Punch-through current

The gates of the MOSFET must be preeisely driven. If the gates turn off too slowly, then a punch-through current ean oeeur between power switeh MOSFET and the synehronous reetifier MOSFET This is where both the MOSFET are momentarily eondueting at the same time. This unrestrieted eurrent would add to the losses and quiekly lead to a failure. Figure 3-31 shows the eritieal periods in the operation of the synehronous reetifier. 

Effects of space charges (finite e). It is expected that the inclusion of space charges will eliminate current saturation (limiting currents) at the lower and middle branches. These branches are instead expected to meet at another turning point, due to punch through (in this purely electro-diffusional formulation without source terms).5... 

White phosphorus filled munitions are a major item in the current Army demilitarization inventory. Ammunition Equipment Office engineers are developing methods to punch a sized hole into the white phosphorus filled munition to control the rate at which burning occurs when the munition is processed through the deactivation furnace. By controlling the burning rate, the... 

The droplet cell. Fig. 2(d), has uniform current distribution and shrunken dimensions that allow resistive electrolytes to be used [5]. This approach was developed for the use of pure water as an electrolyte as a means to mimic atmospheric corrosion, but it can be used with any electrolyte. An area of a flat sample is exposed through a hole in a piece of protective tape. Electroplater s tape is a very resistant tape with good adhesion that is useful for this and other masking applications in corrosion. If the hole in the tape is made with a round punch, the same punch can be used to make circular dots from pieces of filter paper. One such dot is placed securely into the exposed hole. A small (typically 10-20 gl) droplet of soluhon is placed on the filter paper using a calibrated pipette. This wet filter paper acts as the electrolyte. A piece of woven Pt mesh is placed on top of the wet filter paper, and a reference electrode is held against the back of the Pt counterelectrode. As mentioned, the small dimensions allow the use of even very pure water. This simulates atmospheric corrosion, in which a thin water layer forms on the surface. As in atmospheric corrosion, soluble species on the sample surface and pollutant gases in the air are dissolved into the water droplet, which provides some conductivity. This technique has been used... 

At the macroscopic scale, punching is a common method of producing holes in thin materials. Since both punching and hot embossing involve similar actions, it seems reasonable to attempt to combine the two processes. In the current study, a mated tool pair with punch and die features is demonstrated. The tool pair can be used in a conventional embossing machine such as that described in [9]. The through-holes are punched in 525 xm thick Clarex PMMA produced by Astra Products. 

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