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 article, a modulation concept for the uni-and bidirectional SWISS rectifier was proposed, which mitigates ac input current distortions at the mains voltage sector boundaries.
Abstract: This paper describes a new modulation concept for the uni- and bidirectional SWISS rectifier, which mitigates ac input current distortions at the mains voltage sector boundaries. An analytical model is derived and compared to simulations, which allows an estimation of the distortion's magnitude from design parameters, showing that these distortions increase the input current total harmonic distortion (THD) significantly. A modification of the original circuit topology is proposed, which decouples the operation of SWISS Rectifier's active third-harmonic current injection network and its dc–dc converter switches. An algorithm is presented which allows the calculation of a temporary pulse width modulation for the SWISS Rectifier's current injection network to mitigating the distortions. The concept is verified for both power flow directions and for operation with unsymmetrical and distorted mains voltages by measurement results taken on a bidirectional 7.5-kW SWISS Rectifier prototype. An ac input current THD of 1.3% results for symmetric sinusoidal mains voltages and 1.4% and 1.6% for operation with distorted and unsymmetrical mains voltages.
51 citations
TL;DR: In this paper, a novel adaptive power rectifier operating at four bands to harvest the electromagnetic energy in the low and wide-range power density conditions was presented, where the power range of the rectifier was extended by two operation modes controlled adaptively by a FET switch according to the input power level.
Abstract: This letter presents a novel adaptive power rectifier operating at four bands to harvest the electromagnetic energy in the low and wide-range power density conditions. The power range of the rectifier is extended by two operation modes controlled adaptively by a FET switch according to the input power level. A cross-shaped match stub connected by a stepped impedance microstrip line is designed to make the rectifier work at four bands. Two cascaded radial open stubs act as a dc-pass filter to block the fundamental frequency wave and the high order harmonics to further improve the RF-DC (radio frequency-direct current) efficiency, and to smooth the output dc power. When the input power level is −10dBm, the measured maximum RF-DC efficiencies are 47.8%, 33.5%, 49.7% and 36.2% at the frequencies of 0.89GHz, 1.27GHz, 2.02GHz and 2.38GHz, respectively. The efficiency is above 30% in every band when the input power is from −12dBm to 12dBm, which shows a wide input power range.
51 citations
Patent•
24 Feb 2003TL;DR: In this article, an auxiliary active clamp circuit and a method of clamping a voltage of a rectifier switch associated with a power converter is presented. But the auxiliary clamp circuit also includes an auxiliary clamp switch that receives a drive signal from a secondary winding and conducts during the main conduction period.
Abstract: The present invention is directed to an auxiliary active clamp circuit and a method of clamping a voltage of a rectifier switch associated with a power converter. The power converter includes a main active clamp circuit associated with a main power switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer. The main power switch conducts during a main conduction period of the power converter and the rectifier switch conducts during an auxiliary conduction period of the power converter. In one embodiment, the auxiliary active clamp circuit includes an auxiliary clamp capacitor, coupled across the rectifier switch, that stores a clamping voltage substantially equal to an off-state voltage of the rectifier switch. The auxiliary active clamp circuit also includes an auxiliary clamp switch, coupled in series with the auxiliary clamp capacitor, that receives a drive signal from a secondary winding and conducts during the main conduction period thereby clamping a voltage across the rectifier switch at about the clamping voltage.
51 citations
Patent•
31 Mar 1998TL;DR: In this paper, a soft start bridge rectifier circuit is described for controlling the operation of the bridge rectifiers in order to ramp up the DC output upon connection with the AC input to limit in-rush current.
Abstract: A soft start bridge rectifier circuit is described for controlling the operation of the bridge rectifier in order to ramp up the DC output upon connection with the AC input in order to limit in-rush current Additionally, short-circuit/overload protection, temporary line loss protection and undervoltage checking circuitry is provided
51 citations
TL;DR: In this paper, the principal performance characteristics of a mercury-arc rectifier or inverter are investigated. But the methods given are suitable for practical use, and can be applied without expert knowledge of rectifier circuit theory.
Abstract: The paper gives methods by which the principal performance characteristics of mercury-arc rectifier or inverter equipments that are likely to be of interest to operating engineers, eg regulation, power factor, magnitudes of harmonics, etc, can be quickly determined The methods given are suitable for practical use, and can be applied without expert knowledge of rectifier circuit theory
51 citations