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Light emitting diode has been extensively used in lighting, ornamental lighting products, in the layout of LED lamps, must consider in order to ensure the standard work of Light emitting diode, to choose what sort of Light emitting diode as the series and parallel load, and led drivers, with sensible design.

1, Light emitting diode uses all series

The LED driver output high voltage demands. Distribution in different ends of the various LED voltage, present through each Light emitting diode of the sam-e, the brightness of LED agreement, when the LED uniformity difference is bigger.

When a LED lousy quality short-circuit, if the power-driven (such as for instance common resistance capacitance step-down way), as a result of drive output voltage steady, subsequently the allotment will be raised in the two endings of LED residual voltage, driver output current will rise, which is simple to damage the remainder of Light emitting diode. Like the use of constant-current LED driver, when a Light emitting diode of lousy quality as a result of short circuit, driver output current stays unchanged, doesn't change the remainder all the standard work of Light emitting diode.

When a LED lousy quality after disconnection, in series with the Light emitting diode won't bright. The alternative in each Light emitting diode is linked in parallel with a zener, of course is, the turn-on voltage of the zener voltage higher than Light emitting diode need to direct, otherwise LED is just not bright

2, Light emitting diode uses all in parallel way

LED driver output high current, load voltage reduced. In the sam e voltage is assigned by all the Light emitting diode at both ends, when the LED uniformity difference is bigger, and the existing of each Light emitting diode is not the same, led driver dimmable differs. Can choose the better consistency LED, suitable for the low-supply voltage products (such as for instance solar or battery powered).

 

When a LED lousy quality when disconnected, if the voltage type LED drive (such as for instance voltage switching power-supply), drives the output current will be decreased, without affecting the standard work of all Light emitting diode. The distribution increases in the remaining part of the LED current