Switching power supply is a kind of power supply equipment that converts alternating current into stable direct current. Its working principle is to control the voltage and current of the input power supply through continuous switching of the switch tube, so as to achieve the stability of the output voltage and current. Switching power supply is widely used in various electronic equipment, such as computers, communication equipment, household appliances, etc. because of its high efficiency, stability, reliability and other characteristics.
The basic composition of switching power supply includes input filter L7809CV , rectifier circuit, power switch tube, output filter, feedback circuit and control circuit, etc. Among them, the input filter is used to filter out high-frequency noise and interference signals in the input power supply, the rectifier circuit converts alternating current into direct current, the power switch tube is the key component to control the power supply output, the output filter is used to filter out high-frequency noise and ripple in the output power supply, and the feedback circuit is used to monitor the output voltage and current, The switching frequency and duty cycle of the power switch are adjusted by the control circuit to achieve the stability of the output voltage and current.
The characteristics of switching power supply mainly include the following aspects:
1. High efficiency: the efficiency of switching power supply is more than 90%, far higher than the traditional linear power supply, which can greatly reduce energy waste and improve energy utilization.
2. Stability: the switching power supply can monitor the output voltage and current in real time through the feedback circuit, and adjust the switching frequency and duty cycle of the power switch through the control circuit to stabilize the output voltage and current within the set value range.
3. Reliable: The switching power supply has a simple circuit structure and a long service life. Due to its digital control technology, it can achieve automatic protection functions, such as over-current protection, over-voltage protection, overtemperature protection, etc., greatly improving the reliability and safety of the power supply.
4. Small size: The switching power supply adopts high-frequency switching technology, which greatly reduces its size and is suitable for the application of various small electronic devices.
5. Light weight: The switching power supply uses a large number of electronic components, making it light in weight and convenient to carry and use.
The development direction of switching power supply mainly includes the following aspects:
1. High efficiency: With the social emphasis on energy and the improvement of environmental awareness, the high efficiency of switching power supply has become an important direction of development. In the future, switching power supply will adopt more advanced power semiconductor devices, efficient inductance and capacitance components, and digital control technology to achieve higher conversion efficiency.
2. Integration: With the continuous development of electronic equipment and the improvement of intelligent level, the requirements for the integration of switching power supply are becoming higher and higher. In the future, the switching power supply will adopt a more compact and integrated design to meet the needs of various small and lightweight electronic devices.
3. Multi functionality: The future switching power supply will not only be a simple power supply device, but also an intelligent system with multiple functions, such as battery management, power control, data transmission, etc., to meet the needs of different users.
4. Safety: The safety of switching power supply has always been the focus of attention. In the future, switching power supply will adopt more advanced digital control technology and automatic protection function to improve its safety and reliability.
5. Greenization: The future switching power supply will pay more attention to environmental protection and sustainable development, and adopt more environmentally friendly materials and processes to reduce the impact on the environment.
