CN112994449B - Three-state resonant switch capacitor power converter and control method thereof - Google Patents
Three-state resonant switch capacitor power converter and control method thereof Download PDFInfo
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- CN112994449B CN112994449B CN202110213262.6A CN202110213262A CN112994449B CN 112994449 B CN112994449 B CN 112994449B CN 202110213262 A CN202110213262 A CN 202110213262A CN 112994449 B CN112994449 B CN 112994449B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a tri-state resonant switch capacitor power converter and a control method thereof, wherein the tri-state resonant switch capacitor power converter comprises a first flying capacitor, a second flying capacitor and a voltage output end, wherein the first flying capacitor is connected with a positive voltage end through a first switch tube, and is connected with a voltage grounding end through a second switch tube; the second flying capacitor is connected with the first flying capacitor through a third switching tube and is connected with the first flying capacitor through a fourth switching tube, and the second flying capacitor is connected with a voltage grounding end through a fifth switching tube; the voltage output end is connected with the second flying capacitor through a sixth switching tube and connected with the second flying capacitor through a seventh switching tube, and the voltage output end is connected with a voltage grounding end; and the output current loop between the second flying capacitor and the voltage output end is also connected with a resonant inductor in series. Under the same working condition, fewer switching tubes, flying capacitors and resonant inductors are required, so that the size of the converter is reduced, the loss is reduced, and the power efficiency and the power density are improved.
Description
Technical Field
The invention relates to the technical field of electric energy conversion, in particular to a three-state resonant switch capacitor power converter and a control method thereof.
Background
In the field of power conversion technology, DC-DC converters include inductive DC-DC converters, hybrid DC-DC converters, and switched capacitor DC-DC converters. However, the conventional inductive DC-DC converter requires the switching tube to have a high voltage withstanding capability, thereby causing reliability problems, increasing the cost and power consumption of the converter; the hybrid DC-DC converter adopting the switch capacitor to reduce the voltage drop of the switch node realizes small ripples through a large inductor, but can limit the power density; the switch capacitor DC-DC converter formed by pure switch capacitors can solve the problems of power density and voltage endurance, but has a large peak current, which results in an increase in power consumption and current endurance.
Therefore, in order to meet the development trend of high efficiency and high power of the switching power supply, the resonant converter becomes a hot point of research in the technical field of electric energy conversion by virtue of the soft switching characteristic of the resonant converter. However, most of the current resonant converters are made based on isolated transformers, which generally limit the power density of the converter. Although some non-isolated resonant converters exist, most of the non-isolated resonant converters work in a two-phase 4 state, and a resonant converter formed by two flying capacitors can only reach 2: 1 or 3: 1, in the conversion ratio. For a required conversion ratio of 4: 1, such as data center power supply, robot, drone or handheld electronic device power supply, etc., the existing non-isolated converter requires at least eight power tubes, at least two flying capacitors and at least one resonant inductor, resulting in a limited power density of the converter.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a tri-state resonant switched capacitor power converter which can reduce the number of switching tubes, thereby reducing the size of the converter, reducing the loss and improving the power efficiency and the power density.
The invention also provides a control method of the tri-state resonant switch capacitor power converter.
In a first aspect, a tri-state resonant switched capacitor power converter according to an embodiment of the present invention includes a first flying capacitor, a first end of the first flying capacitor is connected to a first switching tube and connected to a positive voltage terminal through the first switching tube, and a second end of the first flying capacitor is connected to a second switching tube and connected to a voltage ground terminal through the second switching tube; the first end of the second flying capacitor is connected with a third switching tube and a fourth switching tube, and is connected with the first end of the first flying capacitor through the third switching tube and is connected with the second end of the first flying capacitor through the fourth switching tube, and the second end of the second flying capacitor is connected with a fifth switching tube and is connected with the voltage grounding end through the fifth switching tube; the voltage output end is connected with a sixth switching tube and a seventh switching tube, connected with the first end of the second flying capacitor through the sixth switching tube and connected with the second end of the second flying capacitor through the seventh switching tube; and the output current loop between the second flying capacitor and the voltage output end is also connected with a resonant inductor in series.
The tri-state resonant switched capacitor power converter according to the embodiment of the invention has at least the following beneficial effects: the resonant circuit formed by the inductor and the capacitor can realize energy exchange and use, the topological structure of the resonant converter only needs seven switching tubes, the circuit topology is simple, and compared with the existing resonant converter, the resonant converter needs fewer switching tubes, flying capacitors and resonant inductors under the same working condition, so that the size of the converter is favorably reduced, the loss is reduced, and the power efficiency and the power density are improved.
According to some embodiments of the invention, the tri-state resonant switched capacitor power converter further comprises an output capacitor, a first terminal of the output capacitor is connected to the voltage output terminal, and a second terminal of the output capacitor is connected to the voltage ground terminal.
According to some embodiments of the present invention, a first end of the resonant inductor is connected to the sixth switching tube and the seventh switching tube, respectively, and is connected to the first end of the second flying capacitor through the sixth switching tube, and is connected to the second end of the second flying capacitor through the seventh switching tube, and the second end of the resonant inductor is connected to the first end of the voltage output end.
According to some embodiments of the present invention, a first end of the resonant inductor is connected to a second end of the second flying capacitor, and a second end of the resonant inductor is connected to the fifth switching tube and the seventh switching tube, respectively, and is connected to the voltage ground terminal through the fifth switching tube, and is connected to the first end of the output capacitor through the seventh switching tube.
According to some embodiments of the present invention, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube adopt discrete or integrated power semiconductor devices.
According to some embodiments of the present invention, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube adopt MOSFET, IGBT or gan fet.
According to some embodiments of the invention, the tri-state resonant switched capacitor power converter further comprises an input power supply, the positive pole of the input power supply being the positive voltage terminal and the negative pole of the input power supply being the voltage ground terminal.
According to some embodiments of the invention, the input power source employs a battery, a fuel cell or a photovoltaic cell.
According to some embodiments of the invention, the first flying capacitor, the second flying capacitor and the output capacitor employ discrete or integrated capacitive elements.
In a second aspect, a method for controlling a three-state resonant switched capacitor power converter according to an embodiment of the present invention is based on the three-state resonant switched capacitor power converter of the first aspect, where the three-state resonant switched capacitor power converter is configured with three working phases, and includes:
in a first phase, the first switch tube, the fourth switch tube and the seventh switch tube are all turned on, the rest switch tubes are all turned off, and the first flying capacitor, the second flying capacitor and the output capacitor are in a charging state;
in a second phase, the second switching tube, the third switching tube and the seventh switching tube are all switched on, the rest switching tubes are all switched off, the first flying capacitor is in a discharging state, and the second flying capacitor and the output capacitor are all in a charging state;
in a third phase, the second switching tube, the fifth switching tube and the sixth switching tube are all turned on, the rest switching tubes are all turned off, the second flying capacitor is in a discharging state, and the output capacitor is in a charging state.
The control method of the tri-state resonant switch capacitor power converter according to the embodiment of the invention at least has the following beneficial effects: the resonant circuit formed by the inductor and the capacitor and the on-off states of the first to seventh switching tubes in different phases can realize energy exchange, the topological structure of the resonant converter only needs seven switching tubes, the circuit topology is simple, and compared with the existing resonant converter, the resonant converter has fewer switching tubes, flying capacitors and resonant inductors under the same working condition, so that the size of the converter is favorably reduced, the loss is reduced, and the power efficiency and the power density are improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is one of the topology diagrams of a three-state resonant switched-capacitor power converter according to an embodiment of the present invention;
FIG. 2 is a second topology diagram of a three-state resonant switched capacitor power converter according to an embodiment of the present invention;
fig. 3a, 3b, 3c are simplified circuit diagrams of the three-state resonant switched capacitor power converter shown in fig. 1 in a first phase, a second phase and a third phase, respectively;
fig. 4a, 4b, 4c are simplified circuit diagrams of the three-state resonant switched capacitor power converter shown in fig. 2 in a first phase, a second phase and a third phase, respectively;
FIG. 5 is a partial waveform diagram of a three state resonant switched capacitor power converter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. Unless otherwise indicated, the descriptions of "first", "second", and the like are only used for distinguishing technical features, and are not understood to indicate or imply relative importance or to implicitly indicate the number of indicated technical features or to implicitly indicate precedence of indicated technical features.
In the description of the present invention, unless otherwise specifically limited, terms such as connection, series connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.
The embodiment discloses a tri-state resonant switched capacitor power converter, which comprises a first flying capacitor, a second flying capacitor and a voltage output end, wherein a first end of the first flying capacitor is connected with a first switching tube and is connected with a positive voltage end through the first switching tube; the first end of the voltage output end is connected with a sixth switching tube and a seventh switching tube, and is connected with the first end of the second flying capacitor through the sixth switching tube, and is connected with the second end of the second flying capacitor through the seventh switching tube, the second end of the voltage output end is connected with a voltage grounding end, and a resonant inductor is further connected in series on an output current loop between the second flying capacitor and the voltage output end.
The resonant circuit formed by the inductor and the capacitor can realize energy exchange and use, the topological structure of the resonant circuit only needs seven switching tubes, the circuit topology is simple, and compared with the existing resonant converter, the resonant converter has fewer switching tubes, flying capacitors and resonant inductors under the same working condition, so that the size of the converter is favorably reduced, the loss is reduced, and the power efficiency and the power density are improved. It should be noted that, when in use, the voltage output terminal is connected with an output capacitor, and it should be understood that the output capacitor may be embedded in the tri-state resonant switched capacitor power converter or externally embedded in the post-stage circuit. When the output capacitor is arranged in the tri-state resonant switch capacitor power converter, the tri-state resonant switch capacitor power converter further comprises the output capacitor, the first end of the output capacitor is connected with the voltage output end, and the second end of the output capacitor is connected with the voltage grounding end.
To further understand the topology of the tri-state resonant switched capacitor power converter of the present embodiment, a detailed description is provided below with reference to two topology examples of fig. 1 and 2.
Example 1
Referring to fig. 1, the first flying capacitor, the second flying capacitor and the output capacitor correspond to the capacitor C1, the capacitor C2 and the capacitor C, respectively OUT The first to seventh switching tubes correspond to the switches S1-S7, respectively, and the resonant inductor corresponds to the inductor L R . In this embodiment, the first end of the resonant inductor is connected to the sixth switching tube and the seventh switching tube, respectively, and is connected to the first end of the second flying capacitor through the sixth switching tube, and is connected to the second end of the second flying capacitor through the seventh switching tube, and the second end of the resonant inductor is connected to the first end of the output capacitor.
The tri-state resonant switched capacitor power converter of the embodiment has three working phases during working, corresponding switching tubes are controlled to be switched on or switched off under the three working phases respectively, and different resonant loops can be formed by using the inductor and the capacitor so as to realize energy exchange and use.
Referring to fig. 1, 3a, 3b, 3c and 5, fig. 3a, 3b and 3c respectively show three-state resonanceSimplified circuit of a switched capacitor power converter in a first phase, a second phase and a third phase, fig. 5 shows a waveform diagram of a three-state resonant switched capacitor power converter, where I OUT The value of the current flowing through the output capacitor, V CF1 Is the voltage value, V, across the first flying capacitor CF2 Is the voltage value, phi, across the second flying capacitor 1 、φ 2 And phi 3 Indicating that the converter is in a first phase, a second phase and a third phase, respectively.
Referring to fig. 3a and 5, in the first phase, the first switch tube, the fourth switch tube and the seventh switch tube are all turned on, the remaining switch tubes are all turned off, and the first flying capacitor, the second flying capacitor and the resonant inductor are connected in series to the input voltage V IN And an output voltage V OUT Between, input voltage V IN And charging the first flying capacitor, the second flying capacitor and the output capacitor, namely, the first flying capacitor, the second flying capacitor and the output capacitor are in a charging state.
Referring to fig. 3b and fig. 5, in the second phase, the second switch tube, the third switch tube and the seventh switch tube are turned on, the remaining switch tubes are all turned off, and the second flying capacitor and the resonant inductor are connected in series to the first flying capacitor and the output voltage V OUT At the moment, the first flying capacitor is in a discharging state, and the second flying capacitor and the output capacitor are both in a charging state, so that the first flying capacitor charges the second flying capacitor and the output capacitor.
Referring to fig. 3c and 5, in the third phase, the second switch tube, the fifth switch tube and the sixth switch tube are turned on, the remaining switch tubes are all turned off, and the second flying capacitor is connected in series to the resonant inductor and the output voltage V OUT Meanwhile, the second end of the first flying capacitor is grounded, the first end of the first flying capacitor is open-circuit, the second flying capacitor is in a discharging state, and the output capacitor is in a charging state, so that the second flying capacitor is charged to the output capacitor.
Because the resonant inductor is always connected in series on the current output loop between the second flying capacitor and the output capacitor, the time length of the first phase, the second phase and the third phase can be controlled by adjusting the inductance value of the resonant inductor, so that the resonant current I OUT Voltage value V CF1 And voltageValue V CF2 The waveform of (2) is shown in fig. 5.
Example 2
Referring to fig. 2, the first flying capacitor, the second flying capacitor and the output capacitor correspond to the capacitor C1, the capacitor C2 and the capacitor C, respectively OUT The first to seventh switch tubes correspond to the switches S1-S7, respectively, and the resonant inductor corresponds to the inductor L R . The difference from embodiment 1 is that in this embodiment, the first end of the resonant inductor is connected to the second end of the second flying capacitor, and the second end of the resonant inductor is connected to the fifth switching tube and the seventh switching tube, respectively, and is connected to the voltage ground through the fifth switching tube, and is connected to the first end of the output capacitor through the seventh switching tube.
As in embodiment 1, the three-state resonant switched capacitor power converter of this embodiment also has three operating phases during operation, and the switching states of the first to seventh switching transistors in the three operating phases are the same as those in embodiment 1, that is:
referring to fig. 1, fig. 4a, fig. 4b, fig. 4c and fig. 5, fig. 4a, fig. 4b and fig. 4c show simplified circuits of the three-state resonant switched-capacitor power converter in the first phase, the second phase and the third phase, respectively, and fig. 5 shows waveform diagrams of the three-state resonant switched-capacitor power converter.
Referring to fig. 4a and 5, in the first phase, the first switch tube, the fourth switch tube and the seventh switch tube are all turned on, the remaining switch tubes are all turned off, and the first flying capacitor, the second flying capacitor and the resonant inductor are connected in series to the input voltage V IN And an output voltage V OUT Between, the input voltage V IN And charging the first flying capacitor, the second flying capacitor and the output capacitor, namely, the first flying capacitor, the second flying capacitor and the output capacitor are in a charging state.
Referring to fig. 4b and fig. 5, in the second phase, the second switch tube, the third switch tube and the seventh switch tube are turned on, the remaining switch tubes are all turned off, and the second flying capacitor and the resonant inductor are connected in series to the first flying capacitor and the output voltage V OUT At the moment, the first flying capacitor is in a discharging state, and the second flying capacitor and the output capacitor are both in a charging state, so that the first flying capacitor is in charge of the second flying capacitorThe output capacitor is charged.
Referring to fig. 4c and 5, in the third phase, the second switch tube, the fifth switch tube and the sixth switch tube are turned on, the remaining switch tubes are all turned off, and the second flying capacitor is connected in series to the resonant inductor and the output voltage V OUT Meanwhile, the second end of the first flying capacitor is grounded, the first end of the first flying capacitor is open-circuited, the second flying capacitor is in a discharging state, and the output capacitor is in a charging state, so that the second flying capacitor charges the output capacitor.
Because the resonant inductor is always connected in series on the current output loop between the second flying capacitor and the output capacitor, the time length of the first phase, the second phase and the third phase can be controlled by adjusting the inductance value of the resonant inductor, so that the resonant current I OUT Voltage value V CF1 Sum voltage value V CF2 The waveform of (2) is shown in fig. 5.
In the above embodiments, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube adopt discrete or integrated power semiconductor devices. For example, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube and the seventh switch tube adopt MOSFET, IGBT or GaNFET. It is understood that the first to seventh switching tubes may employ the same type of semiconductor device, for example, only MOSFETs, or only IGBTs; the first to seventh switching tubes may also adopt different types of semiconductor devices, for example, the first switching tube adopts a MOSFET, and the second switching tube adopts an IGBT.
In practical applications, the positive voltage terminal and the voltage ground terminal in the tri-state resonant switched capacitor power converter can be provided by different power sources. For example, in some embodiments, the tri-state resonant switched capacitor power converter further includes an input power supply, the positive electrode of the input power supply is a positive voltage terminal, the negative electrode of the input power supply is a voltage ground terminal, the input power supply is a storage battery, a fuel cell or a photovoltaic cell, and the input power supply can be supplied by a compatible battery, which is beneficial to providing the application of the tri-state resonant switched capacitor power converter in the scenarios of data center power supply, robot, unmanned aerial vehicle, handheld electronic device power supply, and the like. For example, in some embodiments, the tri-state resonant switched capacitor power converter is powered by a voltage converting circuit in a previous stage, and both the positive voltage terminal and the voltage ground terminal are interfaces adapted to the output terminal of the voltage converting circuit.
The above embodiments show topologies of tri-state resonant switched capacitor power converters in which the first flying capacitor, the second flying capacitor, and the output capacitor employ separate capacitive elements, which is beneficial to reducing the number of capacitive elements. It is appreciated that the first flying capacitor, the second flying capacitor and the output capacitor may also employ integrated capacitive elements, and the capacitive elements may be individually integrated capacitive elements or a stack of multiple integrated capacitive elements.
The embodiment of the present invention further discloses a control method for a three-state resonant switched capacitor power converter, based on the third three-state resonant switched capacitor power converter, the three-state resonant switched capacitor power converter is configured with three working phases, including:
in the first phase, the first switch tube, the fourth switch tube and the seventh switch tube are all switched on, the rest switch tubes are all switched off, and the first flying capacitor, the second flying capacitor and the output capacitor are in a charging state;
in the second phase, the second switching tube, the third switching tube and the seventh switching tube are all switched on, the rest switching tubes are all switched off, the first flying capacitor is in a discharging state, and the second flying capacitor and the output capacitor are all in a charging state;
in the third phase, the second switch tube, the fifth switch tube and the sixth switch tube are all switched on, the rest switch tubes are all switched off, the second flying capacitor is in a discharging state, and the output capacitor is in a charging state.
The resonant circuit formed by the inductor and the capacitor and the on-off states of the first to seventh switching tubes in different phases can realize energy exchange, the topological structure of the resonant converter only needs seven switching tubes, the circuit topology is simple, and compared with the existing resonant converter, the resonant converter has fewer switching tubes, flying capacitors and resonant inductors under the same working condition, so that the size of the converter is favorably reduced, the loss is reduced, and the power efficiency and the power density are improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A three-state resonant switched capacitor power converter, comprising:
the first end of the first flying capacitor is connected with a first switching tube and is connected with a positive voltage end through the first switching tube, and the second end of the first flying capacitor is connected with a second switching tube and is connected with a voltage grounding end through the second switching tube;
the first end of the second flying capacitor is connected with a third switching tube and a fourth switching tube, and is connected with the first end of the first flying capacitor through the third switching tube and is connected with the second end of the first flying capacitor through the fourth switching tube, and the second end of the second flying capacitor is connected with a fifth switching tube and is connected with the voltage grounding end through the fifth switching tube;
the voltage output end is connected with a sixth switching tube and a seventh switching tube, connected with the first end of the second flying capacitor through the sixth switching tube and connected with the second end of the second flying capacitor through the seventh switching tube;
the output current loop between the second flying capacitor and the voltage output end is also connected with a resonant inductor in series;
when the first switch tube, the fourth switch tube and the seventh switch tube are all switched on, the rest switch tubes are all switched off;
when the second switching tube, the third switching tube and the seventh switching tube are all switched on, the rest switching tubes are all switched off;
when the second switch tube, the fifth switch tube and the sixth switch tube are all switched on, the rest switch tubes are all switched off.
2. The tri-state resonant switched capacitor power converter of claim 1 further comprising an output capacitor, a first terminal of the output capacitor being connected to the voltage output terminal and a second terminal of the output capacitor being connected to the voltage ground terminal.
3. The tri-state resonant switched-capacitor power converter as claimed in claim 2, wherein the first terminal of the resonant inductor is connected to the sixth switching transistor and the seventh switching transistor, respectively, and to the first terminal of the second flying capacitor through the sixth switching transistor, and to the second terminal of the second flying capacitor through the seventh switching transistor, and the second terminal of the resonant inductor is connected to the first terminal of the voltage output terminal.
4. The tri-state resonant switched capacitor power converter of claim 2, wherein a first terminal of the resonant inductor is connected to a second terminal of the second flying capacitor, and a second terminal of the resonant inductor is connected to the fifth switching transistor and the seventh switching transistor, respectively, and is connected to the voltage ground terminal through the fifth switching transistor, and is connected to the first terminal of the output capacitor through the seventh switching transistor.
5. The tri-state resonant switched capacitor power converter of claim 2, wherein the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor, the sixth switch transistor, and the seventh switch transistor are discrete or integrated power semiconductor devices.
6. The tri-state resonant switched capacitor power converter of claim 5, wherein the first, second, third, fourth, fifth, sixth and seventh switching transistors are MOSFETs, IGBTs or GaNFETs.
7. The tri-state resonant switched capacitor power converter of claim 2, further comprising an input power supply, wherein the positive pole of the input power supply is the positive voltage terminal and the negative pole of the input power supply is the voltage ground terminal.
8. The tri-state resonant switched capacitor power converter of claim 7, wherein the input power source is a battery, a fuel cell, or a photovoltaic cell.
9. The tri-state resonant switched capacitor power converter of claim 2, wherein the first flying capacitor, the second flying capacitor and the output capacitor employ discrete or integrated capacitive elements.
10. A method of controlling a three-state resonant switched-capacitor power converter, based on the three-state resonant switched-capacitor power converter of any of claims 2 to 8, wherein the three-state resonant switched-capacitor power converter is configured with three operating phases, comprising:
in a first phase, the first switch tube, the fourth switch tube and the seventh switch tube are all turned on, the rest switch tubes are all turned off, and the first flying capacitor, the second flying capacitor and the output capacitor are in a charging state;
in a second phase, the second switching tube, the third switching tube and the seventh switching tube are all switched on, the rest switching tubes are all switched off, the first flying capacitor is in a discharging state, and the second flying capacitor and the output capacitor are all in a charging state;
in a third phase, the second switching tube, the fifth switching tube and the sixth switching tube are all turned on, the rest switching tubes are all turned off, the second flying capacitor is in a discharging state, and the output capacitor is in a charging state.
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