Voltage & Frequency Converter

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Website: http://wenlida-tech.com/1-4-voltage-frequency-converter.html

Frequency converter power supply for adjustable voltage and frequency in global power compatibility and testing applications

Rated capacity: 3–1000 kVA
Input phase number: single-phase, three-phase (customized input phase configurations available upon request)
Output phase number: single-phase, three-phase (customized output phase configurations available upon request)
Rated input voltage: single-phase 220 V (± 20 %), three-phase 380 V (± 20 %) (customizable upon request)
Rated output voltage: single-phase 0–300V, three-phase 0–520V (higher voltage ranges are customizable upon request)
Frequency: 47–63Hz (customizable upon request)
Output voltage: single-phase 220V (± 20%), three-phase 380V (± 20%) (customizable upon request)
Frequency: selectable adjustable mode: 41–73Hz (customizable range 5–1000Hz), fixed mode: 50 / 60 / 400Hz (optional fixed frequency 100 / 200Hz)
Efficiency: ≥ 85%

Voltage and frequency converters use AC-DC-AC conversion technology to transform incoming power into a clean, adjustable sine wave output. They provide stable voltage, precise frequency control, and clean sine wave output in a single integrated unit. The converters handle resistive, inductive, capacitive, and mixed loads with ease, while their flexible control system allows them to reproduce various grid standards or specific working conditions. They’re widely used in testing environments, research facilities, and projects that involve adapting power systems to different grid standards around the world.

Features

Voltage and frequency converters use IGBT (Insulated Gate Bipolar Transistor) and SPWM (Sinusoidal Pulse Width Modulation) technology to deliver a clean sine wave output with ultra-low harmonic distortion.
Designed for high energy efficiency and stable long-term performance, featuring low no-load losses and the ability to handle short-term overloads, which is suitable for high-power applications.
These converters ensure excellent power quality with precise control of voltage and frequency. Output settings can be adjusted smoothly and continuously, supporting quick switching between international grid standards.
Capable of handling sudden load variations within milliseconds, keeping voltage stable so that precision instruments and testing equipment continue running smoothly.
A modular design and intelligent control system allow integration with PLC networks for remote operation and automation management.
Multiple protection functions, such as overvoltage, overcurrent, and short-circuit protection, work together with low-noise cooling to enhance reliability in demanding environments.
DSP digital control technology ensures precise voltage and frequency output, maintaining an accuracy level of ±1%.
They can be easily upgraded with communication interfaces including RS232, RS485, CAN, or RJ45, all supporting the MODBUS-RTU protocol for remote monitoring.
With a THD (Total Harmonic Distortion) level as low as 2% (and ≤0.1% for advanced models), the converters provide a pure and stable power output suitable for precision instruments.
Each converter is equipped with an isolation transformer that separates the input from the output, helping reduce electromagnetic interference and ensuring safer, more stable operation.

Specifications

Product type		Voltage & Frequency Converter
Phase number		Input: single-phase / three-phase	Output: single-phase / three-phase
		Customized input and output phase configurations available upon request
Rated capacity		3–1000kVA
Model		VFP-#####KVA
Efficiency		≥85%
Input	Voltage	Single-phase 220V (±20%)	Three-phase 380V (±20%)
		Customizable upon request
	Frequency	47–63Hz Customizable upon request
Output	Voltage	Single-phase 0–300V (adjustable)	Three-phase 0–520V (adjustable)
		Higher voltage ranges are customizable upon request
	Voltage stability (average)	±1% Higher accuracy are customizable upon request
	Frequency stability	< 0.1%
	Frequency	Selectable 1. Adjustable mode: 41–73Hz (customizable range 5–1000Hz) 2. Fixed mode: 50/60/400Hz (optional fixed frequency 100/200Hz)
	Response time	≤2ms for input voltage variations
	Total harmonic distortion (THD)	≤2% for linear loads
	Phase shift	Three-phase balanced load: ≤±1°
		No-load: ≤±1°
		100% three-phase imbalance: ≤±4°
Overload capacity		120% for 1 hour 150% for 1 minute 200% for 20 seconds
Withstand voltage		1500Vac /10mA, no breakdown
Noise level		≤60dB at 1m distance from equipment
Cooling method		Selectable 1. Natural air cooling (AN) 2. Forced air cooling (AF)
Enclosure protection level		IP20 as standard (higher protection levels are customizable upon request)
Communication protocol		Selectable 1. RS485 2. MODUBUS-RTU
Control method		Selectable 1. Voltage closed-loop control 2. Current closed-loop control 3. VF curve control
Display		Display panel for parameters, fault diagnosis, and real-time electrical data
Protection system	Protection functions	Input/output fuse-free protection, electronic detection of overcurrent, overvoltage, overload, overheat and short-circuit, and automatic disconnection and alarm
	Protection method	Output cut off
Operating environment	Ambient temperature	-10℃ to 45℃
	Relative humidity	0–90%
	Altitude	≤2000m
		If altitude exceeds rated value, derating is required.

Main Components

Control Module

Control Panel

Applications

Import & Export Equipment

Used in testing and simulation setups for imported or exported devices, to allow smooth frequency conversion to match different regional power standards.
Industrial Manufacturing
Used for pre-shipment testing and performance verification of motors or other electrical equipment before delivery.
Medical Equipment
To imulate the voltage and frequency conditions required by medical systems to ensure stable and accurate power supply.
Certification & Testing
Provides adjustable power sources for certification labs to replicate specific or abnormal voltage conditions during equipment evaluation.
Scientific Research & Testing
Used to simulate specific voltage and frequency conditions for precision instruments and environmental testing in laboratories or research facilities.
Special Applications
Designed for places requiring stable voltage and frequency conversion, such as ships, shipbuilding facilities, offshore drilling platforms, ports, and docks.

Founded in 1995, Shanghai Wenlida develops and manufactures advanced voltage regulation and power quality equipment designed to maintain stable grid voltage levels, and ensure efficient and reliable operation of industrial and utility power systems.

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