LED driver and integrated dimmer and switch

• US 8,754,585 B1
• Filed: 11/26/2008
• Issued: 06/17/2014
• Est. Priority Date: 11/30/2007
• Status: Active Grant

• Current Assignee: E E Micro, LLC
• Original Assignee: E E Micro, LLC
• Inventors: Bahrehmand, Farhad
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): LUONG, HENRY T
• Application Number:
  US12/324,200
• Time in Patent Office: 2,029 Days
• Field of Search: 315/291, 315/307, 315/308, 315/DIG.4, 323/318, 323/351
• US Class Current: 315/291
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/375 using buck topology

Abstract

An LED driver includes an LED driver circuit adapted to receive a 110 volt AC current and to rectify the AC current into a low voltage DC output current; a PWM generator including control means to generate a PWM signal with an adjustable duty cycle; means operatively connecting the PWM generator to the LED driver circuit to provide the driver circuit with the PWM signal, the LED driver circuit generating a fixed frequency pulse in which the pulse width is modulated proportional to the PWM signal duty cycle to control LED brightness, wherein the driver circuit, the PWM generator and the connecting means are sized to fit within a standard 110 volt AC outlet box.

Claims

1. An LED driver for on/off and dimming of LEDs comprising

a. a switching LED driver circuit adapted to directly connect to 110 volt AC mains and to rectify said AC current into a regulated low voltage DC output current to drive one or more LEDs;

b. a PWM generator including control means to generate a PWM signal with an adjustable duty cycle wherein the LEDs are dimmed by adjustment to the pulse width in the duty cycle;

c. a lead between the LED driver circuit and the PWM generator to provide a low voltage DC output to the PWM generator to supply power to the PWM generator;

d. an ON/OFF switch for serially connecting said PWM generator to said LED driver circuit to provide said driver circuit with said PWM signal,

d.1 wherein said control means comprises analog components and a potentiometer operatively connected to said analog components, said potentiometer is operable by an end user;

d.2 said analog components comprising circuitry responsive to the potentiometer adapted to generate a PWM signal with a fixed frequency high enough to avoid eye detectable flickering and with a duty cycle having a modulated pulse width controlled by said potentiometer;

d.3 said LED driver circuit being adapted to generate a fixed frequency pulse at a frequency high enough to avoid eye detectable flickering in which the pulse width is modulated proportional to said PWM signal duty cycle to control LED brightness;

e. components “

a”

, “

b”

, “

c”

, and “

d”

being an integrated unit sized small enough to fit within a standard 110 volt AC outlet box.

2. The LED driver of claim 1 wherein said PWM generator has a low power consumption that allows the generator to be powered by the low voltage supplied by the LED driver circuit and said on/off switch is integrated with said potentiometer.

3. The LED driver of claim 1 further including a 110 volt AC outlet box wherein said outlet box includes a cover plate and said control means is positioned in said cover plate, said LED driver being adapted to receive said 110 volt AC current from inside said outlet box.

4. The LED driver of claim 1 wherein said driver circuit has a capacity to power a cluster of LED large enough to provide chandelier lighting.

5. The LED driver of claim 4 wherein said driver circuit provides a regulated DC current equal to that required by said cluster of LEDs.

6. An LED driver for on/off and dimming of LEDs comprising

a. a switching LED driver circuit adapted to directly connect to 110 volt AC mains and to rectify said AC current into a regulated low voltage DC output current to drive one or more LEDs;

b. a PWM generator to generate a PWM signal with an adjustable duty cycle, said PWM generator comprising

b1. a microcontroller,

b2. a control means comprising one or more momentary push-button ON/OFF switches, and

b3. means operatively connecting said control means with said microcontroller, said microcontroller being programmed to monitor said switches for short and long closures wherein the duty cycle of the PWM signal is controlled by said microcontroller in response to short and long closures of said momentary switches,

c. a lead between the LED driver circuit and the PWM generator to provide a low voltage DC output to the PWM generator to supply power to the PWM generator,

d. means to provide said LED driver circuit with said PWM signal, said LED driver circuit generating a fixed frequency pulse in which a pulse width is modulated proportional to said PWM signal duty cycle to control LED brightness and the frequency is high enough to avoid eye detectable flickering,

e. components “

a”

, “

b”

, “

c”

, and “

d”

being an integrated unit sized small enough to fit within a 110 volt AC outlet box.

7. The LED driver of claim 6 further including a 110 volt AC outlet box and components “

a”

, “

b”

, “

c”

, and “

d”

being within said outlet box, said LED driver being adapted to receive said 110 volt AC current from inside said control box.

8. The LED driver of claim 7 wherein said outlet box includes a cover plate and said control means is positioned in said cover plate.

9. The LED driver of claim 6 wherein said driver circuit has a capacity to power a cluster of LEDs large enough to provide chandelier lighting.

10. The LED driver of claim 9 wherein said driver circuit provides a regulated DC current equal to that required by said cluster of LEDs.