Jinma 220/380 series is a single-phase input three-phase output frequency-converter power supply or VFD. It receives 220V/50Hz from the mains and provides three-phase 380V with adjustable speed and frequency from 0 to 400Hz (for three-phase industrial equipments to operate with single-phase power connection without installing a three-phase power line).
Working Principle: AC–DC–AC Conversion:
| Three-phase motor power | Recommended Jinma model | Estimated single-phase input current | Typical applications |
| 0.75 – 1.5 kW | VFD-220/380-2.2kW | 7 – 15 A | Small drill presses, grinders, water pumps |
| 2.2 – 4 kW | VFD-220/380-5.5kW | 15 – 25 A | Air compressors, medium fans, woodworking machines |
| 5.5 – 7.5 kW | VFD-220/380-11kW | 25 – 35 A | Hydraulic presses, conveyors, large pumps |
| 11 – 15 kW | VFD-220/380-18.5kW | 40 – 60 A | Needs a dedicated high-current single-phase line (e.g., C63 breaker) |
Important: for machines above 11kW, verify the incoming single-phase capacity (meter, wiring, breaker) first — the drive is only part of the system. Jinma also offers custom higher-power configurations.
Correct sizing decides whether the application works. Three steps:
Before choosing a solution, it helps to understand the problem. Three factors block a direct connection:a
Before VFDs became practical and affordable, four approaches were common — each with real drawbacks:
| Method | How it works | Main limitations |
| Single-phase-in / three-phase-out VFD | Rectifies 220V AC to DC, then inverts DC to three-phase AC | The modern, recommended approach; note the drive’s effect on motor behavior (low-speed torque, harmonics) |
| Capacitor phase-splitting | A parallel capacitor creates a shifted phase to mimic three-phase | Only practical for small motors under about 1.5kW; non-standard output, low torque and efficiency, risk of motor damage |
| Rotary phase converter | A single-phase motor spins a three-phase generator | Heavy, noisy, inefficient, poor output waveform, high maintenance — largely obsolete |
| Replacing the motor | Swap the three-phase motor for a single-phase one | Expensive; few high-power single-phase options; high starting current; existing equipment may not be compatible |
For applications that need reliable, stable three-phase power, a single-phase-input VFD — also called a single-to-three-phase VFD or frequency-converter power supply — is the most practical and widely adopted solution today.
Yes. A single-phase-input / three-phase-output VFD is designed exactly for this: it converts 220V single-phase mains into standard three-phase 380V. The Jinma series covers motors from 0.75kW up to 15kW, with larger sizes available on request.
For a typical 4kW motor, input current is around 8A — usually fine on a standard residential circuit, but check the breaker, socket, and meter rating. Soft start also prevents inrush current from tripping the line.
Overcurrent, overvoltage, undervoltage, overheating, short-circuit, and phase-loss protection, plus soft start — protecting both the drive and the downstream motor.
Yes. The drive outputs genuine three-phase 380V and can supply precision instruments, test benches, and small production lines that require three-phase power.
