Constant current drive means that the current flowing through the LED is kept constant. When the external interference makes the current increase or decrease, the LED current can return to the preset value under the regulation of the constant current circuit.
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Because the LED has nonlinear I-V characteristics, small voltage fluctuations will cause large current fluctuations, so the use of constant current drive LED can achieve better performance.
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According to the working state of the main power device, the constant current drive can be divided into linear constant current and switching constant current.
Constant current drive generally refers to a constant output current power supply, compared to the commonly used constant voltage voltage is usually used for a few special equipment in recent years because of the rise of led lighting and is familiar to the public. led lamp bead is actually a light-emitting diode, according to its volt-ampere characteristic curve, the appropriate power supply is a constant current drive type, so it is now widely used.