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1000VA Low EMI Toroidal Transformer for Power Amplifier

OEM 1000VA Toroidal Transformer for Hi-Fi Audio Amplifiers

Rated power	1000VA
Input	110V–240V AC
Output	50V-0-50V AC or customized
Frequency	50/60Hz
Winding	Copper
Insulation	Class B or customized
Application	Audio/Amplifiers
Customization	Voltage, dimensions, wires, shielding

Overview
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High Performance Products For Your High Performance Applications

SMALL SIZE Most toroids are smaller than their E-I transformer counterparts. Electrical and mechanical designers appreciate a toroid’s compact dimensions. They are particularly well suited where low height is a consideration.	LOW STRAY MAGNETIC FIELD Toroids have no airgaps: primaries and secondaries are wound uniformly around the entire core. As a result, toroids emit very low radiated magnetic fields. This makes the toroid ideal for applications involving high sensitivity circuitry.	HIGH EFFICIENCY Due to its unique construction, toroids are typically between 15 and 30% more efficient than the conventional type. As a rule; the larger the transformer, the more efficient it becomes.
LOW MECHANICAL HUM The core of a toroid is formed from a single strip of grainoriented electrical grade silicon steel tightly wound in the form of a clock spring with the ends spot-welded in place. The copper wire is wound over polyester film, forming a silent, stable unit without the use of environmentally unfriendly glues or varnishes.	FLEXIBLE DIMENSIONS Compounding the benefits of low weight and small size isthe flexibility to vary dimensions. Because ECKO is not tied down to core caps or lamination sizes, the height and diameter of our toroids may be economically varied to accommodate equipment design requirements.	LOW WEIGHT Because they are more efficient, toroids can be up to 50% lighter, (depending on power rating), than conventional laminated transformer. Low weight simplifies end product design by reducing mounting hardware and supporting enclosure requirements.
LOW NO-LOAD LOSSES Compared to conventional E-I transformer, toroids exhibit extremely low no-load losses. In applications where a circuit is in a “stand-by” mode for long periods, the potential cost reduction for power can be significant, sometimes 80-90%.	LOW OPERATING TEMPERATURE Since most of the losses in a toroid are in the copperwire, the toroid cools off quicker than the conventional E-I type with more iron. At half the load, the toroid’s temperature rise is only about 30% of what it is at full load.	EASY TO MOUNT A single-center screw easily and quickly mounts the toroid, avoiding costly mechanical design and practical problems associated with conventional E-I-laminated transformers... and three screws are eliminated at assembly!

Rated Power (VA)	Voltage Regulation (%)	Efficiency (%)	Dimension(mm)		Weight (Kg)
Rated Power (VA)	Voltage Regulation (%)	Efficiency (%)	Height(C)	Diameter(A)	Weight (Kg)
30	16	83	30	80	0.60
100	11	88	42	100	1.30
150	7.30	90	45	115	1.85
200	6.2	91	53	123	2.30
250	5.60	92	53	128	2.60
300	5.30	93	55	135	3.00
400	4.60	94	60	140	3.80
500	4.30	95	66	146	4.50
800	4.0	95	85	160	7.00
1000	3.80	96	90	165	8.50
1200	3.30	96	95	168	9.00
1500	3.0	96	100	173	9.50
2000	2.90	96	110	183	13.00
4000	2.2	97	135	245	23.00
5000	2.1	98	145	270	28.00

*The parameter is only for reference as typical data, customized are welcomed.
*We are able to provide you 20VA to 25KVA toroidal transformer.

QUALIT Y TO THE CORE

Electrostatic Shield (Customer Specified) • Reduces capacitive coupling between primary and secondary windings. • Copper foil (2 mil) laminated between polyester film and tape. • Tightly wound over primary insulation.	Primary to Secondary Insulation • Polyester film-Class B (130°C) • Four layers minimum between windings • Meets test requirement of 4000V RMS for 1 minute between primary and secondary.	Windings • Base coat of Polyester. Heavy topcoat of amide imide (200°C) • Wound uniformly over entire core • Better heat dissipation • Windings configured for minimum flux leakage • Low voltage maintained between adjacent turns	Thermal Protection (Customer Specified) • Usually in primary circuit • Normally closed-auto reset opens at high temperature • One-shot fuse also available	Core Insulation • All cores: 100% surface coverage of four layers of 2 mil polyester film Class B (130°C) • Protects, insulates and cushions the core from windings and reduces vibration
Core • Cores are manufactured and annealed in-house, under controlled conditions • Continuous tightly wound grain oriented silicon steel...no airgaps, no mechanical noise • Lathed radial corners... compact design, most efficient use of materials • No core caps necessary	Magnetic Shield (Customer Specified) • Multiple layers of grain oriented silicon steel tightly wound around the toroid’s circumference • Fixed in place by outer insulation	Outer Insulation • Tape wound type: Standard two layers polyester film Class B (130°C) • Magnetic enclosures optional	Center Hole Potting (Customer Specified) • Thermoplastic material • High mounting precision • Threaded insert or press fitted stud is optional • Thermally conductive compound available	Wire Leads • Choice of two types of leads connected to windings: Self leads: The magnet wire is extended through sleeving for connection to circuit. Standard: Class A (105°C) Stranded wire leads: Class A (105°C) - Class H (180°C) • Each lead anchored to toroid body with high tensile strength tape to withstand severe pull test • Primary leads covered with second layer of sleeving - double insulation... standard on all units • Color, length, stripping and terminations can be customer specified.

Customization Options

Why Choose ECKO?

Transformer Manufacturing

Experience over

20+ Years

Engineering Design Support

Prototype Production

100% Electrical Testing

Custom Low-volume Production

Material Traceability

Drawing and Sample Approval

Production and Test Documentation

Quality Control

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Finished Products-Impulse Test

custom 1000w toroidal transformer for power amplifiers-2

Patrol Audit

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Raw Material Inspection

custom 1000w toroidal transformer for power amplifiers-4

Final Product QC

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Inductive voltage test

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No-load voltage

How to Customized with Us?

Step 1 Share Your Requirements Reach out to us either via email or by filling out the submission form on our website. Then our dedicated sales support team will promptly respond to your inquiry.	Step 2 Receive Your Quote Within 24 hours, our sales team will provide you with a personalized quote tailored to your project requirements. Prior to finalizing your order, we ensure transparency and confidence by sending product samples directly to you.
Step 3 Confirm Your Order After carefully reviewing the product samples, proceed to confirm your bulk order with us. Rest assured, we’ll oversee your order to guarantee that the manufacturing process upholds the highest quality standards.	Step 4 Product Management and Fulfillment Our efficient product management and production team ensure timely delivery. Your product are safeguarded with utmost care, as our warehouses prioritize safety and security.

FAQ

Q:How do you reduce hum and electromagnetic interference in audio transformers?	For sensitive audio applications, several design methods can be used to reduce interference, including: Optimized toroidal core design Controlled winding process Electrostatic shielding between primary and secondary windings Magnetic shielding where required Proper grounding arrangements Low-noise mechanical mounting High-quality insulation materials These options can be customized according to the amplifier's EMI and noise requirements.
Q: Can you reduce the inrush current of a 1000W toroidal transformer?	High-power toroidal transformers can produce relatively high inrush current during startup. Depending on the application, the transformer design can be optimized to help control inrush current. For high-power amplifier systems, an external soft-start or inrush-current limiting circuit may also be recommended. Please inform us of your amplifier's startup requirements so that we can recommend a suitable solution.
Q: What materials are used in your 1000W toroidal transformers?	Toroidal transformers can be manufactured using high-grade CRGO silicon steel cores and copper windings. The insulation system, wire specification, thermal protection, shielding, lead wires, connectors, and mounting accessories can be selected according to the customer's electrical, thermal, safety, and mechanical requirements.
Q: What is the typical temperature rise?	Temperature rise depends on rated load, input voltage, output current, ambient temperature, enclosure ventilation, transformer dimensions, and the customer's design requirements. For our standard toroidal transformer designs, temperature rise can typically be controlled to ≤65°C under specified test conditions. If your amplifier requires lower temperature rise or continuous high-load operation, we can optimize the transformer accordingly.
Q:Do you provide electrostatic shielding for audio amplifier transformers?	An electrostatic shield can be added between the primary and secondary windings. This can help reduce capacitive coupling and high-frequency common-mode interference between the mains supply and secondary circuits, which can be beneficial in sensitive audio equipment. Magnetic shielding solutions can also be discussed for applications with particularly strict stray-field requirements.
Q:What protection options are available?	Depending on the application, we can integrate or provide options such as: Thermal fuse Thermal switch Primary-side protection Reinforced insulation Electrostatic shield Protective insulation tape Custom grounding leads Protection requirements can be customized according to the amplifier design and applicable safety standards.
Q:Do you perform 100% testing before shipment?	Transformers are inspected and tested before shipment according to the specified quality requirements. Typical inspections can include: Input and output voltage test No-load current test No-load loss test Hi-Pot / dielectric withstand test Insulation resistance test Winding continuity test Turns ratio verification Appearance and dimensional inspection Additional testing can be arranged according to customer requirements.