High‐efficiency rectifier (5.2 GHz) using a <scp>C</scp>lass‐<scp>F</scp><scp>D</scp>ickson charge pump

Bae, Ji Cheol; Koo, Hyungmo; Lee, Hwiseob; Lim, Wonseob; Lee, Wooseok; Kang, Hyunuk; Hwang, Keum Cheol; Lee, Kang-Yoon; Yang, Youngoo

doi:10.1002/mop.30862

Cited by 8 publications

(10 citation statements)

References 21 publications

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“…In this study, higher power conversion efficiency was obtained with lower load resistance value. 10 5 Note: Bold values are used to specifically indicate that the work in this article provides the same efficiency at lower voltages than the above work (50 one).…”

Section: Discussionmentioning

confidence: 99%

“…One of the most widely known RF rectifier circuits is the Dickson rectifier . The circuit, which can basically respond to low current and voltage, provides achieving high power conversion efficiency and high DC voltage over the output load . In addition to being practical and simple, Dickson rectifier circuits are widely preferred because they are suitable for being developed .…”

Section: Introductionmentioning

confidence: 99%

“…7,8 The circuit, which can basically respond to low current and voltage, provides achieving high power conversion efficiency and high DC voltage over the output load. 9,10 In addition to being practical and simple, Dickson rectifier circuits are widely preferred because they are suitable for being developed. 7,11,12 Another advantage of the energy harvesting process with Dickson circuits is that it creates a staged-structure by adding the same rectifier circuit one after the other.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of rectifier stage number and load resistance in an RF energy harvesting circuit

Kasar

Gözel

Kahriman

2019

Micro & Optical Tech Letters

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In this study, a single‐stage and three‐stage Dickson rectifier circuits that would be able to perform RF energy harvesting were proposed. Operating frequency was selected as 1 GHz. The highest efficiency value was obtained at 7 dBm input power. The load resistance values for the input power were parametrically analyzed and the power conversion efficiency and output voltage were calculated. In the cases where the best performance was obtained, while a maximum power conversion efficiency of 70.5% was obtained in the single‐stage Dickson circuit, maximum 77% efficiency was obtained in the three‐stage circuit. In addition, in the cases where the highest efficiency was observed, the load resistance values were calculated as 5590 and 14 610 Ω at the single stage and three stages, respectively. The load resistance value used to obtain higher efficiency values in the three‐stage circuit is increasing. Moreover, it was observed that as the number of stages increased, the output voltage also increased linearly. The maximum output voltage which was 1.8 V in the single‐stage was measured as ~5.16 V in three‐stages.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of rectifier stage number and load resistance in an RF energy harvesting circuit

Kasar

Gözel

Kahriman

2019

Micro & Optical Tech Letters

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“…Since RF–DC converters have been applied to various sensors that acquire energy or information for the operation from the input RF signal in addition to the MPT systems, a lot of previous studies of various aspects can be found [9,10,11,12,13,14,15,16,17]. Harmonic termination can be used to improve the conversion efficiency of the RF–DC converter based on the Schottky diode [9,10,11,12,13,14,15,16]. The authors in [9] realized a class-C operation at 2.45 GHz was realized using a shunt diode with short-circuited second and third harmonics, and reported an efficiency of 72.8% and an output voltage of 1.91 V using an input power of 8 dBm with a load resistance of 742 Ω.…”

Section: Introductionmentioning

confidence: 99%

5.8 GHz High-Efficiency RF–DC Converter Based on Common-Ground Multiple-Stack Structure

Bae

Choi

et al. 2019

Sensors

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This paper presents a 5.8 GHz RF–DC converter for high conversion efficiency and high output voltage based on a common-ground and multiple–stack structure. An RF isolation network (RFIN) for the multiple-stack RF–DC converter is proposed to combine the DC output voltage of each stack without separating its RF ground from the DC ground. The RFIN is designed using micro-strip transmission lines on a single-layer printed circuit board (PCB) with a common ground for the bottom plate. A 4-stack RF–DC converter based on a class-F voltage doubler for each stack was implemented to verify the proposed RFIN for the multiple-stack and common-ground structure. The performances of the implemented 4-stack RF–DC converter were evaluated in comparison to the single-stack converter that was also implemented. The size of the implemented 4-stack RF–DC converter using bare-chip Schottky diodes is 24 mm × 123 mm on a single-layer PCB. For an input power of 21 dBm for each stack of the RF–DC converter with a load resistance of 4 kΩ, a high efficiency of 73.1% and a high DC output voltage of 34.2 V were obtained.

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“…The Rx consists of a 1×5 rectenna array that receives RF signals and converts them from RF to dc. A voltage doubler based on single-stage class-F structure was applied to maximize the conversion efficiency[31]. A 2-section input matching network for the individual rectifier based on a series transmission line and an open stub was designed for class-F operation and fundamental impedance matching.…”

mentioning

confidence: 99%

LUT-Based Focal Beamforming System Using 2-D Adaptive Sequential Searching Algorithm for Microwave Power Transfer

Bae

Koo

et al. 2020

IEEE Access

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This paper presents a look-up table (LUT)-based focal beamforming system that can effectively transmit RF power up to mid-range distances (≤ 3 m) including when the Rx is in the nearfield zones. The Tx elements control and radiate signals for the Rx even at the near-field zone ensuring the received signals are in-phase. Since the proposed system uses a LUT for storing the phase sets of the signals for the Tx elements, it requires only very simple hardware and a very simple adaptive control algorithm compared to conventional retroreflective method. In order to track the moving Rx, a 2-D adaptive sequential searching algorithm is proposed. The system can find the optimum phase set by sequentially searching the phase sets for a predetermined 2-D area. The LUT of the phase sets are generated using geometric analysis over the entire 2-D area where the Rx could be located. To verify the proposed method, a 5.2 GHz mid-range (≤ 3 m) MPT system composed of a 4×8 Tx array and a 2×3 Rx array was designed and implemented. Using the proposed 2-D adaptive sequential searching algorithm, the optimum phase set for focal beamforming can be quickly found for a given position of the Rx. In our experiments, the results showed an RF power level of 177.8 mW was received at the Rx with a distance of 1 m with a total radiated RF power of 16 W. Since the measured received power levels for various Rx positions agree well with the simulation results, the proposed system was proved to be an excellent candidate for the practical application. INDEX TERMS Microwave power transfer, Look-up table, Focal beamforming, 2-D adaptive sequential searching algorithm.

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High‐efficiency rectifier (5.2 GHz) using a Class‐FDickson charge pump

Cited by 8 publications

References 21 publications

Analysis of rectifier stage number and load resistance in an RF energy harvesting circuit

Analysis of rectifier stage number and load resistance in an RF energy harvesting circuit

5.8 GHz High-Efficiency RF–DC Converter Based on Common-Ground Multiple-Stack Structure

LUT-Based Focal Beamforming System Using 2-D Adaptive Sequential Searching Algorithm for Microwave Power Transfer

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