| Patent application number | Description | Published |
|---|
| 20090302774 | CONTROL CIRCUIT AND METHOD FOR REGULATING AVERAGE INDUCTOR CURRENT IN A SWITCHING CONVERTER - A switching power converter has an input voltage source. An output load is coupled to the input voltage source. An inductive element is coupled to the load. A switch is coupled to the inductive element. A current reference input is provided. A control circuit is coupled to the switch and the current reference input for activating and deactivating the switch. The inductive element receives power from the input voltage source when the switch is activated and conducting continuous current. The control circuit deactivates the switch after a controlled delay time when the current in the inductive element and the switch exceeds the current reference input so that an average current in the inductive element is determined by a magnitude of the current reference input. | 12-10-2009 |
| 20100118572 | LED DRIVER WITH LOW HARMONIC DISTORTION OF INPUT AC CURRENT AND METHODS OF CONTROLLING THE SAME - A power supply circuit for powering a load at constant current has a rectifier stage for receiving an AC voltage input and for producing a first substantially DC voltage. A first capacitor is attached to the load. A charge-pump is attached to an output of the rectifier stage and to the load for providing power factor correction and for converting the first substantially DC voltage to a second substantially DC voltage at the first capacitor. The charge pump is prevented from conducting energy back into the output of the rectifier stage. The charge pump delivers energy to a charge pump output, the energy being delivered directly instead of being stored. A converter stage is attached to the load and the first capacitor. The converter stage is used for converting voltages at the first capacitor and the charge pump to an output DC current. The converter stage has a switch for periodically connecting a first series-coupled circuit of the charge pump to the output of the rectifier stage. | 05-13-2010 |
| 20130187551 | Method and System for Driving LEDs from a Source of Rectified AC Voltage - The present inventions relate to a control circuit for controlling a plurality of serially connected groups of LEDs. A control unit is connected in parallel to each group of a plurality of serially connected groups of LEDs. Each LED group is connected to the adjacent group of LEDs. The control unit is connected to a group of LEDs. The control unit performs the functions of voltage regulating/current regulating/bypass for the associated group of LEDs. The control unit can act as a by-pass unit permitting current to flow through the control unit rather than through the associated group of LEDs. | 07-25-2013 |
| 20140347021 | SAMPLING NEGATIVE COIL CURRENT IN A SWITCHING POWER CONVERTER AND METHOD THEREOF - An electronic circuit and method for sampling negative coil current in a power converter includes a zero crossing detector and a sample-and-hold circuit. A switch determines whether a charging or discharging current is flowing through a coil. | 11-27-2014 |
| 20140376285 | Auxiliary Power Supplies - The invention relates to auxiliary power supplies. | 12-25-2014 |
| 20150016166 | Line Current Reference Generator - The invention generally relates to the field of power factor correction and specifically to generation of a reference waveform which is proportional to line voltage and is controllable in amplitude. | 01-15-2015 |
| 20150022168 | OUTPUT CURRENT CONTROL IN A BOUNDARY CONDUCTION MODE BUCK CONVERTER - A switching power converter has an input voltage source. An output load is coupled to the input voltage source. An inductive element is coupled to the load. A switch is coupled to the inductive element. A control circuit is coupled to the switch and the inductive element for activating and deactivating the switch, the control circuit activating and deactivating the switch based on a negative voltage drop across a resistive element of the control circuit. | 01-22-2015 |
| 20150372594 | CIRCUIT AND METHOD FOR ACTIVE CROSSTALK REDUCTION IN MULTIPLE-CHANNEL POWER SUPPLY CONTROLLERS - A comparator sense input is disconnected from a current sense resistor for the duration of a switching transition in an adjacent channel(s). Instead, the sense input receives a signal of the magnitude and the slew rate sampled prior to the transition. | 12-24-2015 |
