Introduction to UL 2738 Testing Standards for Wireless Chargers
As an emerging high-tech charging solution, wireless charging has garnered significant attention in recent years. Its superior user experience and the convenience of eliminating cables have made it increasingly popular among consumers. However, product quality and safety remain critical concerns for both consumers and manufacturers. UL 2738 is the key testing standard for wireless charging products. This article outlines the standard from three perspectives: component analysis, testing items, and standard requirements.
I. Product Component Analysis
A wireless charging product primarily consists of two parts: the wireless charger (transmitter) and the charging device (receiver). The wireless charger can be broadly divided into a power transmitter and a transmission coil array, while the charging device comprises a receiver coil array and a receiving power supply.
The power transmitter in the wireless charger mainly functions as a regulated power supply, providing stable voltage to the transmission coil array to prevent fluctuations that could affect charging efficiency. The transmission array is composed of multiple coils that generate an electromagnetic field to transfer energy via the principle of electromagnetic induction. Similarly, the receiver array consists of multiple coils designed to capture the electromagnetic field from the transmitter and convert it into electrical energy. The receiving power supply acts as a DC power source, delivering current to the receiver circuitry.
II. Testing Items
The UL 2738 standard covers a comprehensive range of testing items for wireless charging products, including but not limited to:
III. Standard Requirements
UL 2738 is a mandatory testing standard for wireless charging products. It requires that products demonstrate compliance in terms of stability, service life, electrical safety, electromagnetic compatibility (EMC), failure mode analysis, durability, and appearance.
Electrical safety is a critical requirement. UL 2738 stipulates that both the charger and the charging device must incorporate protective measures against fire, water, shock, and electric leakage, with safety ratings conforming to the standard.
Furthermore, electromagnetic compatibility is a key focus area. The standard requires wireless chargers and devices to pass multiple tests, including radio frequency emission assessments, IEC testing, CDN (Coupling/Decoupling Network) testing, ESD (Electrostatic Discharge) testing, and electrostatic discharge immunity tests.
About GTS
Global United Technology Services Co., Ltd. (GTS) holds internationally recognized CNAS (L5775) laboratory accreditation, U.S. FCC NVLAP qualification, and domestic CMA inspection and testing certification. We are authorized to issue test reports that are mutually recognized internationally. Additionally, we hold accreditations from leading institutions such as the UK’s ITS, Germany’s TÜV, and Belgium’s Eurofins.
We specialize in core testing fields including EMC, electrical safety, wireless RF, and chemical testing for export compliance. GTS provides a one-stop service encompassing "testing, rectification, and technical training," making us your ideal partner for global market access.
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