FAQ

The primary voltage, operating frequency, secondary voltage and current for each winding, total rated power in VA, maximum outer diameter and height, minimum inner diameter if restricted, mounting method, lead-wire or connector requirements, insulation class, shielding requirements, temperature-rise limit, no-load current or inrush-current requirements, required safety standards and estimated order quantity. Information about the end-use application and operating environment will help us recommend the most suitable core, winding structure and insulation system.

Transformer dimensions can be customized to fit the available space inside your equipment. Depending on the transformer type, we can adjust the core dimensions, height, outer and inner diameter.

Optimize the transformer design to reduce inrush current by adjusting the operating flux density, primary turns, core material and size, winding construction and manufacturing consistency. For higher-power transformers, the best solution may combine transformer optimization with an NTC thermistor, soft-start circuit or external inrush-current limiter. Please provide the breaker type, rated current, equipment circuit and acceptable peak-current requirement for engineering evaluation.

Electrostatic and magnetic shielding options according to the application. An electrostatic shield between the primary and secondary windings can help reduce capacitive coupling and common-mode noise. Magnetic shielding, flux bands or metal enclosures can help reduce stray magnetic fields. Other options include a shield lead, core grounding, copper shielding bands, optimized lead routing and encapsulation. The most suitable method depends on whether the main concern is leakage capacitance, electrical noise, EMI or stray magnetic flux.

Manufacturing transformers with independent isolated outputs, center-tapped outputs, series or parallel windings, symmetrical positive and negative outputs, and main plus auxiliary outputs. For each winding, specifying the voltage, current, loading condition and whether electrical isolation is required. Because the loading of one winding can affect the regulation of other windings, expected simultaneous and individual load conditions should be provided during the design stage.

Design targets and measured values for inductance and no-load current when these parameters are relevant to the application. For repeatable inductance data, please specify the winding, test frequency, test voltage, winding connection, measurement temperature and, where required, the test instrument or method. No-load current is normally measured at the specified input voltage and frequency with all secondary windings open. Sample data and production test records can be provided according to the agreed inspection plan.

Both IP65 and IP67 indicate dust-tight protection. IP65 products are protected against water jets and are commonly used for outdoor equipment exposed to rain, spray or routine cleaning. IP67 products are protected against temporary immersion under defined test conditions and are normally selected where short-term water exposure is more likely. The stated IP rating applies to the complete enclosure under specified test conditions; cable entries, connectors, seals, installation orientation and assembly methods can affect the final protection level. Continuously submerged applications should be reviewed separately.

RoHS-related documents can be provided for applicable products and materials. Please confirm the target market and model so we can check the corresponding documents.

The inspection plan is determined by the transformer type, approved specification and applicable standard. Typical routine tests may include visual and dimensional inspection, continuity, winding resistance, turns ratio, polarity, no-load voltage, no-load current, full-load output voltage, voltage regulation, insulation resistance, Hi-Pot, leakage current and functional testing. Additional validation or batch tests can include temperature rise, efficiency, inrush current, noise and vibration, overload, IP protection and customer-specific equipment testing. The test items, sampling level and acceptance criteria can be defined in the approved specification or quality agreement.

For many standard customized transformer projects, the typical sample lead time is approximately 1–3 working days after the specification, drawing and materials have been confirmed. We will confirm the estimated sample completion date after reviewing the complete technical requirements.

We provide prototype and sample production for electrical, mechanical and application testing. Before production, our engineering team will review the electrical specification, dimensions, wiring or pin configuration, insulation requirements, mounting method, applicable standards and required tests. A dimensional drawing or technical specification can be submitted for approval before the sample is manufactured, and sample test data can be provided when required.

MOQ depends on the transformer model, material, customization level, and packaging requirements. Please share the exact specifications, and we will check the minimum order quantity for you.