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In this paper, very low loss and high isolation single pole double throw (SPDT) switch design for millimeter wave applications using pseudomorphic high-electron mobility transistor (pHEMT) is presented. The MMIC switch design is developed using a commercial 0.15 mum GaAs pHEMT technology. At the operating frequency of 30 GHz, the SPDT switch has 1.948 dB insertion loss and 24.526 dB of isolation....
This paper introduces an optimized sync switching method of spring operating mechanism based vacuum circuit breaker (VCB), and the development of an actual control system using TI 2812 DSP. This optimized method could efficiently reduce the switching surges caused by VCB operation. In this paper, factors that drift operating times including control voltage and count of operations are analyzed. An...
Based on the working conditions and development trend of operating mechanism of high-voltage circuit breaker, this paper presented a high-load adjustment rate of portable high-frequency switching power supply designed for high-voltage circuit breakers test. The main circuit topological structure is analysed in detail, which uses the fullbridge circuit and IGBTs (insulated gate bipolar transistor)...
In order to ensure the biped robot operating stably for a long time and make it more environment-friendly and energy-saving, an efficient power management system is designed. It can support an uninterruptible power supply, charging of lithium battery, monitoring and protection of the power, multichannel DC (direct current) outputs of different voltages, etc. Besides, a charge controlling algorithm...
Multilevel converters have excellent performance in power application, especially in high-power medium voltage fields. To find an effective and general strategy for multilevel and multiphase system is a challenge attracting many researchers. This paper analyses the basic analytical meaning of PWM strategy, which is to implement an analog continuous reference value by means of several available discrete...
Double modes inverters, as the interface devices between the microgrid system and public grid, plays an important role in the distributed generation system. In order to realize the connection and disconnection between double modes inverter and public grid, an intelligent switch is necessary. The switch is used to detect the status of grid and inverter, adjust the frequency, amplitude and phase of...
According to the basic characteristics of air plasma cutting inverter, the cutting inverter with sliding mode control (SMC) is researched and designed. Unlike the traditional PI control with the contradictory between the small voltage overshoot and the fast response time, SMC has not only effectively solved the voltage overshoot during the cutting process, but also realized a faster voltage response...
Based on control type soft switching, an interleaved three-phase bidirectional DC/DC converter for high voltage high power applications is presented. The converter main circuit uses the interleaved three-phase bidirectional DC/DC topology and takes use of the three-phase complementary PWM control to implement soft switching condition. The circuit principles, the working modes and control type soft...
A new receiver diversity scheme for differential detection of minimum shift keying (MSK) is proposed. The signal from each receiving branch is translated to a different IF frequency. The IF signals are summed and then detected by a common differential detector. The diversity scheme does not need phase adjusters, signal quality measurement circuits or a switching controller; moreover the error rate...
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