Miguel Rivera Morales

US Patent:

7348948, Mar 25, 2008

Filed:

Jul 12, 2004

Appl. No.:

10/889308

Inventors:

Ian D. Crawford - Longwood FL, US
John Harwick - Sanford FL, US
Miguel Morales - Winter Springs FL, US

Assignee:

Analog Modules, Inc - Longwood FL

International Classification:

G09G 3/32

US Classification:

345 82

Abstract:

A driver supplying a total current to a load has a plurality (n) of driver stages (ST. . . STn). One stage is a master stage. Each driver stage has a switching device (Q) and an inductor (L) connected in series between the switching device and the output of the driver stage. The switching devices are turned ON in sequence with one another, during a cycle time (Tc) which is determined by sensing current through the inductor (L) in the master stage. When the switching device is turned ON current through the inductor rises, when the inductor current reaches the value of a demanded current the switch is turned OFF, and after the switch is turned OFF the inductor continues to supply (output) current to the load with a current which ramps down. A rectifying device (D) connected between the inductor and the supply line allows current to continue to flow in the inductor and be supplied to the load after the switch is turned OFF.

US Patent:

7262584, Aug 28, 2007

Filed:

Feb 9, 2005

Appl. No.:

11/054349

Inventors:

Ian D. Crawford - Longwood FL, US
Miguel Morales - Winter Springs FL, US

Assignee:

Analog Modules, Inc - Longwood FL

International Classification:

G05F 1/59

US Classification:

323272, 3151691, 323282

Abstract:

A capacitor is connected to the output of a multiphase power converter, and a current-driven device (e. g. , LED or laser diode) is also connected to the power converter output. A solid state switch (FET or IGBT) is connected in series with the current-driven device. Means are provided for sensing current through the current-driven device. An error amplifier compares sensed current through the current-driven device with a current level demand signal and controls the output of the power converter. Means are provided for turning the switch on and off and may be (i) a fast comparator receiving a voltage reference signal at one input and the current level demand signal at another input, and outputting the switch on/off signal to the switch or (ii) an externally-generated logic signal provided directly to the switch.