Abstract: A flyback converter high voltage power supply which includes two switches operating in push pull fashion to provide alternate polarity energy pulses to a load. A main component of the power supply is a transformer, the primary winding of which is divided into halves. The secondary may be also be split into halves, or may be configured without a split so long as the secondary and rectifier combination result in full wave rectification. The first of the two switches couples an input voltage across the first primary half to store energy in the magnetic core during a first time interval, and at the end of the first time interval disconnects the first primary half from the input voltage. During a second time interval, the energy stored in the magnetic core during the first time interval is delivered to the load via the secondary winding.

Abstract: A DC-AC converter circuit for a power supply contains a parallel resonant circuit topology. Accordingly, stray capacitance associated with the converter forms a part of the resonant circuit and assists in setting the resonant frequency thereof. The energy in the stray capacitance which is normally lost is recovered by the resonant circuitry. A coupled inductor is connected in series with a primary winding of an output transformer of the converter. The coupled inductor includes a resonating inductor winding and an energy recovery winding which are tightly wound out of phase with one another. Energy from the resonant inductor winding is coupled to the recovery winding when the switching elements of the converter are switched on and off. Therefore, energy otherwise dissipated in switching operation is conserved by being returned to its source. Further, the switching elements of the converter are connected in series through diodes to the return line.

Abstract: A metal base plate has two spaced thermally conductive ceramic bars fixed to one surface. The outwardly facing surface of the bars has spaced conductive pads. A plurality of diodes which are of alternating opposite polarity have axially extending leads extending between the bars in spaced parallel relationship with respect to one another, and are soldered to the conductive pads on the bars to define a series connection of the diodes. The suspended diodes and their leads are then encapsulated in a body of polymerizable material containing thermally conductive electrically insulative particles suspended therein such that the particles occupy more than about 75% of the encapsulating mass.

Abstract: A resonant current-driven power source is disclosed. Preferably, the power source is a DC to DC converter regulator including a inductor and capacitor electrically coupled to one another and an input inverter which converts an input DC voltage into an AC voltage having substantially no DC component and applies the AC voltage across an LC circuit in a manner which causes the inductor and capacitor of the latter to resonate with one another whereby an AC voltage appears across the capacitor. An output circuit converts the AC voltage appearing across the capacitor into a DC output voltage. A control circuit is provided for controlling the operation of the inverter circuit in a manner which controls the magnitude of the output voltage. The inverter circuit also includes a step-up transformer for increasing the magnitude of the AC voltage across the LC circuit to a value many times greater than the input DC voltage.

Abstract: A high voltage power supply for a capacitive load switches between two different voltages of the same polarity relative to ground within about 15 microseconds and is useful as the switching supply for beam penetration cathode ray tubes in short range radar systems. The power supply comprises two power supplies of different voltages which are selectively connected to an output capacitive load. The lower voltage supply is connected directly to the load through a low voltage clamping diode. The higher voltage power supply is connected in series with an inductor, which is, in turn, connected to the load through an up-switch circuit which is closed to increase the power supply output voltage to an upper level and a down-switch circuit which is closed to reduce the power supply voltage to a lower level. Each switch consists of one or more transistors in series with a switching diode.

Abstract: A low light level camera includes a plurality of identical modular-type intensifier assemblies which are removably clamped together, and are connected in electrical parallel with one another. The intensifier assembly is axially movable with respect to the camera frame and lens for focus adjustment.