Topic
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.
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TL;DR: In this paper, a simple scheme is proposed for offline unity power factor rectification for high-frequency AC buses (20 kHz), where a bandpass filter of the series-resonant type, centered at the line frequency, is inserted between the line and the full-wave rectified load.
Abstract: A simple scheme is proposed for offline unity power factor rectification for high-frequency AC buses (20 kHz). A bandpass filter of the series-resonant type, centered at the line frequency, is inserted between the line and the full-wave rectified load. The Q=Z/sub 0//R/sub L/ formed by the load and the characteristic impedance of the tank circuit determines the power factor, the boundary between continuous and discontinuous conduction modes, the peak stresses, and the transient response of the rectifier. It is shown that for Q>2/ pi the rectifier operates in continuous conduction mode and the output voltage is independent of the load. Also, it is shown that for Q>2 the line current is nearly sinusoidal with less than 5% third-harmonic distortion and the power factor is essentially unity. An increase in Q causes an increase in the peak voltages of the tank circuit and a slower transient response of the rectifier circuit. The DC, small-signal, and transient analyses of the rectifier circuit are carried out, and the results are in good agreement with simulation and experimental results. >
60 citations
29 Aug 2005
TL;DR: In this article, an offset-compensation method uses a peak detector and multiple tap feedback to achieve 1000/spl times/ improvement in settling time compared to prior state-of-the-art methods.
Abstract: An offset-compensation method uses a peak detector and multiple tap feedback to achieve 1000/spl times/ improvement in settling time compared to prior art. Measurement results for a 3.125 Gbit/s limit amplifier with 42dB gain implemented in a 0.18 /spl mu/m CMOS process are presented.
60 citations
TL;DR: In this article, a simple and robust 24-pulse diode rectifier for low-voltage and high-current applications is proposed, which consists of a conventional four-star 12pulse rectifier and an auxiliary single-phase full-wave rectifier (ASFR) installed at dc side.
Abstract: A simple and robust 24-pulse diode rectifier for low-voltage and high-current applications is proposed in this paper. The proposed 24-pulse diode rectifier consists of a conventional four-star 12-pulse diode rectifier and an auxiliary single-phase full-wave rectifier (ASFR) installed at dc side. The low-power (3.4%Po) ASFR extracts two rectangular currents from the modified second-stage interphase transformer and injects a square current into the output of the rectifier system. This modification extends the conventional four-star 12-pulse operation to 24-pulse operation. The proposed 24-pulse rectifier draws near sinusoidal input line currents with the absence of 5th, 7th, 11th, 13th, 17th, and 19th harmonics. The average value of current through the ASFR has only 1.7% of load current, which means the current rating and conduction losses of ASFR are very small. The proposed scheme has low-diode conduction losses, and it is more suitable for low-voltage and large-current applications. Since only an additional ASFR is needed, the proposed scheme is low cost and simple to implement. The detailed analysis for the proposed rectifier is presented, and experimental results are provided to verify the proposed concept.
60 citations
07 Oct 1990
TL;DR: In this article, a power factor improvement to a diode rectifier having a high-frequency inverter on the load is described based on dither signal effects for linearization of the nonlinear system.
Abstract: A power factor improvement to a diode rectifier having a high-frequency inverter on the load is described. The principle of the improvement is based on dither signal effects for linearization of the nonlinear system. A diode rectifier circuit, which can be regarded as a dead-zone element, is linearized based on this principle by adding a high-frequency dither signal to the input voltage. The output voltage of the high-frequency inverter is applied to the dither, which makes the input current of the rectifier sinusoidal. The dither rectifier circuit is composed of a diode voltage-doubler rectifier and a high frequency inverter that consists of only two switching elements. Its power factor is shown to be 99.2%, and the third and fifth harmonics are 10% and 0.4%, respectively. Uses of the high-frequency inverter in fluorescent lamp and switching power supply applications are discussed. >
60 citations
TL;DR: In this paper, a very simple pseudo RMS-to-DC current converter for sinusoidal signals is described, which uses a CMOS precision current rectifier consisting of only two transistors and thus operates throughout the current domain.
Abstract: A very simple pseudo RMS-to-DC current converter for sinusoidal signals is described. The most salient feature of the circuit is that it uses a CMOS precision current rectifier consisting of only two transistors and thus operates throughout in the current domain. The full-wave rectifier was built using CD4007 devices and tested. It was observed that the transfer curve is sharp even at low nanoampere input levels. The converter is expected to work up to 100 kHz. >
60 citations