Author: Mr Essay Hero

Short specification The following is introduction to the material, and also a brief outline of the specifications that guided the development and have been largely exceeded or met. The emphasis is on the dynamic characteristics combined with high power. The main specifications are as follows: Average output power: 100 kW in an output voltage range… Continue reading Pulsed Power Sources Short specification.

Key technology The dc HV power supplies are built around a modular HV converter. All converter modules M1 −MN are fed from a common input rectifier (IR). The modules comprise inverters INV1−INV N feeding HV transformers T1 −TN that feed voltage multipliers R1 −R N having M multiplication stages, which voltages are summed by their… Continue reading Pulsed Power Sources Key technology.

Ripple suppression Let us define the ripple suppression factor K as the ratio of the ripple of the HVPS comprising N modules operating in phase V Nns to that having N phase-shifted modules VNs. The ripple can be considered as the p-p voltage of the HF ac component or can be represented in percent of… Continue reading Pulsed Power Sources Ripple suppression.

Individual module design The converter cells are centered around half-bridge energy dosing resonant quasi inverters see Figure 3. The principle, theory of operation, benefits, and shortcomings were described elsewhere, and we do not expand the description here. The inverters operate at approximately 50 kHz at full load with virtually zero switching losses. The leakage inductance… Continue reading Pulsed Power Sources Individual module design.

Control The control board is based around FPGA. It provides advanced digital processing capabilities and standard operating features, along with the easiness of accommodating application-specific requirements. The standard features include multiple protections which include arc or spark, overheat of the major components, overcurrent and overvoltage, etc. and means of current and voltage. The output regulation… Continue reading The control board based around FPGA.

Measurement means and experimental methods For the HF current measurement, specialty workshop-made current transformers with a sensitivity of 0.01 V/A  and Rogowski probes of PEM make, model CWT15, were used (Neau, E. L,1994). The latter were also used for the CC1 calibration. A standard high-precision Spellman voltage divider model HVD100 served for the HVDC measurement.… Continue reading Measurement means and experimental methods.

Single module tests Generally waveforms  indicate good resonant switching with no shoot-through currents in the full range of the line input voltages, and fair agreement with PSpice simulations. In this and the following figures, the inset notes indicate test conditions, types of the probes used, vertical and horizontal resolutions, etc. The primary winding was divided… Continue reading Pulsed Power Sources Single module tests.

Dc HV power supplies (HVPS) tests Dc HV power supplies are assembled on a chart in a laboratory. The dc HV power supplies comprise of three main units: a circuit breaker protected line rectifier which is the heaviest unit, a hermetically sealed oil-filled HV tank and an inverter section. The oil filled HV tank weighs… Continue reading Dc HV power supplies (HVPS) tests summary.

Nominal line voltage: 400 VAC. The HVPS was extensively tested with resistive loads. Figures 5 above and 6 below show generally phase-shifted primary winding currents (halved) for 100- and 50-kW operations, respectively. The oscillations after the main current surge are generated by the resonance between the leakage inductance and parasitic capacitance of the transformers. Note… Continue reading Nominal line voltage: 400 VAC.