Patent
Method and apparatus for controlling current supplied to electronic devices
TLDR
In this article, a voltage conversion means based on an input control signal converts the magnitude of the voltage from the power supply to another magnitude that is desired at the high side of the load.Abstract:
The present invention provides a drive and control apparatus provides a desired switched current to a load including a string of one or more electronic devices. A voltage conversion means, based on an input control signal converts the magnitude of the voltage from the power supply to another magnitude that is desired at the high side of the load. A dimming control means provides control for activation and deactivation of the load and may further provide a means for current limiting. A feedback means is coupled to the voltage conversion means and a current sensing means and provides a control signal to the voltage conversion means that is indicative of voltage drop across the current sensing means which represents the current flowing through the load. Based on the control signal received, the voltage conversion means can subsequently adjust its output voltage such that a constant switched current is provided to the load.read more
Citations
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References
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Patent
Switched constant current driving and control circuit
TL;DR: In this paper, the driving and control device according to the present invention provides a desired switched current to a load including a string of one or more electronic devices, and comprises one or multiple voltage conversion means, one or several dimming control means, feedback means and one or many sensing means.
Patent
LED driver circuit with PWM output
TL;DR: The driver circuit for light emitting diodes (LEDs) of the present invention provides power to LEDs using pulse width modulation (PWM), and the driver circuit 100 uses current feedback to adjust power to LED arrays 54 and provides a full light and a dim mode as mentioned in this paper.
Patent
LED driver circuit and method
TL;DR: In this paper, an LED driver circuit and method are disclosed where an array of light emitting diodes have a transistor connected to each respective array of LEMD, and an oscillator is connected to the PWM controller.
Patent
Closed loop current control circuit and method thereof
TL;DR: In this paper, a circuit and method for providing closed loop control using constant current switching techniques is described, where the LED arrays are connected through an inductor to a current switching control section that switches current to ground or recirculates the current to maintain LED current flow within a desired range.
Patent
Sample and hold method to achieve square-wave PWM current source for light emitting diode arrays
Chin Chang,Bernd Clauberg +1 more
TL;DR: In this paper, an apparatus for controlling overshoots in the switching of LED arrays in a system having a switching voltage converter providing the biasing voltage for the LED array is presented.