LED drive power is the power supply voltage or current which is converted to a specific current to drive the LED power converter, and constant current led driver is an ideal choice which may expensive than constant current. And today, we will talk about the distinction about these two kinds of type.

1. The so-called constant-current / constant voltage is within a certain range of the output current / voltage is kept constant. "Constant," the premise is within a certain range. For the "constant" is the output voltage is within a certain range, for "constant pressure" is the output current to be within a certain range. Beyond this range, "constant" cannot be maintained. So it will set the output current constant voltage source file (maximum output) parameters. In fact, the electronic world, there is no "constant" this thing has all power load regulation (load regulation) this indicator. Constant pressure (voltage) Source example: As you increase the load, the output voltage must be decreased.

2. When the enclosure power supply voltage change, and the current flowing through the load constant. When the power supply is a constant current through the load changes, the power supply voltage does not change simply use Ohm's law to understand occurs, the power is not directly connected to the load, the middle has a circuit.

3. The constant voltage source and the constant current source differences in definition:

1) Permitted under a constant voltage source in the load, the output voltage is constant and does not change with changes in load. Typically used in low-power LED modules, low-power LED light bar with more. Under the constant voltage source is, we often say that the power supply, to ensure that the load (output current) changing circumstances, to keep the voltage constant.

2) Constant current source in the permitted load, the current output is constant and does not change with load changes, usually used on high-end high-power LED and low-power products. * If the test from the good life, then, the constant current source LED driver a little better. In the case of a constant current source load changes, can adjust their own output voltage, the output current remains unchanged. We see basically the switching power supply voltage source, and the so-called "constant current switching power supply" is on the basis of constant voltage led driver, the output plus a small value sense resistor feedback to previous level to control for constant current control.

4. How to identify the parameters from the power supply is a constant voltage source or constant current source it? The label can be viewed from the power supply: If the output voltage of his identity is a constant value is a constant voltage source; if a voltage range is identified, which can be determined it is a constant current source.

5. The advantages and disadvantages of the constant current source of constant voltage source: a constant voltage source able to provide a constant load voltage, preferably a constant voltage source resistance is zero, a short circuit cannot be: a constant current source may provide a constant current to the load, the ideal constant current source resistance is infinite, cannot open.

6. LED work as a constant current of electronic components (operating voltage relatively fixed, which slightly offset, it will make a great change in current), only constant current mode, in order to truly ensure consistent brightness and long life. Constant pressure drive power at work, we need to add on the lamp module or constant current limiting resistor and constant current drive power just constant source of constant current module built.

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