Jinma variable frequency power supply converts the US grid’s 480V/60Hz into the 380V/50Hz that Chinese 3D printers are designed for — solving both voltage and frequency mismatch in one unit.
Using AC-DC-AC dual conversion, it regenerates a pure sine wave fully decoupled from the mains: ±1% voltage regulation, ±0.1Hz frequency accuracy, THD below 3%, and voltage recovery in under 20ms. DSP digital control, Infineon/Mitsubishi IGBTs, and custom LC filtering protect precision servo and laser systems.
Rated 480V ±10% input, IP54 (IP65 optional), and designed to meet US FCC EMC requirements, with full overvoltage, undervoltage, overcurrent, overtemperature, phase-loss, and short-circuit protection. From 10kVA to 500kVA, it covers desktop to metal 3D printers.
| Parameter | Specification |
| Input voltage | Three-phase 480V (440V/460V supported), wide-range tolerance 480V ±10% |
| Output voltage | 380V (custom settings available), regulation ±1% |
| Frequency | 60Hz input → 50Hz output, arbitrarily settable, ±0.1Hz |
| Output waveform | Pure sine wave, THD < 3% |
| Load transient recovery | < 20 ms |
| Capacity range | 10 kVA – 500 kVA |
| Enclosure protection | IP54 standard, IP65 optional |
| EMC | Built-in input/output filters, designed to meet US FCC EMC requirements |
| Protections | Overvoltage, undervoltage, overcurrent, overtemperature, phase loss, short circuit, fault self-diagnosis |
| Control | DSP digital control, frequency synthesis accuracy 0.01 Hz |
| Power devices | Infineon / Mitsubishi IGBTs, margin design for reliability |
| Factory test | 100% full-load 72-hour aging test before shipment |
Most US industrial grids supply three-phase 480V at 60Hz (440V and 460V are also seen in some regions), while 3D printers are designed for three-phase 380V at 50Hz. Connecting a 380V machine directly to a 480V grid causes damage on three fronts:
Frequency mismatch is equally destructive for high-end machines equipped with precision servo systems and high-speed galvanometer scanners:
Voltage mismatch burns equipment; frequency mismatch destroys precision. A power supply that converts both voltage and frequency is therefore not optional — it is the essential configuration for exporting 3D printers to the United States.
A step-down transformer corrects voltage only. It can protect a 380V printer from the 480V supply, but it cannot change frequency — and it is precisely the frequency mismatch that corrupts servo motion, scanning, and control clocks in modern 3D printers.
| Capability | Step-Down Transformer | Frequency Converter |
| Voltage conversion (480V → 380V) | Yes | Yes |
| Frequency conversion (60Hz → 50Hz) | No | Yes |
| Stable sine-wave output | No (mains-dependent) | Yes (THD < 3%) |
| Fast response to load changes | No | Yes (< 20 ms recovery) |
| Safe for servo/laser 3D printers | Risky | Yes |
A transformer corrects voltage only. If your printer relies on servo drives, galvanometer scanners, or laser/electron-beam sources, the 60Hz input still causes trajectory drift and forming defects. A frequency converter solves both voltage and frequency in one unit.
Yes. The AC-DC-AC conversion outputs a stable 380V/50Hz sine wave with ±1% voltage and ±0.1Hz frequency accuracy, backed by full protection against overvoltage, undervoltage, overcurrent, overtemperature, phase loss, and short circuit.
Check your printer’s rated input power and add margin for heating modules and startup surge. The 10–500kVA range covers desktop through industrial machines; our engineers can size the unit from your printer’s specifications.
