Patent ID: 9629208
Date: 2017-04-18
CPC Classifications: H02M,H05B

Claim:
1. A control circuit for controlling a power converter, the power converter connected to a light emitting diode circuit, the control circuit comprising: a detector for detecting an amplitude of at least one of a first voltage signal and a first current signal which are output by an electronic transformer, and a controller configured to bring the power converter into different modes, in response to a detection result from the detector, wherein the first current signal in the different modes comprises different amplitudes, the different amplitudes comprising at least one of: different constant values and different derivative values, wherein the controller is configured to: deactivate and activate the power converter alternatively, and change a behavior of the power converter for realizing the different modes during each half cycle of the electronic transformer, wherein the different modes comprise: (1) a first mode wherein an amplitude of the first current signal has a first constant value and a second mode wherein the amplitude of the first current signal has a second constant value larger than the first constant value, or, (2) a first mode wherein an amplitude of the first current signal has a first constant value and a second mode wherein the amplitude of the first current signal has a second constant value smaller than the first constant value and a third mode wherein an amplitude of the first current signal has a third constant value larger than the second constant value, or (3) a first mode wherein an amplitude of the first current signal has a first constant value and a second mode wherein the amplitude of the first current signal has a first positive derivative value and a third mode wherein the amplitude of the first current signal has a first negative derivative value, or (4) a first mode wherein an amplitude of the first current signal has a first negative derivative value and a second mode wherein the amplitude of the first current signal has a first positive derivative value and a third mode wherein the amplitude of the first current signal has a second negative derivative value and a fourth mode wherein the amplitude of the first current signal has a second positive derivative value, or (5) a first mode wherein an amplitude of the first current signal has a first constant value and a second mode wherein the amplitude of the first current signal has a second constant value larger than the first constant value and has a first positive derivative value, or (6) a first mode wherein an amplitude of the first current signal has a constant value and a second mode wherein the amplitude of the first current signal has a first positive derivative value and a third mode wherein the amplitude of the first current signal has a first negative derivative value and a fourth mode wherein the amplitude of the first current signal has a second positive derivative value and a fifth mode wherein the amplitude of the first current signal has a second negative derivative value.