Less space and faster validation, more powerful testing capability, verifying more devices at one time. Testing and validation have the same envision either for R+D in laboratory or for production end-of-line and the most foundational expectation that lies behind is to achieve better productivity within a certain given area.

A conventional testing scenario may involve the implementation and deployment of a programmable power supply to drive electronic testing from a single AC input, then with the addition of an electronic load to connect the DUT’s output side, further accompanied by measurement instruments to build up a complete testing topology. Nevertheless, such an approach multiplies the complexity and gets the testing cost rocketed once when there are multiple sets of electronic devices engaged in the testing.

This article will clarify the features of multi-channel power supplies and further extend the topics to the latest new innovations of modular testing system that offers more advanced multi-channel testing applications.

What are Multi-Channel Power Supply

Multi-channel power supply refers to a certain design of programmable and testing-purposed power supply that converters a single AC input and splits it into multiple channels whose output parameters such as voltage, current and power are separately and independently adjustable and controllable.  Multi-channel power supplies are, in themselves, available for series or parallel connection between the channels to offer more flexibility of testing application.

Traditional Multi-Channel Testing Application

The primary advantages of multi-channel power supplies is achieving better space utilization and power density when it is applied for automated test equipment (ATE) racks where a ranges of devices are integrated to operate simultaneously for satisfying the device under test (DUT). In case of testing application where multiple voltage or power levels are required in sequential process steps,  multi-channel power supplies outstrip the others.

Being their primary advantage of space-saving, and depending on certain testing applications, multi-channel power supply may provide all the power outputs channels to a single unit under test thus to replace 3 sets of power source or to test 3 sets of devices simultaneously without the essentialness of connecting each one of them with a power supply.

Applications: Simultaneous Testing of Multiple Battery Cells

Supposing a testing scenario where several battery cells are to be validated under controlled charge and discharge conditions, with each of them powered and monitored independently for verifying capability, cycle life and consistency across a batch.

The conventional approach would be sourcing each battery cell with a separate DC power source. However, using single-channel supplies for each cell quickly becomes impractical, as the number of instruments, wiring complexity, and data synchronization challenges increase.

A multi-channel test power supply solves this problem by integrating multiple programmable outputs within a single unit. Each channel can act as an independent source or sink, providing precise voltage and current control, while also recording performance data in parallel. This allows engineers to subject dozens of cells to identical or varied test profiles simultaneously, streamlining the evaluation process and improving statistical reliability. With synchronized operation, transient events and fault conditions can also be reproduced consistently across all channels, enabling faster validation of battery technologies for electric vehicles, energy storage, and portable electronics.

Applications: Server CPU & GPU Testing With Multiple Inputs

Validating CPUs and GPUs for data center applications requires precise control of multiple voltage domains and the ability to reproduce dynamic load conditions. Modern processors demand a 12 V high-current rail for core operation, alongside auxiliary rails such as 5 V for peripherals and lower rails like 1.8 V or 1.2 V for memory controllers and high-speed logic. Each rail must follow a strict power-up and sequencing profile to prevent latch-up or initialization failures.

A multi-channel test power supply enables engineers to program these rails simultaneously with independent voltage, current, and timing parameters, while central coordination ensures deterministic sequencing. In addition, advanced transient testing can be performed by introducing fast load steps to simulate sudden workload shifts, capturing voltage droop, recovery time, and overshoot behaviour with oscilloscope probes. This allows engineers to characterize the power integrity of CPUs and GPUs under conditions that closely mirror data center operation, ensuring stable performance and compliance with design specifications.

Modular and Slot-Based Multi-Channel Power Supply: More Advanced and Flexible Options

Traditional multi-channel power supplies have been acknowledged for their advantages of saving space and simplifying testing complexity though, they have certain limitations when the testing scenarios require further advanced features, for example, like bidirectional power flow and simultaneous AC and DC outputs or inputs. Some of these requirements would further complicate the wiring with more instruments needed for building up the test bench, or that they are in nature unachievable with the traditional multi-channel power supply.

The latest advancement and innovations with multi-channel power supplies strive to achieve more functionality and achieve to develop more powerful testing equipment. Some of the innovations are:

• Achieving both source and load with each channel: Most of the multi-channel power supplies are only capable of operating at the 1st quadrant of I-V Cartesian system and are in nature purely power sources and cannot sink power or serve as a programmable electronic load like a typical bidirectional power supply. The testing application where two-way power flow is needed would also call for a programmable electronic load, apart from the multi-channel power supply.
• Supporting both AC and DC from each channel: Most multi-channel supplies are DC. That’s because most DUTs need multiple low-voltage DC rails, while implementing many independent AC channels is expensive and bulky: each channel is effectively its own inverter with amplitude/frequency/phase/harmonic control, isolation and EMC constraints, hurting power density and cost.
• Make channels configurable slots instead of not fixed outputs: Traditional multi-channel supplies lock you into a fixed number and rating of outputs. A modular, slot-based design turns each “channel” into a plug-in module, DC, AC, or bidirectional, so the user can swap, mix, and scale channels as the testing applications evolve.

Introducing “Helion” Multi-Channel Modular Power Supply

“Helion” modular multi-channel power supply advances further beyond those conventional ones which are merely a certain form of source. “Hellion” offers a range of modules including bidirectional DC module, AC module, and PV simulation module which can be combined through 6 slots within the mainframe to build up testing topologies for different scenarios and applications.

-  Fast Changeover Modules
Fast-removal and swap modules in minutes with auto-identification and instant channel remapping.

- Versatile Module Options
Mix DC, bidirectional/regenerative, and AC source modules to match evolving tests.

- 6-Slots of Flexible Combination
Six universal slots let you scale voltage/current and function, slot by slot. 

- Build-Up Your Testing Topology
Design your own test topology: multi-rail DC benches, AC+DC mixed rigs, or synchronized multi-channel profiles.