High Frequency Transformer
Ferrite core EE, EI, EF, PQ and RM designs for SMPS, chargers, LED drivers and inverters, plus coil inductors and chokes.
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Verified Custom Manufacturer
Custom Transformers & Power Supplies
OEM / ODM toroidal, low- and high-frequency transformers built to your specification.
Prototype to Volume
Ferrite Core & Flyback Transformers
Wound and tested around your circuit, not a catalog compromise.
Tested Before Shipment
SMPS & Power Adapters
Hi-pot, aging and load verified for stable field performance.
Full Customization
Design-based and sample-based builds: core, winding, bobbin, terminals and potting.
ODM Engineering
We develop the design from your electrical spec and application constraints.
Logo & Packaging
Minor customization of labels, logo printing and export packaging for your brand.
Finished Product Inspection
Electrical, dielectric and aging tests before every shipment leaves the factory.
Product Categories
Transformers & Power Supplies Built to Order
Custom Solutions, Dedicated Service All the Way
Low Frequency Transformer
50/60 Hz EI laminated, isolation and step-up / step-down transformers for control panels, instruments and appliances.
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Toroidal Transformer
Low stray field, low noise and compact toroids for audio amplifiers, lighting, medical and elevator control.
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Switching Power Supply
Enclosed, rainproof and LED driver SMPS with regulated DC output for industrial, signage and automation projects.
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Power Adapter
Wall-mount and desktop adapters with US / EU / UK / AU plugs, custom output voltage, cable and DC connector.
View More Why Choose Us
Engineering Depth Buyers Can Verify
Capabilities confirmed through on-site third-party inspection by Intertek
In-House Design
Our engineers calculate core size, turns, wire gauge and insulation system for each application rather than relabeling stock parts.
Competitive OEM Factory
Dedicated winding, cutting, wrapping and crimping equipment supports consistent batches from pilot runs to repeat orders.
Multi-Stage Quality Control
On-site material inspection, semi-finished testing, aging and final hi-pot checks follow a documented supplier assessment procedure.
Deep Customization
Voltage, power, footprint, terminals, shielding, varnish or epoxy potting, labeling and packaging tuned to your BOM.
Verified by IntertekOn-site assessed Custom Manufacturer
Company Profile
Shaanxi Zelqo Power Co., Ltd.
Based in Xi'an, Shaanxi, we are a manufacturer and trading company specializing in magnetic components and power conversion products: toroidal transformers, low frequency transformers, high frequency transformers, switching mode power supplies, power adapters and coil inductors.
We work with OEM brands, equipment makers and distributors who need a transformer that fits their circuit, enclosure and compliance target. Every project starts with an engineering review of your specification and ends with documented electrical testing before packing.
4.8/5Buyer Rating
5+Years Export
25+Process & Test Stations
5Core Product Lines
Verified
See the Production Floor Before You Order
A 2.5-minute walkthrough of our winding lines, testing stations and packing area, so your sourcing team can evaluate capability remotely.
Watch Video
Our team, customer visits and company activities
Factory Display
Inside Our Manufacturing & QC
Real photos from each step: from core insulation to finished goods inspection
Each unit passes semi-finished and aging tests before final packing; defective units are isolated and traced back to the winding station.
What each instrument verifies: LCR bridge for inductance and leakage inductance, DC low resistance tester for winding resistance, impulse tester for inter-turn insulation, hi-pot for primary-to-secondary dielectric strength, AC source and power meter for no-load loss, efficiency and regulation.
Exhibitions & Certificates
Meeting Buyers Worldwide
Trade show presence and certification documents that support your supplier approval
Our Certificates
Product Lines In Depth
Choose the Right Magnetic & Power Solution
Typical configurations we build; every parameter can be adapted to your design
01 / HIGH FREQUENCY
High Frequency Transformer
For switch-mode designs where size, efficiency and EMI matter. We match core material and geometry to your topology and switching frequency.
- Flyback, forward, push-pull and LLC topologies
- Triple-insulated wire & margin tape for reinforced isolation
- Fast prototype samples for circuit validation
EE / EI / EF Ferrite Core Transformer
General-purpose SMPS magnetics for adapters, chargers and auxiliary supplies.
View rangeFlyback Transformer
Gapped-core designs for isolated low-to-mid power converters with low standby loss.
View rangePQ / RM Core Transformer
Higher power density and better shielding for compact industrial and LED driver boards.
View rangeCommon Mode Choke & Coil Inductor
EMI filtering and energy storage inductors to complete your power stage.
View range 02 / LOW FREQUENCY
Low Frequency Transformer
Line-frequency transformers for control circuits, instruments and appliances that need robust galvanic isolation and simple, reliable operation.
- 50 / 60 Hz, single or multiple secondaries
- Global input voltages, step-up or step-down
- Optional thermal fuse, varnish or encapsulation
EI Laminated Power Transformer
Silicon steel EI core for chassis or PCB mounting in control and appliance circuits.
View rangeSingle Phase Isolation Transformer
Separates load from mains to improve operator safety and reduce noise coupling.
View rangeStep Up / Step Down Transformer
Adapts equipment between 110/120 V and 220/240 V markets for exporters and OEMs.
View rangeEncapsulated PCB Transformer
Potted, sealed transformers for humid, dusty or vibration-prone environments.
View range 03 / TOROIDAL
Toroidal Transformer
A wound ring core gives lower stray magnetic field, lower mechanical hum and smaller size than an equivalent EI design: ideal for audio and sensitive electronics.
- Low noise and low stray field for audio gear
- Custom mounting: center bolt, cup or PCB
- Electrostatic shield and epoxy fill options
Audio Amplifier Toroidal Transformer
Dual secondaries for amplifier rails with minimal hum injection into the signal path.
View rangeToroidal Isolation Transformer
Quiet, efficient isolation for instruments, lighting systems and laboratory equipment.
View rangeElevator Control Auto Transformer
Supplies control and brake circuits in elevator cabinets with stable multi-tap outputs.
View rangeCustom Potted Toroidal
Epoxy-filled toroids with flying leads or terminals for rugged, sealed assemblies.
View range 04 / SMPS
Switching Power Supply
AC-DC switching power supplies with regulated output for LED lighting, CCTV, automation and industrial control, available in enclosed or weather-resistant housings.
- Over-voltage, over-current and short-circuit protection
- Full-load aging before shipment
- Custom voltage, current and housing
Enclosed Switching Power Supply
Metal-case units for cabinets, signage and automation with screw terminal wiring.
View rangeRainproof Switching Power Supply
Weather-resistant housings for outdoor lighting, billboards and street installations.
View rangeLED Strip Driver Power Supply
Constant-voltage drivers sized for LED strip runs with low ripple to prevent flicker.
View rangeRegulated DC Power Supply
Stable regulated DC output for control boards, test benches and telecom equipment.
View range 05 / ADAPTER
Power Adapter
External AC-DC adapters for consumer electronics, routers, small appliances and IoT devices, delivered under your brand.
- US, EU, UK, AU plug types and desktop styles
- Custom output, cable length and DC connector
- Logo printing and retail-ready packaging
Wall-Mount Power Adapter
Plug-in adapters for routers, cameras and small devices with compact housings.
View rangeDesktop Power Adapter
Higher-wattage brick adapters with IEC inlet for monitors, printers and equipment.
View rangeInterchangeable Plug Adapter
One SKU with swappable US / EU / UK / AU plugs to simplify multi-market distribution.
View rangePrivate Label Adapter
Custom label, housing color, cable and DC jack to match your product line.
View range Buyer's Guide
How to Source a Custom Transformer
A clear specification saves weeks; here is what our engineers need and what happens next
Your Specification Checklist
- Input: voltage range and frequency (e.g. 230 VAC 50 Hz, or 85–265 VAC for SMPS)
- Output: voltage(s), current per winding and rated power (VA / W)
- High frequency designs: topology, switching frequency and controller IC
- Safety: insulation class, hi-pot voltage, target standard (e.g. IEC 61558, IEC 62368-1)
- Mechanical: max dimensions, mounting, terminals or lead length
- Environment & volume: ambient temperature, humidity and annual quantity
Engineering Review
We check your requirements for feasibility, propose core and insulation construction, and flag any cost or size trade-offs.
Sample Build
Prototypes are wound and measured with LCR, resistance and hi-pot equipment; a test record ships with the samples.
Customer Validation
You test in-circuit; we adjust turns, gap or wire based on your temperature-rise and efficiency results.
Mass Production
Approved parameters are frozen; incoming materials and semi-finished units are inspected at each stage.
Final Inspection & Shipping
Aging, impulse and hi-pot tests, then export packing. Lead time is confirmed at the engineering review stage.
Buyer Feedback
Trusted by Overseas Buyers
Real feedback from B2B customers after delivery
Team Online
Dedicated Engineers, One Point of Contact
Every project is assigned a sales engineer who speaks your technical language, follows samples through testing and keeps you updated until delivery.
- Email[email protected]
- OfficeRoom 1306, Poly Zhongda Plaza, Fengcheng 10th Road, Xi'an, Shaanxi, China
- Working HoursMon–Sat, GMT+8 · We aim to reply within 24 hours
FAQ
Questions Buyers Ask Us
What information do you need to design a custom transformer?
Please share input voltage and frequency, output voltage(s) and current, rated power, operating frequency for high frequency designs, isolation and safety requirements, size or mounting limits, ambient temperature, target standards and estimated annual quantity. A circuit diagram or reference sample speeds up the engineering review.
Do you support OEM and ODM projects?
Yes. We build to customer drawings (OEM) and also develop designs from your electrical specification (ODM), including private labeling, custom packaging and connector or cable changes.
Which tests are performed before shipment?
Depending on the product, inspection includes LCR measurement, DC winding resistance, impulse winding test, hi-pot dielectric strength test, power and efficiency measurement with an AC power source and digital power meter, aging test and final visual inspection.
Can you design to international safety standards?
Designs can be engineered to target requirements such as IEC 61558 for transformers or IEC 62368-1 for power adapters. Certification scope and available test reports are confirmed for each specific model during the engineering review.
Toroidal or EI transformer: which should I choose?
Toroidal transformers are smaller, quieter and radiate less magnetic field, making them preferred for audio and sensitive electronics. EI laminated transformers are cost-efficient, easy to mount on PCBs or chassis and well suited to general control circuits. Our engineers can recommend the best option for your enclosure, budget and noise requirements.
Where is Shaanxi Zelqo Power Co., Ltd. located?
Our office is at Room 1306, Poly Zhongda Plaza, Fengcheng 10th Road, Xi'an, Shaanxi, China. The supplier's on-site operations have been verified by Intertek.