| 摘要 |
A high efficiency AC LED driver circuit has a rectifier unit, an LED light string, multiple voltage controlled transistors, a current detection unit, and a power efficiency control unit. The rectifier unit is connected to an AC power and converts the AC power into a pulsating DC power. The LED light string is connected to the rectifier unit and has multiple LED units. The voltage controlled transistors are respectively and electrically connected to each LED unit and form multiple shunt circuits. The current detection unit is electrically connected to the voltage controlled transistors. The power efficiency control unit is electrically connected to the current detection unit, series nodes between the LED units and the control terminals of the voltage controlled transistors; wherein the power efficiency control unit adjusts loop current based on a voltage drop of each LED unit. |
