Power supply for LED illumination

摘要

An LED illumination system includes: a load including an LED lamp; and a power supply device, the LED lamp configured to be physically mounted on and demounted from the power supply device, the power supply device comprising: a current feedback control unit; a first voltage comparison unit configured to determine whether the load is in a mounted state; a voltage feedback control unit configured to decrease the voltage of the power supply device to a safe voltage when demounting, and to increase the voltage of the power supply device to perform the constant current control when mounting; and a semiconductor switch element connected in series between the load and the detection resistor, wherein the mounted and demounted states of the load is detected by a voltage of a main electrode of a high potential side of the semiconductor switch element.

主权项

1. An LED illumination system comprising
a load including an LED lamp, the LED lamp including at least one LED row having a plurality of LED elements connected in series to each other, the at least one LED row being connected in parallel to each other; and a power supply device configured to supply a direct current power to the load, the LED lamp configured to be physically mounted on and demounted from the power supply device, the power supply device comprising: a current feedback control unit having a detection resistor to detect an electric current flowing through the load, wherein the current feedback control unit is configured to compare a value of the electric current detected on the detection resistor with a predetermined reference value, thereby performing a constant current control; a first voltage comparison unit configured to determine whether the load is in a demounted state, according to a value of an output voltage of the power supply device; a voltage feedback control unit configured to decrease the voltage of the power supply device to a safe voltage when the load is demounted from a mounted state, and to increase the voltage of the power supply device to perform the constant current control when the load is mounted from the demounted state; and a semiconductor switch element connected in series between the load and the detection resistor, wherein the mounted and demounted states of the load is detected by a voltage of a main electrode of a high potential side of the semiconductor switch element.