Light source device with light-emitting diode module

摘要

A light source device with an LED module includes a load module. The load module includes 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. An input end of the voltage-regulating unit is connected to a positive end of a voltage source. The voltage-regulating unit generates a stable voltage difference of less than 1.6V between the first and second output ends. The LED module receives a residual voltage equal to the result of subtracting from the output voltage of the voltage source the voltage difference consumed by the load module. The amount by which the residual voltage exceeds the operating voltage required for the entire LED string never exceeds safe voltage values. Even if a voltage source changes, the voltage-regulating unit can still generate a stable voltage difference and a stable current.

主权项

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:
the resistance value=(the voltage difference generated by the voltage-regulating unit)/(the operating current required by the LEDs).