| Patent application number | Description | Published |
|---|
| 20080239761 | Forward power converter controllers - This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). | 10-02-2008 |
| 20080239762 | Forward power converter controllers - This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). | 10-02-2008 |
| 20080239764 | Forward power converter controllers - This invention relates to control techniques and controllers for resonant discontinuous forward power converters (RDFCs). | 10-02-2008 |
| 20090040796 | BIPOLAR TRANSISTOR DRIVERS - We describe a switching power converter comprising a bipolar switching device (BJT or IGBT) switching an inductive load, and including a closed-loop control system. The control system comprises a voltage sensing system to sense a voltage on a collector terminal of the switching device and provide a voltage sense signal; a controller; and a drive modulation system coupled to an output of the controller for modulating a drive to the control terminal of said bipolar switching device responsive to a controller control signal; wherein said controller is configured to monitor changes in the sensed voltage during a period when said switching device is switched on and to control said drive modulation system to control the degree of saturation of said bipolar switching device when the device is switched on and hence improve turn-off times. | 02-12-2009 |
| 20090237960 | SWITCH MODE POWER SUPPLY CONTROLLERS - This invention relates to SMPS controllers employing primary side sensing. We describe a system for identifying a knee point in a sensing waveform, at which the output voltage of the SMPS may be sampled accurately on the primary side. The system identifies the knee point by fitting a tangent to a portion of a power transformer voltage waveform, and samples the voltage waveform at the knee point to determine the SMPS output voltage. In preferred embodiments this technique is implemented using a decaying peak detector, providing a timing signal indicating detection of the knee point. Sample/hold and error amplifier circuits may be employed to achieve output voltage regulation. | 09-24-2009 |
| 20100085115 | SIGNAL GENERATOR - This invention generally relates to signal generation, clock signal generation and ramp signal generation, and trimming the temperature coefficient of a signal. | 04-08-2010 |
| 20100091525 | POWER CONVERTERS - We describe a resonant discontinuous power converter including a magnetic energy storage device, and a bipolar junction transistor (BJT) switch having a collector terminal coupled to repetitively switch power from the input on and off to said magnetic energy storage device such that power is transferred from the input to the output. During an off-period of said BJT switch a voltage on said magnetic energy storage device and on said collector terminal of said BJT is at least partially resonant. The power converter includes a voltage clamping circuit to clamp a base voltage on a base terminal of said BJT during a resonant portion of said off-period to limit an excursion of a collector voltage on said collector terminal of said BJT towards or beyond an emitter voltage of said BJT during said resonant portion of said off-period, in particular to inhibit reverse bias of a base emitter junction of the transistor. | 04-15-2010 |
