Which is better, power frequency inverter or high-frequency inverter?

RVs are mobile houses, and household appliances are indispensable. RVs generally have two power systems, one is a DC system, which can use low-power appliances mainly 5V 12V 24V; the other is an AC system, which can use almost all household appliances like at home even when off-grid. Therefore, inverters have become a necessary equipment for RVs.

Inverters, also known as converters and inverters, are converters that convert DC into AC. When choosing an inverter, you should first pay attention to its type. AC is different from DC. Its current direction changes periodically over time and propagates in waveforms. According to waveform classification, there are two main types, one is a modified sine wave inverter and the other is a pure sine wave inverter.

Most electrical appliances can use modified sine wave inverters normally, such as light bulbs, appliances with compressors, and power tools. But appliances such as electric blankets and coffee machines cannot work properly because their microprocessors require pure sine waves to correctly adjust the temperature, and for appliances such as televisions, they will also produce "buzzing" noises.

The output waveform of a pure sine wave inverter is almost the same as that of the mains, and household appliances can basically work normally without any restrictions. ·

Therefore, for RV inverters, of course, pure sine wave inverters should be the first choice, without any dispute. Knowing that pure sine wave inverters are the first choice is actually not enough, because they are also subdivided into two types: power frequency inverters and high-frequency inverters, which are quite different and applicable to different scenarios. The following is a comparison of the main indicators of two inverters of the same manufacturer and the same power to see if you have chosen the right one?

Comparison 1: Weight and volume.

Whether it is weight or volume, the power frequency inverter has a bulky problem due to the large internal components (such as transformers, inductors, capacitors, etc.), and is larger in volume than the high-frequency inverter of the same power. Therefore, in terms of weight and volume, high-frequency inverters are better than power frequency inverters (high-frequency inverters > power frequency inverters).

Comparison 2: No-load loss.

In the standby state without load, the no-load power of a 3000W high-frequency inverter is generally around 10W, while the no-load power of a 3000W industrial frequency inverter is generally around 20W or even higher. The no-load power of some 3000W industrial frequency inverters can be as high as 100W or more. Therefore, in terms of no-load loss, high-frequency inverters are better than industrial frequency inverters (high-frequency inverters > industrial frequency inverters).

Comparison 3: Inversion efficiency.

The no-load loss of high-frequency inverters is relatively small, and the inverter efficiency is relatively high. The no-load loss of industrial frequency inverters is relatively large, and the inverter efficiency is relatively low. Therefore, in terms of inverter efficiency, high-frequency inverters are better than industrial frequency inverters (high-frequency inverters > industrial frequency inverters).

Comparison 4: Heat and noise.

Large no-load loss means large heat generation; large heat generation means that the fan needs to speed up to cool down, and the noise will increase accordingly. Therefore, in terms of heat generation and noise, high-frequency inverters are better than industrial frequency inverters (high-frequency inverters > industrial frequency inverters)

Comparison 5: Environmental adaptation.

High-frequency inverters use microprocessors as processing and control centers, burn complex hardware simulation circuits into microprocessors, and control equipment operation in the form of software programs. They have obvious reductions in volume and weight, and have less noise. They have little impact on space and environment, and are more suitable for places where reliability requirements are not too stringent. Therefore, in terms of environmental adaptability, high-frequency inverters are better than industrial frequency inverters (high-frequency inverters > industrial frequency inverters)

Comparison 6: Load capacity.

Industrial frequency inverters have strong resistance to impact loads, and overload and short-circuit protection are easier to make than high-frequency inverters. However, high-frequency inverters have low no-load loads, cannot connect fully loaded inductive load electrical equipment, and have relatively poor overload capacity. Therefore, in terms of load capacity, industrial frequency inverters are better than high-frequency inverters (high-frequency inverters > industrial frequency inverters)

Comparison 7: Reliability.

The power frequency inverter uses a thyristor (SCR) rectifier. After more than half a century of development and innovation, this technology has become very mature. It will not have faults such as direct-through and false triggering. It has a very strong ability to resist current shock and is not easy to break. The high-frequency rectifier (IGBT) used by the high-frequency inverter has a strict voltage and current working area when working, and its impact resistance is weak. Therefore, in terms of reliability, the power frequency inverter is better than the high-frequency inverter (power frequency inverter> high-frequency inverter).

Which one is better, the power frequency inverter or the high-frequency inverter? Existence is reasonable, each has its own advantages and disadvantages, and there is no distinction between "who is better and who is worse", but the application scenarios are different. When choosing, we need to decide according to our actual needs and usage scenarios.

For example: If the power consumption is below 3000W, you can choose either one, and there is not much difference. If the installation space is limited, choose a pure sine wave high-frequency inverter. If the installation space is sufficient and the durability of the equipment is considered, choose a pure sine wave power frequency inverter, and so on. If there is a greater power demand of more than 3000W, the pure sine wave industrial frequency inverter is currently the only choice.

Comparison Item Industrial Frequency Inverter High Frequency Inverter
1.Weight & Volume large★ Small★★★
2.No-load Loss large★ Small★★★
3.inversion Efficiency low★ High★★★
4.Heat & NoISE  large★ Small★★★
5.Environmental Adaptability poor★ GOOD ★★★
6.Load Capacity  Strong★★★ Weak★
7.Reliability Strong★★★ Weak★

 

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