US Pat. No. 10,070,547

CONTROL OF ELECTRIC FIELD EFFECTS IN A PRINTED CIRCUIT BOARD ASSEMBLY USING EMBEDDED NICKEL-METAL COMPOSITE MATERIALS

Sparton Corporation, Sch...

1. A sonobuoy system for use in an externally-generated resonant broadband electric field, the system comprising:a perforated cylindrical outer sonobuoy housing having a wall that defines a cavity;
a power supply;
an electrically-initiated device (EID), wherein the EID is part of a launch device or other controlled component of the sonobuoy system; and
a printed circuit board assembly (PCBA), characterized by an absence of an electromagnetic interface shield or a Faraday cage between the PCBA and the externally-generated resonant broadband electric field, wherein the EID, the power supply, and the PCBA are encapsulated within the cavity of the housing, the EID and the PCBA are electrically connected to each other and to the power supply, and the PCBA includes:
a plurality of conductive layers, including a conductive layer in which an electrical current with a predetermined current density is impressed by the broadband electric field falling incident upon the conductive layers, wherein the conductive layers are electrically connected to the EID;
one or more vias connecting the plurality of conductive layers;
a plurality of dielectric layers interposed between the plurality of conductive layers to form a stack-up; and
a trans-conductor layer (TCL) constructed of a nickel-metal composite metamaterial and having a variable geometry along each of a width and a length of the TCL, the TCL being embedded between adjacent ones of the conductive and dielectric layers,
wherein the TCL is configured to change shape, surface roughness, and/or characteristic impedance in the presence of the broadband electric field to thereby redirect the impressed electrical current away from the conductive layers of the PCBA and into at least one of the dielectric layers, and
wherein the at least one of the dielectric layers is configured to dissipate the redirected electrical current and is fabricated with a material configured as a dielectric waveguide that redirects field energy of the electrical current to ends of the PCBA and into the one or more vias, the vias being configured to radiate field energy of the electrical current away from the EID.

US Pat. No. 9,612,085

PAYLOAD LAUNCH SYSTEM AND METHOD

Sparton Corporation, Sch...

1. A payload launch system comprising:
a cylindrical outer launch tube having a longitudinal axis;
a payload;
a rocket tube containing the payload, wherein the rocket tube is contained within the outer launch tube;
a pressurized motor assembly held stationary within the outer launch tube, wherein the pressurized motor assembly includes
a launch actuator and an accumulator housing containing a volume of compressed gas and defining a vent opening having a closure;
and

a control system in communication with the launch actuator;
wherein the control system is configured to transmit a launch actuation signal to the launch actuator in response to a launch
signal to thereby open the closure of the vent opening and thereby cause a discharge of the compressed gas from the actuator
housing into the outer launch tube, thereby translating the rocket tube along the longitudinal axis and launching the rocket
tube from the outer launch tube in a single gaseous thrust phase, such that the pressurized motor assembly remains in the
outer launch tube after launch of the rocket tube.

US Pat. No. 10,090,771

SWITCHING MODE POWER AMPLIFIER WITH LOAD ISOLATION

Sparton Corporation, Sch...

1. A switching mode power amplifier device for delivering power to a load, the switching mode power amplifier device comprising:a first pair of semiconductor switches comprising first and second semiconductor switches each configured to receive a modulated input signal from a modulating circuit, the modulated input signal being comprised of a time-varying analog input signal and a carrier signal having a carrier frequency, the modulated input signal having modulated positive and negative voltage signals respectively corresponding to positive and negative components of the time-varying analog input signal, the time-varying analog input signal changing between the positive and negative components at a zero-voltage crossing of the time-varying analog input signal, wherein a switching rate of the first and second semiconductor switches equals or exceeds the carrier frequency of the modulated input signal;
first and second transformers respectively connected to the first and second semiconductor switches, and respectively receiving the modulated positive and negative voltage signals from the first and second semiconductor switches, the first and second transformers being configured to store energy from the modulated input signal;
a second pair of semiconductor switches comprising third and fourth semiconductor switches that are electrically connected between a respective one of the first and second transformers and the load, wherein a switching state of the third and fourth semiconductor switches changes in response to an output signal indicative of the zero-voltage crossing of the time-varying analog input signal, and wherein a closed/conducting switching state of the third and fourth semiconductor switches transfers the energy stored in the first and second transformers to the load, such that the load is isolated from a switching function of the first pair of semiconductor switches;
a first diode positioned in series between the first transformer and the third semiconductor switch;
a second diode positioned in series between the second transformer and the fourth semiconductor switch; and
a zero-crossing detection (ZCD) circuit in communication with the second pair of semiconductor switches, the ZCD circuit being operable for detecting the zero-voltage crossing of the time-varying analog input signal and for transmitting the output signal indicative of the detected zero-voltage crossing to the third or fourth semiconductor switches.

US Pat. No. 9,841,145

AXIAL PIERCING MECHANISM FOR PRESSURIZED GAS CANISTER

Sparton Corporation, Sch...

1. An axial piercing mechanism for use with a canister containing pressurized gas and having a sealed end, the axial piercing
mechanism comprising:
a housing having a longitudinal axis and first and second ends, the housing defining at least one exhaust port, and further
defining coaxial first and second internal cavities, wherein the second end is configured to receive or couple to the sealed
end of the pressurized gas canister;

an electric motor assembly disposed in the first internal cavity at the first end of the housing;
a pushrod assembly disposed in the second internal cavity and having first and second ends, wherein the first end of the pushrod
assembly is rotatably coupled to the electric motor assembly; and

a lancet coupled to the second end of the pushrod assembly;
wherein the electric motor assembly is configured to translate the pushrod assembly and the lancet along the longitudinal
axis toward the sealed end in response to an input signal to thereby pierce the sealed end and release the pressurized gas
from the gas canister through the at least one exhaust port.

US Pat. No. 10,420,239

CONTROL OF ELECTRIC FIELD EFFECTS IN A PRINTED CIRCUIT BOARD ASSEMBLY USING EMBEDDED NICKEL-METAL COMPOSITE MATERIALS

Sparton Corporation, Sch...

16. A sonobuoy system for use in a body of water exposed to an externally-generated resonant broadband electric field, the sonobuoy system comprising:a sonobuoy housing defining an internal cavity;
a power supply disposed in the internal cavity of the sonobuoy housing;
an electrically-initiated device (EID) disposed in the internal cavity of the sonobuoy housing and electrically connected to the power supply, the EID being configured to activate via an electrical signal; and
a printed circuit board assembly (PCBA) disposed in the internal cavity of the sonobuoy housing and electrically connected to the EID and the power supply, the PCBA including:
a plurality of conductive layers including at least one conductive layer in which an electrical current with a current density is impressed by the broadband electric field falling incident upon the at least one conductive layer;
a plurality of dielectric layer interposed between the plurality of conductive layers to form a stack-up;
a plurality of vias connecting the plurality of conductive layers; and
a trans-conductor layer (TCL) embedded between one of the conductive layers and one of the dielectric layers, the TCL including a nickel-metal composite metamaterial and having a variable geometry along a width and a length of the TCL, the TCL being configured to change shape, size, surface roughness and/or characteristic impedance in the presence of the broadband electric field to thereby redirect the impressed electrical current away from the conductive layers and into at least one of the dielectric layers,
wherein the at least one of the dielectric layers includes a material configured as a dielectric waveguide that redirects field energy of the electrical current to at least one end of the PCBA and into at least one of the vias, the at least one of the vias being configured to radiate the field energy away from the EID.

US Pat. No. 10,973,140

METHOD FOR ASSEMBLING A PRINTED CIRCUIT BOARD ASSEMBLY

Sparton Corporation, Sch...

1. A method for assembling a printed circuit board assembly (PCBA) for controlling an electrically-initiated device (EID) external to the PCBA and exposed to a broadband electric field, the method comprising:assembling a plurality of conductive layers configured to electrically connect to the EID, the plurality of conductive layers including at least one conductive layer in which an electrical current is impressed by the broadband electric field falling incident upon the at least one conductive layer;
positioning a dielectric layer between the plurality of conductive layers to form a stack-up;
connecting the plurality of conductive layers with a via; and
embedding a trans-conductor layer (TCL) between one of the conductive layers and the dielectric layer, the TCL including a nickel-metal composite metamaterial and having a variable geometry along a width and a length of the TCL, the TCL being configured to change shape, size, surface roughness and/or characteristic impedance in the presence of the broadband electric field to thereby redirect the impressed electrical current away from the conductive layers and into the dielectric layer,
wherein the dielectric layer is configured as a dielectric waveguide that redirects field energy of the electrical current to at least one end of the PCBA and into the via, the via being configured to radiate the field energy away from the EID.