Bench Power Supplies

Bench Power Supply FAQ

When should you use a bench power supply?

A bench power supply is a tool that converts alternating current (AC) to direct current (DC). It is typically used to test equipment on lab benches. Engineers frequently use benchtop DC power supplies to design, test, and debug electronic devices.

Where is a DC power supply needed?

A DC power supply provides a constant biasing voltage or current to electrical devices, components, or circuits. It ensures that the device-under-test (DUT) operates as expected. For example, a DC power supply is used by engineers to test IoT devices, medical products, mobile phones, remote industrial sensors, and other electronic devices.

How do you use a DC power source?

A programmable DC power source connects to a DUT via leads that connect to the DC power supply panel. Engineers can set voltages or current levels to power the device for testing purposes.

What is an autoranging power supply?

An autoranging power supply provides continuous ranging and offers higher current at more voltage settings. An autoranging power supply increases testing flexibility and enables you to use only one power supply to create voltage and current combinations.

What is overvoltage and overcurrent device protection?

Overvoltage provides protection when the power supply exceeds the preset voltage limit. When the power supply’s output exceeds the preset voltage limit, the output will disable and an overvoltage indicator will appear.

When the current flowing through a power supply reaches the preset limit, it enters a constant current operating mode, which provides overcurrent protection. The voltage usually goes down in constant current mode, and the current remains at the current limit setting. If overcurrent protection is enabled, it shuts down the output to prevent too much current from flowing out. Typically, overcurrent protection is off by default, and it is off when shipped from the factory. Use the overcurrent protection feature to safeguard your setup.

Why do you need a power supply with power sequencing?

If you are working with devices that have specific timing requirements, use a power supply with power sequencing. Power supply sequencing enables you to automatically set voltage outputs and delays according to a scripted pattern. You can avoid accidental damage by using power supply sequencing, which means you no longer need to manually turn on different channels or set output voltages.

What is peak power?

Peak power is the amount of power a power supply can push out over a brief period to support the surge energy needed to start a DUT without disrupting the output voltage. One solution is to use a power supply that continuously delivers peak demand. You can also use a smaller benchtop power supply to provide peak power demands for short periods without compromising reliability.

Why use a power supply with peak power capability?

A power supply with a peak power capability can handle load spikes and prevent those spikes from damaging the power supply. Most circuits, especially those with electromechanical components, require start-up currents higher than the steady current the equipment draws when operating normally. The initial current may be between two and three times the normal current, lasting milliseconds or a few seconds. The power supply needs to handle such spikes and others that may occur without interrupting the operation or the function of the load.