Your Leading AC/DC,AC/AC Power Supply Manufacturer in China

  • High-quality components and rigorous testing ensure reliable performance
  • Compliant with international safety and quality standards
  • Competitive pricing and volume discounts
  • Quick lead times and reliable delivery
  • Tailored solutions for your specific needs
  • Comprehensive pre-sales and after-sales support
  • 24 Months Warranty Time On All Power Supplies
  • Free consultation to help you find the best solutions for your needs

Choose Top Quality Power Supplies for Enhanced Electronic Performance

About Longjann Tech: Your Best Power Supply Factory and Supplier

One of the Best Power Supply Manufacturer And Supplier in China

Founded in 2004, Longjann Tech Co., Ltd specializes in manufacturing Switching Power Supplies, Power Adapters, AC Adapters, Battery Chargers, high/low frequency transformers, and related products. Our range serves diverse industries including portable consumer electronics, IT communication equipment, digital devices, and power tools.

With UL/CUL/TUV/GS/CE/CB/SAA/PSE/CC safety certifications and a robust customer service system, our products have earned praise worldwide. We prioritize OEM opportunities and offer a minimum 2 years warranty on all products, backed by comprehensive after-sales service for our wholesale clients.

switching power supply pcb

Why LongjannTech Can Be Your Reliable Power Supply Supplier?

20 Years Power Supply Manufacturing Experience

Rich experience in Power Supply manufacturing

100% Burn-in Test

All Power Supplies undergo a Burn-in Test before shipment to ensure reliability and performance.

24/7 Online Support

We offer 24/7 online support to assist with all your Power Supply needs.

Compliance and Certifications

Our Power Supplies comply with international safety and quality standards


We offer customized power supply solutions to meet specific customer needs.

Fast Delivery Time

We ensure timely delivery to meet your deadlines and keep operations running smoothly.

Welcome To Visit Our Booth At Exhibition and Fair

power supply for security

CPSE 2023 The 19th China Public Security EXPO

Booth NO: 7A08
Address: Shenzhen World Exhibition & Convention Center(No.1 Zhancheng Rd, Fuhai Street, Bao’an District, Shenzhen)
Time: October 25th-28th, 2023

China Hi-Tech Fair power supply manufacturer list

China Hi-Tech Fair 2023

Booth NO: 2A66
Address: Shenzhen World Exhibition & Convention Center(No.1 Zhancheng Rd, Fuhai Street, Bao’an District, Shenzhen)
Time: November 15-19, 2023

    Where Our Power Supplies Are Most Sold

    LongjannTech Power Supply Key Features

    • High Efficiency: Our power supplies are designed to maximize energy efficiency
    • Short Circuit Protection: All power supplies are designed with short circuit protection
    • Overload Protection: All power supplies are Built-in overload protection
    • EMI/RFI Suppression: Our designs include effective EMI/RFI suppression to minimize electromagnetic interference
    • Robust Design: Our power supplies feature durable and compact designs, suitable for a wide range of applications
    • Expert Support: Experienced engineers provides expert technical support and after-sales service to ensure customer satisfaction.

    Warmly Welcome To Visit LongjannTech Factory Anytime

    The Resource to Help You Become Expert of Import Power Supplies

    Contact LongjannTech today to start your seamless Cooperation