Bare board power supply is a kind of power supply which uses modern power electronic technology to control the switch off ratio of bare board to keep the output voltage stable. Bare board power supply is generally composed of PWM control IC and MOSFET.
Bare board power supply is a kind of power supply which uses modern power electronic technology to control the time ratio of bare board switching transistor to keep the output voltage stable. Bare board power supply can be divided into AC / DC and DC / DC. According to whether there is electrical isolation between input and output, it can be divided into two categories: one is isolated DC / DC converter, the other is non isolated DC / DC converter. Bare board power supply has over-current, over heat, short circuit and other protection functions. Wide input voltage range, high input and output isolation voltage, high isolation input and output isolation voltage.
What is a transformer?
Transformer is a device that changes AC voltage by using the principle of electromagnetic induction. The main components are primary coil, secondary coil and transformer. The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic core), etc. According to the use can be divided into: power transformer and special transformer (magnetic saturation transformer). The circuit symbol is usually used as the beginning of the number t. For example: T01, t 201, etc.
Function difference between bare board power supply and transformer
1. The bare board power supply is DC power supply and the transformer is AC power supply
2. The frequency of bare board power supply is higher (generally in tens of kHz), the frequency of transformer is higher, and the frequency is lower. The pulse transformer for bare board power supply is high frequency transformer, and the iron core is ferrite and other magnetic core, which is small in size and high in efficiency (the higher the frequency, the higher the efficiency). It is said that people first think of power frequency transformer, whose working frequency is 50 Hz, which belongs to low frequency transformer. The iron core must be made of silicon steel sheet soft magnetic material (to prevent Joule heat caused by eddy current);
3. The functions of the two kinds of power supply are different. Bare board power supply has pulse transformer and upper and lower rectifying parts. No matter which frequency segment of the transformer has only voltage conversion, it has no rectifying function;
4. Bare board power supply: compared with traditional power supply, it has the characteristics of low power consumption, high efficiency, small volume, light weight, wide voltage range, etc. Widely used in computer and peripheral equipment, communication, automatic control, household appliances and other fields. However, the outstanding disadvantage of bare board power supply is the strong electromagnetic interference. The interference signal not only has a wide frequency range, but also has a certain amplitude. Through conduction and radiation, it will pollute the electromagnetic environment and interfere with communication equipment and electronic products. If not handled properly, the bare board power supply itself will become the interference source.
Traditional transformer power supply: the disadvantages are large volume and low efficiency, but in order to make profits, manufacturers in the market use inferior selenium steel plate or fake selenium sheet, resulting in overheating and low efficiency of transformer.
