Cockroft-Walton Voltage Multiplier Research Articles

Comparative study of vibration energy harvesting on home appliances using piezoelectric energy harvester

This project was developed to harvest vibration energy using a piezoelectric energy harvester. The availability of home appliance vibration energy is a promising solution to get clean energy resources to manipulate wasted energy. When the appliances’ vibration hits the piezoelectric energy harvester surface, pressure is applied to the piezoelectric transducers and converts mechanical energy into electrical energy. The piezoelectric energy harvester’s efficiency depends on the availability of the home appliances’ vibration energy; thus, using multiple piezoelectric transducers in series generates more power. The piezoelectric’ alternating current (AC) output is fed to a Cockroft-Walton voltage multiplier (CWVM) to convert into direct current (DC) and boost the output. Four piezoelectric transducers connected in series have successfully produced a voltage of up to 4.7 V. Its output voltage can be harnessed to power low-voltage electronic devices.

5V to 6kV DC-DC Converter Using Switching Regulator with Cockcroft-Walton Voltage Multiplier for High Voltage Power Supply Module

Background: This paper describes the design of 5 V to 6 kV DC-DC converter by using a switching regulator with Cockroft-Walton (C-W) voltage multiplier for a high voltage power supply module. Methods: The proposed design consists of Pulse Width Modulation (PWM) controller circuit, voltage multiplier, and feedback signal. A single unit of 5 V input triggers LT1618 controller circuit to generate 20 V which then produces 300 V from LT8331 output that is connected to diode-capacitor multiplier circuit to achieve final 6 kV. A negative feedback signal is required to stabilize an output voltage. With the implementation of C-W voltage multiplier technique, the output is boosted up as required from the input signal voltage 5 V DC. Results: The LTspice simulation results indicate that the proposed DC converter can generate 6.20 kV. Line regulation of 17 % and the load regulation of 14 % are obtained based on the proposed design. Conclusion: The proposed design is suitable for high voltage power supply module.

Abatement of NOX using compact high voltage pulse power supply: Towards retrofitting to automobile vehicle

The research work in this paper is based on generation of high voltage pulses using compact power supply sources for abatement of NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> from the diesel engine exhaust. The high voltage source is made up of zero voltage switch cascaded with flyback converter to produce high voltage AC, a Cockroft-Walton voltage multiplier to generate high voltage DC and a rotary spark gap for the production of high voltage pulses of rise time in the range of nano seconds. The rectifier based power supply is validated by a 12 V battery supply. To corroborate the feasibility of proposed methodology in diesel operated vehicles, the experiments are conducted with a 12 V battery. Performance of various shapes of electrodes (cylindrical 5mm diameter, square 5 mm diagonal and hexagonal with vertex to vertex diameter of 5 mm) at different flow rates of 2 l/min, 4 l/min and 6 l/min are also examined.

Improvement in the modelling of a half-wave Cockroft-Walton voltage multiplier

Formulae giving the voltage drop of a Cockroft-Walton voltage multiplier are derived using a thorough analysis of the circuit. They differ from standard formulae found in the literature. We show that these new analytical expressions give improved results compared to both numerical simulations and experimental data.

WI-FI ENERGY HARVESTER FOR LOW POWER RFID APPLICATION

In recent years, active Radio Frequency Identiflcation (RFID) tags have crossed into ultra low power domain. With obvious advantages over passive tags, a setback for active tag growth is the need for battery replacement and limited operational life. Battery life could be extended by scavenging surrounding Wi-Fi signals using rectenna architecture which consists of a receiving antenna attached to a rectifying circuit. A seven stage Cockroft-Walton voltage multiplier optimized for low input power (below 0dBm) is proposed. Prototype was fabricated on RT/Duroid 5880 (RO5880) printed circuit board (PCB) substrate with dielectric constant and loss tangent of 2.2 and 0.0009 respectively. Experimental results show that 2V output voltage can be harvested from an operating frequency of 2.48GHz with i9dBm (0.13mW) sensitivity with 1.57mm board thickness.

Using the Cockroft-Walton voltage multiplier with small photomultipliers

A variation of the basic Cockroft-Walton (C-W) voltage multiplier circuit design may be used to generate multiple voltages at sufficient currents to drive the dynodes of a photomultiplier tube. In a battery-operated handheld device, the current draw on the batteries must be kept to a minimum. Several other parameters must be considered carefully during the design as well. Components must be chosen based on size restrictions, expected load current, expected output voltage range, and the maximum allowable ripple in the output voltage. A prototype surface mount C-W board was designed and tested to power two photomultipliers. The whole system, including the detectors, draws less than 15 mA of supply current with the outputs at 1000 Vdc.

Generalised Cockcroft-Walton voltage multipliers

The letter suggests how a Cockroft-Walton voltage multiplier can be generalised to be driven by multiphase square waves.

A new design for a Cockcroft-Walton voltage multiplier using silicon diffused-junction rectifiers

The note describes a Cockroft-Walton voltage multiplier in which silicon diffused-junction rectifiers are used instead of selenium rectifiers. The small physical size of these rectifiers and the particular manner in which the various components are mounted in the generator combine to form a convenient and compact design which is an improvement on the conventional design using selenium rectifiers. It is the novel arrangement of components made possible by the use of silicon rectifiers which is the original feature of this generator.