What is the operating mode of the switching power supply? What are the characteristics?

by:MOSO     2020-02-16
As the name implies, switching power supply is the use of electronic switching devices ( Such as transistor, field effect transistor, Silicon controlled thyristor, etc) , Through the control circuit, the electronic switching device is kept'Connect'And'Shutdown' , Let the electronic switching device pulse modulate the input voltage, thus realizing DC/AC, DC/DC voltage conversion, and adjustable output voltage and automatic voltage stabilization. Working mode switching power supply generally has three working modes: fixed frequency and pulse width mode, fixed frequency and variable pulse width mode, and variable frequency and pulse width mode. The former working mode is mostly used for DC/AC inverter power supply or DC/DC voltage conversion; The latter two working modes are mostly used for switching regulated power supply. In addition, the switching power supply output voltage also has three working modes: direct output voltage mode, average output voltage mode and amplitude output voltage mode. Similarly, the former working mode is mostly used for DC/AC inverter power supply, or DC/DC voltage conversion; The latter two working modes are mostly used for switching regulated power supply. According to the connection mode of switching devices in the circuit, switching power supply can be generally divided into three categories: Series switching power supply, parallel switching power supply and transformer switching power supply. Among them, transformer type switching power supply (Hereinafter referred to as the transformer switching power supply) It can also be further divided into: push-pull, half-bridge, full-bridge, etc; According to the excitation of the transformer and the phase of the output voltage, it can be divided into: forward excitation, Flyback, single excitation and double excitation, etc; If it is divided from the use, it can also be divided into more categories. Main features 1. Small volume and light weight: since there is no power frequency transformer, the volume and weight are only 20 ~ of the linear power supply ~ 30%. 2. Low power consumption and high efficiency: the power transistor works in the switching state, so the power consumption on the transistor is small and the conversion efficiency is high, generally 60 ~ 70%, while the linear electric power supply is only 30 ~ 40%.
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