Introduction to the basic composition and classification of switching power supply circuits
Basic composition
A switch power supply consists of a main circuit, a control circuit, a detection circuit, and an auxiliary power supply.
1. Main circuit
Surge current limitation: Limit the surge current on the input side when powered on. Input filter: Its function is to filter out the clutter present in the power grid and prevent the clutter generated by the machine from feedback back to the power grid. Rectification and filtering: The AC power supply of the power grid is directly rectified into smoother DC power. Inverter: converts rectified DC power into high-frequency AC power, which is the core part of high-frequency switching power supply. Output rectification and filtering: Provide stable and reliable DC power supply according to load requirements. The investment in the main circuit of the civilian switch power supply is particularly significant. It can be said that civilian switch power supplies have advantages such as high efficiency, high safety, and low loss, which cannot be separated from the contribution of the main circuit. Similarly, the high-quality main circuit of Minrong Switching Power Supply cannot be achieved without the support of Minrong Electric's profound technology.
2. Control circuit
On the one hand, samples are collected from the output end and compared with the set value, and then the inverter is controlled to change its pulse width or frequency to stabilize the output. On the other hand, based on the data provided by the testing circuit and identified by the protection circuit, control circuits are provided to protect the power supply and take respective measures.
3. Detection circuit
Provide various parameters and instrument data during operation in the protection circuit.
4. Auxiliary power supply
Implement software (remote) startup of power supply to supply power to protection circuits and control circuits (PWM chips, etc.).
Main classification
In the field of switching power supply technology, people are developing related power electronic devices, such as 320W single group switching power supplies.
While developing switch frequency conversion technology, products and technology mutually promote each other, driving the development of switch power supplies towards light, small, thin, low-noise, high reliability, and anti-interference directions, with an annual growth rate of over double digits. Switching power supplies can be divided into two categories: AC/DC and DC/DC.
Small low-power switching power supply
Switching power supplies are developing towards miniaturization and popularization. Switching power supplies will gradually replace transformers in many applications in daily life. The application of low-power micro switch power supplies should first be reflected in digital displays, smart meters, mobile phone chargers, and other aspects. At present, the country is vigorously promoting the construction of smart grids, and the requirements for energy meters have also been greatly improved. Switching power supplies will gradually replace transformers in the application of energy meters. Some types and models of Minrong Electric Switching Power Supply have been developing in this direction. Minrong Switching Power Supply is known for its low loss and high efficiency, safety, convenience, and wide applicability. It has strong practicality in energy meters, and the dominant position of civilian switch mode power supplies in the market is becoming increasingly stable.
Reverse series switching power supply
The difference between a reverse series switching power supply and a general series switching power supply is that the output voltage of the reverse series switching power supply is negative, and the polarity of the positive voltage is exactly opposite to that of the general series switching power supply. Since the energy storage inductor L only outputs current to the load when the switch K is turned off, under the same conditions, the output voltage of the reverse series switching power supply is negative, and the current is twice as small as that of the series switching power supply.
