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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18 Jun 2006
TL;DR: In this paper, an IGBT-based auxiliary converter (AXC) system is proposed to compensate the harmonic current of the rectifier when the load consumes power, which can channel the re-generation energy back into the utility system.
Abstract: In variable speed drives systems, diode rectifiers and thyristor rectifiers are often used as the front-end circuit for AC/DC conversion. The advantages of the conventional rectifier are its simplicity and high reliability. The drawbacks include the harmonic current distortion and the lack of re-generation capability. In recent years, industries adopt the transistor-based active front-end technologies to accomplish high power factor operation and re-generation capability. However, the cost of active front-end is much higher than the conventional diode/thyristor front-end. Besides, the active front-end is often less reliable than the diode/thyristor front-end under utility transients. In this paper, an IGBT-based auxiliary converter (AXC) system is proposed. The AXC operates as a shunt active filter to compensate the harmonic current of the rectifier when the load consumes power. When the DC load re-generates, the AXC system can channel the re-generation energy back into the utility system. The combination of the diode rectifier and the AXC can accomplish unity power factor operation and re-generation, but it also causes circulating current between the AXC and the rectifier, which leads to higher operational losses and higher noise level. The mechanism of the circulating current is analyzed in this paper, and solutions are also presented. Computer simulation and field test results are presented to validate the performance of the proposed AXC system.
21 citations
12 May 2011
TL;DR: An improved detector topology is introduced which is used to design the rectifier that is a part of a rectenna, operating in the S-band, and a third diode is added into the conventional half bridge detector to improve the output DC voltage and to reduce the harmonics power level.
Abstract: This paper introduces an improved detector topology which is used to design the rectifier that is a part of a rectenna, operating in the S-band. Our proposition adds a third diode into the conventional half bridge detector, leading to improve the output DC voltage and to reduce the harmonics power level. Then, a rectifying circuit is built using two approaches. The first rectifier is based on a HSMS2822 doubler with a HSMS2820 diode. While the second rectifier uses a HSMS282P quad. We have achieved a RF-DC conversion efficiency of 57% at 2.45 GHz and of 72% at 2.1 GHz, respectively for the first and the second rectifier.
21 citations
TL;DR: In this paper, the fundamental effects of electrical loads containing non-resistive components (e.g., rectifiers and capacitors) on electromagnetic energy harvester performance were investigated.
21 citations
01 Dec 2009
TL;DR: A 2.4 GHz band high-efficiency RF rectifier and high sensitive dc voltage sensing circuit is implemented, using native threshold voltage diode-connected NMOS transistors to avoid the power loss due to the threshold voltage.
Abstract: A 2.4 GHz band high-efficiency RF rectifier and high sensitive dc voltage sensing circuit is implemented. A passive RF to DC rectifier of multiplier voltage type has no current consumption. This rectifier is using native threshold voltage diode-connected NMOS transistors to avoid the power loss due to the threshold voltage. It consumes only 900nA with 1.5V supply voltage adopting ultra low power DC sensing circuit using subthreshold current reference. These block incorporates a digital demodulation logic blocks. It can recognize OOK digital information and existence of RF input signal above sensitivity level or not. A low power RF rectifier and DC sensing circuit was fabricated in 0.18um CMOS technology with native threshold voltage NMOS; This RF wake up receiver has -28dBm sensitivity at 2.4 GHz band.
21 citations
12 Jul 2009
TL;DR: In this article, a secondary diode charge pump is used to generate the DC bias for the threshold voltage compensation, and the circuit is implemented in a standard CMOS technology and operates at a minimum available power of −11.3 dBm for an output DC power of 7.5 µW.
Abstract: The operating range of passive UHF transponder systems is largely determined by the tag current consumption and the rectifier efficiency. Reading ranges of several meters have recently been reported for many state of the art RFID (Radio frequency IDentification) tags [1]. At this distance, the main issue for the rectifier design is the low amplitude of the high frequency antenna signal. Schottky diodes are often used for their low forward voltage drop and high switching speed. As an alternative to Schottky diodes, different circuit techniques for compensating the threshold voltage of standard transistor diodes have been utilized [4]. The transistor gates are biased near the threshold voltage, so that the devices effectively act as diodes with very low forward voltage drop. In the presented rectifier, a secondary diode charge pump is used to generate the DC bias for the threshold voltage compensation. The circuit is implemented in a standard CMOS technology and operates at a minimum available power of −11.3 dBm for an output DC power of 7.5 µW.
21 citations