| 摘要 |
A device and method for controlling current output to current driven loads such as active light emitting diodes (LEDs) and, more particularly, a device and method for controlling current to an array of active LED strings that are disposed in series. The device generates a square wave AC current that flows through primary windings of plural isolation transformers whose primary windings are electrically connected in series. The device includes a current regulator that produces a regulated DC current that is proportional to a current reference; a free running inverter that converts the DC current to square wave AC current; and plural isolation transformers whose secondary windings are electrically connected to LED strings.
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