In the process of spectrum perception,in order to realize accurate perception of the channel state,the method of multi-node cooperative perception can usually be used.However,the first problem to be considered is how ...In the process of spectrum perception,in order to realize accurate perception of the channel state,the method of multi-node cooperative perception can usually be used.However,the first problem to be considered is how to complete information fusion and obtain more accurate and reliable judgment results based on multi-node perception results.The ideas put forward in this paper are as follows:firstly,the perceived results of each node are obtained on the premise of limiting detection probability and false alarm probability.Then,on the one hand,the weighted fusion criterion of decision-making weight optimization of each node is realized based on a genetic algorithm,and the useless nodes also can be screened out to reduce energy loss;on the other hand,through the linear fitting ability of RBF neural network,the self-inspection of the perceptive nodes can be realized to ensure the normal operation of the perceptive work of each node.What's more,the real-time training data can be obtained by spectral segmentation technology to ensure the real-time accuracy of the optimization results.Finally,the simulation results show that this method can effectively improve the accuracy and stability of channel perception results,optimize the structure of the cooperative network and reduce energy consumption.展开更多
An on-chip power-on reset circuit with a brown-out detection capability is implemented in a 0. 18 μm CMOS. A pF-order capacitor is charged with a proportional-to-absolute-temperature （PTAT） current from a bandgap r...An on-chip power-on reset circuit with a brown-out detection capability is implemented in a 0. 18 μm CMOS. A pF-order capacitor is charged with a proportional-to-absolute-temperature （PTAT） current from a bandgap reference with limited loop bandwidth and slow start-up feature, to generate a reset signal with high robustness and wide-range supply rise time. An embedded brown- out detector based on complementary voltage-to-current （V-to-I） conversion and current comparison can accurately respond to the brown-out event with high robustness over process and temperature when the supply is lower than 1.5 V and the brown-out duration is longer than 0. 1 ms. The presented design with embedded offset voltage cancellation consumes a quiescent current of 8. 5 μA from a 1. 8 V supply and works over ambient temperature of -40° to 120°.展开更多
Single event latch-up (SEL) is a significant issue for electronics design in space application, which would cause large currents in electronic devices, and may lead to burning out of devices. A new monitoring circuit ...Single event latch-up (SEL) is a significant issue for electronics design in space application, which would cause large currents in electronic devices, and may lead to burning out of devices. A new monitoring circuit based on current-comparing method is designed to protect the electronics away from SEL’s damage in radiation environment. The response time of protection circuit has been analyzed. The signal simulation results indicated that the operating time of the SEL protection circuit is dependent on the action time of current comparator and system application recovery time. The function of the monitoring circuit protection device away from SEL’s damage has validated through experiment at last.展开更多
A non-intrusive design of self-checking finite state machines (FSMs) in VLSI circuits was investigated using convolutional codes. We propose a novel scheme which cannot only detect but also correct errors occurred in ...A non-intrusive design of self-checking finite state machines (FSMs) in VLSI circuits was investigated using convolutional codes. We propose a novel scheme which cannot only detect but also correct errors occurred in FSM states. The error state will be corrected and sent back to the FSM, so that the concurrent error in the current state is detected and corrected immediately. Moreover, we realize the IP core of the self-checking module by SMIC 0.25-μm CMOS technology and also simulate its function in FPGA.展开更多
Fault-tolerant data transmission models based on the redundant residue number system are proposed in this paper; they can transmit data correctly between two ends unless the residue errors exceed the error-correction ...Fault-tolerant data transmission models based on the redundant residue number system are proposed in this paper; they can transmit data correctly between two ends unless the residue errors exceed the error-correction capability. The expressions for the probability of error are presented when the channel noise is additive Gaussian noise and each branch is M-ary orthogonal signaling modulation. The expressions of the probabilities of undetected and uncorrected error are also obtained when the redundant residue number system are single error-checking and single error-correcting model, respectively.展开更多
During the shifting process of hybrid transmission,the motor plays an important role due to its fast response and accurate torque control.However,it also leads to an excessive reliance on the motor,while neglecting th...During the shifting process of hybrid transmission,the motor plays an important role due to its fast response and accurate torque control.However,it also leads to an excessive reliance on the motor,while neglecting the collaborative control of the motor and clutch.Therefore,there is still room for further improvement in the shifting quality of the hybrid system.In addition,the changing motor torque can easily cause a certain shifting impact at the moment of the clutch state transition,especially for the transition from sliding state to engaged state.In the meanwhile,due to the presence of multiple power sources,the influence of acceleration on the shifting process cannot be ignored.For these problems,this paper proposes a power-on upshifting control strategy for a two-speed series-parallel hybrid transmission,and the root cause of the shifting impact when the clutch slip is eliminated is analyzed.On this basis,a motor torque control method is proposed that is easily to be implemented in engineering,that is,when the target slip is reduced to the threshold Δω_(1),set the motor proportionalintegral(PI)controller output to zero to ensure that the motor output torque can be changed to zero when the clutch slip is eliminated so that the shifting impact here can be suppressed.Then the factors that affect the value setting of Δω_(1) are analyzed based on the dynamics model and verified by simulation and hardware-in-loop(HIL)test based on the control variable method.In addition,the influence of acceleration on the shifting process is analyzed,and corresponding control strategies are proposed to improve the shifting quality.Finally,the Worldwide Harmonized Light Vehicles Test Cycle(WLTC)test is conducted on the vehicle model to compare the shifting control effects under different working conditions,which can verify the proposed effectiveness of the control strategy.展开更多
According to the parameters and applications of laser diode （LD）, three protection circuits were designed： the time-delay soft-start protection circuit, the power-on impulse protection circuit and the limit-current...According to the parameters and applications of laser diode （LD）, three protection circuits were designed： the time-delay soft-start protection circuit, the power-on impulse protection circuit and the limit-current protection circuit. In this article, the structure and the principle of every protection circuit have been detailed. From several tests and feedbacks from customers, the expected goals have been completed.展开更多
文摘In the process of spectrum perception,in order to realize accurate perception of the channel state,the method of multi-node cooperative perception can usually be used.However,the first problem to be considered is how to complete information fusion and obtain more accurate and reliable judgment results based on multi-node perception results.The ideas put forward in this paper are as follows:firstly,the perceived results of each node are obtained on the premise of limiting detection probability and false alarm probability.Then,on the one hand,the weighted fusion criterion of decision-making weight optimization of each node is realized based on a genetic algorithm,and the useless nodes also can be screened out to reduce energy loss;on the other hand,through the linear fitting ability of RBF neural network,the self-inspection of the perceptive nodes can be realized to ensure the normal operation of the perceptive work of each node.What's more,the real-time training data can be obtained by spectral segmentation technology to ensure the real-time accuracy of the optimization results.Finally,the simulation results show that this method can effectively improve the accuracy and stability of channel perception results,optimize the structure of the cooperative network and reduce energy consumption.
基金Supported by the National Natural Science Foundation of China(6130603761201182)
文摘An on-chip power-on reset circuit with a brown-out detection capability is implemented in a 0. 18 μm CMOS. A pF-order capacitor is charged with a proportional-to-absolute-temperature （PTAT） current from a bandgap reference with limited loop bandwidth and slow start-up feature, to generate a reset signal with high robustness and wide-range supply rise time. An embedded brown- out detector based on complementary voltage-to-current （V-to-I） conversion and current comparison can accurately respond to the brown-out event with high robustness over process and temperature when the supply is lower than 1.5 V and the brown-out duration is longer than 0. 1 ms. The presented design with embedded offset voltage cancellation consumes a quiescent current of 8. 5 μA from a 1. 8 V supply and works over ambient temperature of -40° to 120°.
文摘Single event latch-up (SEL) is a significant issue for electronics design in space application, which would cause large currents in electronic devices, and may lead to burning out of devices. A new monitoring circuit based on current-comparing method is designed to protect the electronics away from SEL’s damage in radiation environment. The response time of protection circuit has been analyzed. The signal simulation results indicated that the operating time of the SEL protection circuit is dependent on the action time of current comparator and system application recovery time. The function of the monitoring circuit protection device away from SEL’s damage has validated through experiment at last.
基金the National Natural Science Foundation of China (No. 60473033)the Shanghai Leading Academic Discipline Project (No. T0103).
文摘A non-intrusive design of self-checking finite state machines (FSMs) in VLSI circuits was investigated using convolutional codes. We propose a novel scheme which cannot only detect but also correct errors occurred in FSM states. The error state will be corrected and sent back to the FSM, so that the concurrent error in the current state is detected and corrected immediately. Moreover, we realize the IP core of the self-checking module by SMIC 0.25-μm CMOS technology and also simulate its function in FPGA.
基金Supported by the National Natural Science Foundation of China
文摘Fault-tolerant data transmission models based on the redundant residue number system are proposed in this paper; they can transmit data correctly between two ends unless the residue errors exceed the error-correction capability. The expressions for the probability of error are presented when the channel noise is additive Gaussian noise and each branch is M-ary orthogonal signaling modulation. The expressions of the probabilities of undetected and uncorrected error are also obtained when the redundant residue number system are single error-checking and single error-correcting model, respectively.
基金financially supported by National Natural Science Foundation of China(Grant Number:52172352,52322216)Beijing Natural Science Foundation(Grant Number:L233039)+4 种基金Ningbo Natural Science Foundation(Grant No.2023J052)“Pioneer”and“Leading Goose”R&D Program of Zhejiang(Grant No.2023C01133)Key R&D Program of Ningbo(Grant No.2023Z014)the support of Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Resource Vehiclethe support of the Fundamental Research Funds for the Central Universities.
文摘During the shifting process of hybrid transmission,the motor plays an important role due to its fast response and accurate torque control.However,it also leads to an excessive reliance on the motor,while neglecting the collaborative control of the motor and clutch.Therefore,there is still room for further improvement in the shifting quality of the hybrid system.In addition,the changing motor torque can easily cause a certain shifting impact at the moment of the clutch state transition,especially for the transition from sliding state to engaged state.In the meanwhile,due to the presence of multiple power sources,the influence of acceleration on the shifting process cannot be ignored.For these problems,this paper proposes a power-on upshifting control strategy for a two-speed series-parallel hybrid transmission,and the root cause of the shifting impact when the clutch slip is eliminated is analyzed.On this basis,a motor torque control method is proposed that is easily to be implemented in engineering,that is,when the target slip is reduced to the threshold Δω_(1),set the motor proportionalintegral(PI)controller output to zero to ensure that the motor output torque can be changed to zero when the clutch slip is eliminated so that the shifting impact here can be suppressed.Then the factors that affect the value setting of Δω_(1) are analyzed based on the dynamics model and verified by simulation and hardware-in-loop(HIL)test based on the control variable method.In addition,the influence of acceleration on the shifting process is analyzed,and corresponding control strategies are proposed to improve the shifting quality.Finally,the Worldwide Harmonized Light Vehicles Test Cycle(WLTC)test is conducted on the vehicle model to compare the shifting control effects under different working conditions,which can verify the proposed effectiveness of the control strategy.
基金the National Natural Science Foundation of China （60372061）.
文摘According to the parameters and applications of laser diode （LD）, three protection circuits were designed： the time-delay soft-start protection circuit, the power-on impulse protection circuit and the limit-current protection circuit. In this article, the structure and the principle of every protection circuit have been detailed. From several tests and feedbacks from customers, the expected goals have been completed.
