LED Device with Voltage-Limiting Unit and Voltage-Equalizing and Current Limiting Resistances

摘要

The present invention provides a LED device with voltage-limiting unit and voltage-equalizing and current-limiting resistances, in which a LED is connected in parallel with a voltage-limiting unit, and a current-limiting resistance is connected in series between the LED and the voltage-limiting unit, and two ends of each LED are connected in parallel with an voltage-equalizing resistance for forming a light-emitting unit, so that a light-emitting unit set can be structured through connecting two or more than two of the mentioned light-emitting units in series or in series-parallel in the same polarity; with the two ends of each LED being connected in parallel with the voltage-equalizing resistance, the end voltage of each light-emitting unit can be evenly stabilized; and the current-limiting resistance is connected in series between the connection joints of the LED and the voltage-limiting unit for limiting the shunt current passing through the voltage-limiting unit.

主权项

1. An LED device including at least one light emitting unit, said at least one light emitting unit comprising:
at least one light emitting diode (101); a voltage-limiting unit (105) including a semiconductor unit having a resistance that rapidly drops when subject to overvoltage; a voltage-equalizing resistance (107) including a first resistive unit parallel connected at two ends of said at least one light emitting diode (101); a current-limiting resistance (111) including a second resistive unit and installed between the light emitting diode (101) and the voltage-limiting unit (105); wherein the voltage-limiting unit (105) is series connected with the current-limiting resistance (111) and parallel-connected with both the voltage-equalizing resistance and the light emitting diode (101) to form a light emitting unit.