What is the concept of switching power supply in electronic circuit single chip microcomputer? What's the use of industry? What is the working principle? Must adopt
According to the connection mode of switching devices in the circuit, the switching power supply, which is widely used at present, can be divided into three major categories: series switching power supply, parallel switching power supply and transformer type switching power supply. Among them, the switching power supply transformer (hereinafter referred to as the transformer switching power supply) can be further divided into: push-pull, half bridge, full bridge etc; according to the phase excitation and the output voltage of the transformer, and can be divided into: forward, flyback, single and double excitation type excitation type variety; if from the use of come, also can be divided into more types.
Because of the high power factor of the switching power supply and less impact on the power grid (without power factor compensation), it is widely used.
Switching power supply generally has three modes of operation: frequency, pulse width, fixed mode, fixed frequency, variable pulse width mode, frequency, pulse width variable mode. The former mode of operation is mostly used for DC/AC inverter or DC/DC voltage conversion. The latter two modes are mostly used in switching power supply. In addition, the output voltage of switching power supply also has three operating modes: direct output voltage mode, average value, output voltage mode, amplitude output voltage mode. Similarly, the former mode of operation is mostly used for DC/AC inverter or DC/DC voltage conversion. The latter two modes are mostly used in switching power supply.
A variety of switching power supply, its working principle is not the same, but the fundamental principle are basically the same, namely: switching power supply is the use of electronic switching devices (such as transistor, FET, SCR thyristor, etc.) through the control circuit, the electronic switching devices constantly "on" and "off" so, the electronic switch on input voltage pulse modulation device, so as to realize DC/AC, DC/DC voltage, and output voltage adjustable automatic voltage regulator.
