When we develop the switching mode power supply technology which is the one related to the development of power electronic devices, while the development of switching frequency conversion technology, promote each other to promote the switch power supply with more than two year growth toward light digital, small, thin, low noise, high reliability and anti interference direction. The switching power supply can be divided into two categories: AC/DC and DC/DC types.
Switching mode power supplies is becoming popular and miniaturized. It will gradually replace all applications of transformers in life. The application of low power micro switch power supply should first be reflected in the digital display, smart meter, mobile phone charger and so on. At this stage, the state is vigorously promoting the construction of smart grid, and the demand for electric energy meters has been greatly improved. Switching power supply will gradually replace the application of transformer on the electric energy meter.
The difference between reverse type series switching power supply and switching power supply series is the inverted series voltage switching power supply output voltage is negative, just positive voltage and general series switching power output of opposite polarity; and because the inductor L shut off only in the switch K to the output current of the load, therefore, under the same conditions, reverse type series current switching power output than the series switching power supply output current one times.