DIN Rail PSU
120W / 24V 5A
TS35 Mount
PLC Cabinet
Factory Engineered Units
High-Reliability Industrial Power Platforms
Explore field-proven switching platforms, DIN rail power supplies, and high-voltage DC converters manufactured in our Yueqing production facility. Custom OEM/ODM multi-channel and quad-output configurations are engineered to client exact specifications.
High Precision
1000W / 24V 41.7A
Adjustable V/A
Laser & Lab
Fuente De Alimentacion Variable 1000W AC DC 24V 41.7A Adjustable Power Source for Laser Lab Use
High Voltage
3000W / 110V 27.3A
Active SMPS
Heavy Industrial
3000W High Voltage DC Power Supply 110V 27.3A Adjustable SMPS 220V AC to 110V DC Converter for Industrial Use
IP67 Waterproof
60W / 24V 2.5A
IP67 Sealed
Constant Voltage
LPV-60-24 60W 24V 2.5A IP67 Waterproof LED Driver Constant Voltage AC DC Switching Power Supply Outdoor Lighting
Active PFC
240W / 24V 10A
Active PFC >0.95
94% Efficiency
LEYU EDR-240-24 DIN Rail Power Supply 24V 10A 240W AC DC Single Output Active PFC Industrial Automation
Wide Input
100W Universal
85-264VAC In
Enclosed Metal
100W Industrial AC/DC Switching Power Supply Wide Voltage Input Single Outputs 60Hz 50Hz Frequency
Ultra Slim
240W / 24V 10A
95% Peak Eff.
Slim Form Factor
EDR-240-24 Industrial DIN Rail Power Supply 24V 10A 240W Single Output AC-DC Switching Converter Slim Design 95% Efficiency for
Compact Series
30W / 24V 1.5A
Low-Loss Standby
Class II Safe
30W Industrial DIN Rail Power Supply 24V 1.5A AC DC Converter for PLC Control Cabinet & Building Automation
Engineering Whitepaper
Deep-Dive Architecture: Quad Output Power Supply Design & Multi-Rail Isolation
Comprehensive engineering analysis of multi-rail switching topologies, galvanic boundary management, cross-regulation compensation, and post-regulation topologies for modern electronic systems.
In modern industrial automation, robotics, telecommunications, and diagnostic medical instruments, electronic systems rarely function on a single voltage bus. A contemporary automated testing cabinet or robotic controller typically necessitates +24V DC for high-torque servo drives and electromechanical actuators, +12V DC for peripheral interface logic and cooling fans, +5V DC for central microcontroller logic, and -12V or +3.3V DC for low-noise analog measurement circuitry, operational amplifiers, and precision digital signal processors (DSPs). Historically, system integrators utilized multiple independent single-output power supplies connected in parallel on a DIN rail or rack chassis. However, this discrete approach inevitably introduces high overall bill-of-materials (BOM) overhead, voluminous footprint penalties, unpredictable ground-loop interference, and severe thermal dissipation hotspots.
The transition toward an integrated Quad Output Power Supply—engineered via dedicated OEM/ODM manufacturing partnerships—solves these physical and electrical bottlenecks by combining four synchronized rails into a singular, highly efficient AC-DC converter enclosure. Nevertheless, implementing multiple independent or common-ground outputs from a unified primary switching stage presents stringent magnetic and feedback complexities, predominantly centering around cross-regulation drift, inter-channel leakage inductance, and differential loop stability.
Coupled-Inductor Topology
Traditional multi-winding flyback converters suffer from cross-regulation errors exceeding ±12% when secondary rails experience wide load step variations. Our custom engineering incorporates tightly coupled planar magnetic cores and bifilar windings to minimize parasitic leakage inductance between V1, V2, V3, and V4.
- Dynamic cross-regulation contained within ±3.0%
- Leakage flux reduction using interleaved split windings
- Magnetic integration optimizing thermal equilibrium across rails
Synchronous DC-DC Post-Regulation
For applications demanding independent tight regulation (≤ ±1.0%) across all 4 rails regardless of cross-loading imbalances, our OEM architectures deploy an isolated high-efficiency primary stage (LLC resonant or active clamp forward) followed by dedicated synchronous buck/boost POL regulators.
- Eliminates minimum load restrictions on subsidiary rails
- Ultra-low ripple & noise down to < 30mVp-p
- Individual current limiting and short-circuit foldback protection
Galvanic Isolation & Creepage Control
Meeting medical (IEC 60601-1 2xMOPP) and industrial (IEC 62368-1) reinforced isolation standards necessitates rigorous physical trace separation. We engineer multi-output transformers with triple-insulated winding wire (TIW) and optical feedback isolation ratings exceeding 4000VAC.
- Reinforced primary-to-secondary dielectric withstand up to 4.2kVAC
- Secondary-to-secondary ground separation up to 500VDC
- Optimized PCB slot routing achieving > 8.0mm creepage clearance
| Architecture Typology | Primary Topology | V1 (Main) Regulation | V2/V3/V4 Cross Regulation | Minimum Load Requirement | Recommended OEM System Application |
|---|---|---|---|---|---|
| Multi-Winding Flyback (Cost Optimized) | Quasi-Resonant Flyback | ± 1.0% (Opto Closed-Loop) | ± 5.0% to ± 10.0% | Yes (10% on V1 required) | Low-power consumer appliances, basic security systems, auxiliary supplies |
| Coupled-Inductor Forward Converter | Two-Switch Forward | ± 1.0% | ± 3.0% to ± 4.5% | Yes (5% dummy or preload) | Industrial machinery, motor control, legacy telecom line cards |
| Hybrid LLC + Synchronous DC-DC POL | Half-Bridge LLC Resonant | ± 0.5% (Digital Loop) | ± 1.0% (Independent POL) | Zero Load (0W minimum) | Medical diagnostics, high-end test instrumentation, 5G base stations, robotics |
| Active Clamp Forward with MagAmp | Active Clamp Forward | ± 1.0% | ± 1.5% to ± 2.5% | Minimal (< 2%) | Severe EMI environments, defense communication, airborne telemetry |
Critical Design Imperative: Solving the "No-Load Cross-Regulation Collapse"
In conventional multi-output SMPS platforms, when the master rail (typically V1, +5V or +24V) is lightly loaded while an auxiliary rail (such as V2 or V3 powering an analog sensor or cooling fan) encounters sudden peak demand, the duty cycle driven by the primary PWM controller narrows drastically. This consequence leads to an abrupt voltage collapse or severe under-voltage lockout on the loaded secondary rail. Our custom OEM engineering circumvents this systemic limitation through Weighted Secondary Feedback Networks, Dynamic Bleeder Switching Circuits, or Independent Secondary Post-Regulators, guaranteeing unconditional stability even under 0% to 100% cross-load imbalances.
Strategic Sourcing Insights
Future Procurement Trends in Multi-Output Power Conversion (2025–2030)
Actionable intelligence for technical purchasing agents, OEM engineering heads, and supply chain managers navigating changing efficiency standards, component shortages, and technological disruptions.
Wide-Bandgap (GaN/SiC) Adoption
Procurement teams are shifting away from legacy Silicon MOSFET designs toward Gallium Nitride (GaN) and Silicon Carbide (SiC) topologies. High switching frequencies (300kHz–1MHz) drastically shrink the physical volumetric size of planar transformers and output choke filter capacitors.
- Power density gains from 12W/in³ up to 30W/in³
- Up to 96% full-load efficiency reducing heatsink requirements
- Enables 1U rack-mount and low-profile ultra-compact quad designs
PMBus & Digital Telemetry Demands
Hardware procurement is converging with Industrial IoT. Modern tenders require quad-output power supplies equipped with PMBus™, I2C, or CANopen interfaces. Systems require real-time reporting of per-rail voltage, temperature, load current, and predicted operational lifespan.
- Real-time telemetry supporting predictive maintenance
- Programmable per-rail power sequencing and soft-start timing
- Dynamic output voltage trimming via digital commands
Modular Customization vs. Full-Custom NRE
To mitigate the traditional 6 to 12-month development cycle and substantial Non-Recurring Engineering (NRE) fees of ground-up custom designs, tier-1 procurement managers are selecting Configurable Multi-Rail Modular Platforms that allow rapid swapping of pre-certified output modules.
- Prototype delivery turnaround compressed from months to 2 weeks
- Pre-certified base chassis easing CE, UL, and CB field compliance
- Flexible scaling for small-batch high-mix production runs
Geopolitical Supply Chain Diversification & Onsite Auditing: As supply chain vulnerabilities continue to challenge international original equipment manufacturers, procurement protocols have permanently changed. Enterprise buyers now mandate proof of factory-direct ownership, vertically integrated manufacturing capabilities (such as in-house SMT, automatic optical inspection, and automated burn-in screening), and verifiable third-party certification checks. Sourcing directly from verified Chinese manufacturers located within high-density electrical manufacturing ecosystems (such as Yueqing, Zhejiang) provides multinational enterprises with significant cost efficiencies, direct access to senior design engineering teams, and resilient production bandwidth.
Manufacturing Authority
Why Tier-1 Global Buyers Partner with Yueqing Keldan Technology
Backed by over 18 years of specialized power electronics engineering, our Yueqing manufacturing campus combines cutting-edge production lines, rigorous QA/QC inspection regimes, and complete OEM/ODM customization services.
TÜV Verified Onsite
Audit-Ready Facility
Our production facilities, testing capabilities, and trade compliance have undergone rigorous onsite inspection by TÜV Rheinland. Full inspection reports and credit ratings are transparently open for buyer verification.
18+ Years Heritage
China Electrical Capital
Operating from Beibaixiang, Yueqing—the epicentre of China's electrical equipment industry—gives us direct access to world-class supply chains for magnetic cores, power semiconductors, and precision metal tooling.
In-House SMT & AOI
Strict Quality Control
Our workshop houses high-speed automated SMT mounters, computerized reflow soldering tunnels, Automated Optical Inspection (AOI) stations, and component lead trimming equipment to prevent manufacturing anomalies.
100% Load Testing
Elevated Temp Burn-In
Zero-defect deployment is guaranteed via 100% high-temperature full-load aging racks. Every single power supply undergoes dynamic thermal stress and functional calibration before packaging and pallet release.
Dedicated OEM/ODM R&D Team
Supported by senior SMPS engineers with over 5 years of individual field expertise. We specialize in custom multi-channel voltage combinations (e.g., +24V/+12V/+5V/-12V), specialized chassis forms, custom DIN rail brackets, and private labeling.
Multilingual Export Capability
Our 12-person international trade department provides responsive, technically literate support across multiple time zones. We manage seamless customs clearance, complete DDP/FOB documentation, and comprehensive packaging compliance.
Flexible Minimum Orders (MOQs)
We empower rapid industrial prototyping and small-batch equipment deployments by offering low prototype MOQs starting from 1 unit for standard catalog platforms, coupled with rapid engineering turnaround for custom sample builds.
Procurement Due Diligence
Frequently Asked Questions: Multi-Output & Quad SMPS Sourcing
Detailed technical, regulatory, and commercial answers addressing common inquiries from system architects, electrical engineers, and international procurement managers.
What defines a true Quad Output Power Supply versus four single-output modules?
A dedicated quad-output power supply consolidates four regulated DC output rails inside a single enclosure utilizing a synchronized primary stage (active PFC and power conversion stage). Compared to deploying four discrete single-output units, a unified quad-output SMPS offers up to a 45% reduction in cabinet space, lower overall installation labor, synchronized EMI characteristics (preventing harmonic beat frequencies between asynchronous oscillators), shared thermal management, and lower overall system acquisition cost.
How does your factory prevent cross-regulation degradation on secondary rails?
We employ three proprietary design approaches based on customer accuracy requirements: First, custom planar transformers with bifilar or interleaved secondary windings to minimize leakage inductance; second, weighted optical feedback sensing loops that sample both the primary high-current rail (e.g., +24V) and secondary logic rails (e.g., +5V); third, for zero-load applications demanding independent ±1% regulation, we integrate isolated primary LLC stages coupled with independent synchronous DC-DC Point-of-Load (POL) post-regulators for channels 2, 3, and 4.
Are the outputs galvanically isolated from each other or share a common ground?
We engineer both architectures depending on your schematic topology: Common Ground configurations are standard for general automation and embedded computing where all four rails share an internal 0V reference. Fully Galvanically Isolated configurations feature separate secondary windings, isolated optical feedback, and separate return terminals (e.g., 500VDC or 1.5kVAC isolation between channels), which are essential for isolating noisy motor drives from sensitive analog instrumentation or communication buses.
What OEM/ODM customization parameters can Yueqing Keldan Technology accommodate?
Our engineering team supports full hardware and mechanical customization, including: tailored voltage combinations (e.g., non-standard +28V, -48V, +15V, +3.3V), continuous and peak surge current capabilities, mechanical enclosures (TS35 DIN rail mount, ultra-thin 1U enclosed metal chassis, open-frame PCB, or IP67 sealed), terminal blocks (screw, spring-cage, or detachable terminal plugs), conformal coating for harsh chemical/high-humidity environments, private silkscreen branding, and specialized EMC filtering for EN 55032 Class B compliance.
What quality screening and burn-in procedures are executed before dispatch?
Every manufactured unit traverses an 8-stage quality assurance process: 1) Incoming raw component inspection (IQC) testing capacitors, MOSFETs, and magnetic cores; 2) SMT pick-and-place with reflow profile monitoring; 3) Automated Optical Inspection (AOI) checking for micro-bridging or tombstoning; 4) Manual precision through-hole assembly; 5) In-circuit debugging and initial voltage calibration; 6) 100% full-load dynamic burn-in testing inside heated aging chambers to eliminate infant mortality; 7) Final high-voltage dielectric withstand (Hi-Pot) and ground continuity testing; and 8) Final cosmetic, functional, and barcoded packaging inspection before dispatch release.
How do you handle international regulatory certifications (CE, RoHS, UL, CB)?
Our standard production power supply series carry CE and RoHS compliance marks. Test reports covering Low Voltage Directive (LVD EN 62368-1) and Electromagnetic Compatibility (EMC EN 55032, EN 61000-3-2 Active PFC) are readily supplied to purchasing teams upon request. For custom OEM/ODM multi-output projects requiring dedicated UL, CB, or medical IEC 60601-1 certifications, our engineering team manages the complete pre-compliance design layout and interfaces directly with accredited third-party test laboratories.
