Transient suppression systems and methods in electrical circuits
AssigneeMaxim Integrated Products, Inc.
InventorsSuresh HARIHARAN, Ron Vincent OCAMPO, Ramesh SELVARAJ
Life of this patent
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Abstract
The present disclosure relates generally to systems and methods for transient response improvements in electrical circuits. More particularly, the present disclosure relates to systems and methods for suppressing overshoot currents and overshoot durations in circuits using switching regulators, such as driver circuits for LED applications. Embodiments of the invention relate to an LED driver that utilizes transient suppression systems and method for LED applications.
Claims20
A method for controlling a light-emitting diode (LED) driver circuit to improve transient performance, the method comprising:
- using a comparator coupled to a current regulator to monitor a load current to detect an overshoot condition;
- operating a switch in a mode configured to limit the load current in a first array of LEDs;
- controlling the current regulator to reverse an inductor current that causes an output capacitor that is coupled to the comparator to discharge;
- and
- in response to detecting an absence of the overshoot condition, operating the switch in a regular mode.
A driver circuit for controlling a load current, the driver circuit comprising:
- a current regulator comprising an output capacitor and two sets of regulator switches, the current regulator uses a first control voltage to generate first capacitor output voltage;
- a comparator circuit coupled to the current regulator to detect an overshoot condition in a load current;
- a switch coupled to the comparator circuit to generate, in response to the comparator circuit detecting the overshoot condition, a limited load current by operating the switch in a current limit mode to control at least some of the load current in first array of LEDs;
- a controller coupled to the current regulator, the controller toggles between the two sets of regulator switches to discharge the output capacitor in the presence of the overshoot condition;
- a first compensation circuit that stores the first control voltage;
- and
- a second compensation circuit that stores a second control voltage, the first and second compensation circuits being controlled based on user input.
Dependencies are inferred from the claim text.