摘要:
A protection circuit for a parallel power system having at least two parallel coupled voltage regulators is disclosed. The protection circuit includes at least two isolation control circuits, each control circuit being coupled to a respective voltage regulator. Each isolation control circuit includes a current sense circuit for sensing current polarity at an output of the respective voltage regulator, and a controller for automatically isolating the respective voltage regulator when an over-voltage condition exists at an output of the parallel power system and a positive current polarity is sensed at the output of the respective voltage regulator. The at least two isolation control circuits isolate only a voltage regulator having positive current outflow during the over-voltage condition. In one embodiment, each isolation control circuit further includes an over-voltage detection circuit for detecting when the over-voltage condition exists at the output of the parallel power system.
摘要:
A system and method for providing an interface between a master device referenced at a first voltage and a slave device referenced at a second voltage. The system includes a bidirectional communications link between the master device and the slave device and a bidirectional transceiver device in the communications link for decomposing bidirectional signals on the communications link into transmissions from the slave device to the master device onto a first bus, and transmissions from the master device to the slave device onto a second bus. A first isolation device is included in the bidirectional link and connected to the first bus for transmitting signals over the bidirectional link from the master device referenced at the first voltage to the slave device referenced at the second voltage. A second isolation device in also included in the bidirectional link and connected to the second bus for transmitting signals over the bidirectional link from the slave device referenced at the second voltage to the master device referenced at the first voltage.
摘要:
A communication system, method and program product are provided for establishing an extended bidirectional communication bus between a first device and a second device. The communication system includes decomposition logic for decomposing a single line, bidirectional data communication bus into a unidirectional transmit data communication bus and a unidirectional receive data communication bus. A differential communication subsystem is connected to the two unidirectional buses for extending the length thereof, and recomposition circuitry is connected to the differential communication subsystem for recombining the extended unidirectional transmit data communication bus and the extended unidirectional receive data communication bus to reestablish the single line, bidirectional data communication bus. The decomposition logic, differential communication subsystem and recomposition circuitry are implemented transparent to the first device and the second device and without use of a data direction control line.
摘要:
A system and a method for starting a brushless DC motor are provided. The method includes applying commutation pulses to at least two phase coils to induce a rotor to rotate to a starting position and then de-energizing the at least two phase coils. The method further includes applying commutation pulses to at least two phase coils to induce the rotor to rotate from the starting position in a predetermined direction. The method further includes de-energizing all phase coils for a first time interval after the rotor is rotating and sampling a back EMF signal in at least one of the phase coils to determine a first value indicative of an electrical period of the back EMF signal or a portion of an electrical period of the back EMF signal. Finally, the method includes applying commutation pulses to at least two phase coils for a second time interval, the second time interval being based on the first value.
摘要:
A communication system for establishing bidirectional, asynchronous communication between a first device and a second device. The system includes first asynchronous encoder logic and second asynchronous encoder logic for controlling the state of the communication system such that bidirectional communication is enabled without a direction control line.
摘要:
A method and related apparatus for servicing an electrical/electronic device during power shut offs is provided. The apparatus comprises a service logic having a memory and control component for storing device information during normal device operation and one or more indicators driven by the memory and control component after power shut off to provide service signals. The service logic also includes an auxiliary energy source selectively engageable to provide auxiliary power to the memory and control component during power shut off and to enable providing of service signals through the indicator(s).
摘要:
One or more multiport systems are used to facilitate servicing of asynchronous communications events. A multiport system, such as an open collector multiport system, receives from one of a plurality of source components an asynchronous communications event directed to a target component coupled to the plurality of source components. The multiport system is controlled to provide, at any given time, a communications path between a plurality of ports of the multiport system to service the asynchronous communications event. One or more multiport systems are used to forward the event from the source to the target.
摘要:
A protection circuit for a parallel power system having at least two parallel coupled voltage regulators is disclosed. The protection circuit includes at least two isolation control circuits, each control circuit being coupled to a respective voltage regulator. Each isolation control circuit includes a current sense circuit for sensing current polarity at an output of the respective voltage regulator, and a controller for automatically isolating the respective voltage regulator when an over-voltage condition exists at an output of the parallel power system and a positive current polarity is sensed at the output of the respective voltage regulator. The at least two isolation control circuits isolate only a voltage regulator having positive current outflow during the over-voltage condition. In one embodiment, each isolation control circuit further includes an over-voltage detection circuit for detecting when the over-voltage condition exists at the output of the parallel power system.
摘要:
An arbitration mechanism is provided for arbitrating between redundant controllers having outputs electrically connected together and provided as input to at least one device under control. The arbitration mechanism includes logic for automatically determining which controller of the redundant controllers is active controller, and a hardware output interlock for the redundant controllers to ensure that output controlled by only the active controller is enabled as input to the at least one device. The arbitration mechanism also includes logic for monitoring the active controller for failure, and upon detection of failure, for automatically switching active control to another controller of the redundant controllers transparent to the at least one device.
摘要:
In a bi-directional, self-synchronous bus for communication between semiconductor devices, a logic delay is provided as a flag to a state machine control for indicating that the bus is making a transition from a low to a high state. The logic delay causes the bus to adaptively idle until the bus settles, making it amenable for a wide variety of bus sizes and topologies. In this way, oscillation of the bus is avoided without slowing the speed of the state machine clock.