Bench Power Supplies

A bench power supply, also known as a laboratory power supply, is an essential piece of equipment for electronics enthusiasts, engineers, and researchers who need a reliable laboratory power supply for testing and powering circuits. These versatile tools provide adjustable voltage and current, making them ideal for a range of applications, from prototyping to troubleshooting electronic components.

A variable DC bench power supply allows precise control over voltage and current levels, helping to prevent damage to sensitive components by limiting current flow. This feature is particularly useful in situations where a short circuit could occur, as the power supply will automatically shut down, protecting your project.

When working with bench power supplies, it's important to consider four key electrical units: Current, voltage, power, and resistance. Ensuring that your laboratory power supply can provide adequate voltage while keeping up with the current drawn by your circuit is crucial for safe and efficient operation.

Difference Between Standard & Bench Power Supply

A bench power supply differs from standard DC power supplies in several key ways, primarily in its flexibility and precision. While standard power supplies typically provide a fixed voltage and current, bench power supplies offer greater control and adaptability, making them ideal for testing, experimentation, and troubleshooting in laboratories and workshops.

Here are the key distinctions that set a bench power supply apart:

• Adjustable voltage and current: Unlike fixed-output power supplies, bench power supplies allow users to fine-tune voltage and current settings to meet specific project requirements. This level of control is particularly useful for electronics testing, prototyping, and research applications where precise electrical inputs are essential.
• Multiple outputs: Many variable DC bench power supplies feature multiple output channels, enabling users to power more than one device simultaneously. This reduces the need for multiple power sources and enhances efficiency, especially in lab environments where space is limited.
• Real-time monitoring: Equipped with digital display screens, bench power supplies provide real-time feedback on output parameters such as voltage and current. This instant monitoring ensures accuracy and prevents potential issues during testing and experimentation.

Bench Power Supply Types

Bench power supplies are available in two main types:

Linear Power Supplies

Linear power supplies regulate voltage and current by converting AC power into DC and then stabilising the output through a series of transistors. Excess energy is dissipated as heat, which contributes to their larger size and heavier weight. Despite this, they remain a preferred choice for applications requiring highly stable and clean power delivery.

Advantages:

• Low electrical noise: Their design minimises electrical interference, making them ideal for precision applications such as audio, video, and analogue circuit testing.
• Stable and clean output: They provide consistent and reliable power, which is crucial for sensitive electronic components.

Disadvantages:

• Lower efficiency: A significant amount of power is lost as heat, making them less energy-efficient.
• Bulky and heavy: The need for large heat dissipation components and transformers increases their weight and footprint.

Switch-Mode Power Supplies

Switch-mode power supplies (SMPS) regulate power by converting AC into high-frequency pulses before smoothing it to achieve the desired voltage and current. This modern approach significantly improves energy efficiency while reducing weight and size.

Advantages:

• Higher efficiency: They convert a larger percentage of input power into usable output power, reducing energy waste.
• Compact and lightweight: Their efficient design allows for smaller and more portable power supplies, making them suitable for space-constrained environments.

Disadvantages:

• Increased electrical noise: The switching process generates electromagnetic interference (EMI), which can affect sensitive electronic applications.
• More complex design: Their internal circuitry is more intricate, which may result in higher maintenance and repair costs.

Key Features of Laboratory Power Supply

A laboratory power supply is designed for precision, flexibility, and reliability in electronic testing and experimentation. Key features include:

• Adjustable voltage and current: Allows users to fine-tune voltage and current levels for different testing requirements.
• Multiple output channels: Supports powering multiple devices simultaneously, increasing efficiency in lab environments.
• Digital display and monitoring: Provides real-time readings of voltage, current, and power to ensure accuracy.
• Overload and short circuit protection: Prevents damage to components and enhances safety.
• Low ripple and noise: Ensures stable power output, crucial for sensitive electronic circuits.
• Memory function: Saves frequently used settings for quick retrieval.
• Remote control capability: Enables integration with automated testing setups via software or external controllers.

Applications of Bench Power Supplies

A laboratory bench power supply is widely used in various industries and applications, including:

• Electronics Testing and Development: Used in R&D labs to power and test circuit designs, ensuring stable operation before mass production.
• Manufacturing and Quality Control: Essential for product testing and verification, ensuring electronic components meet industry standards before distribution.
• Education and Training: A bench power supply kit is often used in universities and technical schools to teach students about electrical engineering principles and practical applications.
• Automotive and Battery Testing: A DC bench power supply is ideal for testing vehicle electronics and battery charging systems, simulating different voltage conditions.
• Telecommunications and Networking: Provides stable power to routers, servers, and other networking equipment for research and repair purposes.
• Medical Device Testing: Supports medical electronics and biomedical research, ensuring safe and reliable operation of critical equipment.

How to Use a Variable Bench Power Supply

Using a variable DC bench power supply involves several key steps:

• Set the voltage and current: Adjust the voltage to match your circuit's requirements and set a current limit to prevent overloading.
• Connect the leads: Use the correct cables to connect the power supply to the device under test (DUT).
• Turn on the power supply: Activate the power and monitor the display for real-time voltage and current readings.
• Adjust as needed: Fine-tune the output using the control knobs or digital interface.
• Monitor the output: Check for fluctuations and ensure stable operation throughout the test.
• Turn off and disconnect: Power down the supply and safely disconnect the leads once testing is complete.

How to Choose the Suitable DC Bench Power Supply

When selecting a bench power supply, consider the following factors:

• Voltage and current range: Ensure the supply meets the required voltage and current levels for your application.
• Power output capacity: Higher wattage supports more demanding applications.
• Type of power supply: Choose between linear (low noise, stable output) or switch-mode (compact, efficient) models.
• Number of outputs: Multiple channels allow for simultaneous power to different devices.
• Safety features: Look for overvoltage, overcurrent, and short circuit protection to safeguard components.
• Display and interface: A clear digital display improves accuracy and usability.
• Brand and reliability: Opt for trusted brands known for durability and precision.

Trusted Laboratory Power Supply Manufacturer, Supplier & Distributor in Australia

RS is a leading supplier of bench power supplies in Australia, offering high-performance laboratory power solutions for electronics testing, manufacturing, and research applications. We stock power supply kits from top brands such as Keysight Technologies and RS PRO, ensuring quality and reliability. Whether you're looking for an affordable bench power supply or a high-end variable DC power supply, RS provides competitive bench power supply prices to suit all budgets.

Buy Bench Power Supply Kit Online from RS

Find high-quality bench power supplies for sale at RS Australia, with reliable nationwide delivery straight to your doorstep. Our fast shipping options ensure your order arrives within 2-5 business days in most locations. For more information on shipping and delivery, visit our Delivery Information page.