BiPolar Power Supplies

 

BiPolar power supplies (four-quadrant) can source and sink current across both positive and negative voltage ranges. They're ideal for testing devices like motors, amplifiers, and batteries that operate in both directions.

Our collection includes new and used models from trusted manufacturers. Each unit supports precise control and flexible output settings for a range of testing needs.

Browse ValueTronic’s available inventory to compare specs, request a quote, or find the right fit for your lab or project.

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Frequently Asked Questions

What is a bipolar (four-quadrant) power supply?
A bipolar power supply, also called a four-quadrant power supply, can provide both positive and negative voltage and current. This means it can operate in all four quadrants of the voltage-current graph, sourcing and sinking current in both polarities. It’s commonly used to test components that may alternate between consuming and returning energy, such as actuators, transducers, and batteries.
How is a bipolar power supply different from a unipolar power supply?
A unipolar power supply outputs voltage and current in only one direction, usually positive. In contrast, a bipolar power supply delivers both positive and negative voltage and can either source or sink current. This makes it more versatile for applications that involve bidirectional current flow or voltage swings, such as testing reversible systems or simulating dynamic operating conditions.
Why would I need a bipolar power supply?
You would need a bipolar power supply when your test setup involves devices that operate in both directions. This includes components that generate and absorb energy, such as electric motors, battery systems, and certain types of amplifiers. A bipolar supply makes it possible to simulate real-world conditions, apply negative voltage, and safely sink current without external circuitry or manual switching.
What are the common applications of bipolar power supplies?
Bipolar power supplies are commonly used in test environments where both positive and negative voltages are required. Applications include driving and testing motors, simulating battery charging and discharging, characterizing amplifiers, and supporting power electronics development. They are also used in semiconductor testing, magnetic component evaluation, and research labs where precise bidirectional control of current and voltage is needed.
How do I choose the right bipolar power supply for my needs?
Start by identifying the voltage and current levels your application requires, then consider how the supply needs to respond during operation. Some use cases call for fast transitions and fine resolution, while others prioritize stability or low noise. Features like programmable control, remote interface options, and current-sinking capacity may also be important. Comparing technical specifications across models will help narrow your selection based on performance and compatibility.
What specifications should I look for in a bipolar power supply?
Key specifications include output voltage range, current range, bandwidth, slew rate, and common-mode rejection. The voltage and current ratings should match the requirements of your device under test. Slew rate affects how quickly the supply can respond to changes, which matters in fast-switching applications. Bandwidth is important for applications involving high-frequency signals. You may also want to evaluate resolution, accuracy, and available control interfaces based on how the supply will be used in your setup.