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Charger-PSE-Certification-Application-Process-and-Testing-Requirements
Chargers sold in Japan must comply with PSE (Product Safety of Electrical Appliance & Materials) certification requirements. This guide covers the PSE certification pathway for chargers, including applicable standards, testing scope, and key compliance steps.
PSE Certification Classification for Chargers
Japan's Electrical Appliance and Material Safety Law (DENAN) divides regulated products into two categories:
- Specified Electrical Appliances (Diamond PSE mark):High-risk products requiring third-party certification by a registered conformity assessment body (RCAB). AC adapters and chargers rated above 100V input fall into this category in certain configurations
- Non-Specified Electrical Appliances (Round PSE mark):Lower-risk products where self-declaration is permitted. Many USB chargers (5V output) fall into this category
The classification depends on the product's voltage rating and application. USB chargers with 5V output for general consumer use typically require round PSE, while AC-powered charging devices may require diamond PSE.
Applicable Standards and Testing Requirements
Charger PSE certification follows the Japanese J standards, which are largely harmonized with IEC standards:
J62368-1 Safety of audio/video, information and communication technology equipment (harmonized with IEC 62368-1)
J55032 EMI emission requirements for multimedia equipment
J55035 EMC immunity requirements for multimedia equipment
Key safety testing items include:
- Dielectric strength test — primary to secondary insulation
- Temperature test — at 100V AC (Japan's nominal voltage) and 115V AC (overvoltage condition)
- Abnormal operation test — output short circuit, overload, component failure
- Mechanical strength test — impact and drop
- Flame retardancy — enclosure glow wire test
Practical Insight:During PSE certification for a 65W GaN charger, the temperature test at 100V AC input showed the transformer core reaching 118°C — within the 130°C limit for Class F insulation. However, Japan's voltage can fluctuate to 115V AC, and at this overvoltage condition the core temperature rose to 132°C, exceeding the limit. The solution was to optimize the transformer winding design to reduce core losses at the higher input voltage, bringing the temperature to 122°C at 115V AC.
PSE Certification Process
For chargers requiring diamond PSE (third-party certification):
- ①Select RCAB:Choose a Registered Conformity Assessment Body accredited by METI
- ②Submit application and documentation:Product specifications, circuit diagrams, BOM, PCB layout, labels
- ③Type testing:Send samples for safety and EMC testing per J standards
- ④Factory inspection:RCAB conducts initial factory inspection (for diamond PSE)
- ⑤Certificate issuance:RCAB issues the PSE certificate after successful testing and inspection
For round PSE (self-declaration), the manufacturer conducts testing at their own discretion and maintains test reports. GTG Group can assist with both diamond and round PSE certification processes for charger products.
Labeling and Market Surveillance
PSE marking requirements for chargers:
- Diamond PSE mark must include the RCAB identification number
- Round PSE mark with the manufacturer's name or registered trade name
- Product label must include: rated voltage (100V AC), rated frequency (50/60Hz), manufacturer information
- METI conducts market surveillance and can request test reports at any time
PSE certification timeline is approximately 6-10 weeks for diamond PSE and 4-6 weeks for round PSE.
This article is AI-assisted and for reference only. It does not constitute any certification commitment or legal advice. Please refer to the latest official regulations.
Contact: 13925591357 | net04@gtggroup.com