LINEAR BYPASS ELECTRICAL CIRCUIT FOR DRIVING LED STRINGS

摘要

An electrical circuit for driving a light emitting diode (LED) string is described. The electrical circuit includes a first LED string having one or more color LED strings. A first current control transistor is coupled in series with the first LED string. A color bypass transistor may couple in parallel to one of the one or more color LED strings. A second LED string may also be coupled to the first LED string at an anode terminal of both LED strings. The second LED string may be coupled in parallel with a string bypass transistor and in series with a second current control transistor. Connection interfaces to control terminals of the first current control transistor, the color bypass transistor, the second current control transistor, and the string bypass transistor enable a control device to operate these transistors in linear mode to drive the LED strings.

主权项

1. A method of manufacturing an electrical circuit for driving a light emitting diode (LED) based lamp comprising:
providing a first LED string including one or more LEDs; electrically coupling a first current control transistor to the first LED string in series with the first LED string, the first current control transistor capable of operating in a linear mode for current to flow through the first LED string and the first current control transistor; electrically coupling a second LED string to the first LED string at an anode terminal of both the first LED string and the second LED string, the second LED string including one or more color strings, each of the one or more color strings including at least one LED, the one or more color strings coupled in series; electrically coupling a second current control transistor in series with the second LED string, the second current control transistor capable of operating in a linear mode for current to flow through the second LED string and the second current control transistor; and electrically coupling a color bypass transistor in parallel to a particular color string of the one or more color strings, the color bypass transistor capable of operating in a linear mode for the color bypass transistor to bypass at least a portion of current through the particular color string.