Working principle of switching power supply workin

2022-07-22
  • Detail

Everyone is familiar with switching power supply, which is widely used and has the advantages of stable and reliable voltage, low power consumption and high conversion efficiency. Therefore, switching power supply is mostly used in TV equipment, such as optical amplifier, digital satellite receiver, modulator and other equipment. Next, I will introduce the working principle and mode of switching power supply

everyone is familiar with switching power supply, which is widely used and has the advantages of stable and reliable voltage, low power consumption and high conversion efficiency. Therefore, switching power supply is mostly used in TV equipment, such as optical amplifier, digital satellite receiver, modulator and other equipment. Next, I will introduce the working principle and mode of switching power supply

working principle of switching power supply

switching power supply can make the power transistor work in two working states: on and off. In fact, it is realized by chopping the amplitude of input DC voltage into a pulse voltage equal to the amplitude of input voltage. Its working principle is that the volt ampere product added to the power transistor is very small (in the on state, the voltage is low and the current is large; in the off state, the voltage is high and the current is small), that is, the loss generated on the power transistor is very small

switching power supply working mode

1, frequency, pulse width fixed mode, this mode is mainly used for dc/ac inverter power supply, or dc/dc voltage conversion

2, fixed frequency, variable pulse width mode, mainly used for switching regulated power supply

3. Variable frequency and pulse width mode, mainly used for switching regulated power supply

composition of switching power supply

1. Main circuit

impulse current limiting: limit the impulse current at the input side at the moment of power on

input filter: it filters the clutter existing in the power grid and prevents the clutter generated by the machine from being fed back to the power grid

rectification and filtering: the AC power supply of the power grid is directly rectified into smoother DC

inverter: convert the rectified DC into high-frequency AC, which is the core of high-frequency switching power supply

output rectification and filtering: provide stable and reliable DC power supply according to load demand

2. The control circuit

samples from the output end, compares it with the set value, and then controls the inverter to change its pulse width or pulse frequency to stabilize the output; According to the data provided by the test circuit, after the identification of the protection circuit, the control circuit is provided to carry out various protection measures for the power supply

3. Detection circuit

provides various parameters and instrument data of the protection circuit in operation

4. Auxiliary power supply

realizes the power supply software (remote) startup, protection circuit and control circuit work power supply

editor's summary: the working principle and mode of switching power supply are introduced here. I hope it will be helpful to you. If you want to know more about it, you can pay attention to the information

南京男科医院

沈阳银屑病医院

贵阳癫痫医院

Copyright © 2011 JIN SHI