A dickson switched capacitor voltage converter

Abstract

This application relates to a switched-capacitor voltage converter. An inductor and several switching transistors are added between the two branches of a traditional Dickson-type switched-capacitor converter. By controlling the on and off states of these switching transistors, for a period of time after the main switching transistor is turned off, the charge on the parasitic capacitance of one branch is completely transferred to the other branch through the inductor, making the voltage difference across the main switching transistor zero. Thus, at the instant each main switching transistor is turned on, the voltage difference across each main switching transistor becomes zero, thereby reducing switching losses during transistor switching and improving the conversion efficiency of the Dickson-type switched-capacitor voltage converter.

Description

Technical Field

[0001] This application belongs to the field of switching power supply technology, specifically relating to a Dickson-type switched capacitor voltage converter. Background Technology

[0002] Dickson-type switched-capacitor voltage converters are widely used in various power management applications as a basic power conversion structure. They can convert an input DC voltage into another DC voltage output.

[0003] like Figure 1 The diagram shows a traditional Dickson 4:1 switched capacitor voltage converter. Branch A of this circuit transfers charge from the input to the output through the first switch Q1A to the eighth switch Q8A, the first capacitor CF1A, the second capacitor CF2A, and the third capacitor CF3A. Similarly, branch B transfers charge from the input to the output through the ninth switch Q1B to the sixteenth switch Q8B, the fourth capacitor CF1B, the fifth capacitor CF2B, and the sixth capacitor CF3B. Ultimately, the output voltage VOUT = VIN / 4 and the output current IOUT = 4 * IIN are achieved.

[0004] Conversion efficiency is a crucial indicator of switched-capacitor voltage converters, determining their load-carrying capacity and temperature rise. Higher conversion efficiency results in a greater load-carrying capacity and lower temperature rise. The main losses in switched-capacitor voltage converters originate from: 1) conduction losses of the individual switching transistors; 2) switching losses during transistor switching; and 3) drive losses of the individual switching transistors. Improving conversion efficiency hinges on minimizing these losses. Switching losses are directly proportional to the voltage difference across the transistors during switching; a larger voltage difference leads to greater losses. Therefore, current switched-capacitor converters suffer from low conversion efficiency and high switching losses during transistor switching, limiting their overall conversion effectiveness. Summary of the Invention

[0005] This application addresses the aforementioned problems, particularly the switching losses, by proposing a switched capacitor voltage converter that reduces the voltage difference across each switching transistor to almost zero during switching, thereby reducing switching losses and improving conversion efficiency.

[0006] To address the aforementioned problems, this application adds an inductor and several switching transistors between the two branches of a traditional Dickson-type switched-capacitor converter structure. By controlling the on and off states of these switching transistors, for a period of time after the main switching transistor is turned off, the charge on the parasitic capacitance of one branch is completely transferred to the other branch through the inductor, and the voltage difference across the main switching transistor becomes zero. Thus, at the instant each main switching transistor is turned on, the voltage difference across each main switching transistor becomes zero, thereby reducing the switching losses during switching and improving the conversion efficiency of the switched-capacitor converter.

[0007] An embodiment of this application provides a Dickson-type switched capacitor voltage converter, including an inductor branch and two branches, the two branches being a first branch and a second branch, wherein the input voltage is converted into another voltage output after passing through the two branches.

[0008] The inductor branch connects the first branch and the second branch. The switching transistors in the first branch and the second branch are the main switching transistors. The inductor branch is used to transfer the charge on the parasitic capacitance of one branch to the other branch after all the main switching transistors are turned off, so that the voltage difference across the main switching transistors becomes zero, so that the voltage difference across each main switching transistor is zero at the moment of turning on each main switching transistor.

[0009] In some embodiments, the first branch includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a first capacitor, a second capacitor, and a third capacitor; the second branch includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifteenth switch, a sixteenth switch, a fourth capacitor, a fifth capacitor, and a sixth capacitor.

[0010] The first terminal of the first switch and the first terminal of the ninth switch are the input terminals of the Dickson switched capacitor voltage converter, which are connected to an external input voltage. The second terminal of the first switch is connected to the first terminal of the second switch and the first terminal of the first capacitor, and the second terminal of the ninth switch is connected to the first terminal of the tenth switch and the first terminal of the fourth capacitor.

[0011] The second terminal of the second switch is connected to the first terminal of the third switch and the first terminal of the second capacitor, and the second terminal of the tenth switch is connected to the first terminal of the eleventh switch and the first terminal of the fifth capacitor.

[0012] The second terminal of the third switch is connected to the first terminal of the fourth switch and the first terminal of the third capacitor, and the second terminal of the eleventh switch is connected to the first terminal of the twelfth switch and the first terminal of the sixth capacitor.

[0013] The second terminal of the fourth switch is connected to the first terminal of the fifth switch and the first terminal of the seventh switch, and the second terminal of the twelfth switch is connected to the first terminal of the thirteenth switch and the first terminal of the fifteenth switch.

[0014] The second terminal of the fifth switch is connected to the second terminal of the first capacitor, the second terminal of the third capacitor, and the first terminal of the sixth switch. The second terminal of the seventh switch is connected to the second terminal of the second capacitor and the first terminal of the eighth switch. The second terminals of the sixth and eighth switches are grounded.

[0015] The second terminal of the thirteenth switch is connected to the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, and the first terminal of the fourteenth switch. The second terminal of the fifteenth switch is connected to the second terminal of the fifth capacitor and the first terminal of the sixteenth switch. The second terminals of the fourteenth and sixteenth switches are grounded.

[0016] The connection point of the second terminal of the fourth switch, the first terminal of the fifth switch, the first terminal of the seventh switch, the second terminal of the twelfth switch, the first terminal of the thirteenth switch, and the first terminal of the fifteenth switch is the output terminal of the Dickson switched capacitor voltage converter.

[0017] In some embodiments, the inductor branch includes a seventeenth switch, an eighteenth switch, a nineteenth switch, a twentieth switch, a twenty-first switch, a twenty-second switch, and an inductor.

[0018] The connection point of the second terminal of the first capacitor, the second terminal of the third capacitor, the second terminal of the fifth switch, and the first terminal of the sixth switch is the first connection point; the connection point of the second terminal of the second capacitor, the second terminal of the seventh switch, and the first terminal of the eighth switch is the second connection point.

[0019] The connection point of the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, the second terminal of the thirteenth switch, and the first terminal of the fourteenth switch is the third connection point; the connection point of the second terminal of the fifth capacitor, the second terminal of the fifteenth switch, and the first terminal of the sixteenth switch is the fourth connection point.

[0020] The first terminal of the seventeenth switch is connected to the second connection point, and the second terminal of the seventeenth switch is connected to the first terminal of the inductor, the first terminal of the eighteenth switch, and the first terminal of the nineteenth switch; the second terminal of the eighteenth switch is grounded, and the second terminal of the nineteenth switch is connected to the third connection point.

[0021] The second end of the inductor is connected to the first end of the twentieth switch, the first end of the twenty-first switch, and the first end of the twenty-second switch. The second end of the twentieth switch is connected to the fourth connection point. The second end of the twenty-first switch is grounded, and the second end of the twenty-second switch is connected to the first connection point.

[0022] In some embodiments, the first branch includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a first sub-switch, a first capacitor, a second capacitor, a third capacitor, and a first sub-capacitor; the second branch includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifteenth switch, a sixteenth switch, a second sub-switch, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a second sub-capacitor.

[0023] The first terminal of the first switch and the first terminal of the ninth switch are the input terminals of the switched capacitor voltage converter, which are connected to an external input voltage. The second terminal of the first switch is connected to the first terminal of the second switch and the first terminal of the first capacitor. The second terminal of the ninth switch is connected to the first terminal of the tenth switch and the first terminal of the fourth capacitor.

[0024] The second terminal of the second switch is connected to the first terminal of the third switch and the first terminal of the second capacitor; the second terminal of the tenth switch is connected to the first terminal of the eleventh switch and the first terminal of the fifth capacitor; the second terminal of the third switch is connected to the first terminal of the fourth switch and the first terminal of the third capacitor; and the second terminal of the eleventh switch is connected to the first terminal of the twelfth switch and the first terminal of the sixth capacitor.

[0025] The second terminal of the fourth switch is connected to the first terminal of the first sub-capacitor and the first terminal of the fifth switch; the second terminal of the twelfth switch is connected to the first terminal of the second sub-capacitor and the first terminal of the thirteenth switch; the second terminal of the fifth switch is connected to the first terminal of the sixth switch and the first terminal of the eighth switch; the second terminal of the sixth switch is connected to the first terminal of the seventh switch, the second terminal of the first sub-capacitor, and the second terminal of the second capacitor; the second terminal of the eighth switch is connected to the second terminal of the first capacitor, the second terminal of the third capacitor, and the first terminal of the first sub-switch; the second terminals of the seventh switch and the first sub-switch are both grounded.

[0026] The second terminal of the thirteenth switch is connected to the first terminal of the fourteenth switch and the first terminal of the sixteenth switch. The second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch, the second terminal of the second sub-capacitor, and the second terminal of the fifth capacitor. The second terminal of the sixteenth switch is connected to the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, and the first terminal of the second sub-switch. The second terminal of the fifteenth switch and the second terminal of the second sub-switch are both grounded.

[0027] The connection point of the second terminal of the fifth switch, the first terminal of the sixth switch, the first terminal of the eighth switch, the second terminal of the thirteenth switch, the first terminal of the fourteenth switch, and the first terminal of the sixteenth switch is the output terminal of the Dickson switched capacitor voltage converter.

[0028] In some embodiments, the connection point of the second terminal of the first capacitor, the second terminal of the third capacitor, the second terminal of the eighth switch, and the first terminal of the first sub-switch is a first connection point; the connection point of the second terminal of the second capacitor, the second terminal of the first sub-capacitor, the second terminal of the sixth switch, and the first terminal of the seventh switch is a second connection point; the connection point of the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, the second terminal of the sixteenth switch, and the first terminal of the second sub-switch is a third connection point; and the connection point of the second terminal of the fifth capacitor, the second terminal of the second sub-capacitor, the second terminal of the fourteenth switch, and the first terminal of the fifteenth switch is a fourth connection point.

[0029] The first terminal of the seventeenth switch is connected to the first connection point, and the second terminal of the seventeenth switch is connected to the first terminal of the inductor, the first terminal of the eighteenth switch, and the first terminal of the nineteenth switch; the second terminal of the eighteenth switch is grounded, and the second terminal of the nineteenth switch is connected to the fourth connection point.

[0030] The second end of the inductor is connected to the first end of the twentieth switch, the first end of the twenty-first switch, and the first end of the twenty-second switch. The second end of the twentieth switch is connected to the third connection point. The second end of the twenty-first switch is grounded, and the second end of the twenty-second switch is connected to the second connection point.

[0031] In some embodiments, one duty cycle of a Dickson-type switched-capacitor voltage converter comprises four phases, as described below.

[0032] Phase 1: Switches 1, 3, 5, 8, 10, 12, 14, 15, 17, 19, and 21 are all on, while the other switches are off; the input voltage is connected to the output terminal through capacitor 1, capacitor 3 in series with the output terminal, then in parallel with capacitor 2, capacitor 6 in parallel with the output terminal, capacitor 5 in series with the output terminal, then in parallel with capacitor 4; the inductor current is 0.

[0033] Second phase: The seventeenth, nineteenth, twentieth and twenty-second switches are all turned on, and the other switches are turned off; the inductor current first increases and then decreases until the inductor current drops to 0, and the second phase ends.

[0034] Third phase: The second, fourth, sixth, seventh, ninth, eleventh, thirteenth, sixteenth, eighteenth, twentieth, and twenty-second switches are all turned on, while the other switches are turned off; the third capacitor is connected in parallel to the output terminal, the second capacitor is connected in series to the output terminal, and then connected in parallel with the first capacitor; the input voltage is connected to the output terminal through the fourth capacitor, the sixth capacitor is connected in series to the output terminal, and then connected in parallel with the fifth capacitor; the inductor current is 0.

[0035] Fourth phase: The seventeenth, nineteenth, twentieth and twenty-second switches are all turned on, and the other switches are turned off; the inductor current first increases and then decreases until the inductor current drops to 0, the fourth phase ends and the first phase begins.

[0036] In some embodiments, one duty cycle of a Dickson-type switched-capacitor voltage converter comprises four phases, as described below.

[0037] Phase 1: Switches 1, 3, 5, 8, 10, 12, 14, 15, 18, and 21 are all on, while the other switches are off; the input voltage is connected to the output terminal through capacitor 1, capacitor 3 in series with the output terminal, then in parallel with capacitor 2, capacitor 6 in parallel with the output terminal, capacitor 5 in series with the output terminal, then in parallel with capacitor 4; the inductor current is 0.

[0038] Second phase: The seventeenth, nineteenth, twentieth and twenty-second switches are all turned on, and the other switches are turned off; the inductor current first increases and then decreases until the inductor current drops to 0, and the second phase ends.

[0039] Third phase: The second, fourth, sixth, seventh, ninth, eleventh, thirteenth, sixteenth, eighteenth, and twenty-first switches are all turned on, while the other switches are turned off; the third capacitor is connected in parallel to the output terminal, the second capacitor is connected in series to the output terminal, and then connected in parallel with the first capacitor; the input voltage is connected to the output terminal through the fourth capacitor, the sixth capacitor is connected in series to the output terminal, and then connected in parallel with the fifth capacitor; the inductor current is 0.

[0040] Fourth Phase: Switches 17, 19, 20, and 22 are all turned on, while the other switches are turned off; the inductor current first increases and then decreases until it drops to 0, ending the fourth phase and beginning the first phase. This application adds an inductor and several switches between the two branches of a traditional Dickson-type switched-capacitor converter, controlling the on / off state of these switches. During a short period when all main switches are off, the charge on the parasitic capacitance of one branch is completely transferred to the other branch through the inductor, thus achieving zero-voltage switching of all main switches. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the circuit structure of a traditional Dickson-type 4:1 switched capacitor voltage converter.

[0043] Figure 2 This is a schematic diagram of the circuit structure of a Dickson-type 4:1 switched capacitor voltage converter provided in an embodiment of this application.

[0044] Figure 3 This is the first working timing diagram provided for this application.

[0045] Figure 4 for Figure 3 The diagram shows the working state of the first phase in the first working timing sequence.

[0046] Figure 5 for Figure 3 The diagram shows the working state of the second phase in the first working sequence.

[0047] Figure 6 for Figure 3 The diagram shows the working state of the third phase in the first working timing sequence.

[0048] Figure 7 for Figure 3 The diagram shows the working state of the fourth phase in the first working timing sequence.

[0049] Figure 8 This is a second working timing diagram provided for this application.

[0050] Figure 9 for Figure 8 The diagram shows the working state of the first phase in the second working timing sequence.

[0051] Figure 10 for Figure 8 The diagram shows the working state of the second phase in the second working sequence.

[0052] Figure 11 for Figure 8 The diagram shows the working state of the third phase in the second working timing sequence.

[0053] Figure 12 for Figure 8 The diagram shows the working state of the fourth phase in the second working timing sequence.

[0054] Figure 13 This is a schematic diagram of the circuit structure of a Dickson-type 5:1 switched capacitor voltage converter provided in an embodiment of this application. Detailed Implementation

[0055] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in the embodiments of this application can be combined with each other.

[0056] Figure 2 This application provides a schematic diagram of the circuit structure of a dual-branch Dickson 4:1 switched capacitor voltage converter. The dual-branch Dickson 4:1 switched capacitor voltage converter has an inductor branch and two branches, which include a first branch and a second branch.

[0057] The first branch includes the first switch Q1A, the second switch Q2A, the third switch Q3A, the fourth switch Q4A, the fifth switch Q5A, the sixth switch Q6A, the seventh switch Q7A, the eighth switch Q8A, the first capacitor CF1A, the second capacitor CF2A, and the third capacitor CF3A. The second branch includes the ninth switch Q1B, the tenth switch Q2B, the eleventh switch Q3B, the twelfth switch Q4B, the thirteenth switch Q5B, the fourteenth switch Q6B, the fifteenth switch Q7B, the sixteenth switch Q8B, the fourth capacitor CF1B, the fifth capacitor CF2B, and the sixth capacitor CF3B. All the switching transistors on the first and second branches are main switching transistors, and each main switching transistor has parasitic capacitance. For example, the first switching transistor Q1A, the second switching transistor Q2A, the third switching transistor Q3A, the fourth switching transistor Q4A, the fifth switching transistor Q5A, the sixth switching transistor Q6A, the seventh switching transistor Q7A, the eighth switching transistor Q8A, the ninth switching transistor Q1B, the tenth switching transistor Q2B, the eleventh switching transistor Q3B, the twelfth switching transistor Q4B, the thirteenth switching transistor Q5B, the fourteenth switching transistor Q6B, the fifteenth switching transistor Q7B, and the sixteenth switching transistor Q8B all have parasitic capacitance.

[0058] The input voltage is VIN, which is connected to GND through capacitor CIN. VIN is connected to node C1PA through the first switch Q1A. Node C1PA is connected to node C2PA through the second switch Q2A. Node C1PA is also connected to the first connection point C1NA through the first capacitor CF1A. Node C2PA is connected to node C3PA through the third switch Q3A. Node C2PA is also connected to the second connection point C2NA through the second capacitor CF2A. Node C3PA is connected to the output voltage VOUT through the fourth switch Q4A. Node C3PA is also connected to the first connection point C1NA through the third capacitor CF3A. A fifth switch Q5A is connected between the output voltage VOUT and the first connection point C1NA. The first connection point C1NA is connected to GND through the sixth switch Q6A. A seventh switch Q7A is connected between the output voltage VOUT and the second connection point C2NA. The second connection point C2NA is connected to GND through the eighth switch Q8A.

[0059] Similarly, VIN is connected to node C1PB via the ninth switch Q1B. Node C1PB is connected to node C2PB via the tenth switch Q2B. Node C1PB is also connected to the third connection point C1NB via the fourth capacitor CF1B. Node C2PB is connected to node C3PB via the eleventh switch Q3B. Node C2PB is also connected to the fourth connection point C2NB via the fifth capacitor CF2B. Node C3PB is connected to the output voltage VOUT via the twelfth switch Q4B. Node C3PB is also connected to the third connection point C1NB via the sixth capacitor CF3B. The thirteenth switch Q5B is connected between the output voltage VOUT and the third connection point C1NB. The third connection point C1NB is connected to GND via the fourteenth switch Q6B. The fifteenth switch Q7B is connected between the output voltage VOUT and the fourth connection point C2NB. The fourth connection point C2NB is connected to GND via the sixteenth switch Q8B.

[0060] The output voltage VOUT is grounded through capacitor COUT, and there is a load resistor ROUT between VOUT and GND.

[0061] The inductor branch connects between the two branches of the dual-branch Dickson 4:1 switched-capacitor voltage converter. The inductor branch includes the seventeenth switch QX1A, eighteenth switch QX2A, nineteenth switch QX3A, twentieth switch QX1B, twenty-first switch QX2B, twenty-second switch QX3B, and inductor L0. The second connection point C2NA is connected to node LXA via the seventeenth switch QX1A. The third connection point C1NB is connected to node LXA via the nineteenth switch QX3A. Node LXA is connected to GND via the eighteenth switch QX2A. The fourth connection point C2NB is connected to node LXB via the twentieth switch QX1B. The first connection point C1NA is connected to node LXB via the twenty-second switch QX3B. Node LXB is connected to GND via the twenty-first switch QX2B. Nodes LXA and LXB are connected via inductor L0.

[0062] Figure 3 The operating timing of the dual-branch Dickson 4:1 switching voltage converter in this application embodiment has four operating states in sequence within one operating cycle: phase 1 (T0~T1), phase 2 (T1~T2), phase 3 (T2~T3), and phase 4 (T3~T4).

[0063] The voltage diagrams corresponding to Q1A, Q2A, Q3A, Q4A, Q5A, Q6A, Q7A, and Q8A represent the switching states of the first switch Q1A, the second switch Q2A, the third switch Q3A, the fourth switch Q4A, the fifth switch Q5A, the sixth switch Q6A, the seventh switch Q7A, and the eighth switch Q8A, respectively. The voltage diagrams corresponding to Q1B, Q2B, Q3B, Q4B, Q5B, Q6B, Q7B, and Q8B represent the switching states of the ninth switch Q1B, the tenth switch Q2B, the eleventh switch Q3B, the twelfth switch Q4B, the thirteenth switch Q5B, the fourteenth switch Q6B, the fifteenth switch Q7B, and the sixteenth switch Q8B, respectively. (The last sentence appears to be incomplete and possibly refers to QX1.) The voltage diagrams for A, QX2A, QX3A, QX1B, QX2B, and QX3B represent the switching states of the seventeenth switch QX1A, the eighteenth switch QX2A, the nineteenth switch QX3A, the twentieth switch QX1B, the twenty-first switch QX2B, and the twenty-second switch QX3B, respectively. The voltage diagrams corresponding to C1NA and C2NB are the voltage waveforms of the first connection point C1NA and the fourth connection point C2NB, respectively. The voltage diagrams corresponding to C2NA and C1NB are the voltage waveforms of the second connection point C2NA and the third connection point C1NB, respectively. The voltage diagrams corresponding to LXA and LXB are the voltage waveforms of nodes LXA and LXB, respectively. The current diagram corresponding to I_L0 is the current waveform of inductor L0.

[0064] Figure 4The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 1 (T0~T1) according to an embodiment of this application. The first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are all turned on, while the second switch Q2A, fourth switch Q4A, sixth switch Q6A, and seventh switch Q7A are all turned off. The input voltage VIN is connected to the output voltage VOUT through the first capacitor CF1A, and the third capacitor CF3A is connected in series with the output voltage VOUT, and then connected in parallel with the second capacitor CF2A. The ninth switch Q1B, eleventh switch Q3B, thirteenth switch Q5B, and sixteenth switch Q8B are turned off, while the tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, and fifteenth switch Q7B are turned on. The sixth capacitor CF3B is connected in parallel with the output voltage VOUT, and the fifth capacitor CF2B is connected in series with the output voltage VOUT, and then connected in parallel with the fourth capacitor CF1B. The seventeenth switch QX1A, the nineteenth switch QX3A, and the twenty-first switch QX2B are turned on, while the twentieth switch QX1B, the twenty-second switch QX3B, and the eighteenth switch QX2A are turned off. The second connection point C2NA is connected to GND through the seventeenth switch QX1A, inductor L0, and the twenty-first switch QX2B. The third connection point C1NB is connected to GND through the nineteenth switch QX3A, inductor L0, and the twenty-first switch QX2B.At the start of phase 1, the voltage at the second connection point C2NA is zero, the voltage at the first connection point C1NA is the output voltage VOUT, the voltages at nodes C2PA and C3PA are both twice the output voltage 2*VOUT, and the voltage at node C1PA is the input voltage VIN. Before the eighth switch Q8A, the fifth switch Q5A, the third switch Q3A, and the first switch Q1A are turned on, the voltage differences across the eighth switch Q8A, the fifth switch Q5A, the third switch Q3A, and the first switch Q1A are all zero. Before and after the switches are turned on, the voltage differences across the eighth switch Q8A, the fifth switch Q5A, the third switch Q3A, and the first switch Q1A remain unchanged. The voltage at connection point C2NB is the output voltage VOUT, the voltage at connection point C1NB is zero, the voltage at node C3PB is the output voltage VOUT, and the voltages at nodes C1PB and C2PB are both three times the output voltage 3*VOUT. Before the fifteenth switch Q7B, fourteenth switch Q6B, twelfth switch Q4B, and tenth switch Q2B are turned on, the voltage differences across the fifteenth switch Q7B, fourteenth switch Q6B, twelfth switch Q4B, and tenth switch Q2B are all zero. Before and after the switches are turned on, the voltage differences across the fifteenth switch Q7B, fourteenth switch Q6B, twelfth switch Q4B, and tenth switch Q2B do not change. In phase 1, the voltage at the first connection point C1NA and the voltage at the fourth connection point C2NB are both equal to the output voltage VOUT, the voltage at the second connection point C2NA and the voltage at the third connection point C1NB are both equal to zero, the voltage at node LXA and the voltage at node LXB are both equal to zero, and the current in inductor L0 is zero.

[0065] Figure 5The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 2 (T1~T2) according to an embodiment of this application. The switches are: first switch Q1A, second switch Q2A, third switch Q3A, fourth switch Q4A, fifth switch Q5A, sixth switch Q6A, seventh switch Q7A, eighth switch Q8A, ninth switch Q1B, tenth switch Q2B, eleventh switch Q3B, twelfth switch Q4B, thirteenth switch Q5B, fourteenth switch Q6B, fifteenth switch Q7B, sixteenth switch Q8B, eighteenth switch QX2A, and twenty-first switch. QX2B is turned off, and the seventeenth switch QX1A, nineteenth switch QX3A, twentieth switch QX1B, and twenty-second switch QX3B are all turned on. The second connection point C2NA and the third connection point C1NB are connected to the first terminal of inductor L0 through the seventeenth switch QX1A and the nineteenth switch QX3A, respectively. The fourth connection point C2NB and the first connection point C1NA are connected to the second terminal of inductor L0 through the twentieth switch QX1B and the twenty-second switch QX3B, respectively. At the start of phase 2, the voltage at the fourth connection point C2NB and the voltage at the first connection point C1NA are both equal to the output voltage VOUT, while the voltages at the second connection point C2NA and the third connection point C1NB are both zero. When the high-voltage fourth connection point C2NB and the first connection point C1NA are connected to the zero-voltage second connection point C2NA and the third connection point C1NB through inductor L0, the current in inductor L0 flows from node LXB to node LXA, and the current in inductor L0 begins to increase. The voltages at the fourth connection point C2NB and the first connection point C1NA both decrease, while the voltages at the second connection point C2NA and the third connection point C1NB both increase. When the voltages at the fourth connection point C2NB, the first connection point C1NA, the second connection point C2NA, and the third connection point C1NB are all equal, the current in inductor L0 reaches its maximum, and then the current in inductor L0 begins to decrease. When the current in inductor L0 drops to zero, the voltage at the fourth connection point C2NB and the voltage at the first connection point C1NA both drop to zero. The voltage at the second connection point C2NA and the voltage at the third connection point C1NB both rise to the output voltage VOUT. At the same time, the voltage at node C2PB drops to 2*VOUT, the voltage at node C1PA drops to 3*VOUT, the voltage at node C3PA drops to VOUT, the voltage at node C2PA rises to 3*VOUT, the voltage at node C1PB rises to the input voltage VIN, and the voltage at node C3PB rises to 2*VOUT. At this point, the controller ends phase 2 and begins phase 3.

[0066] Figure 6The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 3 (T2~T3) according to an embodiment of this application. The first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are all off. The second switch Q2A, fourth switch Q4A, sixth switch Q6A, and seventh switch Q7A are all on. The third capacitor CF3A is connected in parallel to the output voltage VOUT, and the second capacitor CF2A is connected in series to the output voltage VOUT, and then connected in parallel with the first capacitor CF1A. The ninth switch Q1B, eleventh switch Q3B, thirteenth switch Q5B, and sixteenth switch Q8B are all on. The tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, and fifteenth switch Q7B are all off. The input voltage VIN is connected to the output voltage VOUT through the fourth capacitor CF1B, and the sixth capacitor CF3B is connected in series to the output voltage VOUT, and then connected in parallel with the fifth capacitor CF2B. The seventeenth switch QX1A, the nineteenth switch QX3A, and the twenty-first switch QX2B are all off, while the twentieth switch QX1B, the twenty-second switch QX3B, and the eighteenth switch QX2A are all on. The fourth connection point C2NB is connected to GND through the twentieth switch QX1B, inductor L0, and the eighteenth switch QX2A. The first connection point C1NA is connected to GND through the twenty-second switch QX3B, inductor L0, and the eighteenth switch QX2A.At the start of phase 3, the voltage at the first connection point C1NA is zero, the voltage at the second connection point C2NA is the output voltage VOUT, the voltages at nodes C1PA and C2PA are both three times the output voltage 3*VOUT, and the voltage at node C3PA is the output voltage VOUT. Before the sixth switch Q6A, the seventh switch Q7A, the second switch Q2A, and the fourth switch Q4A are turned on, the voltage differences across the sixth switch Q6A, the seventh switch Q7A, the second switch Q2A, and the fourth switch Q4A are all zero. Before and after the switches are turned on, the voltage differences across the sixth switch Q6A, the seventh switch Q7A, the second switch Q2A, and the fourth switch Q4A do not change. The voltage at the third connection point C1NB is the output voltage VOUT, the voltage at the fourth connection point C2NB is zero, the voltages at nodes C2PB and C3PB are both three times the output voltage 3*VOUT, and the voltage at node C1PB is the input voltage VIN. Before the thirteenth switch Q5B, the sixteenth switch Q8B, the eleventh switch Q3B, and the ninth switch Q1B are turned on, the voltage differences across the thirteenth switch Q5B, the sixteenth switch Q8B, the eleventh switch Q3B, and the ninth switch Q1B are all zero. Before and after the switches are turned on, the voltage differences across the thirteenth switch Q5B, the sixteenth switch Q8B, the eleventh switch Q3B, and the ninth switch Q1B do not change. In phase 3, the voltage at the third connection point C1NB and the voltage at the second connection point C2NA are both equal to the output voltage VOUT. The voltage at the fourth connection point C2NB and the voltage at the first connection point C1NA are both equal to zero. The voltage at node LXA and the voltage at node LXB are both equal to zero. The current in inductor L0 is zero.

[0067] Figure 7The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 4 (T3~T4) according to an embodiment of this application. The switches are: first switch Q1A, second switch Q2A, third switch Q3A, fourth switch Q4A, fifth switch Q5A, sixth switch Q6A, seventh switch Q7A, eighth switch Q8A, ninth switch Q1B, tenth switch Q2B, eleventh switch Q3B, twelfth switch Q4B, thirteenth switch Q5B, fourteenth switch Q6B, fifteenth switch Q7B, sixteenth switch Q8B, eighteenth switch QX2A, and twenty-first switch QX2A. When all transistors QX2B are off, the seventeenth switch QX1A, the nineteenth switch QX3A, the twentieth switch QX1B, and the twenty-second switch QX3B are all on. The second connection point C2NA and the third connection point C1NB are connected to the first terminal of inductor L0 through the seventeenth switch QX1A and the nineteenth switch QX3A, respectively. The fourth connection point C2NB and the first connection point C1NA are connected to the second terminal of inductor L0 through the twentieth switch QX1B and the twenty-second switch QX3B, respectively. At the start of phase 4, the voltages at the second connection point C2NA and the third connection point C1NB are both equal to the output voltage VOUT, while the voltages at the fourth connection point C2NB and the first connection point C1NA are both zero. When the high-voltage second connection point C2NA and the third connection point C1NB are connected to the zero-voltage fourth connection point C2NB and the first connection point C1NA through inductor L0, the current in inductor L0 flows from node LXA to node LXB, and the current in inductor L0 begins to increase. The voltages at the second connection point C2NA and the third connection point C1NB both decrease, while the voltages at the fourth connection point C2NB and the first connection point C1NA both increase. When the voltages at the second connection point C2NA, the third connection point C1NB, the fourth connection point C2NB, and the first connection point C1NA are all equal, the current in inductor L0 reaches its maximum, and then the current in inductor L0 begins to decrease. When the current in inductor L0 drops to zero, the voltage at the second connection point C2NA and the voltage at the third connection point C1NB both drop to zero. The voltage at the fourth connection point C2NB and the voltage at the first connection point C1NA both rise to the output voltage VOUT. At the same time, the voltage at node C2PA drops to 2*VOUT, the voltage at node C1PB drops to 3*VOUT, the voltage at node C3PB drops to VOUT, the voltage at node C2PB rises to 3*VOUT, the voltage at node C1PA rises to the input voltage VIN, and the voltage at node C3PA rises to 2*VOUT. At this point, the controller ends phase 4 and begins phase 1.

[0068] As described above, the Dickson-type switched-capacitor converter of this application, by controlling the seventeenth switch QX1A, eighteenth switch QX2A, nineteenth switch QX3A, twentieth switch QX1B, twenty-first switch QX2B, and twenty-second switch QX3B, in the operating state of phase 2, transfers all the charge of the first connection point C1NA, node C1PA, node C3PA, fourth connection point C2NB, and node C2PB through inductor L0 to the third connection point C1NB, node C1PB, node C3PB, second connection point C2NA, and node C2PA, so that in phase 2... Under the operating state of 3, before the second switch Q2A, the fourth switch Q4A, the sixth switch Q6A, the seventh switch Q7A, the ninth switch Q1B, the eleventh switch Q3B, the thirteenth switch Q5B, and the sixteenth switch Q8B are turned on, the voltage difference across the second switch Q2A, the fourth switch Q4A, the sixth switch Q6A, the seventh switch Q7A, the ninth switch Q1B, the eleventh switch Q3B, the thirteenth switch Q5B, and the sixteenth switch Q8B are all zero. In phase 4, the charges at the third connection point C1NB, node C1PB, node C3PB, second connection point C2NA, and node C2PA are all transferred through inductor L0 to the first connection point C1NA, node C1PA, node C3PA, fourth connection point C2NB, and node C2PB. This ensures that in phase 1, before the tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, fifteenth switch Q7B, first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are turned on, the voltage differences across the tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, fifteenth switch Q7B, first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are all zero. Before the first switch Q1A to the eighth switch Q8A and the ninth switch Q1B to the sixteenth switch Q8B are turned on, the voltage difference across each switch is zero, which reduces the switching losses of the switches and improves the conversion efficiency of the Dickson switched capacitor voltage converter.

[0069] Figure 2 The switched capacitor voltage converter shown can also be configured as follows: Figure 8 The working sequence shown has four working states in sequence within one working cycle: phase 1 (T0~T1), phase 2 (T1~T2), phase 3 (T2~T3), and phase 4 (T3~T4). Figure 3The main difference lies in the control timing of the seventeenth switch QX1A, the twentieth switch QX1B, the eighteenth switch QX2A, the twenty-first switch QX2B, the nineteenth switch QX3A, and the twenty-second switch QX3B. This control method can also achieve the effect of reducing the voltage difference across each switch to zero before the first switch Q1A to the eighth switch Q8A and the ninth switch Q1B to the sixteenth switch Q8B are turned on.

[0070] Figure 9The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 1 (T0~T1) according to an embodiment of the application. The first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are all turned on, while the second switch Q2A, fourth switch Q4A, sixth switch Q6A, and seventh switch Q7A are all turned off. The input voltage VIN is connected to the output voltage VOUT through the first capacitor CF1A, and the third capacitor CF3A is connected in series with the output voltage VOUT, and then connected in parallel with the second capacitor CF2A. The ninth switch Q1B, eleventh switch Q3B, thirteenth switch Q5B, and sixteenth switch Q8B are all turned off, while the tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, and fifteenth switch Q7B are all turned on. The sixth capacitor CF3B is connected in parallel with the output voltage VOUT, and the fifth capacitor CF2B is connected in series with the output voltage VOUT, and then connected in parallel with the fourth capacitor CF1B. The eighteenth switch QX2A and the twenty-first switch QX2B are turned on, while the seventeenth switch QX1A, the twentieth switch QX1B, the nineteenth switch QX3A, and the twenty-second switch QX3B are all turned off. Node LXA is connected to GND through the eighteenth switch QX2A, and node LXB is connected to GND through the twenty-first switch QX2B. At the start of phase 1, the voltage at the second connection point C2NA is zero, the voltage at the first connection point C1NA is the output voltage VOUT, the voltages at nodes C2PA and C3PA are both twice the output voltage 2*VOUT, and the voltage at node C1PA is the input voltage VIN. Before the eighth switch Q8A, the fifth switch Q5A, the third switch Q3A, and the first switch Q1A are turned on, the voltage differences across the eighth switch Q8A, the fifth switch Q5A, the third switch Q3A, and the first switch Q1A are all zero. Before and after the switches are turned on, the voltage differences across the eighth switch Q8A, the fifth switch Q5A, the third switch Q3A, and the first switch Q1A remain unchanged. The voltage at connection point C2NB is the output voltage VOUT, the voltage at connection point C1NB is zero, the voltage at node C3PB is the output voltage VOUT, and the voltages at nodes C1PB and C2PB are both three times the output voltage 3*VOUT. Before the fifteenth switch Q7B, fourteenth switch Q6B, twelfth switch Q4B, and tenth switch Q2B are turned on, the voltage differences across the fifteenth switch Q7B, fourteenth switch Q6B, twelfth switch Q4B, and tenth switch Q2B are all zero. Before and after the switches are turned on, the voltage differences across the fifteenth switch Q7B, fourteenth switch Q6B, twelfth switch Q4B, and tenth switch Q2B do not change.In phase 1, the voltage at the first connection point C1NA and the voltage at the fourth connection point C2NB are both equal to the output voltage VOUT, the voltage at the second connection point C2NA and the voltage at the third connection point C1NB are both equal to zero, the voltage at node LXA and the voltage at node LXB are both equal to zero, and the current in inductor L0 is zero.

[0071] Figure 10The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 2 (T1~T2) according to an embodiment of the application. The switches are: first switch Q1A, second switch Q2A, third switch Q3A, fourth switch Q4A, fifth switch Q5A, sixth switch Q6A, seventh switch Q7A, eighth switch Q8A, ninth switch Q1B, tenth switch Q2B, eleventh switch Q3B, twelfth switch Q4B, thirteenth switch Q5B, fourteenth switch Q6B, fifteenth switch Q7B, sixteenth switch Q8B, eighteenth switch QX2A, and twenty-first switch. QX2B is turned off, and the seventeenth switch QX1A, nineteenth switch QX3A, twentieth switch QX1B, and twenty-second switch QX3B are all turned on. The second connection point C2NA and the third connection point C1NB are connected to the first end of inductor L0 through the seventeenth switch QX1A and the nineteenth switch QX3A, respectively. The fourth connection point C2NB and the first connection point C1NA are connected to the second end of inductor L0 through the twentieth switch QX1B and the twenty-second switch QX3B, respectively. At the start of phase 2, the voltage at the fourth connection point C2NB and the voltage at the first connection point C1NA are both equal to the output voltage VOUT, while the voltages at the second connection point C2NA and the third connection point C1NB are both zero. When the high-voltage fourth connection point C2NB and the first connection point C1NA are connected to the zero-voltage second connection point C2NA and the third connection point C1NB through inductor L0, the current in inductor L0 flows from node LXB to node LXA, and the current in inductor L0 begins to increase. The voltages at the fourth connection point C2NB and the first connection point C1NA both decrease, while the voltages at the second connection point C2NA and the third connection point C1NB both increase. When the voltages at the fourth connection point C2NB, the first connection point C1NA, the second connection point C2NA, and the third connection point C1NB are all equal, the current in inductor L0 reaches its maximum, and then the current in inductor L0 begins to decrease. When the current in inductor L0 drops to zero, the voltage at the fourth connection point C2NB and the voltage at the first connection point C1NA both drop to zero. The voltage at the second connection point C2NA and the voltage at the third connection point C1NB both rise to the output voltage VOUT. At the same time, the voltage at node C2PB drops to 2*VOUT, the voltage at node C1PA drops to 3*VOUT, the voltage at node C3PA drops to VOUT, the voltage at node C2PA rises to 3*VOUT, the voltage at node C1PB rises to the input voltage VIN, and the voltage at node C3PB rises to 2*VOUT. At this point, the controller ends phase 2 and begins phase 3.

[0072] Figure 11The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 3 (T2~T3) according to an embodiment of the application. The first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are all off. The second switch Q2A, fourth switch Q4A, sixth switch Q6A, and seventh switch Q7A are all on. The third capacitor CF3A is connected in parallel to the output voltage VOUT, and the second capacitor CF2A is connected in series to the output voltage VOUT, and then connected in parallel with the first capacitor CF1A. The ninth switch Q1B, eleventh switch Q3B, thirteenth switch Q5B, and sixteenth switch Q8B are all on. The tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, and fifteenth switch Q7B are all off. The input voltage VIN is connected to the output voltage VOUT through the fourth capacitor CF1B. The sixth capacitor CF3B is connected in series to the output voltage VOUT, and then connected in parallel with the fifth capacitor CF2B. The seventeenth switch QX1A, the nineteenth switch QX3A, the twentieth switch QX1B, and the twenty-second switch QX3B are all turned off, while the eighteenth switch QX2A and the twenty-first switch QX2B are turned on. Node LXA is connected to GND through the eighteenth switch QX2A, and node LXB is connected to GND through the twenty-first switch QX2B. At the start of phase 3, the voltage at the first connection point C1NA is zero, the voltage at the second connection point C2NA is the output voltage VOUT, the voltages at nodes C1PA and C2PA are both three times the output voltage 3*VOUT, and the voltage at node C3PA is the output voltage VOUT. Before the sixth switch Q6A, the seventh switch Q7A, the second switch Q2A, and the fourth switch Q4A are turned on, the voltage differences across the sixth switch Q6A, the seventh switch Q7A, the second switch Q2A, and the fourth switch Q4A are all zero. Before and after the switches are turned on, the voltage differences across the sixth switch Q6A, the seventh switch Q7A, the second switch Q2A, and the fourth switch Q4A do not change. The voltage at the third connection point C1NB is the output voltage VOUT, the voltage at the fourth connection point C2NB is zero, the voltages at nodes C2PB and C3PB are both three times the output voltage 3*VOUT, and the voltage at node C1PB is the input voltage VIN. Before the thirteenth switch Q5B, the sixteenth switch Q8B, the eleventh switch Q3B, and the ninth switch Q1B are turned on, the voltage differences across the thirteenth switch Q5B, the sixteenth switch Q8B, the eleventh switch Q3B, and the ninth switch Q1B are all zero. Before and after the switches are turned on, the voltage differences across the thirteenth switch Q5B, the sixteenth switch Q8B, the eleventh switch Q3B, and the ninth switch Q1B do not change.In phase 3, the voltage at the third connection point C1NB and the voltage at the second connection point C2NA are both equal to the output voltage VOUT. The voltages at the fourth connection point C2NB and the first connection point C1NA are both zero. The voltages at nodes LXA and LXB are both zero. The current in inductor L0 is zero.

[0073] Figure 12The diagram shows the operating state of the Dickson-type switched-capacitor converter in phase 4 (T3~T4) according to an embodiment of the application. The switches are: first switch Q1A, second switch Q2A, third switch Q3A, fourth switch Q4A, fifth switch Q5A, sixth switch Q6A, seventh switch Q7A, eighth switch Q8A, ninth switch Q1B, tenth switch Q2B, eleventh switch Q3B, twelfth switch Q4B, thirteenth switch Q5B, fourteenth switch Q6B, fifteenth switch Q7B, sixteenth switch Q8B, eighteenth switch QX2A, and twenty-first switch QX2A. When all transistors QX2B are off, the seventeenth switch QX1A, the nineteenth switch QX3A, the twentieth switch QX1B, and the twenty-second switch QX3B are all on. The second connection point C2NA and the third connection point C1NB are connected to the first terminal of inductor L0 through the seventeenth switch QX1A and the nineteenth switch QX3A, respectively. The fourth connection point C2NB and the first connection point C1NA are connected to the second terminal of inductor L0 through the twentieth switch QX1B and the twenty-second switch QX3B, respectively. At the start of phase 4, the voltages at the second connection point C2NA and the third connection point C1NB are both equal to the output voltage VOUT, while the voltages at the fourth connection point C2NB and the first connection point C1NA are both zero. When the high-voltage second connection point C2NA and the third connection point C1NB are connected to the zero-voltage fourth connection point C2NB and the first connection point C1NA through inductor L0, the current in inductor L0 flows from node LXA to node LXB, and the current in inductor L0 begins to increase. The voltages at the second connection point C2NA and the third connection point C1NB both decrease, while the voltages at the fourth connection point C2NB and the first connection point C1NA both increase. When the voltages at the second connection point C2NA, the third connection point C1NB, the fourth connection point C2NB, and the first connection point C1NA are all equal, the current in inductor L0 reaches its maximum, and then the current in inductor L0 begins to decrease. When the current in inductor L0 drops to zero, the voltage at the second connection point C2NA and the voltage at the third connection point C1NB drop to zero. The voltage at the fourth connection point C2NB and the voltage at the first connection point C1NA both rise to the output voltage VOUT. At the same time, the voltage at node C2PA drops to 2*VOUT, the voltage at node C1PB drops to 3*VOUT, the voltage at node C3PB drops to VOUT, the voltage at node C2PB rises to 3*VOUT, the voltage at node C1PA rises to the input voltage VIN, and the voltage at node C3PA rises to 2*VOUT. At this point, the controller ends phase 4 and begins phase 1.

[0074] The Dickson-type switched-capacitor converter in this embodiment controls the seventeenth switch QX1A, eighteenth switch QX2A, nineteenth switch QX3A, twentieth switch QX1B, twenty-first switch QX2B, and twenty-second switch QX3B through the two control timing sequences described above. In phase 2, the charge at the first connection point C1NA, node C1PA, node C3PA, fourth connection point C2NB, and node C2PB is transferred through inductor L0 to the third connection point C1NB, node C1PB, node C3PB, second connection point C2NA, and node C2PA, thereby... In the operating state of phase 3, before the second switch Q2A, the fourth switch Q4A, the sixth switch Q6A, the seventh switch Q7A, the ninth switch Q1B, the eleventh switch Q3B, the thirteenth switch Q5B, and the sixteenth switch Q8B are turned on, the voltage differences across the second switch Q2A, the fourth switch Q4A, the sixth switch Q6A, the seventh switch Q7A, the ninth switch Q1B, the eleventh switch Q3B, the thirteenth switch Q5B, and the sixteenth switch Q8B are all zero. In phase 4, the charges at the third connection point C1NB, node C1PB, node C3PB, second connection point C2NA, and node C2PA are all transferred through inductor L0 to the first connection point C1NA, node C1PA, node C3PA, fourth connection point C2NB, and node C2PB. This ensures that in phase 1, before the tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, fifteenth switch Q7B, first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are turned on, the voltage differences across the tenth switch Q2B, twelfth switch Q4B, fourteenth switch Q6B, fifteenth switch Q7B, first switch Q1A, third switch Q3A, fifth switch Q5A, and eighth switch Q8A are all zero. Before the first switch Q1A to the eighth switch Q8A and the ninth switch Q1B to the sixteenth switch Q8B are turned on, the voltage difference across each switch is zero, which reduces the switching losses of the switches and improves the conversion efficiency of the Dickson switched capacitor voltage converter.

[0075] The structure and control method of the switched-capacitor converter in this application are not only applicable to the dual-branch Dickson 4:1 switched-capacitor voltage converter of the above example, but can also be applied to other Dickson switched-capacitor voltage converters, such as... Figure 13 The Dickson-style 5:1 switched capacitor voltage converter shown is illustrated.

[0076] like Figure 13 The diagram shown is a schematic diagram of the circuit structure of a Dickson-type 5:1 switched capacitor voltage converter provided in an embodiment of this application. The Dickson-type 5:1 switched capacitor voltage converter includes an inductor branch, a first branch, and a second branch.

[0077] The first branch includes the first switch Q1A, the second switch Q2A, the third switch Q3A, the fourth switch Q4A, the fifth switch Q5A, the sixth switch Q6A, the seventh switch Q7A, the eighth switch Q8A, the first sub-switch Q9A, the first capacitor CF1A, the second capacitor CF2A, the third capacitor CF3A, and the first sub-capacitor CF4A; the second branch includes the ninth switch Q1B, the tenth switch Q2B, the eleventh switch Q3B, the twelfth switch Q4B, the thirteenth switch Q5B, the fourteenth switch Q6B, the fifteenth switch Q7B, the sixteenth switch Q8B, the second sub-switch Q9B, the fourth capacitor CF1B, the fifth capacitor CF2B, the sixth capacitor CF3B, and the second sub-capacitor CF4B. All switches and sub-switches in both branches are main switches, and each main switch has parasitic capacitance.

[0078] The first terminal of the first switch Q1A and the first terminal of the ninth switch Q1B are the input terminals of a Dickson 5:1 switched-capacitor voltage converter, connected to an external input voltage. The second terminal of the first switch Q1A is connected to the first terminal of the second switch Q2A and the first terminal of the first capacitor CF1A. The second terminal of the ninth switch Q1B is connected to the first terminal of the tenth switch Q2B and the first terminal of the fourth capacitor CF1B. The second terminal of the second switch Q2A is connected to the first terminal of the third switch Q3A and the first terminal of the second capacitor CF2A. The second terminal of the tenth switch Q2B is connected to the first terminal of the eleventh switch Q3B and the first terminal of the fifth capacitor CF2B. The second terminal of the third switch Q3A is connected to the first terminal of the fourth switch Q4A and the first terminal of the third capacitor CF3A. The second terminal of the eleventh switch Q3B is connected to the first terminal of the twelfth switch Q4B and the first terminal of the sixth capacitor CF3A.

[0079] The second terminal of the fourth switch Q4A is connected to the first terminal of the fifth switch Q5A and the first terminal of the first sub-capacitor CF4A. The second terminal of the twelfth switch Q4B is connected to the first terminal of the thirteenth switch Q5B and the first terminal of the second sub-capacitor CF4B. The second terminal of the fifth switch Q5A is connected to the first terminal of the sixth switch Q6A and the first terminal of the eighth switch Q8A. The second terminal of the sixth switch Q6A is connected to the second terminal of the first sub-capacitor CF4A, the second terminal of the second capacitor CF2A, and the first terminal of the seventh switch Q7A. The second terminal of the eighth switch Q8A is connected to the first terminal of the first sub-switch Q9A, the second terminal of the first capacitor CF1A, and the second terminal of the third capacitor CF3A. The second terminals of the seventh switch Q7A and the first sub-switch Q9A are both grounded.

[0080] The second terminal of the thirteenth switch Q5B is connected to the first terminal of the fourteenth switch Q6B and the first terminal of the sixteenth switch Q8B. The second terminal of the fourteenth switch Q6B is connected to the second terminal of the second sub-capacitor CF4B, the second terminal of the fifth capacitor CF2B, and the first terminal of the fifteenth switch Q7B. The second terminal of the sixteenth switch Q8B is connected to the first terminal of the second sub-switch Q9B, the second terminal of the fourth capacitor CF1B, and the second terminal of the sixth capacitor CF3B. The second terminals of the fifteenth switch Q7B and the second terminal of the second sub-switch Q9B are both grounded. The connection point of the second terminal of the fifth switch Q5A, the first terminal of the sixth switch Q6A, the first terminal of the eighth switch Q8A, the second terminal of the thirteenth switch Q5B, the first terminal of the fourteenth switch Q6B, and the first terminal of the sixteenth switch Q8B is the output terminal of the Dickson 5:1 switched capacitor voltage converter.

[0081] The inductor branch includes the seventeenth switch QX1A, the eighteenth switch QX2A, the nineteenth switch QX3A, the twentieth switch QX1B, the twenty-first switch QX2B, the twenty-second switch QX3B, and the inductor L0.

[0082] The connection point of the second terminal of the first capacitor CF1A, the second terminal of the third capacitor CF3A, the second terminal of the eighth switch Q8A, and the first terminal of the first sub-switch Q9A is the first connection point C1NA. The connection point of the second terminal of the second capacitor CF2A, the second terminal of the first sub-capacitor CF4A, the second terminal of the sixth switch Q6A, and the first terminal of the seventh switch Q7A is the second connection point C2NA. The connection point of the second terminal of the fourth capacitor CF1B, the second terminal of the sixth capacitor CF3B, the second terminal of the sixteenth switch Q8B, and the first terminal of the second sub-switch Q9B is the third connection point C1NB. The connection point of the second terminal of the fifth capacitor CF2B, the second terminal of the second sub-capacitor CF4B, the second terminal of the fourteenth switch Q6B, and the first terminal of the fifteenth switch Q7B is the fourth connection point C2NB.

[0083] The first connection point C1NA is connected to node LXA through the seventeenth switch QX1A. The fourth connection point C2NB is connected to node LXA through the nineteenth switch QX3A. Node LXA is connected to GND through the eighteenth switch QX2A. The third connection point C1NB is connected to node LXB through the twentieth switch QX1B. The second connection point C2NA is connected to node LXB through the twenty-second switch QX3B. Node LXB is connected to GND through the twenty-first switch QX2B. Nodes LXA and LXB are connected through inductor L0.

[0084] The type and number of added switching transistors are not limited to the six N-type transistors in the example above; they can also be other numbers of other types of transistors or diodes.

[0085] The control timing is not limited to the two timings mentioned above. Other control timings can also be used to control these switching transistors so that during the time period when the main switching transistor is off, the charge of some branches can be completely transferred to other branches through the inductor, thus achieving the effect of zero-voltage switching and improving the conversion efficiency of the Dickson switched capacitor voltage converter.

[0086] Because the specific implementation of the circuit structure is diverse, the corresponding control methods are also diverse. This application cannot provide examples for each one. Therefore, after those skilled in the art understand the content of this application, they can easily conceive of various modifications, variations or equivalents of the above examples, but they should still be subject to the limitations set forth in the claims and any equivalents.

Claims

1. A Dickson-type switched capacitor voltage converter, comprising an inductor branch and two branches, the two branches including a first branch and a second branch, wherein the input voltage is converted into another voltage output after passing through the two branches; The inductor branch connects the first branch and the second branch. The switching transistors in the first branch and the second branch are the main switching transistors. The inductor branch is used to: after all the main switching transistors are turned off, transfer the charge on the parasitic capacitance of one branch to another branch, and make the voltage difference across the main switching transistors become zero, so that at the moment when each of the main switching transistors is turned on, the voltage difference across each of the main switches is zero. in, The first branch includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a first capacitor, a second capacitor, and a third capacitor; the second branch includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifteenth switch, a sixteenth switch, a fourth capacitor, a fifth capacitor, and a sixth capacitor. The first terminal of the first switch and the first terminal of the ninth switch are the input terminals of the Dickson-type switched capacitor voltage converter. The input terminals are connected to an external input voltage. The second terminal of the first switch is connected to the first terminal of the second switch and the first terminal of the first capacitor. The second terminal of the ninth switch is connected to the first terminal of the tenth switch and the first terminal of the fourth capacitor. The second terminal of the second switch is connected to the first terminal of the third switch and the first terminal of the second capacitor, and the second terminal of the tenth switch is connected to the first terminal of the eleventh switch and the first terminal of the fifth capacitor; The second terminal of the third switch is connected to the first terminal of the fourth switch and the first terminal of the third capacitor, and the second terminal of the eleventh switch is connected to the first terminal of the twelfth switch and the first terminal of the sixth capacitor. The second end of the fourth switch is connected to the first end of the fifth switch and the first end of the seventh switch, and the second end of the twelfth switch is connected to the first end of the thirteenth switch and the first end of the fifteenth switch. The second terminal of the fifth switch is connected to the second terminal of the first capacitor, the second terminal of the third capacitor, and the first terminal of the sixth switch; the second terminal of the seventh switch is connected to the second terminal of the second capacitor and the first terminal of the eighth switch; and the second terminals of the sixth switch and the eighth switch are grounded. The second terminal of the thirteenth switch is connected to the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, and the first terminal of the fourteenth switch; the second terminal of the fifteenth switch is connected to the second terminal of the fifth capacitor and the first terminal of the sixteenth switch; and the second terminals of the fourteenth switch and the sixteenth switch are grounded. The connection point of the second terminal of the fourth switch, the first terminal of the fifth switch, the first terminal of the seventh switch, the second terminal of the twelfth switch, the first terminal of the thirteenth switch, and the first terminal of the fifteenth switch is the output terminal of the Dickson switched capacitor voltage converter. The inductor branch includes the seventeenth switch, the eighteenth switch, the nineteenth switch, the twentieth switch, the twenty-first switch, the twenty-second switch, and an inductor. The connection point of the second terminal of the first capacitor, the second terminal of the third capacitor, the second terminal of the fifth switch, and the first terminal of the sixth switch is the first connection point; the connection point of the second terminal of the second capacitor, the second terminal of the seventh switch, and the first terminal of the eighth switch is the second connection point. The connection point of the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, the second terminal of the thirteenth switch, and the first terminal of the fourteenth switch is the third connection point; the connection point of the second terminal of the fifth capacitor, the second terminal of the fifteenth switch, and the first terminal of the sixteenth switch is the fourth connection point. The first end of the seventeenth switch is connected to the second connection point, and the second end of the seventeenth switch is connected to the first end of the inductor, the first end of the eighteenth switch, and the first end of the nineteenth switch; the second end of the eighteenth switch is grounded, and the second end of the nineteenth switch is connected to the third connection point. The second end of the inductor is connected to the first end of the twentieth switch, the first end of the twentieth switch, and the first end of the twentieth switch. The second end of the twentieth switch is connected to the fourth connection point. The second end of the twentieth switch is grounded, and the second end of the twentieth switch is connected to the first connection point.

2. The Dickson-type switched-capacitor voltage converter according to claim 1, wherein, The first branch includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a first sub-switch, a first capacitor, a second capacitor, a third capacitor, and a first sub-capacitor; the second branch includes a ninth switch, a tenth switch, an eleventh switch, a twelfth switch, a thirteenth switch, a fourteenth switch, a fifteenth switch, a sixteenth switch, a second sub-switch, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a second sub-capacitor. The first terminal of the first switch and the first terminal of the ninth switch are the input terminals of the switched capacitor voltage converter. The input terminals are connected to an external input voltage. The second terminal of the first switch is connected to the first terminal of the second switch and the first terminal of the first capacitor. The second terminal of the ninth switch is connected to the first terminal of the tenth switch and the first terminal of the fourth capacitor. The second terminal of the second switch is connected to the first terminal of the third switch and the first terminal of the second capacitor; the second terminal of the tenth switch is connected to the first terminal of the eleventh switch and the first terminal of the fifth capacitor; the second terminal of the third switch is connected to the first terminal of the fourth switch and the first terminal of the third capacitor; and the second terminal of the eleventh switch is connected to the first terminal of the twelfth switch and the first terminal of the sixth capacitor. The second terminal of the fourth switch is connected to the first terminal of the first sub-capacitor and the first terminal of the fifth switch; the second terminal of the twelfth switch is connected to the first terminal of the second sub-capacitor and the first terminal of the thirteenth switch; the second terminal of the fifth switch is connected to the first terminal of the sixth switch and the first terminal of the eighth switch; the second terminal of the sixth switch is connected to the first terminal of the seventh switch, the second terminal of the first sub-capacitor, and the second terminal of the second capacitor; the second terminal of the eighth switch is connected to the second terminal of the first capacitor, the second terminal of the third capacitor, and the first terminal of the first sub-switch; the second terminals of the seventh switch and the first sub-switch are both grounded. The second terminal of the thirteenth switch is connected to the first terminal of the fourteenth switch and the first terminal of the sixteenth switch. The second terminal of the fourteenth switch is connected to the first terminal of the fifteenth switch, the second terminal of the second sub-capacitor, and the second terminal of the fifth capacitor. The second terminal of the sixteenth switch is connected to the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, and the first terminal of the second sub-switch. The second terminals of the fifteenth switch and the second sub-switch are both grounded. The connection point of the second terminal of the fifth switch, the first terminal of the sixth switch, the first terminal of the eighth switch, the second terminal of the thirteenth switch, the first terminal of the fourteenth switch, and the first terminal of the sixteenth switch is the output terminal of the Dickson switched capacitor voltage converter.

3. The Dickson-type switched-capacitor voltage converter according to claim 2, wherein, The inductor branch includes the seventeenth switch, the eighteenth switch, the nineteenth switch, the twentieth switch, the twenty-first switch, the twenty-second switch, and an inductor; The connection point of the second terminal of the first capacitor, the second terminal of the third capacitor, the second terminal of the eighth switch, and the first terminal of the first sub-switch is the first connection point; the connection point of the second terminal of the second capacitor, the second terminal of the first sub-capacitor, the second terminal of the sixth switch, and the first terminal of the seventh switch is the second connection point; the connection point of the second terminal of the fourth capacitor, the second terminal of the sixth capacitor, the second terminal of the sixteenth switch, and the first terminal of the second sub-switch is the third connection point; and the connection point of the second terminal of the fifth capacitor, the second terminal of the second sub-capacitor, the second terminal of the fourteenth switch, and the first terminal of the fifteenth switch is the fourth connection point. The first end of the seventeenth switch is connected to the first connection point, and the second end of the seventeenth switch is connected to the first end of the inductor, the first end of the eighteenth switch, and the first end of the nineteenth switch; the second end of the eighteenth switch is grounded, and the second end of the nineteenth switch is connected to the fourth connection point. The second end of the inductor is connected to the first end of the twentieth switch, the first end of the twentieth switch, and the first end of the twentieth switch. The second end of the twentieth switch is connected to the third connection point. The second end of the twentieth switch is grounded, and the second end of the twentieth switch is connected to the second connection point.

4. The Dickson-type switched-capacitor voltage converter according to claim 1, wherein, One duty cycle of the Dickson-type switched-capacitor voltage converter includes four phases, namely: First phase: The first, third, fifth, eighth, tenth, twelfth, fourteenth, fifteenth, seventeenth, nineteenth, and twenty-first switches are all turned on, while the other switches are turned off; the input voltage is connected to the output terminal through the first capacitor, the third capacitor is connected in series to the output terminal, and then connected in parallel with the second capacitor, the sixth capacitor is connected in parallel to the output terminal, the fifth capacitor is connected in series to the output terminal, and then connected in parallel with the fourth capacitor; the inductor current is 0; Second phase: The seventeenth, nineteenth, twentieth, and twenty-second switches are all turned on, and the other switches are turned off; the inductor current first increases and then decreases until the inductor current drops to 0, at which point the second phase ends; Third phase: The second, fourth, sixth, seventh, ninth, eleventh, thirteenth, sixteenth, eighteenth, twentieth, and twenty-second switches are all turned on, while the other switches are turned off; the third capacitor is connected in parallel to the output terminal, the second capacitor is connected in series to the output terminal, and then connected in parallel with the first capacitor; the input voltage is connected to the output terminal through the fourth capacitor, the sixth capacitor is connected in series to the output terminal, and then connected in parallel with the fifth capacitor; the inductor current is 0; Fourth phase: The seventeenth, nineteenth, twentieth, and twenty-second switches are all turned on, and the other switches are turned off; the inductor current first increases and then decreases until the inductor current drops to 0, the fourth phase ends, and the first phase begins.

5. The Dickson-type switched-capacitor voltage converter according to claim 1, wherein, One duty cycle of the Dickson-type switched-capacitor voltage converter includes four phases, namely: First phase: The first, third, fifth, eighth, tenth, twelfth, fourteenth, fifteenth, eighteenth, and twenty-first switches are all turned on, while the other switches are turned off; the input voltage is connected to the output terminal through the first capacitor, the third capacitor is connected in series to the output terminal, and then connected in parallel with the second capacitor, the sixth capacitor is connected in parallel to the output terminal, the fifth capacitor is connected in series to the output terminal, and then connected in parallel with the fourth capacitor; the inductor current is 0; Second phase: The seventeenth, nineteenth, twentieth, and twenty-second switches are all turned on, and the other switches are turned off; the inductor current first increases and then decreases until the inductor current drops to 0, at which point the second phase ends; Third phase: The second, fourth, sixth, seventh, ninth, eleventh, thirteenth, sixteenth, eighteenth, and twenty-first switches are all turned on, while the other switches are turned off; the third capacitor is connected in parallel to the output terminal, the second capacitor is connected in series to the output terminal, and then connected in parallel with the first capacitor; the input voltage is connected to the output terminal through the fourth capacitor, the sixth capacitor is connected in series to the output terminal, and then connected in parallel with the fifth capacitor; the inductor current is 0; Fourth phase: The seventeenth, nineteenth, twentieth, and twenty-second switches are all turned on, and the other switches are turned off; the inductor current first increases and then decreases until the inductor current drops to 0, the fourth phase ends, and the first phase begins.

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