Power frequency generally refers to the frequency of mains power, which is 50Hz in our country. The power frequency transformer can change the voltage of alternating current at this frequency.

Design principle:

1. Reducing the amount of copper can be achieved in two ways. One is to reduce the diameter of the cable, which means that the resistance of copper increases and copper loss will also increase. The other is to reduce the number of turns, which will increase the no-load current and the no-load loss. If the transformer is in a power-on standby state for a long time, the waste of energy will be very large. Our country wastes billions of yuan in electricity every year because electrical appliances remain in standby mode for long periods of time.

2. When designing the transformer, the copper loss and iron loss should be equal, so that the transformer has the lowest loss and the most stable operation. If a transformer is designed, smaller wire diameters and fewer turns are used to save copper wire. There is also a lot of space left inside the core window, which means the core is oversized and the core is wasted. Due to the larger core size, the average circumference of the windings is also larger, which also increases the amount of copper wire used. From a price point of view, the cost of the iron core is higher than the cost of the copper wire.

Therefore, when designing, while ensuring that the performance meets customer requirements, you should try to choose a smaller iron core. If you can use 41, never use 48. Regarding the no-load current, from the perspective of saving standby losses, try to Low is good.