LED driving device and lighting device

摘要

An LED driving device that performs a dimming operation of an LED module, the device includes: a dimming controller that receives the dimming instruction signal and generates a dimming signal; and a driving circuit that supplies an output current to the LED module based on the dimming signal generated by the dimming controller, wherein the driving circuit unit includes: a converter controller that generates a drive signal based on the dimming signal and outputs the drive signal to a first switching element; a first current setting circuit; and a second current setting circuit that is connected in parallel to the first current setting circuit, and wherein the dimming controller controls an operating state of the second current setting circuit to switch an adjustment range of the output current and a change characteristic of the output current in response to the dimming signal.

主权项

1. An LED (light emitting diode) driving device that performs a dimming operation of an LED module according to a dimming instruction signal, the device comprising:
a dimming controller that receives the dimming instruction signal and generates a dimming signal according to the dimming instruction signal; and a driving circuit that supplies an output current to the LED module based on the dimming signal generated by the dimming controller, wherein the driving circuit unit includes:
a converter controller that generates a drive signal based on the dimming signal and outputs the drive signal to a first switching element;a first current setting circuit that is connected between the first switching element and a ground; anda second current setting circuit that is connected in parallel to the first current setting circuit, and wherein the dimming controller controls an operating state of the second current setting circuit to switch an adjustment range of the output current in response to the dimming signal and a change characteristic of the output current in response to the dimming signal, wherein the adjustment range of the output current becomes a first output current adjustment range when the operating state of the second current setting circuit is set to an ON state by the dimming controller, and wherein the adjustment range of the output current becomes a second output current adjustment range when the operating state of the second current setting circuit is set to an OFF state by the dimming controller.