Abstract:
A method of balancing current supplied by a plurality of regulators coupled to a load includes: measuring an average load current supplied by each regulator; determining an overall average current to be shared by the plurality of regulators; comparing each average load current with the overall average current to be shared by the plurality of regulators; and adjusting an output current of one or more of the plurality of regulators so that the plurality of regulators supply the same current to the load.
Abstract:
Embodiments of a valve actuator are provided for adjusting the position of a main valve element in relation to the pressure of a fluid supplied by a supply duct. The valve actuator includes a housing, a control pressure valve disposed in the housing, and a piston slidably disposed in the housing and mechanically coupled to the main valve element. The housing has a control pressure chamber therein, which is configured to be fluidly coupled to the supply duct. The control pressure valve is configured to substantially impede fluid flow into the control pressure chamber until the fluid pressure within the supply duct surpasses a minimum actuation pressure. The piston normally resides in a first position and is configured to move toward a second position as the pressure within the control pressure chamber increases.
Abstract:
A power semiconductor module includes a power semiconductor die, a metal substrate, a patterned metallization layer, a plurality of padless electrical connections, a plurality of vias and an inductor. The power semiconductor die has a top surface, an opposing bottom surface and a plurality of sides extending between the top and bottom surfaces. The metal substrate is attached to the bottom surface of the die. The patterned metallization layer is disposed above the top surface of the die. The plurality of padless electrical connections are at the top surface of the die and connect the patterned metallization layer to the die. The plurality of vias are disposed adjacent one or more of the sides of the die and electrically connected to the patterned metallization layer at a first end of the plurality of vias and to the metal substrate at a second end of the plurality of vias.
Abstract:
Methods and apparatus for current sensing in mutually coupled inductors according to various aspects of the present invention may operate in conjunction with a control system adapted to control current through the inductors and multiple current sensors connected to the control system. Each current sensor may comprise a series combination comprising a capacitor and a resistor. The series combination may be connected in parallel with one of the inductors, and may be adapted to generate branch inductor current signals according to a sensed current in the connected inductor. In addition, a coupling capacitor may be coupled between at least two of the current sensors to compensate a time constant of the current sensor for mutual coupling inductance between the inductors.
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:
Methods and apparatus for regulating power supply according to various aspects of the present invention operate in conjunction with an electronic system configured to interface with a primary voltage regulator. The electronic system comprises a load configured to receive supply current from the primary voltage regulator and a secondary voltage regulator. The secondary voltage regulator includes at least one current source coupled to the load and is configured to provide current to the load. The secondary voltage regulator further comprises a control circuit coupled to the current source and the load, which determines a current demand for the load exceeding the supply current received from the primary voltage regulator, and adjusts the current provided to the load by the current source according to the current demand.
Abstract:
Reduction of administrative overhead in maintaining network information, rapid convergence on an optimal routing path through the data network, and utilization of only required network resources are realized by a novel method for establishing a call path between network users. The method is based upon deployment of a network information server that stores network topology information and that is addressable by each end user. In this method, the network information server receives a request to establish a call path. The request identifies at least the calling party. In response to the request, the network information server determines a network traversal between the calling party and a root network wherein the network traversal includes call path information about the sub-networks between the calling party and the root network. The request for establishing a call path can also identify the called party. Based on the calling and called party identification, the network information server also determines a second network traversal between the called party and the root network. The second network traversal is sent to either the calling party or the called party or to both the calling and called parties. The server can determine an intersection of the traversals and send the intersection information to the parties. The intersection information is known as a merge point and represents an optimal call path between the parties.
Abstract:
A sense circuit and a system including a sense circuit are disclosed. The sense circuit is configured to measure and change in current with respect to time and/or a change in voltage across a portion of a substrate.
Abstract:
The chip-to-board (or chip-to-MCM) connection assembly and method therefor features a semiconductor chip (31) having a front surface (31f) on which external terminal pads are provided; a board or MCM (32) having a surface (e.g., a recessed surface) at a first side thereof to which the rear surface (31r) of the chip is affixed; and a connection carrier (33), disposed as an overlay, which electrically links the chip and the board or MCM. In this assembly scheme, the connection carrier (e.g., a bump carrier) which is affixed to both the chip and the board or MCM, contains all required signal line tracings (57) to provide the electrical interconnection between the semiconductor chip and the board or MCM. The bump carrier replaces all bond wires (24) and the like and can include support/control circuitry, passive and/or active, associated with, for example, high-speed/high-power IC chips (51). The connection carrier (33) is provided with the electrical contacts (34) such as bump electrodes each interconnecting a contact location (37) at the surface side of the connection carrier facing the semiconductor chip and the oppositely disposed (i) external pad on the chip or (ii) external pad or landing (35) at a side of the board (32) facing the connection carrier (33). Heat generated during operation is released through the rear side of the semiconductor chip (31r), which is affixed to the board or MCM (32).
Abstract:
A scroll compressor may be provided with a check valve interposed between a balance chamber and a discharge chamber. The check valve may allow balance chamber pressure to remain low during start-up of the compressor. Low balance chamber pressure may allow an orbiting scroll to remain unclamped to a fixed scroll thereby reducing torque required to initiate rotation of the orbiting scroll. After steady-state operational speed is reached the check valve may close and the scrolls may be clamped together to produce a desired steady-state operating condition for the compressor.