Institute of Applied Electronics

Mianyang, China

Institute of Applied Electronics

Mianyang, China
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Rui H.,Institute of Applied Electronics
Agro Food Industry Hi-Tech | Year: 2017

The principle based on Buck DC-DC converter, starting from the requirements of the system, a high performance error amplifier is proposed. The input of the error amplifier uses bias current cancellation structure, avoiding the influence of the input on the reference voltage; the core circuit adopts symmetrical differential amplifier structure, introducing the structure of positive feedback and negative feedback resistor to improve its performance, and the circuit structure adopts CSMC 0.5 μm BCD technology. The simulation results show that the trans conductance of the error amplifier is 1.5 mS, the lower limit of common mode can start from 0, the CMRR is 106 dB, the offset voltage is 208.3 μV, and the power consumption is about 100 μW, validating the good performance of amplifier.

Wang X.,Institute of Applied Electronics
Agro Food Industry Hi-Tech | Year: 2017

To improving the control performance of brushless DC motor, the paper designs the motor control system with Digital Signal Processor (DSP) and TMS320F2812 as the cores. To reasonably design the control system, the paper, first, presents the double-closed control system tailored for brushless DC motor based on analyzing its control principles, and finishes the system design from the two aspects of hardware and software. Then, it carries out the modeling and simulation experiments on the control system through MATLAB, and analyzes the changes of simulation waveform in the cases of freeload and on-load. The findings verify that the speed control system is of high practical value for the advantages such as stable and quick startup, outstanding speed control performance, and high control precision, thus.

Chen X.,Institute of Applied Electronics
Agro Food Industry Hi-Tech | Year: 2017

An efficient energy collection system is proposed, which is suitable for the expansion of the input source of the battery, and the control algorithm is designed. The energy collection circuit is mainly composed of a digital control unit (DCU), comparator, based on Dickson charge pump clock doubler voltage regulator (CVD) and analog switch, can be of a plurality of independent energy harvester (EH) electric energy collection. The system supports the expansion of any number of EH by hot swap. The proposed control algorithm can transfer the energy from each EH to the energy storage device and not interfere with each other. The proposed circuit is realized by using 0.18μm CMOS technology. Experimental results show that, compared to a similar energy harvesting system, the energy harvesting system is the minimum power consumption which is only 1.72μW, can provide up to three of the maximum energy collection efficiency for 96.1% input sources.

Xuechang C.,Institute of Applied Electronics
International Journal of Simulation: Systems, Science and Technology | Year: 2016

A motion controller is the core of industrial robots, and its strengths and weaknesses directly affect the accuracy and performance of their motion. Current industrial robot controllers mostly adopt the universal motion controller. Their real-time performance is not high, the motion control algorithm is very simple and does not offer opportunities for development. The interface is simple, unable to meet the requirements of industrial robots with complex motion control systems. In order to meet the real-time requirement of robot motion, a controller using FPGA is studied, and the system structure features, hardware circuit design and the main module of the controller are analyzed. The results show the controller can achieve reliable motion control of the robot. © 2017, UK Simulation Society. All rights reserved.

Huo F.,Institute of Applied Electronics
Chemical Engineering Transactions | Year: 2017

In the millimeter wave wireless communication system, frequency source is an indispensable device in the communication equipment. It is designed to provide a local oscillator signal for the receiving and transmitting system. Its tuning range, phase noise and frequency stability are very important to the quality of the whole communication link. For this purpose, this paper studies the low power millimeter wave voltage controlled oscillator based on CMOS technology, and designs a Q band voltage controlled oscillator used for Q-LINKPAN standard. Firstly, this paper designs the voltage controlled oscillator (VCO) circuit structure, the voltage controlled oscillator circuit, cross coupled pair, on-chip inductor and variable capacitance tube, and studies the connection layout method to reduce the layout parasitic, summarizes the method of imitation of the VCO after using the electromagnetic simulation software HFSS, accumulates certain design experience for the circuit design, layout design and post simulation of millimeter wave VCO, and gives the simulation results for Q band voltage controlled oscillator used for Q-LINKPAN standard. The simulation results show that the designed voltage controlled oscillator has low power consumption and high performance, showing the correctness of the design. Copyright © 2017, AIDIC Servizi S.r.l.

Liu C.,Zhejiang University | Zhao Z.,Zhejiang University | Chen J.,Zhejiang University | Tong L.,Institute of Applied Electronics | And 3 more authors.
Optics Communications | Year: 2011

A large aperture tapered fused silica fiber phase conjugate mirror with a maximum 50.7% stimulated Brillouin scattering (SBS) reflectivity is presented, which is operated with 400 Hz pulse repetition rate and 36.5 mJ input pulse energy. To the best of our knowledge, it is the first time that over 50% SBS reflectivity is achieved by using solid-state phase conjugate mirror under such high pulse repetition rate and high pulse energy. With much higher pulse repetition rate of 500 and 1000 Hz, the maximum SBS reflectivity is 41.2% and 33.3%, respectively. A single-longitudinal-mode Nd:YAG laser is experimentally studied with master oscillator power amplifier (MOPA) scheme using such a tapered fiber as a phase conjugate mirror. A 101 mJ pulse energy is achieved at 400 Hz repetition rate, with a pulse width of 6 ns and a M2 factor of less than 2. The corresponding peak power reaches 16.8 MW. © 2010 Elsevier B.V. All rights reserved.

Yu C.,Institute of Applied Electronics | Chen X.,Institute of Applied Electronics | Xue C.,Institute of Applied Electronics | Meng F.,Institute of Applied Electronics
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2010

The near field properties of circular aperture antennas with Gaussian amplitude distribution are analyzed by the aperture field integration method in this paper. The axial near field and gain expressions of the unfocused and focused circular aperture antennas are deduced. The near-axis field distribution of circular aperture antennas is obtained by numeric integration method. The analysis shows that for the circular aperture antennas with Gaussian amplitude distribution, axial near field varies in an oscillatory manner and the near-field gain is related to both aperture distribution and the distance from the antenna. The near-field gain in the focus can achieve the gain in far field and the field intensity near the focus can be enhanced greatly through aperture focusing.

Xia X.,Institute of Applied Electronics
Open Automation and Control Systems Journal | Year: 2015

Aiming at QPSK modulation digital system with variable rate, a novel implementation method based on field programmable gate array (FPGA) is proposed, which can support 4.88Kbps to 2Mbps and even higher continuous bit rate. The design adopts mixed multiplier, numerically controlled oscillator (NCO) and integral comb filter (CIC), and describes the structure of carrier recovery circuit and signal recovery circuit, which can be ported to any FPGA device. The proposed design has its hardware test in the Xilinx Virtex-5 FPGA platform. The hardware test results show that the proposed demodulator only takes up 15% available logical unit of Xilinx Virtex-5 FPGA device, revealing superior ability in efficiency. © Xiquan Xia.

Tong L.,Institute of Applied Electronics | Zhao Z.,Zhejiang University | Cui L.,Institute of Applied Electronics | Liu C.,Zhejiang University | And 3 more authors.
Laser Physics | Year: 2011

An all solid state master-oscillator-power-amplifier laser system was experimentally investigated using a pulsed-diode-pumped single-longitudinal-mode Nd:YAG laser as a master oscillator. The system was operated with 400 Hz pulse repetition rate. The amplifiers contain a pre-amplifier and a power amplifier. A specially designed large aperture tapered fiber as a solid state phase conjugation mirror was used in the power amplifier to improve the beam quality. The maximum pulse energy of 101 mJ is obtained after double-pass amplification. The pulse duration is less than 6 ns. The corresponding peak power reached 16.8 MW for each single pulse. © 2011 Pleiades Publishing, Ltd.

Zhao Z.,Zhejiang University | Dong Y.,Zhejiang University | Pan S.,Zhejiang University | Liu C.,Zhejiang University | And 4 more authors.
Optics Express | Year: 2012

A large aperture fused silica tapered fiber phase conjugate mirror is presented with a maximum 70% stimulated Brillouin scattering (SBS) reflectivity, which is obtained with 1 kHz repetition rate, 15 ns pulse width and 38 mJ input pulse energy. To the best of our knowledge, this is the highest SBS reflectivity ever reported by using optical fiber as a phase conjugate mirror for such high pulse repetition rate (1 kHz) and several tens of millijoule (mJ) input pulse energy. The influences of fiber end surface quality and pump pulse widths on SBS reflectivity are investigated experimentally. The results show that finer fiber end surface quality and longer input pulse widths are preferred for obtaining higher SBS reflectivity with higher input pulse energy. Double passing amplification experiments are also performed. 52 mJ pulse energy is achieved at 1 kHz repetition rate, with a reflected SBS pulse width of 1.5 ns and a M2 factor of 2.3. The corresponding peak power reaches 34.6 MW. Obvious beam quality improvement is observed. © 2012 Optical Society of America.

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