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.

Device for supplying a voltage to an electronic circuit, in particular an electronic circuit associated with a current sensor disposed on an electrical line

Abstract: A device for supplying a power supply voltage to an electronic circuit, in particular to an electronic circuit associated with a current sensor for measuring the electrical current in a high-tension line, comprises a current transformer having a primary circuit and a secondary circuit, a rectifier bridge shunting the secondary circuit and output terminals of the rectifier bridge, a first capacitor in parallel with a first resistor across which said power supply voltage is obtained, and a first switch disposed between the output terminals of the rectifier bridge. It includes between the output terminals of the rectifier bridge a branch comprising in series a second capacitor, a second switch and a second resistor. The first switch is controlled by a first threshold detector shunting the second capacitor. The second switch is controlled by a second threshold detector shunting the first capacitor. The first and second threshold detectors respectively close the first and second switches when predetermined first and second thresholds are respectively reached.

LLC resonant DC/DC converter with current-driven synchronized voltage-doubler rectifier

Abstract: This paper proposes a current driving scheme for synchronous rectifier (SR) in the LLC resonant converter with a voltage-doubler rectifier. The voltage-doubler rectifier has a simple-structure transformer which only needs one winding on the secondary side. The voltage stress across SRs is reduced to half of that in a center-tapped rectifier, which means SRs with smaller on resistance can be used. With one Current Transformer (CT), the proposed current-driven SR features simple and well performs. Most of the reflected current from the CT will be feed backed to the output so that the power loss is low. Due to the current balance in the two output capacitors of the voltage-doubler rectifier, the magnetic balance circuit for the CT is not required. A prototype with 300–400V input and 16V/5.6A output is built to verify the theoretical analysis, and efficiency of the converter is up to 93.5% at 350Vin and full load condition.

A Single-Phase High-Power-Factor Rectifier, Based on a Two-Quadrant Shunt Active Filter

Abstract: This paper presents a new technique to improve the input power factor of a single-phase rectifier followed by an inductive filter. It consists in the employment of a two-quadrant active power filter, based on a conventional bidirectional dc-dc converter, connected to the output side of the diode bridge. This technique allows the extension of this rectifier range operation in the continuous conduction mode. Circuit description, operation principle, modeling, design, and simulation results are presented in this paper. A laboratory prototype was designed and built with the following specifications: input voltage: 220 Vrms; output voltage: 200 Vdc; rated power: 3 kW; and switching frequency: 100 kHz. By the experimental results obtained, the system presented a unity power factor and an efficiency of 95% at full load, while the maximum efficiency value was 98% at 2 kW.

Device for discriminating between two values of a signal with DC offset compensation

Abstract: A device for discriminating between two values of a signal using DC offset compensation including an automatic gain control circuit, a peak detector circuit and a feedback path from the peak detector circuit to the input circuit of the automatic gain control circuit. The value of the feedback current is regulated so that the maximum value of one of the same polarity signals and the opposite polarity signal coincides with the minimum value of the other of the two signals.

Multiple output converter with improved cross regulation

Abstract: A cost effective circuit improves the cross regulation of multiple outputs converter, especially for that output chokes are coupled and a synchronous rectifier is applied to one of the outputs. A DC/DC converter includes a transformer having a primary winding and two secondary windings. The first secondary winding is coupled to a synchronous rectifier and a first output choke. The second secondary winding is coupled to a diode rectifier and a second output choke. The first output choke and the second output choke are coupled. A low power MOSFET switch is added to the diode rectifier for avoiding the diode rectifier operating in DCM when light loaded.