CN116260331A - Multi-resonant switched capacitor converter - Google Patents
Multi-resonant switched capacitor converter Download PDFInfo
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- CN116260331A CN116260331A CN202111502582.XA CN202111502582A CN116260331A CN 116260331 A CN116260331 A CN 116260331A CN 202111502582 A CN202111502582 A CN 202111502582A CN 116260331 A CN116260331 A CN 116260331A
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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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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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
There is provided a multi-resonant switched-capacitor converter having an input terminal and an output terminal for converting an input voltage at the input terminal to an output voltage at the output terminal, the multi-resonant switched-capacitor converter comprising: a power switching element connected to the input terminal; a non-resonant capacitive element coupled to the output terminal; and one or more resonant modules connected to the power switching element and the non-resonant capacitive element, the resonant modules including a resonant network, a first switching element group configured to connect the resonant network in series with the non-resonant capacitive element, and a second switching element group configured to connect the resonant network in parallel with the non-resonant capacitive element for the same resonant module. Accordingly, the series-parallel connection of the capacitor elements can realize not only the even-ratio voltage reduction ratio but also the odd-ratio voltage reduction ratio.
Description
Technical Field
The invention relates to a multi-resonant switched capacitor converter.
Background
Conventionally, in order to realize conversion of electric power at an input voltage into electric power at a desired output voltage, a resonant switched capacitor converter having a multi-resonant frequency, that is, a multi-resonant switched capacitor converter (Multi Resonant Switched-Capacitor Converters, abbreviated as mrcc), is known for a high-density and high-efficiency non-isolated DC/DC converter.
Fig. 6 is a schematic diagram showing the topology of a prior art multi-resonant switched capacitor converter, wherein (a) is a schematic diagram showing the topology with a step-down ratio of 2:1 and (b) is a schematic diagram showing the topology with a step-down ratio of 4:1. As shown in fig. 6 (a), the basic topology of the conventional multi-resonant switched capacitor converter includes four switching transistors S1, S2, D1, D2 and an LC resonant circuit composed of a capacitor Cr and an inductor Lr, whereby a voltage reduction ratio of 2:1 can be achieved by capacitive voltage division. As shown in fig. 6 (b), a step-down ratio of 4:1 can be achieved by including two sets of basic topologies, one set including S1, S2, D1, D2 and an LC resonance circuit composed of a capacitor Cr and an inductor Lr, and the other set including S3, S4, D5, D6 and an LC resonance circuit composed of a capacitor cr_2 and an inductor lr_2, and a capacitor C2 and switching transistors D3, D4 being provided between the two sets of basic topologies. In existing multi-resonant switched capacitor converters, 2:1, 4:1, 6 can be achieved by including one or more sets of basic topologies: 1. a pressure reduction ratio of 8:1, etc.
However, with existing multi-resonant switched capacitor converters, the buck topology can only achieve even ratio buck ratios and cannot achieve odd ratios such as 5:1. Further, the capacitor C2 needs to have a capacitance value much larger than that of the capacitor C1 and the capacitor C3, so that it is inconvenient to select the model of the capacitor C2, and since the large capacitance of the capacitor C2 needs a large size, this causes limitation of layout and wiring.
Prior art literature
Patent literature
Patent document 1: US10658928B2
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a multi-resonant switched capacitor converter capable of realizing not only a voltage reduction ratio of an even ratio but also a voltage reduction ratio of an odd ratio by series-parallel connection of capacitive elements.
In order to solve the above-described problems, a multi-resonant switched capacitor converter according to the present invention includes an input terminal and an output terminal for converting an input voltage at the input terminal into an output voltage at the output terminal, and includes: a power switching element connected to the input terminal; a non-resonant capacitive element coupled to the output terminal; and one or more resonant modules connected to the power switching element and the non-resonant capacitive element, the resonant modules including a resonant network, a first switching element group configured to connect the resonant network in series with the non-resonant capacitive element, and a second switching element group configured to connect the resonant network in parallel with the non-resonant capacitive element for the same resonant module.
Furthermore, according to the multi-resonant switched capacitor converter of the present invention, it is preferable that the resonant network comprises a resonant capacitive element and a resonant inductive element connected in series, the first switching element group comprises a second switching element, the second switching element group comprises a first switching element and a third switching element, the first switching element is connected to the capacitive output of the resonant network, the second switching element is connected to the first switching element and the inductive output of the resonant network, and the third switching element is connected to the second switching element and to ground.
Further, according to the multi-resonant switched capacitor converter of the present invention, it is preferable that during the first period, the power switching element and the first switching element group of each of the resonant modules are turned on, and the second switching element group of each of the resonant modules is turned off, whereby the resonant networks of each of the resonant modules are connected in series with the non-resonant capacitive elements, and during the second period, the power switching element and the first switching element group of each of the resonant modules are turned off, and the second switching element group of each of the resonant modules is turned on, whereby the resonant networks of each of the resonant modules are connected in parallel with the non-resonant capacitive elements.
Further, according to the multi-resonant switched capacitor converter of the present invention, it is preferable that in the case where a plurality of resonant modules are included, the capacitance values of the resonant capacitive elements included in the respective resonant networks of the resonant modules are equal.
Furthermore, the multi-resonant switched capacitor converter according to the invention preferably comprises a plurality of resonant modules, the resonant frequencies of the respective resonant networks of which are equal.
Furthermore, according to the multi-resonant switched capacitor converter of the present invention, it is preferable that the operating frequencies of the respective first, second and third switching elements of the resonant module are equal to the resonant frequency.
Furthermore, according to the multi-resonant switched capacitor converter of the present invention, it is preferable that the power switching element and the first switching element, the second switching element, and the third switching element of each of the resonant modules are each constituted by an NMOS transistor.
Furthermore, according to the multi-resonant switched capacitor converter of the present invention, preferably, for the same resonant module, the drain of the first switching element is connected to the capacitive output of the resonant network, the drain of the second switching element is connected to the source of the first switching element, the source of the second switching element is connected to the inductive output of the resonant network, the drain of the third switching element is connected to the source of the second switching element, and the source of the third switching element is connected to ground.
Furthermore, according to the multi-resonant switched capacitor converter of the present invention, it is preferable that the control signals are inputted to the respective first, second and third switching elements of the resonant module through the driver such that the operating frequencies of the respective first, second and third switching elements of the resonant module are equal to the resonant frequencies of the respective resonant network of the resonant module.
Effects of the invention
According to the multi-resonant switched capacitor converter of the present invention, the series-parallel connection of the resonant network and the non-resonant capacitive element provided in one or more resonant modules is switched by a simple topology, so that the series-parallel connection of the capacitive elements can realize not only a voltage reduction ratio of an even ratio but also a voltage reduction ratio of an odd ratio.
In addition, according to the multi-resonant switched capacitor converter, the equivalent circuit of the topological structure is relatively simple, and the topology can be easily carried out.
Drawings
Fig. 1 is a schematic diagram showing the topology of a multi-resonant switched-capacitor converter according to an embodiment of the present invention.
Fig. 2 is a schematic diagram showing a series operation state of a multi-resonant switched-capacitor converter according to an embodiment of the present invention.
Fig. 3 is a schematic diagram showing a parallel operation state of a multi-resonant switched-capacitor converter according to an embodiment of the present invention.
Fig. 4 is a diagram showing an example of timing control of the multi-resonant switched capacitor converter according to the embodiment of the present invention.
Fig. 5 is a diagram showing simulation results of a multi-resonant switched capacitor converter according to an embodiment of the present invention.
Fig. 6 is a schematic diagram showing the topology of a prior art multi-resonant switched capacitor converter, wherein (a) is a schematic diagram showing the topology with a step-down ratio of 2:1 and (b) is a schematic diagram showing the topology with a step-down ratio of 4:1.
Detailed Description
The present application is described in further detail below with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
Fig. 1 is a schematic diagram showing the topology of a multi-resonant switched-capacitor converter according to an embodiment of the present invention. In the schematic diagram of fig. 1, a situation is shown in which a 5:1 pressure reduction ratio can be achieved.
As shown in fig. 1, the multi-resonant switched capacitor converter has an input terminal and an output terminal for converting an input voltage Vin on the input terminal to an output voltage Vo on the output terminal. The multi-resonant switched capacitor converter of the present embodiment includes a power switching element Q1 connected to an input terminal, a non-resonant capacitor element Co coupled to an output terminal, and 4 resonant modules connected to the power switching element Q1 and the non-resonant capacitor element Co. In the schematic diagram of fig. 1, the first resonance module from the left includes a resonance network, a switching element Q2 (an example of a first switching element), a switching element Q6 (an example of a second switching element), and a switching element Q7 (an example of a third switching element). In the first resonance module from the left, the resonance network includes a resonance capacitive element C1 and a resonance inductive element L1 connected in series, a switching element Q2 is connected to a capacitive output of the resonance network, a switching element Q6 is connected to the switching element Q2 and an inductive output of the resonance network, and a switching element Q7 is connected to the switching element Q6 and to ground. The second resonance module from the left side includes a resonance network including a resonance capacitance element C2 and a resonance inductance element L2, a switching element Q3, a switching element Q8, and a switching element Q9. The third resonance module from the left side includes a resonance network including a resonance capacitance element C3 and a resonance inductance element L3, a switching element Q4, a switching element Q10, and a switching element Q11. The fourth resonance module from the left side includes a resonance network including a resonance capacitance element C4 and a resonance inductance element L4, a switching element Q5, a switching element Q12, and a switching element Q13. The connection relation between the second resonance module and the fourth resonance module from the left side is the same as that of the first resonance module from the left side, and the description thereof is omitted. Note that, the load Ro connected in parallel with the non-resonant capacitive element Co has no influence on the topology of the multi-resonant switched capacitor converter of the present invention, and therefore, the description thereof is omitted.
In the present embodiment, as shown in fig. 1, for example, in the first resonance module from the left side, the switching element Q2 and the switching element Q7 are configured to connect the resonance network in the resonance module in parallel with the non-resonance capacitive element Co, and the switching element Q6 is configured to connect the resonance network in the resonance module in series with the non-resonance capacitive element Co. The same is true in other resonant modules. Therefore, it can be said that in the first resonance module from the left side, the switching element Q2 and the switching element Q7 are configured to connect the resonance network in the resonance module in parallel with the resonance network in the other resonance module, and the switching element Q6 is configured to connect the resonance network in the resonance module in series with the resonance network in the other resonance module.
In the present embodiment, the case shown in fig. 1 is only one example, and the number of switching elements included in each resonance module is not particularly limited as long as two switching element groups, i.e., a first switching element group and a second switching element group are included, the first switching element group being configured to connect the resonance network in series with the non-resonance capacitive element and the second switching element group being configured to connect the resonance network in parallel with the non-resonance capacitive element for the same resonance module. In the example of fig. 1, the first switching element group includes a switching element Q6, and the second switching element group includes a switching element Q2 and a switching element Q7.
In the present embodiment, for the timing control, the switching elements are divided into two groups, the first group of switching elements is the switching element Q1, the switching element Q6, the switching element Q8, the switching element Q10, and the switching element Q12, the second group of switching elements is the switching element Q2, the switching element Q3, the switching element Q4, the switching element Q5, the switching element Q7, the switching element Q9, the switching element Q11, and the switching element Q13, and during the first period, the first group of switching elements is turned on, and the second group of switching elements is turned off, so that the resonant network of each of the resonant modules is connected in series with the non-resonant capacitor element Co.
Fig. 2 is a schematic diagram showing a series operation state of a multi-resonant switched-capacitor converter according to an embodiment of the present invention. During the first period, the first group of switching elements is turned on and the second group of switching elements is turned off, so that 4 resonant networks are connected in series between Vin and Vo as shown in fig. 2, and at this time, the voltages of the respective resonant networks are V1, V2, V3, and V4 by capacitive voltage division.
During the second period, the first group of switching elements is turned off and the second group of switching elements is turned on, so that the resonant network of each resonant module is connected in parallel with the non-resonant capacitive element Co.
Fig. 3 is a schematic diagram showing a parallel operation state of a multi-resonant switched-capacitor converter according to an embodiment of the present invention. During the second period, the first group of switching elements is turned off and the second group of switching elements is turned on, so that 4 resonant networks are connected in parallel with the non-resonant capacitive element Co, respectively, as shown in fig. 3, and the voltage of each resonant network is equal to Vo.
Here, by equalizing the capacitance values of the resonance capacitive elements included in the respective resonance networks of each resonance module, that is, by making c1=c2=c3=c4, the capacitive partial pressure can be simply controlled. And by equalizing the inductance values of the resonant inductance elements included in the respective resonant networks of each resonant module, that is, l1=l2=l3=l4, the resonant frequencies of the respective resonant networks of each resonant module can be easily equalized, that is, fr1=fr2=fr3=fr4. In this case, the following expression is satisfied.
V1+V2+V3+V4＝Vin-Vo
V1＝V2＝V3＝V4＝Vo
From this, vin=5 Vo can be derived, that is, a 5:1 step-down ratio can be achieved.
Fig. 4 is a diagram showing an example of timing control of the multi-resonant switched capacitor converter according to the embodiment of the present invention. Where Gate1 shows the period of the first period, gate2 shows the period of the second period, and L2 current shows the current of each resonant network.
Fig. 5 is a diagram showing simulation results of a multi-resonant switched capacitor converter according to an embodiment of the present invention. In one example of the present embodiment, the input voltage vin=55v is set, the inductance value l=0.1 uH of the resonant inductance element of each resonant network is set, the capacitance value c=2.46 uH of the resonant capacitance element of each resonant network is set, and the resonant frequency of each resonant network is set
The simulation results in an output voltage vo=11v, with a standard sine wave for the tank current.
In the present embodiment, the basic topology unit of the multi-resonant switched capacitor converter is configured to include the resonant network, the first switching element group configured to connect the resonant network in series with the non-resonant capacitive element, and the second switching element group configured to connect the resonant network in parallel with the non-resonant capacitive element, so that the equivalent circuit of the topology is relatively simple, and the topology can be easily performed. For example, as in the first resonance module from the left side in fig. 1, the resonance network includes a resonance capacitor element C1 and a resonance inductor element L1 connected in series, the first switching element group includes a switching element Q6, the second switching element group includes a switching element Q2 and a switching element Q7, the switching element Q2 is connected to a capacitance output terminal of the resonance network, the switching element Q6 is connected to the switching element Q2 and an inductance output terminal of the resonance network, and the switching element Q7 is connected to the switching element Q6 and ground.
That is, although 5 is implemented in this embodiment: 1, but the invention is not limited to this, and can be conveniently extended by using a basic topological structure unit according to the required pressure reduction ratio. For example, in the case where only one resonance module is included in the multi-resonance switched capacitor converter of the present invention, a voltage reduction ratio of 2:1 can be achieved, in the case where two resonance modules are included, a voltage reduction ratio of 3:1 can be achieved, in the case where 3 resonance modules are included, a voltage reduction ratio of 4:1 can be achieved, in the case where 5 resonance modules are included, a voltage reduction ratio of 6:1 can be achieved, and so on.
According to the multi-resonant switched capacitor converter of the present invention, by switching the series-parallel connection of the resonant network and the non-resonant capacitive element provided in one or more resonant modules by a simple topology, the series-parallel connection of the capacitive elements can realize not only a voltage reduction ratio of an even ratio but also a voltage reduction ratio of an odd ratio.
In this embodiment, the multi-resonant switched capacitor converter has an input terminal and an output terminal for converting an input voltage at the input terminal into an output voltage at the output terminal, and includes a power switching element connected to the input terminal, a non-resonant capacitive element coupled to the output terminal, and one or more resonant modules connected to the power switching element and the non-resonant capacitive element. Each resonant module includes a resonant network, a first switching element group configured to connect the resonant network in series with the non-resonant capacitive element, and a second switching element group configured to connect the resonant network in parallel with the non-resonant capacitive element for the same resonant module.
Accordingly, the expansion can be conveniently performed according to the required pressure reduction ratio by utilizing a simple topological structure, so that the pressure reduction ratio of even ratio and the pressure reduction ratio of odd ratio can be realized.
In this embodiment, the resonant network preferably includes a resonant capacitor element and a resonant inductor element connected in series, the first switching element group includes a second switching element, the second switching element group includes a first switching element and a third switching element, the first switching element is connected to a capacitive output terminal of the resonant network, the second switching element is connected to the first switching element and an inductive output terminal of the resonant network, and the third switching element is connected to the second switching element and ground. Accordingly, various voltage reduction ratios can be realized relatively conveniently by the series-parallel connection of the capacitive elements.
In the present embodiment, it is preferable that the first switching element group of each of the power switching element and the resonance module is turned on and the second switching element group of each of the resonance module is turned off during the first period, whereby the resonance network of each of the resonance module is connected in series with the non-resonance capacitive element, and the first switching element group of each of the power switching element and the resonance module is turned off and the second switching element group of each of the resonance module is turned on during the second period, whereby the resonance network of each of the resonance module is connected in parallel with the non-resonance capacitive element. Accordingly, the series-parallel connection of the capacitor elements can be switched by the timing control conveniently, and various voltage reduction ratios of the odd-numbered ratio and the even-numbered ratio can be realized conveniently.
In the present embodiment, when a plurality of resonance modules are included, it is preferable that the capacitance values of the resonance capacitor elements included in the resonance network of each of the resonance modules be equal. Accordingly, the capacitor can be conveniently selected, and the required voltage reduction ratio can be more conveniently realized. Of course, in the present invention, the capacitance values of the respective resonant capacitive elements and the capacitance values of the non-resonant capacitive elements are not particularly limited, and the capacitance values of the respective resonant capacitive elements may not be equal to each other, and may be arbitrarily selected as long as a desired voltage reduction ratio can be achieved by capacitance division.
In the present embodiment, when a plurality of the resonance modules are included, the resonance frequencies of the resonance networks of the resonance modules are preferably equal to each other. Further, it is preferable that the operating frequencies of the respective first, second, and third switching elements of the resonance module are equal to the resonance frequency. In addition, it is preferable that control signals are inputted to the respective first, second, and third switching elements of the resonance module through the driver so that the operating frequencies of the respective first, second, and third switching elements of the resonance module are equal to the resonance frequencies of the respective resonance networks of the resonance module. By operating the switching frequency to be the same as its resonance frequency, zero current off operation can be achieved, and switching losses can be eliminated by implementing soft switching. The LC resonance is utilized to realize the high-efficiency characteristic of soft switching at the resonance point, and the working frequency of the switching element is equal to the LC resonance frequency, so that the high efficiency can be realized while the voltage reduction function is realized. In addition, since a transformer is not used and is not isolated, high efficiency can be achieved.
In the present embodiment, it is preferable that the power switching element and each switching element in each resonance module be formed of an NMOS transistor. In the case where these switching elements are formed of NMOS transistors, for the same resonant module, the drain of the first switching element is connected to the capacitive output terminal of the resonant network, the drain of the second switching element is connected to the source of the first switching element, the source of the second switching element is connected to the inductive output terminal of the resonant network, the drain of the third switching element is connected to the source of the second switching element, and the source of the third switching element is connected to ground. In the case described with reference to fig. 1, as shown in the first resonance module from the left side in fig. 1, the drain of the switching element Q2 is connected to the capacitance output terminal of the resonance network, the drain of the switching element Q6 is connected to the source of the switching element Q2 and the inductance output terminal of the resonance network, and the drain of the switching element Q7 is connected to the source of the switching element Q6 and ground. A control signal is input to the gate of each transistor through a driver.
Although the present invention has been shown above in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that various modifications, substitutions and changes may be made thereto without departing from the technical spirit and scope of the invention. Accordingly, the invention should not be limited by the above-described embodiments, but by the following claims and their equivalents.
Claims (9)
1. A multi-resonant switched capacitor converter having an input terminal and an output terminal for converting an input voltage at the input terminal to an output voltage at the output terminal, characterized in that,
the multi-resonant switched capacitor converter includes:
a power switching element connected to the input terminal;
a non-resonant capacitive element coupled to the output terminal; and
more than one resonance module connected with the power switch element and the non-resonance capacitor element,
the resonant module comprises a resonant network, a first switching element group and a second switching element group,
for the same resonant module, the first switching element group is configured for connecting the resonant network in series with the non-resonant capacitive element, and the second switching element group is configured for connecting the resonant network in parallel with the non-resonant capacitive element.
2. A multi-resonant switched-capacitor converter as claimed in claim 1, wherein,
the resonant network comprises a series connection of a resonant capacitive element and a resonant inductive element,
the first switching element group includes a second switching element, the second switching element group includes a first switching element and a third switching element,
the first switching element is connected with the capacitance output end of the resonance network, the second switching element is connected with the first switching element and the inductance output end of the resonance network, and the third switching element is connected with the second switching element and the ground.
3. A multi-resonant switched-capacitor converter as claimed in claim 1, wherein,
during a first period, the power switching element and the first switching element group of the respective resonant module are turned on, and the second switching element group of the respective resonant module is turned off, whereby the resonant network of the respective resonant module is connected in series with the non-resonant capacitive element,
during a second period, the power switching element and the first switching element group of each of the resonance modules are turned off, and the second switching element group of each of the resonance modules is turned on, whereby the resonance network of each of the resonance modules is connected in parallel with the non-resonance capacitive element.
4. A multi-resonant switched-capacitor converter as claimed in claim 2, wherein,
in the case of including a plurality of the resonance modules, capacitance values of the resonance capacitance elements included in the respective resonance networks of the resonance modules are equal.
5. The multi-resonant switched-capacitor converter of claim 4, wherein,
in the case of including a plurality of the resonance modules, the resonance frequencies of the respective resonance networks of the resonance modules are equal.
6. The multi-resonant switched-capacitor converter of claim 5, wherein,
the operating frequencies of the first switching element, the second switching element and the third switching element of the resonant module are equal to the resonant frequency.
7. A multi-resonant switched-capacitor converter as claimed in claim 2, wherein,
the power switching element and the first, second and third switching elements of the resonance module are each constituted by an NMOS transistor.
8. The multi-resonant switched-capacitor converter of claim 7,
for the same resonance module, the drain electrode of the first switching element is connected with the capacitance output end of the resonance network, the drain electrode of the second switching element is connected with the source electrode of the first switching element, the source electrode of the second switching element is connected with the inductance output end of the resonance network, the drain electrode of the third switching element is connected with the source electrode of the second switching element, and the source electrode of the third switching element is connected with the ground.
9. The multi-resonant switched-capacitor converter of claim 7,
control signals are input to the first switching element, the second switching element and the third switching element of each resonant module through a driver, so that the working frequencies of the first switching element, the second switching element and the third switching element of each resonant module are equal to the resonant frequency of the resonant network of each resonant module.
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