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.

A Bridgeless Resonant Pseudoboost PFC Rectifier

Abstract: In this paper, a new bridgeless single-phase ac-dc converter with a natural power factor correction (PFC) is proposed. Compared with existing single-phase bridgeless topologies, the proposed topology has the merits of less component counts. The absence of an input diode bridge and the presence of only one diode in the current path during each stage of the switching cycle result in higher power density and less conduction losses; hence, improved thermal management compared to existing PFC rectifiers is obtained. The proposed topology is designed to work in resonant mode to achieve an automatic PFC close to unity in a simple and effective manner. The resonant mode operation gives additional advantages such as zero-current turn-on in the active power switches, zero-current turn-off in the output diode and reduces the complexity of the control circuitry. Principle of operation and the feasibility of the proposed converter are provided. Detailed experimental and simulation results are presented.

High efficient bridge rectifiers in 100MHz and 2.4GHz bands

Abstract: This paper describes the high efficient bridge rectifier topology and its implementations in 100MHz and 2.4GHz bands. The rectifier topology realizes full-wave-rectification without large sized filters used in single-shunt type rectifiers. By employing the topology, further downsizing and integration can be achieved easily. High impedance operation with impedance transformer or the high-impedance antenna is employed to improve the rectification efficiency. Also formulas of the rectification efficiency on the proposed topology are described in the paper for clarification of effectiveness. Experimental investigations demonstrate confirmation of the derived formulas. Also 94% efficiency of the 100MHz band rectifier and 80% efficiency of the 2.4GHz rectenna are achieved. These values are the top-level performance with the commercial-based Si-SBD. Also the size of the 2.4GHz band rectifier is 4.5mm × 4.8mm that is the smallest implementation than the past works.

Tunnel FET-based ultra-low power, high-sensitivity UHF RFID rectifier

Abstract: Hetero-junction Tunnel FET (HTFET) for ultra-low power RF circuit design has been explored at the device and circuit level. In this paper, benchmarking and design insights for optimizing the performance of the TFET based differential drive rectifier is presented. Our evaluation of the HTFET based rectifier demonstrates its promise compared to the state-of-art passive RFIDs. With the 10-stage optimized TFET rectifier at 915 MHz, PCE of 98% with 0.5 nW power consumption, sensitivity of -24dBm for 9 μW PDC and sensitivity of -33dBm for 0.4μW PDC were achieved.

Efficiency comparison of voltage source and current source drive system for medium voltage applications

Abstract: This paper calculates and compares the efficiency and loss distribution in three most popular state-of-the-art types of medium voltage drive systems; current source drive with active front-end rectifier, current source drive with 18-pulse thyristor rectifier, and three-level voltage source drive with 12-pulse/24-pulse diode rectifier. Based on the proposed simple and accurate method of calculating switching losses, snubber and filter losses, three-level voltage source drive system has been found to produce the highest efficiency of 98.77% under the rated load of 1.6 MW

Nuclear logging tool electronics including programmable gain amplifier and peak detection circuits

Abstract: A method and apparatus for nuclear logging, and in particular, neutron porosity logging is presented. In accordance with the present invention, a novel programmable gain amplifier circuit and a novel peak detector circuit are used in conjunction with other electronic circuitry to provide borehole formation logs in a nuclear logging tool.