Abstract: 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.

Abstract: 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.

Abstract: A light emitting diode (LED) light source module includes a circuit substrate, a driving IC electrically coupled to the circuit substrate and having at least one input terminal and an output terminal, an LED coupled onto the circuit substrate and electrically coupled to an output terminal of the driving IC, and a packaging layer, having a transparent structure shaped by a colloidal solidification, such that the transparent structure is covered outside the driving IC and LED, and the LED light source module covers the driving IC and LED by the transparent structure of the packaging layer, and serves as a light source module of a lamp directly without the need of installing another driving IC to the lamp, and promotes its extensive use in LED lamps.

Abstract: A method for designing an LED driver circuit is disclosed, wherein the LED driver circuit serves to drive an LED circuit. The method includes the steps of: providing an LED driver circuit; calculating a design voltage and a design current; designing an actual driving voltage; designing a voltage output end voltage; and designing an actual driving current. The LED driver circuit includes a power source IC and a current-limiting resistor. The current-limiting resistor is electrically connected between a voltage output end and a voltage-regulating end of the power source IC. The actual driving current is designed by calculating the actual driving voltage and the voltage output end voltage according to the design voltage and by calculating the resistance value of the current-limiting resistor according to the design current. With the disclosed method, the design of an LED driver circuit capable of a stable and constant current can be rapidly completed.

Abstract: An LED light source module and a constant-current unit structure for use therewith are provided. The LED light source module includes a constant-current unit and an LED set. The constant-current unit includes a voltage stabilizing unit and a resistor. The resistor is parallel-connected between two output ends of the voltage stabilizing unit. An input end of the constant-current unit receives DC voltage, and one of the output ends of the constant-current unit outputs constant current. The LED set is electrically connected to the output end of the constant-current unit to receive constant current therefrom so as for the LED set to be powered-on. Regardless of fluctuation in the DC voltage received, the constant-current unit outputs stable constant current, and the LED set emits light steadily, thereby protecting the LED set against overcurrent-induced damage.