AC DIRECT DRIVE LED POWER SUPPLY CAPABLE OF HANDLING OVERVOLTAGE

摘要

An alternative current (AC) direct drive light emitting diode (LED) power supply handling an overvoltage. The AC direct drive LED power supply includes a power input unit receiving AC power, a rectifier unit for generating an undulating current by rectifying the AC power, an LED array unit connected to receive the undulating current from the rectifier unit and formed of one or more LED modules, a constant current control unit connected to the LED array unit at a connecting point and controlling so as to allow a certain rated current or less to flow by modifying a waveform of the undulating current applied to the LED array unit, and a voltage-based current control unit adjusting the undulating current flow according to the voltage level at the connecting point.

主权项

1. An alternative current (AC) direct drive light emitting diode (LED) power supply handling an overvoltage, comprising:
a power input unit receiving AC power; a rectifier unit generating an undulating current by rectifying the AC power outputted from the power input unit; an LED array unit connected to receive the undulating current from the rectifier unit and formed of one or more LED modules; a constant current control unit connected to the LED array unit at a connecting point and controlling the undulating current so as not to exceed a predetermined current value by modifying a waveform of the undulating current applied to the LED array unit, wherein the undulating current generated by the rectifier is provided to the constant current control unit after passing through the LED array unit; and a voltage-based current control unit connected to the LED array unit and the constant current control unit at the connecting point, wherein when a voltage level at the connecting point is higher than a certain level, the voltage-based current control unit decreases the undulating current flow as the voltage level at the connecting point increases, and the voltage-based current control unit increases the undulating current flow as the voltage level at the connecting point decreases.