162results about How to "Prevent voltage" patented technology

An image guided navigation system for navigating a region of a patient includes an imaging device, a tracking device, a controller, and a display. The imaging device generates images of the region of a patient. The tracking device tracks the location of the instrument in a region of the patient. The controller superimposes an icon representative of the instrument onto the images generated from the imaging device based upon the location of the instrument. The display displays the image with the superimposed instrument. The images and a registration process may be synchronized to a physiological event. The controller may also provide and automatically identify an optimized site to navigate the instrument to.

An image guided navigation system for navigating a region of a patient which is gated using ECG signals to confirm diastole. The navigation system includes an imaging device, a tracking device, a controller, and a display. The imaging device generates images of the region of a patient. The tracking device tracks the location of the instrument in a region of the patient. The controller superimposes an icon representative of the instrument onto the images generated from the imaging device based upon the location of the instrument. The display displays the image with the superimposed instrument. The images and a registration process may be synchronized to a physiological event.

A remote resource can be configured to control connectivity of the power generator modules in a string. For example, a respective power generator module can include a current sense circuit that monitors for presence of communication signal. The power generator module can monitor for a presence of a remotely generated control signal over power line that is used by the respective power generator module to convey power to the external load. If the control signal is present on the power line, as generated by the remote resource, the control circuit in the respective power generator module activates the switch to an ON state such that respective activated power generator module is connected in series with the other activated power generator modules. If no keep-alive control signal is detected within a timeout period, the controller deactivates the respective power generator module.

A multi-battery charging system for reduced fuel consumption and emissions for an automotive vehicle. The system starts the vehicle with a start battery in a fuel savings manner, removing electrical torque from the alternator shaft, and allows a second (run) battery to provide all or some of the current required by the vehicle loads as a fuel savings measure. The system also utilizes an electrically heated catalytic converter (EHC) and a third (EHC or storage) battery to provide a 3 to 15 second preheat and/or a 20 second current, during vehicle start, to the EHC heater coil, e.g., of a small EHC located in series with a standard catalytic converter for emissions reduction to reduce emissions during start. The start battery is recharged after start and switched out of the system fully charged for future vehicle starts. The run battery is recharged when its charge level drops below a predetermined level with an on board battery charging device powered from a 115 volt or 220 volt ac power line source external to the vehicle.

A two-wire dimmer is operable to control the amount of power delivered to a magnetic low-voltage (MLV) load and comprises a bidirectional semiconductor, a timing circuit, a trigger circuit having a variable voltage threshold, and a clamp circuit. When a timing voltage signal of the timing circuit exceeds an initial magnitude of the variable voltage threshold, the trigger circuit is operable to render the semiconductor switch conductive, reduce the timing voltage signal to a predetermined magnitude less than the initial magnitude, and to increase the variable voltage threshold to a second magnitude greater than the first magnitude. The clamp circuit limits the magnitude of the timing voltage signal to a clamp magnitude between the initial magnitude and the second magnitude, thereby preventing the timing voltage signal from exceeding the second magnitude. Accordingly, the MLV dimmer is prevented from conducting asymmetric current when an MLV transformer of the MLV load is unloaded.

A switched-capacitor circuit (10, 32 or 32A) samples a first signal (V_IN⁺) onto a first capacitor (C1 or C_IN1) by switching a top plate thereof via a summing conductor (13) to a first reference voltage (V_SS) and switching a bottom plate thereof to the first signal. A second signal (V_IN⁻) is sampled onto a second capacitor (C3 or C_IN3) by switching a top plate thereof to the second signal and switching a bottom plate thereof to the first reference voltage. After the sampling, the top plate of the second capacitor is coupled to the top plate of the first capacitor. The bottom plate of the second capacitor is coupled to the first reference voltage. The bottom plate of the first capacitor is coupled to a second reference voltage (V_DD or V_REF), to thereby cancel at least a portion of a common mode input voltage component from the first conductor (13), hold the sampled differential charge on the summing conductor and establish a predetermined common mode voltage thereon, and prevent the summing conductor from having a voltage which allows the leakage of charge therefrom. The switched-capacitor circuit may be a SAR, an integrator, or an amplifier.

There is no effective method for fabricating a semiconductor power device containing UMOSFET possessing large channel mobility and whose threshold voltage can be lowered with no loss in blocking voltage. A semiconductor device with large blocking voltage is provided utilizing silicon carbide trench MOSFET possessing both narrow regions where the p body concentration is low, and wide regions where the p body concentration is high.

AC-to-AC power conversion systems and methods are presented, in which a small number of asymmetrical power switching devices are used to convert input AC power to output AC power of constant or variable frequency.

A stable power supply apparatus in accordance with the present invention comprises a secondary battery, a bidirectional chopper circuit and a bidirectional converter, wherein the secondary battery, the chopper circuit and the converter are connected in this order in the direction from the secondary battery side to a system bus line side. The converter is formed of a wide-gap semiconductor device, more particularly, a wide-gap bipolar semiconductor device, and the instantaneous large-power operation capability of the wide-gap bipolar semiconductor device and the instantaneous large-power supplying capability of the secondary battery are utilized. For a short time during which the influence of an instantaneous drop is prevented, the converter is operated as a converter having capability exceeding the instantaneous large-power supplying capability of the secondary battery and having power capacity several times or more the rating of the converter.

A safety drive unit (10) with a safety circuit (12) resets a flap or a valve into a specified safety position for controlling a gas or liquid volumetric flow, in particular in the field of heating, ventilation, and air conditioning (HVAC) fire protection and monitoring systems. The safety drive unit (10) essentially comprises an actuator (14) with a controllable electric motor (28), a capacitive energy storage unit (20), an energy converter (22) with a power module, and a power supply (18). During normal operation, the electric current in the power module of the energy converter (22) is converted to a lower voltage and stored in the capacitive energy storage unit (20) with at least one double-layer capacitor. If the voltage drops below a predetermined value or if there is a power failure, the stored electrical charge is converted back to a higher voltage by the same power module, and the electric motor (28) is activated until the specified safety position is reached.

A battery voltage monitoring apparatus to monitor a voltage of an assembled battery having a plurality of battery cells, the battery voltage monitoring apparatus comprises a first voltage sensor module having a voltage sensor and a first and a second module terminals connected to the voltage sensor, a second voltage sensor module having a voltage sensor different from the voltage sensor included in the first voltage sensor module and a third module terminal connected to the voltage sensor, a first terminal connected to the first and the third module terminals, a second terminal connected to the second module terminal, and a voltage clamp circuit to clamp a voltage between the first and the second terminals disposed between the first and the second terminals.

In the SiC vertical MOSFET having a low-concentration p-type deposition film provided therein with a channel region and a base region resulting from reverse-implantation to n-type through ion implantation, dielectric breakdown of gate oxide film used to occur at the time of off, thereby preventing a further blocking voltage enhancement. This problem has been resolved by interposing of a low-concentration n-type deposition film between a low-concentration p-type deposition film and a high-concentration gate layer and selectively forming of a base region resulting from reverse-implantation to n-type through ion implantation in the low-concentration p-type deposition film so that the thickness of deposition film between the high-concentration gate layer and each of channel region and gate oxide layer is increased.

The invention relates to a power supply circuit (10) and methods for supplying electrical power to at least one load output. The circuit comprises a main power supply unit (12) with a voltage input (14), a main switching element (26) and a reactive element (28). The switching element (26) is controllable to deliver an output voltage or current (I out). Output units (20a, 20b, 20c) with load outputs are connected to a main power supply unit (12). In order to drive loads connected to the load outputs, e.g. LEDs, OLEDs or laser diodes, with exact pulses, each output unit (20a, 20b, 20c) has a load switching element (38) to connect or disconnect the main power supply unit (12) to or from the load output. There are further provided switched capacitor units (34), each with a capacitor (C) and a capacitor switching element (40). The capacitor units may be operated such that the capacitors remain essentially charged at different voltage levels. According to a second aspect of the invention, each output unit (20a, 20b, 20c) has a switched capacitor unit (34) with a capacitor (C) and a capacitor switching element (40) connected to the load output. The load switching element (38) and the capacitor switching elements (40) are controlled synchronously.

A semiconductor device (1) includes an n-type silicon carbide substrate (2) of a high impurity concentration, an n-type silicon carbide layer (3) of a low impurity concentration disposed on the substrate, a first n-type silicon carbide region (4) of a first impurity concentration disposed on the surface of the n-type silicon carbide layer, first p-type silicon carbide regions (5) disposed as adjoined to the opposite sides of the first n-type silicon carbide region, a second n-type silicon carbide region (6) disposed selectively from the surface through the interior of the first p-type silicon carbide region, polycrystalline silicon (7) short-circuiting the first p-type silicon carbide region (5) to the second n-type silicon carbide region (6), a gate electrode (8) and a third n-type silicon carbide region (10), wherein the components thereof are individually constructed in a vertical DMOS structure. Since the polycrystalline silicon short-circuits the first p-type silicon carbide region to the second n-type silicon carbide region, the threshold voltage can be given a fixed value, and the device can be used as an actual MISFET.

A system to detect a ground fault at the output of an inverter section prior to powering up a motor drive system is disclosed. A low voltage power supply is connected to the DC bus prior to connecting the input power source to the rectifier section. If a ground fault exists, the voltage potential on the DC bus causes conduction through one of the freewheeling diodes connected in parallel to the power switching device on the output of the inverter section. A fault detection circuit generates a signal corresponding to the presence of the low Voltage potential when the low voltage is applied to the DC bus. If a ground fault is present at the output of one of the inverter sections, the motor drive system prevents the AC voltage from being applied to the rectifier section.

A light string includes an illumination device, a first wire, a second wire, soldering material, and transparent adhesive. The illumination device includes two soldering portions. The conductors of the first wire and the second wire are partially exposed to form a first soldering section and a second soldering section. Soldering material is used to attach the first soldering section and the second soldering section to the two soldering portions. The transparent adhesive forms a layer over, and covers, the illumination device, the first soldering section and the second soldering section, and extends to partially cover other portions of the first wire and the second wire.

Disclosed are device and method for enabling a programmable semiconductor memory device to provide a block selection transistor of a high voltage withstand type, to prevent the voltage from being decreased at the time of programming and to prevent the readout current from being decreased and to provide a constant sum resistance of the electrically conductive regions without dependency upon the memory cell locations. In a pair of two electrically conductive regions, provided for extending parallel to and in separation from each other on a substrate surface, one longitudinal end of one of the electrically conductive regions is diagonally connected to the other longitudinal end of the other electrically conductive region by a wiring to form a set of sub bit lines. On both ends of the memory cell array, there are provided selection transistors for interconnecting the sub bit lines and main bit lines. A plural number of the sets of the sub bit lines, connecting to the selection transistors on both ends of the memory cell array, are arranged, such that, in a region between paired electrically conductive regions (a, a) forming a set of the sub bit lines, there are provided one each (b, e) of two sets of paired electrically conductive regions forming two sets of sub bit lines connecting to two main bit lines on both sides of a given main bit line and each one (c, d) of two sets of paired electrically conductive regions forming two sets of sub bit lines connecting to the opposite longitudinal end selection transistors. The selection transistors are isolated from one another by a field oxide film.

The electrical storage system includes an electrical storage device, a motor, a system main relay, a first charging line, a charger, a first charging relay, a second charging line, an inlet, a second charging relay and a controller. The controller is configured to control a energizing state and a non-energizing state of the system main relay, the first charging relay and the second charging relay. The controller is configured to cause the first charging relay to the non-energizing state when the second charging relay in the energizing state is subjected to adhesion.

An electrical monitor circuit in which star points of taps on a first and a second side of a three-phase current limiting device are voltage compared. Possible applications are combinations with electrical switches, especially for power supplying and protecting circuits for electrical motors.

There is provided an electrostatic discharge protection device comprising a P conductive type first P well region 101 formed in a P type epitaxial layer 31 being deposited on a surface of a P+ substrate 30 having a prescribed thickness, an N conductive type first N well 101 a periphery thereof being brought into direct contact with and surrounded by a first P well region 101, P conductive type first P diffusion regions 121a and 121b, a P conductive type third P diffusion region 125, and an N conductive type second N diffusion region 223 arranged within a first P well region 101, and a P conductive type second P diffusion region 123 and an N conductive type first N diffusion region 221 arranged within a first N well 201.