A semiconductor switching device of field-drive type includes a bipolar component having a pnp transistor portion (8) and a npn transistor portion (9), said pnp transistor portion (8) and said npn transistor portion (9) being connected to cause a positive feedback, and a n-channel MOS transistor (11) connected across an emitter electrode (n3) and a collector electrode (n2) of said npn transistor portion (9), wherein a p-channel MOS transistor (10) is connected across an emitter electrode (p1) and a connector electrode (p2) of the pnp transistor portion (8), and a control terminal of said n-channel MOS transistor (11) is electrically connected with a control terminal of said p-channel MOS transistor (10). Said device is operable to control the main drive section even in the floating state and to drive the main drive section by a small control current.

Semiconductor switch circuit

Solid state optically coupled power switch with light induced or modified voltage applied or removed at one or more MOSFET gate and source electrode pairs to shift each MOSFET between its high and low impedance states and in various circuit arrays for ac or dc switching and/or cross points switching or mechanical Form C relay substitution or other purposes

Solid state optically coupled electrical power switch

Improved solar sensor and tracker apparatus is described in which an extremely low cost high angular accuracy sensor and tracking device utilizing a symmetrical sensor shade and sensor arrangement is described. An improved circuit control for electric motor drive of the tracker apparatus is also described in which a relatively high speed track operation followed by a relatively slow speed homing in motion is automatically provided by the control circuit driving the electric motors.

Solar sensor and tracker apparatus

A thyristor device comprising an SI (Static induction) thyristor or beam base thyristor and an SIT (static induction transistor) or SIT-mode bipolar transistor connected to the gate of the thyristor in order to make it possible to turn-on and-off a direct current and voltage at a high speed with a light. In the thyristor part, the SIT gate structure or SIT-mode beam base structure exists in the first gate or base region or second gate or base region so that, at the time of the triggering operation, a very high switching efficiency will be obtained.

Light quenchable thyristor device

The disclosure relates to a method and system for coupling semiconductor components on a single semiconductor chip or wafer without providing the possibility for short circuits and/or capacitances between metallization layers where connections between one set of components via metallization must pass across the path of connections via metallization to other sets of components. This is accomplished by providing a light conducting path in the semiconductor chip or wafer, such as in the form of a silicon dioxide layer path between the elements to be coupled. A device is provided in the coupling path which is capable of passing a light beam to the elements themselves for activating them, the elements being activated by light impinging on them. The elements are light responsive for actuation, or actuated electrically by another adjacently located light responsive element. The device for providing the light can be a light emitting diode which is externally controlled, a set of mirrors which reflect light from an external laser beam or any other system capable of providing light. The light travels through the silicon dioxide layer which has the properties of a light pipe and will actuate all light responsive semiconductor devices in the crystal to which the path of silicon dioxide is connected. There is no short circuit or stray capacitance problem due to elimination of at least part of the metallization.

Light projection coupling of semiconductor type devices through the use of thermally grown or deposited SiO{HD 2 {B films

A solid state relay coupled to provide current flow to a load from a high voltage source provides high isolation between the relay''s output terminals and an input control gate by means of a photo transistor coupled pair and a photo silicon controlled rectifier coupled pair connected in series circuit for response to the input control gate and by means of an output transistor responsive to the series circuit for providing a current path from the high voltage source through one output terminal, the collector-emitter path of the output transistor and to a load via the other output terminal.

Marinkovic Zoran

Papers

Solid state relay using photo-coupled isolators