The output of a high-power DC power supply is not absolutely constant. For example, when the DC power supply works at constant voltage, the output voltage will change slightly due to the change of input voltage or load. When DC power supply works at constant current, its output current will also cause small changes in output voltage due to changes in input voltage or load. To measure the extent of this variation, that is, to measure the stability of the DC supply, leads to the concept of load effects. Connecting a resistive load to the output of a DC power supply reduces the output voltage of the DC power supply. The variation in the output voltage is known as the load effect, and its magnitude depends on the load itself and the DC supply to which it is connected.

 

500kw load bank
 

The load effect will lead to two phenomena, which are as follows:

1. The connection status and output of the previous device or even the entire device will change.

2. The two devices form a new whole. Although some of the main characteristics of the original device are retained, the transfer function of the original device can no longer be expressed by series and parallel formulas.