The SPX customized DC VFD Frequency Converter abandons the traditional rectifier unit in the front end of the frequency converter and directly communicates with the DC bus, efficiently translating stable DC power into adjustable AC power required by the motor in one step. In the era of energy structure evolving towards distributed and direct current, the native direct current generated by photovoltaic arrays, battery energy storage, fuel cells, etc. often needs to undergo multiple inefficient "AC-DC-AC" conversions when supplying AC loads. This is not only a simplification of components, but also a leap in system energy efficiency and an innovation in architecture.
By eliminating the input rectification and power factor correction circuits of traditional frequency converters, the energy conversion process is reduced, and the overall efficiency of the system is generally improved by 2% -5%, especially under partial loads where the advantages are more obvious.
Simplified topology structure, with volume and weight typically smaller than AC input frequency converters of the same specifications at the same power level. Wholesale DC VFD Frequency Converter is more conducive to integrated installation in DC cabinets with limited space.
Designed to adapt to common DC voltage levels such as 200-400Vdc, 500-800VDC, etc., it can be directly connected to photovoltaic strings, battery packs, or DC distribution busbars.
When the motor is in the power generation state (such as when heavy objects are lowered or equipment stops urgently), it can efficiently feedback the regenerated energy to the DC bus for use by other loads or stored in the battery, achieving internal circulation and maximum utilization of energy in the DC network.
Due to being powered entirely from the DC bus, the high quality DC VFD Frequency Converter operates without being affected by voltage fluctuations, frequency flicker, or harmonic pollution from the AC power grid, providing extremely pure and stable power to the motor, making it particularly suitable for precision equipment with extremely high requirements for power quality.
In DC microgrids, it is easier to selectively protect and cooperate with upstream DC circuit breakers and fuses, simplifying the system protection architecture.
DC input positive and negative busbars → DC support capacitor → intelligent inverter unit (based on IGBT/SiC) → filtered output of three-phase AC power to the motor. Compared to traditional frequency converters: AC input → rectifier bridge → DC bus capacitor → inverter bridge → output.
Directly connect photovoltaic DC combiner boxes or energy storage batteries to drive loads such as water pumps and fans, and build efficient off grid or grid connected systems.
The DC VFD Frequency Converter is used for the electric drive test bench of electric vehicles, which directly simulates battery output using a DC power supply to test the performance of the motor controller.
In ships, data centers, and semiconductor factories that use 380V or higher voltage DC busbars, DC VFD Frequency Converter supplies power to various auxiliary power equipment (air compressors, cooling pumps).
In the DC power system of mining trucks and electric engineering machinery, hydraulic pumps, fans and other equipment are driven.
| Frequency converter model | Power supply capacity(KVA) | input current A | output A | Adaptation motor | |
| KW | HP | ||||
| 3 Phase 380V(-10%~+15),50/60Hz | |||||
| SP9000-4T0015G | 3.0 | 5 | 3.8 | 1.5 | 2 |
| SP9000-4T0022G | 4.0 | 5.8 | 5.1 | 2.2 | 3 |
| SP9000-4T0030G | 5.0 | 8.0 | 7.2 | 3.0 | 4 |
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