Precision rectifier

About: Precision rectifier is a research topic. Over the lifetime, 4952 publications have been published within this topic receiving 63668 citations. The topic is also known as: super diode.

Programmable PFC based hybrid multipulse power rectifier for ultra clean power application

Abstract: A novel hybrid three-phase rectifier is proposed. It is capable to achieve high input power factor (PF) and low total harmonic input currents distortion (THD/sub I/). The proposed hybrid high power rectifier is composed by a standard three-phase six-pulse diode rectifier (Graetz bridge) with a parallel connection of single-phase Sepic rectifiers in each three-phase rectifier leg. Such topology results in a structure capable of programming the input current waveform and providing conditions for obtaining high input power factor and low harmonic current distortion. In order to validate the proposed hybrid rectifier, this work describes its principles, with detailed operation, simulation, experimental results, and discussions on power rating of the required Sepic converters as related to the desired total harmonic current distortion. It is demonstrated that only a fraction of the output power is processed through the Sepic converters, making the proposed solution economically viable for very high power installations, with fast investment payback. Moreover, retrofitting to existing installations is also feasible since the parallel path can be easily controlled by integration with the existing dc-link. A prototype has been implemented in the laboratory and it was fully demonstrated to both operate with excellent performance and be feasibly implemented in higher power applications.

Diode-less mechanical H-bridge rectifier for “zero threshold” vibration energy harvesters

Abstract: In this paper the idea of a mechanical, diode-less, H-bridge voltage rectifier for applications to vibration energy harvesting systems is presented. Two piezoelectric bistable cantilevers that respond anti-symmetrically to environmental mechanical vibrations are used to generate an electrical voltage via piezoelectric transducers; they also, alternately close the electrical contacts between the generation and the storage stages of the harvester, thereby implementing the desired rectifying action. The piezoelectric voltage is, thus, rectified and current is transferred to the storage capacitor without having to overcome a threshold, as would be the usual case of diode bridge rectifiers. The H-bridge approach is therefore particularly suitable when low output voltages are generated: it works very well, in fact, both for low rms amplitude random vibrations in a low frequency band, and for micro and nanoscale systems. An analytic dynamical model of the anti-symmetric bistable cantilever system is presented, together with the results of numerical simulations; we also present the results of an experimental validation on a laboratory prototype.

Comparison of not synchronized sawtooth carrier and synchronized triangular carrier phase current control for the VIENNA rectifier I

Abstract: Integrated control circuits being available for the input current control of single-phase power factor correctors are frequently applied also for realizing a simple current control for each phase of a three-phase PWM rectifier system. There, the input currents are controlled independently although the three phases are mutually coupled, i.e., the sum of the phase currents is forced to zero for missing connections between the mains star point and the output voltage center point. However, ignoring of the coupling of the three phases results in increased amplitudes of harmonics with switching frequency and/or in a significantly higher ripple of the rectifier input current. This is shown in this paper by a detailed analysis of different current control concepts for a three-phase three-switch three-level boost-type PWM rectifier (VIENNA Rectifier I) with unity power factor. The theoretical considerations are verified by digital simulations and an experimental analysis of a laboratory prototype and are valid in general for three-phase boost-type voltage DC link PWM rectifier systems.

Wide-Range Adaptive RF-to-DC Power Converter for UHF RFIDs

Abstract: A wide-range, differential, cross-coupled rectifier is proposed with an extended dynamic range of input RF power that enables wireless powering from varying distances. The proposed architecture mitigates the reverse-leakage problem in conventional, cross-coupled rectifiers without degrading sensitivity. A prototype is designed for UHF RFID applications, and is implemented using 0.18 $\mu\text{m}$ CMOS technology. On-chip measurements demonstrate a sensitivity of −18 dBm for 1 V output over a 100 $\text{k}\Omega$ load and a peak RF-to-DC power conversion efficiency of 65%. A conventional, fully cross-coupled rectifier is fabricated alongside for comparison and the proposed rectifier shows more than 2× increase in dynamic range and a 25% boosting in output voltage than the conventional rectifier.

Comparative theoretical and experimental evaluation of bridge leg topologies of a three-phase three-level unity power factor rectifier

Abstract: In this paper a theoretical and experimental analysis of the voltage stress on the power semiconductors employed in a bridge leg of a unidirectional three-phase three-level PWM (VIENNA) rectifier is given. Furthermore, a new turn-on snubber is proposed which does improve the rectifier efficiency by 0.3% as verified by an experimental analysis and a detailed loss breakdown.