Abstract: A circuit (100) is provided that is connectable between input lines (150, 152, 154) and output lines (160, 162). The circuit is comprised of a primary battery (103) and a hold-up battery (101). The hold-up battery is connected in parallel with the primary battery. The circuit is further comprised of an RC circuit (180) connected in parallel with the primary battery and is isolated from the hold-up battery by unidirectional current valves (108, 110). A comparator is provided with a first input (130) coupled to the RC circuit and a second input (132) coupled to a voltage reference. A switching device (104) is provided that is controlled by an output of the comparator. The switching device connects the hold-up battery to output lines in a first state and disconnects the hold-up battery from output lines in a second state. The unidirectional current valves prevent reverse leakage current from the hold-up battery from charging a capacitor during a discharge period of the RC circuit.

Abstract: A circuit (100) is provided that is connectable between input lines (150, 152, 154) and output lines (160, 162). The circuit is comprised of a primary battery (103) and a hold-up battery (101). The hold-up battery is connected in parallel with the primary battery. The circuit is further comprised of an RC circuit (180) connected in parallel with the primary battery and is isolated from the hold-up battery by unidirectional current valves (108, 110). A comparator is provided with a first input (130) coupled to the RC circuit and a second input (132) coupled to a voltage reference. A switching device (104) is provided that is controlled by an output of the comparator. The switching device connects the hold-up battery to output lines in a first state and disconnects the hold-up battery from output lines in a second state. The unidirectional current valves prevent reverse leakage current from the hold-up battery from charging a capacitor during a discharge period of the RC circuit.

Abstract: A tamper-evident and/or tamper-resistant electronic module comprising an electronic component embedded in an encapsulant material and at least one thin sheet of frangible material contacting and overlying said encapsulant material and overlying said component, said sheet being sufficiently thin that it is likely to crack or break if an attempt is made to drill or cut through it with a laser drill.

Abstract: A tamper evident electronic module comprises an electronic component, a tamper evident sheet, and encapsulant material. Said component is encapsulated in the encapsulant material and the sheet overlies the component, and the sheet comprises a flexible multi-layer sheet, a plurality of the layers of the sheet being selected from the group below: (i) an electromagnetic radiation shield layer; (ii) a tell-tale electrically conductive trip wire defining a convoluted meandering pathway on the layer, the trip wire meandering in a pattern which substantially covers the electronic component in a space filled area if the layer; (iii) a layer having the features of (ii), and in which the pathway comprises a fractual pattern; (iv) a layer having the features of (ii), and in which a second tell-tale trip wire extends alongside a first tell-tale trip wire so that they meander as a spaced pair. (v) an active electromagnetic marking layer adapted to emitt electromagnetic radiation.

Abstract: An RF power supply that is capable of tracking rapid changes in the resonant frequency of a load and capable of quickly responding to varying load conditions so as to deliver the desired amount of power. The present invention also provides an RF power supply capable of delivering a wide range of power over a broad frequency range to a load that is remotely located from the power supply.

Abstract: An RF power supply that is capable of tracking rapid changes in the resonant frequency of a load and capable of quickly responding to varying load conditions so as to deliver the desired amount of power. The present invention also provides an RF power supply capable of delivering a wide range of power over a broad frequency range to a load that is remotely located from the power supply.

Abstract: An electronic control ignition (ECI) box for use with a trench roller or other construction-type equipment to control engine operation and the distribution of electrical power to various components, monitor machine failure faults and engine operating parameters, and archive hours of use. Faults, operating parameters and hours are displayed to an operator using a microprocessor-controlled display. The entire ECI is embedded in a suitable thermally-conductive epoxy encapsulent to form a unitary component that is both vibration-resistant and weatherproof.

Abstract: An RF power supply that is capable of tracking rapid changes in the resonant frequency of a load and capable of quickly responding to varying load conditions so as to deliver the desired amount of power. The present invention also provides an RF power supply capable of delivering a wide range of power over a broad frequency range to a load that is remotely located from the power supply.

Abstract: A tamper evident electronic module comprises an electronic component, a tamper evident sheet, and encapsulant material.

Abstract: A tamper-evident and/or tamper-resistant electronic module comprising an electronic component embedded in an encapsulant material and at least one thin sheet of frangible material contacting and overlying said encapsulant material and overlying said component, said sheet being sufficiently thin that it is likely to crack or break if an attempt is made to drill or cut through it with a laser drill.

Abstract: An RF power supply that is capable of tracking rapid changes in the resonant frequency of a load and capable of quickly responding to varying load conditions so as to deliver the desired amount of power. The present invention also provides an RF power supply capable of delivering a wide range of power over a broad frequency range to a load that is remotely located from the power supply.

Abstract: A radio frequency (RF) power system for providing RF power to a load. The RF power system comprises a tank circuit; a direct current (DC) voltage source that provides a DC voltage within a first predetermined range; an amplifier, coupled to said DC voltage source, to provide an alternating voltage to said tank circuit; a frequency controller, coupled to said amplifier, to control a frequency of said alternating voltage provided by said amplifier; and a power sensor being coupled to said tank circuit for providing a signal to said frequency controller, wherein said frequency controller controls said frequency of said alternating voltage based on said signal provided from said power sensor.

Abstract: An RF power supply that is capable of tracking rapid changes in the resonant frequency of a load and capable of quickly responding to varying load conditions so as to deliver the desired amount of power. The present invention also provides an RF power supply capable of delivering a wide range of power over a broad frequency range to a load that is remotely located from the power supply. According to one embodiment, the RF power supply includes a direct current (DC) voltage source that provides a DC voltage within a predetermined.

Abstract: An RF power supply that is capable of tracking rapid changes in the resonant frequency of a load and capable of quickly responding to varying load conditions so as to deliver the desired amount of power. The present invention also provides an RF power supply capable of delivering a wide range of power over a broad frequency range to a load that is remotely located from the power supply.