Main Transformer / Inverter Circuit

Product Specifications

Technical details and manufacturing context for Main Transformer / Inverter Circuit

Definition

The Main Transformer / Inverter Circuit is a critical component of the Power Source Unit, responsible for voltage transformation and DC-to-AC power inversion. It enables stable power delivery to connected equipment by stepping up or down voltage levels and converting direct current (DC) input into regulated alternating current (AC) output. This circuit is essential in applications such as motor drives, uninterruptible power supplies (UPS), and industrial power systems where precise voltage and frequency control are required. The transformer section uses copper windings and ferrite or steel laminations to achieve the desired voltage ratio, while the inverter section employs semiconductor switching devices like IGBTs and MOSFETs to perform the DC-to-AC conversion. Pulse-width modulation (PWM) techniques are used to regulate the output voltage and frequency, ensuring high efficiency and low harmonic distortion. The circuit is designed to operate within specified parameters, including rated power from 100 to 500 kVA, input voltage of 380–480 V AC (three-phase), and adjustable output voltage and frequency up to 400 V and 400 Hz, respectively. Efficiency is at least 95% at full load, and insulation class F–H ensures thermal endurance. Cooling methods include air natural (AN) or forced air (AF). The operating temperature range is -10 to 50 °C, and protection ratings vary from IP20 to IP54 depending on the environment. Noise levels are kept at or below 65 dB(A) at 1 meter distance. The physical characteristics, such as weight (500–2000 kg) and dimensions (1200×800×1500 mm for a typical 500 kVA unit), depend on the power rating. This component is designed to meet relevant IEC standards, including IEC 60076 for transformers and IEC 60038 for voltage levels. However, it is essential to verify model-specific values and standards with the legal manufacturer or supplier, as actual specifications may vary based on the application and configuration.

Working Principle

The Main Transformer / Inverter Circuit operates by first using transformer windings to step up or down the incoming AC voltage to a desired level. The transformer core, made of ferrite or steel laminations, efficiently transfers energy through electromagnetic induction. The inverter section then converts DC power, which may be derived from a rectifier or battery, into AC power using semiconductor switching devices such as IGBTs or MOSFETs. These switches are controlled via pulse-width modulation (PWM) to produce a regulated AC output with adjustable voltage and frequency. The PWM technique rapidly switches the devices on and off, creating a series of pulses that are filtered to produce a smooth sinusoidal waveform. This allows precise control of the output, enabling variable speed operation of motors or stable power supply to sensitive equipment. The circuit also includes protection and monitoring features to ensure safe operation under various load conditions.

Common Materials

Copper windings, Ferrite/steel laminations, Silicon semiconductor devices, PCB substrate

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Power	100–500 kVA	Determines transformer size and costIEC 60076
Input Voltage	380–480 V AC	Typical three-phase gridIEC 60038
Output Voltage	0–400 V AC	Adjustable for inverter control
Output Frequency	0–400 Hz	Variable for motor speed control
Efficiency	≥95 %	At full loadIEC 60076-1
Insulation Class	F–H	Thermal endurance of insulationIEC 60085
Cooling Method	AN–AF	Air natural or forcedIEC 60076-2
Operating Temperature	-10–50 °C	Ambient rangeIEC 60068-2-1
Protection Rating	IP20–IP54	Higher for harsh environmentsIEC 60529
Noise Level	≤65 dB(A)	At 1m distanceIEC 60076-10
Weight	500–2000 kg	Depends on power rating
Dimensions (L×W×H)	1200×800×1500 mm	Typical for 500 kVA

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Transformer Core Part
Provides magnetic flux path for voltage transformation

Material: Silicon steel laminations
Primary/Secondary Windings Part
Conduct electrical current for voltage step-up/down

Material: Enameled copper wire
Inverter Bridge
Switches DC to AC using semiconductor devices

Material: IGBT/MOSFET modules
Heat Sink Part
Dissipates heat from power semiconductors

Material: Aluminum alloy
Output Filter
Turns the PWM pulse train into the smooth sine the load actually needs.
Protection and Monitoring Circuit
Watches load and temperature and shuts the bridge down before it is damaged.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Power Source Unit

View system integration details

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Frequently Asked Questions

What is the function of the Main Transformer / Inverter Circuit?

It transforms voltage levels and converts DC input to regulated AC output, ensuring stable power delivery to connected equipment.

What are the typical input and output voltage ranges?

Input voltage is typically 380–480 V AC (three-phase), and output voltage is adjustable from 0 to 400 V AC.

What standards apply to this component?

Relevant standards include IEC 60076 for transformers, IEC 60038 for voltage levels, and IEC 60085 for insulation classes. Always verify compliance with the manufacturer.

How does the inverter achieve variable frequency output?

The inverter uses PWM control of semiconductor switches (IGBTs/MOSFETs) to adjust the output frequency, typically from 0 to 400 Hz, enabling motor speed control.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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pressure:	Atmospheric to 1.5 bar (sealed enclosure dependent)
other spec:	Input voltage range: 85-265V AC, 100-400V DC; Output frequency: 50/60 Hz ±5%; Efficiency: >92% at full load; Insulation class: H (180°C)
temperature:	-40°C to +85°C (operating), -55°C to +105°C (storage)

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