Problems with constant power, constant voltage, and constant current

shaorc

【If you don't understand, just ask】 For constant power modules (such as power power supply) So I have the following questions [1] If it is constant power (such as switching power supply or linear power supply), how is this constant power determined? Does it refer to the power of the transformer in the power supply? Or something else? [2] For example, if the driver module has a 30A output, does it mean that the maximum output is 30A? Because the driver is connected to a load, the current is determined by the load? Thank you!

maychang

【1】If it is constant power (such as switching power supply or linear power supply), how is this constant power determined? Does it refer to the power of the transformer in the power supply? Or what? It refers to the power output at the output end (mostly DC, but AC cannot be ruled out)

maychang

【2】For example, if a driver module has a 30A output, does it mean that the maximum output is 30A? Because the driver is connected to a load, the current is determined by the load? This depends on the working state of the power supply. Constant voltage, constant current, and constant power are not three working states that can be used at the same time. Under any load condition, only one working state can be used.

qwqwqw2088

A constant power switching power supply has a constant output voltage and detects when the load current exceeds the rated value for protection. A typical example of constant power is the power supply for xenon car headlights, which was not popular in the past few years. This is constant power.