Power supply network structure for driving circuit of series-parallel switched capacitor voltage converter
By employing a power supply network structure combining a bootstrap capacitor and a low-voltage power supply in the drive circuit of a series-parallel switched capacitor voltage converter, the voltage drop of the conducting tube is eliminated, the loss problem in the drive circuit is solved, the conversion efficiency is improved, and the temperature rise is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
- Filing Date
- 2023-03-14
- Publication Date
- 2026-05-19
AI Technical Summary
In existing series-parallel switched capacitor voltage converter drive circuits, the conduction loss is relatively large, resulting in low conversion efficiency. In particular, it is difficult to reduce the loss on the tubes in charging scenarios with two batteries connected in series.
A power supply network structure combining bootstrap capacitors and low-voltage power supply is adopted, connecting the drive circuits of all power transistors to the internal low-voltage power supply to eliminate the voltage drop of the conducting transistors, thereby reducing losses.
By eliminating the voltage drop across the conducting tube, the conversion efficiency of the switched capacitor voltage converter is improved, losses are reduced, load capacity is increased, and temperature rise is lowered.
Smart Images
Figure CN116317459B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power management technology, and in particular to a power supply network structure for a drive circuit of a series-parallel switched capacitor voltage converter. Background Technology
[0002] Switched capacitor voltage converters are widely used as a basic power conversion structure in various power management applications to achieve voltage and current conversion between input and output at different ratios. Figure 1 This diagram illustrates a typical series-parallel switched-capacitor voltage converter. The circuit uses capacitors CF1A / CF2A / CF1B / CF2B to transfer charge from the input terminal PMID to the output terminal VOUT, achieving a 3:1 voltage-to-current conversion, i.e., the output voltage V... OUT =V IN / 3, Output current I OUT =3*I IN V IN and I IN These represent the input voltage and input current, respectively.
[0003] Conversion efficiency is the most important indicator of a switched-capacitor voltage converter, as it determines the converter's load capacity and temperature rise. Higher conversion efficiency results in a greater load capacity and lower temperature rise. The main losses in a switched-capacitor voltage converter come from: 1) the conduction losses of each switch in the circuit; 2) the drive losses of each switch; and 3) the ESR losses of each capacitor. Improving conversion efficiency hinges on reducing these losses, where 2) the drive losses of each switch are related to the structure of the switch's drive circuit.
[0004] exist Figure 1 Based on the series-parallel switched capacitor voltage converter shown, Figure 2 The drive circuit structure of this single-sided switched capacitor voltage converter is shown, wherein transistor Q1A is driven by the voltage V at capacitor BST1A. BST1A Power is supplied, and during the stage when transistor Q2A is turned on, i.e., V C1PA =V OUT The input voltage V at the PMID input terminal is used to determine the input voltage. IN The capacitor BST1A is powered by the driver transistor MN1 through clamping; the drive of transistor Q4A is determined by the voltage V at node C1PA. C1PA Power is supplied after clamping by MN4; the drive of transistor Q7A is the voltage V at node C2PA. C2PA Power is supplied after clamping by transistor MN7; the Q2A / Q5A transistors are driven by the input voltage V at PMID. INPower is supplied after clamping by transistor MN25; the drive of transistors Q3A / Q6A is powered by the low-voltage power supply REGN. There is a voltage difference between the drain and source terminals of transistors MN1, MN4, MN7, and MN25. This voltage difference and the drive current cause losses in transistors MN1, MN4, MN7, and MN25. For example, when V... IN =30V, V OUT At 10V, there is a 5V voltage difference between the drain and source terminals of transistors MN1, MN4, and MN7, while there is a 15V voltage difference between the drain and source terminals of transistor MN25. This voltage difference leads to losses in transistors MN1, MN4, MN7, and MN25. This power supply method makes it difficult to reduce the losses in the transistors to zero in a charging scenario with two batteries connected in series. Therefore, to improve efficiency, a new power supply network structure is needed. Summary of the Invention
[0005] To address the aforementioned problems, this invention proposes a power supply network structure for the drive circuit of a series-parallel switched capacitor voltage converter, which reduces the losses of the switched capacitor voltage converter and improves its conversion efficiency by eliminating the voltage drop across the conducting tube.
[0006] To achieve the above objectives, the present invention provides the following solution:
[0007] A power supply network structure for a drive circuit of a series-parallel switched capacitor voltage converter, wherein the series-parallel switched capacitor voltage converter includes power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A and Q7B, and capacitors CF1A, CF2A, CF1B and CF2B;
[0008] The power supply network structure of the drive circuit of the series-parallel switched capacitor voltage converter includes: bootstrap capacitors CBST1A, CBST1B, CBST2A, CBST2B, CBST3A, CBST3B and CBST4, and switches S1A, S1B, S2A, S2B, S3A, S3B, S4A and S4B.
[0009] The lower plate of the bootstrap capacitor CBST1A is connected to node C1PA, where node C1PA is the connection node between power transistor Q1A and capacitor CF1A; the upper plate of the bootstrap capacitor CBST1A is connected to the drive circuit of power transistor Q1A; the upper plate of the bootstrap capacitor CBST1A is also connected to the upper plate of the bootstrap capacitor CBST4 via the switch S1A; the lower plate of the bootstrap capacitor CBST2A is connected to node C1NA, where node C1NA is the connection node between power transistor Q4A and capacitor CF1A. Point; the upper plate of the bootstrap capacitor CBST2A is connected to the driving circuit of the power transistor Q4A; the upper plate of the bootstrap capacitor CBST2A is also connected to a low-voltage power supply through the switch S2A; the lower plate of the bootstrap capacitor CBST3A is connected to node C2NA, where node C2NA is the connection node between the power transistor Q7A and the capacitor CF2A; the upper plate of the bootstrap capacitor CBST3A is connected to the driving circuit of the power transistor Q7A; the upper plate of the bootstrap capacitor CBST3A is also connected to a low-voltage power supply through the switch S3A;
[0010] The lower plate of the bootstrap capacitor CBST1B is connected to node C1PB, where node C1PB is the connection node between power transistor Q1B and capacitor CF1B; the upper plate of the bootstrap capacitor CBST1B is connected to the drive circuit of power transistor Q1B; the upper plate of the bootstrap capacitor CBST1B is also connected to the upper plate of the bootstrap capacitor CBST4 through the switch S1B; the lower plate of the bootstrap capacitor CBST2B is connected to node C1NB, where node C1NB is the connection node between power transistor Q4B and capacitor CF1B. Point; the upper plate of the bootstrap capacitor CBST2B is connected to the driving circuit of the power transistor Q4B; the upper plate of the bootstrap capacitor CBST2B is also connected to a low-voltage power supply through the switch S2B; the lower plate of the bootstrap capacitor CBST3B is connected to node C2NB, where node C2NB is the connection node between the power transistor Q7B and the capacitor CF2B; the upper plate of the bootstrap capacitor CBST3B is connected to the driving circuit of the power transistor Q7B; the upper plate of the bootstrap capacitor CBST3B is also connected to a low-voltage power supply through the switch S3B;
[0011] The lower plate of the bootstrap capacitor CBST4 is connected to the output terminal VOUT; the upper plate of the bootstrap capacitor CBST4 is also connected to the upper plates of the bootstrap capacitors CBST3A and CBST3B respectively through switches S4A and S4B.
[0012] Optionally, the driving circuits of the power transistors Q2A, Q2B, Q5A, and Q5B are all connected to the upper plate of the bootstrap capacitor CBST4.
[0013] Optionally, the drive circuits for the power transistors Q3A, Q3B, Q6A, and Q6B are all connected to the low-voltage power supply.
[0014] Optionally, the power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, and Q7B are all PMOS power MOSFETs.
[0015] Optionally, the drain of power transistor Q1A is connected to the input terminal PMID; the source of power transistor Q1A is connected to the drain of power transistor Q2A and one end of capacitor CF1A; the source of power transistor Q3A is grounded; the drain of power transistor Q3A is connected to the source of power transistor Q4A and the other end of capacitor CF1A; the drain of power transistor Q4A is connected to the drain of power transistor Q5A and one end of capacitor CF2A; the source of power transistor Q6A is grounded; the drain of power transistor Q6A is connected to the source of power transistor Q7A and the other end of capacitor CF2A; the sources of power transistors Q2A, Q5A, and Q7A are all connected to the output terminal VOUT.
[0016] Optionally, the drain of power transistor Q1B is connected to the input terminal PMID; the source of power transistor Q1B is connected to the drain of power transistor Q2B and one end of capacitor CF1B; the source of power transistor Q3B is grounded; the drain of power transistor Q3B is connected to the source of power transistor Q4B and the other end of capacitor CF1B; the drain of power transistor Q4B is connected to the drain of power transistor Q5B and one end of capacitor CF2B; the source of power transistor Q6B is grounded; the drain of power transistor Q6B is connected to the source of power transistor Q7B and the other end of capacitor CF2B; the sources of power transistors Q2B, Q5B, and Q7B are all connected to the output terminal VOUT.
[0017] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:
[0018] This invention provides a power supply network structure for the drive circuit of a series-parallel switched-capacitor voltage converter, comprising: bootstrap capacitors CBST1A, CBST1B, CBST2A, CBST2B, CBST3A, CBST3B, and CBST4, and switches S1A, S1B, S2A, S2B, S3A, S3B, S4A, and S4B. The power supply network structure proposed in this invention, applied to the drive circuit of the series-parallel switched-capacitor voltage converter, draws power from the internal low-voltage power supply REGN for all drive circuits of each power transistor, eliminating the on-state voltage drop, thereby reducing the losses of the switched-capacitor voltage converter and improving its conversion efficiency. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A schematic diagram of the circuit structure of an existing series-parallel switched capacitor voltage converter;
[0021] Figure 2 This is a schematic diagram of a single-sided circuit structure of an existing series-parallel switched capacitor voltage converter with a drive circuit.
[0022] Figure 3 This is a schematic diagram of the power supply network structure of the drive circuit for the series-parallel switched capacitor voltage converter provided in an embodiment of the present invention. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] The purpose of this invention is to provide a power supply network structure for the drive circuit of a series-parallel switched capacitor voltage converter, so as to reduce the loss of the switched capacitor voltage converter and improve the conversion efficiency of the switched capacitor voltage converter by eliminating the voltage drop of the conducting tube.
[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] The power supply network structure of the drive circuit of the series-parallel switched capacitor voltage converter described in this invention is applied to... Figure 1 The series-parallel switched-capacitor voltage converter shown. See also... Figure 1The series-parallel switched-capacitor voltage converter includes power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, and Q7B, and capacitors CF1A, CF2A, CF1B, and CF2B. Power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, and Q7B are all PMOS power MOSFETs.
[0027] See Figure 1 In a series-parallel switched-capacitor voltage converter, the drain of power transistor Q1A is connected to the input terminal PMID; the source of power transistor Q1A is connected to the drain of power transistor Q2A and one end of capacitor CF1A; the source of power transistor Q3A is grounded; the drain of power transistor Q3A is connected to the source of power transistor Q4A and the other end of capacitor CF1A; the drain of power transistor Q4A is connected to the drain of power transistor Q5A and one end of capacitor CF2A; the source of power transistor Q6A is grounded; the drain of power transistor Q6A is connected to the source of power transistor Q7A and the other end of capacitor CF2A; the sources of power transistors Q2A, Q5A, and Q7A are all connected to the output terminal VOUT.
[0028] The drain of power transistor Q1B is connected to the input terminal PMID; the source of power transistor Q1B is connected to the drain of power transistor Q2B and one end of capacitor CF1B; the source of power transistor Q3B is grounded; the drain of power transistor Q3B is connected to the source of power transistor Q4B and the other end of capacitor CF1B; the drain of power transistor Q4B is connected to the drain of power transistor Q5B and one end of capacitor CF2B; the source of power transistor Q6B is grounded; the drain of power transistor Q6B is connected to the source of power transistor Q7B and the other end of capacitor CF2B; the sources of power transistors Q2B, Q5B, and Q7B are all connected to the output terminal VOUT.
[0029] In practical applications, this series-parallel switched capacitor voltage converter has Figure 2 The driving circuit structure shown includes a charge pump circuit CP, transistors MN1, MN4, MN7, and MN25, where VH and PMID represent nodes, and the voltage VH at node VH is... VH Equal to PMID node voltage V PMID Add a V DD Voltage. This part is existing technology and will not be described in detail here. Figure 3 The drive circuit structure corresponding to power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, and Q7B is simplified and represented as Driver.
[0030] Figure 3 This is a schematic diagram of the power supply network structure for the drive circuit of the series-parallel switched capacitor voltage converter provided in an embodiment of the present invention. See also... Figure 3 The power supply network structure of the drive circuit for the series-parallel switched capacitor voltage converter of the present invention includes: bootstrap capacitors CBST1A, CBST1B, CBST2A, CBST2B, CBST3A, CBST3B, and CBST4, and switches S1A, S1B, S2A, S2B, S3A, S3B, S4A, and S4B. Switches S1A, S1B, S2A, S2B, S3A, S3B, S4A, and S4B can be selected as MOSFETs.
[0031] The lower plate of the bootstrap capacitor CBST1A is connected to node C1PA, which is the connection node between the power transistor Q1A and the capacitor CF1A. The voltage at node C1PA is expressed as V. C1PA The upper plate of the bootstrap capacitor CBST1A is connected to the drive circuit of the power transistor Q1A; the upper plate of the bootstrap capacitor CBST1A is also connected to the upper plate of the bootstrap capacitor CBST4 through the switch S1A; the voltage of the upper plate of the bootstrap capacitor CBST1A is expressed as V. BST1A The voltage across the upper plate of the bootstrap capacitor CBST4 is expressed as V. BST4 The lower plate of the bootstrap capacitor CBST2A is connected to node C1NA, where node C1NA is the connection node between power transistor Q4A and capacitor CF1A. The voltage at node C1NA is expressed as V. C1NA The upper plate of the bootstrap capacitor CBST2A is connected to the drive circuit of the power transistor Q4A; the upper plate of the bootstrap capacitor CBST2A is also connected to the low-voltage power supply REGN through the switch S2A; the voltage of the upper plate of the bootstrap capacitor CBST2A is expressed as V. BST2A The internal low-voltage power supply REGN voltage is represented as V. REGN The lower plate of the bootstrap capacitor CBST3A is connected to node C2NA, where node C2NA is the connection node between power transistor Q7A and capacitor CF2A. The voltage at node C2NA is expressed as V. C2NA The upper plate of the bootstrap capacitor CBST3A is connected to the drive circuit of the power transistor Q7A; the voltage across the upper plate of the bootstrap capacitor CBST3A is expressed as V. BST3AThe upper plate of the bootstrap capacitor CBST3A is also connected to the low-voltage power supply REGN via the switch S3A. In one embodiment, the voltage of the low-voltage power supply REGN to ground can be approximately 5V; alternatively, the low-voltage power supply can be VREGN, short for Regulator N, generated by an internal linear low-dropout regulator.
[0032] Symmetrically, the lower plate of the bootstrap capacitor CBST1B is connected to node C1PB, where node C1PB is the connection node between power transistor Q1B and capacitor CF1B, and the voltage at node C1PB is expressed as V. C1PB The upper plate of the bootstrap capacitor CBST1B is connected to the drive circuit of the power transistor Q1B; the upper plate of the bootstrap capacitor CBST1B is also connected to the upper plate of the bootstrap capacitor CBST4 through the switch S1B; the voltage of the upper plate of the bootstrap capacitor CBST1B is expressed as V. BST1B The voltage across the upper plate of the bootstrap capacitor CBST4 is expressed as V. BST4 The lower plate of the bootstrap capacitor CBST2B is connected to node C1NB, where node C1NB is the connection node between power transistor Q4B and capacitor CF1B. The voltage at node C1NB is expressed as V. C1NB The upper plate of the bootstrap capacitor CBST2B is connected to the drive circuit of the power transistor Q4B; the upper plate of the bootstrap capacitor CBST2B is also connected to the low-voltage power supply REGN through the switch S2B; the voltage of the upper plate of the bootstrap capacitor CBST2B is expressed as V. BST2B The internal low-voltage power supply REGN voltage is represented as V. REGN The lower plate of the bootstrap capacitor CBST3B is connected to node C2NB, where node C2NB is the connection node between power transistor Q7B and capacitor CF2B. The voltage at node C2NB is expressed as V. C2NB The upper plate of the bootstrap capacitor CBST3B is connected to the drive circuit of the power transistor Q7B; the upper plate of the bootstrap capacitor CBST3B is also connected to the low-voltage power supply REGN through the switch S3B.
[0033] The lower plate of the bootstrap capacitor CBST4 is connected to the output terminal VOUT; the upper plate of the bootstrap capacitor CBST4 is also connected to the upper plates of the bootstrap capacitors CBST3A and CBST3B respectively via switches S4A and S4B, and the voltages of the upper plates of the bootstrap capacitors CBST3A and CBST3B are V... BST3A and V BST3B .
[0034] The driver circuits for power transistors Q2A, Q2B, Q5A, and Q5B are all connected to the upper plate of the bootstrap capacitor CBST4, i.e., all connected to the upper plate voltage V of the bootstrap capacitor CBST4.BST4 The driver circuits for the power transistors Q3A, Q3B, Q6A, and Q6B are all connected to the low-voltage power supply, specifically the internal low-voltage power supply voltage V. REGN .
[0035] visible, Figure 3 In the power supply network structure of a novel series-parallel switched capacitor converter drive circuit shown, seven bootstrap capacitors CBST1A, CBST1B, CBST2A, CBST2B, CBST3A, CBST3B, and CBST4 are used as power storage elements for the power transistor drive circuit. The lower plates of bootstrap capacitors CBST1A and CBST1B are connected to nodes C1PA and C1PB, respectively, and the upper plates of bootstrap capacitors CBST1A and CBST1B are connected to the drive circuits of power transistors Q1A and Q1B, respectively. The lower plates of bootstrap capacitors CBST2A and CBST2B are connected to nodes C1NA and C1NB, respectively, and the upper plates of bootstrap capacitors CBST2A and CBST2B are connected to the drive circuits of power transistors Q4A and Q4B, respectively. The lower plates of bootstrap capacitors CBST3A and CBST3B are connected to nodes C2NA and C2NB, respectively. The upper plates of bootstrap capacitors CBST3A and CBST3B are connected to the drivers of power transistors Q7A and Q7B, respectively. The lower plate of bootstrap capacitor CBST4 is connected to the output node VOUT. The upper plate of bootstrap capacitor CBST4 is connected to the drivers of power transistors Q2A, Q2B, Q5A, and Q5B, respectively. The upper plates of bootstrap capacitors CBST2A, CBST2B, CBST3A, and CBST3B are connected to the internal low-voltage power supply VREGN via switches S2A, S2B, S3A, and S3B, respectively. The upper plates of bootstrap capacitors CBST3A and CBST3B are also connected to the upper plate of bootstrap capacitor CBST4 via switches S4A and S4B, respectively. The upper plate of bootstrap capacitor CBST4 is in turn connected to bootstrap capacitors CBST1A and CBST1B via switches S1A and S1B, respectively, thus forming a new power supply network structure.
[0036] The driving circuits of power transistors Q1A and Q1B are powered by bootstrap capacitors CBST1A and CBST1B respectively. The driving circuits of power transistors Q3A, Q3B, Q6A, and Q6B are powered by the internal low-voltage power supply REGN. Bootstrap capacitor CBST4 powers the driving circuits of power transistors Q2A, Q2B, Q5A, and Q5B. Bootstrap capacitors CBST2A and CBST2B power the driving circuits of power transistors Q4A and Q4B respectively. Bootstrap capacitors CBST3A and CBST3B power the driving circuits of power transistors Q7A and Q7B respectively.
[0037] Current drive circuits suffer from voltage drop losses in the path, resulting in significant drive losses and low conversion efficiency in existing series-parallel switched-capacitor converters. The novel power supply network structure of the drive circuit provided by this invention eliminates the voltage drop in the drive circuit path, thereby eliminating these losses and improving the conversion efficiency of the switched-capacitor converter.
[0038] The working principle of the power supply network structure of the drive circuit of the series-parallel switched capacitor voltage converter described in this invention is explained below using a single-sided example.
[0039] Taking a single-sided example, the series-parallel switched-capacitor converter operates in two stages. In stage 1, power transistors Q1A, Q4A, and Q7A are turned on, while power transistors Q2A, Q3A, Q5A, and Q6A are turned off. The two bootstrap capacitors CF1A and CF2A are connected in series and charged along the path from the input terminal PMID to the output terminal VOUT. In stage 2, power transistors Q1A, Q4A, and Q7A are turned off, while power transistors Q2A, Q3A, Q5A, and Q6A are turned on. The two bootstrap capacitors CF1A and CF2A are connected in parallel and discharged to the output terminal VOUT.
[0040] In stage 2, switches S2A and S3A are turned on, allowing the internal low-voltage power supply REGN to charge the two bootstrap capacitors CBST2A and CBST3A through switches S2A and S3A respectively, increasing the voltage V on the upper plate. BST2A V BST3A It has remained stable at V C1NA +V REGN and V C2NA +V REGN Simultaneously, switch S1A is turned on, allowing bootstrap capacitor CBST4 to charge bootstrap capacitor CBST1A through switch S1A, thus increasing the voltage V on its upper plate. BST1A Stable at V C1PA +V BST4 .
[0041] In stage 1, switch S4A is turned on, causing bootstrap capacitor CBST3A to charge bootstrap capacitor CBST4 through switch S4A, thus increasing the voltage V on its upper plate. BST4 Stable at V OUT +V BST3A .
[0042] Combining the two stages, it can be seen that all the energy of the bootstrap capacitors comes from the internal low-voltage power supply REGN, and the drive circuits of power transistors Q1-Q7 all draw power from the respective bootstrap capacitors. Therefore, the power consumption of the drive circuit is equivalent to that from V REGN There is no additional voltage drop loss, thus reducing the loss of the switched capacitor voltage converter and improving its conversion efficiency.
[0043] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the control method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.
Claims
1. A power supply network structure for a drive circuit of a series-parallel switched-capacitor voltage converter, the series-parallel switched-capacitor voltage converter comprising power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, and Q7B, and capacitors CF1A, CF2A, CF1B, and CF2B, characterized in that, The series-parallel switched-capacitor voltage converter transfers charge from the input terminal PMID to the output terminal VOUT through capacitors CF1A / CF2A / CF1B / CF2B, achieving a 3:1 voltage-to-current conversion, i.e., the output voltage V... OUT =V IN / 3, Output current I OUT V IN and I IN These represent the input voltage and input current, respectively. The power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, and Q7B are all PMOS power MOSFETs. The drive circuit structure corresponding to power transistors Q1A, Q1B, Q2A, Q2B, Q3A, Q3B, Q4A, Q4B, Q5A, Q5B, Q6A, Q6B, Q7A, and Q7B is simplified and represented as Driver; The power supply network structure of the drive circuit of the series-parallel switched capacitor voltage converter includes: bootstrap capacitors CBST1A, CBST1B, CBST2A, CBST2B, CBST3A, CBST3B and CBST4, and switches S1A, S1B, S2A, S2B, S3A, S3B, S4A and S4B. In the power supply network structure of the drive circuit of the series-parallel switched capacitor voltage converter, seven bootstrap capacitors CBST1A, CBST1B, CBST2A, CBST2B, CBST3A, CBST3B, and CBST4 are used as power storage elements for the power transistor drive circuit driver. The lower plate of the bootstrap capacitor CBST1A is connected to node C1PA, where node C1PA is the connection node between the power transistor Q1A and the capacitor CF1A. The upper plate of the bootstrap capacitor CBST1A is connected to the drive circuit driver of the power transistor Q1A. The upper plate of the bootstrap capacitor CBST1A is also connected to the upper plate of the bootstrap capacitor CBST4 through the switch S1A. The lower plate of ST2A is connected to node C1NA, where node C1NA is the connection node between the power transistor Q4A and the capacitor CF1A; the upper plate of the bootstrap capacitor CBST2A is connected to the driver circuit of the power transistor Q4A; the upper plate of the bootstrap capacitor CBST2A is also connected to a low-voltage power supply through the switch S2A; the lower plate of the bootstrap capacitor CBST3A is connected to node C2NA, where node C2NA is the connection node between the power transistor Q7A and the capacitor CF2A; the upper plate of the bootstrap capacitor CBST3A is connected to the driver circuit of the power transistor Q7A; the upper plate of the bootstrap capacitor CBST3A is also connected to the low-voltage power supply through the switch S3A. The lower plate of the bootstrap capacitor CBST1B is connected to node C1PB, where node C1PB is the connection node between the power transistor Q1B and the capacitor CF1B; the upper plate of the bootstrap capacitor CBST1B is connected to the driver circuit of the power transistor Q1B; the upper plate of the bootstrap capacitor CBST1B is also connected to the upper plate of the bootstrap capacitor CBST4 through the switch S1B; the lower plate of the bootstrap capacitor CBST2B is connected to node C1NB, where node C1NB is the connection node between the power transistor Q4B and the capacitor CF1B; The upper plate of the bootstrap capacitor CBST2B is connected to the driver circuit of the power transistor Q4B; the upper plate of the bootstrap capacitor CBST2B is also connected to the low-voltage power supply through the switch S2B; the lower plate of the bootstrap capacitor CBST3B is connected to node C2NB, wherein node C2NB is the connection node between the power transistor Q7B and the capacitor CF2B; the upper plate of the bootstrap capacitor CBST3B is connected to the driver circuit of the power transistor Q7B; the upper plate of the bootstrap capacitor CBST3B is also connected to the low-voltage power supply through the switch S3B. The lower plate of the bootstrap capacitor CBST4 is connected to the output terminal VOUT; the upper plate of the bootstrap capacitor CBST4 is also connected to the upper plates of the bootstrap capacitors CBST3A and CBST3B respectively through the switches S4A and S4B. The low-voltage power supply, officially named Regulator N, is generated by an internal linear low-dropout regulator. The driver circuits for power transistors Q2A, Q2B, Q5A, and Q5B are all connected to the upper plate of the bootstrap capacitor CBST4, i.e., all connected to the upper plate voltage V of the bootstrap capacitor CBST4. BST4 The driver circuits for the power transistors Q3A, Q3B, Q6A, and Q6B are all connected to the low-voltage power supply, specifically the internal low-voltage power supply voltage V. REGN ; The drive circuits for power transistors Q1A and Q1B are powered by bootstrap capacitors CBST1A and CBST1B respectively. The drive circuits for power transistors Q3A, Q3B, Q6A, and Q6B are powered by the internal low-voltage power supply REGN. Bootstrap capacitor CBST4 powers the drive circuits for power transistors Q2A, Q2B, Q5A, and Q5B. Bootstrap capacitors CBST2A and CBST2B power the drive circuits for power transistors Q4A and Q4B respectively. Bootstrap capacitors CBST3A and CBST3B power the drive circuits for power transistors Q7A and Q7B respectively.
2. The power supply network structure of the drive circuit for the series-parallel switched capacitor voltage converter according to claim 1, characterized in that, The drain of power transistor Q1A is connected to the input terminal PMID; the source of power transistor Q1A is connected to the drain of power transistor Q2A and one end of capacitor CF1A; the source of power transistor Q3A is grounded; the drain of power transistor Q3A is connected to the source of power transistor Q4A and the other end of capacitor CF1A; the drain of power transistor Q4A is connected to the drain of power transistor Q5A and one end of capacitor CF2A; the source of power transistor Q6A is grounded; the drain of power transistor Q6A is connected to the source of power transistor Q7A and the other end of capacitor CF2A; the sources of power transistors Q2A, Q5A, and Q7A are all connected to the output terminal VOUT.
3. The power supply network structure of the drive circuit for the series-parallel switched capacitor voltage converter according to claim 1, characterized in that, The drain of power transistor Q1B is connected to the input terminal PMID; the source of power transistor Q1B is connected to the drain of power transistor Q2B and one end of capacitor CF1B; the source of power transistor Q3B is grounded; the drain of power transistor Q3B is connected to the source of power transistor Q4B and the other end of capacitor CF1B. The drain of power transistor Q4B is connected to the drain of power transistor Q5B and one end of capacitor CF2B, respectively; the source of power transistor Q6B is grounded; the drain of power transistor Q6B is connected to the source of power transistor Q7B and the other end of capacitor CF2B, respectively; the source of power transistor Q2B, the source of power transistor Q5B, and the drain of power transistor Q7B are all connected to the output terminal VOUT.