CIRCUITS AND METHODS FOR DRIVING LIGHT SOURCES
First Claim
1. A dimming controller comprising:
- a voltage control terminal configured to provide a driving signal to control a control switch coupled to a first light element, wherein when said dimming controller operates in a first mode, said driving signal controls said control switch to operate alternately in a first state and a second state to adjust a first current flowing through said first light element to a target level, and wherein when said dimming controller operates in a second mode, said driving signal controls said control switch to operate in said second state to cut off said first current; and
a high voltage terminal, coupled to said voltage control terminal and also coupled to a second light element via a control circuit, configured to conduct a current flowing through said control circuit and said second light element when said dimming controller operates in said second mode,wherein said control circuit is coupled to said second light element and is configured to conduct a second current flowing through said second light element during operation in said second mode.
1 Assignment
0 Petitions
Accused Products
Abstract
A dimming controller can operate in a first mode or a second mode to control dimming of a light source. A voltage control terminal provides a driving signal to control a control switch. When the dimming controller operates in the first mode, the driving signal controls the control switch in a first state and a second state alternately to adjust a first current flowing through the first light element to a target level. When the dimming controller operates in the second mode, the driving signal controls the control switch in the second state to cut off the first current. A high voltage terminal conducts a current flowing through the control circuit and the second light element when the dimming controller operates in the second mode. The control circuit conducts a second current flowing through the second light element during the second mode.
63 Citations
25 Claims
-
1. A dimming controller comprising:
-
a voltage control terminal configured to provide a driving signal to control a control switch coupled to a first light element, wherein when said dimming controller operates in a first mode, said driving signal controls said control switch to operate alternately in a first state and a second state to adjust a first current flowing through said first light element to a target level, and wherein when said dimming controller operates in a second mode, said driving signal controls said control switch to operate in said second state to cut off said first current; and a high voltage terminal, coupled to said voltage control terminal and also coupled to a second light element via a control circuit, configured to conduct a current flowing through said control circuit and said second light element when said dimming controller operates in said second mode, wherein said control circuit is coupled to said second light element and is configured to conduct a second current flowing through said second light element during operation in said second mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An electronic system comprising:
-
a dimming controller configured to detect a dimming request signal indicative of an operation of a power switch, and operate in a mode selected from a first mode and a second mode to control dimming of a light source in response to said dimming request signal, wherein said light source comprises a first light element and a second light element; a buck-boost power converter coupled to said dimming controller, configured to provide power to said first light element when said dimmer controller operates in said first mode; a control circuit coupled to said dimming controller, configured to control said second light element to be powered on when said dimmer controller operates in said second mode, wherein during operation in said first mode, said dimming controller controls said control circuit to turn off said second light element and adjusts a first current flowing through said first light element, and wherein during operation in said second mode, said dimming controller conducts a current flowing through said control circuit and said second light element to turn on said second light element, and controls said first current to be cut off. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A method for adjusting power for a light source, comprising:
-
receiving a switch monitoring signal indicative of a conductance status of a power switch coupled to a power source; selecting an operation mode from at least a first mode and a second mode according to said switch monitoring signal; controlling a control switch to operate at a first state and a second state alternately to adjust a first current flowing through a first light element to a target current if said first mode is selected; operating a control circuit coupled to a second light element to cut off a second current flowing through said second light element if said first mode is selected; conducting said second current flowing through said second light element if said second mode is selected; and cutting off said first current flowing through said first light element if said second mode is selected. - View Dependent Claims (23, 24, 25)
-
Specification