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Power supply working mode


As the name suggests, switching power supply is the use of electronic switching devices (such as transistors, FET, SCR thyristor, etc.)
Switching power supply and circuit diagram
Switching power supply and circuit diagram
Through the control circuit, so that electronic switching devices constantly "on" and "off", so that electronic switching devices on the input voltage pulse modulation, in order to achieve DC / AC, DC / DC voltage conversion, and the output voltage adjustable and automatic Regulator. [1]
Switching power supply generally has three operating modes: frequency, pulse width fixed mode, frequency fixed, pulse width variable mode, frequency, pulse width variable mode. The former operating mode is mostly used for DC / AC inverter power supply, or DC / DC voltage conversion; the latter two operating modes for switching power supply. In addition, the switching power supply output voltage also has three kinds of work: direct output voltage mode, the average output voltage mode, amplitude output voltage mode. Similarly, the former work for a DC / AC inverter power supply, or DC / DC voltage conversion; the latter two kinds of work for switching power supply.
According to the switching device in the circuit connected to the way, switching power supply, can be divided into: series switching power supply, parallel switching power supply, transformer switching power supply and other three categories. Among them, the transformer-type switching power supply (hereinafter referred to as transformer switching power supply) can be further divided into: push-pull, half-bridge, full bridge and other; according to the transformer excitation and output voltage phase, and can be divided into: , Flyback, single-and double-excited and other kinds; if from the use of points, can also be divided into more types.
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