Transformers used in inverters and UPS systems live in a demanding environment. They may see fast switching edges, high peak currents, battery-side voltage variation, overload events, heat from power semiconductors, and long operating hours. A transformer that is acceptable in a simple power circuit may not be stable enough for inverter or UPS duty.
BaoHui Tech manufactures transformers, inductors, filters, and custom magnetic components for inverter systems, UPS equipment, industrial power supplies, renewable energy equipment, and related electronics.
Understand where the transformer sits in the system
In an inverter or UPS, the transformer may be used for isolation, voltage step-up, voltage step-down, gate drive, auxiliary power, filtering, or energy transfer in a high frequency stage. Each position has different requirements. A main power transformer has different thermal and insulation concerns than a small driver transformer.
Waveform matters
Inverter waveforms are not always clean sine waves at the transformer terminals. PWM switching, harmonic content, fast dv/dt, and transient overloads can increase losses or stress insulation. A transformer designed only from RMS voltage may miss these details.
Thermal design should include overload conditions
UPS and inverter systems often need short-term overload capacity. The transformer must handle these events without unsafe temperature rise or insulation damage. The rated load, peak load, overload duration, cooling method, and ambient temperature should all be shared during design.
Isolation and safety are central
Many inverter and UPS designs require electrical isolation between input, output, battery, control, and user-accessible circuits. The transformer may be part of the safety barrier. Creepage distance, clearance distance, insulation class, hipot test voltage, and material selection must match the application.
EMI performance starts in the magnetic design
EMI is often treated as a filter problem at the end of development, but transformer construction can contribute to common-mode noise, leakage inductance, ringing, and coupling between windings. Shielding, winding order, sectional bobbins, and layout cooperation can make a measurable difference.
FAQ
What transformer is used in an inverter?
Depending on the inverter design, it may use a high frequency transformer, a low frequency output transformer, driver transformers, auxiliary power transformers, inductors, and common mode filters.
Can BaoHui Tech provide custom transformers for UPS systems?
Yes. BaoHui Tech can manufacture custom transformers and magnetic components for UPS and inverter systems based on voltage, power, frequency, insulation, and size requirements.