What is the difference between 3 phase power supply and 4 phase power supply?

First of all, take the three-phase power supply to illustrate, the advantage of the three-phase power supply is to use three groups of switching power supplies to take turns to share the task, which effectively reduces the load of each phase, can provide greater current, and can also effectively reduce the heat loss and improve the conversion efficiency.

Since more phases can provide more current, is it better to have more phases? First of all, let's rule out the different materials and the different parameters of each switching power supply. Generally speaking, one phase can provide about 30A 80A, three phases can provide about 90A 270A, and four phases can provide about 120A 320A.

This is a theoretical value, generally speaking, it can provide a theoretical value of three-phase power supply, and the CPU with a larger power consumption can also be supported by the motherboard, but in practice it cannot provide such a large current.

Let's take the Prescott core processor as an example, the CPU of this core requires much more current than the previous CPU of the Northwood core, so some motherboards cannot support the processor of this core. The reason is that in addition to the BIOS not being supported, the hardware is that the power supply part of the CPU does not meet the requirements. So to support the latest CPUs, it is necessary to meet the current requirements of the latest CPUs.

How to solve it? There are two methods, from the perspective of water flow, we can also consider it, one is to change the water pipe to a larger one; The second is to add another water pipe. That's why many of the motherboards that support Prescott on the market today have both three-phase and four-phase power.

Like Intel's 945 955 motherboards, most of them are three-phase or four-phase power supply due to the large CPU power consumption).

Secondly, we should also pay attention to the materials and design, that is to say, the motherboard with the right materials and design is actually better than the motherboard with poor materials and design. This is obvious, like saying that three water pipes carry a lot of water or four water pipes that carry a lot of water? To solve this problem, we must first see if the inner diameter of the two tubes is the same specification.

If it's the same size, it's four pipes that carry a lot of water, and if it's not, the result is different.

The four wires of the three-phase four-wire system are A, B, C, N, that is, three-phase electricity is also called power electricity, and the three phase lines of 380V A, Liangxi B, and C are three-phase plus a zero-respect car line N.

Power electricity, also known as three-phase electricity, is three live wires and a neutral line, the voltage between the zero line and each live wire is 220 volts, and between each two live wires is 380 volts.

Power electricity is mainly used in large machine tools, machinery, mixers, motors and other electricity, and now small processing including individual household processing households generally need power electricity.

The opposite of power electricity is lighting electricity, also called single-phase electricity, 220 volts, a live wire and a neutral line, which is a household circuit. It is used for electric lights, air conditioners, etc. It is worth reminding that household sockets are generally three-hole, and in addition to the neutral line of the live wire, there is also a ground wire.

Although this is also three wires, it is by no means power electricity.

If the line voltage is low, check whether the phase contact of the incoming line is good.

This is due to the open circuit of the zero line in the three-phase four-wire power supply line, under the ideal working state, if the three-phase load is evenly distributed, the current on the zero line is zero, but in the actual work, often the three-phase load can not be distributed very evenly, so there must be a zero line to keep the phase voltage of the three-phase balanced.

When the neutral line is disconnected, the phase voltage of the one-phase circuit with a large load will be very low. Therefore, in the three-phase four-wire power supply system, it is clearly stipulated that the neutral line shall not be connected to any switch, insurance, circuit breaker and other protection devices to prevent damage to electrical equipment due to the three-phase voltage imbalance caused by the disconnection of the neutral line.