The Cockcroft-Walton voltage multiplier fed by an inverter in which the series resonant phenomena were used
18 Apr 2018-pp 1-6
TL;DR: In this article, the authors describe the phenomena occurring in the Half-Wave Cockcroft-Walton voltage multiplier when it is supplied through a transformer by an inverter with a rectangular shape of output voltage.
Abstract: The article describes the phenomena occurring in the Half-Wave Cockcroft-Walton voltage multiplier when it is supplied through a transformer by an inverter with a rectangular shape of output voltage. The frequency of the inverter output voltage was selected so that a series resonant phenomena occurs in the system. They are caused by the presence of voltage multiplier capacitors and transformer leakage inductances. In the article the characteristics and waveforms of voltages and currents obtained by simulations are presented. The results of simulations were used to build two prototypes with maximum powers of about 60 W and 160 W and a 40 kV output voltage.
Citations
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DOI•
30 Jun 2019
TL;DR: In this paper, the effect of load resistance, input power and input frequency on the performance of voltage multipliers was analyzed and compared with each other, and the best efficiency was obtained by Greinacher voltage multiplier for low input frequencies which is lower than 1 GHz but there are no significant differences are observed for high frequencies.
Abstract: Voltage multipliers are widely used for energy harvesting processes to convert the received AC signal to DC signal, also enhanced the low level received signal. In this study, Villard, Dickson and Greinacher type voltage multipliers are analyzed without impedance matching and substrate materials to decide the effective voltage multiplier type depend on the inputs of the harvester. So, load resistance, input power and input frequencies’ effects are analyzed and compared with each other. Agilent Advanced Design System (ADS) is used for simulations. HSMS 2852 Schottky diode and capacitors are used for these voltage multipliers. Results show that, determining load resistance is important for evaluating high efficiency, e.g. efficiency differences are reached 33% between 2kΩ and 20 kΩ for Dickson voltage multiplier at 100 MHz input frequency. Furthermore, the best efficiency is obtained by Greinacher voltage multiplier for low input frequencies which is lower than 1 GHz but there are no significant differences are observed for high frequencies. This study shows that load resistance, input frequency and input power are important parameters for voltage multiplier selection and Greinacher voltage multiplier is the best choice to obtain high efficiency for low frequency application of RF harvesting.
10 citations
References
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TL;DR: In this article, the authors proposed a hybrid symmetrical voltage multiplier (HSVM) for dc highvoltage applications, which is formed by cascading a diode-bridge rectifier and an SVM with diode bridge rectifier as the first stage of multiplier.
Abstract: Voltage multiplier circuits are widely used in many high-voltage/low-current applications. A conventional symmetrical voltage multiplier (SVM) has much better performance, when compared with its half-wave counterpart. However, it requires a high-voltage transformer (HVT) with center-tapped secondary to perform its push-pull kind of operation. The design of an HVT with center-tapped secondary is relatively complex. This paper proposes a hybrid SVM (HSVM) for dc high-voltage applications. The multiplier is formed by cascading a diode-bridge rectifier and an SVM with diode-bridge rectifier as the first stage of multiplier. The proposed topology saves two high-voltage capacitors and requires only one secondary winding of HVT. Besides, it has lesser voltage drop and faster transient response at start-up, when compared with conventional SVM. The feasibility of the proposed HSVM is validated both by simulation and experimental results of a laboratory scaled-down prototype.
58 citations
"The Cockcroft-Walton voltage multip..." refers background in this paper
...The operation of multiplier fed by a source of sinusoidal voltage is generally known [2]....
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01 Nov 2015
TL;DR: The LLC resonant circuit is utilized to retrieve the energy trapped in the leakage inductance of the transformer and to achieve the zero voltage switching feature, and the input-output responses and the DC characteristics in the frequency domain are obtained.
Abstract: In this paper, a LLC resonant DC-DC converter with voltage multiplier (VM) rectifier is proposed. The proposed converter circuit consists of four main components, which are the full bridge inverter, a resonant tank (LLC), a high voltage transformer, and a high voltage VM circuit. The proposed circuit regulates the output voltages by narrowly varying the switching frequency. The LLC resonant circuit is utilized to retrieve the energy trapped in the leakage inductance of the transformer and to achieve the zero voltage switching feature. The resonant circuit also increases the conversion efficiency. A high voltage transformer is used to step up the AC voltage, and then converted to DC voltage by rectifier. With the equivalent circuit derived based on the first harmonic approximation method, the input-output responses and the DC characteristics in the frequency domain are obtained. The key steady-state waveform and the circuit operation are presented. Finally, an example of the proposed LLC resonant converter with 50V input voltage and 6kV output voltage are simulated and validated by the experimental results.
7 citations
01 Sep 2013
TL;DR: In this paper, the authors proposed a series resonant continuous conduction high voltage inverter fed dc-dc converter with a fourth order resonant tank, designed simply by a parallel combination of an inductor and a capacitor.
Abstract: The high voltage inverter-fed SR dc-dc converter with conventional design surly provides negligible switching losses, but when operated at light loads, contain ripples at the output voltage and end up with poor performance. So in turn, the applications which require wide range of output voltage variation are expressed relatively less suitable for this design. In order to cop up with these limitations this paper proposes a LCCL series resonant continuous conduction high voltage inverter fed dc-dc converter. A fourth order resonant tank has been proposed in this paper, designed simply by a parallel combination of an inductor and a capacitor, adjoining a capacitor in series combination to the leakage inductance of the transformer. Moreover, the parasitic capacitances and inductances of the circuit are incorporated within the resonant tank, therefore; the proposed converter lacks the parasitic oscillations. PSPICE software has been used to simulate the proposed system. Results reveal that the proposed converter gains an upper hand over the conventional series resonant converter as low output voltage ripple over the entire range, wide range of output voltage control and low current stress at light load are offered by the proposed system.
7 citations
Journal Article•
5 citations
"The Cockcroft-Walton voltage multip..." refers background or methods in this paper
...The use of the transformer leakage inductances and the voltage multiplier capacitors during supply by an inverter [7, 8] (without additional resonant circuits) is the subject of this article....
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...9a, and 9b shows the view of the generator and voltage multiplier (with maximal power of 160W) which was used in the installation for electrostatic segregation of bulk materials [8]....
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01 Nov 2017
TL;DR: In this article, the steady state and resonant current analysis of a Forward-Flyback Voltage Multiplier operating in discontinuous conduction mode is presented. And the conditions for the operations modes are obtained.
Abstract: This paper presents the steady state and resonant current analysis of a Forward-Flyback Voltage Multiplier operating in discontinuous conduction mode. The operation stages are approached, taking into account the resonant current. The static gain and the conditions for the operations modes are obtained. A sinusoidal approximation is proposed to represent the resonant current with respect to the number of stages, voltage multiplier capacitors and leakage inductance. The characteristics of voltage sharing among capacitors, that allows the use of small voltage components, and the high-gain with reduced turns of the transformer are verified. Bench tests were made for a 200 V/2000 V prototype, from one to five stages, highlighting the overall circuit effects for a 200 W output power. Obtained waveforms for different number of voltage multiplier stages validate the theoretical and simulated results, making this converter an alternative to isolated DC/DC systems where the output voltage must be higher than the input voltage.
5 citations
"The Cockcroft-Walton voltage multip..." refers methods in this paper
...The use of transformer leakage inductances and voltage multiplier capacitors to generate resonant processes during supply by a forward-flyback converter is described in [6]....
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