Basics on Constant Voltage CV and Constant Current CC
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A physical demonstration of constant voltage and constant current modes of the power supply.
Typically, a DC Power Supply acts primarily as a constant voltage source. Most of our power supplies can also act as a low frequency Current Source in CC mode. A Constant Voltage power supply typically has a large output capacitor which provides a very stable output voltage. This prevents the power supply from having a good Constant Current mode of operation. As you go up in frequency the output capacitor makes the output impedance lower. A Constant Current source should have high output impedance at all frequencies.
The reason there are so few true Constant Current sources is because most equipment uses Constant Input Voltage. Our solar array simulator is an example of a supply that acts primarily as a current source and we also have a family of supplies the N678XA that do a good job of behaving as a current source. LED lighting is another technologies that can benefit from a constant current source. LEDs are driven with a current as the means of regulating the amount of light output not voltage.
