Development History of Power Supply Burn-In Test Equipment

Burn-in testing has become a critical step in power supply manufacturing, mainly to verify and improve the reliability, stability, and safety of power products.Burn-in / Aging Test refers to simulating harsh high-temperature environments and conducting long‑term full‑load testing to replicate real‑world extreme conditions and evaluate product performance.

First Generation: Resistive Load Burn-In Equipment

Traditional burn-in equipment mainly used high-power resistors as dummy loads.

Advantages: Low cost, simple structure.

Disadvantages became increasingly obvious with diversified power products:

Fixed resistance with limited specifications; many required custom orders.

Could not precisely match the required current for different power models.

Large resistance error; drift easily occurred after heating, making 100% load testing unreliable.

Load adjustment required manual calculation; only approximate current could be achieved.

No automatic monitoring; relied on manual inspection with low efficiency and missed defects.

No parameter recording, making quality traceability impossible.

Could not generate test reports, hindering quality analysis.

Second Generation: Simple Adjustable Electronic Loads

To overcome the limitations of resistive loads, simple adjustable electronic loads emerged.

Advantages:Allowed load current adjustment according to product specifications, eliminating frequent resistor changes and improving accuracy and efficiency.

Limitations:Still could not solve the last four drawbacks of the first generation.Although standard benchtop electronic loads offered sufficient performance, they were expensive, bulky, designed for R&D and laboratory use, and difficult to network in hundreds of channels for mass production burn-in.

Third Generation: Intelligent Electronic Load Burn-In Systems

Optimized by combining the advantages of standard electronic loads and previous generations, specifically designed for power supply burn-in.Built around high-performance MCUs as the core control unit, forming modular intelligent electronic loads and centralized management systems.

Main Advantages:

Support CC / CV / LED modes in one module, compatible with multiple power types.

Voltage and current freely settable within range for precise matching.

Flexible and fast parameter configuration: global, zoned, or layered settings.

Real-time parameter monitoring, automatic abnormal alarm and precise fault location.

Wide load range and high precision, adaptable to various power specifications.

Full electrical performance data recording and traceability for quality analysis.

PC-based centralized monitoring and process control.

Automatic report generation for engineering evaluation.

Easy operation; one operator can manage multiple burn-in areas.

Modular design for convenient maintenance.

With continuous improvement, advanced models such as Cosail Electronics’ CP8102 full-mode burn-in module feature:wide input range, high bandwidth, high precision, 4 isolated channels,and full modes including CC / CV / CR / CP / LED,specially optimized for LED drivers to greatly improve compatibility and reliability.

Energy-Regenerative Burn-In Solutions

In addition to conventional dissipative electronic loads, energy-regenerative burn-in systems have also been developed.

Core Advantage: High energy efficiency and environmental protection; significantly reduces electricity costs.

Current Limitations:Typically only support CC / CV modes with narrow input voltage ranges.Mainly suitable for medium-to-high power adapters, industrial power supplies, telecom power supplies, high-power chargers, and streetlamp power supplies.Not fully compatible with most LED drivers on the market for several reasons:

LED drivers are usually low-cost constant-current sources with large output ripple. Insufficient load bandwidth or response easily causes oscillation, inaccurate output, or even damage.

LED drivers have strict protection characteristics. Non-LED-mode loads often fail to start normally or cause overshoot damage.

Slow response may trigger OVP (overvoltage protection) frequently.

Dissipative loads with dedicated LED mode perform much better in these aspects.With technological progress, these limitations of regenerative loads will gradually be resolved.