The constant current power supply is a type of power device that can provide a stable current output, regardless of load changes, input voltage fluctuations, or other external environmental changes. The constant current power supply can ensure that the output current value remains unchanged. It keeps the output current constant by controlling the output voltage.A constant current power supply can provide a stable current output within its normal operating range (i.e., when the load resistance is less than a certain critical value and the output voltage of the power supply has not reached its upper limit). This stable output current value is limited by a safety upper limit (set value) to prevent overcurrent damage to the equipment.   The working principle of a constant current power supply Modern desktop power supplies typically monitor the output and can determine in real time how much current is being drawn by the load. For a normal voltage source, when the load resistance is reduced, it can lead to a sharp increase in current, which may damage the load. In contrast, a constant current power supply uses its internal feedback control loop to actively reduce the output voltage when it detects an upward trend in current. This way, the current is precisely maintained at its set value, thereby avoiding the risk of uncontrolled current flow. In this mode, the power supply automatically adjusts its output voltage to ensure that the current remains at the set value. This is typically achieved through a feedback control loop, where