Compact High-voltage Power Supply Research Articles

Development of Compact High-Voltage Power Supply for Stimulation to Promote Fruiting Body Formation in Mushroom Cultivation.

The compact high-voltage power supply is developed for stimulation to promote fruiting body formation in cultivating L. edodes and Lyophyllum deeastes Sing. mushrooms. A Cockcroft-Walton (C-W) circuit is employed to generate DC high-voltage from AC 100 V plug power for the compact, easy handling and high safety use in the hilly and mountainous area. The C-W circuit is connected to high-voltage coaxial cable which works for high-voltage transmission and for charging up as energy storage capacitor. The output voltage is around 50 kV with several microseconds pulse width. The dimension and weight of the developed power supply are 0.4 × 0.47 × 1 m3 and 8.1 kg, respectively. The effect of the high-voltage stimulation on enhancement of fruiting body formation is evaluated in cultivating L. edodes and Lyophyllum deeastes Sing. mushrooms using the developed compact high-voltage power supply. The conventional Marx generator is also used for comparison in effect of high-voltage stimulation for fruiting body formation. L. edodes is cultivated with hosting to natural logs and the pulsed high voltage is applied to the cultivated natural logs. The substrate for Lyophyllum deeastes Sing. cultivation consists of sawdust. The results show that the fruiting body formation of mushrooms of L. edodes for four cultivation seasons and that of Lyophyllum deeastes Sing. for two seasons both increase approximately 1.3 times higher than control group in terms of the total weight. Although the input energy per a pulse is difference with the generators, the improvement of the fruit body yield mainly depends on the total input energy into the log. The effect for promotion on fruiting body formation by the developed compact high-voltage power supply is almost same that by the conventional Marx generator.

Compact, high voltage power supply for the lab-on-a-chip.

The design, construction and operation of a simple, inexpensive and compact high voltage power supply (HVPS) for use in conjunction with a simple cross capillary electrophoresis microchip is presented. The microchip HVPS utilizes a single high voltage power supply (15 kV), a voltage-divider network, to give the voltages necessary to operate a gated injection valve, and two high voltage relays for switching between the open and closed gate sequences of the injection. In order to accommodate the application of different simple cross microchip dimensions, a set of equations for defining the resistor network and ensuring proper gate performance are presented.

A Compact High-Voltage Power Supply for an Accelerating Installation

A compact high-voltage power supply for an accelerating installation that uses high-frequency (25 kHz) voltage conversion is described. The power supply provides a variable voltage of 5 to 100 kV at a load current of up to 250 μA and three independently variable voltages of 0–100 V (100 mA), 0–2000 V (5 mA), and 1–15 kV (50 μA), which are required for operating the cold-cathode ion source used in the installation. The output-voltage ripple is <0.05%. The power-supply efficiency is no less than 70%.

A compact high voltage power supply for the LNL recoil mass spectrometer

A compact high voltage power supply has been developed in order to be used on the electrostatic deflectors of the recoil mass spectrometer installed at the Laboratori Nazionali di Legnaro, which needs an operational voltage up to ± 225 kV on each plate ( ΔV = 450 kV) with ripple ≤ 1‰ and long term ( ≥ 8 h) stability better than 1‰. The power supply, which fully meets the above specifications, consists of a HV multiplier and a radio-frequency driver; the multiplier is housed directly inside the high voltage ceramic feedthrough which has dimensions of 40 cm (length) × 20 cm Ø, insulated with SF 6 gas at 2 bar pressure (absolute). Results obtained in a test setup are discussed together with the first performances of two power supplies mounted on the spectrometer.