Patent application number | Description | Published |
20080284388 | METHODS AND APPARATUS TO HANDLE A REFERENCE VOLTAGE CHANGE IN A DIGITAL POWER SUPPLY - An example disclosed method to handle a reference voltage change in a digital power supply includes receiving a first value associated with a first reference voltage having a first voltage magnitude at a digital signal processor of a digital power supply, comparing the first reference voltage to an output voltage of the digital power supply, controlling the digital power supply based on the comparison between the first reference voltage and the output voltage, receiving a second value associated with a second reference voltage having a second voltage magnitude, determining that the first voltage magnitude is different than the second voltage magnitude, in response to determining that the second voltage magnitude is different than the first voltage magnitude, determining a voltage profile, and controlling the digital power supply based on the voltage profile. | 11-20-2008 |
20080284399 | METHODS AND APPARATUS FOR CONTROLLING A DIGITAL POWER SUPPLY - Methods and apparatus for controlling a digital power supply are disclosed. An example method includes storing a first set of coefficients for controlling a digital power supply in a memory of the digital power supply, associating the first set of coefficients with a first set of characteristics of an input voltage for the digital power supply, storing a second set of coefficients for controlling the digital power supply in the memory of the digital power supply, associating the second set of coefficients with a second set of characteristics of the input voltage, receiving a first voltage from a voltage source at the digital power supply, determining that the first voltage has the first set of characteristics, and, in response to determining that the first voltage has the first set of characteristics, applying the first set of coefficients to the digital power supply. | 11-20-2008 |
20080284400 | METHODS AND APPARATUS TO MONITOR A DIGITAL POWER SUPPLY - Methods and apparatus to monitor a digital power supply are disclosed. An example method includes receiving a voltage from a voltage source at a digital power supply, controlling the voltage using a power factor controller and a direct current (DC) to DC converter to generate an output voltage, controlling the output voltage using a signal processor to generate control signals based on receiving instructions, controlling the power factor controller and the DC to DC converter with a digital signal processor using the control signals, and copying an operating parameter from a register or a memory location of the digital signal processor to a memory buffer of the digital power supply. | 11-20-2008 |
20080284401 | METHODS AND APPARATUS TO CONTROL A DIGITAL POWER SUPPLY - Methods and apparatus to control a digital power supply are disclosed. An example method includes calculating a duty cycle of a pulse width modulated signal to control an output of a digital power supply, initializing an output of a counter that forms a pulse width modulator to increment by a first increment up to a counter maximum value for a first period and to decrement by the first increment for a second period, dividing the duty cycle by a constant to determine a multiple of the duty cycle to apply to each power stage of the power supply, calculating a first threshold percent by subtracting the multiple of the duty cycle from one hundred percent, setting a first threshold to be the first threshold percent multiplied by the counter maximum value, and controlling the power factor controller based on the first threshold. | 11-20-2008 |
20080285313 | METHODS AND APPARATUS TO CONTROL A DIGITAL POWER SUPPLY - Methods and apparatus to control a digital power supply are disclosed. An example method includes controlling a power factor controller by: receiving a first current signal flowing in a first stage of the power factor controller, receiving a second current signal flowing in a second stage of the power factor controller, determining a difference between the first current signal and the second current signal, determining if the magnitude of a measured current signal is above a predetermined threshold, activating an integrator to integrate the difference when the magnitude of the measured current signal is above a predetermined threshold, and outputting a first control signal and a second control signal to the power factor controller based on the output of the integrator. | 11-20-2008 |
20080288201 | "METHODS AND APPARATUS TO MEASURE A TRANSFER FUNCTION OF A CONTROL SYSTEM" - Methods and apparatus to measure a transfer function of a control system are disclosed. An example method includes receiving a first signal from the power supply at a first point in the control loop at a digital signal processor, instructing the digital signal processor to add a reference signal having a predetermined frequency and a predetermined amplitude to the first signal to generate a combined signal in the digital signal processor, using the combined signal to generate a control signal for the power stage, sampling the control signal at a second point around the control loop in the digital signal processor to generate a sampled signal, comparing the sampled signal to the reference signal to determine a transfer function of the digital power supply, and displaying the transfer function on a user interface. | 11-20-2008 |
20110150106 | System and Method for Bi-Phase Modulation Decoding - One embodiment of the present invention includes a decoder system that decodes a bi-phase modulated signal to generate an output code. The system includes a first filter associated with a first logic state configured to generate a first dot product of a plurality of consecutive digital samples of the bi-phase modulated signal and a respective plurality of tap weights of the first filter. The system also includes a second filter associated with a second logic state configured to generate a second dot product of the plurality of consecutive digital samples of the bi-phase modulated signal with a respective plurality of tap weights of the second filter. The system further includes a comparator configured to compare the first and second dot products and to provide the output code as a bit having one of the first logic state and the second logic state based on the comparison. | 06-23-2011 |
20110158329 | SYSTEM AND METHOD FOR BI-PHASE MODULATION DECODING - One embodiment of the present invention includes a decoder system that decodes a bi-phase modulated signal. The system includes a buffer configured to store a first plurality of digital samples associated with a first bit of the bi-phase modulated signal and a second plurality of digital samples associated with a second bit of the bi-phase modulated signal. The first bit can immediately precede the second bit. The system also includes a first summer configured to add the first plurality of digital samples to generate a first sum and a second summer configured to add the second plurality of digital samples to generate a second sum. The system further includes a comparator configured to compare the first sum and the second sum to determine an edge-transition between the first bit and the second bit, and to determine a logic-state of the first bit based on the edge-transition. | 06-30-2011 |
20110279297 | Analog-to-Digital Conversion - One embodiment of the present invention includes an analog-to-digital converter (ADC) system. The system includes an ADC configured to generate digital samples that are digital versions of at least one analog signal at a sampling frequency and a memory configured to store data corresponding to an average value of the digital samples in at least one register. The system further includes a processor configured to access the data corresponding to the average value for processing at an access frequency that is less than the sampling frequency. | 11-17-2011 |
20120077537 | SYSTEMS AND METHODS OF WIRELESS POWER TRANSFER WITH INTERFERENCE DETECTION - Performance of wireless charging systems may be significantly degraded when parasitic metal objects come in close proximity to the transmitting coil. Some of the transmitted energy may be coupled by these metal objects and wasted as heat. This may create a danger as the metal objects may get hot enough to create a fire hazard, to cause plastic parts deformation, or operator skin burns when touched. | 03-29-2012 |
20120256620 | Systems and Methods of Detecting a Change in Object Presence in a Magnetic Field - The systems and methods of detecting a change in object presence in a magnetic field disclosed herein inject a low amplitude signal near the resonant frequency into the coil until the system comes to equilibrium. At this point the feedback is measured. The feedback signal can be measured as at least one of several signals, for example, but not limited to the voltage on the resonant capacitor, the current in the coil, and the voltage between the resonant capacitor and the coil. A change in the steady state response indicates a change in device presence. | 10-11-2012 |
20120326657 | BI-PHASE COMMUNICATION DEMODULATION TECHNIQUES - One aspect of the present invention includes a bi-phase communication receiver system. The system includes an analog-to-digital converter (ADC) configured to sample a bi-phase modulation signal to generate digital samples of the bi-phase modulation signal. The system also includes a bi-phase signal decoder configured to decode the bi-phase modulation signal based on the digital samples. The system further includes a preamble detector comprising a digital filter configured to evaluate the digital samples to generate an output and to detect a preamble of the bi-phase modulation signal for decoding the bi-phase modulation signal based on the output. | 12-27-2012 |
20130147280 | WIRELESS POWER SYSTEM AND METHOD - A wireless power system and method are provided that employ a hybrid approach to adjusting transmission power to take advantages of the best features of frequency mode adjusting and duty cycle mode adjusting. The wireless system and method attempt to modify duty cycle as a first adjustment, unless the duty cycle adjustment causes the duty cycle to be outside a predefined range. If the duty cycle adjustment causes the duty cycle to be outside a predefined range, the wireless system and method employ frequency mode adjusting to adjust transmission power. | 06-13-2013 |
20130181539 | ADAPTIVE WIRELESS POWER TRANSFER SYSTEM AND METHOD - A system for wireless power transfer is provided. The system includes a monitoring function to monitor control parameters and an input source that supplies power to a wireless power transmitter, wherein the wireless power transmitter operates with a wireless power receiver to supply a charging current to a load. A controller can be configured to receive the control parameters from the monitoring function and to control an adjustable operating point for the wireless power transmitter which controls the charging current delivered to the load via the wireless power receiver, wherein the controller commands a maximum power operating point for the wireless power transmitter when the input source is detected at or above a predetermined threshold and commands a reduced power operating point for the wireless power transmitter when the input source to the wireless power transmitter is detected below the predetermined threshold. | 07-18-2013 |
20130307348 | Systems and Methods of Reduction of Parasitic Losses in a Wireless Power System - Example embodiments of the systems and methods of reduction of parasitic losses in a wireless power system disclosed herein provide a practical means of accurately estimating parasitic losses in a wireless power transfer system irrespective of coupling. Such systems and methods may be used to generate an equation which predicts parasitic losses in a wireless power system. In an offset case, in which the transmitter and receiver are not directly coupled, losses associated with the recirculating current in the primary LC tank dominate the loss, and the transmitted power may be better estimated by measuring the power inputs, power outputs, and injected losses in a controlled environment; making a mathematical fit to an equation, which from the various power measurements and injected loss, predicts the expected transmitter losses; and then, in an operational environment, using the equation to predict parasitic losses based on the power inputs, power outputs and expected loss equation. | 11-21-2013 |