DCDC converter working principle: DC-DC converter is a repeated on-off switch, the DC voltage or current into high-frequency square wave voltage or current, and then smoothly into DC voltage output by rectification.
DC-DC converters are generally composed of control chips, inductor coils, diodes, transistors, and capacitors. DC/DC converters are voltage converters that effectively output a fixed voltage after converting the input voltage. There are three categories of DC/DC converters: step-up DC/DC converters, step-down DC/DC converters, and buck-boost DC/DC converters. Three types of control can be used depending on the requirements. PWM-controlled type has high efficiency and good output voltage ripple and noise. The PFM-controlled type has the advantage of low power consumption, especially when it is used for a long time, especially when it is small. The PWM/PFM conversion type performs PFM control at small loads, and automatically switches to PWM control at heavy loads. At present, DC-DC converters are widely used in mobile phones, MP3, digital cameras, portable media players and other products. It belongs to the chopper circuit in the classification of circuit type.
