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.

Multi-level multi-output single-phase active rectifier using cascaded H-bridge converter

Abstract: A high-energy efficiency active rectifier has been implemented using cascaded H-bridge converter. As multiple levels can be synthesised by the cascaded H-bridge converter, the switching frequency of the active rectifier can largely be reduced. Consequently, the switching losses will be highly decreased. Novel switching strategy and control law have also been derived for the rectifier, so that power factor correction and multiple DC outputs can both be achieved. As an illustration, a 15-level active rectifier has been implemented using only three cascaded H-bridges. Voltage regulation for each individual bridge has also been achieved. Experimental results are included to demonstrate the effectiveness of the proposed rectifier.

Electronic lamp ballast with voltage source power feedback to AC-side

Abstract: Power factor is improved, and line current total harmonic distortion (THD) is reduced by feeding high frequency current from a voltage source directly to one of the AC-side rectifier terminals. The low frequency power source presents a low value capacitive source impedance to the AC-side rectifier terminals. A resonant load lamp circuit is connected between an inverter output node and one of the DC outputs of the input rectifier circuit. A high frequency capacitor is connected between an AC-side terminal of the input rectifier circuit and a voltage source such as one of the lamp terminals or the inverter output. If the connection is to the inverter output, preferably a second high frequency capacitor is connected from the other of the AC-side terminals to the inverter output.

Systems and methods for utilizing an active compensator to augment a diode rectifier

Abstract: The subject matter described herein includes an active compensatory augmented diode bridge rectifier system. According to one aspect, the system comprises a generator unit configured to generate a current flow comprised entirely of active current and a diode rectifier configured to receive the active current from the generator unit, to direct the active current to a connected power grid, and to receive a reactive current. The system further includes an active compensator configured to optimize the generator unit to produce the active current and to generate the reactive power used to facilitate the operation of the diode rectifier.

Apparatus for compensating reactive power in a three-phase network

Abstract: An apparatus for compensating for the reactive power in a three-phase network. The apparatus includes an uncontrolled rectifier, an intermediate DC link connected to the rectifier, and a self-commutating inverter connected to the DC link and controlled so as to have a pulse-width modulated output.

Automatic timing adjustment for synchronous rectifier circuit

Abstract: A circuit includes a conduction detector configured to monitor conduction of a body diode of a synchronous rectifier switch relative to a predetermined threshold and to generate a detector output that indicates conduction or non-conduction of the body diode. A window analyzer is configured to generate a timing signal to indicate if the synchronous rectifier switch is turned off prematurely or turned off late relative to an on-time turn off based on the detector output from the conduction detector. A controller is configured to adjust the timing of the synchronous rectifier switch based on whether the timing signal indicates that the synchronous rectifier switch is turned off prematurely or turned off late relative to the on-time turn off.