Patent ID: 8907575
Filing Date: 2014-12-09
Classification: H05B,Y02B

Abstract:
1. A light source device with a light-emitting diode module (LED module), comprising: a load module comprising a voltage-regulating unit and a constant current controlling unit parallel-connected between a first output end and a second output end of the voltage-regulating unit, wherein an input end of the voltage-regulating unit is connected to a positive end of a voltage source, and the voltage-regulating unit generates a stable voltage difference between the first output end and the second output end, the voltage difference being less than 1.6V; and the LED module connected between the second output end of the voltage-regulating unit and a negative end of the voltage source to receive a residual voltage equal to a result of subtracting from the output voltage of the voltage source the voltage difference consumed by the load module, wherein the LED module has at least an LED string including a plurality of LEDs connected in series, wherein an operating voltage required for the at least an LED string in its entirety is less than or equal to the residual voltage, wherein an amount by which the residual voltage exceeds the operating voltage required for the at least an LED string in its entirety does not exceed a safe voltage value, wherein the constant current controlling unit provides a resistance value, such that the constant current controlling unit is configured by the resistance value as follows: