LED illumination systems
OwnerRobert Beland, Giampaolo Carliinventors
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Abstract
An illumination system includes a power supply having a boost converter operating in the discontinuous conduction mode, a flyback converter operating in the critical conduction mode, and a switch coupled to the flyback converter. Several light emitting diodes receive power from the power supply. The boost converter may include a boost inductor (LB) and a boost diode (DB), constructed to perform the boost power factor correction (PFC) function. The flyback converter may includes a flyback inductor (LFB) and a flyback diode (DFB) and the power supply may be constructed to turn on the switch around the point where the current flowing in the flyback inductor reaches zero value.
Claims30
An illumination system, comprising:
- a power supply including a boost converter operating in the discontinuous conduction mode, a flyback converter operating in the critical conduction mode, and a switch coupled to said flyback converter;
- and
- several light emitting diodes receiving power from said power supply.
An illumination system, comprising:
- a power supply including a boost converter operating in a discontinuous conduction mode, a flyback converter operating in a critical conduction mode, and a switch coupled to said flyback converter, wherein said boost converter includes a boost inductor and a boost diode, and said flyback converter includes a flyback inductor and a flyback diode and said power supply is constructed to turn on said switch as the current flowing in said flyback inductor reaches zero value;
- and
- several light emitting diodes receiving power from said power supply.
An illumination method, comprising the steps of:
- providing a power supply including a boost converter, a flyback converter, and a switch coupled to said flyback converter;
- operating said boost converter in the discontinuous conduction mode, and operating said flyback converter in the critical conduction mode;
- and
- delivering current to several light emitting diodes.
A power supply comprising:
- a boost converter including a boost inductor and a boost diode and operating in the discontinuous conduction mode;
- a flyback converter including a flyback inductor and a flyback diode and operating in the critical conduction mode;
- and
- a switch coupled to said flyback converter and being connected to turn on at complete discharge of said flyback inductor for said operation in the critical conduction mode.
Dependencies are inferred from the claim text.