399W 19V 21A Desktop Power Adapter Manufacturer | PFC AC DC Power Supply OEM Factory

The Guangdong QINX 19V 21A 399W desktop power adapter is developed to supply 399W of continuous output power while maintaining excellent voltage stability and conversion efficiency. Equipped with active PFC (Power Factor Correction) technology, the adapter improves power quality by increasing the input power factor, reducing harmonic distortion, and supporting compliance with international energy efficiency standards.

Engineered with an advanced switching power platform and high-grade industrial components, the adapter delivers tightly regulated 19V DC output, excellent load regulation, rapid transient response, and low ripple noise. The rugged desktop enclosure incorporates an optimized heat dissipation system that enables reliable full-load operation and enhances long-term product durability.

With its universal 100–240VAC input design, the adapter is suitable for worldwide applications without requiring input voltage adjustment. Guangdong QINX provides complete OEM and ODM customization services, including output cable specifications, connector types, cable lengths, housing finishes, product labels, logo printing, customized packaging, and private-brand manufacturing to satisfy diverse customer requirements.

Applications

• Industrial automation controllers
• AI inference hardware
• Industrial computing platforms
• Enterprise storage equipment
• High-speed communication gateways
• Smart factory monitoring systems
• Digital broadcasting infrastructure
• Industrial laser control equipment
• Electronic testing and measurement systems
• Commercial display processing units

Connector Options

Various output connector options are available, including:

• 5.5×2.1mm
• 5.5×2.5mm
• 6.5×4.4mm with center pin
• GX12, GX16, GX20, and GX25 aviation connectors
• 4-pin DIN connectors
• XT60, XT90, and XT90S connectors
• Anderson Powerpole connectors
• Molex Mini-Fit Jr. connectors
• JST connector series
• M8 and M12 locking circular connectors
• Waterproof threaded DC connectors
• Customized cable harnesses and dedicated connector solutions

Safety Design

Designed with multiple built-in protection mechanisms including over-voltage protection (OVP), over-current protection (OCP), overload protection (OLP), over-temperature protection (OTP), short-circuit protection (SCP), surge protection, and inrush current suppression to ensure dependable operation in demanding applications.

Certifications

Available with UL, cUL, CE, FCC, RoHS, UKCA, PSE, SAA, CB, and DOE Level VI certifications, meeting the compliance requirements of international OEM customers and export markets.