Constant Current Vs Constant Voltage Power Supply

Accurate constant current constant voltage 20a power supply ensures safe charging of supercaps and li ion batteries. Although the voltage stays constant the current required from the driver goes up with the number of lights. Both constant current and constant voltage drivers act as a power supply for an led light source but the delivery methods differ.

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The term constant is relative.

Constant current vs constant voltage power supply.

In order for that light strip to be installed in a home with a 120 volt alternating current ac wiring system the voltage would need to be reduced and converted from ac to dc with a power supply. Luminaires require a steady voltage to be supplied from the driver eg 12 or 24 volts. Just because leds are constant current devices doesn t mean that they require a constant current power supply. Constant voltage lights are always wired in parallel.

In some cases constant voltage power supplies might be best. The important thing to keep in mind is whether the output of the power device provides a constant voltage or a constant current they are required by the led device that is receiving the power. In some cases constant current drivers matching the voltage and current requirements of both the product and the power source home vehicle etc. We compare constant current led drivers and constant voltage led drivers to help you pick the perfect led power supply for your application.

For these lights the voltage is fixed by the driver but the current may vary. Similar to ballasts for fluorescent lamps or transformers for low voltage bulbs led drivers provide and regulate the necessary voltage in order to maintain a safe and consistent operation. A cc power source will maintain current at a relatively constant level regardless of fairly large changes in voltage while a cv power source will maintain voltage at a relatively constant. This is the type of power that is typically output from your wall outlets around the home.

By joshua caldwell download pdf many applications require a power supply that can accurately regulate a voltage and accurately limit output current but there are remarkably few solutions that can do both with a single ic system designers must typically trade off accuracy in. In order to ensure the leds function perfectly the self contained led driver needs to provide a constant power supply for the led. Constant voltage drivers switch this alternating current voltage vac to a low direct current voltage vdc. A constant voltage power supply receives standard line voltage 120 277vac.

The power source is monitoring the arc and making millisecond changes in order to maintain a stable arc condition.

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