| MICROSEMI CORP. - ANALOG MIXED SIGNAL GROUP LTD. Patent applications |
| Patent application number | Title | Published |
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| 20120086361 | POWER SAVING ARRANGEMENT FOR USE WITH A USER IMPLEMENTABLE PHASE CUT DIMMER - A power saving arrangement for use with a phase cut dimmer, the power saving arrangement constituted of: a power converter arranged to convert a received alternating current power signal to a direct current signal; a detector arranged to detect the presence, or absence, of the phase cut dimmer blocking a portion of an alternating current mains power sine wave from reaching the power converter; and a controllable minimum holding current circuit in communication with the received alternating current power signal, the controllable minimum holding current circuit responsive to an output of the detector, wherein in the event that the detector detects the absence of the phase cut dimmer, the controllable minimum holding current circuit is disabled such that a minimum holding current is not provided. | 04-12-2012 |
| 20120081017 | LED STRING DRIVER WITH POWER FACTOR CORRECTOR AND CURRENT GOVERNOR - A solid state lighting controller arranged for use with a single stage power factor correction switched mode power supply, a light emitting diode (LED) string and a current sense element arranged to sense current through the LED string, the solid state lighting controller constituted of: a current governor in series with the LED string exhibiting a governor differential amplifier and a governor electronically controlled switch responsive to the output of the governor differential amplifier, the current governor arranged to limit current flow through the LED string responsive to a current limit reference; and a feedback circuit exhibiting an error amplifier, the feedback circuit arranged to feedback a signal to the power factor correction switched mode power supply controller whose value is a function of the difference between the current through the LED string sensed by the current sense element and a target current signal. | 04-05-2012 |
| 20110215852 | HIGH SPEED LATCH CIRCUIT WITH METASTABILITY TRAP AND FILTER - A synchronizer constituted of a first and second set of three serially coupled latches coupled to a common clocking signal, the first and the ultimate latch of the first set responsive to a first edge of a common clocking signal and the penultimate latch responsive to an opposing edge of the common clocking signal, the second set being respectively responsive to the respective complementary edges of the clocking signal; an input lead arranged to receive a signal to be synchronized, the input lead coupled to the input of the first latch of the first set and to the input of the first latch of the second set; and a filter arranged to pass the output of each of the first set and the second set responsive to the penultimate latch of the set exhibiting a consistent output for two consecutive opposing edges. | 09-08-2011 |
| 20110163605 | POWER OVER ETHERNET EXTENDER SUITABLE FOR USE WITH MULTIPLE POWERING ARRANGEMENTS - A power over Ethernet extender arranged to detect if power is received over 2 pairs of wires or over 4 pairs of wires. If power is received over 4 pairs of wires, power is output over only 2 pairs of wires. Preferably, the power signature of the received power is further detected. If the incoming power over a first 2 pairs of wires supports in excess of 13 watts of power consumption, and power is received over 4 pairs, then the output power supports in excess of 13 watts of power consumption; and if the incoming power over a first 2 pairs of wires supports in excess of 13 watts of power consumption, and power is not received over 4 pairs, then the output power does not support in excess of 13 watts of power consumption. | 07-07-2011 |
| 20100207531 | COLOR MANAGEMENT FOR FIELD-SEQUENTIAL LCD DISPLAY - A method of color control for a backlight utilizing colored light emitting diodes (LEDs), the method constituted of: providing a plurality of colored LED strings constituted of at least three different colors; lighting each of the plurality of colored LED strings to provide a backlight; providing a period wherein none of the colored LED strings are lit; obtaining during the provided period when none of the colored LED strings are lit, an indication of an ambient light; obtaining during the provided period when the colored LED strings are lit, an indication of the optical output of the colored LED strings; and controlling the lighting of the provided plurality of colored LED strings responsive to the received indication of ambient light and the received indication of the output of the colored LED strings. Preferably, the method is performed in cooperation with an on-board color sensor. | 08-19-2010 |
| 20100171626 | Enhanced Classification for Power Over Ethernet - A method of classification of power requirements in a power over Ethernet system, the method comprising: providing a first classification voltage for a first classification cycle time, the provided first classification voltage being within a classification voltage range defined by a lower classification voltage limit and upper classification voltage limit; measuring a first current flow responsive to the provided first classification voltage; subsequent to the first classification cycle time, providing a voltage outside of the classification voltage range for a classification indexing time; subsequent to the classification indexing time, providing a second classification voltage for a second classification cycle time, the provided second classification voltage being within the classification voltage range; measuring a second current flow responsive to the provided second classification voltage; determining a classification responsive to the measured first current flow and the measured second current flow; and allocating power responsive to the determined classification. | 07-08-2010 |
| 20100134018 | LED STRING DRIVER WITH LIGHT INTENSITY RESPONSIVE TO INPUT VOLTAGE - A driving arrangement for a plurality of light emitting diodes (LEDs), the driving arrangement constituted of: a plurality of serially connected first LEDs coupled to a source voltage; a plurality of first electronically controlled switches, each associated with a particular one of the plurality of serially connected first LEDs and arranged to provide, when closed, a bypass current path for the associated first LED; and a control circuitry coupled to a control terminal of each of the plurality of first electronically controlled switches, the control circuitry operative to close a number of the plurality of first electronic switches, the number responsive to a voltage level of the source voltage. | 06-03-2010 |
| 20100115299 | COMPENSATION FOR HIGH POWERED MIDSPAN POWER SOURCING EQUIPMENT - A midspan unit arranged to supply power to a powered device over data communication cabling constituted of a signal conditioner exhibiting a transfer function with a gain of not less than −0.4 dB as compared with: (K | 05-06-2010 |
| 20100072903 | Color and Intensity Control Over Power Wires - A control element for a luminaire constituted of a first and a second manually variable non-momentary impedance and a first and a second time dependent gating circuit, each responsive to a respective manually variable non-momentary impedance and operative to provide a time dependent gating of a respective polarity of an alternating current power signal, the amount of time of the gating reflecting the present value of the respective manually variable non-momentary impedance, wherein the first time dependent gating circuit and the second time dependent gating circuit are restrained to maintain a minimum predetermined power towards the solid state lighting unit. | 03-25-2010 |
| 20100046506 | SYSTEM AND METHOD FOR LOCATION IDENTIFICATION - A telecommunications outlet providing location identification in a local area network, the telecommunications outlet constituted of: a network side connection adapted to be connected to a networking device via horizontal cabling; a data terminal side connection adapted to be connected to a data terminal equipment; a control circuitry; a memory adapted for storage of multi-bit data; a transmitter in communication with the memory; and a first switch responsive to the control circuitry, the first switch arranged in a first mode to connect data from the network side connection to the data terminal side connection and in a second mode to connect data from the transmitter to the network side connection and disconnect data from the network side connection to the data terminal side connection. | 02-25-2010 |
| 20100045194 | POWERING AND CONTROLLING LIGHT EMITTING DIODES VIA THERMALLY SEPARATED ARRAYS OF DISSIPATIVE ACTIVE ELEMENTS - A chipset for powering and controlling a plurality of light emitting diode (LED) strings. The chipset includes a controller having a pulse width modulating (PWM) functionality and a data transfer interface circuitry; and at least one dissipative active element array comprising a plurality of dissipative active elements. The dissipative active element array(s) are packaged to be thermally separate from the controller. The PWM functionality is arranged to individually pulse width modulate a current flow through each of the LED strings. Each of the plurality of dissipative active elements is associated with a particular one of the plurality of LED strings and is arranged to limit the current flow of the pulse width modulated current that flows through the particular LED string to a value, the value being responsive to a value output by the controller via the data transfer interface circuitry. | 02-25-2010 |
| 20100030392 | Time Integrated Guard Band - An automated method of controlling a power managed system, such as a power over Ethernet system. The method is constituted of: establishing a power consumption budget for a plurality of loads; defining an overbudget limit and an associated time window; monitoring power consumption of the plurality of loads; determining, at a plurality of time intervals over the associated time window, an indication of excess power consumption for each of the plurality of time intervals, the indication of excess power consumption being a function of the monitored power consumption and the defined power consumption budget; and in the event that an integral over the associated time window of a function of the determined indications of excess power consumption exceeds the overbudget limit, disabling at least one load from consuming power. | 02-04-2010 |
| 20090302781 | COLOR MANAGER FOR BACKLIGHT SYSTEMS OPERATIVE AT MULTIPLE CURRENT LEVELS - A color manager for use with a luminaire constituted of a plurality of different colored light emitting diode based sub-luminaires arranged to produce a combined light. The color manager is constituted of a sampler arranged to output an electrical representation of the optical output of the luminaire, a converter coupled to the output of said sampler and operatively associated with a current selector arranged to select the driving current level of the luminaire from a plurality of current levels. The converter is arranged to convert said electrical representation to a pre-determined calorimetric system in cooperation with a calibration matrix whose values are selected responsive to the selected driving current level. The color manager further comprises a driver operatively associated with the luminaire, the converter and current selector and arranged to drive the luminaire in accordance with the driving current level as selected by the selector. | 12-10-2009 |
| 20090243565 | METHOD AND APPARATUS FOR DETECTING END OF START UP PHASE - A PSE configured to determine the end of the start up phase at the PD responsive to a condition of the voltage at the PSE output. In one particular embodiment, the startup phase end is determined responsive to a PSE output voltage within a predetermined range of the PSE input voltage. In another particular embodiment, the startup phase end is determined responsive to the voltage drop associated with the PSE current limiter being lower than a predetermined maximum. In yet another particular embodiment, the startup phase end is determined responsive to the absolute value of the rate of change of the PSE output voltage being lower than a predetermined value. In yet another particular embodiment, the startup phase end is determined responsive to the absolute value of the rate of change of the voltage drop associated with the PSE current limiter being lower than a predetermined value. | 10-01-2009 |
| 20090231354 | A Color Controller for a Luminaire - A color controller for a luminaire constituted of: a thru-converter operative to convert an input signal to at least one luminaire drive signal; an illumination sampler arranged to sample an output from the luminaire and generate a representation thereof; and a feedback controller arranged to receive the output representation and generate the updatable conversion factor in cooperation with calibration luminance and color values, wherein the thru-converter operation is responsive to a trigger signal for defining a first and a second mode, the first mode for generating the luminaire drive signal for the luminaire responsive to the input signal being a frame luminance signal and target color signals and wherein the conversion to the at least one luminaire drive signal is responsive to an updatable conversion factor, and the second mode for generating the luminaire drive signal for the luminaire responsive to the feedback controller. | 09-17-2009 |
| 20090112373 | POWER OVER ETHERNET PORT ENABLING AND DISABLING RESPONSIVE TO ACCESS CONTROL SYSTEM - An electronically controlled method of controlled enabling and disabling of ports, the method constituted of: receiving a message responsive to an access event, the message comprising an identifier of the accessing party and an indication of the access event; determining at least one power over Ethernet supplying port associated with the identifier of the accessing party; and enabling, in the event the indication of the access event is of entry, the determined at least one power over Ethernet supplying port associated with the identifier of the accessing party; and disabling, in the event the indication of the access event is of exit, the determined at least one power over Ethernet supplying port associated with the identifier of the accessing party. | 04-30-2009 |
| 20090021384 | Method of Sampling a Modulated Signal Driven Channel - An automated method of sampling an electrical condition of each of a plurality channels, the method comprising: driving each of the plurality of channels with a modulated signal; providing a settable flag associated with each of the plurality of channels; selecting one of the plurality of channels; identifying if the settable flag associated with the selected one of the plurality of channels is set; and in the event that the settable flag associated with the selected one of the plurality of channels is not set, and a function of the modulated signal of the selected one of the plurality of channels is active and stable: sampling an electrical condition of the selected one of the plurality of channels; and setting the provided settable flag associated with the selected one of the plurality of channels. | 01-22-2009 |
| 20090001253 | Optical Sampling and Control Element - An optical sampling and control element for use with a luminaire exhibiting a cycle and a frame, the optical sampling and control element being constituted of a color sensor in optical communication with the luminaire; and a sampler connected to the outputs of the color sensor, the sampler comprising an integrator arranged to integrate the outputs of the color sensor over a predetermined period less than the frame. | 01-01-2009 |
| 20090001252 | Brightness Control for Dynamic Scanning Backlight - A method of controlling the luminance of a luminaire on an individual frame basis, without affecting a slow acting color loop controlling the color temperature of the luminaire, the method comprising: receiving a reference value representative of a target color; receiving a luminance signal defining the luminance of the luminaire per frame; adjusting a modulated signal driving the luminaire directly responsive to the received luminance signal, thereby controlling the luminance of the luminaire per frame; sampling the optical output of the luminaire per frame; comparing a value responsive to the sampled optical output with a value responsive to the received reference value to output a difference signal; and further adjusting the modulated signal driving the luminaire responsive to the compared value so as to reduce the difference signal. | 01-01-2009 |
| 20080238341 | Color Control for Dynamic Scanning Backlight - A method of controlling the output of a luminaire by receiving a first target signal associated with a first frame; generating a first light output control signal for an on time portion of the first frame, the light output control signal responsive to the received first target signal; sampling a light output during the on time portion of the first frame, the light output being responsive to the first light output control signal; receiving a second target signal associated with a second frame, the second frame following the first frame; comparing the received second target signal with the sampled light output of the on time portion of the first frame; and generating an error signal responsive to the comparing. | 10-02-2008 |
