A switching power supply is an electronic device that converts electrical energy into a specific output voltage, current or power. It is widely used in electronic equipment, communication equipment, computers, industrial automation, medical equipment and other fields by converting the electrical energy from the input power supply into high efficiency output electrical energy.
Working Principle of Switching Power Supply
The working principle of switching power supply is to control the conduction and disconnection of switching tubes, so as to make the electrical energy of the input power supply to be converted into the output electrical energy in a high-efficiency way. Specifically, the working principle of switching power supply can be divided into the following steps:
1. The AC voltage of the input power supply is converted into DC voltage through rectifier circuit;
2. The DC voltage passes through the filtering circuit to remove the impurity;
3. The DC voltage passes through the switching tubes for the switching control;
4. The conduction and breakage of the switching tubes control the size and waveform of the output voltage;
5. The switching tubes control the size and waveform of the output voltage;
6. magnitude and waveform;
5. The output voltage is transmitted to the load through the output circuit.
Application Scenarios of Switching Power Supplies
Switching power supplies are widely used in a variety of electronic equipment, communication equipment, computers, industrial automation, medical equipment and other fields. Its main application scenarios include:
1. Electronic equipment: such as televisions, stereos, DVDs, etc.;
2. Communication equipment: such as cell phones, routers, switches, etc.
3. Computers: such as desktop computers, laptops, etc.
4. Industrial automation: such as industrial controllers, PLCs, etc.
5. Medical equipment: such as Medical power supply, medical equipment, etc.
Analysis of the advantages and disadvantages of switching power supply
Switching power supply has the following advantages over the traditional linear power supply:
1. High efficiency: the conversion efficiency of switching power supply is usually more than 80%, while the efficiency of the linear power supply is only about 50%;
2. Small size: switching power supply is usually a lot smaller than the size of linear power supply, which can save space;
3. Light weight: the weight of switching power supply is usually much lighter than linear power supply, it can be convenient to carry;
4. Stability: the output voltage of switching power supply is stable, and is not easily affected by the fluctuation of input voltage.
But there are some disadvantages of switching power supply:
1. Electromagnetic interference: switching power supply in the work will produce electromagnetic interference, may affect other electronic equipment;
2. High cost: switching power supply manufacturing cost is higher than the linear power supply, the price is relatively expensive;
3. Involved in the design of high-frequency circuits: switching power supply design Need to involve high-frequency circuit design, the technical requirements of the designers are higher.