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High Frequency Transformer EL19 with 0.9mH/1.25mH Inductance Customizable for High Efficiency in Power Conversion Circuits

High Frequency Transformer EL19 0.9mH/1.25mH Inductance Can Be Customized For High-frequency Circuits/switching Power Supplies/inverters

1.Product Description

This EL19 series high-frequency transformer has two standard inductance values of 0.9mH and 1.25mH, and can be fully customized according to your design requirements. It adopts high-quality ferrite core, optimized for high-frequency working environment, with high efficiency, low loss and excellent thermal stability. This transformer is an ideal core component for high-frequency, high-power density power conversion circuits such as switch mode power supplies (SMPS), photovoltaic inverters, and electric vehicle charging stations, which can effectively improve the overall performance and reliability of the system.

Detailed explanation of the core functions of EL19 series high-frequency transformers

1. Core electrical energy conversion and regulation functions

Voltage/current conversion: As a basic function of transformers, it efficiently converts input voltage and current into the required output voltage and current based on the turns ratio of primary and secondary coils, achieving energy transfer and isolation between circuits.

Impedance matching: By designing specific turns ratios, the impedance between the front and rear circuits is optimized to ensure efficient power transmission, reduce signal reflection, and improve overall system efficiency.

Electrical isolation: Establishing a reliable high insulation barrier between primary and secondary circuits, effectively blocking DC components and common mode interference, ensuring system safety and stability, is the core requirement for safe design of switching power supplies.

2. Optimization performance for high-frequency applications

High frequency and low loss operation: using low loss and high permeability ferrite cores, specially designed for high-frequency switch circuits from kHz to several hundred kHz, can significantly reduce core loss (iron loss) and coil copper loss, and improve energy efficiency.

Suppressing high-frequency noise and spikes: Excellent design and craftsmanship can effectively suppress electromagnetic interference (EMI) and voltage spikes caused by high-frequency switches, making the output purer and beneficial for electromagnetic compatibility certification.

Fast dynamic response: Thanks to high-frequency characteristics and optimized magnetic circuit design, it can quickly respond to load changes, provide stable energy supply for switching power supplies, and ensure stable output voltage.

3. Physical and reliability assurance functions

Compact power package: The EL19 magnetic core size (with an outer diameter of approximately 19mm) achieves excellent power processing capabilities within a limited volume, contributing to device miniaturization and lightweighting.

Excellent thermal stability: The magnetic core and coil materials can maintain stable performance over a wide temperature range, with good heat dissipation performance, ensuring controllable temperature rise and long-lasting service life of the transformer during continuous operation.

High structural strength and consistency: Adopting vacuum impregnation and other processes to ensure a strong bond between the coil and the magnetic core, moisture-proof and shockproof, high mechanical strength, and consistent and reliable performance of bulk products.

4. Customization and adaptation functions

The inductance value can be customized: in addition to the standard 0.9mH and 1.25mH, the required inductance can be precisely designed and customized according to the customer's specific circuit topology (such as flyback, forward, LLC) and operating frequency to optimize system performance.

Multi pin and tap configuration: Multiple sets of secondary outputs, center taps, and other coil structures can be provided to meet the needs of multiple outputs or specific circuits (such as push-pull and full bridge).

Wide range application adaptation: Its functional design enables it to perfectly adapt to various high-performance and high reliability scenarios such as switching power supplies (AC-DC, DC-DC), photovoltaic/energy storage inverters, electric vehicle charging modules, industrial control power supplies, communication equipment power supplies, etc.

2.Performance Characteristics

Category	Feature	Description / Specification	Benefit / Impact
Electrical Performance	High Frequency Operation	Optimized for operation in the kHz to several hundred kHz range.	Enables high switching frequency design, leading to smaller peripheral components (e.g., capacitors, inductors) and higher power density.
	High Efficiency & Low Loss	Utilizes low-loss ferrite core and precision winding to minimize core loss (Pv) and copper loss (Pcu).	Increases overall system efficiency, reduces thermal stress, and improves energy savings.
	Excellent Inductance Stability	Stable inductance under varying load, temperature, and frequency conditions.	Ensures consistent circuit performance, reliable output, and predictable behavior in dynamic applications.
	Low Leakage Inductance	Tightly coupled winding structure minimizes leakage inductance.	Reduces switching voltage spikes, lowers stress on power switches (e.g., MOSFETs), and improves EMI performance.
Thermal & Reliability	Excellent Thermal Stability	Core and winding materials maintain stable magnetic properties over a wide operating temperature range (e.g., -40°C to +125°C).	Guarantees reliable performance in harsh environments and under continuous full-load operation.
Thermal & Reliability	Low Temperature Rise	Efficient design and materials result in minimal temperature rise (ΔT) during operation.	Extends component lifespan, enhances long-term reliability, and allows for simpler thermal management.
Physical & Construction	Compact Size & High Power Density	EL19 core size (approx. 19mm outer diameter) delivers significant power handling in a minimal footprint.	Facilitates miniaturization of end products, saves valuable PCB space, and enables lightweight designs.
	Robust Mechanical Structure	Vacuum impregnation with varnish ensures windings are rigid, protected from moisture, vibration, and physical stress.	Improves durability, prevents acoustic noise (whining), and ensures consistent performance in demanding applications.
	High Insulation & Safety	Class B (130°C) or higher insulation system. High Hi-Pot (isolation voltage) withstand capability (e.g., >1500VAC).	Provides safe electrical isolation between primary and secondary, meeting international safety standards.
EMI & Signal Integrity	Low Electromagnetic Interference (EMI)	Symmetrical winding and shielding techniques (if applicable) reduce radiated and conducted noise.	Simplifies EMI filter design, helps end products comply with EMC regulations (e.g., FCC, CE).
EMI & Signal Integrity	Minimal Parasitic Capacitance	Careful inter-winding construction controls inter-layer capacitance.	Improves high-frequency response and reduces common-mode noise in sensitive circuits.
Customization Flexibility	Adjustable Inductance Value	Standard 0.9mH and 1.25mH options, with full customization available to match specific circuit requirements (e.g., LLC resonant, flyback).	Allows for precise optimization of circuit performance (ripple, gain, etc.) for different topologies and frequencies.
	Flexible Pinout & Taps	Custom winding configurations, multiple outputs, and center taps can be provided.	Offers design versatility to support various circuit topologies (push-pull, full-bridge) and multi-rail power supplies.
	Material & Specification Options	Choice of core grade (e.g., PC95, PC44), wire type, and insulation materials based on application needs.	Balances performance, cost, and specific requirements like high-temperature operation or ultra-low loss.

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