Abstract: Zero-crossing detection accuracy is enhanced in a sensorless brushless direct current (BLDC) motor by increasing the PWM drive frequency in anticipation of a zero-crossing event in any one or more commutation periods. Once a zero-crossing event is detected, the PWM frequency can go back to a lower normal operating frequency. Switching losses of the power drive transistors are thereby minimized while maintaining accurate zero-crossing detection for stable operation of the BLDC motor.

Abstract: Provided is an apparatus and method for automatically controlling a wiper of a vehicle, the apparatus including a light emitting means to output one or more optical signals to an inside of a front glass of the vehicle, a light receiving means to receive the optical signals output from the light emitting means, and a control means to control the wiper of the vehicle to be driven based on a light receiving efficiency with respect to received signals received by the light receiving means, when operating in an automatic wiper control mode. Since driving of the wiper is automatically controlled based on the light receiving efficiency of optical signals output to the inside of the front glass, it is possible to secure a visual field of a driver without a need to separately manipulate manually a wiper controller.

Abstract: The invention relates to a method and to an apparatus for the failsafe monitoring of an electromotive drive (10) without additional sensors. The apparatus comprises a drive having a three-phase control of an electric motor, means (20) for detecting the current and voltage profiles of each of the three phases U(, V, W), as they are forwarded to the motor (10) by drive electronics (12), means (26) for determining the load speed (nL) while using the detected current and voltage values, wherein the determination of the load speed (nL) takes place by calculating an observer model with reference to the detected current, to the detected voltage, to the frequency fFU preset by the control and to the characteristic data of the motor (10) and means (28) for generating a failsafe switch signal (30) for the motor (10) when the calculated load speed (nL) does not correspond to a preset desired speed within the framework of preset tolerances.

Abstract: The invention relates to a method and to an apparatus for the failsafe monitoring of an electromotive drive (10) without additional sensors. The apparatus comprises a drive having a three-phase control of an electric motor, means (20) for detecting the current and voltage profiles of each of the three phases (U, V, W), as they are forwarded to the motor (10) by drive electronics (12), means (26) for determining the load speed (nL) while using the detected current and voltage values, wherein the determination of the load speed (nL) takes place by calculating an observer model with reference to the detected current, to the detected voltage, to the frequency fFU preset by the control and to the characteristic data of the motor (10) and means (28) for generating a failsafe switch signal (30) for the motor (10) when the calculated load speed (nL) does not correspond to a preset desired speed within the framework of preset tolerances.

Abstract: A method is provided for supplying electrical power to a load, with a specific quantity of electrical power of different electrical power production types being drawn from an electrical power supply system by the load. The electrical power that is output by the electrical power supply system is identified in terms of its electrical power production type and the quantity of electrical power drawn by the load is detected separately in accordance with the electrical power production types. This provides the option of illustrating to the electrical power customer the origin of the electrical power which is drawn.

Abstract: A power supply device and a driving method thereof which produces and supplies electric energy from ecology-friendly “green” energy sources. The power supply device collects green energy and supplies power to a load, and includes: a main power source unit that includes a collection unit for collecting green energy and generate electric energy therefrom, a converter which converts the electric energy from the collection unit into a predetermined electric energy level and a battery unit that stores the electric energy converted by the converter and supplies power to the load; and an auxiliary power source unit that supports the main power source unit and supplies power to the load. Maximum energy may be collected from green energy sources and generate maximum amounts of electric energy.

Abstract: A system includes multiple photovoltaic panels having a combined output profile that defines energy or power generated by the photovoltaic panels over time. Each photovoltaic panel is configured to generate a peak amount of energy or power at a different time. The system also includes a storage device having a charging profile and configured to be charged by the photovoltaic panels. The charging profile defines a maximum amount of energy or power sinkable by the storage device at a given time. The output profile and the charging profile are substantially matched such that a maximum level of the output profile is approximately equal to the maximum amount of energy or power sinkable by the storage device. The maximum level of the output profile could be substantially constant over time between first and second peak amounts of energy or power generated by different photovoltaic panels.

Abstract: A solar powered apparatus that includes a battery, at least one photovoltaic cell (which may be part of a solar module comprising multiple photovoltaic cells), and a DC-capable AC appliance, such as a compact fluorescent light. The solar powered apparatus may also include a first DC to DC converter that receives a first electrical signal from the at least one photovoltaic cell and provides a charging signal to the battery, and a second DC to DC converter that receives a second electrical signal from the battery and provides a DC power signal to the DC-capable AC appliance.

Abstract: A hybrid energy storage system for supplying power to an application with a fluctuating load profile, such as, for example, electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, wind energy harvesting equipment and solar energy harvesting equipment. The hybrid energy storage system includes an ultra-capacitor electrically connected to a DC bus and a power source electrically connected to the DC bus via a controlled switch. The hybrid energy storage system further including a DC/DC converter connected between the power source and the ultra-capacitor, the DC/DC converter boosting a voltage of the power source to charge the ultra-capacitor. The DC/DC converter is preferably controlled to maintain a voltage of the ultra-capacitor at a higher value than the voltage of the power source.

Abstract: A power charging device with charge saturation disconnector through electromagnetic force release is formed by charging power supply, charging control device, magnetic actuator conductive device, power excitation windings, rechargeable discharge device, and various detection devices optioned as need for detection the charge situation of the rechargeable discharge device.

Abstract: A battery charger is provided. The charger includes an AC input for connection to a source of AC power and a plurality of DC outputs each being connectable to a battery bank. A user interface is provided for inputting battery information including battery voltage and battery type for each DC output. A main controller is in communication with the user interface and receives the battery information from the user interface. The main controller uses the battery information to provide independent charging instructions for each DC output. At least one power module is in communication with the main controller and receives the charging instructions from the main controller. The power module is configured to convert the AC power from the AC input to DC power and is selectively connectable with each of the plurality DC outputs.

Abstract: A charging station for charging an electrical device, such as a cellular phone, has a housing, an electrical power plug mounted on a rear portion of the housing which is receivable by a wall mounted electrical power receptacle, an electrical power outlet mounted on a lateral side of the housing, and a universal serial bus (USB) connector mounted on a front face of the housing. A cradle is formed in an upper portion of the housing for supporting an electrical device being charged by the charging station.

Abstract: Inductively coupled battery charging systems and methods are provided. Transmit circuitry can include a transmit coil operatively part of a transmit resonant circuit that exhibits resonance at a transmit resonant frequency and an unloaded Q value of at least about 20. Transmit coil can generate a magnetic field at about the transmit resonant frequency. Rechargeable battery assembly can include a receive coil configured to receive inductively coupled current, and circuitry configured to rectify the current and communicate charging power to a storage cell. Receive coil can be part of a receive resonant circuit that exhibits resonance at about the transmit resonant frequency and an unloaded Q value of at least about 10. Transmit circuitry can include multiple transmit coils and can selectively discontinue production of alternating current in the coils generating fields that are not most strongly coupled to the receive coil.

Abstract: Inductively coupled battery charging systems and methods are provided. Transmit circuitry can include a transmit coil operatively part of a transmit resonant circuit exhibiting resonance at a transmit resonant frequency and an unloaded Q value of at least about 20. Transmit coil can generate a magnetic field at about the transmit resonant frequency. Rechargeable battery assembly can include a receive coil configured to receive inductively coupled current, and circuitry configured to rectify the current and communicate charging power to a storage cell. Receive coil can be part of a receive resonant circuit that exhibits resonance at about the transmit resonant frequency. Transmit circuitry can be configured to regulate alternating current produced in the transmit coil based on current flowing in the transmit resonant circuit and/or maintain the magnetic field at about the transmit resonant frequency by maintaining about a ninety degree phase shift between a square wave input and output.

Abstract: Inductively coupled battery charging systems and methods are provided. Transmit circuitry can include a transmit coil operatively part of a transmit resonant circuit that exhibits resonance at a transmit resonant frequency and an unloaded Q value of at least about 20. Transmit coil can generate a magnetic field at about the transmit resonant frequency. Rechargeable battery assembly can include a receive coil configured to receive inductively coupled current, and circuitry configured to rectify the current and communicate charging power to a storage cell. Receive coil can be part of a receive resonant circuit that exhibits resonance at about the transmit resonant frequency. Transmit circuitry can be configured to detect the rechargeable battery assembly by monitoring a load on the transmit coil.

Abstract: The present invention provides a portable electronic device including an antenna having a major planar cross-section, and a power transfer coil having windings parallel to a coil plane, the coil plane extending to the perimeter of the power transfer coil. The antenna and the power transfer coil are arranged such that the major planar cross-section is substantially perpendicular to the coil plane if a line directed perpendicularly from the coil plane intersects the major planar cross-section. An associated method of assembling a portable electronic device is also provided.

Abstract: A wireless transmission system having a transmitter and receiver is described. In one embodiment, the transmitter includes an electronically-controlled switch controlled by a first pulse width modulation control circuit, the switch configured to pull current through a first inductor when the switch is closed, the first pulse width modulation control circuit outputting a PWM output signal to control the switch. A first feedback signal obtained from a control input of the switch. A second feedback signal obtained from a terminal of the inductor, wherein a control feedback signal is computed, at least in part, as a difference between the first feedback signal and the second feedback signal is provided to the first pulse width modulation control circuit. In one embodiment, the receiver includes a second pulse with modulation controller, the second pulse width modulation controller controlling the receiver switch to deliver a desired power from the receiving coil to a load.

Abstract: A charging base for charging a mobile device includes an induction coil and a battery pack. The pack includes a battery charged by the induction coil. The base includes a base case, a mount portion, a power supply coil, and a power supply. The mount portion is recessed on the surface of the case, and can detachably hold the device. The power supply coil is arranged in proximity to and inside the recessed bottom surface of the mount portion to be electromagnetically coupled to the induction coil, and connected to the power supply coil. A cut-out portion is formed in a surface of the mount portion by partially cutting out the case to communicate with the outside. This surface intersects a mount surface of the device.

Abstract: An electric machine and a power supply system, in which a battery pack can be easily and safely replaced with another, and electric power can be transferred with high transfer efficiency. An electric machine of the present invention includes a driving electric motor, a battery pack for supplying electric power to the driving electric motor, and an energy transfer section for transferring electric energy output from the battery pack to the driving electric motor. The battery pack includes a first antenna for receiving electric power from a power supply source located outside the electric machine by coupling with a first resonant magnetic field generated by the power supply source, at least one secondary battery charged by the electric power received by the first antenna, an oscillator for producing radio-frequency power by DC power discharged from the secondary battery, and a second antenna for generating a second resonant magnetic field by the radio-frequency power.

Abstract: A power and communication system for a mobile cart is provided. The system includes a wall unit, which includes a processor and a power circuit. The power circuit receives external power and provides switched AC power to the cart unit when the wall unit is engaged with the cart unit and the processor enables the power circuit. The system also includes a cart unit. The cart unit includes a memory device storing a signature. The memory device is coupled to the processor when the wall unit is engaged with the cart unit. The processor detects continuity when the wall unit is engaged with the cart unit, and in response, the processor reads the signature. The processor enables the power circuit if the signature is a valid signature, and disables the power circuit if the signature is invalid. The switched AC power recharges a rechargeable power source of the mobile cart.

Abstract: A wall charger includes a body that has at least one prong configured to be connected to an alternating current (AC) power source, a Universal Serial Bus (USB) connection port, the USB connection port being electrically connected to the at least one prong, and a docking port, and a removable charger, wherein the docking port is configured to slidably receive the movable charger, the docking port being electrically connected to the at least one prong. In another aspect of the disclosure, the removable charger comprises a second USB connection port electrically connected to the at least one prong. In yet another aspect of the disclosure, a method for charging at least one portable electronic device with the wall charger includes connecting the at least one prong to an AC power source and connecting a portable electronic device (PED) to the USB connection port.

Abstract: A portable electric device charging connector arrangement comprising a socket, a power supply connected to the socket, the socket including a female USB connector; an adapter comprising a housing and a male USB plug extending from the housing; a mounting arranged to support the housing; the mounting including a socket engaging portion arranged so that the socket engaging portion engages the socket when the USB plug is engaged in the USB socket; the housing further comprising a device connector extending upwardly in use so that a portable electric device may be charged when engaged to the device connector.

Abstract: A charging control method for a battery pack including a plurality of battery cells in which a full charge voltage value is initially set as a first voltage value. The charging control method includes: charging the plurality of battery cells to the first voltage value in an initial charge mode; and resetting the full charge voltage value to a second voltage value less than the first voltage value in a subsequent charge mode.

Abstract: Batteries, battery systems, battery submodules, battery operational methods, battery system operational methods, battery charging methods, and battery system charging methods are described. According to one aspect, a battery includes a first battery terminal, a second battery terminal, and a plurality of submodules individually comprising a first submodule terminal, a second submodule terminal, a plurality of rechargeable cells electrically coupled between the first and second submodule terminals, and switching circuitry configured to electrically couple one of the first and second battery terminals with one of the first and second submodule terminals of one of the submodules during an engaged mode of operation of the one of the submodules and to electrically isolate the one of the first and second battery terminals from the one of the first and second submodule terminals of the one of the submodules during a disengaged mode of operation of the one of the submodules.

Abstract: A secondary battery and charging system are provided within an electric car or other electric drive vehicle. The secondary battery may, e.g., be owned by the electric utility. The battery is removable and can be charged and discharged independently of the primary car battery system. The utility can use the secondary battery to implement vehicle-to-grid functionality.

Abstract: A secondary battery and charging system are provided within an electric car or other electric drive vehicle. The secondary battery may, e.g., be owned by the electric utility. The battery is removeable and can be charged and discharged independently of the primary car battery system. The utility can use the secondary battery to implement vehicle-to-grid functionality.

Abstract: A smart cart for automatically managing a plurality of information handling systems. The system provides a plurality of functions. For example, in certain embodiments, the system provides one or more of security authentication for distributing the notebooks, automatic asset tracking functionality; identification of notebook charge status; provides identification of asset information (e.g., an asset tag number, a serial number or a computer name); network access to push patch updates at night when units are not in use; and charging control to optimize system availability and prevent AC input circuit overload.

Abstract: A circuit for controlling a current flowing through a battery includes a driver and a filter coupled to the driver. The driver can generate a pulse signal in a first operating mode and generate a first signal in a second operating mode to control the current through the battery. The filter can filter the pulse signal to provide a filtered DC signal to adjust an on-resistance of a switch in series with the battery based on a duty cycle of the pulse signal in the first operating mode. The filter can receive the first signal and provide a second signal to drive the switch in a linear region in the second operating mode.

Abstract: An electricity storage system includes a plurality of storage modules connected in series, each storage module including a single storage cell or a plurality of storage cells connected in series, an isolation transformer and a rectifying circuit that are associated with each of the storage modules, the isolation transformer having a primary winding and a secondary winding, and a voltage balancing circuit that generates an alternating current by switching a direct-current power source, the primary windings of the isolation transformers being all connected in parallel and connected to an output end of the voltage balancing circuit by a common wiring, the secondary windings of the isolation transformers being connected to the corresponding storage modules via the respective rectifying circuits, the alternating current being supplied to the primary winding of each of the isolation transformers.

Abstract: A power supply device and system have an electrically polarized element in which a remnant electrical polarization is formed and retained. Electrodes are formed on the electrically polarized elements and the remnant electrical polarization generates an electrical potential on the electrodes. Electrical circuits are coupled to the electrically polarized element to control the external electric charges attracted and distributed on the electrodes, for establishing the electrical potential on the electrodes. The electrodes can output electric currents by controlling the external electric charges distribution. The electrically polarized element may be made of ferroelectric material, including a ferroelectric bulk ceramic, ferroelectric multilayer ceramic, ferroelectric single crystal, ferroelectric thin film, ferroelectric thick film and ferroelectric polymer, and all the other materials with electric polarization retained therein.

Abstract: The present invention relates to power distribution systems (e.g. a marine power distribution and propulsion system) that include first and second ac distribution busbars. The first ac distribution busbar will typically be a medium voltage busbar for the propulsion drive systems and the second ac distribution busbar will typically be a low voltage for ships services. A 12-pulse rectifier has its ac terminals electrically connected to the first ac distribution busbar. A multiple output generator has first and second galvanically-isolated stator windings. The first stator winding provides a six-phase ac output and is connected to the first ac distribution busbar. The second stator winding provides a three-phase ac output and is connected to the second ac distribution busbar. The six-phase ac output is phase shifted relative to the three-phase ac output to reduce the problematic coupling of harmonic distortion between the first and second ac distribution busbars.

Abstract: A method for monitoring an electrodynamic machine a stator and a rotor arrangement mounted along a rotatable shaft. The rotor arrangement is disposed within the stator and forms an air gap between the rotor arrangement and the stator. At least one sensor is disposed in the air gap and/or within the stator. Measurement signals are detected that are dependent on a magnetic field produced by the electrodynamic machine. The measurement signals are used as a basis for detecting oscillations of the shaft.

Abstract: Disclosed herein are various embodiments of systems and methods for controlling a voltage profile delivered to a load in an electric power system. According to various embodiments, an electric power system may include an electric power line, a variable tap transformer, and a capacitor bank. The variable tap transformer may include a plurality of tap positions. A tap change controller may be coupled with the variable tap transformer and may control the tap positions of the variable tap transformer. A capacitor bank controller may be coupled with the capacitor bank and may selectively couple the capacitor bank to the electric power line. The tap change controller and the capacitor bank controller may share system information related to the voltage profile along the electric power line and to change the voltage profile along the line using the variable tap transformer and the capacitor bank depending on the system information.

Abstract: A multi-phase buck converter has a digital compensator to select a set of compensation coefficients depending on the operating phase number of the multi-phase buck converter, or including different compensators for each operation phase number to improve the loop gain bandwidth, transient response and stability of the multi-phase buck converter. The multi-phase buck converter operates with more phase circuits for higher loading and operates with fewer phase circuits for lower loading. The compensation varies with the number of the operated phase circuits so to be adaptive to the operation condition with an optimized control-to-output voltage transfer function.

Abstract: The invention relates to a power converter comprising: a bus capacitor (Cb) connected between the positive line (10) and the negative line (11) of a power supply bus, a number of switching legs connected between the positive line (10) and the negative line (11) of the power supply bus, each switching leg comprising two series transistors of field-effect type, a first switch (I1) connected to the positive line (10) of the power supply bus, upstream of the bus capacitor (Cbus), a second switch (I2) connected to the positive line (10) of the power supply bus, downstream of the bus capacitor (Cbus), control means (3) for the first switch (I1) and for the second switch (I2).

Abstract: A booster circuit according to the present invention includes a booster that connects a boosting condenser that is charged and a direct-current power source in series through a switch for a boosting operation in order to generate a boosted voltage and charges a smoothing condenser with the boosted voltage through a switch for an outputting operation. The switch for the boosting operation is composed of a plurality of switches connected in parallel and at least one of the plurality of switches can be controlled independently.

Abstract: A control circuit and method for a power converter controlling adaptive voltage position comprises an adder acquiring an output voltage difference between the output voltage and the reference output voltage, a digital compensator with an Z-domain transfer function to reference to the output voltage difference to generate a pulse width control signal, regulating the least significant bits of a denominator coefficient in the Z-domain transfer function such that a load line function of the power converter is performed via control of the pulse width control signal, and a pulse modulation circuit being controlled by the pulse width control signal to generate the pulse width modulation signal to control ON/OFF of power switch of the power converter. Thus, functions of controlling the negative or positive load lines and function of variable load line required by the operation of multiphase converter can be performed easily without complicated operations.

Abstract: Switching mode power supplies (SMPS) that can operate in a control mode for a normal load condition and operate with a burst-mode controller for a light load condition are disclosed herein. In one embodiment, a method for controlling the switching mode power supply includes when the load is in a light load condition, the switching mode power supply is controlled by a burst-mode controller.

Abstract: Disclosed is a multi-phase pulse width, modulated voltage regulator and method in which transient voltage excursions or deviations that exceed the load line voltage by more than a pre-determined amount are detected by an ATR circuit and a correction signal is applied. The correction signal is in the form of asynchronous pulses and the number of such pulses is a function of the magnitude of the voltage excursion as determined by the number of thresholds that are exceeded. Also disclosed is an adaptive voltage positioning (AVP) circuit and method for early detection of a transient event by sensing voltage changes at the load and adjusting the target voltage with pre-determined current values prior to the time that ATR event changes in the current at the load are detected.

Abstract: A power supply controller having final test and trim circuitry. In one embodiment, a power supply controller for switched mode power supply includes a selector circuit, a trim circuit, a shutdown circuit and a disable circuit. The trim circuit includes a programmable circuit connection that can be selected by the selector circuit by toggling a voltage on an external terminal such as for example a power supply terminal, a control terminal or a function terminal of the power supply controller. The programmable circuit connection in the trim circuit can be programmed by applying a programming voltage to the external terminal. The shutdown circuit shuts down the power supply controller if the temperature rises above an over temperature threshold voltage. The shutdown circuit includes adjustment circuitry that can be used to test the shutdown circuit. The adjustment circuitry can adjust and reduce the over temperature threshold of the power supply controller.

Abstract: In accordance with the invention there is also provided a voltage combiner (200) comprising: a transformer (104) having a first (108) and second (110) winding each having a first and second tap; and an inductor (120) connected between the first and second taps of the second winding, wherein: the first tap of the first winding is adapted for connection to a first voltage (114), the first tap of the second winding is adapted for connection to a second voltage (102), and the second tap of the second winding is adapted to provide an output being the first and second voltages combined, and further wherein: the inductor (120) is adapted to provide a bypass path for the current associated with the second voltage.

Abstract: Provided herein are circuits and methods to generate a voltage proportional to absolute temperature (VPTAT) and/or a bandgap voltage output (VGO) with low 1/f noise. A first base-emitter voltage branch is used to produce a first base-emitter voltage (VBE1). A second base-emitter voltage branch is used to produce a second base-emitter voltage (VBE2). The circuit also includes a first current preconditioning branch and/or a second current preconditioning branch. The VPTAT is produced based on VBE1 and VBE2. A CTAT branch can be used to generate a voltage complimentary to absolute temperature (VCTAT), which can be added to VPTAT to produce VGO. Which transistors are in the first base-emitter voltage branch, the second base-emitter voltage branch, the first current preconditioning branch, the second current pre-conditioning branch, and the CTAT branch changes over time.

Abstract: A programmable current mirror a reference transistor, first and second mirror transistors, and a first current bypass. The reference transistor has a source and a gate coupled to a reference current node. The first and second mirror transistors are coupled together in series at a first node. Each of the first and second mirror transistors having gates coupled to each other and to the gate of the reference transistor. The first current bypass including a switch disposed in parallel with the second mirror transistor. The first current bypass is coupled to a source and a drain of the second mirror transistor and to the first node.

Abstract: A low powered activation electronic device includes a power source, an electronic circuit, having two spaced apart electrodes, electrically connected to the power source to form an opened circuit, and two fabric contacts made of textile material provided at the two electrodes of the electronic circuit, wherein the electronic circuit is formed a closed circuit to activate the electronic device in responsive to a physical touch by a human operator at the two fabric contacts.

Abstract: A method of improving voltage detection accuracy and precision by employing a switchable resistor epi bias design, which consists of switches to control connection of resistor epi bias. By constantly maintaining the resistor epi bias to its own resistor terminal bias via switches, higher accuracy detection than conventional resistor bias method can be achieved.

Abstract: Power saving for hot plug detect (HPD) is disclosed. In a particular embodiment, a method includes detecting, at a source device that is connectable to a sink device, a connection of the source device to the sink device via a connector. The source device includes a DC voltage source and the connection is detected without consuming power from the DC voltage source.

Abstract: An apparatus and method to recognize tones from human singing or similar characteristics is described. The method used to recognize the tone tries to mimic how human brain interprets tones and reduces errors by use multiple combinations of trial and error to get the closest frequency of the tone.

Abstract: A signal generation circuit includes: a first signal source that generates a first signal; and a variable rate frequency divider section that generates a variable rate frequency-divided signal in which a first frequency-divided signal obtained by frequency-dividing the first signal by a first frequency dividing ratio and a second frequency-divided signal obtained by frequency-dividing the first signal by a second frequency dividing ratio temporally alternately appear in a specified mixing ratio.

Abstract: The object of the invention is to provide a method and a system for fixating a Faraday optical current sensor (12a, 12b, 12c) in a suitable measurement position for measuring the current in a 3-phase cable (14). The 3-phase cable (14) comprises 3 individual section-shaped phase conductors (16a, 16b, 16c) insulated in relation to one another and encapsulated inside an insulator (18). The method comprises the provision of a Faraday optical current sensor arrangement comprising 3 Faraday optical current sensors (12a, 12b, 12c), each Faraday optical current sensor being fixated in a specific position outside the section-shaped phase conductors (16a, 16b, 16c), and the provision of a processing unit for calculating a current value from a magnetic field value.

Abstract: A circuit, a system and/or a method detect a passive electrical connection and/or an active electrical connection between an electrical device and a power supply. An integrity of the electrical connection between the electrical device and the power supply is monitored to determine if the electrical device may have access to power and/or to determine if the electrical device may be secure while on display. A high frequency AC signal is modulated onto a positive power rail between the electrical device and the power supply. Capacitance circuitry of the electrical device may remove the high frequency signal from the positive power rail. An absence of the high frequency signal on the positive power rail indicates that the electrical connection exists between the electrical device and the power supply. A presence of the high frequency signal on the positive power rail indicates that the electrical connection does not exist between the electrical device and the power supply.