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Piezoelectric microelectromechanical systems (MEMS) resonators on Si can be a potential candidate to replace discrete L-C components in series resonant converters. In this paper, ring shaped piezoelectric (AlN) micro-resonators on Si are reported. Having vibration in contour mode, these resonators can achieve resonant frequency as low as 87.28 MHz. Recently, we have fabricated high Q (>1000) piezoelectric...
This paper presents a simplified envelope model to study the dynamics of a phase-controlled resonant converter suitable to drive light emitting diode (LED) lamps. The approximate closed form of the transfer function is obtained from the proposed reduced-order model. The fast dynamics of the resonant converter allows us implementing a pulsed current source with active control of the on-time-current...
Achieving high efficiency with improved power transfer range and misalignment tolerance is the major design challenge in realizing Wireless Power Transfer (WPT) systems for industrial applications. Resonant coils must be carefully designed to achieve highest possible system performance by fully utilizing the available space. High quality factor and enhanced electromagnetic coupling are key indices...
Inductorless switch mode power supplies based on piezoelectric transformers are used to replace conventional transformers in high power density switch mode power supplies. Even though piezoelectric-based converters exhibit a high degree of nonlinearity, it is desirable to use piezoelectric transformers due to their smaller size, lighter weight, lower electromagnetic interference, higher power density,...
This paper presents a new middle-stage current-fed high-frequency link inverter (MSCF-HFLI). The proposed inverter only contains one passive buffering energy element comparing with conventional resonant type HFLI, which at least has two passive buffering energy elements. The topology of the proposed inverter is given and the operational principle in a line-frequency cycle is analyzed, which is similar...
Plug-In hybrid electric vehicles could be connected to the electrical grid to be recharged. To ease the charging process, one can use an on-board charger to charge the electric vehicle battery. The on-board charger should have small size and light weight. On the other hand, the charger should draw current at high power factor to maximize power from an outlet. Most of the existing battery chargers...
Finite control set model predictive control (FS-MPC) has been shown to be a very effective approach to control of PMSM drives. FS-MPC is a very flexible tool since it can evaluate an arbitrary loss function. However, design of the appropriate loss function for the problem can be a challenge especially when the design input is visible only on the long horizon. An example where this problem becomes...
In this study, a CLL resonant converter with different control strategies; frequency, dc-link, and phase shift control are compared and a hybrid control is proposed to increase the efficiency of the system for Electric Vehicle (EV) battery charger applications. The comparison analysis is examined considering the battery charging control algorithms constant current (CC) and constant voltage (CV) with...
The paper deals with investigation of electrical properties of resonant converter with LC2L2C2 resonant network. Main circuit of proposed converter consists of two series LC resonant branches and of two parallel LC sinusoidal output filters. First the topology of proposed converter is being described, whereby main focus is given for application field and on possibility of its variable use. After it...
This paper presents High-gain power conditioning system for grid connected PV applications. The construction of the proposed system consists of high-gain Switched Inductor Quadratic Boost Inverter (SIQBI) and five-switch h-bridge inverter. The proposed system is controlled to satisfy the following criteria: extract maximum power from PV module, boost dc voltage to higher level and inject sinusoidal...
The use of proportional resonant (PR) current controller in grid side wind power converters instead of the traditional proportional integral (PI) controller has gained a large popularity. Particularly its capability for compensating harmonics in the current waveforms is an essential feature. Due to the replacing of the generator side converter by a simple diode rectifier, harmonics with variable frequencies...
This paper is based on a method recently developed by the authors to characterize analytically, without switching angle determination, the voltage harmonic three-phase systems generated by the switching of PWM inverters. On this basis, it is possible to define control strategies that modify the spectral content of the output signals. The presented developments are focused on the carrier phase jump...
In this paper, several control techniques for induction metal treating are examined to assess their performances using resonant series inverter. In fact, many types of steel are treated with heat to increase toughness and resistance to wear. Induction heating seems to be appropriate and provides several advantages in comparison with conventional techniques. In this paper, these techniques are evaluated...
Typical wireless power transfer systems utilize series compensation circuit which is based on magnetic coupling and resonance principles that was first developed by Tesla. However, changes in coupling caused by gap distance, alignment and orientation variations can lead to reduce power transfer efficiencies and the transferred power levels. This paper proposes impedance matched circuit to reduce frequency...
In this paper, a general multirate approach is proposed for direct closed-loop identification of mechanical resonances above the Nyquist frequency without injecting any external persistently exciting (PE) signals. Based on the polynomial transformation technique, an extended least-squares (ELS) algorithm is designed to estimate parameters of the mixed-rate model, from which parameters of the fast-rate...
A high performance H∞ controller designed to control an Active Magnetic Bearing (AMB) system is considered in this paper. A digital signal processor (DSP) is used to implement the designed controller in real-time. The designed H∞ controller is compared with a conventional lead-lag type compensator and the on-board analogue controller of the AMB under various conditions and disturbances acting on the...
The present paper analyzes the reduction of the double frequent power pulsations in the DC-link of a single phase ZSI by using a passive resonant circuit. Three possible and effective topologies for the resonant circuit have been examined. The advantages and disadvantages of the three versions have been discussed in this paper and validated by measurements on a laboratory set-up.
Adaptable cooking surfaces are at the forefront of design trends because of the many advantages offered to users. These improvements and advantages have their counterpart in the increased design challenges related to inductors and power electronics. Shifts in the relative position between the pan and the inductor may cause the inductor to be totally or partially uncovered, leading to changes in the...
For high-precision control of a two-inertia system, information of both the drive side and the load side is usually required for obtaining high control bandwidth. In order to reduce the implementation cost and space, a novel control method, which employs the load side information only, is proposed using a high-resolution encoder which is today widely used in various fields. Simulation and experimental...
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