A 180-V Si-gate MOS transistor using standard MOS LSI technology and capable of driving piezoelectric tactile displays has been developed. A novel theory predicts accurately walkout of the transistor's high-voltage junction breakdown.
Physics, Gate turn-off thyristor, Engineering, business.industry, Voltage control, Circuit design, Transistor, Thyristor, MOS-controlled thyristor, Blocking (statistics), Industrial and Manufacturing Engineering, law.invention, Power (physics), Integrated gate-commutated thyristor, Control and Systems Engineering, law, Control theory, Electronic engineering, Electrical and Electronic Engineering, business, Voltage, Electronic circuit
Abstract
Designers of high-power circuits have not previously been able to quantitatively estimate the design tradeoffs which are available between the blocking voltage, current density, and turn-off time of a thyristor. In this paper, a new tradeoff relationship is derived by combining simple relationships from well-known device theory. The constants in this relationship are empirically adjusted to correlate with present commercial thyristors. The relationship shows that for a given turnoff time there is a corresponding blocking voltage which allows a given thyristor size to control the maximum load power. It also shows the penalties involved for other choices of these ratings. Generalized plots will help the circuit designer to more fully understand the interaction of device tradeoffs and circuit tradeoffs. The relationship emphasizes the thermal basis for current ratings, and also provides an objective means for comparing various thyristors.
Digital computer, Atmospheric pressure, Chemistry, Ionization, Voltage control, Photoionization mode, Photoionization, Radiation, Atomic physics
Abstract
For some time it has been recognized that in the Townsend mechanism of breakdown, radiation is the only mechanism that appears to be fast enough to account for the speed of breakdown. Considerable attention has been directed to photoemission but this has been unable to account for observed phenomena. Recently data1 has been obtained which makes it possible to make quantitative determinations of photoionization. This paper describes calculations made using a digital computer to apply the available data on photoionization to the Townsend breakdown of gaps of the order of 1 cm at atmospheric pressure.
Physics, Signal processing, Electric power transmission, business.industry, Transmission line, Voltage control, Electronic engineering, Electrical engineering, Pulse amplifiers, Linearity, business, Capacitance
Published
1966
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