Develop failsafe multi-chip LED module driver
The motive behind developing this driver was to provide an efficient and fault tolerant workhorse especially for integrated LED modules comprising medium and high-power LEDs configured in series or series-parallel combination. Unlike Solid State Lights made out of discrete power LEDs, the integrated LED chip has no room for replacement/repair of any faulty LED if it becomes open, shorted, or leaky due to electrical or thermal stress encountered during its operation. The circuit handles such mishaps and isolates the faulty string(s) without posing any penalty on power budget or affecting other strings working normally.
The proposed design idea uses a technique which allows the parallel-driven LED strings to work within a specified regulated current range by precisely injecting a reference current (IB) into multiple current sensitive switches to which LED string are tied, and accordingly adjusts its magnitude under normal and anticipated electrical faults, which might occur during its life time, and thus provides fault tolerant protection from imbalance of current in LED strings during short circuit, leaky, or open circuit conditions. Unlike other circuits, the simplicity, cost effectiveness, and efficiency of the circuit facilitates many additional advantages besides its ingenuity.
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