Switched capacitor assisted single-inductor multi-output DC-DC converter

Abstract

The invention provides a switched capacitor-assisted single-inductor multi-output DC-DC converter. The switched capacitor-assisted single-inductor multi-output DC-DC converter comprises a switched inductor network branch and a plurality of switched capacitor network branches, the switch inductance network branch is connected between the input end and the plurality of output ends; the plurality of switched capacitor network branches are connected in parallel with the switched inductor network branch, and the tail end of each switched capacitor network branch is connected with an output end; through linkage on-off of switches in the switched inductor network branch and the switched capacitor network branch, the switched inductor network branch and any one switched capacitor network branch cooperatively supply power to one or more output ends, and direct current flowing through an inductor in the switched inductor network branch is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of circuit design, and in particular to a switched capacitor assisted single inductor multiple output DC-DC converter. Background Art

[0002] Single inductor multiple output (SIMO) power conversion chips have ultra-compact size and low material cost, providing a very suitable solution for space-limited wearable devices, headphones, IoT and other small battery-powered consumer electronic devices. However, as load demands increase, traditional SIMO converters face multiple challenges. First, in order to handle load currents up to several amperes, the inductor must have a high saturation current, which requires a larger volume and reduces power density. Second, the intermittent current delivery to the output causes high voltage spikes at the current distribution switches, which raises reliability concerns. Finally, the intermittent current delivery to the output causes large output ripple. Summary of the invention

[0003] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present disclosure provides a switched capacitor assisted single-inductor multiple-output DC-DC converter.

[0004] In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0005] According to an embodiment of one aspect of the present disclosure, a switched capacitor assisted single inductor multiple output DC-DC converter is provided, comprising a switched inductor network branch and a plurality of switched capacitor network branches.

[0006] The switch inductor network branch is connected between the input end and multiple output ends; multiple switch capacitor network branches are arranged in parallel with the switch inductor network branch, and each end of the switch capacitor network branch is connected to an output end; through the linkage on and off of the switch in the switch inductor network branch and the switch capacitor network branch, the switch inductor network branch and any switch capacitor network branch cooperate to supply power to one or more output ends, thereby reducing the DC current flowing through the inductor in the switch inductor network branch.

[0007] According to an embodiment of the present disclosure, the switch inductor network branch includes an inductor, a first end of the inductor is connected to an input end through a switch unit, and a second end of the inductor is connected to an output end through the switch unit.

[0008] According to an embodiment of the present disclosure, each of the switch capacitor network branches includes a flying capacitor, a first section of the flying capacitor is connected to an input end through a switch unit, and a second end of the flying capacitor is connected to an output end through a switch unit.

[0009] According to an embodiment of the present disclosure, N switch capacitor network branches are included, where 2≤N≤10.

[0010] According to an embodiment of the present disclosure, a DC-DC converter includes two switched capacitor network branches, namely a first switched capacitor network branch and a second switched capacitor network branch, and a switched inductor network branch.

[0011] According to an embodiment of the present disclosure, the first switch capacitor network branch includes a switch S 1 , switch S 2 , switch S 3 , flying capacitor C F1 , where switch S 3 、Flying capacitor C F1 , switch S 2 are connected in series between the input terminal and the first output node, the switch S 2 And the flying capacitor C F1 There is a node SW between 1 , switch S 3 And the flying capacitor C F1 There is a node SW between 2 , switch S 2 Connect to node SW 1 and ground; the second switch capacitor network branch includes a switch S 4 , switch S 5 , switch S 6 , flying capacitor C F2 , where switch S 6 、Flying capacitor C F2 , switch S 5 are connected in series between the input terminal and the second output node, the switch S 6 And the flying capacitor C F2 There is a node SW between 3 , switch S 5 And the flying capacitor C F2 There is a node SW between 4 , switch S 4 Connect to node SW 4 and between the earth.

[0012] According to an embodiment of the present disclosure, the switch inductor network branch includes an inductor L, a switch S 7 , switch S 8 , switch S 9 , switch S 10 , switch S 11 ; Switch S 7 Connected between the first terminal a of the inductor and ground, the switch S 8 connected to the first terminal a of the inductor and the node SW in the first switch capacitor network branch 2 Between, switch S9 connected to the first terminal a of the inductor and the node SW in the second switch capacitor network branch 3 Between, switch S 10 connected to the second end b of the inductor and the first output node SW of the first switch capacitor network branch o1 Between, switch S 11 connected to the second end b of the inductor and the first output node SW of the first switch capacitor network branch o2 between.

[0013] According to an embodiment of the present disclosure, the DC-DC converter includes a first working phase state, a second working phase state, a third working phase state, a fourth working phase state, a fifth working phase state, and a sixth working phase state; wherein, in the first working phase state, the switch S 2 , switch S 3 , switch S 4 , switch S 7 , switch S 9 , switch S 11 Disconnect, switch S 1 , switch S 5 , switch S 6 , switch S 8 , switch S 10 Flying capacitor C F1 The voltage is regulated by the inductor, the flying capacitor C F1 Connected in series with the inductor L to the first output terminal V O1 transfer current; at the same time, the input terminal V IN Through the flying capacitor C F2 To the second output terminal V O2 Transfer current; in the second working phase, switch S 2 , switch S 3 , switch S 4 , switch S 7 , switch S 9 , switch S 11 On, switch S 1 , switch S 5 , switch S 6 , switch S 8 , switch S 10 Disconnect; flying capacitor C F2 The voltage is regulated by the inductor, the flying capacitor C F2 Connected in series with the inductor L to the second output terminal V O2 transfer current; at the same time, the input terminal V IN Through the flying capacitor C F1 To the first output terminal V O1 Transfer current.

[0014] According to the embodiment of the present disclosure, when the inductor current at the end of the second working phase state is greater than the inductor current at the beginning of the first working phase state, the third working phase state and the fifth working phase state are selected; in the third working phase state, the switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 8 , switch S 9 , switch S 11 On, switch S 1 , switch S 4 , switch S 7 , switch S 10 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the second output terminal V O2 The current is transmitted and the inductor is demagnetized at the same time; in the fifth working phase state, the switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 7 , switch S 10 On, switch S 1 , switch S 4 , switch S 8 , switch S 9 , switch S 11 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the first output terminal V O1 The current is transmitted and the inductor is demagnetized at the same time; in the third working phase state and the fifth working phase state, the inductor is demagnetized, the inductor current decreases, and returns to the inductor current at the beginning of the first working phase state, thereby completing a cycle.

[0015] According to the embodiment of the present disclosure, when the inductor current at the end of the second working phase state is less than the inductor current at the beginning of the first working phase state, the fourth working phase state and the sixth working phase state are selected; in the fourth working phase state, the switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 7 , switch S 11 On, switch S1 , switch S 4 , switch S 8 , switch S 9 , switch S 10 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the second output terminal V O2 The current is transmitted and the inductor is magnetized at the same time; in the sixth working phase, the switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 8 , switch S 9 , switch S 10 Conduction, switch S 1 , switch S 4 , switch S 7 , switch S 11 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the first output terminal V O1 The current is transmitted and the inductor is magnetized at the same time; in the fourth working phase state and the sixth working phase state, the inductor is magnetized, the inductor current rises, and returns to the inductor current at the beginning of the first working phase state, thereby completing a cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram of a traditional single inductor multiple output (SIMO) DC-DC converter.

[0018] Figure 2 The figure is a schematic diagram of an existing hybrid single-inductor multiple-output DC-DC converter.

[0019] Figure 3 for Figure 2 The waveform diagram of the DC-DC converter when it is working is shown.

[0020] Figure 4 FIG. 1 is a schematic diagram of a switched capacitor assisted SIMO DC-DC converter according to an embodiment of the present disclosure.

[0021] Figure 5 Schematic diagram of a DC-DC converter including two switched capacitor network branches according to an embodiment of the present disclosure.

[0022] Figure 6 Schematic diagram of the working phase state flow of the DC-DC converter according to the embodiment of the present disclosure.

[0023] Figure 7 Schematic diagram of different working phase states of a DC-DC converter according to an embodiment of the present disclosure.

[0024] Figure 8 Schematic diagram of the composition of a DC-DC converter with more switched capacitor network branches according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] The present disclosure provides a switched capacitor assisted single inductor multiple output DC-DC converter, the DC current and current ripple of the inductor are significantly reduced, so that a smaller inductor can be used, thereby reducing conduction losses and improving power density and efficiency. Secondly, since the inductor current is reduced, the intermittent current in the energy distribution switch is also reduced, thereby reducing voltage spikes and enhancing system reliability. Finally, since the inductor and capacitor alternately provide current to the output, the output voltage ripple is significantly reduced.

[0026] In a conventional single inductor multiple output (SIMO) DC-DC converter, such as Figure 1 , inductor current I L By switch S P and S N control, thereby controlling the inductance from the input V IN The inductor current I L Through the current distribution switch S 1 and S 2 To obtain a stable output voltage V O1 and V O2 , usually requires a filter capacitor (C O1 and C O2 ). The inductor current should satisfy

[0027] (1);

[0028] As the load current (I O1 and I O2 ) With the increase in demand, in order to handle load currents of up to several amperes, the inductor must have a high saturation current, which requires a larger volume and thus reduces the power density.

[0029] Figure 2This is a hybrid single-inductor multi-output DC-DC converter in the prior art [reference paper: L. -C.Chu et al., "10.5 A three-level single-inductor triple-output converter with an adjustable flying-capacitor technique for low output ripple and fast transient response," ISSCC, pp. 186-187, Feb. 2017.]. This topology replaces the inductor current regulation module with a hybrid topology of switched capacitors and inductors. Although the size of the inductor can be reduced, the inductor current still satisfies formula (1), so the inductor current is not reduced. The current switch alternately guides the inductor current to the output terminal V O1 and V O2 , which will generate a discontinuous current I Lp1 and I Lp2 However, the chip package and circuit board routing will inevitably cause parasitic inductance (L p1 and L p2 ), the inductor prevents the current from being interrupted, thus causing the switch S 1 and S 2 A large voltage spike appears on the right side of the topology, reducing reliability. In addition, in order to obtain a stable output voltage, this topology also requires a larger output filter capacitor (C O1 and C O2 ) to cope with larger discontinuous current. The specific waveform is as follows Figure 3 shown.

[0030] Traditional SIMO DC-DC converters rely on one inductor to deliver current to all outputs, and achieve the function of single inductor multiple outputs by time-division multiplexing of the inductor current. However, the current required by the load is completely provided by the inductor alone, which means that the inductor must have a large saturation current. Time-division multiplexing of the inductor means that the output current is discontinuous, which means that the output ripple becomes larger.

[0031] In view of the above disadvantages, the present invention provides a switched capacitor assisted single inductor multiple output DC-DC converter.

[0032] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0033] In an embodiment of the present disclosure, a switched capacitor assisted single inductor multiple output DC-DC converter is provided, such as Figure 4As shown, the DC-DC converter includes a switch inductor network branch and a plurality of switch capacitor network branches.

[0034] The switch inductor network branch is connected to the input terminal V IN and multiple outputs (V O1 ~V ON )between;

[0035] Each of the plurality of switch capacitor network branches is arranged in parallel with the switch inductor network branch, and an output terminal is connected to a terminal of each switch capacitor network branch;

[0036] By connecting and disconnecting the switches in the switch inductor network branch and the switch capacitor network branch, the switch inductor network branch and any switch capacitor network branch cooperate to supply power to one or more output terminals, thereby reducing the DC current I flowing through the inductor L in the switch inductor network branch. L .

[0037] The DC-DC converter also includes a switch switching unit for coordinating the linkage switching of switches in the switch inductor network branch and the plurality of switch capacitor network branches. Figure 4 The corresponding load is connected after each output terminal.

[0038] According to the embodiment of the present disclosure, Figure 4 As shown, compared with the traditional method of only passing the inductor L to the output terminal V O1 ~V ON To transfer charge, the present invention introduces a flying capacitor C 1~ C N To assist the inductor to transfer charge to the output end (I CF1 ~I CFN ), thereby reducing the current that the inductor L needs to provide. The red and blue arrows in the figure represent the direction of charge transfer respectively.

[0039] like Figure 4 As shown, the switch inductor network branch includes an inductor L, and the first end of the inductor L (the left end of the inductor L shown in the figure) is connected to the input terminal V through a switch unit. IN The second end of the inductor (the right end of the inductor L in the figure) is connected to an output end (V O1 ~V ON Each of the N switch capacitor network branches includes a flying capacitor (C F1~ C FN ), the first section of the flying capacitor (the left end of the capacitor shown in the figure) is connected to the input terminal V through the switch unit INThe second end of the flying capacitor (the right end of the capacitor shown in the figure) is connected to an output end through a switch unit. The switch unit can be one or more switches or devices with switch functions; it should be noted that the value of N can be adjusted according to the actual application, for example, 2≤N≤10. Figure 5 As shown, the DC-DC converter includes two switched capacitor network branches.

[0040] According to the embodiment of the present disclosure, Figure 5 As shown, the DC-DC converter includes a first switched capacitor network branch 201, a second switched capacitor network branch 202, and a switched inductor network branch 203; the first switched capacitor network branch 201 is used to provide a voltage from the input terminal V IN To the output terminal V O1 The current path is thus reduced, thereby reducing the DC current flowing through the inductor L. At the same time, the inductor L can pass through the flying capacitor C F1 The second switch capacitor network branch 202 is mainly used to provide the voltage from V IN To the output terminal V O2 The current path is thus reduced, thereby reducing the DC current flowing through the inductor l. At the same time, the inductor L can pass through the flying capacitor C F2 The switch inductor network branch 203 is mainly used to adjust the output voltage and the flying capacitor voltage. Specifically:

[0041] The first switched capacitor network branch 201 includes a switch S 1 , switch S 2 , switch S 3 , flying capacitor C F1 , where switch S 3 、Flying capacitor C F1 , switch S 2 are connected in series to the input terminal and the first output node SW o1 Between, switch S 2 And the flying capacitor C F1 There is a node SW between 1 , switch S 3 And the flying capacitor C F1 There is a node SW between 2 , switch S 2 Connect to node SW 1 and ground; the first output node SW o1 Connected to the first output terminal, the first output node SW o1 and the first output terminal V O1 A first voltage stabilizing capacitor C is provided between 01 And grounded.

[0042] The second switched capacitor network branch 202 includes a switch S 4 , switch S 5 , switch S 6 , flying capacitor C F2 , where switch S 6 、Flying capacitor C F2 , switch S 5 are connected in series to the input terminal and the second output node SW o2 Between, switch S 6 And the flying capacitor C F2 There is a node SW between 3 , switch S 5 And the flying capacitor C F2 There is a node SW between 4 , switch S 4 Connect to node SW 4 and ground; the second output node SW o2 Connected to the second output terminal, the second output node SW o2 and the second output terminal V O2 A second voltage stabilizing capacitor C is provided between 02 And grounded.

[0043] The switch inductor network branch includes the inductor L, the switch S 7 , switch S 8 , switch S 9 , switch S 10 , switch S 11 ; Switch S 7 Connected between the first terminal a of the inductor and ground, the switch S 8 connected to the first terminal a of the inductor and the node SW in the first switch capacitor network branch 2 Between, switch S 9 connected to the first terminal a of the inductor and the node SW in the second switch capacitor network branch 3 Between, switch S 10 connected to the second end b of the inductor and the first output node SW of the first switch capacitor network branch o1 Between, switch S 11 connected to the second end b of the inductor and the first output node SW of the first switch capacitor network branch o2 between.

[0044] According to the embodiment of the present disclosure, Figure 5-Figure 7As shown, the DC-DC converter includes six working phase states, namely, a first working phase state (Phase 1), a second working phase state (Phase 2), a third working phase state (Phase 3), a fourth working phase state (Phase 4), a fifth working phase state (Phase 5), and a sixth working phase state (Phase 6). These working phase states may be redundant. For example, a cycle may be configured according to Phase 1, Phase 2, Phase 3, and Phase 5, or a cycle may be configured according to Phase 1, Phase 2, and Phase 5, or a cycle may be configured according to Phase 2, Phase 3, and Phase 5. All of these may enable the DC-DC converter to work. In applications, appropriate working phase selection and configuration may be performed according to actual application conditions, efficiency requirements, and the like.

[0045] Specifically, combined Figure 5-Figure 7 As shown, at a certain moment, the current I in the inductor L Equal to I L0 , in the first working phase, switch S 2 , switch S 3 , switch S 4 , switch S 7 , switch S 9 , switch S 11 Disconnect, switch S 1 , switch S 5 , switch S 6 , switch S 8 , switch S 10 Flying capacitor C F1 The voltage is regulated by the inductor, the flying capacitor C F1 Connected in series with the inductor L to the first output terminal V O1 transfer current; at the same time, the input terminal V IN Through the flying capacitor C F2 To the second output terminal V O2 After the first working phase, the inductor current changes to I L1 .

[0046] In the second working phase, switch S 2 , switch S 3 , switch S 4 , switch S 7 , switch S 9 , switch S 11 On, switch S 1 , switch S 5 , switch S 6 , switch S 8 , switch S 10 Disconnect; flying capacitor C F2The voltage is regulated by the inductor, the flying capacitor C F2 Connected in series with the inductor L to the second output terminal V O2 transfer current; at the same time, the input terminal V IN Through the flying capacitor C F1 To the first output terminal V O1 After the second working phase, the inductor current changes to I L2 It should be noted that I L0 、Input terminal I L1 ,I L2 They can all be preset values, for example, all three values ​​can be preset to be greater than the load current I O An arbitrary value of half of .

[0047] According to the embodiment of the present disclosure, when the second working phase state ends, the inductor current I L2 Greater than the inductor current I at the beginning of the first working phase L0 , select the third working phase state and the fifth working phase state, specifically:

[0048] In the third working phase, switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 8 , switch S 9 , switch S 11 On, switch S 1 , switch S 4 , switch S 7 , switch S 10 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the second output terminal V O2 The current is passed and the inductor is demagnetized at the same time.

[0049] In the fifth working phase, switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 7 , switch S 10 On, switch S 1 , switch S 4 , switch S 8 , switch S 9 , switch S 11 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor CF2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the first output terminal V O1 The current is passed and the inductor is demagnetized at the same time.

[0050] After the third working phase state and the fifth working phase state, the inductor is demagnetized, the inductor current decreases, and returns to the inductor current I at the beginning of the first working phase state. L0 , thus completing a working cycle.

[0051] According to the embodiment of the present disclosure, when the second working phase state ends, the inductor current I L2 Less than the inductor current I at the beginning of the first working phase L0 , select the fourth working phase state and the sixth working phase state; specifically:

[0052] In the fourth working phase, switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 7 , switch S 11 On, switch S 1 , switch S 4 , switch S 8 , switch S 9 , switch S 10 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the second output terminal V O2 Current is transferred and the inductor is magnetized at the same time.

[0053] In the sixth working phase, switch S 2 , switch S 3 , switch S 5 , switch S 6 , switch S 8 , switch S 9 , switch S 10 Conduction, switch S 1 , switch S 4 , switch S 7 , switch S 11 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2transfer current; the inductor to the first output terminal V O1 Current is transferred and the inductor is magnetized at the same time.

[0054] After the fourth working phase state and the sixth working phase state, the inductor is magnetized, the inductor current rises, and returns to the inductor current I at the beginning of the first working phase state. L0 , thus completing a working cycle.

[0055] In the above specific embodiment, only two switch capacitor network branches, namely the first switch capacitor network branch 201 and the second switch capacitor network branch 202, are used. In practice, more switch capacitor networks can be used according to specific needs to support more output voltages, such as Figure 8 As shown, N switch capacitor network branches may be included, where N ≥ 2. Since the present invention introduces capacitors and inductors to cooperate in transferring charge to a single output terminal, the inductor current in the traditional SIMO is effectively reduced. During operation, the capacitors and inductors alternately provide current to a single output, which also makes the current transferred to the output by the converter more continuous.

[0056] So far, the embodiments of the present disclosure have been described in detail in conjunction with the accompanying drawings. It should be noted that the implementation methods not shown or described in the drawings or the body of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and ordinary technicians in the field can simply change or replace them.

[0057] It should be noted that, in this document, unless otherwise specified, “a” element is not limited to a single element, but may include one or more elements.

[0058] In addition, in this document, unless otherwise specified, ordinal numbers such as "first" and "second" are only used to distinguish multiple components with the same name, and do not indicate the existence of a hierarchy, level, execution order, or process order between them. A "first" component and a "second" component may appear together in the same component, or appear in different components. The presence of a component with a larger ordinal number does not necessarily indicate the presence of another component with a smaller ordinal number.

[0059] In this document, unless otherwise specified, the so-called feature A "or" or "and / or" (and / or) feature B means that A exists alone, B exists alone, or A and B exist at the same time; the so-called feature A "and" (and) or "and" (and) or "and" (and) feature B means that A and B exist at the same time; the so-called "include", "comprise", "have" and "contain" mean including but not limited to these.

[0060] In addition, in this document, the terms "upper", "lower", "left", "right", "front", "back", or "between" are only used to describe the relative positions between multiple elements, and can be extended to include translation, rotation, or mirroring. In addition, in this document, unless otherwise specified, "an element is on another element" or similar descriptions do not necessarily mean that the element contacts the other element.

[0061] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0062] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A switched capacitor assisted single inductor multiple output DC-DC converter, comprising: A switch inductor network branch is connected between the input terminal and the plurality of output terminals; as well as A plurality of switch capacitor network branches are arranged in parallel with the switch inductor network branch, and an output terminal is connected to an end of each switch capacitor network branch; By connecting and disconnecting the switches in the switch inductor network branch and the switch capacitor network branch, the switch inductor network branch and any switch capacitor network branch cooperate to supply power to one or more output ends, thereby reducing the DC current flowing through the inductor in the switch inductor network branch.

2. The DC-DC converter according to claim 1, wherein the switch inductor network branch comprises an inductor, a first end of the inductor is connected to an input end through a switch unit, and a second end of the inductor is connected to an output end through the switch unit.

3. The DC-DC converter according to claim 1, wherein each of the switch capacitor network branches comprises a flying capacitor, a first section of the flying capacitor is connected to an input terminal through a switch unit, and a second terminal of the flying capacitor is connected to an output terminal through a switch unit.

4. The DC-DC converter according to any one of claims 1 to 3, comprising N switched capacitor network branches, 2≤N≤10.

5. The DC-DC converter according to any one of claims 1 to 3, comprising two switched capacitor network branches.

6. The DC-DC converter according to any one of claims 1 to 3, comprising a first switched capacitor network branch and a second switched capacitor network branch; The first switch capacitor network branch includes switch S1, switch S2, switch S3, flying capacitor C F1 , where switch S3, flying capacitor C F1 , the switch S2 is connected in series between the input terminal and the first output node, the switch S2 and the flying capacitor C F1 A node SW1, a switch S3 and a flying capacitor C are provided between F1 A node SW2 is provided between the nodes, and the switch S2 is connected between the node SW1 and the ground; The second switch capacitor network branch includes switch S4, switch S5, switch S6, flying capacitor C F2 , where switch S6, flying capacitor C F2 , switch S5 is connected in series between the input terminal and the second output node, switch S6 and flying capacitor C F2 A node SW3, a switch S5 and a flying capacitor C are provided between F2 A node SW4 is provided between the nodes, and the switch S4 is connected between the node SW4 and the ground.

7. The DC-DC converter according to claim 6, wherein the switch inductor network branch comprises an inductor L, a switch S7, a switch S8, a switch S9, a switch S 10 , switch S 11 ; switch S7 is connected between the first end a of the inductor and the ground, switch S8 is connected between the first end a of the inductor and the node SW2 in the first switch capacitor network branch, switch S9 is connected between the first end a of the inductor and the node SW3 in the second switch capacitor network branch, and switch S 10 connected to the second end b of the inductor and the first output node SW of the first switch capacitor network branch o1 Between, switch S 11 connected to the second end b of the inductor and the first output node SW of the first switch capacitor network branch o2 between.

8. The DC-DC converter according to claim 7, comprising a first working phase state, a second working phase state, a third working phase state, a fourth working phase state, a fifth working phase state, and a sixth working phase state; wherein, In the first working phase, switches S2, S3, S4, S7, S9, and S 11 Disconnect, switch S1, switch S5, switch S6, switch S8, switch S 10 Flying capacitor C F1 The voltage is regulated by the inductor, the flying capacitor C F1 Connected in series with the inductor L to the first output terminal V O1 Passing current; at the same time, the input terminal V IN Through the flying capacitor C F2 To the second output terminal V O2 To transmit electric current; In the second working phase state, switches S2, S3, S4, S7, S9, and S 11 On, switch S1, switch S5, switch S6, switch S8, switch S 10 Disconnect; flying capacitor C F2 The voltage is regulated by the inductor, the flying capacitor C F2 Connected in series with the inductor L to the second output terminal V O2 Passing current; at the same time, the input terminal V IN Through the flying capacitor C F1 To the first output terminal V O1 Passing current.

9. The DC-DC converter according to claim 8, when the inductor current at the end of the second working phase state is greater than the inductor current at the beginning of the first working phase state, the third working phase state and the fifth working phase state are selected; In the third working phase, switches S2, S3, S5, S6, S8, S9, and S 11 On, switch S1, switch S4, switch S7, switch S 10 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the second output terminal V O2 Passing current while demagnetizing the inductor; In the fifth working phase, switches S2, S3, S5, S6, S7, and S 10 On, switch S1, switch S4, switch S8, switch S9, switch S 11 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the first output terminal V O1 Passing current while demagnetizing the inductor; After the third working phase state and the fifth working phase state, the inductor is demagnetized, the inductor current decreases, and returns to the inductor current at the beginning of the first working phase state, thereby completing a cycle.

10. The DC-DC converter according to claim 8, when the inductor current at the end of the second working phase state is less than the inductor current at the beginning of the first working phase state, the fourth working phase state and the sixth working phase state are selected; In the fourth working phase, switches S2, S3, S5, S6, S7, and S 11 On, switch S1, switch S4, switch S8, switch S9, switch S 10 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the second output terminal V O2 Transfer current and magnetize the inductor at the same time; In the sixth working phase, switches S2, S3, S5, S6, S8, S9, and S 10 On, switch S1, switch S4, switch S7, switch S 11 Disconnect; input terminal V IN Through the flying capacitor C F1 And the flying capacitor C F2 To the first output terminal V O1 and the second output terminal V O2 transfer current; the inductor to the first output terminal V O1 Transfer current and magnetize the inductor at the same time; After the fourth working phase state and the sixth working phase state, the inductor is magnetized, the inductor current rises, and returns to the inductor current at the beginning of the first working phase state, thereby completing a cycle.

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