United States of America As Represented by the Secretary of the Air Force

Westinghouse Electric Corporation

US Government As Represented by the Secretary of the Army

Northrop Grumman Systems Corporation

Charles S Kerfoot

Walter E Milberger

Franklin B Jones

Patricia A O'Donnell

Joseph J Springer

David L Schantz, Jr

Ngon B Nguyen

Daniel C Buck

William B Hall

Frank E Altoz

Frank A Lindberg

Geoffrey B Lansberry

Thomas C Underwood

James L Munro

Michael J Ankrom

James H DeOms

Ronnie L Starling

Brian H Smith

Ray S Kemerer

Beth A Herman

Eric L Mohler

Richard M Young

Brian A DeAbreu

David E Bulgher

Marshall G Jones

Gene A Digennaro

William B Winkel

Todd M Zaranski

Charles E Carter

Aaron D Valdivia

Frank A Halgas

Louis A Razzetti

Gene A Di Gennaro

An electric vehicle propulsion system having a motor with first and second electrically isolated windings and a system control unit for controlling the motor, wherein the system control unit includes a first power bridge for driving the first windings and a second power bridge for driving the second windings.

Electric vehicle propulsion system employing AC induction motor control

An easy to assemble transformer for use in an electronics module of an electric vehicle. The transformer can be assembled from the 'top down,' thus alleviating the need to build the transformer as a subassembly unit. During manufacture of the transformer, windings are wound onto a thermally conductive coil form. Next upper and lower E-shaped core members are inserted into openings in the top and bottom of the form so that the side legs and the center legs of the E's touch and are in alignment. The thermally conductive coil form has a portion that touches a cold plate when the transformer is mounted on the cold plate. The transformer is further secured to the cold plate by a mounting bracket.

Method of manufacturing heat dissipating transformer coil

An on-board electric vehicle battery charger includes a surge limiter circuit, a power factor control circuit, and a resonant inverter circuit. The power factor control circuit includes a boost regulator circuit providing a fixed voltage on an output capacitor. The resonant inverter circuit uses a resonance capacitor and the leakage inductance of an output transformer to establish a resonance frequency at least 500 times the AC input power frequency.

Electric vehicle battery charger

Heat dissipating transformer coil

In one embodiment, the invention is a packaged high power electronic switch in the form of a semiconductor chip having metalized planar cathode and anode terminals and a gate terminal. A refractory annular ring has planar open end faces and side walls having stepped portions. A pair of thermally and electrically conductive planar substrates is bonded to the opposite end faces of the annular ring and is maintained in spaced relation thereby, forming an enclosed space. At least one conductive strap within the space is supported by the stepped portion of the internal side wall and extends to one of the substrates forming an electrical and thermal path. One of said conductive substrates receives one of the planar terminals of the chip in intimate electrical and thermal contact. The strap is electrically coupled to the other of said terminals, for forming a high current path between the substrates via the strap. Additional components, such as a commutating diode and gate protection zener diode, may be employed and provide a self protected switch assembly.

High power self commutating semiconductor switch

A high-speed high-voltage FET current interrupter which opens the cathode circuit of microwave tubes when internal tube arcing occurs. By removing the detrimental fault current which causes degradation to the microwave tube body and grid, the longevity of the microwave tube and the pulse energy storage capacitor is greatly increased over those transmitters which use dissipative crow bar circuits. Even more important is that the transmitter reset time after an arc occurs is orders of magnitude faster than transmitters using crow bars or primary power interrupters when arcing occurs--an important feature when engaged in a 'dog fight'.

Anti crow bar current interrupter for microwave tube transmitters

The high voltage regulator employs a field effect transistor (FET) amplifier and a shielded wide band frequency compensated RC voltage divider. The device comprises a FET amplifier used as a current source in a 20 KV power supply. The negative output of the supply is sensed by the voltage divider consisting of two resistors in parallel with two capacitors for frequency compensation. The voltage divider output is applied to the non-inverting input of an operational amplifier whose reference is set to affect the linear operation of an inverting operational amplifier. In the voltage divider, a variable high voltage quartz glass piston capacitor is used to set the RC product of the high level arm equal to that of the low level arm.

Voltage divider for a wide band domino effect high voltage regulator

A high power, high frequency inverter has series/parallel resonant inverter elements and employs MOS controlled thyristors (MCTs) in the switching circuit. The resonant inverter elements include a split inductor for reducing peak voltage across the switches. A fault protection circuit cause the power interruption for a short interval before restarting the circuit. High current density is achieved by means of multilayer ceramic chip capacitors and gap ferrite planar inductors.

High power, high frequency resonant inverter using MOS controlled

The high voltage regulator employs a field effect transistor (FET) amplifier and a wide band frequency compensated RC voltage divider. The device comprises a FET amplifier used as a current source in a 20 KV power supply. The negative output of the supply is sensed by a voltage divider consisting of two resistors in parallel with two capacitors. The voltage divider output is applied to the non-inverting input of an operational amplifier whose reference is set to affect the linear operation of an inverting operational amplifier. A no load to full load and line regulation of 0.1% is provided to a microwave tube. For a 16-KV regulated output the inverting amplifier must have a dc operation point of 4 KV to accommodate a 20% storage capacitor voltage droop and a .+-.5% line change. At this level the inverting amplifier provides a swing of .+-.4 KV. This range allows for a large line voltage variation and storage capacitor voltage droop. The dynamic range and bandwidth of the regulator not only provides regulation for long term line voltage regulation but also negates the effects of line voltage transitions over a wide frequency and amplitude range.

Wide band domino effect high voltage regulator

A cascode radio frequency amplifier in which a control amplifier stage is provided and any number of clone amplifier stages are connected in series (cascode) with the control amplifier. The cascode amplifiers provide equal voltage and power since each of the clone stages provides unity gain. The device can operate from low frequencies to high frequencies.

Multistage cascode radio frequency amplifier

A high voltage pulse regulator which is capable of measuring and correcting voltage perturbations on the top of a high voltage square wave pulse is disclosed. The regulator uses: a rectifying diode, an oscilloscope, a variable zener diode, a variable biasing current source and pulse capacitor. The rectifying diode receives and rectifies the high voltage square wave pulse from a high voltage pulse source to produce a rectified square wave pulse. The rectified square wave pulse is received and regulated to a voltage level acceptable to the oscilloscope by the variable zener diode pulse capacitor, and current source, which are connected together in a parallel circuit and act as follows. The variable zener diode is activated by the biasing current. Therefore, when there is no biasing current, the pulse capacitor and rectifying diode act as a peak detector, and the high voltage square wave pulse is adjusted down within a threshold of detection by the oscilloscope, when a bias current is applied to the variable zener diode, a threshold detector is established which permits the top of the pulse to be viewed on the oscilloscope display.

Precision high voltage FET pulse sense and clamp apparatus statement of

This high voltage linear FET amplifier operates at voltage levels of ten's of thousand's of volts with power dissipation capabilities in the kilowatt range. It is a broadband device which features power amplification from DC to frequencies well in excess of 100 KHz. The amplifier uses a unity-gain inverting amplifier as its basic building block. N-number of these building blocks are stacked to accommodate whatever voltage stand-off level is desired. To operate stacked high voltage amplifiers, it is necessary to provide a bias shift (reference) progressively increasing in equal increments from the ground reference stage to the highest voltage level stage while preserving the fidelity of the signal applied to the first stage. This is done by establishing a phantom ground at all amplifiers for each progressive bias level.

Domino effect amplifier

A High Voltage Regulation apparatus which uses an amplifier having an arbitrarily large number of stacked MOSFETs to provide low impedance shunt regulation with a 'domino effect'. Voltages of many kilovolts can be conveniently regulated. voltage sharing among the devices is assured by the domino arrangement. External capacitances are added to optimize low impedance voltage regulation, including an external capacitor connected between the drain and gate of each stage to equalize the drain to gate and gate to source capacitances. There may also be an external capacitor connected between the drain and source of each stage to provide low amplifier impedance at high frequency, or a lumped external capacitor connected across the entire amplifier string, to provide low amplifier impedance at high frequency. The amplifier uses a unity-gain inverting amplifier as its basic building block. N-number of these building blocks are stacked to accommodate whatever voltage stand-off level is desired.

Domino effect shunt voltage regulator

The light weight non-saturating spaced core inductor that is made of altete layers of magnetic and light weight non-magnetic materials to provide a structure that is light in weight yet has the non-saturating inductor characteristics required for certain circuits that are subject to over-load.

Light-weight non-saturating spaced core inductor

A high-voltage FET pulser for a synthetic aperture radar transmitter includes an FET ON switch and a tail biter switch both on the floating deck and coupled to a pulse driver circuit through a transformer having a quartz glass tube isolating the secondary winding from the core and primary winding. An active shunt regulator circuit is connected to the output of the FET ON switch to provide a flat output pulse free of ringing.

Growing community of inventors

Pasadena, MD, United States of America

Charles S Kerfoot