26/08/2020
The home AC voltage standards and frequencies of different countries in the world are not the same. Most home appliance use two-phase AC power supply (two wires), and many industrial uses are three-phase AC power supply (three wires). The two-phase AC power used by households is roughly divided into two types. One is 220-240V/50Hz used in countries and regions such as China, Russia, Eastern Europe, the United Kingdom and the British Commonwealth. This voltage is higher and the transmission loss is lower, but the safety is lower. The other is the United States and Western Europe, Japan, Taiwan and other countries and regions use 100-120V/60Hz. This voltage is lower and the transmission loss is higher, but the safety is more safer. Normally we can not say which one is absolutely good or which one is bad, the two standards are just caused by different reasons in different periods.
The two standard electrical appliances cannot be used casually. Some electrical appliances can be used universally, such as digital chargers, new LCD TVs, computers, etc. These electrical appliances generally use a new type of switching power supply circuit that automatically adapts, and these electrical appliances can automatically adapt to 110V or 220V, this kind of electrical appliances does not need to distinguish which standard AC power is. Generally, the applicable voltage is marked as 100-240V on the electrical specification sheet. The frequency of the power supply has little to do with general electrical appliances and can be used.
However, some traditional electrical appliances with motors and heating appliances cannot be used with two voltages, such as rice cookers, fans, ovens, electric heaters, refrigerators, washing machines, etc. If 110V electrical appliances use 220V power supply, it may be Due to excessive current damage and have safety risks, if a 220V electrical appliance is powered by 110V, it may not be able to achieve the performance of the electrical appliance. For example, the fan rotates slowly, the heater is not hot enough, and some appliances cannot even start normally.
For different voltages, user can also use an additional high-power power converter to convert the voltage, and then supply power to appliances of different voltages. For example, user can convert 220V AC to 110V AC, or convert 110V AC to 220V AC , But the AC frequency is generally not converted, it is not relevant and generally can be used. When choosing a portable power station in different countries, please pay attention to whether the corresponding output voltage is 220V or 110V.
The following is the voltage and frequency of home AC power supply used in some major countries and regions in the world, 220-240V AC power supply are more popular.