| 摘要 |
An LED light string employs a plurality of electrical components defined by LEDs and sockets wired in block series-parallel, where the one or more series blocks, each driven at the same input voltage as the source voltage (110 VAC or 220 VAC), are coupled in parallel. The LED light string interfaces to the source voltage using a common household plug; it may also include a corresponding common, household socket, coupled in electrical parallel, to enable multiple light strings to be connected to each other from end to end. In order to directly drive a network of diodes without current-limiting circuitry, the voltage of each series block of diodes must be matched to the input source voltage. This voltage matching requirement for direct AC drive places fundamental restrictions on the number of diodes on each diode series block, depending on the types of diodes used. For the voltage to be "matched," it is possible to employ LED assemblies of different resistance values; e.g., the LED assemblies may emit different colors or be formed with a dedicated resistor (e.g., drop down resistor) integrally formed as part of at least one of the LED assemblies.
|
