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.

Stepped dimming ballast for fluorescent lamps

Abstract: A stepped dimming ballast comprising a filter and rectifier circuit ( 1 ), a DC high voltage stabilizing circuit ( 2 ), a frequency control and switch circuit ( 3 ), a load current feedback circuit ( 5 ), a voltage signal processing circuit ( 6 ) and a voltage signal sampling circuit ( 7 ). The present invention is adapted for use in conjunction with a silicon controlled rectifier dimmer and/or a regular light switch whereby it is novel in structure and able to effect dimming in two predetermined and reliable operation modes.

A Power Enhanced High Efficiency 2.45 GHz Rectifier Based on Diode Array

Abstract: A novel microwave (MW) rectifier based on a diode array is presented in this paper. The diode array composed with sixteen HSMS-282 Schottky diodes is applied to enhance the MW input power. The proposed configuration improves the rectifier power capacitance from 20 dBm level of a single-diode rectifier up to 30 dBm level. The presented design is to use a diode array to replace a single diode without significant modification on the original rectifying circuit. When the input power is between 23 dBm and 33 dBm and the load is at hundred Ohm level, microwave to direct current (MW-DC) conversion efficiency above 60% is realized. The DC output voltage of the rectifier achieves 20.4 V at a load 600 Ohm, when the input MW power is at 30 dBm. The MW-DC conversion efficiency reaches 69.4% in this situation. The maximum power that the rectifier can handle is greater than 33 dBm. The measured temperature of the rectifier shows the power consumption distributed among the diode array evenly.

Frequency converter with an intermediate buck-boost converter for controlling an electric motor

Abstract: The frequency converter is provided for an electric motor and comprises a rectifier, an intermediate circuit and an inverse rectifier which are connected with respect to circuiting technology via a control and regulation circuit. In the inverse rectifier to each motor phase there are allocated at least two electronic switches, one for the side conducting the higher potential and one for the side conducting the low potential. The intermediate circuit is formed as an active intermediate circuit and contains a Buck-Booster converter. It is controlled such that the voltage at the output of the intermediate circuit with respect to magnitude is always smaller than that at the input. By way of this inexpensive components may be used in the inverse rectifier and in particular also in the control and regulation circuit.

Simple controller for single-phase power factor correction rectifier

Abstract: This study proposes a simple low-cost modulating duty cycle analogue controller to reduce line frequency harmonics for high power factor boost rectifier. The proposed method eliminates the need for current sensing, and simultaneously offers the performance results comparable to those of continuous conduction mode (CCM). This scheme also maintains the simplicity comparable to that of discontinuous conduction mode (DCM). Only the output voltage and the rectified input voltage are monitored to vary the duty cycle of the boost switch within a line cycle so that the third-order harmonic, which is the lowest order harmonic of the input current, is reduced. As a result, the total harmonic distortion (THD) of the line current and thus the input power factor is improved. Moreover, the rectifier shows a good transient performance where the converter's output voltage overshoots during input voltage/load transients is reduced. The proposed method is developed for constant switching frequency boost rectifier. Simulation and experimental results are presented to verify the effectiveness of the proposed control method.

A multilevel buck converter based rectifier with sinusoidal inputs and unity power factor for medium voltage (4160-7200 V) applications

Abstract: A novel rectifier topology for high power (0.5 to 10 MVA) current source based AC motor drives is proposed. This rectifier is composed of a multi-winding transformer, a multi-level diode rectifier and a modified multi-level buck converter. The rectifier produces near unity input power factor and sinusoidal input current under any operating conditions. In addition, the proposed rectifier features reliable operation and low manufacturing cost. In this paper, the operating principle of the proposed rectifier is introduced. A number of design issues are investigated, which include PWM switching patterns, input power factor and line current harmonic distortion. Some design considerations such as the effect of the line inductance discrepancy on system performance are addressed. Experiments on a 5 kVA/208V four-level prototype are carried out for verification.