Abstract: A helmet is provided having one or more layers of foam forming a first helmet shell nested inside a second helmet shell. Left and right circular ear openings are positioned on opposing sides of the first helmet shell and on opposing sides of the second helmet shell. A faceguard is attached to the first and second ear opening at opposing sides of the second helmet shell and a right ear hole anchor and a left ear hole anchor, each have an inside surface and an outside surface. One each of the ear hole anchors attach to the first and second circular ear openings of the second helmet shell at their inside surface and a first end of the faceguard attaches to the outside surface of the right ear hole anchor and a second end of the faceguard attaches to the outside surface of the left ear hole anchor.

Abstract: An electric current sensor for detecting a leakage current from an electric vehicle charger. The current sensor includes a magnetic core having a gap formed therein, a first conductor wound around the magnetic core to form a first coil, a second conductor wound around the magnetic core to form a second coil, and a tunnel-magnetoresistance (TMR) sensor element arranged in the gap of the magnetic core. A difference between electric current flow in the first and second conductors produces a magnetic field in the gap of the magnetic core proportional to a leakage current, and the magnetic field produces a voltage in the TMR sensor element indicative of a value of the leakage current.

Abstract: An electric current sensor for detecting a leakage current from an electric vehicle charger. The current sensor includes a magnetic core having a gap formed therein, a first conductor wound around the magnetic core to form a first coil, a second conductor wound around the magnetic core to form a second coil, and a tunnel-magnetoresistance (TMR) sensor element arranged in the gap of the magnetic core. A difference between electric current flow in the first and second conductors produces a magnetic field in the gap of the magnetic core proportional to a leakage current, and the magnetic field produces a voltage in the TMR sensor element indicative of a value of the leakage current.

Abstract: A helmet is provided having one or more layers of foam forming a first helmet shell nested inside a second helmet shell. Left and right circular ear openings are positioned on opposing sides of the first helmet shell and on opposing sides of the second helmet shell. A faceguard is attached to the first and second ear opening at opposing sides of the second helmet shell and a right ear hole anchor and a left ear hole anchor, each have an inside surface and an outside surface. One each of the ear hole anchors attach to the first and second circular ear openings of the second helmet shell at their inside surface and a first end of the faceguard attaches to the outside surface of the right ear hole anchor and a second end of the faceguard attaches to the outside surface of the left ear hole anchor.

Abstract: A pressure attenuating helmet is provided including separate plates having a plate thickness, an outer surface, under surface, and adjacent edges. The plates joined along the adjacent edges to the other ones of the plurality of plates, forming a helmet shell. Perforated flanges formed along the under surface at the adjacent edges of the plates, the flanges formed inwardly along a line from the adjacent edge of each of the plates extending in the direction of the thickness of the plates. Perforation in the flanges spaced equidistantly in an array along a long direction of the flanges, enabled to accept sutures and aligned flange-to-flange. A network of elastomer splines shaped and positioned to separate the adjacent plates both along the adjacent edges and the perforated flanges. Sutures through the perforations securing the plates together along the adjacent edges and foam cushions are provided between the plates and a wearers head.

Abstract: A wireless charger output protection system and method is provided for protecting a battery in an electric vehicle during wireless charging. A wireless power transfer system includes a wireless charger on the electric vehicle side that receives power wirelessly from a charging base. The wireless charger output protection system and method shuts down the wireless charger output and dumps energy in a receive antenna (e.g., a vehicle pad) when a charging error is detected before the charging base can be shut down. The system and method employs a zero-voltage switching (ZVS) scheme to shut down the wireless charger output, in response to the charging error, to protect the switching devices and enhance overall reliability.

Abstract: A wireless charger output protection system and method is provided for protecting a battery in an electric vehicle during wireless charging from both a desired power source and a stray power source. A wireless power transfer system includes a wireless charger on the electric vehicle side that receives power wirelessly from a charging base. The wireless charger output protection system and method shuts down the wireless charger output and dumps energy in a receive antenna (e.g., a vehicle pad) when a low-voltage battery connected to the wireless charger is lost. The wireless charger output protection system and method also shuts down the wireless charger output and dumps unwanted energy in the receive antenna (e.g., a vehicle pad) when power is transferred from a stray power source coupled to the receive antenna.

Abstract: A wireless charger output protection system and method is provided for protecting a battery in an electric vehicle during wireless charging. A wireless power transfer system includes a wireless charger on the electric vehicle side that receives power wirelessly from a charging base. The wireless charger output protection system and method shuts down the wireless charger output and dumps energy in a receive antenna (e.g., a vehicle pad) when a charging error is detected before the charging base can be shut down. The system and method employs a zero-voltage switching (ZVS) scheme to shut down the wireless charger output, in response to the charging error, to protect the switching devices and enhance overall reliability.

Abstract: A wireless charger output protection system and method is provided for protecting a battery in an electric vehicle during wireless charging. A wireless power transfer system includes a wireless charger on the electric vehicle side that receives power wirelessly from a charging base. The wireless charger output protection system and method shuts down the wireless charger output and dumps energy in a receive antenna (e.g., a vehicle pad) when a charging error is detected before the charging base can be shut down. The system and method employs a zero-voltage switching (ZVS) scheme to shut down the wireless charger output, in response to the charging error, to protect the switching devices and enhance overall reliability.

Abstract: A wireless charger output protection system and method is provided for protecting a battery in an electric vehicle during wireless charging from both a desired power source and a stray power source. A wireless power transfer system includes a wireless charger on the electric vehicle side that receives power wirelessly from a charging base. The wireless charger output protection system and method shuts down the wireless charger output and dumps energy in a receive antenna (e.g., a vehicle pad) when a low-voltage battery connected to the wireless charger is lost. The wireless charger output protection system and method also shuts down the wireless charger output and dumps unwanted energy in the receive antenna (e.g., a vehicle pad) when power is transferred from a stray power source coupled to the receive antenna.

Abstract: A wireless charger output protection system and method is provided for protecting a battery in an electric vehicle during wireless charging. A wireless power transfer system includes a wireless charger on the electric vehicle side that receives power wirelessly from a charging base. The wireless charger output protection system and method shuts down the wireless charger output and dumps energy in a receive antenna (e.g., a vehicle pad) when a charging error is detected before the charging base can be shut down. The system and method employs a zero-voltage switching (ZVS) scheme to shut down the wireless charger output, in response to the charging error, to protect the switching devices and enhance overall reliability.