Power conversion topology of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification and a power conversion structure based thereon

Abstract

The present invention discloses a power conversion topology of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification, which includes at least k switched-capacitor converters connected in series through wires and connected to both ends of an input power supply in parallel, and an output switched-capacitor. When the turns ratio N is an even number, k = N / 2; when the turns ratio N is an odd number, k is the smallest integer greater than N / 2; the lower end of the output switched-capacitor is grounded, and an output interface is connected between both ends of the output switched-capacitor; it further includes k switched-resonant cavity converters. When the turns ratio N is an even number, k = N / 2; when the turns ratio N is an odd number, k is the smallest integer greater than N / 2. The present invention also discloses two power conversion structures and those based thereon.

Description

Technical Field

[0001] The present invention relates to a power conversion structure, and more specifically, to a power conversion topology of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification for distributed power systems and general load point applications, and a power conversion structure based thereon. Background Art

[0002] In data centers and electric vehicles, there is an increasing need for more efficient power conversion topologies from distributed power systems to load point applications. An existing voltage conversion circuit for realizing the above functions, such as Figure 1 shown, includes a resonant cavity, switches, control logic, and one or more non-resonant capacitors. The control logic generates two or more sets of control signal inputs that are applied to the inputs of the switches, so as to form one or more sub-circuit loops for each set of control signals, and one or more sub-circuit loops for the first set of control signals are different from one or more sub-circuit loops for the second set of control signals. Each sub-circuit loop includes one or more resonant loops, and at least one sub-circuit loop includes a non-resonant capacitor. However, this transformer structure is complex and the manufacturing cost is high. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a power conversion topology of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification, which has a simple structure and low manufacturing cost.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: a power conversion topology of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification, including at least k switched-capacitor converters connected in series in sequence through wires and connected to both ends of an input power supply, and an output switched-capacitor. When the voltage transformation ratio N is an even number, k = N / 2; when the voltage transformation ratio N is an odd number, k is the smallest integer greater than N / 2; the lower end of the output switched-capacitor is grounded, and an output interface is connected between both ends of the output switched-capacitor; it also includes k switched-capacitor resonant cavity converters. When the voltage transformation ratio N is an even number, k = N / 2; when the voltage transformation ratio N is an odd number, k is the smallest integer greater than N / 2;

[0005] The switched resonant cavity converter includes an input component, an output component, and a connection component connecting the two. The input component includes a first MOSFET switch and a second MOSFET switch connected in series by a wire. The output component includes a third MOSFET switch and a fourth MOSFET switch connected in series by a wire. The connection component includes a resonant capacitor and a resonant inductor connected in series by a wire. One end of the connection component close to the resonant capacitor is connected to the wire between the first MOSFET switch and the second MOSFET switch, and the other end of the connection component is connected to the wire between the third MOSFET switch and the fourth MOSFET switch; a first signal input terminal is respectively provided on the first MOSFET switch and the third MOSFET switch; a second signal input terminal is respectively provided on the second MOSFET switch and the fourth MOSFET switch; the first MOSFET switch and the third MOSFET switch are turned on and off at the same time, and the second MOSFET switch and the fourth MOSFET switch are turned on and off at the same time; and the quality factor Q of the switched resonant cavity converter satisfies: 0.1 ≤ Q ≤ 10;

[0006] The first MOSFET switch and the second MOSFET switch of the input component of each switched resonant cavity converter are respectively connected to both ends of the corresponding switching capacitor. The fourth MOSFET switch of the output component of each switched resonant cavity converter is connected to the lower end of the output switching capacitor. The third MOSFET switch of the output component of at least one switched resonant cavity converter is connected to the upper end of any other switching capacitor on the side of the corresponding switching capacitor of this switched resonant cavity converter close to the output switching capacitor; the third MOSFET switch of the output component of each of the remaining switched resonant cavity converters is connected to the upper end of the output switching capacitor or the upper end of any other switching capacitor on the side of the corresponding switching capacitor of this switched resonant cavity converter close to the output switching capacitor.

[0007] As a preferred solution, there is a dead time between each switching event in the switched resonant cavity converter, that is, the time when both the first signal input terminal and the second signal input terminal are turned off, and the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all in the on state.

[0008] As a preferred solution, the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all zero-current switches.

[0009] As a preferred solution, the capacitance value of the switching capacitor is one order of magnitude higher than the capacitance value of the resonant capacitor.

[0010] As a preferred solution, the capacitance value of the output switched capacitor is one order of magnitude higher than that of the resonant capacitor.

[0011] Another technical problem to be solved by the present invention is to provide a power conversion topology with a simple structure and low manufacturing cost.

[0012] To solve the above technical problems, the technical solution adopted by the present invention is: a power conversion structure, including at least two power conversion topologies of the polyphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification as described in any of the above items and arranged in parallel.

[0013] To solve the above technical problems, another technical solution adopted by the present invention is: a power conversion structure, including at least two voltage conversion components connected in series, and each voltage conversion component includes one or more than two power conversion topologies of the polyphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification as described in any of the above items and arranged in parallel.

[0014] To solve the above technical problems, another technical solution adopted by the present invention is: a power conversion structure, including a power conversion component and a point-of-load conversion component connected in series, the power conversion component includes a plurality of power conversion topologies of the polyphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification as described in any of the above items and arranged in parallel, and the point-of-load conversion component includes a plurality of point-of-load converters arranged in parallel.

[0015] The beneficial effects of the present invention are: The power conversion topology is constructed based on a circuit carrier structure, such as a printed circuit board, a silicon substrate, or any other circuit carrier structure. This power conversion topology can be widely applied to high-ratio DC-DC bus conversions that do not require current isolation. For example, data centers, electric vehicles, robots, and security systems. Compared with the prior art solutions, its advantage lies in achieving the required voltage conversion ratio with fewer components through different combination methods between the resonant converter and the switched capacitor. At the same time, due to the reduction in the total number of electronic components, the cost of the BoM will be significantly reduced, which is more conducive to the large-scale mass production of products.

[0016] Each individual energy conversion sub - circuit loop in this power conversion topology has an inductive impedance, and due to the di / dt limitation of the inductive impedance, the flying capacitor is softly charged and discharged during normal operation. This overcomes the inherent weakness of traditional SCC (Switching Capacitor Converter), where large inrush currents are generated, instantaneously causing charge redistribution losses and resulting in high switching losses and high RMS current losses. When the switch of this power conversion topology clamps its drain - source voltage (Vds) during the off - state, the parasitic ringing between the resonant inductor and the switch junction capacitor will be eliminated, thus reducing the stress on each switch. In addition, benefiting from the resonant operation of the resonant cavity, the switches of this power conversion topology can be controlled in a zero - current - switching manner, resulting in very low or negligible switching losses and very high efficiency, compared to those without zero - current - switching. A cheaper and more compact solution is achieved, and simplicity, modularity, and scalability are provided.

[0017] Since the power conversion structure includes power conversion components and point - of - load conversion components connected in series, the power conversion components include a power conversion topology with multiple parallel - set poly - phase switched - capacitor resonant - cavity conversion circuits having full - wave output rectification, and the point - of - load conversion components include several parallel - set point - of - load converters; a two - stage conversion method is adopted for the microprocessor (CPU, GPU, ASIC, etc.) core rails, memory rails, etc. The first - stage bus converter uses SCTC to step down the input 48V bus to the intermediate bus of 12V. Then single - phase or poly - phase PoL is used for the second - stage point - of - load power conversion. Description of the Drawings

[0018] Figure 1 is the block diagram of the dual - transformer power supply design

[0019] Figure 2 is the schematic diagram of the switched resonant - cavity converter

[0020] Figure 3 is the 4 - 1 power conversion topology diagram

[0021] Figure 4 is Figure 3 the timing diagram of the switch control input signal of the power conversion topology diagram in

[0022] Figure 5 is the 8 - 1 power conversion topology diagram

[0023] Figure 6 is another 8 - 1 power conversion topology diagram

[0024] Figure 7 is the 2 - 1 power conversion topology diagram

[0025] Figure 8 is a kind of power conversion structure diagram

[0026] Figure 9 Schematic diagram of a power conversion structure including a power conversion component and a point-of-load conversion component connected in series Detailed implementation mode

[0027] The following combines the accompanying drawings to describe in detail the specific implementation of the present invention.

[0028] Example 1, as Figure 2-3 shown, a 4-1 power conversion topology of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification, including two switched-capacitor converters C1 and C2 connected in series through wires and connected to both ends of the input power supply in sequence, and an output switched-capacitor C0. The lower end of the output switched-capacitor is grounded, and an output interface is connected between both ends of the output switched-capacitor; it also includes two switched-resonant cavity converters L1 and L2;

[0029] Among them, the switched-resonant cavity converter, as Figure 2 shown, includes an input component, an output component, and a connection component connecting the two. The input component includes a first MOSFET switch and a second MOSFET switch connected in series through wires. The output component includes a third MOSFET switch and a fourth MOSFET switch connected in series through wires. The connection component includes a resonant capacitor and a resonant inductor connected in series through wires. One end of the connection component close to the resonant capacitor is connected to the wire between the first MOSFET switch and the second MOSFET switch, and the other end of the connection component is connected to the wire between the third MOSFET switch and the fourth MOSFET switch; a first signal input terminal is respectively provided on the first MOSFET switch and the third MOSFET switch; a second signal input terminal is respectively provided on the second MOSFET switch and the fourth MOSFET switch; the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all zero-current switches. The first MOSFET switch and the third MOSFET switch are turned on and off at the same time, and the second MOSFET switch and the fourth MOSFET switch are turned on and off at the same time; and the quality factor Q of the switched-resonant cavity converter satisfies: 0.1 ≤ Q ≤ 10;

[0030] There is a dead time between each switching event in the switched-resonant cavity converter, that is, the time when both the first signal input terminal and the second signal input terminal are turned off, and the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all in the on state.

[0031] The capacitance value of the switched-capacitor converter is one order of magnitude higher than that of the resonant capacitor. The capacitance value of the output switched-capacitor is one order of magnitude higher than that of the resonant capacitor.

[0032] For each switching resonant cavity converter Lj (j = 1, 2), the first MOSFET switch and the second MOSFET switch of the input component are respectively connected to both ends of the corresponding switching capacitor Ci (i = 1, 2). The fourth MOSFET switch of the output component of each switching resonant cavity converter Lj (j = 1, 2) is connected to the lower end of the output switching capacitor. The third MOSFET switch of the output component of the switching resonant cavity converter L2 is connected to the upper end of the switching capacitor C1. The third MOSFET switch of the output component of the switching resonant cavity converter L1 is connected to the upper end of the output switching capacitor C0.

[0033] In the initial operation stage, the input voltage is equivalently divided into three parts of energy stored in each switching capacitor C2, C1 and the output switching capacitor C0. The switching resonant cavity converter L2 will transfer the energy stored in C2 to C1 and C0 through the resonant cavity. The switching resonant cavity converter L1 will transfer the energy stored in C1 to C0 through the resonant cavity. To achieve the final voltage conversion from 48V to 12V with a ratio of 4 - 1.

[0034] The inside of the resonant cavity of this circuit needs to maintain its own synchronization, but multiple resonant cavities are independent of each other. Whether it is the period, phase, or frequency, there is no requirement for a synchronization relationship between the resonant cavities.

[0035] The first set of switch control signals S1 and the second set of switch control signals S2 have a 180 - degree phase shift. The duty cycles of the two control signal inputs are the same or approximately the same. Each switching resonant cavity converter of the energy conversion loop includes a resonant inductor and a resonant capacitor. When the switch is in the off state, the switching capacitors C1, C2 and C0 in the energy conversion loop help to clamp the voltage across the switch terminals. The switch control signals S1 and S2 control the switches so that they turn on and off at zero current, that is, zero - current switching (ZCS). Compared with the state when current flows through the switch, this zero - current switching ZCS function can reduce the switching loss.

[0036] The "on" and "off" times of each switch state depend on the resonant frequencies of the resonant inductor and the resonant capacitor involved in that specific switch state. In addition, since the switching capacitors C1, C2 and C0 generally do not participate in resonance, such capacitors can reasonably be regarded as voltage sources, and their influence on the resonant frequency can be ignored. Ideally, the "on" time of the switch state is equal to half of the sine resonant period of the equivalent resonant circuit. In practice, because the series resistance introduces some damping to the resonant circuit, the actual "on" time of each switch state can be adjusted to deviate slightly from half of the sine resonant time period to achieve zero - current switching (ZCS).

[0037] Figure 4The timing diagrams shown respectively illustrate the current waveforms of the input signals S1 and S2 of the switches, as well as the first MOSFET switch Q1 and the second MOSFET switch Q2 in their charging and discharging states. As shown in the timing diagrams, the switching timings in the control signal S1 and the switching timings in the control signal S2 are switched to "on" and "off" respectively according to the resonance frequency. This helps to achieve zero current switching (ZCS), as shown by the currents in the first MOSFET switch Q1 and the second MOSFET switch Q2 during their respective charging and discharging. The resulting current in the resonance circuit is shown as the LR current in the figure.

[0038] There is a dead time between each state, during which both the control signals S1 and S2 are in the "off" state, and all the switches of the circuit are in the open state. In this case, the duty cycles of the first set and the second set of control signals S1 and S2 are each less than 50%. When all the switches are closed, this dead time is usually minimized to accommodate the current reset, and zero current switching ZCS can be achieved by setting the switching times of the two sets of control signals S1 and S2 to be approximately half of the sinusoidal resonance period of the resonance circuit and taking into account the resistance damping in the circuit elements.

[0039] Since the capacitance of the switching capacitor is much higher than the capacitance of the resonance capacitor in the resonator, the equivalent series capacitance is mainly determined by the smaller resonance capacitor.

[0040] It should be noted that a single switching capacitor or a single output switching capacitor can also be replaced by a capacitor bank with the same capacitance value.

[0041] Embodiment 2, as Figure 5 shown, has an 8-1 power conversion topology of a multiphase switched-capacitor resonator conversion circuit with full-wave output rectification, including 4 switching capacitors Ci (i is 1, 2, 3... 4) connected in series in sequence through wires and connected to both ends of the input power supply, and an output switching capacitor C0. The lower end of the output switching capacitor is grounded, and an output interface is connected between the two ends of the output switching capacitor; it also includes 4 switch resonator converters Lj (j is 1, 2, 3... 4);

[0042] A switched resonant cavity converter includes an input component, an output component, and a connection component connecting the two. The input component includes a first MOSFET switch and a second MOSFET switch connected in series by a wire. The output component includes a third MOSFET switch and a fourth MOSFET switch connected in series by a wire. The connection component includes a resonant capacitor and a resonant inductor connected in series by a wire. One end of the connection component near the resonant capacitor is connected to the wire between the first MOSFET switch and the second MOSFET switch, and the other end of the connection component is connected to the wire between the third MOSFET switch and the fourth MOSFET switch. A first signal input terminal is provided on each of the first MOSFET switch and the third MOSFET switch. A second signal input terminal is provided on each of the second MOSFET switch and the fourth MOSFET switch. The first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all zero-current switches. The first MOSFET switch and the third MOSFET switch are turned on and off at the same time, and the second MOSFET switch and the fourth MOSFET switch are turned on and off at the same time. And the quality factor Q of the switched resonant cavity converter Lj (j is 1, 2, 3... 4) satisfies: 0.1 ≤ Q ≤ 10;

[0043] In the switched resonant cavity converter Lj (j is 1, 2, 3... 4), there is a dead time between each switching event, that is, the time when both the first signal input terminal and the second signal input terminal are off, and the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all in the on state.

[0044] The capacitance value of the conversion switch capacitor is one order of magnitude higher than that of the resonant capacitor. The capacitance value of the output switch capacitor is one order of magnitude higher than that of the resonant capacitor.

[0045] The first MOSFET switch and the second MOSFET switch of the input component of each switched resonant cavity converter Lj are respectively connected to both ends of the corresponding conversion switch capacitor Ci. The fourth MOSFET switch of the output component of each switched resonant cavity converter Lj is connected to the lower end of the output switch capacitor C0. The third MOSFET switch of the output component of the switched resonant cavity converter L4 is connected to the upper end of the conversion switch capacitor C3. The third MOSFET switches of the output components of the switched resonant cavity converters L2, L3, and L1 are connected to the upper end of the output switch capacitor C0.

[0046] In the initial operation stage, the input voltage is equivalently divided into 5 parts, and the respective energies are stored in the conversion switch capacitor and the output switch capacitor.

[0047] Then, the switched resonant cavity converter L4 transfers the energy stored in C4 to C1, C2, C3, and C0 through the resonant cavity. The switched resonant cavity converter L3 transfers the energy stored in C3 to C0 through the resonant cavity. The switched resonant cavity converter L2 transfers the energy stored in C2 to C0 through the resonant cavity. The switched resonant cavity converter L1 transfers the energy stored in C1 to C0 through the resonant cavity. A voltage conversion with a ratio of 8 - 1 from 48V to 6V can be achieved finally.

[0048] Embodiment 3, as Figure 6 shown, an 8 - 1 power conversion topology of a multiphase switched - capacitor resonant cavity conversion circuit with full - wave output rectification, including 4 switched - capacitor Ci (i = 1, 2, 3, 4) connected in series in turn through wires and connected to both ends of the input power supply, and an output switched - capacitor; the lower end of the output switched - capacitor is grounded, and an output interface is connected between both ends of the output switched - capacitor; it also includes 4 switched resonant cavity converters Lj (j = 1, 2, 3, 4),

[0049] The switched resonant cavity converter Lj (j = 1, 2, 3...4) includes an input component, an output component, and a connection component connecting the two. The input component includes a first MOSFET switch and a second MOSFET switch connected in series through wires. The output component includes a third MOSFET switch and a fourth MOSFET switch connected in series through wires. The connection component includes a resonant capacitor and a resonant inductor connected in series through wires. One end of the connection component close to the resonant capacitor is connected to the wire between the first MOSFET switch and the second MOSFET switch, and the other end of the connection component is connected to the wire between the third MOSFET switch and the fourth MOSFET switch; a first signal input terminal is respectively provided on the first MOSFET switch and the third MOSFET switch; a second signal input terminal is respectively provided on the second MOSFET switch and the fourth MOSFET switch; the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all zero - current switches. The first MOSFET switch and the third MOSFET switch are turned on and off at the same time, and the second MOSFET switch and the fourth MOSFET switch are turned on and off at the same time; and the quality factor Q of the switched resonant cavity converter Lj (j = 1, 2, 3...4) satisfies: 0.1 ≤ Q ≤ 10;

[0050] There is a dead - time between each switching event in the switched resonant cavity converter Lj (j = 1, 2, 3...4), that is, the time when both the first signal input terminal and the second signal input terminal are closed, and the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all in the on - state.

[0051] The capacitance value of the switching capacitor is one order of magnitude higher than that of the resonant capacitor. The capacitance value of the output switching capacitor is one order of magnitude higher than that of the resonant capacitor.

[0052] For each switching resonant cavity converter Lj (where j = 1, 2, 3, 4), the first MOSFET switch and the second MOSFET switch of the input component are respectively connected to both ends of the corresponding switching capacitor Ci (where i = 1, 2, 3, 4). The fourth MOSFET switch of the output component of each switching resonant cavity converter Lj (where j = 1, 2, 3, 4) is connected to the lower end of the output switching capacitor. The third MOSFET switch of the output components of the switching resonant cavity converters L4, L2, and L3 is connected to the upper end of the switching capacitor C1. The third MOSFET switch of the output component of the switching resonant cavity converter L1 is connected to the upper end of the output switching capacitor C0.

[0053] In the initial operation stage, the input voltage is equivalently divided into 5 parts and stored in each switching capacitor and the output switching capacitor respectively.

[0054] Then, the switching resonant cavity converter L4 transfers the energy stored in C4 to C1 and C0 through the resonant cavity. The switching resonant cavity converter L3 transfers the energy stored in C3 to C1 and C0 through the resonant cavity. The switching resonant cavity converter L2 transfers the energy stored in C2 to C1 and C0 through the resonant cavity. The switching resonant cavity converter L1 transfers the energy stored in C1 to C0 through the resonant cavity. A voltage conversion with a ratio of 8 - 1 from 48V to 6V can be achieved.

[0055] Embodiment 4, as Figure 7 shown, a 2 - 1 power conversion topology of a multiphase switched - capacitor resonant cavity conversion circuit with full - wave output rectification, includes 1 switching capacitor C1 and 1 output switching capacitor C0 that are connected in series in sequence through wires and connected to both ends of the input power supply; the lower end of the output switching capacitor C0 is grounded, and an output interface is connected to both ends of the output switching capacitor CO; it also includes 1 switching resonant cavity converter L1

[0056] The switched resonant cavity converter L1 includes an input component, an output component, and a connection component connecting the two. The input component includes a first MOSFET switch and a second MOSFET switch connected in series by a wire. The output component includes a third MOSFET switch and a fourth MOSFET switch connected in series by a wire. The connection component includes a resonant capacitor and a resonant inductor connected in series by a wire. One end of the connection component close to the resonant capacitor is connected to the wire between the first MOSFET switch and the second MOSFET switch, and the other end of the connection component is connected to the wire between the third MOSFET switch and the fourth MOSFET switch; a first signal input terminal is respectively provided on the first MOSFET switch and the third MOSFET switch; a second signal input terminal is respectively provided on the second MOSFET switch and the fourth MOSFET switch; the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all zero-current switches. The first MOSFET switch and the third MOSFET switch are turned on and off at the same time, and the second MOSFET switch and the fourth MOSFET switch are turned on and off at the same time; and the quality factor Q of the switched resonant cavity converter L1 satisfies: 0.1 ≤ Q ≤ 10;

[0057] In the switched resonant cavity converter Lj (j is 1), there is a dead time between each switching event, that is, the time when both the first signal input terminal and the second signal input terminal are closed, and the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all in the on state.

[0058] The capacitance value of the conversion switch capacitor is one order of magnitude higher than that of the resonant capacitor. The capacitance value of the output switch capacitor is one order of magnitude higher than that of the resonant capacitor.

[0059] The first MOSFET switch and the second MOSFET switch of the input component of the switched resonant cavity converter L1 are respectively connected to both ends of the conversion switch capacitor C1. The fourth MOSFET switch of the output component of the switched resonant cavity converter L1 is connected to the lower end of the output switch capacitor C0, and the third MOSFET switch of the output component of the switched resonant cavity converter L1 is connected to the upper end of the output switch capacitor C0.

[0060] In the initial operation stage, the input voltage is equivalently divided into two parts and stored in the conversion switch capacitor C1 and the output switch capacitor C0 respectively. The energy stored in C1 by the switched resonant cavity converter L1 will be transmitted to C0 through the resonant cavity. Finally, a voltage conversion with a ratio of 2-1 from 48V to 24V can be achieved.

[0061] Such as Figure 8As shown, when the power transmission requirement exceeds the power transmission capacity of a single-phase power conversion topology SCTC of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification, a power conversion structure can be used, including N parallel-connected power conversion topologies SCTC of the above-described multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification. The parallel power conversion topology SCTC architecture of the multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification can also be extended to various applications that require a high voltage conversion ratio but do not require current isolation.

[0062] As Figure 9 As shown, a power conversion structure includes a series-connected power conversion component and a point-of-load conversion component. The power conversion component includes a plurality of parallel-connected power conversion topologies SCTC of the above-described multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification, and the point-of-load conversion component includes a plurality of parallel-connected point-of-load converters PoL. The power conversion topology SCTC of the multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification receives an input voltage and reduces the voltage to an intermediate bus voltage. Then each point-of-load converter PoL receives the intermediate bus voltage as an input and generates a corresponding regulated output Vout, whose voltage value depends on the voltage requirement of the load.

[0063] The above embodiments are only illustrative of the principles and effects of the present invention and some applied embodiments, and are not intended to limit the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.

Claims

1. A power conversion topology of a multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification, characterized in that: It includes at least k switching capacitor banks connected in series through wires and connected to both ends of the input power supply in sequence, and an output switching capacitor bank. When the turns ratio N is an even number, k = N / 2; when the turns ratio N is an odd number, k is the smallest integer greater than N / 2. The lower end of the output switching capacitor bank is grounded, and an output interface is connected between the two ends of the output switching capacitor bank. It also includes k switching resonant cavity converters. When the turns ratio N is an even number, k = N / 2; when the turns ratio N is an odd number, k is the smallest integer greater than N / 2. The switching resonant cavity converter includes an input component, an output component, and a connection component connecting the two. The input component includes a first MOSFET switch and a second MOSFET switch connected in series through a wire. The output component includes a third MOSFET switch and a fourth MOSFET switch connected in series through a wire. The connection component includes a resonant capacitor and a resonant inductor connected in series through a wire. One end of the connection component close to the resonant capacitor is connected to the wire between the first MOSFET switch and the second MOSFET switch, and the other end of the connection component is connected to the wire between the third MOSFET switch and the fourth MOSFET switch. A first signal input terminal is respectively provided on the first MOSFET switch and the third MOSFET switch. A second signal input terminal is respectively provided on the second MOSFET switch and the fourth MOSFET switch. The first MOSFET switch and the third MOSFET switch are turned on and off at the same time, and the second MOSFET switch and the fourth MOSFET switch are turned on and off at the same time. And the quality factor Q of the switching resonant cavity converter satisfies: 0.1 ≤ Q ≤ 10. The first MOSFET switch and the second MOSFET switch of the input component of each switching resonant cavity converter are respectively connected to both ends of the corresponding switching capacitor bank. The fourth MOSFET switch of the output component of each switching resonant cavity converter is connected to the lower end of the output switching capacitor bank. The third MOSFET switch of the output component of at least one switching resonant cavity converter is connected to the upper end of any other switching capacitor bank on the side of the corresponding switching capacitor bank of this switching resonant cavity converter close to the output switching capacitor bank. The third MOSFET switch of the output component of each of the remaining switching resonant cavity converters is connected to the upper end of the output switching capacitor bank or the upper end of any other switching capacitor bank on the side of the corresponding switching capacitor bank of this switching resonant cavity converter close to the output switching capacitor bank.

2. The power conversion topology of the multiphase switched capacitor resonant cavity conversion circuit with full-wave output rectification as claimed in claim 1, characterized in that: There is a dead time between each switching event in the switching resonant cavity converter, that is, the time when both the first signal input terminal and the second signal input terminal are closed, and the first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all in the open state.

3. The power conversion topology of the polyphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification as claimed in claim 2, wherein: The first MOSFET switch, the second MOSFET switch, the third MOSFET switch, and the fourth MOSFET switch are all zero-current switches.

4. The power conversion topology of the multiphase switched-capacitor resonant cavity conversion circuit with full-wave output rectification according to any one of claims 1-3, characterized in that: The capacitance value of the switching capacitor bank is one order of magnitude higher than the capacitance value of the resonant capacitor.

5. The power conversion topology of the multiphase switched capacitor resonant cavity conversion circuit with full-wave output rectification as described in any one of claims 1 to 3, characterized in that: The capacitance value of the output switched capacitor is one order of magnitude higher than that of the resonant capacitor.

6. A power conversion structure, characterized in that: A power conversion topology including at least two polyphase switched-capacitor resonant cavity conversion circuits with full-wave output rectification as described in any one of claims 1-5 and arranged in parallel.

7. A power conversion structure, characterized in that: Including at least two voltage conversion components connected in series, each voltage conversion component including one or more power conversion topologies of polyphase switched-capacitor resonant cavity conversion circuits with full-wave output rectification as described in any one of claims 1-5 and arranged in parallel.

8. A power conversion structure, characterized in that: Comprising a power conversion component and a point-of-load conversion component connected in series. The power conversion component includes a plurality of power conversion topologies of polyphase switched-capacitor resonant cavity conversion circuits with full-wave output rectification as described in any one of claims 1-5 and arranged in parallel. The point-of-load conversion component includes a plurality of point-of-load converters arranged in parallel.

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