LED lighting system with a multiple mode current control dimming strategy
JL Melanson - US Patent 7,759,881, 2010 - Google Patents
A light emitting diode (LED) lighting system includes a controller to control current in one or
more LEDs in response to a dimming level input. The LED lighting system implements a …
more LEDs in response to a dimming level input. The LED lighting system implements a …
Power control system for current regulated light sources
JL Melanson - US Patent 7,804,256, 2010 - Google Patents
(57) ABSTRACT A light emitting diode (LED) lighting system includes a PFC and output
Voltage controller and a LED lighting power sys tem. The controller advantageously …
Voltage controller and a LED lighting power sys tem. The controller advantageously …
Ballast for light emitting diode light sources
JL Melanson - US Patent 7,852,017, 2010 - Google Patents
438 436 voltage indicates a particular dimming level. The drive cur rent varies for different
dimming levels. However, the light source ballast controls drive current so that the drive …
dimming levels. However, the light source ballast controls drive current so that the drive …
Power factor correction (PFC) controller and method using a finite state machine to adjust the duty cycle of a PWM control signal
JL Melanson - US Patent 7,821,237, 2010 - Google Patents
US PATENT DOCUMENTS 6,958,920 B2 10/2005 Mednik et al. 6,967,448 B2 11/2005
Morgan et al. 4,797.633 A 1989 Humphrey 6,970.503 B1 1 1/2005 Kalb 4,940,929 A 7/1990 …
Morgan et al. 4,797.633 A 1989 Humphrey 6,970.503 B1 1 1/2005 Kalb 4,940,929 A 7/1990 …
Delta sigma modulator with unavailable output values
K Nanda, JL Melanson - US Patent 7,755,525, 2010 - Google Patents
A power control system includes a delta sigma modulator to generate output values for use
in controlling a switching power converter. In at least one embodiment, the delta sigma …
in controlling a switching power converter. In at least one embodiment, the delta sigma …
History-independent noise-immune modulated transformer-coupled gate control signaling method and apparatus
JL Melanson - US Patent 7,804,697, 2010 - Google Patents
(57) ABSTRACT A history-independent and noise-immune modulated trans former-coupled
gate control signaling method and apparatus provides robust design characteristics in …
gate control signaling method and apparatus provides robust design characteristics in …