MICRO USB socket simple on the switching power supply features introduced
MICRO USB Socket Introduction Switching power supply include input power grid filter, input rectifier filter, inverter, output rectifier filter, control circuit, protection circuit of their functions are described below.
1, Input grid filter: Eliminate the interference from the grid, such as the start of the motor, the electrical on / off, lightning strikes and other interference, but also to prevent high-frequency noise generated by the switching power supply to the grid proliferation.
2, the input rectifier filter: input voltage rectification filter for the converter to provide DC voltage.
3, Inverter: It is the key part of the switching power supply, it changes the direct current voltage into the high-frequency alternating current: And, II and play the role of separating the output part from the input power grid.
4, the output rectifier filter: MICRO USB socket converter inverter output frequency AC voltage rectified filtered DC voltage required, 1? 1 to prevent high-frequency noise on the load interference.
5, the control circuit: DC voltage detection output, and compared with the reference voltage after amplification; modulation oscillator pulse width, thereby controlling the converter to maintain the stability of the output voltage.
6, the protection circuit: When the switching power supply over-voltage, over-current short circuit, the protection circuit to stop switching power supply It work to protect the load and the power itself.
Linear power supply is generally sampled with the output voltage and reference voltage into the comparison voltage amplifier, the output of the voltage amplifier as a voltage regulator tube input to control the regulator tube so that the junction voltage changes with the input changes, so as to adjust The output voltage. However, the switching power supply is to change the output voltage by changing the time (that is, the duty cycle) of adjusting the on / off of the tube.