The difference is as follows:
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Characteristics of power frequency inverter:
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1, the power frequency inverter at low power, the cost is higher than the high frequency inverter.
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2, the weight and volume of the power frequency inverter are larger than the high-frequency inverter with the same power.
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3, the efficiency of power frequency inverter is lower than that of high frequency inverter, and the iron loss is basically unchanged when running under full load and light load, so the no-load loss of power frequency inverter running under light load is relatively large.
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4, the reliable performance of the power frequency inverter is higher than that of the high-frequency inverter, and it is not easy to break.
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5, the power frequency inverter with load capacity, especially the impact load capacity, is better than the high-frequency inverter, and can suppress the high-order harmonic components in the waveform.
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6, the power frequency inverter structure is relatively simple, overload and short circuit protection than high-frequency inverter is easy to produce.
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High frequency inverter first through high frequency DC\/DC conversion technology, the low voltage direct current inverter into high frequency low voltage alternating current; Then after the high frequency transformer boost, and then through the high frequency rectifier filter circuit rectifier into usually more than 300V high voltage direct current, and finally through the power frequency inverter circuit to get 220V power frequency alternating current for load use.
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Characteristics of high frequency inverter:
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1, the no-load loss of high-frequency inverter is very small, so the inverter efficiency is high.
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2, high-frequency inverter small size, light weight.
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3, the high-frequency inverter no-load is low, can not be connected to the inductive load of full load, and the overload capacity is relatively poor.
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Performance comparison of power frequency inverter and high frequency inverter:
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1, in terms of reliability, power frequency inverter is better than high frequency inverter
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Power frequency inverter using thyristor (SCR) rectifier, the technology after more than half a century of development and innovation, has been very mature, its current impact resistance is very strong. Because the SCR is a semi-controlled device, there will be no faults such as straight through and false triggering. In contrast, the IGBT high-frequency rectifier used in the high-frequency inverter has a higher switching frequency, but the IGBT has a strict voltage and current working area, and the impact resistance is low. Therefore, in terms of overall reliability, IGBT rectifiers are lower than SCR rectifiers.
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2, in terms of environmental adaptability, high-frequency inverters are better than power frequency inverters
1. The difference between high frequency inverters and power frequency inverters is that the size is different and the inverter is different.
2. The high frequency inverter first needs to boost the low voltage DC to about 300V, and then the DC high voltage of 300V is adjusted into 3000~5000 Hz pulsating DC, and then the inverter tube is processed to form square wave alternating current, and finally the sine wave drive version is adjusted into sine wave alternating current.
3. The fair inverter only needs to boost the low-voltage direct current and then modulate it into 50Hz alternating current.
4 Although the inverter process of the fair inverter is much simpler than that of the high-frequency inverter, the volume of the fair inverter is much larger than that of the high-frequency inverter, because it is inconvenient to carry and difficult to maintain later, so most of them use the high-frequency inverter.
The difference is as follows
The power frequency inverter is not as efficient as the high frequency inverter, because the complex hardware analog circuit is burned in the microprocessor, and the operation of the inverter is controlled by the program. In addition to the large size reduction of the high-frequency inverter, its conversion efficiency has also been improved.
First, the power frequency machine is designed based on the traditional analog circuit principle, the internal power devices of the machine (such as transformers, inductors, capacitors, etc.) are larger, generally there is less noise when the load is larger, and the resistance performance is strong in the harsh grid environmental conditions, the surge resistance far high frequency machine is incomparable, and the reliability and stability are stronger than the high frequency machine. The high frequency machine is based on the microprocessor (CPU chip) as the processing control center, is the complex hardware analog circuit burned in the microprocessor, in the way of software program to control the UPS or inverter;
Second, from the equipment design volume difference, the inverter frequency machine is much larger than the high-frequency machine, the weight is much larger than the high-frequency machine, because the above mentioned equipment internal components, transformers, inductors, capacitors are larger.
Third, the conversion efficiency, the power frequency machine is not as high as the high-frequency machine conversion efficiency.