Multi-phase Buck converter, chip and electronic equipment

Abstract

The embodiment of the utility model provides a multi-phase Buck converter, a chip and electronic equipment. The multi-phase Buck converter at least comprises a voltage-current converter, a phase control module, and control circuits and current comparators corresponding to phase circuits in the multi-phase Buck converter, the input end of the control circuit is connected with the output ends of the voltage-current converter and the phase control module and is used for receiving a first current determined by the voltage-current converter based on the control voltage of the multi-phase Buck converter and a current corresponding to the number of working phases determined by the phase control module based on the inductive current of each phase circuit so as to determine a control current; the output end of the control circuit is connected with the normal phase input end of the current comparator and used for outputting control current to the current comparator, so that when the control current is smaller than or equal to the inductive current of the corresponding phase circuit, the control circuit outputs a corresponding level signal to the phase circuit, the phase working state is switched, the control voltage fluctuation during phase cutting is reduced, and the stability is improved.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of power electronic converters, and in particular to a multi-phase Buck converter, a chip, and an electronic device. Background Art

[0002] A multiphase Buck converter, also known as a multiphase step-down converter, is a power electronic circuit primarily used to convert DC voltage to a lower DC voltage. By connecting multiple identical Buck modules in parallel and operating them simultaneously in different phases, the overall power density and efficiency of the circuit are improved. In a multiphase Buck converter application, if the load current is low, it can use fewer phases to improve efficiency; if the load current is high, it can use more phases to ensure sufficient load capacity. This shows that a multiphase Buck converter can autonomously adjust the number of phases in operation based on the load current. This process is called phase shedding.

[0003] However, current multiphase Buck converters experience significant fluctuations in the control voltage during phase shedding, which increases the stabilization time of the control voltage and prolongs the phase shedding process. This control voltage is used to control the operating phase of the multiphase Buck converter, synchronizing and coordinating the operation of the individual power switches within the converter.

[0004] Therefore, providing a multi-phase Buck converter to reduce the control voltage fluctuation and improve the stability of the control voltage during phase cutting has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, embodiments of the present invention provide a multi-phase Buck converter, a chip, and an electronic device to reduce control voltage fluctuations and improve control voltage stability during phase shedding.

[0006] To solve the above problems, the embodiments of the present invention provide the following technical solutions.

[0007] In a first aspect, an embodiment of the present invention provides a multi-phase Buck converter, comprising at least: a voltage-to-current converter, a phase control module, and a control circuit and a current comparator corresponding to each phase circuit in the multi-phase Buck converter;

[0008] The input end of the control circuit is connected to the output end of the voltage-to-current converter and the output end of the phase control module, and is used to receive a first current and the number of working phases corresponding to the multi-phase Buck converter, so as to determine a control current based on a current difference between the first current and the number of working phases; wherein the first current is determined by the voltage-to-current converter based on the control voltage of the multi-phase Buck converter, and the number of working phases is determined by the phase control module based on the inductor current of each phase circuit;

[0009] The output end of the control circuit is connected to the non-phase input end of the current comparator, and is used to output the control current to the current comparator, so that when the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to the phase circuit, so as to switch the phase working state of the corresponding phase circuit.

[0010] Optionally, the control circuit includes a positive current unit and a negative current unit;

[0011] The forward current unit is configured to receive the first current;

[0012] The negative current unit is used to receive the number of working phases, determine a control current according to a current difference between the first current and the number of working phases, and output the control current to the current comparator.

[0013] Optionally, the forward current unit includes: a first field effect transistor and a second field effect transistor;

[0014] The source of the first field-effect transistor and the source of the second field-effect transistor are respectively connected to the system power supply, the gate of the first field-effect transistor is connected to the gate of the second field-effect transistor, and the drain of the first field-effect transistor is connected to the output end of the voltage-to-current converter for receiving the first current, and the first node on the connecting branch between the source of the first field-effect transistor and the output end of the voltage-to-current converter is connected to the second node on the connecting branch between the gate of the first field-effect transistor and the gate of the second field-effect transistor.

[0015] Optionally, the negative current unit includes: a first bias circuit, a second bias circuit, a third bias circuit and a fourth bias circuit connected in parallel;

[0016] The first bias circuit corresponds to the first number of working phases and includes a first bias device, the first bias device is used to provide a first bias current, and the negative electrode of the first bias device is connected to the system ground terminal;

[0017] The second bias circuit corresponds to the second number of working phases and includes a second bias device and a third field effect transistor, the second bias device is used to provide a second bias current, the source of the third field effect transistor is connected to the negative electrode of the second bias device, the drain is connected to the system ground terminal, and the gate is connected to the output terminal of the phase control module that outputs the second number of working phases;

[0018] The third bias circuit corresponds to the third number of working phases and includes a third bias device and a fourth field effect transistor. The third bias device is used to provide a third bias current. The source of the fourth field effect transistor is connected to the negative electrode of the third bias device, the drain is connected to the system ground terminal, and the gate is connected to the output terminal of the phase control module that outputs the third number of working phases.

[0019] The fourth bias circuit corresponds to the fourth number of working phases, and includes a fourth bias device and a fifth field-effect transistor. The fourth bias device is used to provide a fourth bias current. The source of the fifth field-effect transistor is connected to the negative electrode of the fourth bias device, the drain is connected to the system ground terminal, and the gate is connected to the output terminal of the phase control module that outputs the fourth number of working phases.

[0020] A third node on a connecting branch where the positive electrodes of the first bias device, the second bias device, the third bias device, and the fourth bias device are connected in parallel is connected to a fourth node on a connecting branch where the drain of the second field-effect transistor is connected to the input end of the current comparator, and is configured to determine a control current based on a current difference between the first current and the current corresponding to the number of working phases, and output the control current to the current comparator.

[0021] Optionally, the system further includes: an inductor current sampling module corresponding to each phase circuit in the multi-phase Buck converter, wherein the inductor current sampling module is configured to sample the inductor current of the phase circuit based on the working state of the corresponding phase circuit;

[0022] The output end of the inductor current sampling module is connected to the negative phase input end of the current comparator, so that the current comparator compares the sampled inductor current of the corresponding phase circuit with the control current, and outputs a level signal for flipping between a low level and a high level when the inductor current of the corresponding phase circuit is greater than or equal to the control current.

[0023] Optionally, the current comparator includes: a sixth field effect transistor, a seventh field effect transistor, an eighth field effect transistor, a ninth field effect transistor, a tenth field effect transistor, an eleventh field effect transistor, a first resistor, a second resistor, and a third resistor;

[0024] Wherein, the source of the sixth field-effect transistor is connected to the system power supply, the drain of the sixth field-effect transistor is connected to the source of the seventh field-effect transistor, the drain of the seventh field-effect transistor is connected to the source of the eighth field-effect transistor, the drain of the eighth field-effect transistor is connected to the positive electrode of the first resistor, the negative electrode of the first resistor is connected to the system ground, and the gate of the sixth field-effect transistor is connected to the gate of the seventh field-effect transistor, and the gate of the eighth field-effect transistor is connected to the output terminal of the control circuit;

[0025] The source of the ninth field-effect transistor is connected to the system power supply, the drain of the ninth field-effect transistor is connected to the source of the tenth field-effect transistor, the drain of the tenth field-effect transistor is connected to the source of the eleventh field-effect transistor, the drain of the eleventh field-effect transistor is connected to the positive electrode of the second resistor, the negative electrode of the second resistor is connected to the system ground, and the gate of the ninth field-effect transistor is connected to the gate of the sixth field-effect transistor, the gate of the tenth field-effect transistor is connected to the gate of the seventh field-effect transistor, and the gate of the eleventh field-effect transistor is connected to the output end of the inductor current sampling module;

[0026] In which, a third resistor is connected between the fifth node on the connecting branch between the drain of the seventh field effect transistor and the source of the eighth field effect transistor and the sixth node on the connecting branch between the drain of the tenth field effect transistor and the source of the eleventh field effect transistor; and the control current received by the current comparator flows from the fifth node through the third resistor and is transmitted to the sixth node.

[0027] Optionally, the output end of the inductor current sampling module is also connected to the input end of the phase control module, so that the phase control module adjusts the number of phases in the working state in the multi-phase Buck converter according to the inductor current provided by each phase circuit, and determines the number of working phases that meets the current load requirement of the multi-phase Buck converter.

[0028] Optionally, the phase control module includes: a phase comparator corresponding to each phase circuit in the multi-phase Buck converter, and bias comparators corresponding to the second bias circuit, the third bias circuit, and the fourth bias circuit respectively;

[0029] The positive phase input of the phase comparator is connected to the output of the inductor current sampling module, the negative phase input of the phase comparator receives the control voltage of the multi-phase Buck converter, and the outputs of the phase comparators are connected in parallel to determine the comparison voltage of the corresponding multi-phase Buck converter; the positive phase inputs of the bias comparators are connected in parallel, and the parallel phase comparators are connected to the parallel bias comparators so that the positive phase input of the bias comparator receives the comparison voltage, wherein the negative phase input of the bias comparator receives a reference voltage for comparison with the comparison voltage, so that the bias comparator outputs a corresponding level control signal based on the comparison result.

[0030] Optionally, the multi-phase Buck converter further includes a feedback network and an error amplifier, wherein the output end of the feedback network is connected to the negative input end of the error amplifier, and is used to output the sampled output voltage of the multi-phase Buck converter to the error amplifier, so that the error amplifier compares the output voltage of the multi-phase Buck converter with a reference voltage and outputs a control voltage; the output end of the error amplifier is connected to the input end of the voltage-to-current converter, and is used to output the control voltage to the voltage-to-current converter, so that the voltage-to-current converter determines the first current based on the control voltage, where the first current is specifically the feedback current;

[0031] A filter capacitor and a load resistor are connected in parallel to a seventh node on a branch connecting the negative phase input terminal of the error amplifier and the output terminal of the feedback network.

[0032] Optionally, the phase circuit in the multi-phase Buck converter includes: a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube connected in series in sequence, and a first capacitor connected to an eighth node on a branch connecting the first switching tube and the second switching tube, a first inductor connected to a ninth node on a branch connecting the third switching tube and the fourth switching tube, and a tenth node on a branch connecting the ninth node and the first inductor is connected to the negative electrode of the first capacitor;

[0033] Among them, each phase circuit is connected in parallel based on the eleventh node on the connection branch between the second switching tube and the third switching tube, and the twelfth node on the connection branch where each phase circuit is connected in parallel is connected to the positive electrode of the second capacitor, and the negative electrode of the second capacitor is connected to the ground end.

[0034] In a second aspect, an embodiment of the present invention provides a chip, comprising the multi-phase Buck converter described in the first aspect.

[0035] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising the chip as described in the second aspect.

[0036] In the multi-phase Buck converter, chip, and electronic device provided by the embodiments of the present invention, the multi-phase Buck converter includes at least a voltage-current converter, a phase control module, and a control circuit and a current comparator corresponding to each phase circuit in the multi-phase Buck converter. The control circuit is connected to the output of the voltage-current converter and the output of the phase control module via an input end of the control circuit, and is used to receive a first current and the number of working phases of the multi-phase Buck converter, so as to determine a control current based on a current difference between the first current and the number of working phases. The first current is determined by the voltage-current converter based on the control voltage of the multi-phase Buck converter, and the number of working phases is determined by the phase control module based on the inductor current of each phase circuit. The output end of the control circuit is connected to the non-inverting input end of the current comparator, so as to output the control current to the current comparator, so that when the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to the phase circuit to switch the phase working state of the corresponding phase circuit.

[0037] It can be seen that the multi-phase Buck converter of the embodiment of the present invention determines the control current by the control circuit based on the first current input by the voltage-to-current converter and the current difference corresponding to the number of working phases of the multi-phase Buck converter determined by the phase control module according to the inductor current of each phase circuit, so that the control current does not need to be determined by the output voltage, thereby avoiding the influence of the output voltage of the multi-phase Buck converter. Furthermore, the control circuit can output the control current to the current comparator of each phase circuit in the corresponding multi-phase Buck converter, so that when the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to switch the phase working state of the corresponding phase circuit, thereby reducing the control voltage fluctuation during phase cutting, thereby reducing the stabilization time of the control voltage and improving the stability of the control voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0039] Figure 1 Schematic diagram of an optional structure of a multi-phase Buck converter provided in an embodiment of the present utility model;

[0040] Figure 2Schematic diagram of an optional structure of a control circuit provided in an embodiment of the present utility model;

[0041] Figure 3 To correspond Figure 2 Schematic diagram of current transmission direction of T4 node;

[0042] Figure 4 A schematic diagram of another optional structure of the multi-phase Buck converter provided in an embodiment of the present utility model;

[0043] Figure 5 A schematic diagram of an optional structure of a phase control module provided in an embodiment of the present utility model;

[0044] Figure 6 A schematic diagram of a curve showing a change in the control current IVC required for mode switching of a 16-phase Buck converter provided by an embodiment of the present invention;

[0045] Figure 7 A schematic diagram of an optional structure of a current comparator provided in an embodiment of the present utility model;

[0046] Figure 8 A schematic diagram of the change curves of the control voltage VC and the control current IVC when a multi-phase Buck converter according to an embodiment of the present invention undergoes phase shedding;

[0047] Figure 9 A schematic diagram of the change curves of the control voltage VC and the control current IVC when a phase shedding action occurs in another multi-phase Buck converter provided by an embodiment of the present invention;

[0048] Figure 10 This is a simulation diagram of the test results of the control voltage VC and output voltage Vout of Buck1 and Buck2 provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0049] When a multiphase Buck converter is used, if the load current is low, it can use fewer phases to improve efficiency. If the load current is high, it can use more phases to ensure sufficient load capacity. A multiphase Buck converter can autonomously adjust the number of active phases based on the load current. This process is called phase shedding.

[0050] The inventors have discovered that for a multi-phase Buck converter, when the number of phases in its operation changes, the voltage signal output by the multi-phase Buck converter fluctuates, requiring adjustment of the control voltage before and after the multi-phase Buck converter switches phase. However, during the process of adjusting the control voltage of the multi-phase Buck converter, the adjustment speed of the control voltage is limited by the error amplifier, which in turn causes the control voltage to fluctuate significantly during the phase switching process. Moreover, the limited adjustment speed of the control voltage also prolongs the phase switching process of the multi-phase Buck converter. Therefore, if the multi-phase Buck converter can determine the control current based on the corresponding operating phase and output voltage during phase switching, and thus control the voltage signal of the operating phase of the multi-phase Buck converter based on the control current, not only can the influence of the output voltage be avoided, but also the fluctuation of the control voltage can be reduced, the stabilization time of the control voltage can be shortened, and the stability of the control voltage can be improved.

[0051] Based on the above-mentioned inventive concepts, the embodiments of the present invention provide a multi-phase Buck converter, chip, and electronic device. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0052] As an optional implementation of the disclosure of the present invention, the present invention provides a multi-phase Buck converter, such as Figure 1 The schematic diagram of an optional multiphase Buck converter is shown. The multiphase Buck converter may include at least: a voltage-to-current converter 01, a phase control module 02, a control circuit 03, and a current comparator 04. The control circuit and current comparator may be configured to correspond to each phase circuit in the multiphase Buck converter. The multiphase Buck converter of the embodiment of the present invention may be a multiphase Buck converter under peak current mode control.

[0053] The voltage-to-current converter may be a device that converts voltage into current, such as a voltage-to-current converter, or may be other types of voltage-to-current conversion devices, which is not limited in this embodiment.

[0054] The phase control module can be understood as a module that controls the number of working phases of the multi-phase Buck converter and performs phase switching on the multi-phase Buck converter. For example, for a 16-phase Buck converter, based on the control of the phase control module, its working phase circuit can be switched from 4 phases to 8 phases, or from 8 phases to 12 phases, or from 12 phases to 16 phases.

[0055] The control circuit can be understood as a circuit that determines the control current of the corresponding phase circuit. As an optional implementation, the control current determined by the control circuit can be determined based on the current control voltage of the multi-phase Buck converter and the number of operating phases of the corresponding multi-phase Buck converter.

[0056] The current comparator may be a device for comparing a control current determined by a control circuit of a corresponding phase circuit with an inductor current of the phase circuit, thereby outputting a level signal related to a working state of the phase circuit.

[0057] As an optional implementation, in the multi-phase Buck converter of an embodiment of the present utility model, the input end of the control circuit is connected to the output end (IVC_IN end) of the voltage-current converter and the output end (EN end) of the phase control module, and is used to receive the first current and the number of working phases of the multi-phase Buck converter, so as to determine the control current (IVC) based on the current difference corresponding to the first current and the number of working phases. The first current can be determined by the voltage-current converter based on the control voltage of the multi-phase Buck converter. In a specific example, the first current can be a feedback current. The number of working phases of the multi-phase Buck converter can be determined by the phase control module based on the inductor current of each phase circuit. In a specific example, the current corresponding to the number of working phases of the multi-phase Buck converter can be a bias current.

[0058] The output end of the control circuit is connected to the non-phase input end of the current comparator, and is used to output the control current to the current comparator, so that when the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to switch the phase working state of the corresponding phase circuit.

[0059] It can be seen that the multi-phase Buck converter of the embodiment of the present invention determines the control current by the control circuit based on the first current input by the voltage-to-current converter and the current difference corresponding to the number of working phases of the multi-phase Buck converter determined by the phase control module according to the inductor current of each phase circuit, so that the control current does not need to be determined by the output voltage, thereby avoiding the influence of the output voltage of the multi-phase Buck converter. Furthermore, the control circuit can output the control current to the current comparator of each phase circuit in the corresponding multi-phase Buck converter, so that when the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to switch the phase working state of the corresponding phase circuit, thereby reducing the control voltage fluctuation during phase cutting, thereby reducing the stabilization time of the control voltage and improving the stability of the control voltage.

[0060] In some embodiments, in order to implement the control circuit to determine the control current in the multi-phase Buck converter, Figure 2 The following is an exemplary diagram showing an optional structural diagram of the control circuit in the embodiment of the present utility model. Figure 2 As shown, the control circuit may include a positive current unit 10 and a negative current unit 20 .

[0061] The forward current unit 10 is used to receive a first current.

[0062] The negative current unit 20 is used to receive the number of working phases of the multi-phase Buck converter, determine the control current according to the current difference between the first current and the number of working phases, and output the control current to the current comparator.

[0063] Continue to see Figure 2 As shown, as an optional implementation, the forward current unit 10 may include a first field effect transistor M1 and a second field effect transistor M2. In a specific example, the first field effect transistor M1 and the second field effect transistor M2 may be NMOS transistors.

[0064] In an optional example in which the first field-effect transistor M1 and the second field-effect transistor M2 are NMOS transistors, the source of the first field-effect transistor M1 and the source of the second field-effect transistor M2 can be connected to the system power supply VDD respectively, the gate of the first field-effect transistor M1 is connected to the gate of the second field-effect transistor M2, and the drain of the first field-effect transistor M1 is connected to the output terminal IVC_IN of the voltage-to-current converter for receiving the first current, and the first node T1 located on the connecting branch between the source of the first field-effect transistor M1 and the output terminal IVC_IN of the voltage-to-current converter is connected to the second node T2 located on the connecting branch between the gate of the first field-effect transistor M1 and the gate of the second field-effect transistor.

[0065] As an optional implementation, the negative current unit 20 may include a first bias circuit 21 , a second bias circuit 22 , a third bias circuit 23 and a fourth bias circuit 24 connected in parallel.

[0066] In a specific example, the first bias circuit 21 may correspond to a first number of operating phases of a multi-phase Buck converter and include a first bias circuit IBIAS1 configured to provide a first bias current, with a negative electrode of the first bias circuit connected to a system ground terminal SGND. In the example of a 16-phase Buck converter, the first number of operating phases corresponding to the first bias circuit may be, for example, four operating phases, and the first bias current provided by the first bias circuit IBIAS1 may be, for example, a bias current corresponding to four phases.

[0067] The second bias circuit 22 can correspond to the second number of working phases of the multi-phase Buck converter, and includes a second bias device IBIAS2 and a third field-effect transistor M3. The second bias device IBIAS2 is used to provide a second bias current. The source of the third field-effect transistor M3 is connected to the negative electrode of the second bias device IBIAS2, the drain is connected to the system ground terminal SGND, and the gate is connected to the output terminal of the phase control module, such as EN8, which outputs the second number of working phases. In the example of a 16-phase Buck converter, the second number of working phases corresponding to the second bias circuit can be, for example, 8 phases in an operating state, and the second bias current provided by the second bias device IBIAS2 can be, for example, a bias current corresponding to the 8 phases.

[0068] The third bias circuit 23 can correspond to the third number of working phases of the multi-phase Buck converter, and includes a third bias device IBIAS3 and a fourth field-effect transistor M4. The third bias device IBIAS3 is used to provide a third bias current. The source of the fourth field-effect transistor is connected to the negative electrode of the third bias device IBIAS3, the drain is connected to the system ground terminal SGND, and the gate is connected to the output terminal of the phase control module, such as EN12, which outputs the third number of working phases. In the example of a 16-phase Buck converter, the third number of working phases corresponding to the third bias circuit can be, for example, 12 phases in the working state, and the third bias current provided by the third bias device IBIAS3 can be, for example, a bias current corresponding to the 12 phases.

[0069] The fourth bias circuit 24 can correspond to the fourth number of working phases of the multi-phase Buck converter, and includes a fourth bias device IBIAS4 and a fifth field-effect transistor M5. The fourth bias device IBIAS4 is used to provide a fourth bias current. The source of the fifth field-effect transistor M5 is connected to the negative electrode of the fourth bias device IBIAS4, the drain is connected to the system ground terminal SGND, and the gate is connected to the output terminal of the phase control module, such as EN16, which outputs the fourth number of working phases. In the example of a 16-phase Buck converter, the fourth number of working phases corresponding to the fourth bias circuit can be, for example, the number of 16 phases in the working state, and the fourth bias current provided by the fourth bias device IBIAS4 can be, for example, the bias current corresponding to the number of 16 phases.

[0070] A third node T3 on a connecting branch where the positive electrodes of the first bias device, the second bias device, the third bias device, and the fourth bias device are connected in parallel is connected to a fourth node T4 on a connecting branch where the drain of the second field-effect transistor M2 is connected to the input terminal IVC of the current comparator, for determining a control current based on a difference between the first current and the current corresponding to the number of working phases, and outputting the control current to the current comparator. In the case where the negative current unit includes multiple bias circuits connected in parallel, the current corresponding to the number of working phases of the multi-phase Buck converter can be specifically a bias current.

[0071] In an alternative example, Figure 3 The corresponding Figure 2 Schematic diagram of current transmission direction of node T4 in , it can be seen that at node T4, the first current IVC_IN is a positive current, and the current IBIAS corresponding to the number of working phases of the multi-phase Buck converter is a negative current. Therefore, based on the current difference between the first current and the current corresponding to the number of working phases of the multi-phase Buck converter, the control current IVC can be determined at node T4 and output to the current comparator.

[0072] It should be noted that in the multi-phase Buck converter of the embodiment of the present invention, the number of phase circuits corresponding to each bias circuit is the same, and the same number of phase circuits is composed of a corresponding number of adjacent phase circuits. The corresponding number of adjacent phase circuits can operate simultaneously or stop operating simultaneously. Moreover, in the multi-phase Buck converter of the embodiment of the present invention, the phase circuits corresponding to the first number of working phases can always be in an operating state. In a specific example, the third field-effect transistor M3, the fourth field-effect transistor M4, and the fifth field-effect transistor M5 can be NMOS transistors serving as enable transistors, and their control signals default to a low level, turning off the NMOS transistor. If the NMOS transistor is turned off, its corresponding bias circuit does not operate, and no bias current flows in the bias circuit corresponding to the NMOS transistor.

[0073] Taking a 16-phase Buck converter as an example, in a 16-phase Buck converter, each adjacent four phases can operate simultaneously or stop operating simultaneously. Therefore, the phase circuit corresponding to the first number of operating phases can be a phase circuit for phases 1 to 4, and these phases 1-4 are always in operation. Specifically, when the 16-phase Buck converter needs to switch from 4-phase operation to 8-phase operation, the control signal of EN8 flips from a low level to a high level, IBIAS2 operates, and transmits its corresponding bias current in the negative current unit; when the 16-phase Buck converter needs to switch from 8-phase operation to 12-phase operation, the control signal of EN12 flips from a low level to a high level, IBIAS3 operates, and transmits its corresponding bias current in the negative current unit; when the 16-phase Buck converter needs to switch from 12-phase operation to 16-phase operation, the control signal of EN16 flips from a low level to a high level, IBIAS4 operates, and transmits its corresponding bias current in the negative current unit.

[0074] It should be further explained that the number of bias circuits included in the negative current unit of the control circuit in the embodiment of the present invention can be set according to the number of phases of the multi-phase Buck converter based on design requirements. For example, one bias circuit corresponds to four phase circuits, and the corresponding number of phase circuits are stacked in the order of the bias circuits. Figure 2 The negative current unit including four bias circuits is only taken as an example for illustration, which should not limit the negative current unit of the control circuit in the multi-phase Buck converter of the embodiment of the present invention.

[0075] In the embodiment of the present utility model, only Figure 2 The structure of the control circuit shown is described as an example, but is not limited thereto. As long as the circuit structure can realize the function of the control circuit in the embodiment of the present invention, it is within the protection scope of the present invention and will not be described in detail here.

[0076] In some embodiments, Figure 4 Another optional structural diagram of the multi-phase Buck converter according to the embodiment of the present invention is shown as an example. Figure 4 As shown, the multi-phase Buck converter of the present invention may further include an inductor current sampling module 05. The inductor current sampling module may be configured to correspond to each phase circuit in the multi-phase Buck converter, and is configured to sample the inductor current of the corresponding phase circuit based on the operating state of the corresponding phase circuit.

[0077] As an optional implementation, the output end of the inductor current sampling module 05 can be connected to the negative phase input end of the current comparator 04, so that the current comparator 04 compares the inductor current of the corresponding phase circuit with the control current, and outputs a level signal for flipping between a low level and a high level when the inductor current of the corresponding phase circuit is greater than or equal to the control current, thereby adjusting the working state of the corresponding phase circuit and ensuring that the device is not damaged.

[0078] In a specific implementation, the phase circuit of the multi-phase Buck converter of the embodiment of the present utility model can be based on a power switch tube. Figure 4 As shown, the phase circuit of the multi-phase Buck converter may include: a first switch tube S1, a second switch tube S2, a third switch tube S3, and a fourth switch tube S4 connected in series in sequence, and a first capacitor C1 connected to an eighth node T8 on a branch connecting the first switch tube S1 and the second switch tube S2, a first inductor L1 connected to a ninth node T9 on a branch connecting the third switch tube S3 and the fourth switch tube S4, and a tenth node T10 on a branch connecting the ninth node T9 and the first inductor L1 is connected to the negative electrode of the first capacitor C1.

[0079] Furthermore, the corresponding multi-phase Buck converter includes a multi-phase circuit, wherein each phase circuit can be connected in parallel based on an eleventh node T11 on a connection branch between the second switch tube S2 and the third switch tube S3 thereof, and a twelfth node T12 on a connection branch where each phase circuit is connected in parallel is connected to the positive electrode of the second capacitor C2, and the negative electrode of the second capacitor C2 is connected to the ground end.

[0080] It should be noted that each switch in the phase circuit can be specifically a power switch, and its control signal defaults to a high level switch-on. When the level signal output by the current comparator flips from a high level to a low level, the switch in the phase circuit can be driven to enter the off time TOFF. In addition, to balance the voltage fluctuations in the phase circuit and reduce the impact on the switch, the first capacitor C1 in the phase circuit can be an external capacitor CFLY that performs filtering and energy storage functions. Figure 4 A circuit with 16 phases (X16) is taken as an example.

[0081] It should be further explained that each phase circuit in the multi-phase Buck converter of the embodiment of the present invention can be driven by pulse width modulation (PWM) to adjust the working state. In order to realize the driving of the phase circuit, Figure 4 As shown, the multi-phase Buck converter of the embodiment of the present invention may further include a logic drive module 06 corresponding to the phase circuit, and the input end of the logic drive module is connected to the output end of the current comparator, and the output end of the logic drive module is connected to the corresponding phase circuit, so that the current comparator can send the output level signal to the logic drive module, so that the logic drive module drives the switch tube in the phase circuit to enter the off time or the on time based on the corresponding level signal, thereby realizing the phase working state of the switching phase circuit.

[0082] In some embodiments, the multi-phase Buck converter of the present invention may further include a feedback network 07 and an error amplifier 08, wherein the output end of the feedback network 07 is connected to the negative input end of the error amplifier 08, and is used to output the sampled output voltage Vout of the multi-phase Buck converter to the error amplifier, so that the error amplifier compares the output voltage Vout of the multi-phase Buck converter with the reference voltage Vref and outputs a control voltage.

[0083] The output of the error amplifier 08 is connected to the input of the voltage-to-current converter 01, and is configured to output the control voltage to the voltage-to-current converter, so that the voltage-to-current converter determines the first current based on the control voltage. The first current obtained based on the control voltage can be a feedback current that reflects the output voltage.

[0084] Among them, the seventh node T7 on the connecting branch between the negative phase input terminal of the error amplifier 08 and the output terminal of the feedback network 07 is connected to a parallel filter capacitor CO and a load resistor RLOAD to enhance the reliability and stability of the error amplifier 08 and suppress the noise of the output voltage.

[0085] It should be noted that in order to effectively ensure the stability of the control voltage output by the error amplifier and the stability of the feedback current determined by the voltage-to-current converter, the multi-phase Buck converter of the embodiment of the present invention may also include an RC compensation network (not shown in the figure) based on a parallel or series configuration of a resistor R and a capacitor C and a slope compensation module 09. After the error between the output voltage Vout and the reference voltage Vref is amplified by the error amplifier, the voltage is compensated by the RC compensation network to offset the influence of the poles and zeros to obtain a stable control voltage VC. The control voltage VC can then be processed by the voltage-to-current converter and superimposed with the slope compensation current Islope of the slope compensation module 09 to obtain a feedback current to eliminate current oscillations.

[0086] Continue to refer to Figure 4 As shown, as another optional implementation, the output end of the inductor current sampling module 05 is further connected to the input end of the phase control module 02, so that the phase control module 02 adjusts the number of phases in the multi-phase Buck converter in the working state according to the inductor current provided by each phase circuit, determines the number of working phases that meets the current load requirement of the multi-phase Buck converter, and outputs it.

[0087] Optional, Figure 5 The following is an exemplary diagram showing an optional structural diagram of the phase control module in an embodiment of the present utility model. Figure 5 As shown, the phase control module may include a phase comparator (gm) corresponding to each phase circuit in the multi-phase Buck converter, and bias comparators (EN8', EN12' and EN16') corresponding to the second bias circuit, the third bias circuit and the fourth bias circuit respectively.

[0088] It should be noted that Figure 5 The phase control module shown is illustrated by controlling 16-phase phase circuits, where one phase circuit corresponds to one phase comparator, and every four-phase phase circuits correspond to a bias circuit, and the bias circuit corresponds to one bias comparator. This does not limit the specific structure of the phase control module of the embodiment of the present invention.

[0089] The positive-phase input of the phase comparator is connected to the output of the inductor current sampling module, and a corresponding voltage (sense_p) is determined based on the inductor current output by the inductor current sampling module. The negative-phase input of the phase comparator receives the output voltage Vout of the multi-phase Buck converter. The outputs of the phase comparators are connected in parallel to determine the comparison voltage VCOMP of the corresponding multi-phase Buck converter. Furthermore, the positive-phase inputs of the bias comparators are connected in parallel, and the parallel phase comparators are connected to the parallel bias comparators so that the positive-phase input of the bias comparator receives the comparison voltage. The negative-phase input of the bias comparator receives a reference voltage Vref for comparison with the comparison voltage VCOMP, so that the bias comparator outputs a corresponding level control signal based on the comparison result.

[0090] It should be noted that the node Tx on the parallel connection branch of each phase comparator is connected to the positive electrode of a resistor Rx, and the negative electrode of the resistor Rx is grounded, so that the components of the phase control module are protected from damage based on the resistor Rx.

[0091] It is understandable that when a multi-phase Buck converter switches phase, the control current IVC required in different phase modes is different based on the control of the phase control module. To understand the change in control current, take the example of switching the working phase of a 16-phase Buck converter from 4 phases to 8 phases. Figure 6 The following is an example diagram showing the change curve of the control current IVC required by the 16-phase Buck converter during mode switching, wherein the load current is the same when the working phase is 4 phases and when the working phase is 8 phases. Figure 6 As shown, when the operating phase of the 16-phase Buck converter switches from 4 phases to 8 phases, the inductor current I8 of each phase will be reduced from I4 to half of the original value, that is, I8 = 0.5 * I4. Corresponding to the reduction in the inductor current, the control current IVC needs to be reduced in the same manner. It can be determined that the 4-phase inductor current I4 when the phase cutting action occurs is determined by the phase control module. When the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to switch the phase operating state of the corresponding phase circuit. Based on the switching of the phase operating state of the phase circuit by the current comparator, it can be determined that the current comparator plays a decisive role in the degree of reduction of the control current IVC.

[0092] In some embodiments, to implement the comparison between the control current and the inductor current by the current comparator, Figure 7 The following is an exemplary diagram showing an optional structure of the current comparator in the embodiment of the present utility model. Figure 7As shown, the current comparator 04 may include: a sixth field-effect transistor M6, a seventh field-effect transistor M7, an eighth field-effect transistor M8, a ninth field-effect transistor M9, a tenth field-effect transistor M10, an eleventh field-effect transistor M11, a first resistor R1, a second resistor R2, and a third resistor R3. In a specific example, the sixth field-effect transistor M6, the seventh field-effect transistor M7, the eighth field-effect transistor M8, the ninth field-effect transistor M9, the tenth field-effect transistor M10, and the eleventh field-effect transistor M11 may be NMOS transistors.

[0093] The source of the sixth field-effect transistor M6 is connected to the system power supply VDD, the drain of the sixth field-effect transistor M6 is connected to the source of the seventh field-effect transistor M7, the drain of the seventh field-effect transistor M7 is connected to the source of the eighth field-effect transistor M8, the drain of the eighth field-effect transistor M8 is connected to the positive electrode of the first resistor R1, the negative electrode of the first resistor R1 is connected to the system ground SGND, and the gate of the sixth field-effect transistor M6 is connected to the gate of the seventh field-effect transistor M7, and the gate of the eighth field-effect transistor M8 is connected to the output of the control circuit. In the case where the current comparator has a positive input terminal and a negative input terminal, the gate of the eighth field-effect transistor M8 can serve as the positive input terminal (SENSEP) of the current comparator.

[0094] The source of the ninth field-effect transistor M9 is connected to the system power supply VDD, the drain of the ninth field-effect transistor M9 is connected to the source of the tenth field-effect transistor M10, the drain of the tenth field-effect transistor M10 is connected to the source of the eleventh field-effect transistor M11, the drain of the eleventh field-effect transistor M11 is connected to the positive electrode of the second resistor R2, and the negative electrode of the second resistor R2 is connected to the system ground SGND. The gate of the ninth field-effect transistor M9 is connected to the gate of the sixth field-effect transistor M6, the gate of the tenth field-effect transistor M10 is connected to the gate of the seventh field-effect transistor M7, and the gate of the eleventh field-effect transistor M10 is connected to the output of the inductor current sampling module 05. When the current comparator has a positive input terminal and a negative input terminal, the gate of the eleventh field-effect transistor M10 can serve as the negative input terminal (SENSEN) of the current comparator.

[0095] A third resistor R3 is connected between a fifth node T5 on a branch connecting the drain of the seventh field-effect transistor M7 and the source of the eighth field-effect transistor M8, and a sixth node T6 on a branch connecting the drain of the tenth field-effect transistor M10 and the source of the eleventh field-effect transistor M11. Furthermore, the control current IVC received by the current comparator can flow from the fifth node T5 through the third resistor R3 and be transmitted to the sixth node T6.

[0096] It should be noted that the difference between the positive phase input terminal SENSEP and the negative phase input terminal SENSEN of the current comparator is Gi*IL, where Gi is the gain of the inductor current sampling module and IL is the inductor current. Due to the existence of the control current IVC, it has a certain influence on the working state of the internal circuit of the current comparator, and the third resistor R3 determines the degree of influence of the control current IVC on the current comparator. Based on the two, the flip threshold of the level signal output by the current comparator can be non-zero, thereby enhancing the flexibility and adaptability of the current comparator. Moreover, based on the existence of the control current IVC and the third resistor R3, the flip threshold of the level signal output by the current comparator can be determined by the offset generated by the control current IVC and the third resistor R3, as shown in formula (1):

[0097]

[0098] correspond Figure 6 , the control current ΔIVC required to switch the mode is reduced by IVC1-IVC2. Combined with formula (1), the control current ΔIVC required to be reduced can be shown in formula (2):

[0099]

[0100] In order to clearly analyze the factors affecting the reduction of the control current required when switching the working phase mode of the multi-phase Buck converter of the embodiment of the present invention, Figure 8 The diagram shows the change curves of the control voltage VC and the control current IVC when a multi-phase Buck converter undergoes phase shedding action. Figure 8 The multi-phase Buck converter shown in the result is a multi-phase Buck converter (Buck1) that does not include the control circuit and other structures as in the embodiment of the present invention; Figure 9 The schematic diagram of the change curve of the control voltage VC and the control current IVC when another multi-phase Buck converter undergoes phase cutting action is shown. Figure 9 The multi-phase Buck converter shown in the result is the multi-phase Buck converter (Buck2) described in the embodiment of the present invention. Figure 10 The following is a schematic diagram showing the simulation results of the test results of the control voltage VC and the output voltage Vout of Buck1 and Buck2.

[0101] Combine Figure 8 and Figure 9 ,as well as Figure 10As shown, the control voltage VC of Buck 1 fluctuates significantly before and after mode switching. Furthermore, the change in control current IVC is correlated with the feedback current IVC_IN derived from the control voltage VC, and is unrelated to the bias current IBIAS corresponding to the number of phases switched. In other words, the control current ΔIVC required to switch Buck 1 during mode switching is determined by the change in feedback current IVC_IN caused by the change in control voltage VC. Therefore, when the control voltage VC fluctuates significantly before and after Buck 1 phase shedding, Buck 1's feedback current IVC_IN also fluctuates significantly, resulting in significant fluctuations in the required control current ΔIVC reduction and, consequently, in Buck 1's output voltage Vout. Consequently, the corresponding feedback current IVC_IN, and therefore the output voltage, cannot stabilize until the control voltage VC stabilizes after Buck 1 phase shedding. This leads to uncertainty in the stabilization time of the control voltage, reducing its stability.

[0102] In Buck 2, however, the control voltage VC fluctuates minimally before and after mode switching. Furthermore, the feedback current IVC_IN derived from the control voltage VC remains unchanged. However, the number of phases corresponding to the mode switching changes, and with this change, the corresponding bias current IBIAS also changes. In other words, the change in Buck 2's control current IVC is unrelated to the feedback current IVC_IN and is solely related to the bias current IBIAS corresponding to the number of phases. This means that the increase or decrease in control current ΔIVC required for Buck 2's mode switching is directly determined by the increase or decrease in bias current IBIAS. Therefore, while the feedback current IVC_IN remains unchanged before and after Buck 2's mode switching, the fluctuation in the control voltage VC, which directly influences the feedback current IVC_IN, is also reduced before and after the mode switching. This reduces the time required for the control voltage VC to stabilize during phase shedding, improving the stability of the control voltage. Furthermore, this improved control voltage stability also improves the stability of Buck 2's output voltage.

[0103] It can be seen that the multi-phase Buck converter of the embodiment of the present invention determines the control current through the control circuit based on the first current input by the voltage-to-current converter and the current difference corresponding to the number of working phases of the multi-phase Buck converter determined by the phase control module according to the inductor current of each phase circuit, so that the control current does not need to be determined by the output voltage, avoiding the influence of the output voltage of the multi-phase Buck converter. Then, the control circuit can output the control current to the current comparator of each phase circuit in the corresponding multi-phase Buck converter, so that when the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to switch the phase working state of the corresponding phase circuit, thereby reducing the control voltage fluctuation when the phase is cut, thereby reducing the stabilization time of the control voltage and improving the stability of the control voltage.

[0104] As another optional implementation of the disclosed content of the embodiments of the present invention, the embodiments of the present invention further provide a chip, which includes the multi-phase Buck converter provided in any of the above embodiments.

[0105] As another optional implementation of the disclosure of the embodiments of the present invention, the embodiments of the present invention further provide an electronic device, which includes the chip provided in any of the above embodiments. The electronic device can be a terminal device or a server device.

[0106] The above describes multiple embodiment schemes provided by the embodiments of the present invention. The various optional methods introduced in each embodiment scheme can be combined and cross-referenced with each other without conflict, thereby extending a variety of possible embodiment schemes, which can all be considered as embodiment schemes disclosed and disclosed by the embodiments of the present invention. Although the embodiments of the present invention are disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A multi-phase Buck converter, characterized in that: At least includes: a voltage-to-current converter, a phase control module, and a control circuit and a current comparator corresponding to each phase circuit in the multi-phase Buck converter; The input end of the control circuit is connected to the output end of the voltage-to-current converter and the output end of the phase control module, and is used to receive a first current and the number of working phases corresponding to the multi-phase Buck converter, so as to determine a control current based on a current difference between the first current and the number of working phases; wherein the first current is determined by the voltage-to-current converter based on the control voltage of the multi-phase Buck converter, and the number of working phases is determined by the phase control module based on the inductor current of each phase circuit; The output end of the control circuit is connected to the non-phase input end of the current comparator, and is used to output the control current to the current comparator, so that when the control current is less than or equal to the inductor current of the corresponding phase circuit, the current comparator outputs a level signal for flipping between a low level and a high level to the phase circuit, so as to switch the phase working state of the corresponding phase circuit.

2. The multi-phase Buck converter according to claim 1, characterized in that: The control circuit includes a positive current unit and a negative current unit; The forward current unit is configured to receive the first current; The negative current unit is used to receive the number of working phases, determine a control current according to a current difference between the first current and the number of working phases, and output the control current to the current comparator.

3. The multi-phase Buck converter according to claim 2, characterized in that: The forward current unit includes: a first field effect transistor and a second field effect transistor; The source of the first field-effect transistor and the source of the second field-effect transistor are respectively connected to the system power supply, the gate of the first field-effect transistor is connected to the gate of the second field-effect transistor, and the drain of the first field-effect transistor is connected to the output end of the voltage-to-current converter for receiving the first current, and the first node on the connecting branch between the source of the first field-effect transistor and the output end of the voltage-to-current converter is connected to the second node on the connecting branch between the gate of the first field-effect transistor and the gate of the second field-effect transistor.

4. The multi-phase Buck converter according to claim 3, characterized in that: The negative current unit includes: a first bias circuit, a second bias circuit, a third bias circuit and a fourth bias circuit connected in parallel; The first bias circuit corresponds to the first number of working phases and includes a first bias device, the first bias device is used to provide a first bias current, and the negative electrode of the first bias device is connected to the system ground terminal; The second bias circuit corresponds to the second number of working phases and includes a second bias device and a third field effect transistor, the second bias device is used to provide a second bias current, the source of the third field effect transistor is connected to the negative electrode of the second bias device, the drain is connected to the system ground terminal, and the gate is connected to the output terminal of the phase control module that outputs the second number of working phases; The third bias circuit corresponds to the third number of working phases and includes a third bias device and a fourth field effect transistor. The third bias device is used to provide a third bias current. The source of the fourth field effect transistor is connected to the negative electrode of the third bias device, the drain is connected to the system ground terminal, and the gate is connected to the output terminal of the phase control module that outputs the third number of working phases. The fourth bias circuit corresponds to the fourth number of working phases, and includes a fourth bias device and a fifth field-effect transistor. The fourth bias device is used to provide a fourth bias current. The source of the fifth field-effect transistor is connected to the negative electrode of the fourth bias device, the drain is connected to the system ground terminal, and the gate is connected to the output terminal of the phase control module that outputs the fourth number of working phases. A third node on a connecting branch where the positive electrodes of the first bias device, the second bias device, the third bias device, and the fourth bias device are connected in parallel is connected to a fourth node on a connecting branch where the drain of the second field-effect transistor is connected to the input end of the current comparator, and is configured to determine a control current based on a current difference between the first current and the current corresponding to the number of working phases, and output the control current to the current comparator.

5. The multi-phase Buck converter according to claim 4, characterized in that: Also includes: an inductor current sampling module corresponding to each phase circuit in the multi-phase Buck converter, the inductor current sampling module being configured to sample the inductor current of the phase circuit based on the working state of the corresponding phase circuit; The output end of the inductor current sampling module is connected to the negative phase input end of the current comparator, so that the current comparator compares the inductor current of the corresponding phase circuit with the control current, and outputs a level signal for flipping between a low level and a high level when the inductor current of the corresponding phase circuit is greater than or equal to the control current.

6. The multi-phase Buck converter according to claim 5, characterized in that: The current comparator includes: a sixth field effect transistor, a seventh field effect transistor, an eighth field effect transistor, a ninth field effect transistor, a tenth field effect transistor, an eleventh field effect transistor, a first resistor, a second resistor and a third resistor; Wherein, the source of the sixth field-effect transistor is connected to the system power supply, the drain of the sixth field-effect transistor is connected to the source of the seventh field-effect transistor, the drain of the seventh field-effect transistor is connected to the source of the eighth field-effect transistor, the drain of the eighth field-effect transistor is connected to the positive electrode of the first resistor, the negative electrode of the first resistor is connected to the system ground, and the gate of the sixth field-effect transistor is connected to the gate of the seventh field-effect transistor, and the gate of the eighth field-effect transistor is connected to the output terminal of the control circuit; The source of the ninth field-effect transistor is connected to the system power supply, the drain of the ninth field-effect transistor is connected to the source of the tenth field-effect transistor, the drain of the tenth field-effect transistor is connected to the source of the eleventh field-effect transistor, the drain of the eleventh field-effect transistor is connected to the positive electrode of the second resistor, the negative electrode of the second resistor is connected to the system ground, and the gate of the ninth field-effect transistor is connected to the gate of the sixth field-effect transistor, the gate of the tenth field-effect transistor is connected to the gate of the seventh field-effect transistor, and the gate of the eleventh field-effect transistor is connected to the output end of the inductor current sampling module; In which, a third resistor is connected between the fifth node on the connecting branch between the drain of the seventh field effect transistor and the source of the eighth field effect transistor and the sixth node on the connecting branch between the drain of the tenth field effect transistor and the source of the eleventh field effect transistor; and the control current received by the current comparator flows from the fifth node through the third resistor and is transmitted to the sixth node.

7. The multi-phase Buck converter according to claim 5, characterized in that: The output end of the inductor current sampling module is also connected to the input end of the phase control module, so that the phase control module adjusts the number of phases in the multi-phase Buck converter in the working state according to the inductor current provided by each phase circuit, and determines the number of working phases that meets the current load requirement of the multi-phase Buck converter.

8. The multi-phase Buck converter according to claim 7, characterized in that: The phase control module includes: a phase comparator corresponding to each phase circuit in the multi-phase Buck converter, and a bias comparator corresponding to the second bias circuit, the third bias circuit, and the fourth bias circuit respectively; The positive phase input of the phase comparator is connected to the output of the inductor current sampling module, the negative phase input of the phase comparator receives the control voltage of the multi-phase Buck converter, and the outputs of the phase comparators are connected in parallel to determine the comparison voltage of the corresponding multi-phase Buck converter; the positive phase inputs of the bias comparators are connected in parallel, and the parallel phase comparators are connected to the parallel bias comparators so that the positive phase input of the bias comparator receives the comparison voltage, wherein the negative phase input of the bias comparator receives a reference voltage for comparison with the comparison voltage, so that the bias comparator outputs a corresponding level control signal based on the comparison result.

9. The multi-phase Buck converter according to claim 1, characterized in that: The multi-phase Buck converter further includes a feedback network and an error amplifier, wherein the output end of the feedback network is connected to the negative input end of the error amplifier, and is used to output the sampled output voltage of the multi-phase Buck converter to the error amplifier, so that the error amplifier compares the output voltage of the multi-phase Buck converter with a reference voltage and outputs a control voltage; the output end of the error amplifier is connected to the input end of the voltage-to-current converter, and is used to output the control voltage to the voltage-to-current converter, so that the voltage-to-current converter determines the first current based on the control voltage, wherein the first current is specifically the feedback current; A filter capacitor and a load resistor are connected in parallel to a seventh node on a branch connecting the negative phase input terminal of the error amplifier and the output terminal of the feedback network.

10. The multi-phase Buck converter according to claim 1, characterized in that: The phase circuit in the multi-phase Buck converter includes: a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube connected in series in sequence; a first capacitor connected to an eighth node on a branch connecting the first switching tube and the second switching tube; a first inductor connected to a ninth node on a branch connecting the third switching tube and the fourth switching tube; and a tenth node on a branch connecting the ninth node and the first inductor connected to a negative electrode of the first capacitor; Among them, each phase circuit is connected in parallel based on the eleventh node on the connection branch between the second switching tube and the third switching tube, and the twelfth node on the connection branch where each phase circuit is connected in parallel is connected to the positive electrode of the second capacitor, and the negative electrode of the second capacitor is connected to the ground end.

11. A chip, characterized in that: The multi-phase Buck converter comprises the multi-phase Buck converter according to any one of claims 1 to 10.

12. An electronic device, characterized in that: Comprising the chip according to claim 11.

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