Xantrex Technology XDC manual Power Supply Regulation Modes

Operation

Power Supply Regulation Modes

Power Supply Regulation Modes

The power supply has 3 regulation modes while in the Normal Operation State:

•Constant Voltage (CV)

•Constant Current (CC)

•Constant Power (CP)

The CV, CC, and CP annunciators indicate the regulation mode.

Constant In this mode, the supply’s output voltage is constant while the current and power Voltage (CV) vary with the load. The power supply will operate in constant voltage mode

whenever the load current IL is less than the current limit setting ISET, or: IL<ISET. (IL=VSET/RL). In constant voltage mode, the power supply maintains the output voltage at the selected value (VSET) while the load current IL varies with the load requirements.

Constant In this mode, the supply’s output current is constant while the voltage and power Current (CC) vary with the load. The power supply will operate in constant current mode

whenever the load resistance is low enough that the load current IL is equal to the current limit setting ISET. (VL=ISETRL). In constant current mode, the power supply maintains the output current at the selected value (ISET) while the load voltage VL varies with the load requirements.

Constant In this mode, the supply’s output power is constant while the voltage and current Power (CP) vary with the load resistance. The power supply will operate in Constant Power

mode when the power drawn by the load is equal to the power setpoint and the product of the voltage and current setpoint (VSET and ISET) is greater than the power limit point (PSET). In Constant Power mode, the power supply maintains the output power at the selected value (PSET) while the load voltage VL and load current IL varies with the load requirements. The power limit is normally set to the maximum supply rating, so the Constant Voltage or Constant Current modes will always be in effect without entering into the Constant Power mode of operation.

Automatic This feature allows the power supply to automatically switch operating modes in Mode response to changing load requirements. If, for example, the power supply was

Crossover operating in Constant Voltage (CV) Mode (IL < ISET), and the load changed so the load current (IL) became EQUAL TO the current limit setting (ISET), the power supply would automatically switch into Constant Current (CC) Mode and the output voltage would vary in response to changes in load current. If the additional load was subsequently removed so the load current was again LESS THAN the current limit setting, the supply would automatically return to Constant Voltage (CV) Mode.

Release 3.0 59