Custom Engineering Backed by 18+ Years of Power Electronics Expertise
At Yueqing Keldan Technology Co., Ltd., we combine dedicated R&D engineering with scalable production lines to meet the demanding requirements of global equipment manufacturers, automation panel builders, and energy system integrators.
Whether you require electrical modifications to existing DIN rail power supplies, new form-factor enclosures for embedded systems, or complete ground-up circuit development for DC-AC inverters, our senior engineering team delivers rapid prototyping, strict regulatory compliance, and consistent batch manufacturing.
What We Can Customize for Your Project
From component-level circuit adjustments to fully bespoke branding, we offer granular flexibility across electrical, physical, and packaging dimensions.
Electrical & Output Specs
Customizable input/output voltages, power ratings, multi-rail outputs, high-efficiency topologies, and specialized surge suppression.
- Output: 3.3V, 5V, 12V, 24V, 36V, 48V, up to 110V DC
- Power range: 15W up to 5000W
- Active PFC options (PF > 0.95)
- Custom current limiting & foldback profiles
Enclosure & Mechanics
Structural adaptations suited for control panels, harsh vibration machinery, space-restricted enclosures, and outdoor installations.
- Standard TS-35 DIN rail or panel chassis mounts
- Extruded aluminum, perforated mesh, or sheet steel
- Low-profile & ultra-slim mechanical layouts
- Conformal coating for moisture/dust resistance
Branding & Global Packaging
Complete private-label manufacturing including front panel artwork, laser marking, customized carton packs, and barcodes.
- Private-label nameplate & laser engraved logos
- Custom terminal layout and screw/cage connections
- Multi-lingual user manuals & packaging design
- Export-standard drop-tested master cartons
5-Stage Engineering & Delivery Workflow
A transparent and systematic progression from initial project scope to reliable serial delivery.
Requirements Definition
Review input/output voltages, power factor, thermal constraints, enclosure dimensions, and target certifications.
R&D & Prototyping
Schematic engineering, PCB layout design, thermal simulation, component selection, and prototype board assembly.
Validation & Debugging
Lab testing for line/load regulation, ripple noise, EMC compliance verification, and sample delivery for customer approval.
Pilot Run & Tooling
Trial batch assembly on dedicated automated SMT lines, pilot burn-in testing, and final quality parameter locking.
Mass Manufacturing
High-volume assembly, automated optical inspection, 100% full-load aging tests, and secure export logistics.
Real Workshop Production Lines & Equipment
Take an inside look at Yueqing Keldan Technology Co., Ltd. manufacturing assets: high-speed SMT placement, reflow soldering, automated optical inspection, assembly lines, and high-capacity aging testing systems.
SMT Mounter
High-speed surface-mount assembly ensures micro-component accuracy on multi-layer control boards.
Reflow Soldering
Multi-zone thermal profile control delivers void-free, durable solder joints on all power semiconductor leads.
AOI Automated Optical Inspection
High-resolution optical scanners verify solder bridge prevention, component orientation, and placement accuracy.
Aging Testing System
Centralized computerized testing racks to conduct continuous burn-in load verification on serial batches.
100% Aging Test
High-temperature burn-in cycles stress-test every power unit to eliminate early-life infant mortality defects.
High-Capacity Aging Racks
Continuous dynamic load testing simulating worst-case industrial ambient temperatures.
Debugging & Calibration
Engineers fine-tune voltage trimmers, check ripple noise with digital oscilloscopes, and verify overcurrent trips.
Assembly Line
Ergonomic workstations handling chassis fastening, heatsink compound application, and wire harness integration.
Precision Sub-Assembly
Trained assemblers fitting electrolytic capacitors, power chokes, transformers, and terminal blocks.
Welding & Soldering
IPC-compliant hand soldering for high-current copper lugs, heavy coils, and custom terminal brackets.
Cutting Pieces & Prep
Automated cutting, stripping, and tinning of leads for structural safety and clearance distances.
Production Process Phase 1
Sub-assembly staging and pre-soldering visual checks to maintain high yields at early assembly steps.
Production Process Phase 2
Intermediate electrical checkpoint verifying insulation resistance, high voltage breakdown (Hi-Pot), and ground continuity.
Main Production Floor
Organized, anti-static production area designed for agile batch transitions and high-efficiency workflow.
Dedicated Operator Lines
Station-by-station standard operating procedures (SOP) ensure repeatability across every production run.
Electronics Assembly Line
Clean, controlled production lines matching international customer safety and compliance requirements.
Lean Production Cells
Flexible manufacturing cells capable of small-batch OEM trials or steady high-volume container shipments.
Skilled Technical Staff
Experienced electrical workers with rigorous on-the-job training in power electronics assembly.
Finished Goods Staging
Completed switching power supplies and inverters awaiting final inspection and carton sealing.
Equipment Infrastructure
Continuous investment in modern automation machinery to maximize yield and eliminate manual variance.
Inventory & Material Management
Traceable component inventory system keeping first-tier magnetic cores, capacitors, and semiconductors organized.
Packaging & Warehouse
Clean, dry warehousing with anti-shock packaging materials for safe international sea and air transit.
Comprehensive Facility
Full manufacturing capacity located in Yueqing, Zhejiang — China's premier electrical manufacturing hub.
Engineering-Led Quality Control & Testing
Reliability in the field is guaranteed by stringent testing gates across the entire manufacturing lifecycle.
Incoming Material Verification (IQC)
Every batch of critical components—including high-frequency magnetic transformers, low-ESR electrolytic capacitors, and power MOSFETs—undergoes strict incoming inspection against approved datasheets before reaching the line.
100% Full-Load Burn-In Aging
Unlike factories sampling only a minor percentage, 100% of our switching power supplies and inverters undergo elevated-temperature dynamic full-load burn-in cycles to expose and filter out latent component defects.
Hi-Pot & Functional Inspection (OQC)
Before packing, every finished unit passes high-voltage dielectric withstand (Hi-Pot) insulation tests, ground bonding verification, and automated electrical output calibration with signed QA test reports.
Start Your OEM / ODM Project with Keldan Engineers
Send your custom specifications, design sketches, or target parameters. Our technical engineering team will review your application and respond with a detailed technical proposal and quotation.