source:power supply Popular:adapter release time:2021-07-24 13:54:36 Article author:sznbone
What are the modulation methods of switching power supply?
⑴ Pulse width modulation type, referred to as PWM, namely pulse width modulation. Its characteristic switch cycle is a constant value, and the duty cycle is changed by adjusting the pulse width to achieve the purpose of voltage stabilization. Its core PWM controller. The application of pulse width modulation switching power supply is the most common, and its duty cycle adjustment range is large, and PWM can also be synchronized with the clock of the main system.
⑵Pulse frequency modulation, referred to as PFM, namely pulse frequency modulation. Its characteristic is that the pulse width is a constant value, and the duty cycle is changed by adjusting the switching frequency to achieve the purpose of voltage stabilization. Its core is the PFM controller. Pulse frequency modulation switching power supply is particularly suitable for portable equipment, it can reduce the quiescent current of the control chip under the conditions of low duty cycle and low frequency.
⑶ Pulse density modulation, referred to as PDM, namely pulse density modulation. Its characteristic is that the pulse width is a constant value, and the purpose of voltage stabilization can be achieved by adjusting the number of pulses. It adopts zero-voltage technology, which can significantly reduce the loss of power switch tubes.
⑷Mixed modulation type. It is a combination of ⑴ and ⑵. The switching period and pulse width are not fixed and can be adjusted. It contains PWM controller and PFM controller.
The above four working modes are collectively referred to as "time ratio control" (TRC) mode, among which the PWM controller is the most widely used. It should be pointed out that the PWM controller can be used as an independent integrated circuit, and can also be integrated in a switching regulator or a monolithic switching power supply. Among them, the switching regulator is a DC/DC converter, and the switching power supply is generally an AC/DC converter.
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