Under the condition of allowable load, the output voltage of the constant voltage power supply is constant and will not change with the change of the load. It is usually used in low-power LED modules and low-power LED light strips. The constant voltage power supply is what we often call a regulated power supply, which can ensure that the voltage remains unchanged when the load (output current) changes.
Under the condition of allowable load, the output current of the constant current power supply is constant and will not change with the change of the load. It is usually used in high-power LED products, and LED constant current is also used in high-end low-power LED products. power supply. If you want to prolong the life of LED products, the choice of LED power supply is very important, and constant current power supply is the best choice for LED. The constant current source can adjust its output voltage accordingly when the load changes, so that the output current remains unchanged.
How to distinguish between constant voltage source and constant current source by parameters:
Get an LED power supply, find the nameplate parameters, and find the key to output voltage
Parameters: If its voltage is nominally a constant value, it is a constant voltage source.
If it is a range value, it is a constant current source.
For example: there is a power supply whose output voltage is 12V,
We determine that this is a constant voltage power supply. If it is nominally 30-80V, then this power supply must be a constant current power supply.
Advantages and disadvantages of constant voltage power supply and constant current power supply:
Constant voltage power supply (stabilized power supply): A power supply capable of outputting a constant voltage to the load. The internal resistance of an ideal constant voltage power supply is zero, and it cannot be short-circuited during use.
Constant current power supply (constant current source): A power supply capable of outputting constant current to the load. The internal resistance of an ideal constant current power supply is infinite, and it cannot be opened when used.
