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Issue Time:2020-04-27
Title:What are the modes of operation of switching power supply?

Meanwell switching power supply is the use of electronic switching device (e.g., field effect transistor, SCR thyratron, etc.), through the control circuit, the electronic switch devices constantly "on" and "off", make electronic switching device to pulse modulation of the input voltage, so as to realize the DC/AC, DC/DC voltage conversion, and output voltage harmonic voltage automatically.



Switching power supply generally has three working modes: frequency, pulse width fixed mode, frequency fixed, pulse width variable mode, frequency, pulse width variable mode. The former working mode is mainly used for DC/AC inverter power supply, or DC/DC voltage conversion; The latter two working modes are mostly used for switching voltage stabilized power supply. In addition, the output voltage of switching power supply also has three working modes: direct output voltage mode, average output voltage mode, amplitude output voltage mode. Similarly, the former working mode is mostly used for DC/AC inverter power supply, or DC/DC voltage transformation; The latter two working modes are mostly used for switching voltage stabilized power supply.

According to the mode of connection of switching devices in the circuit, switching power supply can be generally divided into three categories: serial switching power supply, parallel switching power supply, transformer switching power supply and so on. Among them, transformer-type switching power supply (hereinafter referred to as transformer switching power supply) can be further divided into: push-pull type, half-bridge type, full-bridge type, etc. According to the excitation of the transformer and the phase of the output voltage, it can be divided into: positive excitation type, counter excitation type, single excitation type and double excitation type. If divided by use, it can be divided into more categories.

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