Patent application number | Description | Published |
20120146541 | CIRCUITRY TO CONTROL A SWITCHING REGULATOR - In one aspect, a circuit includes a switching regulator configured to provide power to a load, a current regulator circuit coupled to the load and a response circuit configured to provide a control signal to the switching regulator in response to electrical changes of the current regulator circuit. The control signal changes non-linearly with respect to the electrical changes at the current regulator circuit. | 06-14-2012 |
20120181939 | Electronic Circuits For Driving Series Connected Light Emitting Diode Strings - Electronic circuits provide an error signal to control a regulated output voltage signal generated by a controllable DC-DC converter for driving one or more series connected strings of light emitting diodes. | 07-19-2012 |
20120274228 | ELECTRONIC CIRCUITS AND METHODS FOR DRIVING A DIODE LOAD - A circuit for driving an LED load with a controllable converter includes a control circuit configured to turn off the converter in response to a PWM signal having a first level and to turn on the converter in response to the PWM signal having a second level. A load disconnect switch coupled in series with the LED load is also controlled by the PWM signal so that the load disconnect switch is opened when the PWM signal turns off the converter to thereby open the load current path. | 11-01-2012 |
20130009556 | Electronic Circuits and Techniques for Maintaining a Consistent Power Delivered to a Load - Circuits and methods used therein provide an adjustable average current through a load in accordance with a pulse width modulated (PWM) signal. A condition detection circuit is configured to identify a condition of the electronic circuit and to generate a condition signal indicative of the condition. A current extension circuit is coupled receive the condition signal and coupled to receive the PWM signal. The current extension circuit is configured to generate, at the output node of the current extension circuit, an extended PWM signal having a first state and a second state. The first state of the extended PWM signal longer in time than a first state of the PWM signal by an amount related to a value or a state of the condition signal. Current pulses through the load are extended to be longer in accordance with the extended PWM signal. | 01-10-2013 |
20130009557 | Electronic Circuits and Techniques for Improving a Short Duty Cycle Behavior of a DC-DC Converter Driving a Load - An electronic circuit, referred to as an on-time extension circuit herein, provides an ability to adjust a power delivered to a load by pulsing a predetermined current to the load. The on time of the a DC-DC converter used to provide the power iS extended to be longer than the on time of the current pulse when the on time of the current pulses becomes very short. | 01-10-2013 |
20130162152 | CIRCUITRY TO DRIVE PARALLEL LOADS SEQUENTIALLY - In one aspect, a circuit includes a plurality of comparators. Each comparator is configured to receive a first input from a corresponding load of a plurality of loads and to receive a second input as a regulation voltage. The circuit also includes an amplifier configured to receive signals provided by the plurality of comparators, a pulse-width modulation (PWM) circuit configured to receive a control signal from the amplifier and to provide a signal to a primary switch to control voltage provided to the loads and an output switch sequencer coupled to each of the comparators and configured to provide control signals to control switches coupled to the primary switch enabling one control switch to be active at a time. Each control switch provides a voltage increase to a respective load of the plurality of loads if enabled. | 06-27-2013 |
20140055045 | DC-DC Converter Using Hysteretic Control and Associated Methods - A control circuit used to control a DC-DC converter includes a duty cycle control unit to control a duty cycle of the DC-DC converter and a hysteretic control unit to maintain a voltage at an output of the DC-DC converter within a narrow range during certain operational time periods. The hysteretic control unit may maintain the converter output voltage within the range by alternately enabling and disabling the duty cycle control unit based on feedback from the DC-DC converter output. In at least one embodiment, the control circuit is used within LED driver circuitry for driving a plurality of LED channels. | 02-27-2014 |
20140055051 | LED Driver Having Priority Queue to Track Dominant LED Channel - An electronic circuit for driving a plurality of light emitting diode (LED) channels coupled to a common voltage node includes a priority queue for tracking a dominant LED channel. A queue manager may be provided to keep the priority queue updated during LED drive operations based on operating conditions associated with the LED channels. | 02-27-2014 |
20140055115 | METHODS AND APPARATUS FOR DC-DC CONVERTER HAVING DITHERED SLOPE COMPENSATION - Methods and apparatus for a circuit including a DC-DC converter comprising: a boost converter to provide a DC voltage output from a DC input voltage, the DC output voltage configured to connect with a first load terminal, a feedback module configured to connect with a second load terminal, a switching module having a switching element coupled to the boost converter, and a control circuit coupled to the switching module to control operation of the switching element, the control circuit coupled to the feedback module, wherein the control circuit includes a slope generator to generate a ramp signal having a slope that can vary cycle to cycle. | 02-27-2014 |
20140125236 | Electronic Circuits For Driving Series Connected Light Emitting Diode Strings - Electronic circuits provide an error signal to control a regulated output voltage signal generated by a controllable DC-DC converter for driving one or more series connected strings of light emitting diodes. | 05-08-2014 |
20140176018 | CIRCUITRY TO CONTROL A SWITCHING REGULATOR - In one aspect, a circuit includes a switching regulator configured to provide power to a load, a current regulator circuit coupled to the load and a response circuit configured to provide a control signal to the switching regulator in response to electrical changes of the current regulator circuit. The control signal changes non-linearly with respect to the electrical changes at the current regulator circuit. | 06-26-2014 |
20140210359 | Method And Apparatus To Control A DC-DC Converter - Control circuits and techniques are provided for use with DC-DC converters. The circuits and techniques may, in some implementations, be used with LED driver systems. In some embodiments control circuits are provided that rely on multiple different feedback paths to adjust a duty cycle of a DC-DC converter. In some embodiments, control circuits are provided that switch between multiple capacitors to provide as duty cycle control signal for use with a DC-DC converter. | 07-31-2014 |
20140266132 | RECONFIGURABLE SWITCHED CAPACITOR POWER CONVERTER TECHNIQUES - An apparatus for converting a first voltage into a second voltage includes a reconfigurable switched capacitor power converter having a selectable conversion gain. converter includes a cascade multiplier switched capacitor network having capacitors, each of which electrically connects to a stack node and to a phase node. A controller causes the network to transition between first and second operation modes. In the first mode, at least one capacitor is isolated from a charge transfer path of the reconfigurable switched capacitor power converter. Consequently, in the first mode of operation, the power converter operates with a first gain. In the second mode, the power converter operates with a second conversion gain. Meanwhile, a third voltage across the at least one capacitor is free to assume any value. | 09-18-2014 |
20140268945 | RECONFIGURABLE SWITCHED CAPACITOR POWER CONVERTER TECHNIQUES - An apparatus for converting a first voltage into a second voltage includes a reconfigurable switched capacitor power converter having a selectable conversion gain. converter includes a cascade multiplier switched capacitor network having capacitors, each of which electrically connects to a stack node and to a phase node. A controller causes the network to transition between first and second operation modes. In the first mode, at least one capacitor is isolated from a charge transfer path of the reconfigurable switched capacitor power converter. Consequently, in the first mode of operation, the power converter operates with a first gain. In the second mode, the power converter operates with a second conversion gain. Meanwhile, a third voltage across the at least one capacitor is free to assume any value. | 09-18-2014 |
20140312914 | System and Method for Measuring Battery Voltage - An apparatus and method for measuring battery voltage includes a first capacitor configured to receive a charge from a battery. A first switch may be configured to selectively couple the first capacitor to the battery. A second capacitor may be coupled to a reference potential. A second switch may be configured to selectively couple the second capacitor to the first capacitor to transfer at least a portion of the charge on the first capacitor to the second capacitor. | 10-23-2014 |
20140327479 | EFFICIENT GATE DRIVERS FOR SWITCHED CAPACITOR CONVERTERS - An apparatus for converting voltage includes terminals coupled to external circuits at corresponding voltages and a switching network having driving circuits and semiconductor switches that interconnect capacitors in successive states to one another and to the terminals. The switches interconnect some capacitors to one another through a series of switches when an activation pattern causes them to be activated. Each driving circuit has power connections, a control input, and a drive output coupled to and controlling at least one switch. A drive output of one of them couples to and drives each switch. Some of the driving circuits are powered via corresponding power connections from at least one of the capacitors such that a voltage across the corresponding power connections is less than a highest of the corresponding voltages. The terminals and the switching network are constituents of a switched capacitor converter. | 11-06-2014 |
20150077175 | CHARGE PUMP TIMING CONTROL - Cycle timing of a charge pump is adapted according to monitoring of operating characteristics of a charge pump and/or peripheral elements coupled to the charge pump. In some examples, this adaptation provides maximum or near maximum cycle times while avoiding violation of predefine constraints (e.g., operating limits) in the charge pump and/or peripheral elements. | 03-19-2015 |
20150077176 | PARTIAL ADIABATIC CONVERSION - Operation of a charge pump is controlled to optimize power conversion efficiency by using an adiabatic mode with some operating characteristics and a non-adiabatic mode with other characteristics. The control is implemented by controlling a configurable circuit at the output of the charge pump. | 03-19-2015 |