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.

Active harmonic suppression of paralleled 12-pulse rectifier at DC side

Abstract: In order to improve the ability of harmonic suppression, and reduce the loss of switching devices, this paper proposes an active harmonic suppression method at dc side of multi-pulse rectifier (MPR). The circulating current through secondary winding of active inter-phase reactor (AIPR) is derived from the current relation between the ac and dc sides of MPR when the three-phase input currents are sinusoidal simultaneously, and an applicable circulating current is presented. According to the relation between voltage across secondary winding of AIPR and the applicable current, it is confirmed that harmonic energy of input line current can be consumed by the resistor in series with the secondary winding. A half-bridge PWM rectifier is designed to abstract the harmonic power and to feed the load, which can realize the recycling of harmonic energy. Experimental results show that the power factor of the proposed system is approximately equal to one when the PWM rectifier operates normally, and that the proposed system has the ability of anti-variation of load and input voltage.

Method for controlling a rectifier circuit with controlled rectifiers and associated quenching devices

Abstract: In a method and corresponding circuitry for controlling a rectifier circuit having a controlled rectifier, the controlled rectifier is fired at an electrical angle alpha and is quenched at an electrical angle beta . A circuit arrangement is provided for establishing a quenching period during which quenching of the controlled rectifier occurs. This quenching period begins at an electrical angle after the A.C. supply current has reached its maximum value and ends prior to the electrical angle at which the A.C. supply voltage subsequently crosses through zero. The controlled rectifier is quenched at an angle beta lying within the quenching period and having a value which is adjustable in dependence on a momentary value of the A.C. supply current.

A comparative study of high voltage (4 kV) power rectifiers PiN/MPS/SSD/SPEED

Abstract: This paper provides for the first time a comparative experimental study of different high voltage power rectifier structures designed based on the anode injection efficiency control concept. Trade-off curves of peak reverse current density, reverse recovery charge extracted and reverse dJ/dt versus forward voltage drop showed the merged PiN-Schottky (MPS), self-adapting P-emitter diode (SPEED), and static shielding diode (SSD) rectifiers to have far superior switching characteristics when compared to conventional PiN diodes. The uniform carrier distribution observed in the MPS/SPEED/SSD rectifiers leads to a universal trade-off curve in anode injection efficiency control diodes that is inherently superior to that obtained through lifetime control techniques. The SPEED rectifier is most attractive for high voltage applications due to its low reverse leakage current, while the MPS rectifier provides an excellent alternative to the high voltage PiN diode due to the identical fabrication process and its superior switching characteristics.

Direct AC/DC Rectifier with Mitigated Low-Frequency Ripple Through Waveform Control

Abstract: In a rectification system with unity power factor, the input power consists of a DC and a double-line frequency power component. Traditionally, an electrolytic capacitor (E-Cap) is used to buffer the double-line frequency power such that the DC output presents a small voltage ripple. The use of E-Cap significantly limits the lifetime of the rectifier system. In this paper, a differential AC/DC rectifier based on the use of an inductor-current waveform control methodology is proposed. The proposed configuration achieves single-stage direct AC/DC rectification without the needs of a front-stage diode rectifier circuit, an input EMI filter, and an E-Cap for buffering the double-line frequency power. The feasibility of the proposal has been practically confirmed in an experimental prototype.

A five level diode clamped rectifier with novel capacitor voltage balancing scheme

Abstract: In this paper, a Diode Clamped Multilevel Topology operating in Rectifier mode is presented. A simple voltage control strategy is implemented in order to control the DC-link voltage at the output side of the rectifier. A Level shifted Carrier based Sine PWM or SVM techniques can be incorporated to generate switching signals to the devices of Five-level configuration. For Diode Clamped Converter if the number of levels increased beyond three, charge balance among the capacitors is a major issue. A simple charge balance circuit is analysed for 5-level converter and a new voltage balance control scheme is proposed for maintaining equal capacitor voltages. MATLAB based simulation results are presented for the proposed scheme along with the conventional scheme for comparison. The converter also works as High Power Factor Rectifier and draws sinusoidal supply currents with unity power factor.