Three-level LED bulb microprocessor-based driver

摘要

An LED bulb is described, comprising LEDs within a shell and a driver circuit to operate the LEDs at a plurality of brightness levels. The driver circuit comprises first and second inputs to receive AC, a neutral input, a converter circuit, first and second rectifier circuits, a detector circuit, and a processing circuit. The first rectifier circuit is connected to the first and neutral inputs and rectifies the AC received. The second rectifier circuit is connected to the second and neutral inputs and rectifies the AC received. The detector circuit is connected to the first and second rectifier circuits. The processing circuit has a first and a second processor input, and is connected to the detector circuit. The processing circuit produces a chop signal with a duty cycle based on whether the first or second input is hot. The converter circuit powers the LEDs based on the chop signal.

主权项

1. A light emitting diode (LED) bulb comprising:
a shell; a plurality of LEDs within the shell; and a driver circuit configured to operate the plurality of LEDs at a plurality of brightness levels, the driver circuit comprising:
a first input configured to receive alternating current (AC);a second input configured to receive AC;a neutral input;a converter circuit connected to the plurality of LEDs;a first rectifier circuit connected to the first input and the neutral input, the first rectifier circuit configured to rectify the AC received at the first input into direct current (DC);a second rectifier circuit connected to the second input and the neutral input, the second rectifier circuit configured to rectify the AC received at the second input into DC;one or more detector circuits, the one or more detector circuits connected to the first rectifier circuit and the second rectifier circuit;a signal processing circuit having a first processor input and a second processor input, the signal processing circuit connected to the one or more detector circuits; andwherein the signal processing circuit is configured to produce a chop signal with a duty cycle, the duty cycle based on whether the first input is hot and whether the second input is hot; andwherein the converter circuit powers the plurality of LEDs at a driving current, the driving current based on the chop signal.