source:Industry News Popular:adapter release time:2022-05-12 11:34:25 Article author:yu
The first, pulse width modulation
PWM is abbreviated as Pulse Width Modulation. Its characteristic switching cycle is a constant value, and the duty cycle is changed by adjusting the pulse width to achieve the purpose of voltage regulation. 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.
The second type, pulse frequency modulation
Referred to as PFM, that is, 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 regulation. At its core is the PFM controller. The pulse frequency modulated switching power supply is especially suitable for portable equipment, which can reduce the quiescent current of the control chip under the condition of low duty cycle and low frequency.
The third type, pulse density modulation
Abbreviated as PDM, which means pulse density modulation. Its characteristic is that the pulse width is a constant value, and the purpose of voltage regulation is achieved by adjusting the number of pulses. It adopts zero-voltage technology, which can significantly reduce the loss of the power switch tube.
Fourth, mixed modulation
It is a combination of the first and second ways. 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 for short) mode, among which 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 single-chip 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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