Basic composition and classification of switching power supply circuits
All kinds of things have rules, and different types of switching power supplies generally have the same place on the circuit. Some of the circuits of some types of switching power supplies have been mentioned in the Minrong small class before, but what is the basic composition of the switching power supply circuit? The following small class will talk about this point and share some classifications of switching power supplies.
1. Basic composition
The switching power supply is composed of main circuit, control circuit, detection circuit and auxiliary power supply.
1. Main circuit
Inrush current limit: limit the inrush current on the input side when power on. Input filter: Its function is to filter the clutter existing in the grid and prevent the clutter generated by the machine from feeding back to the grid. Rectification and filtering: The AC power of the grid is directly rectified into a smoother DC. Inverter: convert the rectified direct current into high frequency alternating current, 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. Minrong switching power supply spends a lot of energy on the main circuit. It can be said that Minrong switching power supply has the advantages of high efficiency, high safety, and low loss. These are inseparable from the contribution of the main circuit. Similarly, the high-quality main circuit of Minrong switching power supply is inseparable from the support of Minrong Electric's deep technology.
2. Control circuit
On the one hand, samples are taken from the output and compared with the set value, and then the inverter is controlled to change its pulse width or pulse frequency to stabilize the output. On the other hand, according to the data provided by the test circuit and identified by the protection circuit, a control circuit is provided to protect the power supply and take respective measures.
3. Detection circuit
Various parameters and instrument data in operation are provided in the protection circuit.
4. Auxiliary power supply
Realize the software (remote) start of the power supply, and supply power to the protection circuit and control circuit (PWM and other chips).
2. Main categories
In the field of switching power supply technology, people are developing related power electronic devices, such as 320W single group switching power supply.
While developing switching frequency conversion technology, both products and technologies promote each other, promoting the development of switching power supplies in the direction of light, small, thin, low noise, high reliability, and anti-interference, with an annual growth rate of more than double digits. Switching power supplies can be divided into two categories: AC/DC and DC/DC.
Small Low Power Switching Power Supply
Switching power supply is developing towards miniaturization and popularization. Switching power supplies will gradually replace transformers in many applications in life. The application of low-power micro-switching power supply must first be reflected in digital display meters, smart meters, mobile phone chargers, etc. At this stage, the country is vigorously promoting the construction of smart grids, and the requirements for electric energy meters have also been greatly improved. Switching power supplies will gradually replace the application of transformers in energy meters. Some types and models of Minrong Electric switching power supply have been developing in this direction. Minrong switching power supply is not only famous for its low loss, but also has the characteristics of high efficiency, safety, convenience and wide application. Its practicability in electric energy meters is very strong, and the giant position of Minrong switching power supply in the market has become more and more stable.
Inverted Series Switching Power Supply
The difference between the reverse series switching power supply and the general series switching power supply is that the output voltage of the reverse series switching power supply is negative voltage, which is exactly opposite to the positive voltage polarity 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 the output current of the series switching power supply.
