Led driving circuit and led driving controller
AssigneeGreen Solution Technology Co., Ltd.
InventorChung-Che Yu
Life of this patent
Estimating the term…
Abstract
The present invention discloses an LED driving circuit and controller, capable of maintaining an average value of a current flowing through an LED module at a predetermined current value. The LED driving circuit and controller compensates influences of any factors deviating the average value of the current flowing through the LED module by modulating a period of constant on time or constant off time, or by modulating the determining value(s) of current peak value and/or current valley value according to a difference between an actual average value and the preset current value.
Claims12
An LED driving controller, utilized for controlling a switching converter circuit to supply a driving power to an LED module, the LED driving controller comprising:
- a comparator unit, generating a comparison result signal according to a current detecting signal representing an amount of a current flowing through the LED module;
- a switch control unit, generating a switch control signal according to the comparison result signal and a predetermined time period to control a switch module of the switching converter circuit;
- and
- a current corrective unit, generating a current corrective signal in response to the current detecting signal to adjust the predetermined time period, thereby stabilize an average value of the current flowing through the LED module at a predetermined current value.
An LED driving controller, utilized for controlling a switching converter circuit to supply a driving power to an LED module, the LED driving controller comprising:
- a current corrective unit, generating at least a reference signal according to a current detecting signal representing an amount of a current flowing through the LED module;
- a comparator unit, generating a comparison result signal according to the current detecting signal and the least a reference signal;
- and
- a switch control unit, generating a switch control signal in response to the comparison result signal to control a switch module of the switching converter circuit.
An LED driving circuit, comprising:
- an LED module;
- an inductance, coupled to one end of the LED module;
- a flywheel unit, coupled to the LED module and the inductance, for providing a current loop;
- a switch module, coupled to the LED module for controlling a power from an input power source whether to supply to the LED module or not;
- and
- an LED driving controller, utilized for cyclically turning the switch module on or off for a predetermined time period in response to a current detecting signal representing an amount of a current flowing through the LED module, wherein the predetermined time period is adjusted according to the current detecting signal to substantially stabilize an average value of the current flowing through the LED module at a predetermined current value.
Dependencies are inferred from the claim text.