Abstract: Systems and methods are disclosed for providing over-voltage protection for power converters. An over-voltage protection loop includes an error amplifier that maintains an external reference voltage within a highly precise range that can be used to provide a highly precise output voltage from the over-voltage protection loop. The over-voltage protection loop may also include feedback impedance that delays the output of the over-voltage protection loop. The delay may prevent the over-voltage protection loop from being engaged due to voltage transients output from a main servo loop circuit that provides a nominal output voltage under normal operation, thus allowing the threshold voltage and output voltage of the over-voltage protection loop to be set close to the nominal output voltage of the main servo loop circuit.

Abstract: A traffic lamp and a method of controlling the traffic lamp based on a power signal are provided. The traffic lamp can include a controller and a light emitting element When a plurality of light emitting elements is included in the traffic lamp, each light emitting element is coupled with a separate controller. Each controller can be configured to include a predetermined light emitting timing sequence for the corresponding light emitting element. When the power signal is supplied to the traffic lamp, each controller determines a power signal characteristic such as a frequency or a period of the power signal and controls a light output of the light emitting element: based on the power signal characteristic and the light emitting timing sequence. A plurality of light emitting elements can be synchronized using the power signal applied to the traffic lamp.

Abstract: Embodiments of an apparatus comprising a light guide including a proximal end, a distal end, a display positioned near the proximal end, an ocular measurement camera positioned at or near the proximal end to image ocular measurement radiation, a proximal optical element positioned in the light guide near the proximal end and a distal optical element positioned in the light guide near the distal end. The proximal optical element is optically coupled to the display, the ocular measurement camera and the distal optical element and the distal optical element is optically coupled to the proximal optical element, the ambient input region and an input/output optical element. Other embodiments are disclosed and claimed.

Abstract: Systems and methods for monitoring operating parameters of traffic lamps. A traffic lamp includes one or more memory modules and a controller. The controller receives data pertaining to one or more operating parameters of the traffic lamp and logs the one or more operating parameters to the one or more memory modules using the received data. The controller may log the one or more operating parameters to the one or more memory modules upon detection of a fault in the one or more operating parameters.

Abstract: Systems and methods that provide control circuits having multiple sub-control inputs that control operation of a power electronics device (e.g., a power converter). Each of the multiple sub-control inputs are output from a separate sub-control circuit that includes a feedback circuit having an input tied to a common control node. The common control node is coupled to an input of a controller (e.g., a PWM controller). Outputs of each of the sub-control circuits are coupled to the common control node by a respective switch (e.g., diode, transistor, etc.) so that each of the sub-control circuits may be selectively coupled to the common control node to provide a control signal to a controller. Since components of each of the feedback compensations circuits are biased at a regulation voltage instead of a higher power supply voltage, the control circuit may switch between control modes with minimal delay.

Abstract: Provided is a traffic communication network that includes a signaling system including a plurality of light signaling devices, and a controller configured to wirelessly control the plurality of light signaling devices; and a remote control system in wireless communication with the controller and configured to control the controller

Abstract: Provided is a traffic communication network that includes a signaling system having a plurality of light signaling devices, a controller disposed at at least one traffic intersection, and configured to wirelessly control the plurality of light signaling devices. A remote control system is also provided to wirelessly transmit commands to the controller and directly to the plurality of light signaling devices.

Abstract: Provided is a traffic communication network that includes a signaling system having a plurality of light signaling devices, a controller disposed at at least one traffic intersection, and configured to wirelessly control the plurality of light signaling devices, and a video camera configured to obtain status information of the plurality of light signaling devices. A remote control system is also provided to wirelessly transmit commands to the controller and the video camera, for controlling the plurality of light signaling devices.

Abstract: The present subject matter is directed to an adaptive load circuit for use with traffic light control systems so as to permit operation using low current consumption lamps where the traffic light control systems were originally manufactured for operation with higher current consuming lamps. The adaptive load circuit provides a mechanism whereby an existing traffic light control system is fooled into accepting use of a low current consuming lamp by creating a specifically timed signal during an interval that the traffic light control system normally checks to determined lamp load characteristics.

Abstract: Systems and methods for providing a self-driven synchronous rectification circuit for an active-clamp forward converter which includes automatically enhancing synchronous MOSFETs and maximizing input voltage range. The gate signals for the synchronous MOSFETs are derived from a unipolar magnetic coupling signal instead of a bipolarized magnetic coupling signal. The unipolar signal is retained for fully enhanced driving of the MOSFETs at low line voltage and the unipolar signal is automatically converted to a bipolar signal at high line amplitude due to line variance to maximize input voltage range by utilizing non-polarized characteristics of the MOSFET gate-to-source voltage (Vgs). The circuit permits efficient scaling for higher output voltages such as 12 volts DC or 15 volts DC, without requiring extra windings on the transformer of the forward converter.

Abstract: Embodiments of an apparatus comprising a light guide including a proximal end, a distal end, a display positioned near the proximal end, an ocular measurement camera positioned at or near the proximal end to image ocular measurement radiation, a proximal optical element positioned in the light guide near the proximal end and a distal optical element positioned in the light guide near the distal end. The proximal optical element is optically coupled to the display, the ocular measurement camera and the distal optical element and the distal optical element is optically coupled to the proximal optical element, the ambient input region and an input/output optical element. Other embodiments are disclosed and claimed.

Abstract: A dimmable LED lamp assembly includes a power supply configured to receive an input power signal and produce a DC lamp current, a LED lamp coupled to the DC lamp current and configured to produce an amount of light corresponding to an amount of the DC lamp current, and a dimming controller coupled to the power supply and configured to adjust the amount of DC lamp current. The dimming controller is coupled to the input power signal and is further configured to determine a required dimming level based on the input power signal and to adjust the amount of DC lamp current such that the amount of light produced by the LED lamp corresponds to the determined required dimming level.

Abstract: A traffic lamp and a method of controlling the traffic lamp based on a power signal are provided. The traffic lamp can include a controller and a light emitting element When a plurality of light emitting elements is included in the traffic lamp, each light emitting element is coupled with a separate controller. Each controller can be configured to include a predetermined light emitting timing sequence for the corresponding light emitting element. When the power signal is supplied to the traffic lamp, each controller determines a power signal characteristic such as a frequency or a period of the power signal and controls a light output of the light emitting element: based on the power signal characteristic and the light emitting timing sequence. A plurality of light emitting elements can be synchronized using the power signal applied to the traffic lamp.

Abstract: The present disclosure provides a supplemental load circuit configured to provide a supplemental power consumption to enable a lamp unit operating at a low power consumption to operate with a traffic controller configured to test for a higher power consumption. The supplemental load circuit includes a load, power input circuitry configured to receive a DC power signal from the lamp unit, and a control switch configured to receive a control signal having a duty cycle from the lamp unit. The control switch is configured to control application of the DC power signal to the load by the power input circuitry based on the duty cycle of the control signal. The present disclosure also provides a method for enabling a lamp unit to operate with a traffic controller designed for higher power lamp units.

Abstract: An LED lamp assembly includes a power supply configured to receive an input power signal and provide a DC lamp current, a dimming controller coupled to the power supply and configured to adjust the DC lamp current, and an LED lamp coupled to the DC lamp current. The dimming controller is configured to determine if full brightness or dimmed brightness is required based at least in part on the input power signal. The DC lamp current is maintained at a first level when full brightness is required and at a second level when dimmed brightness is required.

Abstract: Systems and methods for assigning virtualized network elements to physical resources in a cloud computing environment are provided. A resource request is received as input indicating a required number of virtual machines and a set of virtual flows, each of the virtual flows indicating a connection between two virtual machines which need to communicate with one another. Each of the requested virtual machines is assigned to a physical server. The set of virtual flows can be modified to remove any virtual flow connecting virtual machines which have been assigned to the same physical server. Each of the virtual flows in the modified set is assigned to a physical link. If a bandwidth capacity of a requested virtual flow is greater than the available bandwidth of a single physical link between servers, multiple links can be allocated to the virtual flow.

Abstract: Systems and methods that provide control circuits having multiple sub-control inputs that control operation of a power electronics device (e.g., a power converter). Each of the multiple sub-control inputs are output from a separate sub-control circuit that includes a feedback circuit having an input tied to a common control node. The common control node is coupled to an input of a controller (e.g., a PWM controller). Outputs of each of the sub-control circuits are coupled to the common control node by a respective switch (e.g., diode, transistor, etc.) so that each of the sub-control circuits may be selectively coupled to the common control node to provide a control signal to a controller. Since components of each of the feedback compensations circuits are biased at a regulation voltage instead of a higher power supply voltage, the control circuit may switch between control modes with minimal delay.

Abstract: A safety flashing detector that suitably detects unintentional flashing of the LED light engine in a traffic lamp is provided. The LED light engine may flash unintentionally when there are failures (hardware or software) inside a traffic lamp. In certain embodiments, unintentional flashing may be detected using a current sensor. If unintentional flashing is detected, the flashing detector may activate and shut down the LED light engine to remove the hazardous failure and eventually triggers the fuse blowout circuit. Hardware circuitry is suitably employed for both reliability and safety purposes, but software may also be employed.

Abstract: The present disclosure provides a supplemental load circuit configured to provide a supplemental power consumption to enable a lamp unit operating at a low power consumption to operate with a traffic controller configured to test for a higher power consumption. The supplemental load circuit includes a load, power input circuitry configured to receive a DC power signal from the lamp unit, and a control switch configured to receive a control signal having a duty cycle from the lamp unit. The control switch is configured to control application of the DC power signal to the load by the power input circuitry based on the duty cycle of the control signal. The present disclosure also provides a method for enabling a lamp unit to operate with a traffic controller designed for higher power lamp units.

Abstract: A system and method for setting operating parameters of traffic lamps. A traffic lamp including a memory operates according to one or more operating parameters on the memory. A loading device external to the traffic lamp transfers one or more operating parameters to the traffic lamp, where the traffic lamp sets the operating parameters to the transferred operating parameters.