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Traditional IC packaging requires chips to be assembled at the same level, while recently thrived 2.5D/3D IC packaging utilizes skyscraper approach to stack various types of chips with diverse functions occupying similarfootprint, and this approach not only can reduce overall package size, but also can improve electrical interconnection performance. The primary difference between 2.5D/3D IC lies in...
This paper presents a surface scanning touch probe with low touch force for micro-CMM. The displacements of the probe are detected by a 2-DOF mechanism, which is comprised of a round frame, a tungsten stylus and a leaf spring fixed to the base. The design of the stylus is mounted at the centre of a stiff round frame, which in turn is fixed to a leaf spring; meanwhile, a live center which is installed...
This paper presents a current sensorless control for dual-boost full-bridge (DBFB) converter with power factor correction (PFC) function. In this topology, the short-through problem can be avoided, and the freewheeling current flows through the independent diode rather than the body diodes of switches. Therefore, the reliability and availability can be improved. The proposed current sensorless control...
In this paper, the average current method is proposed to detect the open-winding fault of three-phase permanent magnet synchronous motors (PMSMs). The characteristics and operational regions are studied. All the methods are implemented in FPGA-based system. The simulation and experimental results are provided to demonstrate the proposed method.
In this paper, the speed control for two series-connected five-phase permanent magnet synchronous motors (PMSMs) is first proposed where both speeds of two five-phase PMSMs can be controlled independently without any position sensors. In first, the concept of the extended electromotive force (EEMF) developed for single motor is extended for two series-connected five-phase PMSMs. Some experimental...
Two single-phase AC voltage sources with consideration of switch utilization ratio has been presented in this paper. The purpose of this paper is to maximize switch utilization ratio under the limitation of dc-link voltage and the rated parameter values. In first, different topologies connected to the resistive load with ideal dc source are studied, and the filter inductance and capacitance are designed...
In this study is developed by firstly modifying a DVD-ROM drive optical pickup head into height displacement sensor in order to measure the height displacement, and then using a commercially available industrial CCD to capture images immediately for planar contour measurement, and finally integrating an optical design with a 3D measurement system. The system can measure small workpiece surface conditions,...
In this paper, two cascaded electrodynamic shakers are supplied by the three-leg inverter. The conventional comparator-based pulse width modulation (PWM) has limited output voltage region due to the common leg. To enlarge the output voltage region and improve the inverter efficiency, the novel multi-dimensional feedback quantized modulation (MDFQM) is used. All the control algorithms are implemented...
A quad-band voltage-controlled oscillator (QBVCO) is proposed for multi-band satellite communication systems. The presented QBVCO is designed with a transformer feedback topology in a standard 180-nm CMOS technology. By improving the LC-tanks, the output signals of QBVCO exhibit four oscillation frequencies within the satellite communication bands. The lower bands, 15/20GHz, are generated by adopting...
In this paper, the current sensorless control for dual-boost half-bridge (DBHB) converter with power factor correction (PFC) function is presented. The short-through problem can be avoided by the dual-boost structure for enhancing the reliability. It also reduces the power dissipation due to the body diodes' reverse recovery current of switches. Furthermore, the intrinsic voltage-doubler characteristic...
This paper implemented the single-stage DC generating system fed by simulator of PMSM wind turbine. The simulated wind turbine follows the characteristics of a wind turbine by controlling the torque current and the speed of the PMSM. The single-stage DC generating system is implemented by a two-switch DC-DC converter with a battery. DC generating system regulates the equivalent output load to track...
Due to the potential need for ultra-wide input voltage range power factor correction (PFC) circuit, one may consider Buck-boost converter as a PFC circuit (PFC Buck-boost) instead of Boost converter (PFC Boost). The voltage step-up/down freedom of Buck-boost converter allows a lower output voltage and smaller duty cycle compared to Boost converter. In addition, indirect input/output path limits the...
Permanent-magnet synchronous motors (PMSMs) have higher efficiency than the conventional induction motors. The multiphase motors have smaller torque ripple and better fault-through performance than the conventional three-phase motors. In this paper, the speed control of five-phase PMSMs without sensing position is proposed. The provided experimental results demonstrate the proposed position sensorless...
Karaoke has become one of the most important leisure activities in the modern life. The traditional karaoke systems require lyrics to be filled in manually, which requires a significant amount of time. Therefore, an automatic method is needed to improve this process. In this paper, we use a generative theory of tonal music and high-level fuzzy Petri nets to complete music segmentation and karaoke...
Three-level boost PFC converter has advantages of lower inductor current ripple and lower switch withstanding voltage than the boost PFC converter. Interleaved current sensorless control (ICSC) had been proposed for multiphase boost PFC converters. In this paper, ICSC is modified for current sensorless control of the three-level boost PFC converter with the asymmetric loads. The modified interleaved...
The bridgeless power-factor-correction (PFC) converter possesses higher efficiency than the conventional boost-type PFC converter due to its reduced conduction voltage drop and conduction loss. The conventional multiloop control needs to sense the input current to yield the desired sinusoidal current waveform. This paper presents a control method for bridgeless PFC converter to provide sinusoidal...
The maximum operation frequency of a permanent magnet electrodynamic shaker (PMEDS) is 2kHz. To provide good current tracking performance in digital implementation, the PWM frequency is chosen to be 100kHz. Due to the finite turning-on time and the turning-off time of the conventional semiconductor devices, the dead-time has a great effect on the current tracking performance and thus, the dead-time...
Due to its high-efficiency characteristics, the three-level boost converter is often connected between the PV panels and the regulated DC bus to transfer the PV energy efficiently. In the literature, an additional voltage balancing control loop is required to balance the capacitor voltages via sensing the capacitor voltages. In this paper, the three-level boosting MPPT Control with reduced number...
Recently, the advantage of multiphase drive (>3) is demonstrated by a novel system composed of series-connected five-phase induction motors (IMs) and single inverter where their IM windings are connected in series. Due to the additional degree of freedom provided by five-phase AC motors, two IM speeds can be regulated independently. In this paper, high-efficiency series-connected five-phase permanent...
Due to the widely used brushless DC motors (BDCMs) in high-efficiency applications, many square-wave-current sensorless control methods based on voltage source inverters (VSI) had been developed in the literature. Recently, current source inverters (CSI) are receiving more and more attentions due to their inherent short-circuit protection characteristics. But no CSI-based sensorless control had been...
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