Patent application number | Description | Published |
20150295500 | SAMPLING FOR DIMMER EDGE DETECTION IN POWER CONVERTER - A controller and a method for controlling a power converter includes a sample block coupled to generate a first, second, and third sample by sampling an input sense signal that is representative of an input voltage of the power converter. An enable signal is asserted when a first difference between the first sample and the second sample exceeds a first threshold. An edge signal is asserted when both the enable signal is asserted and a second difference between the first sample and the third sample exceeds a second threshold. A drive circuit is coupled to output a drive signal in response to the edge signal. The drive signal is for controlling a switch coupled to regulate an output of the power converter. | 10-15-2015 |
20150303812 | DIMMING EDGE DETECTION FOR POWER CONVERTER - A controller for a power converter includes an edge detection circuit and a drive circuit. The edge detection circuit includes a comparator, a count module, and an edge checking module. The comparator is coupled to output a compare signal in response to comparing an input sense signal and a count signal. The input sense signal is representative of an input voltage of the power converter. The count module is coupled to adjust the count signal to track the input sense signal in response to receiving the compare signal. The edge checking module is coupled to output at least one edge signal in response to the compare signal. The drive circuit is coupled to output a drive signal in response to the at least one edge signal. The drive signal is for controlling a switch coupled to regulate an output of the power converter. | 10-22-2015 |
20150333630 | MULTI-PACE CONTROLLER - A controller for controlling a power supply includes a feedback signal generator to generate a feedback signal representative of an output current in response to an output sense signal. A state selector circuit receives the feedback signal and outputs a digital state signal to set an operational state of a switch of the power supply. The state selector circuit adjusts the digital state signal in response to feedback information at an end of a feedback period. A driver circuit receives the digital state signal and generates a drive signal in response to the digital state signal. The drive signal drives switching of the switch in accordance with the operational state of the switch. | 11-19-2015 |
20150333764 | DIGITAL-TO-ANALOG CONVERTER CIRCUIT FOR USE IN A POWER CONVERTER - A digital-to-analog converter circuit includes an input to receive a digital input signal having multiple bits. A modulation circuit is coupled to respond to less significant bits of the digital input signal by outputting a modulation signal that alternates between a logic low level and a logic high level. A digital-to-analog circuit is configured to convert more significant bits of the digital input signal to a first analog level. The digital-to-analog circuit is configured to alternate an analog output between the first analog level corresponding to a value of the more significant bits and a second analog level corresponding to one of adjacent values of the more significant bits in response to the modulation signal. | 11-19-2015 |
20150366010 | LINE RIPPLE COMPENSATION FOR SHIMMERLESS LED DRIVER - A power converter controller includes an oscillator, a drive circuit, and a frequency modulator. The drive circuit receives a clock signal from the oscillator and generates a drive signal in response thereto to control switching of a switch of the power converter. The frequency modulator controls the frequency of the clock signal in response to an inductor voltage across an inductor of the energy transfer element to reduce a peak-to-peak ripple value in an output current of the power converter. The frequency modulator controls the frequency of the clock signal during each line half cycle to be a fixed frequency when the inductor voltage is less than or equal to a threshold voltage. When the inductor voltage is greater than the threshold voltage the frequency modulator varies the frequency to be less than the fixed frequency to adjust a shape of an input current of the power converter. | 12-17-2015 |
20160006341 | TRAILING EDGE DETECTOR USING CURRENT COLLAPSE - A controller for a power converter compares a voltage sense signal to a first reference and compares a current sense signal to a current sense signal. The voltage sense signal is representative of an input voltage of the power converter. The current sense signal is representative of a current through the power converter. A slope of the voltage sense signal is measured over time. An edge detection is asserted by the controller when (1) the voltage sense signal is larger than the first reference, (2) the current sense signal is lower than the second reference, and (3) the slope is a negative slope. | 01-07-2016 |
20160079867 | TRAILING EDGE DETECTOR USING CURRENT COLLAPSE - A controller for a power converter includes an edge detection circuit including a first circuit coupled to coupled to compare a voltage sense signal representative of an input voltage to a first reference, and a second circuit coupled to compare a current sense signal representative of an input current to a second reference. A slope sense circuit is coupled to measure a slope of the voltage sense signal over time. An edge driver circuit is coupled to generate an edge signal that indicates that an edge has been determined when the voltage sense signal is greater than the first reference, the current sense signal is lower than the second reference, and the slope is negative. A drive circuit is coupled to output a drive signal in response to the edge signal. The drive signal is for controlling a switch coupled to regulate an output of the power converter. | 03-17-2016 |
20160111962 | CONTROLLER SUPPLY TERMINAL BOOSTING - A power conversion device includes a power switch a first main terminal coupled to a higher potential portion, a second main terminal coupled to a lower potential portion, and a tap coupled to the first main terminal to provide a current for charging a supply terminal capacitor. A controller is coupled to a control terminal of the power switch to control switching of the power switch to produce a regulated output. A supply terminal is to be coupled to a supply terminal capacitor to store a charge for supplying power to at least some of the components of the controller. A voltage regulator is coupled to regulate the charge stored and a potential on the supply terminal capacitor. The current for charging the supply terminal capacitor is selectively drawn from the tap of the power switch in response to the supply terminal capacitor being below a threshold. | 04-21-2016 |