Reconfigurable multi-resonant switched capacitor direct current converter

Abstract

The invention discloses a reconfigurable multi-resonant switched capacitor direct-current converter, which belongs to the field of electronic devices and comprises a 2: 1 input module, an A-side reconfigurable resonant module, a B-side reconfigurable resonant module, a filter circuit and an output load, the A-side reconfigurable resonance module and the B-side reconfigurable resonance module are arranged in parallel among the 2: 1 input module, the filter circuit and the output load; the direct-current converter completes multi-resonant conversion of capacitors and inductors in the A-side reconfigurable resonance module and the B-side reconfigurable resonance module by controlling the conduction time sequence of each switch tube in the 2: 1 input module, the A-side reconfigurable resonance module and the B-side reconfigurable resonance module, two working modes of voltage boosting 8: 1 and 6: 1 are achieved, and through a zero-current modulation strategy, the direct-current converter can achieve multi-resonant conversion of capacitors and inductors in the A-side reconfigurable resonance module and the B-side reconfigurable resonance module. Therefore, the topology of the direct-current converter has high conversion efficiency in low-voltage and large-current application. When the method is applied to a large-scale data center, the voltage fluctuation of the 48V data center bus can be effectively suppressed.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic devices, and in particular to a reconfigurable multi-resonant switched capacitor DC converter. Background Art

[0002] As the demand for large-scale data centers continues to grow, so too does their energy consumption. The 48V busbar in data centers is widely favored due to its low heat loss. In 48V data center power distribution systems, the DC bus voltage is affected by the battery voltage range of the uninterruptible power supply (UPS), which ranges from 36V to 60V. Consequently, in a two-stage architecture, the intermediate bus voltage fluctuates significantly. This invention aims to mitigate this fluctuation through a reconfigurable topology and modulation scheme. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a reconfigurable multi-resonant switched capacitor DC converter with a stable system, flexible structure, and high conversion efficiency during low-voltage and high-current operation; at the same time, it complies with the requirements of the intermediate bus architecture and can meet the needs of large-scale data centers; when applied to large-scale data centers, it can effectively suppress voltage fluctuations of the 48V data center bus.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A reconfigurable multi-resonant switched capacitor DC converter comprises a 2:1 input module, an A-side reconfigurable resonant module capable of constructing multiple resonant paths, a B-side reconfigurable resonant module capable of constructing multiple resonant paths, and a filter circuit capable of stabilizing output voltage and an output load; the A-side reconfigurable resonant module and the B-side reconfigurable resonant module are arranged in parallel between the 2:1 input module and the filter circuit and output load; the DC converter controls the conduction timing of each switch tube in the 2:1 input module, the A-side reconfigurable resonant module, and the B-side reconfigurable resonant module to complete multi-resonant conversion of capacitors and inductors in the A-side reconfigurable resonant module and the B-side reconfigurable resonant module, thereby realizing two operating modes of voltage boosting: 8:1 and 6:1. Furthermore, through a zero-current modulation strategy, the DC converter topology is ensured to have high conversion efficiency in low-voltage, high-current applications.

[0006] A further improvement of the technical solution of the present invention is that: the 2:1 input module includes a DC voltage power supply V in , the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4 and the first capacitor C1; the connection relationship is as follows:

[0007] The drain of the first switch tube S1 is connected to the DC voltage power supply V inThe drain of the second switch tube S2 is connected to the source of the first switch tube S1; the source of the third switch tube S3 is connected to the DC voltage power supply V in The source of the fourth switch tube S4 is connected to the drain of the third switch tube S3; one end of the first capacitor C1 is connected to the source of the first switch tube S1 and the drain of the second switch tube S2, and the other end is connected to the drain of the third switch tube S3 and the source of the fourth switch tube S4.

[0008] A further improvement of the technical solution of the present invention is that the first switch tube S1, the fourth switch tube S4 and the second switch tube S2, the third switch tube S3 are complementarily turned on.

[0009] A further improvement of the technical solution of the present invention is that: the A-side reconfigurable resonant module includes a first switch tube S on the A side 1A , the second switch tube S on the A side 2A , the third switch tube S on the A side 3A , the fourth switch tube S on the A side 4A , the fifth switch tube S on the A side 5A , the sixth switch tube S on the A side 6A , A side second capacitor C 2A 、A side third capacitor C 3A and the A-side inductor L A ; The connection relationship is as follows:

[0010] The first switch tube S on the A side 1A The drain of the second switch tube S2 is connected to the source of the second switch tube S2; 2A The drain of the first switch tube S on the A side 1A The source of the third switch tube S on the A side is connected; 3A The drain of the second switch tube S on the A side 2A The source of the third switch S on the A side is connected 3A The source of the fourth switch tube S on the A side is grounded; 4A The drain of the first switch tube S on the A side is connected to the 1A The source of the second switch tube S on the A side 2A The drain of the fifth switch tube S on the A side is connected; 5A The drain of the fourth switch tube S on the A side 4A The source of the sixth switch tube S on the A side is connected; 6A The drain of the fifth switch tube S on the A side 5A The source of the sixth switch S on the A side is connected 6A The source of the A side second capacitor C 2A One end is connected to the source of the second switch tube S2 and the first switch tube S on the A side. 1A The other end is connected to the drain of the second switch tube S on the A side. 2AThe source and the third switch tube S on the A side 3A Drain connection; A side third capacitor C 3A One end of the switch is connected to the first switch tube S on the A side. 1A The source of the second switch tube S on the A side 2A The other end is connected to the drain of the fifth switch tube S on the A side. 5A The source of the sixth switch tube S on the A side 6A The drain connection of the A side inductor L A One end of the fourth switch tube S on the A side 4A The source of the fifth switch tube S on the A side 5A The other end is connected to the drain of the filter circuit and the fourth capacitor C4 in the output load.

[0011] A further improvement of the technical solution of the present invention is that: the B-side reconfigurable resonant module includes a first switch tube S on the B side 1B , the second switch tube S on the B side 2B , the third switch tube S on the B side 3B , the fourth switch tube S on the B side 4B , the fifth switch tube S on the B side 5B , the sixth switch tube S on the B side 6B and the second capacitor C on the B side 2B 、B side third capacitor C 3B and the B-side inductor L B ; The connection relationship is as follows:

[0012] The first switch tube S on the B side 1B The drain of the second switch tube S is connected to the drain of the fourth switch tube S4; 2B The drain of the first switch tube S on the B side 1B The source of the third switch tube S on the B side is connected; 3B The drain of the second switch tube S on the B side 2B The source of the third switch S on the B side is connected 3B The source of the fourth switch tube S on the B side is grounded; 4B The drain of the first switch tube S on the B side is connected to the 1B The source of the second switch tube S on the B side 2B The drain of the fifth switch tube S on the B side is connected; 5B The drain of the fourth switch tube S on the B side 4B The source of the sixth switch tube S on the B side is connected; 6B The drain of the fifth switch tube S on the B side 5B The source of the sixth switch tube S on the B side is connected 6B The source of the B side is grounded; the second capacitor C 2B One end is connected to the drain of the fourth switch tube S4 and the drain of the first switch tube S on the B side. 1BThe other end is connected to the drain of the second switch tube S on the B side. 2B The source of the third switch tube S on the B side 3B Drain connection; B side third capacitor C 3B One end of the switch is connected to the first switch tube S on the B side. 1B The source of the second switch tube S on the B side 2B The other end is connected to the drain of the fifth switch tube S on the B side. 5B The source of the sixth switch tube S on the B side 6B The drain connection of the B side inductor L B One end of the fourth switch tube S on the B side 4B The source of the fifth switch S on the B side 5B The other end is connected to the drain of the filter circuit and the fourth capacitor C4 in the output load.

[0013] A further improvement of the technical solution of the present invention is that: the second capacitor C on the A side of the reconfigurable resonant module 2A The second capacitor C on the B side of the B side reconfigurable resonant module 2B having equal values; the A-side third capacitor C in the A-side reconfigurable resonant module 3A The B-side third capacitor C in the B-side reconfigurable resonant module 3B The A-side inductor L in the A-side reconfigurable resonant module has the same value as A The B-side inductor L in the B-side reconfigurable resonant module B have equal values, namely: C 2A =C 2B =C2,C 3A =C 3B =C3,L A =L B =L.

[0014] The further improvement of the technical solution of the present invention is that: the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4, the first switch tube S on the A side 1A , the second switch tube S on the A side 2A , the third switch tube S on the A side 3A , the fourth switch tube S on the A side 4A , the fifth switch tube S on the A side 5A , the sixth switch tube S on the A side 6A , the first switch tube S on the B side 1B , the second switch tube S on the B side 2B , the third switch tube S on the B side 3B , the fourth switch tube S on the B side 4B , the fifth switch tube S on the B side 5B , the sixth switch tube S on the B side 6BThey are all MOS tubes or IGBTs.

[0015] A further improvement of the technical solution of the present invention is that: the filter circuit and the output load include a fourth capacitor C4 and a load R connected in parallel with the fourth capacitor C4; one end of the fourth capacitor C4 is connected to the A-side inductor L in the A-side reconfigurable resonant module. A and the B-side reconfigurable resonant module B-measurement inductor L B Connect the other end to ground.

[0016] Due to the adoption of the above technical solution, the technical advancements achieved by the present invention are:

[0017] The present invention provides a 2:1 input module, which can take on part of the step-down function and allow subsequent modules to be connected in an open node manner without a voltage-stabilizing capacitor. A side A reconfigurable resonant module and a side B reconfigurable resonant module are connected in parallel between the 2:1 input module, the wave circuit, and the output load, and both introduce resonant inductors to take on another part of the step-down function. This system not only has the ability to construct multiple resonant paths, but also can achieve multiple gains. The system is stable and has a flexible structure, and can achieve two operating modes of voltage boosting of 8:1 and 6:1. It saves two switches on the basis of the existing converter, and through the zero-current modulation strategy, it ensures that the topology has high conversion efficiency during low-voltage and high-current operation.

[0018] When the present invention is applied to a large-scale data center, it can effectively suppress voltage fluctuations of a 48V data center bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0020] Figure 1 A schematic structural diagram of a reconfigurable multi-resonant switched capacitor DC converter provided in an embodiment of the present invention;

[0021] Figure 2 This is a working waveform diagram of the reconfigurable multi-resonant switched capacitor DC converter provided in an embodiment of the present invention in 8:1 mode;

[0022] Figure 3 This is a diagram showing the input voltage simulation results of the reconfigurable multi-resonant switched capacitor DC converter in 8:1 mode provided in an embodiment of the present invention;

[0023] Figure 4This is a diagram showing the output voltage simulation results of the reconfigurable multi-resonant switched capacitor DC converter in 8:1 mode provided in an embodiment of the present invention;

[0024] Figure 5 This is a diagram showing the simulation results of the inductor current of the reconfigurable multi-resonant switched capacitor DC converter in 8:1 mode provided in an embodiment of the present invention, where I(L1) is the inductor L on the A side. A The current of I(L2) is the inductor L on the B side. B Current;

[0025] Figure 6 This is a working waveform diagram of the reconfigurable multi-resonant switched capacitor DC converter provided in an embodiment of the present invention in 6:1 mode;

[0026] Figure 7 This is a diagram showing the input voltage simulation results of the reconfigurable multi-resonant switched capacitor DC converter in 6:1 mode provided in an embodiment of the present invention;

[0027] Figure 8 This is a diagram showing the output voltage simulation results of the reconfigurable multi-resonant switched capacitor DC converter in 6:1 mode provided in an embodiment of the present invention;

[0028] Figure 9 This is a diagram showing the simulation results of the inductor current of the reconfigurable multi-resonant switched capacitor DC converter in 6:1 mode provided in an embodiment of the present invention, where I(L1) is the inductor L on the A side. A The current of I(L2) is the inductor L on the B side. B Current;

[0029] Among them, 1. 2:1 input module; 2. A-side reconfigurable resonant module; 3. B-side reconfigurable resonant module; 4. Filter circuit and output load. DETAILED DESCRIPTION

[0030] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "several" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0034] like Figure 1 As shown, a reconfigurable multi-resonant switched capacitor DC converter includes a 2:1 input module 1, an A-side reconfigurable resonant module 2 capable of constructing multiple resonant paths, a B-side reconfigurable resonant module 3 capable of constructing multiple resonant paths, and a filter circuit and an output load 4 capable of stabilizing the output voltage; the A-side reconfigurable resonant module 2 and the B-side reconfigurable resonant module 3 are arranged in parallel between the 2:1 input module 1 and the filter circuit and the output load 4; the DC converter completes the multi-resonant conversion of the capacitors and inductors in the A-side reconfigurable resonant module 2 and the B-side reconfigurable resonant module 3 by controlling the conduction timing of each switch tube in the 2:1 input module 1, the A-side reconfigurable resonant module 2 and the B-side reconfigurable resonant module 3, realizing two working modes of voltage boosting 8:1 and 6:1, and through the zero-current modulation strategy, ensures that the DC converter topology has high conversion efficiency in low-voltage and high-current applications.

[0035] 2:1 input module 1: It can take on part of the voltage reduction function and allows subsequent modules to be connected without voltage stabilizing capacitors in an open node manner.

[0036] The A-side reconfigurable resonant module 2 and the B-side reconfigurable resonant module 3 both introduce resonant inductors to take on another part of the voltage reduction function. They not only have the ability to construct multiple resonant paths, but also can achieve multiple gains.

[0037] Furthermore, the 2:1 input module 1 includes: a DC voltage power supply V in, the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4 and the first capacitor C1; the connection relationship is as follows:

[0038] The drain of the first switch tube S1 is connected to the DC voltage power supply V in The drain of the second switch tube S2 is connected to the source of the first switch tube S1; the source of the third switch tube S3 is connected to the DC voltage power supply V in The source of the fourth switch tube S4 is connected to the drain of the third switch tube S3; one end of the first capacitor C1 is connected to the source of the first switch tube S1 and the drain of the second switch tube S2, and the other end is connected to the drain of the third switch tube S3 and the source of the fourth switch tube S4.

[0039] Furthermore, the first switch tube S1 , the fourth switch tube S4 , the second switch tube S2 , and the third switch tube S3 are complementarily turned on.

[0040] Furthermore, the reconfigurable resonant module 2 on the A side includes: a first switch tube S on the A side 1A , the second switch tube S on the A side 2A , the third switch tube S on the A side 3A , the fourth switch tube S on the A side 4A , the fifth switch tube S on the A side 5A , the sixth switch tube S on the A side 6A , A side second capacitor C 2A 、A side third capacitor C 3A and the A-side inductor L A ; The connection relationship is as follows:

[0041] The first switch tube S on the A side 1A The drain of the second switch tube S2 is connected to the source of the second switch tube S2; 2A The drain of the first switch tube S on the A side 1A The source of the third switch tube S on the A side is connected; 3A The drain of the second switch tube S on the A side 2A The source of the third switch S on the A side is connected 3A The source of the fourth switch tube S on the A side is grounded; 4A The drain of the first switch tube S on the A side is connected to the 1A The source of the second switch tube S on the A side 2A The drain of the fifth switch tube S on the A side is connected; 5A The drain of the fourth switch tube S on the A side 4A The source of the sixth switch tube S on the A side is connected; 6A The drain of the fifth switch tube S on the A side 5A The source of the sixth switch S on the A side is connected 6A The source of the A side second capacitor C 2AOne end is connected to the source of the second switch tube S2 and the first switch tube S on the A side. 1A The other end is connected to the drain of the second switch tube S on the A side. 2A The source and the third switch tube S on the A side 3A Drain connection; A side third capacitor C 3A One end of the switch is connected to the first switch tube S on the A side. 1A The source of the second switch tube S on the A side 2A The other end is connected to the drain of the fifth switch tube S on the A side. 5A The source of the sixth switch tube S on the A side 6A The drain connection of the A side inductor L A One end of the fourth switch tube S on the A side 4A The source of the fifth switch tube S on the A side 5A The other end is connected to the drain of the filter circuit and the fourth capacitor C4 in the output load 4.

[0042] Furthermore, the reconfigurable resonant module 3 on the B side includes: a first switch tube S on the B side 1B , the second switch tube S on the B side 2B , the third switch tube S on the B side 3B , the fourth switch tube S on the B side 4B , the fifth switch tube S on the B side 5B , the sixth switch tube S on the B side 6B , B side second capacitor C 2B 、B side third capacitor C 3B and the B-side inductor L B ; The connection relationship is as follows:

[0043] The first switch tube S on the B side 1B The drain of the second switch tube S is connected to the drain of the fourth switch tube S4; 2B The drain of the first switch tube S on the B side 1B The source of the third switch tube S on the B side is connected; 3B The drain and the second switch tube S on the B side 2B The source of the third switch S on the B side is connected 3B The source of the fourth switch tube S on the B side is grounded; 4B The drain of the first switch tube S on the B side is connected to the 1B The source of the second switch tube S on the B side 2B The drain of the fifth switch tube S on the B side is connected; 5B The drain of the fourth switch tube S on the B side 4B The source of the sixth switch tube S on the B side is connected; 6B The drain of the fifth switch tube S on the B side 5B The source of the sixth switch tube S on the B side is connected 6B The source of the B side is grounded; the second capacitor C2B One end is connected to the drain of the fourth switch tube S4 and the drain of the first switch tube S on the B side. 1B The other end is connected to the drain of the second switch tube S on the B side. 2B The source of the third switch tube S on the B side 3B Drain connection; B side third capacitor C 3B One end of the switch is connected to the first switch tube S on the B side. 1B The source of the second switch tube S on the B side 2B The other end is connected to the drain of the fifth switch tube S on the B side. 5B The source of the sixth switch tube S on the B side 6B The drain connection of the B side inductor L B One end of the fourth switch tube S on the B side 4B The source of the fifth switch S on the B side 5B The other end is connected to the drain of the filter circuit and the fourth capacitor C4 in the output load 4;

[0044] Furthermore, the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4, the first switch tube S on the A side 1A , the second switch tube S on the A side 2A , the third switch tube S on the A side 3A , the fourth switch tube S on the A side 4A , the fifth switch tube S on the A side 5A , the sixth switch tube S on the A side 6A , the first switch tube S on the B side 1B , the second switch tube S on the B side 2B , the third switch tube S on the B side 3B , the fourth switch tube S on the B side 4B , the fifth switch tube S on the B side 5B , the sixth switch tube S on the B side 6B They are all MOS tubes or IGBTs.

[0045] Furthermore, the second capacitor C on the A side 2A The second capacitor C on the B side 2B The third capacitor C on side A has the same value as the 3A The third capacitor C on the B side 3B With equal value; A side inductor L A With the B-side inductor L B have equal values, namely: C 2A =C 2B =C2,C 3A =C 3B =C3,L A =L B =L.

[0046] Furthermore, the filter circuit and the output load 4 include a fourth capacitor C4 and a load R connected in parallel with the fourth capacitor C4; one end of the fourth capacitor C4 is connected to the A-side inductor L A and B measuring inductor L B Connect the other end to ground.

[0047] The present invention provides a reconfigurable multi-resonant switched capacitor DC converter that controls the conduction timing of each switch tube in the 2:1 input module 1, the A-side reconfigurable resonant module 2, and the B-side reconfigurable resonant module 3 to complete the multi-resonant conversion of the capacitors and inductors in the A-side reconfigurable resonant module 2 and the B-side reconfigurable resonant module 3, thereby realizing a voltage boost 8:1 working mode and a voltage boost 6:1 working mode. The working timing of each switch tube in the two modes is as follows: Figure 2 and Figure 6 shown.

[0048] (1) The specific working principle of achieving the voltage boosting mode of 8:1 is as follows:

[0049] like Figure 2 As shown, the state of the reconfigurable resonance module 2 on the A side is 1, which controls the second switch tube S2, the third switch tube S3, and the second switch tube S on the A side. 2A and the fifth switch tube S on the A side 5A Turn on, DC voltage supply V in Disconnect, the first capacitor C1 to the A side second capacitor C A2 and the third capacitor C on side A A3 At this time, the first capacitor C1 and the second capacitor C on the A side are charged. A2 、A side third capacitor C A3 and the A-side inductor L A The resonant cavity is composed of a resonant cavity, and the resonant frequency of the resonant cavity is:

[0050]

[0051] In this state, there are:

[0052] V C1 =V C2 +V C3 +V O

[0053] State 2 of the reconfigurable resonant module 2 on side A controls the first switch tube S on side A. 1A , the third switch tube S on the A side 3A and the fifth switch tube S on the A side 5A The first capacitor C1 is turned on, the second capacitor C on the A side is turned off, A2 To the A side third capacitor C A3 At this time, the second capacitor C on the A side A2、A side third capacitor C A3 and the A-side inductor L A The resonant cavity is composed of a resonant cavity, and the resonant frequency of the resonant cavity is:

[0054]

[0055] In this state, there are:

[0056] V C2 =V C3 +V O

[0057] State 3 of the reconfigurable resonant module 2 on side A controls the fourth switch tube S on side A. 4A and the sixth switch tube S on the A side 6A The first capacitor C1 and the second capacitor C on the A side are turned on. A2 Disconnect, the third capacitor C on side A A3 Discharge. At this time, the third capacitor C on the A side A3 and the A-side inductor L A The resonant cavity is composed of a resonant cavity, and the resonant frequency of the resonant cavity is:

[0058]

[0059] C eq1,3 =C3

[0060] In this state, there are:

[0061] V C3 =V O

[0062] State 1 of the reconfigurable resonant module 3 on the B side controls the first switch tube S1, the fourth switch tube S4, and the second switch tube S on the B side. 2B and the fifth switch tube S on the B side 5B Turn on, DC voltage supply V in To the first capacitor C1, the second capacitor C B2 and the third capacitor C on the B side B3 Charging, resonant frequency and f 1,1 same;

[0063] In this state, there are:

[0064] V in =V C1 +V C2 +V C3 +V O

[0065] State 2 of the reconfigurable resonant module 3 on the B side controls the first switch tube S on the B side. 1B , the third switch tube S on the B side 3Band the fifth switch tube S on the B side 5B The first capacitor C1 is turned on, the second capacitor C on the B side is turned off, B2 To the B side the third capacitor C B3 Charging, resonant frequency and f 1,2 same;

[0066] In this state, there are:

[0067] V C2 =V C3 +V O

[0068] State 3 of the reconfigurable resonant module 3 on the B side controls the fourth switch tube S on the B side. 4B and the sixth switch tube S on the B side 6B The first capacitor C1 and the second capacitor C on the B side are turned on. B2 Disconnect, the third capacitor C on the B side B3 discharge, resonant frequency and f 1,3 same.

[0069] In this state, there are:

[0070] V C3 =V O

[0071] From the above formula we can get:

[0072] V in =8V O

[0073] like Figure 3 and Figure 4 As shown, the input voltage is set to 60V, and the formula derived from the above disclosure can be obtained as V O =7.5V. It can be seen from the simulation waveform that the output voltage is approximately 7.5V, which matches the theoretical calculated value.

[0074] The duration of each state is half of the resonant period, and the proposed converter period T1 is obtained as:

[0075]

[0076] The duty cycle of each state is the ratio of the state duration to the period T1:

[0077]

[0078]

[0079] like Figure 5 As shown, it can be seen that the A-side inductor L A and the B-side inductor L BThe error between the current waveform simulation results and the prediction is very small and almost matches.

[0080] (2) The specific working principle of achieving a voltage boost of 6:1 working mode is as follows:

[0081] like Figure 6 As shown, the state of the reconfigurable resonant module 2 on the A side is four, controlling the second switch tube S2, the third switch tube S3, and the second switch tube S on the A side. 2A and the fifth switch tube S on the A side 5A Turn on, DC voltage supply V in Disconnect, the first capacitor C1 to the A side second capacitor C A2 and the third capacitor C on side A A3 Charging. At this time, the resonant frequency of the resonant cavity is:

[0082]

[0083] In this state, there are:

[0084] V C1 =V C2 +V C3 +V O

[0085] The reconfigurable resonant module 2 on the A side is in state 5, controlling the first switch tube S on the A side. 1A , the third switch tube S on the A side 3A , the fourth switch tube S on the A side 4A and the sixth switch tube S on the A side 6A The first capacitor C1 is turned on, the second capacitor C on the A side is turned off, A2 and the third capacitor C on side A A3 Discharge. At this time, the resonant frequency of the resonant cavity is:

[0086]

[0087] In this state, there are:

[0088] V C2 =V O

[0089] V C3 =V O

[0090] State 4 of the reconfigurable resonant module 3 on the B side controls the first switch tube S1, the fourth switch tube S4, and the second switch tube S on the B side. 2B and the fifth switch tube S on the B side 5B Turn on, DC voltage supply V in To the first capacitor C1, the second capacitor C B2 and the third capacitor C on the B sideB3 Charging, resonant frequency and f 2,1 same;

[0091] In this state, there are:

[0092] V in =V C1 +V C2 +V C3 +V O

[0093] State 5 of the reconfigurable resonant module 3 on the B side controls the first switch tube S on the B side. 1B , the third switch tube S on the B side 3B , the fourth switch tube S on the B side 4B and the sixth switch tube S on the B side 6B The first capacitor C1 is turned on, the second capacitor C on the B side is turned off, B2 and the third capacitor C on the B side B3 discharge, resonant frequency and f 2,2 same.

[0094] In this state, there are:

[0095] V C2 =V O

[0096] V C3 =V O

[0097] From the above formula we can get:

[0098] V in =6V O

[0099] like Figure 7 and Figure 8 As shown, the input voltage is set to 60V, and the formula derived from the above disclosure can be obtained as V O =10V. It can be seen from the simulation waveform that the output voltage is approximately 10V, which matches the theoretical calculated value.

[0100] The duration of each state is half of the resonant period, and the proposed converter period T2 is obtained as:

[0101]

[0102] The duty cycle of each state is the ratio of the state duration to the period T2:

[0103]

[0104]

[0105] like Figure 9 As shown, it can be seen that the A-side inductor L A and the B-side inductor L B The error between the current waveform simulation results and the prediction is very small and almost matches.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reconfigurable multi-resonant switched capacitor DC converter, characterized in that: The invention comprises a 2:1 input module (1), an A-side reconfigurable resonant module (2) capable of constructing multiple resonant paths, a B-side reconfigurable resonant module (3) capable of constructing multiple resonant paths, and a filter circuit and an output load (4) capable of stabilizing the output voltage; the A-side reconfigurable resonant module (2) and the B-side reconfigurable resonant module (3) are arranged in parallel between the 2:1 input module (1) and the filter circuit and the output load (4); the DC converter completes the multi-resonance conversion of the capacitors and inductors in the A-side reconfigurable resonant module (2) and the B-side reconfigurable resonant module (3) by controlling the conduction timing of each switch tube in the 2:1 input module (1), the A-side reconfigurable resonant module (2) and the B-side reconfigurable resonant module (3), realizes two working modes of voltage boosting 8:1 and 6:1, and ensures that the topology of the DC converter has high conversion efficiency in low-voltage and high-current applications through a zero-current modulation strategy.

2. The reconfigurable multi-resonant switched capacitor DC converter according to claim 1, characterized in that: The 2:1 input module (1) includes a DC voltage power supply V in , the first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4 and the first capacitor C1; the connection relationship is as follows: The drain of the first switch tube S1 is connected to the DC voltage power supply V in The drain of the second switch tube S2 is connected to the source of the first switch tube S1; the source of the third switch tube S3 is connected to the DC voltage power supply V in The source of the fourth switch tube S4 is connected to the drain of the third switch tube S3; one end of the first capacitor C1 is connected to the source of the first switch tube S1 and the drain of the second switch tube S2, and the other end is connected to the drain of the third switch tube S3 and the source of the fourth switch tube S4.

3. The reconfigurable multi-resonant switched capacitor DC converter according to claim 2, characterized in that: The first switch tube S1, the fourth switch tube S4, the second switch tube S2, and the third switch tube S3 are complementarily turned on.

4. The reconfigurable multi-resonant switched capacitor DC converter according to claim 2, characterized in that: The A-side reconfigurable resonant module (2) includes a first switch tube S on the A-side 1A , the second switch tube S on the A side 2A , the third switch tube S on the A side 3A , the fourth switch tube S on the A side 4A , the fifth switch tube S on the A side 5A , the sixth switch tube S on the A side 6A , A side second capacitor C 2A 、A side third capacitor C 3A and the A-side inductor L A ; The connection relationship is as follows: The first switch tube S on the A side 1A The drain of the second switch tube S2 is connected to the source of the second switch tube S2; 2A The drain of the first switch tube S on the A side 1A The source of the third switch tube S on the A side is connected; 3A The drain of the second switch tube S on the A side 2A The source of the third switch S on the A side is connected 3A The source of the fourth switch tube S on the A side is grounded; 4A The drain of the first switch tube S on the A side is connected to the 1A The source of the second switch tube S on the A side 2A The drain of the fifth switch tube S on the A side is connected; 5A The drain of the fourth switch tube S on the A side 4A The source of the sixth switch tube S on the A side is connected; 6A The drain of the fifth switch tube S on the A side 5A The source of the sixth switch S on the A side is connected 6A The source of the A side second capacitor C 2A One end is connected to the source of the second switch tube S2 and the first switch tube S on the A side. 1A The other end is connected to the drain of the second switch tube S on the A side. 2A The source and the third switch tube S on the A side 3A Drain connection; A side third capacitor C 3A One end of the switch is connected to the first switch tube S on the A side. 1A The source of the second switch tube S on the A side 2A The other end is connected to the drain of the fifth switch tube S on the A side. 5A The source of the sixth switch tube S on the A side 6A The drain connection of the A side inductor L A One end of the fourth switch tube S on the A side 4A The source of the fifth switch tube S on the A side 5A The other end is connected to the drain of the filter circuit and the fourth capacitor C4 in the output load (4).

5. The reconfigurable multi-resonant switched capacitor DC converter according to claim 2, characterized in that: The B-side reconfigurable resonance module (3) includes a B-side first switch tube S 1B , the second switch tube S on the B side 2B , the third switch tube S on the B side 3B , the fourth switch tube S on the B side 4B , the fifth switch tube S on the B side 5B , the sixth switch tube S on the B side 6B and the second capacitor C on the B side 2B 、B side third capacitor C 3B and the B-side inductor L B ; The connection relationship is as follows: The first switch tube S on the B side 1B The drain of the second switch tube S is connected to the drain of the fourth switch tube S4; 2B The drain of the first switch tube S on the B side 1B The source of the third switch tube S on the B side is connected; 3B The drain of the second switch tube S on the B side 2B The source of the third switch tube S on the B side is connected 3B The source of the fourth switch tube S on the B side is grounded; 4B The drain of the first switch tube S on the B side is connected to the 1B The source of the second switch tube S on the B side 2B The drain of the fifth switch tube S on the B side is connected; 5B The drain of the fourth switch tube S on the B side 4B The source of the sixth switch tube S on the B side is connected; 6B The drain of the fifth switch tube S on the B side 5B The source of the sixth switch tube S on the B side is connected 6B The source of the B side is grounded; the second capacitor C 2B One end is connected to the drain of the fourth switch tube S4 and the drain of the first switch tube S on the B side. 1B The other end is connected to the drain of the second switch tube S on the B side. 2B The source of the third switch tube S on the B side 3B Drain connection; B side third capacitor C 3B One end of the switch is connected to the first switch tube S on the B side. 1B The source of the second switch tube S on the B side 2B The other end is connected to the drain of the fifth switch tube S on the B side. 5B The source of the sixth switch tube S on the B side 6B The drain connection of the B side inductor L B One end of the fourth switch tube S on the B side 4B The source of the fifth switch S on the B side 5B The other end is connected to the drain of the filter circuit and the fourth capacitor C4 in the output load (4).

6. The reconfigurable multi-resonant switched capacitor DC converter according to claim 4 or 5, characterized in that: The A-side second capacitor C in the A-side reconfigurable resonance module (2) 2A and the B-side second capacitor C in the B-side reconfigurable resonance module (3) 2B having equal values; the A-side third capacitor C in the A-side reconfigurable resonant module (2) 3A and the B-side third capacitor C in the B-side reconfigurable resonant module (3) 3B having equal values; the A-side inductor L in the A-side reconfigurable resonant module (2) A and the B-side inductor L in the B-side reconfigurable resonant module (3) B Have equal values, namely: C 2A =C 2B =C2,C 3A =C 3B =C3,L A =L B =L.

7. The reconfigurable multi-resonant switched capacitor DC converter according to claim 4 or 5, characterized in that: The first switch tube S1, the second switch tube S2, the third switch tube S3, the fourth switch tube S4, the first switch tube S on the A side 1A , the second switch tube S on the A side 2A , the third switch tube S on the A side 3A , the fourth switch tube S on the A side 4A , the fifth switch tube S on the A side 5A , the sixth switch tube S on the A side 6A , the first switch tube S on the B side 1B , the second switch tube S on the B side 2B , the third switch tube S on the B side 3B , the fourth switch tube S on the B side 4B , the fifth switch tube S on the B side 5B , the sixth switch tube S on the B side 6B They are all MOS tubes or IGBTs.

8. The reconfigurable multi-resonant switched capacitor DC converter according to claim 1, characterized in that: The filter circuit and output load (4) include a fourth capacitor C4 and a load R connected in parallel with the fourth capacitor C4; one end of the fourth capacitor C4 is connected to the A-side inductor L in the A-side reconfigurable resonant module (2) A and the B-side reconfigurable resonant module (3) in the B-side inductor L B Connect the other end to ground.

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