With the rapid scaling of superconducting quantum processors,electronic control systems relying on commercial off-the-shelf instruments face critical bottlenecks in signal density,power consumption,and crosstalk mitig...With the rapid scaling of superconducting quantum processors,electronic control systems relying on commercial off-the-shelf instruments face critical bottlenecks in signal density,power consumption,and crosstalk mitigation.Here we present a custom dual-channel direct current(DC)source module(QPower)dedicated to large-scale superconducting quantum processors.The module delivers a voltage range of±7 V with 200 m A maximum current per channel,while achieving the following key performance benchmarks:noise spectral density of√Hz at 10 k Hz,output ripple<500μV_(pp)within 20 MHz bandwidth,and long-term voltage drift<5μVpp over 12 hours.Integrated into the control electronics of a 66-qubit quantum processor,QPower enables qubit coherence time of T_(1)=87.6μs and Ramsey dephasing time of T_(2)=5.1μs,with qubit resonance frequency drift constrained to±40 k Hz during 12-hour operation.This modular design is compact in size and efficient in energy consumption,providing a scalable DC source solution for intermediate-scale quantum processors with stringent noise and stability requirements,with potential extensions to other quantum hardware platforms and precision measurement systems.展开更多
Multilevel inverter has become increasingly popular in recent years due to advantages of high power quality waveforms, low switching losses, and high-voltage capability. A novel multilevel inverter with minimum number...Multilevel inverter has become increasingly popular in recent years due to advantages of high power quality waveforms, low switching losses, and high-voltage capability. A novel multilevel inverter with minimum number of separated DC sources is presented in this paper. Three-phase output voltages of this inverter can easily be balanced because they are synthesized by using the same DC sources. A harmonic reduction method eliminating both the 5th and 7th harmonics is proposed. Finally, comparison results and spectral analysis are presented. Key words multilevel inverter - topology - DC source - harmonic reduction - spectrum Project supported by the Postdoctoral Science Foundation of Shanghai (Grant No. kO7)展开更多
3.SWITCHING ANGLES If the nominal capacitor voltage is chosen as Vdc/2, then one can compute the switching anglesθ1,θ2,andθ3.Following the development,the Fourier series expan- sion of the(staircase)output voltage ...3.SWITCHING ANGLES If the nominal capacitor voltage is chosen as Vdc/2, then one can compute the switching anglesθ1,θ2,andθ3.Following the development,the Fourier series expan- sion of the(staircase)output voltage waveform of the multilevel inverter as shown in Fig.2(a)展开更多
In this paper,a new generalized step-up multilevel DC-AC converter is proposed,which is suitable for applications with low-voltage input sources,such as photovoltaic power generation and electric vehicles.This inverte...In this paper,a new generalized step-up multilevel DC-AC converter is proposed,which is suitable for applications with low-voltage input sources,such as photovoltaic power generation and electric vehicles.This inverter can achieve a high voltage gain by controlling the series-parallel conversion of the DC power supply and capacitors.Only one DC voltage source and a few power devices are employed.The maximum output voltage and the number of output levels can be further increased through the switched-capacitor unit’s extension and the submodule cascaded extension.Moreover,the capacitor voltages are self-balanced without complicated voltage control circuits.The complementary operating mechanism between each pair of switches simplifies the modulation algorithm.The inductiveload ability is fully taken into account in the proposed inverter.Additionally,a remarkable characteristic of the inverter is that the charging and discharging states among different capacitors are synchronous,which reduces the voltage ripple of the frontend capacitors.The circuit structure,the working principle,the modulation strategy,the capacitors and losses analysis are presented in detail.Afterwards,the advantages of the proposed inverter are analyzed by comparing with other recently proposed inverters.Finally,the steady-state and dynamic performance of the proposed inverter is verified and validated by simulation and experiment.展开更多
Separation and recognition of radar signals is the key function of modern radar reconnaissance,which is of great sig-nificance for electronic countermeasures and anti-countermea-sures.In order to improve the ability o...Separation and recognition of radar signals is the key function of modern radar reconnaissance,which is of great sig-nificance for electronic countermeasures and anti-countermea-sures.In order to improve the ability of separating mixed signals in complex electromagnetic environment,a blind source separa-tion algorithm based on degree of cyclostationarity(DCS)crite-rion is constructed in this paper.Firstly,the DCS criterion is con-structed by using the cyclic spectrum theory.Then the algo-rithm flow of blind source separation is designed based on DCS criterion.At the same time,Givens matrix is constructed to make the blind source separation algorithm suitable for multiple sig-nals with different cyclostationary frequencies.The feasibility of this method is further proved.The theoretical and simulation results show that the algorithm can effectively separate and re-cognize common multi-radar signals.展开更多
In this paper, a Binary Coded Decimal (BCD) topology of modular multilevel inverter with reduced component count is proposed. For the control of this inverter, hybrid control strategy is used. The proposed modular mul...In this paper, a Binary Coded Decimal (BCD) topology of modular multilevel inverter with reduced component count is proposed. For the control of this inverter, hybrid control strategy is used. The proposed modular multilevel inverter uses asymmetrical dc sources and reduced number of switches topology. This hybrid modulation technique uses the multicarrier based Pulse Width Modulation (PWM) and the fundamental frequency modulation strategy. The hybrid modulation algorithm is implemented with “NUC140” micro-controller. In comparison with the conventional and some of the recently reported inverter topologies, the proposed inverter topology is able to generate high number of voltage levels in the output by using minimum number of components such as dc sources, power switches and driver circuits. This inverter offers significant performance with less number of components. The feasibility of the proposed topology is confirmed by simulation and experimental results.展开更多
A DC hybrid power source composed of photovoltaic cells as the main power source,Li-ion battery storage as the secondary power source,and power electronic interface,is modeled based on port-controlled Hamiltonian syst...A DC hybrid power source composed of photovoltaic cells as the main power source,Li-ion battery storage as the secondary power source,and power electronic interface,is modeled based on port-controlled Hamiltonian systems and Euler-Lagrange framework.Subsequently,passivity-based controllers are synthesized.Local asymptotic stability is ensured as well.In addition,a power management system is designed to manage power flow between components.Modeling and simulation of the proposed hybrid power source is accomplished using MATLAB/Simulink.Our interest is focused on the comparison of the two passivity-based control methods and their use in hybrid power systems.展开更多
基金Project supported by the Science,Technology and Innovation Commission of Shenzhen Municipality(Grant No.KQTD20210811090049034)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0301703)。
文摘With the rapid scaling of superconducting quantum processors,electronic control systems relying on commercial off-the-shelf instruments face critical bottlenecks in signal density,power consumption,and crosstalk mitigation.Here we present a custom dual-channel direct current(DC)source module(QPower)dedicated to large-scale superconducting quantum processors.The module delivers a voltage range of±7 V with 200 m A maximum current per channel,while achieving the following key performance benchmarks:noise spectral density of√Hz at 10 k Hz,output ripple<500μV_(pp)within 20 MHz bandwidth,and long-term voltage drift<5μVpp over 12 hours.Integrated into the control electronics of a 66-qubit quantum processor,QPower enables qubit coherence time of T_(1)=87.6μs and Ramsey dephasing time of T_(2)=5.1μs,with qubit resonance frequency drift constrained to±40 k Hz during 12-hour operation.This modular design is compact in size and efficient in energy consumption,providing a scalable DC source solution for intermediate-scale quantum processors with stringent noise and stability requirements,with potential extensions to other quantum hardware platforms and precision measurement systems.
文摘Multilevel inverter has become increasingly popular in recent years due to advantages of high power quality waveforms, low switching losses, and high-voltage capability. A novel multilevel inverter with minimum number of separated DC sources is presented in this paper. Three-phase output voltages of this inverter can easily be balanced because they are synthesized by using the same DC sources. A harmonic reduction method eliminating both the 5th and 7th harmonics is proposed. Finally, comparison results and spectral analysis are presented. Key words multilevel inverter - topology - DC source - harmonic reduction - spectrum Project supported by the Postdoctoral Science Foundation of Shanghai (Grant No. kO7)
文摘3.SWITCHING ANGLES If the nominal capacitor voltage is chosen as Vdc/2, then one can compute the switching anglesθ1,θ2,andθ3.Following the development,the Fourier series expan- sion of the(staircase)output voltage waveform of the multilevel inverter as shown in Fig.2(a)
基金This work was supported in part by the National Natural Science Foundation of China under Grant 51507155in part by the Youth key Teacher Project of Henan Higher Educational Institutions under Grant 2019GGJS011.
文摘In this paper,a new generalized step-up multilevel DC-AC converter is proposed,which is suitable for applications with low-voltage input sources,such as photovoltaic power generation and electric vehicles.This inverter can achieve a high voltage gain by controlling the series-parallel conversion of the DC power supply and capacitors.Only one DC voltage source and a few power devices are employed.The maximum output voltage and the number of output levels can be further increased through the switched-capacitor unit’s extension and the submodule cascaded extension.Moreover,the capacitor voltages are self-balanced without complicated voltage control circuits.The complementary operating mechanism between each pair of switches simplifies the modulation algorithm.The inductiveload ability is fully taken into account in the proposed inverter.Additionally,a remarkable characteristic of the inverter is that the charging and discharging states among different capacitors are synchronous,which reduces the voltage ripple of the frontend capacitors.The circuit structure,the working principle,the modulation strategy,the capacitors and losses analysis are presented in detail.Afterwards,the advantages of the proposed inverter are analyzed by comparing with other recently proposed inverters.Finally,the steady-state and dynamic performance of the proposed inverter is verified and validated by simulation and experiment.
基金supported by the National Natural Science Foundation of China(61502522).
文摘Separation and recognition of radar signals is the key function of modern radar reconnaissance,which is of great sig-nificance for electronic countermeasures and anti-countermea-sures.In order to improve the ability of separating mixed signals in complex electromagnetic environment,a blind source separa-tion algorithm based on degree of cyclostationarity(DCS)crite-rion is constructed in this paper.Firstly,the DCS criterion is con-structed by using the cyclic spectrum theory.Then the algo-rithm flow of blind source separation is designed based on DCS criterion.At the same time,Givens matrix is constructed to make the blind source separation algorithm suitable for multiple sig-nals with different cyclostationary frequencies.The feasibility of this method is further proved.The theoretical and simulation results show that the algorithm can effectively separate and re-cognize common multi-radar signals.
文摘In this paper, a Binary Coded Decimal (BCD) topology of modular multilevel inverter with reduced component count is proposed. For the control of this inverter, hybrid control strategy is used. The proposed modular multilevel inverter uses asymmetrical dc sources and reduced number of switches topology. This hybrid modulation technique uses the multicarrier based Pulse Width Modulation (PWM) and the fundamental frequency modulation strategy. The hybrid modulation algorithm is implemented with “NUC140” micro-controller. In comparison with the conventional and some of the recently reported inverter topologies, the proposed inverter topology is able to generate high number of voltage levels in the output by using minimum number of components such as dc sources, power switches and driver circuits. This inverter offers significant performance with less number of components. The feasibility of the proposed topology is confirmed by simulation and experimental results.
基金supported by Iran University of Science and Technology,Iran
文摘A DC hybrid power source composed of photovoltaic cells as the main power source,Li-ion battery storage as the secondary power source,and power electronic interface,is modeled based on port-controlled Hamiltonian systems and Euler-Lagrange framework.Subsequently,passivity-based controllers are synthesized.Local asymptotic stability is ensured as well.In addition,a power management system is designed to manage power flow between components.Modeling and simulation of the proposed hybrid power source is accomplished using MATLAB/Simulink.Our interest is focused on the comparison of the two passivity-based control methods and their use in hybrid power systems.
