end of the third transistor M03 is connected to the control end of the third transistor M03; a first end of the third resistor R03 is connected to a second end of the third transistor M03, and a second end of the third resistor R03 is connected to the ground terminal; a second end of the fifth transistor M05 is connected to the power supply terminal VDD, a control end of the fifth transistor M05 is connected to a first end of the fifth transistor M05, and the first end of the fifth transistor M05 is connected to a first end of the fourth transistor M04; a control end of the fourth transistor M04 is connected to a first end of the second transistor M02, and a second end of the fourth transistor M04 is connected to the second end of the third transistor M03; a second end of the sixth transistor M06 is connected to the power supply terminal VDD, a control end of the sixth transistor M06 is connected to the control end of the fifth transistor M05, and a first end of the sixth transistor M06 is used to output a sense current Isense.

[0075] It should be noted that in Figure 8 , the current mirror flowing through the fifth transistor M05 is equal to the current flowing through the fourth transistor M04, and the fifth transistor M05 and the sixth transistor M06 are current mirrors of each other. Assuming that the ratio between the aspect ratio of the transistor corresponding to the first switch S1 and the aspect ratio of the first transistor M01 is 1 / k1, and the mirror ratio between the fifth transistor M05 and the sixth transistor M06 is k, then the sense current Isense output from the second end of the sixth transistor M06 satisfies the following relational expression:

[0076] Isense = 1 / k1 * k * Iin * R01 / R02

[0077] It can be seen that by setting the coefficient k1 and / or k and / or the ratio of R01 / R02 in the above formula, the amplification factor / reduction factor of the sensed current Isense relative to the rising current of the first inductor L1 can be adjusted, and the magnitude of the sensed current Isense is made proportional to the magnitude of the current Iin of the first inductor L1.

[0078] It should be noted that due to the influence of PVT factors (process, voltage, and temperature factors), mismatch factors, parasitics, and stress, etc., the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 may deviate from the designed value. For example, in an embodiment where the current detection module 20 outputs the sensed current Isense according to the current Iin of the first inductor L1 at a designed ratio of 1:12000, the actual ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 may be 1:10000, which may cause a reduction in the load-carrying capacity of the switching power supply circuit and may cause circuit damage under the influence of extreme deviations.

[0079] The current detection calibration module 30 can calibrate the current detection module 20, so that the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is equal to a preset ratio. For example, in the above embodiment where the actual ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is 1:10000, after the current detection calibration module 30 calibrates the current detection module 20, the switching inductor module 10 can output the sensed current Isense according to the current Iin of the first inductor L1 at a ratio of 1:12000.

[0080] In some embodiments of the present application, for example, in an embodiment where the current detection module 20 includes a first transistor M01, referring to Figure 6 , the current detection calibration module 30 is used to control the number of parallel transistors of the first transistor M01. Therefore, the aspect ratio of the first transistor M01 can be changed, so that the ratio between the aspect ratio of the transistor corresponding to the first switch S1 and the aspect ratio of the first transistor M01 is changed, thereby calibrating the current detection module 20 so that the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is equal to a preset ratio.

[0081] In some embodiments of the present application, for example, in an embodiment where the current detection module 20 includes a first transistor M01 and a current mirror unit, referring to Figure 7, the current detection calibration module 30 is used to control the number of parallel transistors of the first transistor M01, so that the ratio between the aspect ratio of the transistor corresponding to the first switch S1 and the aspect ratio of the first transistor M01 changes, thereby calibrating the current detection module 20 so that the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is equal to a preset ratio; and / or, the current detection calibration module 30 is used to control the mirror ratio of the current mirror unit 21, thereby calibrating the current detection module 20 so that the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is equal to a preset ratio.

[0082] In some embodiments of the present application, for example, for the embodiment where the current detection module 20 includes a circuit as Figure 8 shown, the current detection calibration module 30 is used to control the number of parallel transistors of the first transistor M01. Combining with the calculation formula of the sensed current Isense and the current Iin of the first inductor L1, Isense = 1 / k1 * k * Iin * R01 / R02, it can be seen that controlling the number of parallel transistors of the first transistor M01 is equivalent to changing the parameter k1 in the formula, thereby realizing the calibration of the current detection module 20.

[0083] In some embodiments of the present application, for example, for the embodiment where the current detection module 20 includes a circuit as Figure 8 shown, the current detection calibration module 30 can control the size of the first resistor R01. Combining with the calculation formula of the sensed current Isense and the current Iin of the first inductor L1, Isense = 1 / k1 * k * Iin * R01 / R02, it can be seen that controlling the size of the first resistor R01 is equivalent to changing the parameter R01 in the formula, thereby realizing the calibration of the current detection module 20.

[0084] In some embodiments of the present application, for example, for the embodiment where the current detection module 20 includes a circuit as Figure 8 shown, the current detection calibration module 30 can control the sizes of the second resistor R02 and the third resistor R03. Combining with the calculation formula of the sensed current Isense and the current Iin of the first inductor L1

[0085] Isense = 1 / k1 * k * Iin * R01 / R02, it can be seen that controlling the size of the second resistor R02 is equivalent to changing the parameter R02 in the formula, thereby realizing the calibration of the current detection module 20.

[0086] In some embodiments of the present application, for example, for the embodiment where the current detection module 20 includes a circuit as Figure 8In the embodiment of the circuit shown, the current detection calibration module 30 can control the mirror ratio of the fifth transistor M05 and the sixth transistor M06. Combining with the calculation formula of the sensed current Isense and the current Iin of the first inductor L1: Isense = 1 / k1*k*Iin*R01 / R02, it can be seen that controlling the mirror ratio of the fifth transistor M05 and the sixth transistor M06 (i.e., the coefficient k) can change the ratio of the sensed current Isense to the current Iin of the first inductor L1 to a preset ratio, thereby realizing the calibration of the current detection module 20.

[0087] In the embodiment of the present application, the current detection calibration module 30 can calibrate the current detection module 20 according to the rising or falling duration of the sensed current Isense.

[0088] It should be noted that when the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 deviates from the preset ratio, the rising or falling duration of the sensed current Isense will change.

[0089] For example, taking the preset ratio of the sensed current Isense output by the above current detection module 20 to the current Iin of the first inductor L1 as 1:12000, if the actual ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is 1:10000, the sensed current Isense is smaller than the actual value. When the period of the current Iin of the first inductor L1 rising once and falling once is fixed, the time for the sensed current Isense to rise from the minimum value to the maximum value will be extended, and under feedback control, the time for the sensed current Isense to fall from the maximum value to the minimum value will be shortened. Therefore, the current detection calibration module 30 of the present application can calibrate the current detection module 20 according to the rising or falling duration of the sensed current Isense, so that the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is equal to the preset ratio.

[0090] It can be seen that in the embodiment of the present application, since the current detection calibration module 30 can calibrate the current detection module 20 to make the ratio of the sensed current Isense to the current Iin of the first inductor L1 equal to the preset ratio, that is to say, after the current detection calibration module 30 calibrates the current detection module 20, it can make the detected value of the actual circuit current of the current detection module 20 close to the ideal design value, thereby avoiding the phenomenon that the detected value of the actual circuit current of the current detection module 20 has a large deviation compared with the design value.

[0091] It should be noted that the rising or falling speed of the sensed current Isense is affected by the impedance of the corresponding electronic components. For example, during the rising period of the sensed current Isense, since the impedance of the first switch S1 is determined, it is relatively easy for the current detection calibration module 30 to calibrate the current detection module 20 according to the rising duration of the sensed current Isense. However, when the current detection calibration module 30 calibrates the current detection module 20 according to the falling duration of the sensed current Isense, it is necessary to standardize the load connected to the switching power supply circuit (such as connecting a standard resistor with a known resistance), and then use the current detection calibration module 30 to calibrate the current detection module 20 according to the falling duration of the sensed current Isense.

[0092] In some embodiments of the present application, for example, in the embodiment where the current detection calibration module 30 can calibrate the current detection module 20 according to the rising duration of the sensed current Isense, when the first duration of the sensed current Isense rising is not equal to the first preset duration, the current detection calibration module 30 can calibrate the current detection module 20 until the first duration of the sensed current Isense rising is equal to the first preset duration.

[0093] For example, referring to Figure 9 , Figure 9 shows a schematic diagram of a process of current detection calibration in an embodiment of the present application. When the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is equal to the preset ratio, the first preset duration for the sensed current Isense to rise to the set current value Ic is t01. In actual situations, since the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is greater than the preset ratio, the actual duration for the sensed current Isense output by the current detection module 20 to rise is t1 (t1 < t01). Then, the current detection calibration module 30 can calibrate the current detection module 20 until the first duration of the sensed current Isense rising is equal to the first preset duration t01, thereby realizing the calibration process of the current detection module 20.

[0094] In some embodiments of the present application, for example, in the embodiment where the current detection calibration module 30 can calibrate the current detection module 20 according to the falling duration of the sensed current Isense, when the second duration of the sensed current Isense falling is not equal to the second preset duration, the current detection calibration module 30 can calibrate the current detection module 20 until the second duration of the sensed current Isense falling is equal to the second preset duration.

[0095] For example, referring to Figure 10 , Figure 10Another schematic diagram of the current detection calibration process in an embodiment of the present application is shown. When the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is equal to the preset ratio, the second preset duration for the sensed current Isense to decrease from the set current value Ic is t02. In actual situations, since the ratio of the sensed current Isense output by the current detection module 20 to the current Iin of the first inductor L1 is greater than the preset ratio, the actual duration for the current detection module 20 to output the sensed current Isense to decrease is t2 (t2 > t02). Then, the current detection calibration module 30 can calibrate the current detection module 20 until the second duration for the sensed current Isense to decrease is equal to the second preset duration t02.

[0096] It should be noted that when the current detection calibration module 30 calibrates the current detection module 20 according to the rising duration of the sensed current Isense, the current detection calibration module 30 can obtain the sensed current Isense through a switch connected in parallel with the first switch S1; when the current detection calibration module 30 calibrates the current detection module 20 according to the falling duration of the sensed current Isense, the current detection calibration module 30 can obtain the sensed current Isense through a switch connected in parallel with the first switch S1'.

[0097] In some embodiments of the present application, the current detection calibration module 30 controls the first ratio between the sensed current Isense and the current Iin of the first inductor L1 according to a preset rule to calibrate the current detection module 20. The preset rule includes increasing the first ratio when updating the first ratio for the Nth time and decreasing the first ratio when updating the first ratio for the (N + 1)th time, where N is any integer greater than or equal to 1.

[0098] For example, referring to Figure 11 , Figure 11 A schematic diagram of a variation of the first ratio calibration process in an embodiment of the present application is shown. Among them, the initial value of the first ratio is y3, the first ratio is y4 when updating the first ratio for the first time, the first ratio is y2 when updating the first ratio for the second time, the first ratio is y5 when updating the first ratio for the third time, and the first ratio is y1 when updating the first ratio for the fourth time, where y1 < y2 < y3 < y4 < y5.

[0099] It can be seen that when updating the first ratio according to the above preset rule, the first ratio actually changes alternately between increasing and decreasing, so as to ensure that the first ratio is updated more comprehensively, making the ratio between the sensed current Isense and the current Iin of the first inductor L1 reach the preset ratio.

[0100] In some embodiments of the present application, the current detection calibration module 30 controls the first ratio between the sensed current Isense and the current Iin of the first inductor L1 according to a preset rule to calibrate the current detection module 20. The preset rule includes increasing the first ratio when updating the first ratio for the Nth time, and increasing the first ratio when updating the first ratio for the (N + 1)th time, where N is any integer greater than or equal to 1.

[0101] For example, referring to Figure 12 , Figure 12 shows a schematic diagram of a variation of the first ratio calibration process in an embodiment of the present application. Among them, the initial value of the first ratio is y1, the first ratio is y2 when updating the first ratio for the first time, the first ratio is y3 when updating the first ratio for the second time, the first ratio is y4 when updating the first ratio for the third time, and the first ratio is y5 when updating the first ratio for the fourth time, and y1 < y2 < y3 < y4 < y5.

[0102] It can be seen that when updating the first ratio according to the preset rule, the first ratio actually gradually changes from small to large. Therefore, it can also ensure that the first ratio is updated more comprehensively, so that the ratio between the sensed current Isense and the current Iin of the first inductor L1 reaches the preset ratio.

[0103] In some embodiments of the present application, the current detection calibration module 30 controls the first ratio between the sensed current Isense and the current Iin of the first inductor L1 according to a preset rule to calibrate the current detection module 20. The preset rule includes decreasing the first ratio when updating the first ratio for the Nth time, and decreasing the first ratio when updating the first ratio for the (N + 1)th time, where N is any integer greater than or equal to 1.

[0104] For example, referring to Figure 13 , Figure 13 shows a schematic diagram of a variation of the first ratio calibration process in an embodiment of the present application. Among them, the initial value of the first ratio is y5, the first ratio is y4 when updating the first ratio for the first time, the first ratio is y3 when updating the first ratio for the second time, the first ratio is y2 when updating the first ratio for the third time, and the first ratio is y1 when updating the first ratio for the fourth time, and y1 < y2 < y3 < y4 < y5.

[0105] It can be seen that when updating the first ratio according to the preset rule, the first ratio actually gradually changes from large to small. Therefore, it can also ensure that the first ratio is updated more comprehensively, so that the ratio between the sensed current Isense and the current Iin of the first inductor L1 reaches the preset ratio.

[0106] In some embodiments of the present application, referring to Figure 14 , Figure 14Another schematic diagram of the switching power supply circuit in the embodiment of the present application is shown. Among them, the current detection and calibration module 30 includes a comparison unit 31 and a timing unit 32. The comparison unit 31 is used to determine whether the sensed current Isense reaches a first preset value during the rise of the sensed current Isense, or is used to determine whether the sensed current Isense reaches a second preset value during the fall of the sensed current Isense. The timing unit 32 is used to record the duration of the rise or fall of the sensed current Isense in response to the enable signal output by the comparison unit 31. Therefore, the timing unit 32 can record the duration of the rise or fall of the sensed current Isense to facilitate determining whether the duration of the rise or fall of the sensed current Isense meets the corresponding set duration.

[0107] As an exemplary embodiment, refer to Figure 15 , Figure 15 Another schematic diagram of the switching power supply circuit in the embodiment of the present application is shown. Among them, the comparison unit 31 includes a comparator COMP1, and the timing unit 32 includes a timer 321 and a logic circuit 322. The non-inverting input terminal of the comparator COMP1 is connected to the reference voltage V0, and the inverting input terminal of the comparator COMP1 is connected to the voltage signal generated based on the sensed current Isense and the resistor RS. Therefore, the comparator COMP1 can determine whether the sensed current Isense reaches the first preset value during the rise of the sensed current Isense. The timer 321 can time during the period when the comparator COMP1 outputs a low level and stop timing when the comparator COMP1 outputs a high level. Therefore, the timer 321 can record the duration of the rise of the sensed current Isense, and the logic circuit 322 determines whether the timing result of the timer 321 meets the requirements to calibrate the current detection module 20.

[0108] In some embodiments of the present application, for example, in the embodiment where the current detection and calibration module 30 can calibrate the current detection module 20 according to the duration of the rise of the sensed current Isense, refer to Figure 16 , Figure 16 Another schematic diagram of the switching power supply circuit in the embodiment of the present application is shown. Among them, the switching inductor module 10 further includes a second switch S2, and the second switch S2 is connected in parallel with the first inductor L1. The current detection and calibration module 30 calibrates the current detection module 20 according to the duration of the rise of the sensed current Isense. The second switch S2 is in an open state during the rise of the current Iin of the first inductor L1, and the second switch S2 is in a closed state during the fall of the current Iin of the first inductor L1.

[0109] It should be noted that when the current detection calibration module 30 calibrates the current detection module 20 according to the duration of the rising sensed current Isense, the first switch S1 is closed, and the second switch S2 and the first switch S1' are opened. At this time, the current Iin of the first inductor L1 and the sensed current Isense rise synchronously. Therefore, the current detection calibration module 30 can record the duration of the rising sensed current Isense and calibrate the current detection module 20 once (for example, change the number of parallel transistors of the first transistor M01); after completing the calibration of the current detection module 20 once, the first switch S1 is opened, and the second switch S2 and the first switch S1' are closed. At this time, the current Iin of the first inductor L1 and the sensed current Isense can quickly drop, so as to facilitate re-controlling the first switch S1 to be closed, the second switch S2 and the first switch S1' to be opened and performing the next calibration process of the current detection module 20, thereby improving the calibration efficiency of the current detection module 20.

[0110] In some embodiments of the present application, referring to Figure 17 , Figure 17 shows another schematic diagram of the switching power supply circuit in the embodiments of the present application. Among them, the current detection calibration module 30 further includes a driving unit 33; the driving unit 33 is used to control the first switch S1 and the second switch S2 according to the signal output by the timing unit 32.

[0111] It should be noted that the driving unit 33 may include a MOS transistor driving circuit such as a push-pull driving circuit. During the operation of the driving unit 33, the switching states of the first switch S1 and the second switch S2 are mutually exclusive. For example, when the current detection calibration module 30 calibrates the current detection module 20 according to the duration of the rising sensed current Isense, the driving unit 33 can control the first switch S1 to be closed, and the second switch S2 and the first switch S1' to be opened, so that the current Iin of the first inductor L1 rises; after completing the calibration of the current detection module 20 once, the driving unit 33 can control the first switch S1 to be opened, and the second switch S2 and the first switch S1' to be closed, so that the current Iin of the first inductor L1 quickly drops.

[0112] In some embodiments of the present application, for example, for the embodiment in which the switching inductor module 10 is controlled based on the peak current control mode, referring to Figure 18 , Figure 18 shows another schematic diagram of the switching power supply circuit in the embodiments of the present application. The switching power supply circuit further includes a voltage feedback module 40 and a control module 50. The current detection module 20, the voltage feedback module 40, and the control module 50 constitute the control circuit of the switching inductor module 10.

[0113] Specifically, the voltage feedback module 40 is configured to output an error signal Vea based on the second voltage VBST and a preset reference voltage Vref to form a voltage feedback loop in the peak current control mode. The voltage feedback module 40 includes a first feedback resistor RF1, a second feedback resistor RF2, and an error amplifier OP. The first end of the first feedback resistor RF1 is used to connect to the second voltage VBST. The second end of the first feedback resistor RF1 is connected to the first end of the second feedback resistor RF2. The second end of the second feedback resistor RF2 is connected to the ground terminal. The first input terminal of the error amplifier OP is connected to a first node m1 between the first feedback resistor RF1 and the second feedback resistor RF2. The second input terminal of the error amplifier OP is used to connect to the preset reference voltage Vref. The output terminal of the error amplifier OP is used to output the error signal Vea.

[0114] The control module 50 can output a control signal Vd according to the error signal Vea and the sensed current Isense to control the first switch S1 in the switched-inductor module 10 through the control signal Vd, and enable the switched-inductor module 10 to output the second voltage VBST according to the first voltage AVDD.

[0115] For example, taking Figure 18 the switched-inductor module 10 including a BOOST boost circuit as an example, when the voltage corresponding to the sensed current Isense is greater than the voltage of the error signal Vea, it indicates that the current Iin of the first inductor L1 has completed the rising process. Therefore, the control module 50 can output a control signal Vd with a low level and make the first switch S1 turn off. The first inductor L1 discharges and the current gradually decreases. The first voltage AVDD and the induced electromotive force of the first inductor L1 are superimposed. Since the induced electromotive force of the first inductor L1 is in the same direction as the first voltage AVDD, a second voltage VBST with a higher voltage can be output.

[0116] During the discharging process of the first inductor L1, since the voltage corresponding to the sensed current Isense is less than the voltage of the error signal Vea, when the rising edge of the clock signal arrives, the control module 50 can output a control signal Vd with a high level and make the first switch S1 turn on. Therefore, the first voltage AVDD charges the first inductor L1, the current of the first inductor L1 gradually rises, the first capacitor C1 discharges to output the second voltage VBST until the voltage corresponding to the sensed current Isense is greater than the voltage of the error signal Vea, and the above process is repeated.

[0117] As an exemplary embodiment, refer to Figure 18, the control module 50 includes a comparator COMP2 and a logic driving circuit; the first input terminal of the comparator COMP2 is used to access the error signal Vea, and the second input terminal of the comparator COMP2 is used to access the ramp signal Vramp generated based on the sensed current Isense; the first input terminal of the logic driving circuit is connected to the output terminal of the comparator COMP2, the second input terminal of the logic driving circuit is used to access the preset clock signal CLK, and the output terminal of the logic driving circuit is connected to the control terminal of the first switch S1.

[0118] In Figure 18 , the sensed current Isense flows through the resistor Rr into the ground terminal to generate the ramp signal Vramp. When the voltage of the ramp signal Vramp is greater than the voltage of the error signal Vea, the preset clock signal CLK is at a low level, the comparator COMP2 outputs a high-level signal, and the output terminal of the logic driving circuit can output a low-level signal to control the first switch S1 to turn off; after the first switch S1 is turned off, the comparator COMP2 outputs a low-level signal. When the rising edge of the preset clock signal CLK arrives, the output terminal of the logic driving circuit can output a high-level signal to control the first switch S1 to turn on.

[0119] It can be understood that the above is only an exemplary embodiment of the control module 50 of the present application. Those skilled in the art can make equivalent modification designs to the control module 50. For example, the logic driving circuit generally includes an RS flip-flop, but in some possible embodiments, logic circuits such as logic gates and flip-flops 322 can also be used to replace the RS flip-flop.

[0120] It should be noted that the above content about the switching power supply circuit is intended to clearly illustrate the implementation verification process of the present application. Those skilled in the art can make equivalent modification designs or further designs under the guidance of the present application. For example, the switching power supply circuit can also include a ramp compensation circuit that outputs a ramp compensation signal for the current to avoid the sub-harmonic oscillation phenomenon when the duty cycle of the PWM signal is greater than 50%.

[0121] To better implement the switching power supply circuit in the embodiments of the present application, on the basis of the switching power supply circuit, the present application also provides a power supply system. The power supply system includes the switching power supply circuit described in any of the above embodiments. Since the power supply system of the present application has the switching power supply circuit described in the above embodiments, it has all the beneficial effects of the switching power supply circuit in the above embodiments and will not be elaborated here.

[0122] To better implement the switching power supply circuit in the embodiments of the present application, on the basis of the switching power supply circuit, the present application also provides a power chip. Refer to Figure 19 , Figure 19FIG. 0 shows a schematic diagram of a power chip in an embodiment of the present application. The power chip is used to control a switched-inductor module 10, and the switched-inductor module 10 includes a first inductor L1 and a first switch S1. The first switch S1 is used to control the charging or discharging of the first inductor L1. The power chip includes:

[0123] A current detection module 20, which is configured to output a sense current Isense according to the current Iin of the first inductor L1. The magnitude of the sense current Isense is proportional to the magnitude of the current Iin of the first inductor L1.

[0124] A current detection calibration module 30, which is configured to calibrate the current detection module 20 so that a first ratio of the sense current Isense to the current Iin of the first inductor L1 is equal to a preset ratio.

[0125] Wherein, the current detection calibration module 30 calibrates the current detection module 20 according to the duration of the rise or fall of the sense current Isense.

[0126] Exemplarily, the power chip can be but is not limited to a SOC (System on Chip) chip or a SIP (system in package) chip. Since the power supply system of the present application has the current detection module 20 and the current detection calibration module 30 of the switched-mode power supply circuit described in the above embodiments, it has all the beneficial effects of the switched-mode power supply circuit in the above embodiments, which will not be elaborated here.

[0127] The embodiment of the present application further provides an electronic device, which includes a device main body and a power supply system as described above provided in the device main body. The electronic device can be but is not limited to a weighing scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a vehicle charger, an adapter, a display, a USB (Universal Serial Bus) expansion dock, a stylus, a true wireless earphone, a car center screen, a car, a smart wearable device, a mobile terminal, a smart home device. The smart wearable device includes but is not limited to a smart watch, a smart bracelet, and a cervical massager. The mobile terminal includes but is not limited to a smart phone, a laptop computer, a tablet computer, and a POS (point of sales terminal) machine. The smart home device includes but is not limited to a smart socket, a smart rice cooker, a smart sweeper, and a smart light.

[0128] The above are only the preferred embodiments of the present application and do not impose any formal restrictions on the present application. Although the present application has been disclosed above with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present application. However, as long as it does not depart from the content of the technical solution of the present application, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A switching power supply circuit, characterized in that, Comprising: A switched-inductor module, the switched-inductor module includes a first inductor and a first switch, and the first switch is used to control the charging or discharging of the first inductor; A current detection module, the current detection module is used to output a sensed current according to the current of the first inductor, and the magnitude of the sensed current is proportional to the magnitude of the current of the first inductor; A current detection calibration module, the current detection calibration module is used to calibrate the current detection module so that a first ratio of the sensed current to the current of the first inductor is equal to a preset ratio; Wherein, the current detection calibration module calibrates the current detection module according to the rising or falling duration of the sensed current.

2. The switching power supply circuit according to claim 1, wherein When a first duration for the sensed current to rise is not equal to a first preset duration, the current detection calibration module calibrates the current detection module until the first duration for the sensed current to rise is equal to the first preset duration; Or When a second duration for the sensed current to fall is not equal to a second preset duration, the current detection calibration module calibrates the current detection module until the second duration for the sensed current to fall is equal to the second preset duration.

3. The switching power supply circuit according to claim 1, wherein The current detection calibration module includes a comparison unit and a timing unit; The comparison unit is used to judge whether the sensed current reaches a first preset value during the rising of the sensed current, or is used to judge whether the sensed current reaches a second preset value during the falling of the sensed current; The timing unit is used to record the rising or falling duration of the sensed current in response to an enable signal output by the comparison unit.

4. The switching power supply circuit according to claim 3, wherein The switched-inductor module further includes a second switch, and the second switch is connected in parallel with the first inductor; Wherein, the second switch is in an open state during the rising of the current of the first inductor, and the second switch is in a closed state during the falling of the current of the first inductor.

5. The switching power supply circuit according to claim 4, wherein, The current detection calibration module further includes a driving unit; The driving unit is used to control the first switch and the second switch according to a signal output by the timing unit; Wherein, the switch states of the first switch and the second switch are mutually exclusive.

6. The switching power supply circuit according to claim 1, wherein The current detection module includes a first transistor; A first end of the first transistor is connected to the first inductor, and a control end of the first transistor is used to access a control signal.

7. The switching power supply circuit according to claim 6, wherein, The current detection calibration module is used to control the number of parallel transistors of the first transistor to calibrate the current detection module.

8. The switching power supply circuit according to claim 6, characterized in that, The current detection module further includes a current mirror unit; The current mirror unit is used to mirror the current flowing through the first transistor and output the sensed current.

9. The switching power supply circuit according to claim 8, wherein The current detection calibration module is used to control the number of parallel transistors of the first transistor to calibrate the current detection module; And / or The current detection calibration module is used to control the mirror ratio of the current mirror unit to calibrate the current detection module.

10. The switching power supply circuit according to claim 8, characterized in that, The current mirror unit includes a first resistor, a first current source, a second transistor, a second resistor, a second current source, a third transistor, a third resistor, a fourth transistor, a fifth transistor, and a sixth transistor; The first end of the first resistor is connected to the second end of the first transistor, and the second end of the first resistor is connected to the ground terminal; The input terminal of the first current source is connected to the power supply terminal, and the output terminal of the first current source is connected to the first end of the second transistor; The control terminal of the second transistor is connected to the control terminal of the third transistor. The first end of the second resistor is connected to the second end of the second transistor, and the second end of the second resistor is connected to the second end of the first transistor; The input terminal of the second current source is connected to the power supply terminal, the output terminal of the second current source is connected to the first end of the third transistor, and the first end of the third transistor is connected to the control terminal of the third transistor; The first end of the third resistor is connected to the second end of the third transistor, and the second end of the third resistor is connected to the ground terminal; The second end of the fifth transistor is connected to the power supply terminal, the control terminal of the fifth transistor is connected to the first end of the fifth transistor, and the first end of the fifth transistor is connected to the first end of the fourth transistor; The control terminal of the fourth transistor is connected to the first end of the second transistor, and the second end of the fourth transistor is connected to the second end of the third transistor; The second end of the sixth transistor is connected to the power supply terminal, the control terminal of the sixth transistor is connected to the control terminal of the fifth transistor, and the first end of the sixth transistor is used to output the sensed current.

11. The switching power supply circuit according to claim 10, wherein The current detection calibration module is used to control the number of parallel transistors of the first transistor to calibrate the current detection module; and / or The current detection calibration module is used to control the magnitude of the first resistor to calibrate the current detection module; and / or The current detection calibration module is used to control the magnitudes of the second resistor and the third resistor to calibrate the current detection module; and / or The current detection calibration module is used to control the mirror ratio of the fifth transistor and the sixth transistor to calibrate the current detection module.

12. The switching power supply circuit according to claim 2, wherein, The current detection calibration module controls the first ratio between the sensed current and the current of the first inductor according to a preset rule to calibrate the current detection module; The preset rule includes increasing the first ratio when updating the first ratio for the Nth time, and decreasing the first ratio when updating the first ratio for the (N + 1)th time; or, The preset rule includes increasing the first ratio when updating the first ratio for the Nth time, and increasing the first ratio when updating the first ratio for the (N + 1)th time; or The preset rule includes decreasing the first ratio when updating the first ratio for the Nth time, and decreasing the first ratio when updating the first ratio for the (N + 1)th time; wherein, N is any integer greater than or equal to 1.

13. A power supply system, characterized in that, Including the switching power supply circuit according to any one of claims 1 to 12.

14. A power chip, characterized in that, The power supply chip is used to control the switching inductor module. The switching inductor module includes a first inductor and a first switch. The first switch is used to control the charging or discharging of the first inductor. The power supply chip includes: A current detection module, which is configured to output a sensed current according to the current of the first inductor, and the magnitude of the sensed current is proportional to the magnitude of the current of the first inductor; A current detection calibration module, which is configured to calibrate the current detection module so that a first ratio of the sensed current to the current of the first inductor is equal to a preset ratio; Wherein, the current detection calibration module calibrates the current detection module according to the duration of the rise or fall of the sensed current.

15. An electronic device, characterized in that, It includes the power supply system according to claim 13 or the chip according to claim 14.

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